JP2010208589A - Vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle seat in which a seat shell is attached to a seat frame, for damping an impact force acting on an occupant in a rear-end collision, and preventing a so-called whiplash injury. <P>SOLUTION: A seat back shell is attached to a seat back frame mounted on a vehicle body. A head rest is fixed to a predetermined position of the seat back frame. The seat back shell is movably mounted at least in the front-rear direction of the vehicle. A holding/driving portion is arranged between the seat back shell and the seat back frame, and the holding/driving portion engages the seat back shell and the seat back frame to hold them in a predetermined positional relationship. At the time of the rear-end collision of the vehicle, the holding/driving portion releases the engagement, and moves the seat back shell toward the rear side of the seat back frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle seat with a head protection function, and more particularly to a vehicle seat having a shell.

  A so-called shell-type vehicle seat in which a seat shell is combined with a seat frame is considered as disclosed in Patent Document 1, for example. This vehicle seat is configured such that a seat shell having a shape along the back of the human body, that is, along the back or the buttock, is assembled to a seat frame attached to the vehicle body, and an occupant is seated on the seat shell.

  A headrest that moves forward of a vehicle when the vehicle collides is known. This is called a headrest with a neck protection function or an active headrest. And protects the neck.

Special table 2008-526425

  The so-called shell-type vehicle seat is composed of a seat frame that supports the seat and a seat shell that is seated separately. Therefore, the active headrest used in a conventional vehicle seat that is not a shell type is replaced with the shell-type seat. It was difficult to use as it is for a vehicle seat.

  In order to solve the above problems, a vehicle seat with a head protecting function according to the present invention is configured as follows.

  The vehicle seat includes at least a seat back frame attached to the vehicle body and a seat back shell assembled to the seat back frame. A headrest is attached to the seat back frame. The headrest is basically fixed at a predetermined position with respect to the seat back frame.

  The seat back shell is attached to the front of the seat back frame so as to be movable along at least the longitudinal direction of the vehicle. Further, a holding drive unit is provided between the seat back shell and the seat back frame, and the seat back shell and the seat back frame are connected by the holding drive unit and held in a predetermined positional relationship. Then, when the vehicle is collided, the holding drive unit operates to release the connection between the seat back shell and the seat back frame.

  The vehicle seat of the present invention has the following effects.

  In a normal use state, the seat back shell is connected to the seat back frame by the holding drive unit, and reliably supports the occupant seated on the seat. If the vehicle collides, the holding drive unit operates and the connection between the seat back shell and the seat back frame is released. Then, the seat back frame moves forward due to the rear-end collision, but the pressing force is not transmitted to the seat back shell, the distance between the seat back shell and the seat back frame is narrowed, and the seat back shell is relatively rearward with respect to the seat back frame. Move to.

  Since the headrest is fixed to the seatback frame, when the seatback shell moves rearward relative to the seatback frame, the headrest protrudes forward relative to the seatback shell. As a result, the headrest can support the head of the seated occupant from behind, and protect the occupant from so-called whiplash or the like. Further, if the protective drive part is provided with an impact force absorbing function, the impact force applied to the occupant by the rear-end collision can be reduced.

It is a perspective view showing one embodiment of a seat frame of a vehicular seat concerning the present invention. It is a perspective view showing one embodiment of a seat shell of a vehicular seat concerning the present invention. It is a perspective view which shows one Embodiment of a vertical motion support mechanism. It is a perspective view which shows a latching mechanism. It is a perspective view which shows a drive mechanism. It is a perspective view showing one embodiment of a vehicular seat. It is a side lineblock diagram showing an example of a vehicular seat. It is a side lineblock diagram showing a vehicular seat at the time of operation.

  An embodiment of a vehicle seat according to the present invention will be described with reference to the drawings.

  FIG. 6 shows the sheet 10. The seat 10 is a vehicle seat and is an individual seat that is seated for each occupant, such as a driver seat or a passenger seat.

