JP2000217661A - Seat back for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a foreign object feeling due to a member to support a pressure receiving member from being applied to a passenger's side even if the pressure receiving member moves to the rear side when a load to the rear side of the passenger is applied, and in addition, reduce the cost by simplifying the structure. SOLUTION: Respective end sections 16a, 16a', 16b and 16b' of link members 16, 16' which are formed into a Z-shape by bending, are rotatably supported at a location which is between the side end section of a pressure receiving member 6 which becomes movable when receiving the pressure of the back of a passenger at the time of a running-in, and the side end sections 2b and 2b of a seat back frame 2, and at the same time, for which the side end sections 2b and 2b' of the seat back frame 2 are excluded.

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 vehicle is collided, an impact load is applied to the seat back (3) toward the front first, and then a reaction load due to a secondary collision by the occupant. Acts toward the back. That is, the back element (2) erected between the seat back frames (9)
0) and the pressure receiving member (10). At that time, the pressure receiving member (10) moves rearward,
When the lower end of the support means (5) moves rearward and upward, the headrest (4) supported by the upper end of the support means (5) is moved to the upper side (2) of the seat back frame (9).
4) With the rotation fulcrum as a pivot point, it pivots forward and moves upward to operate in a direction approaching the occupant's head.

[0004] Therefore, with this configuration, when the own vehicle is collided, the seat back (3) is caused by the recoil load of the occupant.
The headrest (4) instantaneously approaches the occupant's head even if is bent backward, so that the occupant's head is securely received by the headrest (4), and the occupant's cervical spine is protected. .

[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 a first aspect of the present invention, there is provided a seat back frame having a substantially vertical shape which is supported by an upper end portion of the seat back frame so as to be rotatable back and forth and movable up and down. A support means, a headrest disposed at an upper end of the support means, and a rear end supported by the lower end of the support means and moved rearward by receiving pressure from a back of an occupant due to a secondary collision at the time of a rear-end collision; A vehicle seat back comprising at least a pressure receiving member capable of being pressed and a biasing means for biasing the pressure receiving member toward the front side, wherein a side end of the pressure receiving member and a side end of the seat back frame. Each end of a link member formed in a Z-shape is rotatably supported at a position between the first and second portions and at a position other than a side end of the seat back frame.

According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the pressure receiving member covers a lower end portion of the support means from a front-rear direction, so that a rear surface is formed. It has a cushioning function for rear passengers.

According to a third aspect of the present invention, there is provided the vehicle seat back according to the first or second aspect, wherein the pressure receiving member covers a lower end portion of the support means from a front-rear direction, thereby providing a front side. A sliding surface is formed such that the upper end of the surface can slide on the rear surface of the pad arranged on the front side of the pressure receiving member.

According to a fourth aspect of the present invention, there is provided an automobile seat back according to any one of the first to third aspects,
The urging means includes a coiled spring suspended between a side end of the seat back frame and the link member.

[0011]

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 7 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, a plurality of S-shaped springs 11 bridged between side frames 2b and 2b 'of the seat back frame 2 described below, and an S-shaped spring. At least a pad 12 is disposed before and after 11 and formed of polyurethane foam or the like, and a skin 13 made of cloth or the like that covers the pad 12.

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 the rear side RR, and is hung down from left and right ends of the upper frame 2a. Frame (side end portion) 2 which is arranged in a substantially symmetrical shape and arranged at
b, 2b 'and an underframe 2c spanned between lower ends of the side frames 2b, 2b'.
Mutually supported by welding SW.

On the front FR surface of the back member 4, 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 at an appropriately spaced position. Be arranged.

Reference numeral 6 denotes an occupant 3 associated with a secondary collision described later.
0, the lower end 7 of the armature pipes 7, 7 is a block-shaped pressure receiving member pressed against the rear side RR.
Holes 6ca, 6ca into which b, 7b are inserted are formed on the upper surface 6c, and the lower ends 7b, 7 are provided in the holes 6ca, 6ca.
By inserting b, the lower ends 7b, 7b are covered from the front-back direction. The lower hole 6aa of the screw 14 is formed in the surface 6a of the rear side RR.
The pressure receiving member 6 is fixed to the lower end portions 7b, 7b by screwing into the b, 7b. At the upper end 6ba of the front surface 6b of the pressure receiving member 6, a sliding surface slidable with respect to the rear surface 12a of the pad 12 disposed on the front side FR of the pressure receiving member 6 is formed. The pressure receiving member 6 is located at a position facing the back 30a of the occupant 30, so that the pressure receiving member 6 is easily pressed. The pressure receiving member 6 is formed in a rectangular shape extending right and left by a rigid body such as an iron plate.

The holding part 5 of the armature holder 5
Since a ring (not shown) made of synthetic resin is built in each of the insides a and 5a, no rubbing noise or the like occurs when the armature pipes 7 move.

