JP2000071835A - Seat back for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a pad from biting the supporting member of a head rest even if rear load from an occupant is applied to a pressure receiving member, and to ensure the operation amount of the head rest sufficiently. SOLUTION: This seat back is constituted of at least a seat back frame, a supporting means 7 journaled to the upper end part of the seat back frame so as to rotate lengthwise, a head rest 3 supported by a supporting means 7, a pressure receiving member 4 which is supported by the lower end part of the supporting means 7 and receives the pressure of an occupant back, and a pad arranged on the front side FR of the pressure receiving member 4. The supporting member 7 is disposed to the central side front the shoulder point of at least an AFO5% tile mannequin when viewed from front side. The pressure receiving member 4 is formed of a rigid body.

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 cervical vertebra of an occupant when the vehicle is collided.

[0002]

2. Description of the Related Art As a conventional seat back of such an automobile, as shown in International Patent Publication No. 98/09838,
A seat back frame (9), support means (5) rotatably supported on the upper end of the seat back frame (9), and stays (27) on the upper end of the support means (5). And a pressure receiving member (10) supported by the lower end of the support means (5) and capable of receiving the pressure on the back of the occupant; It comprises at least an operating link (12) rotatably supported by the back frame (9) and the pressure receiving member (10), respectively, and a pad disposed on the front side of the pressure receiving member (10). .

[0003] For this reason, for example, when the own vehicle is collided, an impact load acts on the seat back (3) toward the front side, and a recoil load by the occupant acts toward the rear side.
That is, the load acts on the back element (20) and the pressure receiving member (10) provided between the seat back frames (9). At this time, the pressure receiving member (10) moves rearward, so that the support means (5) rotates about the upper side (24) of the seat back frame (9) as a rotation fulcrum, and is supported on the upper end thereof. The moved headrest (4) operates in a direction approaching the occupant's head.

[0004] Therefore, even if the seat back (3) flexes rearward due to the recoil load of the occupant when the host vehicle collides, the headrest (4) instantaneously approaches the occupant's head. Is reliably received by the headrest (4) to protect the occupant's neck.

[0005]

However, in such a conventional technique, the horizontal portion (17) of the support means (5) existing on the pressure receiving member (10) is provided with a seat back frame (17). 9) When turning around the upper side part (24) as a turning fulcrum, there is a possibility that it interferes with the occupant's shoulder. That is, as described above, the support means (5) does not rotate, and the headrest (4) may hinder the operation of approaching the occupant's head.

Further, since the pressure receiving member (10) is made of cloth, the pressure receiving member (10) may bend itself, and the load to the rear side of the occupant may not be reliably transmitted, so that the movement of the headrest (4) is slowed down. The amount of operation is reduced, and improvement is required.

The present invention has been made by paying attention to such a conventional technique, and even if a rearward load is applied to the pressure receiving member from an occupant, the pad does not bite into the support member of the headrest. Another object of the present invention is to provide an automobile seat back capable of ensuring a sufficient headrest operation amount.

[0008]

According to a first aspect of the present invention, there is provided a seat back frame, a supporting means rotatably supported on an upper end portion of the seat back frame so as to be able to rotate back and forth, and A headrest supported by an upper end, a pressure receiving member supported by a lower end of the support means and capable of receiving a pressure on the back of an occupant, and rotatably supported by the seat back frame and the pressure receiving member, respectively. And at least a pad disposed on the front side of the pressure receiving member. The support means is arranged at least on the center side of a shoulder point of the AF05% tile mannequin in a front view. The pressure receiving member is formed of a rigid body.

According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the support means is formed in a "<" shape before and after the pressure receiving member. .

According to a third aspect of the present invention, in the vehicle seat back according to the first or second aspect, the support means and the holder of the headrest can be locked off from a rear side. .

[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 5 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, a pad (not shown) formed of polyurethane foam or the like disposed in front of and behind the seat back frame 2, and a skin made of cloth or the like covering the pad. At least formed.

