JPH02270655A - Strap member for air bag - Google Patents

Abstract

PURPOSE:To surely install a strap member in a simple manner by connecting two woven cloth pieces used as a prescribing part for the separation distance, one woven cloth piece for connecting the above-described two woven cloth pieces, two woven cloth pieces extended from each boundary line of the above- described woven cloth pieces by the woven tissues. CONSTITUTION:A strap member is used for prescribing the separation distance between the obverse layer cloth 7 and the reverse layer cloth 8 of an air bag 11, when the air bag 11 is expanded. In this case, the strap member consists of two woven fabric pieces A and A' used as a prescribing part for the separation distance, one woven cloth piece B for connecting two woven cloth pieces A and A', and two woven fabric pieces C and C' extended from the respective boundary lines 3a and 3b between two woven cloth pieces A and A' and one woven B. On each boundary line 3a, 3b, three woven fabric pieces A - C and A' - C' are connected by a woven tissue. Therefore, the strap member can be installed surely in a simple manner without using a reinforcing cloth.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a strap material for an air bag.

More specifically, the present invention relates to a strap material used to define the distance between the surface fabric and the back fabric of the airbag to a predetermined value when the airbag is inflated.

[Conventional technology]

2. Description of the Related Art It is known to use airbags made of fabric sewn into a bag shape to prevent personal injury caused by automobile collisions. An airbag usually has a strap material on the inside that defines the distance between the surface fabric and the back fabric, which prevents the human body from colliding with the vehicle body when the airbag inflates, and also prevents the human body from being pushed backwards excessively. Preventing it from being returned.

[Problem to be solved by the invention]

Conventionally known strap materials are tape materials obtained by cutting a single-ply fabric used as the surface cloth or back layer cloth of an airbag, or narrow-width fabrics woven with a tape loom. Since these tape materials are simply long pieces of tape, it is necessary to use many pieces of reinforcing fabric when joining the airbag to the surface fabric or back layer fabric, resulting in a time-consuming installation of the strap material. This increases the cost and complicates the structure. Furthermore, since the number of members used near the strap material increases, the airbag becomes coarse and hard, bulky, increases in weight, and becomes difficult to store. Furthermore, if the strap materials are joined by sewing, there is a problem in that the airbag may be cut from that part.

The present invention solves the above-mentioned problems of conventionally known strap materials, allows reliable attachment to the airbag body with simple work, and allows the resulting airbag to be stored in a lightweight and flexible manner. It is an object of the present invention to provide a strap material that can have good properties.

[Means to solve the problem]

The above-mentioned object of the present invention is that the strap material has two woven fabric pieces A and A' used as the separation distance defining part, and a woven fabric piece B that connects the two woven fabric pieces A and A'. and woven fabric pieces C and C' extending from the boundary line 3a between the woven fabric piece A and the woven fabric piece B and the boundary line 3b between the woven fabric piece A' and the woven fabric piece B, respectively.
An airbag strap comprising three woven fabric pieces A, B, and C and three woven fabric pieces A', B, and C' connected by a woven structure at each of the boundary lines 3a and 3b. achieved by materials.

The airbag strap material has a double line part in the center and a partially double knitted fabric having single weave parts on both sides of the double line part, and after cutting it to a predetermined width, the double line part is woven. It can be made by cutting one piece of woven fabric approximately in the middle.

In this case, the single weave parts on both sides of the double line part of the partially double weave fabric become fabric pieces A and A' that serve as separation distance defining parts, and the uncut part of the double line part becomes woven fabric pieces A and A'. Woven fabric piece B
The woven fabric pieces cut into two at the double line portion become woven fabric pieces c and c', respectively.

The strap material for an airbag made in this way is made by joining the woven fabric piece B and the woven fabric pieces C1C' extending on both sides of the woven fabric piece B to the surface fabric on the human body side of the airbag, and attaching each of the woven fabric pieces A and A'. The end portion may be joined around the inflator mounting opening. The woven fabric pieces Δ and Δ' are connected to the woven fabric pieces B and woven fabric pieces c and c' by the woven structure, so that they are securely connected, and there is no need to use a reinforcing fabric when attaching them to the airbag. There are almost no As a result, if the air bag strap material of the present invention is used, installation can be completed in a short time, leading to lower costs, and the structure is simplified and storage performance is improved.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing an example of an air bag strap material and a method of attaching the strap material to an air bag according to the present invention.

FIG. 1 shows a perspective view of an example of an airbag strap material according to the present invention. As shown in Fig. 1, the airbag strap material has woven fabric pieces A, A' and woven fabric pieces c, c' extending from boundary lines 3a, 3b at both ends of woven fabric piece B, respectively. A plurality of threads extending in the direction indicated by the double-headed arrow Xa on the cloth piece A include some of the threads extending in the direction shown by the double-headed arrow Xb on the cloth piece B.
The unilateral thread is continuous with the plurality of threads extending in the direction indicated by the double-headed arrow Xc of the woven fabric piece C. Therefore, the woven fabric piece A is connected to the woven fabric piece B and the woven fabric piece C by the weave structure at the boundary line 3a.

Also at the boundary line 3b, woven fabric piece A' is woven fabric piece B and woven fabric piece C.
′, they are connected by a woven structure.

