JPH07156731A - Manufacture of air bag for vehicle - Google Patents

Abstract

PURPOSE:To improve the workability of the process to reverse an air bag to the face side, and reduce the sewing man-hour of a strip-shaped body constituting a strap in the manufacturing of the air bag with strap to regulate the developed shape of the air bag. CONSTITUTION:In an air bag to form a strap 4 by executing the intermediate sewing of strip-shaped bodies 3, after the air bag is reversed to the face side, the strip-shaped body 3 is pulled outside from an opening part 5 of the air bag, and free end parts 3a of these strip-shaped bodies 3 are sewn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag device which inflates in the event of a vehicle collision and protects an occupant, and more particularly to an airbag centering on a strap which regulates the deployment shape of the airbag. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art An air bag device is a safety device that protects an occupant by inflating the air bag instantaneously when a vehicle collides, and usually includes an inflator which is a gas generator and an air bag which is inflated by gas of the inflator. And an airbag case that encloses the inflator together with the airbag.

As shown in FIG. 6, for example, the airbag has an inflator side cloth 1 having an opening 5 for mounting an inflator, and an occupant side cloth 2 having substantially the same shape as the cloth 1.
It is often manufactured by stitching the outer peripheral edge portions of each other.

[0004]

By the way, a strap may be provided in order to regulate the deployment shape of the airbag. The structure is, for example, as shown in FIG. 7, and the strap 4 ′ is the inflator side cloth 1 of the airbag.
And a part of each of the two reinforcing cloths 7 attached near the center of each of the occupant-side cloths 2 are integrally extended to provide a plurality of strip-shaped bodies 8, and the end portions of these strip-shaped bodies 8 face each other. Reinforcing cloth strip 8
It is formed by stitching with the free end of the.

However, in the conventional method of attaching the strap, as shown in FIG.
Since the straps are formed by stitching the free ends of the strips together, the straps are an obstacle and it is difficult to perform the work of inverting the airbag to the front side.The sewing of the strips is also disturbed by the airbag body. There was such an inconvenience.

An object of the present invention is to cope with the above-mentioned actual situation and to find a new method of attaching a strap, thereby facilitating the reversing operation of the airbag and the sewing of the belt-shaped bodies. Is.

[0007]

That is, in the method of manufacturing an airbag of the present invention which achieves the above object, a plurality of belt-shaped bodies are paired around the center of the inflator side cloth and the passenger side cloth of the airbag. A method for manufacturing an airbag in which the straps for restricting the deployment shape of the airbag are formed by sewing the free ends of the pair of band-shaped bodies together as described above, wherein the inflator side cloth and the occupant side are While attaching the attachment bases of the respective strips to the respective cloths and sewing the outer peripheral edge portions of the inflator side cloth and the occupant side cloth, the airbag is turned upside down from the inflator attachment opening and turned upside down. It is characterized in that each of the band-shaped bodies is pulled out from the opening of the turned-up airbag and the free end portions forming a pair of the band-shaped bodies are sewn together.

[0008]

In the method of the present invention, since the belt is sewn after the air bag is turned upside down and turned upside down, the strap does not get in the way at the time of turning up and the workability is improved. It is possible to smoothly perform the reversing work.

Further, since the above-mentioned band-shaped body can be sewn while being pulled out from the opening of the airbag, the airbag can be sewn very easily without interfering with the airbag. Is possible.

Furthermore, by arranging and pulling out the drawn strips in parallel for each set, it is possible to sew a plurality of sets of strips at the same time, and it is possible to reduce the number of sewing steps for making straps. is there.

[0011]

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

FIG. 4 is a cross-sectional view showing an airbag manufactured by the manufacturing method according to the embodiment of the present invention, and FIG. 6 is a perspective view of the same. The airbag has an inflator side where outer peripheral edges are sewn together. A plurality of strips 3 are sewn in pairs near the centers of the cloth 1 and the occupant-side cloth 2, and the free ends 3a of the strips 3 forming a pair are sewn together to deploy the airbag. The shape regulating strap 4 is formed.
An opening 5 for attaching an inflator is formed at substantially the center of the inflator side cloth 1.

