JP5372542B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat such as a vehicle seat, and more particularly to a vehicle seat that reduces the impact applied to the neck during a rear-end collision.

  In the case of a so-called rear collision, such as when a car is collided from the rear or a rear-end collision, the head of the seated occupant tilts backward due to inertia and the neck is impacted. There is a risk of receiving it.

  For this reason, on vehicle seats such as vehicle seats, in order to protect the occupant's head and neck from impact caused by a rear impact and reduce the impact on the neck, A headrest is provided. In order to effectively reduce the impact at the time of the rear collision, it is desirable to quickly reduce the gap between the occupant's head and the headrest at the time of the rear collision.

  For this reason, the upper body of the occupant is moved rearward at the time of a rear collision, the load due to this movement is received by the pressure receiving member (movable plate), the headrest is moved forward, the head of the occupant is supported, and the neck is impacted. There has been proposed a seat back configured to reduce (Patent Document 1).

  To quickly reduce the gap between the occupant's head and the headrest at the time of a rear collision, there is a method by moving the headrest forward as in Patent Document 1, but the upper part of the occupant is deeply inserted into the seat back. It can be realized that the occupant's head approaches the headrest and the gap is reduced as a result.

JP 2003-341402 A

  By the way, in both the configuration in which the headrest operates and the configuration in which the headrest does not operate as in the above-described Patent Document 1, the pressure-receiving member in the seat back is pushed rearward with a predetermined load or more by the upper body of the occupant at the time of a rear collision. When the occupant's upper body enters, it is desirable that the occupant enter the seat back as deeply as possible.

  However, in the conventional vehicle seat, since the seat back cushion provided in the seat back is difficult to deform, the load applied to the seat back from the occupant's upper body at the time of a rear collision is transmitted to the pressure receiving member. There was a problem of resistance.

  The present invention has been made in view of the background as described above, and provides a vehicle seat that can efficiently transmit a load applied to a seat back from an occupant's upper body to a pressure receiving member at the time of a rear collision. Objective.

  The vehicle seat of the present invention that solves the above-described problems includes a side frame that is spaced apart from the left and right and extends in the vertical direction, a pressure receiving member that is disposed between the side frames, the pressure receiving member, and the side frame. And a seat back cushion provided at least in front of the pressure receiving member, and the pressure receiving member moves rearward when a predetermined or greater load is applied to the seat back cushion from the occupant. A seat for a vehicle configured as described above, wherein the seat back cushion includes a central portion that supports an upper body portion of the occupant, and a side that is provided continuously to the central portion on both lateral sides of the central portion. A front concave portion formed of continuous or intermittent dents on both the front surface and the rear surface along a portion corresponding to the boundary between the central portion and each side portion. Beauty rear recess is formed, the rear recess, characterized in that arranged in the lateral direction inside the front recess.

  According to such a configuration, the seat back cushion has a front recess and a rear recess each including a continuous or intermittent recess on the front surface and the rear surface, along a portion corresponding to the boundary between the center portion and each side portion. Be placed. The rear concave portion is arranged on the inner side in the left-right direction with respect to the front concave portion, so that the connecting portion (the portion from the front concave portion to the rear concave portion) that connects the central portion and each side portion is left and right when viewed in a horizontal section. The shape extends from the outside in the direction to the inside and further forwards. Therefore, at the time of a rear collision, the connecting portion is deformed, so that the central portion is relatively easily moved backward. That is, the seat back cushion is less likely to become a resistance, and the load applied from the upper body of the occupant to the seat back can be efficiently transmitted to the pressure receiving member.

  In the vehicle seat described above, it is desirable that the bottom portion of the rear surface recess is located in front of the bottom portion of the front surface recess. In this way, when the bottom of the rear recess is positioned in front of the bottom of the front recess, the connecting portion between the rear recess and the front recess extends in the front-rear direction, so that a load on the rear of the seat back cushion is applied to the center. When hooked, the direction (shape) of the connecting portion can be greatly changed, and the center portion can easily move rearward with respect to the side portion.

  The vehicle seat described above further includes a skin member that covers the seat back cushion, the skin member having an insertion portion that is inserted into the front recess, and the insertion portion is provided at a bottom portion of the front recess. It is desirable that the bottom portion of the rear concave portion is coupled to the front of the leading end of the insertion portion.

