JPH0781466A - Lower structure of seat for regulating forward movement of occupant - Google Patents

Abstract

PURPOSE:To keep a cushion property while regulating surely the forward movement of an occupant by providing an air bag module on the floor of the lower part of a seat cushion and a plate member operable front on the upper part of the air bag module to lift the plate member with the expanded air bag to the front opened inclined condition. CONSTITUTION:An air bag module 7 is provided in a recess 6 formed in a floor 5 on the lower part of a seat cushion 4 and covered on the upper side with a plate member 9 to be operable front about a hinge 8 on the rear side. The plate member 9 covers the recess 6 along the floor 5 and the cushion property of the seat cushion 4 is not hindered. In the collision of cars, an air bag 7a of the air bag module 7 is unfolded and expanded upward according to a signal detected by a sensor S to lift the plate member 9. Since the rear end of the plate member 9 is fixed by a hinge 8, it is opened front and inclined to enter the lower part of the seat cushion 4 and increase the density thereof, harden the seat cushion and regulate the forward movement of the waste H of an occupant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat lower structure for restricting forward movement of an occupant.

[0002]

2. Description of the Related Art As a seat lower part structure for restricting forward movement of an occupant, for example, one shown in FIG. 3 is known (for a similar structure, see Japanese Utility Model Laid-Open No. 57-111249). Reference numeral 1 is a seat cushion, and a floor 3 below the seat cushion 1 is provided with a protrusion 3 having a front rising slope 3a. The occupant's waist H at the time of sudden braking due to a vehicle collision or the like from the front rising slope 3a.
The forward movement of the car is regulated to protect passengers.

[0003]

However, in such a conventional technique, since the projection 3 is formed on the floor 2 below the seat cushion 1, the cushioning property of the seat cushion 1 is hindered. I can't get a comfortable seating feeling.

The present invention has been made by paying attention to such a conventional technique, and provides a seat lower structure for restricting forward movement of an occupant whose cushioning property is not hindered.

[0005]

In order to achieve the above object, a seat lower structure for restricting forward movement of an occupant according to the present invention is provided with a signal from a sensor installed on a vehicle body on a floor below a seat cushion. An airbag module for inflating the airbag upward only when necessary is provided, and a plate material that can be opened frontward is provided around the hinge at the rear end at the top of the airbag module, and the plate material is lifted by the inflated airbag. It is in a state of a certain forward opening inclination.

[0006]

According to the present invention, the airbag is inflated upward and lifts the plate member to bring it into a constant forward-opening inclined state when the vehicle crashes or the like is required. Certainly regulated. In other normal times, since the plate member is in the non-inclined state, the cushioning property of the seat cushion is not impaired and a satisfactory seating feeling is obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. It should be noted that the description overlapping with the conventional one is omitted.

A seat cushion 4 is formed of a foamed polyurethane foam material and has a surface covered with a cloth or a vinyl film. The floor 5 below the seat cushion 4 is slightly inclined forward and upward, but is generally flat as a whole. A recess 6 is formed on the floor 5 slightly in front of the occupant's waist H, and an airbag module 7 is installed in the recess 6. Further, the upper side of the recess 6 is covered with a plate material 9 which can be opened frontward around the hinge 8 on the rear side. A rubber 10 for receiving the front end of the plate member 9 is provided on the front side of the recess 6. The plate member 9 covers the recess 6 just along the floor 5, and the lower portion of the seat cushion 4 is close to the plate member 9. Therefore, in normal times, the cushioning property of the seat cushion 4 is not impaired, and a good seating feeling for the occupant can be obtained.

The airbag module 7 installed in the recess 6 accommodates a bag-shaped airbag 7a inside in a folded state. The airbag module 7 is connected to a sensor S provided in a key part of the vehicle body, and only when a signal is received from the sensor S, the built-in drug is exploded and the generated gas causes The airbag 7a is adapted to be expanded and inflated upward. The sensor S connected to the airbag module 7 is the same as that used in a normal airbag system provided on the steering wheel or the like, and detects the deceleration of the vehicle.

Therefore, when the vehicle suddenly brakes due to a vehicle collision or the like, the sensor S detects the phenomenon and sends a signal to the airbag module 7. When the airbag module 7 receives the signal, the medicine contained therein is exploded and gas is sent to the airbag 7a. The airbag 7a expands and inflates upward to lift the plate member 9 upward. Since the rear end of the plate member 9 is fixed by the hinge 8, the plate member 9 is lifted by the airbag 7a to be brought into a constant front opening inclination state (see FIG. 2). Therefore, the plate member 9 in the inclined state enters the lower portion of the seat cushion 4 and is hardened by increasing the density of the seat cushion 4, and the forward movement of the waist H of the occupant is restricted,
It is possible to protect passengers.

[0011]

The seat lower structure for restricting the forward movement of the occupant according to the present invention has the contents as described above, and the airbag is inflated upward to expand the plate material when necessary such as in the case of a vehicle collision. Since the plate member is lifted and brought into a constant front-opening inclined state, the forward movement of the occupant is reliably restricted by the plate member. In other normal times, since the plate member is in the non-inclined state, the cushioning property of the seat cushion is not impaired and a satisfactory seating feeling is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a lower seat structure for restricting forward movement of an occupant according to an embodiment of the present invention.

FIG. 2 is a view showing a case where the plate material is in a front opening inclined state.
It is a considerable sectional view.

FIG. 3 is a cross-sectional view showing a conventional lower seat structure for restricting forward movement of an occupant.

[Explanation of symbols]

 4 Seat cushion 5 Floor 7 Airbag module 7a Airbag 8 Hinge 9 Plate material S sensor H Lumbar area of occupant

Claims (1)

[Claims] 1. An airbag module for inflating an airbag upward only when necessary by a signal from a sensor installed in a vehicle body is provided on a floor below a seat cushion, and a rear end hinge is provided on an upper portion of the airbag module. A seat lower structure for restricting forward movement of an occupant, characterized in that a plate member which can be opened frontward is provided around the center, and the plate member is lifted by an inflated airbag and brought into a constant front opening inclined state.