JP5724815B2 - Resin seat backboard and vehicle seat - Google Patents

Description

  The present invention relates to a resin seat backboard and a vehicle seat using the same.

  Patent Document 1 listed below discloses that a spring that is stretched between a pair of left and right side frames provided on a seat back frame is made of resin from the viewpoint of reducing the weight of a vehicle seat.

JP 2004-138156 A

  By the way, since the vehicle seat is composed of a large number of parts, there is room for improvement in order to reduce the number of parts assembly steps.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a resin seat back board and a vehicle seat that can reduce the number of steps for assembling parts to the seat back frame.

The resin seat backboard according to the first aspect of the present invention is disposed on the back surface of the seatback, and includes a board main body and a front extending portion extending from the both ends of the board main body in the seat width direction to the seat front side. a backboard portion you, the front-rear direction of the left and right extending the supported portion of the left and right are respectively supported on the front side of the left and right side frames of the seat back frame, the seat width direction inside end portions of the left and right supported portions to seat rear The left and right width direction extending portions that extend inward in the sheet width direction from the rear ends of the left and right front-rear direction extending portions and the inner ends of the sheet width direction are connected to the front ends of the front extending portions. A pair of left and right frame mounting portions and a seat width direction on the front side of the seat with respect to the left and right width direction extending portions, and both ends in the seat width direction are connected to the left and right front and rear direction extending portions. Slack portion is formed in the sheet width direction central side of the width direction extending portion of the right and left, corrugated by continuously a plurality of curved surfaces in the sheet width direction when the slack portion is viewed in plane cross section And a resin spring portion that can be bent and deformed rearward of the seat.

  In the resin seat backboard according to claim 1, since the resin spring portion and the backboard portion are integrally or integrally configured, compared to the case where the resin spring portion and the backboard portion are separate. The number of steps for assembling the parts to the seat back frame can be reduced. In addition, the left and right frame attachment portions connecting the resin spring portion and the backboard portion have left and right supported portions that are respectively supported on the front sides of the left and right side frames in the seat back frame. For this reason, when a load from the occupant is input to the resin spring portion, the left and right supported portions (frame mounting portions) can be favorably supported by the reaction force from the left and right side frames.

  In addition, the left and right frame mounting portions are arranged in the seat width direction from the rear ends of the left and right front-rear extending portions and from the rear ends of the left and right front-rear extending portions. And a width direction extending portion connected to both ends of the back board portion in the sheet width direction, and a seat of the resin spring portion disposed on the front side of the seat with respect to the left and right width direction extending portions Both end portions in the width direction are connected to left and right front-rear direction extending portions. Thus, since the front-rear direction extending portion extends from the supported portion supported on the front side of the side frame to the rear of the seat and is along the front-rear direction of the seat, the front-rear direction extending portion and the resin spring portion The connecting portion can be set at a position close to the side frame. Thereby, the length dimension along the sheet | seat width direction in the resin spring part can be lengthened. As a result, the amount of bending of the resin spring portion at the time of load input from the occupant can be increased, so that the comfort of the occupant can be improved.

  In addition, “extending to the rear of the seat” according to claim 1 does not need to extend strictly to the rear of the seat, and even when the longitudinally extending portion is slightly inclined with respect to the rear of the seat (front and rear direction of the seat). As long as the effects as described above can be obtained.

Further, in this resin sheet backboard, seat width direction inside end portion in the width direction extending portion provided in the frame mounting section extends from the seat width direction both end portions in the board itself backboard portion to the seat front side It is connected to the front end of the front extension. Thereby, since the distance between the resin spring portion disposed on the front side of the seat and the board body can be set larger than the extending portion in the width direction, the resin spring portion bends toward the rear side (board body side) of the seat. It is suitable when the amount is large.

Furthermore, in this resin sheet backboard, the resin spring portion arranged in the seat front side than the width direction extending portion of the left and right, a plurality of curved surfaces in the sheet width direction when viewed in plan sectional view A slack portion formed in a wave shape by being continuous is provided. Since the slack portion is provided in the resin spring portion on the center side in the seat width direction with respect to the left and right width direction extending portions, when the resin spring portion is bent toward the seat rear side, the slack portion is in the width direction. It is possible to prevent interference with the extension.