  In this way, since the rear concave portion is formed deep enough to be positioned in front of the front end of the skin member insertion portion, the connecting portion extends longer in the front-rear direction, so the central portion is on the side portion. On the other hand, it becomes easier to move backward.

  In the vehicle seat described above, the seat back cushion is provided with a lining on the rear surface, and the lining is provided with a cut at a portion corresponding to a boundary between the central portion and the side portions. Can do.

  According to such a configuration, even when the seat back cushion is reinforced by the lining, the deformation of the seat back cushion at the connecting portion that connects the central portion and each side portion is not hindered. It is easy to move backward with respect to the part.

  In the above vehicle seat, the connecting member is rotatably supported by the side frame, and includes a rotating member to which the pressure receiving member is connected, and a biasing member that biases the rotating member. The side frame has a stopper projecting inward in the left-right direction that restricts the rotation range of the rotating member, and the side frame has the seat back cushion inserted between the stopper and the rotating member. In order to prevent this, at least a part may extend inward in the left-right direction corresponding to the stopper.

  According to such a configuration, when the seat back cushion moves relatively rearward at the time of a rear collision, a part of the seat back cushion is formed between the stopper and the rotating member by the portion extending inward in the left-right direction of the side frame. Intrusion is suppressed. Therefore, the operation of the rotating member can be ensured, and the central part can be moved sufficiently backward with respect to the side part.

  According to the configuration of the first aspect, since the seat back cushion is easily deformed at the connection portion between the central portion and each side portion, the seat back cushion is less likely to become a resistance, and a load applied from the upper body of the occupant to the seat back is reduced. It can be efficiently transmitted to the pressure receiving member.

  According to the configuration of the second aspect, since the connecting portion between the central portion and each side portion extends in the front-rear direction, when a load is applied to the central portion of the seat back cushion, the direction of the connecting portion ( (Shape) can be greatly changed, and the central part can be easily moved rearward with respect to the side part.

  According to the structure of Claim 3, since the connection part of a center part and each side part is extended further in the front-back direction, a center part becomes easier to move back with respect to a side part.

  According to the configuration of the fourth aspect, even when the seat back cushion is reinforced by the lining, the deformation of the seat back cushion at the connection portion is not hindered, so that the central portion is rearward with respect to the side portion. Easy to move to.

  According to the structure of Claim 5, the action | operation of a rotation member is ensured and a center part can be fully moved back with respect to a side part.

It is a perspective view of a vehicle seat. It is a perspective view of a seat frame. It is an expansion perspective view of a connection member. It is a disassembled perspective view of a connection member. It is VV sectional drawing of FIG. FIG. 4 is a side sectional view (a) showing a seat back frame in a normal state and a side sectional view (b) showing a state of the seat back frame at a rear collision. It is the horizontal sectional view (a) which shows the seat back cushion at the time of normal, and the horizontal sectional view (b) which shows the seat back cushion at the time of rear collision. It is a figure equivalent to the VV cross section of FIG. 1 of the vehicle seat which concerns on a modification. It is the front view (a) of the 1st modification of a pressure receiving member, and IX-IX sectional drawing (b) of (a). It is the front view (a) of the 2nd modification of a pressure receiving member, and XX sectional drawing (b) of (a).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a vehicle seat S as an example of a vehicle seat according to the present invention includes a seat back S1, a seating portion S2, and a headrest S3.

  In the vehicle seat S, a seat frame F as shown in FIG. 2 is provided. The seat frame F includes a seat back frame 1 that is a frame of the seat back S1 and a seating frame 2 that is a frame of the seating portion S2. The seating frame 2 and the seat back frame 1 are connected via a reclining mechanism 3. A cushion and a skin (see FIG. 5 for the seat back S1) are provided on the outside of the seat back frame 1 and the seating frame 2, so that the seat back S1 and the seating portion S2 are configured.