  The seat 10 includes a seat frame 12, a front-rear position adjustment mechanism 14, a seat shell 16, a headrest 18, an outer jacket material 20, and the like. Hereinafter, the traveling direction of the vehicle to which the seat 10 is attached is defined as the front, the front, rear, left, and right are determined based on the seat 10, the direction of gravity is the lower side, and vice versa.

  As shown in FIG. 1, the seat frame 12 includes a seat cushion frame 22 and a seat back frame 24. The front / rear position adjusting mechanism 14 is provided in the lower part of the seat cushion frame 22. As shown in FIG. 2, the seat shell 16 includes a seat cushion shell 26, a seat back shell 28, and the like. The jacket material 20 is provided in the outermost layer of the sheet 10 as shown in FIG. An elastic material or the like may be appropriately interposed between the jacket material 20 and the seat shell 16.

  FIG. 1 shows the overall configuration of the seat frame 12 and the longitudinal position adjusting mechanism 14. The front-rear position adjusting mechanism 14 includes two guide rails 30, an engagement mechanism (not shown), a mounting leg 34, and the like. The two guide rails 30 are arranged in parallel at a predetermined interval along the longitudinal direction of the vehicle, and are fixed on the vehicle floor (not shown) by screws or the like inserted into the mounting legs 34.

  A seat cushion frame 22 is movably held on the guide rail 30. Notches (not shown) are formed in the guide rail 30 at a predetermined pitch interval, and the seat cushion frame 22 is moved to a desired position, so that a claw portion (not shown) of the engagement mechanism is formed. Is engaged with the notch, the sheet 10 is fixed at a predetermined position. An operation bar 36 for operating the claw portion of the engagement mechanism is provided in front of the lower portion of the seat 10. The front-rear position adjusting mechanism 14 may be an electric drive type using an electric motor.

  The seat cushion frame 22 includes a pair of side cushion frames 23 provided on the left and right sides, a cushion substrate 38 that connects the left and right side cushion frames 23, and the like. As described above, the side cushion frame 23 is movably assembled to the guide rail 30. The cushion substrate 38 is a plate-like member, and left and right end portions thereof are respectively connected to the side cushion frame 23, and an elastic member 64 described later is placed on the upper surface thereof. A vertical movement support mechanism 40 is provided inside the seat cushion frame 22.

  A vertical movement support mechanism 40 is shown in FIG. The vertical movement support mechanism 40 includes a link member 42 and a cushion shell attachment member 44. The link member 42 intersects two levers in an X shape and pivotably with respect to each other.

  A pair of link members 42 are provided on the left and right, respectively, and each is connected by a connecting rod 48 as appropriate. The front lower end portion 42a of each link member 42 is connected to the side cushion frame 23 so as to be rotatable and movable back and forth. Further, the rear lower end portion 42b of each link member 42 is rotatably connected to the side cushion frame 23, respectively. The front-rear positional relationship regarding the attachment of each link member 42 and the side cushion frame 23 is not particularly limited.

  A cushion shell attachment member 44 is provided on the upper portion of the link member 42. The cushion shell attachment member 44 has a frame shape, and an attachment 46 is provided on the upper portion. A seat cushion shell 26 to be described later is fixed to the fixture 46. The rear of the cushion shell attachment member 44 is rotatably connected to the rear upper end of each link member 42. Further, the front of each cushion shell mounting member 44 is connected to the front upper end of each link member 42 so as to be rotatable and movable back and forth.

  Further, the rear of the cushion shell mounting member 44 and the rear upper end of each link member 42 are disengaged in the front-rear direction when a predetermined force is applied, and at least the cushion shell mounting member 44 is configured to be movable rearward. Has been. It should be noted that the front-rear relationship regarding the attachment of the cushion shell attachment member 44 and the link member 42 may be reversed.

