JPH08301035A - Making method of opening part of air bag - Google Patents

Abstract

PURPOSE: To restrain parting from layered reinforning cloths, improve dimensional accuracy of an opening part thickness, and improve joining force of a fusing part of a cutting part when an opening part such as an inflator installing port of an air bag and a vent hole is formed by a hot edge. CONSTITUTION: Thermally meltable reinforcing cloths 4 are superposed on a hole boring peripheral part of air bag cloth material 1 composed of thermally meltable cloth, and sewing 7 to join both cloth materials 1 and 4 together is performed in close vicinity to cutting lines 5a and 5b on the ouside of the opening part cutting lines 5a and 5b of an inflator installing port or the like, and afterwards, the air bag cloth material 1 and the reinforcing cloths 4 are simultaneously melted and cut in the cutting lines 5a and 5b by a hot edge 8, and an opening part is formed.

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 heat-fusible material such as a non-coated cloth material which is not coated with rubber or the like, and more particularly to an air bag body made of this heat-fusible material. The present invention relates to a method of creating an opening portion such as an inflator mounting port or a vent hole.

[0002]

2. Description of the Related Art An air bag device is a device for restraining an occupant by expanding an air bag when a vehicle collides, and usually includes an inflator which is a gas generator and an air bag body which is inflated by gas of the inflator. Have

By the way, the airbag is provided with a mounting hole for mounting an inflator and a vent hole for discharging gas inside after inflating. In the case of forming openings such as these mounting holes and vent holes, cloth fraying occurs if the heat-melting cloth material as described above is simply punched and cut. Therefore, for example, it is disclosed in JP-A-7-2037. As described above, the method of fusing the cutting end of the cloth material by using the heat cut cutting is adopted.

[0004]

However, in the above-described conventional method of forming the opening, since the hot blade is simply applied to the laminated cloth material to punch it, when the blade die 8 is pulled out as shown in FIG. The cutting ends of the cloths 1 and 4 follow the hot blades 8 separately and the laminated cloths 1 and 4 are easily separated, and the laminated thickness of the opening 2'becomes large. There is a problem that the bonding strength of the fusion-bonded part is reduced.

The present invention copes with the actual situation as described above, and pre-sewn on the outside of the cutting line of the opening to suppress the loosening of the laminated cloth material and to improve the dimensional accuracy of the thickness of the opening. It is intended to improve and further increase the bonding strength of the fused portion.

[0006]

That is, the method of forming an airbag opening according to the present invention, which is suitable for the above-mentioned object, includes a cloth material for a heat-fusible airbag as described above, an inflator mounting opening, a vent hole and the like. A method of creating an opening with a hot blade, wherein a heat-meltable cloth material such as a reinforcing cloth is polymerized around the perforated portion of the opening, and the cutting line is formed outside the cutting line of the opening. Sewn the two cloth materials in close proximity to each other, and then simultaneously melt-cut the airbag cloth material and the cloth material such as the reinforcing cloth with the hot blade at the cutting line to form the opening. It is characterized by

[0007]

In the above-mentioned method of the present invention, since sewing is performed in the vicinity of the cutting line of the opening in advance, each cloth material is less likely to come apart when the hot blade is pulled out from the laminated cloth material,
This makes it possible to improve the dimensional accuracy of the thickness of the opening and the bonding strength of the fused portion.

[0008]

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

FIG. 1 to FIG. 3 are process diagrams of a method of forming an opening taking an inflator mounting port and the like according to an embodiment of the present invention as examples.
Is a plan view showing the relationship between the opening cutting line and sewing in the method of the embodiment, FIG. 5 is a plan view of the airbag manufactured by the method of the embodiment, and as shown in FIG. Two substantially circular cloths made of heat-fusible cloth such as nylon 1
(One is not shown), and the outer peripheral edge portions of these cloths 1 are sewn to each other to form a bag shape having an inflator mounting port 2 and a vent hole 3. Then, around the openings that form the mounting opening 2 and the vent hole 3, the reinforcing cloth 4 and the like are superposed from the back side of the airbag and sewn to the cloth material 1 of the airbag body.

On the other hand, the method of forming the above-mentioned opening portion according to the embodiment of the present invention is as shown in FIGS.
The bolt holes 6 will be described as an example.

