Keys for high security cylinder lock systems

Details Keys for high security cylinder lock systems Keys for high security cylinder lock systems

1998-10-07

2000-09-19

Pham, Teri

Locks

Operating mechanism

Key

70389, 70390, 70419, E05B 1904

Patent

active

061194964

ABSTRACT:
A blank for use in fabricating a key for a cylinder lock having a camming projection extending outwardly from a first side of the blade portion of the blank and a recess in the opposite side of the blade portion. The projection and recess are simultaneously formed in a punching operation and have at least one different geometrical parameter whereby the camming projection is not complementary to the recess and/or has a different orientation than the recess.

REFERENCES:
patent: 375540 (1887-12-01), Donahue
patent: 1403472 (1922-01-01), Horak
patent: 2151245 (1939-03-01), Swilens
patent: 3742744 (1973-07-01), Lumme
patent: 4325242 (1982-04-01), Tietz
patent: 4608842 (1986-09-01), Tietz
patent: 4612787 (1986-09-01), Prunbauer et al.
patent: 4869085 (1989-09-01), Meissner
patent: 5617750 (1997-04-01), Preddy
patent: 5819567 (1998-10-01), Eden, Jr.

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