JP2013189141A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for a vehicle by which centrifugal force applied to an occupant upon turning of a car can favorably be received by a pressure-taking member.SOLUTION: A seat for a vehicle includes a pressure-taking member 40 arranged between right and left side frames 20 and behind an occupant, and swing mechanisms 50 arranged on both right and left sides of the pressure-taking member 40 to swing a left side part or a right side part of the pressure-taking member 40 back and forth. The swing mechanisms 50 respectively include: first link members 53 arranged rotatably with respect to the side frames 20; second link members 54 arranged rotatably with respect to the first link members 53 and rotatably connected to the pressure-taking member 40; and a driving source to rotate the first link members 53 and the second link members 54.

Description

  The present invention relates to a vehicle seat including a seat cushion and a seat back.

  2. Description of the Related Art Conventionally, as a vehicle seat, in order to favorably support a centrifugal force applied to an occupant by turning of a vehicle with a seat back, a seat back configured to be swingable back and forth is known (Patent Document). 1). Specifically, this structure includes a pair of left and right side frames and a pressure receiving member that is disposed between the side frames and supports a part of the seat back from the rear side. Is pivotally supported by one link member that is pivotally supported by the first link member.

  The left and right link members and a pedal that is stepped on by the driver are connected by wires, so that the seat back of the seat back can be connected via the wires, the link member, and the pressure receiving member according to the driver's pedal operation. Part of it swings.

Patent No. 4569293

  However, in the prior art, since only one link member is provided on each of the left and right, the amount of rocking of the pressure receiving member is small, so that the centrifugal force applied to the occupant during turning of the vehicle cannot be received well by the pressure receiving member. There was a fear.

  Then, an object of this invention is to provide the vehicle seat which can receive suitably the centrifugal force added to a passenger | crew at the time of vehicle turning with a pressure receiving member.

  The present invention that solves the above-described problems is a vehicle seat that includes a seat cushion and a seat back, and includes left and right side frames that constitute the left and right frames of the seat back, and includes an occupant between the left and right side frames. A pressure receiving member disposed at the rear of the pressure receiving member, and a rocking mechanism that is disposed on both the left and right sides of the pressure receiving member and rocks the left side or the right side of the pressure receiving member in the front-rear direction. A first link member provided to be rotatable with respect to the side frame, a second link member provided to be rotatable with respect to the first link member, and rotatably connected to the pressure receiving member; And a drive source for rotating the first link member and the second link member.

  According to this configuration, the first link member and the second link member (at least two link members on the left and right) can increase the amount of stroke in the front-rear direction of the left side or right side of the pressure receiving member. The centrifugal force applied to the occupant during turning of the vehicle can be favorably received by the pressure receiving member.

  In the above-described configuration, it is preferable that the pressure receiving member is configured to be elastically deformable.

  According to this, since the pressure receiving member can be fitted to the occupant by elastic deformation, the centrifugal force applied to the occupant can be better received by the pressure receiving member.

  In the above-described configuration, the pressure receiving member includes a pressure receiving plate that supports the back of the occupant and a connecting wire disposed on the rear side of the pressure receiving plate, and the second link member is connected to the connecting wire. It is desirable to be connected.

  According to this, since the occupant's back is supported by the pressure receiving plate, it is possible to suppress the occupant from feeling uncomfortable on the back, for example, as compared to a conventional structure in which the pressure receiving member is formed in a rectangular bar shape. Moreover, since the 2nd link member is connected with the connection wire, the structure of a connection part can be simplified compared with the structure which connects a 2nd link member to a pressure receiving plate, for example.

  In the above-described configuration, it is desirable that the distal end of the connecting wire is rotatably engaged with a hole formed in an end portion of the second link member.

  According to this, the structure can be simplified compared to a structure in which, for example, the distal end of the connecting wire is bent in a ring shape and the distal end is hooked on a hook-shaped portion formed on the second link member.

  In the above-described configuration, it is preferable that a biasing member that biases the second link member to an initial position is provided between the first link member and the second link member.

  According to this, the second link member can be returned to the initial position by the urging force of the urging member.

  Further, in the above-described configuration, the biasing member is a torsion spring having a coil portion, and the coil portion is disposed so as to surround the rotation shaft on the first link member side of the second link member. Is desirable.

  According to this, since the coil part of the torsion spring is arranged so as to surround the rotation axis of the second link member, for example, the coil part of the torsion spring is arranged so as not to surround the rotation axis of the second link member. Compared with the structure, the swing mechanism can be made compact.

