Locks – Operating mechanism – Key
Patent
1992-09-16
1993-05-11
Gall, Lloyd A.
Locks
Operating mechanism
Key
70495, E05B 2704
Patent
active
052090876
ABSTRACT:
A removable core cylinder lock having separate key-operated tumbler controlled fences is disclosed. The separately keyed fences permit differentiation between a locking/unlocking operational mode and a core insertion/removal mode to enhance security and applicability of the lock. The lock comprises a core received by a housing. The core has a longitudinal fence retractable by alignment of one group of tumblers and a transverse retainer retractable by alignment of a second group of tumblers wherein both fence and retainer engage the housing to lock the core therein. Insertion of a proper unlocking key permits retraction of the fence without retraction of the retainer so that the core can be rotated in the housing but not removed therefrom. Insertion of a proper removal key permits retraction of the fence and retainer for removal of the core from the housing. In such manner, one core can be rapidly substituted for another to change the keying for the unlocking mode.
REFERENCES:
patent: Re30198 (1980-01-01), Oliver et al.
patent: Re31910 (1985-06-01), Oliver
patent: 3722240 (1973-03-01), Spain et al.
patent: 3990282 (1976-11-01), Sorum
patent: 4412437 (1983-11-01), Smith
patent: 4440009 (1984-04-01), Smith
patent: 4741188 (1988-05-01), Smith
patent: 4809525 (1989-03-01), Cox
patent: 4866964 (1989-09-01), Hall
Gall Lloyd A.
Lundeen Daniel N.
Pryzant Andrew S.
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