JP5250053B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and particularly to a vehicle seat provided with a folding seat back.

  In the power comfort seat structure disclosed in Patent Document 1 below, a folding seat back is coupled to the rear end portion of the seat cushion frame via a reclining mechanism. The lower half portion of the seat back includes left and right side frames, and an intermediate portion of a link formed in a substantially square shape is rotatably connected to upper ends of these side frames. At the rear end of the link is a lower frame that forms part of the upper half of the seatback. At the front end of the link, the upper end of the connecting arm (connecting means) can be rotated. It is connected. The lower end of the connecting arm is rotatably connected to the seat cushion frame. When the lower half of the seat back tilts backward with respect to the seat cushion frame, the upper half of the seat back is pulled by the connecting arm. The upper half is inclined forward with respect to the lower half. Thus, the seated person's head is prevented from tilting backward as the seat back is tilted backward, and the seated person's fatigue is reduced.

JP-A-8-11603

  However, in the power comfort seat structure configured as described above, the pipe-shaped frame that forms the skeleton of the upper half of the seat back is connected to the side frame of the lower half via a plate-shaped link. It is considered that the rigidity of the seat back is reduced at the part. For this reason, for example, when a load from the seat occupant to the vehicle rear side is applied to the seat back due to a rear-end collision of the vehicle, between the upper half frame and the lower half side frame of the seat back. The link may be deformed. In this case, the upper half of the seat back tilts backward with respect to the lower half, and the headrest attached to the upper portion of the seat back is separated from the head of the seated person. As a result, since the seated person's head is not quickly supported by the headrest, there is room for improvement in preventing or reducing the whipping disorder in the seated person's neck.

  The present invention has been made in consideration of the above-described facts, and an object of the present invention is to provide a vehicle seat that can reduce fatigue of a seated person and can prevent or reduce whipping damage to the neck of the seated person.

In the vehicle seat according to the first aspect, the lower portion of the back frame is connected to the seat cushion frame so as to be reclining, and the upper portion of the back frame having the headrest connected to the upper end portion is connected to the seat via the connecting means. The back frame is connected to a cushion frame side, and includes a folding seat back frame in which the upper portion of the back frame leans forward with respect to the lower portion of the back frame in conjunction with the backward inclination of the lower portion of the back frame with respect to the seat cushion frame. The upper part is a connecting shaft in which the frame main body is formed of a pipe material, and the lower ends of the pair of left and right side parts constituted by the pipe material pass through the pipe material with respect to the upper ends of the lower part of the back frame , respectively. It is characterized by being connected rotatably through

  In the vehicle seat according to claim 1, the lower portion of the back frame of the seat back frame is connected to the seat cushion frame so as to be reclining, and the lower end portion of the upper portion of the back frame is connected to the upper end portion of the lower portion of the back frame. It is rotatably connected via a shaft. The upper portion of the back frame is connected to the seat cushion frame side via connecting means. When the lower portion of the back frame is tilted backward with respect to the seat cushion frame, the upper portion of the back frame is inclined forward with respect to the lower portion of the back frame. Thereby, since the burden of the muscle of the seated person who is drowning in the seat back can be minimized, the fatigue of the seated person can be reduced.

In addition, this vehicle seat has a frame body in which the upper portion of the back frame is formed of a pipe material, and the lower end portions of the pair of left and right side portions of the frame body are relative to the upper end portion of the lower portion of the back frame. These are connected rotatably through connecting shafts penetrating the pipe material . As described above, since the pipe material constituting the frame main body of the upper portion of the back frame and the lower portion of the back frame are directly connected by the connecting shaft, it is possible to avoid a decrease in the rigidity of the seat back frame at the connecting portion. . Thereby, since the rearward tilt of the upper part of the back frame at the time of a rear collision of the vehicle is suppressed, the head of the seated person can be quickly supported by the headrest connected to the upper end part of the upper part of the back frame. Therefore, it is possible to prevent or reduce the lashing injury of the neck of the seated person.

A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein each lower end portion of the pair of side portions is formed in a circular cross section, and the connecting shaft is the circular shape. It is characterized by passing through the cross section in the radial direction.

