Patent ID: 7322600
Filing Date: 2008-01-29
Classification: B60R

Abstract:
1. A head-protecting airbag folded and housed in upper edges of side windows and deployable downwardly when fed with inflation gas, the airbag comprising: an airbag body for covering the side windows upon deployment and a belt, the airbag body including a gas admissive portion and a non-admissive portion which admits no inflation gas, wherein; the non-admissive portion includes a peripheral portion located in an outer edge of the airbag to encircle the gas admissive portion; the gas admissive portion inflates by admitting inflation gas between an airbag's inner wall and an airbag's outer wall; the gas admissive portion includes an initially inflatable portion located along an upper edge of the airbag body and admitting inflation gas in the initial stage of inflation, and a protective portion located below the initially inflatable portion and to be disposed at a side of an occupant's head as the airbag is completely inflated; the protective portion includes a main cell having a temporary joint; the temporary joint joins the inner wall and the outer wall together, and separates the inner wall and the outer wall when internal pressure of the protective portion rises along with inflation after the airbag is completely unfolded, the temporary joint includes a vertical portion disposed substantially along the vertical direction; a lower end of the vertical portion ends halfway down an area of the protective portion such that the vertical portion is not connected with the peripheral portion at a lower edge of the airbag; separation of the temporary joint proceeds from the lower end thereof to an upper end thereof whereby the main cell is inflated thinly before the separation of the inner wall and outer wall by the temporary joint, and inflated thickly after the separation; the belt is located in an exterior side of the airbag body, an upper end of the belt being connected to the vicinity of an upper edge of the airbag body, and a lower end of the belt being connected to a position below the initially inflatable portion of the airbag body, whereby the belt pulls a lower part of the airbag body toward an exterior of a vehicle during deployment; and the airbag body is provided: in at least part of the initially inflatable portion, with a folded and piled portion formed by folding and piling the inner wall and outer wall on folds together with the belt; and, below the folded and piled portion, with a roll-folded portion rolled toward the exterior of the vehicle from a lower edge side, whereby the initially inflatable portion pushes out the protective portion downwardly when inflated with inflation gas.