JPH0832510B2 - Airbag device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an airbag device for protecting an occupant in the event of a collision of a vehicle or the like, and more specifically, an airbag body having a gas inlet, A gas generator connected to the gas injection port side, the gas generator fixed to a base plate fixed to the fixed side, and a peripheral edge of the gas injection port at a peripheral portion of a through hole formed in the base plate. The present invention relates to an airbag device in which a portion is attached via a retainer.

[Conventional technology]

BACKGROUND ART Conventionally, an airbag device has been known as a protection device for passengers of a vehicle or the like. As this air bag device, there is Japanese Patent Publication No. 56-43890, and as the holding structure of the air bag body, there are No. 61-85549 and 61.
-185642 publication exists.

In such an airbag device, as shown in FIGS. 8 and 9, the gas generator 2 is fixed to the base plate 1 mounted on the fixed side of the instrument panel, the steering wheel or the like, and the air bag having the gas inlet 4 is provided. When the bag body 3 is fixed by the bolt 6 and the nut 7 via the retainer 5 and is fixed between the retainer 5 and the base plate 1 by the blind rivet 8 and the gas generator operates under a predetermined condition. Gas instantaneously flows into the airbag main body 3 and the airbag main body 3 is instantly inflated.

[Problems to be Solved by the Invention]

However, when the airbag body 3 is inflated, that is, when the gas generator 2 is actuated, an impact force is applied to the mounting portion of the gas inlet port 4 of the airbag body 3, so that a gas leak will occur.
There was a risk of damage to the product. Therefore, various methods have been adopted to strengthen the peripheral portion of the gas injection port.
For example, the attachment portion is formed by stacking a plurality of cloths, the gas injection port is formed thicker than other portions, or the sewing portion is formed by chain stitching or the like.

In such a conventional attachment structure of the airbag body 3, the cloth has to be formed thick, or a plurality of cloths are used, which has a drawback of increasing the cost, and the chain stitch has a sufficient thickness. It had a defect that it could not be formed.

An object of the present invention is to firmly attach an airbag main body without performing work such as stacking a plurality of fabrics, and reduce the number of parts without fear of the airbag main body falling off or being damaged. It is possible to provide an airbag device that can be manufactured and is extremely economical.

[Means for solving the problem]

The present invention has been made in view of the problems described above, and includes an airbag body having a gas inlet, and a gas generator connected to the gas inlet side, and the gas generator is fixed to the fixed side. In the airbag device fixed to the base plate, the peripheral portion of the gas inlet is attached to the peripheral portion of the through hole formed in the base plate via a retainer, the peripheral portion of the gas inlet of the airbag body is A reinforcing cloth is attached, and an inner peripheral edge of the gas inlet of the reinforcing cloth and a peripheral edge portion of the gas inlet of the airbag body extend inside the inner peripheral edge of the retainer. It is characterized in that the periphery of the gas inlet of the airbag body is sewn over the entire circumference by overlock stitching.

[Action]

According to the present invention, since the inner peripheral edge of the reinforcing cloth and the peripheral edge of the gas inlet of the airbag body are sewn over the entire circumference by overlock stitching, the thickness of the sewn portion is significantly increased, and Since the sewn portion is located inside the inner peripheral edge of the retainer, the peripheral edge portion of the gas inlet of the airbag body is firmly sandwiched between the retainer and the gas generator.

[Embodiment] An airbag device according to the present invention will be described in detail below with reference to the drawings.

1 and 2 respectively show the outline of one embodiment of the airbag device according to the present invention.
The fixed side to which the base plate 13 is attached can be the steering side or the instrument panel side.

The airbag device 11 includes a gas generator 17 fixed to a base plate 13 by fixing means 15 such as bolts and nuts, and an airbag body 19 having a gas inlet 21 into which gas from the gas generator 17 flows. ing. The number of gas generators 17 may be one, or a plurality of gas generators 17 may be provided in a pair on the left and right. When using a plurality of gas generators 17, a plurality of gas inlets 21 may be formed.

The airbag body 19 is formed by laminating a synthetic resin sheet on a cloth or the like. A reinforcing cloth 23 as a belt catch is sewn on the inside of the peripheral portion of the gas inlet 21 of the airbag body 19. A hanging belt is attached to the airbag body 19 although illustration is omitted in the figure, and the hanging belt does not hit the chest or face of the seated person when the central portion of the airbag body 19 bulges forward. As described above, the bulging of the airbag body 19 is restricted. The ends of the hanging belt are sewn to the reinforcing cloth 23 as the belt catch. As will be described later, the reinforcing cloth 23 and the belt catch may be separately formed, or the reinforcing cloth 23 may not be provided with a hanging belt.

A through hole 25 is formed in the substantially central portion of the base plate 13,
The front end side of the gas generator 17 projects forward from the through hole 25, and the gas ejection port 17a of the gas generator 17 is inserted into the airbag body 19 through the gas injection port 21. The peripheral portion of the gas inlet 21 is fixed to the base plate 13 together with the reinforcing cloth 23 via a retainer 14.

