Locks – Operating mechanism – Key
Patent
1973-09-10
1976-02-17
Frazier, Roy D.
Locks
Operating mechanism
Key
70421, 70419, E05B 2706
Patent
active
039383580
ABSTRACT:
A highly safe, relatively pick-proof lock to be used as a replacement for standard lock cylinders in conventional doors. A plurality of independently operating locking means serving to enhance the difficulty of picking a lock including split keyways, locking cams, shear line blocking means and a hardened steel face plate.
REFERENCES:
patent: 1905177 (1933-04-01), Kirkwood
patent: 2032974 (1936-03-01), Bradshaw
patent: 2070233 (1937-02-01), Liss
patent: 2197673 (1940-04-01), Albertz
patent: 2431894 (1947-12-01), Spain
patent: 3078706 (1963-02-01), Russell
patent: 3500670 (1970-03-01), Hawkins
patent: 3507133 (1970-04-01), Basseches
patent: 3670540 (1972-06-01), Fernandez
Doyle David
Shtulman Murray M.
Aschenbrenner Peter A.
Berger Peter L.
Frazier Roy D.
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