JP2015231490A - Angle adjuster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle adjuster that can prevent a second arm from rotating in a normally rotating direction to a first arm even when a load in the normally rotating direction is added accidentally to the second arm at a position of an arbitrary development angle of the second arm to the first arm.SOLUTION: A first arm 1 and a second arm 10 in an angle adjuster 60 are connected to each other so that the second arm 10 can rotate relatively to the first arm 1 around a rotary shaft part 13 in a state where a tightly-winding part 7 of a tightly-winding member 6 in the first arm 1 is wound around an outer periphery 13a of the rotary shaft part 13 in the second arm 10. The angle adjuster 60 comprises normal rotation prevention means 20 that includes a first pressing part 21, and prevents the second arm 10 from rotating in a normally rotating direction S when the first pressing part 21 presses the tightly-winding member 6 in a tightly winding direction V at a position of an arbitrary development angle of the second arm 10 to the first arm 1.

Description

  The present invention relates to an angle adjuster used for furniture and the like and a reclining chair provided with the angle adjuster.

  As furniture, for example, a reclining chair includes a seat frame, a back frame, and an angle adjuster. The seat frame and the back frame are connected to each other via an angle adjuster that adjusts the deployment angle of the back frame with respect to the seat frame. Various types of angle adjusters are known. For example, JP 2002-177082 (Patent Document 1), JP 2005-76735 (Patent Document 2), and JP 2006-230720 A. Those described in Japanese Patent Laid-Open No. 2006-340798 (Patent Document 4) and Japanese Patent Laid-Open No. 2010-88682 (Patent Document 5) are known.

  These angle adjusters have a first arm and a second arm, and the first arm and the second arm are connected so that the second arm can rotate relative to the first arm. Has been. A seat frame is attached to the first arm, and a back frame is attached to the second arm.

  These angle adjusters are configured so that the deployment angle of the second arm with respect to the first arm can be adjusted stepwise by utilizing the engagement between the gear teeth and the ratchet pawl. Therefore, the deployment angle of the second arm could not be adjusted steplessly, and fine angle adjustment according to the user's preference and the degree of fatigue could not be performed. Further, when the second arm is rotated in the forward rotation direction (for example, the rotation direction for decreasing the deployment angle of the second arm) in order to adjust the deployment angle of the second arm, a “click” sound is generated. There was a problem that it would be troublesome.

  The angle adjuster described in Japanese Patent No. 5232317 (Patent Document 6) is configured to be able to adjust the deployment angle of the second arm with respect to the first arm steplessly.

  As shown in FIGS. 15A and 15B, the angle adjuster 160 described in the publication includes a first arm 101 including a winding member 106 and a second arm 110 including a rotating shaft portion 113. . The rotation shaft portion 113 is provided on the second arm 110 so as to be integrally rotatable. When viewed from the axial direction of the rotary shaft 113, one end 106a and the other end 106b of both ends of the tightening member 106 are spaced apart from each other via the pivot pins 131 and 132, respectively. It is pivotally attached. Each pivot pin 131, 132 consists of a rivet. The first arm 101 and the second arm 110 are configured such that the second arm 110 is centered on the rotation shaft portion 113 in a state where the winding portion 107 of the winding member 106 is wound around the outer peripheral surface 113 a of the rotation shaft portion 113. It is connected so as to be rotatable relative to the arm 101.

  In the angle adjuster 160, as shown in FIG. 15A, when a load SK in the forward rotation direction S is applied to the second arm 110, the second arm 110 tries to rotate in the forward rotation direction S about the rotation shaft portion 113. And By such a rotation operation in the positive rotation direction S, the frictional force SM in the positive rotation direction S is applied to the contact portion 108 between the outer peripheral surface 113a of the rotation shaft portion 113 and the inner peripheral surface 107c of the tightening portion 107 of the winding member 106. Occur. The frictional force SM acts on the winding member 106 in the loosening direction U with respect to the outer peripheral surface 113a of the rotating shaft portion 113, so that the winding member 106 has both ends 106a, 106b fixed ends (more specifically, rotating ends). As a result, the inner diameter of the tightening portion 107 is slightly elastically deformed in the loosening direction U so as to increase. As a result, the tightening force of the tightening member 106 on the outer peripheral surface 113a of the rotating shaft portion 113 is reduced, and as a result, the rotation of the second arm 110 in the positive rotation direction S is allowed.

  On the other hand, as shown in FIG. 15B, when a load GK in the reverse rotation direction G is applied to the second arm 110, the second arm 110 attempts to rotate in the reverse rotation direction G around the rotation shaft portion 113. By such a rotation operation in the reverse rotation direction G, the frictional force GM in the reverse rotation direction G is applied to the contact portion 108 between the outer peripheral surface 113a of the rotary shaft portion 113 and the inner peripheral surface 107c of the tightening portion 107 of the winding member 106. Occur. The frictional force GM acts on the winding member 106 in the winding direction V with respect to the outer peripheral surface 113a of the rotating shaft portion 113, so that the winding member 106 has both ends 106a and 106b at fixed ends (more specifically, the rotating end). ) To be slightly elastically deformed in the winding direction V so that the inner diameter of the winding portion 107 decreases. Thereby, the winding force of the winding member 106 to the outer peripheral surface 113a of the rotating shaft part 113 increases, and as a result, the rotation of the second arm 110 in the reverse rotation direction G is prevented.

JP 2002-177082 A JP 2005-76735 A JP 2006-230720 A JP 2006-340798 A JP 2010-88682 A Japanese Patent No. 5232317

  According to the angle adjuster 160 described above, when the user adjusts the deployment angle of the second arm 110 with respect to the first arm 101 to any desired angle of the user, the second arm 110 rotates in the reverse rotation direction G. Is blocked by the winding member 106. Therefore, in this state, even if a load GK in the reverse rotation direction G is applied to the second arm 110 inadvertently, the second arm 110 does not rotate in the reverse rotation direction G, and therefore the deployment angle of the second arm 110 is maintained. The On the other hand, if the load SK in the forward rotation direction S is inadvertently applied to the second arm 110 in this state, the second arm 110 rotates in the forward rotation direction S relatively easily. As a result, the second arm 110 There is a difficulty that the deployment angle changes from the user's preferred angle.

  The present invention has been made in view of the above-described technical background, and the object thereof is to inadvertently apply a load in the forward rotation direction to the second arm at an arbitrary deployment angle position of the second arm with respect to the first arm. Even in such a case, an angle adjuster capable of preventing the rotation of the second arm in the positive rotation direction and a reclining chair including the angle adjuster are provided.

  The present invention provides the following means.

[1] A first arm provided with a winding member;
A second arm having a rotating shaft portion,
The rotating shaft portion is provided to be rotatable integrally with the second arm,
In the axial direction view of the rotating shaft portion, the first end portion and the second end portion of the winding member are spaced apart from each other and provided on the first arm,
The first arm and the second arm are configured such that the second arm is centered on the rotation shaft portion in a state where the winding tightening portion of the tightening member is wound on the outer peripheral surface of the rotation shaft portion. Connected to be rotatable relative to
The frictional force in the positive rotation direction generated at the contact portion between the outer peripheral surface of the rotary shaft portion and the inner peripheral surface of the winding fastening portion of the winding fastening member by the rotational movement of the second arm in the positive rotational direction is the winding force. By acting on the tightening member in the loosening direction with respect to the outer peripheral surface of the rotating shaft portion, the tightening force of the tightening member on the outer peripheral surface of the rotating shaft portion decreases, and the second arm moves in the positive rotation direction. Rotation is allowed and
The friction force in the reverse rotation direction generated in the contact portion by the rotation operation of the second arm in the reverse rotation direction acts on the winding member in the winding direction with respect to the outer peripheral surface of the rotary shaft portion, thereby causing the rotation. An angle adjuster configured to prevent a rotation of the second arm in a reverse rotation direction by increasing a tightening force of the tightening member on the outer peripheral surface of the shaft portion,
While having a 1st press part, the said 1st press part presses the said fastening member in the said fastening direction in the position of the arbitrary expansion angles of the said 2nd arm with respect to the said 1st arm, The said 2nd An angle adjuster characterized by comprising a forward rotation blocking means for blocking the rotation of the arm in the forward rotation direction.

[2] The forward rotation prevention means includes:
The winding of the tightening member by the first pressing portion, the first pressing portion provided at the output end, the first pressing position where the first pressing portion pressed the winding member in the winding direction, and the first pressing portion. A first toggle link mechanism that moves between a first release position in which the pressing in the tightening direction is released;
The angle adjuster according to claim 1, further comprising an operating rod that operates the first toggle link mechanism so that the first pressing portion moves between the first pressing position and the first release position.

[3] The first toggle link mechanism includes a first output toggle link, a swing toggle link, a toggle pin, and the first pressing portion.
The toggle pin pivotally attaches one end of the first output toggle link and one end of the swing toggle link,
The other end of the swing toggle link is pivotally attached to the first arm,
The first pressing portion is provided at the other end of the first output toggle link as the output end of the first toggle link mechanism.
The first toggle link mechanism is configured such that the first pressing portion is disposed at the first pressing position when the first output toggle link and the swing toggle link are substantially extended. 2. The angle adjuster according to 2.

[4] The first toggle link mechanism includes a first output toggle link, a swing toggle link, a toggle pin, a first pressing pin as the first pressing portion, and a first guide link.
The toggle pin pivotally attaches one end of the first output toggle link and one end of the swing toggle link,
The first pressing pin pivotally connects the other end of the first output toggle link as the output end of the first toggle link mechanism and the one end of the first guide link,
The other end of the swing toggle link is pivotally attached to the first arm,
The other end of the first guide link is pivotally attached to the first arm;
The first guide link guides the first pressing pin so that the first pressing pin moves between the first pressing position and the first release position.
The first toggle link mechanism is configured such that the first pressing pin is disposed at the first pressing position when the first output toggle link and the swinging toggle link are substantially extended. 2. The angle adjuster according to 2.

  [5] The preceding item 4 in which the first end portion of the winding member and the other end portion of the first guide link are pivotally attached to the first arm via a common first pivot pin. The described angle adjuster.

  [6] The preceding item 3 in which the second end portion of the winding member and the other end portion of the swing toggle link are pivotally attached to the first arm via a common second pivot pin. The angle adjuster in any one of -5.

[7] The second pivot pin is inserted into a guide long hole provided in the first arm and extending in an approaching direction with respect to the first end of the winding member,
In the first toggle link mechanism, the second pivot pin is moved to the first end portion of the winding member in the guide long hole by the bending operation of the first output toggle link and the swing toggle link. 7. The angle adjuster according to claim 6, wherein the angle adjuster is configured to elastically deform the winding member so as to be moved in an approaching direction thereby reducing the tightening force of the winding member.

[8] The first pressing portion is inserted through a first operation hole provided in the winding member and larger than a cross-sectional dimension of the first pressing portion.
The first toggle link mechanism is configured such that when the first pressing portion is disposed at the first pressing position, the first pressing portion presses a part of the inner peripheral surface of the first operation hole, whereby The angle adjuster according to any one of the preceding items 3 to 7, wherein one pressing portion is configured to press the winding member in the winding direction.

  [9] In the first toggle link mechanism, the first pressing portion presses another portion of the inner peripheral surface of the first operation hole when the first pressing portion is disposed at the first release position. The angle adjuster according to the preceding item 8, wherein the first pressing portion is configured to press the winding member in the loosening direction.

  [10] In the other portion of the inner peripheral surface of the first operation hole, the pressing force in the loosening direction acts on the winding member when the first pressing portion presses the other portion. As described above, the angle adjuster according to the preceding item 9 that is inclined with respect to the moving direction of the first pressing pin to the first release position.

[11] The toggle pin is inserted through a long hole provided in the winding member,
The first end portion of the long hole is the movement stop portion of the toggle pin when the first output toggle link and the swing toggle link are substantially extended. Angle adjuster.

  [12] The first toggle link mechanism is configured such that the toggle pin presses the second end of the elongated hole in the loosening direction when the first pressing portion is disposed at the first release position. 12. The angle adjuster according to 11 above.

  [13] The operation rod according to any one of items 3 to 12, wherein the operation rod is provided integrally with the first output toggle link so that the first output toggle link operates integrally with the operation operation of the operation rod. Angle adjuster.

  [14] The operation rod according to any one of the preceding items 3 to 13, wherein the operating rod is urged in a direction in which the first pressing portion moves toward the first pressing position by the urging force of the first urging member. Angle adjuster.

  [15] The second pressing portion has a second pressing portion, and the second pressing portion presses the winding member in the loosening direction at a position at an arbitrary deployment angle of the second arm with respect to the first arm. 15. The angle adjuster according to any one of the preceding items 2 to 14, further comprising release means for releasing the blocking of the rotation of the second arm in the reverse rotation direction by the winding member.

[16] The release means includes the second pressing portion provided at the output end, the second pressing portion pressing the winding member in the loosening direction, and the second pressing portion. A second toggle link mechanism for moving between the second release position where the loosening direction pressing of the winding member is released;
16. The angle adjuster according to item 15, wherein the operation lever further operates the second toggle link mechanism so that the second pressing portion moves between the second pressing position and the second releasing position. .

[17] The second toggle link mechanism includes a second output toggle link, the swing toggle link, the toggle pin, and the second pressing portion.
The toggle pin pivotally connects the one end of the first output toggle link, the one end of the swing toggle link, and one end of the second output toggle link;
The second pressing portion is provided at the other end of the second output toggle link as the output end of the second toggle link mechanism,
The second toggle link mechanism is configured such that the second pressing portion is disposed at the second pressing position when the second output toggle link and the swing toggle link are substantially extended. 16. The angle adjuster according to 16.

[18] The second toggle link mechanism includes a second output toggle link, the swing toggle link, the toggle pin, a second pressing pin as the second pressing portion, and a second guide link. ,
The toggle pin pivotally connects the one end of the first output toggle link, the one end of the swing toggle link, and one end of the second output toggle link;
The second pressing pin pivotally connects the other end of the second output toggle link as the output end of the second toggle link mechanism and the one end of the second guide link,
The other end of the second guide link is pivotally attached to the first arm;
The second guide link guides the second pressing pin so that the second pressing pin moves between the second pressing position and the second release position.
The second toggle link mechanism is configured such that the second pressing pin is arranged at the second pressing position when the second output toggle link and the swinging toggle link are substantially extended. 16. The angle adjuster according to 16.

[19] The second pressing portion is disposed in a second operation hole that is provided in the winding member and is larger than a cross-sectional dimension of the second pressing portion,
The second toggle link mechanism is configured such that when the second pressing portion is disposed at the second pressing position, the second pressing portion presses a part of the inner peripheral surface of the second operation hole, thereby The angle adjuster according to 17 or 18 above, wherein the two pressing portions are configured to press the winding member in the loosening direction.

  [20] The angle adjuster according to any one of [1] to [19], wherein the second arm is biased in the forward rotation direction.

[21] The left and right side frame portions of the seat frame and the left and right side frame portions of the back frame are connected to each other via left and right angle adjusters,
Each of the left and right angle adjusters includes a first arm to which a corresponding side frame portion of the seat frame is attached, and a second arm to which a corresponding side frame portion of the back frame is attached, and A reclining chair in which the first arm and the second arm are coupled so that the second arm is rotatable relative to the first arm,
21. A reclining chair, wherein at least one of the left and right angle adjusters is the angle adjuster according to any one of 1 to 20 above.

  The present invention has the following effects.

  Since the angle adjuster of the preceding item [1] includes the forward rotation preventing means, the second arm is rotated forward at an arbitrary deployment angle within the adjustable range of the deployment angle of the second arm with respect to the first arm. The rotation in the direction can be blocked by the forward rotation blocking means. Therefore, even when a load in the forward rotation direction is inadvertently applied to the second arm, the rotation of the second arm in the forward rotation direction can be prevented by the forward rotation prevention means, and thereby, the second arm can be prevented from rotating relative to the first arm. The deployment angle can be maintained.

  Further, the forward rotation preventing means has the first pressing portion, and the first pressing portion blocks the rotation of the second arm in the forward rotation direction by pressing the winding member in the winding direction. The rotation of the arm in the positive rotation direction can be reliably prevented.

  According to the preceding item [2], since the forward rotation preventing means includes the first toggle link mechanism and its operating rod, the operation of placing the first pressing portion at the first pressing position, that is, the forward rotation of the second arm. The operation for preventing the rotation of the direction can be performed with a small force, and the blocking operation can be easily performed.