A resin seat backboard according to a second aspect of the present invention is the resin seat backboard according to the first aspect , wherein the front extension portion is a cover latch for latching a seat skin in the seat back. Part.

In the resin seat backboard according to the second aspect , the forward extending portions provided at both ends in the seat width direction of the board body in the backboard portion constitute the cover locking portion. For this reason, for example, when the storage pocket is set between the left and right cover engaging portions in the backboard portion, the width dimension of the storage pocket along the seat width direction can be set large.

According to a third aspect of the present invention, in the vehicle seat, the left and right side frames include a side wall portion and a front wall portion and a rear wall portion that extend inward in the seat width direction from the front end and the rear end of the side wall portion. A seat back frame, a seat back pad supported by the seat back frame, a seat skin covering the surface of the seat back pad, and the supported portion is opposed to the front surface of the front wall portion, and the front-rear direction The pair of left and right frame attachment portions are attached to the left and right side frames in a state where the extension portion faces the inner side surface in the seat width direction of the side wall portion, and the width direction extension portion faces the front surface of the rear wall portion. And the resin seat backboard according to claim 1 .

In the vehicle seat according to the third aspect , the seat back frame is supported by the seat back pad covered with the seat skin, and the resin seat back board is attached. Since this resin seat back board is the one described in claim 1 or claim 2 , the above-mentioned effects can be obtained.
According to a fourth aspect of the present invention, there is provided a vehicle seat including left and right side frames having side walls and front and rear wall portions that extend inward in the seat width direction from front and rear ends of the side walls. A seat back frame, a seat back pad supported by the seat back frame, a seat skin covering the surface of the seat back pad, and a resin seat back board attached to the left and right side frames. The resin seat backboard includes a backboard portion disposed on a back surface of the seatback, left and right supported portions respectively supported on front sides of the left and right side frames in the seatback frame, and the left and right supported portions. Left and right front-rear extending parts extending from the inner end of the seat width direction to the rear of the seat, and a rear end of the left and right front-rear extending parts A pair of left and right frame mounting portions that extend inward in the width direction and are connected to both ends in the seat width direction of the backboard portion, and the front side of the seat with respect to the left and right width direction extending portions A resin spring portion that extends in the seat width direction on the side, and that both end portions in the seat width direction are connected to the left and right front-rear direction extending portions and can be bent and deformed to the rear side of the seat. The supported portion faces the front surface of the front wall portion, the front-rear direction extending portion faces the inner surface of the side wall portion in the seat width direction, and the width direction extending portion is the front surface of the rear wall portion. The pair of left and right frame attachment portions are attached to the left and right side frames.

The vehicle seat according to claim 5 is the vehicle seat according to claim 3 or 4 , wherein the front wall portion has a shorter extension length from the side wall portion than the rear wall portion. Is set.

In the vehicle seat according to claim 5 , in the side frame of the seat back frame, the front wall portion extends longer than the rear wall portion from the side wall portion (projecting inward in the seat width direction from the side wall portion). Amount) is set short. Thereby, the front-rear direction extending portion extending from the inner end portion in the seat width direction of the supported portion supported on the front side of the side frame to the rear side of the seat can be disposed more outward in the seat width direction. The length dimension can be set longer.

  As described above, in the resin seat back board and the vehicle seat according to the present invention, the number of steps for assembling the components to the seat back frame can be reduced.

It is a disassembled perspective view of the seat back of the vehicle seat which concerns on embodiment of this invention. It is a perspective view which shows the state by which the seat back board was attached to the seat back frame shown by FIG. FIG. 3 is a cross-sectional plan view showing a cut surface along line 3-3 in FIG. 2.

  Hereinafter, the resin seat backboard 20 and the vehicle seat 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. In these drawings, an arrow FR appropriately shown indicates the front of the vehicle, an arrow UP indicates the upper side of the vehicle, and an arrow IN indicates the inner side in the vehicle width direction.