The seat back frame 2 is formed in an inverted U-shape, one of which is longer and the other is shorter (to secure an allowance for mounting an airbag device, not shown), and an upper frame 2a. A substantially symmetrical side frame 2b, 2b 'disposed at a position hanging down from the left and right ends of the frame 2a;
b, 2b 'and an underframe 2c provided between the lower end portions.

Each of the side frames 2b, 2b 'supports a bracket 5, 5' formed in a plate shape by an iron plate. Each of the brackets 5, 5 'has one end 6a, 6a' of an actuation link 6, 6 '.
But front and rear FR, RR by bolt 20 and bush 21
Each is supported so that it can rotate in the direction.
Between the other end portions 6b, 6b 'of the operation links 6, 6', ends 4a, 4a 'of the pressure receiving member 4 described later are rotatably supported by rivets 22 and bushes 21.

Between the spring hooks 23, 23 'of the side frames 2b, 2b' and the operating links 6, 6 ', coiled springs 18, 18 as urging means are arranged. The other end portions 6b and 6b 'of the operation link 6 are constantly biased toward the front side FR.

The pressure receiving member 4 is formed by a rigid body such as an iron plate to extend left and right and is formed in a rectangular shape. An upper side of the armature pipe 7 serving as a support means, which will be described later, is located between the holding portions 8 and 8. A slope portion 9 rising rearward is formed.

At the center of the pressure receiving member 4, a folded portion 10 of the armature pipe 7 is formed flat in the front and rear direction and supported by gas welding.

Below the upper frame 2a, a second frame 28 is supported by welding between the shoulders 2aa and 2aa 'of the upper frame 2a.
A holder bracket 12 is disposed at the center of the second frame 28, and both ends 12a thereof are supported by welding. Armature holders 11, 11 made of synthetic resin are provided inside the support portions 12b, 12b, which project toward the front side at positions spaced apart from the center of the holder bracket 12 to the left and right and have a U-shaped cross section. Be placed. Since the armature holders 11, 11 are supported by the upper ends of the holding portions 8, 8 of the armature pipe 7, the armature holders 11, 11 are supported by the support portions 12b, 12b of the holder bracket 12.
The holding portions 8, 8 of the armature pipe 7 are
Will be retained.

The armature pipe 7 has a substantially U-shape comprising vertical holding portions 8, 8 which are arranged side by side in a right and left direction when viewed from the front, and a folded portion 10 formed at the lower end of the holding portions 8, 8. It is formed in.

The holding portions 8, 8 are arranged at least on the center side of the shoulder point of the AF 05% tile mannequin (SAE) in a front view. The arrangement of the AF 05% tile mannequin (SAE) on the center side of the shoulder point means that the holding parts 8, 8 are arranged inside the shoulder points of most of the occupants 30 of the adult physique. Therefore, even if the occupant 30 receives a load from the front side of the seat back frame 2 due to a rear-end collision of the vehicle, the shoulder of the occupant 30 does not interfere.

Further, the holding portions 8, 8 are formed in a front and rear "U" shape so that the pressure receiving member 4 is disposed in front of the holding members 8, 8 in a side view shown in FIG. Be done.
The bent portion 8a is formed at a position that does not interfere with the lower end of the stay 13 of the headrest 3, and has an inner surface having a radius of 20 mm.

As described above, the stays 13, 13 of the headrest 3 are supported in the holding portions 8, 8 via the armature holders 11, 11 made of synthetic resin so as to be vertically slidable. . Headrest holders 14, 14 made of synthetic resin capable of controlling the vertical position of the stays 13, 13 are held at the upper end portions of the holding portions 8, 8. Reference numeral 14a denotes the headrest holders 14, 1
Reference numeral 15 denotes a frame of the headrest 3.

Reference numeral 16 denotes the side frames 2b, 2b.
An S-shaped spring supported on b ′ via hooks 17 and 17 ′, and arranged at a position below the pressure receiving member 4.

An opening 19 is formed in the rear surface of the holding portion 8. When a tool such as a screwdriver is pushed into the opening 19, the opening 19 is engaged with the opening 19 of the headrest holder 14. The engaging portion 14a is pushed and the opening 19
From the holding portions 8, 8. That is, the headrest holders 14 and 14 can be locked off.

