JPH10262776A - Automobile seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automobile seat in which a headrest is automatically moved to a position close to the head to exhibit an effect on prevention of whiplash when a rear-end collision is received. SOLUTION: In an automobile seat having a seat back 3 having a seat back frame 5 as core material and a headrest 4 mounted on the upper part of the seat back 3, an impact pressure receiving member 6 for receiving the backward movement of the upper half body of an occupant is arranged, so that the impact pressure receiving member 6 is moved according to the backward movement of the upper half body of the occupant when a strong impact is received in a rear-end collision, and the headrest 4 linked to the impact pressure receiving member 6 is moved according to the movement of the impact pressure receiving member 6 so as to approach the head of the occupant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat and, more particularly, to a headrest that is automatically moved to a position close to the head of an occupant in a rear-end collision to prevent an occupant from whipping when the rear-end collision occurs. The present invention relates to a vehicle seat provided with a headrest moving mechanism for moving a vehicle.

[0002]

2. Description of the Related Art A headrest provided on an automobile seat is mounted on an upper portion of a seatback in order to prevent an occupant from whipping due to a rear-end collision. In order to achieve the purpose of preventing the whipping trouble by the headrest, it is necessary that the headrest is mounted at an appropriate position. Therefore, various automobile seats have been proposed in which the front and rear positions of the headrest can be adjusted.

[0003] For example, in the retractable headrest disclosed in Japanese Utility Model Laid-Open No. 60-112595, the headrest 23 is configured to be movable in the front-rear direction as shown in FIG. As shown in the drawing, a column 24 supporting the headrest 23 is rotatably mounted on the seat back 22, and a guide pin 28 provided on the column 24 and a guide plate 27 provided on the seat back 22 are fitted. By
The position of the headrest 23 can be locked, and the front / rear position of the headrest 23 can be adjusted stepwise.

Japanese Patent Laid-Open Publication No. Hei 4-197840 discloses that a headrest can be driven to move forward, a shock at the time of a rear-end collision is detected by a collision detecting means, and the headrest is moved based on the detection signal. There is disclosed one that is moved forward to receive a head.

[0005]

In order to prevent whipping, the smaller the distance between the head and the headrest, the less the head is swung rearward in the event of a collision, thereby reducing whipping movement. it can. Therefore, it is desirable to adjust the front and rear positions of the headrest so that the headrest is at a position closest to the head.

[0006] However, the fact that the headrest is always located at a position close to the head gives an uncomfortable feeling to the occupant's driving posture.
In addition, it hinders the free movement of the head at the time of back or side confirmation. Therefore, even in the case where the front-rear position adjustment function is provided as in the above-described conventional configuration, the head is rarely adjusted to a position closest to the head, and as a result of being adjusted to a position away from the head, the effect of preventing whiplash is achieved. There was a problem that was not fully exhibited.

Further, when the headrest is moved forward by detecting the collision with the collision detecting means at the time of a collision, the structure becomes complicated and the cost increases, and depending on the detection sensitivity, it does not operate at the time of a collision, or conversely, unexpectedly. There is a problem that it may operate to cause inconvenience.

The present invention has been made in view of the above-mentioned problems, and the headrest is located at a position excessively distant from the head in a normal state, and the headrest automatically comes close to the head when a rear-end collision occurs. It is an object of the present invention to provide an automobile seat that moves to a position and exhibits an effect of preventing whipping.

[0009]

SUMMARY OF THE INVENTION An automobile seat according to the present invention is an automobile seat including a seat back having a seat back frame as a core material and a headrest mounted on an upper portion of the seat back. An impact pressure receiving member for receiving the rearward movement of the occupant's upper body is provided, and when receiving a strong impact at the time of a rear-end collision, the impact pressure receiving member moves with the rearward movement of the occupant's upper body, and accompanying the movement of the impact pressure receiving member, Thus, the headrest connected to the impact pressure receiving member moves so as to approach the head of the occupant.

Therefore, at the time of a rear-end collision, the impact pressure receiving member moves as the upper body of the occupant moves rearward due to the impact, and the headrest moves along with the impact to move closer to the occupant's head. The headrest reliably operates in conjunction with the movement of the occupant's upper body, and there is no danger of accidental operation.

