JPH03292235A - Cylindrical air bag - Google Patents

Abstract

PURPOSE:To deform a cylindrical air bag into a shape to reliably protect a driver during expansion by providing at least beltlike body comprising a bag woven part having a given length and a singlet texture to close the two ends of the bag woven body and regulating a distance between the singlet woven parts at both ends during expansion of the air bag. CONSTITUTION:A bag woven part 2 is woven based on a plurality of warps, and singlet texture parts 3a - 3c are woven at intervals of the bag woven part 2 having a given length to weave a fabric 6 for an air bag. The fabric 6 is cut, as shown by broken lines 7a, 7b, and 7c, approximately at an intermediate position between adjoining singlet texture parts 3a - 3c. Beltlike bodies 4 are arranged in a manner to intercouple the singlet texture parts 3a and 3b, and the both ends of the beltlike body 4 are secured, as shown in 5a and 5b, to the singlet texture parts 3a and 3b by sewing. An inflator mounting port 8 is formed in the other surface of an air bag 1. A so produced air bag 1a is brought into an upside down state through the inflator mounting port 8 to provide a cylindrical air bag.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to airbags. More specifically, the present invention relates to a cylindrical airbag used for a passenger seat or a rear seat.

[Conventional technology]

The use of airbag devices is recommended to prevent personal injury due to automobile collisions. An air bag device consists of a sensor that detects a collision of an automobile, an inflator that generates gas to inflate the bag based on a signal from the sensor, and an air bag that is inflated by the gas and absorbs the impact on the occupant.

The air bags are broadly classified into driver seat air/N bags and passenger seat or rear seat air bags.

The former driver seat air nog is usually installed inside the steering wheel, and is often made in a circular shape. However, unlike the driver's seat, the passenger's position in the front passenger seat or rear seat while riding the vehicle is not fixed and has some degree of left-right movement. Therefore, since a circular airbag cannot sufficiently protect an occupant, a cylindrical airbag is used as an airbag for a passenger seat or a rear seat.

Cylindrical airbags are typically manufactured by sewing fabric. On the other hand, airbags using bag weave are also known.

[Iff to be Solved by the Invention] FIG. 5 shows an example of a conventionally known cylindrical airbag. An airbag 10 shown in FIG. 5 is made by sewing a woven fabric 11 made of synthetic fiber yarn such as nylon 66 multifilament into a cylindrical shape (sewing line 11), and then sewing the fabric 11 into a cylindrical shape (sewing line 11).
It is obtained by fixing the same woven fabric to 2b by sewing (sewing lines 12a, 12b). Although this cylindrical airbag has a shape that can reliably protect an occupant when inflated, it has a problem in that it has many sewn parts. When the airbag is activated, high-pressure gas acts momentarily inside the airbag, so the sewing must be done with special care to avoid leakage of high-pressure gas or rupture of the airbag. Therefore, if there are many sewn parts, the manufacturing cost of the airbag will increase, which is undesirable.

In addition, coating treatment may be applied to reinforce low seam strength, but this increases the cost associated with the coating treatment.

Therefore, it has been proposed to manufacture a cylindrical airbag using hollow weave, as disclosed in Japanese Utility Model Publication No. 51-52108. That is, when weaving the bag weave 16 as shown in FIG. 6(A), this air bag
After a predetermined interval, the single weave portion 17a appears.

17b. In the figure, 18 indicates an inflator attachment port. This airbag has the advantage of being free from gas leakage and rupture because it has no sewn parts, and is also inexpensive. However, when the air bag 15 is inflated, as shown in FIG. 6(B), the ends of the air bag 15 are restrained by the linearly extending single layer parts 17a and 17b, resulting in the ends of the air bag becoming flat. Become. This is airbag 1 shown in Figure 5.
This is due to the fact that there are no end surfaces 12a and 12b formed at zero.