  A seat back frame 24 is rotatably connected to the rear end of the seat cushion frame 22. An angle adjustment mechanism 52 is provided between the seat cushion frame 22 and the seat back frame 24, and the seat back frame 24 is rotated with an appropriate frictional force by operating a lever (not shown) of the angle adjustment mechanism 52. It is fixed at a desired angle while moving, that is, tilting along the front-rear direction. The angle adjustment of the seat back frame 24 may be performed electrically.

  As shown in FIG. 1, the seat back frame 24 includes side frames 54 positioned on the left and right, an upper frame 56 positioned on the upper portion, a lower frame 58 and the like. A pair of side frames 54 are provided on the left and right, and are connected by a lower frame 58.

  The lower frame 58 is slightly curved according to the shape of the back, and both left and right ends are fixed at positions slightly below the intermediate position of the side frame 54. Rollers 60 are provided on the left and right sides of the lower frame 58. A part of the roller 60 is exposed at least on the front surface of the lower frame 58, and is configured such that when the seat shell 16 is assembled to the seat frame 12, a driving mechanism 100 described later contacts the roller 60.

  The upper frame 56 is provided on the upper part of the side frame 54 and fixes the left and right side frames 54 at the upper part. A headrest bar 62 is attached to the center of the upper frame 56. The headrest bar 62 is fixed to the upper frame 56 at a predetermined angle with the upper frame 56. The headrest 18 is attached to the headrest bar 62 as shown in FIG. The headrest 18 may not be a continuous form with the seat back as shown in the figure, but may be a form provided separately from the seat back. Further, the height of the headrest bar 62 may be adjustable along the direction in which the headrest bar 62 is attached as long as the angle of attachment to the upper frame 56 is fixed.

  The upper frame 56 is formed, for example, in a semicircular shape and continuously with the side frame 54 with a gentle curve. Even when the boundary between the side frame 54 and the upper frame 56 is not clear, the upper frame 56 connects the side frames 54. The member is an upper frame 56. Furthermore, even if the headrest bar 62 is not directly fixed to the upper frame 56, it is sufficient that the mounting angle of the headrest 18 is fixed to the seat back frame 24. For example, the headrest bar 62 is fixed to the side frame 54 or the like. May be. Further, the mechanism for fixing the headrest bar 62 is not particularly limited. Further, a tilting mechanism may be provided on the headrest bar 62 and the headrest 18 may be configured to be tiltable in the front-rear direction.

  A locking mechanism 70 constituting a part of the holding drive unit is provided on each of the left and right upper portions of the side frame 54. As shown in FIG. 4, the locking mechanism 70 includes a mounting plate 72, a guide rail 74, a holding rod 76 extending from the guide rail 74, an engagement plate 78, and the like.

  The mounting plate 72 has a plate shape and is fixed to the side frame 54. A hole 73 is provided substantially at the center of the mounting plate 72, and a holding rod 76 is slidably passed through the hole 73. The holding rod 76 is a rod-like member and is integrally connected to the guide rail 74.

  The guide rail 74 has a substantially C-shaped cross section, and is formed so that a sliding member 90 described later is slidably fitted therein. Further, the guide rail 74 is attached to the holding rod 76 so as to be set in a substantially vertical direction when the seat back frame 24 is set at an appropriate angle. Here, the appropriate angle of the seat back frame 24 refers to an angle of the seat 10 (seat back) at which the occupant seated on the seat 10 can take a natural driving posture suitable for driving the vehicle as shown in FIG.

  A groove 80 is formed in the rear portion of the holding rod 76. The groove 80 is formed in the lateral direction, that is, in a direction perpendicular to the longitudinal direction of the holding rod 76, and fits into an engagement piece 82 of an engagement plate 78 described later. The engagement plate 78 is held by a presser plate 79 and is provided to be movable up and down along the surface of the mounting plate 72. A hole 75 through which the holding rod 76 can freely pass is formed in the engagement plate 78, and an engagement piece 82 is formed at the upper edge of the hole 75.