In the vehicle seat according to claim 2, the upper portion of the back frame has a circular cross section at the lower end of the pair of left and right side portions of the frame main body formed by the pipe material, and penetrates the circular cross section in the radial direction. The upper part of the back frame and the lower part of the back frame are connected by the connecting shaft. In this way, the rigidity of the pipe material is reduced by maintaining the circular cross section without flattening the cross section of the lower end portion of the frame body (pipe material), that is, the connection portion to the lower portion of the back frame. Can be prevented. Thereby, it can suppress more favorably that the rigidity of a seat back frame falls in the connection part of a back frame upper part and a back frame lower part.

The vehicle seat according to a third aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the lower portion of the back frame includes a pair of left and right side frames and upper ends of the pair of side frames. and a reinforcing frame connecting part, said frame body of said back frame top, each lower end portion of the pair of side portions via the connecting shaft respectively for each upper end of the pair of side frames are connected, said connecting means, rotation and upper bracket fixed to one of said pair of side portions, is rotatably connected an upper end to said upper bracket, a lower end to the seat cushion frame side And a link member connected in a possible manner.

  In the vehicle seat according to claim 3, each upper end portion of the pair of left and right side frames constituting the lower portion of the back frame and each lower end portion of the pair of left and right side portions constituting the frame main body (pipe material) in the upper portion of the back frame. Are connected via a connecting shaft. An upper bracket is fixed to one of the pair of left and right side portions, and an upper end portion of a link member is rotatably connected to the upper bracket. The lower end portion of the link member is rotatably connected to the seat cushion frame side, and when the lower portion of the back frame tilts backward with respect to the seat cushion frame, the upper portion of the back frame is pulled by the link member. Thereby, the back frame upper part inclines forward with respect to the back frame lower part.

  Here, in this vehicle seat, a cantilever structure in which only one of a pair of left and right side portions constituting the frame body above the back frame is connected to the seat cushion frame side via an upper bracket and a link member; Has been. As a result, the number of parts can be reduced, and the cost of the vehicle seat can be reduced. In addition, since the upper ends of the pair of left and right side frames constituting the lower portion of the back frame are connected by the reinforcement frame, it is possible to avoid the rigidity of the seat back frame from being lowered by the cantilever structure.

A vehicle seat according to a fourth aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the lower portion of the back frame has a pair of left and right side frames, The frame body has lower ends of the pair of side portions connected to the upper ends of the pair of side frames via the connection shafts, respectively , and the connecting means includes the pair of side portions. A pair of left and right upper brackets fixed to each other, and a pair of left and right link members each having an upper end rotatably connected to each of the pair of upper brackets and each lower end rotatably connected to the seat cushion frame side It is characterized by having.

  In the vehicle seat according to claim 4, each upper end portion of the pair of left and right side frames constituting the lower portion of the back frame and each lower end portion of the pair of left and right side portions constituting the frame main body (pipe material) in the upper portion of the back frame. Are connected via a connecting shaft. Further, upper brackets are respectively fixed to the pair of left and right side portions, and upper ends of link members are rotatably connected to these upper brackets. The lower end portion of each link member is rotatably connected to the seat cushion frame side, and when the lower portion of the back frame is tilted backward with respect to the seat cushion frame, the upper portion of the back frame is pulled by each link member. Thereby, the back frame upper part inclines forward with respect to the back frame lower part.

  Here, in this vehicle seat, both the pair of left and right side portions constituting the frame main body on the upper part of the back frame are both connected to the seat cushion frame side via the pair of left and right upper brackets and the pair of left and right links. It has a holding structure. For this reason, when a load from the occupant to the rear side is applied to the seat back, the pair of left and right link members bear a part of the load, so that the upper portion of the back frame is well balanced on both the left and right sides. Can be supported.

  As described above, the vehicle seat according to the present invention can reduce the fatigue of the seated person and can prevent or reduce the whipping disorder of the neck of the seated person.

It is a perspective view which shows the structure of the principal part of the vehicle seat which concerns on embodiment of this invention. It is a disassembled perspective view of the peripheral member containing the seat back frame shown by FIG. FIG. 3 is an enlarged cross-sectional view showing a cut surface along line 3-3 in FIG. 1. The structure of the seat cushion frame and seat back frame which concerns on embodiment of this invention is shown, (A) is a side view which shows the state which the seat back frame stood up, (B) is the state which the seat back frame inclined backwards. FIG. It is a perspective view which shows the structure of the conventional standard seat back frame.

  Hereinafter, the vehicle seat 10 according to the embodiment of the present invention will be described with reference to FIGS. In addition, the arrow FR, arrow UP, and arrow W which are suitably shown in each figure have shown the front direction, the upper direction, and the width direction of the vehicle seat 10, respectively. In the present embodiment, the front direction, the upper direction, and the width direction of the vehicle seat 10 are substantially the same as the front direction, the upper direction, and the width direction of the vehicle on which the vehicle seat 10 is mounted.

  As shown in FIG. 1, a vehicle seat 10 according to the present embodiment includes a seat cushion 12 that supports a seated person's buttocks and thighs, and a rear end portion of the seat cushion 12 via a reclining mechanism 14. The seat back 16 is connected to support the back of the seated person, and the headrest 18 is connected to the upper end of the seat back 16 and supports the head of the seated person.

  The seat cushion 12 includes a seat cushion frame 20 constituting the skeleton, and a seat cushion pad (not shown) covered with an outer skin 22 is attached to the seat cushion frame 20.

  The seat cushion frame 20 connects a pair of left and right side frames 24, 26 extending in the front-rear direction of the seat, a front frame 28 connecting the front ends of the side frames 24, 26, and the rear ends of the side frames 24, 26. The rear frame 30 is configured. The side frames 24 and 26 and the front frame 28 are made of sheet metal material, and the rear frame 30 is made of a metal pipe material having a circular cross section.

  Frames 32 and 34 constituting the reclining mechanism 14 are fastened and fixed to the rear ends of the side frames 24 and 26 by bolts and nuts. These frames 32 and 34 are made of sheet metal material, and a link bracket 36 is further fixed to the frame 34 on the right side of the seat. The link bracket 36 is made of a sheet metal material and protrudes obliquely upward from the frame 34 on the front side of the seat.

  On the other hand, the seat back 16 is formed by a combination of the separated seat back upper part 16A and the seat back lower part 16B, and the seat back frame 38 constituting the skeleton thereof is separated from the back frame upper part 38A and the back frame lower part. It is formed in a folding type consisting of a combination with 38B. A seat back pad upper part (not shown) covered by the skin 40 is attached to the back frame upper part 38A, and a seat back pad lower part (not shown) covered by the skin 42 is attached to the back frame lower part 38B. It has been.

  As shown in FIG. 2, the back frame lower portion 38 </ b> B is formed on a pair of left and right side frame bodies 44, 46 extending in the vertical direction of the seat back 16, and on the inner side surface in the seat width direction at each upper end portion of the side frame bodies 44, 46. A pair of joined left and right hinge brackets 50, 52, a reinforcement pipe 54 (reinforcement frame) connecting the upper ends of the hinge brackets 50, 52, and a lower plate 48 connecting the lower ends of the side frame bodies 44, 46. And.

  The side frame bodies 44 and 46, the hinge brackets 50 and 52, and the lower plate 48 are made of a sheet metal material, and the reinforcing pipe 54 is made of a metal pipe material having a circular cross section. The lower plate 48 and the hinge brackets 50 and 52 are joined to the side frame main bodies 44 and 46 by spot welding or the like. The side frame main bodies 44 and 46 and the hinge brackets 50 and 52 constitute side frames 51 and 53 of the back frame lower portion 38B. Further, both end portions of the reinforcing pipe 54 in the longitudinal direction are flattened, and these flat portions are welded to the rear surfaces of the side frame main bodies 44 and 46.

  The lower end portions of the side frame main bodies 44 and 46 are overlapped in the seat width direction with respect to the frames 32 and 34 described above, and the frame 32, via a pair of left and right recliners (not shown) constituting the reclining mechanism 14. 34. The reclining mechanism 14 is well known in the art. When the connecting shaft 56 spanned between the lower ends of the side frame main bodies 44 and 46 is rotated around the axis along the seat width direction, The planetary gear mechanism provided in the reclining unit rotates, and the back frame lower portion 38B of the seat back frame 38 tilts forward and backward with respect to the seat cushion frame 20.

  On the other hand, the back frame upper portion 38A includes an upper frame 58 (frame main body) formed by bending a metal pipe member having a circular cross section into a substantially inverted U shape. The upper frame 58 includes a pair of left and right side portions 58A and 58B and an upper portion 58C in which the upper ends of the side portions 58A and 58B are connected.

