JP6942592B2 - Chair - Google Patents

Description

The present invention relates to a chair.

In recent years, diversification of work attitudes has been proposed for the purpose of improving health and improving work efficiency in office work. Examples of the working posture include a basic posture in which the seated person sits deeply on the chair, and a semi-standing posture in which the seated person sits shallowly on the chair with the knees slightly bent at a position higher than the basic posture. ..

Some conventional chairs are equipped with a gas spring as a mechanism for adjusting the height of the seating surface. However, it is difficult to secure the stroke from the seating surface in the basic posture to the seating surface in the semi-standing posture with only the gas spring.

Here, Patent Document 1 below discloses a chair in which the height of the seating surface can be switched by configuring the seat to be rotatable. Specifically, in Patent Document 1 below, a seat assembly (seat) is supported on the pedestal (support structure) so as to be rotatable around a pivot rod. The seat assembly includes a seat surface and a flange extending downward from the front edge of the seat surface.

According to this configuration, the seat surface can be the first seating surface when the seat surface faces upward. In this case, it is considered that the seated person can support the portion from the buttocks to the thighs of the seated person by the seating surface by sitting deeply (the above-mentioned basic posture).
On the other hand, when the seat assembly is rotated upward around the pivot rod, the flange faces upward, and the flange portion rises by the length in the depth direction of the seat surface from the seat surface height in the basic posture. As a result, the flange can be used as the second seating surface, and it is considered that the buttocks of the seated person can be supported by the flange while the seated person sits shallowly (the above-mentioned semi-standing posture).

U.S. Patent Application Publication No. 2015/0282623

By the way, the depth length of the seat is often set so that the front end of the seat is close to the nodule between the knee and the shin with the buttocks placed on the rear end of the seat. Therefore, in the configuration of Patent Document 1, the height of the second seating surface (flange) is limited by the depth length of the seat. That is, the amount of ascent from the first seating surface to the second seating surface cannot be made lower than the depth length of the seat. In this case, depending on the size of the seated person's body, the buttocks may be supported with the knees fully extended or the legs floating.

As described above, the fixed provision of the portion to be the second seating surface (flange) separately from the portion to be the first seating surface (seat surface) is largely restricted in terms of design and design. Therefore, in the conventional configuration, there is room for improvement in improving the degree of freedom in design and design, and obtaining an appropriate sitting posture in both the basic posture and the semi-standing posture.

The present invention has been made in view of the above circumstances, and provides a chair capable of improving the degree of freedom in design and design and obtaining an appropriate sitting posture in both a basic posture and a semi-standing posture. The purpose is.

In order to achieve the above object, the chair according to one aspect of the present invention includes a support structure, a rear side seat body rotatably supported by the support structure around the first axis along the width direction, and a rear seat body. a seat having arranged in front, rotatably configured front seat body about a second axis along the width direction with respect to the rear seat body with respect to the rear seat body, below the seat The seat is provided with a regulating member for restricting movement, and the seat has a first seating position in which the seating surface of the rear side seat body and the seating surface of the front side seating body are connected to form a first seating surface, and the rear side. The seat body is arranged so as to extend upward from the first axis, the front side seat body is located above the rear side seat body, and the seat surface of the front side seat body constitutes the second seating surface. The restricting member restricts the downward movement of the front seat body at the second seating position.
According to this configuration, in the first seating position, the seating surfaces of the first and second seating bodies are integrated to form the first seating surface, so that the portion from the buttocks to the thighs of the seated person is formed. Can be stably supported.
On the other hand, in the second seating position, the seating height of the second seating body is determined by the depth length of the first seating body. The seat height at the seating position can be lowered. As a result, in the second seating position, the buttocks of the seated person can be stably supported with the knees slightly bent. Therefore, an appropriate sitting posture can be obtained at both the first seating position and the second seating position.
Further, since the seat height at the second seating position can be adjusted by the depth length of the first seat, the degree of freedom in design and design can be improved.
Moreover, in this embodiment, since the downward movement of the second seat body is regulated by the regulating member in the second seating position, robustness can be ensured and the buttocks of the seated person can be supported more stably in the second seating position. ..

In the chair according to one aspect of the present invention
The first end portion of the regulating member is rotatably supported by one of the supporting structure and the front seating body around the third axis along the width direction, and the regulating member is regulated. The second end portion of the member may be configured to be connectable to any one of the support structure and the front seat body at the second seating position.
According to this configuration, the regulating member is bridged between the second seat body and the support structure at the second seating position, so that the robustness can be further improved.

In the chair according to one aspect of the present invention, the second end portion of the regulating member may be rotatably supported around the fourth axis along the width direction with respect to the other member.
According to this configuration, since the regulating member constitutes the link mechanism together with the first seat body, it is possible to easily and surely switch the seat surface height while ensuring robustness.

In the chair according to one aspect of the present invention, at the first seating position, the length of the front seat body in the depth direction may be shorter than the length of the rear seat body in the depth direction.
According to this configuration, especially in the second seating position, the moment around the first axis acting on the second seating body due to the load of the seated person can be reduced, so that the robustness can be further improved. Can be done.

In the chair according to one embodiment of the present invention, the bearing surface of the front SL front-seat member may comprise an inclined portion inclined downward toward the front.
According to this configuration, in the first seating position, the portion of the thigh near the knee is supported by the inclined portion. As a result, it is possible to suppress the compression of the portion of the thigh near the knee as compared with the case where the seat surface of the second seat is formed on a flat surface.
On the other hand, in the second seating position, the portion of the thigh near the buttocks is supported by the inclined portion. As a result, it is possible to suppress the pressure on the portion of the thigh near the buttocks as compared with the case where the seating surface of the second seat is formed on a flat surface. In this way, in both the first seating position and the second seating position, the tilted portion suppresses the pressure on the thigh of the seated person.

The chair according to one aspect of the present invention is provided with a backrest supported by the support structure, and the backrest is separated rearward from a load support surface that supports the load of the occupant. It may be provided with a grip portion to be provided.
According to this configuration, the chair can be easily carried to a desired place by gripping the grip portion and moving the chair. As a result, it is possible to perform work or the like in a desired sitting posture regardless of the location (for example, even in a location other than one's own seat).

According to one aspect of the present invention, it is possible to obtain an appropriate sitting posture in both the basic posture and the semi-standing posture while improving the degree of freedom in design and design.

