JP2000210157A - Seatback for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve comfort to sit on without giving inconveniences and ill feelings when a load is applied, and reduce cost in a simple structure. SOLUTION: A flat mat 19 is uniformly arranged between both side frames of a seatback frame 2 and an operating plate 21 is rotatably mounted on the rear side of the flat mat. Energizing means 18 are provided between each of the side frames and the operating plate 21 for normally energizing the operating plate to the front side FR. Elastic means 20 are laid between each of the side frames and the flat mat for expanding the flat mat so as to be movable to the rear side with a back leaning load following seating. The energizing means are prohibited from elongation with a seating load but permitted to be elongate only with an impulse load following rear-end collision, so that a pressurized member 6 can be moved to the rear side with the movement of the operating plate.

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, since the pressure receiving member (10) is formed to be long in the right and left directions, when the pressure receiving member (10) moves, the pad is moved. There is a danger that it will sink into a part of.

Further, when an impact load such as a rear-end collision is applied, and the load on the rear side is applied to the pressure receiving member (10) by the occupant, the pressure receiving member (10) moves when the pressure receiving member (10) moves rearward. There is a possibility that the link member (11) that rotationally supports the member (10) may be felt as a foreign object feeling on the rear flanks of the occupant through the pad.

Further, since the structure of the occupant cervical vertebra protection means described above is complicated and composed of many parts,
This is one cause of soaring costs.

The present invention has been made by paying attention to such a conventional technique, and when a pressure is applied to the rear side of the occupant and the pressure receiving member moves rearward, there is a problem that the pressure receiving member is sunk into the pad. Not only does it not occur, but it does not give the occupant a foreign-body sensation due to the member supporting the pressure-receiving member. An object of the present invention is to provide an automobile seat back for the purpose of reduction.

[0009]

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, between both side frames of the seat back frame, a flat mat is uniformly arranged, and an operation plate is rotatably mounted on the rear side of the flat mat, and the both side frames and the Between the operating plate, an urging means for constantly urging the operating plate to the front side is interposed, and between the both side frames and the flat mat. The elastic member extends and contracts so that the flat mat can be moved rearward by a backrest load caused by seating, and the urging means does not extend under a sitting load, but expands only under an impact load accompanying a rear-end collision. Then, the pressure receiving member can be moved rearward by the movement of the operation plate.

According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the elastic means is configured to return the flat mat to its original position in a state where there is no backrest load due to the occupant sitting. It is possible to return to.

According to a third aspect of the present invention, there is provided an automobile seat back according to the first or second aspect, wherein one of the mounting portions of the operating plate is provided between both side frames of the seat back frame. A link member rotatably connected to the pressure receiving member and the other rotatably connected to the pressure receiving member is rotatably connected between the one and the other link members.

[0012]

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 4 show an embodiment of the present invention, wherein 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, and an armature pipe 7 as a support means rotatably supported on the upper end of the seat back frame 2 so as to be able to rotate back and forth and move up and down. 7, a headrest 3 which is provided so as to be bridged to the upper end portions of the armature pipes 7, 7, and the armature pipe 7,
7 and the back 30 of the occupant 30
and at least a pressure receiving member 6 that can move under the pressure of a.

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 hung down from left and right ends of the upper frame 2a. Frame 2b, 2b 'having a substantially symmetrical shape arranged at
And an underframe 2c provided between the lower ends of the side frames 2b and 2b ', and the frames are supported by welding.

Armature holders 5, 5 for holding the armature pipes 7, 7 movably so as to be able to move up and down and to rotate back and forth are arranged on the front side FR surface of the back member 4 at appropriately spaced positions. Be done. The armature pipes 7, 7 held by the armature holders 5, 5 are held at a position where the front-back dimension 36 of the back 30 a centered on the hip point HP of the occupant 30 with the torso line 35 is 250 mm or more.

The position of the pressure receiving member 6 bridged at the lower end of the armature pipes 7 is
Occupant 30 to be described later,
Is a position that is likely to be pressed by the above behavior. The pressure receiving member 6
Is formed in a rectangular shape extending right and left by a rigid body such as an iron plate.

Since a ring made of a synthetic resin (not shown) 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 vertically arranged side by side in a right and left direction when viewed from the front, and 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.

