| 摘要 |
A lock set including a latchbolt, a deadbolt and control mechanism for both bolts. Each bolt is operable through either an external or an internal (i.e., relative to an associated door) actuator and the two internal actuators are interconnected through drive means so that operation of one to cause retraction of its respective bolt also causes retraction of the other bolt. The drive means includes a lost motion connection so that the latchbolt can be retracted and extended at will while the deadbolt remains in the retracted position. Locking means is operative to hold the external actuator of the latchbolt against operation and the deadbolt actuators are connected to that locking means so as to deactivate the locking means as the deadbolt is retracted. Both deadbolt actuators may be also connected to the locking means so as to activate that locking means when the deadbolt is moved towards its operative position. Operating means may also be provided to enable activation and deactivation of the locking means independant of the deadbolt actuators.
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