Cylinder guard

Details Cylinder guard Cylinder guard

1992-02-05

1993-03-23

Luebke, Renee S.

Locks

Operating mechanism

Key

70423, 70427, 70455, 411910, E05B 1300

Patent

active

051953420

ABSTRACT:
An access cover plate is secured to a door by tamper-proof fasteners. A hole in the cover plate is concentric with a cylinder lock keyhole and provides access for the key and actuation of the primary lock. The cover plate access hole is closed off by a removable threaded plug which engages female threads in the hole of the cover plate. When secured in place, the plug is forcibly tightened against the face of the cylinder lock. The plug includes a recessed, tamper-proof wrenchable socket which permits removal of the plug only by a specially designed socket wrench. The tamper-proof socket has a polygonal wall and an axial guard pin.

REFERENCES:
patent: 960421 (1910-06-01), Sibley
patent: 1436488 (1922-11-01), Facciano
patent: 3279838 (1966-10-01), Hamilton
patent: 4073165 (1978-02-01), Grundstrom et al.
patent: 4107967 (1978-08-01), Grabb
patent: 4118962 (1978-10-01), Block et al.
patent: 4237712 (1980-12-01), Cramer
patent: 4428211 (1984-01-01), Hermann
patent: 4589693 (1986-05-01), Kennedy
patent: 4712403 (1987-12-01), Markisello
patent: 4732024 (1988-03-01), Nagy

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