JP2000052912A - Airbag built-in seat - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a seat with a built-in airbag which can prevent the cover member from being broken when the airbag is deployed, and which can exhibit the regular deployment performance of the airbag. The cover member covers a seat back.
The airbag storage section of the seat back main fabric 25a
And the side gusset cloth 25b are sewn together. The airbag module 30 includes a case 3 containing an airbag 32, an inflator 33, and the like.
1 is provided. In the front part of this case 31, a sewn portion 2 of the seat back main fabric 25a and the side gusset fabric 25b
A front opening 40 that opens to face 6 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In an airbag device mounted on a vehicle such as an automobile, an airbag is instantly inflated by an inflator at the time of a collision, so that a secondary collision of an occupant with a member in a vehicle compartment is suppressed. It has become. The position where the airbag device is provided is in front of the occupant in the case of a frontal collision, that is, in the center pad of the steering wheel or in the vicinity of the glove box in front of the front passenger seat. Side airbags are effective.

For example, a conventional seat 1 with a built-in side airbag shown in FIG.
The airbag module 4 is built in the vehicle, and the inflator 5 is activated by a signal output from a sensor at the time of a side collision of the vehicle, so that the airbag 6 is inflated by gas generated by the inflator 5.

The seat back 2 includes a frame 7, a pad 8, a cover member 9, and the like. The seat back main cloth 9a, the side gusset cloth 9b and the pressure applied from the inside of the cover member 9 when the airbag 6 is deployed. The airbag 6 bulges forward (in the direction indicated by the arrow F) of the seat back 2 as indicated by a two-dot chain line from the broken portion, and the airbag 6 extends from the side of the occupant to the side of the head. And the like can be protected. The airbag 6 is housed in the case 15 together with the inflator 5.

[0005] The case 15 includes a case body 15a fixed to the seat back frame 7, and a lid (lid) 15 provided at a position of the case body 15a near the side gusset cloth 9b.
b. The lid 15b is openable and closable with the hinge 16 as a boundary, and as shown in FIG.
The lid 15b can be closed by being hooked on the receiving portion 18 formed on the 5b.

[0006]

In the airbag module 4, when the airbag 6 is deployed, the airbag module 4 shown in FIG.
As shown in FIG.
Is opened, the airbag 6 is deployed. As shown in FIG. 10, the inflator 5 is housed inside the case 15, and the gas outlet 5 of the inflator 5 is provided.
The gas gushes out from a, and the lid 15b opens to the side of the seat.

In the conventional example, when the lid 15b is opened, the front edge C of the lid 15b and the like strongly hits the side gusset cloth 9b (shown in FIG. 7), so that the contact portion between the front edge C and the side gusset cloth 9b is formed. Stress concentration occurs and side gusset fabric 9
There is also a possibility that the airbag 6 is deployed while b is torn. In this case, the deployment pressure of the airbag 6 is less likely to be applied to the sewn portion 10, which may affect the deployment performance of the airbag 6.

Accordingly, an object of the present invention is to provide an airbag built-in sheet which can prevent a cover member such as a side gusset material from being broken when the airbag is deployed, and which can exhibit the regular deployment performance of the airbag. Is to do.

[0009]

According to the present invention, there is provided an airbag with a built-in airbag module in which an airbag module is provided inside a seatback, wherein at least a part of a cover member for covering an airbag storage portion of the seatback is made of a seatback main fabric. The airbag module is provided with a case that accommodates the airbag and the inflator and is fixed to the frame side of the seat back, and the case is formed of the seatback main fabric and the side gusset fabric. It has a front opening which opens toward the suture portion. The present invention also includes that a front cover that opens when the airbag is deployed is provided in the front opening of the case.

In the airbag built-in sheet of the present invention, the airbag is inflated when the inflator is activated at the time of collision and gas is ejected from the gas ejection port of the inflator.
This airbag comes out forward from the front opening of the case, deploys toward the stitching portion of the cover member, and stably deploys in the normal direction while breaking the sewing thread of the stitching portion. Secondary collision with a vehicle interior member is reduced. The airbag referred to in this specification means a member that inflates in a bag shape by a gas such as nitrogen gas, and it goes without saying that the type of gas used for inflation is not limited.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2
The seat 20 with the built-in airbag shown in FIG.
And a seat back 22.

