Impact absorbing air bag and method for manufacturing same
First Claim
Patent Images
1. An air bag comprising:
- a seamless woven fabric having a central zone of substantially circular shape and formed by a non-connected portion (B2) of a tubular weave structure (B) to provide front and back layers in the central zone, and a circumferential zone of ring-like shape and formed by a connected portion (B1) of the tubular weave structure (B) and a non-tubular weave structure (A), wherein the transition between the non-tubular weave structure (A) and the tubular weave structure (B) is continuous;
at least one side of said non-connected tubular woven fabric being provided with a polymer covering layer (2); and
a gas introducing hole (3) in the non-connecting portion (B2) of the tubular weave structure (B) in one of the front and back layers of the central zone.
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Abstract
This invention relates to an impact absorbing bag for an automobile, that is, an air bag, consisting of seamless tubular woven fabric (1) which comprises a connecting portion (B1) formed around a non-connecting portion (B2), is at least partially covered with a polymer covering layer (2) on the surface thereof and has a gas introducing hole (3) on one of its surfaces. The seamless tubular woven fabric (1) can be prepared by cutting circularly a woven fabric having the non-connecting portion (B2) formed in succession. The bag may be turned inside out so that its inside and outside are reversed.
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Citations
8 Claims
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1. An air bag comprising:
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a seamless woven fabric having a central zone of substantially circular shape and formed by a non-connected portion (B2) of a tubular weave structure (B) to provide front and back layers in the central zone, and a circumferential zone of ring-like shape and formed by a connected portion (B1) of the tubular weave structure (B) and a non-tubular weave structure (A), wherein the transition between the non-tubular weave structure (A) and the tubular weave structure (B) is continuous; at least one side of said non-connected tubular woven fabric being provided with a polymer covering layer (2); and a gas introducing hole (3) in the non-connecting portion (B2) of the tubular weave structure (B) in one of the front and back layers of the central zone. - View Dependent Claims (2, 3, 4)
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5. A method for manufacturing an air bag, comprising the steps of:
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forming a continuous seamless tubular woven fabric having connected portions and non-connected portions by repeating a tubular weave weft picking operation to progressively weave a weft thread with a plurality of warp threads in a manner so that as the weft picking operation is repeated, the pick length in the connected portion (B1) is varied inversely as the pick length in the non-connected portion to provide at least one non-connected portion (B2) with a substantially circular shape; forming a polymer layer on at least one side surface of the formed fabric; cutting the connected portions of the formed fabric in a circular shape to provide a seamless tubular woven fabric having a central zone of substantially circular shape and formed by and a circumferential zone of ring-like shape and formed by a connected portion (B1) of the tubular woven fabric; and providing a gas introducing hole in said non-connected portion (B2) of at one side of said seamless tubular woven fabric. - View Dependent Claims (6)
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7. An air bag comprising:
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a non-connected, double layer, inflatable tubular woven fabric portion of substantially circular configuration and defining a central zone; a non-inflatable fabric portion of ring-like configuration peripherally joining the double layers of the central zone, at least a part of said non-inflatable fabric portion of ring-like configuration including non-tubular woven fabric; both said fabric portions being defined by common interwoven warp and weft threads as a seamless, continuously woven fabric; a passage formed in said central zone for introducing a gas into the bag to inflate the bag; and a polymer covering layer on at least one side of said non-connected, double layer, inflatable tubular woven fabric.
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8. An air bag comprising:
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a non-connected, double layer, inflatable tubular woven fabric portion of substantially circular configuration and defining a central zone; a non-inflatable fabric portion of ring-like configuration peripherally joining the double layers of the central zone; both said fabric portions being defined by common interwoven warp and weft threads as a seamless, continuously woven fabric; a passage formed in said central zone for introducing a gas into the bag to inflate the bag; and a polymer covering layer on at least one side of said non-connected, double layer, tubular woven fabric.
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Specification