| 摘要 |
An end of a seat belt is connected to a part of the vehicle body via an actuator that can selectively remove a slack from the seat belt. The actuator includes a mass member attached to said moveable end of said seat belt, a main actuator unit adapted to move said mass member in a direction to remove a slack from said seat belt immediately upon detection of a frontal vehicle crash, and a cushioning member for decelerating a movement of said mass member following a certain initial travel of said mass member. The main actuator produces an early rise in the vehicle occupant deceleration, and the cushioning member smoothly connects the time history of the vehicle occupant deceleration to a ride-down condition whereby the deceleration acting on the vehicle occupant is favorably spread over time, and the maximum level of the deceleration can be minimized. The mass member contributes to a favorable shaping of the time history of the vehicle occupant deceleration.
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