  The seat back frame 1 is framed by a side frame 10 that is spaced apart from the left and right and extends in the vertical direction, an upper frame 21 that connects the upper ends of the side frame 10, and a lower frame 22 that connects the lower ends. Configured. A pressure receiving member 20 made of a plate-shaped resin is disposed between the left and right side frames 10, and the pressure receiving member 20 is connected to the side frame 10 via the connecting member 4. In the present specification, front, rear, left and right are based on an occupant seated on the vehicle seat S in a normal state where the seat back S1 is raised.

  The upper frame 21 is provided with a pillar support portion 23, and the pillar support portion 23 is provided with a headrest frame (not shown). The headrest S3 described above is configured by providing a cushion member on the outside of the headrest frame.

  The side frame 10 is formed by pressing a sheet metal, and as shown in FIG. 3, as shown in FIG. 3, a substantially flat side plate 11, and a front edge portion 12 formed by folding the front end portion of the side plate 11 inward in a U shape. The rear edge portion 13 is bent inward in an L-shape. As shown in FIG. 4, a support hole 14 for supporting a rotating member 40 described later is formed at a height position corresponding to the occupant's flank, for example, a position about 20 cm from the lower end. Is slightly drawn and protrudes inward to form a curved portion 15. The curved portion 15 serves to increase the rigidity around the support hole 14. Above the support hole 14 is provided a spring locking portion 16 for supporting the upper end of the coil spring 48, and below the support hole 14, stoppers 17 and 18 provided to protrude inwardly are provided apart in the front-rear direction. ing. The stoppers 17 and 18 serve to regulate the operating range of the rotating member 40. The front edge 12 and the rear edge 13 extend inward in the left-right direction on the front and rear sides of the stoppers 17 and 18, respectively, so that the seat back cushion 50 is interposed between the rotating member 40 and the stoppers 17 and 18. The entry is suppressed.

  As shown in FIG. 4, the connecting member 4 has a rotating member 40, a bolt 61 for rotatably supporting the rotating member 40 on the side frame 10, and the pressure receiving member 20 biased forward. A coil spring 48 as an example of a biasing member that biases the rotating member 40 in the direction, a lower wire 46 that connects the lower part of the pressure receiving member 20 to the rotating member 40, and an upper part of the pressure receiving member 20 is connected to the side frame 10. And an upper wire 47 (see FIG. 2). The connecting member 4 is provided symmetrically on the left and right sides of the pressure receiving member 20.

  The lower wire 46 and the upper wire 47 are respectively engaged with claw portions (not shown) formed on the pressure receiving member 20. The upper wire 47 is engaged with a locking hole 49 (see FIG. 2) provided in the side frame 10.

  As shown in FIG. 4, the rotating member 40 is formed by pressing a sheet metal, and a main body portion 41 extending vertically, and a rear edge portion 42 formed by bending the rear end portion of the main body portion 41 inward in an L shape. have. By bending the rear end side in this way, moderate rigidity is ensured while leaving a front space, that is, a space for the occupant to enter the seat back S1. A shaft hole 43 is formed slightly above the center of the main body 41. A locking hole 44 is formed at the lower end of the main body 41 that is spaced downward from the shaft hole 43, and a lower wire 46 is engaged with the locking hole 44. The shaft portion 61A of the bolt 61 is inserted into the shaft hole 43, and the rotating member 40 is pivotally supported. Specifically, the bolt 61 is inserted into the support hole 14 from the outside of the side frame 10 and attached to the side frame 10 by adhesion or welding. Then, the shaft hole 43 of the rotating member 40 is inserted into the shaft portion 61A protruding inside the side frame 10, and the nut 65 is tightened in a state where the rotating member 40 can rotate around the shaft portion 61A.

  A spring locking portion 45 that locks the lower end of the coil spring 48 is provided slightly above the locking hole 44 of the rotating member 40. The upper end of the coil spring 48 is locked to the spring locking portion 16 of the side frame 10 described above, and the lower end is locked to the spring locking portion 45 of the coil spring 48 in the pulled state. Since the spring locking portion 45 of the rotating member 40 is located in front of the line connecting the spring locking portion 16 of the side frame 10 and the support hole 14 in a side view, the rotating member 40 is always A rotational force is applied clockwise by the coil spring 48 in FIG.