  According to the previous item [3], the first toggle link mechanism is configured such that the first pressing portion is arranged at the first pressing position when the first output toggle link and the swing toggle link are substantially extended. Therefore, the operation of disposing the first pressing portion at the first pressing position, that is, the operation of blocking the rotation of the second arm in the positive rotation direction can be reliably performed with a small force, and the blocking operation is reliably performed. It can be done easily.

  According to the preceding item [4], the same effect as the effect of the preceding item [3] is achieved. Furthermore, since the first toggle link mechanism includes the first guide link, the first pressing pin can be reliably disposed at the first pressing position and the first release position, respectively.

  According to the previous item [5], the first end portion of the winding member and the other end portion of the first guide link are pivotally attached to the first arm via the common first pivot pin. The number of parts constituting the controller can be reduced. Thereby, the angle adjuster can be reduced in size, and the manufacturing cost of the angle adjuster can be reduced.

  According to the preceding item [6], the second end of the tightening member and the other end of the swinging toggle link are pivotally attached to the first arm via the common second pivot pin. The number of parts constituting the controller can be reduced. Thereby, the angle adjuster can be reduced in size, and the manufacturing cost of the angle adjuster can be reduced.

  According to the previous item [7], the second pivot pin is inserted into the guide slot by operating the first toggle link mechanism with the operating rod so that the first output toggle link and the swing toggle link are bent. Then, it moves in the approaching direction with respect to the first end of the tightening member. Thereby, the winding member is elastically deformed so that the winding force of the winding member is reduced. Therefore, the prevention of the rotation of the second arm in the reverse rotation direction can be reliably released.

  According to the previous item [8], since the first pressing portion is disposed in the first operation hole provided in the winding member, the first toggle link mechanism can be reduced in size, and the angle adjuster Miniaturization can be achieved. Furthermore, when the first pressing portion is disposed at the first pressing position, the winding member can be reliably pressed in the winding direction by the first pressing portion. Thereby, the rotation of the second arm in the positive rotation direction can be reliably prevented.

  According to the previous item [9], the first toggle link mechanism is configured such that the first pressing portion presses another portion of the inner peripheral surface of the first operation hole when the first pressing portion is disposed at the first release position. By doing so, the first pressing portion is configured to press the winding member in the loosening direction. Therefore, when the first pressing portion is disposed at the first release position, the winding member can be reliably pressed in the loosening direction by the first pressing portion. Thereby, the prevention of the rotation of the second arm in the reverse rotation direction can be reliably released.

  According to the preceding item [10], the effect of the preceding item [9] can be reliably achieved.

  According to the previous item [11], the toggle pin is inserted into the long hole of the tightening member, whereby the first toggle link mechanism can be downsized, and the angle adjuster can be downsized.

  Further, since the first end of the long hole is a toggle stop of the toggle pin when the first output toggle link and the swing toggle link are substantially extended, the movement of the toggle pin is the first end of the long hole. By stopping at the portion, the first output toggle link and the swing toggle link can be reliably held in the substantially extended state.

  According to the previous item [12], the first toggle link mechanism is configured such that the toggle pin presses the second end portion of the elongated hole in the loosening direction when the first pressing portion is disposed at the first release position. Therefore, the prevention of the rotation of the second arm in the forward rotation direction can be reliably released.

  According to the previous item [13], the operation rod is provided integrally with the first output toggle link, so that the first pressing portion of the first toggle link mechanism is arranged at the first pressing position, that is, the second arm. The operation of blocking the rotation of the second arm in the forward rotation direction can be reliably performed, and the operation of disposing the first pressing portion at the first release position, that is, the operation of releasing the blocking of the rotation of the second arm in the forward rotation direction Can be performed reliably.

  According to the preceding item [14], the operating rod is urged in the direction in which the first pressing portion moves toward the first pressing position by the urging force of the first urging member. The operation of disposing at the one pressing position, that is, the operation of preventing the rotation of the second arm in the positive rotation direction can be easily performed.

  According to the previous item [15], since the angle adjuster includes the release means, the second arm is rotated in the reverse rotation direction by the winding member at an arbitrary deployment angle of the second arm with respect to the first arm. The blocking can be released by the releasing means.

  Furthermore, the release means has a second pressing portion, and the second pressing portion releases the blocking of the rotation of the second arm in the reverse rotation direction by pressing the winding member in the loosening direction. The prevention of rotation in the reverse rotation direction can be reliably canceled.

  According to the previous item [16], since the releasing means includes the second toggle link mechanism, the operation of disposing the second pressing portion at the second pressing position, that is, blocking the rotation of the second arm in the reverse rotation direction is canceled. The operation to perform can be performed with a small force, and the release operation can be easily performed.

  According to the previous item [17], the second toggle link mechanism is configured such that the second pressing portion is disposed at the second pressing position when the second output toggle link and the swinging toggle link are substantially extended. Therefore, the operation of placing the second pressing portion at the second pressing position, that is, the operation of releasing the blocking of the rotation of the second arm in the reverse rotation direction can be reliably performed with a small force, and the releasing operation can be performed. It can certainly be done easily.

  Furthermore, since the toggle pin pivotally connects one end of the first output toggle link, one end of the swing toggle link, and one end of the second output toggle link, the number of parts constituting the angle adjuster is further increased. Can be reduced. Thereby, the size of the angle adjuster can be further reduced, and the manufacturing cost of the angle adjuster can be reduced.

  According to the previous item [18], the same effect as the effect of the previous item [17] is obtained. Furthermore, since the second toggle link mechanism includes the second guide link, the second pressing pin can be reliably arranged at the second pressing position and the second release position, respectively.

  According to the previous item [19], since the second pressing portion is disposed in the second operation hole provided in the winding member, the second toggle link mechanism can be reduced in size, and the angle is adjusted accordingly. The device can be further miniaturized. Furthermore, when the second pressing portion is disposed at the second pressing position, the second pressing portion can reliably press the winding member in the loosening direction. Thereby, the prevention of the rotation of the second arm in the reverse rotation direction can be reliably released.

  According to the previous item [20], since the second arm is biased in the forward rotation direction, when the blocking of the rotation of the second arm in the forward rotation direction by the forward rotation blocking means is released, the second arm is moved in the forward rotation direction. It automatically rotates in the forward rotation direction by the urging force. Therefore, the deployment angle of the second arm can be easily adjusted.

  The reclining chair of the preceding item [21] has an effect similar to that of any one of the preceding items [1] to [20] in the angle adjuster.

FIG. 1: is the perspective view which looked at the seat chair provided with the angle adjuster which concerns on 1st Embodiment of this invention as a right angle adjuster from the right front diagonally upper side. FIG. 2 is a perspective view of the same chair as viewed from the diagonally upper left side. FIG. 3 is a perspective view of the same angle adjuster as seen from the diagonally upper right rear side. FIG. 4 is a perspective view of the same angle adjuster as viewed from the upper left obliquely upper side. FIG. 5A is an exploded perspective view of the angle adjuster. FIG. 5B is a perspective view of the angle adjuster in the middle of assembly. FIG. 5C is a perspective view of a state in the middle of the assembly of the angle adjuster. FIG. 6A is a perspective view of the left-side angle adjuster according to the reference embodiment of the present invention when viewed from the upper left obliquely upper side. 6B is an exploded perspective view of the same angle adjuster shown in FIG. 6A. FIG. 7 is a side view of a winding member provided in the same angle adjuster of the first embodiment. FIG. 8 is an enlarged cross-sectional view for explaining the positional relationship between the tightening member and the rotation shaft portion of the second arm in a state where the operating rod of the forward rotation blocking means of the same angle adjuster is disposed at the neutral position. FIG. 9A is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where the operating rod of the forward rotation blocking means of the angle adjuster is disposed at the neutral position. FIG. 9B is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where the first pressing pin of the first toggle link mechanism of the same forward rotation preventing means is disposed at the first pressing position. FIG. 9C is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where a large load in the reverse rotation direction is applied to the second arm in the angle adjuster in the state shown in FIG. 9A. FIG. 9D is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where the first pressing pin is disposed at the first release position. FIG. 9E is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where the first pressing pin is arranged at the first release position and the toggle pin presses the second end of the elongated hole in the loosening direction. . FIG. 10A is an exploded perspective view of an angle adjuster according to the second embodiment of the present invention. FIG. 10B is a perspective view of the angle adjuster in the middle of assembly. FIG. 10C is a perspective view of a state in the middle of the assembly of the angle adjuster. FIG. 10D is a perspective view of a state partway through the assembly of the angle adjuster. FIG. 11 is a side view of a winding member provided in the angle adjuster. FIG. 12A is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where the operating rod of the forward rotation blocking means of the angle adjuster is disposed at the neutral position. FIG. 12B shows that the first pressing pin of the first toggle link mechanism of the same forward rotation preventing means is arranged at the first pressing position and the second pressing pin of the second toggle link mechanism of the releasing means is arranged at the second releasing position. It is an expanded sectional view explaining operation | movement of the same angle adjuster in the state which was. FIG. 12C is an enlarged cross-sectional view illustrating the operation of the angle adjuster in a state where the second pressing pin of the second toggle link mechanism is disposed at the second pressing position. FIG. 13A is an exploded perspective view of an angle adjuster according to a third embodiment of the present invention. FIG. 13B is a perspective view of the angle adjuster in the middle of assembly. FIG. 14A is an enlarged cross-sectional view for explaining the operation of the angle adjuster in a state where the first pressing pin of the first toggle link mechanism of the forward rotation preventing means of the angle adjusting device is disposed at the first pressing position. . FIG. 14B shows the operation of the angle adjuster in a state in which the first pressing pin is arranged at the first release position and the second pivot pin is moved in the approaching direction with respect to the first end of the winding member. It is an expanded sectional view explaining. FIG. 15A is an enlarged cross-sectional view for explaining the operation of the angle adjuster when a load in the positive rotation direction is applied to the second arm of the conventional angle adjuster. FIG. 15B is an enlarged cross-sectional view for explaining the operation of the angle adjuster when a load in the reverse rotation direction is applied to the second arm of the angle adjuster.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
1 to 9E are views for explaining the angle adjuster 60 according to the first embodiment of the present invention.

  As shown in FIGS. 1 and 2, the angle adjuster 60 according to the first embodiment is used for a seating chair 90 as a reclining chair, for example. In these drawings, F means the front direction of the angle adjuster 60 (and the chair 90), R means the right direction, and L means the left direction.

  The seat 90 includes a seat frame 91, a back frame 92, and the like. The seat frame 91 and the back frame 92 are each made of a metal round pipe material bent into a substantially U shape.

  The seat frame 91 includes a pair of left and right side frame portions 91a and 91a arranged in parallel to each other, and a front frame portion 91b in which the front ends of both side frame portions 91a and 91a are connected to each other. Between the rear end portions of the side frame portions 91a and 91a, a thin strip-shaped metal reinforcing crosspiece 91c is installed.

  The back frame 92 includes a pair of left and right side frame portions 92a and 92a arranged in parallel to each other, and an upper frame portion 92c in which the upper ends of both side frame portions 92a and 92a are connected to each other. A cylindrical metal connection socket 92b is fixed to the lower end of each side frame portion 92a. Between the connecting sockets 92b and 92b, a narrow metal reinforcing horizontal bar 92d is installed.

  The right frame portion 91a of the seat frame 91 and the right frame portion 92a of the back frame 92 are connected to each other via the angle adjuster 60 according to the first embodiment as a right angle adjuster. On the other hand, the left frame portion 91a of the seat frame 91 and the left frame portion 92a of the back frame 92 are connected to each other via an angle adjuster 70 according to one embodiment of the present invention as a left angle adjuster.

  The unfolding angle of the back frame 92 relative to the seat frame 91 can be adjusted steplessly by the left and right angle adjusters 60 and 70. The seat frame 91, the back frame 92, and both angle adjusters 60 and 70 are disposed inside a flexible cushion member 93 indicated by a two-dot chain line.

  The configuration of the angle adjuster (that is, the right angle adjuster) 60 of the first embodiment is as follows.

  The angle adjuster 60 is also called an angle adjustment fitting, and includes a first arm 1, a second arm 10, and the like as shown in FIGS. 3 and 4.

  The first arm 1 and the second arm 10 are both made of metal, and more specifically made of steel. Then, as shown in FIG. 4, the first arm 1 and the second arm 10 so that the second arm 10 can rotate in the forward rotation direction S and the reverse rotation direction G relative to the first arm 1. Are connected to each other. In FIG. 4, θ is a deployment angle of the second arm 10 with respect to the first arm 1. In the angle adjuster 60, the adjustable range of the deployment angle θ of the second arm 10 is set to a range of about 90 ° to about 180 °, for example.

  In the first embodiment, as shown in FIG. 4, the rotation direction of the second arm 10 in which the deployment angle θ of the second arm 10 with respect to the first arm 1 decreases is referred to as “forward rotation direction S” and vice versa. The rotation direction is referred to as “reverse rotation direction G”. Accordingly, the forward rotation direction S of the second arm 10 is set to a rotation direction in which the deployment angle θ of the second arm 10 (back frame 92) with respect to the first arm 1 (seat frame 91) decreases, The reverse rotation direction G of the two arms 10 is set to a rotation direction in which the deployment angle θ of the second arm 10 (back frame 92) with respect to the first arm 1 (seat frame 91) increases.

  The first arm 1 includes a cylindrical attachment portion 2. 1 and 2, the rear end portion of the right frame portion 91a of the seat frame 91 is inserted into the attachment portion 2, and in this state, the rear end portion of the right frame portion 91a is attached to the attachment portion 2 by rivets. It is attached. Therefore, the attachment portion 2 is provided with a rivet insertion hole 2a. In addition, the attachment method to the attachment part 2 of the right side frame part 91a is not limited to riveting, and, for example, it may be caulking or welding.

  A bottom plate portion in which a pair of left and right outer plate portions 3 and 3 arranged in parallel to each other in the left and right directions L and R are connected to the base end portion of the mounting portion 2 and the lower ends of both outer plate portions 3 and 3 are connected to each other. 4 (see FIG. 8) and an upper plate portion 5 in which the upper ends of both outer plate portions 3 and 3 are connected to each other are integrally formed. Note that the left and right directions L and R of the angle adjuster 60 coincide with the thickness direction T of the angle adjuster 60, and also coincide with the axial direction of the rotary shaft portion 13 described later.

  Furthermore, the 1st arm 1 is provided with the left-right paired metal winding members 6 and 6 as shown to FIG. Both winding fastening members 6, 6 are arranged between both outer side plate portions 3, 3. The winding member 6 allows rotation of the second arm 10 in the forward rotation direction S but prevents rotation of the second arm 10 in the reverse rotation direction G. The detailed configuration of the winding member 6 will be described later.

  As shown in FIGS. 5A and 5B, the second arm 10 is configured by integrally combining a pair of left and right second arm constituent pieces 10a and 10a. As shown in FIG. 5A, in a state before the combination of the two component pieces 10a and 10a, a plurality of pieces that can be fitted to each other to prevent the positional deviation between the two component pieces 10a and 10a are combined on the combination surface of the component pieces 10a. The fitting projection 10b and the fitting hole 10c are formed. The two component pieces 10a and 10a are fastened together by the rivet 15 in a state of being combined with each other, whereby the second arm 10 is formed. “15a” in FIG. 5A is an insertion hole for the rivet 15.

  Further, the second arm 10 includes a cylindrical attachment portion 11. 1 and 2, the attachment portion 11 is inserted into the connecting socket 92b at the lower end portion of the right frame portion 92a of the back frame 92. In this state, the lower end portion of the right frame portion 92a is attached to the attachment portion 11. It is attached by a plurality of rivets through the connection socket 92b. Therefore, a plurality of rivet insertion holes 11 a are formed in the attachment portion 11. In addition, the attachment method to the attachment part 11 of the right side frame part 92a is not limited to riveting, In addition, for example, caulking prevention, welding, etc. may be sufficient.

