Importance

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Abstract

A deadbolt lock mechanism of the single cylinder type is disclosed having a latch bolt which is movable between extended and retracted positions by means of a lock cylinder at one side thereof. A thumbturn, together with manually movable coupling control means for controlling the coupling between the thumbturn and latch bolt are located at the other side of the mechanism. In the bolt retracted position, the coupling control means is movable between coupling enabling and disabling positions to condition the coupling for operation of the latch bolt by the thumbturn in the enabling position thereof, and for disabling such latch bolt operation by the thumbturn in the disabling position. Consequently, the latch bolt is operable by the lock cylinder in any position of the thumbturn and coupling control means, whereas the thumbturn is enabled for operation of the latch bolt only when the coupling control means has been moved into enabling position.

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First Claim