JP2000052830A - Vehicle seat back - Google Patents

Abstract

(57) [Summary] [Problem] To provide a seat back for a vehicle in which even if a rear load from an occupant is applied to a pressure receiving member, a pad does not bite into an armature and a sufficient amount of operation of a headrest can be secured. SOLUTION: A seat back frame 2, an armature 4 pivotally supported on an upper end portion of the seat back frame 2 so as to be rotatable back and forth, a headrest 3 supported by the armature 4, and the armature 4 Pressure-receiving member 5 supported by the vehicle and capable of receiving pressure on the back of the occupant
And a pad 7 arranged in front of the pressure receiving member 5. The armature 4 is formed in a substantially U-shape by a vertical portion 10 that is arranged side by side in a right and left direction when viewed from the front, and a folded portion 11 that is formed at a lower end of the vertical portion 10. The pressure receiving member 5 is fixed to the folded portion 11.

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 in a collision.

[0002]

2. Description of the Related Art A conventional seat back of an automobile is disclosed in Japanese Patent Application Laid-Open No. Hei 7-291005. An armature pivotally supported so as to be freely movable, a headrest supported at an upper end of the armature, a pressure receiving member supported at a lower end of the armature and capable of receiving pressure on an occupant's back; and It comprises at least an operating link rotatably supported on each of the back frame and the pressure receiving member, and a pad disposed on the front side of the pressure receiving member.

[0003] For this reason, for example, when the own vehicle is collided, an impact load is applied to the seat toward the front, and the load of the occupant is suspended between the seat back frames toward the rear by the reaction. Acts on the S spring. At that time, since a load equal to or more than a predetermined value is applied to the pressure receiving members located at both ends of the S spring,
The pressure receiving member moves rearward, and can prevent the occupant's entire body from leaning backward to some extent. In addition, when the pressure receiving member moves rearward, the armature rotates around the upper side of the seat back frame as a rotation fulcrum, and the headrest supported at the upper end thereof moves closer to the head of the occupant.

[0004] Therefore, when the own vehicle is collided, the occupant is prevented from being lifted obliquely rearward, and the headrest is instantly moved closer to the occupant's head. As a result, the occupant's neck is protected.

[0005]

However, in such a conventional technique, a pad disposed on the front side of the armature is pressed against the occupant by a horizontal portion of the armature existing on the pressure receiving member. The armature may bite and hinder the upward movement accompanying rotation of the armature itself.

Further, if the upward movement caused by the rotation of the armature itself is hindered, the amount of movement of the occupant to the rear side is hindered, and the amount of pushing the pressure receiving member to the rear side is eventually reduced. The amount will be reduced,
Improvement is required.

The present invention has been made by paying attention to such a conventional technique, and even if a rear load from an occupant is applied to the pressure receiving member, the pad does not bite into the armature and the headrest can be sufficiently operated. An object of the present invention is to provide a vehicle seat back capable of securing a sufficient amount.

[0008]

According to a first aspect of the present invention, there is provided a seat back frame, an armature pivotally supported on an upper end portion of the seat back frame so as to be rotatable back and forth, and an upper end of the armature. A headrest supported by the armature, a pressure-receiving member supported by the lower end of the armature and capable of receiving pressure on the back of an occupant, and rotatably supported by the seatback frame and the pressure-receiving member, respectively. A vehicle seat back including at least an operation link and a pad disposed on a front side of the pressure receiving member. The armature is formed in a substantially U-shape by a vertical part formed in a left and right juxtaposition in a front view and a folded part formed at a lower end of the vertical part. The pressure receiving member is fixed to a folded portion of the armature.

According to a second aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the pressure receiving member has an upper side formed with a slope rising rearward.

A third aspect of the present invention is the vehicle seat back according to the first or second aspect, wherein the armature is formed in a hollow shape. A holder is supported on the upper end of the armature in the vertical direction. The holder supports the stay of the headrest so as to be vertically movable.

According to a fourth aspect of the present invention, there is provided the vehicle seat back according to any one of the first to third aspects, wherein the operating link and the seat back frame are provided between the operating link and the seat back frame.
An urging means for urging the pressure receiving member forward is supported.

[0012]

According to the first aspect of the present invention, the armature has a vertical portion, which is arranged left and right in a front view, on the pressure receiving member. In other words, since the pressure receiving member is fixed to the folded portion at the lower end of the armature, even if the pad is pushed backward by the occupant,
The pad does not cut into the armature. For this reason,
The rise due to the rotation of the armature is not hindered, and the operation amount of the headrest can be sufficiently secured.

