JP2000038104A - Seat with built-in air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat with a built-in air bag that breaks along a preselected place when the air bag is inflated and offers the regular inflation performance thereof. SOLUTION: This air bag-built-in seat 20 has an air bag module 30 set in a side part 22a of a seat back 22. A cover member 25 that covers the side part 22a is made of main seat back cloth 25a and side gore cloth 25b both cut into a prescribed shape and sewn together along a seam 40, which breaks for air bag inflation. Both the cloths 25a and 25b have at their proximal edges along the seam 40 marks or projections 50 for positioning use in the sewing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag built-in seat having an airbag module built in a seat back.

[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.

A vehicle seat provided with a side airbag device has a built-in inflator in a side portion of a seat back on a door side, and activates the inflator according to a signal output from a sensor at the time of a side collision of the vehicle, thereby generating gas generated by the inflator. Inflates the airbag.
The seat back includes a frame, a pad, a cover member, and the like.When the airbag is deployed, pressure applied from the inside of the cover member breaks a sewing thread at a sewn portion between the seat back main fabric and the side gusset fabric. The airbag inflates from the front of the seat back to expand to a shape that can protect the side head and the like from the side of the occupant's body.

For example, a conventional side gusset cloth 1 shown in FIG.
Is obtained by cutting a woven or knitted fabric such as synthetic leather, natural leather, or fabric into a predetermined shape, and is sewn to a seat back main fabric (not shown). Marks 2 used as positioning means at the time of sewing are provided on the peripheral edge of the side gusset cloth 1 and the peripheral edge of the cloth to be sewn. The mark 2 is also referred to as a "hit".
The conventional mark portion 2 has a V-shaped notch, that is, a concave shape.

[0005]

When the mark portion 2 has a concave shape as in the above-mentioned seat back fabric 1, when the built-in airbag 3 is deployed forward (in the direction indicated by the arrow F), the air is released. It is conceivable that breakage may occur at the sewn portion affected by the deployment of the bag, starting from the mark portion 2 as shown by the one-dot chain line C in FIG. 6, for example. When the fabric itself breaks in this way, force is less likely to be applied to a regular breakable portion, that is, a thread or the like that sewes the side gusset fabric 1 and the seat back main fabric. In this case, it is conceivable that the airbag is deployed while the portion other than the sewn portion, for example, the side gusset material 1 is torn, which may hinder the deployment performance of the airbag.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an airbag-equipped seat in which a predetermined portion is reliably broken when an airbag incorporated in a seatback is inflated to obtain a proper inflation performance. .

[0007]

According to the present invention, there is provided an airbag with a built-in airbag provided with an inflator inside the seatback, wherein a cover member for covering the seatback is formed by sewing a plurality of cut fabrics together. A mark portion used for positioning the fabric at the time of sewing is provided at a peripheral portion of the fabric of the cover member that covers at least the airbag storage portion, and the mark portion has a convex shape. is there.

In the airbag with a built-in airbag according to the present invention, the inflator operates when a collision force is applied, and the gas is blown out to inflate the airbag and the pressure acts from inside the cover member. Here, the mark for positioning of the sewn portion of the cloth constituting the cover member has a convex shape instead of the conventional concave shape, so that the mark does not become a starting point of breakage when the airbag is deployed, and the airbag is Since the force at the time of deployment acts on a predetermined sewn portion and breaks the sewing thread or the like, breakage of the cloth itself such as the side gusset cloth is suppressed.

Therefore, the airbag is stably deployed in the normal direction, and the secondary collision between the occupant and the 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 gas used for inflation is not limited to air.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The seat 20 with a built-in side airbag shown in FIG. 3 is applied to a front seat of an automobile, and includes a seat cushion 21 and a seat back 22. The seat back 22 includes a seat back frame 23 as shown in FIG.
A pad 24 made of, for example, urethane foam, and a cover member (front seat trim cover) that covers the outside of the seat back frame 23, the pad 24, and the like.
25 and the like. A bracket 28 is fixed to a side portion of the seat back frame 23 by welding or the like.

An airbag module 30 that constitutes a side airbag device 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 fixed to the bracket 28 of the seat back frame 23, an airbag 32 housed inside the case 31 in a folded state, and an inflating gas such as nitrogen gas. Inflator 3
3 and the like. The case 31 also functions as a guide member that regulates the direction in which the inflation gas is ejected. In addition, 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 cover member 25 is formed by cutting a cloth such as a synthetic leather (the outer surface of a knitted knitted fabric serving as a backing base cloth with an elastomer or the like), a natural leather, or a fabric into a predetermined shape and sewing. ing. The cover member 25 that covers the side portion 22a functioning as the airbag storage portion includes a sewing thread 41 that sew the seatback main fabric 25a and the side gusset fabric 25b at the sewn portion 40.
Are stitched together. Side gusset dough 25
“b” is a cloth constituting the side surface of the seat back 22.