Further, 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 first stopper 10 is made of a rubber material, and holds the rear surfaces of the armature pipes 7, 7. The first stopper 10 is supported by the back member 4 of the upper frame 2a.

One shaft portion 15a is rotatably connected between both side frames 2b, 2b 'of the seat back frame 2 and rotatably connected to mounting portions 6a on both sides of the pressure receiving member 6. The other shaft 15
The operation plate 21 is rotatably connected to a shaft 15c between the one shaft 15a and the other shaft 15b of the link member 15 having the b. As shown in FIG. 1, the link member 15 has a triangular shape in a side view.

A rectangular flat mat 19 is uniformly arranged between the side frames 2b, 2b 'of the seat back frame 2. The flat mat 19
Are not stretched, are arranged on the back side of a pad (not shown), and have a planar shape. The operation plate 21
Is arranged on the rear side of the flat mat 19, but the range in which the coil spring 20 described later extends in a state where the occupant 30 sits and leans on the back, in other words, the range in which the return spring 18 described later does not extend. In the movement of the flat mat 19, the flat mat 19 is disposed at a position not in contact with the rear surface.

Between the side frames 2b, 2b 'and the operating plate 21, the operating plate 21 is always connected to the front FR.
Spring 1 as urging means for urging
8 is interposed and supported. The return spring 18
Does not extend under a sitting load by the occupant 30, but expands only under an impact load accompanying a rear-end collision, so that the pressure receiving member 6 can be pressed by the movement of the operation plate 21.

The flat mat 19 is moved between the front mat FR and the rear RR between the flat mat 19 and the hook members 22 supported by the side frames 2b, 2b 'and the side frames 2b, 2b'. The coiled springs 20, 20,... As elastic means that extend and contract so as to be able to return to the original position as much as possible are interposed.

Reference numeral 23 denotes an occupant 30 as shown in FIG.
In a normal state in which the flat frame 19 is merely seated, the second stopper is in contact with the mounting portions 21a and 21a 'of the operation plate 21 to prevent the flat mat 19 from moving any further to the front side FR. 'It is erected between them.

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

As shown by the solid line in FIG. 1, the occupant 30 is seated on the seat cushion of the seat 11 composed of the seat back 1 and a seat cushion (not shown), and the driving state in which the back 30a is not leaned on the seat back 1. In such a case, there is a gap 32 between the head 30b of the occupant 30 and the headrest 3, and a gap 33 is also formed between the back 30a of the occupant 30 and the pressure receiving member 6. However, between the back 30a of the occupant 30 and the pressure receiving member 6, the flat mat 19, a pad or a skin member (not shown) is interposed.

When the occupant 30 leans against the seat back 1 in a relaxed state while sitting, the back 3 of the occupant 30
As shown by the two-dot chain line in FIG. 1, the load from the flat mat 19 is moved to the rear side RR by the movement stroke (4)
(0 mm) so that the back 30a of the occupant 30
The gap 33a between the occupant 30 and the pressure receiving member 6 is smaller than the gap 33, but is in a state where the back 30a of the occupant 30 can be softly received. Therefore, the seating feeling is good. Of course, no load is applied to the operation plate 21. That is, according to such a structure, there is no such thing as a link as in the related art, and therefore, no foreign object feeling is given to the rear flanks of the occupant 30.

In this state, when the own vehicle is collided and an impact load is applied, from the seating position of the occupant 30 shown by the two-dot chain line in FIG.
Will be pushed. The impact value associated with such a secondary collision is
Since the return spring 18 is at or above the load at which the return spring 18 starts to expand, the return spring 18 starts to expand, and not only the flat mat 19 but also the operating plate 21
It is pushed by R. Since a load is applied to the shaft portion 15c supporting the operation plate 21, the link member 15 is connected to one of the shaft portions 15c.
It is rotated to the rear side RR around a. Due to the rotation, the pressure receiving member 6 connected to the other shaft portion 15b of the link member 15 is moved to the rear side RR and the upper side UP. By moving the pressure receiving member 6, the headrest 3 is moved to the upper side UP and the front side FR via the armature pipe 7, so that the head 30b of the occupant 30 can be securely held and the neck can be protected.

The shoulder point 31 of the occupant 30
Are the shoulder points of at least the AF05% tile mannequin, and the pad (not shown) does not cut into the armature pipe 7 since the flat mat 19 is interposed. For this reason, the armature pipe 7
As a result, the rear surface of the flat mat 19 can be smoothly moved, so that the upward 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.

