JP2000201770A - Seat back for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back for automobile which makes the head rest easily movable in the vertical direction keeping the function to securely receive the head part of a driver upon a rear-end collision. SOLUTION: This seat back is constituted of a seat back frame 2, a support means 7 which is equipped rotatable in the longitudinal direction on the upper end part of the seat back frame 2 and supported by movable in the vertical direction, a head rest holder 6 to bridge between the upper end parts 7a of the support means 7, a head rest 3 supported vertically movable by the head rest holder 6, and a support pressure receiving member 15 which becomes movable when the side end parts of the seat back frame 2 received the second collision with the back of a driver generated by the forward shock load by a rear-end collision, etc., and supports the lower end part 7b of the support means 7. A power lifter 18 to make the head rest holder 6 movable up/down is equipped in between the head rest holder 6 and the pressure receiving member 15.

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 supporting means (5) rotatably supported on the upper end of the seat back frame (9) in a forward and backward direction, and a stay (27) on an upper end of the supporting means (5). ) And a headrest (4) supported vertically movably via a headrest holder (not shown) mounted thereon, and a forward impact load such as a rear-end collision supported by the lower end of the support means (5). And at least a pressure receiving member (10) that is movable under the pressure of a secondary collision caused by the back of the occupant.

[0003] Therefore, for example, when the vehicle is collided, an impact load is applied to the seat back (3) toward the front side, and the reaction load of the occupant is applied to the rear side as a reaction to the impact. Act. That is, a so-called secondary collision occurs in which the occupant hits the back element (20) and the pressure receiving member (10) provided between the seat back frames (9), and an impact load is applied. At this time, the pressure receiving member (1
0) is moved to the rear side to support means (5).
The upper end of the upper part (2) of the seat back frame (9)
The headrest (4) supported on the upper end of the support means (5) is moved in a direction approaching the occupant's head by rotating forward with the rotation support point 4).

[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 headrest (4) is moved up and down by holding the headrest (4) by hand or pushing down. By moving the headrest (4) up and down, the operation of adjusting the position of the occupant's head is troublesome, and how the support means (5) responds to the moving load up or down There is no disclosure as to whether such a configuration is employed, and a troublesome operation is required. Therefore, improvement in operability is required.

The present invention has been made by paying attention to such a conventional technique, and makes it easier to vertically move the headrest while maintaining the function of reliably receiving the occupant's head when a rear-end collision occurs. It is intended to provide an automobile seat back which has been manufactured.

[0007]

According to the first aspect of the present invention, there is provided a seat back frame, and a supporting means rotatably movable back and forth and vertically movable at an upper end of the seat back frame; A headrest holder formed by bridging between upper end portions of the support means, and a headrest supported by the headrest holder so as to be vertically movable;
A pressure-receiving member that is movable when receiving the pressure of a secondary collision due to the back of the occupant generated by a forward impact load such as a rear-end collision at the side end of the seat back frame and that supports the lower end of the support means; A power lifter is provided between the headrest holder and the pressure receiving member, the power lifter being capable of vertically moving the headrest holder.

According to a second aspect of the present invention, there is provided the vehicle seat back according to the first aspect, wherein the power lifter includes a motor supported by the pressure receiving member, the motor capable of rotating by the motor, and the headrest. And a rod engaged with the holder.

[0009]

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. 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 pad (not shown) formed of polyurethane foam disposed before and after the seat back frame 2 and a cloth or the like covering the pad. It is formed at least with the skin member 4.

The seat back frame 2 has a pipe-shaped upper frame 2a formed in a substantially horizontal shape, and support members 2aa, 2aa 'suspended from the left and right ends of the upper frame 2a, and upper ends 2ba, 2ba. 'A substantially symmetrical side frame 2b, 2b' on which
Lower ends 2bb, 2b of the side frames 2b, 2b '
An under frame 2c is provided between the b's and is mutually supported by the welding SW.

The support brackets 2aa and 2aa 'of the upper frame 2a of the seat back frame 2 are formed by bridging a holder bracket 5 by welding SW. Further, support portions 5a, 5a projecting toward the front side FR and formed in a U-shape in cross section are disposed at positions separated from the center of the holder bracket 5 to the left and right.

An armature pipe 7 as a "support means" is rotatably provided in the support portions 5a, 5a via a sliding member made of a synthetic resin (not shown) as a "support means" in the front FR and the rear RR. It is movably supported by the lower LWR.

The upper end 7 of the armature pipes 7, 7
The headrest holder 6 is bridged between a and 7a. The headrest holder 6 has a plate-shaped holder plate 8 formed by bridging by welding SW between upper end portions 7a, 7a of the armature pipes 7, 7, and a welding SW at positions separated from the holder plate 8 from side to side. It is composed of vertically supported pipe-shaped support portions 9, 9, which are supported, and synthetic resin holder portions 10, 10 fitted in the holder portions 9, 9.