<Overall configuration>
FIG. 1 is an exploded perspective view of a seat back 12 corresponding to the backrest of the vehicle seat 10 according to the present embodiment. In FIG. 1, the angle at which each component is viewed is slightly changed. The vehicle seat 10 includes a seat cushion (not shown) on which an occupant sits, and a seat back 12 is tiltably connected to a rear end portion of the seat cushion.

  As shown in FIG. 1, the seat back 12 includes a metal seat back frame 14 as a skeleton member, a seat back pad 16 supported by the seat back frame 14, and a seat covering the seat back pad 16. A skin 18 and a resin seat back board 20 (hereinafter simply referred to as “seat back board 20”) attached to the seat back frame 14 are provided. Hereinafter, each component will be described in detail.

<Configuration of the seat back frame 14>
As shown in FIGS. 1 to 3, the seat back frame 14 is viewed from the front (when viewed from the front of the vehicle. Hereinafter, the direction of the vehicle, the direction of the vehicle seat 10, and the direction of the seat back 12 are It is assumed that they are the same). Specifically, a pair of left and right side frames 26 arranged to face each other in the seat back width direction (vehicle width direction), an inverted U-shaped upper frame 28 that connects the upper ends of the left and right side frames 26, and The lower frame 30 connects the lower ends of the left and right side frames 26 in the seat back width direction. The seat back 12 includes all four members including the upper frame 28 by press molding, but other frame structures may be adopted. For example, you may comprise with the pipe material which bent only the upper frame into the reverse U shape.

  As shown in FIG. 3, the side frame 26 includes a side wall portion 26A, a front wall portion 26B, and a rear wall portion 26C. It is formed in a shape. The width of the side wall portion 26A becomes narrower from the lower end side toward the upper end side as a whole. Also, as shown in FIG. 1, a plurality (two in this case) of mounting holes 32 are formed in the lower portion of the side wall portion 26A so as to be separated from each other in the vertical direction, and the mounting holes are formed in the upper portion of the rear wall portion 26C. 34 is formed. The side wall portion 26A extends along the front-rear direction of the seat, and the front wall portion 26B and the rear wall portion 26C extend inward in the seat width direction from the front end and the rear end of the side wall portion 26A. The front wall portion 26B is set to have a sufficiently shorter extension length from the side wall portion 26A than the rear wall portion 26C.

<Configuration of the seat back pad 16>
As shown in FIG. 1, the seat back pad 16 is made of a foam such as urethane foam, and includes a pad center portion 36 and a pair of left and right pad side portions 38. The pad center portion 36 is locked at the upper end side to the upper frame 28 of the seat back frame 14 from above the seat, and the lower end side is connected to a connecting rod (not shown) that connects the lower end portions of the side frames 26 in the seat width direction. It is locked from the side. The pad center portion 36 is supported from the seat rear side by the lower back spring portion 60 and the upper back spring portion 62 of the seat back board 20.

  As shown in FIG. 3, the pad side portion 38 has a substantially C-shaped cross section, and is mounted so as to be wound around the side frame 26. The pad side portion 38 bulges to the front side of the seat from the pad center portion 36, and has a shape that ensures side support for the occupant.

<Configuration of sheet skin 18>
As shown in FIG. 1, the seat skin 18 is formed in a size that can cover the seat back pad 16 from the front side. The seat cover 18 includes a cover center upper portion 40, a cover center lower portion 42, and a pair of left and right cover side portions 44. Between the cover center upper part 40 and the cover center lower part 42, a transverse mounting member 46 having a long cross-sectional shape along the sheet width direction is sewn. The lateral mounting member 46 is inserted into a lateral groove 48 formed in the seat back pad 16 and is locked to a lateral resin claw portion 62B (see FIG. 2) of the seat back board 20 described later. Further, between the cover center upper part 40 and the cover center lower part 42 and the left and right cover side parts 44, a longitudinal mounting member 50 having a long cross-sectional shape along the seat back height direction is sewn. Yes. These vertical mounting members 50 are inserted into a pair of left and right vertical grooves 52 formed in the seat back pad 16, and are locked to the vertical resin claws 64 </ b> C (see FIG. 2) of the seat back pad 16. Yes. Further, as shown in FIG. 3, an outer peripheral locking member 54 having a hook shape in cross section is attached to an appropriate position on the outer peripheral portion of the seat skin 18 by sewing. The outer peripheral locking member 54 is inserted and locked to the front extension 56B (cover locking portion) of the seat back board 20 from the rear side of the seat back. Thus, the seat skin 18 is attached to the seat back board 20.

