Locks – Special application – For closures
Patent
1975-03-27
1976-06-22
Frazier, Roy D.
Locks
Special application
For closures
70134, 70156, E05B 6315
Patent
active
039642810
ABSTRACT:
Double cylinder door lock which operates a ceiling- and/or floor-socketed lock bolt which can be added to inner face of already hanging door. Either or both operating cylinders can be key-operated pin tumblers.
REFERENCES:
patent: 750285 (1904-01-01), Johnson
patent: 1189991 (1916-07-01), Mugler
patent: 2772554 (1956-12-01), Schacht
patent: 2920474 (1960-01-01), Johns
patent: 3086383 (1963-04-01), Scott
patent: 3670537 (1972-06-01), Horgan
patent: 3759074 (1973-09-01), Prahl
Frazier Roy D.
Hafer Robert A.
Johnson Howard L.
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