| 摘要 |
PURPOSE:To reduce explosion sound of a propulsion agent by disposing a driving device for applying tractive force to a seat belt by expansion force produced by combustion of the agent when designated deceleration is caused inside a seat bearing surface, and utilizing a cushion material of the seat bearing surface as sound absorbing material. CONSTITUTION:A preloader disposed on the inside lower portion of a seat 1 of a vehicle incorporates a retractor having an emergency lock device. Further, there are provided a deceleration sensor 8 adapted to discriminate only impulsive deceleration due to a collision according to displacement of an inertia weight supported in a floating manner and a driving device 9 incorporating a propulsion agent 16. When the agent 16 is ignited in response to a signal of the deceleration sensor 8, the driving device 9 displaces a piston 12 by its expansion force, so that a wire 14 is pulled to roll in a seat belt 3. In this case, the driving device 9 is constructed so that a seat cushion 17 which is disposed inside a bearing surface S of a seat 1 and formed by foaming urethane is utilized as a sound absorbing material. |
