JPH09132105A - Airbag device for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain appropriate airbag cushioning without forming a discharge hole by forming inner cloth on the occupant side of an airbag out of impermeable coated cloth, and outer cloth on the non occupant side out of permeable uncoated cloth. SOLUTION: This airbag 9 has an integral shape consisting of a general part 10 for protecting an occupant's torso and an upward extension 11 for protecting an occupant's head. This airbag 9 is formed into a bag shape by weaving the inner cloth 12 on the occupant side and the outer cloth 13 on the vehicle body side wall side (non-occupant side) with each other. The inner cloth 12 is formed out of coated cloth provided with rubber coating. The outer cloth 13 is formed out of uncoated cloth not provided with rubber coating. As a result, the inner cloth 12 will not permit gas injected from a gas generator 5 to pass through. On the other hand, the outer cloth 13 permits a part of gas to pass through to the outside. It is thus possible to provide appropriate cushioning for the airbag 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can protect an occupant by relaxing an impact load received from a side wall of a vehicle body or the like by deploying an airbag provided on a seat back in the case of a side collision of a vehicle. The airbag device is a vehicle seat.

[0002]

2. Description of the Related Art Conventionally, in order to avoid an impact at the time of a side collision of a vehicle, an airbag device for a vehicle seat as shown in FIGS. 6 and 7 has been used (as a similar technique,
(See Japanese Patent Laid-Open No. 4-50052).

A seat 1 on the right side of the front is composed of a seat cushion 2 and a seat back 3. An airbag 4 and a gas generator 5 are built in a side portion of the seat back 3 on a side wall (door etc.) side of the vehicle body. Airbag 4
Has a bag shape in which an inner cloth 6 on the occupant side and an outer cloth 7 on the side wall of the vehicle body are sewn, and is folded into a bellows shape and stored inside the seat back 3 when not in use. Both the inner cloth 6 and the outer cloth 7 of the airbag 4 are formed of a coating cloth having a rubber coating through which the gas G does not pass, and the outer cloth 7 is provided with four discharge holes 8.

At the time of a side collision of the vehicle, gas G is ejected from the gas generator 5 into the airbag 4, and the gas pressure causes the airbag 4 to smash the skin of the seat back 3 and bulge forward. The airbag 4 thus taken out prevents the occupant from directly colliding with the side wall of the vehicle body and can protect the occupant. Moreover, since an appropriate amount of gas G escapes from the exhaust hole 8 when the airbag 4 is inflated, an appropriate cushioning property of the airbag 4 can be obtained and the occupant can be reliably protected.

[0005]

However, in such a conventional airbag device for a seat, the exhaust hole 8 is formed in the outer cloth 7 in order to obtain an appropriate cushioning property of the inflated airbag 4. Airbag 4 because it needs to
Is difficult to manufacture.

The present invention has been made in view of such a conventional problem, and provides an airbag device for a vehicle seat which can obtain a proper cushioning property of an airbag without providing a discharge hole. It is a thing.

[0007]

According to the first aspect of the present invention,
The inner cloth on the occupant side of the airbag is formed of a non-breathable coated cloth, and the outer cloth on the opposite side of the occupant is formed of a breathable uncoated cloth.

According to the first aspect of the present invention, since the portion on the side opposite to the occupant of the airbag is formed of an uncoated cloth which can be ventilated, the uncoated cloth can be formed from this uncoated cloth without providing a discharge hole. A proper amount of gas is discharged, and a proper cushioning property of the inflated airbag can be obtained.

According to a second aspect of the invention, the airbag has a shape in which a general portion for protecting the trunk portion is integrally formed with an upward extension portion for protecting the head portion.

According to the second aspect of the present invention, since the airbag has a shape in which an upper extension portion for protecting the head portion of the general portion for protecting the trunk portion is formed, the airbag is inflated,
Both the torso and head can be protected.

According to the third aspect of the invention, the airbag is folded in a bellows shape with the upper extension portion folded into the general portion.

According to the third aspect of the present invention, since the upper extension portion is folded in the general portion, the airbag has a complicated shape with the upper extension portion, but the airbag has a bellows shape. Easy to fold.

[0013]

1 to 5 are views showing an embodiment of the present invention. In addition, the same reference numerals are given to portions common to the related art, and overlapping description will be omitted.