FIGS. 2 and 3 show a method of manufacturing the Slap material shown in FIG. 1. As shown in FIG. 2, by arranging the warp threads in the direction of arrow T and driving the weft threads in the direction of arrow W, a double line part 2 is provided in the center, and a single weave part 1 is provided outward from both ends 3a and 3b. A partially double knitted woven fabric 4 is prepared. This partially double knitted fabric 4 is cut in the weft direction W at predetermined intervals in the warp direction T as shown by 5 in FIG.
As shown in the figure, the strap material shown in FIG. 1 is obtained by cutting the woven fabric piece on one side (upper side in FIG. 3) of the double line portion 2 approximately at the center (indicated by 6). The positions of fabric pieces A, A', B, C, and C' corresponding to FIG. 3 are shown.

Various types of threads can be used for the airbag strap material. However, the strap material requires high strength, so nylon 66, nylon 6,
It is preferable to use synthetic fibers such as polyester fibers and aramid fibers. The thickness of the thread used is 210d to 1260', usually 840d.

A more preferable weave structure is nylon 66 840d/140.
For example, when using f, the warp density is 27 threads/inch in the double rope section, the weft density is 27 threads/inch in the -heavy weaving section, and the warp density is 5 in the heavy weaving section.
4 threads/inch, and the weft density is 54 threads/inch. Woven fabric piece A,
As mentioned above, the single weave part that constitutes A' and serves as the separation distance defining part when the strap material is attached to the airbag is connected to the respective woven fabric pieces B, C, and C' of the other double rope parts.
The warp density and weft density are twice as high as that of the woven fabric, and therefore a very strong piece of fabric can be obtained.

A method for attaching an air bag to the air bag strap material of the present invention will be explained with reference to FIG. FIG. 4 shows a sectional view of an airbag equipped with the strap material of the present invention as a strap. The airbag 11 shown in FIG. 4 is made by weaving a surface layer cloth 7 and a back layer cloth 8 using a bag weave, and a peripheral portion 9 thereof is formed integrally with the woven structure, and an inflation flake is attached approximately in the center of the back layer cloth 8. The airbag is provided with an opening 10 for attaching an inflator, and is turned over using the opening 10 for attaching an inflator. Woven fabric piece B and woven fabric piece C1C' are attached to approximately the center of the front layer fabric 7 of this airbag 11 by sewing, and woven fabric pieces A and A' are attached to the opening 10 for attaching the inflation flake on the back layer fabric 8 side. Stretch it out towards the periphery of the woven fabric pieces A, A
Attach the end of ' to the periphery of the inflator attachment opening ICI by sewing. When attaching the woven fabric pieces A and A', a reinforcing fabric (not shown) may be used. In the case illustrated in FIG. 4, there are two woven fabric pieces A and A' as the separation distance defining parts, but as shown in the plan view of FIG. 5, the strap material 1
It is also possible to use two pieces of fabric 2 and 13 and arrange them at right angles to make four pieces of woven fabric that serve as the separation distance defining part. Further, the number of strap members may be increased so that the distance between the strap members is six or eight, if necessary.

〔Effect of the invention〕

The airbag strap material according to the present invention is configured to include two sets of three woven fabric pieces connected by a weave structure as described above, so that it can be easily installed when used inside an airbag. This method allows for reliable attachment, and since reinforcing cloth is not used during attachment, or even if it is used, the number of containers used can be reduced, making it possible to create an airbag that is lightweight, flexible, and has good storability. Also, since the woven fabric pieces A and A' that serve as the separation distance defining parts and the woven fabric pieces B, C, and C' that are used for attaching to the surface fabric are connected by the woven structure, the strength of this part is The strength is extremely high compared to attachment by sewing, and there is no risk of the strap material being cut or peeled from the surface fabric at this portion when the airbag is used.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of an air bag strap material according to the present invention, and FIG. 2 is a perspective view showing a partially double line woven fabric for manufacturing the air bag strap material of the present invention. , FIG. 3 shows the process of cutting the double woven fabric shown in FIG. 2 in the weft direction and cutting one of the woven fabric pieces of the double rope part approximately at the center to obtain the strap material shown in FIG. 1. FIG. 4 is a cross-sectional view showing an airbag to which the strap material of the present invention is attached, and FIG. 5 is a cross-sectional view of an airbag using two pieces of the airbag material of the present invention. It is a front view showing an example. A, A'... woven fabric piece serving as a separation distance regulating part, B
, C, C'... Piece of woven fabric used for attaching the surface cloth, 1... - Heavy woven part, 2... Double rope part, 3a,
3b... Border line (end), 4... Partial double line woven fabric, 5, 6... Cutting line (8 places)
, 7...Surface layer cloth, Death...Back layer cloth, 9...
Peripheral part, 10... Opening for inflator attachment, 11... Air bag, 12, 13... Strap shrine. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A strap material for an airbag used to define a separation distance between a surface layer cloth and a back layer cloth of the airbag to a predetermined value when the airbag is inflated, the strap material being used as the separation distance regulating part. the two woven fabric pieces A and A', the woven fabric piece B that connects the two woven fabric pieces A and A', the boundary line 3a between the woven fabric piece A and the woven fabric piece B, and the woven fabric piece B that connects the two woven fabric pieces A and A'; It consists of woven fabric pieces C and C' extending from the boundary line 3b between the woven fabric piece A' and woven fabric piece B, respectively, and three woven fabric pieces A, B, C and woven fabric piece A at the boundary lines 3a and 3b, respectively. ′
, B, and C' are connected by a woven structure.