| 摘要 |
A spring-loaded safety belt for automobiles, and the like, has a rotatable shaft for winding up the belt, and a rotatable inertia disc which effects locking of the shaft whenever the shaft and disc are rotated relative to one another. A pendulum-type member is suspended adjacent the disc to be swung in any direction about a vertical axis only when the acceleration or deceleration of the associated vehicle in any direction exceeds a predetermined value - e.g., 0.3g (gravity). Whenever the pendulum member is swung, and regardless of the direction, it pivots a hook member which engages a tooth on the inertia member to hold the latter motionless during withdrawal of the belt and rotation of the wind-up shaft thereby triggering the locking mechanism to halt further unwinding of the belt.
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