JPH10309967A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely push up the front end part of a seat cushion in a collision by providing cam members on both ends of a horizontally long rotating shaft rotated through a wire by the operation of an actuator, and pushing up the front end part of the seat cushion by the rotation of the cam members. SOLUTION: A horizontally long rotating shaft 6 having cam members 5, 5 on both ends is arranged on a flange 4b. A cylinder type actuator 7 containing an explosive fired in collision is provided on a base plate, and a wire 8 delivered from the actuator 7 is wound on the rotating shaft 6. The actuator 7 pulls the wire 8 by the firing of the built-in explosive in collision. Thus, the rotating shaft 6 is rotated through the wire 8 by the operation of the actuator 7 in collision to rotate the cam members 5 from forward posture to upward posture, cam top parts 5b make contact with the lower surface of a bottom plate 2a to push up a leg support part, and a body part is tilted up forward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat on which an occupant sits.

[0002]

2. Description of the Related Art Conventionally, as a countermeasure against a collision, a vehicle seat provided with an actuator that operates at the time of a collision and pushing up a front end of a seat cushion by the operation of the actuator is disclosed in Japanese Patent Publication No. 51-27052 and Japanese Utility Model Publication No. Sho. 2
It is known from US Pat. Tokiko Sho 51-27
In the vehicle described in Japanese Patent Publication No. 052, the front end of the seat cushion is separated from the seat cushion body, and the front end of the seat cushion is pushed up by a pair of left and right actuators of a cylinder type which extend and operate at the time of collision.

In Japanese Unexamined Utility Model Publication No. 7-27240, a seat cushion is pivotally supported on a base plate of a seat so that the seat cushion can be tilted forward and upward. And a pinion that meshes with both racks is provided at both ends of the rotation shaft, and a seat cushion is provided by rotation of the pinion. Is pushed up to incline the seat cushion upward.

[0004]

SUMMARY OF THE INVENTION The former conventional example is as follows.
Since the front end of the seat cushion is a direct-acting type that is directly pushed up by an actuator, two
There is a problem that the cost increases due to the necessity of two actuators.

On the other hand, in the latter conventional example, only one actuator is sufficient because it is not a direct-acting type. Liable to occur and lack reliability.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a highly reliable and low-cost vehicle seat capable of reliably pushing up the front end of a seat cushion in a collision.

[0007]

Means for Solving the Problems In order to solve the above problems,
The present invention provides an actuator that operates in the event of a collision, and in a vehicle seat in which the front end of the seat cushion is pushed up by the operation of the actuator, the vehicle is provided at both ends of a horizontally long rotating shaft that is rotated via a wire by the operation of the actuator. A cam member is provided, and the front end of the seat cushion is pushed up by rotation of the cam member.

According to the present invention, at the time of collision, the front end of the seat cushion is pushed up via the cam member by the rotation of the rotating shaft by the operation of the actuator. As described above, the present invention is not a direct-acting type, so that only one actuator is required. Furthermore, the structure is simpler than that using the rack and pinion mechanism, and failures such as tooth breakage and tooth skipping are less likely to occur.
Cost can be reduced and reliability can be improved.

[0009]

FIG. 1 shows a seat cushion of a vehicle seat. The seat cushion is divided into four parts: a body part 1, a leg support part 2 at the front end, and left and right side support parts 3 and 3, and these are arranged on a base plate 4 shown in FIG. 2 to constitute a seat cushion. .

The main body 1 includes a pad (not shown) and a bottom frame 1b on which a wire spring 1a for supporting the pad is stretched. And the bottom frame 1b
The rear end of the base plate 4 via the lateral support shaft 1c.
And the main body 1 can be tilted upward.
The left and right side support parts 3, 3 are base plate 4
On the left and right flanges 4a, 4a.

The leg support 2 includes a pad (not shown),
And a bottom plate 2a for supporting the pads. Then, as shown in FIG. 3, a pair of left and right guide sleeves 2b, 2b is vertically provided on the lower surface of the bottom plate 2a.
On the other hand, a stiffener 4c is attached to the lower surface of the flange 4b at the front end of the base plate 4, and a pair of left and right guide pins 4d is implanted in the stiffener 4c.
b is slidably fitted to each guide pin 4d through each through hole 4e formed in the flange 4b, and the leg support portion 2
Is supported so that it can move up and down. In addition, the bottom plate 2a
Is connected to the front end of a wire spring 1a for the main body 1, so that the main body 1 is tilted forward by the upward movement of the leg support 2 via the wire spring 1a.

On the flange 4b at the front end of the base plate 4, a horizontally long rotating shaft 6 provided with cam members 5 at both ends is disposed. As shown in FIG. 4, each cam member 5 is formed in an oval shape having a base circle portion 5a and a cam top portion 5b, and does not laterally shift to a groove-shaped cam receiving portion 4f recessed on the upper surface of the flange 4b. Is engaged. The cam member 5 is normally held in a forward posture in which the cam top portion 5b faces forward. In this state, the lower surface of the bottom plate 2a of the leg support portion 2 comes into contact with the base circle portion 5a of the cam member 5 from above, and the leg support portion 2 is supported at a normal position.

The base plate 4 is provided with a cylinder-type actuator 7 having a built-in explosive to be ignited at the time of a collision, and a wire 8 derived from the actuator 7 is wound around a rotary shaft 6. The actuator 7 operates to pull the wire 8 by ignition of the built-in explosive at the time of a collision.

Thus, at the time of a collision, the rotation shaft 6 is rotated via the wire 8 by the operation of the actuator 7, and the cam member 5 is rotated from the forward posture to the upward posture.
(B) As shown in FIG.
a, the leg support portion 2 is pushed up, and the main body portion 1 is tilted forward and upward via the wire spring 1a.

The leg support 2 may be integrated with the main body 1 so that the entire seat cushion is tilted upward.
, The main body 1 may not be tilted, and only the leg support 2 may be pushed up.

[0016]

As is apparent from the above description, according to the present invention, the front end of the seat cushion can be reliably pushed up in the event of a collision, and the reliability is improved. Individuals are sufficient and costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a short cushion of a vehicle seat to which the present invention is applied.

FIG. 2 is a perspective view of the seat cushion of FIG. 1 with a pad removed;

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2;

FIG. 4A is a perspective view showing an arrangement portion of a cam member.
(B) Perspective view of main part showing state at the time of collision

[Explanation of symbols]

 2 Leg support (front end of seat cushion) 5 Cam member 6 Rotary shaft 7 Actuator 8 Wire

Claims (1)

[Claims] 1. A vehicle seat provided with an actuator that operates in the event of a collision, wherein the front end of a seat cushion is pushed up by the operation of the actuator. Both ends of a horizontally long rotating shaft that is rotated via a wire by the operation of the actuator. A seat member for a vehicle, wherein a front end portion of a seat cushion is pushed up by rotation of the cam member.