The airbag 9 according to this embodiment has a general shape having a general portion 10 for protecting the torso of the occupant and an upward extension 11 for protecting the occupant's head. Further, the airbag 9 is formed by sewing an inner cloth 12 on the occupant side and an outer cloth 13 on the vehicle body side wall side (anti-occupant side) to each other to form a bag shape. The inner cloth 12 is formed of a rubber-coated coating cloth, and the outer cloth 13
Is made of uncoated cloth without rubber coating. Therefore, the inner cloth 12 does not pass the gas G ejected from the gas generator 5, but the outer cloth 13 allows a part of the gas G to pass to the outside.

The airbag 9 has the outer cloth 13 as described above.
Is made of a material that allows the gas G to pass therethrough, so that it is not necessary to provide a “discharge hole” as in the conventional case, and the manufacture of the airbag 9 is easy. In addition, half of the airbag 9 (outer cloth 1
Airbag 9 because 3) is made of lightweight uncoated cloth
It is possible to reduce the overall weight of the. Furthermore, outer cloth 1
Since 3 is made of a flexible uncoated cloth, the overall flexibility of the airbag 9 is also improved, and the airbag 9 can be folded more compactly.

To fold the airbag 9 when not in use, as shown in FIGS. 4 and 5, first, the upper extension portion 11 is folded into the general portion 10. By doing so, the airbag 9 has the rectangular shape of only the general portion 10 as in the conventional case, and can be easily folded into a bellows shape thereafter (see FIG. 3). Then, the airbag 9 folded into a bellows shape is housed in the side portion of the seat back 3 together with the gas generator 5.

At the time of a side collision of the vehicle, gas is ejected from the gas generator 5 into the airbag 9, and the gas pressure causes the airbag 9 to smash the skin of the seat bag 3 and bulge forward. Since the airbag 9 of this embodiment has the above-described shape, the general portion 10 can protect the torso of the occupant and the upward extension 11 can also protect the occupant's head. Furthermore, since the outer cloth 13 of the airbag 9 is formed of an uncoated cloth, an appropriate amount of gas G is discharged from the outer cloth 13, and the cushioning property of the airbag 9 is obtained appropriately.

In the above embodiment, the seat back 3 is used.
As an example of the "anti-occupant side", an example in which the airbag 9 is housed in the side portion on the side wall side of the vehicle body is shown. However, depending on the type of airbag device, the airbag 9 is provided on both side portions of the seat back 3. There is also a structure (for example, see Japanese Utility Model Laid-Open No. 3-108564). In the case of the airbag 9 on the vehicle interior side of such a device, the other adjacent seat side is the "anti-occupant side".
Becomes

[0019]

According to the first aspect of the present invention, since the portion on the side opposite to the occupant of the airbag is formed of an uncoated cloth capable of ventilating, the uncoated cloth does not need to be provided with a special discharge hole. A proper amount of gas is discharged from the air bag, and a proper cushioning property of the inflated airbag can be obtained.

According to the second aspect of the invention, since the airbag has a shape in which the upper portion for protecting the head is formed in the general portion for protecting the trunk portion, the bulging airbag causes Both heads can be protected.

According to the third aspect of the present invention, since the upper extension is folded into the general portion, the airbag has a complicated shape with the upper extension, but the airbag is folded in a bellows shape. easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an airbag device for a vehicle seat according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the airbag taken along the line SA-SA shown by the arrow in FIG.

FIG. 3 is a perspective view showing a state in which the airbag is folded into a bellows shape.

FIG. 4 is a side view of the airbag showing a state in which an upper extension portion is folded into a general portion.

5 is a cross-sectional view of the airbag taken along the line SB-SB shown in FIG.

FIG. 6 is a perspective view showing a conventional seat.

FIG. 7 is a sectional view taken along the line SC-SC shown in FIG. 6;

[Explanation of symbols]

 3 Seat back 9 Airbag 10 General part 11 Upward extension part 12 Inner cloth (coated cloth) 13 Outer cloth (uncoated cloth) G Gas

Claims (3)

[Claims] 1. A vehicle seat for protecting an occupant by folding and storing an airbag on a side portion of a seat back and ejecting gas into the airbag at the time of a vehicle collision to inflate the airbag forward to protect an occupant. In the airbag device, a passenger seat of the airbag is formed of a non-breathable coated cloth, and an anti-occupant side outer cloth is formed of a breathable uncoated cloth. Airbag device. 2. An airbag is provided in a general portion for protecting a trunk,
2. The airbag device for a vehicle seat according to claim 1, which has a shape in which an upper extension portion for protecting the head portion is integrally formed. 3. The airbag device for a vehicle seat according to claim 2, wherein the airbag is folded in a bellows shape with the upward extension portion folded into the general portion.