JP2012106578A - Seat back board, and seat for vehicle using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a burden on the cervix of an occupant at the time of collision from behind.SOLUTION: A pair of right and left head rest support parts 92 are installed on an upper end part 36A of a back board part 36 of a resin seat back board 16. Each head rest support pump part 92 is rectangularly formed and an end part 90A of a head rest stay 90 is inserted. Accordingly, when the head rest stay 90 is about to rotate forward at the time of collision from behind, its end part 90A obtains a reactive force from a front wall part 92A of the head rest stay support part 92 and rotation of a head rest 84 is suppressed.

Description

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

  Patent Document 1 below discloses an example of a headrest support. Briefly, a pair of left and right square tube type support brackets are fixed to the upper frame portion of the seat back frame by welding or the like. By inserting a pair of left and right headrest stays into the pair of left and right support brackets, the headrest is assembled to the seat back frame.

JP 2009-125398 A

  However, at the time of a rear collision (hereinafter simply referred to as “rear collision”), when the head of the occupant is pressed against the headrest and a load on the rear side of the vehicle is input to the headrest, the upper frame portion of the seat back frame is As a center, a moment is generated in the direction in which the headrest rotates to the rear side of the vehicle. Since the headrest body and the headrest stay are only supported by the upper frame portion via the support bracket, it is difficult to suppress the generation of the moment at the time of a rear collision. Therefore, the prior art has room for improvement in this respect.

  In view of the above facts, an object of the present invention is to obtain a seat back board that can reduce the load on the occupant's neck during a rear-end collision and a vehicle seat using the seat back board.

  The seat backboard according to the first aspect of the present invention is formed integrally with or integrally with a backboard portion that is formed of a resin plate material and is disposed on the back side of the seatback frame, and an upper end portion of the backboard portion. And a headrest stay support portion that supports a headrest stay that extends in the headrest height direction from the lower surface of the headrest body that supports the occupant's head.

  According to a second aspect of the present invention, there is provided the seat backboard according to the first aspect, wherein the headrest stay support portion includes at least a wall disposed on the front side of the headrest stay. It is a feature.

  According to a third aspect of the present invention, the seat backboard according to the first or second aspect of the present invention is arranged along a seat width direction between a pair of left and right side frames provided in the seat back frame, and It is provided with a resin-made back spring main body that is integrally or integrally provided with the backboard portion and is bent and deformed in the load acting direction when a load to the seat back rear side acts.

  According to a fourth aspect of the present invention, there is provided a seat backboard according to the third aspect of the present invention, wherein when viewed from the back side of the backboard portion, the upper portion of the backboard portion expands toward the front side of the seatback. The seat back board according to any one of claims 1 to 3, wherein a bent portion having a curved shape is provided.

  A vehicle seat according to a fifth aspect of the present invention is a seat back frame comprising a pair of left and right side frames and an upper frame connecting the upper end portions of these side frames in the seat width direction. A headrest body that supports the head of the occupant, a headrest including a headrest stay that extends from the lower surface of the headrest body in the headrest height direction and penetrates the upper frame, the backboard portion, and the headrest stay support portion The seat back board according to any one of claims 1 to 4, wherein a portion of the headrest stay that protrudes downward from the upper frame is supported by the headrest stay support portion. ing.

The effect | action of this invention of Claim 1 is as follows.
When the rear impact occurs, the upper body of the occupant is pressed against the seat back. For this reason, the load to the back side of the seat back is input to the backboard portion.

  On the other hand, when the rear collision occurs, the passenger's head is pressed against the headrest body. For this reason, the headrest stay extended from the lower surface of the headrest body tends to rotate to the front side of the seatback with the support portion for the seatback frame as the center of rotation. Hereinafter, in the present specification, the rotation of the headrest stay to the front side of the seatback with the support portion for the seatback frame as the center of rotation is sometimes simply referred to as “the rotation of the headrest stay to the front side of the seatback”.

  Here, in the present invention, the headrest stay support portion is integrally or integrally provided at the upper end portion of the backboard portion, and the headrest stay is supported by the headrest stay support portion. For this reason, rotation of the headrest stay to the front side of the seat back is suppressed.

  According to the second aspect of the present invention, since the headrest stay support part includes the wall disposed at least on the front side of the seatback of the headrest stay, when the head of the occupant presses the headrest body, the headrest stay To the front side of the seat back. As a result, a reaction force in the direction opposite to the rotational force toward the seat back front acts on the headrest stay. That is, a rotational moment acting in a direction to cancel the rotational moment acting on the headrest stay acts.