  According to the present invention, the centrifugal force applied to the occupant during turning of the vehicle can be favorably received by the pressure receiving member.

  In addition, according to the present invention, by making the pressure receiving member elastically deformable, the centrifugal force applied to the occupant can be received better by the pressure receiving member.

  In addition, according to the present invention, the pressure receiving member is constituted by the pressure receiving plate and the connecting wire, and the second link member is connected to the connecting wire, so that it is possible to suppress the uncomfortable feeling of the occupant and simplify the structure of the connecting portion. Can be

  Moreover, according to this invention, a structure can be simplified by engaging the front-end | tip of a connection wire with the hole of a 2nd link member.

  Further, according to the present invention, the second link member can be returned to the initial position by the urging member.

  Further, according to the present invention, the swing mechanism can be made compact by disposing the coil portion of the torsion spring so as to surround the rotation shaft of the second link member.

1 is a perspective view of a vehicle seat as a vehicle seat according to an embodiment. It is a perspective view of a seat frame built in a vehicle seat. It is a front view of the seat back frame which comprises a seat frame. It is an expansion perspective view which shows a rocking | fluctuation mechanism. It is a disassembled perspective view which decomposes | disassembles and shows a rocking | fluctuation mechanism. It is a top view which shows operation | movement of a rocking | fluctuation mechanism. It is explanatory drawing (a)-(c) which shows the motion of the rocking | fluctuation mechanism and pressure receiving member when a vehicle turns right. It is sectional drawing which shows the state which the 2nd link member is contacting the site | part between two 1st beads. It is sectional drawing which shows the form which a 2nd link member contacts a 1st bead. It is an enlarged view which shows the form in which a 1st bead is formed horizontally.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, first, the overall configuration of a vehicle seat as an example of a vehicle seat will be briefly described, and then the characteristic part of the present invention will be described in detail.

  As shown in FIG. 1, the vehicle seat S is a seat used for a driver's seat of an automobile, and mainly includes a seat cushion S1, a seat back S2, and a headrest S3.

  A seat frame F as shown in FIG. 2 is built in the seat cushion S1 and the seat back S2. The seat frame F is mainly composed of a seat cushion frame F1 constituting a frame of the seat cushion S1 and a seat back frame F2 constituting a frame of the seat back S2. The seat cushion S1 is configured by covering a seat cushion frame F1 with a seat cushion pad made of a cushion material such as urethane foam and a skin material made of synthetic leather or fabric, and the seat back S2 is placed on the seat back frame F2. It is configured by covering a seat back pad made of a cushion material and a skin material made of synthetic leather or fabric.

The seat cushion frame F1 is installed on the floor of the automobile via the slide rail SL. Thereby, the vehicle seat S can adjust the front-rear position. The lower portion of the seat back frame F2 is rotatably connected to the rear portion of the seat cushion frame F1 via a reclining mechanism RL. As a result, the seat back S2 can tilt forward and backward with respect to the seat cushion S1.
In this specification, front and rear, left and right, and top and bottom are based on an occupant seated on the vehicle seat S in a state where the seat back S2 is not tilted by the reclining mechanism RL.

  The seat back frame F2 mainly includes an upper frame 10, left and right side frames 20, and a lower frame 30, and the upper frame 10, the left and right side frames 20, and the lower frame 30 are integrally formed by welding or the like. It is formed in a combined frame shape. A pressure receiving member 40 and a pair of left and right swing mechanisms 50, which will be described in detail later, are disposed inside the frame-shaped seat back frame F2. In FIG. 2 and FIG. 3 and the like, the swing mechanism 50 is illustrated in a simplified manner as appropriate.

  The upper frame 10 is made of a pipe material bent in a substantially U shape, and a pair of left and right support brackets 12 for attaching the headrest S3 are fixed to the front side of the horizontal pipe portion 11 extending in the left-right direction by welding. Yes. Further, the left and right vertical pipe portions 13 extending in the vertical direction of the upper frame 10 constitute a left and right side frame 20 integrally with the left and right side frame main body portions 21 coupled to the lower portion thereof.

  The left and right side frame main body portions 21 are formed in a substantially U shape in sectional view by pressing a metal plate or the like, and are arranged to face in the left-right direction. The side frame main body portion 21 is coupled to the vertical pipe portion 13 while holding the vertical pipe portion 13 at the upper portion thereof, and has a protruding portion 22 whose lower portion projects forward from the upper portion. Is formed.

Hereinafter, the pressure receiving member 40 and the swing mechanism 50 will be described in detail.
The pressure receiving member 40 is an elastically deformable plate-shaped member made of resin or the like, and is disposed behind the occupant between the left and right side frames 20. Specifically, as shown in FIG. 3, the pressure receiving member 40 includes a pressure receiving portion 40A as an example of a pressure receiving plate that supports the occupant's back via the cushion material and the like described above, and the upper body side portion of the occupant as a cushion material and the like. And the upper connecting wire W1 and the lower connecting wire W2 that support the pressure receiving portion 40A from the rear side.

  The pressure receiving portion 40A is formed with a relatively large area (an area that covers at least 1/3 or more of the internal space of the frame-like seat back frame F2) in order to support the occupant's back on a wide surface, and the seat back S2 It is arrange | positioned in the position corresponding to the center part. And in the pressure receiving part 40A, 2nd bead B2 which protrudes back is formed.

  Specifically, the second bead B2 is formed in a concave shape that is recessed from the front, and mainly includes a plurality of upper and lower bead portions B21 extending in the vertical direction and a plurality of upper and lower bead portions B21 extending in the left-right direction. And a connecting bead portion B22 for connecting the two. By providing the second bead B2 in the pressure receiving portion 40A in this way, it is possible to increase the rigidity of the pressure receiving portion 40A.

  The support part 41 extends from the upper part of the left and right ends of the pressure receiving part 40A, more specifically, from the left and right sides of the part corresponding to the height of the chest of the occupant of the pressure receiving part 40A, toward the diagonally forward outside in the left-right direction. Thus, it is formed integrally with the pressure receiving portion 40A (see FIG. 2). In other words, the support portion 41 is disposed at a position corresponding to the left and right side portions projecting forward from the left and right sides of the central portion of the seat back S2.

  The support portion 41 is formed with a first bead B1 protruding rearward. Thereby, the rigidity of the support part 41 can be increased.

  Specifically, a plurality of first beads B1 are formed at intervals in the vertical direction, and extend from the outer end in the left-right direction of the support portion 41 toward the second bead B2. And the outermost upper and lower bead portions B21) in the left-right direction. Thereby, the rigidity of the boundary part 42 (polygonal line part) of the pressure receiving part 40A and the support part 41 can be increased, and the support part 41 can be prevented from being deformed with respect to the pressure receiving part 40A.

  Further, the first bead B1 is formed obliquely with respect to the horizontal plane. Specifically, the first bead B1 is formed to incline upward from the second bead B2 toward the outside in the left-right direction. Thereby, for example, compared with a structure in which the first bead is formed in a cross shape, it is possible to efficiently receive loads applied from various directions to the support portion 41 from the occupant with a simple structure.

  The upper connecting wire W1 and the lower connecting wire W2 are arranged on the rear side of the pressure receiving portion 40A, and are engaged with an engagement portion (not shown) formed on the pressure receiving portion 40A or the support portion 41, thereby receiving the pressure receiving portion 40A. And the support part 41 is supported so that back movement is possible. Specifically, the upper connecting wire W1 has left and right ends connected to a swing mechanism 50, which will be described later, and the lower connecting wire W2 swings rearward with the left and right ends fixed to the inner surface of the side frame body 21. It is connected to a movable wire support arm 23.

  As a result, for example, when a rear impact load is applied from the rear of the vehicle, a leftward and rightward end of the upper connecting wire W1 is applied when a backward load (reverse movement load) is applied to the pressure receiving portion 40A and the support portion 41. When the bent portion of the lower connecting wire W2 is bent by the bending of the wire support arm 23 or the left and right ends of the lower connecting wire W2 are moved rearward, the pressure receiving portion 40A and the support portion 41 are moved rearward. It is possible to absorb the load applied to. The wire support arm 23 is configured to swing backward by a known mechanism using a tension coil spring (not shown) when a backward movement load of a predetermined value or more is applied.

  The swing mechanism 50 is disposed on both the left and right sides of the pressure receiving member 40, and is configured to swing the left side or right side of the pressure receiving member 40 in the front-rear direction. Specifically, the swing mechanism 50 is controlled by a control device (not shown) so as to swing the pressure receiving member 40 in the same direction as the turning direction of the vehicle. The centrifugal force) can be received by the pressure receiving member 40.

