JP2000203321A - Seat-back for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat-back for an automobile, which does not give the feeling of foreign materials caused by members supporting a bearing member to an occupant even if load is applied to the back side of the occupant so as to let the bearing member be moved backward, and reduces costs with its structure simplified. SOLUTION: A support member 8 which is moved by a bearing member 6 to be freely moved when it is pressed by the back of an occupant at the time of vehicle collision, comprises a hold member 15 disposed so as to be freely rotated back and forth, which is in an inverted U shape shown in front view, and can be freely inserted vertically with respect to the rear surface of the bearing member 6, and the bearing member 6 and a seat back frame 2 comprise a return spring 16 suspended, which comprises the bearing member 6 energized so as to be held at a specified position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat back, and more particularly to a vehicle seat back structure for protecting a passenger's cervical vertebrae when the vehicle is hit.

[0002]

2. Description of the Related Art As a conventional seat back (3) for an automobile, as shown in International Patent Publication No. 98/09838, a seat back frame (9) and front and rear portions at the upper end of the seat back frame (9) are known. A supporting means (5) supported so as to be rotatable and movable up and down, and a stay (27) at an upper end of the supporting means (5).
A headrest (4) supported movably up and down via a headrest holder (not shown) mounted on the
A pressure receiving member (10) supported by the lower end of the support means (5) and movable by receiving the pressure on the back of the occupant;
And the pressure receiving member (10) is attached to the seat back frame (9).
A link member (11) rotatably supported on the pressure receiving member (10) and a pressure receiving member (10) biased to the front side when a load from the front side to the rear side from the occupant is not applied to the pressure receiving member (10). It comprises at least a coil-shaped spring (16), a back element (20) suspended between the seat back frames (9), and a pad disposed on the front side of the back element (20). Become.

[0003] Therefore, for example, when the own vehicle is collided, an impact load toward the front side acts on the seat back (3) first, and then a recoil load from the occupant toward the rear side. Act. That is, the back element (20) and the pressure receiving member (1) provided between the seat back frames (9) are provided.
The load acts on 0). At that time, the pressure receiving member (10)
Is moved rearward, so that the upper end of the support means (5) is moved to the upper side (24) of the seat back frame (9).
Pivots forward with the pivot point as the pivot, and moves upward,
The headrest (4) supported on the upper end of the support means (5) operates in a direction approaching the occupant's head.

Therefore, even if the seat back (3) flexes backward due to the recoil load of the occupant when the own vehicle is collided, the headrest (4) instantaneously approaches the occupant's head. Is securely received by the headrest (4) to protect the occupant's cervical spine.

[0005]

However, in such a conventional technique, when a load on the rear side of the occupant is applied to the pressure receiving member (10), the pressure receiving member (10) is located on the rear side. When moving, the link member (11) rotatably supporting the pressure receiving member (10) may give a foreign body feeling to the rear flanks of the occupant via the pad. This will have a negative impact on ride quality. Further, the configuration of the occupant cervical vertebra protection means described above is complicated and composed of many parts, which causes a rise in cost.

The present invention has been made by paying attention to such a conventional technique. Even if a load is applied to the rear side of the occupant and the pressure receiving member moves rearward, a member for supporting the pressure receiving member is provided. It is intended to provide an automobile seat back for the purpose of reducing costs by not giving the occupant the sensation of foreign matter due to the above and simplifying the structure.

[0007]

According to the first aspect of the present invention, there is provided a seat back frame, and a supporting means rotatably movable back and forth and vertically movable at an upper end of the seat back frame; A vehicle seat comprising at least a headrest provided at an upper end of the support means, and a pressure receiving member supported by a lower end of the support means and movable by receiving pressure from the back of an occupant. In the back, the seat back frame has an inverted U-shape as viewed from the front, and a holding member that is vertically insertable into a rear surface of the pressure receiving member is disposed so as to be rotatable back and forth. A return spring urged to hold the pressure receiving member at a predetermined position is suspended from the seat back frame.

According to a second aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the holding member insertion portion of the pressure receiving member is close to the front side of the hold member from the pressure receiving member side. An arc-shaped first projection formed on the pressure receiving member, and an arc-shaped second projection formed so as to be closer to a rear side of the holding member than a bracket disposed on a back surface of the pressure receiving member. It consists of.