  According to the third aspect of the present invention, when the occupant's chest is pressed against the seat back at the time of a rear collision, the resin-made back spring main body is bent and deformed in the load acting direction and comes into contact with the back board (bottoms). As described above, the headrest stay support part is integrally or integrally provided at the upper end part of the backboard part, so that the headrest stay support is supported from the time when the back spring body part comes into contact with the backboard part. Rotation of the headrest stay to the front side of the seat back by the portion starts to be suppressed.

  According to the fourth aspect of the present invention, the backboard portion is provided with the curled portion that bulges toward the front side of the seat back and has a curled shape when viewed from the back surface side, so that the backboard portion has no curled portion. Compared to the case, the distance between the seat back and the backboard portion is shortened. For this reason, the load input from the occupant's chest to the seat back at the time of a rear collision is transmitted to the back board portion quickly. Therefore, the headrest stay support part integrally or integrally provided on the backboard part can be quickly restrained.

  According to the fifth aspect of the present invention, the headrest stay has a portion protruding downward from the upper frame of the seat back frame, and the protruding portion is provided integrally or integrally with the upper end portion of the backboard portion. Supported by the headrest stay support section. Therefore, the action of the present invention according to claim 1 can be obtained in the vehicle seat.

  As described above, the seat backboard according to the first aspect of the present invention has an excellent effect that the load on the occupant's neck can be reduced at the time of a rear collision.

  The seat back board according to the second aspect of the present invention has an excellent effect that the rotation of the headrest stay toward the front side of the seat back can be suppressed with a simple configuration.

  The seat backboard according to the third aspect of the present invention is excellent in that the timing of contact (with bottom) of the back spring body portion to the backboard portion can be adjusted by setting the spring constant of the back spring body portion. Has an effect.

  The seat backboard according to the fourth aspect of the present invention has an excellent effect that it is possible to improve the responsiveness until the rotation of the headrest stay to the front side of the seat back is suppressed at the time of a rear collision.

  The vehicle seat according to the fifth aspect of the present invention has an excellent effect of being able to reduce the load on the occupant's neck at the time of a rear collision.

It is a disassembled perspective view of the seat back of the vehicle seat which concerns on 1st Embodiment. It is a perspective view which shows the state by which the resin spring integrated backboard was assembled | attached to the seat back frame shown by FIG. FIG. 3 is an enlarged plan cross-sectional view showing a state in which the seatback is assembled along a line 3-3 in FIG. 2. FIG. 2 is an enlarged longitudinal sectional view showing an assembled state of the seat back shown in FIG. 1. It is a perspective view which expands and shows the seat back board shown by FIG. It is an expanded vertical sectional view which expands and shows the upper part of the vehicle seat. FIG. 7 is an enlarged longitudinal sectional view corresponding to FIG. 6 for explaining the operation and effect of the first embodiment. It is a perspective view corresponding to Drawing 5 which expands and shows the seat back board concerning a 2nd embodiment. FIG. 9 is an enlarged longitudinal sectional view showing an upper part of a vehicle seat provided with the seat back board shown in FIG. 8 in an enlarged manner.

[First Embodiment]
Hereinafter, a first embodiment of a seat backboard according to the present invention and a vehicle seat using the same will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

<Overall configuration>
FIG. 1 is an exploded perspective view of a seat back corresponding to the backrest of the vehicle seat according to the present embodiment. In FIG. 1, the angle at which each component is viewed is slightly changed. FIG. 3 is a plan sectional view of the seat back. Further, FIG. 4 shows a longitudinal sectional view of a vehicle seat provided with the seat back. As shown in these drawings, a vehicle seat 10 includes a seat cushion 11 (see FIG. 4) on which an occupant is seated, a seat back 12 that is tiltably supported at a rear end portion of the seat cushion 11, and a seat back. 12 and a headrest 84 supported by the upper end of 12 in a vertically movable manner.

  As shown in FIG. 1, the seat back 12 includes a metal seat back frame 14 that constitutes a skeleton member of the seat back 12, and a resin spring integrated back board (hereinafter referred to as a front plate) mounted on the front side of the seat back frame 14. , Simply referred to as “seat back board”) 16, a seat back pad 18 that constitutes a cushion material of the seat back 12 and is attached from the front side of the seat back board 16 and supported by the seat back frame 14, The back pad 18 mainly includes a cover (skin) 20 that covers the front surface, and a vertical mounting member 22 and a horizontal mounting member 24 for mounting the cover 20 to the seat back board 16. Hereinafter, each component will be described in detail.