The cover member 25 of this embodiment is provided with a side gusset material 25b as shown in FIG. 1 for positioning when sewing the seat back main material 25a and the side gusset material 25b at the time of sewing these materials. As a representative example, a convex mark portion (hit) 50 is provided. These mark portions 50 are provided at positions where both the seat back main fabric 25a and the side gusset fabric 25b match each other. An example of the shape of the mark portion 50 is, for example, a substantially isosceles triangle as shown in FIG. An example of the size of the mark portion 50 is a height H = 4 mm and a width W = 5 mm.
It is. And at the time of sewing, the mark portions 5 of the fabrics 25a and 25b
The fabrics 25a and 25b are sewn together with the sewing thread 41 at the sewn portion 40 while adjusting the positions of the cloths 25 with 0 as a mark.

The mark portion 50 is employed in the sewn portion 40 which is affected by at least the deployment of the airbag 32. The other sewn portions may be concave mark portions (the same shape as the mark portion 2 shown in FIG. 6) similar to those of the related art, or a convex mark portion 50 may be used.

Next, the side airbag built-in seat 2
The operation of 0 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 the inflator 33. The gas that erupted
The gas is ejected into the airbag 32 while the ejection direction is regulated by the case 31.

When the inflator 33 begins to inflate the airbag 32 due to the gas ejected from the inflator 33, the airbag 32 expands forward of the case 31, and the pressure is applied from the back side of the cover member 25 to the seatback main fabric 25 a and the side gusset fabric 25 b. On the suturing part 40. As described above, the cover member 25 is provided with the convex mark portion 50.
Is used, when the airbag 32 is to be deployed, the fabrics 25a, 25b
It is avoided that the position of the mark portion 50 of 5b becomes the starting point of the breaking, and the force for breaking the sewing thread 41 of the stitching portion 40 is directly applied to the sewing thread 41.

As a result, the sewing thread 41 of the sewn portion 40 is reliably broken, so that the airbag 32 is deployed forward of the seat back 22 (in the direction indicated by arrow F) from the sewn portion 40 as shown in FIG. . 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.

In embodying the present invention, a convex mark portion 50 similar to that of the above-described embodiment may be employed in a sewn portion other than the seat back main material 25a and the side gusset material 25b. In short, according to the present invention, the intended object of the present invention can be achieved by applying the convex mark portion to the sewn portion where the deployment of the airbag is affected. It goes without saying that the location and number of the mark portions 50 or the specific shape of the mark portions 50 can be variously modified without departing from the gist of the present invention without being limited by the embodiment. A cover member 2 that covers the side portion 22a as an airbag storage portion
5 may be a combination of the seat back main fabric 25a, the side gusset fabric 25b, and other fabrics.

[0019]

According to the airbag with a built-in airbag of the present invention, when the airbag is deployed, it is possible to avoid the breakage of the cloth starting from the mark of the sewn portion of the cloth constituting the cover member. Since the force at the time of deployment can be applied to a predetermined location and the predetermined location can be reliably broken, the deployment direction of the airbag is stabilized, and regular deployment performance can be exhibited.

[Brief description of the drawings]

FIG. 1 is a plan view of a fabric used for a cover member of an airbag-containing sheet according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a part of the fabric shown in FIG. 1;

FIG. 3 is a perspective view of an airbag built-in sheet using the fabric shown in FIG. 1;

FIG. 4 is a cross-sectional view of a part of the airbag built-in seat shown in FIG. 3;

5 is a perspective view of the seat with a built-in airbag shown in FIG. 3 when the airbag is deployed.

FIG. 6 is a plan view of a fabric for a cover member of a conventional airbag built-in sheet.

[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 30 ... Airbag module 32 ... Airbag 40 ... Stitching part 50 ... Mark Department

Claims (1)

[Claims] 1. An airbag with a built-in airbag provided with an airbag deployed by an inflator inside a seatback, wherein a cover member covering the seatback is formed by sewing a plurality of cut fabrics, and at least an airbag storage portion. An airbag-equipped sheet, characterized in that a mark portion used for positioning the cloth material at the time of sewing is provided on a peripheral edge portion of the cloth material of the cover member to be sewn, and the mark part is formed in a convex shape.