JPH05286386A - Seat in vehicle - Google Patents

Abstract

PURPOSE:To prevent the generation of a submarine phenomenon and improve the comfortableness of a seat cushion and attempt its lightening by restricting a thigh before the forward movement of an occupant on the seat cushion. CONSTITUTION:The seat cushion 12 of a vehicular seat 10 is divided in two pieces like a seat cushion front part 12A and a seat cushion rear part 12B at the front side of a contact position with an occupant's pelvis. Rotary shafts 28 are provided respectively on the upper end parts 26A of brackets 26 erected on a floor panel 11 and the front end lower part of both side wall parts 16A of a seat cushion frame front 16 are pivoted rotatably on these rotary shafts 28. An actuator 30 is installed on a nearly central part in a seat cushion width direction downward the rear end of the seat cushion front part 12A and when a deceleration sensor 40 detects a deceleration beyond a prescribed value, the rear end part of the seat cushion front part 12A is moved 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 that reduces the amount of forward movement of an occupant seated on a seat cushion during rapid deceleration of the vehicle.

[0002]

2. Description of the Related Art When a vehicle suddenly decelerates, the occupant tends to move forward due to inertial force. At this time, the occupant sinks into a seat cushion, which is a so-called submarine phenomenon. In some cases, the lumbar region cannot be completely restrained.

In order to prevent the occurrence of the submarine phenomenon, when the vehicle suddenly decelerates, the front portion of the seat cushion instantly rises and restrains the thigh of the occupant.
A vehicle seat that reduces the amount of forward movement is known (see Japanese Utility Model Laid-Open No. 2-21134).

In such a vehicle seat, as shown in FIG. 3, when the vehicle is suddenly decelerated, the forward slip prevention member 72 positioned substantially horizontally inside the front portion of the seat cushion 70 in a normal running state, A load transmission member 76 connected to the seat belt 74 causes the shaft 78 to move upward (see FIG. 3).
Is rotated in the direction of arrow U) to lift the front portion of the seat cushion 70.

[0005]

However, in this vehicular seat, since the front deviation preventing member 72 is located in front of the seat cushion 70, the front deviation preventing member 72 restrains the thigh 80A of the occupant 80. Up to crew 8
The forward movement of 0 becomes large. For this reason, the occurrence of the submarine phenomenon may not be prevented unless the amount of protrusion of the front deviation prevention member 72 is increased.

Further, since the front deviation preventing member 72 needs to be arranged under the cushion pad, the seated occupant may feel a foreign object even in a normal running state.
To prevent this, thicken the cushion pad,
Alternatively, a measure to make it hard is taken, but this increases the weight of the seat cushion 70 and makes it uncomfortable to sit on.

In consideration of the above facts, the present invention prevents the occurrence of the submarine phenomenon by restraining the thighs at an early stage when the occupant moves forward on the seat cushion, and improves the riding comfort of the seat cushion. An object of the present invention is to obtain a vehicle seat that can be reduced in weight.

[0008]

A vehicle seat according to the present invention includes a seat cushion divided into two parts, a seat cushion front part and a seat cushion rear part, in front of a contact position with an occupant's pelvis, and the seat cushion. Support means provided at the lower front end of the front portion for rotatably supporting the seat cushion front portion around a rotation axis along the seat cushion width direction; deceleration detection means for detecting deceleration of a predetermined value or more; Drive means provided at the lower rear end of the front portion of the seat cushion, which is activated when the deceleration detecting means detects a deceleration of a predetermined value or more, and pushes up the rear end portion of the front portion of the seat cushion upward. Is characterized by.

[0009]

In the vehicle seat according to the first aspect of the present invention, when the deceleration detecting means detects the deceleration of the predetermined value or more during the rapid deceleration of the vehicle, the driving means is actuated to operate the front portion of the seat cushion. Push the rear end up. As a result, the seat cushion front portion is provided around the lower front end and rotates about the rotation axis of the support means along the vehicle width direction, and the seat cushion front rear end located in front of the contact position with the pelvis of the occupant. The part projects upward.