  A pair of left and right headrest support brackets 60 are welded to the upper portion 58C. A headrest support 61 is mounted on each of the headrest support brackets 60, and a headrest frame 62 that constitutes the skeleton of the headrest 18 is connected to the headrest support 61. The intermediate portions in the vertical direction of the side portions 58A and 58B are connected (reinforced) by an upper plate 64 formed of a sheet metal material.

  The lower ends of the side portions 58A and 58B are overlapped on the outer side in the seat width direction with respect to the hinge brackets 50 and 52 of the back frame lower portion 38B. At each lower end of the side portions 58A and 58B, the pipe material constituting the upper frame 58 holds a circular cross section (see FIG. 3), and the lower end of each of the side portions 58A and 58B has a diameter of the above circular cross section. Through holes 66 and 68 penetrating in the direction (sheet width direction) are formed. These through-holes 66 and 68 are opposed to through-holes 70 and 72 formed in the hinge brackets 50 and 52, and hinge bolts 74 and 76 (connection shafts) passing through these through-holes 70 and 72 are hinges. The weld nuts 78 and 80 welded to the brackets 50 and 52 are screwed together. These hinge bolts 74 and 76 are stepped bolts, and stepped portions provided on the front end side come into contact with the hinge brackets 50 and 52, and male screw portions formed on the front end side with respect to the stepped portions are weld nuts 78. , 80. As a result, the side portions 58A and 58B are fastened to the hinge brackets 50 and 52 in a state in which a slight clearance allowing relative rotation with respect to the hinge brackets 50 and 52 is secured, and the back frame upper portion 38A is connected to the back frame lower portion 38B. It is connected to. The hinge bolts 74 and 76 are coaxially arranged on an axis along the seat width direction, and the back frame upper part 38A is around the hinge bolts 74 and 76 with respect to the back frame lower part 38B (the axis line along the seat width direction). Rotation).

  Further, an upper bracket 82 made of a sheet metal material is welded to the side portion 58B on the right side of the seat. The upper bracket 82 is disposed on the outer side in the seat width direction with respect to the side portion 58 </ b> B, and is formed long along the vertical direction of the seat back 16. A through hole 84 is formed in the lower end portion of the upper bracket 82, and the hinge bolt 76 described above passes through the through hole 84. A link connecting piece 82 </ b> A extends from the lower side of the upper bracket 82 toward the front side of the seatback 16.

  On the outer side in the sheet width direction with respect to the link connecting piece 82A, one end portion (upper end portion) in the longitudinal direction of the link pipe 86 (link member) formed of a metal pipe material having a circular cross section is superimposed. The upper end portion of the link pipe 86 is disposed obliquely above the seat front side with respect to the hinge bolt 76. Moreover, the upper end part of this link pipe 86 is crushed flat, and the through-hole 88 is formed in the said flat part. The through hole 88 is opposed to the through hole 90 formed in the link connecting piece 82A, and a link bolt 92 (stepped bolt) penetrating the through hole 88, 90 is welded to the link connecting piece 82A. The weld nut 91 is screwed. Thereby, the upper end part of the link pipe 86 is rotatably connected to the upper bracket 82. The link bolt 92 is disposed with the axial direction along the seat width direction, and the link pipe 86 is rotatable around the link bolt 92 (around the axis along the seat width direction) with respect to the upper bracket 82. ing.

  The lower end portion of the link pipe 86 is disposed obliquely above the seat front side with respect to the connecting shaft 56 of the reclining mechanism 14, and is overlapped on the outer side in the seat width direction with respect to the upper end portion of the link bracket 36 described above. Yes. The lower end portion of the link pipe 86 is flattened, and a through hole 94 is formed in the flat portion. The through hole 94 is opposed to a through hole 96 formed in the link bracket 36, and a weld nut in which a link bolt 98 (stepped bolt) penetrating the through hole 94, 96 is welded to the link bracket 36. 99. Thereby, the lower end part of the link pipe 86 is rotatably connected to the link bracket 36. The link bolt 98 is arranged with the axial direction along the seat width direction, and the link pipe 86 is rotatable around the link bolt 98 (around the axis along the seat width direction) with respect to the link bracket 36. ing.

  Next, the operation and effect of this embodiment will be described.