  The stoppers 17 and 18 described above are positioned in front of and behind the rotating member 40 below the shaft hole 43 of the rotating member 40, respectively, and restrict the movement of the rotating member 40 back and forth to a predetermined position. Yes.

  In this way, in the normal state, the rotating member 40 is urged so that the lower part rotates forward, and the position thereof is regulated by the stopper 17. The pressure receiving member 20 is urged forward by the urging force of the coil spring 48 through the locking hole 44 of the rotating member 40. The urging force causes the upper body of the occupant to lean against the seat back S1. ing. The initial tension load of the coil spring 48 is set larger than the force pulled through the pressure receiving member 20 in a normal operating environment. Since the initial load is smaller than the tensile load applied at the time of the rear collision, the pressure receiving member 20 receives the weight of the upper body of the occupant and the received force is transmitted via the lower wire 46 as will be described later. The rotating member 40 is rotated backward (counterclockwise in FIG. 4).

  As shown in FIG. 5, a seatback cushion 50 is provided outside the seatback frame 1 to cover the front side of the pressure receiving member 20 and the side frame 10 and the side and rear of the side frame 10. A skin member 70 made of fabric or leather is provided on the outside of the seat back cushion 50.

  The seat back cushion 50 has a central part 51 that supports the upper body part of the occupant, and side parts 52 that are provided continuously to the central part 51 on both sides in the left-right direction of the central part 51 (see also FIG. 7). ing. In many cases, the side portion 52 protrudes slightly forward from the central portion 51 to support the occupant's body side. However, the side portion 52 is not limited to such a configuration, and is formed on substantially the same plane as the central portion 51. Sometimes it is done. In this case, the position where the occupant should be seated may be indicated by the stitches or design of the skin, so that the occupant can sit with the upper body in front of the pressure receiving member 20.

  The front surface of the seat back cushion 50 is formed with a front groove 53 formed of a recess continuously provided in the vertical direction as an example of a front concave portion along the boundary between the central portion 51 and the left and right side portions 52. Has been. A rear surface groove 54 is formed on the rear surface of the seat back cushion 50 as an example of a rear surface concave portion extending continuously up and down along the boundary between the central portion 51 and the left and right side portions 52. The rear groove 54 is disposed inside the front groove 53 in the left-right direction. For this reason, after the connection part 59 (part shown by dark hatching) of the center part 51 and the side part 52 extends inward in the left-right direction from the side part 52 as shown in the connection part center line L1 shown in FIG. Extends forward. Further, due to the presence of the rear groove 54, the seat back cushion 50 has a small thickness between the bottom 54 </ b> A of the rear groove 54 and the front surface of the seat back cushion 50. Thereby, the connection part 59 is easy to deform | transform and it becomes easy for the center part 51 to move back with respect to the side part 52. FIG.

  The rear groove 54 has a bottom 54 </ b> A located in front of the bottom 53 </ b> A of the front groove 53. For this reason, the connection portion 59 has a shape extending forward in the inner portion, that is, a shape elongated toward the front, as shown by the connection portion center line L1 in FIG. Makes it easier to move backwards.

  On the bottom 53A of the front groove 53, a plurality of locking rings 56 that fasten a skin member 70 to be described later are provided side by side (only one is shown).

  The skin member 70 has a central skin portion 71 that covers the front surface of the central portion 51 of the seat back cushion 50, a shoulder skin portion 72 that covers the side portion 52, and a back side skin portion 73 that covers the rear surface of the seat back S1. . A connecting portion between the central skin portion 71 and the shoulder skin portion 72 serves as an insertion portion 74 that is inserted into the front groove 53, and the insertion portion 74 is prevented from being spread by being sewn by the stitching portion 78. A hook 75 is provided at the tip 74A of the insertion portion 74 (the rear end in FIG. 5). The hooks 75 are provided corresponding to the locking rings 56, and each hook is engaged with the locking ring 56.

  The deeper the rear groove 54, the easier it is to move the central portion 51 rearward due to the deformation of the connecting portion 59. Therefore, the position of the bottom 54A of the rear groove 54 is the rear groove indicated by the phantom line L2 in FIG. It is desirable that it is located ahead of the tip 74A of the insertion portion 74 as in the shape of.

