Hazardous location-rated plug
DCFirst Claim
1. An electrical plug for connection to an associated electrical device by means of conductor wires, for use in hazardous locations for delivering current from an energized receptacle to said plug, comprising:
- (a) a metal housing comprising a cylindrically-shaped side wall and an end wall for defining a plug chamber, the end wall having a hole for permitting the conductor wires to enter said plug chamber;
(b) a cylindrically-shaped sleeve made from a nonconductive material having an outside diameter slightly less than that of the inside diameter of said plug chamber, said sleeve being positioned inside said plug chamber so that one end abuts the end wall of said metal housing, and the opposite end provides a bearing surface, said sleeve insulating the conductor wires from accidental contact with the metallic surface of said housing side wall;
(c) a dead-front plug base comprising a nonconductive base portion having at least two holes bored therethrough, a like number of conductive line terminal prongs protruding through said holes having a first end for insertion into the receptacle, and a second end connected to fastening means for securing the ends of the conductor wires to the terminal prongs, said plug base fitting inside said plug chamber in abutted relation to the bearing surface of said insulating sleeve to cover the open end of said plug housing; and
(d) means for securing said plug base to said plug housing to provide a secure seal for containing any ignited hazardous materials inside said plug.
1 Assignment
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Accused Products
Abstract
An electrical plug for an associated electrical device for use in hazardous locations, comprising a metal housing; a nonconductive plug base holding at least two conductive terminal prongs connected to conductor wires passing through the housing and connected at their other end to the electrical device; and a plastic sleeve for preventing contact between the conductor wires and the metal housing, providing a bearing surface for the plug base and an elastomeric gasket compressed therebetween, cooperating with a reversible clamp to mechanically grip the conductor wires and prevent their separation from the terminal prongs, and providing simple measurement of a predetermined length of wire between the clamp and each terminal. A rubber grommet provides a moisture-resistant seal along the back end of the plug housing. A label plate may be affixed to the exterior surface of the plug housing by means of peened over posts that do not interfere with the integrity of the plug housing.
39 Citations
16 Claims
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1. An electrical plug for connection to an associated electrical device by means of conductor wires, for use in hazardous locations for delivering current from an energized receptacle to said plug, comprising:
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(a) a metal housing comprising a cylindrically-shaped side wall and an end wall for defining a plug chamber, the end wall having a hole for permitting the conductor wires to enter said plug chamber; (b) a cylindrically-shaped sleeve made from a nonconductive material having an outside diameter slightly less than that of the inside diameter of said plug chamber, said sleeve being positioned inside said plug chamber so that one end abuts the end wall of said metal housing, and the opposite end provides a bearing surface, said sleeve insulating the conductor wires from accidental contact with the metallic surface of said housing side wall; (c) a dead-front plug base comprising a nonconductive base portion having at least two holes bored therethrough, a like number of conductive line terminal prongs protruding through said holes having a first end for insertion into the receptacle, and a second end connected to fastening means for securing the ends of the conductor wires to the terminal prongs, said plug base fitting inside said plug chamber in abutted relation to the bearing surface of said insulating sleeve to cover the open end of said plug housing; and (d) means for securing said plug base to said plug housing to provide a secure seal for containing any ignited hazardous materials inside said plug. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification