JP6874233B2 - Vehicle seats - Google Patents

Description

The present invention relates to a seat that reclines from a state in which a backrest is raised, which is installed in various vehicles such as a free-running vehicle such as a bus, a track-traveling vehicle such as a railroad vehicle, a ship, and an aircraft.

Various vehicle seats have been developed that have a reclining function for the backrest and a tilting function for the seat. If only reclining the backrest is used, the opening angle between the seat and the backrest will increase by the amount of reclining, but if the seat tilts backward at the same time, the increase in the opening angle will be alleviated by the amount of tilt. The change in sitting comfort is reduced, the body is less likely to shift forward, and the degree of fatigue is reduced.

In addition, various vehicle seats having a reclining function of the backrest and a front / rear sliding function of the seat and the backrest have also been developed. If only reclining the backrest is used, the distance between the upper part of the backrest and the rear seats will decrease during reclining, but if the seat and backrest move forward at the same time, the decrease in the distance between the rear seats will be alleviated. It is possible to reduce the feeling of oppression that the seated person receives. This is especially useful when the reclining angle is large.

Further, Patent Documents 1 to 3 describe a vehicle seat having a reclining function of the backrest, a tilting function of the seat, and a forward function of the seat and the backrest.

Japanese Patent No. 3336454 Japanese Patent No. 5341991 Japanese Patent No. 5337719

However, the following problems still remain in the passenger seats of Patent Documents 1 to 3. That is, when the seated person sits shallowly on the seat, a gap is created between the waist and the lower part of the backrest. Even if this gap does not cause much problem during upright, the seater may feel uncomfortable because the lumbar spine of the seated person floats due to the gap during reclining. In addition, the reclining backrest may pull the garment (upper part of the shirt or dress) of the occupant's upper body upward (obliquely backward), which may also cause the occupant to feel uncomfortable.

Therefore, the first object of the present invention is to support the lumbar spine of the seated person during reclining, and further, the second object of the present invention is to make it difficult for the clothes of the upper body of the seated person to be pulled upward during reclining. ..

In order to solve the first problem, the vehicle seat of the present invention is configured such that when the backrest is reclining, both the lower portion of the backrest frame and the approaching portion of the approaching member come close to each other. It is provided with a frame and an approaching member, and a lumbar support provided between the two parts, which is deformed by receiving a force from both parts during reclining and projects to the front side to support the lumbar spine of the seated person. The "front side" here is the "front side" in the upright state and the "upper side" in the reclining state.

The configuration of the vehicle seat other than the above is not particularly limited, but in that the second problem can be solved, the lower part of the backrest frame and the rear part of the seat frame of the vehicle seat are reclined when the backrest is reclining. It is preferable to have a seat frame configured to approach each other. This is because the approach cancels out the vertical displacement of the backrest, keeps the position of the back of the seated person and the backrest substantially constant, and makes it difficult for the clothes of the upper body of the seated person to be pulled upward.

The mode of the approached member and the approached portion thereof is not particularly limited, but an embodiment in which either the seat frame or the support frame supporting the seat frame is the approached member and the rear portion thereof is the approached portion is exemplified.

The mode of the lumbar support and its modification is not particularly limited, but the following modes will be exemplified.
[A] The lumbar support is a flexible plate-like body, and the deformation is a deformation that bends toward the front side. The material of the plate-like body is not particularly limited, and various resins and various metals are exemplified.
[A] The lumbar support is an airbag, and the deformation is a deformation that becomes larger toward the front side by becoming smaller in the approaching direction.

The deformation start time of the lumbar support is not particularly limited, but the following aspects will be exemplified.
[A] The lumbar support is an embodiment in which the deformation is started at the same time as the start of approaching the two parts by the start of reclining. This aspect is effective when it is desired to start the extension of the lumbar support at the same time as the start of reclining. Specifically, the upper part of the lumbar support is fixed to the lower part of the backrest frame, and the lower part of the lumbar support is fixed to the approached portion.