It is a perspective view which looked at the chair which concerns on embodiment from the left front direction. It is a perspective view which looked at the chair which concerns on embodiment from below. It is a side view which looked at the chair which concerns on embodiment from the left side. It is sectional drawing corresponding to the IV-IV line of FIG. It is a side view of the chair corresponding to FIG. 3 which shows the state which the seat is in a semi-standing position. It is explanatory drawing of the reclining operation, and is the side view of the chair corresponding to FIG. It is explanatory drawing for demonstrating the method of switching the seat surface height, and is the side view of the chair corresponding to FIG. It is a side view which looked at the chair which concerns on 2nd Embodiment from the left side. It is explanatory drawing of the reclining operation, and is the side view of the chair corresponding to FIG. It is a side view of the chair corresponding to FIG. 8 which shows the state which the seat is in a semi-standing position. It is a perspective view which looked at the chair which concerns on 3rd Embodiment from the left front. It is a side view of the chair which concerns on 3rd Embodiment. It is a side view of the chair corresponding to FIG. 12 which shows the state which the seat is in a semi-standing position. It is a top view of the chair which concerns on 3rd Embodiment. It is a perspective view which looked at the chair which concerns on 4th Embodiment from the left front. It is a side view of the chair which concerns on 4th Embodiment. It is an enlarged cross-sectional view of the seat which concerns on the modification of 4th Embodiment. It is an enlarged cross-sectional view of the seat which concerns on the modification of 4th Embodiment. It is a perspective view which looked at the chair which concerns on 5th Embodiment from the left front. It is a side view of the chair which concerns on 5th Embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the orientations such as front-back, up-down, left-right, etc. are the same as the orientations of the person (seat person) seated in the chair 1 in the normal posture. In this case, the front-rear direction corresponds to the depth direction of the present invention, and the left-right direction corresponds to the width direction of the present invention. Further, in the figure, the arrow UP indicates the upper side, the arrow FR indicates the front side, and the LH indicates the left side.

(First Embodiment)
[Chair]
FIG. 1 is a perspective view of the chair 1 as viewed from the front left.
As shown in FIG. 1, the chair 1 includes a leg 2, a support base 3, a seat 4, a backrest 5, and an accoudoir 6.

The leg 2 includes a multi-leg 7 and a pedestal 8 erected from the center of the multi-leg 7.
Casters 9 capable of traveling on the floor are attached to each leg of the multi-leg 7.
The pedestal 8 has a built-in gas spring (not shown) which is an elevating mechanism for elevating and lowering the rod 10. That is, when the rod 10 is raised and lowered by the gas spring, the seat 4, the backrest 5, and the armrest 6 are raised and lowered integrally.

The support base 3 is connected to the upper end portion of the pedestal 8 (rod 10).
The seat 4 is supported from below by the support base 3. The seat 4 supports the buttocks and the like of the seated person from below.
The backrest 5 is tiltably connected to the support base 3 behind the seat 4. The backrest 5 supports the waist and back of the seated person from behind.
The armrests 6 are fixed to the backrests 5 on both the left and right sides of the seat 4. The armrest 6 supports the seated person's arm or the like from below.

<Support>
FIG. 2 is a perspective view of the chair 1 as viewed from below.
As shown in FIG. 2, the support base 3 mainly includes a support basic body 21 and a link arm 23. The support base 3 is also equipped with an operation unit (not shown) for operating the elevating mechanism described above.

The support basic body 21 functions as a strength member in supporting the load of the seated person. The support basic body 21 includes a base portion 25 and a base arm 26.
The base portion 25 is fixed to the upper end portion of the rod 10.
The base arm 26 extends rearward from both ends in the left-right direction of the base portion 25.

<Back lean>
FIG. 3 is a side view of the chair 1 as viewed from the left side.
As shown in FIGS. 1 and 3, the above-mentioned backrest 5 includes a backrest frame 31, a tension member 32 provided on the backrest frame 31, and an extension portion 33 extended from the backrest frame 31. , A torsion unit 34 for connecting the extension portion 33 and the support base 3 is mainly provided.
The backrest frame 31 is formed in a rectangular frame shape when viewed from the front. The backrest frame 31 functions as a strength member in supporting the load of the seated person. Specifically, the backrest frame 31 has a pair of side frames 31a that are located on both the left and right sides and extend in the vertical direction, and a connecting frame 31b that connects the upper ends of the side frames 31a.

The connecting frame 31b has a connecting portion 31c extending rearward from the upper end portion of each side frame 31a, and a horizontal portion 31d connecting the rear end portions of the connecting portions 31c to each other.
The horizontal portion 31d has a curved shape that is convex toward the rear in a plan view seen from the vertical direction.

The upholstery member 32 covers the opening of the backrest frame 31 from the front by being erected between the above-mentioned side frames 31a. The front surface of the upholstery member 32 functions as a load supporting surface that supports the load from the back when the seated person is seated.
The connecting frame 31b described above projects upward from the upholstery member 32. The horizontal portion 31d of the connecting frame 31b is separated rearward from the upholstery member 32. The horizontal portion 31d functions as a grip portion that can be gripped with a hand or the like inserted into the space defined by the upper end edge of the upholstery member 32 and the connecting frame 31b. That is, the seated person can easily carry the chair 1 to a desired place by grasping the horizontal portion 31d and moving the chair 1. As a result, it is possible to perform work or the like in a desired sitting posture regardless of the location (for example, even in a location other than one's own seat).

As shown in FIG. 3, the extension portion 33 is connected to the lower frame portion of the backrest frame 31. Specifically, the extension portion 33 extends forward toward the bottom. The extension portion 33 is provided with a backrest bracket 35. The backrest bracket 35 may be provided integrally with the extension portion 33. In the present embodiment, the support structure is composed of the backrest bracket 35 and the support basic body 21 described above.

The backrest bracket 35 is formed with a seat support portion 36 and a damper support portion 37 that project upward from the extension portion 33. In the present embodiment, the seat support portion 36 is located above and behind the damper support portion 37. However, the relative positions of the seat support portion 36 and the damper support portion 37 can be changed as appropriate.

As shown in FIG. 2, the torsion unit 34 is housed in a portion of the support basic body 21 located between the base arms 26. The torsion unit 34 is interposed between the support basic body 21 and the extension portion 33 to elastically support the tilt of the backrest 5.

FIG. 4 is a cross-sectional view corresponding to line IV-IV of FIG.
As shown in FIG. 4, the torsion unit 34 mainly includes a pivot 41, a rubber torsion 42 (elastic member), and a housing 43.

The pivot 41 is formed in a prismatic shape extending in the left-right direction. Both ends of the pivot 41 in the left-right direction are non-rotatably supported by the base arm 26.
The rubber torsion 42 is formed in a cylindrical shape that surrounds the circumference of the pivot 41. The inner peripheral surface of the rubber torsion 42 is fixed to the outer peripheral surface of the pivot 41.
The housing 43 is formed in a cylindrical shape that surrounds the rubber torsion 42. The inner peripheral surface of the housing 43 is fixed to the outer peripheral surface of the rubber torsion 42. An extension 33 (see FIG. 2) is connected to the rear end of the housing 43. A rotation restricting member (not shown) that defines the rotation range of the housing 43 is provided between the housing 43 and the support basic body 21. The reclining mechanism of the backrest 5 is not limited to the torsion unit 34.