In this way, the back 30a of the occupant 30 moves to the rear side RR due to the impact, so that the head 30b of the occupant 30, which should behave as if left, is moved to the headrest 3a.
Is surely held. Moreover,
In this state, since the rear surface of the armature pipe 7 is bent forward in a "-" shape with respect to the pressure receiving member 6, when the pressure receiving member 6 moves to the rear side RR, as shown in FIG. In addition, the pressure receiving member 6 does not protrude to the rear side RR, and the space with the rear passenger is secured.

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.

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.

[0036]

According to the first aspect of the present invention, a flat mat is uniformly disposed between both side frames of the seat back frame via elastic means, and the rear side of the flat mat is provided. Since the operating plate is rotatably mounted on the flat mat, even if the flat mat moves rearward due to the occupant sitting and the backrest load being applied, not only does the flat mat move in Since there are no members such as links on both sides, not only the occupant is not given a foreign object sensation due to the member supporting the pressure receiving member, but also the cost can be reduced by simplifying the structure.

Further, between the side frames and the operating plate, there is provided an urging means for constantly urging the operating plate to the front side, and the urging means is extended when a seating load is applied. Because the pressure receiving member is extended only by the impact load accompanying the rear impact and the pressure receiving member can be moved rearward by the movement of the operating plate, the flat mat moves rearward together with the support plate when the impact load accompanying the rear impact is applied. Then, since the pressure receiving member is pushed by the movement, the headrest can be moved upward and forward via the support means, the headrest is quickly raised and the occupant's head is reliably protected, and the neck protection is reliably performed. Become.

Further, an elastic means is provided between the both side frames and the flat mat so that the flat mat can be moved rearward by a backrest load caused by seating. In the seated or relaxed state of the occupant, the elastic means extends in response to the backrest load of the occupant's back, and the flat mat moves rearward, so that the seating feeling is good.

According to the second aspect of the present invention, the elastic means enables the flat mat to return to the original position in a state where there is no backrest load due to seating of the occupant. In the state where no load is applied,
The position of the seat back that supports the occupant when sitting will always return to the neutral position.

According to the third aspect of the present invention, one of the mounting portions of the operating plate is rotatably connected between both side frames of the seat back frame, and the other is rotatable with the pressure receiving member. Since the link member is rotatably connected between the one and the other of the link members, a state in which a load enough to overcome the urging means is applied to the operation plate via the flat mat is a collision. Since it is the time when the link member to which the operation plate is connected is
By being urged to rotate about one side, the pressure receiving member connected to the other side is moved, and the headrest is moved upward and forward through the support means, thereby securely holding the occupant's head. Thus, neck protection is assured.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view around a frame of the seat back of FIG. 1;

FIG. 4 is a sectional view showing an operation embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat back 2 Seat back frame 3 Headrest 6 Pressure receiving member 7 Armature pipe as supporting means 8 Headrest stay 9 Headrest holder 15 Link member 18 Return spring as urging means 19 Flat mat 20 Coil spring as elastic means 21 Operating plate 30 occupant 30a occupant's back 30b occupant's head FR front side RR rear side UP upper side LWR lower side

Claims (3)

[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 at the lower end of the support means and movable by receiving the pressure on the back of the occupant, and comprising at least a pressure receiving member, between the side frames of the seat back frame. Is
A flat mat is uniformly arranged and an operation plate is rotatably mounted on the rear side of the flat mat. Between the side frames and the operation plate, the operation plate is always on the front side. An elastic means interposed between the side frames and the flat mat, the elastic means extending and contracting so as to be able to move the flat mat rearward by a backrest load caused by seating; The urging means does not extend under a sitting load, but extends only under an impact load accompanying a rear-end collision, and can move the pressure receiving member rearward by moving the operation plate. Automotive seat back. 2. The automobile seat back according to claim 1, wherein the elastic means is capable of returning the flat mat to an original position in a state where there is no backrest load due to seating of an occupant. An automobile seat back characterized by the above-mentioned. 3. The vehicle seat back according to claim 1, wherein one of the mounting portions of the operation plate is rotatably connected between both side frames of the seat back frame. And a link member rotatably connected to the pressure receiving member, the other being rotatably connected between the one and the other of the link members.