JP2000211410A - Automotive sheet - Google Patents

Abstract

(57) [Summary] [Problem] To effectively prevent a occupant from whiplashing by moving a headrest further forward with the movement of an occupant's upper body during a rear-end collision. SOLUTION: A headrest support frame 7 on which a headrest 4 is mounted is fixed to an upper end portion of a lever / link mechanism 10 mounted on a seat back frame 5, and the lever / link mechanism 10 receives a load applied from the front of the seat back. A lever 18 that swings up and down around the horizontal axis in conjunction with the moving pressure receiving portion 22, a first link 11 having a lower end pivotally supported by the lever 18 and an upper end to which the headrest support frame 7 is fixed, and both ends at a first end The intermediate portion of the link 11 and the second link 12 pivotally supported by the seat back frame 5 increase the amount of movement of the pressure receiving portion 22 to move the headrest 4 diagonally forward and upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat provided with a headrest, and more particularly to a vehicle seat provided with a mechanism for moving the headrest to a position near the head of the occupant in order to reduce the whip obstacle of the occupant in a collision. It is about.

[0002]

2. Description of the Related Art Conventionally, a headrest for receiving the occupant's head from behind is disposed above a seat back of an automobile seat in order to prevent an occupant from whiplashing when the automobile is collided. However, when the headrest is fixed, the seat back inclines backward and the occupant's body rises obliquely rearward due to the acceleration of the entire seat due to the impact at the time of a rear-end collision and the occupant's inertia. However, a large load acts on the neck due to the displacement above the headrest, and it was difficult to reliably prevent the occupant from whiplashing.

In order to cope with such a problem, the present applicant has previously proposed a structure shown in FIG. 7 in Japanese Utility Model Laid-Open Publication No. Hei 7-1842.

In FIG. 7, when an impact is applied from the rear as shown by a white arrow due to a rear-end collision as shown in FIG. 7B from the normal state as shown in FIG. The impact pressure receiving frame 32 disposed in front of the seat back frame 31 is bent by the lower rigidity portion 33 by the moving motion and moved backward, and the headrest support connected to the impact pressure receiving frame 32 with the backward movement. The arm 34 is rotated around the upper side of the seat back frame 31 via the rotation support portion 35, and the headrest 36 provided at the upper end of the headrest support arm 34 is moved forward. As described above, the headrest 36 is moved forward by the rearward movement of the occupant's upper body at the time of the rear-end collision, and the whip-hitting obstacle is prevented by approaching the occupant's head.

As shown in FIG. 8, an upper portion of a headrest support frame 43 is supported by a bearing portion 42 provided at an upper end portion of a seatback frame 41 so as to be able to rotate back and forth and slide up and down. A headrest 44 is provided at an upper end of the headrest support frame 43, an impact pressure receiving part 45 is provided at a lower end of the headrest support frame 43, and the other end of a vertical swing lever 46 pivotally supported at one end to the seat back frame 41 is connected to a lower end of the headrest support frame 43. Later, there has been proposed a device provided with an urging means 47 for pivotally supporting the portion and for urging the intermediate portion of the up-and-down swing lever 46 to swing downward.

In this configuration, when the impact pressure receiving portion 45 is pressed rearward by the rearward movement of the occupant's upper body during a rear-end collision, the lower end of the headrest support frame 43 is connected to the vertical swing lever 46. As a result, the lower end of the headrest support frame 43 is pushed upward along with the rearward movement, and the headrest 44 moves diagonally forward and upward to approach the occupant's head, thereby preventing a whiplash obstacle.

Japanese Patent Application Laid-Open No. Hei 10-138811 discloses that a headrest is obliquely moved along a circular locus around a fixed axis while a posture of a headrest is maintained by movement of a pressure receiving portion by a lever link mechanism having a parallel link mechanism. There is disclosed one that is turned upward and forward.

[0008]

However, in the configuration as shown in FIG. 7, the amount of rearward movement of the impact pressure receiving frame 32 and the amount of forward movement of the headrest 36 are limited by the rotation support portion at the upper end of the seat back frame 31. Since the distance between the upper end of the headrest support arm 34 and the headrest 36 is not long, the distance between the upper end of the headrest support arm 34 and the headrest 36 is usually not long.
6 is not so large, and the trajectory of the headrest moves forward or diagonally forward and downward, while the body of the occupant rises obliquely upward and rearward during a rear-end collision, so that the head may be located above the headrest 36. Therefore, there is a problem that the effect of preventing whiplash is limited.

