Patent ID: 8631670

Claim:
A lock suitable for a sliding barrier, said lock comprising a) a housing b) a latch linkage moveable between a locked position in which at least part of the latch linkage extends from the housing for engagement with a strike, and an unlocked position in which the latch linkage is at least partly retracted into the housing; and c) a locking assembly comprising i) a moveable base member, said base member being coupled to the latch linkage to move between a first position in which the latch linkage is in a locked position, and a second position in which the latch linkage is in its unlocked position; ii) a locking arrangement configured and adapted to be actuated for movement between a locking position when the base member is in its first position, and in which the base member is prevented from moving relative the housing, and a free position wherein the locking arrangement does not prevent movement of the base member; iii) a manual lever associated with the base member, said lever being manually operable by a user to move the base member between its first position and second position, thereby moving the latch linkage between its locked and unlocked position respectively; and iv) an engaging member, said engaging member configured and adapted to be movable by at least one actuator; said engaging member being associated with the base member to move relative to it in a lost motion manner to move the base member between its first position and second position, wherein the lost motion movement by the engaging member relative to the base member is between an engaged configuration, and an unengaged configuration; said engaging member including an actuating formation which is configured and adapted to engage with the locking arrangement to actuate it to its locking position when the configuration of the base member and the engaging member is in an engaged configuration and the base member is in its first position, thereby deadlocking the base member against movement by operation of the manual lever; wherein the base member and engaging member are pivotably movable relative to the housing, and wherein the engaging member is movable in a direction parallel to its axis of rotation and biased towards the base member to engage with at least the base member when the engaging member and the base member are in their unengaged configuration, and to engage with at least the locking arrangement when the engaging member and the base member are in their engaged configuration, to thereby deadlock the base member.