Locks

摘要

C:4RPonbr/DCC/PLW/300649 .1.DOC- 1 5/02010 A door lock comprising a tongue movable from an extended to a retracted position relative to a lock casing by operation of one or other of a pair of rotary actuators each 5 independently actuable by a handle at a respective side of the door, a lock member movable between an unlocking position and a locking position, and a lock handing system associated with the lock member for selectively rendering a selected one or both of the actuators inoperative to cause retraction of the tongue by operation of the associated handle when the lock member is in the locking position, wherein the lock incorporates a 10 selectively operative kick-off function to cause the lock member to be moved from its locking position to its unlocking position in response to retraction of the tongue, the kickoff function being provided by a screw removably insertable into the lock member from externally of the casing such that when the lock member is in its locking position the screw will lie within the path of movement of a component which moves with the tongue 15 whereby upon retraction of the tongue the component will interact with the screw to cause displacement of the lock member to its unlocking position.