Cylinder lock and key

Details Cylinder lock and key Cylinder lock and key

1995-09-18

1997-04-01

Dino, Suzanne

Locks

Operating mechanism

Key

70421, 70493, E05B 1500

Patent

active

056155662

ABSTRACT:
An improved security cylinder lock and key for operating the cylinder lock are disclosed. The cylinder lock has conventional tumbler locking structure and a secondary locking bar that operates independently of the tumblers. The secondary locking bar prevents operation of the cylinder lock until a properly configured key is placed in the keyway of the cylinder lock.

REFERENCES:
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patent: 2013730 (1935-09-01), Jacobi
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patent: 3425248 (1969-02-01), Duval
patent: 3575024 (1971-04-01), Schlage
patent: 4114411 (1978-09-01), Schlage
patent: 4194379 (1980-03-01), Dice, Sr.
patent: 4341102 (1982-07-01), Ku et al.
patent: 4635455 (1987-01-01), Oliver
patent: 4732022 (1988-03-01), Oliver
patent: 4756177 (1988-07-01), Widen
patent: 4823575 (1989-04-01), Florian et al.
patent: 5016455 (1991-05-01), Hennessy
patent: 5101648 (1992-04-01), Kuster

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