Cylinder locks having removable lock barrels

Details Cylinder locks having removable lock barrels Cylinder locks having removable lock barrels

1990-12-11

1992-06-09

Linsey, Rodney M.

Locks

Operating mechanism

Key

70421, E05B 2902

Patent

active

051196549

ABSTRACT:
A cylinder lock having a removable barrel that includes a control tumbler. The barrel is retained in the housing of the lock by a nib that is formed on either the barrel or the interior of the housing. A longitudinal nib slot is formed on the other of either the barrel or the interior of the housing. The nib and the nib slot are aligned with one another only when the barrel is in an unlocking position for permitting the barrel to be removed from the housing. In this manner, the barrel may be removed from the housing only when both the barrel is in the unlocked position and when a special control key has been inserted into the barrel for withdrawing the control tumbler into the barrel.

REFERENCES:
patent: 1853403 (1932-04-01), Briggs
patent: 1990934 (1935-02-01), Falk
patent: 2046831 (1936-07-01), Lowe
patent: 2065683 (1936-12-01), Gahagan
patent: 2391833 (1944-12-01), Johnstone
patent: 4630457 (1986-12-01), Kincaid et al.
patent: 4809525 (1989-03-01), Cox
patent: 4976123 (1990-12-01), Ceron et al.

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