Patent ID: 7314233

Claim:
A head-protecting airbag device comprising: an airbag folded and housed in the upper edge of an opening inside the vehicle and deployable downward for covering the opening; and an inflator for supplying inflation gas to the airbag; wherein: the airbag includes an interior wall and an exterior wall, and a gas admissive portion provided between the interior wall and the exterior wall and capable of admitting inflation gas; the gas admissive portion includes: a plurality of cells juxtaposed in the front-rear direction of the vehicle, each of the cells, when fed with inflation gas, extending downward from the upper edge of the opening and inflating while separating the interior wall and exterior wall in the interior-exterior direction of the vehicle; a gas passage extending in the front-rear direction of the vehicle above the cells, the gas passage communicating each of the cells with one another; and a joint port connected with the inflator and located in the gas passage; the airbag includes each one slit between the contiguous cells, each of the slits extending from the lower edge of the airbag to the vicinity of the gas passage; in each of the cells, the interior wall and exterior wall are respectively folded in a bellows fashion on alternate crest folds projecting in the surface and valley folds recessing inside the cell and disposed to provide a first bellows-folded portion in the interior wall, a second bellows-folded portion in the exterior wall, and third folded portions in front and rear edge portions of the cell, whereby the airbag is folded to bring the lower edge thereof close to the upper edge, and is housed in the upper edge of the opening; and the first and second bellows-folded portions are disposed so that the bottoms of valley folds of the first and second bellows-folded portions lead to the tops of crest folds of the third bellows-folded portion, wherein the first and second bellows-folded portions are symmetric in the interior-exterior direction of the vehicle; and each pair of the contiguous cells is joined together by at least one first joint member joining the tops of the crest folds of the third bellows-folded portions at a position above the lower edge of the airbag such that the contiguous cells are not separated in the front-rear direction.