| 摘要 |
An automatic locking safety belt retractor includes a belt take-up reel spring biased to rotate in a belt retraction direction and having affixed to its ends a pair of ratchet wheels. Normally retracted pawls are independently advanceable into ratchet wheel engage positions and a sensing mechanism concurrently advances the pawls. There is a phase difference between the relationships of each pawl with a respective ratchet wheel so that with advance of the pawls in the event that one coincides with the tip of a ratchet wheel tooth the other pawl engages the ratchet wheel between successive teeth. In one form the ratchet wheels are similar and have the same number of teeth but are relatively angularly displaced one-half of a tooth pitch and in another form the ratchet wheels have different numbers of teeth. The sensing mechanism includes a pendulum which, upon swinging, raises a cross piece eccentrically coupled at its ends to the pawls to advance the pawls. The cross bar may be coupled to the sensing mechanism at a point intermediate the ends of the cross bar or at a point offset therefrom. |
