JPH03292237A - Air bag with cylindrical strap - Google Patents

Abstract

PURPOSE:To produce a high-reliable expansion suppressing effect in a way that a strap forms a reticulate cylinder body by locating a strap for suppressing a separation distance between a cloth on the human body side and a cloth on the car body side, in an air bag with a cylindrical strap. CONSTITUTION:An air bag 10 with a cylindrical strap for a driver seat comprises a cloth 11 on the human body side and a cloth 12 on the car body side, and a circular inflator mounting port 15 is formed in the central part of the cloth 12 on the car body side. A peripheral edge part 14 is formed in a way that after the peripheral parts of the sloths 11 and 12 are overlapped with each other, the overlapped part is sewn in a plurality of rows by using a sewing thread 13. In this case, the peripheral edge part is a circular-knitted fabric knitted by braiding by using a synthetic fibre multifilament to form a reticulate cylinder body 2. A plurality of cloth pieces 5a and 5b formed by longitudinally forming a plurality of cuts 4a and 4b in the both ends of the reticulate cylinder body 2 are folded. The cloth pieces 5a and 5b are sewn to the cloths 11 and 12 by means of sewing threads 17 and 18, respectively, to complete an air bag.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an airbag with a strap.

[Conventional technology]

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

A conventionally known airbag is formed into a bag shape using a fabric made of multifilament synthetic fibers such as nylon 66, and an inflator attachment port is provided in the fabric on the side of the vehicle body. A strap is provided inside these airbags to connect the fabric on the human body side and the fabric on the vehicle body side. If this strap is not provided, the airbag will expand into a spherical shape when inflated.
It becomes impossible to achieve sufficient protection for the occupants. In conventional straps, multiple tapes, for example, six tapes having a certain length, are attached at both ends by sewing to the outside of the inflator attachment openings of the fabric on the human body side and the fabric on the vehicle body side inside the airbag, so that when the airbag is inflated, The separation distance between the fabric on the human body side and the fabric on the vehicle body side is suppressed so that the human body can be sufficiently protected when inflated.

[Problem to be solved by the invention]

However, since the airbag is instantaneously inflated by high-pressure gas, extremely strong tension is applied to the tape-like strap, which may cause the strap itself or the connection portion of the strap to the fabric on the human body or the fabric on the vehicle body to break. Further, the force applied to multiple tapes may not be uniform. For this purpose, it is necessary to use a sufficiently strong tape, and to make sure that the distance between each tape is uniform so that a strong bonding force can be applied through careful sewing. This is undesirable because it increases the cost of attaching the straps and makes the resulting airbag heavy and stiff, reducing its storage performance.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of conventionally known airbags with straps and to provide an airbag with straps that is highly reliable and advantageous in terms of cost.

[Means to solve the problem]

An object of the present invention is to comprise a vehicle body side fabric having a human body side fabric and a peripheral portion integrally joined to the peripheral portion of the human body side fabric,
An airbag with a strap, wherein the vehicle body side fabric is provided with an inflator attachment port, and a separation distance suppressing strap is provided between the human body side fabric and the vehicle body side fabric, the strap having one end attached to the human body side fabric, This is achieved by an airbag with a cylindrical strap, which is characterized by being a net-like cylindrical body whose other end is joined to the outside of the inflator attachment port of the fabric on the vehicle body side.

A cylindrical knitted fabric or a silk fabric can be used as the net-like cylinder. Alternatively, a cylinder body made of a hollow weave or a fabric sewn into a cylinder shape may be provided with a plurality of slits on the surface thereof.

〔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 airbag with a cylindrical strap according to the present invention.

Note that the following description will be made using, as an example, an airbag for a driver seat having a substantially circular outer shape.

However, the structure of the airbag with cylindrical strap of the present invention is suitable for use with passenger or rear seat airbags having other shapes.
In this case, it is also applicable to cases where two or more inflator attachment ports are used.

FIG. 1 shows a sectional view of an airbag 10 with a cylindrical strap when used for a driver seat according to the present invention, with the airbag inflated. The airbag IO shown in FIG. 1 consists of a human body side fabric 11 and a vehicle body side fabric 12, and a circular inflator attachment port 15 is provided in the center of the vehicle body side fabric 12.

Although the human body side fabric 11 and the vehicle body side fabric 12 are shown as a single sheet in the drawing, they are usually woven fabrics made of nylon 66 multifilament or the like and are coated on the entire surface or in part for reinforcement and gas leak prevention. A vent hole is provided for exhausting the gas after expansion, if necessary.

Since these structures are not directly related to the structure of the airbag with a cylindrical strap of the present invention, a detailed explanation will be omitted.

The peripheral edge 14 is formed by overlapping the respective peripheral portions of the human body side fabric 11 and the vehicle body side fabric 12 and sewing several rows with the sewing thread 13. In order to increase the bonding strength of the peripheral edge 14, the seam allowances of the human body side fabric 11 and the vehicle body side fabric 12 at the peripheral edge 14 may be bonded using an adhesive. By turning the bag-shaped airbag in this way through the inflator opening 15, the peripheral edge 14 can be placed inside the airbag 10, as shown in FIG. In addition, inflator installation port 15
A plurality of reinforcing cloths 16 are fixed to the outer circumference by sewing.

