JP2000201769A - Seat back for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seta back for automobile which gives no foreign matter feeling to a user when loaded, has improved seating feeling, and has simple structure at low cost. SOLUTION: A flat mat 19 is equipped in between flat mat support members 17. An energizing means 18 to usually energize the flat mat support member 17 to the front side is equipped in between both side frames 2b and the flat mat support member 17. An extensible elastic means 20 is put in between the flat mat support member and the flat mat so that the flat mat is enabled to move in the longitudinal direction and to return to the original place. The energizing means is not extended in the seating condition but extended only by the shock load by a rear-end collision to enable a pressure receiving member to press by movement of the flat mat support member.

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.

Further, by disposing the pressure receiving member (10) in a part of the pad by arranging the flat mat, the bending of the flat mat is reduced, and a feeling of bottoming is generated by the flat mat when seated. The feeling of sitting is no longer desirable. Conversely, if the flat mat can be moved back and forth during seating in order to improve the seating sensation during seating, the pressure receiving member (10) can be operated even when an impact load is input and the flat mat moves. The start of the movement of the headrest (4) is delayed.

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. When a load is applied to the rear side of the occupant and the pressure receiving member moves to the rear side, the foreign matter is generated by the member supporting the pressure receiving member. Provides a seat back for automobiles that aims to reduce the cost by improving the seating feeling and simplifying the structure despite providing a large amount of movement of the headrest without giving the occupant a sense of comfort. Is what you do.

[0009]

According to the first aspect of the present invention, there is provided a seat back frame, and a supporting means supported on an upper end portion of the seat back frame so as to be rotatable back and forth and vertically movable. 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 support member is arranged along the side frame, and between the flat mat support members, a flat mat is arranged, Between both side frames and the flat mat support member, an urging force is provided by constantly urging the flat mat support member to the front side. A step is interposed, and elastic means is provided between the flat mat support member and the flat mat to extend and contract so as to be able to move the flat mat back and forth and return to the original position, The urging means does not extend under a sitting load, but expands only under an impact load accompanying a rear-end collision, and can press the pressure receiving member by moving the flat mat supporting member.

According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the flat mat support member is vertically spaced apart from both side frames of the seat back frame. It is supported by a first link member and a second link member rotatably supported.

According to a third aspect of the present invention, there is provided the automobile seat back according to the second aspect, wherein one of the first link members is rotatably connected to both side frames of the seat back frame. The other is rotatably connected to the pressure receiving member, and the one and the other are rotatably connected to the flat mat support member.

[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 supporting means rotatably supported on the upper end of the seat back frame 2 so as to be able to rotate back and forth and up and down. A headrest 3 disposed at an upper end of the armature pipe 7, and a pressure receiving member 6 supported by the lower end of the armature pipe 7 and movable by receiving the pressure of the back 30a of the occupant 30. It is composed.

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
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 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 link members 15, 15 'are attached to both side frames 2b, 2b' of the seat back frame 2.
And the second link members 16, 16 'are rotatably supported by being vertically separated from each other. The first link 15,
Flat mat support members 17 and 17 'are provided on the 15' and the second links 16 and 16 ', and the flat mat support members 17 and 17' are always on the front side by return springs 18 and 18 as urging means. Being energized by FR. The return springs 18, 18
It is possible to press the pressure receiving member 6 by elongating only with an impact load accompanying a rear-end collision without expanding with a sitting load.

A flat mat 19 is provided on the front side FR of the pressure receiving member 6 and between the flat mat support members 17 and 17 '.
It is arranged via 0 and 20.

As shown in FIG. 1, the first link member 15 has a triangular shape in a side view, and one of the shaft portions 15a has two side frames 2b of the seat back frame 2.
2b 'is rotatably connected to the other shaft 1
5b is rotatably connected to a mounting portion 6a projecting from both sides of the pressure receiving member 6, and the one shaft portion 15
a and the shaft portion 15c between the other shaft portion 15b is connected to the upper end portions 17a, 17 of the flat mat support members 17, 17 '.
It is rotatably connected to a '.

Reference numeral 23 denotes an occupant 30 as shown in FIG.
In a normal state in which the flat mat 19 is just seated, the second stopper contacts the front sides 17b and 17b 'of the flat mat support members 17 and 17' and prevents the flat mat 19 from moving any further to the front side FR. Frame 2b,
2b '.