A headrest support frame having a headrest attached to an upper end portion is provided, an intermediate portion of the headrest support frame is movably supported by a seat back frame, and an impact pressure receiving member is disposed below the support portion. When the impact pressure receiving member is connected to the lower end portion of the frame, the rearward movement of the impact pressure receiving member is transmitted to a portion below the support portion of the headrest support frame, so that the headrest can be moved as described above with a simple configuration.

A movement restricting portion is provided between the impact pressure receiving member and the seat back frame, and when the rearward load applied to the impact pressure receiving member is equal to or less than a predetermined value, the movement restricting portion moves the impact pressure receiving member to a predetermined position. In such a case, the impact pressure receiving member and the headrest do not unexpectedly move during normal times, and do not hinder free movement of the head. If the movement restricting portion is constituted by a low rigidity portion that is deformed when receiving a strong impact, the impact at the time of a rear-end collision can be absorbed by the deformation energy of the low rigidity portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an automobile seat according to the present invention will be described below with reference to FIGS.

In FIG. 1A, an automobile seat 1 is shown.
The seat back 3 is attached to the back of the seat cushion 2 so that a backrest angle can be adjusted, and a headrest 4 is attached to an upper portion of the seat back 3.

As shown in FIG. 1, the interior of the seat back 3 is provided with an impact pressure receiving frame (impact pressure receiving member) 6 in front of a seat back frame 5 forming a core of the seat back 3. The lower end of the frame 6 is fixed to the lower end of the seat back frame 5. The seat back frame 5 is viewed from the front (see FIG. 1B).
A rotating member 9 fixed to the headrest support frame 7 is rotatably fitted to an upper side of the inverted U-shape.

The headrest support frame 7 is shown in FIG.
As shown in (b), it is constituted by two support frames 7a and 7b, the headrest 4 is supported by each upper end, and the rotating members 9a and 9b are fixed to each intermediate part, and the lower part is L-shaped. Each end is joined to the upper end of the impact pressure receiving frame 6.

Since the rotating members 9a and 9b are rotatably fitted to the seat back frame 5 formed of a circular pipe as described above, the headrest supporting frame 7 rotates in the front-rear direction with the intermediate portion as a fulcrum. Can move.
However, since the end portion is joined to the upper end portion of the impact pressure receiving frame 6 as described above, the headrest support frame 7 cannot rotate at all times. The rotation relates to the operation of the impact pressure receiving frame 6.

The operation of the impact pressure receiving frame 6 is a change in the upper position of the impact pressure receiving frame 6 to which the headrest support frame 7 is joined, and the structure for causing the position variation is as shown in FIG. It is a low-rigidity portion (movement restricting portion) 8 formed below the pressure receiving frame 6. When viewed from the front (see FIG. 1 (b)), the low-rigidity portion 8 is formed by drilling or cutting a required number of holes at the lower part on both sides of an impact pressure receiving frame 6 formed by bending a circular pipe into an inverted U-shape. It is formed by performing a chipping process. Since the rigidity of the pipe in this portion is reduced by such partial drilling or notching, the low-rigidity portion 8 is deformed when the impact receiving frame 6 is subjected to a strong impact exceeding a predetermined level. The pressure receiving frame 6 is bent from the low rigidity portion 8.

Next, the operation at the time of a rear-end collision in the vehicle seat having the above configuration will be described with reference to FIG.

FIG. 2A shows a state where the head of the occupant 12 seated on the seat and the headrest 4 are maintained at an appropriate distance so as not to hinder the free movement of the head. When a means for adjusting the front / rear position of the headrest 4 is provided, an adjustment mechanism can be provided in the headrest 4.

When a rear collision occurs, the occupant 12 receives an impact whose upper body is swung rearward, so that a strong impact load is applied from the front of the seat back 2 to the rear by the back of the occupant 12. As a result, as shown in FIG. 2B, the impact pressure receiving frame 6 is bent from the low rigidity portion 8, and the upper end moves rearward. By the movement of the impact pressure receiving frame 6, the headrest supporting frame 7 joined to the upper end portion is formed.
Of the headrest support frame 7
Rotates about the intermediate portion, which is pivotally supported by the seat back frame 5 by the pivoting member 9, and moves the headrest 4 forward.