<Configuration of the seat back frame 14>
As shown in FIGS. 1 to 4, the seat back frame 14 is viewed from the front (when viewed from the front of the vehicle. Hereinafter, the direction of the vehicle and the direction of the vehicle seat 10 are assumed to be the same. )) In the shape of a rectangular frame. Specifically, a pair of left and right side frames 26 arranged opposite to each other in the 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 left and right side frames 26 And a lower frame 30 that connects lower end portions in the vehicle 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, only the upper frame may be formed of a pipe material bent in an inverted U shape, or the upper frame and a pair of left and right side frames may be configured of a single pipe material bent in an inverted U shape.

  Next, the sectional structure of the left and right side frames 26 will be described. As shown in FIGS. 2 to 4, the side frame 26 includes a side wall portion 26 </ b> A, a front wall portion 26 </ b> B, and a rear wall portion 26 </ b> C. When viewed as a pair on the left and right, it is formed in an open cross-sectional shape with the inside facing the sheet width direction opened in a plan view. The width of the side wall portion 26A becomes narrower from the lower end portion toward the upper end portion as a whole. A plurality of mounting holes 32 (see FIG. 1) are formed in the lower portion of the side wall portion 26A so as to be spaced apart from each other in the vertical direction. The front wall portion 26B extends inward in the seat width direction from the front end of the side wall portion 26A, and the front end portion thereof is bent obliquely toward the vehicle rear side. The rear wall portion 26C extends inward in the seat width direction from the rear end of the side wall portion 26A in parallel to the front wall portion 26B, and the front end portion thereof is bent obliquely toward the front side of the vehicle. The width of the rear wall portion 26C is set sufficiently wider than the width of the front wall portion 26B. A mounting hole 34 (see FIG. 1) is also formed on the upper side of the rear wall portion 26C.

<Configuration of seat back board 16>
Next, the structure of the seat back board 16 which comprises the principal part of the vehicle seat 10 which concerns on this embodiment is demonstrated in detail. As shown in FIGS. 1 to 4 (particularly FIGS. 1 and 2), the seat back board 16 is formed of a resin plate and has a back board portion 36 disposed on the back side of the seat back frame 14. The resin is made of resin and is provided integrally with the backboard portion 36 and is supported so as to be directly supported by the pair of left and right side frames 26. Further, a load acting on the rear side of the seat back acts on the load acting direction ( And a back spring portion 38 formed to be able to bend and deform toward the vehicle rear side).

  The backboard portion 36 includes a board body 40 that is formed slightly smaller than the seatback frame 14, and a U-groove locking portion 42 that is integrally formed on the outer periphery of the board body 40. . More specifically, the board body 40 is formed slightly smaller than the inner peripheral edge of the opening of the seat back frame 14 formed in a rectangular frame shape. In the assembled state to the seat back frame 14, the board body 40 is disposed slightly on the vehicle rear side between the front end portions (inner end portions) of the rear wall portions 26 </ b> C of the left and right side frames 26. Therefore, the board main body 40 can be assembled from the vehicle front side of the seat back frame 14 (see FIG. 3). The cross-sectional shape of the locking portion 42 is U-shaped with the vehicle rear side open. The locking portion 42 is used to lock the outer peripheral portion of the cover 20 described later, and has a function of reinforcing the plate-like board body 40 and increasing the surface rigidity of the entire backboard portion 36. Yes.

  The back spring portion 38 includes a lower back spring portion 44 that is integrally formed on the lower side of the back board portion 36, and an upper back spring portion 46 that is integrally formed on the upper side of the back board portion 36. The upper back spring portion 46 is independently provided at a position separated from the lower back spring portion 44 by a predetermined distance in the seat back height direction.

  The lower back spring portion 44 includes three lower back spring main body portions 48 arranged in parallel in three upper and lower stages in the seat back height direction, and both end portions of these three lower back spring main body portions 48 in the seat width direction. Are connected to the backboard portion 36 and fixed to the side frame 26, and the lower connection fixing portion 50 is connected to the seat frame in the seat back height direction. It should be noted that the number of the lower back spring body portions 48 that constitute the lower back spring portion 44 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 portion may be widened to one, or conversely, two or four or more.

  The flat cross-sectional shape of the lower back spring main body portion 48 is formed in a wave shape, and a wave portion (flexible portion) 48A is extended by the action of a load on the backboard portion 36 side (vehicle rear side), whereby the load is increased. It is configured to bend and deform (elastically deform) toward the backboard portion 36 which is the direction of action. In addition, in the vicinity of both end portions 48B in the seat width direction of the lower back spring body portion 48 of the upper and middle stages, a vertically oriented resin claw portion 58 to be described later for attaching the cover 20 is integrally formed. For the range where the claw portion 58 is formed, the wave-like portion 48A is not formed.

