JPH072037A - Air bag body of air bag device and manufacture thereof - Google Patents

Abstract

PURPOSE:To speedily form a slip-off preventing projection at least on a reinforcing cloth in a simple manner by superposing a plurality of reinforcing cloth on a base cloth in an installation part, without utilizing seaming, and to improve the close adhesiveness between the installation part of an air bag body and a base plate, suppressing the contact of the slip-off preventing projection with the base plate and to improve the operation reliability. CONSTITUTION:An air bag body 11 having a gas injection port 15 is fixed on a base plate through a retainer. The air bag body 11 is formed by seaming the edges of a plurality of base cloth. The installation part 13 of the air bag body 11 is formed by superposing the reinforcing cloth 17a, 17b, and 17c on the base cloth. A slip-off preventing projection 19 is formed at least on the reinforcing cloth 17c at the position corresponding to the inside part of the retainer at the installation part 13 by the heating means such as ultrasonic cutter, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag body of an airbag device for protecting an occupant in the event of a collision of a vehicle and a method for manufacturing the same, and more specifically, it has a gas inlet and a base plate. The present invention relates to an airbag main body of an airbag device which is fixed via a retainer and is configured to be inflated by injecting gas from a gas inlet when a gas generator is operated, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, an airbag device has been known as a device for protecting an occupant such as a vehicle. As this air bag device, Japanese Patent Publication No. 56-43890, JP-A 2-2
Japanese Patent Laid-Open No. 54-69543 and the like exist as a holding structure for the airbag body. Further, Japanese Utility Model Laid-Open No. 61-85549 exists as a device for covering and protecting the stitched portion of the airbag body.

As an air bag device, a gas generator is fixed to a base plate mounted on the fixed side of an instrument panel or a steering wheel, and an air bag body having a gas injection port is fixed to the base plate via a retainer, so that a shock or the like occurs. When the gas generator operates under the predetermined conditions of, gas momentarily flows into the airbag body,
The airbag body is designed to be swollen instantly.

As shown in FIGS. 5 and 6, the airbag body 1 of the airbag device is formed by sewing the edges of the base cloth forming the main portion 1a and the side portion 1b, and is attached to the base plate 2. The mounting portion 3 is formed on the side of the portion 1a, and the gas injection port 5 is formed in the mounting portion 3. The edge of the base cloth of the mounting portion 3 of the main portion 1a is polymerized or formed of only one base cloth.

A plurality of reinforcing cloths 7a, 7b, 7c are sewn to the base cloth of the mounting portion 3 of the main portion 1a. The reinforcing cloths 7a and 7b are made of patch cloth, and the reinforcing cloth 7c
Is formed of a heat patch or the like. A plurality of retainer mounting holes 6 are formed along the outside of the gas injection port 5 formed in the mounting portion 3. Further, inside the retainer mounting hole 6, a sewing preventing sewing 9 for preventing the airbag body 1 from falling off from the retainer 8 is formed to project. In FIG. 5, reference numeral 10 is a bolt of the retainer 8.

[0006]

However, it is difficult to form the sewn-out preventing stitch 9 so as to project, and the work is complicated, and the retainer 8 is prevented from coming off due to variations in sewing. There is a risk of riding on the sewing 9 for use, and the sewing 9 for preventing slippage comes into contact with the base plate 2 so that the adhesion between the mounting portion 3 of the airbag body 1 and the base plate 2 is poor and the operation reliability is poor. Met.

Further, the plurality of retainer mounting holes 6 are formed after the sewing work for accuracy, and the plurality of retainer mounting holes 6 are used as positioning holes to form the gas injection port 5. Since the retainer mounting hole 6 is formed to be large, there is a risk that the gas injection port 5 may be displaced at the drilled position.

An object of the present invention is that it is not necessary to join a plurality of reinforcing cloths to the base cloth of the mounting portion by sewing, and projections for preventing slipping out can be formed easily and quickly, and also for preventing slipping out on the base plate. The present invention provides an airbag main body of an airbag apparatus and a method for manufacturing the same, in which the protrusions of the airbag do not come into contact with each other, the adhesion between the mounting portion of the airbag main body and the base plate is excellent, and the operation reliability can be improved. .

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an airbag body of an airbag apparatus according to claim 1 has a gas inlet and a base plate via a retainer. In an airbag body of an airbag device which is fixed and is configured to inflate gas from a gas inlet when the gas generator is activated, the airbag body is formed by sewing edges of a plurality of base cloths. And a mounting portion to be attached to the base plate is formed by superposing a reinforcing cloth on a base cloth, and a protrusion for preventing slippage is formed at least at a position corresponding to an inner portion of the retainer of the mounting portion. It is characterized by

According to a second aspect of the present invention, in the method of manufacturing an airbag body of an airbag apparatus, the airbag body is fixed to the base plate via a retainer, and gas is injected from a gas injection port and swells when the gas generator is activated. In the method for manufacturing the airbag body of the airbag device, the reinforcing cloth is superposed on the mounting portion of the base cloth attached to the base plate, and the base cloth and the reinforcing cloth of the mounting portion of the inner portion of the retainer are injected with gas. It is characterized in that an inlet is formed, and a protrusion for preventing coming out is formed by heating means on at least the reinforcing cloth on the outer side of the gas inlet and on the inner side of the retainer.