As shown in FIG. 2, the link arms 23 are arranged in pairs with respect to the support basic body 21 (base arm 26) described above on the outside in the left-right direction (direction away from the center in the left-right direction). The rear end of each link arm 23 is connected to the corresponding base arm 26 via an arm rotation shaft 51. The arm rotation shafts 51 extend in the left-right direction, respectively. That is, the rear end portion of the link arm 23 is rotatably supported by the base arm 26 around the axis line Oa (see FIG. 3) along the left-right direction. In the illustrated example, the pair of link arms 23 are connected to each other by a bridge portion 52 at the central portion in the front-rear direction.

As shown in FIG. 3, a guide portion 55 is formed at the front end portion of each link arm 23. The guide portion 55 is formed in an elongated hole that penetrates each link arm 23 in the left-right direction and extends in the extending direction (front-back direction in the illustrated example) of the link arm 23.

<Za>
The seat 4 is divided into a rear seat body 61 located at the rear and a front seat body 62 located at the front of the rear seat body 61.
The rear seat body 61 includes a rear main body portion 63, a backrest connecting portion 64, and a rear seat body connecting portion 65.
The rear main body 63 is configured by attaching a cushioning material or a tensioning material to a substrate forming a skeleton.

The backrest connecting portion 64 projects downward at the rear portion of the rear main body portion 63. The backrest connecting portion 64 is connected to the seat support portion 36 of the backrest bracket 35 described above via a rear rotation shaft 66 extending in the left-right direction. That is, the rear seat body 61 is supported by the backrest bracket 35 so as to be rotatable around the axis Ob along the left-right direction.

The rear seat body connecting portion 65 is provided on the lower surface of the rear main body portion 63 in a state of protruding forward from the front end edge of the rear main body portion 63. In the illustrated example, a plurality (for example, three) of the rear seat body connecting portions 65 are provided at intervals in the left-right direction. The design of the positions and numbers of the rear seat connecting portions 65 can be changed as appropriate.

The front seat body 62 mainly includes a front main body portion 71, a front seat body connecting portion 72, and an arm connecting portion 73.
Like the rear main body 63, the front main body 71 is configured by attaching a cushioning material or a tensioning material to a substrate forming a skeleton. In the present embodiment, the length of the front main body 71 in the front-rear direction is shorter than the length of the rear main body 63 in the front-rear direction. However, the length of the front main body 71 may be shorter than that of the rear main body 63 or equal to that of the rear main body 63. The front portion of the front main body portion 71 of the present embodiment forms an inclined portion 71a that inclines downward toward the front end edge of the front main body portion 71. The inclined portion 71a may be formed at least in the front portion of the front main body portion 71, and the entire front main body portion 71 may be formed as the inclined portion 71a.

The front seat body connecting portion 72 is provided on the lower surface of the front main body portion 71 in a state of protruding rearward from the rear end edge of the front main body portion 71. A plurality (for example, three) of front side seat connecting portions 72 are provided at intervals in the left-right direction corresponding to the rear side seat connecting portion 65. Each front seat connecting portion 72 is supported by a rear seat connecting portion 65 corresponding to each other in the left-right direction via a seat connecting pin 75. Each seat connecting pin 75 extends in the left-right direction in front of the rear rotation shaft 66 described above. That is, the front seat body 62 is rotatably connected to the rear side seat body 61 around the axis Oct along the left-right direction.

In the present embodiment, the configuration in which the rear seat body 61 and the front seat body 62 are divided has been described, but the present invention is not limited to this configuration, and the rear seat body 61 and the front seat body 62 are rotatably supported. It doesn't matter if it is done. In this case, for example, the seat 4 may be bendable between the rear seat body 61 and the front seat body 62.

The arm connecting portion 73 projects downward from a portion located in front of the front seat connecting portion 72 on the lower surface of the front main body portion 71. A pair of arm connecting portions 73 are provided at intervals in the left-right direction corresponding to the link arm 23 described above. Each arm connecting portion 73 is connected to the front end portion of the corresponding link arm 23 via a front rotating shaft 76 extending in the left-right direction. Specifically, the front rotation shaft 76 is connected to the arm connecting portion 73 through the guide portion 55 of the link arm 23. In this case, the front seat body 62 is rotatably supported by the link arm 23 around the axis Od along the left-right direction. The front rotation shaft 76 is configured to be movable with respect to the link arm 23 along the extending direction (front-rear direction) of the link arm 23 of the front seat body 62.

As described above, the chair 1 of the present embodiment includes the rear seat body 61 and the backrest bracket 35, the rear seat body 61 and the front seat body 62, the link arm 23 and the support basic body 21, and the link arm 23. And between the front seat bodies 62 are rotatably connected around the axes Oa to Od along the left-right direction, respectively. That is, in the chair 1 of the present embodiment, the backrest bracket 35 is a fixed link, the rear seat body 61, the front seat body 62, and the link arm 23 are movable links, and the links are rotatably connected to each other. It also constitutes a so-called four-section link mechanism.

FIG. 5 is a side view of the chair 1 showing a state in which the seat 4 is in a semi-standing position.
As shown in FIGS. 3 and 5, the seat 4 of the present embodiment can be switched between a basic position (see FIG. 3) and a semi-standing position (see FIG. 5) in which the seating position is higher than the basic position. It is configured. Specifically, at the basic position shown in FIG. 3, the rear seat body 61 and the front seat body 62 are arranged in the front-rear direction at the same height, and the seat surfaces (upper surface) of the rear side seat body 61 and the front side seat body 62 are aligned. They are arranged flush with each other. That is, both the seating surfaces of the rear seat body 61 and the front seat body 62 function as seating surfaces at the basic positions. In the basic position, the portion from the buttocks to the thighs of the seated person is supported by the seating surfaces of the posterior seated body 61 and the front side seated body 62 while the seated person sits deeply on the seat 4. At this time, the portion of the thigh near the knee is supported by the anterior seat body 62 (anterior main body portion 71) by the inclined portion 71a. As a result, it is possible to suppress the compression of the portion of the thigh near the knee as compared with the case where the seat surface of the front seat body 62 is formed on a flat surface.