According to the second aspect of the present invention, the pressure receiving member is formed with a slope rising rearward on the upper side thereof, so that the inclined surface of the pressure receiving member can move smoothly along the rear surface of the pad. . In other words, it is difficult for the pressure receiving member to bite into the pad.

According to the third aspect of the present invention, when the armature is moved by the pressure receiving member, the headrest is movable via the holder supported on the upper end of the hollow vertical portion of the armature. In addition, since the stay of the headrest is supported by the holder so as to be movable up and down, the headrest can be appropriately adjusted to the position of the head of the occupant.

According to the fourth aspect of the present invention, the urging means for urging the pressure receiving member forward is supported between the operating link and the seat back frame. In a state in which the rearward pressing force is not applied, the pressure receiving member is on the front side by the biasing means. That is, the headrest supported at the upper end of the armature supporting the pressure receiving member at the lower end is located at a rear position according to the seesaw principle, so that the occupant's livability is not impaired.

[0016]

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 DW is a lower side.

FIGS. 1 to 4 show an embodiment of the present invention. An automobile seat back 1 includes a seat back frame 2 and a headrest 3.

The seat back frame 2 is fixed to an upper frame 2a, side frames 2b, 2b hanging from left and right ends of the upper frame 2a, and lower ends of the side frames 2b, 2b. It consists of an under frame 2c.

On the side frames 2b, 2b, one end 6a of an operating link 6 formed in a plate shape by an iron plate is connected to the front and rear F by a bolt 20 or the like.
They are supported to be rotatable on the R and RR sides, respectively. An end 5 a of the pressure receiving member 5 is rotatably supported by a pin 21 between the other ends 6 b of the operation link 6.

A coil-shaped spring 8 is disposed between the side frames 2b, 2b and the operating links 6, 6, and the other end 6b of the operating link 6 is moved forward. FR is always energized.

The pressure receiving member 5 is formed in a rectangular shape extending left and right by an iron plate, and a bead portion 5b is formed around the pressure receiving member 5 to improve the strength of the member and to further describe the upper side of the center. On the upper side of the armature 4 at a position between the vertical parts 10 and 10 to be described later, a slope 12 that rises rearward is formed.

At the center of the pressure receiving member 5, a folded portion 11 of the armature 4 described later is supported by welding.

The upper frame 2a is formed in a box shape, and a rear frame 22 is supported from the rear surface of the upper frame 2a to the side frames 2b, 2b. On the front side of the rear frame 22, an armature holding plate 23 formed in a U-shaped cross section is supported, and a closed-loop sliding member (made of synthetic resin) 24 surrounded by the armature holding plate 23 is interposed. The vertical portions 10, 10 of the armature 4, which will be described later, are held. Since the sliding member 24 is made of a synthetic resin, the armature holding plate 2 made of an iron plate means through the sliding member 24.
The reason is that the iron plate 3 does not directly contact the iron-made vertical portions 10 and 10.

The armature 4 includes hollow vertical portions 10 and 10 which are arranged side by side as viewed from the front and a folded portion 11 formed at the lower end of the vertical portions 10 and 10.
Is formed in a substantially U-shape. The folded portion 11
Has a flat plate shape, as shown in FIG.

The vertical portion 10 is provided on the upper frame 2a of the seat back frame 2 with upper and lower UP, DW
And is rotatably supported by the armature holding plate 23 via the sliding member 24 so as to be rotatable back and forth.

The vertical portion 10 of the armature 4
At the upper end of 10, holders 25, 25 made of synthetic resin are supported. The holder 25 has a stay 1 built in the headrest 3 and having an end hanging down.
4 is supported so as to be movable up and down and locked at an appropriate position.

The vertical portion 10 and the folded portion 11 of the armature 4 are formed separately from each other. That is, both upper end portions 11a, 11a of the folded portion 11 formed in a U-shape in a front view are inserted into the lower end portions of the vertical portions 10, 10 and supported so as not to be separated from each other. May be formed. In the case of being integrated, the armature 4 is formed by folding the pipe member into a U-shape and crushing the folded portion 11 by a press or the like.

Reference numeral 7 in FIG. 2 denotes a pad made of polyurethane foam or the like which is arranged slightly apart from the front side of the pressure receiving member 5 or the like.

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

The armature 4 has, on the pressure receiving member 5, vertical portions 10 and 10 which are arranged side by side in a right and left direction when viewed from the front. In other words, the pressure receiving member 5 is fixed to the folded portion 11 at the lower end of the armature 4.