<Configuration of the seat back board 20>
The seat back board 20 is formed of a resin material, and as shown in FIGS. 1 to 3, the back board portion 56 disposed on the back surface of the seat back 12 and the left and right sides of the seat back frame 14. A pair of left and right frame attachment portions 58 supported by the frame 26 and connected to the backboard portion 56, and disposed between the backboard portion 56 and the pair of left and right frame attachment portions 58. The lower back spring part 60 and the upper back spring part 62 disposed above the lower back spring part 60 and connected to the back board part 56 are integrally formed.

  The backboard portion 56 includes a board main body 56A formed slightly smaller than the seat back frame 14, and a forward extending portion 56B (cover locking portion) extending from the outer peripheral portion of the board main body 56A to the seat front side. Has been. The board main body 56A is formed in a substantially rectangular flat plate shape that is slightly smaller than the inner peripheral edge of the opening of the seat back frame 14 formed in a rectangular frame shape, and the thickness direction is along the front-rear direction of the seat back 12 It is arranged on the back of the seat back 12. The board main body 56A can pass through the inside of the seat back frame 14.

  The forward extending portions 56B are provided at the upper end portion and both end portions in the seat width direction of the outer peripheral portion of the board main body 56A, and are formed in an inverted U shape when viewed from the front-rear direction of the seat. The front extending portion 56B has a U-shaped cross section with the seat back rear side open. The front extending portion 56B is used as a cover locking portion for locking the outer peripheral locking member 54 attached to the outer peripheral portion of the seat skin 18 as described above, but reinforces the plate-like board body 56A. In addition, it has a function of increasing the surface rigidity of the entire backboard portion 56.

  On the other hand, the left and right frame mounting portions 58 are supported by the left and right supported portions 58A supported on the front sides of the left and right side frames 26, and the left and right fixed portions extending from the outer ends in the seat width direction of the left and right supported portions 58A. 58B, a longitudinally extending portion 58C extending rearward from the seat width direction inner end of the left and right supported portions 58A, and a left and right extending inwardly of the seat width direction from the rear ends of the left and right frontwardly extending portions 58C. The width direction extending portion 58D.

  As shown in FIG. 3, the supported portion 58 </ b> A faces the front wall portion 26 </ b> B of the side frame 26 from the front side of the seat, and the fixed portion 58 </ b> B seats with respect to the side wall portion 26 </ b> A of the side frame 26. It faces (abuts) from the outside in the width direction. A through hole 60 (see FIG. 1) is formed in the fixing portion 58B, and a resin clip 62 (see FIG. 2) inserted through the through hole 60 is fitted and locked into the mounting hole 32 of the side wall portion 26A. ing. Thereby, the fixing portion 58 </ b> B (frame attachment portion 58) is fixed to the side frame 26. As a fixing means for fixing the frame mounting portion 58 to the side frame 26, a structure in which a resin clip (fixing tool) is integrally formed in the fixing portion 58B and fitted into the mounting hole 32, or a rivet, screw, screw or bolt is used. Various configurations such as a configuration of fastening with a fastener such as a weld nut, a configuration of bonding with a structural adhesive, and the like are applicable.

