Method of providing a universal keyway lock and plug therefor

Details Method of providing a universal keyway lock and plug therefor Method of providing a universal keyway lock and plug therefor

1989-06-05

1993-02-02

Lindsey, Rodney M.

Locks

Operating mechanism

Key

70340, 70492, 70406, G05B 3508

Patent

active

051829290

ABSTRACT:
A method and replacement plug for cylinder locks converts locks having special keyways requiring correspondingly warded key blanks into a universal keyway lock that can be properly operated by a multiplicity of differently warded keys.

REFERENCES:
patent: 1860708 (1932-05-01), Falk
patent: 1958603 (1934-05-01), Bacon
patent: 2182809 (1939-12-01), Johnstone
patent: 2766611 (1956-10-01), Hagel
patent: 3137156 (1964-06-01), Navarro
patent: 3499304 (1970-03-01), Naujoks
patent: 3555859 (1971-01-01), Berkowitz
patent: 3881333 (1975-05-01), Christmas
patent: 4075879 (1978-02-01), Christopher
patent: 4302957 (1981-12-01), Wolter
patent: 4440009 (1984-04-01), Smith

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