Therefore, when the occupant attempts to move forward of the vehicle due to inertial force, the thigh of the occupant is restrained by the rear end of the front portion of the seat cushion early in the movement. Therefore, the thigh portion of the occupant can be restrained while the forward movement amount of the occupant is small, so that the rear end portion of the front portion of the seat cushion can be lifted less and the driving means can be made smaller and lighter. Further, unlike the conventional structure, it is not necessary to dispose the forward slip preventing material for restraining the occupant's thighs below the front portion of the seat cushion, so that it is possible to reduce the weight and when the occupant is seated. In addition, you do not feel a foreign body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle seat of the present invention will be described with reference to FIGS. In the figure, an arrow FR indicates a vehicle front direction, and an arrow UP indicates a vehicle upward direction.

As shown in FIG. 2, the vehicle seat 10 according to this embodiment includes a seat cushion 12 and a seat back 14.
The seat cushion 12 is provided with a seat cushion front portion 12A and a seat cushion rear portion 12 at a substantially central portion in the seat front-rear direction, which is in front of a contact position with the pelvis of an occupant.
It is divided into two parts.

The seat cushion front portion 12A is composed of a seat cushion frame front 16 and a cushioning material and a skin attached around the seat cushion frame front 16, and the seat cushion rear portion 1 is provided.
2B is composed of a seat cushion frame rear 18, and a cushion material and a skin attached around the seat cushion frame rear 18.

As shown in FIG. 1, the rear end portions of both side wall portions 18A of the seat cushion frame rear 18 are fixed to the floor panel 11 via brackets 13. In addition, both side wall portions 18 of the seat cushion frame rear 18
The front end of A is fixed to the floor panel 11 via a bracket 20.

In front of the bracket 20 of the floor panel 11, a bracket 26 as a support means is provided upright. Rotating shafts 28 along the seat cushion width direction are provided at upper end portions 26A of these brackets 26, respectively, and lower front ends of both side wall portions 16A of the seat cushion frame front 16 can rotate on these rotating shafts 28. Is supported by.

Therefore, the seat cushion front portion 12A is
A clockwise rotation direction of FIG.
Arrow A direction) and the counterclockwise rotation direction of FIG. 1 (arrow B of FIG. 1)
Direction).

As shown in FIG. 2, an actuator 30 as a driving means is arranged vertically in the seat cushion width center substantially below the rear end of the seat cushion front portion 12A.

As shown in FIG. 1, the actuator 30 is fixed to the floor panel 11 by screws (not shown) or the like. In addition, the actuator 30 is a cylinder 32.
And a piston 34, and a lower end portion of a rod 28 inserted from an upper wall portion 32A of the cylinder 32 is connected to the piston 34.

At the upper end of the rod 28, a rectangular sliding block 36 as a driving means is pivotally supported so as to be swingable in the clockwise rotation direction and the counterclockwise rotation direction in FIG. This sliding block 36 is a seat cushion frame front 16
It is in contact with the lower surface of the bottom portion 16B and is slidable in the front-rear direction. Seat cushion frame front 1
The rear edge portion of the bottom portion 16B of 6 is bent downward and the stopper 1
It is 6C. This stopper 16C has a rod 2
8 moves in the upward direction (direction of arrow C in FIG. 1), the sliding block 36 slides on the lower surface of the bottom portion 16B of the seat cushion frame front 16, and moves in the rear direction (direction of arrow D in FIG. 1). The sliding block 36 comes into contact with the seat cushion front portion 12A, and the sliding block 36 comes into contact with the stopper 16C so that the seat cushion front portion 12A stops at a predetermined position.

