Patent ID: 8573691

Claim:
A vehicle seat comprising: a seat bottom; a seat back mounted rotatably to the seat bottom; said seat bottom including a support frame to be mounted to a vehicle body and a bottom cushion supported by the support frame, the support frame comprising two vertical plates and a coupling member connected between the two vertical plates, each of the two vertical plates having defined therein at least one slot extending lengthwise in a front to back direction, at least one mounting shaft directly connected to each of two opposite sides of the bottom cushion, wherein the mounting shaft on each side extends outwardly and is movably supported in the at least one slot of each of the two vertical plates; said support frame having a configuration not to move in a front-and-back direction with respect to the vehicle body by unfavorable external force that abruptly moves a seat occupant forward; said bottom cushion having a configuration to be movable in the longitudinal direction with respect to the support frame; a pretensioner disposed between the bottom cushion and the support frame for moving the bottom cushion backward with respect to the support frame when the unfavorable external force is generated; and a seat belt mechanism comprising a seat belt, a tongue plate coupled to the middle of the seat belt, a tongue anchor with which the tongue plate is removably engaged, and a tip anchor to which the head end of the seat belt is fixed, and wherein the tongue anchor and the tip anchor are directly connected to an outer end of the at least one mounting shaft on each side, respectively, so that the tongue anchor and the tip anchor move backward together with the bottom cushion responsive to the pretensioner.