According to a third aspect of the present invention, there is provided the vehicle seat back according to the second aspect, wherein the first protrusion and / or the second protrusion has a lubricating film on the side of the hold member. Affixed.

According to a fourth aspect of the present invention, there is provided the vehicle seat back according to the second or third aspect, wherein the first protrusion and / or the second protrusion are provided with lubrication on the side of the hold member. Grease having properties.

According to a fifth aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the hold member insertion portion of the pressure receiving member is in contact with the front side of the hold member from the pressure receiving member side. The first rotatably supported shaft
A roller member and a second roller member rotatably supported so as to be in contact with a rear side of the holding member from a bracket disposed on a back surface of the pressure receiving member.

According to a sixth aspect of the present invention, there is provided the automobile seat back according to any one of the first to fifth aspects, wherein the hold member is provided between the hold member insertion portion of the pressure receiving member. The upper side is vertical, and the lower side of the insertion portion is bent from the vertical position in any width direction.

[0013]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Note that FR is described as a front side, RR is a rear side, UP is an upper side, and LWR is a lower side.

FIGS. 1 to 5 show an embodiment of the present invention. Reference numeral 1 denotes an automobile seat back, and reference numeral 3 denotes a headrest.

The seat back 1 includes a seat back frame 2 made of an iron plate, a plurality of S-shaped springs 11 bridged between side frames 2b and 2b 'of the seat back frame 2 described below, and the S-shaped springs. 11, a pad (not shown) formed of polyurethane foam or the like and a skin (not shown) made of cloth or the like covering the pad.

The seat back frame 2 is formed in a substantially horizontal shape and has an upper frame 2a formed with a back member 4 hanging down from a rear side RR, and is suspended from left and right ends of the upper frame 2a. Frame 2b, 2b 'having a substantially symmetrical shape arranged at
And an underframe 2c spanned between lower ends of the side frames 2b and 2b ', and are supported by welding to each other.

An armature holder 5 for holding the armature pipes 7, 7 as supporting means in a freely movable manner so as to be able to move up and down and rotate back and forth is provided on the front side FR surface of the back member 4 at an appropriately separated position. 5 are arranged.

The position of the pressure receiving member 6 bridged at the lower end of the armature pipes 7 is
Is located near the back 30a, and is easily pressed by the behavior of the occupant described later. The pressure receiving member 6 is
It is formed in a rectangular shape extending right and left by a rigid body such as an iron plate.

Since a ring (not shown) made of synthetic resin is incorporated inside each of the armature holders 5, 5, no rubbing noise or the like occurs when the armature pipes 7, 7 move.

The armature pipes 7, 7 are arranged side by side in a right and left direction when viewed from the front, and form a vertical shape. The holding position of the pipes 7, 7 is at least a shoulder point of an AF05% tile mannequin (SAE) in a front view. It is arranged more centrally. It is located on the center side of the shoulder point of the AF05% tile mannequin (SAE), which means that the armature pipes 7, 7 are located inside the shoulder point 31 of most of the occupants 30 of the adult physique. Occupant 30 from the front FR of the seat back frame 2 due to the rear-end collision of the vehicle.
, That is, even if the occupant 30 is pressed against the seat back 1, the shoulder point 31 of the occupant 30
It will not interfere with the armature pipes 7,7.

The rear portions of the armature pipes 7, 7 are located forward from the bent portion 7a in a side view as shown in FIG.
It is formed to be bent in the shape of a "ku". The bent portion 7a
Lower ends 8a, 8a of stays 8, 8 of the headrest 3
Is formed at a close position so as not to interfere with the bent portion 7
The inner surface of a is a curved surface having a radius of 20 mm.

As described above, the stays 8, 8 of the headrest 3 are provided in the armature pipes 7, 7.
And headrest holders 9, 9 which are slidably supported up and down.

Reference numeral 10 denotes the seat back frame 2.
The stopper 10 is made of a rubber material, and holds the rear surfaces of the armature pipes 7.

As shown in FIG. 3, reference numeral 15 denotes a first member 15a arranged in a horizontal state when viewed from the front, and second and third members 15b and 15c arranged vertically in the left and right directions. Reverse U
A holding member which is shaped like a letter and is vertically insertable into the rear surface 6a of the pressure receiving member 6.
The lower ends of the second and third members 15b and 15c are supported by welding EW on the under frame 2c of the seat back frame 2. The holding member 15 is made of an iron bar having an appropriate elasticity, and is rotatable in the front and rear FR and RR directions.