As shown in Figure 6 (B), if an airbag has a flat end when inflated, it will not be possible to reliably fill the space between the occupant and the vehicle body such as a window or dash board when the airbag is activated, resulting in a collision. Occupant protection becomes insufficient.

The present invention solves the problems of conventionally known cylindrical air bags, and provides a passenger seat or rear seat that can be deformed into a shape that can reliably protect an occupant when inflated, and that can be manufactured at low manufacturing cost. The purpose is to provide a cylindrical air six for seats.

[Means to solve the problem]

The object of the present invention is to provide at least one belt-shaped weave, which comprises a bag weave portion having a predetermined length and a single layer weave portion that closes both ends of the bag weave portion, and which regulates the distance between the single layer weave portions at both ends when the airbag is inflated. This is achieved by a cylindrical airbag whose body is connected to the single tissue section at both ends.

The band-like body may be any material as long as it can overcome the force of the high-pressure gas generated when the air bag is inflated to keep the single-ended tissue portions at a predetermined distance by overcoming the force that causes the single-ended tissue portions to be kept at a predetermined distance. It may be. That is, a tape or string made of high-strength fibers such as synthetic fibers can be used, but there is no particular limitation.

The air bag may be coated if necessary, and may be provided with an inflator attachment port necessary for the air bag, and may also be provided with a vent hole for exhausting gas after inflation. Since these structures are not directly related to the characteristic structure of the airbag of the present invention, detailed explanations will be omitted.

〔Example〕

The present invention will be described in detail below with reference to the accompanying drawings showing an example of the cylindrical airbag of the present invention.

FIG. 1 shows a longitudinal sectional view of an example of the cylindrical airbag of the present invention in a state where the airbag is inflated.

In the cylindrical airbag 1 shown in FIG. 1(A), portions indicated by reference numerals 2a, 9a, 2b, and 9b are formed of hollow weave. In FIG. 1(B), the hollow weave portion is collectively indicated by 2. That is, the warp yarns forming the bag weave portion 2 are arranged parallel to the paper surface in FIG. 1(A), and the weft threads are arranged parallel to the paper surface in FIG. 1(B). The portions 3a and 3b shown in FIG. 1(A) are single-layered edges. The bag weave 2 is therefore closed at both ends by a single weave. At least 1 in bag weave part 2
Inflake attachment ports (not shown) are provided. −
A band-shaped body 4 is provided to connect the mold assembly edges 3a and 3b, and therefore the airbag 1 when inflated has a shape similar to that shown in FIG.
), curved end surfaces 9a and 9b are generated, and as a result, the cylindrical airbag of the present invention can be made into an airbag having end surfaces similar to the conventional sewn airbag shown in FIG. can.

Next, a method for manufacturing a cylindrical airbag according to the present invention will be explained with reference to FIGS. 2 to 4.

As shown in FIG. 2, a bag weave section 2 is woven using a plurality of warp yarns lined up in the direction of arrow A, and one-weight edges 3a, 3b, 3c are woven for each bag weave section 2 of a predetermined length. An airbag fabric 6 is woven. Single weave portions 3a, 3 of this woven fabric 6
In steps b and 3c, the single-weight edges 3a, 3b, and 3c are cut at the middle position as shown by broken lines 7a, 7b, and 7c. As shown in FIG.
.

3b is sealed with a single layer of tissue. This-N organization part 3
A strip 4 is arranged so as to connect the strips 3a and 3b, and both ends of the strip 40 are attached to the single weave portions 3a and 3t by sewing or the like.
It is fixed as shown in a and 5b. Furthermore, air bag 1
An inflator attachment port 8 is provided on the other surface. When the air bag la thus obtained is turned over through the inflator attachment port 8, a cylindrical air bag of the present invention shown in FIG. 4 is obtained. As is clear from FIG. 4, since the distance between the single weave portions 3a and 3b on both sides is regulated by the band-like body, the portions 9a and 9b from the single weave portion of the bag weave portion 2 are bent inward in an arc shape (the (see figure 1),
This will form the end face of the cylindrical airbag.