[0011]

According to the airbag body of the airbag device of the first aspect of the present invention, the attachment portion attached to the base plate of the airbag body formed by sewing the edges of the plurality of base fabrics is the base fabric. Formed by superimposing a reinforcing cloth on at least a position corresponding to the inside of the retainer of the mounting portion, and a protrusion for preventing slippage is formed on at least the reinforcing cloth, and the protrusion for preventing slippage is formed by ultrasonic heating or high frequency heating. Formed from the reinforcing cloth itself by press molding etc., it is possible to easily and quickly form protrusions for preventing slipping out, and the sewn part does not protrude to the base plate side, and the adhesion between the mounting part of the airbag body and the base plate is improved. The friction resistance can be increased, and the strength can be improved.

Further, according to the method of manufacturing the airbag body of the airbag device according to the second aspect of the present invention, the protrusion for preventing slippage is formed on at least the reinforcing cloth outside the gas inlet and inside the retainer. Since it is formed by heating means such as sonic heat molding or high frequency heat press molding, it is possible to easily and quickly form the protrusions for preventing slipping out, reduce the number of work steps, and make the sewing part protrude to the base plate side. In addition, the adhesion between the mounting portion of the airbag body and the base plate can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An airbag body of an airbag device according to the present invention and a method of manufacturing the same will be described below in detail with reference to the drawings. 1 to 4 each show an outline of one embodiment of the present invention, the airbag body 11 is not limited to the airbag device for the passenger seat on the instrument panel side in this embodiment, and the side The present invention can also be applied to the airbag device for the driver's seat or the rear seat on the door side or the steering side.

As shown in FIG. 4, the airbag body 11 is formed by sewing a plurality of base fabrics, as shown in FIGS. 5 and 6, and a main portion 11a forming a central portion and an example of this main portion are formed. 11a formed on both sides of the main portion 11a
It also has a side portion 11b forming a bag-shaped portion.

The mounting portion 13 is formed by superposing reinforcing cloths 17a, 17b and 17c on the base cloth of the main portion 11a. The attachment portions 13 may be formed by extending the ends of the base fabrics of the main portions 11a facing each other and overlapping the ends, and the reinforcing fabric is not limited to that shown in the drawings.

A gas inlet 15 is formed in the mounting portion 13 of the airbag body 11, and the outer peripheral edge of the gas inlet 15 is fixed to the gas outlet side of the gas generator or the base plate (not shown). Mounted.

A plurality of retainer mounting holes 16 are formed along the outer peripheral edge of the gas inlet 15, and a plurality of retaining holes 16 are provided along the outer peripheral edge of the gas inlet 15 inside the plurality of retainer mounting holes 16. The protrusion 19 of the airbag body 11
Is formed so as to project inward.

The plurality of protrusions 19 for preventing detachment are formed from the reinforcing cloth itself by ultrasonic heat molding or high frequency heat press molding. In this embodiment, the base cloth of the main portion 11a constituting the mounting portion 13 and the reinforcing cloth are reinforced. Cloth 17a, 17b, 17c
However, at least the innermost reinforcing cloth 17 is integrally formed in the overlapping state of the retainer 17 at a position corresponding to the inner portion of the retainer.
What is necessary is that the protrusion 19 for preventing coming off is formed on c. In this case, the base cloth and the reinforcing cloth 17 of the main portion 11a
The outer peripheral edges of a, 17b, and 17c may be heat fused.

Since the protrusions 19 for preventing disengagement are formed so as to project inward from the reinforcing cloth itself by ultrasonic heating molding or high-frequency heating press molding, the sewing portion does not project to the base plate side, and the airbag body The adhesion between the mounting portion 13 of 11 and the base plate can be improved, and the frictional resistance can be increased.

Next, a method of manufacturing the airbag body of the airbag device of the present invention will be described in detail with reference to FIGS. The ultrasonic cutter 21 used in the method of the present invention includes a receiving jig 22 and an upper die 23. This receiving jig 2
Ultrasonic vibration is applied to the airbag body 11 inserted between the upper mold 23 and the upper mold 23, and frictional heat is applied.

The receiving jig 22 is, as shown in FIG.
5 has a cutting jig 27 planted at the center side thereof, and this cutting jig 27 cuts the gas injection port 15 and is formed corresponding to the size of the gas injection port 15. .

A hole jig 29 for forming a plurality of retainer mounting holes 16 is planted on the base 25 outside the cutting jig 27, and the hole jig 29 is used for the retainer mounting hole 1.
It is formed corresponding to the number of six.

Between the cutting jig 27 and the hole jig 29, a protrusion jig 31 formed lower than the cutting jig 27 and the hole jig 29 is formed. The projection jig 31 has a recess 33 formed at the upper end, and a projection 35 that fits into the recess 33 is formed on the upper mold 23.

