JPH04166456A - Air bag device for rear seat - Google Patents

Abstract

PURPOSE:To improve safety and economical efficiency by providing an air bag device with a seat position switch brought into an ON-state when the inclination angle of a seat back is within a given allowable range and a seating switch brought into an ON-state by means of a seating signal. CONSTITUTION:When a seating passenger is absent at a rear seat 21 being an air bag 11 mounted seat 1 and a seat back 3 of the air bag 11 mounted seat 1 is not within the angle range of a given allowable range, a seat position switch 28 and a seating switch 25 are not brought into an ON-state. Even when an impact sensing sensor 30 is in a state to sense an impact, a gas generator 13 of an air bag device 11 for a rear seat is not actuated. Thus, the air bag device 11 for a rear seat is prevented from useless working, the unnecessary increase of an internal pressure of a car room is prevented from occurring, and a passenger seating a rear seat 21 can be reliably constrained and protected. This constitution improves safety and economical efficiency.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rear seat airbag device, and more specifically, to a rear seat airbag device attached to the back side of a seat pack of a front seat. .

[Conventional technology]

2. Description of the Related Art Conventionally, an airbag mounting seat described in Japanese Utility Model Publication No. 51-35730 has been known as a protection device for rear seat occupants of vehicles.

In this conventional example, when the front seat back rotates around the lower part of the seat back due to the secondary impact reaction force of the rear seat occupant, the airbag deploys in an appropriate direction so that the rear seat occupant can be restrained. The mounting portion is configured to be bendable relative to the seat back, and the mounting portion is connected by a connecting rod that can rotate around a point different from the center.

[Problem to be solved by the invention]

However, in conventional airbag seats, the seat back has a parallel link mechanism and is configured to fold in the middle, so when an occupant sits on the airbag seat and operates the reclining mechanism. To,
The seat position becomes unnatural, the distance between the rear seat occupant and the airbag device changes, and the airbag device's ability to restrain the rear seat occupant is impaired, and the strength and looseness of the parallel link mechanism becomes a problem. It was something that I had.

In addition, it is wasteful to activate the rear seat airbag system when there is no passenger or seated person in the rear seat, and it increases the cabin pressure unnecessarily, which may damage the eardrums of the passenger or seated person. There was a risk that the

An object of the present invention is to be able to reliably satisfy the restraining performance of an airbag device for a rear seat occupant, and to prevent the airbag device from being activated even if a shock sensor detects an impact when there is no occupant in the rear seat. To provide an airbag device for a rear seat that is excellent in safety and economy, and does not operate in vain or unnecessarily increase the pressure inside a vehicle.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned problems, and includes a rear seat airbag device installed on the back side of the seatback of the front seat, in which the inclination angle of the seatback of the seat equipped with the airbag falls within a predetermined allowable range. a seatback inclination angle detection device that detects that the angle is within the angle range; and a seating sensor that detects a seated person on the rear seat of the seat equipped with the airbag; A seat position switch that is turned on when the inclination angle of the airbag is within a predetermined allowable angle range, and a seating switch that is turned on in response to a seating signal from the seating sensor are disposed in the airbag device. do.

[Function] According to the present invention, when there is no occupant in the rear seat of the seat equipped with an airbag, and when the seat back of the seat equipped with an airbag is not within a predetermined allowable angle range, the seat position switch and the seating position switch are activated. If the switch does not turn on, the gas generator for the rear seat airbag system will not operate even if the impact sensor detects an impact, which may cause the rear seat airbag system to operate unnecessarily. This prevents unnecessary increases in vehicle interior pressure.

[Example: Hereinafter, a rear seat airbag device according to the present invention will be described in detail with reference to the drawings.

1 to 3 schematically show an embodiment of the present invention, in which a vehicle front seat 1 has a seat cushion 2.
and a seat back 3, etc., erected on the rear end side. As is well known, the seat back 3 is connected and supported to the seat cushion 2 via a reclining mechanism 6 consisting of a base 7 and an arm 9 pivotally supported by a rotating shaft support 8. As the reclining mechanism 6, a power reclining device using an electric motor or the like may be employed.

An air bank device 1 is provided on the back side of the seat back 3. As shown in FIG. 2, this airbag device 11 includes a base plate 12 attached to a seat back frame, a gas generator 13 fixed to the second base plate 12, and an airbag device 11 that is inflated by the operation of the gas generator 13. It is equipped with an Air No. ＼g main body 14.

In addition, the front seat 1 for a vehicle as a seat equipped with an airbag
A vehicle rear seat 21 is disposed on the rear side of the vehicle, and the vehicle rear seat 21 includes a seat cushion 22 and a seat back 23 erected on the rear end side.
A seating sensor 24 composed of, for example, a pressure-sensitive element, for detecting a seated person is disposed on a seat cushion 22 that interfaces with the airbag device 11 of the front seat l. Incidentally, as the seating sensor 24, an optical sensor or the like built into the back surface of the seat back 3 of the front seat I can be used.