[0009] In the configuration shown in FIG.
Although the headrest 44 moves diagonally upward and forward, since the bearing 42 is provided at the upper end of the seat back frame 41, the amount of movement of the headrest is small, causing the same problem.

Also, in the device disclosed in Japanese Patent Application Laid-Open No. H10-138811, the headrest moves diagonally upward and forward while maintaining its posture by the parallel link mechanism. In practice, it is impossible to increase the amount of movement of the headrest relative to the amount of movement of the headrest, and there is a similar problem.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional problems, and has as its object to provide an automobile seat having a high whiplash-preventing effect. An object of the present invention is to provide an automobile seat that can be moved and can surely prevent a whiplash injury.

[0012]

According to a first aspect of the present invention, there is provided a vehicle seat having a headrest supporting frame having a headrest mounted thereon is fixed to an upper end portion of a lever link mechanism mounted on a seatback frame. A pressure receiving part that moves under the load applied from the front
The lever / link mechanism is connected to the link mechanism, and the lever / link mechanism is configured to increase the amount of movement by the above-described movement of the pressure receiving portion to move the headrest obliquely forward and upward. , The forward movement amount of the headrest can be increased by the lever / link mechanism with respect to the movement amount of the pressure receiving portion, and the whiplash preventing effect can be reliably obtained.

According to a second aspect of the present invention, in the vehicle seat, the lever-link mechanism is rotated obliquely forward and upward along an arc-shaped trajectory while rotating the pressure-receiving portion so as to tilt the headrest support frame forward. The headrest is moved diagonally forward and upward by a combination of the diagonally forward and upward movement along the arc-shaped trajectory of the headrest support frame and the rotation of the headrest support frame to be tilted forward. The amount is increased, and the above-described effect is obtained.

According to a third aspect of the present invention, there is provided a vehicle seat according to the first or second aspect, wherein the lever and link mechanism are provided with a lever which swings up and down around a horizontal axis in conjunction with movement of the pressure receiving portion, and a lower end thereof. A first link pivotally supported by a lever and having a headrest support frame fixed to an upper end thereof; and a second link pivotally supported at both ends by an intermediate portion of the first link and a seat back frame. The above effects can be obtained at a low cost with a simple configuration including the first and second links.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle seat according to an embodiment of the present invention; FIG.

1 and 2, reference numeral 1 denotes a seat cushion of a vehicle seat, 2 denotes a seat back which is mounted on the seat cushion 1 so as to be reclineable via an adjustment mechanism 3, and 4 denotes an upper portion of the seat back 2. It is the headrest that was done.

Reference numeral 5 denotes a seat back frame constituting a frame structure of the seat back 2, which is formed by connecting upper and lower portions of left and right press-formed side frames 5a with a connecting pipe member 5b. A pair of brackets 6 that protrude upward are attached to both sides of the upper connecting pipe member 5b.

A headrest support frame 7 for supporting the headrest 4 is constituted by fixing a pair of support posts 7b to a horizontal formed pipe 7a, and is suspended from the headrest 4 by an adjusting member 8 mounted on the support post 7b. The headrest 4 is attached so that the height can be adjusted by inserting a pair of stays 4a.

Side frame 5 of seat back frame 5
As shown in detail in FIG. 3, a lever / link mechanism 10 is disposed inside the a. The both ends of the molded pipe 7a of the headrest support frame 7 are integrated with the upper end of the first link 11 by welding. It is fixed. This first link 11
Is press-formed in a gentle S-shape to avoid interference with the upper connecting pipe member 5b, and has a gentle circular arc shape in the middle thereof to avoid interference with the upper connecting pipe member 5b. Second link 1 press-formed
Two ends are connected by a pivot pin 13. The other end of the second link 12 is connected by a pivot pin 14 to a bracket 6 attached to the upper connecting pipe member 5b.

