Security device for a cylinder lock

Details Security device for a cylinder lock Security device for a cylinder lock

1994-11-10

1996-11-26

Gall, Lloyd A.

Locks

Operating mechanism

Key

70371, 70451, 70466, 70DIG57, E05B 904

Patent

active

055774083

ABSTRACT:
An arm is affixed to the inner face of the lock cylinder and prevents the lock cylinder from being removed from the lock case. A screw attaches the arm to the lock cylinder. The lock cylinder has a cam which is also attached to the inner face of the lock cylinder and rotates to operate the lock case mechanisms. The cam, when it is rotated into a lock position, covers the head of the screw and prevents the screw from being removed. Since the cam prevents removal of the screw, the arm cannot be removed from the lock cylinder and the lock cylinder cannot be removed from the lock case.

REFERENCES:
patent: 1253470 (1918-01-01), Cox
patent: 1268137 (1918-06-01), Mailloux
patent: 1337137 (1920-04-01), Kaplan
patent: 1512939 (1924-10-01), Ledin
patent: 1546626 (1925-07-01), Crouch
patent: 1986453 (1935-01-01), Shaw
patent: 3368374 (1968-02-01), Eads
patent: 3760619 (1973-09-01), Colombo
patent: 3763673 (1973-10-01), Colombo et al.
patent: 3855826 (1974-12-01), Hori
patent: 3981168 (1976-09-01), Vanelli Coralli et al.
patent: 4202587 (1980-05-01), Wieland
patent: 4223542 (1980-09-01), Basseches
patent: 4567741 (1986-02-01), Trempala
patent: 5377511 (1995-01-01), Meckbach

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