  Various methods can be adopted as a control method by the control device. As an example, for example, the lateral acceleration and the turning direction are calculated based on signals from the wheel speed sensor and the steering angle sensor, and when the lateral acceleration exceeds a predetermined threshold, the swinging of the outside in the turning direction is performed. There is a method in which the mechanism 50 is operated and the swing mechanism 50 pushes the outer portion of the pressure receiving member 40 in the turning direction forward.

  As shown in FIGS. 4 and 5, the swing mechanism 50 mainly includes an actuator 51, a holding bracket 52, a first link member 53, a second link member 54, and a torsion as an example of a biasing member. A spring 55 is provided.

  The actuator 51 is a drive source for rotating the first link member 53 and the second link member 54. The actuator 51 includes a stepping motor 51A, a gear box 51B, and an output shaft 51C, and the output shaft 51C extends in the vertical direction. It is arranged along. The driving force from the stepping motor 51A is decelerated by the gear box 51B and transmitted to the output shaft 51C, so that the output shaft 51C rotates at a predetermined angle.

  The holding bracket 52 is a substantially semicircular plate-like member, and is fixed to the vertical pipe portion 13 (side frame 20) by welding or the like via an attachment surface 52A formed in an arc shape. In addition, the holding bracket 52 is formed with a through hole 52B for allowing the output shaft 51C of the actuator 51 to pass therethrough. An upper end surface 51D of the actuator 51 is fixed to the lower surface of the holding bracket 52 by screws or the like (not shown).

  The first link member 53 is a plate-like member formed in a long shape, and one end thereof is fixed to the output shaft 51C of the actuator 51, so that the other end is centered on the output shaft 51C in the front-rear direction. It can swing (see FIG. 6). That is, the first link member 53 is rotatable with respect to the side frame 20.

  Specifically, a cross-sectional view D-type engagement hole 53A that engages with a cross-sectional view D-type tip of the output shaft 51C is formed at one end of the first link member 53, and the other end side has a first An insertion hole 53 </ b> B into which a stepped bolt 56 and a collar 57 that become the swing center of the two link member 54 are inserted is formed. Further, two rectangular plate-like regulating walls 58 that define the swing range of the second link member 54 are fixed to one end side and the other end side of the insertion hole 53B in the first link member 53, respectively. One rectangular fitting hole 53C is formed.

  Accordingly, it is possible to restrict the second link member 54 from swinging with respect to the first link member 53 with the two restriction walls 58. Further, a fixing hole 53D for fixing one end portion 55A of the torsion spring 55 is formed between the engagement hole 53A and the insertion hole 53B in the first link member 53.

  The second link member 54 is rotatably provided on the first link member 53 by the stepped bolt 56, the collar 57, and the nut 59 described above. Specifically, an insertion hole 54 </ b> A through which the shaft portion 56 </ b> A of the stepped bolt 56 is inserted is formed at one end portion of the second link member 54. On the other hand, the stepped bolt 56 has a shaft portion 56A and a medium diameter portion 56C that has a larger diameter than the shaft portion 56A and a smaller diameter than the head portion 56B.

  The collar 57 is rotatably supported in the insertion hole 53B of the first link member 53, and the cylindrical portion 57A through which the shaft portion 56A of the stepped bolt 56 is inserted, and radially outward from the upper end of the cylindrical portion 57A. And an extending flange portion 57B. The cylindrical portion 57 </ b> A is formed so as to slightly protrude from the lower surface of the first link member 53 in a state where the flange portion 57 </ b> B is in contact with the upper surface of the first link member 53.

  The flange portion 57 </ b> B functions as a retaining member that sandwiches and supports the second link member 54 between the intermediate diameter portion 56 </ b> C of the stepped bolt 56 and suppresses the collar 57 from falling downward from the first link member 53. ing. The nut 59 is fastened to the lower end of the collar 57 by being screwed into the shaft portion 56A (screw portion) of the stepped bolt 56 protruding downward from the lower end of the cylindrical portion 57A of the collar 57. . The nut 59 functions as a retaining member that prevents the collar 57 from being pulled upward from the first link member 53 in a state where the nut 59 is fastened to the collar 57.

  That is, the second link member 54 can swing integrally with the first link member 53 together with the stepped bolt 56, the collar 57 and the nut 59. Further, as shown in FIG. 6, the tip of the upper connecting wire W1 can be rotated at the other end of the second link member 54 (the end opposite to the insertion hole 54A: hereinafter, the tip). A connection hole 54B is formed to engage with.