On the other hand, in the semi-standing position shown in FIG. 5, the rear seat body 61 and the link arm 23 extend diagonally upward from the axes Oa and Ob, respectively, and the seat surface of the front seat body 62 faces upward. It is held above the side seat 61 and the link arm 23. That is, the seating surface of the front seating body 62 functions as a seating surface in the semi-standing position. In the semi-standing position, with the knees slightly bent, the buttocks and the portion of the thighs closer to the buttocks are supported by the seating surface of the anterior seat body 62. At this time, the portion of the thigh near the buttocks is supported by the inclined portion 71a on the front side seat body 62 (front side main body portion 71). As a result, it is possible to suppress the compression of the portion of the thigh near the buttocks as compared with the case where the seat surface of the front seat body 62 is formed on a flat surface. In this way, it is possible to prevent the seated person's thigh from being pressed by the inclined portion 71a in both the basic position and the semi-standing position. The seating surface of the front seat body 62 in the semi-standing position may be tilted (for example, forward tilted) with respect to the horizontal direction.

In the present embodiment, the seat height at the basic position of the elevating mechanism (gas spring) at the uppermost position is lower than the seat height at the semi-standing position at the lowermost position of the elevating mechanism. However, the seat height at the basic position at the uppermost position of the elevating mechanism (gas spring) may be set to be equal to or higher than the seat height at the semi-standing position at the lowermost position of the elevating mechanism. In the semi-standing position, the seat height of the front seat body 62 can be adjusted by operating the elevating mechanism (gas spring) by an operation mechanism (not shown). This point is the same in each of the following embodiments.

As shown in FIGS. 2 and 3, of the above-mentioned rear side seat connecting portions 65 and each front seat connecting portion 72, the rear seat connecting portion 65a and the front seat body located at the central portion in the left-right direction. A gas damper 80 is connected between the seat connecting pin 75a that connects the connecting portions 72a to each other and the damper support portion 37. The gas damper 80 is configured so that the rod 82 can move forward and backward with respect to the cylinder 81.

As shown in FIG. 3, the gas damper 80 is rotatably connected to the damper support portion 37 via a damper connecting pin 85 whose rear end portion of the cylinder 81 extends in the left-right direction. On the other hand, in the gas damper 80, the front end portion of the rod 82 is rotatably connected to the seat connecting pin 75a. That is, the gas damper 80 rotates around the damper connecting pin 85 and the seat connecting pin 75 according to the switching operation between the basic position and the semi-standing position of the seat 4, and the rod 82 advances and retreats with respect to the cylinder 81. .. The configuration may not have the gas damper 80.

Of the link arm 23 and each base arm 26, a regulation mechanism 90 for holding the seat 4 in either the basic position or the semi-standing position is provided between the link arm 23 and the base arm 26 facing each other in the left-right direction. ing. The regulation mechanism 90 engages the through hole 91 formed in the link arm 23, the first engaging recess 92 and the second engaging recess 93 formed in the base arm 26, and the link arm 23 and the base arm 26. It includes an engaging pin 95.

The through hole 91 penetrates the link arm 23 in the left-right direction.
The engaging recesses 92 and 93 are opened outward in the left-right direction in the base arm 26. The engaging recesses 92 and 93 are formed at intervals on the movement locus of the through hole 91 accompanying the rotation of the link arm 23. Specifically, the first engaging recess 92 is formed at a position where it overlaps with the through hole 91 at the basic position when viewed from the left and right directions. As shown in FIG. 5, the second engaging recess 93 is formed at a position where it overlaps with the through hole 91 in a semi-standing position when viewed from the left and right.

The engaging pin 95 is configured to be able to enter either the first engaging recess 92 or the second engaging recess 93 through the through hole 91. Specifically, the engaging pin 95 is configured to be able to enter the first engaging recess 92 through the through hole 91 at the basic position. As a result, the rotational operation of the link arm 23 with respect to the base arm 26 is restricted.
The engaging pin 95 is configured to be able to enter the second engaging recess 93 through the through hole 91 in the semi-standing position. As a result, the rotational operation of the link arm 23 with respect to the base arm 26 is restricted. The engaging pin 95 may be slidably supported by, for example, the link arm 23, or may be provided separately from the link arm 23 and the base arm 26.

[Action]
<Reclining operation>
Next, as the action of the chair 1 described above, the reclining operation will be described first. FIG. 6 is an explanatory view of the reclining operation, and is a side view corresponding to FIG. In the following description, the reclining operation at the basic position of the seat 4 will be described. In the following description, the state shown in FIG. 3 (the state in which the backrest 5 is most raised) is set as the initial position.
As shown in FIGS. 3 and 6, when the seated person leans against the backrest 5, the backrest 5 rotates backward around the pivot 41 together with the housing 43 of the torsion unit 34 according to the load acting on the backrest 5. do. When the housing 43 rotates with respect to the pivot 41, the rubber torsion 42 twists. As a result, the backrest 5 tilts backward (backward tilt position) in a state where the restoring force of the rubber torsion 42 is applied via the housing 43.
On the other hand, when the seated person separates from the backrest 5, the backrest 5 rotates forward together with the housing 43 around the pivot 41 by the restoring force of the rubber torsion 42. As a result, the backrest 5 rises from the backward tilted position to the initial position.

Here, of the seats 4, the rear seat body 61 is connected to the backrest bracket 35 via the rear rotation shaft 66. Therefore, for example, when the backrest 5 tilts backward from the initial position, the seat 4 is pulled backward along with the rearward displacement of the backrest 5. At this time, the front rotation shaft 76 moves rearward (in the direction approaching the pivot 41) in the guide portion 55, so that the seat 4 moves rearward so as to follow the tilt of the backrest 5. The front rotation shaft 76 does not come into contact with the first end edge (rear end edge in FIG. 3) of the inner peripheral edge of the guide portion 55 even when the backrest 5 moves to the rearmost tilted position. It is set.

On the other hand, when the backrest 5 returns from the backward tilted position to the initial position, the seat 4 is pushed forward following the forward tilt of the backrest 5 around the pivot 41. At this time, the front rotation shaft 76 moves forward in the guide portion 55 (in the direction away from the pivot 41), so that the seat 4 moves forward so as to follow the tilt of the backrest 5. The front rotation shaft 76 approaches the second end edge (front end edge in FIG. 3) of the guide portion 55 when the backrest 5 moves to the most forward tilted position.

In the present embodiment, the case where the guide portion 55 formed on the link arm 23 is formed into a long hole has been described, but the present invention is not limited to this configuration. Rails or the like may be used as long as the seat 4 follows the reclining of the backrest 5. Further, the link arm 23 may be provided with a front rotation shaft, and the arm connecting portion 73 may be provided with a guide portion.

<How to switch the seat height>
Next, a method of switching the seat height will be described. In the following description, a method of switching from the basic position to the semi-standing position will be mainly described.
First, as shown in FIG. 3, the engaging pin 95 is pulled out from the first engaging recess 92 to release the engagement between the base arm 26 and the link arm 23. Then, for example, while holding the rear seat body 61, the seat 4 is lifted upward.

