Patent ID: 7458606

Claim:
An inflatable curtain air-bag comprising two super-imposed layers of air-bag fabric which define between them a plurality of inflatable regions, a gas supply duct extending into the air-bag and including a side extending along one edge of the air-bag, the gas supply duct being of elongate tubular form and defining a longitudinal axis and being formed of a single layer of duct fabric having intersecting warp and weft yarns, the gas supply duct being provided with a plurality of apertures formed through the duct fabric through which a gas may flow into the inflatable regions of the air-bag, the apertures forming a first configuration defining a first area surrounded by a plurality of cut warp and weft yarns, wherein upon inflation of the air-bag, the apertures deform to a second configuration defining a second area substantially larger than the first area, the warp and weft yarns of the duct fabric being inclined at an angle of between 30° and 60° to the longitudinal axis of the gas supply duct so that when the air-bag inflates the apertures deform to the second configuration, wherein the inclined warp and weft yarns reduce the likelihood of the fabric tearing during inflation of the air-bag, wherein the single layer of duct fabric is folded so that opposed edges of the duct fabric are super-imposed and positioned between the super-imposed layers of the air-bag fabric, the super-imposed edges of duct fabric being secured together by stitching extending in the direction of the longitudinal axis.