Patent ID: 6869099

Claim:
An air bag apparatus for a vehicle, comprising: an inflator arranged in a vehicle body to generate air-bag gas at a vehicle collision; an air bag body connected with the inflator, the air bag body having a plurality of chambers juxtaposed in a fore-and-aft direction of the vehicle, the air bag body being folded and accommodated in a space defined between an interior side face of a roof-side rail forming the vehicle body and a trim for covering the interior side face of the roof-side rail; and a preventive mechanism for preventing the air bag body from being incompletely inflated at a specified chamber of the chambers the specified chamber being arranged corresponding to a center pillar forming the vehicle body, the preventive mechanism configured to reduce an expansion thickness of the specific chamber in a vicinity of an upper end of a center pillar garnish, the preventive mechanism configured to be broken when an inner pressure in the specific chamber reaches a normal inflating pressure, thereby accomplishing a normal expansion thickness of the specific chamber, whereby, at the vehicle collision, the air bag body can be completely inflated by the air-bag gas downwardly from the space while springing an lower end of the trim backwardly.