[B] The lumbar support does not undergo the deformation by receiving a force from both parts from the upright state in which the backrest is upright until the two parts approach each other by a predetermined amount by reclining, and the reclining causes the lumbar support. An embodiment configured to receive a force from both parts to cause the deformation when both parts approach each other by a predetermined amount or more. This aspect is effective when the lumbar support is to be extended only in the latter half of reclining. Specifically, the following aspects will be illustrated.

[B1] The upper part of the lumbar support is fixed to the lower part of the backrest frame, and in the upright state, a space is formed between the lower part of the lumbar support and the approached portion, and both portions are reclined from the upright state. A mode in which the lower portion of the lumbar support comes into contact with the approached portion when the predetermined amount is approached.
[B2] The upper part of the lumbar support is fixed to the lower part of the backrest frame, and the lower part of the lumbar support is slidably attached to the approached portion. A mode configured to prevent sliding.
[B3] The lower part of the lumbar support is fixed to the approached portion, and in the upright state, a gap is formed between the upper part of the lumbar support and the lower part of the backrest frame. A mode in which the lower part of the backrest frame comes into contact with the upper part of the lumbar support when the predetermined amount is approached.
[B4] The lower part of the lumbar support is fixed to the approached portion, and the upper part of the lumbar support is slidably attached to the lower part of the backrest frame. A mode configured to prevent sliding.

The fixing is not particularly limited, and examples thereof include fixing with rivets, screws, adhesives, and the like. Further, the slidable mounting is not particularly limited, but mounting by a long hole and a pin is exemplified.

As a more specific example of the above [B1], the vehicle seat includes a seat frame and a support frame that supports the seat frame, the support frame is an approaching member, the rear portion is an approaching portion, and the lumbar support. Is attached with a flexible fabric, and the lower part of the fabric is detachably attached to the rear part of the seat frame. In this aspect, in the upright state where a gap is formed between the lower part of the lumbar support and the approached portion, the lower part of the lumbar support is supported by the rear part of the seat frame via the fabric. Further, if the fabric is detachable in this way, the seat and the backrest will not be inseparably integrated by the attachment of the cloth, and it will not be difficult to assemble and disassemble the vehicle seat. The specific mode of this detachable attachment is not particularly limited, but attachment by a hook-and-loop fastener, a snap button, or the like is exemplified.

The lumbar support may be in direct contact with the seated person's waist, but a cushion is installed on the front side of the lumbar support in terms of comfort, and the lumbar support is moved to the front side due to the deformation. It is preferable that the cushion is configured to be pushed out to the front side by overhanging. More specifically, the cushion is a back cushion that extends from the front side of the lumbar support to the front side of the upper part of the backrest frame, and the lumbar support is configured to push the lower part of the backrest cushion toward the front side. The above-mentioned embodiment is illustrated. Further, the vehicle seat preferably has a cover that covers the cushion and the lumbar support together. This is because the cushion and lumbar support are united.

According to the vehicle seat of the present invention, the seated person is comfortable in the reclining state because the lumbar spine is supported by the lumbar support in the reclining state in which the backrest is reclining. What's more, the lumbar support automatically projects in conjunction with reclining without any special operation. Further, according to a preferred embodiment of the vehicle seat of the present invention, the lower part of the backrest frame and the rear part of the seat frame come close to each other during reclining, so that the clothes of the upper body of the seated person are less likely to be pulled upward (upward diagonally backward). Therefore, in this respect as well, the seated person can comfortably recline the backrest.

FIG. 1 is a side sectional view showing a vehicle seat of an embodiment. FIG. 2 is an exploded perspective view showing a support frame and a transmission member of the vehicle seat. FIG. 3 is a perspective view showing a frame and the like of the vehicle seat. FIG. 4A is a side sectional view showing the frame and the like, and FIG. 4B is a side sectional view showing a state in which the backrest is reclining from that state. 5 (a) to 5 (c) are side sectional views showing how the lumbar support protrudes to the front side according to the reclining of the backrest of the passenger seat.

The width of the lumbar support is not particularly limited, but is preferably 70% or more of the width of the backrest frame in that the lumbar spine of the seated person can be sufficiently supported even at both ends in the width direction of the passenger seat. Further, the width of the lumbar support is preferably 100% or less of the width of the backrest frame in that both end portions of the lumbar support do not protrude outward in the width direction of the backrest frame.