  The front-rear direction extending portion 58C extends from the vicinity of the inner end portion in the seat width direction of the front wall portion 26B of the side frame 26 to the rear of the seat, and faces the side wall portion 26A of the side frame 26 from the inner side in the seat width direction. ing. The longitudinally extending portion 58C is disposed slightly outside the central portion in the seat width direction of the rear wall portion 26C of the side frame 26 and extends along the seat longitudinal direction. The rear end of the longitudinally extending portion 58C is disposed in the vicinity of the rear wall portion 26C of the side frame 26, and extends in the seat width direction from the rear end of the longitudinally extending portion 58C. The extending portion 58D is disposed to face the rear wall portion 26C from the front side of the seat. In the present embodiment, the side wall portion 26A is disposed in parallel with the front-rear direction extending portion 58C, and the rear wall portion 26C is disposed in parallel with the width direction extending portion 58D. The extending directions of 26A and the rear wall portion 26C can be changed as appropriate.

  The inner end portion in the seat width direction of the width direction extending portion 58D slightly protrudes inward in the seat width direction than the inner end portion in the seat width direction of the rear wall portion 26C, and is bent toward the rear of the seat. The front end of the front extension portion 56B of the backboard portion 56 described above is connected to the inner end portion of the width direction extension portion 58D in the seat width direction, and the front extension portion 56B is connected to the inner side in the seat width direction of the rear wall portion 26C. It is arranged close to the end. The front extending portion 56B extends rearward of the seat from the rear wall portion 26C, and the board main body 56A connected to the rear end of the front extending portion 56B is disposed on the rear side of the seat from the rear wall portion 26C. .

  In the frame mounting portion 58 having the above-described configuration, an open cross-sectional shape opened to the seat rear side is formed by the fixing portion 58B, the supported portion 58A, and the front-rear direction extending portion 58C, and the side frame 26 is formed inside the open cross-sectional shape. Are mated. When the seat back board 20 is assembled to the seat back frame 14, the seat back board 20 is attached to the seat back frame 14 from the front side of the seat. At this time, the backboard portion 56 is disposed on the back side of the seatback frame 14 through the inside of the seatback frame 14, and the open cross-sectional shape portions of the left and right frame attachment portions 58 are fitted to the front sides of the left and right side frames 26. Combined.

  On the other hand, the lower back spring portion 60 is constituted by three back spring main body portions 64 (all of which are resin spring portions) arranged in parallel in three upper and lower stages in the seat back height direction. These back spring main body portions 64 are formed in a long plate shape as a whole, and are arranged in a state where the thickness direction is along the front-rear direction of the seat, and the seat is located on the front side of the seat with respect to the left and right width direction extending portions 58D. It extends in the width direction. These back spring main body portions 64 are disposed on the seat rear side of the front-rear direction center portion of the front-rear direction extending portion 58C, and both longitudinal end portions thereof are integrated with the front-rear direction intermediate portion of the left and right front-rear direction extension portions 58C. (Refer to the connection part 68 of FIG. 3). Thereby, the three back spring main body parts 64 are connected in the seat back height direction by the left and right frame attaching parts 58. It should be noted that the number of the back spring body portions 64 that constitute the lower back spring portion 60 is arbitrary, and can be changed as appropriate in relation to the required cushion performance. Therefore, the upper and lower widths of the lower back spring main body portion may be widened to one, or conversely, two or four or more.

  A slack portion 64 </ b> A is formed on the center side in the longitudinal direction of the back spring body 64 (sheet width direction center side). The slack portion 64A is formed in a wave shape by continuing a plurality of curved surfaces in the seat back width direction when viewed in a plan view shown in FIG. The slack portion 64A is provided on the center side in the seat width direction with respect to the left and right width direction extending portions 58D, and the seat spring direction both ends of the back spring main body portion 64, that is, the seat front direction with respect to the width direction extending portion 58D. A portion facing from the side is a flat plate portion 64B. The wavy portion in the slack portion 64A swells to the rear side of the seat from the flat plate portion 64B. The back spring body portion 64 is elastically extended by the slack portion 64A when a load is applied to the backboard portion 56 side (seat rear side), whereby the back spring body portion 64 is bent and deformed toward the backboard portion 56 side which is the load acting direction. (Elastic deformation).