FIG. 7 is an explanatory view for explaining a method of switching the seat height, and is a side view corresponding to FIG.
As shown in FIG. 7, when the seat 4 is lifted upward, the rear seat body 61 rotates upward around the axis Ob, and the link arm 23 rotates upward around the axis Oa. Along with this, the front seat body 62 moves backward while moving upward. At this time, the front side seat body 62 rotates downward around the axis Oct with respect to the rear side seat body 61, so that the front side rotation shaft 76 slides in the guide portion 55 and becomes the link arm 23. On the other hand, it rotates downward around the axis Od (direction approaching the pivot 41). After that, the engaging pin 95 is made to enter the second engaging recess 93 through the through hole 91. As a result, as shown in FIG. 5, the seat 4 is held in the semi-standing position. When shifting from the basic position to the semi-standing position, the rod 82 of the gas damper 80 extends with respect to the cylinder 81 as the seat connecting pin 75 moves upward.

In the semi-standing position, the downward rotation of the front seat body 62 is regulated by the front rotation shaft 76 coming into contact with the first end edge (lower end edge in FIG. 5) of the guide portion 55 from above. That is, in the semi-standing posture, the front seat 62 is supported from below by the rear seat 61, the link arm 23, and the gas damper 80. As a result, the front seat body 62 is held above the link arm 23 and the rear seat body 61 with the seat surface facing upward. When switching the seat 4 from the semi-standing position to the basic position, the operation opposite to the above-described operation is performed.

As described above, in the present embodiment, the seat 4 is divided into the rear side seat body 61 and the front side seat body 62, and the basic position and the semi-standing position are formed by the rotational operation of the rear side seat body 61 and the front side seat body 62. The position is switched.
According to this configuration, in the basic position, the seating surfaces of the rear seat body 61 and the front seat body 62 are integrated to form a seating surface, so that the portion from the buttocks to the thighs of the seated person is stable. Can be supported.
On the other hand, since the seating height in the semi-standing position is determined by the front-rear length of the rear seat body 61, the seat in the semi-standing position is compared with the case where the entire seat is rotated as in the conventional case. The surface height can be lowered. As a result, in the semi-standing position, the buttocks of the seated person can be stably supported with the knees slightly bent. Therefore, an appropriate sitting posture can be obtained in both the basic posture and the semi-standing posture.
Further, since the seat height in the semi-standing position can be adjusted by the front-rear length of the rear seat body 61, the degree of freedom in design and design can be improved.
Moreover, in the present embodiment, since the downward movement of the front seat body 62 is restricted by the link arm 23 in the semi-standing position, robustness can be ensured and the buttocks of the seated person can be made more stable in the semi-standing position. I can support it.

In the present embodiment, the link arm 23 is rotatably supported by both the front seat body 62 and the support basic body 21.
According to this configuration, since the link arm 23 constitutes the link mechanism together with the rear seat body 61, it is possible to easily and surely switch the seat surface height while ensuring robustness.

In the present embodiment, the front-rear length of the front seat 62 is shorter than the front-rear length of the rear seat 61.
According to this configuration, especially in the semi-standing position, the moment around the axis Oct acting on the front seat body 62 due to the load of the seated person can be reduced, so that the robustness can be further improved. can.

In the above-described embodiment, the configuration in which the seat 4 follows the reclining of the backrest 5 has been described, but the configuration is not limited to this configuration. That is, the backrest 5 may be configured to recline independently. In this case, the axis lines Oa and Ob are set in the support basic body 21. Further, the configuration may not have the backrest 5 and the armrest 6.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described. FIG. 8 is a side view of the chair 100 according to the second embodiment. In the following description, the members corresponding to the above-described first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
In the chair 100 shown in FIG. 8, a housing bracket 101 is formed in the housing 43 of the torsion unit 34. The housing bracket 101 projects upward from the housing 43.

The above-mentioned backrest connecting portion 64 of the rear seat body 61 is rotatably connected to the upper end portion of the housing bracket 101 around the axis Ob. That is, the seat 4 (rear seat body 61) is connected to the backrest 5 via the torsion unit 34. Therefore, the seat 4 moves in the front-rear direction around the pivot 41 following the tilt of the backrest 5.

The front seat body 62 includes an arm connecting portion 113 that projects downward from the lower surface of the front main body portion 71. The arm connecting portion 113 is formed with a first guide portion 121 and a second guide portion 122. The guide portions 121 and 122 are formed in elongated holes extending in the front-rear direction. The first guide portion 121 is arranged above and behind the second guide portion 122.

A first link arm 110 and a second link arm 111 are bridged between the housing bracket 101 and the arm connecting portion 113. In the example shown in FIG. 8, the link arms 110 and 111 extend along the front-rear direction.

The rear end portion of the first link arm 110 is connected to the housing bracket 101 via a first rear link shaft 130 extending in the left-right direction. In this case, the rear end portion of the first link arm 110 is rotatably supported by the housing bracket 101 around the axis Op along the left-right direction.
The front end portion of the first link arm 110 is connected to the arm connecting portion 113 via the first front link shaft 131 extending in the left-right direction. Specifically, the first front link shaft 131 is supported by the arm connecting portion 113 through the first guide portion 121. In this case, the front end of the first link arm 110 is configured to be rotatable around the axis Oq along the left-right direction, and the first link arm 110 is connected to the arm as the first front link shaft 131 moves in the first guide portion 121. It is configured to be slidable in the front-rear direction with respect to the portion 113.

The rear end portion of the second link arm 111 is connected to the housing bracket 101 via a second rear link shaft 140 extending in the left-right direction. In this case, the rear end portion of the second link arm 111 is rotatably supported by the housing bracket 101 around the axis Or along the left-right direction.
The front end portion of the second link arm 111 is connected to the arm connecting portion 113 via the second front link shaft 141 extending in the left-right direction. Specifically, the second front link shaft 141 is supported by the arm connecting portion 73 through the second guide portion 122. In this case, the front end portion of the second link arm 111 is configured to be rotatable around the axis Os along the left-right direction, and the second link arm 111 is connected to the arm as the second front link shaft 141 moves in the second guide portion 122. It is configured to be slidable in the front-rear direction with respect to the portion 73.

In this embodiment, the first link arm 110, the second link arm 111, the housing bracket 101, and the arm connecting portion 113 are each provided in pairs on the left and right.

As described above, in the chair 100 of the present embodiment, the housing bracket 101, the arm connecting portion 113, and the link arms 110 and 111 are rotatably connected as movable links around the axes Op to Os, that is, a so-called four-bar link. It constitutes a mechanism.

FIG. 9 is an explanatory view of the reclining operation, and is a side view corresponding to FIG.
As shown in FIG. 9, in the chair 100 of the present embodiment, since the rear seat body 61 is connected to the housing bracket 101, for example, when the backrest 5 tilts backward from the initial position, it is rearward of the backrest 5. The seat 4 is pulled backward with the displacement to. As a result, the seat 4 moves backward so as to follow the tilt of the backrest 5.

