JPH08216818A - Formation method of opening part of air bag - Google Patents

Abstract

PURPOSE: To simultaneously fix protective cloth by a drilling process of an opening part at the time of polymerizing and adhering reinforcing cloth to secure pressure proof strength and the protective cloth to protect a circumference of the opening part from inflator gas in the circumference of the opening part for inflator installation. CONSTITUTION: Opening parts 2 are simultaneously drilled and formed on a thermally melting main body cloth 1, a thermally melting reinforcing cloth 3 and a thermally melting protective cloth 4 by thermally melting means 5, 6 by way of polymerizing the thermally melting protective cloth 4 on the reinforcing cloth 3 in the same way after polymerizing and sewing the thermally melting reinforcing cloth 3 on a drilling point peripheral part of the opening part of the thermally melting main body cloth 1, and the protective cloth 4 is thermally fused on the main body cloth 1 or the reinforcing cloth 3 by this drilling and formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air bag made of a non-coated cloth material not coated with rubber or the like, and more specifically, to forming an opening for mounting an inflator on the air bag body of the non-coated cloth. It is about the method.

[0002]

2. Description of the Related Art An airbag device is a device that protects an occupant by inflating the airbag instantaneously when a vehicle collides, and is usually an inflator which is a gas generator, and an airbag bag which is inflated by the gas of the inflator. have. In the airbag device, the gas ejected from the inflator instantly fills the inside of the airbag to generate an internal pressure, and the internal pressure causes the airbag to expand and inflate.

By the way, the airbag is provided with an opening for mounting an inflator. A reinforcing cloth is secured around the opening to secure pressure resistance when the airbag is deployed, and when the inflator gas has a high temperature, a protective cloth that protects the circumference of the opening from the gas is used as the reinforcing cloth. It is polymerized and fixed on top of.

In the conventional method of forming the above-mentioned opening, the outer peripheral portion of the reinforcing cloth is sewn around the opening of the opening of the airbag body cloth, and then the protective cloth is superposed on the reinforcing cloth. hand,
The reinforcement cloth and the inner circumference of this protective cloth are sewn to the main body cloth at the same time,
After that, each of these cloths is cut to form the opening.

[0005]

By the way, in the opening, the reinforcing cloth needs to be firmly fixed to the main body cloth of the airbag by sewing because it is necessary to secure the pressure resistant strength. Since the purpose is to protect the periphery of the opening from the inflator gas, it is not necessary to fix it to the body cloth as strongly as the above-mentioned reinforcing cloth.

The present invention deals with the above-mentioned actual situation, and a process for fixing the protective cloth by integrating the protective cloth and the main body cloth by utilizing a process of punching an opening portion with a hot blade or the like. The purpose is to reduce.

[0007]

That is, according to the method of forming an opening portion of an airbag of the present invention which meets the above object, an opening portion for attaching an inflator is formed in a body cloth of a heat-meltable airbag, A method in which a reinforcing cloth for ensuring pressure resistance and a protective cloth for protecting the periphery of the opening from the inflator gas are polymerized and adhered around the opening, and heat fusion is applied to the periphery of the opening of the opening. After superimposing a flexible reinforcing cloth and sewing it to the main body cloth, the same heat-melting protective cloth is superposed on the above-mentioned reinforcing cloth, and then the main body cloth and the reinforcing cloth are protected by a heat-melting means such as a hot blade or laser The opening is formed in the cloth at the same time, and the protective cloth is heat-sealed to at least one of the main body cloth and the reinforcing cloth by the opening.

The protective cloth may be coated with silicone rubber on one side and heat-sealed so that the non-coated surface is in contact with the reinforcing cloth. Further, even when both the protective cloth and the reinforcing cloth are coated on one surface, they can be heat-sealed by polymerizing such that the uncoated surfaces contact each other.

Further, in the above-mentioned method of the present invention, bolts and rivet insertion holes for attaching an inflator are formed in the main body cloth, the reinforcing cloth and the protective cloth by the heat melting means, and also by the formation of the holes. It is also possible to heat-bond the protective cloth to at least one of the main body cloth and the reinforcing cloth.

[0010]

In the method of forming the opening of the present invention described above, the step of fixing the protective cloth to the main body cloth can be performed simultaneously by utilizing the punching process of the opening. Therefore, it has been conventionally performed to fix the protective cloth. This eliminates the need for sewing, which makes it possible to reduce part of the process.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a first step of a method for forming an opening according to an embodiment of the present invention, FIG. 2 is a sectional view showing a second step of the same, and FIG. 3 is a sectional view showing an opening after formation. FIG. 4 is a sectional view showing an airbag having an opening formed by the method of the same embodiment.

