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EP0486697A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Air bag made of hollow weave fabric

Assignee: Asahi Kasei Corp
•
Filing: 1991-06-07
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Granted: —
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Expires: 2011-06-07
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Abstract

Abstract An air bag made of hollow weave fabric, in which the boundary line (7) between the hollow part (6) of the bag and the peripheral part (4) of the stitched flat woven fabric corresponds to a curvilinear locus drawn when a certain point defined by a equation, L = R (1 + P/2 x cos 4Θ), is displaced with a change in Θ, wherein L is a length between the center (C) of the hollow part (6) and the boundary line (6), Θ is an angle (radian) between the warpwise axis of the fabric and a straight line passing through a certain point (A) on the boundary line and the center (C) of the hollow part (6), R is a mean value of radii of the circumcircle and the inscribed circle, P is a ratio of a difference between the radii of the circumcircle and the inscribed circle to the mean value R, and 0 < P ≦ 0.2. This invention ensures an air bag made of hollow weave fabric having the outer periphery not sewn at all, an extremely high pressure resistance, and a high reliability.

Inventors

  • 👤 Kunihiko Fukumori
  • 👤 Masaharu Yasue

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 09:08
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/23; B60R21/235

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 216 words
A hollow weave air bag having a peripheral portion of a hollow portion which is bound by a single layer weave binding band, characterized in that a boundary line between the peripheral portion and the single layer weave binding band is formed with different lengths from a center of the hollow portion to the boundary line in such a manner that the length has a maximum value in a warp direction and a weft direction of the hollow weave air bag and a minimum value in a bias direction thereof, and is further formed substantially along an arc-like continuous curve expressed by the following equation between a circumscribed circle and an inscribed circle of the boundary line: L = R (1 + P/2 × cos 4ϑ)   (1) O < P ≦ 0.2   (2) wherein R stands for a mean value of a radius of the circumscribed circle and a radius of the inscribed circle; P stands for a ratio of a difference between the radius of the circumscribed circle and the radius of the inscribed circle against the mean radius R; ϑ stands for an angle measured in a clockwise direction from the warp direction; L stands for a length from the center C of the hollow portion to the boundary line at the angle ϑ
Claim 2
Dependent Claim 67 words
A hollow weave air bag according to claim 1, characterized in that lengths of straight lines within said boundary line in plan view extending through a center of the hollow portion of said air bag are substantially equal to each other in a warp direction, in a weft direction and in two bias directions, when said air bag is expanded at an internal pressure of 0.3 kgf/cm².
Claim 3
Dependent Claim 29 words
A hollow weave air bag according to claim 1, characterized in that an opening for attaching a gas generator is arranged in the hollow portion of said air bag.
Claim 4
Dependent Claim 25 words
A hollow weave air bag according to claim 1, characterized in that a resin layer is provided on at least part of said air bag.
Claim 5
Dependent Claim 29 words
A hollow weave air bag according to claim 1, characterized in that at least a part of said single layer weave binding band is formed by a matt weave.
Claim 6
Dependent Claim 73 words
A hollow weave air bag according to claim 5, characterized in that a weave of an area adjacent to the boundary line in the single layer weave binding band is a matt weave, and an area outside of said area formed by the matt weave is formed by a weave in which a warp and a weft is constituted by a weave having a lower restriction compared with that of the matt weave.

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