The flat mat 19 itself is not stretched, and is arranged on the back side of a pad (not shown), and has a planar shape.

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 pressure receiving member 6. 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, the occupant 30 seated as shown by a two-dot chain line in FIG. 4 is subjected to a secondary collision as shown by a solid line in FIG. Is pushed by the rear side RR. Since the impact value associated with such a secondary collision is equal to or greater than 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 flat mat support member 17 is moved to the rear side RR. Pressed. Since a load is applied to the shaft portion 15c supporting the flat mat support member 17, the first link member 15 is rotated to the rear side RR about the shaft portion 15a. Due to the rotation, the pressure receiving member 6 connected to the shaft portion 15b of the first 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
Is a shoulder point 31 of at least an AF05% tile mannequin, and a pad (not shown) is attached to the armature pipe 7 because the flat mat 19 is interposed.
Never dig into it. Therefore, the armature pipe 7
Can smoothly move the rear surface of the flat mat 19, and the lift U with the rotation of the armature pipe 7 can be increased.
P 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.
In this state, the rear surface of the armature pipe 7 is bent forward in a "-" shape with respect to the pressure receiving member 6 in this state.
When the pressure receiving member 6 moves to the rear side RR, as shown in FIG. 4, the pressure receiving member 6 does not protrude to the rear side RR, and a space with the rear occupant 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, since the flat mat is provided with the elastic means which expands and contracts so as to be able to move back and forth and return to the original position, the occupant can normally sit down. In a relaxed state, the elastic means expands in response to the load on the back of the occupant, and the flat mat moves to the rear side. There is no foreign body sensation on the back flank.

Further, since the flat mat is supported by the urging means which is extended only by the impact load caused by the rear impact, when the impact load caused by the rear impact is applied, the flat mat moves rearward, and the movement of the flat mat is caused by the movement. Press the member,
Since the headrest can be moved upward and forward through the support means, the headrest can be quickly started up and the occupant's head can be reliably protected, so that the neck can be protected.

Further, since the flat mat is supported by the flat mat supporting member supported by the seat back,
The structure is simple and the cost can be reduced.

According to the second aspect of the present invention, the flat mat support member is rotatably supported between the two side frames of the seat back frame while being vertically separated from each other, and Since it is supported by the second link member, the state in which the flat mat supporting member is moved to the rear side, that is, the state in which a load enough to overcome the biasing means is applied, is the time of the collision, At this time, the first link member moves the pressure receiving member, and moves the headrest upward and forward via the support means, thereby securely holding the occupant's head and ensuring the neck protection.

According to the third aspect of the present invention, the first
One of the link members is rotatably connected to both side frames of the seat back frame, the other is rotatably connected to the pressure receiving member, and the flat mat support member is provided between the one and the other. Since the flat mat support member is moved rearward, that is, a state in which a load enough to overcome the urging means is applied when the rear-end collision occurs, it is necessary to apply Sometimes, the first link is urged to rotate rearward about one side, so that the other is also moved rearward, so that the pressure receiving member is reliably moved upward and rearward, and By moving the headrest upward and forward via the support means, the head of the occupant is securely held, and neck protection is ensured.

[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]

 REFERENCE SIGNS LIST 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 first link member 16 second link member 17 flat mat support member 18 return spring as urging means 19 flat Mat 20 Coiled spring as elastic means 30 Occupant 30a Occupant's back 30b Occupant's head FR Front RR Rear UP Upper LWR Lower

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 support member is arranged along the side frame, respectively, a flat mat is arranged between the flat mat support members, and between the both side frames and the flat mat support member, The flat mat supporting member is always urged to the front side by interposing an urging means. Between the flat mat supporting member and the flat mat, the flat mat can be moved back and forth and returned to its original position. The elastic means which expands and contracts so as to be able to return is interposed.The urging means does not expand under a sitting load, but only expands under an impact load accompanying a rear-end collision, and moves the flat mat supporting member to move the pressure receiving member. An automobile seat back which can be pressed. 2. The vehicle seat back according to claim 1, wherein the flat mat support member is rotatably supported between both side frames of the seat back frame while being vertically separated from each other. An automobile seat back supported by a first link member and a second link member. 3. The automobile seat back according to claim 2, wherein one of the first link members is rotatably connected to both side frames of the seat back frame, and the other is the other link member. A seat back for an automobile, wherein the seat back is rotatably connected to a pressure receiving member, and the one and the other are rotatably connected to the flat mat support member.