Locking device for the prongs of an electrical plug

Details Locking device for the prongs of an electrical plug Locking device for the prongs of an electrical plug

1975-11-28

1977-05-24

Dost, Gerald A.

Geometrical instruments

85 45, H01R 1354

Patent

active

040251403

ABSTRACT:
In one embodiment a protective housing adapted to be locked upon and cover a prong of an electrical plug is disclosed. The housing has a chamber to receive a prong of the plug and has a collared recess and threaded bore on one side communicating with the chamber to receive a lock screw that impinges upon the prongs. The head of the lock screw is guidably received in the collared recess and has a side slot. A key is provided with a tab at one end that engages the slot and the collared recess allows the key to turn the lock screw to and from its locked position against the prong.
In another embodiment a lock screw with a slotted head and key therefor is described wherein the bottom contour of the slot is provided with convolutions conforming with the extended end edge of the blade of a key therefore adapted to turn the lock screw within a housing to impinge the end of the screw against the prong of an electrical plug thereby holding the housing over the prongs so that unintentional connection to an outlet is prevented.

REFERENCES:
patent: 379200 (1888-03-01), Hanlon
patent: 2654073 (1953-09-01), Katz
patent: 3273442 (1968-09-01), Launay

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