  As shown in FIGS. 3 and 4, the above-described backboard portion 36 is disposed at a position separated by a predetermined distance on the vehicle rear side of the lower back spring portion 44. That is, a predetermined gap 52 is formed between the lower back spring portion 44 and the back board portion 36. The lower back spring body 48 can be elastically deformed within the gap 52. That is, the backboard portion 36 also functions as a limiting member that limits the amount of bending of the lower back spring portion 44 to a predetermined amount or less.

  As shown in FIG. 3, the lower connection fixing portion 50 is formed in a substantially inverted U shape in plan view, and is an inner side to which the end portion 48 </ b> B in the seat width direction of the lower back spring body portion 48 is connected. A side wall 50A, an outer side wall 50B disposed opposite to the inner side wall 50A in the sheet width direction and locked to the outer surface of the side wall portion 26A of the side frame 26 in a surface contact state, and a front end of the inner side wall 50A And a front wall 50C that connects the front end of the outer side wall 50B in the vehicle width direction and is locked to the front wall portion 26B of the side frame 26 in a surface contact state.

  Both end portions 48B in the seat width direction of the lower back spring body portion 48 in the upper and lower stages described above are configured as flat portions where the wave-like portions 48A are not formed, and are connected to each other by a pair of left and right lower connection fixing portions 50. Has been. In other words, the lower back spring main body 48 is provided in a plurality of stages in the seat back height direction, but both end portions 48B of the lower back spring main body 48 in the seat width direction are connected by the pair of left and right lower connection fixing portions 50. As a result, the lower back spring portion 44 is integrated with the back board portion 36. In addition, the longitudinal dimension of the lower connection fixing portion 50 is set so as to include a range from the upper edge of the uppermost lower back spring body portion 48 to the lower edge of the lowermost lower back spring body portion 48. Yes.

  The lower connection fixing portion 50 is fixed to the side frame 26 by fixing the outer side wall 50B from the outer side in the seat width direction by a fixing means (not shown) to the mounting hole 32 of the side wall portion 26A of the side frame 26. . As fixing means, a structure in which a resin clip is integrally formed on the outer side wall 50B and engaged with the mounting hole 32, a structure in which a rivet, a screw, a screw or a bolt and a fastener such as a weld nut are fastened, and a structure Various aspects, such as a structure of bonding with an adhesive, can be applied.

  The upper back spring portion 46 is basically configured in the same manner as the lower back spring portion 44. The upper back spring main body 54 and the left and right sides formed integrally with both end portions 54B of the upper back spring main body 54 in the seat width direction are also provided. And a pair of upper connection fixing portions 56. Of these, the upper back spring main body portion 54 is formed with wavy portions 54A at two locations on the left and right sides so as to expand and bend and deform (elastically deform) when a load is applied to the backboard portion 36 (vehicle rear side). Yes. The pair of left and right upper connecting and fixing portions 56 are set to have a longitudinal dimension that fits between the side wall portions 26 </ b> A of the left and right side frames 26 including the upper back spring main body portion 54. The pair of left and right upper connection fixing portions 56 are fixed to the mounting holes formed in the rear wall portion 26C from the front side of the seat back by fixing means (not shown), whereby the upper connection fixing portions 56 are fixed to the side frames 26. Yes. As the fixing means, a structure in which a resin clip is integrally formed on the upper connection fixing portion 56 and engaged with a mounting hole, a structure in which a rivet, a screw, a screw or a bolt and a fastener such as a weld nut are fastened, Various aspects such as a configuration in which the adhesive is used for the adhesive can be applied. Further, the longitudinal resin claws 58 are integrally formed at both ends 54B in the sheet width direction of the upper back spring main body 54, and the lateral resin claws 60 are formed at both ends 54B and the center in the sheet width direction. It is integrally formed.

  Further, in the present embodiment, the upper back spring portion 46 is configured by one stage (one), but is not limited thereto, and may be configured by a plurality of stages (a plurality of stages) such as two stages.

<Configuration of the seat back pad 18>
As shown in FIG. 1, the seat back pad 18 is roughly composed of a pad center upper part 62, a pad center lower part 64, and a pair of left and right pad side parts 66. The seat back pad 18 is made of urethane foam or the like.

  As shown in FIG. 4, the vertical cross-sectional shape of the pad center upper portion 62 is formed in a substantially J shape that is upside down and left and right. The pad center upper part 62 is locked to the upper frame 28 of the seat back frame 14 from above the seat back. The vertical cross-sectional shape of the pad center lower portion 64 is formed in a substantially J shape that is opposite to the left and right. The pad center lower part 64 has a shape in which the lower part swells in a convex curve shape from the upper part to the vehicle front side. The pad center lower portion 64 is locked from the lower side of the seat back to a connecting rod 68 that connects the lower ends of the side frames 26 in the seat width direction. The connecting rod 68 is disposed in parallel to the front side of the lower frame 30 of the seat back frame 14.