The headrest 3 is provided with stays 11, 11 on holder portions 10, 10 of the headrest holder 6.
The stoppers 10a, 10a can be moved up and down by releasing the stoppers 10a, 10a.
The positions of the stays 11, 11 are fixed by firmly holding a, 10a.

Reference numerals 12 and 12 ′ denote side frames 2 b and 2, which are “side ends” of the seat back frame 2.
The brackets 13 and 13 'supported by welding to b'
One end portions 12a and 12a 'are connected to the front FR by the first pin 14.
And an operation link rotatably supported by the rear side RR. The operating link 12 'and the bracket 13' arranged on the left side of FIG. 2 are not shown because they are both hidden by the side frame 2b '.

Reference numeral 15 denotes a position which receives a pressure of a secondary collision by the back 30a of the occupant 30 generated by an impact load directed to the front side FR such as a rear-end collision, and bolts the lower end portions 7b, 7b of the armature pipes 7, 7 to bolts. The pressure receiving member 15 is formed by a rigid body such as an iron plate and formed in a rectangular shape extending left and right. Both ends 15a, 15a 'and the actuation links 12, 1
The other end portions 12b and 12b 'of the 2' are rotatably supported by the second pin 17 on the front side FR and the rear side RR.

A power lifter 18 is provided between the headrest holder 6 and the pressure receiving member 15 so as to move the headrest holder 6 up and down.

The power lifter 18 includes a motor 20 supported by a bolt and nut 19 in a recessed portion 15b formed on the pressure receiving member 15 and a headrest 3 of the headrest holder 6 rotatable by the motor 20. Lower ends 11a, 1 of stays 11, 11
It comprises a rod 23 engaged with a nut 22 fixed to a bracket 21 bridged to 1a.

The spring hooks 24, 24 'of the side frames 2b, 2b' and the operating links 12, 12 '
Coiled springs 25, 25 'as urging means are disposed between the operating links 1 and 2.
The other end portions 12b and 12b 'of the second 2 are constantly biased toward the front side FR. Spring hook 2 arranged on the left side of FIG.
4 ', the other end 12b' of the operating link 12 ', and the spring 25' are not shown because they are both hidden by the side frame 2b '.

The armature pipes 7, 7 are arranged side by side in a right and left direction when viewed from the front, and form a vertical shape.
In front view, at least AF05% tile mannequin (SA
It is arranged on the center side from the shoulder point of E).
AF05% tile mannequin (SAE) is located on the center side of the shoulder point, which means that the armature pipes 7, 7 are located inside the shoulder point 31 of most occupants 30 of adult physique. Therefore, even if the occupant 30 receives a load from the front FR of the seat back frame 2 due to the collision of the vehicle, the shoulder point 31 of the occupant 30 does not interfere.

The reference numeral 26 in FIG.
S-shaped springs supported by b and 2b 'are disposed below the pressure receiving member 15 and hold the occupant 30. 2 is the armature pipe 7,
A rubber-like stopper supported by the upper frame 2a at the position of the rear side RR of the armature 7 so as to prevent the upper end portions 7a, 7a of the armature pipes 7, 7 from turning to the rear side RR beyond this position. It is.

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

As shown in FIG. 1, the occupant 30
Seat cushion 29, and the seat back 1
In a normal state in which the back 30a is leaned on the back, a slight gap 3 exists between the head 30b of the occupant 30 and the headrest 3.
There is also a slight gap 33 between the back 30a of the occupant 30 and the pressure receiving member 15. The crew 3
The pad and the skin member 4 are interposed between the back 30a and the pressure receiving member 15, but the load from the occupant 30 is not applied to the pressure receiving member 15.

In this state, if a motor (not shown) is turned on and the motor 20 is operated, the nut 23 moves up and down via the rod 23, and the bracket 23 is moved together with the nut 23.
1 moves up and down, the headrest 3 stay 1
1, 1 and 11 are moved up and down, and the operation of matching the position of the head 30b of the occupant 30 can be easily performed.

The occupant 3 is placed on the headrest 3 whose position has been adjusted.
0, the head 30b leans back, and when the own vehicle collides, the seated occupant 30 is caused to fall into the rear side R by a secondary collision.
As shown by the white arrow in FIG. The pressure receiving member 15 is pressed to the rear side RR via a pad or the like by the pressing force of the back 30a of the occupant 30.
The shoulder point 31 of the occupant 30 is at least AF
Since the shoulder point is formed by the 05% tile mannequin, the pad or the like does not bite into the armature pipe 7, and the rise due to the rotation of the armature pipe 7 is not prevented. That is, the operation amount of the headrest 3 can be sufficiently secured.