  A lining 55 for reinforcing the seat back cushion 50 is provided on the rear surface of the seat back cushion 50. The lining 55 is made of woven fabric, non-woven fabric, plastic sheet or the like. In the lining 55, a cut 55 </ b> A is continuously formed in a vertical direction at a portion corresponding to the rear surface of the connecting portion 59 (a portion corresponding to the boundary). As shown in FIG. 5, the cut 55 </ b> A may be formed like a slit so that the lining 55 </ b> B corresponding to the central portion 51 and the lining 55 </ b> C corresponding to the side portion 52 are separated by a predetermined distance in the left-right direction. Although not shown, the lining 55 may be cut with a cutter or the like so that the lining 55B and the lining 55C are hardly separated in the left-right direction. Even if the seat back cushion 50 is reinforced by the lining 55, the connection portion 59 can be easily deformed by such a cut 55A.

The operation of the seat back frame 1 according to the present embodiment configured as described above will be described.
As shown in FIG. 6A, in a normal state, the rotating member 40 is pulled up by the coil spring 48 at the spring locking portion 45 and the lower portion is urged forward, and is positioned by contacting the stopper 17. Yes. At this time, the force that the upper body of the passenger P leans against the seat back S1 (not shown) is applied to the pressure receiving member 20 via a cushion (not shown), but the initial load of the coil spring 48 is the pressure receiving member in a normal driving environment. Since it is set larger than the load pulled through 20, the pressure receiving member 20 can receive the load applied from the upper body of the occupant P without operating.

  When the rear collision occurs, as shown in FIG. 6B, the upper body of the occupant P moves rearward with respect to the seat back S1, is pressed against the seat back S1, bends in a bow, and is loaded on the pressure receiving member 20. F1 is applied. The pressure receiving member 20 applies a force to rotate backward with respect to the lower portion of the rotating member 40 via the lower wire 46. When this force exceeds the load that urges the rotating member 40 forward by the coil spring 48, the rotating member 40 rotates rearward and is in the direction as shown in FIG. As a result, the upper body of the occupant P enters the seat back S1 deeply, and the head approaches the headrest S3 relatively as compared with the case where it does not enter, and the impact on the neck is alleviated. In the present specification, to make the occupant enter the seat back deeply means that the occupant's body pushes the seat back cushion 50 and moves the occupant's body to the position where the seat back cushion 50 was.

  The coil spring 48 is extended by the rearward rotation of the rotating member 40 and the tensile load becomes higher, but the ratio of the downward movement amount (direction in which the coil spring 48 extends) to the rearward movement amount of the spring locking portion 45. Therefore, once the load of the occupant P exceeds the supporting force due to the initial load of the coil spring 48 at the time of a rear collision, the rotating member 40 does not stop halfway and rotates at a stretch to the direction of FIG. To do. That is, the rotational force of the rotating member 40 by the coil spring 48 is such that the initial position of the rotating member 40 and the post-operation position of the rotating member 40 are maximized within the rotation range of the rotating member 40, and the coil spring. 48 locking positions are set.

  The deformation of the seat back cushion 50 at the time of the rear collision will be described with reference to FIG. As shown in FIG. 7A, at the normal time, the inner end portion of the connection portion center line L1 is substantially directed forward. When a rear collision occurs, as shown in FIG. 7 (b), the center portion 51 is pushed rearward relative to the side portion 52 by the load F1 of the occupant P, and the connection portion 59 is deformed rearward to center the connection portion. The inner end portion of the line L1 is directed to the side (inner side) from FIG. As described above, the connecting portion 59 is deformed while changing its direction like an arm, so that the central portion 51 is easily moved rearward with respect to the side portion 52. That is, when the occupant P moves rearward at the time of a rear collision, the seat back cushion 50 is less likely to become resistance, and the load applied to the seat back S1 (the central portion 51 of the seat back cushion 50) from the upper body of the occupant P is efficiently received by the pressure receiving member. 20 can tell.

  And according to the vehicle seat S of the present embodiment, the bottom portion 54A of the rear groove 54 is located in front of the bottom portion 53A of the front groove 53 and the tip 74A of the insertion portion 74 of the skin member 70. The connecting portion 59 is particularly easily deformed, and the central portion 51 is likely to move backward relative to the side portion 52.