  As shown in FIGS. 5A and 5B, in the second arm 10, a substantially circular or substantially semicircular rotating plate portion 12 is integrally formed at the base end portion of the mounting portion 11, thereby the rotating plate portion. 12 is provided on the second arm 10 so as to be rotatable together with the second arm 10. Furthermore, a rotating shaft portion 13 that protrudes to both sides in the thickness direction of the rotating plate portion 12 (that is, both sides in the left-right direction of the rotating plate portion 12) is integrally formed at a substantially central portion of the rotating plate portion 12. Thus, the rotary shaft portion 13 is provided on the second arm 10 so as to be able to rotate integrally with the second arm 10, that is, the rotary shaft portion 13 is attached to the second arm 10 so as to rotate integrally with the rotation operation of the second arm 10. Is provided. The rotating shaft portion 13 is formed from a boss portion having a circular cross section. The outer peripheral surface 13 a of the rotating shaft portion 13 is formed as a cylindrical surface centered on the axis of the rotating shaft portion 13. The rotating shaft portion 13 is formed by locally pressing and bending a substantially central portion of the rotating plate portion 12 into a circular cross section.

  Here, in FIGS. 3 and 4, J indicates the axis of the rotary shaft portion 13. Furthermore, in the angle adjuster 60, the axial direction view of the rotating shaft portion 13 is a direction view along the axis J, that is, a direction view of the arrow Z.

  Next, the configuration of the winding member 6 will be described below. In the present specification, the first end 6a and the second end 6b of the winding member 6 mean one end and the other end of the both ends of the winding member 6, respectively. .

  As shown in FIGS. 5A and 5B, the winding members 6 and 6 have the same shape and the same size, and have spring elasticity. As shown in FIG. 5B, the two fastening members 6 and 6 are arranged in parallel to each other with the rotating plate portion 12 of the second arm 10 sandwiched between the two fastening members 6 and 6, and further, FIG. In this state, as shown in FIG. 3, the first arm 1 is disposed between the outer side plate portions 3 and 3. As shown in FIGS. 5C and 8, the first end 6 a and the second end 6 b of each tightening member 6 are separated from each other in the axial direction view of the rotary shaft 13 of the first arm 1. The arm 1 is pivotally attached to both outer side plate portions 3 and 3 via a first pivot pin 31 and a second pivot pin 32, respectively. The first pivot pin 31 and the second pivot pin 32 are each composed of rivets.

  That is, as shown in FIGS. 5A and 5B, the first insertion holes 3a and 6c for the first pivot pin 31 are formed in the outer plate portions 3 and the first end portions 6a of the winding members 6, respectively. ing. The cross-sectional shape of the first pivot pin 31 is a circular shape, and the cross-sectional shapes of the first insertion holes 3 a and 6 c are circular shapes corresponding to the cross-sectional shape of the first pivot pin 31. Then, the first pivot pin 31 is inserted in communication with the first insertion holes 3a and 6c, and the tip portion thereof is crushed into a large diameter (see FIG. 4). As a result, as shown in FIGS. 5C and 8, the first end 6 a of each tightening member 6 is pivotally attached to both outer side plate parts 3, 3 via the first pivoting pins 31 and both outer side plate parts. 3 and 3 and the first end portions 6 a and 6 a of the both fastening members 6 and 6 are connected (fastened) to each other via a first pivot pin 31.

  Furthermore, the second insertion holes 3b and 6d for the second pivot pin 32 are formed in the outer plate portions 3 and the second end portions 6b of the winding members 6 respectively. The cross-sectional shape of the second pivot pin 32 is circular, and the cross-sectional shape of each of the second insertion holes 3 b and 6 d is a circle corresponding to the cross-sectional shape of the second pivot pin 32. And the 2nd pivot pin 32 is penetrated by these 2nd insertion holes 3b and 6d, and the front-end | tip part is crushed by large diameter (refer FIG. 4). As a result, as shown in FIGS. 5C and 8, the second end portion 6 b of each winding member 6 is pivotally attached to both outer side plate portions 3, 3 via the second pivoting pins 32, and both outer side plate portions. 3 and 3 and the 2nd end part 6b, 6b of both the winding fastening members 6 and 6 are mutually connected (fastened) via the 2nd pivot pin 32. As shown in FIG.

  As shown in FIGS. 5A and 7, a portion of each winding member 6 between the first end portion 6 a and the second end portion 6 b, that is, an intermediate portion of each winding member 6 has a winding portion bent in an arc shape. (Winding portion) 7 is formed. Then, as shown in FIG. 5B, the rotary shaft portion 13 of the second arm 10 is disposed in a press-fitted state and rotatable inside each winding fastening portion 7. Thus, by arrange | positioning the rotating shaft part 13 inside the winding part 7, the winding part 7 of the winding member 6 is in the state wound by the outer peripheral surface 13a of the rotating shaft part 13, and also. The winding member 6 is in a state where the outer peripheral surface 13a of the rotating shaft portion 13 is constantly wound by its own spring elastic force. As shown in FIG. 8, the first arm 1 and the second arm 10 are configured so that the second arm 10 is reverse to the first arm 1 around the rotation shaft portion 13 in the forward rotation direction S and the reverse direction. It is connected so that it can rotate in the rotation direction G.

  The inner peripheral surface 7 c of the winding portion 7 is formed as an arc surface corresponding to the outer peripheral surface 13 a of the rotating shaft portion 13. Therefore, the inner peripheral surface 7c of the tightening portion 7 is in continuous contact with the outer peripheral surface 13a of the rotating shaft portion 13 in the circumferential direction, and the inner peripheral surface 7c of the tightening portion 7 rotates. The shaft portion 13 is in pressure contact with the outer peripheral surface 13a.

  Here, as shown in FIG. 7, a portion 6 f between the winding portion 7 and the first end portion 6 a in the winding member 6 is replaced with a “short side portion 6 f” of the winding member 6, and the winding member 6. A portion 6e between the tightening portion 7 and the second end portion 6b is referred to as a “long side portion 6e” of the tightening member 6. As shown in FIG. 8, the short side portion 6 f and the long side portion 6 e are arranged apart from each other in the vertical direction when the rotary shaft portion 13 is viewed in the axial direction.

  In the angle adjuster 70 of the first embodiment, the winding member 6 has the first end 6a and the second end 6b as fixed ends (more specifically, rotating ends), and the inner diameter of the winding portion 7 increases. By elastically deforming in the loosening direction U as described above, the tightening force of the tightening member 6 on the outer peripheral surface 13a of the rotary shaft portion 13 is reduced, and thereby the rotation of the second arm 10 in the positive rotation direction S is reduced. It is acceptable. On the other hand, the winding member 6 uses the first end portion 6a and the second end portion 6b as fixed ends (more specifically, a rotating end), and elastically moves in the winding direction V so that the inner diameter of the winding portion 7 decreases. By deforming, the tightening force of the tightening member 6 on the outer peripheral surface 13a of the rotating shaft portion 13 increases, thereby preventing the second arm 10 from rotating in the reverse rotation direction G.

  Here, in order to explain the positional relationship between the winding member 6 and the rotary shaft portion 13, as shown in FIG. 8, the first end portion 6 a of the winding member 6 in the first end portion 6 a is viewed in the axial direction of the rotary shaft portion 13. The pivot position of the first arm 1 (specifically, the outer plate portion 3 of the first arm 1) is “first pivot position P1”, and the first arm 1 of the second end 6b of the winding member 6 (details). Then, the pivoting position of the first arm 1 with respect to the outer plate 3) is “second pivoting position P2”, between the first pivoting position P1 and the center position P0 of the tightening part 7 of the tightening member 6. The linear distance is defined as “first distance Y1”, and the linear distance between the second pivot position P2 and the center position P0 of the winding portion 7 is defined as “second distance Y2”. The first pivot position P1 is the axis of the first pivot pin 31 and the second pivot position P2 is the axis of the second pivot pin 32. The center position P0 of the winding part 7 coincides with the axial center position of the rotary shaft part 13. Furthermore, a straight line connecting the first pivot position P1 and the center position P0 of the tightening portion 7 is defined as a “reference line B”.

  As shown in the figure, the first distance Y1 is set shorter than the second distance Y2 (ie, Y1 <Y2).

Further, the first pivoting position P1 is on the center position P0 side of the tightening portion 7 with respect to the second pivoting position P2 and on the first pivoting position P1 side with respect to the center position P0 of the winding tightening portion 7. Is arranged.
That is, the first pivot attachment position P1 is disposed between the second pivot attachment position P2 and the center position P0 of the winding fastening portion 7.

  The forward rotation direction S of the second arm 10 is such that the portion 7 a (see FIG. 7) on the second end 6 b (second pivot attachment position P 2) side of the tightening portion 7 of the tightening member 6 is the outer periphery of the rotation shaft portion 13. The rotation direction is set from the surface 13a. On the other hand, the reverse rotation direction G of the second arm 10 is set to a rotation direction in which the portion 7 a in the winding portion 7 of the winding member 6 is wound around the outer peripheral surface 13 a of the rotary shaft portion 13.

  The first pivot position P1 is preferably arranged within a range of ± 45 ° with respect to the reference line B with the center position P0 of the winding portion 7 as the center. By so doing, the winding member 6 can reliably prevent the rotation of the second arm 10 in the reverse rotation direction G. A particularly desirable range is ± 30 °. In the figure, the upstream side in the reverse rotation direction G of the rotation shaft portion 13 of the second arm 10 with respect to the reference line B is shown as “−”, and the downstream side in the reverse rotation direction G is shown as “+”. In particular, the first pivot position P1 is + 45 ° from 0 ° with respect to the reference line B around the center position P0 of the tightening portion 7 to the downstream side in the reverse rotation direction G of the rotary shaft portion 13 of the second arm 10. It is desirable to arrange within the range up to, and more desirably within the range of + 0.5 ° to + 5 °.

  The inner peripheral surface 7c of the tightening portion 7 of the tightening member 6 is centered on the outer peripheral surface 13a of the rotating shaft portion 13 with the axial center position of the rotating shaft portion 13 (that is, the center position P0 of the tightening portion 7). It is desirable that the contact is made in an area of 180 ° or more. By doing so, it is possible to reliably prevent the rotary shaft portion 13 from falling off the winding fastening portion 7. In particular, the inner peripheral surface 7c of the tightening portion 7 is in a region less than 360 ° centered on the outer peripheral surface 13a of the rotating shaft portion 13 and the axial center position of the rotating shaft portion 13 (center position P0 of the tightening portion 7). It is desirable that they are in contact with each other, and in the first embodiment, the inner peripheral surface 7c of the tightening portion 7 is in contact with a region within a range of 270 ° to 355 °. Therefore, the number of windings in which the winding part 7 of the winding member 6 is wound around the outer peripheral surface 13a of the rotating shaft part 13 is smaller than one.

  Here, in this invention, it does not exclude that the winding part 7 of the winding member 6 is spirally wound around the outer peripheral surface 13a of the rotating shaft part 13 one or more times (for example, 1.5 to 20 turns). Absent. However, as in the first embodiment, it is particularly desirable that the number of turns around the rotating shaft portion outer peripheral surface 13a of the tightening portion 7 of the tightening member 6 is smaller than one turn. Compared to the case of one or more turns, the thickness dimension of the tightening portion 7 of the tightening member 6 can be made as small as possible, and thus the angle adjuster 60 can be reduced in size (more specifically, thinner). it can.

  The winding member 6 is formed by stamping a flat metal base plate (not shown) into an outer diameter shape of the winding member 6 in the thickness direction by a press punching apparatus (not shown). . Further, the winding member 6 is subjected to a quenching process to increase its hardness. In the first embodiment, the metal base plate is made of a steel plate such as a spring steel plate. Therefore, the winding member 6 has excellent spring elastic force in the winding direction V and the loosening direction U.

  Further, the first end 6a and the second end 6b of the winding member 6 are arranged so that the winding direction V and the loosening direction U of the winding member 6 are parallel to the surface of the metal base plate. The outer plate 3 is pivotally attached. Thereby, the winding member 6 has a strong spring elastic force (that is, a large spring constant). Therefore, a thin member can be used as the winding member 6, and thus the angle adjuster 60 can be reliably reduced in size (thinned).

  Further, the angle adjuster 60 of the first embodiment prevents forward rotation that prevents the second arm 10 from rotating in the forward rotation direction S at the position of the arbitrary deployment angle θ of the second arm 10 with respect to the first arm 1. Means 20 are provided.

  Here, for convenience of explanation, the operation of the angle adjuster 60 when the angle adjuster 60 of the first embodiment does not include the forward rotation prevention means 20 will be described below.

  In this case, the angle adjuster 60 operates in the same manner as the conventional angle adjuster 160 shown in FIGS. 15A and 15B.

  That is, as shown in FIG. 8, when a load SK in the forward rotation direction S is applied to the second arm 10, the second arm 10 attempts to rotate in the forward rotation direction S around the rotation shaft portion 13. By such a rotation operation in the positive rotation direction S, the frictional force SM in the positive rotation direction S is applied to the contact portion 8 between the outer peripheral surface 13a of the rotary shaft portion 13 and the inner peripheral surface 7c of the tightening portion 7 of the tightening member 6. Occur. When the frictional force SM acts on the winding member 6 in the loosening direction U with respect to the outer peripheral surface 13a of the rotating shaft portion 13, the winding member 6 has a first end portion 6a and a second end portion 6b (more specifically, The first pivot pin 31 and the second pivot pin 32) are used as fixed ends (more specifically, rotation ends) and are slightly elastically deformed in the loosening direction U so that the inner diameter of the tightening portion 7 increases. Thereby, the winding force of the winding member 6 to the outer peripheral surface 13a of the rotating shaft part 13 decreases, and as a result, the rotation of the second arm 10 in the positive rotation direction S is allowed. “◯” in FIG. 8 indicates that the rotation of the second arm 10 in the positive rotation direction S is permitted.

  On the other hand, when a load GK in the reverse rotation direction G is applied to the second arm 10, the second arm 10 attempts to rotate in the reverse rotation direction G around the rotation shaft portion 13. By such a rotation operation in the reverse rotation direction G, the frictional force GM in the reverse rotation direction G is applied to the contact portion 8 between the outer peripheral surface 13a of the rotary shaft portion 13 and the inner peripheral surface 7c of the tightening portion 7 of the winding member 6. Occur. When the frictional force GM acts on the winding member 6 in the winding direction V with respect to the outer peripheral surface 13a of the rotating shaft portion 13, the winding member 6 has a first end portion 6a and a second end portion 6b (detailed). Then, the first pivot pin 31 and the second pivot pin 32) are used as fixed ends (more specifically, rotating ends), and the first pivot pin 31 and the second pivot pin 32 are elastically slightly deformed in the winding direction V so that the inner diameter of the winding portion 7 is reduced. Thereby, the winding force of the winding member 6 to the outer peripheral surface 13a of the rotating shaft part 13 increases, As a result, rotation of the 2nd arm 10 in the reverse rotation direction G is blocked | prevented. “X” in FIG. 8 indicates that the rotation of the second arm 10 in the reverse rotation direction G is prevented.

  “3f” in FIG. 8 is a regulating member made of rivets. The regulating member 3f regulates at least the deformation amount in the winding direction V among the deformation amount in the winding direction V and the deformation amount in the loosening direction U of the winding member 6. The restricting member 3f is attached to the first arm 1 as follows.

  That is, as shown in FIGS. 5A and 5B, each outer plate portion 3 of the first arm 1 is provided with a through hole 3e for a restricting member 3f. The cross-sectional shape of the restricting member 3f is circular, and the cross-sectional shape of the insertion hole 3e is a circular shape corresponding to the cross-sectional shape of the restricting member 3f. A restriction hole 14 is provided in the central portion of the rotation shaft portion 13 of the second arm 10 so as to penetrate in the axial direction. The cross-sectional shape of the restriction hole 14 is circular, and the size (diameter) of the restriction hole 14 is set larger than the diameter of the restriction member 3f. Then, as shown in FIGS. 5B, 5C, and 8, the restricting member 3f is inserted into the insertion hole 3e and the restricting hole 14, and the tip end portion thereof is crushed into a large diameter (see FIG. 4). . As a result, the outer side plate portions 3 and 3 of the first arm 1 and the rotary shaft portion 13 are connected (fastened) via the regulating member 3f.

  In a state where neither the load SK in the forward rotation direction S nor the load GK in the reverse rotation direction G is applied to the second arm 10, the restriction member 3 f is disposed at a substantially central position of the restriction hole 14 as shown in FIG. Yes. Therefore, an annular gap is formed between the regulating member 3f and the inner peripheral surface of the regulating hole 14 over the entire circumference K of the regulating member 3f. When a large load GK in the reverse rotation direction G is applied to the second arm 10, the amount of deformation of the winding member 6 in the winding direction V increases significantly, and the inner peripheral surface of the restriction hole 14 strikes the restriction member 3f. (See FIG. 9C). Thereby, the deformation amount of the winding member 6 in the winding direction V is regulated.