The mode of approach is not particularly limited, but the following mode will be exemplified.
[A] When the backrest is reclining, the lower part of the backrest frame moves in the direction of approaching the approached portion, and the approached portion does not move.
[A] When the backrest is reclining, the lower part of the backrest frame does not move, but the approached portion moves in the direction of approaching the lower part of the backrest frame.
[C] When the backrest is reclining, the lower part of the backrest frame moves in the direction of approaching the approached portion, and the approached portion moves in the direction of approaching the lower part of the backrest frame.
[D] When the backrest is reclining, the lower part of the backrest frame moves in the direction of approaching the approached portion, and the approached portion moves in the direction of separating from the lower part of the backrest at a slower pace.
[E] When the backrest is reclining, the lower part of the backrest frame moves in the direction away from the approached portion, and the approached portion moves in the direction of approaching the lower part of the backrest frame at a faster pace. ..

More specifically, in the embodiment of [a], [c] or [d] above, the backrest frame is provided with a backrest arm extending to the front side at the lower part, and the tip of the backrest arm is a reclining rotation. Illustrates an embodiment in which the lower part of the backrest frame is configured to descend when the backrest is reclining because it is rotatably supported above the front-rear middle portion of the seat frame as the center of movement.

Here, the position of the center of rotation at the tip of the backrest arm is not particularly limited, but it may be arranged within a circle having a radius of 30 mm centered on the hip point in the upright state in the side view. preferable. This is because the seated person's hip point hardly moves up and down during reclining. The "hip point in the upright state" referred to in the present specification is the torso and thigh measured by sitting a three-dimensional mannequin on the seat in accordance with JIS D0024-1985 "How to determine the H point in an automobile". The center of rotation of the part. It is located in the center between the aiming points on both sides of the 3D mannequin.

The seat frame may be fixed and immobile, but it is linked to the reclining of the backrest frame to the rear in that the increase in the opening angle between the seat and the backrest during reclining can be suppressed. It is preferable to tilt backward. Specifically, as the embodiment of the above [d], the seat frame is pivotally supported so as to be tiltable, the upper portion is pivotally attached to the middle portion in the length direction of the backrest arm, and the lower portion is pivotally attached to the rear portion of the seat frame. Illustrates an embodiment in which the seat is configured to tilt backward in conjunction with the reclining of the backrest to the rear by providing the tilt lever.

The seat and backrest may not move in the anterior-posterior direction during reclining, but the seat and backrest are behind the backrest in that the reduction in the distance between the upper part of the backrest and the rear seat is mitigated. It is preferable to move forward in conjunction with reclining to. Specifically, the vehicle seat has a support frame that is configured so that the backrest frame can be reclined and the seat frame can be tilted and slidable in the front-rear direction, and the rear of the backrest frame by transmitting power. By providing a transmission mechanism that links reclining to the back, tilting the seat frame backward, and sliding the support frame forward, it is linked to reclining backward of the backrest and tilting the seat backward. An embodiment in which the seat and the backrest are configured to move forward is illustrated.

Here, it is preferable that the transmission mechanism is configured to transmit the power supplied from one actuator to the backrest frame, the seat frame and the support frame. This is because one actuator can perform all reclining, tilting and sliding.

Next, examples of the present invention will be shown. However, the present invention is not limited to the examples, and the configuration and shape of each part may be arbitrarily changed and implemented without departing from the spirit of the invention.

FIG. 1 is a cross-sectional view of the vehicle seat 1 of the first embodiment cut at the center in the width direction and viewed from the side. The vehicle seat 1 includes a base 10 fixed to the floor f of the vehicle, a support frame 40 slidably attached to the base 10 back and forth, and a seat 50 tiltably attached to the support frame 40. The backrest 60, which is recliningly attached to the support frame 40, the actuator 20, the transmission mechanism 30 that transmits the power of the actuator 20 to the backrest 60, the seat 50, and the support frame 40, and the backrest 60 are upright. It is provided with a return device 70 for returning to the state.