In the airbag 10 with a cylindrical strap of the present invention, the cylindrical strap shown by 1 in FIG. It is fixed by sewing.

An example of a net-like cylinder is shown in FIGS. 2 and 3. Second
The net-like cylindrical body 2 shown in the figure is a silk fabric knitted with a net structure using synthetic fiber multifilaments. Since it is a nine-knit fabric with a net structure, gas generated from the inflator can pass through the holes 6, and there is no problem with the inflation of the air bag 10. A plurality of cuts 4a, 4b are made in the longitudinal axis direction at both ends of the net-like cylinder 20, and the resulting plurality of fabric pieces 5a, 5b are folded as shown in FIG. The airbag with a cylindrical strap of the present invention is obtained by sewing the fabric to the human body side fabric 11 and the vehicle body side fabric 12 with sewing threads 17 and 18.

The net-like cylindrical body 3 shown in FIG. 3 is woven in a hollow weave using synthetic fiber multifilament, and has a number of circumferential slits 7 on its side surface. The slit 7 may simply be a cut. When the airbag 10 is inflated, the gas passes through these many slits 7 and enters the airbag IO. A plurality of cuts 4a, 4b are also made in the longitudinal axis direction on both ends of the net-like cylinder 3, and the fabric pieces 5a, 5b obtained are used to form the human body side fabric 11 and the vehicle body side of the airbag 10. It may be attached to the fabric 12 by sewing.

The structure of the net-like cylinder, i.e., the thickness of the yarn used, the weaving, knitting, the density of the net, etc., the size and number of the holes 6 and slits 7, and the strength of the net-like cylinder in the longitudinal direction and the gas It may be determined by experiment, taking into consideration the passability of .

In the airbag with a cylindrical strap of the present invention, since the cylindrical strap is used, the tensile force applied to the strap due to the expanding gas pressure can be uniformly borne by the entire cylindrical body. Therefore, compared to conventionally known airbags that use a plurality of tapes, greater strength can be achieved with a smaller amount of yarn used. This makes it possible to reduce the weight of the obtained airbag and to increase its storability due to its high flexibility.

An example of a method of fixing the net-like cylindrical body l will be explained based on FIG. 4. As mentioned above, in order to make the bag body of the airbag 10 shown in FIG. 1, the human body side fabric 11 and the vehicle body side fabric 12 are
are overlapped and the peripheral portion is sewn (sewing thread 13) to form a peripheral edge 14, thereby producing a bag body 10a with the peripheral edge 14 on the outside as shown in FIG. In this state, the fabric piece 5a at the end of the net-like cylinder 1 is sewn to the human body side fabric 11 (sewing thread 18).
Fixed by

The bag 1a with a net-like cylinder body thus obtained is turned over through the inflator attachment port 15, and the fabric piece 5b of the net-like cylinder body 1 is attached to the outer periphery of the inflator attachment port 15 of the vehicle body side fabric 12 together with the reinforcing cloth 16. If the airbag is fixed by sewing (sewing thread 17), an airbag with a cylindrical strap according to the present invention shown in FIG. 1 can be obtained.

As is clear from the explanation based on FIGS. 1 and 4,
In the airbag with a cylindrical strap of the present invention, the net-like cylindrical body can be attached by sewing as shown in the figure, by gluing, or by a combination of sewing and gluing. Also, the net-like cylinder is the human body side fabric 1.
1 and the vehicle body side fabric 12 are ring-shaped, and since it is only necessary to fix one net-like cylinder, compared to the conventional case where multiple tapes are used as a strap. , it is easy to fix the net-like cylinder. This helps reduce costs associated with fixed work.

〔Effect of the invention〕

Since the airbag with a cylindrical strap of the present invention is configured as described above, it can uniformly suppress the expansion of the airbag and has a strap with high strength, so that highly reliable suppression of fat expansion can be achieved. Can be done. Furthermore, since the structure and fixing method of the strap are simple, it helps to reduce costs, and the airbag is light and highly flexible, and therefore has improved storage performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the near bag with a cylindrical strap according to the present invention in an inflated state, and FIG. FIG. 3 is a perspective view showing another example of the net-like cylinder; FIG.
FIG. 4 is a sectional view showing the bag at an intermediate step for obtaining the airbag with a cylindrical strap shown in FIG. 1. 1.2.3... Net-like cylinder, 4a, 4b... Notch, 5a, 5b... Fabric piece,
6...hole, 7...slit, 10
...Air bag, 10a...Bag body, 11...
・Human body side fabric, 12... Vehicle body side fabric, 13,
17, 18... Sewing thread, 14... Peripheral edge, 1
5...Inflator installation port, 16...Reinforcement cloth.

Claims (1)

[Claims] 1. Consisting of a human body side fabric and a vehicle body side fabric having a peripheral edge integrally joined to the periphery of the human body side fabric, an inflator attachment opening is provided in the vehicle body side fabric, and between the human body side fabric and the vehicle body side fabric In the airbag with a strap, the strap is provided with a separation distance restraining strap, and the strap is a net-like cylinder with one end connected to the fabric on the human body side and the other end connected to the outside of the inflator attachment port of the fabric on the vehicle body side. An airbag with a cylindrical strap featuring