A seat back 22 shown in FIG. 1 has a seat back frame 23, a pad 24 made of, for example, urethane foam, and a cover member (a front seat trim cover) that covers the outside of the seat back frame 23 and the pad 24. 25 and the like.

The cover member 25 constituting the skin of the seat back 22 is made of a flexible material such as synthetic leather (the outer surface of a knitted knitted fabric as a backing fabric is coated with an elastomer), natural leather, or a fabric. Is cut into a predetermined shape and sewn.

A part of the cover member 25 which covers the side portion 22a of the seat back 22 functioning as an airbag storage portion is made of a seat back main fabric 25a as a first fabric.
And a side gusset material 25b as a second material are sewn together at a sewn portion 26 with a sewing thread 27. Seat back main fabric 25a is seat back 2
2 which is the cloth constituting the front side of
b is a cloth constituting the side surface of the seat back 22. Note that the cover member 25 that covers the side portion 22a may be a combination of the seaback main fabric 25a, the side gusset fabric 25b, and other fabrics.

A bracket 28 is fixed to the side of the seat back frame 23 by welding or the like. The bracket 28 has a mounting plate 28a shaped along the airbag module 30 described below.

An airbag module 30 is built in one side of the seat back 22, that is, a side portion 22a on the door side. The airbag module 30 includes a case 31 (shown in FIG. 3) fixed to the mounting plate 28 a of the bracket 28 of the seat back frame 23, an airbag 32 housed inside the case 31 in a folded state, An inflator 33 for generating an inflation gas such as a gas is provided.

As shown in FIG. 1, a bolt 36 is provided at a rear portion of the case 31. The bolt 36 is inserted through a hole formed in the mounting plate 28a, and a nut 37 is screwed into the bolt 36 and tightened. Case 31 is bracket 28
At a predetermined position. Further, as an ignition system of the inflator 33, a sensor for detecting a side collision of the vehicle, a power supply (not shown), and the like are connected.

The case 3 of the airbag module 30
A front opening 40 is formed at the front of the device 1. The front opening 40 is directed toward the seam 26 of the seat back main fabric 25a and the side gusset fabric 25b, and is open toward the seam 26. Portions of the case 31 other than the front opening 40, that is, the side walls 31a, 31b, the upper wall 31c, the bottom wall 31d, the rear wall 31e, etc. are connected to each other to form a box-shaped internal space. These walls 31a, 31b, 31
c and 31d also have a function of regulating the deployment direction of the airbag 32 so that the airbag 32 faces the front opening 40.

Next, the operation of the airbag-equipped seat 20 including the airbag module 30 will be described. When the vehicle receives a collision force from the side, the inflator 33 operates based on a signal output from a sensor that detects the collision, and an inflation gas such as nitrogen gas is ejected from a gas outlet of the inflator 33. The ejected gas is in case 31
While the ejection direction is regulated by this, it is ejected into the airbag 32.

When the airbag 32 begins to inflate due to the gas ejected from the inflator 33, the airbag 32
From the front opening 40 of the case 31 to the front of the case 31;
That is, it is deployed toward the vicinity of the suturing portion 26. In this case, since there is no member that opens on the side of the seat, such as the lid of the conventional airbag module (FIGS. 7 to 10), the side gusset cloth 25b can be prevented from being broken.
The deployment force of the airbag 32 is directly applied to the sewing thread 27 of the sewn portion 26.

As a result, the sewing thread 27 of the sewn portion 26 is surely broken, and the airbag 32 is deployed in the direction indicated by the arrow F as indicated by the two-dot chain line in FIG. FIG. 4 shows a state where the airbag 32 is deployed. The deployed airbag 32 is interposed in the space between the side of the body of the occupant sitting on the seat and the inner wall of the vehicle body, so that the secondary collision between the occupant and the inner wall of the vehicle body is reduced.