  Next, the configuration of the forward rotation prevention means 20 provided in the angle adjuster 60 of the first embodiment will be described below.

  As shown in FIG. 9A, the forward rotation blocking means 20 has a first pressing pin 23 as the first pressing portion 21 and is at a position at an arbitrary deployment angle θ of the second arm 10 with respect to the first arm 1. When the 1 pressing pin 23 presses the winding member 6 in the winding direction V, the rotation of the second arm 10 in the forward rotation direction S is prevented.

  The forward rotation blocking means 20 includes a first toggle link mechanism 22 and an operating rod 30 for performing the above-described operation. The toggle link mechanism is also called a toggle mechanism or a boost mechanism.

  The first toggle link mechanism 22 has the first pressing pin 23 (its axial center Q1) provided at the output end of the first toggle link mechanism 22 in the first pressing position M1 shown in FIG. 9B and FIG. 9D. It moves between the indicated first release positions N1.

  The first pressing position M1 is a position where the first pressing pin 23 presses the winding member 6 in the winding direction V as shown in FIG. 9B.

  The first release position N1 is a position where the pressing in the winding direction V of the winding member 6 by the first pressing pin 23 is released as shown in FIG. 9D. More specifically, in the first embodiment, the first release position N <b> 1 is the release of the pressing in the winding direction V of the winding member 6 by the first pressing pin 23, and the first pressing pin 23 moves the winding member 6. This is the position pressed in the loosening direction U.

  Here, in the winding member 6, the winding direction V means a direction in which the winding member 6 is deformed so that the inner diameter of the winding portion 7 of the winding member 6 decreases. Further, in the winding member 6, the loosening direction U means a direction in which the winding member 6 is deformed so that the inner diameter of the winding portion 7 of the winding member 6 increases. Therefore, when the first pressing pin 23 (the first pressing portion 21) presses the winding member 6 in the winding direction V, that is, the winding member 6 so that the inner diameter of the winding portion 7 of the winding member 6 is reduced. This means that the first pressing pin 23 (first pressing portion 21) presses the winding member 6 in the direction in which the winding member 6 is deformed. Further, when the first pressing pin 23 (the first pressing portion 21) loosens the winding member 6 and presses it in the direction U, that is, the winding member 6 increases so that the inner diameter of the winding portion 7 of the winding member 6 increases. This means that the first pressing pin 23 (first pressing portion 21) presses the winding member 6 in the direction of deformation.

  As shown in FIG. 9A, the first toggle link mechanism 22 includes the first pressing pin 23, a first output toggle link 24, a swing toggle link 25, a toggle pin 26, and a first guide link 27. ing.

  The first output toggle link 24 is made of a metal first output toggle link member, the swing toggle link 25 is made of a metal swing toggle link member, and the first guide link 27 is made of a metal first guide link member.

  As shown in FIGS. 5A to 5C, the first pressing pin 23 and the toggle pin 26 are each formed of a rivet. The cross-sectional shapes of the first pressing pin 23 and the toggle pin 26 are each circular.

  As shown in FIGS. 3 and 4, the first output toggle link 24 is disposed on the outer surface side of one outer plate portion 3 of the first arm 1 and on the outer surface side of the other outer plate portion 3. An operating rod 30 is integrally formed with both first output toggle links 24, 24 so as to connect both first output toggle links 24, 24. Thereby, the operating rod 30 is provided integrally with the first output toggle link 24 so that the first output toggle link 24 operates integrally with the operating operation of the operating rod 30.

  As shown in FIG. 5B, the swing toggle link 25 and the first guide link 27 are disposed between the winding members 6 and 6. 9A, one end of the first output toggle link 24 and one end as the swing end of the swing toggle link 25 are pivoted to each other via a toggle pin 26. As shown in FIG.

  That is, as shown in FIG. 5A, insertion holes 24a and 25a for toggle pins 26 are formed in one end portion of each first output toggle link 24 and one end portion (swing end portion) of the swing toggle link 25, respectively. ing. The cross-sectional shape of each insertion hole 24 a, 25 a is a circular shape corresponding to the cross-sectional shape of the toggle pin 26. The toggle pin 26 is inserted in communication with these insertion holes 24a and 25a, and as a result, as shown in FIG. 9A, one end portion (insertion hole 24a) of the first output toggle link 24 and the swing toggle link. One end portion (insertion hole 25 a) of 25 is pivotally attached to each other via a toggle pin 26. In other words, the toggle pin 26 pivotally connects one end portion (insertion hole 24a) of the first output toggle link 24 and one end portion (insertion hole 25a) of the swing toggle link 25 to each other.

  Further, as shown in FIGS. 5A to 5C, the toggle pin 26 is loosely inserted into the loose insertion holes 3 d for the toggle pins 26 formed in the respective outer plate portions 3 of the first arm 1, and each of the winding members 6 is further inserted. It is also inserted into a long hole 6i (see FIG. 7) for a toggle pin 26 formed in the long side portion 6e. And the front-end | tip part of the toggle pin 26 is crushed by large diameter shape (refer FIG. 4). As a result, one end portions (insertion holes 24a and 24a) of both first output toggle links 24 and 24, one end portion (insertion hole 25a) of the swing toggle link 25, both outer side plate portions 3 and 3, and both tightening members 6 , 6 are connected (fastened) to each other through a toggle pin 26.

  The loose insertion holes 3d of each outer plate portion 3 are formed in a shape and size so as not to contact the inner peripheral surface of the loose insertion hole 3d even if the toggle pin 26 loosely inserted therein moves in a predetermined direction. Has been.

  The long hole 6 i of each winding member 6 is formed to extend in the arc direction around the second pivot pin 32. One first end 6x of both ends of the long hole 6i constitutes a movement stop portion of the toggle pin 26 when the first output toggle link 24 and the swing toggle link 25 are substantially extended. The role of the other second end 6y of the long hole 6i will be described later.

  The other end of the first output toggle link 24 corresponds to the output end of the first toggle link mechanism 22. 9A, the other end portion of the first output toggle link 24 and one end portion as the swing end portion of the first guide link 27 are pivoted to each other via the first pressing pin 23. .

  That is, as shown in FIG. 5A, the insertion holes 24b, 27a for the first pressing pin 23 are formed in the other end portion of each first output toggle link 24 and one end portion (swinging end portion) of the first guide link 27, respectively. Is drilled. The cross-sectional shape of each of the insertion holes 24 b and 27 a is a circular shape corresponding to the cross-sectional shape of the first pressing pin 23. The first pressing pin 23 is inserted in communication with these insertion holes 24b and 27a, and as a result, as shown in FIG. 9A, the other end portion (insertion hole 24b) of the first output toggle link 24 and the first One end portion (insertion hole 27 a) of the one guide link 27 is pivotally attached to each other via the first pressing pin 23. In other words, the first pressing pin 23 pivots the other end portion (insertion hole 24 b) of the first output toggle link 24 and one end portion (insertion hole 27 a) of the first guide link 27.

  The first guide link 27 is such that the first pressing pin 23 (its axial center Q1) moves between the first pressing position M1 (see FIG. 9B) and the first release position N1 (see FIG. 9D). The pressing pin 23 is guided.

  Furthermore, as shown in FIGS. 5A to 5C, the first pressing pin 23 is loosely inserted into the first pressing pin 23 loose insertion holes 3 c formed in each outer plate 3 of the first arm 1, and further, The first operation hole 6g (see FIG. 7) drilled in the long side portion 6e of each winding member 6 is also inserted. And the front-end | tip part of the 1st press pin 23 is crushed by large diameter shape (refer FIG. 4). As a result, the other end portions (insertion holes 24b, 24b) of both first output toggle links 24, 24, one end portion (insertion hole 27a) of the first guide link 27, both outer side plate portions 3, 3, and both winding members The long side portions 6 e and 6 e of 6 and 6 are connected (fastened) via the first pressing pin 23.

  The loose insertion holes 3c of the respective outer plate portions 3 are shaped and sized so as not to come into contact with the inner peripheral surface of the loose insertion holes 3c even if the first pressing pin 23 loosely inserted therein moves in a predetermined direction. Is formed. The first operation hole 6g of each tightening member 6 is formed larger than the cross-sectional dimension of the first pressing pin 23, and the detailed configuration thereof will be described later.

  As shown in FIG. 9A, the other end as the base end of the first guide link 27 is pivotally supported by the first pivot pin 31. That is, as shown in FIG. 5A, the insertion hole 27 b for the first pivot pin 31 is formed in the other end portion of the first guide link 27. The cross-sectional shape of the insertion hole 27 b is a circular shape corresponding to the cross-sectional shape of the first pivot pin 31. The first pivot pin 31 is inserted into the insertion hole 27b, whereby the other end (insertion hole 27b) of the first guide link 27 and the first end 6a (first insertion) of each winding member 6 are inserted. The hole 6c) is pivotally attached to both outer side plate portions 3 and 3 of the first arm 1 via a first pivoting pin 31 which is common to each other.

  As shown in FIG. 9A, the other end as the base end of the swing toggle link 25 is pivotally supported by the second pivot pin 32. That is, as shown in FIG. 5A, the insertion hole 25 b for the second pivot pin 32 is formed in the other end portion of the swing toggle link 25. The cross-sectional shape of the insertion hole 25 b is a circular shape corresponding to the cross-sectional shape of the second pivot pin 32. Then, the second pivot pin 32 is inserted into the insertion hole 25b, whereby the other end portion (insertion hole 25b) of the swing toggle link 25 and the second end portion 6b (second insertion portion) of each winding member 6 are inserted. The hole 6d) is pivotally attached to both outer side plate portions 3 of the first arm 1 via a second pivoting pin 32 which is common to each other.

  The axial directions of the first pivot pin 31, the second pivot pin 32, the first pressing pin 23 (its axis Q 1) and the toggle pin 26 (its axis W) are in the direction of the axis J of the rotary shaft 13. And parallel.

  In FIG. 5A, a portion 28 between the first insertion hole 3 a and the second insertion hole 3 b in each outer plate portion 3 of the first arm 1 has a first pivot pin 31 (that is, the first guide link 27 of the first guide link 27. A base link is formed by connecting the other end) and the second pivot pin 32 (that is, the other end of the first swing toggle link 25).

  In FIG. 9A, “L1” is a link line of the first output toggle link 24, “L2” is a link line of the swing toggle link 25, “L3” is a link line of the first guide link 27, “L4” is a link line of the base link 28.

  The other end of the first output toggle link 24 (specifically, the axial center Q1 of the first pressing pin 23) and the other end of the swing toggle link 25 (specifically, the first output toggle link 24 when viewed in the axial direction of the rotary shaft 13) A straight line C1 connecting the second pivot attachment position P2), which is the axis of the two pivot attachment pins 32, is defined as a “first reference line C1”.

  The operating rod 30 is a lever type that operates the first toggle link mechanism 22 so that the first pressing pin 23 moves between the first pressing position M1 and the first release position N1, and bends the metal plate. Is formed. A gripping portion (not shown) that is gripped by the user seated on the seat chair 90 when operating the first toggle link mechanism 22 is attached to the distal end portion of the operating rod 30 with bolts or rivets. Therefore, a plurality of bolts or rivet insertion holes 30a are formed in the distal end portion of the operating rod 30. On the other hand, the first output toggle link 24 of the first toggle link mechanism 22 is integrally formed at the base end portion of the operating rod 30 as described above.

  Further, the operating rod 30 is constantly urged in the direction in which the first pressing pin 23 moves toward the first pressing position M1 by the urging force of the first urging spring 35 as the first urging member. That is, as shown in FIG. 3, the first urging spring 35 is a tension coil spring, and one end (upper end) 35 a of the locking rod 30 b is formed by bending at the intermediate portion in the length direction of the operating rod 30. It is locked to. The other end (lower end) 35b of the first biasing spring 35 is locked to the head of the second pivot pin 32 so that the first biasing spring 35 is always in a tension state. Accordingly, the operating rod 30 is constantly urged in the direction in which the first pressing pin 23 moves toward the first pressing position M1 by the urging force accumulated in the first urging spring 35. In the first embodiment, the biasing direction of the operating rod 30 by the first biasing spring 35 is the downward direction.

  Next, the configuration of the angle adjuster (that is, the left angle adjuster) 70 of the present embodiment will be described below.

  As shown in FIGS. 6A and 6B, the angle adjuster 70 includes a first arm 71, a second arm 80, a rotary shaft 87, a second biasing spring 88 as a second biasing member, and the like.

  The first arm 71 and the second arm 80 are both made of metal, and more specifically, steel. The first arm 71 and the second arm 80 are connected to each other so that the second arm 80 can rotate in the forward rotation direction S and the reverse rotation direction G relative to the first arm 71. .

  The first arm 71 includes a cylindrical attachment portion 72 attached to the rear end portion of the left side frame portion 91 a of the seat frame 91. 1 and 2, the rear end portion of the left frame portion 91a of the seat frame 91 is inserted into the attachment portion 72. In this state, the rear end portion of the left frame portion 91a is attached to the attachment portion 72 by rivets. It is attached. Therefore, a rivet insertion hole 72 a is formed in the attachment portion 72. Note that the method of attaching the left side frame portion 91a to the attachment portion 72 is not limited to riveting, but may be, for example, caulking or welding.

  As shown in FIGS. 6A and 6B, a pair of left and right outer plate portions 73 and 73 that are spaced apart from each other in the left and right directions L and R in parallel with each other and the both outer plate portions 73 are disposed at the base end portion of the mounting portion 72. , 73 are integrally formed with a bottom plate portion 74 that connects the lower ends of the outer plate portions 73, and an upper plate portion 75 that connects the upper ends of the outer side plate portions 73, 73 with each other. The left and right directions L and R of the angle adjuster 70 coincide with the thickness direction T of the angle adjuster 70, and also coincide with the axial direction of the rotation shaft 87. As shown in FIG. 6B, each outer plate 73 is provided with a rotary shaft hole 73a having a circular cross section.

  The second arm 80 is configured by integrally combining a pair of left and right second arm constituent pieces 80a and 80a. In a state before the combination of the two component pieces 80a and 80a, a plurality of fitting convex portions 80b that can be fitted to each other for preventing displacement between the two component pieces 80a and 80a are provided on the combination surface of the component pieces 80a. And the fitting hole 80c is formed. And the 2nd arm 80 is formed by combining both component pieces 80a and 80a mutually.

  Further, the second arm 80 includes a cylindrical attachment portion 81 attached to the lower end portion of the left frame portion 92a of the back frame 92. 1 and 2, the attachment portion 81 is inserted into the connection socket 92b at the lower end portion of the left frame portion 92a of the back frame 92. In this state, the lower end portion of the left frame portion 92a is attached to the attachment portion 81. It is attached by a plurality of rivets through the connection socket 92b. Therefore, a plurality of rivet insertion holes 81 a are formed in the attachment portion 81. Note that the method of attaching the left frame portion 92a to the attachment portion 81 is not limited to riveting, but may be, for example, caulking or welding.

  As shown in FIGS. 6A and 6B, a substantially circular or substantially semicircular rotating plate portion 82 is integrally formed at the base end portion of the mounting portion 81, so that the rotating plate portion 82 is formed into the second arm 80. The second arm 80 and the second arm 80 are rotatably provided. Further, a boss portion 83 having a circular cross section projecting to both sides in the thickness direction of the rotating plate portion 82 is integrally formed at a substantially central portion of the rotating plate portion 82. The boss portion 83 does not correspond to the rotating shaft portion 13 of the angle adjuster 60 of the first embodiment, and reduces the contact area between the rotating plate portion 82 of the second arm 80 and the inner surface of each outer plate portion 73. It functions as a convex part for making it happen. A central axis of the boss 83 is provided with a rotary shaft fitting hole 84 having a hexagonal cross section as a convex polygonal cross section.

  The rotation shaft 87 has a base end side portion 87 a formed in a hexagonal cross section corresponding to the cross sectional shape of the rotation shaft fitting hole 84, and a distal end side portion 87 b formed in a circular cross section. The diameter of the distal end side portion 87b is set slightly smaller than the proximal end side portion 87a. And the rotating plate part 82 of the 2nd arm 80 is arrange | positioned between the both outer side board parts 73 and 73 of the 1st arm 71, and the rotating shaft 87 is the rotating shaft hole 73a of both the outer side board parts 73 and 73 in this state, 73 a and the rotation shaft fitting hole 84 of the second arm 80 are communicated and inserted. The distal end side portion 87 b of the rotating shaft 87 protrudes outside the outer plate portion 73. The base end side portion 87a of the rotating shaft 87 is fitted into the rotating shaft fitting hole 84 of the second arm 80, and thereby the rotating shaft 87 is attached to the second arm 80 so as to be rotatable together with the second arm 80. It has been. That is, when the second arm 80 rotates in the forward rotation direction S and the reverse rotation direction G, the rotation shaft 87 rotates in the forward rotation direction S and the reverse rotation direction G in the rotation shaft hole 73a. Yes.

  The second urging spring 88 urges the second arm 80 in the forward rotation direction S, thereby further adjusting the back frame 92 and the second angle adjuster (that is, the right angle adjuster) 60 of the first embodiment. The arm 10 is urged in the forward rotation direction S. The configuration of the second biasing spring 88 is as follows.

  The second urging spring 88 is a mainspring spring (spiral spring). One end portion 88 a on the center side of the second urging spring 88 is inserted into and locked in a locking groove 87 c formed in the distal end side portion 87 b of the rotating shaft 87. The other end 88 b outside the second urging spring 88 is locked to a locking protrusion 77 provided in a fixed state on the outer plate 73 of the first arm 71.

  The locking projection 77 is made of rivets. Then, the locking projection 77 is inserted through the insertion hole 73b formed in each outer plate 73 of the first arm 71, and its tip is crushed into a large diameter. The part 77 is attached to the outer plate part 73 of the first arm 71 in a fixed state. As described above, the second urging spring 88 is installed on the rotation shaft 87 and the first arm 71, so that the urging force of the second urging spring 88 is applied to the back frame 92 via the rotation shaft 87 and the second arm 80. Furthermore, it acts on the second arm 10 of the angle adjuster 60 of the first embodiment in the forward rotation direction S. That is, the rotation shaft 87 is constantly urged in the forward rotation direction S by the urging force of the second urging spring 88, and thereby the second arm 80 is always urged in the forward rotation direction S. The back frame 92 and the second arm 10 of the angle adjuster 60 of the first embodiment are always urged in the forward rotation direction S.

  When the back frame 92 is rotated in the reverse rotation direction G, the rotation shaft 87 is rotated in the reverse rotation direction G. As a result, the second urging spring 88 is wound in the reverse rotation direction G from one end portion 88 a thereof, and the urging force in the forward rotation direction S is accumulated in the second urging spring 88.

  Next, the detailed configuration of the first toggle link mechanism 22 of the angle adjuster 60 and the operation of the angle adjuster 60 according to the first embodiment will be described below with reference to FIGS.

  In the following description, in the first toggle link mechanism 22, “inside the first reference line C1” means the center side of the first toggle link mechanism 22 with respect to the first reference line C1. The “outside with respect to the first reference line C1” means the side opposite to the center side of the first toggle link mechanism 22 with respect to the first reference line C1.

  Further, the winding members 6 and 6 perform the same operation.

  In the angle adjuster 60 shown in FIG. 9A, the second arm 10 is disposed at a position of, for example, about 135 ° as an arbitrary deployment angle θ with respect to the first arm 1. The operating rod 30 is disposed at the neutral position against the urging force of the first urging spring 35 (see FIG. 3). In a state where the operating rod 30 is disposed at this neutral position, the first pressing pin 23 is disposed between the first pressing position M1 illustrated in FIG. 9B and the first release position N1 illustrated in FIG. 9D. .

  In the first toggle link mechanism 22, the toggle pin 26 (specifically, its axis W) is located outside the first reference line C1. The first output toggle link 24 (its link line L1) and the swing toggle link 25 (its link line L2) are bent in a convex shape at the position of the toggle pin 26. Therefore, the angle between the first output toggle link 24 and the swing toggle link 25 is smaller than 180 °.

  The outer peripheral surface 13 a of the rotating shaft portion 13 of the second arm 10 is always in a state of being tightened by the winding portion 7 by the spring elastic force of the winding member 6.

  In this state, the angle adjuster 60 operates in the same manner as the conventional angle adjuster 160 shown in FIGS. 15A and 15B.

  That is, as the load SK in the forward rotation direction S of the second arm 10, for example, the biasing force in the forward rotation direction S of the second biasing spring 88 of the angle adjuster 70 (see FIG. 6A) of the reference embodiment is the back frame 92. , The second arm 10 tries to rotate in the normal rotation direction S around the rotation shaft portion 13. By such a rotation operation in the positive rotation direction S, the frictional force SM in the positive rotation direction S is applied to the contact portion 8 between the outer peripheral surface 13a of the rotating shaft portion 13 and the inner peripheral surface 7c of the tightening portion 7 of the tightening member 6. The frictional force SM is generated and acts on the tightening member 6 (more specifically, the tightening portion 7 of the tightening member 6) in the loosening direction U with respect to the outer peripheral surface 13a of the rotating shaft portion 13. Then, the winding member 6 causes the first end 6a and the second end 6b (specifically, the first pivot pin 31 and the second pivot pin 32) to be fixed ends (detailed) by this frictional force SM. As the rotation end), the winding part 7 is elastically slightly deformed in the loosening direction U so that the inner diameter of the tightening portion 7 increases. Thereby, the winding force of the winding member 6 to the outer peripheral surface 13a of the rotating shaft part 13 decreases, and as a result, the rotation of the second arm 10 in the positive rotation direction S is allowed. Therefore, in the state of FIG. 9A, the second arm 10 can rotate in the forward rotation direction S.

  “◯” in FIG. 9A indicates that the rotation of the second arm 10 in the positive rotation direction S is permitted.

  On the other hand, when a load GK in the reverse rotation direction G is applied to the second arm 10 (back frame 92), the second arm 10 tries to rotate in the reverse rotation direction G around the rotation shaft portion 13. By such a rotation operation in the reverse rotation direction G, the frictional force GM in the reverse rotation direction G is applied to the contact portion 8 between the outer peripheral surface 13a of the rotation shaft portion 13 and the inner peripheral surface 7c of the tightening portion 7 of the tightening member 6. The frictional force GM is generated and acts on the winding member 6 (more specifically, the winding portion 7 of the winding member 6) in the winding direction V with respect to the outer peripheral surface 13a of the rotary shaft portion 13. Then, the winding member 6 causes the first end 6a and the second end 6b (specifically, the first pivot pin 31 and the second pivot pin 32) to be fixed ends (detailed) by this frictional force GM. As the rotation end), it is slightly elastically deformed in the winding direction V so that the inner diameter of the winding portion 7 decreases. Thereby, the winding force of the winding member 6 to the outer peripheral surface 13a of the rotating shaft part 13 increases, As a result, rotation of the 2nd arm 10 in the reverse rotation direction G is blocked | prevented. Therefore, in the state of FIG. 9A, the second arm cannot rotate in the reverse rotation direction G.

  “X” in FIG. 9A indicates that the rotation of the second arm 10 in the reverse rotation direction G is prevented.

  In the angle adjuster 60 in the state of FIG. 9A, a user (not shown) sitting on a seat chair prevents the operation rod 30 from rotating in the forward rotation direction S of the second arm 10 with his / her hand. 9B, the first output toggle link 24 in the first toggle link mechanism 22 is directed toward the first reference line C1 with the first pressing pin 23 as the center. As a result, the toggle pin 26 (its axis W) moves from the position outside the first reference line C1 to the first reference line C1 or a position slightly inside the first reference line C1. At this position, the toggle pin 26 strikes the first end 6x of the long hole 6i of the winding member 6 and the movement of the toggle pin 26 is stopped. In the first embodiment, the toggle pin 26 (its axial center W) hits the first end 6x of the long hole 6i when moved to a position slightly inward with respect to the first reference line C1. The movement has been stopped.

  Along with such movement of the toggle pin 26, the first output toggle link 24 (its link line L1) and the swing toggle link 25 (its link line L2) gradually expand so that the angle between them increases. With this extension operation, the first guide link 27 (the link line thereof) moves so that the first pressing pin 23 moves in the direction of the arrow A1 toward the first pressing position M1 in the first operation hole 6g of the winding member 6. L3). When the toggle pin 26 hits the first end 6x of the long hole 6i and the movement of the toggle pin 26 is stopped, the first output toggle link 24 (the link line L1) and the swing toggle link 25 (the link) Line L2) extends substantially in a straight line, and in this state, the first pressing pin 23 (its axial center Q1) is disposed at the first pressing position M1, and the first output toggle link 24 and the swing toggle The link 25 is held in a substantially extended state.

  In this first pressing position M1, the first pressing pin 23 (its axial center Q1) is a part of the inner peripheral surface of the first operating hole 6g of the winding member 6 and a portion 6ga on the first pressing position M1 side on the inner peripheral surface. (See FIG. 7). Here, as viewed in the axial direction of the rotary shaft portion 13, the portion 6 ga of the inner peripheral surface of the first operation hole 6 g is tightened in the winding member 6 by the first pressing pin 23 pressing the portion 6 ga. The first pressing pin 23 is formed substantially perpendicular to the moving direction A1 to the first pressing position M1 so that the pressing force B1 of V acts. Therefore, when the first pressing pin 23 moving in the moving direction A1 is disposed at the first pressing position M1, the first pressing pin 23 presses the winding member 6 in the winding direction V. As a result, the winding member 6 is slightly elastically deformed in the winding direction V so that the inner diameter of the winding portion 7 is reduced, and the winding force of the winding member 6 on the outer peripheral surface 13a of the rotary shaft portion 13 is reduced. To increase. As a result, the second arm 10 is blocked not only in the reverse rotation direction G but also in the forward rotation direction S, that is, the second arm 10 is locked so as not to rotate in both the forward and reverse rotation directions S and G. The

  Therefore, in the state of FIG. 9B, for example, the urging force in the positive rotation direction S of the second urging spring 88 of the angle adjuster 70 of the reference embodiment is the back frame as the load SK in the positive rotation direction S of the second arm 10. Even when the second arm 10 is applied to the second arm 10 via 92 and the load SK in the positive rotation direction S is inadvertently applied to the second arm 10 (or the back frame 92), the second arm 10 is in the positive rotation direction. Do not rotate to S.

  “X” in FIG. 9B indicates that the rotation of the second arm 10 in the forward rotation direction S and the rotation in the reverse rotation direction G are blocked.

  In the angle adjuster 60 in the state of FIG. 9B, when a large load GK in the reverse rotation direction G is applied to the second arm 10 (or the back frame 92), as shown in FIG. 9C, the winding direction of the winding member 6 The deformation amount of V increases, and the inner peripheral surface of the restriction hole 14 of the second arm 10 strikes the restriction member 3f. Thereby, the deformation amount of the winding member 6 in the winding direction V is regulated. If a very large load GK in the reverse rotation direction G is applied to the second arm 10 (or the back frame 92) in this state, the outer peripheral surface 13a of the rotating shaft portion 13 is tightened by the winding member 6. Slip rotation is performed in the reverse rotation direction G with respect to the inner peripheral surface 7c of the portion 7, so that an excessive load is not applied to the winding member 6. Thereby, the winding member 6 is not plastically deformed in the winding direction V, and damage to the winding member 6 due to an excessive load applied to the winding member 6 is also suppressed. Further, since the winding member 6 is not plastically deformed, if the large load GK in the reverse rotation direction G is not applied to the second arm 10 (or the back frame 92), the winding member 6 has its own spring elasticity. Returns to the initial position (initial state) by force and operates normally.

  In the angle adjuster 60 in the state of FIG. 9B, the first biasing spring 35 is moved upward in the direction in which the user releases the blocking of the rotation of the second arm 10 in the positive rotation direction S with his / her hand. 9D, the first output toggle link 24 (its link line L1) is centered on the first pressing pin 23 with respect to the first reference line C1, as shown in FIG. 9D. As a result, the toggle pin 26 (its axial center W) moves to a position outside the first reference line C1.

  The first output toggle link 24 (the link line L1) and the swinging toggle link 25 (the link line L2) are moved to the position of the toggle pin 26 so that the angle between the two decreases with the movement of the toggle pin 26. The first guide link 27 is gradually bent into a convex shape and the first pressing pin 23 moves in the direction of the arrow A2 from the first pressing position M1 toward the first release position N1 in accordance with the bending operation. Guided by (link line L3). And when the 1st press pin 23 (its axial center Q1) is arrange | positioned in the 1st cancellation | release position N1, the 1st press pin 23 is another part of the internal peripheral surface of the 1st operation hole 6g of the winding member 6. As shown in FIG. 7, the first release position N1 side portion 6gb (see FIG. 7) of the inner peripheral surface is pressed, and the toggle pin 26 abuts against the second end 6y of the long hole 6i of the winding member 6.

  Here, as viewed in the axial direction of the rotary shaft portion 13, the other portion 6 gb of the inner peripheral surface of the first operation hole 6 g is tightened by the first pressing pin 23 pressing the other portion 6 gb. The first pressing pin 23 is formed to be inclined with respect to the moving direction A2 to the first release position N1 so that the pressing force B2 in the loosening direction U acts on the member 6. Accordingly, when the first pressing pin 23 moving in the moving direction A2 is disposed at the first release position N1, the first pressing pin 23 loosens the winding member 6 and presses it in the direction U. Thereby, the winding member 6 is elastically slightly deformed in the loosening direction U so that the inner diameter of the winding portion 7 is increased, and the winding force of the winding member 6 on the outer peripheral surface 13a of the rotary shaft portion 13 is reduced. To do. As a result, the prevention of the rotation of the second arm 10 in the reverse rotation direction G by the winding member 6 is released, and the second arm 10 is allowed not only to rotate in the normal rotation direction S but also in the reverse rotation direction G. Is done.

  Therefore, in the state of FIG. 9D, for example, the biasing force in the positive rotation direction S of the second biasing spring 88 of the angle adjuster 70 of the reference embodiment is the back frame as the load SK in the positive rotation direction S of the second arm 10. By applying to the second arm 10 via 92, the second arm 10 rotates in the normal rotation direction S. Further, when adjusting the deployment angle θ of the second arm 10 (back frame 92) relative to the first arm 1 (seat frame 91), a load GK in the reverse rotation direction G is applied to the second arm 10 to thereby adjust the second arm 10 10 rotates in the reverse rotation direction G. Therefore, the deployment angle θ of the second arm 10 (back frame 92) can be easily adjusted.

  In the state shown in FIG. 9D, the first pressing pin 23 does not hinder the deformation in the loosening direction U of the tightening member 6, and the loosening direction of the tightening member 6 on the inner peripheral surface of the first operation hole 6g. There is no contact with the portion opposite to U (substantially lower portion of the inner peripheral surface in the first embodiment).

  “◯” in FIG. 9D indicates that rotation of the second arm 10 in the forward rotation direction S and rotation in the reverse rotation direction G are permitted.

  In the angle adjuster 60 in the state of FIG. 9D, when the user releases the operation rod 30 with his / her hand further against the urging force of the first urging spring 35, as shown in FIG. 9E. The toggle pin 26 moves further outward with respect to the first reference line C1 in a state where it abuts against the second end 6y of the elongated hole 6i of the winding member 6 (the moving direction A3), and the toggle pin 26 is moved. The second end 6 y of the long hole 6 i is pressed in the loosening direction U of the winding member 6. Accordingly, the winding member 6 is further elastically deformed in the loosening direction U so that the inner diameter of the winding portion 7 is further increased, and the winding force of the winding member 6 on the outer peripheral surface 13a of the rotary shaft portion 13 is increased. Further decrease. As a result, the prevention of the rotation of the second arm 10 in the reverse rotation direction G is reliably released, and the second arm 10 is reliably allowed not only to rotate in the normal rotation direction S but also in the reverse rotation direction G. The

  Therefore, in the state of FIG. 9E, the urging force in the positive rotation direction S of the second urging spring 88 of the angle adjuster 70 of the reference embodiment is, for example, the load SK of the second arm 10 in the positive rotation direction S. By adding to the second arm 10 via 92, the second arm 10 easily rotates in the forward rotation direction S. Furthermore, when adjusting the deployment angle θ of the second arm 10 (back frame 92) with respect to the first arm 1 (seat frame 91), a load GK in the reverse rotation direction G is applied to the second arm 10 to thereby adjust the second arm 10 10 easily rotates in the reverse rotation direction G. Therefore, the adjustment of the deployment angle θ of the second arm 10 (back frame 92) can be performed more easily.

