Land vehicles – Wheeled – Attachment
Patent
1992-01-30
1993-05-25
Tyson, Karin L.
Land vehicles
Wheeled
Attachment
383 3, B60R 2116
Patent
active
052133630
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to an air bag. More specifically, the invention relates to a hollow weave air bag for protecting passengers of an automotive vehicle and having a high reliability and a high withstanding pressure.
2. Prior Art
In recent years, air bag systems devices for protecting passengers to prevent the human body from injury caused by collisions, etc., of the automotive vehicle, have been put to actual use and installed in vehicles.
The air bag system comprises a sensor for detecting a collision of the vehicles, a gas generator (inflator) for expanding the bag in response to a signal from the sensor, and an air bag expanded with gas for absorbing any shock imposed on the passenger at the collision.
Accordingly, the air bag has a hollow portion for receiving the gas, an opening for attaching the gas generator, and mechanism for ventilating the gas from the air bag after expansion (for example, a vent hole, or alternatively, it is possible to use the permeability of a fabric of the air bag). Note, to restrict the permeability of the fabric of the air bag and for a reinforcement of the stitched portions, a coating may be provided on the fabric of the air bag.
Such an air bag is formed by initially preparing a woven fabric by employing a high strength synthetic fiber, such as a conventional nylon 66 multifilament and so forth, in the case of the driver's seat, cutting two pieces of woven fabric, sewing the peripheral portions of the two pieces of woven fabric to bind them to each other, and subsequently, providing the opening for attaching the gas generator and the gas ventilating mechanism. It should be noted that, before the sewing, a coating is typically provided on the woven fabric pieces.
It is required that the air bag is able to be expanded by a gas, upon a collision, and to absorb any shock imposed on the passenger during the collision. Accordingly, a high withstanding pressure and a high reliability are required.
Japanese Examined Utility Model Publication (Kokoku) No. 54-3484 disclosed a sewn type air bag in which two circular woven fabric pieces are piled one on the other in such a manner that the warps of the two pieces cross each other at an angle of between 40.degree. and 50.degree., and the peripheral edges of the two pieces are sewn to improve a withstanding pressure thereof.
Further, Japanese Unexamined Utility Model Publication (Kokai) No. 2-90170 filed on Dec. 28, 1988 and published on Jul. 17, 1990, which is later than the filing date, i.e., Jun. 8, 1990, of Japanese Patent Publication No. 2-148502 from which the present invention claims priority, disclosed a sewn type air bag in which two woven fabric pieces of a square-like shape and having round corners, in which a length between a center of piece and a peripheral portion is longest in a direction inclined from a warp direction and a weft direction of between 40.degree. and 50.degree. are piled, and peripheral portions of the two pieces are bound by sewing or an adhesive to improve the withstanding pressure thereof.
Nevertheless, the conventional known air bags, including the above-mentioned air bags manufactured by binding by sewing or an adhesive, have disadvantages such as a durability of the sewing thread, air leakages due to damage to the woven fabric caused by a sewing needle, and an irregularity of the sewn seam or the like. Further when the binding is applied by using an adhesive, a bound portion thereof becomes extremely hard, and thus problems such as a poor folding property (a poor property hindering the making of the air bag compact), a lower reliability of the binding caused by an irregularity of the adhesive strength or the like, arise. Further, these air bag have another problem of an increased cost brought about by complicated sewing operations or adhesive operations or the like.
Japanese Unexamined Patent Publication (kokai) No. 1-254446 proposed a hollow weave air bag manufactured by binding a peripheral portion by a single layer weave binding band, to solve problems of air bag
REFERENCES:
patent: 408858 (1889-08-01), Seymour
patent: 928642 (1909-07-01), Elliott
patent: 3991249 (1976-11-01), Yamashita
patent: 5011183 (1991-04-01), Thornton et al.
Fukumori Kunihiko
Yasue Masaharu
Asahi Kasei Kogyo Kabushiki Kaisha
Tyson Karin L.
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