  A spring member 84 is connected to the engagement plate 78, and the engagement plate 78 is constantly urged by the spring member 84 in a direction in which the engagement piece 82 is fitted in the groove 80. In this way, the engaging piece 82 is fitted into the groove 80, whereby the holding rod 76 is fixed to the mounting plate 72 in a state protruding from the mounting plate 72 by a predetermined amount.

  Further, an inner wire 94 of a wire 86 is connected to the engagement plate 78. The wire 86 includes an outer tube 92 and an inner wire 94, and the inner wire 94 is accommodated in the outer tube 92 so as to be movable back and forth in the longitudinal direction. One end of the outer tube 92 is attached to a locking piece 96 provided on the side frame 54. The other end of the wire 86 is connected to the drive mechanism 100 attached to the seat shell 16. The locking mechanism 70 is not limited to the configuration of the engagement plate 78, the engagement piece 82, or the like as long as the holding rod 76 is releasably locked.

  Next, the seat shell 16 will be described. The seat shell 16 is shown in FIG. The seat shell 16 includes a seat cushion shell 26, a seat back shell 28, and the like.

  The seat cushion shell 26 is made of a hard synthetic resin material or the like, and is formed in a shape of the human body mainly from the buttocks to the thighs. The seat cushion shell 26 is screwed to the fixture 46. That is, the seat cushion shell 26 is attached to the vertical movement support mechanism 40 via the cushion shell attachment member 44.

  Between the seat cushion shell 26 and the cushion substrate 38, a sponge-like elastic member 64 (indicated by a two-dot chain line) made of a soft foam synthetic resin material or the like is disposed. The seat cushion shell 26 is elastically supported by the elastic member 64 and is held at a substantially uppermost position within the movable range of the vertical movement support mechanism 40 with an appropriate repulsive force. A hinge 32 is provided at the rear end of the seat cushion shell 26, and the seat back shell 28 is connected via the hinge 32.

  Like the seat cushion shell 26, the seat back shell 28 is made of a hard synthetic resin material or the like, and is formed in a shape along the back of the human body. The seat back shell 28 tilts along the front-rear direction with respect to the seat cushion shell 26 about the hinge 32. On the back surface of the seat back shell 28, sliding members 90 are provided on both the left and right sides of the upper part, and driving mechanisms 100 (one of the driving mechanisms 100 has only an impact absorbing function) are provided on both the left and right sides of the lower part. It has been.

  The seat cushion shell 26 and the seat back shell 28 may not be a synthetic resin material but may be a light alloy material such as aluminum, an FRP material, wood, or the like, and the material is not particularly limited. The elastic member 64 may be a metal spring, an air spring, a hydraulic cushion, or the like, not a soft foam synthetic resin material, and the mechanism is not particularly limited.

  The sliding member 90 is a pin-shaped member and is slidably fitted into the guide rail 74 described above. By fitting the sliding member 90 into the guide rail 74, the seat back shell 28 is held by the guide rail 74 and does not move in the front-rear direction, but can reciprocate up and down along the guide rail 74. It has become.

  FIG. 5 shows the drive mechanism 100. The drive mechanism 100 shown in FIG. 5 is the drive mechanism 100 disposed on the right side of the seat 10 when the seat 10 is viewed from the front in FIG. The drive mechanism 100 includes a mounting plate 102, a contact plate 104, an impact force absorber 106 provided between the mounting plate 102 and the contact plate 104, a wire drive unit 108 as an operation unit, and the like. ing. The drive mechanism 100 constitutes a part of the holding drive unit, like the locking mechanism 70 described above.

  The mounting board 102 has a front surface shape corresponding to the back surface of the seat back shell 28 and is fixed to the back surface of the seat back shell 28 by screws or the like. The rear wall 110 of the mounting board 102 is flat and is formed so as to be oriented substantially parallel to the guide rail 74 when the seat back shell 28 is attached to the seat frame 12 (seat back frame 24). A guide bar 112 is attached at a right angle to the rear wall 110 at approximately the center of the rear wall 110.