  “◯” in FIG. 9E indicates that the rotation of the second arm 10 in the forward rotation direction S and the rotation in the reverse rotation direction G are permitted.

  In the state of FIG. 9E, each winding member 6 strikes the lower surface of the upper plate portion 5 of the first arm 1, thereby restricting the amount of deformation of each winding member 6 in the loosening direction U.

  In the angle adjuster 60 in the state of FIG. 9D or 9E, when the user removes his / her hand from the operating rod 30, the operating rod 30 is moved to the position shown in FIG. 9A by the biasing force of the first biasing spring 35 and to the position shown in FIG. It automatically returns to an intermediate position from the indicated position.

  Here, the above-described operation of the first toggle link mechanism 22 by the operating rod 30 cannot be performed only when the deployment angle θ of the second arm 10 with respect to the first arm 1 is about 135 °. This can be performed at all the deployment angle positions within the adjustable range of the ten deployment angles θ.

  9D and 9E, the angle adjuster 60 in the state shown in FIGS. 9D and 9E is rotated by the second arm 10 in the forward rotation direction S so that the deployment angle θ of the second arm 10 with respect to the first arm 1 is the minimum deployment angle of about 90. When the angle reaches, the front edge protrusion 12a of the rotary plate portion 12 of the second arm 10 abuts against the rear end 5a of the upper plate portion 5 of the first arm 1, thereby further correcting the second arm 10. The rotation in the rotation direction S is restricted. On the other hand, when the second arm 10 is largely rotated in the reverse rotation direction G and the deployment angle θ of the second arm 10 with respect to the first arm 1 reaches about 180 ° which is the maximum deployment angle, the rotating plate of the second arm 10 The rear edge protrusion 12b of the portion 12 abuts against the rear end 4a of the bottom plate portion 4 of the first arm 1, thereby restricting further rotation of the second arm 10 in the reverse rotation direction G.

  The angle adjuster 60 of the first embodiment has the following advantages.

  Since the angle adjuster 60 includes the forward rotation blocking means 20, the second arm 10 can be positively moved at an arbitrary deployment angle θ within an adjustable range of the deployment angle of the second arm 10 relative to the first arm 1. The rotation in the rotation direction S can be blocked by the normal rotation blocking means 20. Therefore, even when the load SK in the forward rotation direction S is inadvertently applied to the second arm 10, the rotation of the second arm 10 in the forward rotation direction S can be blocked by the forward rotation blocking means 20. The deployment angle θ of the second arm 10 relative to the arm 1 can be maintained.

  Further, the forward rotation preventing means 20 has a first pressing pin 23 as the first pressing portion 21, and the first pressing pin 23 presses the winding member 6 in the winding direction V, so that the second arm 10 can move. Since the rotation in the forward rotation direction S is prevented, the rotation of the second arm 10 in the forward rotation direction S can be reliably prevented.

  Since the forward rotation blocking means 20 includes the first toggle link mechanism 22 and its operating rod 30, an operation of placing the first pressing pin 23 at the first pressing position M1, that is, the forward rotation direction S of the second arm 10 is performed. The operation for preventing the rotation of the lens can be performed with a small force, and the blocking operation can be easily performed.

  In the first toggle link mechanism 22, when the first output toggle link 24 (the link line L1) and the swing toggle link 25 (the link line L2) are substantially extended, the first pressing pin 23 is in the first pressing position. Since it is configured to be disposed at M1, the operation for disposing the first pressing pin 23 at the first pressing position M1, that is, the operation for preventing the rotation of the second arm 10 in the positive rotation direction S is surely performed with a small force. The blocking operation can be performed easily and reliably.

  Further, since the first toggle link mechanism 22 includes the first guide link 27 (the link line L3), the first pressing pin 23 is reliably disposed at the first pressing position M1 and the first release position N1, respectively. be able to.

  Since the first pressing pin 23 is inserted through the first operation hole 6g provided in the winding member 6, the first toggle link mechanism 22 can be reduced in size, and the angle adjuster 60 can be reduced in size. Can be planned. Furthermore, the winding member 6 can be reliably pressed in the winding direction V by the first pressing pin 23 when the first pressing pin 23 is disposed at the first pressing position M1. Thereby, the rotation of the second arm 10 in the positive rotation direction S can be reliably prevented.

  Further, the first toggle link mechanism 22 is configured such that when the first pressing pin 23 is disposed at the first release position N1, the first pressing pin 23 presses another portion 6gb on the inner peripheral surface of the first operation hole 6g. Thus, the first pressing pin 23 is configured to loosen the winding member 6 and press it in the direction U. Therefore, when the first pressing pin 23 is disposed at the first release position N1, the winding member 6 can be loosened and reliably pressed in the direction U by the first pressing pin 23. Thereby, prevention of the rotation of the second arm 10 in the reverse rotation direction G can be reliably released.

  The first arm 1 via a first pivot pin 31 in which the first end 6a (first insertion hole 6c) of the winding member 6 and the other end (insertion hole 27b) of the first guide link 27 are common to each other. Therefore, the number of parts constituting the angle adjuster 60 can be reduced. Thereby, the size of the angle adjuster 60 can be further reduced, and the manufacturing cost of the angle adjuster 60 can be reduced.

  The second arm 6b (second insertion hole 6d) of the winding member 6 and the other end (insertion hole 25b) of the swing toggle link 25 are connected to each other via the second pivot pin 32 that is common to the first arm 1. The number of parts constituting the angle adjuster 60 can be further reduced. As a result, the angle adjuster 60 can be further reduced in size, and the manufacturing cost of the angle adjuster 60 can be further reduced.

  Since the toggle pin 26 is inserted into the long hole 6i provided in the tightening member 6, the first toggle link mechanism 22 can be further reduced in size, and the angle adjuster 60 can be further reduced in size. be able to.

  Further, the first end 6x of the long hole 6i stops the movement of the toggle pin 26 when the first output toggle link 24 (the link line L1) and the swing toggle link 25 (the link line L2) are substantially extended. Therefore, the movement of the toggle pin 26 is stopped at the first end 6x of the long hole 6i, so that the first output toggle link 24 and the swing toggle link 25 are securely held in the substantially extended state. be able to. Therefore, when the first output toggle link 24 (the link line L1) and the swing toggle link 25 (the link line L2) are substantially extended, the load in the positive rotation direction S is applied to the back frame 92 (first arm 10). Even when SK is added, the first pressing pin 23 can be held at the first pressing position M1. Therefore, the rotation of the second arm 10 in the positive rotation direction S can be more reliably prevented.

  Further, as shown in FIG. 9E, the first toggle link mechanism 22 is configured so that the toggle pin 26 loosens the second end 6y of the long hole 6i in the direction U when the first pressing pin 23 is disposed at the first release position N1. Since it is configured to press, the prevention of the rotation of the second arm 10 in the positive rotation direction S can be reliably released.

  Since the operating rod 30 is provided integrally with the first output toggle link 24 so that the first output toggle link 24 operates integrally with the operation operation of the operating rod 30, the first pressing of the first toggle link mechanism 22 is performed. The operation of disposing the pin 23 at the first pressing position M1, that is, the operation of preventing the rotation of the second arm 10 in the positive rotation direction S can be reliably performed, and the first pressing pin 23 is moved to the first release position N1. The operation of disposing the second arm 10 in the forward rotation direction S can be reliably performed.

  The operating rod 30 is urged in the direction in which the first pressing pin 23 moves toward the first pressing position M1 by the urging force of the first urging spring 35 as the first urging member. The operation of disposing 23 at the first pressing position M1, that is, the operation of preventing the rotation of the second arm 10 in the forward rotation direction S can be easily performed.

  Since the second arm 10 is urged in the forward rotation direction S via the back frame 92 by the urging force of the second urging spring 88 of the angle adjuster 70 of the above-described reference embodiment, the second rotation is prevented by the forward rotation preventing means 20. When the blocking of the rotation of the two arms 10 in the forward rotation direction S is released, the second arm 10 (back frame 92) is automatically rotated in the forward rotation direction S by the biasing force of the second biasing spring 88. As a result, the user sitting on the seat chair 90 can adjust the deployment angle θ of the back frame 92 with his / her back. Therefore, the deployment angle θ of the second arm 10 (back frame 92) can be easily adjusted.

  Since the swing toggle link 25 and the first guide link 27 are disposed between the winding fastening members 6 and 6, rattling is unlikely to occur during the operation of the links 25 and 27. Therefore, the operation of the first toggle link mechanism 22 is performed smoothly.

  In the seat 90, only the right angle adjuster of the left and right angle adjusters 60 and 70 is the angle adjuster 60 of the first embodiment, and the left of the left and right angle adjusters 60 and 70 is the left. In the angle adjuster 70, the second arm 80 is urged in the rotational direction in which the deployment angle of the second arm 80 with respect to the first arm 71 is reduced by the urging force of the second urging spring 88 as the second urging member. Therefore, the deployment angle of the back frame 92 (second arm 80) with respect to the seat frame 91 (first arm 71) can be easily adjusted. Furthermore, since it is not necessary to provide a biasing member that biases the second arm 10 in the forward rotation direction S in the angle adjuster 60 of the first embodiment, the structure of the angle adjuster 60 can be simplified. In addition, the angle adjuster 60 can be downsized.

Second Embodiment
10A to 12C are views for explaining an angle adjuster 60A according to the second embodiment of the present invention. In these drawings, the same reference numerals are given to components equivalent to those of the angle adjuster 60 of the first embodiment. In the following, the configuration of the angle adjuster 60A of the second embodiment will be described focusing on the differences from the angle adjuster 60 of the first embodiment.

  The appearance (see FIG. 10D) of the angle adjuster 60A of the second embodiment is the same as the angle adjuster 60 (see FIG. 5C) of the first embodiment, but the angle adjuster 60A of the second embodiment is the same. In addition to the components of the angle adjuster 60 of the first embodiment, a release means 40 is further provided.

  As shown in FIGS. 12A to 12C, the release means 40 has a second pressing pin 43 as the second pressing portion 41, and has a second position at an arbitrary deployment angle θ of the second arm 10 with respect to the first arm 1. When the 2 pressing pin 43 presses the winding member 6A in the loosening direction U, the blocking of the rotation of the second arm 10 in the reverse rotation direction G by the winding member 6A is released.

  The release means 40 includes the second toggle link mechanism 42 and the operation rod 30 for performing the above-described operation.

  The second toggle link mechanism 42 has the second pressing pin 43 provided at the output end of the second toggle link mechanism 42, the second pressing position M2 shown in FIG. 12C and the second release position shown in FIG. 12B. It moves between N2.

  The second pressing position M2 is a position where the second pressing pin 43 presses the winding member 6A in the loosening direction U as shown in FIG. 12C.

  The second release position N2 is a position where the pressing in the loosening direction U of the winding member 6A by the second pressing pin 43 is released as shown in FIG. 12B.

  As shown in FIG. 12A, the second toggle link mechanism 42 includes a second output toggle link 44, a swing toggle link 25 of the first toggle link mechanism 22, a toggle pin 26 of the first toggle link mechanism 22, The second pressing pin 43 and the second guide link 45 are provided. That is, the swing toggle link 25 and the toggle pin 26 are shared by the first toggle link mechanism 22 and the second toggle link mechanism 42. Thereby, the number of parts which comprise angle adjuster 60A can further be reduced.

  The second output toggle link 44 is made of a metal second output toggle link member, and the second guide link 45 is made of a metal second guide link member.

  The operating rod 30 operates to operate the first toggle link mechanism 22 as described in the first embodiment, and the second pressing pin 43 is located between the second pressing position M2 and the second releasing position N2. The second toggle link mechanism 42 is operated so as to move.

  As shown in FIG. 10A, the second pressing pin 43 has a circular cross section.

  As shown in FIGS. 10B and 10C, the second output toggle link 44, the first swing toggle link 25, the first guide link 27, the second guide link 45, and the second pressing pin 43 include both winding fastening members 6 </ b> A. , 6A.

  As shown in FIG. 12A, one end of the second output toggle link 44 is pivotally supported by the toggle pin 26. That is, as shown in FIG. 10A, an insertion hole 44a for a toggle pin 26 is formed at one end of the second output toggle link 44. The cross-sectional shape of the insertion hole 44 a is a circular shape corresponding to the cross-sectional shape of the toggle pin 26. Then, the toggle pin 26 is inserted into the insertion hole 44a. As a result, as shown in FIG. 12A, one end portion (insertion hole 24a) of each first output toggle link 24 and one end portion (insertion) of the swing toggle link 25 are inserted. The hole 25 a) and one end of the second output toggle link 44 (insertion hole 44 a) are pivotally connected to each other via the toggle pin 26. In other words, the toggle pin 26 includes one end portion (insertion hole 24a) of the first output toggle link 24, one end portion (insertion hole 25a) of the swing toggle link 25, and one end portion (insertion hole 44a) of the second output toggle link 44. Are pivotally attached to each other.

  The other end of the second output toggle link 44 corresponds to the output end of the second toggle link mechanism 42. 10B and 12A, the other end portion of the second output toggle link 44 and one end portion as the swing end portion of the second guide link 45 are pivotally connected to each other via the second pressing pin 43. ing.

  That is, as shown in FIG. 10A, second pressing pin 43 insertion holes 44 b and 45 a are formed in the other end of the second output toggle link 44 and one end of the second guide link 45, respectively. The cross-sectional shape of each of the insertion holes 44 b and 45 a is a circular shape corresponding to the cross-sectional shape of the second pressing pin 43. The second pressing pin 43 is inserted in communication with these insertion holes 44b and 45a, whereby the other end portion (insertion hole 44b) of the second output toggle link 44 as shown in FIGS. 10B and 12A. And one end (insertion hole 45a) of the second guide link 45 are pivotally attached to each other via the second pressing pin 43. In other words, the second pressing pin 43 pivots the other end portion (insertion hole 44 b) of the second output toggle link 44 and one end portion (insertion hole 45 a) of the second guide link 45.

  The second guide link 45 is second so that the second pressing pin 43 (its axial center Q2) moves between the second pressing position M2 (see FIG. 12C) and the second release position N2 (see FIG. 12B). The pressing pin 43 is guided.

  Furthermore, as shown in FIGS. 10A to 10C, the second pressing pin 43 is disposed in a second operation hole 6h formed in the long side portion 6e of each winding member 6A (see FIG. 11). The second pressing pin 43 has both axial ends abutting against the inner surfaces of the outer plate portions 3 and 3 of the first arm 1, whereby the axial movement of the second pressing pin 43 is performed on the outer plate portions 3. 3 is regulated.

  The second operation hole 6h of each winding member 6A is formed to be larger than the cross-sectional dimension of the second pressing pin 43, and the detailed configuration thereof will be described later.

  The other end as a base end of the second guide link 45 is pivotally supported by the first pivot pin 31. That is, as shown in FIG. 10A, the insertion hole 45 b for the first pivot pin 31 is formed in the other end portion of the second guide link 45. The cross-sectional shape of the insertion hole 45 b is a circular shape corresponding to the cross-sectional shape of the first pivot pin 31. The first pivot pin 31 is inserted into the insertion hole 45b, whereby the other end portion of the first guide link 27 (insertion hole 27b) and the other end portion of the second guide link 45 (insertion hole 45b). And the first end portion 6a (first insertion hole 6c) of each winding member 6A are pivotally attached to both outer side plate portions 3 and 3 of the first arm 1 through a common first pivot pin 31. .

  The first pivot pin 31, the second pivot pin 32, the first pressing pin 23 (its axis Q1), the second pressing pin 43 (its axis Q2) and the toggle pin 26 (its axis W). The center direction is parallel to the axis J direction of the rotation shaft portion 13.

  12A to 12C, “L5” is a link line of the second output toggle link 44, and “L6” is a link line of the second guide link 45.

  The other end of the second output toggle link 44 (specifically, the axial center Q2 of the second pressing pin 43) and the other end of the swing toggle link 25 (specifically, the first output toggle link 44) A straight line C2 connecting the second pivot attachment position P2), which is the axis of the two pivot attachment pins 32, is defined as a “second reference line C2”.

  Next, with respect to the detailed configuration of the second toggle link mechanism 42 of the angle adjuster of the second embodiment and the operation of the angle adjuster 60A, FIGS. 12A to 12C are mainly shown with respect to the differences from the first embodiment. This will be described below with reference.

