Geometrical instruments
Patent
1982-09-29
1984-05-01
McQuade, John
Geometrical instruments
339 82, H01R 1344
Patent
active
044457383
ABSTRACT:
The locking device for an electrical plug comprises essentially a housing containing a lock mechanism, wherein the lock mechanism is a subassembly insertable into the housing. The lock mechanism comprises a lock body having a pair of spaced walls extending from a face wall which is provided with a centrally located aperture adapted to receive a manually operable key. The spaced walls provide a camming bed for rotatably supporting a cam member provided with an elongated cam slot. A pair of lock plates are provided with prong locking projections which are adapted to engage the openings in the prongs of the electrical plug, said locking projections also supporting said lock plates in opposed slots in the spaced walls. The opposite side of the cam member is provided with a key-engageable means which extends into an enlarged chamber between the spaced walls. The lock plates are also provided with transversely extending cam fingers which engage the cam slot. Securing means are provided for maintaining the lock mechanism in a predetermined position inside the housing. All of the components of the locking device are made from electrically non-conductive materials to preclude any possibility of a short circuit or body hazard to anyone tampering with the locking device. A shroud extends out of an end face of the housing to encircle the periphery of the abutting plug to discourage tampering. A modified form of a molded housing has an internal structure for supporting all of the movable locking components. A modified form of a lock mechanism comprises a unitary construction containing all of the locking components.
REFERENCES:
patent: 2654073 (1953-09-01), Katz
patent: 2664734 (1954-01-01), McEneaney
patent: 2733416 (1956-01-01), Evalt
patent: 3195100 (1965-07-01), Lee
patent: 3601761 (1971-08-01), Harris
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