A gas inlet 24 is formed in the reinforcing cloth 23 in the same shape as the gas inlet 21 of the airbag body 19, and the inner peripheral edge of the gas inlet 24 of the reinforcing cloth 23 and the gas inlet 21 of the airbag body 19 are formed.
Overlocking thread made of nylon thread etc. around the entire circumference
It is sewn by overlock stitching 29 by 27. The overlock stitch 29 is performed by edging, and the higher the sew density of the edging, the more preferable. The diameter of the overedging thread 27 used for the overedging 29 is preferably 0.5 mm to 1 mm.

As shown in FIG. 3, the inner peripheral edge of the gas inlet port 24 of the reinforcing cloth 23 and the peripheral edge portion of the gas inlet port 21 of the airbag body 19 are pre-inverted, and overlock stitch 29 is performed with the overlocking thread 27.
Then, this can be reversed again, and the overlock stitch 29 can be formed inside the reinforcing cloth 23 and the airbag body 19. Reference numerals 31 and 32 are normal sewing parts, and reference numeral 34 is a mounting hole.

Modified examples of the present invention are shown in FIGS. 4 to 7, respectively. In the embodiment shown in FIGS. 4 and 5, the reinforcing cloth 23 is used.
The O-ring 36 made of a synthetic resin material or metal is inserted during the oversewing 29 between the inner peripheral edge of the gas inlet 24 and the peripheral edge of the gas inlet 21 of the airbag body 19. By inserting the O-ring 36, the thickness of the overedging 29 is further increased and the strength is also increased.

In the embodiment shown in FIG. 6, the O-ring 36 is inserted into the overlock stitch 29 shown in FIG.

Further, in the embodiment shown in FIG. 7, the two catch cloths 38, which are formed separately from the reinforcing cloth 23, are over stitched 29 together with the peripheral portion of the gas inlet 21 of the airbag body 19. A hanging belt 40 is attached to these two catch cloths 38.
One end of is sewn.

The overedging 29 in the above-described embodiment is formed inside the inner peripheral edge of the retainer 14, as is clear from FIGS. 1 and 3. That is, the inner peripheral edge of the reinforcing cloth 23 and the peripheral edge portion of the gas inlet 21 of the airbag body 19 are extended inward from the inner peripheral edge of the retainer 14.

〔The invention's effect〕

The above is the configuration of one embodiment of the airbag device according to the present invention. According to such a configuration, the inner peripheral edge of the reinforcing cloth and the peripheral edge portion of the gas injection port of the airbag main body overhang over the front periphery. Since it is sewn by sewing, the thickness of the sewn portion is significantly increased, and since this sewn portion is located inside the inner peripheral edge of the retainer, the peripheral portion of the gas injection port of the airbag body is It can be firmly sandwiched between the retainer and the gas generator, there is no risk that the airbag body will fall out or be damaged, the number of parts can be reduced and work efficiency can be improved, and it is extremely economical. It is possible to obtain an air bag device.

[Brief description of drawings]

1 to 7 respectively show an outline of an embodiment of an airbag device according to the present invention. FIG. 1 is a partial sectional view, FIG. 2 is a rear view of an airbag body, and FIG. Sectional views showing modified examples of overlock stitching, FIGS. 4 and 5 are sectional views and rear views showing a state in which an O-ring is inserted in the embodiment shown in FIGS. 1 and 2, respectively, and FIG. Is O in the embodiment shown in FIG.
-A sectional view showing a state in which a ring is inserted, Fig. 7 is a sectional view in a state in which a belt catch is separately formed, Figs. 8 and 9
FIG. 1 is an exploded perspective view and a sectional view of a conventional airbag device. In the figure, 11 ... Airbag device, 13 ... Base plate,
14 …… Retainer, 15 …… Fixing means, 17 …… Gas generator,
17a ... Gas outlet, 19 ... Airbag body, 21 ... Airbag body gas inlet, 23 ... Reinforcing cloth, 24 ... Reinforcing cloth gas inlet, 25 ... Through hole, 27 ... Overlocking thread, 29 ……
Overlock stitching, 31,32 …… Sewing part, 36 …… O-ring, 38
…… Catch cloth, 40 …… Suspension belt.

Claims (1)

[Claims] 1. An airbag main body having a gas injection port, and a gas generator connected to the gas injection port side, the gas generator being fixed to a base plate fixed to the fixed side, and being attached to the base plate. In an airbag device in which the peripheral portion of the gas inlet is attached to the peripheral portion of the formed through hole via a retainer, a reinforcing cloth is attached to the peripheral portion of the gas inlet of the airbag body, and the reinforcing cloth The inner peripheral edge of the gas inlet and the peripheral portion of the gas inlet of the airbag body are extended inward from the inner peripheral edge of the retainer, and the inner peripheral edge of the reinforcing cloth and the peripheral edge of the gas inlet of the airbag body. An airbag device, wherein the portion and the portion are sewn over the entire circumference by overlock stitching.