The seat 50 is mounted on a seat frame 51 rotatably attached to a support frame 40 (tiltable), a stretch seat 53 stretched inside the seat frame 51 via a spring S, and a stretch seat 53. It includes a seat cushion 57 and a seat cover 58 that covers the seat cushion 57.

The backrest 60 includes a backrest frame 61 rotatably (reclining) attached to the support frame 40, an extension seat 63 stretched inside the backrest frame 61 via a spring S, and a backrest frame 61. The lumbar support 65 attached to the lower portion 62 of the above, the back cushion 67 installed on the front side of the extension seat 63 and the lumbar support 65, and the back cover 68 covering the back cushion 67 and the lumbar support 65 together. I have. The lumbar support 65 is a plate material made of nylon and has flexibility. By attaching a flexible fabric 69 extending downward to the lower portion of the backrest cover 68, the fabric 69 is attached to the lumbar support 65 via the backrest cover 68. The lower portion of the fabric 69 is detachably attached to the rear portion 52 of the seat frame 51.

The actuator 20 includes a main body 21 having a built-in electric motor attached to the rear portion of the base 10 by an actuator shaft x2, and a rod 23 capable of moving forward and backward from the front end of the main body 21 by the electric motor.

The return device 70 pivotally attaches the gas damper 73, the lower bracket 74 for axially attaching the lower portion of the gas damper 73 to the rear portion of the support frame 40, and the upper portion of the gas damper 73 to the upper and lower intermediate portions of the backrest frame 61. It is equipped with an upper bracket 76 for the purpose. The return device 70 always urges the backrest frame 61 to the upright side.

FIG. 2 is a perspective view showing the support frame 40 and the transmission mechanism 30. The support frame 40 includes a pair of left and right sliders 41, a quadrangular lower frame 43 supported by a plurality of pillars 42 on both sliders 41, and a pair of left and right support frames erected on the left and right sides of the lower frame 43. It is provided with a side frame 47. The lower frame 43 is located below the seat, and the pair of left and right side frames 47 are located on both the left and right sides of the seat. A pair of left and right slide input portions 44 projecting rearward are installed on the front side of the lower frame 43. A seat frame support portion 45 is erected on each slide input portion 44.

The transmission mechanism 30 includes a transmission member 31. The transmission member 31 includes a transmission member shaft x3 extending in the left-right direction, an input arm 32 anchored to the left and right center portions of the transmission member shaft x3 and projecting downward, and left and right center portions and left and right of the transmission member shaft x3. A pair of left and right slide arms 33 that are fixed to each end and project upward, and a pair of left and right reclining arms 35 that are fixed to both left and right ends of the transmission member shaft x3 and project upward. They are combined and they rotate together. Each slide arm 33 includes a slide slot 34 extending in the length direction thereof. The slide shaft x4 is slidably and rotatably engaged in the slide elongated hole 34 in the hole length direction, and the slide shaft x4 is attached to the slide input portion 44, so that the slide arm 33 The upper portion is pivotally attached to the slide input portion 44 so as to be slidable in the hole length direction.

FIG. 3 is a perspective view showing a frame and the like of the vehicle seat 1. The base 10 includes legs 12, an underframe 13 fixed on the legs 12, and a pair of left and right rails 14 installed on the underframe 13 that extend in the front-rear direction. The pair of left and right sliders 41 of the support frame 40 are engaged with the pair of left and right rails 14 so as to be movable back and forth and not to be moved up and down. The transmission member shaft x3 is pivotally attached to the lower front portion of the underframe 13 below the underframe 13. The seat frame 51 has a quadrangular frame shape in a plan view, and the front and rear intermediate portions of the left and right sides thereof are axially attached to the seat frame support portion 45 by a tilt axis x5.

The backrest frame 61 has a substantially square frame shape when viewed from the front, and a pair of left and right backrest arms 38 projecting to the front side are provided on both left and right sides of the lower portion 62 of the backrest frame 61. The back support arm 38 constitutes a part of the transmission mechanism 30. The tip of each backrest arm 38 is pivotally attached to the side frame 47 by a reclining shaft x6. The axis (center) of the reclining axis x6 is located at the hip point in the upright state in the side view. Pins 62a projecting laterally are provided on both left and right sides of the lower portion 62 of the backrest frame 61. Further, each side frame 47 is formed with an arc-shaped slit 49 centered on the reclining shaft x6. A pin 62a is engaged in the slit 49, and the pin 62a moves in the slit 49 at the time of reclining.