On the other hand, when the backrest 5 returns from the backward tilted position to the initial position, the seat 4 is pushed forward following the forward tilt of the backrest 5 around the pivot 41. As a result, the seat 4 moves forward so as to follow the tilt of the backrest 5. Since the link arms 110 and 111 bridge between the housing bracket 101 and the seat 4, they move in the front-rear direction together with the seat 4 following the tilt of the backrest 5.

FIG. 10 is an explanatory view for explaining a method of switching the seat height, and is a side view corresponding to FIG.
As shown in FIGS. 8 and 10, when the seat 4 is lifted upward, the rear seat body 61 rotates upward around the axis Ob. Along with this, the link arms 110 and 111 rotate upward around the axes Op and Or. As a result, the front seat body 62 moves backward while moving upward. Further, the front seat body 62 rotates downward around the axes Oq and Os. As a result, the front seat body 62 is held above the rear seat body 61, and the seat surface of the front seat body 62 is held in a semi-standing position facing upward.

Even when two link arms 110 and 111 are used separately from the rear seat body 61 as in the present embodiment, the same effects as those in the above-described embodiment can be obtained.
In particular, in the present embodiment, the front side seat body 62 can be supported from below by the rear side seat body 61 and the link arms 110 and 111 in the semi-standing position, so that the robustness can be improved.

(Third Embodiment)
Next, a third embodiment according to the present invention will be described. FIG. 11 is a perspective view of the chair 200 according to the third embodiment as viewed from the front left. In the following description, the members corresponding to each of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
In the chair 200 shown in FIG. 11, the backrest 5 is configured by attaching the upholstery member 32 to the rectangular frame-shaped backrest frame 31 as in the above-described embodiment. The portion of the upholstery member 32 that spans the frame 31a on each side functions as a load-bearing surface that supports the load from the back when the seated person is seated.

12 and 13 are side views of the chair 200 according to the third embodiment.
As shown in FIGS. 12 and 13, the horizontal portion 31d of the backrest frame 31 functions as a grip portion that is separated rearward from the load-bearing surface of the tension member 32.
In the present embodiment, the length of the front main body 71 in the front-rear direction is longer than the length of the rear main body 63 in the front-rear direction.

FIG. 14 is a plan view of the chair 200 according to the third embodiment.
As shown in FIG. 14, the rear surface of the front main body 71 is a curved surface that is convex toward the rear. Specifically, the rear surface of the front main body 71 is formed following the front surface of the backrest 5 (the front surface of the backrest 5 facing the rear surface of the front main body 71 in the semi-standing position). .. As a result, in the semi-standing position (two-dot chain line in FIG. 14), the rear surface of the front main body portion 71 approaches or abuts on the front surface of the backrest 5.
On the other hand, the front surface of the rear main body 63 is a curved surface that is convex toward the rear. Specifically, the front surface of the rear main body 63 is formed following the rear surface of the front main body 71. As a result, at the basic position (solid line in FIG. 14), the rear surface of the front main body 71 comes close to or abuts on the front surface of the rear main body 63.

As shown in FIGS. 12 and 13, the rear seat body connecting portion 65 extends forward from the boundary portion between the rear main body portion 63 and the front main body portion 71. The rear seat body connecting portion 65 is connected to the front seat body connecting portion 72 via the seat body connecting pin 75 below the front main body portion 71. In the present embodiment, the front side seat connecting portion 72 is supported by the rear side seat connecting portion 65 via the seat connecting pin 75 so as to be rotatable and slidable.

The link arms 110 and 111 are bridged between the housing bracket 101 and the arm connecting portion 113 as in the second embodiment. The first link arm 110 is bent at an intermediate portion in the front-rear direction. Specifically, the first link arm 110 extends linearly toward the front and then extends upward toward the front. As a result, interference between the first link arm 110 and the rear seat body connecting portion 65 is avoided.

Here, the cover unit 201 is arranged below the seat 4. The cover 201 has a first cover 202 and a second cover 203. In the process of shifting the seat 4 between the basic position and the semi-standing position, the cover unit 201 shifts between the overlapping state in which the covers 202 and 203 overlap and the deployed state in which the covers 202 and 203 are deployed. do. The cover unit 201 covers the link arms 110, 111, the arm connecting portion 113, the front portion of the support base 3, and the like from both the lower and left and right sides in both the basic position and the semi-standing position.

The first cover 202 mainly covers the front portion of the support base 3 from the front. Specifically, the first cover 202 is formed in a fan shape when viewed from the left and right directions and in a C shape which opens rearward when viewed from the vertical direction. The rear end portion of the first cover 202 is rotatably supported around the axis Or by the second rear link shaft 140. A first engaging flange portion 202a projecting inward (rearward) of the first cover 202 is formed on the upper end edge of the first cover 202.

The second cover 203 mainly covers the front portion of the support base 3, the link arms 110 and 111, the arm connecting portions 113, and the like from the front and the bottom. The second cover 203 is formed in a triangular shape when viewed from the left and right directions and in a U shape which opens upward when viewed from the front and rear directions.

The rear portion of the second cover 203 covers the first cover 202 in the above-mentioned polymerization state (basic position of the seat 4). That is, the above-mentioned first cover 202 is invisible from the outside at the polymerization position. The rear portion of the second cover 203 is rotatably supported around the axis Or by the second rear link shaft 140. The front portion of the second cover 203 is configured to be rotatable around the axis Os by the second front link shaft 141 and to be slidable in the front-rear direction. That is, the cover 201 moves in synchronization with the second link arm 111 as the cover 201 shifts between the basic position and the semi-standing position.

A second engaging flange portion 203a projecting inward is formed on the rear end edge of the second cover 203. The second engaging flange portion 203a is configured to be able to engage with the first engaging flange portion 202a described above in the process of shifting the cover unit 201 from the polymerized state to the expanded state.

That is, in the process of shifting the seat 4 from the basic position to the semi-standing position, the second front link shaft 141 moves upward, so that the second cover 203 rotates upward around the axis Or. As a result, the second cover 203 is deployed with respect to the first cover 202. After that, the second engaging flange portion 203a of the second cover 203 engages with the first engaging flange portion 202a of the first cover 202 from below, so that the first cover 202 and the second cover 203 rotate around the axis Or. Rotates to. As a result, even in the semi-standing position, there is no gap in the boundary portion between the first cover 202 and the second cover 203. Therefore, in both the basic position and the semi-standing position, the cover unit 201 can collectively cover the front portion of the support base 3, the link arms 110, 111, the arm connecting portion 113, and the like.

As described above, in this embodiment, in addition to exhibiting the same effects as those of each of the above-described embodiments, the following effects are exhibited.
By making the length of the front main body 71 longer than the length of the rear main body 63, the seating surface area in the semi-standing position can be secured.

