Locks – Operating mechanism – Key
Patent
1984-11-08
1987-06-16
Houco, Thomas J.
Locks
Operating mechanism
Key
70369, 70377, E05B 2902
Patent
active
046728279
ABSTRACT:
A cylinder lock with a removable plug incorporates a series of spring biased combinating disc tumblers which cooperate with a first key in normal lock operation. An additional, unbiased control tumbler at the end of the plug cooperates with a retention flange associated with the cylinder to retain the plug against removal from the cylinder while permitting rotation of the plug in the cylinder. The control tumbler includes a notch for receipt of the first key as well as a second, plug removal key. The first key acts against one edge of the notch to displace the control tumbler into a position which ensures that the tumbler will remain engaged with the plug retention flange regardless of the orientation of the plug. The second key includes special bitting adapted to engage a separate second edge of the notch associated with the control tumbler to translate the control tumbler such that when the plug is rotated appropriately, the control tumbler is oriented to slide through an axial or longitudinal groove in the cylinder thus permitting removal of the plug from the cylinder.
REFERENCES:
patent: 1805891 (1931-05-01), Shinn
patent: 1831118 (1931-11-01), Jacobi
patent: 1979938 (1934-11-01), Jacobi
patent: 2061456 (1936-11-01), Falk
patent: 2460709 (1949-02-01), Navarro
patent: 2647391 (1953-08-01), Uher
patent: 3263461 (1966-08-01), Tartagua
patent: 3751952 (1973-08-01), Rubner
patent: 3774423 (1973-11-01), Orr
patent: 4398405 (1983-08-01), Patriquin
patent: 4416129 (1983-11-01), Thimot
patent: 4440008 (1984-04-01), Uher
Dino Suzanne L.
Houco Thomas J.
Keycon Hardware Products, Inc.
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