Side frame 5 of seat back frame 5
A bearing boss 15 having a threaded hole is provided at a front portion located a suitable distance from the upper end of the L-shaped lever 17 by a pivot bolt 16 fastened and fixed to the bearing boss 15. An intermediate bend is pivotally supported. 16a is a shaft hole through which the pivot bolt 16 passes. A horizontal lever 18 extending substantially rearward in the horizontal direction of the L-shaped lever 17 constitutes a lever of the lever link mechanism 10, and the lower end of the first link 11 is connected to the front end (rear end) of the lever link mechanism 19 by a pivot pin 19. ing.
19a is a pin hole formed in the horizontal lever 18.

Further, a band-like cloth 21 is suspended between the vertical levers 20 of the L-shaped levers 17 on both sides which are suspended substantially vertically.
The seat back 2 is formed by the vertical lever 20 and the band-shaped cloth 21.
The pressure receiving portion 22 is configured to move by receiving a load applied from the front surface. In the lower part of the pressure receiving portion 22, an S spring 23 is suspended between the front ends of the side frames 5a on both sides.

A spring hook 24 is provided at an intermediate portion of the horizontal lever 18 which is a lever of the lever / link mechanism 10, and a tension spring 26 which is hooked between a spring hook 25 provided below the side frame 5a. The horizontal lever 18 is urged to swing downward. The horizontal lever 18
The upper and lower swing ranges are restricted by stoppers 27a and 27b protruding from the inner surface of the side frame 5a. Further, as shown in detail in FIG. 4, the horizontal lever 1 is located at an appropriate distance behind the bearing boss 15 on the inner surface of the side frame 5a.
A plunger 28 with a built-in spring is provided for restraining the plunger 8 at the upper and lower swing end positions, and the horizontal lever 18 has a locking hole 2 into which the plunger 28 is fitted and engaged at the swing end position.
9a and 29b are provided.

Thus, when a load equal to or more than a predetermined value is applied to the pressure receiving portion 22, the horizontal lever 18 comes into contact with the stopper 27a, and the urging force of the tension spring 26 is shifted from the position where the plunger 28 is fitted and engaged with the locking hole 29a. , And abuts against the stopper 27b at the upper swing limit, and the plunger 28 is fitted into and engaged with the locking hole 29b and locked at that position.

In the above configuration, in the normal state before the collision, as shown in FIG. 1, the horizontal lever 18 of the L-shaped lever 17 as the lever of the lever / link mechanism 10 is pulled by the tension spring 2.
6 and is engaged with the stopper 27a, and the plunger 28 is engaged and locked in the locking hole 29a. Therefore, the plunger 28 is fixed to the upper end of the first link 11 of the lever link mechanism 10. The headrest 4 supported by the headrest support frame 7 is stationary at a regular position.

Next, when the car is hit, the seat is impacted forward and the upper body of the occupant is moved rearward by the reaction, and a large load acts on the front of the seat back 2 toward the rear. I do. Then, since a load equal to or more than a predetermined value is applied rearward to the pressure receiving portion 22 in the seat back 2, the pressure receiving portion 22 swings rearward, and the horizontal lever 18 of the L-shaped lever 17 is locked with the plunger 28. It is released from the restraint by the engagement of the hole 29 a and swings upward against the urging force of the tension spring 26. When the horizontal lever 18 swings to a position where it comes into contact with the stopper 27b, the plunger 28 is
By fitting into 9b, it is restrained again at that position.

When the horizontal lever 18 rotates as described above,
As shown in FIG. 5, the headrest support frame 7 is pushed up along a circular locus obliquely forward and upward while rotating so that the headrest support frame 7 falls forward through the lever / link mechanism 10 in conjunction with the headrest. Move closer to the part.

The load of the occupant acting rearward due to the reaction of the impact at the time of the rear-end collision is changed into a forward load by the reaction, and the occupant's body is moved forward while the head is moved forward. The head is shaken backwards greatly, and a shearing force acts on the neck, causing whiplash injury. On the other hand, as shown in FIG. In the case of, since the distance between the headrest 4 and the head is large, the head is largely swung backward as shown by the solid line. However, in the present embodiment, as shown in FIG. Because of the approach, the rearward movement of the head can be reliably received and the occupant's neck can be protected.

The load applied by the reaction due to the impact at the time of the rear-end collision applies a load equal to or more than a predetermined value to the band-like cloth 21 and the S-spring 23.
The impact energy is absorbed by the spring 23 extending backward by the spring action, and the impact force on the occupant is reduced.

