Lock mechanism

Closure fasteners – Bolts – Sliding

Patent

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Details

70143, 29216913, E05C 110, E05B 5500

Patent

active

039333809

ABSTRACT:
A lock mechanism having a casing through which a spring-biased bolt is slidably movable, the bolt having an end which can be normally extended for a relatively short distance beyond the casing to assume a so-called "latching" position. A slidable sensing bar is arranged alongside of the bolt and in sliding contact therewith and the sensing bar is spring-biased so that it normally projects out of the casing for a distance co-extensive with the bolt while the bolt is either retracted or is in its latching position. A roller carried by the bolt is interposed between the bolt and the sensing bar and is confined in the casing in such a manner that while it rests upon a cam portion of the sensing bar, its bodily movement in the casing will be limited by a stop located therein and the bolt and the sensing bar will be maintained together in either the fully retracted position of the bolt or in its latching position. When the door on which the lock is fitted is moved to closing position, or is slammed shut, the sensing bar, contacting the striking plate on the door frame, will be held against advancement and the bolt entering the bolt opening in the striking plate, will be advanced by its spring bias to move the roller away from the stop, causing the bolt to be extended beyond its latching position to a locking or "dead bolt" position.

REFERENCES:
patent: 1191539 (1916-07-01), Schoell
patent: 1557374 (1925-10-01), Soley

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