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

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Locking device for the prongs of an electrical plug

Details

Inventors: Matys, Edwin J.;
Assignee: Tula Machine Co., Inc. (Chicago, IL)
Primary Examiner: Dost; Gerald A.
Assistant Examiner:
Attorney, Agent or Firm: Thomas; Bruce K.

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.

DETAILED DESCRIPTION What is claimed is: 1.
A locking device to cover a prong of an electrical plug and prevent inadvertent use comprising: a housing defining a chamber opening to one side thereof and adapted to receive and cover a prong of an electrical plug; said housing having a collared recess on a second side adjacent said one side; a threaded bore extending from said recess into communication with said chamber; a locking screw engageable within said threaded bore for pressure contact with said prong within said chamber; said locking screw having a head portion guidably received within said collar; said head portion having an outer face and a slotted side; and a key member having a shank portion with an end matable with the face of said head portion of said locking screw and a tab portion receivable in said slotted side whereby upon engagement of said key member with said head portion of said locking screw allows said locking screw to be turned into and out of said pressure contact with said prong.
2.
A locking device in accordance with claim 1 in which: said head portion has an outer contoured face; and said shank portion of said key member has a contoured end matable with the contoured face of said head portion of said locking screw.
3.
A locking device in accordance with claim 1 in which: said head portion has an outer conical face; and said shank portion of said key member has a conical contoured end matable with the contained face of said head portion of said screw member.
4.
A locking device in accordance with claim 1 in which: said housing defines a second open-ended chamber having an outer wall and an internal wall between said first and second chambers adapted to receive and cover a second prong of an electrical plug; and the lateral distance between one side of said internal wall defining said first chamber and the inside of said outer wall is substantially the same as the lateral spacing of said prongs whereby the pressure contact of said locking screw upon said one prong forces the respective prongs against the inner sidewalls of said chambers

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