Security lock for emergency door latch mechanism

Details Security lock for emergency door latch mechanism Security lock for emergency door latch mechanism

1976-06-14

1978-04-18

Foss, J. Franklin

Closure fasteners

Bolts

Emergency operating means

70 92, 292DIG2, E05C 1502

Patent

active

040848450

ABSTRACT:
There is disclosed a security lock for emergency door latches which are typically provided with a crash bar pivotally carried on the door and extending transversely across its inner face. The security lock comprises a bracket arm which is pivotally mounted on the side brackets of the door latch mechanism and which carries, on its free end, a cover bar which overlies a substantial portion of the crash bar. The bracket arm is provided with locking means for restraining its pivotal movement whereby the bracket arm and its dependent cover bar can be restrained in a raised or lowered position, thereby preventing actuation of the crash bar, or locking the crash bar in its latch disengaging position.

REFERENCES:
patent: 2198359 (1940-04-01), Voight et al.
patent: 2212957 (1940-08-01), Spradling
patent: 3130994 (1964-04-01), Balducci
patent: 3148903 (1964-09-01), Foster
patent: 3530695 (1970-09-01), Balducci
patent: 3705739 (1972-12-01), Adler
patent: 3788688 (1974-01-01), Chandler

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