JPH09156440A - Manufacture of air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the reduction of workability due to the occurrence of the displacement between a back fabric and reinforcing members and improve productivity by cutting and depositing a reinforcing body to the back fabric, then sewing the reinforcing body and the back fabric together in the connecting process of the reinforcing body to the back fabric. SOLUTION: An inflator opening 6 bored for fitting an inflator 5 and a vent hole opening 7 for releasing air when an air bag 1 is deployed are formed on the air bag 1. A reinforcing member 8 is arranged around the inflator opening 6, and a reinforcing member 9 is arranged around the vent hole opening 7. In the connecting process of a reinforcing body constituted of the reinforcing members 8, 9 to a back fabric 3, the reinforcing body is cut and deposited to the back fabric 3, then the reinforcing body and the back fabric 3 are sewn together. The reduction of workability due to the occurrence of the displacement between the back fabric 3 and the reinforcing members 8, 9 is prevented, and productivity can be improved.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a driver, a passenger seat,
Regarding an airbag for a vehicle installed on a side surface, a rear seat, or the like, more specifically, in an airbag, a method for manufacturing an airbag in which a step of joining a reinforcing member joined to an inflator opening and / or a vent opening is improved, And an airbag manufactured through this process.

[0002]

2. Description of the Related Art An airbag used for protecting an occupant of a vehicle has, for example, a steering wheel or the like having a back cloth located on the vehicle body side and an outer cloth located on the occupant side. The outer peripheral portions thereof are joined by sewing or the like to form a bag. Then, an inflator for inflating and deploying the airbag is inserted and installed in an inflator opening formed substantially in the center of the back cloth. At that time, a reinforcing cloth or the like laminated in layers to reinforce the inflator opening is joined to the periphery of the inflator opening.
Further, after the airbag has been deployed due to a vehicle collision or the like and has been deployed, a vent opening is often formed in the back cloth for venting air in order to protect the occupant from excessive impact when contacting with the occupant. Then, the periphery of the vent opening is also reinforced by the reinforcing member. Generally, these reinforcing members are joined to the back cloth by suturing with a suture.

The details of the stitching process have heretofore been carried out by a method in which a reinforcing member is brought into contact with a backing cloth for sewing, and then cut into a predetermined shape to form an opening. Here, since each member is merely pressed and brought into contact with each other, at the stage of advancing the sewing operation of the reinforcing member to the back cloth,
The back cloth and the reinforcing member were often misaligned.
Further, in many cases, the reinforcing members are often formed in layers in order to have various functions, and in this case, the above-mentioned misalignment occurs between the layers constituting the reinforcing members, which is particularly remarkable. Such displacement of the reinforcing member affects the pressure resistance of the airbag. So at this time,
The work was carried out while adjusting the positional deviation, and there was a situation that affected productivity.

[0004]

SUMMARY OF THE INVENTION According to the present invention, in a method of manufacturing an airbag, by improving the stitching process of such a reinforcing member to a back cloth, a positional deviation between the back cloth and the reinforcing member occurs. This is intended to prevent a decrease in workability due to the above and improve productivity.

[0005]

For this reason, according to the present invention, the back of the inflator opening formed in the substantially center and / or the vent opening formed at an appropriate position is joined and reinforced by a reinforcing member. A method of manufacturing an airbag in which an outer peripheral portion of a cloth and an outer peripheral portion of a front cloth having substantially the same shape as that of the back cloth are joined together to form a bag, and a step of joining the reinforcing body to the backing cloth The process comprises cutting and welding to the back cloth, and then sewing the reinforcing body and the back cloth.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall view of an airbag. FIG. 1A is an overall view including a partial cross section of an airbag. FIG. 1 (B) is a sectional view of the airbag in which the inflator is incorporated. The airbag 1 includes a front cloth 2 and a back cloth 3, which are substantially circular nylon (6 nylon, 66 nylon), polyester,
It is made of synthetic fiber such as polyimide, and there is a case of coating the synthetic fiber and a case of not coating the synthetic fiber. The airbag 1 is formed with an inflator opening 6 for mounting the inflator 5 and a vent hole opening 7 for letting air escape when the airbag is deployed. A reinforcing member 8 is arranged around the inflator opening 6, and a reinforcing member 9 is arranged around the vent hole opening 7.

In FIG. 2 (A), the inflator 5 is attached to the inflator opening 6 by using the bolts 11 and the base plate 1
It is a detailed view of the state where it was attached to 0 via the relayer 12. Here, the opening reinforcing member 8 for the inflator is composed of the reinforcing layers 81, 82 and 83, and 84 arranged between the base plate 10. Here, both the back cloth 3 and the reinforcing member 8 are made of uncoated 66 nylon fiber.
In this case, the reinforcing layer may be made of the same material as the above-mentioned front cloth and back cloth, or may be a urethane-bonded woven cloth, or a urethane film or a nylon film. This reinforcing layer has various functions. In this structure, 84 is for the purpose of protecting the backing cloth 3 from the base plate, 82 and 83 are for strengthening the ends of the backing cloth 3, and The widest outermost layer 81 causes a vehicle collision or the like,
When the inflator operates and a high temperature, high pressure gas is ejected from the inflator opening 6 to deploy the airbag, the back cloth 3 is protected from the gas. For this reason, it has a wide structure, and the surface is coated with silicone rubber in order to prevent gas permeation.