  The contact plate 104 is a flat plate-like member and is disposed in parallel with the rear wall 110. The contact plate 104 is formed with a hole through which the guide rod 112 passes. The contact plate 104 can be moved in the front-rear direction in a state substantially parallel to the rear wall 110 by the guide rod 112. Yes. Further, when the seat back shell 28 is attached to the seat frame 12 (the seat back frame 24), the back surface of the abutting plate 104 abuts on the roller 60, and can be smoothly moved up and down on the lower frame 58 by the rolling of the roller 60. It has become.

  An impact force absorbing material 106 is provided between the rear wall 110 and the contact plate 104. The impact force absorbing material 106 is made of, for example, styrene foam or the like, and is configured to be compressed or deformed or broken when a predetermined compressive force is applied. The impact-absorbing material 106 is fixed between the mounting plate 102 and the contact plate 104 by adhesion, screws, or the like, and normally retains a predetermined shape by itself, and the contact plate 104, that is, the seat back shell 28 is seated on the seat. The back frame 24 is held at a predetermined position.

  That is, the cushion shell mounting member 44 is engaged with the vertical movement support mechanism 40 at the rear, the sliding member 90 is movably fitted in the guide rail 74, and the impact force absorbing member 106 of the drive mechanism 100 further The seat back shell 28 is held at a predetermined position. As a result, the seat 10 moves up and down with the seat cushion shell 26, and the seat back shell 28 moves along the guide rail 74 in the vertical direction. Further, when a predetermined compression force or more is applied between the seat back frame 24 and the seat back shell 28, the impact absorbing material 106 is compressed and deformed or destroyed, and the seat 10 is separated from the contact plate 104 and the rear wall 110. That is, the distance between the seat back frame 24 and the seat back shell 28 is shortened.

  The wire drive unit 108 includes a cam mechanism 120 and is provided on the drive mechanism 100. A wire 86 is connected to the cam mechanism 120. The outer tube 92 of the wire 86 is attached to the main body 122 of the cam mechanism 120, and the inner wire 94 of the wire 86 is connected to the cam 124 of the cam mechanism 120.

  The cam 124 is rotatably attached to the cam shaft 126, and the inner wire 94 is connected to a position eccentric with respect to the cam shaft 126. In addition, a push bar 128 is provided below the cam 124 so as to face the cam 124. The push rod 128 is fixed to the mounting board 102. For example, when the impact force absorbing material 106 is compressed and the seat back shell 28 approaches the seat back frame 24, the push rod 128 moves relatively rearward, and the cam 124. Is rotated around the camshaft 126. Then, the cam 124 pulls the inner wire 94 against the outer tube 92.

  The other end of the wire 86 is connected to the locking mechanism 70 as described above. When the inner wire 94 is pulled with respect to the outer tube 92 in the drive mechanism 100, the engagement plate 78 of the locking mechanism 70 is pulled up against the spring force of the spring member 84. When the engagement plate 78 is pulled up, the engagement piece 82 is pulled out from the groove 80, the connection of the holding rod 76 with the mounting plate 72 is released, and the movement is free along the axial direction.

  Next, functions and effects of the sheet 10 will be described.

  FIG. 7 shows the seat 10 in a state where an occupant is seated. A seat 10 in FIG. 7 is a seat in a normal state assembled to a vehicle. Specifically, the seat 10 fixes the guide rail 30 to the vehicle floor (both not shown) through attachment screws to the attachment legs 34, and appropriately operates the front / rear position adjustment mechanism 14 to appropriately adjust the front / rear direction. The seat cushion frame 22 is set at a position, and the angle adjustment mechanism 52 is further operated to fix the seat back frame 24 to the seat cushion frame 22 at a predetermined angle.

  An elastic material is appropriately provided on the upper surface of the seat shell 16, and the covering material 20 covers the entire sheet 10 on the elastic material. The seat cushion shell 26 is supported by the elastic member 64 with an appropriate elastic force in the vertical direction.

