Patent ID: 8240706

Claim:
An airbag arranged on a roof ( 21 ) of a vehicle for protecting an occupant ( 15 ) located under it, the airbag comprising a cushion ( 11 ), a gas generator ( 13 ) which supplies gas to the cushion ( 11 ) when an impact occurs in order to inflate and deploy the cushion in front of the occupant ( 15 ), and an outer cover ( 17 ) including a front portion and a base portion separated by a weakened area ( 45 ) for exit of the cushion ( 11 ), an inner casing ( 23 ) including a fixing area ( 31 ) for fixing the cushion ( 11 ) to a vehicle roof header ( 29 ), an area ( 33 ) for housing the generator ( 13 ) and a diffusion channel ( 35 ) for diffusing the gas into the cushion ( 11 ); wherein a first portion ( 51 ) of the cushion ( 11 ) is disposed along an inner contour of the inner casing ( 23 ) such that the gas is received in an initial area of the diffusion channel ( 35 ), and wherein a second portion ( 53 ) of the cushion is disposed in a folded state in an enclosure ( 57 , 77 ) demarcated by at least a portion of the inner casing ( 23 ), the front portion of the outer cover ( 17 ) and a portion of the vehicle roof header ( 29 ); wherein the weakened area ( 45 ) of the outer cover ( 17 ) is disposed close to an end of the diffusion channel ( 35 ) and wherein the front portion of the outer cover includes hinge means for facilitating deployment of the cushion when the weakened area has broken.