That is, first, as shown in FIG. 1, three reinforcing cloths 4 are superposed on the peripheries of the mounting holes 2 and the bolt holes 6. The reinforcing cloth 4 is uncoated like the airbag cloth material 1 and is also made of heat-meltable fiber.

Next, as shown in the same drawing, the airbag cloth material 1 is provided outside the cutting lines 5a and 5b of the attachment port 2 and the bolt hole 6 and close to the cutting lines 5a and 5b.
The sewing 7 for joining the reinforcing cloth 4 and the reinforcing cloth 4 is performed. And FIG.
As shown in FIG. 3, the airbag cloth 1 and the reinforcing cloths 4 are simultaneously melt-cut by the hot blades 8 along the cutting lines 5a and 5b to form the mounting holes 2 and the bolt holes 6 as shown in FIG. To do. The inner peripheral surfaces of the mounting ports 2 and the bolt holes 6 are fused to each other by the above-mentioned fusion cutting.

The sewing 7 may be applied so as to surround the entire outer peripheral portion of the opening such as the mounting opening 2.
When the diameter of the opening is small, for example, around 10 mm,
As shown in FIG. 4, it may be applied substantially linearly on both sides of the opening cutting line 5. The distance L between the cutting line 5 of these openings and the sewing 7 is appropriately 0 <L ≦ 25 mm, more preferably 2 ≦ L ≦ 10 mm.

In the method of forming the opening of the embodiment of the present invention, however, since the sewing 7 is applied in advance in the vicinity of the cutting line 5 of the opening, the laminated airbag as shown in FIG. Even when the hot blade 8 is pulled out from the cloth material 1 and the reinforcing cloth 4, the cloths 1 and 4 are hard to come apart, which allows the cloths 1 and 4 to be fused smoothly and the dimensional accuracy of the opening thickness can be improved. It becomes possible to improve. Further, it is possible to further improve the bonding strength of the fusion-bonded portion formed in the cut portion.

Although the embodiment of the present invention has been described with reference to the inflator mounting port 2 and the bolt hole 6, the vent hole 3 can be formed in the same manner as described above.

[0016]

As described above, according to the method for forming an airbag opening of the present invention, a heat-fusible cloth material such as a reinforcing cloth is polymerized around the perforated portion of the air-bag cloth material made of a heat-fusible material. At the same time, sewing is performed on the outside of the cutting line of the opening such as the inflator attachment port so as to join the two cloth materials in the vicinity of the cutting line, and then the air bag cloth material and the reinforcing cloth, etc. are cut along the cutting line. The cloth material and the cloth material are simultaneously melt-cut by a hot blade to form the opening, and in the method of the present invention, since sewing is performed in the vicinity of the cutting line of the opening in advance, they are laminated. Even when pulling out the hot blade from the cloth material, it is difficult for each cloth material to come apart, which improves the dimensional accuracy of the opening thickness compared to the conventional one, and further improves the bonding strength of the fusion-bonded part. It has a remarkable effect.

[Brief description of drawings]

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

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

FIG. 3 is a partial sectional view showing a third step of the same.

FIG. 4 is a plan view showing a relationship between an opening cutting line and sewing in the method of the embodiment.

FIG. 5 is a plan view of an airbag manufactured by the method of the embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing the operation of the method of the embodiment.

FIG. 7 is a partial cross-sectional view showing a loose state of a laminated cloth material according to a conventional method.

[Explanation of symbols]

 1 Airbag cloth material 2 Inflator mounting port 3 Vent hole 4 Reinforcing cloth 5, 5a, 5b Cutting line 6 Bolt hole 7 Sewing 8 Heat blade

Claims (1)

[Claims] 1. A method of forming openings such as an inflator mounting opening and a vent hole in a cloth material for a heat-fusible airbag with a hot blade, wherein a reinforcing cloth or the like is formed around the opening of the opening. Along with polymerizing the heat-meltable cloth material, sewing is performed on the outside of the cutting line of the opening so as to join the two cloth materials in the vicinity of the cutting line, and then, with the airbag cloth material on the cutting line. A method for producing an opening of an airbag, which comprises simultaneously melting and cutting a cloth material such as the reinforcing cloth with the hot blade to form the opening.