JP2001058533A - Seat back for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back in which riding comfort is improved and in which a sufficient amount of action is secured even if the amount of invasion that is added to a pressure member from a crewman is small. SOLUTION: A seat back is composed of a seat back frame 2, a headrest holder bracket 14 that is supported by an upper end of the seat back frame 2 free of rotation back and forth, a headrest 3 which is supported by an upper end of the headrest holder bracket 14, a pressure member 8 that is supported by a lower end of the headrest holder bracket 14 and also can receive the pressure of crewman's back, and an actuation link 6 that is axially supported and universally coupled by the seat back frame 2 as well as the pressure member 8 and the actuation link 6 consists of a rotating part 7 with the seat back frame 2 is positioned in the rear side, an arc-shaped long groove 11 that has the arc center in the front side, and the pressure member 8 is latched and supported in the long groove 11 of the actuation link 6.

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), a headrest holder bracket (5) supported on the upper end of the seat back frame (9) to be rotatable back and forth, and a stay at an upper end of the headrest holder bracket (5). (2
7) a headrest (4) supported up and down so as to be movable up and down, and a pressure receiving pressure supported by an operating link (12) at the lower end of the headrest holder bracket (5) and capable of receiving pressure on the back of the occupant. A member (10), the seat back frame (9), and the pressure receiving member (1);
0) An operating link (1) rotatably supported on each
2) and at least.

[0003] For example, when the own vehicle is collided, an impact load is applied to the seat back (3) toward the front side, and a secondary collision load (reaction load) by the occupant is applied to the rear side. Act. 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 (1
0) moves rearward, the headrest holder bracket (5) pivots about the upper side (24) of the seat back frame (9) as a pivot, and the headrest (4) supported at the upper end thereof. ) Operates in the 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 reliably received by the headrest (4) to protect the occupant's neck.

[0005]

However, in such a conventional technique, since the operating link (12) of the pressure receiving member (10) has the rotating portion (13) on the front side, the seated occupant can be seated. The rotating part (13) gives a foreign-body sensation to the flanks of the user, which may impair the merchantability.

The pressure receiving member (10) cannot move unless the amount of intrusion by the occupant's waist is large. However, there is a pad disposed in front of the pressure receiving member (10), and a large amount of intrusion can be expected. However, an improvement is required in the operation amount of the headrest (4).

The present invention has been made by paying attention to such a conventional technique, and it is possible to improve the riding comfort and to secure a sufficient amount of operation of the headrest even if the amount of intrusion from the occupant applied to the pressure receiving member is small. The present invention provides a vehicle seat back that can be used.

[0008]

According to a first aspect of the present invention, there is provided a seat back frame, and a vertically long headrest holder bracket supported on an upper end portion of the seat back frame so as to be rotatable back and forth. A headrest supported by an upper end portion of the headrest holder bracket, a pressure receiving member supported by a lower end portion of the headrest holder bracket and capable of receiving pressure on the back of an occupant; the seat back frame and the pressure receiving member In an automobile seat back comprising at least an operation link rotatably supported on a vehicle, the operation link has a rotating portion with the seat back frame on the rear side and an arc center on the front side. An arc-shaped long groove having a front side is formed, and the pressure receiving member It formed by engaged and supported in the groove.

According to the first aspect of the present invention, since the rotating portion of the operating link is on the rear side, the riding comfort is improved without touching the flank of the occupant, and the merchantability is excellent.
In addition, when the pressure receiving member moves in the long groove having the arc center on the front side, when the operation link moves, the pressure receiving member moves along the long groove more than the movement amount of the operation link. Greatly increased to allow better protection of the occupant's neck.

According to a second aspect of the present invention, there is provided the automobile seat back according to the first aspect, wherein the operating link is
In a state before the operation, the longitudinal direction of the long groove is arranged up and down.

According to the second aspect of the present invention, the operating link in the state before the operation does not protrude to the occupant side and does not stimulate the occupant's flanks.

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 operating link has a long groove connecting portion with the pressure receiving member before operation. It is located at the lowermost end, and the position of the rotating part is located further below the lowermost end of the long groove.

According to the third aspect of the invention, when a secondary collision load is applied to the pressure receiving member, the operating link is likely to rotate around the rotating portion, and the arc of the long groove is also centered on the front side. Because it is a circular arc, with respect to the direction of the load,
The pressure receiving member is arranged in a direction that is easier to rotate.

[0014]

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 3 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 includes an upper frame 2a formed in a box shape, and a substantially left-right symmetric side frame 2b disposed at a position suspended from the left and right ends of the upper frame 2a. 2b ',
An under frame 2c is provided between the lower ends of the side frames 2b and 2b '.

