Positional multiplex keyway system

Details Positional multiplex keyway system Positional multiplex keyway system

2006-08-11

2009-08-11

Cuomo, Peter M (Department: 3673)

Locks

Operating mechanism

Key

C070S339000, C070S340000, C070S409000

Reexamination Certificate

active

07571629

ABSTRACT:
A method and apparatus for extending an existing simplex or multiplex lock-and-key system that includes a family of first keys each having a first profile and of a corresponding plurality of first locks each operable by a first key and each having a first keyway configured for accepting the first key profile. Second keys of a new family are defined with a core section corresponding to the first key profile and a narrowed projection extending from the bottom of the core section. Corresponding second locks have a second keyway profile defined as the compliment of the second key profile, thus including a complimentary core section and a foot recess extending from the bottom of the second keyway core section. The second locks accept a second key positioned at the second keyway baseline to normally lift the lock pin stacks and operate the second lock. The second locks also accept the first keys but the first keys cannot enter the narrowed foot recess of the second keyway and are accordingly elevated in the second keyway above the keyway baseline, and are therefore unable to normally lift the lock pin stacks to operate the second lock.

REFERENCES:
patent: 1850586 (1932-03-01), Heyer
patent: 2197673 (1940-04-01), Ricardo
patent: 4107963 (1978-08-01), Yorio et al.
patent: 4440009 (1984-04-01), Smith
patent: 4912953 (1990-04-01), Wobig
patent: RE35518 (1997-05-01), Sussina
patent: 5943890 (1999-08-01), Field et al.
patent: 7073360 (2006-07-01), Johansson et al.

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