The armature pipes 7, 7 are arranged side by side on the left and right as viewed from the front, and form a vertical shape. The holding position of the armature pipes 7, 7 is at least AF0 in the front view.
It is arranged on the center side of the shoulder point of the 5% tile mannequin (SAE). This means that the armature pipes 7, 7 are arranged inside the shoulder points 31 of most of the occupants 30 of the adult physique. Therefore, even if the occupant 30 is pressed against the seat back 1, the shoulder point 31 of the back 30a of the occupant 30 does not interfere with the armature pipes 7, 7.

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

As described above, the headrest holders 9, 9 which support the stays 8, 8 of the headrest 3 so as to be vertically slidable are provided in the upper end portions 7c, 7c of the armature pipes 7, 7, respectively. Be arranged.

Reference numeral 10 denotes the seat back frame 2.
The stopper 10 is made of a rubber material and held so as to determine the positions of the rear surfaces of the armature pipes 7 and 7.

Between the both ends of the pressure receiving member 6 and the side frames 2b, 2b 'of the seat back frame 2,
At positions other than b and 2b ', as shown in FIGS. 1 and 4,
The respective ends 16a, 16a ', 16b, 16b' of the link members 16, 16 'bent in a Z-shape are rotatably supported. That is, the link members 16, 1
One end portions 16a and 16a 'of the pressure receiving member 6 are rotatably supported by left and right ends of the pressure receiving member 6, and the link members 16 and 16'.
The other end portions 16b and 16b 'of the seat back frame 2 are connected to the flanges 2ba and 2ba of the side frames 2b and 2b' of the seat back frame 2, respectively.
2ba 'is supported via brackets 17,17. The bracket 17 is provided with a bracket 17 on the rear RR surface of the side frames 2b, 2b 'of the seat back frame 2, and the flanges 2ba, 2b.
Nut 19 supported by welding to ba '
Are supported by the flanges 2ba and 2ba '.

One end 16 of the link members 16, 16 '
a, 16a 'and the other end portions 16b, 16b' are supported by the side end portions of the pressure receiving member 6 and the side frames 2b, 2b 'of the seat back frame 2, respectively. Side frame 2b,
At positions other than 2b ', that is, at positions not interfering with the side flanks 30c of the occupant 30, they are bent in a Z-shape.

One end 16 of the link members 16, 16 '
a, 16a 'and the side frames 2b, 2b' of the seat back frame 2, the pressure receiving member 6 is fixed to a predetermined position, that is, the armature pipe 7
A return spring (biasing means) that is a coil-shaped spring that is biased so as to hold the headrest 3 connected via the head at a neutral position (the position shown in FIG. 2).
By suspending 20, the pressure receiving member 6 is urged toward the front side FR.

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

As shown in FIG. 2, when the occupant 30 is seated on a seat cushion (not shown) of the seat, the back 30a rests on the seat back 1 and is supported by the S-shaped spring 11, 30 heads 3
0b and the headrest 3 have a slight gap 32, and a small gap 33 is formed between the back 30a of the occupant 30 and the pressure receiving member 6. Although the pad 12 and the skin 13 are interposed between the back 30 a of the occupant 30 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 side RR due to the secondary collision and the pad 12 moves to the rear side RR, the back 3 of the occupant 30
0a causes the pressure receiving member 6 to move through the pad 12 and the like to the rear side R.
It is pushed by R. Even if the pad 12 or the like moves to the rear RR due to the load in the rear RR direction by the occupant 30, the horizontal distance between the shoulder points 31 of the occupant 30 is at least the same as the horizontal distance between the shoulder points by the AF05% tile mannequin. Therefore, the pad 12 and the like do not cut into the armature pipe 7. 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.

The pressure receiving member 6 includes link members 16 and 16 '.
When the pressure receiving member 6 is pushed by the rear side RR and moves, the link members 16 and 16 ′ are moved to the other end 1.
6b, 16b ', the rear RR and the upper U
It is rotated to P. Due to the rotation, the headrest holders 9, 9 supported by the upper end 7 c of the armature pipe 7 move the upper side U around the armature holder 5.
It approaches P and front FR. 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.

When the armature pipe 7 moves,
The lower end portions 7b, 7b of the armature pipe 7 are covered with the pressure receiving member 6, so that the rear side RR surface 6
"a" has a cushioning function for a rear passenger (not shown).
Further, since the upper end 6ba of the front surface 6b is slidable with respect to the rear surface 12a of the pad 12 disposed on the front side FR of the pressure receiving member 6, the pad 12 can be smoothly moved on the rear surface 12a.

The pressure receiving member 6 is located at a position other than the end portions 16a, 16a 'of the link members 16, 16' supported by the side frames 2b, 2b 'of the seat back frame 2, that is, the side flap 30c of the occupant 30. When the pressure receiving member 6 is moved to the rear side RR due to the load applied to the rear side RR of the occupant 30, the support member 16 is supported by the link members 16 and 16 'rotatably disposed at a position not interfering with the
Since it does not interfere with the link members 16 and 16 ′ supporting the pressure receiving member 6, no foreign-body sensation is given to the side of the occupant. Further, the cost can be reduced by simplifying the structure.