As shown in FIG. 1, the base cloth of the main portion 11a constituting the mounting portion 13 and the reinforcing cloths 17a, 17b and 17c.
Is inserted between the receiving jig 22 and the upper die 23 of the ultrasonic cutter 21 in a laminated state.

The ultrasonic cutter 21 is operated, and the upper die 23
Is lowered and brought into contact with the cutting jig 27 and the hole jig 29, whereby the gas injection port 15 and the retainer mounting hole 16 are formed in the mounting portion 13. At this time, the mounting portion 13 is not cut by the protrusion jig 31.

Further, as shown in FIG. 2, the gas injection port 15 is provided.
At the same time when the retainer mounting hole 16 is formed, the projection 35 formed on the upper die 23 is formed into the recess 33 at the upper end of the projection jig 31.
Then, the base cloth of the main portion 11a constituting the mounting portion 13 and the reinforcing cloths 17a, 17b, 17c are pressed.

Therefore, the portion outside the gas inlet 15 and inside the fixed portion of the retainer undergoes thermal deformation due to melting, and a protrusion 19 for preventing the protruding state is formed inside the airbag body 11. The drop-out preventing projections 19 are not limited to those formed by ultrasonic heat molding or the like, and may be formed by high frequency heat press molding or the like.

Further, since the protrusions 19 for preventing slipping out are formed so as to project inward from the reinforcing cloth itself constituting the mounting portion 13, the sewing portion does not project to the base plate side, and the mounting portion 13 of the airbag body 11 is prevented. The adhesion between the base plate and the base plate can be improved, and the frictional resistance can be increased.

[0029]

The configuration and method of the airbag body of the airbag device and the method of manufacturing the same according to the present invention are described above. According to such a configuration, the mounting portion mounted on the base plate of the airbag body. Is formed by superimposing a reinforcing cloth on the base cloth, and at least the reinforcing cloth at a position corresponding to the inner portion of the retainer of the mounting portion is formed with a protrusion for preventing slippage, and the protrusion for preventing slippage is formed by ultrasonic heating. Or formed from the reinforcing cloth itself by high-frequency heating press molding,
It is possible to easily and quickly form a protrusion for preventing slipping out, and the sewn portion does not project to the base plate side, so that the adhesion between the mounting portion of the airbag body and the base plate can be improved, and the friction resistance is increased. It is possible to obtain an airbag main body of an airbag device which can be improved in strength and is excellent in safety.

Further, according to the method of manufacturing the airbag body of the airbag apparatus of the present invention, the protrusions for preventing slipping off are formed on at least the reinforcing cloth outside the gas injection port and inside the retainer by ultrasonic heating or high frequency. Since it is formed by heating means such as hot press molding, it is possible to easily and quickly form protrusions for preventing slipping out, and it is possible to reduce the number of work steps, and the sewing portion does not project to the base plate side, and the airbag body It is possible to improve the adhesion between the mounting portion and the base plate, improve the operation reliability, and obtain a method for manufacturing an airbag body of an airbag device having excellent safety.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an ultrasonic cutter used in a method for manufacturing an airbag body of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of an operating state of the ultrasonic cutter of the present invention.

FIG. 3 is a perspective view of a receiving jig of the ultrasonic cutter of the present invention.

FIG. 4 is a perspective view of the airbag body of the present invention as viewed from the mounting portion side.

FIG. 5 is a cross-sectional view showing a state in which a conventional airbag body is attached by a retainer.

FIG. 6 is a perspective view of the conventional airbag body as viewed from the mounting portion side.

[Explanation of symbols]

 11 Airbag body 11a Main part 11b Side part 13 Mounting part 15 Gas inlet 16 Retainer mounting hole 17a Reinforcing cloth 17b Reinforcing cloth 17c Reinforcing cloth 19 Detachment prevention protrusion 21 Ultrasonic cutter 22 Receiving jig 23 Upper die 25 Base 27 Cutting Jig 29 Hole Jig 31 Projection Jig 33 Recess 35 Projection

Claims (2)

[Claims] 1. An airbag main body of an airbag device, which has a gas injection port, is fixed to a base plate via a retainer, and is configured to inject and inflate gas from the gas injection port when the gas generator is activated. In the above, the airbag body is formed by sewing the edges of a plurality of base cloths, and the mounting portion mounted on the base plate is formed by superposing a reinforcing cloth on the base cloth, and the inside of the retainer of the mounting portion is formed. An airbag body of an airbag device, wherein at least a reinforcing cloth at a position corresponding to the portion is formed with a protrusion for preventing slippage. 2. A method for manufacturing an airbag main body of an airbag device, which is fixed to a base plate via a retainer and is configured to be inflated by injecting gas from a gas inlet when a gas generator is activated. The reinforcing cloth is superposed on the mounting portion of the base cloth to be attached to the base cloth and the reinforcing cloth is formed in the base cloth and the reinforcing cloth of the mounting portion of the inside portion of the retainer. A method for manufacturing an airbag main body of an airbag device, characterized in that projections for preventing slippage are formed on at least a reinforcing cloth by heating means.