Patent ID: 7823915

Claim:
An occupant restraining device for a vehicle comprising: a vehicle seat; a base frame of the vehicle seat having left and right side frames each extending in a forc-and-aft direction in the vehicle; springs that extend laterally between rear portions of the side frames; a seat pan that extends laterally to bridge forward portions of the side frames to be connected thereto without springs therebelow; a seat cushion having a forward portion supported on the seat pan and a rearward portion supported on the springs so that the seat cushion rearward portion moves downward with the springs when an occupant sits on the seat cushion; a bag disposed between the seat cushion forward portion and the seat pan, the bag being supported only on the seat pan and extending laterally in a left-right width direction of the vehicle seat, the bag being inflatable for pushing the seat cushion forward portion upwardly from below; and a gas generator that inflates the bag when a vehicle is in an emergency situation, wherein the bag extends in a left-right direction of the seat pan, wherein stationary sections provided at left and right ends of the bag are fastened to the seat pan spaced from the side frames, wherein the bag has a gas chamber that is disposed between the stationary sections and is inflated when gas is introduced into the gas chamber, and wherein, in a flat unfolded state where the bag is not inflated and is flatly unfolded, a distance between the stationary sections is defined as L 1 and a maximum length of the gas chamber in the left-right direction is defined as L 2 , a value of L 2 /L 1 is within a range of 0.6 to 0.9, and the gas chamber has a maximum width extending thereacross orthogonal to the maximum length thereof such that the distance between the stationary sections is generally less than twice the maximum width of the gas chamber.