Changeable code lock

Details Changeable code lock Changeable code lock

1991-08-08

1993-05-11

Cuomo, Peter M.

Locks

Operating mechanism

Key

70491, 70411, 70377, E05B 2500

Patent

active

052090884

ABSTRACT:
A cylindrical key operated variable code lock provides a shell having a cylindrical inner surface and an orifice for accepting a key. The key may be generally cylindrical in shape carrying a number of lugs thereon that are rotationally variable. The drum is normally rotationally fixed relative to the shell by a plurality of locking elements. In response to the insertion of a key having a predetermined code each of the locking elements, conversely, allow the rotation of the drum relative to the shell. The locking elements may be reconfigured in response to a predetermined varying of the key code. The reconfiguration may particularly entail the turning of the unlocked drum to a predetermined position and removing the key while the locking elements are in a state allowing recoding.

REFERENCES:
patent: 1720838 (1929-07-01), De Castro
patent: 2557028 (1951-06-01), Deutsch
patent: 3142167 (1964-07-01), Christopher
patent: 3404548 (1968-10-01), Keefer
patent: 3408840 (1968-11-01), Hasenbein
patent: 3599455 (1971-08-01), Pilvet
patent: 3817066 (1974-06-01), Pearson
patent: 3868838 (1975-03-01), Zimmerman et al.
patent: 4196606 (1980-04-01), Guiraud
patent: 4934164 (1990-06-01), Shew
patent: 4967578 (1990-11-01), Sheu et al.

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