| 摘要 |
The lock assembly includes a conventional inner bolt portion movable endwise by either a key or door knob in the usual way. The end of the bolt portion within the door is provided with a ratchet and the other bolt portion is correspondingly ratcheted. The other bolt portion is partially rotatable and includes the locking portion on the distal end thereof situated on the outside of the door. This locking portion is cylindrical and has an inwardly stepped lock plate engaging wall and a developed curve extending from the inner end of the step to the outer perimeter so that as it rolls along a sloping ramp in the keeper plate, the other part of the bolt partially rotates with the step engaging behind the keeper plate and the other bolt portion rotating about the longitudinal axis thereof with the ratchet preventing reverse rotation of the other portion of the bolt until the inner bolt portion is moved endwise by the key or knob thus disengaging the ratchet and allowing the other bolt portion to reverse its rotational movement and roll out of engagement with the lock plate as the door is opened.
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