  Further, as shown in FIG. 3, the cross-sectional shape of the pad side portion 66 is formed in a substantially C shape. The pad side portion 66 is attached so as to be wound around the side frame 26 in a state where the lower connection fixing portion 50 is attached. The pad side portion 66 has a shape in which the lower portion bulges in a convex curved shape from the upper portion toward the front side of the vehicle, and bulges further toward the front side of the vehicle than the pad central upper portion 62 and the pad central lower portion 64. It has a shape that secures the side support performance.

  Returning to FIG. 4, the seat back board 16 described above is disposed from the back side lower end 62 </ b> A of the pad center upper part 62 to the back side upper end part 64 </ b> A of the pad center lower part 64 in the longitudinal sectional view. Precisely, the back side upper end portion 64A of the pad center lower portion 64 is formed thinner than the back side lower end portion 62A, and the lower end portion of the backboard portion 36 is disposed so as to overlap in the thinned portion. .

  Further, a lateral slit 70 as a through groove for hanging the cover is formed between the pad center upper part 62 and the pad center lower part 64 described above. Further, between the pad center upper part 62, the pad center lower part 64, and the pad side part 66, vertical slits 72 are formed as through grooves for hanging a pair of left and right covers. The slit width of the horizontal slit 70 and the vertical slit 72 is set to a length that allows the vertical mounting member 22 and the horizontal mounting member 24 to be described later to be inserted. Further, both the horizontal slit 70 and the vertical slit 72 are formed in a straight line, and penetrate the seat back pad 18 in the thickness direction (also in the vehicle front-rear direction).

<Configuration of cover 20>
As shown in FIG. 1, the cover 20 is formed in a size that can cover the seat back pad 18 from the front side. Further, the cover 20 includes a cover center upper portion 74, a cover center lower portion 76, and a pair of left and right cover side portions 78 in accordance with the divided configuration of the seat back pad 18.

<Mounting structure of cover 20>
The cover 20 is attached by means of a vertical mounting member 22, a horizontal mounting member 24, a vertical resin claw portion 58, a horizontal resin claw portion 60, an outer peripheral locking portion 80, and the like.

  As shown in FIG. 1, the vertical mounting member 22 includes a belt-shaped mounting member main body 22A, and a resin engaging portion formed on one side edge of the mounting member main body 22A and formed in a wedge shape. 22B. The other side edge of the attachment member main body 22A is attached in advance to the cover center upper portion 74, the cover center lower portion 76, and the cover side portion 78 by sewing. In FIG. 1, the vertical mounting member 22 (and the horizontal mounting member 24) is drawn separately from the cover 20, but the vertical mounting member 22 (and the horizontal mounting member 24) is attached to the cover 20 in advance. It has been. Correspondingly, longitudinal resin claws 58 are integrally formed on both outer sides of the back spring body 48 in the sheet width direction with respect to the corrugated portion 48A. The engaging portion 22 </ b> B of the vertical mounting member 22 can be elastically engaged with the vertical resin claw portion 58. Then, by engaging the engaging portions 22B of the pair of left and right vertical mounting members 22 with the corresponding vertical resin claws 58 of the respective back spring main body portions 48, the central portion of the cover 20 is seated in the vertical direction. Attached to the backboard 16.

  Similarly, the lateral mounting member 24 is configured by a mounting member main body 24A formed in a band shape, and a resin engaging portion 24B formed on one side edge of the mounting member main body 24A and formed in a wedge shape. Has been. The other side edge of the attachment member main body 24A is attached in advance to the cover center upper part 74 and the cover center lower part 76 by sewing. Correspondingly, the back spring main body portion 48 arranged at the uppermost stage is integrally formed with a lateral resin claw portion 60 at a central portion in the sheet width direction and at two locations on both outer sides. The engaging portion 24 </ b> B of the lateral mounting member 24 can be elastically engaged with the lateral resin claw portion 60. Then, as shown in FIG. 4, the engaging portions 24B of the lateral mounting members 24 provided at three locations are elastically engaged with the lateral resin claws 60 of the back spring main body portion 48 arranged at the uppermost stage. By doing so, the center portion of the cover 20 is attached to the seat back board 16 in the lateral direction.