In the present embodiment, the rear seat body connecting portion 65 is extended below the front main body portion 71, so that the front seat body 62 is arranged above the rear seat body 61 in the semi-standing position. .. As a result, the seat height of the front seat body 62 in the semi-standing position can be increased as compared with the case where the connecting portions 65 and 72 are connected at the boundary portion between the rear main body portion 63 and the front main body portion 71. Therefore, it is possible to suppress a decrease in the seat surface height in the semi-standing position due to the reduction in the length of the rear main body portion 63.
Moreover, in the present embodiment, by extending the rear seat body connecting portion 65 to the lower side of the front main body portion 71, the rear side seat connecting portion 65 and the front seat connecting portion 72 are rearward from the connecting portion. The front main body 71 can be projected. As a result, in the semi-standing position, the rear end portion of the front main body portion 71 can be brought closer to the backrest 5.

In the present embodiment, since the cover unit 201 is arranged below the seat 4, the design can be improved. In particular, since the cover unit 201 moves in synchronization with the second link arm 111, the designability at both the basic position and the semi-standing position can be improved.

(Fourth Embodiment)
Next, a fourth embodiment according to the present invention will be described. 15 and 16 are side views of the chair 300 according to the fourth embodiment. The present embodiment differs from the above-described embodiment in that the seat 301 is covered with an integral upholstery member 313.
In the chair 300 shown in FIGS. 15 and 16, the support base 3 includes a seat support bracket 320 that protrudes upward from the support basic body 21 from the support basic body 21.
The seat 301 includes a rear seat body 310, an intermediate seat body 311 and a front seat body 312, and a tension member 313.

The rear seat body 310 is configured by attaching the cushion material 310b to the upper surface of the substrate 310a forming the skeleton portion. At the rear end of the substrate 310a, a support base connecting portion 310c projecting downward is formed. The support base connecting portion 310c is connected to the seat support bracket 320 described above via the seat rotation shaft 321. That is, the rear seat body 310 is rotatably supported by the support base 3 (seat support bracket 330) around the axis Ob along the left-right direction. In the present embodiment, the rear ends of the link arms 110 and 111 are also rotatably supported by the seat support bracket 320.

The intermediate seat body 311 is configured by attaching the cushion material 311b to the upper surface of the substrate 311a forming the skeleton portion. The length of the intermediate seat 311 in the front-rear direction is shorter than that of the rear seat 310 and the front seat 312. The rear end portion of the intermediate seat body 311 is rotatably connected to the front end portion of the rear side seat body 310 around the axis Ot along the left-right direction. The rear end surface of the intermediate seat body 311 is preferably close to or in contact with the front end surface of the rear side seat body 310 in the front-rear direction.

The front seat body 312 is configured by attaching the cushion material 312b to the upper surface of the substrate 312a forming the skeleton portion. The rear end portion of the front side seat body 312 is rotatably connected to the front end portion of the intermediate seat body 311 around the axis Au along the left-right direction. The front end surface of the intermediate seat body 311 is preferably close to or in contact with the rear end surface of the front side seat body 312 in the front-rear direction. The front end of the first link arm 110 is rotatably connected to the front seat body 312 around the axis Oq, and the front end of the second link arm 111 is rotatably connected around the axis Or. It is rotatably connected.

In this way, the rear seat body 310 and the front seat body 312 are rotatably connected to each other via the intermediate seat body 311. At the basic position of the seat 301, the upper surfaces of the cushioning materials 310b to 312b of the seat bodies 310 to 312 are arranged flush with each other.

The upholstery material 313 integrally covers each of the above-mentioned seat bodies 310 to 312. The upholstery material 313 is preferably formed of, for example, a stretchable material.

In the present embodiment, the backrest 5 has a side cover 325 extending forward from the extension 33. The side cover 325 covers the support base 3 (support basic body 21) from both sides in the left-right direction. The front end of the side cover 325 is connected to the pivot 326 of a reclining mechanism (eg, torsion unit 34) (for example, torsion unit 34) provided on the support base 21. As a result, the backrest 5 is configured to be rotatable around an axis along the left-right direction.

In the present embodiment, since each of the seats 310 to 312 is integrally covered with the upholstery member 313, it is possible to suppress the formation of a gap between the seats 310 to 312 adjacent to each other in the front-rear direction. As a result, the design can be improved. It should be noted that a restricting member for restricting the movement of the seat 301 from the semi-standing position to the basic position may be provided between any of the link arms 110 and 111 and the support base 3 separately from the link arms 110 and 111. good.

(Modification example)
In the fourth embodiment described above, the configuration in which the rear seat body 310 and the front seat body 312 are connected via the intermediate seat body 311 has been described, but the configuration is not limited to this configuration. For example, as shown in FIG. 17, the rear side seat body 310 and the front side seat body 312 may be connected via a bending and deformable connecting member 330. The connecting member 330 is formed in a bellows shape, for example. In the seat 301 according to this modification, when the connecting member 330 bends when shifting between the basic position and the semi-standing position, the rear side seat 310 and the front seat 312 are along the axis C1 in the left-right direction. Rotate around.

In the seat 301 shown in FIG. 18, the cushion material 310b of the rear seat body 310 and the cushion material 312b of the front seat body 312 are integrally attached to the upper surface of the same substrate 350. At the central portion of the substrate 350 in the front-rear direction (boundary portion of the cushion members 310b and 312b), for example, a bending starting point portion 350a thinner than the other portions is formed. In the seat 301 according to the present modification, when the substrate 350 is bent from the bending starting point 350a when shifting between the basic position and the semi-standing position, the rear seat 310 and the front seat 312 are bent. It rotates around the axis C2 along the left-right direction.

(Fifth Embodiment)
Next, a fifth embodiment according to the present invention will be described. 19 and 20 are side views of the chair 400 according to the fifth embodiment. This embodiment differs from the above-described embodiment in that the rear seat body 401 functions as a seating surface in a semi-standing position.
In the chair 400 shown in FIGS. 19 and 20, the support base 3 includes a seat support bracket 402 extending forward from the support basic body 21. The seat support bracket 402 extends upward toward the front. The front end of the front seat body 410 is rotatably connected to the front end of the seat support bracket 402 around the axis Ov along the left-right direction.

The rear seat body 401 is connected to the front side seat body 410 via the intermediate seat body 311 described above. The rear seat body 401 includes an arm connecting portion 411 that projects downward from the substrate 310a. A first link arm 420 and a second link arm 421 are bridged between the arm connecting portion 411 and the seat support bracket 402. The rear seat body 401 is supported by the backrest 5 from below at the basic position shown in FIG.

