| 摘要 |
A winding prevention mechanism for a vehicle occupant restraint belt retractor of the inertia locking type that selectively holds the associated restraint belt unwound for use against the winding bias of the retractor belt reel. The mechanism is actuated to hold the belt unwound when the belt is unwound slightly further than the length required to snugly belt an occupant, allowed to wind back to a snug condition, and then unwound a slight amount less than a limited extent. If the belt is unwound more than the limited extent, the mechanism permits belt winding reel rotation that stores the belt within the retractor. A leaf spring type pawl is mounted on the retractor housing and normally biased into engagement with a ratchet wheel carried by the retractor belt reel so as to provide the actuated mechanism condition holding the belt unwound. A blocking disk is frictionally clutched to the belt reel so as to move between a blocking position preventing this engagement and a non-blocking position where the engagement is allowed. A control disk also frictionally clutched to the belt reel has a control portion that moves the pawl out of engagement with the ratchet wheel so as to allow the blocking disk to move to the blocking position in a manner that provides the sequenced operation of the retractor.
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