  In the vehicle seat 10 having the above-described configuration, the thoracic cage and lumbar spine of the seated person are independently supported by the seat back upper part 16A and the seat back lower part 16B. Here, the back frame lower portion 38B constituting the skeleton of the seat back lower portion 16B is connected to the seat cushion frame 20 so as to be reclining, and the skeleton of the seat back upper portion 16A is connected to the upper end portion of the back frame lower portion 38B. The lower end portion of the back frame upper portion 38 </ b> A to be configured is rotatably connected via hinge bolts 74 and 76. The back frame upper part 38A is connected to the link bracket 36 on the seat back frame 38 side via an upper bracket 82, a link pipe 86, and the like.

  Therefore, from the state shown in FIG. 4A, when the back frame lower portion 38B tilts backward with respect to the seat cushion frame 20 as shown by the arrow S in FIG. 4B, the arrow in FIG. As indicated by T, the back frame upper portion 38 </ b> A is pulled by the link pipe 86. As a result, as shown by the arrow U in FIG.

  Accordingly, the relationship between the back tilt angle X of the backrest surface of the seat back lower portion 16B and the tilt angle Y of the backrest surface of the seat back upper portion 16A with respect to the backrest surface of the seat back lower portion 16B is theoretically the fatigue reduction posture. Therefore, the fatigue of the seated person can be reduced. That is, by suppressing the backward tilt of the upper body of the seated person, the burden on the muscle of the seated person is minimized and the internal stress of the intervertebral disc is minimized. Further, the load from the seated person loaded on the vehicle seat 10 is optimally distributed to the seat cushion 12 and the seat back 16. In addition, the backward tilt of the head of the seated person is suppressed, so that the field of view of the seated person is ensured. From the above, the fatigue of the seated person is reduced.

  Moreover, in the vehicle seat 10, the upper frame 58, which is the frame body of the back frame upper portion 38A, is formed of a pipe material, and the lower end portions of the pipe material are hinge brackets 50 and 52 (the upper end of the back frame lower portion 38B). Part) via hinge bolts 74 and 76 so as to be rotatable. Thus, since the pipe material constituting the frame main body of the back frame upper part 38A is directly connected to the back frame lower part 38B by the hinge bolts 74 and 76, the rigidity of the seat back frame 38 is lowered at the connection part. Can be avoided. Accordingly, the rearward tilt of the back frame upper portion 38A at the time of the rear collision of the vehicle is suppressed, so that the head of the seated person can be quickly supported by the headrest 18 connected to the upper end portion of the back frame upper portion 38A. Therefore, it is possible to prevent or reduce the lashing injury of the neck of the seated person.

  Further, in this vehicle seat 10, the lower end portion of the pipe material constituting the frame main body (upper frame 58) of the back frame upper portion 38A is formed in a circular cross section, and the hinge bolt that penetrates the circular cross section in the radial direction. The back frame upper part 38 </ b> A and the back frame lower part 38 </ b> B are connected by 74 and 76. Thus, the lower end of the upper frame 58 (pipe material), that is, the cross-section of the connecting portion to the back frame lower portion 38B is not flattened and is maintained in a circular cross section, thereby reducing the rigidity of the pipe material. Can be prevented. As a result, it is possible to better suppress the reduction in the rigidity of the seat back frame 38 at the connecting portion between the back frame upper part 38A and the back frame lower part 38B.

  Further, in the vehicle seat 10, only one side portion 58B of the pair of left and right side portions 58A and 58B constituting the back frame upper portion 38A is connected to the seat cushion frame 20 side via the link pipe 86 and the like. It is a cantilever structure. Thereby, while being able to reduce a number of parts, the cost reduction of the vehicle seat 10 can be achieved. In addition, since the upper ends of the pair of left and right side frame bodies 44 and 46 constituting the back frame lower portion 38B are connected by the reinforcing pipe 54, it is possible to avoid the rigidity of the seat back frame 38 from being lowered by the cantilever structure. .

  Further, in the vehicle seat 10, it is possible to manufacture a folding seat back frame 38 by using a standard seat back frame 100 (standard skeleton) as shown in FIG. 5. That is, while cutting the upper end side of the side frame main bodies 44 and 46 and a part of the frame 34 in the seat back frame 100, the link bracket 36, the hinge brackets 50 and 52, the reinforcing pipe 54, the upper bracket 82, the link pipe 86, and the like. By adding the above, the seat back frame 38 can be manufactured. As described above, the folding seat back frame 38 can be manufactured by remodeling the standard skeleton instead of the exclusive design from scratch, and thus the manufacturing cost of the vehicle seat 10 can be reduced.