  The seat back shell 28 is slidably fitted into the guide rail 74 by the sliding member 90, and is pressed against the seat back frame 24 via the drive mechanism 100. In the drive mechanism 100, the mounting plate 102 and the contact plate 104 are held at a predetermined interval with the impact force absorbing material 106 interposed therebetween. Thus, the waist portion of the seat back shell 28 is held at a predetermined position with respect to the seat back frame 24. Further, the engaging piece 82 is fitted in the groove 80, and the holding rod 76 is locked to the mounting plate 72. As a result, the guide rail 74 is fixed in a state where the guide rail 74 protrudes forward from the mounting plate 72 by a predetermined amount, and the shoulder portion of the seat back shell 28 is held at a predetermined position with respect to the seat back frame 24. In this state, the occupant A is seated on the seat 10 as shown in FIG.

  When the occupant A sits on the seat 10, the link member 42 of the vertical movement support mechanism 40 slightly operates while the elastic member 64 is deformed by the occupant's weight, and the seat cushion shell 26 sinks appropriately to hold the occupant. When the seat cushion shell 26 sinks, the seat back shell 28 connected to the seat cushion shell 26 by the hinge 32 moves the sliding member 90 downward along the guide rail 74, and the drive mechanism 100 moves on the roller 60. And move downward together with the seat cushion shell 26.

  When the vehicle vibrates in the vertical direction while the vehicle is running, the seat cushion shell 26 moves up and down with respect to the seat cushion frame 22. In contrast, the seat back shell 28 smoothly follows the up and down movement of the seat cushion shell 26 by the sliding of the sliding member 90 in the guide rail 74 and the reciprocating movement of the contact plate 104 on the roller 60. Further, even when the angle adjustment mechanism 52 is operated to change the angle of the seat back frame 24, the angle of the guide rail 74 is changed along with the change of the angle of the seat back frame 24, and the setting of the guide rail 74 is performed. The seat back shell 28 reciprocates (vertically moves) along the corner.

Next, a case where a vehicle is rearranged will be described.
When the vehicle collides, the entire vehicle is pushed forward. Then, the seat frame 12 applies a pressing force to the occupant A from behind. When the pressing force exceeds a predetermined value, the engagement between the cushion shell attachment member 44 and the vertical movement support mechanism 40 is released, and the cushion shell attachment member 44 moves rearward with respect to the vertical movement support mechanism 40.

  Then, the impact force absorbing member 106 provided in the drive mechanism 100 is sandwiched between the seat back shell 28 and the seat back frame and receives a compression force. When a compressive force of a predetermined value or more is applied to the impact force absorbing material 106, the impact force absorbing material 106 starts to contract. When the impact force absorbing material 106 is contracted and deformed, the distance between the mounting plate 102 and the contact plate 104 is narrowed, and the push rod 128 protrudes rearward from the contact plate 104.

  The push bar 128 protruding rearward contacts the cam 124 and rotates the cam 124 about the cam shaft 126. When the cam 124 rotates, the inner wire 94 attached to the cam 124 is pulled with respect to the outer tube 92. When the inner wire 94 is pulled by the drive mechanism 100, the wire 86 pulls up the engagement plate 78 in the locking mechanism 70. When the engagement plate 78 is pulled up by a predetermined amount, the engagement between the engagement piece 82 and the groove 80 is released, and the holding rod 76 is free to move in the axial direction with respect to the mounting plate 72.

  If the pressing force to the occupant A by the rear-end collision continues, the impact force absorbing material 106 is compressed or deformed and the waist portion of the occupant A moves rearward with respect to the seat frame 12 and the locking mechanism 70 At this point, the retaining rod 76 is unlocked, so that the shoulder portion of the seat back shell 28 also starts to move backward. As a result, the occupant A moves backward as a whole, and is pressed against the seat frame 12 while seated on the seat shell 16 as shown in FIG. On the other hand, since the headrest 18 is fixed to the seat frame 12 and the positional relationship with the seatback frame 24 does not change, the headrest 18 moves relatively forward with respect to the rearward movement of the seat shell 16.

