Pick-proof lock

Details Pick-proof lock Pick-proof lock

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

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