  Further, the back spring main body 64 is disposed at a position spaced apart from the board main body 56A of the back board 56 by a predetermined distance on the front side of the seat, and is bent and deformed within a range of a gap 70 formed therebetween. It is possible. That is, the backboard portion 56 also functions as a limiting member that limits the amount of deflection of the back spring body portion 64 to a predetermined amount or less. Further, a gap 72 having a sufficient interval for allowing the back spring main body 64 to bend is formed between the flat plate portion 64B and the width direction extending portion 58D, and the back spring main body is within the range of the gap 70. When the portion 64 is bent and deformed, the flat plate portion 64B is configured not to interfere with the width direction extending portion 58D.

  Note that longitudinal resin claws 64 </ b> C for engaging the longitudinal mounting member 50 described above are formed at both ends in the sheet width direction of the slack portion 64 </ b> A of each back spring main body 64. These vertically oriented resin claws 64C protrude from the back spring main body 64 to the front side of the seat, and are displaced (offset) from the forward extension portion 56B of the backboard portion 56 inward in the seat width direction. Yes. In addition, the slack portion 64A of each back spring main body portion 64 can be removed from the slide die in one of the seat back height directions (here, the lower side) when resin molding is performed using a slide die (not shown). A draft angle (tapered shape) is set.

  On the other hand, the upper back spring portion 62 is provided at a position separated from the lower back spring portion 60 by a predetermined distance in the seat back height direction. The upper back spring portion 62 has basically the same configuration as the above-described back spring main body portion 64, and includes a slack portion 62A similar to the slack portion 64A described above. However, through holes 74 (see FIG. 1) are formed at both ends in the longitudinal direction of the upper back spring portion 62, and a resin clip 76 (see FIG. 2) inserted through the through holes 74 is an attachment hole of the side frame 26. 34 (see FIG. 1). Thereby, the upper back spring part 62 is fixed to the side frame 26. In addition, at both ends in the sheet width direction of the slack portion 64A of the upper back spring portion 62, a vertical resin claw portion 62C similar to the above-described vertical resin claw portion 64C is provided, and the center of the slack portion 64A in the sheet width direction is provided. On the side, a plurality (three in this case) of lateral resin claw portions 62B for locking the lateral mounting member 46 described above are provided side by side in the sheet width direction.

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

  In the vehicle seat 10 having the above-described configuration, the lower back spring portion 60 and the upper back spring portion 62 and the back board portion 56 of the seat back board 20 are integrally or integrally configured. Therefore, the number of steps for assembling the parts to the seat back frame 14 can be reduced as compared with the case where each of the above parts is a separate body.

  Further, in the seat back board 20, the left and right frame attachment portions 58, which connect the lower back spring portion 60 and the back board portion 56, are supported on the left and right covers supported on the front side of the left and right side frames 26 in the seat back frame 14. It has a support portion 58A. For this reason, when a load from the occupant is input to the back spring main body 64 of the lower back spring 60, the left and right supported portions 58A (frame mounting portions 58) are improved by the reaction force from the left and right side frames 26. Can be supported.

  Moreover, the left and right frame attachment portions 58 are formed from left and right front-rear extending portions 58C extending rearward from the seat width direction inner ends of the left and right supported portions 58A, and from the rear ends of the left and right front-rear extending portions 58C. A width direction extending portion 58D that extends inward in the seat width direction and is connected to both end portions of the back board portion 56 in the seat width direction, and is disposed on the front side of the seat with respect to the left and right width direction extending portions. Both ends of the back spring body 64 in the seat width direction are connected to the left and right front-rear extending portions 58C.

  Thus, since the front-rear direction extending portion 58C extends from the supported portion 58A supported on the front side of the side frame 26 to the rear of the seat and is along the seat front-rear direction, the front-rear direction extending portion 58C and the back spring are provided. The connecting portion 68 with the main body portion 64 can be set at a position close to the side frame. Thereby, the length dimension L along the sheet width direction in the back spring main body 64 can be increased. As a result, the amount of deflection of the back spring body 64 when a load is input from the occupant can be increased, so that the comfort of the occupant can be improved.