As shown in FIG. 4, a method of forming an opening portion of an airbag according to the present invention forms a circular opening portion 2 for attaching an inflator on a body cloth 1 of a heat-melting airbag made of nylon, polyester or the like. And a protective cloth 4 for protecting the periphery of the opening 2 from the gas of the inflator,
It is to be superposed on the periphery of the opening 2.

When the opening 2 is formed,
First, as shown in FIG. 1, two sheets of heat-meltable reinforcing cloth 3 are superposed on the peripheral portion of the opening 2 of the opening 2, and the outer peripheral portion of the reinforcing cloth 3 is sewn to the main body cloth 1. . The reinforcing cloth 3 is a circular cloth having a diameter larger than that of the opening 2.

Then, as shown in FIG. 2, a protective cloth 4 having the same heat melting property and a circular shape is superposed on the reinforcing cloth 3, and then the main body cloth 1, The opening 2 and the bolt / rivet insertion hole 7 for attaching the inflator are simultaneously formed in the reinforcing cloth 3 and the protective cloth 4, and the protective cloth 4 is reinforced with the main body cloth 1 by this hole formation. Heat-bond to the cloth 3. In addition,
The thermal fusion of the protective cloth 4 can be performed only on either the reinforcing cloth 3 or the main body cloth 1. A large number of the bolt / rivet insertion holes 7 are equally formed around the opening 2.

However, in the method of forming the opening of the embodiment of the present invention, the step of fixing the protective cloth 4 to the main body cloth 1 can be carried out simultaneously by utilizing the step of boring the opening 2. The sewing that was performed for fixing the protective cloth 4 is not necessary, and the steps required for creating the opening are
It is possible to reduce two.

The protective cloth 4 is fixed to the main body cloth 1 by the above-mentioned heat fusion. When the inflator is attached, the bolts and rivets are passed through the bolt / rivet insertion holes 7, and the inflator is also attached. Since the inner peripheral part is sandwiched between the flange part of and the ring-shaped retainer,
The fixed state during inflation is also stable.

[0018]

As described above, according to the method for forming an airbag opening of the present invention, the heat-melting reinforcing cloth is superposed and sewn on the periphery of the opening of the heat-melting main body cloth. rear,
Similarly, a heat-meltable protective cloth is polymerized with the reinforcing cloth, and then the main cloth, the reinforcing cloth and the protective cloth are simultaneously perforated by the heat-melting means, and the protective cloth is formed by the perforation formation. Is heat-fused to the main body cloth or the reinforcing cloth, and the step of fixing the protective cloth to the main body cloth can be carried out simultaneously by using the hole punching process of the opening portion. This eliminates the need for sewing, which results in a significant effect of reducing the steps required to create the opening and reducing the cost of the airbag.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first step of a method for forming an opening according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a second step of the same.

FIG. 3 is a cross-sectional view showing an opening after being created.

FIG. 4 is a cross-sectional view showing an airbag having an opening formed by the method of the embodiment.

[Explanation of symbols]

 1 Body cloth 2 Opening part 3 Reinforcing cloth 4 Protective cloth 5 Hot blade 6 Hot blade 7 Bolt rivet insertion hole

Claims (2)

[Claims] 1. A main body cloth of a heat-melting airbag is formed with an opening for attaching an inflator, and a reinforcing cloth for ensuring pressure resistance is provided around the opening, and an opening around the opening is provided from an inflator gas. A method of polymerizing with a protective cloth to be protected, wherein a heat-meltable reinforcing cloth is polymerized around the perforated portion of the opening and sewn to the main body cloth, and then a heat-meltable protective cloth is also used as described above. The opening is formed in the main body cloth, the reinforcing cloth and the protective cloth at the same time by polymerizing on the reinforcing cloth and then by a heat melting means such as a hot blade. A method for producing an opening of an airbag, characterized by heat-bonding to at least one of the reinforcing cloths. 2. A bolt / rivet insertion hole is formed in the main body cloth, the reinforcing cloth, and the protective cloth by the heat melting means, and the protective cloth is formed by at least one of the main body cloth and the reinforcing cloth. The method for producing an opening portion of an airbag according to claim 1, wherein one side is heat-sealed.