  As a result, when the first link member 53 swings forward from the rear initial position (solid line position), the upper end of the second link member 54 is restricted from moving outward in the left-right direction by the upper connecting wire W1. Thus, the second link member 54 swings in a direction away (opening) from the first link member 53. When the first link member 53 swings from the front position (the position indicated by the two-dot chain line) to the initial position, the second link member 54 approaches (closes) the first link member 53 by a torsion spring 55 described later. ) Swings in the) direction.

  As shown in FIG. 5, a fixing hole 54 </ b> C for fixing the other end 55 </ b> B of the torsion spring 55 is formed between the insertion hole 54 </ b> A and the connection hole 54 </ b> B in the second link member 54. .

  The torsion spring 55 is disposed between the first link member 53 and the second link member 54 (mechanistically), and generates a biasing force that pulls the first link member 53 and the second link member 54 together. Is configured to do. That is, the torsion spring 55 is configured to bias the second link member 54 to the initial position (position indicated by a solid line in FIG. 6) with respect to the first link member 53. Thereby, the second link member 54 can be returned to the initial position by the urging force of the torsion spring 55.

  Specifically, the torsion spring 55 includes a coil portion 55C, an L-shaped first arm portion 55D extending radially outward from the lower end of the coil portion 55C, and extending radially outward from the upper end of the coil portion 55C. And an L-shaped second arm portion 55E extending downward.

  The coil portion 55 </ b> C of the torsion spring 55 is disposed so as to surround the medium diameter portion 56 </ b> C (the rotation shaft of the second link member 54 on the first link member 53 side). Thus, for example, the swing mechanism 50 can be made more compact than a structure in which the coil portion of the torsion spring is disposed so as not to surround the rotation shaft of the second link member.

  In the swing mechanism 50 configured as described above, as shown in FIGS. 7A to 7C, for example, when the vehicle is turned in the right direction (clockwise in the drawing), the left swing mechanism 50 is used. Oscillates forward, the pressure receiving member 40 oscillates clockwise in the figure. At this time, since the second link member 54 is provided between the tip of the first link member 53 and the upper connecting wire W1, for example, the first link member is used as the upper connecting wire without providing the second link member. Compared to the structure of direct connection, the amount of stroke to the front of the left end of the upper connection wire W1 becomes large. Thereby, since the pressure receiving member 40 swings greatly, the centrifugal force applied to the occupant when the vehicle turns can be favorably received by the pressure receiving member 40.

  Further, the second link member 54 always contacts the support portion 41 of the pressure receiving member 40 from the initial position shown in FIG. 7A until the second link member 54 swings to the foremost position shown in FIG. 7C. It is supposed to be. Thereby, for example, the load applied from the occupant to the support portion 41 can be favorably received by the second link member 54 as compared with a structure in which the load applied from the occupant to the support portion is supported by the upper connecting wire.

  In particular, in the present embodiment, as shown in FIG. 8, the second link member 54 is in contact with a portion between the two first beads B <b> 1 in the support portion 41. Thereby, it can suppress by the two 1st bead B1 that the 2nd link member 54 shifts up and down (the arrangement direction of two 1st bead B1).

According to the above, in addition to the effects described above, the following effects can be achieved.
Since the second link member 54 is connected to the upper connecting wire W1, for example, the structure of the connecting portion can be simplified compared to a structure in which the second link member is connected to the pressure receiving plate.

  Since the upper connecting wire W1 and the second link member 54 are connected by engaging the tip of the upper connecting wire W1 with a connecting hole 54B formed at the tip of the second link member 54, for example, the tip of the upper connecting wire is The structure can be simplified as compared with a structure that is bent in a ring shape and the tip is hooked on a hook-shaped portion formed on the second link member.

  Since the pressure receiving member 40 is configured to be elastically deformable, the pressure receiving member 40 can be fitted to the occupant by elastic deformation, and the centrifugal force applied to the occupant can be received more favorably by the pressure receiving member 40.

  Since the occupant's back is supported by the wide surface of the pressure receiving portion 40A, it is possible to prevent the occupant from feeling uncomfortable on the back as compared to, for example, a conventional structure in which the pressure receiving member is formed in a rectangular bar shape.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below. In the following description, components that are substantially the same as those in the above-described embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the said embodiment, although the 2nd link member 54 was made to contact the site | part between two 1st bead B1 among the support parts 41, this invention is not limited to this, As shown in FIG. The link member 54 may be brought into contact with the first bead B1. According to this, since the 1st bead B1 which is a highly rigid part is supported by the 2nd link member 54, a passenger | crew's load can be favorably received by the 2nd link member 54. FIG.