Reference numeral 24 is supported by the upper frame 2a at a position on the rear side RR of the holding portion 8, and prevents the upper end portion of the holding portion 8 from rotating to the rear side RR beyond this position. The first rubber stopper 25 is a frame for hooking a backboard (not shown), and the first stopper 34 is disposed on one side of the holding section 8. The upper end of the holding section 8 has a front side FR.
The second stopper is a wire-shaped second stopper for preventing the rotation of the wire from moving beyond this position.

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

As shown in FIG. 1, the occupant 30
Seat cushion 27, and the seat back 1
In a normal state in which the back 30a is leaned on the back, there is a slight gap A between the headrest 30b of the occupant 30 and the headrest 3,
A slight gap B is formed between the back 30a of the occupant 30 and the pressure receiving member 4. Although a pad or a skin (not shown) is interposed between the back 30 a of the occupant 30 and the pressure receiving member 4, the load from the occupant 30 is not applied to the pressure receiving member 4.

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 or the like moves to the rear side RR, the back 30a of the occupant 30
As a result, the pressure receiving member 4 is pushed toward the rear side RR via a pad or the like. Even if the pad or the like moves rearward due to the load in the rear RR direction by the occupant 30, the occupant 30 is at least the shoulder point of the AF05% tile mannequin. Never dig into it. For this reason, the rise due to the rotation of the holding unit 8 is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.

Further, since the pressure receiving member 4 is formed of a rigid body such as an iron plate, the load in the rear RR direction by the occupant 30 is reliably transmitted to the holding portion 8. That is, the headrest 3 moves immediately when a load is applied to the pressure receiving member 4, so that there is no timing loss. Further, the pressure receiving member 4
Movement amount becomes large.

An operating link 6 supporting the pressure receiving member 4
Is rotationally urged about the bolt 20, and the other end 6b of the operation link 6 is moved from the position shown in FIG. 1 to the position shown in FIG. , Around the bolt 20 in the upper UP and rear RR directions.

Thus, when the other end 6b of the operating link 6 rotates to the upper side UP and the rear side RR, the lower end of the armature pipe 7, that is, the folded portion 10 moves to the upper side UP and the rear side RR. With the movement, the upper end portion of the armature pipe 7, that is, the upper end portions 8b, 8b of the holding portions 8, 8
At the same time, the headrest holders 14, 14 move to the upper side UP and the front side FR. By this movement, the stay 13 of the headrest 3 is also moved to the upper side UP and the front side FR.

Therefore, the holding parts 8, 8, stays 13, 13
Move together around the holder bracket 12.
The headrest 3 supported by the stays 13, 13 comes into contact with the head 30b (thick two-dot chain line) of the occupant 30, as shown in FIG. In FIG. 5, the headrest 3 is illustrated as biting into the head 30b of the occupant 30, but the center of the headrest 3 is concave,
As is well known, the head 30b of the occupant 30 also has a substantially cylindrical shape in cross section, and thus does not bite. Further, the headrest 3 shown in FIG. 5 is indicated by the reference numeral 3 indicated by a two-dot chain line, and the headrest 3 indicated by the two-dot chain line indicates the position of the headrest 3 when it does not move. The head 30b of 30 indicates that it moves as shown by a thin two-dot chain line.

Thus, the upper body of the occupant 30 is moved to the rear side RR.
By moving the headrest 3, the head 30b of the occupant 30 that behaves as if it is left can be reliably held by the movement of the headrest 3. At this time, since the slope 9 rising to the rear side RR is formed on the upper side of the pressure receiving member 4,
The inclined surface 9 of the pressure receiving member 4 can move smoothly along the rear surface of the pad. In other words, it is difficult for the pressure receiving member 4 to bite into the pad.

In this state, since the holding portion 8 is formed in the shape of a “<” in front and rear with respect to the pressure receiving member 4, when the pressure receiving member 4 moves to the rear side RR, FIG. As shown in FIG.
Do not protrude.