When the occupant restarts operation after a collision, a load of a predetermined value or more is applied to the headrest 4 from above to below, so that the engagement between the plunger 28 and the locking hole 29b is released, and The lever 18 swings downward, the horizontal lever 18 comes into contact with the stopper 27a, and the plunger 28 can be restored to the rest position in which the plunger 28 is fitted and engaged with the locking hole 29a.

[0030]

According to the vehicle seat of the present invention, the headrest support frame having the headrest mounted thereon is fixed to the upper end of the lever / link mechanism mounted on the seatback frame as described above. A pressure receiving portion that moves under the applied load is provided and connected to a lever link mechanism. The lever link mechanism increases the amount of movement by the above-described movement of the pressure receiving portion and moves the headrest diagonally forward and upward. With this configuration, the forward movement amount of the headrest can be increased by the lever link mechanism with respect to the movement amount of the pressure receiving portion due to the rearward movement of the occupant's upper body at the time of a rear-end collision, and the whiplash preventing effect can be reliably obtained.

Further, the lever / link mechanism may be configured to move obliquely forward and upward along an arc-shaped trajectory while rotating so that the headrest support frame is tilted forward by the movement of the pressure receiving portion. Since the headrest moves diagonally forward and upward along a diagonally forward and upward movement along the arc-shaped locus of the headrest support frame, the headrest moves upward diagonally, so that the above-described effect is achieved.

The lever / link mechanism may include a lever that swings up and down around a horizontal axis in conjunction with movement of the pressure receiving portion.
When a lower end is constituted by a first link pivotally supported by a lever and an upper end to which a headrest support frame is fixed, and both ends are constituted by an intermediate portion of the first link and a second link pivotally supported by a seat back frame, the lever and the first The above effect can be obtained at a low cost with a simple configuration including the and the second link.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional side view of an embodiment of an automobile seat of the present invention.

FIG. 2 is a partial vertical sectional front view of the embodiment.

FIG. 3 is a detailed perspective view of the lever and link mechanism of the embodiment.

FIG. 4 is a perspective view of a lever locking means of the embodiment.

FIG. 5 is a partial vertical sectional side view showing an operation state of the embodiment.

FIG. 6 is an explanatory diagram comparing operation states of the headrest of the embodiment and a conventional example.

FIG. 7 is a side view showing an operation state of a conventional automobile seat.

FIG. 8 is a perspective view showing a schematic configuration of another conventional automobile seat.

[Description of Signs] 2 Seat back 4 Headrest 5 Seatback frame 7 Headrest support frame 10 Lever link mechanism 11 First link 12 Second link 18 Horizontal lever (lever) 22 Pressure receiving part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Chimura 2-1-1 Taoyuan, Ikeda-shi, Osaka Daihatsu Industry Co., Ltd. (72) Masatoshi Tanaka 2-1-1 Taoyuan, Ikeda-shi, Osaka Daiha Inside Tsutsu Kogyo Co., Ltd. (72) Noboru Shimamoto 2-1-1, Taoyuan, Ikeda-shi, Osaka Daihatsu Kogyo Co., Ltd. F term in the company (reference) 3B087 BD03 BD04 CD04 DC06 DC08

Claims (3)

[Claims] 1. A headrest supporting frame having a headrest mounted thereon is fixed to an upper end portion of a lever link mechanism mounted on a seatback frame, and a pressure receiving portion is provided which moves by receiving a load applied from the front surface of the seatback.
An automobile seat connected to a link mechanism, wherein the lever-link mechanism is configured to increase the amount of movement by the above-described movement of the pressure receiving portion to move the headrest diagonally forward and upward. 2. A headrest supporting frame having a headrest mounted thereon is fixed to an upper end portion of a lever link mechanism mounted on a seatback frame, and a pressure receiving portion which is moved by receiving a load applied from the front surface of the seatback is provided.
Linked to a link mechanism, wherein the lever link mechanism is configured to move along the arc-shaped locus diagonally forward and upward while rotating the headrest support frame to fall forward by the above-described movement of the pressure receiving portion. Features automotive seats. 3. A lever link mechanism comprising: a lever swinging up and down around a horizontal axis in conjunction with movement of a pressure receiving portion; and a first link having a lower end pivotally supported by the lever and a headrest support frame fixed to an upper end. The vehicle seat according to claim 1, further comprising a middle portion of the first link and a second link pivotally supported by the seat back frame at both ends.