  In the following description, as in the first embodiment, in the first toggle link mechanism 22, “inside the first reference line C1” means “the first toggle link mechanism 22 with respect to the first reference line C1”. The “outside of the first reference line C1” means the side opposite to the center side of the first toggle link mechanism 22 with respect to the first reference line C1. In the second toggle link mechanism 42, “inside the second reference line C2” means the center side of the second toggle link mechanism 42 with respect to the second reference line C2. The “outside with respect to the reference line C2” means the side opposite to the center side of the second toggle link mechanism 42 with respect to the second reference line C2.

  In the angle adjuster 60 </ b> A shown in FIG. 12A, the second arm 10 is arranged at an arbitrary deployment angle θ with respect to the first arm 1, for example, at a position of about 135 °. The operating rod 30 is disposed at the neutral position against the biasing force of the first biasing spring 35. In a state where the operating rod 30 is disposed at this neutral position, the first pressing pin 23 is disposed between the first pressing position M1 and the first release position N1. The second pressing pin 43 is disposed between the second pressing position M2 shown in FIG. 12C and the second release position N2 shown in FIG. 12B. In the second embodiment, the second operation hole will be described in detail. It is arranged at a substantially middle part in 6h.

  In the first toggle link mechanism 22, the toggle pin 26 (specifically, its axis W) is located outside the first reference line C1. The first output toggle link 24 (its link line L1) and the swing toggle link 25 (its link line L2) are bent in a convex shape at the position of the toggle pin 26. Therefore, the angle between the first output toggle link 24 and the swing toggle link 25 is smaller than 180 °.

  In the second toggle link mechanism 42, the toggle pin 26 (specifically, its axis W) is located inside the second reference line C2. The second output toggle link 44 (its link line L5) and the swing toggle link 25 (its link line L2) are bent in a concave shape at the position of the toggle pin 26. Therefore, the angle between the second output toggle link 44 and the swing toggle link 25 is greater than 180 °.

  The outer peripheral surface 13a of the rotating shaft portion 13 of the second arm 10 is always in a state of being tightened by the winding portion 7 by the spring elastic force of the winding member 6A.

  The angle adjuster 60A in this state operates in the same manner as the conventional angle adjuster 160 shown in FIGS. 15A and 15B. Therefore, the description of the operation of the angle adjuster 60A in this state is omitted.

  “◯” in FIG. 12A indicates that the rotation of the second arm 10 in the positive rotation direction S is permitted. “X” indicates that the rotation of the second arm 10 in the reverse rotation direction G is prevented.

  In the angle adjuster 60 </ b> A in the state of FIG. 12A, a user (not shown) sitting on a seat chair prevents the operation rod 30 from rotating in the forward rotation direction S of the second arm 10 with his / her hand. When the locking operation is performed in the downward direction, which is the direction, as shown in FIG. 12B, the first toggle link mechanism 22 is similar to the angle adjuster 60 of the first embodiment. It operates so that Q1) is arranged at the first pressing position M1. Accordingly, the first pressing pin 23 presses the winding member 6A in the winding direction V, so that the winding member 6A is elastically slightly deformed in the winding direction V so that the inner diameter of the winding portion 7 is reduced. The tightening force of the tightening member 6A on the outer peripheral surface 13a of the rotating shaft portion 13 increases. As a result, the second arm 10 is blocked not only in the reverse rotation direction G but also in the forward rotation direction S, that is, the second arm 10 is locked so as not to rotate in both the forward and reverse rotation directions S and G. The

  Therefore, in the state of FIG. 12B, the urging force in the positive rotation direction S of the second urging spring 88 of the angle adjuster 70 of the reference embodiment is, for example, the load SK of the second arm 10 in the positive rotation direction S. Even when the second arm 10 is applied to the second arm 10 via 92 and the load SK in the positive rotation direction S is inadvertently applied to the second arm 10 (or the back frame 92), the second arm 10 is in the positive rotation direction. Do not rotate to S.

  “X” in FIG. 12B indicates that the rotation of the second arm 10 in the forward rotation direction S and the rotation in the reverse rotation direction G are blocked.

  Further, in the second toggle link mechanism 42, the second toggle link 26 is moved along with the movement of the toggle pin 26 when the first toggle link mechanism 22 is operated so that the first press pin 23 is arranged at the first press position M1. The second output toggle link 44 (its link line L5) and the swing toggle link 25 (its link line L2) in the link mechanism 42 are gradually bent at the position of the toggle pin 26 so that the angle between them increases. With this bending operation, the second pressing pin 43 is guided by the second guide link 45 (the link line L6) so as to move toward the second release position N2 in the second operation hole 6h.

  When the toggle pin 26 hits the first end 6x of the long hole 6i of the winding member 6A and the movement of the toggle pin 26 is stopped, the first output toggle link 24 (its link line L1) and the swing toggle toggle are stopped. The link 25 (its link line L2) extends substantially in a straight line. In this state, the first pressing pin 23 (its axis Q1) is disposed at the first pressing position M1, and the first output toggle link. 24 and the swing toggle link 25 are held in a substantially extended state. Further, at this time, the second pressing pin 43 is disposed in the second operation hole 6h so as not to press the winding member 6A in the winding direction V or the loosening direction U, that is, the second pressing pin 43 is It arrange | positions in the 2nd cancellation | release position N2 which is the position which canceled the press of the loosening direction U of 6 A of fastening members by the 2nd press pin 43. FIG.

  In the angle adjuster 60 </ b> A in the state of FIG. 12B, the user pushes the operating rod 30 with his hand in the upward direction, which is the direction in which the blocking of the rotation of the second arm 10 in the positive rotation direction S is released. 12C, the second output toggle link 44 rotates toward the second reference line C2 around the second pressing pin 43, as shown in FIG. The toggle pin 26 (its axial center W) moves from the position inside the second reference line C2 to the second reference line C2, or moves slightly outside the second reference line C2, At this position, the toggle pin 26 strikes the second end 6y of the long hole 6i of the winding member 6A, and the movement of the toggle pin 26 is stopped. In the second embodiment, the toggle pin 26 (its axial center W) hits the second end 6y of the long hole 6i when moved to a position slightly outside the second reference line C2, and the toggle pin 26 The movement has been stopped.

  With such movement of the toggle pin 26, the second output toggle link 44 (its link line L5) and the swing toggle link 25 (its link line L2) gradually expand so that the angle between them decreases. With this extension operation, the second pressing link 43 (the link thereof) moves in the direction of the arrow A4 from the second release position N2 toward the second pressing position M2 in the second operation hole 6h. Guided by line L6). When the toggle pin 26 hits the second end 6y of the long hole 6i of the tightening member 6A and the movement of the toggle pin 26 is stopped, the second output toggle link 44 (the link line L2 thereof) and the swing toggle toggle are stopped. The link 25 (its link line L2) extends substantially in a straight line, and in this state, the second pressing pin 43 (its axis Q2) is disposed at the second pressing position M2, and the second output toggle link. 44 and the swing toggle link 25 are held in a substantially extended state.

  In the second pressing position M2, the second pressing pin 43 has a portion 6ha (see FIG. 11) on the inner pressing surface on the second pressing position M2 side as a part of the inner peripheral surface of the second operation hole 6h of the winding member 6A. Pressing. Here, in the axial direction view of the rotary shaft portion 13, the portion 6 ha of the inner peripheral surface of the second operation hole 6 h is loosened in the winding direction 6 U by the second pressing pin 43 pressing the portion 6 ha. The second pressing pin 43 is formed so as to be inclined with respect to the moving direction A4 to the second pressing position M2 so that the pressing force B4 acts. Therefore, when the second pressing pin 43 moving in the moving direction A4 is disposed at the second pressing position M2, the second pressing pin 43 presses the winding member 6A in the loosening direction U. Accordingly, the winding member 6A is elastically slightly deformed in the loosening direction U so that the inner diameter of the winding portion 7 is increased, and the winding force of the winding member 6A on the outer peripheral surface 13a of the rotating shaft portion 13 is reduced. To do. As a result, the blocking of the rotation of the second arm 10 in the reverse rotation direction G by the winding member 6A is released, and the second arm 10 is allowed not only in the normal rotation direction S but also in the reverse rotation direction G. Is done.

  Therefore, in the state of FIG. 12C, the urging force in the positive rotation direction S of the second urging spring 88 of the angle adjuster 70 of the reference embodiment is, for example, the load SK of the second arm 10 in the positive rotation direction S. By applying to the second arm 10 via 92, the second arm 10 rotates in the normal rotation direction S. Further, when adjusting the deployment angle θ of the second arm 10 (back frame 92) relative to the first arm 1 (seat frame 91), a load GK in the reverse rotation direction G is applied to the second arm 10 to thereby adjust the second arm 10 10 rotates in the reverse rotation direction G. Therefore, the deployment angle θ of the second arm 10 (back frame 92) can be easily adjusted.

  “◯” in FIG. 12C indicates that rotation of the second arm 10 in the forward rotation direction S and rotation in the reverse rotation direction G are permitted.

  Further, in the first toggle link mechanism 22, the first toggle link 26 moves when the second toggle link mechanism 42 is operated so that the second press pin 43 is arranged at the second press position M <b> 2. The first output toggle link 24 (its link line L1) and the swing toggle link 25 (its link line L2) in the link mechanism 22 are gradually bent at the position of the toggle pin 26 so that the angle between them decreases. In accordance with the bending operation, the first guide link 27 (its link line L3) is arranged such that the first pressing pin 23 moves from the first pressing position M1 toward the first release position N1 in the first operation hole 6g. It is guided by.

  When the toggle pin 26 hits the second end 6y of the long hole 6i of the tightening member 6A and the movement of the toggle pin 26 is stopped, the first pressing pin 23 is disposed at the first release position N1.

  In the first release position N1, the first pressing pin 23 is arranged in the first operation hole 6g so as not to loosen the winding member 6A in the loosening direction U and the winding direction V. In the present invention, similarly to the angle adjuster 60 of the first embodiment, the first pressing pin 23 presses a predetermined portion of the inner peripheral surface of the first operation hole 6g in the loosening direction U at the first release position N1. As such, it may be disposed in the first operation hole 6g.

  Here, the above-described operation of the first toggle link mechanism 22 and the second toggle link mechanism 42 by the operating rod 30 can be performed only when the deployment angle θ of the second arm 10 relative to the first arm 1 is about 135 °. Instead, it can be performed at all the deployment angle positions within the adjustable range of the deployment angle θ of the second arm 10.

  The angle adjuster 60A of the second embodiment further has the following advantages.

  Since the angle adjuster 60A includes the release means 40, the rotation of the second arm 10 in the reverse rotation direction G by the winding member 6A at an arbitrary deployment angle θ of the second arm 10 with respect to the first arm 1 is performed. Can be released by the release means 40.

  Further, the releasing means 40 has a second pressing pin 43 as the second pressing portion 41, and the second pressing pin 43 presses the winding member 6A in the loosening direction U, so that the reverse rotation direction G of the second arm 10 is achieved. Therefore, the prevention of the rotation of the second arm 10 in the reverse rotation direction G can be reliably canceled.

  Further, since the release means 40 includes the second toggle link mechanism 42, the operation of disposing the second pressing pin 43 at the second pressing position M2, that is, the prevention of the rotation of the second arm 10 in the reverse rotation direction G is canceled. The operation to perform can be performed with a small force, and the release operation can be easily performed.

  In the second toggle link mechanism 42, when the second output toggle link 44 (the link line L5) and the swing toggle link 25 (the link line L2) are substantially extended, the second pressing pin 43 is in the second pressing position. Since it is configured to be disposed at M2, the operation of disposing the second pressing pin 43 at the second pressing position M2, that is, the operation of releasing the blocking of the rotation of the second arm 10 in the reverse rotation direction G is ensured. It can be performed with a small force, and the release operation can be performed easily and reliably.

  Further, the toggle pin 26 includes one end portion (insertion hole 24a) of the first output toggle link 24, one end portion (insertion hole 25a) of the swing toggle link 25, and one end portion (insertion hole 44a) of the second output toggle link 44. Are pivotally attached to each other, the number of parts constituting the angle adjuster 60A can be further reduced. As a result, the angle adjuster 60A can be further reduced in size, and the manufacturing cost of the angle adjuster 60A can be further reduced.

  Further, since the second toggle link mechanism 42 includes the second guide link 45, the second pressing pin 43 can be reliably arranged at the second pressing position M2 and the second release position N2, respectively.

  Since the second pressing pin 43 is disposed in the second operation hole 6h provided in the winding member 6A, the second toggle link mechanism 42 can be further reduced in size, and the angle adjuster 60A Further downsizing can be achieved. Furthermore, when the second pressing pin 43 is disposed at the second pressing position M2, the second pressing pin 43 can loosen the winding member 6A and reliably press in the direction U. Thereby, prevention of the rotation of the second arm 10 in the reverse rotation direction G can be reliably released.

  The first end portion 6a (first insertion hole 6c) of the winding member 6A, the other end portion (insertion hole 27b) of the first guide link 27, and the other end portion (insertion hole 45b) of the second guide link 45 are mutually connected. Since it is pivotally attached to the first arm 1 via the common first pivot pin 31, the number of parts constituting the angle adjuster 60A can be further reduced. As a result, the angle adjuster 60A can be further reduced in size, and the manufacturing cost of the angle adjuster 60A can be further reduced.

  Since the second output toggle link 44, the swing toggle link 25, the first guide link 27, the second guide link 45, and the second pressing pin 43 are disposed between the winding members 6A and 6A, these When the links 44, 25, 27, and 45 are operated, it is difficult for rattling to occur. Therefore, the operation of the first toggle link mechanism 22 and the operation of the second toggle link mechanism 42 are performed smoothly.

<Third Embodiment>
13A to 14B are views for explaining an angle adjuster 60B according to a third embodiment of the present invention. In these drawings, the same reference numerals are given to components equivalent to those of the angle adjuster 60 of the first embodiment. Hereinafter, the configuration of the angle adjuster 60B of the first embodiment will be described focusing on the differences from the angle adjuster 60 of the first embodiment.

  In the angle adjuster 60B of the third embodiment, as shown in FIGS. 13A and 13B, each outer plate portion 3 of the first arm 1B has a guide length as a second insertion hole through which the second pivot pin 32B is inserted. A hole 3ba is formed. The guide long hole 3ba is formed to extend in the approaching direction with respect to the first end 6a (specifically, the first pivot pin 31) of the winding member 6 (see FIG. 14A). And the 2nd pivot pin 32B is the insertion long hole 3ba of each outer side board part 3, the 2nd insertion hole 6d of the 2nd end part 6b of each fastening member 6, and the insertion hole of the other end part of the rocking toggle link 25 25b, and the other end portion (insertion hole 25b) of the swing toggle link 25 and the second end portion 6b (second insertion hole 6d) of each tightening member 6 are common to each other. Are pivotally attached to both outer side plate portions 3 and 3 of the first arm 1B via the second pivoting pin 32B.

  “3i” in FIGS. 13A and 13B is a locking pin with which the other end (lower end) 35b of the first biasing spring 35 is locked. The locking pin 3i is formed of a rivet, and is inserted through the insertion hole 3h drilled in each outer plate 3 of the first arm 1B, and its tip is crushed into a large diameter. . As a result, as shown in FIG. 13B, the locking pin 3i is attached to the first arm 1B so as to protrude from the outer surface of the one outer side plate portion 3 in a fixed state.

  One end (upper end) 35a of the first biasing spring 35 is locked to the locking projection 30b of the operating rod 30, and the other end (lower end) 35b is locked to the locking pin 3i. Is always locked in a tension state. Accordingly, the operating rod 30 is constantly urged in the direction in which the first pressing pin 23 moves toward the first pressing position M1 by the urging force accumulated in the first urging spring 35.

  Next, with respect to the detailed configuration of the first toggle link mechanism 22B of the angle adjuster of the third embodiment and the operation of the angle adjuster 60B, FIGS. 14A and 14B are mainly shown with respect to the differences from the first embodiment. This will be described below with reference.

  In the angle adjuster 60B shown in FIG. 14A, the operating rod 30 is locked in a downward direction, which is a direction that prevents the second arm 10 from rotating in the normal rotation direction S from the neutral position (see FIG. 9A). The second pivot pin 32B strikes one end of the guide elongated hole 3ba disposed at a position far from the first end 6a (first pivot pin 31) of the winding member 6. Is arranged. In this case, the first toggle link mechanism 22B operates so that the first pressing pin 23 (its axial center Q1) is disposed at the first pressing position M1, as with the angle adjuster 60 of the first embodiment. To do. Accordingly, the first pressing pin 23 presses the winding member 6 in the winding direction V, so that the winding member 6 is elastically slightly deformed in the winding direction V so that the inner diameter of the winding portion 7 is reduced. The tightening force of the tightening member 6 on the outer peripheral surface 13a of the rotating shaft portion 13 increases. As a result, the second arm 10 is blocked not only in the reverse rotation direction G but also in the forward rotation direction S, that is, the second arm 10 is prevented from rotating in both the forward and reverse rotation directions S and G. Locked.