A round bar-shaped link support member 4 is provided between the side frames 2b and 2b '.
The link support member 4 is provided with rotating portions 7, 7 'on the rear side RR of the triangular operating links 6, 6'.
Each is supported so as to be rotatable in the RR direction. On the front side FR of each of the operation links 6 and 6 ', a long groove 11 is formed in which left and right ends 8a and 8a' of a pressure receiving member 8 described later are movably supported by rivets 9 and bushes 10. In the state before the operation shown in FIG. 1, the position where the rivet 9, which is the connecting portion with the pressure receiving member 8, is located at the lowermost end 11 a of the long groove 11. The position of the rotating parts 7, 7 '
The long groove 11 is located at a position LWR further below the lowermost end portion 11a. The end 6a of the front link FR of the actuation link 6, 6 '
A coil spring 35 for urging the operating links 6, 6 'toward the front FR is suspended between the side frames 2b, 2b'. The coil spring 35 has a spring constant that extends only by a load accompanying a secondary collision of an occupant.

The long groove 11 is formed in an arc shape having a rotation center on the front side FR in a state before the operation shown in FIG. 1, and in the same state shown in FIG.
Are set in a long vertical relationship.

S-shaped springs 13, 13 are arranged between the spring hooks 12, 12 'which are arranged inside the side frames 2b, 2b' to face each other.

The pressure receiving member 8 is formed in a rectangular shape by extending it to the left and right by a rigid body such as an iron plate, and has an inclined portion 15 rising rearward on an upper side located between the headrest holder brackets 14 described later. Is formed.

The headrest holder bracket 14,
14 are arranged side by side left and right in a front view, and at least an AF05% tile mannequin (SAE) in a front view
Is located on the center side of the shoulder point. AF
It is located on the center side of the shoulder point of the 05% tile mannequin (SAE), which means that the headrest holder brackets 14, 14 are located inside the shoulder points of most occupants of adult physique. Therefore, even if the occupant receives a load from the front side of the seat back frame 2 due to the collision of the vehicle, the shoulder of the occupant does not interfere.

Further, the headrest holder brackets 14, 14 are arranged such that the pressure receiving member 8 is viewed from the side as shown in FIG.
Are formed in a front and rear “U” shape so as to be disposed on the front side FR from the headrest holder brackets 14, 14. The bent portion 14a is formed at a position where the bent portion 14a does not interfere with the lower end portion 16a of the stay 16 of the headrest 3, and has an inner surface having a radius of 20 mm.

The headrest holder bracket 1
At the upper end of the headrest 3, the stay 1 of the headrest 3 is provided via armature holders 17, 17 made of synthetic resin.
6 and 16 are supported so as to be slidable up and down and stop at an appropriate position.

Reference numeral 18 denotes a headrest holder bracket 1 supported by the upper frame 2a at a position RR behind the headrest holder brackets 14, 14.
Upper end portions of the rubber stoppers 4 and 14 are rubber stopper members for preventing the rotation to the rear side RR from going beyond this position.

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

As shown in FIG. 1, when the occupant is seated on a seat cushion of a known seat having the seat back 1 and leans against the back of the seat back 1, the occupant's head and the headrest 3 And a slight gap is formed between the back of the occupant and the pressure receiving member 8. Although a pad or a skin (not shown) is interposed between the back of the occupant and the pressure receiving member 8, the load from the occupant is not applied to the pressure receiving member 8. The back of the occupant can be held by the S-shaped spring 13 in a state of satisfying the riding comfort.

In this state, when the own vehicle is collided and the seated occupant is pushed by the rear side RR due to the secondary collision and the pad or the like moves to the rear side RR, pressure is received by the back of the occupant through the pad or the like. The member 8 is moved to the rear side RR while extending the coil spring 35. Even if the pad or the like moves rearward due to the load on the rear side RR by the occupant, the pad or the like may bite into the headrest holder brackets 14 and 14 because the shoulder point of the occupant is at least the shoulder point of the AF05% tile mannequin. There is no. For this reason, the elevation due to the rotation of the headrest holder brackets 14, 14 is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.

Further, since the pressure receiving member 8 is formed of a rigid body such as an iron plate, the load in the rear RR direction by the occupant is transmitted to the headrest holder brackets 14, 14 without fail. That is, the headrest 3 moves as soon as a load is applied to the pressure receiving member 8, so that there is no timing loss. In addition, the amount of movement of the pressure receiving member 8 increases.

The operating link 6 supporting the pressure receiving member 8
Is rotated about the rotating part 7 and the front side F of the operation link 6
When the end 6a of the R is moved from the position shown in FIG. 1 to the position shown in FIG. 3, the end 6a of the operating link 6 rotates around the rotating portion 7 in the upper UP and rear RR directions. Is done.