(Supplement of embodiment)
In addition, in the said embodiment, although it was set as the structure made into the cantilever structure with which one side part 58B was connected to the seat cushion frame 20 side via the link pipe 86 grade | etc., It concerns on Claim 1 and Claim 2. The invention is not limited to this, and both side portions 58A and 58B may be a both-end support structure in which the seat cushion frame 20 side is connected via a link pipe 86 or the like. That is, by adding the upper bracket 82, the link pipe 86, the link bracket 36, the link bolts 92, 98, etc. to the left side of the vehicle seat 10, a double-supported structure can be obtained. In this case, when a load from the seated person to the rear side is applied to the seat back 16, a part of the load is borne by the pair of left and right link pipes 86 and the like so that the back frame upper portion 38A is left and right. It can be supported with good balance on both sides.

  Moreover, in the said embodiment, it was set as the structure by which the hinge brackets 50 and 52 were fixed to each upper end part of the side frame main bodies 44 and 46, However, The invention which concerns on Claims 1-4 is not restricted to this, A side frame The main bodies 44 and 46 and the hinge brackets 50 and 52 may be integrally formed.

  In the above embodiment, the hinge brackets 50 and 52 are connected by the reinforcing pipe 54 (reinforcing frame). However, the inventions according to claims 1 and 2 are not limited thereto, and the reinforcing frame is omitted. A configuration may be used.

  Furthermore, in the said embodiment, although the link bracket 36 was fixed to the flame | frame 34 of the reclining mechanism 14, the invention which concerns on Claims 1-4 is not restricted to this, The flame | frame 34 and the link bracket 36 are integrated. You may make it the structure formed in.

  In the above embodiment, the left and right lower ends of the upper frame 58, which is the frame main body of the back frame upper portion 38A, are formed in a circular cross section, and the hinge bolts 74 and 76 (connection shafts) penetrate the radial cross section in the radial direction. However, the invention according to claim 1 is not limited to this, and the left and right lower end portions of the upper frame 58 are flattened into a flat shape, and the hinge bolts 74 and 76 penetrate the flat portion. Good.

  In addition, the present invention can be implemented with various modifications without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 20 Seat cushion frame 38 Seat back frame 38A Back frame upper part 38B Back frame lower part 51, 53 Side frame 54 Reinforcement pipe (reinforcement frame)
58 Upper frame (frame body)
58A, 58B Side part 76 Hinge bolt (connection shaft)
82 Upper bracket 86 Link pipe (link member)

Claims (4)

The lower portion of the back frame is connected to the seat cushion frame so as to be reclining, and the upper portion of the back frame having the headrest connected to the upper end portion is connected to the seat cushion frame side via a connecting means, In conjunction with the rearward tilt of the lower part of the frame, the upper part of the back frame comprises a folding seat back frame that tilts forward with respect to the lower part of the back frame,
In the upper part of the back frame, the frame body is formed of a pipe material, and the lower ends of the pair of left and right side parts constituted by the pipe material penetrate the pipe material with respect to the upper end part of the lower part of the back frame , respectively. A vehicle seat characterized in that it is rotatably connected through a connecting shaft. 2. The vehicle seat according to claim 1, wherein lower end portions of the pair of side portions are formed in a circular cross section, and the connecting shaft penetrates the circular cross section in a radial direction. The lower portion of the back frame has a pair of left and right side frames, and a reinforcing frame connecting the upper ends of the pair of side frames,
Said frame body of said back frame top is connected respectively via the connecting shaft each lower end portion of the pair of side portions with respect to each upper end of the pair of side frames,
The connecting means includes
An upper bracket fixed to one of the pair of side portions;
A link member having an upper end portion rotatably connected to the upper bracket and a lower end portion rotatably connected to the seat cushion frame side;
The vehicle seat according to claim 1, further comprising: The lower portion of the back frame has a pair of left and right side frames,
Said frame body of said back frame top is connected respectively via the connecting shaft each lower end portion of the pair of side portions with respect to each upper end of the pair of side frames,
The connecting means includes
A pair of left and right upper brackets fixed to each of the pair of side portions;
A pair of left and right link members, each upper end being rotatably connected to each of the pair of upper brackets, and each lower end being rotatably connected to the seat cushion frame;
The vehicle seat according to claim 1, further comprising:

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