In Fig. 3 (A), the length of the strip 4 is shown to be the same as the length of the bag weave part 2, but in reality, in order to form the end surface, the length of the strip 4 is the same as that of the bag weave part 2. It is necessary to make it shorter than the length.

Next, an example of the cylindrical airbag of the present invention will be shown.

Nylon 66 multifilament 840 d/14
Using 0 f, a bag weave having a warp density and a weft density of 30 pieces/inch was woven in a width of 40 cm (therefore, the circumference of the bag weave part was 80 cm), and single weave parts of 4C1l were formed at 100 cm intervals. The center of the single layer weave of the obtained fabric was cut in the weft direction to obtain a fabric piece. A tape made of nylon 66 multifilament having a length of 3c11 and a length of 80 cm was fixed to the single layer portions on both sides of this fabric piece by sewing. - An inflator attachment opening was provided at the edge of the bag, and the fabric piece was turned over through the inflator attachment opening to obtain a cylindrical airbag. When this airbag was inflated by introducing high-pressure gas, it was found that there was no gas leakage and that the airbag had a cylindrical shape with both end faces, making it suitable for use as an airbag for passenger seats or rear seats. Ta.

In the same way, an inflator attachment hole was provided in the fabric piece before fixing the single-layer tape, and when the airbag was inflated by turning it inside out through this inflator attachment hole, the airbag only became flat at both ends. The airbag did not inflate, making it an impractical airbag.

[Effects of the Invention] Since the cylindrical airbag of the present invention is configured as described above, it can be made into a cylindrical airbag having end faces when inflated. - Since the cylindrical airbag of Rikiki's invention uses no sewing except for the attachment portion of the strip, it is possible to provide an airbag at a low cost without the risk of gas leakage or airbag rupture.

[Brief explanation of the drawing]

FIG. 1(A) is a longitudinal sectional view of an example of the cylindrical airbag of the present invention shown in an inflated state, and FIG. 1(B) is a line 1(B)-1( B) is a cross-sectional view according to FIG. FIG. 2 is a plan view showing a fabric for obtaining a cylindrical airbag according to the present invention, and FIG. 3(A) shows a strip obtained from the fabric shown in FIG. 2 with a strip attached thereto. FIG. 3(B) is a back view of the cylindrical airbag of the present invention showing the inner weave portion provided with an inflator attachment port, and FIG. 4 is a front view of the cylindrical airbag of the present invention. FIG. 5 is a perspective view showing an example of a conventionally known cylindrical air bag made by sewing, and FIG. 6 is a perspective view showing an example of a conventionally known cylindrical air bag made by sewing. FIG. 6A is a diagram showing an example of a conventionally known cylindrical airbag, in which FIG.
FIG. 6(B) is a perspective view showing the inflated state. 1...Airbag (present invention), 2.2a, 2b, 9a, 9b-...Fukuori part, 3a,
3 b + 3 c...-type assembly edge part, 4... band-shaped body, 5a, 5b... connection part of the band-shaped body to the single tissue part,
6... Air bag fabric, 7a, 7b, 7 (-... Cutting line, 8... Inflator mounting port, 10, 15... Air bag (conventional product), 11...
・Woven fabric (for cylindrical part), 12a, 12b-...Woven fabric (for end face), 13.14
a, 14b--Sewing line, 16--Fall weave portion, 172.17b--Type assembly edge portion, 18--Inflator attachment port.

Claims (1)

[Claims] 1. A cylindrical airbag used for a passenger seat or a rear seat, the airbag consisting of a weave part having a predetermined length and a single weave part that closes both ends of the weave part,
A cylindrical airbag, wherein at least one band-shaped body is provided connected to the double-end single-tissue portion for regulating the distance between the double-end single-tissue portion when the airbag is inflated.