The pressure receiving member 6 and the under frame 2c of the seat back frame 2
Is returned to a predetermined position, that is, the headrest 3 connected to the pressure receiving member 6 via the armature pipe 7 so as to be held at a neutral position (the position shown in FIG. 1). It is arranged to be suspended. Reference numeral 6b denotes a through hole formed in the pressure receiving member 6 so as to suspend the return spring 16.

Reference numeral 17 denotes a holding member insertion portion. The holding member insertion portion 17 is connected to the second and third members 15b and 15b of the holding member 15 from the back surface 6a side of the pressure receiving member 6.
An arc-shaped first protruding portion 18 formed so as to protrude near the front sides 15ba and 15ca of the pressure receiving member 5c, and a bracket 20 disposed on the back surface 6a of the pressure receiving member 6 by welding SW (or riveting). Rear sides 15bb, 15c of the second and third members 15b, 15c of the holding member 15
and a second arc-shaped second projection 19 which is formed so as to protrude so as to be close to b.

Films 21 and 22 having lubricity are attached to the surfaces of the first projection 18 and the second projection 19 on the hold member 15 side. The films 21, 22 are
In order to reduce costs, etc., only one of them is allocated,
It is not necessary to dispose the other, but it goes without saying that sandwiching between the films 21 and 22 is superior in lubricity with the hold member 15. Instead of the films 21 and 22, lubricating grease may be applied to each of the first protrusion 18 and the second protrusion 19 on the hold member 15 side.

Reference numeral 23 denotes an occupant 30 as shown in FIG.
In the normal state in which only the seat 15 is seated, the front sides 15ba, 15c of the second and third members 15b, 15c of the holding member 15
a, which is provided between the side frames 2b and 2b 'and is a stopper for preventing the further movement to the front side FR.

Next, the operation according to this embodiment will be described.

As shown in FIG. 1, when the occupant 30 is seated on a seat cushion (not shown) of the seat and the back 30a leans on the seat back 1, the occupant 3
There is a slight gap 32 between the head 30b and the headrest 3, and a slight gap 33 is formed between the back 30a of the occupant 30 and the pressure receiving member 6. However, the back 30 of the occupant 30
Although a pad and a skin member (not shown) are interposed between a and the pressure receiving member 6, the load from the occupant 30 is not applied to the pressure receiving member 6.

In this state, when the own vehicle is collided and the seated occupant 30 is pushed by the rear RR due to the secondary collision and the pad or the like moves to the rear RR, the back 30a of the occupant 30
As a result, the pressure receiving member 6 is pushed toward the rear side RR via a pad or the like. Due to the load in the rear RR direction by the occupant 30,
Even if the pad or the like moves to the rear side RR, the pad or the like does not bite into the armature pipe 7 because the shoulder point 31 of the occupant 30 is at least the shoulder point 31 of the AF05% tile mannequin. For this reason, the rising UP caused by the rotation of the armature pipe 7 is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.

Since the pressure receiving member 6 is held by the holding member 15, when the holding member 15 is pressed by the pressure receiving member 6, the lower ends of the second and third members 15b and 15c of the holding member 15 are moved. Rear RR and lower L at center
Rotated to WR. By this rotation, the lower end of the armature pipe 7, that is, the pressure receiving member 6 itself moves to the upper side UP and the rear side RR. With the movement, the upper end of the armature pipe 7, that is, the headrest holder 9,
Numeral 9 urges the upper arm UP and the front FR around the armature holder 5. Due to the upward movement, the stay 8 of the headrest 3 is also moved to the upper side UP and the front side FR.

As described above, the headrest holders 9, 9 are arranged such that the upper
Further, since the headrest 3 is supported by the stays 8 and 8, the headrest 3 supported by the stays 8, as shown in FIG.
Abuts on the head 30b. In FIG. 5, the headrest 3 is illustrated as biting into the head 30 b of the occupant 30, but the headrest 3 is recessed at the center in the left and right direction, and the head 30 b of the occupant 30 also has a cross section as is well known. It is not a bite because it is almost cylindrical.