  Further, the vehicle seat S has a lining 55 on the rear surface of the seat back cushion 50, but the lining 55 has a cut 55 </ b> A extending vertically corresponding to the connection portion 59, so that the lining 55 is connected to the connection portion 59 at the time of rear collision. Therefore, the central portion 51 is likely to move backward relative to the side portion 52.

  Further, the vicinity of the stoppers 17 and 18 is almost covered by the front edge portion 12 and the rear edge portion 13 formed by bending the edge of the side frame 10, respectively. In addition, it is possible to prevent other members such as cushions and harnesses from being sandwiched from before and after the stoppers 17 and 18, and a sufficient stroke of the rotating member 40 can be ensured. This also increases the certainty that the occupant P enters the seat back S1 deeply.

  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 above-described embodiment and the following modified examples, the seat back frame 1 is arranged such that members such as the seat back cushion 50 and the harness are jammed, so that a little space in the seat back S1 is secured. It is effective for the passenger P to easily enter the seat back S1.

  In the above-described embodiment, the front groove 53 continuously extending in the vertical direction is illustrated as an example of the front concave portion. However, the front concave portion may be a concave portion arranged intermittently in the vertical direction. However, as for the front concave portion, the groove portion formed by the concave portions formed continuously as in the above-described embodiment can facilitate the deformation of the connecting portion 59. Similarly, in the embodiment, as an example of the rear surface recess, the rear groove 54 that extends continuously up and down is illustrated, but the rear surface recess may be a recess that is arranged intermittently in the vertical direction. However, the groove on the rear surface having a continuously formed recess can facilitate the deformation of the connecting portion 59 as in the above embodiment.

  In the above-described embodiment, the rotating member 40 has been described as rotating independently of the headrest S3. However, as in Patent Document 1, the vehicle seat in which the headrest S3 moves forward in accordance with the operation of the pressure receiving member. The present invention can also be applied to.

  In the above-described embodiment, as an example of the cut of the lining 55, the continuous cut in the vertical direction is shown. However, the cut in the present invention is a so-called perforated cut extending in the vertical direction. May be.

  In the above-described embodiment, only one front concave portion and one rear concave portion are shown. However, as shown in FIG. 8, the front concave portion 153 and the rear concave portion 154 are repeatedly provided to connect the connecting portion 159 of the seat back cushion 150. You may form in an accordion form. According to such a form, since the deformation of the connecting portion 159 becomes easier, the central portion 151 can be easily moved rearward with respect to the side portion 152.

  In the above-described embodiment, the lining 55 is provided on the rear surface of the seat back cushion 50, but the same cloth as the lining 55 may be provided across at least the center portion 51 and the side portion 52 on the front surface of the seat back cushion 50. Good. In this case, in order to facilitate the deformation of the connecting portion 59 at the portion corresponding to the boundary between the central portion 51 and the side portion 52, the portion is continuously cut up and down like the break portion 55, that is, the cut 55A of the lining 55. It is good to provide the part which is cut | disconnected, the part cut | disconnected intermittently like a perforation, or the part which becomes thin and weak. For example, it is good to provide the perforation which extends up and down by the part stuck to the front-surface recessed part (front-surface groove | channel 53) among the power cloths stuck to the front surface of the seat back cushion 50. By doing in this way, the load applied to the bundling at the time of rear collision concentrates on the broken part, and the bundling breaks or the connecting part 59 breaks in some cases, so that the central part 51 can easily move backward. .

  Further, such a blanket may be provided not on the seat back cushion 50 but on the back of the skin member 70 by pasting or sewing. In this case, it is preferable to provide a breaking portion that extends in the vertical direction at a portion corresponding to the boundary between the central portion 51 and the side portion 52 in the bundling, for example, at a portion corresponding to the insertion portion 74. Also in this case, the load on the skin member 70 is concentrated at the portion corresponding to the rupture portion of the bundling at the time of rear collision, so that the burping and the skin member 70 are easily broken at the rupture portion, and the central portion 51 of the seat back cushion 50 is obtained. Becomes easier to move backwards.