The rear end portion of the first link arm 420 is rotatably supported by the arm connecting portion 411 around the axis line Ow along the left-right direction. The front end portion of the first link arm 420 is rotatably supported by the seat support bracket 402 around the axis Ox along the left-right direction.
The rear end portion of the second link arm 421 is rotatably supported by the arm connecting portion 411 around the axis line Oy along the left-right direction. The front end portion of the second link arm 421 is rotatably supported by the seat support bracket 402 around the axis Oz along the left-right direction.

As described above, the chair 400 of the present embodiment constitutes a so-called four-bar link mechanism in which the seat support bracket 402 is a fixed link and the arm connecting portions 411 and the link arms 420 and 421 are movable links.

In the present embodiment, in order to position the seat 430 in the semi-standing position shown in FIG. 20, the rear seat body 401 in the state shown in FIG. 19 is pulled up diagonally forward and upward. Then, the rear side seat body 401 rotates around the axis Ot with respect to the intermediate seat body 311 and the front side seat body 410 rotates around the axis Ou with respect to the intermediate seat body 311. Along with this, the link arms 420 and 421 rotate around the axes Ox and Oz with respect to the seat support bracket 402. Further, the link arms 420 and 421 rotate around the axes Ow and Oy with respect to the rear seat body 401. As a result, as shown in FIG. 20, the rear seat 401 moves to the semi-standing position. That is, in the semi-standing position, the front seat body 410 extends rearward as it goes upward, and the seat surface of the rear seat body 401 faces upward. At this time, the seating surface of the front seat body 410 faces forward.

As described above, in the present embodiment, since the seating surface of the front seat body 410 faces forward in the semi-standing position, the thigh of the seated person seated in the semi-standing position is determined by the seating surface of the front seat body 410. Can be supported from behind. Thereby, in the semi-standing position, the seat 400 can support the seated person from the buttocks to the thighs (the region extending to the vicinity of the knees). As a result, it is possible to improve the comfort when sitting in the semi-standing position.

The technical scope of the present invention is not limited to the above-described embodiments, but includes various modifications to the above-described embodiments without departing from the spirit of the present invention. That is, the configuration and the like given in the above-described embodiment are only examples, and can be changed as appropriate.
In the above-described embodiment, the configuration for switching between the basic position and the semi-standing position by the four-section link mechanism has been described, but the configuration is not limited to this configuration. That is, the front seat body 62 may be positioned above the rear seat body 61 by the upward rotation of the rear seat body 61, and the downward movement of the front seat body 62 may be restricted. For example, in the first embodiment described above, the length of the link arm 23 or the like may be changed, and the seating surface of the front seat body 62 in the semi-standing position may be tilted forward or backward.

In the above-described embodiment, the configuration in which the link arm is adopted as the regulating member of the present invention has been described, but the configuration is not limited to this configuration. That is, the regulating member can be appropriately changed as long as it has a configuration that restricts the downward movement of the front seat body 62 in the semi-standing position. In this case, the regulating member may be configured to be rotatably supported by one of the front seat body 62 and the backrest bracket 35 so that it can be connected to the other member in a semi-standing position. Even with such a configuration, since the regulating member is bridged between the front seat body 62 and the support basic body 21 in the semi-standing position, the robustness can be improved.
Further, the regulating member does not have to be configured to bridge between the front seat body 62 and the backrest bracket 35. For example, the regulating member may be a beam member or the like that extends cantilevered along the front seat body 62 from the rear seat body 61 or the like.

For example, in the first embodiment, the outer circumference of the front rotating shaft 76 may be covered with an elastic member such as rubber. In this case, an elastic member is interposed between the front rotation shaft 76 and the link arm 23. Therefore, when the seating load is input to the front seat body 62, the elastic member is elastically deformed, so that the front seat body 62 rotates around the axis Occ. Thereby, the angle of the front seat body 62 can be changed according to the seating load.
In the above-described embodiment, the configuration in which the backrest 5 includes the backrest frame 31 and the upholstery member 32 has been described, but the configuration is not limited to this configuration. For example, the backrest may be composed of a cushion body that functions as a load supporting surface and a cover member that covers the back of the cushion body. In this case, for example, a grip portion protruding rearward or upward may be provided at the upper end portion of the cover member.

In addition, it is possible to replace the constituent elements in the above-described embodiments with well-known constituent elements as appropriate without departing from the spirit of the present invention, and each of the above-described modifications may be appropriately combined.

1,100,200,300,400 ... Chair 4,301 ... Seat 21 ... Support basic body (support structure)
23 ... Link arm (regulatory member)
31d ... Horizontal part (grip part)
32 ... Upholstery material (load support surface)
35 ... Backrest bracket (support structure)
61, 310 ... Rear seat (first seat)
62, 312 ... Front seat (second seat)
71a ... Inclined portions 110, 420 ... First link arm (regulatory member)
111,421 ... 2nd link arm (regulatory member)
401 ... Rear seat (second seat)
402 ... Seat support bracket (support structure)
410 ... Front seat (first seat)
Oa, Op, Or, Ow, Oy ... Axis (3rd axis, 4th axis)
Ob, Ov ... Axis (1st axis)
Oct, Ot, Ou, C1, C2 ... Axis (second axis)
Od, Oq, Os, Ox, Oz ... Axis (4th axis, 3rd axis)

Claims (6)

Support structure and
Accumbens body after being supported rotatably the support structure about a first axis along the width direction, and is disposed forward relative to the rear seat body, the width to the rear seat body A seat having a front seat body rotatably configured around the second axis along the direction,
A regulatory member that regulates the downward movement of the seat is provided.
The seat is
The first seating position in which the seating surface of the rear seating body and the seating surface of the front seating body are connected to form the first seating surface, and
The rear seat is arranged so as to extend upward from the first axis, the front seat is located above the rear seat, and the seating surface of the front seat constitutes the second seating surface. It changes to the second seating position,
The regulating member is a chair that regulates the downward movement of the front seat body at the second seating position. The first end portion of the regulation member is rotatably supported by one of the support structure and the front seat body around the third axis along the width direction.
1. The second end portion of the regulation member is configured to be connectable to any one of the support structure and the front seat body at the second seating position. The chair described in. The chair according to claim 2, wherein the second end portion of the regulating member is rotatably supported by the other member about the fourth axis along the width direction. Any one of claims 1 to 3, wherein at the first seating position, the length of the front seat body in the depth direction is shorter than the length of the rear seat body in the depth direction. The chair described in. Before seating surface of SL front seat body, the chair according to claims 1 to any one of claims 4, characterized in that it comprises an inclined portion inclined downward toward the front. With a backrest supported by the support structure,
The backrest is
A load-bearing surface that supports the load of the seated person,
The chair according to any one of claims 1 to 5, further comprising a grip portion that is separated rearward from the load-bearing surface.

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