JP2885306B2 - Reclining device for vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining device for a vehicle seat, and more particularly to an improvement in the structure of an internal toothed pole swing type reclining device.

[0002]

2. Description of the Related Art Among the reclining devices for seats, the internal-tooth type pole swing type is compact in shape as compared with the externally-toothed type, and has less backlash as compared with the one in which the pole slides. FIG. 10 shows an example (for example, Japanese Utility Model Laid-Open No. Sho 62-46036). In the drawing, a support shaft 2 is erected on a plate surface at one end of a lower arm 1 ′ installed on a seat cushion side, and extends along an outer peripheral edge of a plate surface that forms an arc around the support shaft 2. An internal gear member 13 is provided. The upper arm 3 ′ installed on the seat back side has a center hole 34 of a lower circular portion that is rotatably fitted to the support shaft 2 and is positioned in contact with the lower arm 1 ′.
5 is urged to rotate clockwise in the figure by a spiral spring 8 provided between the shaft 5 and the support shaft 2. A pole member 4 ′ is provided along the back surface of the upper arm 3 ′, and the upper end of the pole member 4 ′ extends to a position outside the arc of the internal gear member 13, and is pivotally connected to the plate surface of the upper arm 3 ′ by a pin 43. The lower end is bent forward through a long hole 44 provided in the plate surface of the upper arm 3 ′, and is located inside the arc of the internal gear member 13. A tooth profile 4 a is formed on the lower side surface of the pole member 4 ′, and the tooth profile 4 a faces the tooth profile 13 a of the internal gear member 13. The pole member 4 '
Is pivotally mounted about the pin 43 by an operation lever 5 'located between the upper arm 3' and the lower arm 1 'so that the base end of the internal gear member 13 is rotatably mounted on the support shaft 2. When approaching, the tooth profiles 4a and 13a are meshed with each other to prevent free rotation of the upper arm 3 'with respect to the lower arm 1'.

[0003]

By the way, in the above-mentioned conventional reclining device, an internal gear member 13 having a constant thickness is joined to the plate surface of the lower arm 1 ', and the upper arm 3
Since the lower end of the pole member 4 'that bends to the front through the elongated hole 44 from the back of the' is opposed to each other, the entire device becomes thick and lacks compactness. There is also a problem that it takes time to bend the pole member 4 ′ and adjust the position between the bent lower deformed tooth profile 4 a and the internal gear member 13 tooth profile 13 a.

An object of the present invention is to provide a reclining device for a vehicle seat in which the whole device is thin and compact, and the labor for manufacturing and assembling can be reduced.

[0005]

According to the structure of the first aspect, a pair of plate-like lower arms 1 provided on the seat cushion side are provided.
A, 1B and the lower arms 1A, 1B are positioned so as to be in contact with the plate surface so as to be sandwiched between the lower arms 1A, 1B. A part of the inner peripheral surface of the opening 31 is a plate-shaped upper arm 3 having an arc surface forming a tooth profile 3a around the support shaft 2; A plate-shaped pole member 4 having a tooth profile 4a formed on an opposite end surface, a pin member 41 projecting outward from a plate surface of the pole member 4 through a long hole 11 provided in one of the lower arms 1A and 1B, The pin member 41 is rotatably supported by the lower arm 1A, 1B plate surface located outside the arcuate surface so as to be rotatable. A supporting arm 6 that rotates. As the forward and reverse rotation of the over arm 6, the pole member 4 is close to or away from the said arcuate surface,
The two tooth profiles 3a and 4a are engaged or disengaged.

According to the second aspect of the invention, the lower arms 1A, 1B provided on the seat cushion side and the lower arms 1A, 1B are rotatably supported by the support shaft 2, and are mounted on the plate surfaces of the lower arms 1A, 1B. The lower arm 1A is provided with a concave portion 34 on a side surface in contact with the plate surface, and a part of the inner peripheral surface of the concave portion 34 is formed with a tooth profile 3a centered on the support shaft 2. A plate-like upper arm 3 having an arcuate surface, a plate-like pole member 4 disposed in the recess 34, and having a tooth shape 4a formed on an end surface facing the arcuate surface; Lower arm 1
A pin member 43 protruding outward through the elongated hole 11 provided in each of A and 1B, and the pin member 43 is coupled to the distal end, and the base end pivots on the lower arm 1A plate surface located outside the arc surface. A support arm 6 that is freely rotatably supported and rotates forward and backward in accordance with forward and reverse rotation operations of the release arm 5, and the pole member 4 is rotated by the forward and reverse rotation of the support arm 6. By approaching or separating from the surface, the two tooth profiles 3a, 4a mesh with each other or cancel the meshing.