In this manner, the back 30a of the occupant 30 moves to the rear side RR, so that the head 30b of the occupant 30 that is left behind is reliably held by the movement of the headrest 3. In this state, the rear surface of the armature pipe 7 moves forward with respect to the pressure receiving member 6.
When the pressure receiving member 6 moves to the rear side RR, the pressure receiving member 6 does not protrude to the rear side RR as shown in FIG. become.

The headrest holders 9, 9
In addition, since the stays 8, 8 of the headrest 3 are supported so as to be able to move up and down, the heads 3 of the occupants 30 having different physical sizes are
The headrest 3 can be appropriately adjusted to the position of 0b.

A return spring 1 is provided between the pressure receiving member 6 and the under frame 2c of the seat back frame 2 by urging the pressure receiving member 6 toward the front side FR.
6, the pressure receiving member 6 is urged to the front side FR by the return spring 16 in a state where the pushing force on the rear side RR by the back 30a of the occupant 30 is not applied, as shown in FIG. Then, it is held in a state of being pressed against the stopper 23. That is, the headrest 3 supported at the upper end of the armature pipe 7 supporting the pressure receiving member 6 at the lower end is located at the rear side RR according to the seesaw principle.
The occupant's 30 habitability is not impaired.

The seat back frame 2 includes:
The pressure receiving member 6 has an inverted U-shape when viewed from the front and a rear surface 6 of the pressure receiving member 6.
The holding member 15 is vertically rotatable with respect to a and is rotatable back and forth. The pressure receiving member 6 and the seat back frame 2 hold the pressure receiving member 6 at a predetermined position. Since the return spring 16 which is urged is suspended and arranged, the pressure receiving member 6
Even if the pressure receiving member 6 is moved to the rear side RR due to the load on the rear side RR of the occupant 30 being supported by the hold member 15 which does not interfere with the occupant 30, the foreign object feeling due to the member supporting the pressure receiving member 6 is reduced. It is not given to the crew 30. Also,
Since the structure is simplified, the cost can be reduced.

The holding member insertion portion 17 of the pressure receiving member 6 is provided with the holding member 15 from the pressure receiving member 6 side.
Front sides 15ba, 15 of the second and third members 15b, 15c
arc-shaped first protrusion formed so as to be close to ca
The second member 3 and the third member 1 of the holding member 15 are formed by a projection 18 and a bracket 20 disposed on the back surface 6 a of the pressure receiving member 6.
When the pressure receiving member 6 is urged toward the rear side RR, it is held when the pressure receiving member 6 is urged toward the rear side RR. The member 15 is the second and third members 15b, 15
Although the pressure is rotationally urged toward the rear side RR and the lower side LWR around the lower side of c, the pressure receiving member 6 can move smoothly to the upper side UP only by being in point contact with the holding member 15. In this way, the armature pipe 7 as the support means supported by the pressure receiving member 6 can move the headrest 3 to the front side FR and the upper side UP.

The first projection 18 and the second projection 19
The second and third members 15b, 15 of the holding member 15
front side 15ba, 15ca and rear side 15bb, 15 of c
Since the films 21 and 22 having lubricity are attached to cb, when the pressure receiving member 6 is moved, the front sides 15ba and 15ba of the second and third members 15b and 15c of the hold member 15 are moved.
Since the films 21 and 22 of the first projection 18 and the second projection 19 in contact with the rear member 15ca and the rear sides 15bb and 15cb slide smoothly, the second and third members of the holding member 15 are smoothly moved.
It can move on the front side 15ba, 15ca and the rear side 15bb, 15cb of the members 15b, 15c. Thus, the armature pipe 7 supported by the pressure receiving member 6 can move the headrest 3 to the front side FR and the upper side UP.

Even if grease having lubricity is applied instead of the films 21 and 22, when the pressure receiving member 6 is moved, the second and third members 15b and 15b of the holding member 15 are moved.
front side 15ba, 15ca and rear side 15bb, 15 of c
Since the grease applied to the first projection 18 and the second projection 19 in contact with cb slides smoothly, the front sides 15ba, 15ba of the second and third members 15b, 15c of the holding member 15 smoothly.
15ca and the rear side 15bb, 15cb.

In the above description of the operation, the head 30b of the occupant 30
Although it is assumed that the headrest 3 is securely held by the movement of the headrest 3, the movement of the headrest 3 and the movement of the seatback 1 are relative, and the seatback 1 is moved backward by the back 30a of the occupant 30. Even if it moves to RR, the headrest 3 does not move with respect to the head 30b of the occupant 30,
This also includes a description that the head 30b of the occupant 30 is protected by being held at that position.