  Further, an outer peripheral locking portion 80 having a hook shape is attached to an appropriate position of the outer peripheral portion of the cover 20 by sewing. The outer peripheral locking portion 80 is inserted and locked to the locking portion 42 of the backboard portion 36 from the vehicle rear side. Thereby, the outer peripheral part of the cover 20 is detachably locked to the backboard part 36.

<Main part configuration of this embodiment>
First, the structure around the headrest 84 will be described. As shown in FIG. 6, resin headrest supports 86 are respectively inserted into the left and right portions of the upper frame 28 in the seat back frame 14 described above. The headrest support 86 includes a base portion 86A disposed in contact with the upper surface portion 28A of the upper frame 28, and leg portions 86B extending from the base portion 86A in an elongated cylindrical shape. The leg portion 86B penetrates the cross section of the upper frame 28 substantially in the vehicle vertical direction and is supported by the upper surface portion 28A and the lower surface portion 28B.

  A headrest 84 is inserted into the above-described headrest support 86 from above the seat back. The headrest 84 includes a pillow-like headrest main body 88 that supports the head of the passenger, and a pair of left and right headrest stays 90 that extend from the lower surface of the headrest main body 88 to the vehicle lower side. The headrest stay 90 is made of metal and is formed in a pipe shape. The length of the headrest stay 90 (the length of the portion exposed from the lower surface of the headrest body 88) takes into account the stroke when adjusting the height of the headrest 84 when the headrest stay 90 is inserted into the headrest support 86. Thus, the length of the leading end 90 </ b> A of the headrest stay 90 is set so as not to penetrate the upper frame 28 and contact the locking portion 42 of the backboard portion 36.

  Further, the above-described backboard portion 36 extends along the seat width direction, and has an upper end portion 36A disposed in parallel to the upper frame 28 of the seatback frame 14 in the assembled state to the vehicle seat 10. I have. A pair of left and right headrest stay support portions 92 made of resin are erected on both sides of the upper end portion 36A. Each headrest stay support portion 92 is formed in a rectangular tube shape and is arranged coaxially with the headrest support 86. The lower end portion of the headrest stay support portion 92 is formed integrally with the upper end portion 36 </ b> A of the backboard portion 36. Further, a lower end portion of the headrest support 86 and a tip end portion 90A of the headrest stay 90 are inserted into the upper portion (portion from the upper end portion to the intermediate portion) of the headrest stay support portion 92. Accordingly, the front wall portion 92A of the resin headrest stay support portion 92 is disposed (in a close proximity) on the front side of the front end portion 90A of the headrest stay 90.

  Further, the upper portion of the backboard portion 36 is formed with a curled portion 94 that swells toward the front side of the seatback and has a shape that is curled when viewed from the back surface side of the backboard portion 36. As a result, the wall 94A forming the turn portion 94 protrudes toward the front side of the seat back, and the distance from the front surface of the back board portion 36 to the upper back spring portion 46 and the seat back pad 18 is shortened.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  The vehicle seat 10 having the above configuration includes the seat back board 16 in which a resin back spring part 38 is integrally formed with a resin back board part 36. Then, the seat back board 16 is fitted to the metal seat back frame 14 from the front side of the vehicle. Specifically, the left and right lower connection fixing portions 50 are fitted to the left and right side frames 26 from the front side of the vehicle, and are fixed to the side frames 26 from the outside in the seat width direction in this state. Further, the left and right upper connecting and fixing portions 56 are inserted into the left and right side frames 26 from the front side of the vehicle and then fixed to the left and right rear wall portions 26C from the front side of the vehicle. Thereafter, the seat back pad 18 is mounted on the seat back frame 14 from the front side of the vehicle, and the cover 20 is further put on the seat back pad 18. A vertical mounting member 22 and a horizontal mounting member 24 are fixed in advance to the cover 20 by sewing, and the vertical mounting member 22 and the horizontal mounting member 24 correspond to the vertical mounting member 22 while covering the seat back pad 18 with the cover 20. It inserts in the direction slit 72 and the horizontal direction slit 70, and is made to latch to the vertical resin claw part 58 and the horizontal resin claw part 60, respectively. Further, the outer peripheral locking portion 80 of the cover 20 is locked to the locking portion 42 of the backboard portion 36.

  A seat cushion 11 and a headrest 84 are attached to the seat back 12 assembled as described above to form the vehicle seat 10. When the occupant sits on the vehicle seat 10, a load on the rear side of the seat back is input to the back spring portion 38 via the cover 20 and the seat back pad 18. For this reason, the lower back spring main body 48 and the upper back spring main body 54 are bent and deformed to the rear side of the seat back, which is the load acting direction. Further, since the load at this time is transmitted to the left and right side frames 26 from the lower connection fixing portion 50 and the upper connection fixing portion 56, a reaction force from the side frame 26 to the vehicle front side is generated.

