Lock for fire doors

Details Lock for fire doors Lock for fire doors

1977-11-21

1979-03-27

Foss, J. Franklin

Locks

Special application

For closures

292 92, 292DIG66, 292DIG65, E05F 1520, E05C 1900

Patent

active

041459008

ABSTRACT:
A surface mounted rim type lock set assembly for use on fire doors wherein a latch bolt is adapted for release by operation of a cross-bar on one side of the door and for release independently by manual operation of a lever-type handle on the other side, the assembly including a locking slide which is held out of engagement with the handle hub by heat responsive means adapted to release the slide when a portion of said means is melted. Normal locking and unlocking of the handle is effected by a key in a cylinder lock.

REFERENCES:
patent: 1653143 (1927-12-01), Zur
patent: 2536295 (1951-01-01), Leonard
patent: 2858157 (1958-10-01), Eichacker
patent: 3097007 (1963-07-01), Eichacker et al.
patent: 3271982 (1966-09-01), Welch
patent: 3324692 (1967-06-01), Welch
patent: 3705739 (1972-12-01), Adler
patent: 3811717 (1974-05-01), Floyd
patent: 4003593 (1977-01-01), Wilzig
patent: 4007954 (1977-02-01), Erickson

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