FIG. 6 shows another embodiment of the holding member insertion portion. The holding member insertion portion 24 is provided with the second and third members 15 of the holding member 15 from the pressure receiving member 6 side.
b, 15c so as to contact the front side 15ba, 15ca,
A first roller member 25 rotatably supported by a shaft portion 25a, and a second member and a third member 15b, 15c of the holding member 15 from a bracket (not shown) arranged on the back surface 6a of the pressure receiving member 6. A second shaft rotatably supported by the shaft portion 26a so as to contact the sides 15bb and 15cb.
It is composed of a roller member 26.

According to this structure, when the pressure receiving member 6 is moved, the second and third members 15b, 1b of the hold member 15 are moved.
First roller member 2 in contact with front sides 15ba, 15ca of 5c
5 and the second and third members 15b of the holding member 15,
Since the second roller member 26 in contact with the rear side 15bb, 15cb of the 15c rolls, it can move on the hold member 15 smoothly. Thus, the armature pipe 7 supported by the pressure receiving member 6 moves the headrest 3 to the front side FR.
And it can be moved to upper side UP.

FIG. 7 shows another embodiment of the holding member. The holding member 27 is composed of a first member 27a arranged in a horizontal state when viewed from the front, and a left and right member 27a. UP above holding member insertion parts 17, 24
Form vertical portions 27ba and 27ca, and the LWR below the insertion portions 17 and 24 is formed by portions 27bb and 27cb that are bent in the width direction from the vertical position. The three members 27b and 27c form an inverted U shape, and can be vertically inserted into the rear surface 6a of the pressure receiving member 6 by the holding member insertion portions 17 and 24. The lower ends of the second and third members 27b and 27c of the hold member 27 are supported by welding EW on the under frame 2c of the seat back frame 2. The holding member 27
Is made of an iron bar having appropriate elasticity, and has front and rear FR, RR
It is rotatable so that it is in the direction.

According to this configuration, the holding member 2
7 is the holding member insertion portion 17 of the pressure receiving member 6,
The UP above 24 is vertical, and the insertion portions 17 and 24
The lower LWR is bent in the width direction (inward in this embodiment) from the vertical portions 27ba, 27ca, so that the holding member 27 interferes with the pressure receiving member 6 at the bent portion 28, so that the hold is performed. The vertical movement of the member 27 is restricted.

FIG. 8 shows another embodiment of the manner of supporting the lower end portions of the second and third members 15b, 15c, 27b, 27c of the holding members 15, 27.
Pins 3 on brackets 35 and 35 'supported by welding
6 is inserted and rotatably supported by the pin 36. Reference numerals 37 and 38 denote retaining means for the pin 36.

[0047]

According to the first aspect of the present invention, the seat back frame has an inverted U-shape when viewed from the front, and a hold member which can be vertically inserted and retracted into the rear surface of the pressure receiving member. Since the pressure receiving member and the seat back frame are arranged so as to be suspended, a return spring biased to hold the pressure receiving member at a predetermined position is suspended and disposed. The pressure receiving member is supported by a hold member that does not interfere with the occupant,
Even if a pressure is applied to the rear side of the occupant and the pressure receiving member moves rearward, the occupant is not given a foreign object sensation due to the member supporting the pressure receiving member. In addition, by simplifying the structure,
Cost reduction can be achieved.

According to the second aspect of the present invention, the holding member insertion portion of the pressure receiving member is formed so as to protrude from the pressure receiving member side so as to approach the front side of the hold member. And a second arc-shaped protrusion formed so as to protrude closer to the rear side of the hold member than a bracket disposed on the back surface of the pressure receiving member. When the holding member is urged to rotate, the holding member is rotated and urged rearward and downward centering on the lower side, but the pressure receiving member can smoothly move upward only by being in point contact with the holding member. . Thus, the supporting means supported by the pressure receiving member can move the headrest forward and upward.

According to the third aspect of the present invention, the first
Since a lubricating film is attached to the protrusion and / or the second protrusion on the side of the hold member, the first protrusion and / or the second protrusion that contact the hold member when the pressure receiving member is moved.
Since the film of the protrusion slides smoothly, it can be smoothly moved on the holding member. Thus, the supporting means supported by the pressure receiving member can move the headrest forward and upward.