  Thus, when a load is input from the occupant to the back spring portion 38, the load is deformed and contributes to securing the cushioning property of the seat back 12, and the load itself is transmitted to the left and right side frames 26 to be transmitted to the left and right side frames. 26. As a result, the cushion performance of the seat back 12 is sufficiently ensured. Further, since the back spring portion 38 is made of resin and is provided integrally with the back board portion 36, the number of parts and the number of assembling steps are reduced as compared with the case where the back spring portion 38 is formed of a metal seat back spring. Is done.

  By the way, when the rear collision occurs, the upper body of the occupant is pressed against the seat back 12. For this reason, a load (see arrow A in FIG. 7) to the rear side of the seat back is input to the back spring portion 38, particularly the upper back spring portion 46, via the seat back pad 18. For this reason, the upper back spring main body portion 54 is bent and deformed to the rear side of the seat back, and is attached to the back board portion 36 of the seat back board 16.

  On the other hand, the passenger's head is pressed against the headrest body 88 of the headrest 84 (see arrow B in FIG. 7). For this reason, the headrest stay 90 extended from the lower surface of the headrest main body 88 will rotate to the front side of the seatback with the support portion of the seatback frame 26 to the upper frame 28 as the center of rotation (see arrow M in FIG. 7). And

  Here, in the seat backboard 16 and the vehicle seat 10 using the same according to the present embodiment, a pair of left and right headrest stay support portions 92 are integrally provided on the upper end portion 36A of the backboard portion 36, and these A head rest 90A is inserted into and supported by the head rest stay support 92. For this reason, the distal end portion 90 </ b> A of the headrest stay 90 is in a state of being restrained by the headrest stay support portion 92. For this reason, the front end portion 90 </ b> A of the headrest stay 90 receives a reaction force R from the front wall portion 92 </ b> A of the headrest stay support portion 92 toward the seat back rear side. As a result, the rotation of the headrest stay 90 toward the front side of the seat back (see arrow M in FIG. 7) is suppressed. As a result, according to the present embodiment, it is possible to reduce the load on the occupant's neck at the time of a rear collision.

  Further, in the present embodiment, the headrest stay support portion 92 includes at least the front wall portion 92A that is a wall disposed on the front side of the seat back in the headrest stay 90, so when the occupant head presses the headrest body 88, The headrest stay 90 presses the front wall portion 92A toward the seat back front side. As a result, a reaction force (see arrow R in FIG. 7) in the opposite direction acts on the headrest stay 90 in a direction opposite to the rotational force (see arrow M in FIG. 7) toward the seat back front side. That is, a rotational moment acting in a direction to cancel the rotational moment acting on the headrest stay 90 acts. Therefore, according to this embodiment, rotation of the headrest stay 90 toward the front side of the seat back can be suppressed with a simple configuration.

  Further, in the present embodiment, when the occupant's chest is pressed against the seat back 12 at the time of a rear collision, the resin-made upper back spring portion 46 is bent and deformed in the load acting direction and comes into contact with the back board portion 36 (bottoms). Since the headrest stay support portion 92 is integrally provided on the upper end portion 36A of the backboard portion 36 as described above, from the time when the upper back spring main body portion 54 abuts (becomes bottom) on the backboard portion 36, The headrest stay support portion 92 starts to restrain the headrest stay 90 from rotating forward in the seat back. Therefore, the timing of contact (with bottom) of the upper back spring body 54 to the back board 36 can be adjusted depending on the setting of the spring constant of the upper back spring body 54.

  Further, in the present embodiment, the backboard portion 36 is provided with the curled portion 94 that bulges toward the front side of the seat back and has a curled shape when viewed from the back side. Compared to the case, the distance between the upper back spring main body portion 54 and the back board portion 36 is shortened. The wall of the backboard portion 36 approaches the seat back front side. For this reason, the load input from the occupant's chest to the seat back 12 at the time of the rear collision is transmitted to the back board portion 36 quickly. Accordingly, the headrest stay support portion 92 provided integrally with the backboard portion 36 can be quickly restrained. As a result, according to this embodiment, it is possible to improve the responsiveness until the headrest stay 90 is prevented from rotating forward in the seat back at the time of a rear collision.

[Second Embodiment]
Hereinafter, a second embodiment of the seat backboard according to the present invention and a vehicle seat using the same will be described with reference to FIGS. 8 and 9. In addition, about the same component as 1st Embodiment mentioned above, the same number is attached | subjected and the description is abbreviate | omitted.