  In the said embodiment, although 1st bead B1 was formed diagonally with respect to the horizontal surface, this invention is not limited to this, As shown in FIG. 10, 1st bead B1 is formed along the direction parallel to a horizontal surface. May be. In this case, it is desirable to arrange the swing mechanism 50 so that the output shaft 51C of the actuator 51 is along the vertical direction, as in the above embodiment.

  That is, it is desirable that the second link member 54 is configured to be rotatable in a horizontal plane. According to this, as shown in the figure, for example, when the second link member 54 is in contact with the first bead B1, it is possible to prevent the rotating second link member 54 from being detached from the first bead B1. Therefore, the first bead B1 can be reliably supported by the second link member 54. For example, when the 2nd link member contacts the part between a plurality of 1st beads, it can control more that the 2nd link member removes from between the 1st beads.

  In the embodiment, the second link member 54 is always brought into contact with the support portion 41 of the pressure receiving member 40 until the second link member 54 swings from the initial position to the foremost position. However, the present invention is not limited to this. The second link member 54 only needs to be configured to come into contact with the support portion 41 at least at the position where the pressure receiving member 40 swings forward most. Even in this case, since the support portion 41 is supported by the second link member 54 at the position where the pressure receiving member 40 is swung forward most, the second link member 54 applies centrifugal force applied to the occupant when the vehicle turns. Can receive well.

  In the above embodiment, one swing mechanism 50 is configured by the two link members 53 and 54, but the present invention is not limited to this, and the swing mechanism may be configured by three or more link members. In other words, the first link member only needs to be rotatable with respect to the side frame, so that one or more other link members may be provided between the first link member and the side frame (holding bracket). Good. Moreover, since the 2nd link member should just be rotatable with respect to a 1st link member, even if it provides one or more other link members between a 1st link member and a 2nd link member. Good.

  In the above-described embodiment, the torsion spring 55 is exemplified as the urging member. However, the present invention is not limited to this, and may be, for example, a leaf spring or a wire spring.

  The specific configuration of the seat frame F (the seat cushion frame F1 and the seat back frame F2) shown in the embodiment is an example, and the present invention is not limited to the configuration of the embodiment. For example, in the above-described embodiment, the left and right side frames 20 of the seat back frame F2 are configured by the pipe-shaped vertical pipe portion 13 and the plate-shaped side frame main body portion 21, but are not limited thereto. The side frame may be composed of only a pipe-shaped frame or may be composed of only a plate-shaped frame.

  In the said embodiment, although the vehicle seat S used by a motor vehicle was illustrated as a vehicle seat, this invention is not limited to this, For example, the sheet | seat used for a ship, an aircraft, etc. It can also be applied to.

20 side frame 40 pressure receiving member 50 swing mechanism 51 actuator 51A stepping motor 51B gear box 53 first link member 54 second link member S vehicle seat S1 seat cushion S2 seat back

Claims (6)

A vehicle seat comprising a seat cushion and a seat back, and having left and right side frames constituting left and right frames of the seat back,
A pressure receiving member disposed behind the occupant between the left and right side frames;
A swing mechanism that is disposed on both left and right sides of the pressure receiving member and swings the left side or right side of the pressure receiving member in the front-rear direction;
The swing mechanism is
A first link member provided to be rotatable with respect to the side frame;
A second link member rotatably provided to the first link member and rotatably connected to the pressure receiving member;
A vehicle seat comprising: a drive source for rotating the first link member and the second link member.   The vehicle seat according to claim 1, wherein the pressure receiving member is configured to be elastically deformable. The pressure receiving member is composed of a pressure receiving plate that supports the back of the occupant, and a connecting wire disposed on the rear side of the pressure receiving plate,
The vehicle seat according to claim 2, wherein the second link member is connected to the connection wire.   The vehicle seat according to claim 3, wherein a distal end of the connecting wire is rotatably engaged with a hole formed in an end portion of the second link member.   The urging member that urges the second link member to an initial position is provided between the first link member and the second link member. The vehicle seat according to any one of claims.   The urging member is a torsion spring having a coil portion, and the coil portion is disposed so as to surround a rotation shaft of the second link member on the first link member side. 5. The vehicle seat according to 5.

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