As described above, the headrest holders 9, 9 are arranged such that the upper UP
Further, since the headrest 3 is supported by the stays 8, 8, the headrest 3 supported by the stays 8, 8, as shown in FIG.
Abuts on the head 30b. In FIG. 7, the headrest 3 is illustrated as biting into the head 30b of the occupant 30, but the center of the headrest 3 is depressed in the left and right directions, and the head 30b 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.

The return spring 20 is a coiled spring suspended between the side frames 2b, 2b 'of the seat back frame 2 and the link members 16, 16', so that the pressure receiving member 6 moves. As a result, the return spring 20 avoids the flank 30c of the occupant 30 and reduces the foreign object sensation by the occupant 30.
Is not given to the flank 30c.

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, the position between the side end of the pressure receiving member and the side end of the seat back frame and the position excluding the side end of the seat back frame; In other words, at a position that does not interfere with the passenger's flanks,
Since each end of the link member formed to be bent in the shape of a letter is rotatably supported, when the load on the rear side of the occupant is applied and the pressure receiving member moves rearward, the pressure receiving member is supported. Since it does not interfere with the link member, no foreign-body sensation is given to the side of the occupant. Further, the cost can be reduced by simplifying the structure.

According to the second aspect of the present invention, since the pressure receiving member covers the lower end portion of the support means from the front-rear direction, the rear surface has a cushioning function for a rear occupant. Even if a rear occupant who moves to the front side at the time of a rear collision interferes with the front seat, the rear surface of the pressure receiving member is buffered,
There is no risk of rear seat occupants being damaged.

According to the third aspect of the present invention, the pressure receiving member covers the lower end portion of the support means in the front-rear direction, so that the upper end of the front surface is disposed on the front side of the pressure receiving member. Since the sliding surface that can slide with respect to the rear surface is formed, the pressure receiving member can smoothly move the rear surface of the pad as the occupant moves rearward, so that the movement of the pressure receiving member does not get stuck In addition, the headrest can be moved reliably and promptly.

According to the fourth aspect of the present invention, the urging means is a coiled spring suspended between the side end of the seat back frame and the link member. The spring that is pulled by moving is
Since the side of the occupant is avoided, a foreign body sensation is not given to the occupant's side.

[Brief description of the drawings]

FIG. 1 is a front view showing the periphery of a frame of a seat back according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line SA-SA of FIG. 1;

FIG. 3 is a sectional view taken along the line SB-SB in FIG. 1 and excluding a supporting means;

FIG. 4 is a perspective view around a frame of a seat back excluding a headrest in FIG. 1;

FIG. 5 is an exploded perspective view of a support section of the link member of FIG. 14;

FIG. 6 is a perspective view showing a main part from obliquely above in FIG. 1;

FIG. 7 is a sectional view showing the operation embodiment of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat back 2 Seat back frame 2a Upper frame 2b Side frame (side end part) 3 Headrest 5 Armature holder 6 Pressure receiving member 6a Rear surface 6b Front surface 6c Upper surface 7 Armature pipe as support means 7b Lower end portion 7c Upper end portion 8 Stay 9 Headrest holder 16 Link member 20 Return spring (biasing means) 30 Occupant 30a Occupant's back 30b Occupant's head 30c Occupant's flank FR Front RR Rear side UP Upper side LWR Lower side

Claims (4)

[Claims] 1. A seat back frame, a substantially vertical supporting means rotatably movable back and forth at the upper end of the seat back frame and movably up and down, and disposed at an upper end of the supporting means. A pressure receiving member that is supported by the lower end of the support means and that can be moved rearward by receiving the pressure of the occupant's back due to a secondary collision at the time of a rear-end collision; and An automotive seat back comprising at least biasing means for biasing, between the side end of the pressure receiving member and the side end of the seat back frame, and at the side of the seat back frame. An automobile seat back, wherein each end of a link member formed in a Z-shape is rotatably supported at a position excluding the end. 2. The vehicle seat back according to claim 1, wherein the pressure receiving member covers a lower end portion of the support means from a front-rear direction, so that a rear surface is provided to a rear seat occupant. An automobile seat back having a buffer function. 3. The vehicle seat back according to claim 1, wherein the pressure receiving member covers a lower end portion of the support means from a front-rear direction so that an upper end portion of a front surface is formed. A seat back for an automobile, wherein a sliding surface slidable with respect to a rear surface of a pad arranged on a front side of a pressure receiving member is formed. 4. The vehicle seat back according to claim 1, wherein the urging means is suspended between a side end of the seat back frame and the link member. An automobile seat back comprising a coiled spring.