As shown in FIG. 1, the seat back 3 of the front seat 1 is arranged along a straight line θ that is inclined rearward by about 25 degrees with respect to the vertical line Y, and in a normal seating state, the seat back 3 moves forward and backward around θ. Straight g tilted about 10 degrees in the direction! It is used in the range shown by L1 and L2. Furthermore, the allowable range for the operation of the airbag device 11 with respect to the inclination angle of the seat back 3 is preferably a range of a straight line L3 at an angle α rearward from the vertical line Y. vertical line Y
If the seatback 3 is tilted further forward, the airbag body 14 will bulge out toward the face of the occupant in the rear seat 21, and if the seatback 3 is tilted further back than the straight line L3, the rear seat will be inflated. The airbag main body 14 bulges toward the feet of the passenger 21, and the airbag device 11 cannot fully exhibit its occupant restraint performance. The angle α between the vertical line Y and the straight line L3 is preferably in the range of 15° to 45°.

A seat back 3 inclination angle detection device 26 is provided for detecting that the inclination angle of the seat back 3 is within a predetermined allowable angle range, and this inclination angle detection device 26 is provided on the rotation shaft support 8. The seat back 3 is formed by a rotary encoder or the like, and the inclination angle detecting device 26 detects the seat back 3.
A seat position switch 28 is provided which is turned on when the inclination angle of the seat is within a predetermined angle range.

As shown in FIG. 3, an impact sensor 30 provided on the vehicle body is connected to the gas generator 13 of the airbag device 11, and a seat position switch is connected in series between the gas generator 13 and the impact sensor 30. 28, and a seating switch 2 that is turned on by the seating signal from the seating sensor 24.
5 is connected. Incidentally, the impact sensing sensor 30 is arranged in a plurality of stages, and these are connected in series. In addition, the seat position switch 28 and impact detection sensor 30
The arrangement position can be changed as appropriate.

According to this configuration, even if the impact sensor 30 detects an impact, this sensing signal is not transmitted to the gas generator 13 when there is no occupant in the rear seat of the seat equipped with the airbag. If the seatback 3 of the front seat 1 as the seat equipped with an airbag is not within the predetermined permissible angle range, the occupant restraint performance will be poor and the operation of the airbag device 11 may pose a danger to the occupant. Gas generator 13
is not working.

[Effects of the Invention] The above is the configuration of an embodiment of the rear seat airbag device according to the present invention. A seat position switch of a seatback inclination angle detection device that detects the presence of a vehicle, and a seat switch of a seating sensor that detects a passenger in the rear seat are connected to the gas generator and impact detection sensor of the airbag device. Therefore, if there is no occupant in the rear seat of the seat equipped with an airbag, or if the seatback of the seat equipped with an airbag is not within the specified allowable angle range, the seat position switch and seating switch will not turn on. , even if the impact sensor detects an impact, the gas generator for the rear seat airbag system will not operate, preventing unnecessary activation of the rear seat airbag system and reducing unnecessary cabin pressure. It is possible to prevent the vehicle from rising, and it is also possible to reliably restrain and protect rear seat occupants under specified conditions.
It is possible to obtain a rear seat airbag device that is highly safe and economical.

[Brief explanation of the drawing]

1 to 3 schematically show an embodiment of the rear seat airbag device according to the present invention, with FIG. 1 being a side view showing only the configuration of the main parts, and FIG. A cross-sectional view showing the device, and FIG. 3 is a wiring diagram. In the figure, 1... Vehicle front seat, 2... Seat cushion, 3... Seat back, 6... Reclining mechanism, 6a... Electric motor, 11... Air bag device, DESCRIPTION OF SYMBOLS 12... Base plate, 13... Gas generator, 14... Airbag body, 21... Vehicle rear seat, 24... Seating sensor, 25... Seating switch, 26... Tilt Angle detection device, 28... Seat position switch, 30... Shock detection sensor.

Claims (1)

[Claims] (1) In a rear seat airbag device attached to the back side of the seatback of the front seat, the seatback detects that the inclination angle of the seatback of the seat equipped with the airbag is within a predetermined allowable angle range. a tilt angle detection device;
a seating sensor that detects a seated person on a rear seat of the airbag-equipped seat, and the seat is turned on when the seatback inclination angle is within a predetermined allowable angle range by the seatback inclination angle detection device. An airbag device for a rear seat, characterized in that the airbag device includes a position switch and a seating switch that is turned on in response to a seating signal from the seating sensor.