Abstract: A latch strike for a sliding door and being cooperable with a locking bar which is pivotally mounted on the door and has a latching recess within an upper edge. The latch strike includes a housing having an opening for receiving the lock bar and a latch bolt movably mounted on the housing for movement between a latching position at which it is engagable within the latching recess and a delatching position at which it is not so engagable. A deadlocking lever is carried by the latch bolt and is movable relative thereto between an operative position at which it is engagable with an abutment to thereby prevent movement of the latchbolt out of its latching position, and an inoperative position at which it does not influence the latch bolt movement. A control member normally holds the deadlocking lever in its inoperative position and is responsive to location of the latch bar within the latching recess to free the lever for movement into its operative position.

Abstract: An actuator assembly in which the actuator is usually the rotatable barrel of a key operated tumbler lock. The actuator assembly is connectable through a non-circular drive spindle to any conventional deadbolt assembly of the kind having a tubular housing securable to support, a lever rotatably mounted on the housing and a deadbolt slidably mounted within the housing and responsive to rotation of the lever. A body member of the actuator assembly is securable to the support separate from the deadbolt housing and the lock barrel is rotatable relative to that body member. A gear segment secured to the barrel for rotation therewith is engageable with another gear segment rotatably carried on the body member, but only during part of its possible 360.degree. movement from the rest or locked position of the barrel. The other or driven gear segment has a drive spindle secured to it and that spindle engages within a bore of the bolt assembly lever to transmit rotation of the driven gear segment of the lever.

Abstract: Deadbolt mechanism for holding a door in a closed position and including a deadbolt pivotally connected to the mechanism housing for movement into and out of that housing to adopt inoperative and operative positions respectively. A pin tumbler lock is used to operate the deadbolt and the lock barrel is rotated through 360.degree. during the change of deadbolt positions whereas the deadbolt swings through 90.degree. only. The drive between the lock barrel and deadbolt includes a pair of gear segments which engage during the 90.degree. travel of the deadbolt and are otherwise disengaged to permit the lock barrel to rotate free of the deadbolt. The drive also includes a pivoted arm which locates between side walls of the deadbolt and has a laterally extending pin slideably locating within a slot in each of the side walls. When the gear segments are engaged the arm is swung such that a camming action occurs between the pin and cooperating slots whereby the deadbolt is caused to move about its pivot.

Abstract: 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.