Electric plug lock

Details Electric plug lock Electric plug lock

1992-02-03

1992-12-08

Bradley, Paula A.

Electrical connectors

With unauthorized connection preventer, e.g., key or...

Prong cover

70 23, 70314, 70 57, 439304, 439139, 439892, H01R 1340

Patent

active

051693267

ABSTRACT:
An electric plug combination lock for locking the prongs of an electric plug thereto. The lock includes a casing enclosing a chamber having a lock subassembly therein which has a frame lock portion with lock hooks that lock into holes in the prongs of the electric plug, a spring biasing the frame lock portion to the locked position and a combination lock for preventing the frame lock from entering the unlocked position unless the correct combination is present.

REFERENCES:
patent: 2654073 (1953-09-01), Katz
patent: 2733416 (1956-01-01), Evalt
patent: 3543544 (1970-12-01), Efston
patent: 4770013 (1988-09-01), Nakai
patent: 4860561 (1989-08-01), Hwang

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