When the end 6a of the operation link 6 rotates upward UP and rearward RR, the lower end of the headrest holder brackets 14, 14, ie, the pressure receiving member 8, moves upward UP and rearward RR. With the movement, the headrest 3 together with the upper end portions of the headrest holder brackets 14 and 14 are moved to the upper side UP and the front side FR. Therefore, the headrest 3 comes into contact with the occupant's head as shown in FIG.

In this way, the upper body of the occupant moves to the rear side RR, so that the head of the occupant who remains can be reliably held by the movement of the headrest 3. At this time, the slope 15 rising to the rear side RR is formed on the upper side of the pressure receiving member 8, so that the slope 15 of the pressure receiving member 8 can move smoothly along the rear surface of the pad. In other words, it is difficult for the pressure receiving member 8 to bite into the pad.

In this state, since the headrest holder brackets 14 and 14 are formed in a "-" shape before and after the pressure receiving member 8, when the pressure receiving member 8 moves to the rear side RR, As shown in FIG.
Does not protrude to the rear side RR.

The headrest holders 14, 1
4, the stays 16, 16 of the headrest 3 are supported so as to be able to move up and down, so that the headrest 3 can be appropriately adjusted to the position of the head of the occupant.

A coil spring 35 is provided between the operating link 6 and the side frame 2b of the seat back frame 2 to urge the pressure receiving member 8 toward the front side FR.
Is supported, the coil spring 3 is kept in a state in which no pushing force is applied to the rear side RR by the occupant's back.
5, the pressure receiving member 8 is on the front side FR. That is, the headrest 3 supporting the pressure receiving member 8 at the lower end comes into contact with the head of the occupant, as shown in FIG. Headrest 3 supported on upper ends of headrest holders 14, 14
Fits in the rear RR position according to the seesaw principle, and does not impair the occupant's livability.

In the above description of the operation, it is assumed that the head of the occupant is securely held by the movement of the headrest 3, but the movement of the headrest 3 and the movement of the seat back 1 are relative. Even if the seat back 1 moves to the rear side RR due to the back of the occupant, the headrest 3 does not move with respect to the occupant's head, and is held at that position, thereby protecting the occupant's head. It also includes those described.

[0037]

According to the first aspect of the present invention, since the rotating portion of the operating link is on the rear side, the occupant does not touch the flank of the occupant, the riding comfort is improved, and the merchantability is excellent. In addition, when the pressure receiving member moves in the long groove having the arc center on the front side, when the operation link moves, the pressure receiving member moves along the long groove more than the movement amount of the operation link. Greatly increased to allow better protection of the occupant's neck.

According to the second aspect of the present invention, the operating link in the state before the operation does not protrude to the occupant side and does not stimulate the occupant's flanks.

According to the third aspect of the invention, when a secondary collision load is applied to the pressure receiving member, the operating link is likely to rotate around the rotating portion, and the arc of the long groove is also centered on the front side. Because it is a circular arc, with respect to the direction of the load,
The pressure receiving member is arranged in a direction that is easier to rotate.

[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 perspective view of FIG. 1;

FIG. 3 is a sectional view after the operation of FIG. 1;

[Description of Signs] 1 Seat back 2 Seat back frame 2a Upper frame of seat back frame 2b Side frame of seat back frame 3 Headrest 4 Link support member 6 Working link 6a End of working link 7 Rotating part 8 Pressure receiving member 11 Long groove 13 S-shaped spring as biasing means 14 Headrest holder bracket 16 Headrest stay FR Front side RR Rear side UP Upper side LWR Lower side

Claims (3)

[Claims] 1. A seatback frame, a vertically long headrest holder bracket supported on an upper end of the seatback frame so as to be rotatable back and forth, and supported by an upper end of the headrest holder bracket. A headrest, a pressure receiving member supported by a lower end portion of the headrest holder bracket and capable of receiving pressure on the back of an occupant; and an operating link rotatably supported by the seat back frame and the pressure receiving member, respectively. In the automobile seat back having at least a configuration, the operating link is provided with a rotating portion with the seat back frame on the rear side and an arc-shaped long groove having an arc center on the front side on the front side. The pressure receiving member is engaged and supported in a long groove of the operation link. Automotive seat back that. 2. The vehicle seat back according to claim 1, wherein the operation link is arranged so that a longitudinal direction of the long groove is up and down in a state before operation. For seat back. 3. The automobile seat back according to claim 1, wherein, in a state before the operation, the connection portion between the operation link and the pressure receiving member is located at a lowermost end of the long groove. A seat back for an automobile, wherein the position of the rotating portion is further below the lowermost end of the long groove.