FIG. 5 shows another embodiment of the present invention, in which a front cover (lid) 50 is provided in a front opening 40 of a case 31. The case 31 is fixed to the bracket 28 of the seat back frame 23 as in the embodiment (FIG. 1). The front cover 50 is a bracket 2 of the front opening 40.
The hinge can be opened and closed around a hinge portion 51 provided on the edge near the edge 8. A catching portion 52 such as a claw provided on the case 31 is hooked on a receiving portion 53 such as a hole provided on the front cover 50, so that the case 31 can be kept closed.

As shown in FIG. 6, when the airbag 32 is deployed, the front cover 50 rotates around the hinge 51 toward the frame 23, and the front cover 50 is opened. The other configurations, functions and effects are the same as those of the above-described embodiment (FIGS. 1 to 4), and the common parts are denoted by the same reference numerals and description thereof will be omitted.

The airbag module 30 having such a front cover 50 (FIGS. 5 and 6) also has a structure in which when the airbag 32 is deployed, the airbag 32 comes out of the front opening 40 of the case 31 and the seam of the cover member 25 is joined. 26 (shown in FIG. 1). Also in this case, since there is no member (a member corresponding to the side gusset material 25b) that opens toward the sheet side, such as a conventional lid, the side gusset material 25b is not provided.
Can be avoided.

In the above-described embodiment, the case where the airbag module 30 is incorporated in the seat back 22 of the front passenger seat in a right-hand drive vehicle has been described. By incorporating the same airbag module 30 as in the embodiment, the same effects as described above can be obtained.

[0026]

According to the seat with a built-in airbag according to the present invention, there is no member such as a conventional lid facing the side of the seat when the airbag is deployed. It is possible to avoid that the cover member such as the cloth is torn and the airbag is deployed, and the airbag can exhibit the normal deployment performance.

According to the airbag module of the present invention, the front cover moves toward the frame of the seatback centering on the hinge portion when the airbag is deployed, so that the front cover touches a cover member such as side gusset cloth. Is avoided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a part of an airbag-containing seat according to an embodiment of the present invention.

FIG. 2 is a perspective view of the airbag built-in seat shown in FIG. 1;

FIG. 3 is a perspective view of an airbag module used for the airbag-containing seat shown in FIG.

FIG. 4 is a perspective view of the seat back in a state where the airbag of the airbag built-in seat shown in FIG. 1 is deployed.

FIG. 5 is a perspective view of an airbag module showing another embodiment of the present invention.

FIG. 6 is a perspective view showing a state in which the airbag of the airbag module shown in FIG. 5 is deployed.

FIG. 7 is a cross-sectional view of a part of a conventional airbag built-in seat.

FIG. 8 is a perspective view of an airbag module used in the conventional airbag built-in seat shown in FIG.

FIG. 9 is a perspective view showing a state in which the airbag of the conventional airbag module shown in FIG. 8 is deployed.

FIG. 10 is a side view of the conventional airbag module shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Airbag built-in seat 22 ... Seat back 22a ... Side part (airbag storage part) 25 ... Cover member 25a ... Seat back main cloth 25b ... Side gusset cloth 26 ... Seam part 30 ... Airbag module 31 ... Case 32 ... Airbag 33 ... inflator 40 ... front opening 50 ... front lid

Continued on the front page (72) Inventor Haruji Takasawa 5th, Osakuda, Ojima-cho, Nitta-gun, Gunma Prefecture F-term in Nihon Hatsujo Co., Ltd. 3B087 CD04 DB02 DE03 3D054 AA02 AA03 AA07 AA21 CC26 CC47 EE20

Claims (2)

[Claims] An airbag with a built-in airbag module inside a seatback, wherein at least a part of a cover member for covering an airbag storage portion of the seatback is formed by sewing a seatback main fabric and a side gusset fabric. The airbag module includes a case that accommodates the airbag and the inflator and is fixed to a frame side of a seat back, and the case has a front surface that opens to a seam portion side of the seat back main fabric and a side gusset fabric. An airbag built-in seat having an opening. 2. A front cover, which is opened at the time of deployment of an airbag, is provided at a front opening of the case, and the front cover is opened to the frame side by a hinge provided at a position close to the frame. The airbag-equipped seat according to claim 1, wherein: