| 摘要 |
Deadlocking mechanism of the kind including a deadbolt slidably located in a casing so as to be projected beyond an end of that casing in an operative position, and to be substantially contained within the casing in an inoperative position. An actuator such as a key operated pin tumbler lock is operable to cause movement of the deadbolt between its two positions. The invention comprises an improved drive connection between the actuator and deadbolt, which includes a toothed pinion rotatable with the actuator and a rack cooperatively engaged by the pinion and arranged for movement with the deadbolt. That drive connection also includes two gear segments which rotate with the pinion and actuator respectively, and have intermeshing engagement during part only of the pinion movement corresponding to movement of the deadbolt between its operative and inoperative positions. As a result of that interrupted engagement, the lock barrel can be turned independent of the deadbolt to a particular position which is the only rotational position of the barrel at which the operable key can be inserted and withdrawn.
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