Deadlocking mechanism

DETAILED DESCRIPTION Having now described our invention, what we claim as new and desire to secure by Letters Patent is: 1.
Deadlocking mechanism including; a tubular casing securable to a support; a deadbolt slidably mounted within said casing for relative movement between an operative position in which a head portion thereof projects out of said casing, and an inoperative position in which said head portion is substantially contained within said casing; actuator means mounted on said casing and including a lock barrel which is located externally of said casing and is rotatable relative thereto towards and away from a lock position; a gear segment connected directly to said lock barrel for rotation therewith; a rack and pinion assembly located within said casing; said rack being movable lengthwise of said casing in response to rotation of said pinion, means connecting said rack to said deadbolt for movement therewith; lost motion means forming part of said connecting means and permitting limited relative movement between said rack and said deadbolt; a deadlocking member located within said casing and being operative to releasably hold said deadbolt in said operative position; said deadlocking member being responsive to said limited relative movement between said rack and deadbolt to release said deadbolt for movement into said inoperative position, and a gear segment connected to said pinion within said casing for rotation with said pinion and being engagable with said barrel gear segment through an opening in wall of said casing to form a drive connection whereby said deadbolt is moved between said operative and inoperative positions in response to rotation of said barrel; said two gear segments being relatively arranged so that said drive connection is automatically broken when said barrel is rotated in one direction beyond a disengage position thereof and is automatically reformed when said barrel is rotated in an opposite direction from beyond said disengage position; said barrel adopting said lock position when rotated in said one direction beyond said disengage position and having no influence on said deadbolt during rotation between said lock and disengage positions; said deadbolt being moved towards said operative position by rotation of said barrel in said one direction and being moved towards said inoperative position by rotation of said barrel in said opposite direction, said operative position corresponding to said disengage position of said barrel