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    Belt retractor and locking mechanism
    2.
    发明授权
    Belt retractor and locking mechanism 失效
    带扣延伸器和锁定机构

    公开(公告)号：US3692253A

    公开(公告)日：1972-09-19

    申请号：US3692253D

    申请日：1965-06-21

    申请人： BORG WARNER

    发明人： CURRAN ROBERT J

    IPC分类号： B60R22/347 ,  B60R22/353 ,  A62B35/00

    CPC分类号： B60R22/353 ,  B60R2022/3475

    摘要： A belt retracting apparatus includes a spring-motivated reel and a jaw clamp for gripping the belt. One portion of the jaw clamp is a freely rockable locking lever about which a portion of the belt is trained such that the tension exerted by the reel rocks the lever to unlock the clamp releasing the belt for retraction, and a greater tension rocks the lever in the opposite direction to lock the clamp gripping the belt to prevent extraction. A latch is provided for disabling the automatic gripping action during an initial extraction of the belt but once belt tension is relaxed, further extraction is prevented until the latch is reset by retracting a predetermined portion of belt. The latch may be reset by a double thickness of belt or by the number of convolutions on the reel. The other portion of the jaw clamp is a resilient bowed beam which deflects under load to increase the gripping area and also to change the effective lever arm ratio of the locking lever. Thus, the belt is protected against destructive gripping forces under extremes of belt tension by changing the leverage ratio of the locking lever and increasing the area of gripping contact.