  Further, the skin member 70 itself may be provided with a break portion at a portion corresponding to the boundary between the central portion 51 and the side portion 52 of the seat back cushion 50. By doing in this way, at the time of a rear surface collision, the skin member 70 breaks | ruptures in a fracture | rupture part, and the center part 51 becomes easy to move back.

In addition, by making the pressure receiving member 20 easier to deform, it is possible to make it easier for the occupant P to move rearward in the event of a rear collision.
For example, as shown in FIGS. 9A and 9B, the pressure receiving member 120 according to the first modification has a thin portion 121 extending in the entire vertical direction at the center in the left-right direction. The thin portion 121 is formed by providing a recess 122 on the front surface of the pressure receiving member 120 and a recess 123 on the rear surface. And the lower wire 46 and the upper wire 47 are comprised with the material and diameter which are moderately easily deformable so that the bending of the pressure receiving member 120 in the thin part 121 may not be inhibited. By providing such a thin portion 121, the pressure receiving member 120 is easily bent at the thin portion 121 at the time of a rear collision, and the occupant P is easily moved backward. Note that the thin portion 121 may be provided so as to extend only in a part of the pressure receiving member 120 in the vertical direction.

  Further, as shown in FIGS. 10A and 10B, the pressure receiving member 220 according to the second modified example is formed with a thin portion 221 extending in the entire vertical direction at the center in the left-right direction, and on the thin portion 221, Intermittent holes 225 are formed side by side. The thin portion 221 is formed by providing a recess 222 on the front surface of the pressure receiving member 220 and a recess 223 on the rear surface. By providing such a thin portion 221 and the hole 225, the pressure receiving member 220 is easily broken at the thin portion 221 at the time of a rear collision, and the occupant P is easily moved rearward.

  Moreover, in the said embodiment, although the vehicle seat S was shown as an example of application of a vehicle seat, the vehicle seat of this invention is applied to the sheet | seat for other vehicles, for example, a ship, and an aircraft. You can also.

4 connecting member 10 side frame 11 side plate 12 front edge portion 13 rear edge portion 17 stopper 20 pressure receiving member 40 rotating member 48 coil spring 50 seat back cushion 51 central portion 52 side portion 53 front groove 53A bottom portion 54 rear surface groove 54A bottom portion 55A backing 55A Cut 59 Connection part 70 Skin member 74 Insertion part 74A Tip S Vehicle seat S1 Seat back

Claims (5)

Side frames that are spaced apart from each other and extend in the vertical direction, a pressure receiving member that is disposed between the side frames, a connecting member that connects the pressure receiving member and the side frame, and at least the front of the pressure receiving member A vehicle seat that is configured such that the pressure-receiving member moves rearward when a predetermined rearward load or more is applied from the occupant to the seatback cushion.
The seat back cushion is
It has a central part that supports the upper body part of the occupant, and side parts that are provided continuously to the central part on both sides in the left-right direction of the central part, and at the boundary between the central part and the side parts. A front recess and a rear recess made of continuous or intermittent recesses are formed on both the front and rear surfaces along the corresponding portion,
The vehicle seat according to claim 1, wherein the rear concave portion is disposed on the inner side in the left-right direction of the front concave portion.   The vehicle seat according to claim 1, wherein a bottom portion of the rear concave portion is positioned in front of a bottom portion of the front concave portion. Further comprising a skin member covering the seat back cushion,
The skin member has an insertion portion that is inserted into the front concave portion, and the insertion portion is coupled to a bottom portion of the front concave portion,
3. The vehicle seat according to claim 1, wherein a bottom portion of the rear concave portion is positioned forward of a front end of the insertion portion. The seat back cushion is provided with a lining on the rear surface,
The vehicle seat according to any one of claims 1 to 3, wherein the lining is provided with a cut at a portion corresponding to a boundary between the central portion and the side portions. The connecting member is rotatably supported by the side frame, has a rotating member to which the pressure receiving member is connected, and an urging member that urges the rotating member,
The side frame has a stopper that protrudes inward in the left-right direction, and restricts the rotation range of the rotation member,
In order to prevent the seat back cushion from entering between the stopper and the rotating member, at least a part of the side frame extends inward in the left-right direction corresponding to the stopper. The vehicle seat according to any one of claims 1 to 4.

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