JPH1178758A - Seat for vehicle having air bag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for a vehicle having an air bag device to protect a passenger from sideways collision. SOLUTION: In this seat for a vehicle having an air bag device, the development portion of the air bag 2 of an air bag device 1 arranged on the back of the side of a seat back 4 is positioned at a sewn part 6 between the framework covering part 5b of a bag-form seat cover 5 covered with a seat back 4 and a seat back covering part 5c. A belt-like stay cloth 9 having one end coupled to a seat back frame 8 through a mounting metal fitting 7 is sewn to the sewn edge of the framework covering part 5b to draw the framework covering part 5b, and the air bag 2 is expanded through the mark of the sewn part 6 between the framework covering part 5b broken by the development force of the air bag 2 and the seat back covering part 5c toward the given position of the side of the seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat provided with an airbag device for protecting an occupant from a side collision.

[0002]

2. Description of the Related Art An occupant is restrained laterally by an airbag which is broken by the deployment pressure of an airbag of an airbag device in which a seatcover covered by a seatback is embedded in a side surface of the seatback and which is expanded to the side. A vehicle seat provided with an airbag device is disclosed in JP-A-6-64491.
It is publicly known from Japanese Patent Publication No.

However, a conventional vehicle seat equipped with this type of airbag device is designed to be torn by breaking of the seat cover material itself near the sewn portion on the side of the seat surface covering portion. Is made of a low-strength material, so that the durability of the seat cover itself cannot be assured, and furthermore, there is a problem that the break points are not fixed and the deployment trajectory of the airbag is not stable. In addition, there is a restriction that the strength of the sewing thread must be higher than the strength between the perforations of the seat cover material, and a high balance in quality and technology is required between the seat cover material and the sewing thread, resulting in poor productivity. There is also a problem that the response is inferior because the seat cover material itself breaks.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and does not break the conventional seat cover material itself. The sewing thread that stitches the airbag can be reliably and quickly broken at a predetermined deployment pressure to easily cleave the sewn portion, and the broken portion is always constant to stabilize the deployment trajectory of the airbag. In addition, the balance between the strength of the seat cover material and the sewing thread can be easily obtained, the productivity can be greatly improved, and the durability as a seat can be guaranteed for a long time. It has been completed for the purpose of providing a vehicle seat provided with a bag device.

[0005]

A vehicle seat provided with an airbag device according to the present invention, which has been made to solve the above-mentioned problems, comprises a bag-shaped seat cover covered with a seat back and a seat. A band-shaped webbing with one end connected to the seatback frame via a mounting bracket while positioning the airbag deployment site of the airbag device arranged on the back of the side of the seatback at the seam with the back cover. A predetermined position on the side of the seat from the mark of the sewn portion between the sewn portion and the back portion of the seat, which is sewn to the sewn edge of the sewn portion and is pulled by the deployment pressure of the airbag. The airbag is adapted to be inflated toward the airbag.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 denotes an airbag device, which is an airbag device 1 in which an inflator (not shown) and an airbag 2 are housed in an airbag case 3 and which is buried in the back of a side portion of a seat back 4. Normally, the airbag 2 is concealed by the seat cover 5 covered by the seatback 4, but in an emergency, the airbag 2 bulges out of the opening of the airbag case 3 between the occupant and the cabin wall by the operation of the inflator. The seat cover 5 is broken and the airbag 2 is inflated toward a predetermined position on the side of the seat to protect the occupant against a collision from the side.

The seat cover 5 used in the present invention
Is a bag-shaped sewing cover in which the seat surface covering portion 5a, the gusset covering portion 5b, and the seat back covering portion 5c are sewn at each of the sewn portions. The sewing thread of the stitching portion 6 of the gusset covering portion 5b and the seat back covering portion 5c located at the deployment site of the airbag 2 is broken not by the predetermined deployment pressure of the airbag 2 but by the breakage of a part of the material itself. The sewn portion 6 is torn and the airbag 2 is inflated and deployed.