  Therefore, as shown in FIG. 8, the headrest 18 supports the occupant's head, prevents the neck from bending backward, and prevents so-called whiplash. In addition, the impact force applied to the occupant A can be reduced because the impact force absorbing member 106 absorbs the impact force absorbing member 106 by compressing deformation or being damaged.

  The vehicle seat according to the present invention may be a seat on which a plurality of people are seated. The seat 10 is not limited to a so-called automobile seat.

  The present invention can be used for a vehicle seat.

DESCRIPTION OF SYMBOLS 10 ... Seat 12 ... Seat frame 16 ... Seat shell 18 ... Headrest 22 ... Seat cushion frame 24 ... Seat back frame 26 ... Seat cushion shell 28 ... Seat back shell 62 ... Headrest bar 70 ... Locking mechanism 74 ... Guide rail 76 ... Holding Rod 78 ... engaging plate 80 ... groove 82 ... engaging piece 86 ... wire 90 ... sliding member 96 ... locking piece 100 ... drive mechanism 102 ... mounting plate 104 ... contact plate 106 ... impact force absorbing material 108 ... wire drive unit 124 ... Cam 128 ... Push rod

Claims (5)

A seat back frame;
A headrest attached to the seat back frame;
A seat back shell assembled to the seat back frame so as to be movable in the front-rear direction;
Provided between the seat back frame and the seat back shell, maintaining a longitudinal distance between the seat back frame and the seat back shell, and by a pressing force generated between the seat back frame and the seat back shell. A vehicle seat comprising: a holding drive unit that changes the interval in the front-rear direction. The holding drive unit includes a locking mechanism provided above the seat back shell and a drive mechanism provided below the seat back shell,
The locking mechanism engages the seat back frame and the seat back shell, and maintains a front-rear direction interval between the seat back frame and the seat back shell,
The drive mechanism can be shortened in the front-rear direction length by an impact force in the vehicle front-rear direction applied between the seat back shell and the seat back frame,
Further, the locking mechanism is connected to the drive mechanism, and is configured to release the engagement between the seat back frame and the seat back shell when the longitudinal length of the drive mechanism is shortened. The vehicle seat according to claim 1. A seat frame fixed to the vehicle body,
A seat shell attached to the seat frame;
A vehicle seat comprising a headrest provided on the seat frame;
The seat frame comprises a seat cushion frame and a seat back frame,
The seat shell comprises a seat cushion shell and a seat back shell,
At least the seat back shell is assembled to the seat back frame so as to be movable in the front-rear direction.
A holding drive unit is provided between the seat back frame and the seat back shell,
The holding drive unit holds the front-rear direction interval between the seat back frame and the seat back shell, and the pressing force generated between the seat back frame and the seat back shell causes the seat back frame and the seat back shell. A vehicle seat characterized in that the front-rear direction interval can be shortened. The holding drive unit includes a locking mechanism provided above the seat back shell and a drive mechanism provided below the seat back shell,
The locking mechanism includes a holding bar extending in the front-rear direction and a locking plate with which the holding bar engages, and the holding bar holds a distance in the front-rear direction between the seat back frame and the seat back shell,
The drive mechanism is provided between the seat back shell and the seat back frame, and an impact force absorbing material capable of shortening the length in the front-rear direction by an impact force in the vehicle front-rear direction, and an operation unit for operating the locking mechanism With
The impact-absorbing material is shortened in the front-rear direction by a pressing force generated between the seat back frame and the seat back shell, and the operation unit operates the locking mechanism, and the holding rod and the locking plate The vehicle seat according to claim 3, wherein the engagement is released.   The vehicle seat according to any one of claims 1 to 3, wherein the holding drive unit includes an impact force absorbing material that absorbs an impact force generated in a vehicle front-rear direction.

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