Cylinder lock device resistible against unauthorized unlocking

Details Cylinder lock device resistible against unauthorized unlocking Cylinder lock device resistible against unauthorized unlocking

1994-03-29

1995-07-04

Cuomo, Peter M.

Locks

Operating mechanism

Key

70276, 70379R, 70367, E05B 1704

Patent

active

054289785

ABSTRACT:
A cylinder lock device (10) includes a lever (15) rotatably disposed between a casing (11) and a key cylinder (13), and a blocking member (17) disposed within a notch (16) formed in the lever (15). A concavity (18) are formed on an inner wall of the casing (11), and a chamfer (19) is formed on the key cylinder (13). When the lever (15) is in the locked position and the key cylinder (13) is further rotated to the dead-locked position over the locked position, the blocking member (17) moves away from the chamfer (19) of the key cylinder (13) and into the concavity (18) of the casing (11). When the key is pulled out from the key cylinder in the dead-locked position, the locking device is forcibly maintained in the locked position to prevent unauthorized unlocking.

REFERENCES:
patent: 3197985 (1965-08-01), Cosio
patent: 4326396 (1982-04-01), Steinbach
patent: 4395893 (1983-08-01), Steinbach
patent: 4563885 (1986-01-01), Madden
patent: 4829798 (1989-05-01), Roop
patent: 5044183 (1991-09-01), Neyret
patent: 5265453 (1993-12-01), Konii et al.
patent: 5339663 (1994-08-01), Doring

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