  Note that the amount of deflection of the back spring body 64 can also be increased by reducing the thickness and width dimensions of the back spring body 64 (reducing the cross-sectional area of the back spring body 64). Sometimes the stress generated in the back spring body 64 increases. In this regard, in this embodiment, since the length dimension L of the back spring body 64 is increased, the amount of deflection of the back spring body 64 can be increased without reducing the cross-sectional area of the back spring body 64. Is preferable.

  Further, in the present embodiment, the side frame 26 of the seat back frame 14 is such that the front wall portion 26B extends from the side wall portion 26A to the inner side in the seat width direction from the side wall portion 26A than the rear wall portion 26C. Is set to be short. As a result, the longitudinally extending portion 58C extending rearward from the seat width direction inner end portion of the supported portion 58A supported on the front side of the side frame 26 can be disposed more outward in the seat width direction, so that the back spring The length dimension L of the main body 64 can be set longer.

  In addition, since the left and right front-rear extending portions 58C are along the seat front-rear direction, the left and right front-rear extending portions are retracted when the occupant sinks into the seat back 12 due to an impact force at the time of rear-end collision of the vehicle. It is possible to prevent or suppress 58C from interfering. Thereby, since it becomes possible to hit a passenger | crew's head to a headrest early, a whiplash reduction effect can be improved.

  Further, in the present embodiment, the inner end portion in the seat width direction of the extending portion 58D in the width direction provided in the frame attachment portion 58 extends from the both ends in the seat width direction in the board body 56A of the backboard portion 56 to the front side of the seat. It is connected to the front end of the front extension 56B. Thereby, since the distance between the back spring main body portion 64 and the board main body 56A disposed on the front side of the seat with respect to the width direction extending portion 58D can be set larger, the back side of the seat (board This is suitable when the amount of deflection of the back spring main body 64 toward the main body 56A side is large.

  In the present embodiment, the wavy slack portion 64A formed in the back spring body portion 64 is provided on the center side in the seat width direction with respect to the left and right width direction extending portions 58D, and the seat width of the back spring body portion 64 is A gap 72 is formed between the flat plate portion 64 </ b> B and the width direction extending portion 58 </ b> D provided at both ends in the direction, with a sufficient interval for allowing the back spring body portion 64 to bend. Thereby, when the back spring main body part 64 bends to the back side of the seat, the slack part 64A can be prevented from interfering with the width direction extending part 58D.

  In the present embodiment, the front extending portions 56B provided at both ends of the board body 56A in the seat width direction of the backboard portion 56 constitute a cover locking portion. For this reason, for example, when the storage pocket is set between the left and right cover engaging portions in the backboard portion 56, that is, in the portion exposed to the rear side of the seat in the backboard portion 56, the width of the storage pocket along the seat width direction. The dimensions can be set large.

<Supplementary explanation of the embodiment>
In the above embodiment, the frame mounting portion 58 is provided with the fixing portion 58B. However, the invention according to claims 1 to 5 is not limited thereto, and the fixing portion 58B is omitted, and the supported portion 58A is clipped. It may be configured to be fixed to the front wall portion 26B of the side frame 26 by, for example.

Moreover, in the said embodiment, it was set as the structure by which the sheet | seat skin 18 is latched by the front extension part 56B of the backboard part 56, However, The invention which concerns on Claim 1 and Claim 4 is not restricted to this, In a backboard part You may make it the structure by which a sheet | seat outer skin is latched by parts other than a front extension part.

In the above embodiment, the Bakkubane body portion 64 has a configuration in which wavy slack portion 64A in the sheet width direction central side from left and right in the width direction extending portion 58D is formed, according to claim 4 invention However, the configuration of the resin spring portion can be changed as appropriate.

Moreover, in the said embodiment, the backboard part 56 is provided with the board main body 56A and the front extension part 56B, and the front end of the front extension part 56B is connected with the sheet | seat width direction inner side edge part of the width direction extension part 58D. However, the invention according to claim 4 is not limited to this, and the configuration of the backboard portion can be changed as appropriate.

