Folding and accommodation of an airbag in an air bag device

摘要

An air bag wherein a peripheral wall portion on one side opposite to an opening for introducing an inflation gas is put on the side of a peripheral wall portion having the opening in such a manner as to set flatly developed peripheral edges closer to the opening side before being folded twice whereby to house the air bag in a casing. The peripheral wall portion on the side opposite to the opening is put on the side of the peripheral wall portion having the opening and flatly developed. The peripheral edges in three directions around the opening are folded together closer to the opening side at the first stage. Peripheral edges on the end portion side thus folded in the three directions around the opening are folded at the second stage in such a manner as to set the peripheral edges closer to the opening side whereby to house the air bag in the casing. The region of the air bag cover which is positioned above and substantially closer to the center of the air bag thus folded up is thick-walled so that the region thereof may protrude downward from the periphery of the air bag.