JPH07156735A - Method for making opening part of air bag - Google Patents

Abstract

PURPOSE:To easily prevent cloth ravels of a circumferential part of an opening at a low cost without executing the treatment such as heat melting in the open ing part such as an inflator mounting port and a vent hole of a non-coat air bag. CONSTITUTION:The corrugated ravel-preventing sewing 8 which is repeatedly striding the cutting line 7 is executed over the cutting line of an opening part 2 such as a vent hole, and then, the opening part 2 is cut on the cutting line 7, and cloth ravels are prevented by the thread of the ravel-preventing sewing 8 to be left on the circumferential part of this opening part.

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 an inflator mounting port or a vent hole provided in an air bag body of the non-coated cloth. The present invention relates to a method of creating an opening.

[0002]

2. Description of the Related Art An airbag device is a safety device that protects an occupant when an airbag is inflated in the event of a vehicle collision, and usually includes 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 a mounting hole for mounting an inflator and a vent hole for discharging gas inside after inflating. When creating openings such as mounting holes and vent holes, it is possible to cause fraying of the cloth by simply punching and cutting the uncoated cloth material as described above. The method of letting it take is adopted.

[0004]

However, in the method of subjecting the cloth cutting end to a special treatment such as heat fusion, as described above,
A heat fusion process must be provided after cutting the cloth, increasing man-hours and equipment, which is a problem in terms of manufacturing cost of the airbag.

The present invention deals with the actual situation as described above, and in particular, when cutting the opening of the non-coated cloth material, an appropriate treatment is applied to the cloth material in advance so that a special treatment such as the heat fusion is performed. Without cutting, cut by punching, etc.,
The purpose of the present invention is to reliably prevent fraying at low cost.

[0006]

That is, the method of forming the opening portion of the airbag of the present invention which meets the above-mentioned object is a method of forming the opening portion such as the inflator mounting port or the vent hole in the non-coated cloth material. It is characterized in that wavy-line anti-fray stitches that straddle the cutting line are repeatedly provided on the cutting line of the opening, and then the opening is cut by the cutting line.

[0007] In the method of the present invention, it is also possible to lap the reinforcing cloth or the like around the perforated portion of the opening, and then to carry out the anti-fray sewing on the airbag cloth material together with the overlapping member.

[0008]

According to the method of the present invention, the fray-stopping sewing is divided by the cutting line, but the sewing thread remaining around the opening prevents the movement of the weaving thread at the peripheral edge of the opening, and thus the peripheral edge of the opening is closed. It is possible to prevent the cloth from being frayed.

[0009]

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

1 to 3 are process diagrams of a method of forming an opening taking the inflator mounting port of the embodiment of the present invention as an example, and FIG. 4 is a plan view of an airbag manufactured by the method of the embodiment of the present invention. As shown in FIG. 4, this airbag has two substantially circular cloths 1 (one is not shown) of uncoated cloth material such as nylon which is not coated with rubber or resin.
The outer peripheral edge portions of these cloths 1 are sewn to each other to be formed into a bag shape having an inflator mounting opening 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 polymerized from the back side of the airbag, and are sewn to the cloth material 1 of the airbag body by sewing 5. There is.

On the other hand, the method of forming the opening according to the embodiment of the present invention is as shown in FIGS. 1 to 3. Here, the inflator mounting port 2 will be described as an example.

That is, first of all, as shown in FIG. 1, the reference holes 6 are aligned with the peripheral portion of the hole of the mounting port 2, and the reinforcing cloth 4 is provided.
And are sewn to the inflator side cloth 1 by sewing 5. The reinforcing cloth 4 is made of a non-coated cloth material like the airbag cloth material 1.

Next, as shown in FIG. 2, a wavy line anti-fray sewing 8 is repeatedly provided on the cutting line 7 of the mounting opening 2 over the entire circumference of the cutting line 7 as shown in the drawing. The anti-fray sewing 8 is a wavy line that repeats a circular arc in this embodiment, but it can also be applied in a zigzag wavy line such as a broken line. Further, the widths L ₁ and L ₂ of the portions of the anti-ravel sewing 8 left on the peripheral edge side of the opening are
About 2 to 30 mm is suitable.

After the anti-ravel sewing 8 is performed, the inflator side cloth 1 and the reinforcing cloth 4 are cut on the cutting line 7 to open the inflator mounting port 2 as shown in FIG. This cutting can be performed by ordinary punching cutting.

Therefore, in the method of the embodiment of the present invention,
The anti-fray sewing 8 is divided by the cutting line 7,
As shown in FIG. 3, the sewing thread remaining around the mounting opening 2 prevents movement of the weaving thread in the peripheral portion of the mounting opening 2,
It is possible to prevent the cloth from being frayed at the peripheral portion of the mounting opening.

Although the embodiment of the present invention has been described by taking the inflator mounting port 2 as an example, the vent hole 3 can be formed in the same manner as described above.

[0017]

As described above, according to the method for forming an airbag opening of the present invention, a wavy linear fray stopper for repeatedly cutting the cutting line is formed on the cutting line of the opening such as the inflator mounting port and the vent hole. The sewing is performed, and then the opening is cut by the cutting line. The fraying-stop sewing thread remaining around the opening suppresses the movement of the weaving thread at the peripheral edge of the opening. Due to
The present invention has a remarkable effect of preventing the cloth fraying at the peripheral edge of the opening easily and at low cost without taking any special treatment such as conventional heat fusion.

[Brief description of drawings]

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

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

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

FIG. 4 is a plan view of an airbag manufactured by the method of the embodiment of the present invention.

[Explanation of symbols]

 1 Airbag cloth material 2 Inflator mounting port 3 Vent hole 4 Reinforcing cloth 5 Sewing 6 Reference hole 7 Cutting line 8 Anti-fray sewing

Claims (1)

[Claims] 1. A method of forming openings such as an inflator mounting opening and a vent hole in a fabric material of an airbag that is not coated with rubber or resin, the cutting being performed on a cutting line of the opening. A method for producing an opening of an airbag, characterized in that wavy-line anti-fray sewing that crosses lines repeatedly is performed, and then the opening is cut by the cutting line.