As the structure of the strap 4, it is possible to adopt one in which all the band-shaped bodies 3 are apart from each other, but as shown in FIG. 7, the mounting base portion of the band-shaped body 3 has a donut shape or a circular shape. The one formed integrally with a reinforcing cloth or the like is preferable. In addition, a reinforcing cloth is usually polymerized around the opening 5 and a portion of the occupant side cloth 3 facing the opening 5, but it is omitted in each of the drawings described in this embodiment.

On the other hand, according to the manufacturing method of the embodiment of the present invention, the above-mentioned air bag is manufactured. First, as shown in FIG. 1, each of the above-mentioned strips is formed on the inflator side cloth 1 and the passenger side cloth 2. The attachment base portion 3b of the body 3 is sewn, and the outer peripheral edge portions of the inflator side cloth 1 and the passenger side cloth 2 are sewn together.

Next, as shown in FIG. 2, the air bag is turned upside down from the opening 5 and then, as shown in FIG.
The respective band-shaped bodies 3 are pulled out from the above, and as shown in FIG. 3, the free ends 3a forming a pair of these band-shaped bodies 3 are sewn together to form the strap 4.

The free ends 3a of the strip 3 are sewn together by twisting the strip 3 by 90 ° from the state shown in FIG. 2 and, as shown in FIG. In the state where 3a is superposed, it is set so as to be aligned in parallel with the free ends 3a of the other set. By performing sewing in the left-right direction in the figure in this state, it is possible to perform sewing at the same time regardless of the number of pairs of the band-shaped bodies 3, that is, the straps 4.

However, in the method of manufacturing the airbag according to the embodiment of the present invention, as described above, the belt 3 is sewn after the airbag is turned upside down and turned upside down. The strap 4 does not get in the way at the time of reversing, it is possible to improve the workability and perform the reversing work smoothly and smoothly.

Further, since the band-shaped body 3 can be sewn while being pulled out from the opening 5 of the airbag, the bag-shaped bodies can be sewn together very easily without the airbag becoming an obstacle. It is possible. As described above, the band-shaped bodies can be sewn together by arranging the pulled-out band-shaped bodies 3 in parallel for each set and sewing them together.
It is possible to reduce the man-hours for sewing to make the strap.

[0019]

As described above, according to the method of manufacturing an airbag of the present invention, in the airbag in which the strap is formed by intermediately sewing the belt-shaped body, after the airbag is turned over to the front side, The straps are pulled out from the opening and the free ends of these straps are sewn together.Since the straps are sewn after the airbag is turned upside down, the straps can be sewn when flipping as in the conventional case. It is possible to improve the workability and perform the above-mentioned reversing work smoothly and smoothly without causing any hindrance, and when the suture of the belt-like body is pulled out from the opening of the airbag. Since this can be done, it is possible to sew the band-shaped bodies to each other very easily without the airbag getting in the way. And, as for the stitching of the band-shaped bodies, the plurality of sets of band-shaped bodies can be sewn at the same time by aligning the pulled-out band-shaped bodies in parallel for each group and sewing, thus reducing the number of sewing steps for making the strap. It has the effect of reducing.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first step of an airbag manufacturing method 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 sectional view showing a third step of the same.

FIG. 4 is a sectional view showing a fourth step of the same.

FIG. 5 is a perspective view showing an example of sewing the band-shaped bodies together.

FIG. 6 is a perspective view of the airbag of the same manufacturing example.

FIG. 7 is a perspective view showing a manufacturing example of a conventional airbag.

[Explanation of symbols]

 1 inflator side cloth 2 occupant side cloth 3 strip 3a free end of strip 3b strip base 4 strap 5 opening 6 sewing table

Claims (1)

[Claims] 1. A plurality of belt-shaped bodies are sewn in pairs near the centers of an inflator side cloth and an occupant side cloth of an airbag, and the free ends of the paired belt-shaped bodies are sewn together. In the airbag in which the deployment shape regulating strap of the airbag is formed by the above, the attachment bases of the belt-shaped bodies are sewn to the inflator side cloth and the passenger side cloth, respectively, and the inflator side cloth and the passenger side cloth are also sewn. The outer peripheral edge of the air bag is sewn, then the air bag is turned upside down from the opening for attaching the inflator, and then the belt-shaped body is pulled out from the opening of the turned-up air bag. A method of manufacturing an air bag for a vehicle, which comprises stitching free end portions of each other.