The lumbar support 65 has a plate shape extending in the length direction and the left-right direction of the backrest 60. A reinforcing member 66 extending in the left-right direction is provided on the upper portion of the lumbar support 65. The upper portion of the lumbar support 65 and the reinforcing member 66 are fixed to the fixing member 64 fixed to the lower portion 62 (lower side portion) of the backrest frame 61 by rivets R. In the upright state with the backrest 60 upright, a gap is formed between the lower part of the lumbar support 65 and the rear part of the lower frame 43. One of the male or female hook-and-loop fasteners F extending in the left-right direction is attached to the lower part of the fabric 69 attached to the lower part of the back cover. The hook-and-loop fastener F is engaged with the other hook-and-loop fastener attached to the rear portion 52 (rear side portion) of the seat frame 51.

The transmission mechanism 30 includes a pair of left and right reclining levers 37 connecting the above-mentioned transmission member 31 and the backrest frame 61, and left and right connecting the above-mentioned pair of left and right backrest arms 38 and the seat frame 51. It includes a pair of tilt levers 39. The input arm 32 of the transmission member 31 is axially attached to the tip of the rod 23 of the actuator 20 by the input shaft t1. Each reclining arm 35 of the transmission member 31 is provided with a reclining elongated hole 36 extending in the length direction thereof. The lower part (front part) of each reclining lever 37 is a reclining arm by engaging the transmission shaft t2 attached to the lower part to the reclining elongated hole 36 so as to be slidable and rotatable in the hole length direction. It is pivotally attached to the upper part of the 35 so as to be slidable in the hole length direction. The upper portion of each reclining lever 37 is pivotally attached to the side portion of the lower portion 62 of the backrest frame 61 by the backrest frame lower shaft t3. The upper portion of each tilt lever 39 is axially attached to the intermediate portion of the backrest arm 38 in the length direction by the arm intermediate axis t4. The lower portion of each tilt lever 39 is pivotally attached to the side portion of the rear portion 52 of the seat frame 51 by the seat frame rear shaft t5.

FIG. 4A is a cross-sectional view of the frame and the like of the vehicle seat 1 shown in FIG. 3 cut at the center in the width direction and viewed from the side. This figure shows a state in which the rod 23 of the actuator 20 is advanced as much as possible (upright state). On the other hand, FIG. 4B shows a state in which the rod 23 of the actuator 20 is retracted to the maximum (reclining state) from that state.

When the rod 23 of the actuator 20 is retracted (during reclining), the retracting force is transmitted from the input shaft t1 to the transmission member 31, so that the transmission member 31 moves to the front side with the transmission member shaft x3 as the center. Rotates to. The rotational power is transmitted from the slide shaft x4 to the support frame 40, so that the support frame 40 advances along the rail 14. The forward force is transmitted from the tilt shaft x5 to the seat frame 51 to advance the seat 50, and is transmitted from the reclining shaft x6 to the backrest frame 61 to advance the backrest 60.

Further, the rotational power of the transmission member 31 is transmitted to the backrest frame 61 via the transmission shaft t2, the reclining lever 37, and the backrest frame lower shaft t3, so that the backrest frame 61 is rearward with respect to the reclining shaft x6. Rotates to. As a result, the backrest 60 reclines backward. Further, the rotational power is transmitted to the seat frame 51 via the backrest arm 38, the arm intermediate shaft t4, the tilt lever 39, and the seat frame rear shaft t5, so that the seat frame 51 moves backward with respect to the tilt shaft x5. Rotate. As a result, the seat 50 tilts backward.

At this time, both the backrest frame lower shaft t3 and the arm intermediate shaft t4 move downward as the backrest frame 61 rotates (reclining) to the rear side, but the arm is higher than the backrest frame lower shaft t3. Since the intermediate axis t4 is on the reclining axis x6 side, the arm intermediate axis t4 is smaller than the backrest frame lower axis t3 and moves downward. Therefore, the arm intermediate shaft t4 moves the seat frame rear shaft t5 to the lower side smaller than the backrest frame lower shaft t3 via the tilt lever 39. Therefore, the larger the reclining angle of the backrest 60, the smaller the distance between the backrest frame lower shaft t3 and the seat frame rear shaft t5 in side view.