In the structure of the third aspect, the back of the pawl member 4 is pressed toward the arc surface when the release arm 5 is normally rotated, and the back of the pawl member 4 is pressed when the release arm 5 is operated in the reverse direction. It further includes cam members 7 and 9 which are separated from the arc surface and are separated from the arc surface.

According to a fourth aspect of the present invention, the cam member is provided rotatably around the support shaft, and the release arm is provided with the cam member.
The cam member 9 pivots behind the pawl member 4 or pivots away from the back of the pawl member 4 in conjunction with the forward and reverse rotation of.

[0009]

According to the first aspect of the present invention, since the plate-shaped pole member is located in the opening provided in the plate surface of the upper arm, the plate thickness of the pole member does not add to the thickness of the entire apparatus, and the plate is compact. Device is realized. Further, since the pole member 4 is connected to the support arm 6 provided on the opposite side of the lower arm 1A by the pin member 41 penetrating through the elongated hole 11 of the lower arm 1A, the pole member 4 itself is connected as in the related art. It is not necessary to perform the bending forming, and the labor of the molding and the assembling adjustment for making the meshing with the tooth shape 3a of the arc surface good can be reduced. Further, since the left and right lower arms 1A and 1B are provided in a pair and the upper arm 3 and the pawl member 4 are sandwiched therebetween, the meshing of the tooth profiles 3a and 4a can be surely achieved.

According to the second aspect of the present invention, since the plate-shaped pole member 4 is disposed in the recess 34 provided on the side surface of the upper arm 3, the apparatus can be made more compact.
Since the recess 34 is used instead of the opening 31 of the first aspect, the upper arm 3 is unlikely to be deformed during heat treatment or the like.

According to the third aspect of the present invention, the cam member 7,
9, the pawl member 4 is pressed toward the arc surface of the upper arm 3, and the meshing of the tooth profiles 3a, 4a is reliably ensured.

In the structure of the fourth aspect, the pole member 4
The movement of the cam member 9 to or from behind is smoothly performed.

[0013]

Embodiment 1 In FIGS. 1 and 2, an upper arm 3 is a plate-like body and an upper end is fixed to a frame S of a seat back. The upper arm 3 is provided with a through hole 32 at the center, and one side edge of the through hole 32 bulges outward in an arc shape.
A fan-shaped opening 31 is formed on the plate surface of the bulging portion. The outer peripheral surface of the opening 31 forms an arc surface centered on the through hole 32, and a large number of tooth shapes 3a are formed here. ing.

Lower arms 1A and 1B are disposed on both sides of the upper arm 3, and these lower arms 1A and 1B are plate-like members extending in the front-rear direction (the left-right direction in FIG. 2), and the lower edges are welded to each other ( FIG. 3) The upper rail R of the seat track. The left and right lower arms 1A, 1B are in contact with each other, and the upper arms 3 are slidably sandwiched between the lower arms 1A, 1B. The arm 3 is rotatable between the lower arms 1A and 1B. The support shaft 2 is prevented from falling off by an E-ring 81, and one end of a spiral spring 8 is locked at the tip thereof, and the other end of the spring 8 is locked to the cut-and-raised piece 33 of the seat back frame S, thereby forming an upper arm. 3 is urged counterclockwise in FIG.