In this state, when the own vehicle is collided and the seated occupant (not shown) is pushed by the rear side RR due to the secondary collision and the pad 7 moves to the rear side RR, the pad 7 is moved by the back of the occupant. , The pressure receiving member 5 is pushed to the rear side RR. However, as shown in FIG. 3 (the direction of the push is indicated by an arrow), the pad 7 is
By simply touching the upper surface 10, the user moves only upward by sliding on the surface of the vertical portions 10, 10 without moving into the upward direction. For this reason, the rise accompanying rotation of the armature 4 is not hindered, and the operation amount of the headrest 3 can be sufficiently secured.

An operating link 6 supporting the pressure receiving member 5
Is rotationally urged about the bolt 20 and is moved from the position indicated by the solid line to the position indicated by the two-dot chain line shown in FIG.
Rotated in the R direction.

Therefore, when the operating link 6 is rotated to the upper side UP, the holders 25, 25 together with the vertical portions 10, 10 of the armature 4 move to the upper side UP and the rear side RR. By this movement, the stay 14 of the headrest 3 is also moved upward UP and rearward RR.

Therefore, the vertical portion 10 and the stay 14 are
With the armature holding plate 23 as the center, the position moves from the position indicated by the solid line to the position indicated by the two-dot chain line. The stay 14
As shown in FIG. 2, the headrest 3 supported by
It moves to the front side FR by the dimension and moves to the upper side UP by the dimension B.

In this way, the occupant's upper body moves to the rear side RR, so that the head of the occupant who is left behaving is reliably held by the movement of the headrest 3. At this time, an inclined surface 12 rising to the rear side RR is formed on the upper side of the pressure receiving member 5, and as shown in FIG.
Can move smoothly along. In other words, pad 7
The pressure receiving member 5 is hard to dig into.

When the armature 4 is moved by the pressure receiving member 5, the headrest 3 is movable via holders 25, 25 supported on the upper ends of the hollow vertical portions 10, 10 of the armature 4. . In addition, since the stays 14 of the headrest 3 are supported by the holders 25 and 25 so as to be vertically movable, the headrest 3 can be appropriately adjusted to the head position of the occupant.

Also, a spring 8 is provided between the operating link 6 and the side frame 2b of the seat back frame 2 as a biasing means for biasing the pressure receiving member 5 toward the front side FR. , Rear RR by crew
When no pressing force is applied, the pressure receiving member 5 is at the front side FR by the spring 8. That is, the headrest 3 supported at the upper end of the armature 4 supporting the pressure receiving member 5 at the lower end is accommodated in the rear position by the seesaw principle, so that the occupant's livability is not impaired.

The slope 12 of the pressure receiving member 5 is not limited to the embodiment shown in FIG. 4 but is, for example, a curved slope 26 as shown in FIG. May be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing 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 line SB-SB in FIG. 2;

FIG. 4 is a sectional view showing an operation state of the pad and the pressure receiving member of FIG. 2;

FIG. 5 is a sectional view showing another embodiment of the pressure receiving member.

[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 armature 5 pressure receiving member 6 operating link 6a one end of operating link 6b other end of operating link 7 pad 8 urging means Spring 10 as arm 10 Vertical part of armature 11 Folded part of armature 12, 26 Slope of pressure receiving member FR Front side RR Rear side UP Upper side DW Lower side

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Satoshi Sagara F-term in Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa 3B084 DB01 DB10 DC01 DC02 HA00 3B087 CD05 DB02 DB04 DC06 DC07 DC08 DE01

Claims (4)

[Claims] A seat back frame, an armature pivotally supported on an upper end of the seat back frame so as to be rotatable back and forth, a headrest supported on an upper end of the armature, and a lower end of the armature. A pressure receiving member that is supported by the section and that can receive the pressure of the occupant's back; an operating link rotatably supported by the seat back frame and the pressure receiving member; and a front side of the pressure receiving member. The armature is substantially U-shaped with a vertical portion formed in a left and right juxtaposition in a front view and a folded portion formed at a lower end of the vertical portion. A seat back for a vehicle, wherein the pressure receiving member is fixed to a folded portion of the armature. 2. The vehicle seat back according to claim 1, wherein a slope portion rising rearward is formed on an upper side of the pressure receiving member. 3. The vehicle seat back according to claim 1, wherein the armature is formed in a hollow shape, and a holder is supported at an upper end in a vertical direction portion. A seat back for a vehicle, wherein a stay of a headrest is supported movably up and down. 4. The vehicle seat back according to claim 1, wherein the pressure receiving member is biased forward between the operation link and the seat back frame. A seat back for a vehicle, wherein the urging means is supported.