Patent ID: 7637530

Claim:
An air bag device comprising; an inflator for generating gas in emergency situations so as to be expanded and spread out by generated gas, an air bag comprising base cloths having peripheral edges which have been joined together along a seam at said peripheral edges to form a top face side and rear face side thereof, said base cloths being further joined together along a branching line extending from said peripheral edges and defining an opening where said base cloths are not joined, to further form a first air chamber provided with the inflator and a second air chamber that is coupled to the first chamber via the opening, and a partition cloth having a pair of opposed ends, each end joined to a respective one of said base cloths proximate the opening interposed between the first and second air chambers, and having a folded portion disposed toward the second air chamber, said partition cloth forming a partition unit joined to said base cloth on the top face side and rear face side thereof at portions other than the folded side portion of the partition cloth, wherein the partition unit is provided with at least one communication hole which is closed by the partition cloth forming the partition unit owing to a difference in pressure between the first and second air chambers, wherein the first chamber is oriented to extend laterally from an aft to a fore position with respect to a vehicle and the second chamber is disposed above the first chamber and is oriented to extend longitudinally from a lower to an upper position with respect to the vehicle, and wherein an exhaust port is provided in the first air chamber.