Electric plug lock

Details Electric plug lock Electric plug lock

1990-10-09

1991-10-08

Bradley, Paula A.

Electrical connectors

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

Prong cover

439133, 439149, 439304, H01R 13422

Patent

active

050550578

ABSTRACT:
A locking device for attachment to the male electric plug on the power supply line to an electric appliance, for the purpose of preventing use of the appliance, comprises a maximum of four separately molded plastic parts, two of which are identical and are secured together to form a housing containing one of the other two components, which is a unitary molded plastic spring locking member. The housing is provided with a pair of slots for receiving the prongs on the electric plug to be locked, and insertion of the prongs into the housing automatically effects the locking action. The device can be unlocked only by a key which is separate from the device, and which is the fourth component and is inserted through an opening into the interior of the housing to release the locking action.

REFERENCES:
patent: 2664734 (1954-01-01), McEneaney
patent: 2733416 (1956-01-01), Evalt
patent: 3543544 (1970-12-01), Efston
patent: 4025140 (1977-05-01), Matys
patent: 4030795 (1977-06-01), Niemann

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