Here, FIG. 2B shows this reinforcing member 8.
And a backing cloth 3 joining process according to the present invention.
First, the reinforcing member 8 and the back cloth 3 are brought into contact with each other. After that, the inflator opening 6 is defined by cutting along the dotted line A by a means such as laser beam, high frequency, or heat. At this time,
Each member is cut by melting at each end. Cutting by melting also takes care of the fraying of the end portion during cutting. Then, the respective members are welded and connected at the same time in the molten portion.

As a result, as shown in FIG. 2 (C), the respective members are temporarily fixed at the cut ends 61. Next, sewing, which is a joining means for joining the respective members, is performed and the sewing portion 6
2 is formed appropriately over the entire circumference of the end of the opening. As a result, the reinforcing members are joined together, and the reinforcing member and the back cloth are joined together with sufficient strength. By the way, during sewing work, each member
It is easy to cause misalignment only by pressing. However, in the present invention, as described above, since the respective members are temporarily fixed to each other at the ends by welding, the positional displacement between the members does not occur. Conventionally, the sewing was performed first, but if the sewing is performed in the state of FIG. 2B, for example, the sewing is performed after pressing from the upper portion of the reinforcing layer 81, but the inner layer 82, 83 is easy to move, and in this case, the reinforcing layer 81 is wide and the reinforcing layers 82, 8
3 will be covered and it will be difficult to find the internal displacement. According to the present invention, such a situation cannot occur.
The process of the present invention is not limited to the arrangement of the reinforcing members as shown in FIG. 2B, but is effective even if the laminated structure of the reinforcing members, the size, and the arrangement order are changed. Further, the constitution of the front cloth 2 and the back cloth 3 may occur in the case where they are integrally clothed or divided into three, but the joining of the reinforcing members described here is also applied in such a case. .

Further, during a series of work, when the work place is moved due to the flow of the process, so-called handling of members often occurs, and even in such a case,
According to the present invention, since the back cloth and the reinforcing member are integrated by welding at the beginning of the process, the handling is easy and the working efficiency is effectively exerted.

Next, FIG. 3 shows a case where the present invention is used for a vent hole opening. In FIG. 3 (A), after the vent hole reinforcing member 9 contacts the back cloth 3, cutting welding is performed along the dotted line B. The reinforcement member for the vent hole generally does not require much reinforcement as compared with the opening for the inflator. In this case, the reinforcing member consisting of only one layer is joined. Here, both the back cloth 3 and the reinforcing member 9 are made of uncoated 66 nylon fiber. In this case, the same function as in the case of forming the opening for the inflator described above is performed. That is, as seen in FIG. 3B, sewing is performed with the end portion 71 welded and temporarily fixed, and the sewn portion 72 is formed to join the vent hole reinforcing member 9 to the back cloth 3. However, at this time, the positional deviation does not occur. As in the case of the inflator opening, the use of a laminated structure as the reinforcing member and the design change such as the use of various materials depending on the purpose may occur.

According to the present invention, not only is the productivity of the airbag improved, but the airbag manufactured by these processes is reinforced by the reinforcing member and the back member as compared with the airbag manufactured by the conventional process. Since there are no variations in the joints of the cloth, it is also excellent in durability and other performances.

[0013]

As is apparent from the above description, according to the present invention, the step of joining the reinforcing member disposed around the inflator opening or the vent opening formed in the airbag is performed. By the improvement, it is possible to eliminate the positional displacement of each member and the complexity of handling that have occurred in the conventional manufacturing, improve the productivity of the airbag, and obtain an excellent airbag.

[Brief description of the drawings]

FIG. 1 is an overall view and a cross-sectional view showing an airbag.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a front view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Airbag 2 Front cloth 3 Back cloth 5 Inflator 6 Inflator opening 7 Vent opening 8 Inflator opening reinforcing member 9 Vent opening reinforcing member 10 Base plate 11 Bolt 12 Retainer 13 Inflator opening

[Procedure amendment]

[Submission date] December 22, 1995

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Airbag manufacturing method

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

The present invention relates to a vehicle airbag installed in a driver's seat, a passenger seat, a side surface, a rear seat, etc.
The present invention relates to a method for manufacturing an airbag, in which the step of joining a reinforcing member joined to the inflator opening and / or the vent opening is improved.

[Procedure Amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

[Fig. 2]

Claims (2)

[Claims] 1. An outer peripheral portion of a backing cloth and a backing cloth, in which the periphery of an opening for an inflator formed substantially in the center and / or a vent opening formed at an appropriate position is joined and reinforced by a reinforcing member. In a method for manufacturing an airbag, which is formed by joining the outer peripheral portion of a same-shaped outer cloth into a bag shape, in the step of joining the reinforcing body to the back cloth, the reinforcing body is cut and welded to the back cloth, and then the A method of manufacturing an airbag, comprising a step of sewing a reinforcing body and the back cloth. 2. An airbag manufactured by the manufacturing method according to claim 1.