A LOCK

摘要

A lock (1) is provided including a bolt (3), which is extendable and retractable to lock or unlock the lock (1) respectively. The lock (1) is configurable as either nominally locked or nominally unlocked and is deadbolted when the bolt (3) is extended beyond a certain extent and not deadbolted otherwise. The bolt (3) is moved by an actuation means (4) adapted to either retract the bolt (3) when the lock is nominally locked or extend the bolt (3) when the lock (1) is nominally unlocked by moving from a first to a second position. Sensing means (10) is provided to sense a transition when the lock (1) changes to or from being deadbolted.