In the opening 31 of the upper arm 3, a plate-shaped pole member 4 and a plate-shaped cam member 7 are disposed in contact with the arc-shaped side surface thereof. It is in contact with the inner peripheral arc surface of the opening 31. Thus, the tooth profile 4a formed on one side surface of the pole member 4 meshes with the tooth profile 3a of the opening 31 arc surface while being pressed by the cam member 7 (FIG. 4). Square holes 42 and 61 are provided at the distal ends of the pole member 4 and the support arm 6 that supports the pole member 4, respectively. Square pins 41 penetrating the elongated holes 11 of the lower arms 1A and 1B are press-fitted into the square holes 42 and 61, respectively. I have. The foremost cylindrical portion of the square pin 41 is located in an elongated hole 51 provided on the base plate surface of the release arm 5. The circular projection 71 provided on the plate surface of the cam member 7 is fitted into the round hole 52 provided on the plate surface of the release arm 5 via the elongated hole 11 of the lower arm 1A. The base end of the support arm 6 is rotatably connected to both lower arms 1A and 1B by a pin member 62.

The release arm 5 has a through hole 5 at its base end.
3 so as to be rotatably fitted to the support shaft 2 and
A coil spring 54 disposed between the intermediate position of the arm 5 and the lower arm 1A is urged to rotate counterclockwise in FIG.

When the inclination angle of the seat back is changed in the reclining device having the above structure, the tooth shape 4a of the pawl member 4 and the tooth shape 3a of the upper arm opening 31 are engaged to prevent the rotation of the upper arm 3 in FIG. In this state, the release arm 5 is rotated upward against the coil spring 54. Along with this operation, as shown in FIG. 5A, the cam member 7 slides on the inner circular arc surface of the opening 31 and moves upward integrally and separates from behind the pole member 4. When the release arm 5 is further rotated upward, as shown in FIG. 5 (2), the long hole 51 of the release arm 5 and the long hole 1 of the lower arm 1A which bend away from the tooth shape 3a of the opening 31.
The support arm 6 is turned so that the square bolt 41 is always present at the intersection with the pole 1, the pole member 4 is separated from the arc surface of the opening 31, and the meshing of the two teeth 3 a, 4 a is canceled. Thereby, the upper arm 3 can freely rotate. When the release lever 5 is released after the seatback S is tilted to a predetermined position, the release lever 5 is rotated downward by the coil spring 54, and the support arm 6 pivots in the opposite direction to form the tooth shape of the pole member 4. 4a meshes with the tooth profile 3a of the opening 31 again. At this time, the cam member 7 moves again behind the pawl member 4 as shown in FIG. 1 and presses the same toward the circular arc surface, thereby assuring a reliable engagement between the two tooth profiles 33a and 4a.

According to the apparatus of this embodiment, the upper arm 3
Since the pole member 4 is located within the opening 31, the plate thickness of the pole member 4 does not add to the thickness of the apparatus, and the whole can be made thin and compact. Further, since the pole members 4 and the support arms 6 located on both sides of the lower arm 1A are connected and integrated by the square pins 41, it is not necessary to bend and form a long plate-shaped pole member as in the related art. ,
Further, the labor for assembling and adjusting the bent tooth profile is reduced. Further, since the plate-shaped upper arm 3 and the pole member 4 are sandwiched between the plate-shaped lower arms 1A and 1B from the left and right, the meshing of the tooth shapes 3a and 4a of both can be surely and firmly made.

[0019]

Second Embodiment In FIGS. 6 and 7, the cam member 9 has a base end formed into a circular ring shape and is rotatably fitted to the support shaft 2. And, a circular projection 9 protruding from the end plate surface.
1 is a release arm 5 through a long hole 11 of the lower arm 1A.
Is fitted in a round hole 52 provided in the plate surface of the second plate.

With such a structure, the cam member 9 is freely rotated around the support shaft 2 between the position behind the pole member 4 and a position outside of the pole member 4 in accordance with the rotation operation of the release arm 5, and the cam member 9 is smoothly rotated. Operation becomes possible.

[0021]

Third Embodiment Referring to FIGS. 8 and 9, instead of the opening 31 of the first embodiment, a concave portion 34 having the same fan shape is formed on the plate surface of the upper arm by half pressing to form an arc surface thereof. A tooth profile 3a is formed on the outer peripheral surface. In the recess 34, a plate-shaped pole member 4 having a tooth profile 4a meshing with the tooth profile 3a, and a plate-shaped cam member 7 contacting behind the pole member 4 are disposed. A square pin 43 is press-fitted into the square hole 42 of the pole member 4, penetrates the long hole 11 of the lower arm 1 </ b> A and is press-fitted into the square hole 42 at the tip of the support arm 6, and the column at the tip is released. The arm 5 is located in an elongated hole 51 provided on the base plate surface.