By the above operation, the support frame 40, the seat 50 and the backrest 60 move forward, the backrest 60 reclines backward, and the seat 50 tilts backward.

FIG. 5A is a partially enlarged view of FIG. As described above, in the upright state, the lumbar support 65 extends straight in the length direction of the backrest 60 with almost no bending, and the lower portion of the lumbar support 65 and the rear portion 46 of the lower frame 43 of the support frame 40. An interval is formed between them. FIG. 5B shows a state in which the backrest 60 is reclined to the middle. In this way, at the time of reclining to the middle, the lower portion of the lumbar support 65 comes into contact with the rear portion 46 of the lower frame 43 so as to be caught.

FIG. 5C shows a state in which the backrest 60 is reclined to the maximum extent. As described above, when the backrest 60 is further reclining rearward after the contact, the distance between the lower portion 62 (lower side) of the backrest frame 61 and the rear portion 46 (rear side) of the lower frame 43 becomes narrower. Then, the lumbar support 65 is sandwiched between them. Therefore, the lumbar support 65 bends so that the central portion projects toward the front side. The central portion that bends and protrudes to the front side pushes the lower part of the back cushion 67 toward the front side, thereby eliminating the gap between the lower part of the back cushion 67 and the waist of the seater H, and the seater H. Supports the lumbar spine.

According to this embodiment, the following effects can be obtained.
[A] In the reclining state in which the backrest 60 is reclining by a predetermined amount or more, the seated person H is comfortable in the reclining state because the lumbar spine is supported by the lumbar support 65. Moreover, the lumbar support 65 automatically projects in conjunction with reclining without any special operation.

[B] As the reclining angle of the backrest 60 increases, the distance between the lower portion 62 of the backrest frame 61 and the rear portion 52 of the seat frame 51 decreases, so that the vertical displacement of the backrest 60 is offset. The positions of the back of the seater H and the backrest 60 are kept substantially constant. Therefore, the reclining backrest 60 makes it difficult for the clothes of the upper body of the seater H to be pulled upward (obliquely backward). Therefore, also in this respect, the seated person H can comfortably recline the backrest 60.

[C] Since the axis of the reclining axis x6 is arranged at the hip point, the hip point of the seater H hardly moves up and down during the reclining. In this respect as well, the seated person H can recline comfortably.

[D] If only the reclining backrest 60 is used, the opening angle between the seat 50 and the backrest 60 increases by the amount of reclining, but at the same time, the seat 50 tilts backward, so the opening angle increases by the amount of tilt. Increase is mitigated. In this respect as well, the seated person H can recline comfortably.

[E] If only reclining the backrest 60, the distance between the upper part of the backrest 60 and the rear seats decreases during reclining, but at the same time, the seats 50 and the backrest 60 move forward, so that the distance from the rear seats decreases. It will be relaxed. Therefore, the feeling of oppression received by the seated person in the rear seat can be reduced. Therefore, the seated person H can recline comfortably in this respect as well without hesitation.

In addition, this embodiment can be changed as follows, for example.
[Change Example 1] By changing the lumbar support 65 so that its lower portion abuts on the rear portion 52 of the seat frame 51, the lumbar support 65 is placed between the lower portion 62 of the backrest frame 61 and the rear portion 52 of the seat frame 51. It may be deformed by being sandwiched between the two.
[Modification 2] By changing the lumbar support 65 to an airbag, the airbag is sandwiched between the lower portion 62 of the backrest frame 61 and the rear portion 46 of the support frame 40 during reclining, so that the airbag is placed on the front side. It may be overhanging.