Further, since the pressure receiving member 15 is formed of a rigid body such as an iron plate, a load in the rear RR direction by the occupant 30 is transmitted to the armature pipe 7 reliably. That is, the headrest 3 moves immediately when a load is applied to the pressure receiving member 15, so that there is no timing loss. In addition, the amount of movement of the pressure receiving member 15 increases.

One end 12a of the operating link 12 supporting the pressure receiving member 15 is urged to rotate about the first pin 14, and the other end 12b of the operating link 12 is moved from the position shown in FIG. 3, the other end 12 b of the operation link 12 is moved to the upper side U around the first pin 14.
It is rotated in the P and rear RR directions.

Thus, the other end 12b of the operation link 12
Is rotated to the upper side UP and the rear side RR, the lower end portion 7b of the armature pipe 7, that is, the pressure receiving member 15
And it moves to back side RR. With this movement, the upper end portion 7a of the armature pipe 7, that is, the headrest holders 6, 6 rise toward the upper side UP and the front side FR. Due to the upward movement, the stay 11 of the headrest 3 is also moved to the upper side UP and the front side FR.

Accordingly, as described above, since the armature pipes 7, 7 and the stays 11, 11 move together about the holder bracket 5, the headrest 3 supported by the stays 11, 11 is moved to the position shown in FIG. As shown in FIG. 5, the head 30b of the occupant 30 comes into contact. In FIG. 3, the headrest 3 is illustrated as biting into the head 30 b of the occupant 30, but the headrest 3 is depressed in the left and right center, and the head 30 b of the occupant 30 is also 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.

Since the headrest 3 is supported by the power lifter 18 so that it can easily move up and down, the headrest 3 can be appropriately adjusted to the position of the head 30b of the occupant 30 having a different size.

Further, a spring 25 for urging the pressure receiving member 15 toward the front side FR is supported between the operating link 12 and the side frames 2b, 2b 'of the seat back frame 2, so that the occupant is supported. 30's back 30a
In the state where the pushing force to the rear side RR by the is not applied,
Due to the spring 25, the pressure receiving member 15 is on the front side FR. That is, the headrest 3 supported at the upper end of the armature pipe 7 supporting the pressure receiving member 15 at the lower end is accommodated in the rear RR position according to the seesaw principle, so that the occupant 30's livability is not impaired.

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 support means is supported on the upper end of the seat back frame so as to be rotatable in the front-rear direction and freely movable up and down, and the headrest is vertically moved between the upper ends of the support means. A headrest holder movably supported is bridged, and a pressure receiving member is provided at a side end of the seat back frame for receiving a pressure of a secondary collision due to a back of an occupant generated by a forward impact load such as a rear-end collision. And a power lifter which supports the lower end of the support means on the pressure receiving member, and which can move the headrest holder up and down between the headrest holder and the pressure receiving member. Therefore, when the pressure receiving member is pushed rearward by the back of the occupant in a rear-end collision or the like, the headrest moves forward and upward to hold the occupant's head, and The time of sitting is vertically movable headrest to an appropriate position by the power lifter.

According to the second aspect of the present invention, the power lifter includes a motor supported by the pressure receiving member, and a rod rotatable by the motor and engaged with the headrest holder. Therefore, when the motor is operated, the headrest holder can be moved up and down with respect to the pressure receiving member, and the headrest can be moved up and down to an appropriate position.

[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 the seat back frame excluding the occupant in FIG. 1;

FIG. 3 is a sectional view showing an operation embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat back 2 Seat back frame 2a Upper frame of seat back frame 2b, 2b 'Side frame of seat back frame 3 Headrest 4 Skin member 5 Holder bracket 5a Supporting part 6 Headrest holder 7 Armature pipe as supporting means 7a Upper end of armature pipe Part 7b Lower end of armature pipe 8 Holder plate 9 Holder part 10 Holding part 11 Stay 12, 12 'Working link 12a, 12a' One end of working link 12b, 12b 'The other end of working link 14 First pin 15 Pressure receiving member 17 2nd pin 18 power lifter 20 motor 23 rod 25 coiled spring 30 occupant 30a occupant's back 30b occupant's head FR front side RR rear side UP upper side LWR lower side

Claims (2)

[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 formed by bridging between the upper ends of the supporting means. A holder, a headrest movably supported up and down by the headrest holder, and a secondary collision pressure caused by a back of an occupant generated by a forward impact load such as a rear-end collision at a side end of the seat back frame. A power receiving member which is movable and supports a lower end portion of the support means, and a power lifter capable of vertically moving the headrest holder is provided between the headrest holder and the pressure receiving member. An automobile seat back characterized by the above-mentioned. 2. The vehicle seat back according to claim 1, wherein the power lifter is a motor supported by the pressure receiving member, and is rotatable by the motor and engaged with the headrest holder. An automobile seat back comprising a rod.