  The second embodiment is characterized in that a concave portion 98 is further formed so as to overlap the turned portion 94 of the backboard portion 36 in the seat backboard 16 described above. Specifically, by forming a concave portion 98 that is further recessed toward the front side of the seat back on the wall 94A that forms the turned portion 94, the bottom wall portion 98A of the concave portion 98 protrudes further toward the front side of the seat back. . Accordingly, the concave portion 98 also corresponds to the “turned portion” in the present invention.

(Action / Effect)
According to the above configuration, the bottom wall portion 98 </ b> A of the concave portion 98 is disposed closer to the back surface side of the seat back pad 18 than the wall 94 </ b> A that forms the turned portion 94. For this reason, the distance between the bottom wall portion 98A of the recess 98 and the upper back spring portion 46 or the seat back pad 18 is shortened. As a result, it is possible to improve the responsiveness until the headrest stay 90 is prevented from rotating toward the front side of the seat back more quickly at the time of a rear collision.

  Moreover, the recessed part 98 contributes to the improvement of the kneeling ability of the passenger | crew who seats on a backseat.

[Supplementary explanation of the above embodiment]
In the embodiment described above, the resin back spring part 38 is integrally formed with the resin back board part 36. However, the present invention is not limited to this, and the resin back spring part is integrally provided with the resin back spring part 38. Also good. That is, the backboard portion and the back spring portion may be manufactured separately and then integrated by welding or the like. Further, the back spring main body portion and the connecting and fixing portion constituting the back spring portion may be manufactured as separate parts and then integrated by welding or the like. In addition, in the above-described embodiment, the lower connection fixing portion 50 has been described as a component on the lower back spring portion 44 (back spring portion 38) side, but the lower connection fixing portion 50 is configured on the backboard portion 36 side. Even if it is regarded as an element, it can be interpreted in any way. This is because, in the state of the finished seat backboard, whether to include the component of the connecting and fixing part on the back spring part side or on the backboard part side is just a matter of how to classify. is there.

  In the above-described embodiment, the headrest stay support portion 92 is integrally formed with the upper end portion 36A of the backboard portion 36 of the seat backboard 16, but the present invention is not limited thereto, and the headrest stay support portion is separate from the backboard portion. Alternatively, the headrest stay support part may be integrated with the upper end part of the backboard part by welding or the like.

  Furthermore, in the above-described embodiment, the headrest stay support portion 92 is formed in a rectangular tube shape, but this is not a limitation, and at least the front wall portion 92A of the headrest stay support portion 92 or a wall corresponding thereto exists. Good. Therefore, it does not necessarily need to be cylindrical, and for example, it may be formed in a U shape with the vehicle rear side open.

  Further, in the embodiment described above, the turn part 94 is formed, but the present invention is not limited to this, and the turn part 94 may not necessarily be formed.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat back 14 Seat back frame 16 Seat back board 18 Seat back pad 26 Side frame 28 Upper frame 28A Upper surface part 36 Back board part 36A Upper end part 48 Lower back spring main body part (back spring main body part)
54 Upper back spring body (back spring body)
84 Headrest 86 Headrest stay support 88 Headrest body 90 Headrest stay 92 Headrest stay support 92A Front wall (wall)
94 groin 98 concavity (groin)

Claims (5)

A backboard portion formed of a resin plate and disposed on the back side of the seatback frame;
A headrest stay support portion that supports a headrest stay that is provided integrally or integrally with the upper end portion of the backboard portion, and that extends in the headrest height direction from the lower surface of the headrest body that supports the occupant head;
With seat backboard. The headrest stay support portion includes at least a wall disposed on a seat back front side of the headrest stay,
The seat back board according to claim 1. By being arranged along the seat width direction between a pair of left and right side frames provided in the seat back frame and provided integrally or integrally with the back board portion, a load acting on the rear side of the seat back acts. It has a back spring body made of resin that is bent and deformed in the load acting direction.
The seat back board according to claim 1 or 2, characterized by the above-mentioned. On the upper part of the backboard part, there is provided a curled part that becomes a curled shape when viewed from the back side of the backboard part by swelling to the front side of the seat back.
The seat back board according to any one of claims 1 to 3, wherein the seat back board is provided. A seat back frame provided integrally or integrally with a pair of left and right side frames and an upper frame connecting the upper ends of these side frames in the seat width direction;
A headrest that includes a headrest body that supports the head of the passenger and a headrest stay that extends from the lower surface of the headrest body in the headrest height direction and penetrates the upper frame;
The part which protruded below the said upper frame in the said headrest stay while being provided with the said back board part and the said headrest stay support part was supported by the said headrest stay support part. Seat backboard,
A vehicle seat having:

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