1 Vehicle seat 20 Actuator 30 Transmission mechanism 38 Backrest arm 39 Tilt lever 40 Support frame (approached member)
46 Rear part of the lower frame of the support frame (approached part)
50 Seat 51 Seat frame 52 Rear part of seat frame 60 Backrest 61 Backrest frame 62 Lower part of backrest frame 65 Lumber support 67 Backrest cushion (cushion)
68 Backrest cover (cover)
69 Cloth H Seated

Claims (12)

When the backrest (60) is reclined, both portions (62, 46) of the lower portion (62) of the backrest frame (61) and the approached portion (46) of the approaching member (40) are configured to approach each other. With the backrest frame (61) and the approaching member (40),
A lumbar support (provided between the two parts (62, 46), which is deformed by receiving a force from the two parts (62, 46) during reclining and projects to the front side to support the lumbar spine of the seated person (H). 65) and a vehicle seat. The seat frame (51) is provided so that the lower part (62) of the backrest frame (61) and the rear part (52) of the seat frame (51) come close to each other when the backrest (60) is reclined.
The vehicle seat according to claim 1, wherein either the seat frame (51) or the support frame (40) supporting the seat frame (51) is the approached member (40) and the rear portion is the approached portion (46). The vehicle seat according to claim 1 or 2, wherein the lumbar support (65) is a flexible plate-like body, and the deformation is a deformation that bends toward the front side. The lumbar support (65) applies force from both parts (62,46) from the upright state in which the backrest (60) stands up until the two parts (62,46) approach each other by a predetermined amount due to reclining. It is configured so that when both parts (62, 46) approach each other by a predetermined amount or more due to reclining, the two parts (62, 46) receive a force from the two parts (62, 46) to cause the deformation. The vehicle seat according to any one of claims 1 to 3. The upper part of the lumbar support (65) is fixed to the lower part (62) of the backrest frame (61), and in the upright state, a space is formed between the lower part of the lumbar support (65) and the approached portion (46). The vehicle according to claim 4, wherein the lower portion of the lumbar support (65) comes into contact with the approached portion (46) when both portions (62, 46) approach the approached portion (46) by reclining from the upright state. Seat for. A seat frame (51) and a support frame (40) supporting the seat frame (51) are provided, the support frame (40) is an approached member (40), and the rear portion is an approached portion (46).
The vehicle seat according to claim 5, wherein a flexible fabric (69) is attached to the lumbar support (65), and the lower portion of the fabric (69) is detachably attached to the rear portion of the seat frame (51). .. A cushion (67) is installed on the front side of the lumbar support (65), and the lumbar support (65) is configured to push the cushion (67) toward the front side by projecting to the front side due to the deformation. The vehicle seat according to any one of items 1 to 6. The vehicle seat according to claim 7, further comprising a cover (68) that covers the cushion (67) and the lumbar support (65) together. The backrest frame (61) is provided with a backrest arm (38) extending to the front side at the lower part, and the front portion of the backrest arm (38) serves as a reclining rotation center of the front and rear intermediate portions of the seat frame (51). Any one of claims 1 to 8 configured such that the lower portion (62) of the backrest frame (61) is lowered when the backrest (60) is reclined by being rotatably supported upward. The vehicle seats listed in the section. The seat frame (51) is pivotally supported so that it can be tilted, and the upper portion is pivotally attached to the middle portion in the length direction of the backrest arm (38) and the lower portion is pivotally attached to the rear portion (52) of the seat frame (51). The ninth aspect of the present invention, wherein the seat (50) is configured to tilt backward in conjunction with the reclining of the backrest (60) rearward by providing the tilt lever (39). Vehicle seats. A support frame (40) configured so that the backrest frame (61) can be reclined and the seat frame (51) can be tilted and slidable in the front-rear direction.
Equipped with a transmission mechanism (30) that transmits power to link the reclining of the backrest frame (61) to the rear, the tilt of the seat frame (51) to the backward tilt side, and the slide of the support frame (40) to the front. By that
Any of claims 1 to 10, wherein the seat (50) and the backrest (60) are configured to move forward in conjunction with the reclining of the backrest (60) to the rear and the tilt of the seat (50) to the backward tilting side. The vehicle seat described in the first paragraph. 10. The eleventh aspect of claim 11, wherein the transmission mechanism (30) transmits the power supplied from one actuator (20) to the backrest frame (61), the seat frame (51), and the support frame (40). Vehicle seat.

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