With this structure, the release arm 5
The pole member 4 and the tooth forms 3a, 4a on the arc surface of the upper arm 3 mesh or disengage in accordance with the turning operation of
The same operation and effect as those of the first embodiment can be obtained. In the present embodiment, since the concave portion 34 is formed in the upper arm 3 instead of the opening 31, it is possible to avoid the possibility that the upper arm 3 is deformed due to distortion or the like when heat-treated. According to this structure, the lower arm 1B may be omitted if sufficient supporting strength can be ensured.

[0023]

As described above, the reclining device of the present invention is compact and easy to assemble.

[Brief description of the drawings]

FIG. 1 is a side view of a reclining device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the reclining device.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a side view showing the operation of the reclining device.

FIG. 6 is an exploded perspective view of a reclining device according to a second embodiment of the present invention.

FIG. 7 is a side view of a main part of the reclining device.

FIG. 8 is an exploded perspective view of a reclining device according to a third embodiment of the present invention.

FIG. 9 is a horizontal sectional view of the reclining device.

FIG. 10 is an exploded perspective view of a reclining device showing a conventional example.

[Explanation of symbols]

 1A, 1B Lower arm 11 Long hole 2 Support shaft 3 Upper arm 3a Tooth shape 31 Opening 34 Recess 4 Pole member 4a Tooth shape 41 Square pin 5 Release arm 6 Support arm 7, 9 Cam member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-128707 (JP, A) JP-A-3-101244 (JP, U) JP-A-59-148646 (JP, U) JP-A 62- 46036 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47C 1/025

Claims (4)

(57) [Claims] 1. A pair of plate-like lower arms provided on a seat cushion side, and a pair of left and right lower arms positioned so as to be in contact with the plate surfaces thereof. The lower arms are rotatably supported by a support shaft and have openings. A part of the inner peripheral surface of the opening, a plate-shaped upper arm having an arc surface forming a tooth profile centered on the support shaft, and an end surface disposed in the opening and facing the arc surface. A plate-shaped pole member having a tooth profile, a pin member projecting outward from a plate surface of the pole member through an elongated hole provided in one of the lower arms, and the pin member is coupled to a distal end, and the base end is A support arm rotatably supported on a lower arm plate surface located outside the arc surface and being operated by a release arm to rotate forward and backward, and the pole member Is relative to the arc surface A reclining device for a vehicle seat, in which the two tooth shapes are engaged or disengaged when approaching or separating from each other. 2. A lower arm provided on a seat cushion side, a lower arm rotatably supported by a support shaft, and positioned in contact with a plate surface of the lower arm, and a concave side surface in contact with the lower arm plate surface. A part of the inner peripheral surface of the recess is provided, a plate-shaped upper arm having an arcuate surface forming a tooth profile centered on the support shaft, and disposed in the recess, the arcuate surface being provided. A plate-shaped pole member having a tooth profile formed on the opposite end surface, a pin member projecting outward from a plate surface of the pole member through an elongated hole provided in the lower arm, and the pin member coupled to the distal end; And a support arm rotatably supported by a lower arm plate surface located outside the circular arc surface and operated to rotate forward and reverse by a release arm. With the forward and reverse rotation of the support arm, The pole member is the above arc surface A reclining device for a vehicle seat, in which the two tooth forms are brought into or out of contact with each other or disengaged from each other. 3. When the release arm is rotated forward, the back of the pole member is pressed toward the arc surface,
3. The reclining device for a vehicle seat according to claim 1, further comprising a cam member that separates from the back of the pawl member and allows the pawl member to separate from the arc surface when the release arm reversely rotates. 4. The cam member is rotatably provided around the support shaft, and the cam member rotates behind the pawl member in conjunction with forward / reverse rotation of the release arm, or behind the pawl member. The reclining device for a vehicle seat according to claim 3, wherein the reclining device rotates so as to be separated from the vehicle seat.