Importance

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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. The pin moves along the slots in one direction and then back again during each change of deadbolt position. A biassing spring is also located between the deadbolt side walls. A deflector plate is secured to the lower edge of the deadbolt and a transverse slot in the upper edge of the deadbolt receives an edge portion of a housing wall in the operative position of the deadbolt.

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First Claim