Patent ID: 7654560
Filing Date: 2010-02-02
Classification: B60R

Abstract:
1. An air bag to be folded in a vertical direction of a vehicle and accommodated in an upper part of a vehicle body so as to unfold from the upper part downwardly when developed by impact, the air bag comprising, in its unfolded condition: an airbag body including an outside foundation cloth close to an exterior of the vehicle and an inside foundation cloth close to an interior of the vehicle, the outside and inside foundation cloths having respective peripheries joined to each other through a peripheral junction thereby forming a pouched body; and a pair of interior foundation cloths arranged in the airbag body and consisting of an outside inner-cloth positioned close to the outside foundation cloth and an inside inner-cloth positioned close to the inside foundation cloth, the outside inner-cloth being intermittently joined to the inside inner-cloth through at least two inner junctions separated from each other in a fore-and-aft direction of the vehicle to extend up and down with respect to the fore-and-aft direction of the vehicle, wherein the outside inner-cloth has a front end thereof, a rear end and an intermediate portion between the inner junctions, all of the front end, the rear end and the intermediate portion are joined to the outside foundation cloth through overlapping junctions extending up and down with respect to the fore-and-aft direction of the vehicle; the inside inner-cloth has a front end thereof, a rear end and an intermediate portion between the inner junctions, all of the front end, the rear end and the intermediate portion are joined to the inside foundation cloth through overlapping junctions extending up and down with respect to the fore-and-aft direction of the vehicle; and the overlapping junctions of the outside inner-cloth are shifted from the overlapping junctions of the inside inner-cloth on either forward or rearward in the fore-and-aft direction of the vehicle, thereby a plurality of tubular expansion chambers are defined in the airbag body to extend up and down with respect to the fore-and-aft direction of the vehicle.