As described above, when a rear-end collision occurs, the impact pressure receiving frame 6 moves rearward to absorb the load caused by the impact of the occupant 12, and the headrest supporting frame 6 is attached to the impact pressure receiving frame 6 by the action of absorbing the load. The headrest 4 linked via the switch 7 is moved forward. As a result, as shown in FIG. 2B, the distance between the headrest 4 and the head of the occupant 12 becomes close to each other in combination with the backward movement of the upper body, and suppresses the whipping movement of the head. As described above, in the movement of the headrest 4 according to the present embodiment, the headrest 4 moves rapidly and largely as the impact of the rear-end collision increases, and the rearward movement of the head can be supported at a close distance, and the whiplash failure can be effectively prevented.

[0023]

According to the present invention, as described above, the impact pressure receiving member for receiving the rearward movement of the occupant's upper body is disposed in the seat back, and the occupant's upper body is moved rearward when a strong impact is generated during a rear-end collision. The impact pressure receiving member moves along with the impact pressure receiving member, and the headrest connected to the impact pressure receiving member moves so as to approach the occupant's head with the movement of the impact pressure receiving member. In conjunction with the movement of the upper body, the headrest operates reliably so as to approach the occupant's head, and the stronger the impact of the rear-end collision, the faster and larger the headrest moves, and there is no risk of unexpected movement, preventing whipping by the headrest The effect can be obtained reliably.

[Brief description of the drawings]

FIG. 1 shows an embodiment of an automobile seat of the present invention,
(A) is a side view, (b) is a rear view.

FIGS. 2A and 2B show an operation state of the vehicle seat according to the embodiment, wherein FIG. 2A is a side view of a normal state, and FIG.

FIG. 3 is a longitudinal sectional side view showing a front / rear position adjustment structure of a headrest in a conventional automobile seat.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile seat 3 Seat back 4 Headrest 5 Seat back frame 6 Impact pressure receiving frame (impact pressure receiving member) 7 Headrest support frame 8 Low rigidity part (movement restriction part) 12 Passenger

Continued on the front page (72) Inventor Masatoshi Tanaka 3000, Yamanoue, Ryuo-cho, Gamo-gun, Shiga Prefecture Inside the Shiga Technical Center of Daihatsu Kogyo Co., Ltd. Company Shiga Technical Center

Claims (5)

[Claims] 1. An automobile seat including a seat back having a seat back frame as a core material and a headrest mounted on an upper portion of the seat back, wherein the seat back includes an impact pressure receiving member for receiving rearward movement of an occupant's upper body. The impact pressure receiving member moves in accordance with the rearward movement of the occupant's upper body when receiving a strong impact at the time of a rear-end collision, and the headrest connected to the impact pressure receiving member moves along with the movement of the impact pressure receiving member. An automobile seat configured to move so as to approach a head of the vehicle. 2. A headrest having a headrest support frame attached to an upper end thereof, wherein the headrest support frame is movably supported at an intermediate portion thereof by a seatback frame, and an impact pressure receiving member is provided below the support portion. The vehicle seat according to claim 1. 3. A headrest support frame having an upper end mounted on a headrest support frame, wherein the headrest support frame is movably supported at an intermediate portion by a seatback frame, and the headrest support frame is connected to an impact receiving member at a lower end thereof. The automotive seat according to claim 1 or 2, wherein 4. A movement restricting portion is provided between the impact pressure receiving member and the seat back frame, and when the rearward load applied to the impact pressure receiving member is equal to or less than a predetermined value, the movement restricting portion controls the impact receiving pressure. 4. The vehicle seat according to claim 1, wherein the member is configured to be held at a predetermined position. 5. The vehicle seat according to claim 4, wherein the movement restricting portion comprises a low rigidity portion that is deformed when receiving a strong impact.