The opening 19 on the rear side of the holding portion 8 is provided.
When a tool such as a screwdriver is pressed into the headrest holder 14, the engaging portion 14a engaged with the opening 19 of the headrest holder 14, 14 is pushed away from the opening 19, and the holding portions 8, 8 are held.
It becomes possible to pull out from. That is, the headrest holders 14 and 14 can be locked off.

The headrest holders 14, 1
4, the stays 13, 13 of the headrest 3 are vertically movably supported, so that the headrest 3 can be appropriately adjusted to the position of the head 30b of the occupant 30.

Further, a spring 18 for urging the pressure receiving member 4 toward the front side FR is supported between the operation link 6 and the side frame 2b of the seat back frame 2, so that the back of the occupant 30 is supported. Rear R by 30a
When no pressing force is applied to the R, the spring 18
Accordingly, the pressure receiving member 4 is on the front side FR. That is, the holding portion 8 of the armature pipe 7 supporting the pressure receiving member 4 at the lower end,
Since the headrest 3 supported on the upper end of the head 8 is located at the rear side RR according to the seesaw principle, the comfort of the occupant 30 is not impaired.

The armature pipe 7 has a holding portion 8,
The present invention is not limited to the embodiment in which the U-shape is formed by the folded portion 8 and the folded portion 10. For example, the lower end portions of the holding portions 8, 8 are supported by welding to the pressure receiving member 4 as they are without the folded portion 10. There may be.

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.

[0041]

According to the first aspect of the present invention, the support member is arranged at least in the center of the shoulder point of the AF05% tile mannequin in a front view, so that the load applied to the rear side by the occupant can be obtained. Therefore, even if the pad moves rearward, the occupant's shoulder point is at least the shoulder point of the AF05% tile mannequin, so that the pad does not bite into the support member.
For this reason, the rise accompanying the rotation of the support member is not hindered, and the operation amount of the headrest can be sufficiently secured.

Further, since the pressure receiving member is formed of a rigid body, the load in the rearward direction by the occupant is reliably transmitted. That is, the headrest moves immediately when a load is applied to the pressure receiving member, so that there is no timing loss. In addition, the amount of movement of the pressure receiving member increases.

According to the second aspect of the present invention, since the supporting means is formed in a "-" shape before and after the pressure receiving member, when the pressure receiving member moves rearward,
The pressure receiving member does not protrude behind.

According to the third aspect of the present invention, the headrest holder supporting the headrest can be easily removed by locking off from the rear side of the support means.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a perspective view showing a main part of FIG. 1;

FIG. 4 is a sectional view showing a relationship among a headrest, an armature pipe, a pressure receiving member, and an operation link in FIG. 1;

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

[Explanation of symbols]

 Reference Signs List 1 seat back 2 seat back frame 2a upper frame of seat back frame 2b side frame of seat back frame 3 headrest 4 pressure receiving member 6 operating link 6a one end of operating link 6b other end of operating link 7 armature pipe as supporting means 8 Armature pipe holding section 13 Headrest stay 30 Crew 30a Crew back 30b Crew head FR Front RR Rear UP Upper LWR Bottom

Claims (3)

[Claims] 1. A seat back frame, supporting means supported at an upper end of the seat back frame so as to be rotatable back and forth, a headrest supported at an upper end of the supporting means, and the supporting means A pressure-receiving member supported by the lower end of the occupant and capable of receiving pressure on the occupant's back;
In an automobile seat back comprising at least an operating link rotatably supported by each of the seat back frame and the pressure receiving member and a pad disposed on the front side of the pressure receiving member, the support means may include: A seat back for an automobile, wherein the pressure receiving member is arranged at a center side of a shoulder point of at least an AF05% tile mannequin in a front view, and the pressure receiving member is formed of a rigid body. 2. The vehicle seat back according to claim 1, wherein the support means is formed in a “<” shape before and after the pressure receiving member. Seat back. 3. The automobile seat back according to claim 1, wherein the support means and the holder of the headrest can be locked off from a rear side. Seat back.