According to the fourth aspect of the present invention, the first
Since the lubricating grease is applied to the protrusion and / or the second protrusion on the side of the hold member, the first protrusion and / or the second protrusion contact the hold member when the pressure receiving member is moved. Since the grease applied to the holding member slides smoothly, the grease can be smoothly moved on the holding member. Thus, the supporting means supported by the pressure receiving member can move the headrest forward and upward.

According to the fifth aspect of the present invention, the holding member insertion portion of the pressure receiving member is rotatably supported so as to be in contact with the pressure receiving member side and the front side of the hold member. And a second roller member rotatably supported so as to be in contact with the rear side of the holding member from a bracket disposed on the back surface of the pressure receiving member, so that when the pressure receiving member is moved, Since the first roller member and the second roller member that are in contact with the hold member roll, it is possible to move on the hold member smoothly. Thus, the supporting means supported by the pressure receiving member can move the headrest forward and upward.

According to the invention described in claim 6, the hold member has a vertical shape above the holding member insertion portion of the pressure receiving member, and has a lower portion below the insertion portion in the width direction than the vertical position. Since the cuff is bent, the hold member interferes with the pressure receiving member at the bent portion, so that the vertical movement of the hold member can be restricted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a periphery of a frame of a seat back according to an embodiment of the present invention.

FIG. 2 is a front view showing the area around the frame of the seat back excluding the occupant in FIG. 1;

FIG. 3 is a sectional view taken along the line SA-SA of FIG. 2;

FIG. 4 is a perspective view of the periphery of the frame of the seat back of FIG. 1;

FIG. 5 is a sectional view showing an operation embodiment of FIG. 1;

FIG. 6 is a sectional view of another embodiment of the holding member insertion portion of FIG. 3;

FIG. 7 is a front view of another embodiment of the holding member of FIG. 1;

FIG. 8 is an enlarged explanatory view of a portion B in FIG. 7, which is another embodiment of a lower end portion of the holding member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat back 2 Seat back frame 3 Headrest 6 Pressure receiving member 7 Armature pipe as support means 8 Headrest stay 9 Headrest holder 15, 27 Hold member 16 Return spring 17, 24 Hold member insertion part 18 First protrusion 19 Second protrusion 21, 22 Film 25 First roller member 26 Second roller member 28 Bend portion 30 Occupant 30a Occupant's back 30b Occupant's head FR Front side RR Rear side UP Upper side LWR Lower side

Claims (6)

[Claims] 1. A seat back frame, supporting means rotatably movable back and forth at the upper end of the seat back frame and movably up and down, and a headrest disposed at the upper end of the supporting means. And a pressure receiving member supported by a lower end portion of the support means and movable by receiving pressure from the back of an occupant, wherein the seat back frame has a front view. A holding member having an inverted U shape and being vertically insertable into and out of the rear surface of the pressure receiving member is disposed so as to be rotatable back and forth. The pressure receiving member and the seat back frame are provided with the pressure receiving member in a predetermined manner. A seat back for an automobile, wherein a return spring biased so as to be held at a position is suspended and disposed. 2. The vehicle seat back according to claim 1, wherein the holding member insertion portion of the pressure receiving member is formed to protrude from the pressure receiving member side to approach the front side of the hold member. An arc-shaped first projection and an arc-shaped second projection formed so as to project closer to the rear side of the hold member than a bracket disposed on the back surface of the pressure receiving member. Characteristic car seat back. 3. The vehicle seat back according to claim 2, wherein a lubricating film is attached to the first protrusion and / or the second protrusion on the side of the hold member. Characteristic car seat back. 4. The vehicle seat back according to claim 2, wherein a lubricating grease is applied to the first protrusion and / or the second protrusion on the side of the hold member. An automobile seat back comprising: 5. The vehicle seat back according to claim 1, wherein the holding member insertion portion of the pressure receiving member is rotatably supported so as to be in contact with a front side of the holding member from a pressure receiving member side. A first roller member, and a second roller member rotatably supported so as to be in contact with a rear side of the holding member from a bracket disposed on the back surface of the pressure receiving member. Car seat back. 6. The vehicle seat back according to claim 1, wherein the holding member has a vertical shape above the holding member insertion portion of the pressure receiving member. A seat back for an automobile, wherein a portion below the insertion portion is bent in any width direction from the vertical position.