Cylindrical lock and key therefor

Details Cylindrical lock and key therefor Cylindrical lock and key therefor

1993-07-16

1995-04-04

Cuomo, Peter M.

Locks

Operating mechanism

Key

70404, 70423, E05B 2700

Patent

active

054026628

ABSTRACT:
A cylindrical lock includes a casing having an annular front face with an inner circumferential portion surrounding a key insert member received by a key. A keyhole is defined between the inner circumferential portion and the key insert member, a lower portion of the key insert member is displaced from an axial center of a lock cylinder by a predetermined distance. The key includes a cylindrical end received by the key hole. A thickness of an upper side of the cylindrical end is different from a thickness of the lower end such that, when the key is rotated, the displaced lower side of the key insert member causes a width of portions of the keyhole to be varied. Thus picking of the cylindrical lock with a picking tool or the like is prevented.

REFERENCES:
patent: 651130 (1900-06-01), Carter
patent: 3343386 (1967-09-01), Hall
patent: 3494159 (1970-02-01), Greenwald
patent: 3903720 (1975-09-01), Scherbing
patent: 4083211 (1978-04-01), Scherbing
patent: 4094177 (1978-06-01), Wellekens
patent: 4111020 (1978-09-01), Scherbing
patent: 5020349 (1991-06-01), Lee
patent: 5024072 (1991-06-01), Lee
patent: 5097686 (1992-03-01), Plumer

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