A gas generating agent 38 is filled in the lower chamber in the cylinder 32 partitioned by the piston 34.
This gas generating agent 38 is provided with an ignition device connected to a deceleration sensor 40 as a deceleration detecting means. The gas generating agent 38 is used when the deceleration sensor 40 detects a deceleration of a predetermined value or more. Is ignited by an ignition device and burns to generate gas. The generated gas causes the piston 34
Is moved in the direction of arrow C in FIG.

Next, the operation of this embodiment will be described. In the vehicle seat 10 of the present embodiment, when the deceleration sensor 40 detects a deceleration of a predetermined value or more during the rapid deceleration of the vehicle, the gas generating agent 38 is ignited by the igniter to burn and generate gas. The generated gas causes the piston 34 to move to the position shown in FIG.
Move in the direction of arrow C. As a result, the sliding block 36 connected to the piston 34 by the rod 28 slides on the lower surface of the bottom portion 16B of the seat cushion frame front 16 and moves in the direction of arrow D in FIG. The seat cushion front portion 12A is swung in the direction of arrow B in FIG.
Push up on the rear end of the.

As a result, the rear end portion of the seat cushion front portion 12A located in front of the contact position of the occupant 31 with the pelvis projects upward. Further, the sliding block 36 is the stopper 1
By contacting 6C, the seat cushion front portion 12A stops at a predetermined position (the position indicated by the imaginary line in FIG. 1).

Therefore, when the occupant 31 tries to move to the front of the vehicle due to inertial force, the thigh 31A of the occupant 31 is restrained by the rear end of the seat cushion front portion 12A early in the movement. Therefore, the thigh 31A of the occupant 31 can be restrained while the amount of forward movement of the occupant 31 is small, so that the amount of lift of the rear end portion of the seat cushion front portion 12A can be small and the driving means can be made small and lightweight. it can. Further, unlike the conventional structure, it is not necessary to dispose the forward slip preventing material for restraining the occupant's thighs below the front portion of the seat cushion, so that it is possible to reduce the weight and when the occupant is seated. To
Do not feel a foreign body.

[0024]

In the vehicle seat according to the present invention, the driving means is actuated when the vehicle is suddenly decelerated, and the rear end of the seat cushion is pushed upward to restrain the thighs. By restraining the thigh at an early stage of moving the ankle, the submarine phenomenon can be prevented from occurring. Further, since the member for preventing the submarine is not provided in the vicinity of the front end portion of the seat cushion, it has an excellent effect that the weight can be reduced and the riding comfort of the seat cushion can be improved. ..

[Brief description of drawings]

FIG. 1 is a side view showing a seat cushion of a vehicle seat according to an embodiment of the present invention.

FIG. 2 is a perspective view of a vehicle seat according to an embodiment of the present invention as seen obliquely from the front of the vehicle body.

FIG. 3 is a schematic side view showing a conventional vehicle seat.

[Explanation of Codes] 10 Vehicle Seat 12 Seat Cushion 12A Seat Cushion Front 12B Seat Cushion Rear 16 Seat Cushion Frame Front 16B Bottom 16C Stopper 26 Bracket (Supporting Means) 28 Rotating Shaft 30 Actuator (Drive Means) 32 Cylinder 34 Piston 36 Sliding block (driving means) 40 Deceleration sensor (deceleration detection means)

Claims (1)

[Claims] 1. A seat cushion divided into two parts, a seat cushion front part and a seat cushion rear part, in front of a position where the occupant makes contact with the pelvis, and a seat cushion front part provided at a lower front end of the seat cushion front part. A support means for rotatably supporting the seat cushion about a rotation axis along the seat cushion width direction, a deceleration detection means for detecting a deceleration of a predetermined value or more, and a deceleration device provided at a lower rear end of the seat cushion front portion. A vehicle seat comprising: a driving unit that is activated when the speed detecting unit detects a deceleration equal to or higher than a predetermined value and pushes up a rear end portion of the front portion of the seat cushion.