Patent ID: 7568725

Claim:
A curtain air bag device for use in a motor vehicle to protect vehicle passengers upon a vehicle collision, comprising: an air bag that, when not in use, is wound up and put in a holding space provided in a side wall part of a passenger room of the vehicle, the air bag having a longitudinally extending upper edge that is to be fixed to the inside side wall part and a longitudinally extending lower edge that is spaced from the longitudinally extending upper edge by a given distance, the longitudinally extending upper and lower edges extending on and along first and second imaginary lines respectively; and an inflator that is installed in the motor vehicle for feeding the air bag with an inflating gas to expand the same upon the vehicle collision, wherein the air bag comprises: a plurality of expandable portions that include a larger expandable portion that has upper and lower edges respectively extending on and along the first and second imaginary lines and a smaller expandable portion that has an upper edge extending on and along the first imaginary line and a lower edge spaced from said second imaginary line by a given distance; and a non-expandable portion having a size-compensating part that extends from the lower edge of the smaller expandable portion to said second imaginary line, and wherein the air bag is constructed of inner and outer base fabrics that are connected to each other to constitute the larger expandable portion, the conduit portion and the smaller expandable portion, and in which one of the inner and outer base fabrics has an extra part that constitutes the non-expandable portion.