Further, one end of a band-shaped webbing 9 whose leading end is connected to a seat back frame 8 via a mounting bracket 7 is sewn to the machichi covering portion 5b, so that the sewn portion 6 is securely torn. The airbag 2 is configured to inflate and deploy in a predetermined direction at a predetermined position from the trace opening. That is,
When the airbag 2 is inflated and deployed, the sewing thread of the seam 6 of the gusset covering portion 5b and the seat back covering portion 5c located at the deployed portion of the airbag 2 is broken at a predetermined deployment pressure of the airbag 2. However, at this time, the camachi covering portion 5b
The webbing 9 is sewn to pull inward the joint side of the gusset covering portion 5b with the seat back covering portion 5c, and is prevented from opening outward following the deployment of the airbag 2. Become. As a result, only the seat back cover portion 5c opens outward following the deployment of the airbag 2, and the sewn portion 6 is always in a constant condition with the airbag 2 stably inflated and deployed. It becomes.

As the mounting bracket 7 for connecting the belt-shaped webbing 9 to the seat back frame 8, for example, as shown in the figure, a board portion having a substantially L-shaped cross section is fastened to the seat back frame 8 with screws or the like. The webbing 9 can be fixed with the tool 10 and the webbing 9 can be inserted into the slit at the tip. Also,
The seat back frame 8 includes a seat back cover 5.
c for fixing the end of the fastener 1
0 and is similarly fixed, so that the webbing 9 and the seat cover 5 can be mounted with an extremely simple structure.

[0010] In the above-described structure, when the airbag 2 is inflated, the seat back cover 5c is first pressed by the developing pressure.
Even if the suturing portion 6 of the gusset covering portion 5b and the seat back covering portion 5c located in the developing direction is sewn together with a sewing thread, the gusset covering portion 5b is sewn with the force cloth 9 for pulling the edge thereof inward. Since the cover 5b is prevented from opening outward following the deployment of the airbag 2, only the seat back cover 5c is opened outward following the deployment of the airbag 2, The airbag 2 is stably inflated and deployed under the condition that the suturing portion 6 is always in a constant position at a constant position and in a constant direction. In addition, the belt-shaped webbing 9 connected to the seat back frame 8 at the other end thereof via the mounting bracket 7 is sewn to the machichi covering portion 5b, and
The end of the seat back covering portion 5c is also fixed to the seat back frame 8 by the mounting bracket 11 in the same manner.
The webbing 9 and the seat cover 5 can be mounted very easily, and the productivity of the seat can be greatly improved.

[0011]

As is apparent from the above description, the present invention does not break the conventional seat cover material itself, but sews the seam covering portion of the seat cover and the seat back covering portion. The airbag can be ruptured reliably and quickly at a predetermined deployment pressure to easily cleave the sewn portion, and the rupture point can be constantly fixed to stabilize the deployment trajectory of the airbag. The strength of the cover material and the sewing thread can be easily balanced, productivity can be greatly improved, and the durability of the sheet can be guaranteed for a long period of time. Therefore, the present invention greatly contributes to industrial development as a vehicle seat provided with an airbag device for protecting an occupant against a collision from the side, which has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a main part showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part showing the embodiment of the present invention.

FIG. 3 is an overall perspective view showing the embodiment of the present invention as viewed from the rear side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airbag apparatus 2 Airbag 4 Seatback 5 Seat cover 5b Kamachi covering part 5c Seat back covering part 7 Mounting bracket 8 Seatback frame 9 Power cloth 10 Fastener 11 Mounting bracket

Claims (2)

[Claims] 1. A bag-shaped seat cover (5) covered by a seat back (4) and a back cover (5b) and a back cover (5b).
At the seam (6) with the (5c), the deployment area of the airbag (2) of the airbag device (1) located on the back side of the seatback (4) is located and the seatback frame (8) A band-shaped webbing (9), one end of which is connected via a mounting bracket (7), is sewn to the sewn edge of the camach coating (5b), and
(5b) is pulled, and the seam joint (5b) and the back cover (5c) of the seat are broken by the deployment pressure of the airbag (2).
(6) Airbag facing the specified position on the side of the seat from the mark
(2) A vehicle seat equipped with an airbag device, characterized in that the seat is inflated. 2. A mounting bracket (11) is connected to the other end edge of the seat back cover (5c), and the mounting bracket (11) is attached to the seat back frame (8) together with the mounting bracket (7) of the webbing (9). A vehicle seat provided with the airbag device according to claim 1, wherein the vehicle seat is fixed to the vehicle seat by a fastener (10) such as a screw.