  Therefore, in the state of FIG. 14A, the urging force in the positive rotation direction S of the second urging spring 88 of the angle adjuster 70 of the reference embodiment is, for example, the load SK of the second arm 10 in the positive rotation direction S. Even when the second arm 10 is applied to the second arm 10 via 92 and the load SK in the positive rotation direction S is inadvertently applied to the second arm 10 (or the back frame 92), the second arm 10 is in the positive rotation direction. Do not rotate to S.

  “X” in FIG. 14A indicates that the rotation of the second arm 10 in the forward rotation direction S and the rotation in the reverse rotation direction G are blocked.

  In the angle adjuster 60B in the state shown in FIG. 14A, the user pushes the operating rod 30 with his / her hand in the upward direction, which is the direction in which the blocking of the rotation of the second arm 10 in the positive rotation direction S is released. 14B, the first output toggle link 24 (the link line L1) is centered on the first pressing pin 23 as in the first embodiment, as shown in FIG. 14B. Accordingly, the toggle pin 26 (its axial center W) moves to a position outside the first reference line C1.

  The first output toggle link 24 (the link line L1) and the swinging toggle link 25 (the link line L2) are moved to the position of the toggle pin 26 so that the angle between the two decreases with the movement of the toggle pin 26. The first guide link 27 (its link line L3) so that the first pressing pin 23 moves from the first pressing position M1 toward the first release position N1 along with the bending operation. ). And when the 1st press pin 23 is arrange | positioned in the 1st cancellation | release position N1, the 1st press pin 23 is a part in the internal peripheral surface as another part of the internal peripheral surface of the 1st operation hole 6g of the winding member 6. The portion 6gb (see FIG. 7) on the 1 release position N1 side is pressed, and the toggle pin 26 strikes the second end 6y of the long hole 6i of the winding member 6.

  Here, the other portion 6gb of the inner peripheral surface of the first operation hole 6g is inclined with respect to the movement direction A2 of the first pressing pin 23 to the first release position N1, and thus the movement direction A2 When the first pressing pin 23 that has moved to is disposed at the first release position N1, the first pressing pin 23 presses the winding member 6 in the loosening direction U in the same manner as in the first embodiment. Thereby, the winding member 6 is elastically slightly deformed in the loosening direction U so that the inner diameter of the winding portion 7 is increased, and the winding force of the winding member 6 on the outer peripheral surface 13a of the rotary shaft portion 13 is reduced. To do. As a result, the prevention of the rotation of the second arm 10 in the reverse rotation direction G by the winding member 6 is released, and the second arm 10 is allowed not only to rotate in the normal rotation direction S but also in the reverse rotation direction G. Is done.

  Further, by the above-described bending operation of the first output toggle link 24 (the link line L1) and the swing toggle link 25 (the link line L2), the other end of the swing toggle link 25 (the link line L2) is The second pivot pin 32B inserted through the insertion hole 25b is in the approach direction (the direction of the arrow A6) with respect to the first end 6a (first pivot pin 31) of the winding member 6 in the guide slot 3ba. ) To move slightly. Thereby, the winding member 6 is elastically slightly deformed so that the inner diameter of the winding portion 7 is increased and the winding force of the winding member 6 is decreased. As a result, the prevention of the rotation of the second arm 10 in the reverse rotation direction G is reliably released, and the second arm 10 is reliably allowed not only to rotate in the normal rotation direction S but also in the reverse rotation direction G. The

  Therefore, in the state shown in FIG. 14B, the urging force in the positive rotation direction S of the second urging spring 88 of the angle adjuster 70 of the reference embodiment is, for example, the load SK of the second arm 10 in the positive rotation direction S. By adding to the second arm 10 via 92, the second arm 10 easily rotates in the forward rotation direction S. Furthermore, when adjusting the deployment angle θ of the second arm 10 (back frame 92) relative to the first arm 1B (seat frame 91), a load GK in the reverse rotation direction G is applied to the second arm 10 to thereby adjust the second arm 10B. 10 easily rotates in the reverse rotation direction G. Therefore, the adjustment of the deployment angle θ of the second arm 10 (back frame 92) can be performed more easily.

  “◯” in FIG. 14B indicates that rotation of the second arm 10 in the forward rotation direction S and rotation in the reverse rotation direction G are permitted.

  According to the angle adjuster 60B of the third embodiment, as described above, the first output toggle link 24 (the link line L1) and the swing toggle link 25 (the link line L2) are bent. By operating the first toggle link mechanism 22B with the operating rod 30, the second pivot pin 32B is located in the guide slot 3ba with respect to the first end 6a (first pivot pin 31) of the winding member 6. To move in the approach direction (the direction of arrow A6). As a result, the winding member 6 is elastically deformed so that the inner diameter of the winding portion 7 increases and the winding force of the winding member 6 decreases. Therefore, the prevention of the rotation of the second arm 10 in the reverse rotation direction G can be reliably released.

  In the present invention, the technical idea applied to the third embodiment may be applied to the angle adjuster 30A of the second embodiment. That is, the guide elongated hole 3ba of the angle adjuster 30B of the third embodiment is provided in each outer plate portion 3 of the first arm 1 of the angle adjuster 60A of the second embodiment instead of the second insertion hole 3b. May be.

  Although several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, the angle adjuster according to the present invention may include a cover member that covers the angle adjuster from the upper side and / or from the lower side, for example.

  The angle adjuster according to the present invention may be configured by combining two or more of the technical ideas applied to the first to third embodiments.

  In addition, the angle adjuster according to the above embodiment is used as a deployment angle adjuster of the back frame of the seat chair, but the angle adjuster according to the present invention is limited to that used for the seat chair. In addition, for example, it may be used as an angle adjuster for an armrest in a chair with an armrest, or may be used as an angle adjuster for a footrest in a chair with a footrest, It may be used as a tilt angle adjuster for the top plate. Furthermore, it may be used for a folding bed, or may be used for a panel support device that supports a panel such as a liquid crystal display panel or an organic display panel so that the angle can be adjusted.

  INDUSTRIAL APPLICABILITY The present invention can be used for an angle adjuster used for furniture (eg, a reclining chair, a foldable bed, a foldable sofa), and a reclining chair (eg, a seat chair) provided with the angle adjuster. .

DESCRIPTION OF SYMBOLS 1, 1B: 1st arm 6, 6A: The 1st end part 6b: 2nd end part 6g of a fastening member 6a: 1st operation hole 6h: 2nd operation hole 6i: Long hole 6x : First end 6y of long hole: second end of long hole 7: tightening portion 10: second arm 13: rotating shaft portion 20: forward rotation preventing means 21: first pressing portion 22, 22B: first Toggle link mechanism 23: 1st pressing pin 24: 1st output toggle link 25: Oscillating toggle link 26: Toggle pin 27: 1st guide link 30: Control rod 31: 1st pivot pin 32, 32B: 2nd pivot link Pin 35: first biasing spring (first biasing member)
40: Release means 41: Second pressing portion 42: Second toggle link mechanism 43: Second pressing pin 44: Second output toggle link 45: Second guide links 60, 60A, 60B: Angle adjuster M1: First pressing Position N1: First release position M2: Second pressing position N2: Second release position 90: Seat chair (reclining chair)
91: seat frame 92: back frame

Claims (21)

A first arm having a winding member;
A second arm having a rotating shaft portion,
The rotating shaft portion is provided to be rotatable integrally with the second arm,
In the axial direction view of the rotating shaft portion, the first end portion and the second end portion of the winding member are spaced apart from each other and provided on the first arm,
The first arm and the second arm are configured such that the second arm is centered on the rotation shaft portion in a state where the winding tightening portion of the tightening member is wound on the outer peripheral surface of the rotation shaft portion. Connected to be rotatable relative to
The frictional force in the positive rotation direction generated at the contact portion between the outer peripheral surface of the rotary shaft portion and the inner peripheral surface of the winding fastening portion of the winding fastening member by the rotational movement of the second arm in the positive rotational direction is the winding force. By acting on the tightening member in the loosening direction with respect to the outer peripheral surface of the rotating shaft portion, the tightening force of the tightening member on the outer peripheral surface of the rotating shaft portion decreases, and the second arm moves in the positive rotation direction. Rotation is allowed and
The friction force in the reverse rotation direction generated in the contact portion by the rotation operation of the second arm in the reverse rotation direction acts on the winding member in the winding direction with respect to the outer peripheral surface of the rotary shaft portion, thereby causing the rotation. An angle adjuster configured to prevent a rotation of the second arm in a reverse rotation direction by increasing a tightening force of the tightening member on the outer peripheral surface of the shaft portion,
While having a 1st press part, the said 1st press part presses the said fastening member in the said fastening direction in the position of the arbitrary expansion angles of the said 2nd arm with respect to the said 1st arm, The said 2nd An angle adjuster characterized by comprising a forward rotation blocking means for blocking the rotation of the arm in the forward rotation direction. The forward rotation prevention means includes
The winding of the tightening member by the first pressing portion, the first pressing portion provided at the output end, the first pressing position where the first pressing portion pressed the winding member in the winding direction, and the first pressing portion. A first toggle link mechanism that moves between a first release position in which the pressing in the tightening direction is released;
The angle adjuster according to claim 1, further comprising: an operating rod that operates the first toggle link mechanism so that the first pressing portion moves between the first pressing position and the first release position. . The first toggle link mechanism includes a first output toggle link, a swing toggle link, a toggle pin, and the first pressing portion.
The toggle pin pivotally attaches one end of the first output toggle link and one end of the swing toggle link,
The other end of the swing toggle link is pivotally attached to the first arm,
The first pressing portion is provided at the other end of the first output toggle link as the output end of the first toggle link mechanism.
The first toggle link mechanism is configured such that the first pressing portion is disposed at the first pressing position when the first output toggle link and the swinging toggle link are substantially extended. Item 3. The angle adjuster according to Item 2. The first toggle link mechanism includes a first output toggle link, a swing toggle link, a toggle pin, a first pressing pin as the first pressing portion, and a first guide link.
The toggle pin pivotally attaches one end of the first output toggle link and one end of the swing toggle link,
The first pressing pin pivotally connects the other end of the first output toggle link as the output end of the first toggle link mechanism and the one end of the first guide link,
The other end of the swing toggle link is pivotally attached to the first arm,
The other end of the first guide link is pivotally attached to the first arm;
The first guide link guides the first pressing pin so that the first pressing pin moves between the first pressing position and the first release position.
The first toggle link mechanism is configured such that the first pressing pin is arranged at the first pressing position when the first output toggle link and the swinging toggle link are substantially extended. Item 3. The angle adjuster according to Item 2.   The said 1st end part of the said winding member and the said other end part of the said 1st guide link are pivoted by the said 1st arm through the mutually common 1st pivot pin. Angle adjuster.   The said 2nd end part of the said fastening member and the said other end part of the said rocking toggle link are pivoted by the said 1st arm through the mutually common 2nd pivoting pin. The angle adjuster in any one of. The second pivot pin is inserted in a guide slot provided in the first arm and extending in the approaching direction with respect to the first end of the winding member,
In the first toggle link mechanism, the second pivot pin is moved to the first end portion of the winding member in the guide long hole by the bending operation of the first output toggle link and the swing toggle link. The angle adjuster according to claim 6, wherein the angle adjuster is configured to be elastically deformed so that the tightening force of the tightening member is decreased by moving in the approaching direction. The first pressing portion is inserted into a first operation hole provided in the winding member and larger than a cross-sectional dimension of the first pressing portion,
The first toggle link mechanism is configured such that when the first pressing portion is disposed at the first pressing position, the first pressing portion presses a part of the inner peripheral surface of the first operation hole, whereby The angle adjuster in any one of Claims 3-7 comprised so that 1 press part may press the said fastening member in the said fastening direction.   The first toggle link mechanism is configured such that when the first pressing portion is disposed at the first release position, the first pressing portion presses another portion of the inner peripheral surface of the first operation hole. The angle adjuster according to claim 8, wherein the first pressing portion is configured to press the winding member in the loosening direction.   The other portion of the inner peripheral surface of the first operation hole is configured so that the pressing force in the loosening direction acts on the winding member when the first pressing portion presses the other portion. The angle adjuster according to claim 9, wherein the angle adjuster is inclined with respect to a moving direction of the first pressing pin to the first release position. The toggle pin is inserted through a long hole provided in the winding member,
The first end portion of the elongated hole is a movement stop portion of the toggle pin when the first output toggle link and the swing toggle link are substantially extended. Angle adjuster.   The first toggle link mechanism is configured such that the toggle pin presses the second end portion of the elongated hole in the loosening direction when the first pressing portion is disposed at the first release position. The angle adjuster according to Item 11.   The angle adjustment according to any one of claims 3 to 12, wherein the operating rod is provided integrally with the first output toggle link so that the first output toggle link operates integrally with the operation operation of the operating rod. vessel.   The angle adjustment according to any one of claims 3 to 13, wherein the operating rod is biased in a direction in which the first pressing portion moves toward the first pressing position by the biasing force of the first biasing member. vessel.   While having a 2nd press part, when the said 2nd press part presses the said fastening member in the said loosening direction in the position of the arbitrary deployment angles of the said 2nd arm with respect to the said 1st arm, the said fastening member The angle adjuster according to any one of claims 2 to 14, further comprising release means for releasing the blocking of the rotation of the second arm in the reverse rotation direction due to. The release means includes the second pressing portion provided at the output end, the second pressing portion where the second pressing portion presses the winding member in the loosening direction, and the tightening by the second pressing portion. A second toggle link mechanism for moving between the second release position where the pressing in the loosening direction of the member is released;
The angle adjustment according to claim 15, wherein the operating rod further operates the second toggle link mechanism so that the second pressing portion moves between the second pressing position and the second releasing position. vessel. The second toggle link mechanism includes a second output toggle link, the swing toggle link, the toggle pin, and the second pressing portion,
The toggle pin pivotally connects the one end of the first output toggle link, the one end of the swing toggle link, and one end of the second output toggle link;
The second pressing portion is provided at the other end of the second output toggle link as the output end of the second toggle link mechanism,
The second toggle link mechanism is configured such that the second pressing portion is disposed at the second pressing position when the second output toggle link and the swinging toggle link are substantially extended. Item 17. An angle adjuster according to Item 16. The second toggle link mechanism includes a second output toggle link, the swing toggle link, the toggle pin, a second pressing pin as the second pressing portion, and a second guide link.
The toggle pin pivotally connects the one end of the first output toggle link, the one end of the swing toggle link, and one end of the second output toggle link;
The second pressing pin pivotally connects the other end of the second output toggle link as the output end of the second toggle link mechanism and the one end of the second guide link,
The other end of the second guide link is pivotally attached to the first arm;
The second guide link guides the second pressing pin so that the second pressing pin moves between the second pressing position and the second release position.
The second toggle link mechanism is configured such that the second pressing pin is disposed at the second pressing position when the second output toggle link and the swinging toggle link are substantially extended. Item 17. An angle adjuster according to Item 16. The second pressing portion is provided in the second fastening hole provided in the winding member and larger than a cross-sectional dimension of the second pressing portion,
The second toggle link mechanism is configured such that when the second pressing portion is disposed at the second pressing position, the second pressing portion presses a part of the inner peripheral surface of the second operation hole, thereby The angle adjuster according to claim 17 or 18, wherein two pressing portions are configured to press the winding member in the loosening direction.   The angle adjuster according to claim 1, wherein the second arm is biased in the forward rotation direction. The left and right side frame portions of the seat frame and the left and right side frame portions of the back frame are connected to each other via left and right angle adjusters,
Each of the left and right angle adjusters includes a first arm to which a corresponding side frame portion of the seat frame is attached, and a second arm to which a corresponding side frame portion of the back frame is attached, and A reclining chair in which the first arm and the second arm are coupled so that the second arm is rotatable relative to the first arm,
A reclining chair, wherein at least one of the left and right angle adjusters is the angle adjuster according to any one of claims 1 to 20.

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