Furthermore, in the above embodiment, the backboard portion 56, the left and right frame mounting portions 58, the lower back spring portion 60 (back spring main body portion 64), and the upper back spring portion 62 are integrally formed. The invention according to claims 1 to 5 is not limited to this, and each of these parts may be separately molded and integrated by welding or the like.

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

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat back 14 Seat back frame 16 Seat back pad 18 Seat skin 20 Resin seat back board 26 Side frame 26A Side wall part 26B Front wall part 26C Rear wall part 56 Back board part 56A Board main body 56B Front extension part 58 Frame mounting portion 58A Supported portion 58C Front-rear direction extending portion 58D Width direction extending portion 64 Back spring main body portion (resin spring portion)
64A Loose section

Claims (5)

Disposed on the back of the seat back, and the board itself, and the backboard portion that having a, a distal portion before extending from the seat width direction end portions of the board body to the seat front side,
Left and right supported portions supported respectively on the front sides of the left and right side frames in the seat back frame, left and right front-rear direction extending portions extending rearward from the seat width direction inner end of the left and right supported portions, and A pair of left and right frame mounting portions having left and right width direction extending portions that extend inward in the seat width direction from the rear ends of the left and right front and rear direction extending portions and the sheet width direction inner end portion is connected to the front end of the front extending portion. When,
The sheet extends in the seat width direction on the front side of the sheet with respect to the left and right width direction extending portions, and both ends in the sheet width direction are connected to the left and right front and rear direction extending portions, and the left and right width direction extending portions Also, a slack portion is formed at the center side in the seat width direction, and when the slack portion is viewed in a plan view, it is formed in a wave shape by continuing a plurality of curved surfaces in the seat width direction and is bent toward the back side of the seat A resin spring portion that can be deformed;
A resin seat backboard with or without.   The resin seat backboard according to claim 1, wherein the front extending portion constitutes a cover locking portion for locking a seat skin in the seatback. A seat back frame in which the left and right side frames have a side wall portion and a front wall portion and a rear wall portion extending inward in the seat width direction from the front end and the rear end of the side wall portion;
A seat back pad supported by the seat back frame;
A sheet skin covering the surface of the seat back pad;
The supported portion faces the front surface of the front wall portion, the front-rear direction extending portion faces the inner side surface in the seat width direction of the side wall portion, and the width direction extending portion faces the front surface of the rear wall portion. The resin-made seat backboard according to claim 1 or 2, wherein the pair of left and right frame attachment portions are attached to the left and right side frames,
Vehicle seat equipped with A seat back frame in which the left and right side frames have a side wall portion and a front wall portion and a rear wall portion extending inward in the seat width direction from the front end and the rear end of the side wall portion;
A seat back pad supported by the seat back frame;
A sheet skin covering the surface of the seat back pad;
A resin seat backboard attached to the left and right side frames;
With
The resin seat backboard is:
A backboard portion disposed on the back of the seat back;
Left and right supported portions supported respectively on the front sides of the left and right side frames in the seat back frame, left and right front-rear direction extending portions extending rearward from the seat width direction inner end of the left and right supported portions, and A pair of left and right frame mounting portions having left and right width extending portions that extend inward in the seat width direction from the rear ends of the left and right front and rear extending portions and are connected to both ends of the back board portion in the seat width direction;
While extending in the seat width direction on the front side of the seat with respect to the left and right width direction extending portions, both end portions in the seat width direction are connected to the left and right front and rear direction extending portions and can be bent and deformed rearward of the seat. Resin spring part,
Or integrally provided,
The supported portion faces the front surface of the front wall portion, the front-rear direction extending portion faces the inner side surface in the seat width direction of the side wall portion, and the width direction extending portion faces the front surface of the rear wall portion. The vehicle seat in which the pair of left and right frame attachment portions are attached to the left and right side frames. The vehicle seat according to claim 3 or 4, wherein an extension length of the front wall portion from the side wall portion is set shorter than that of the rear wall portion.

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