Importance

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Abstract

A luminaire comprises a transparent enclosure tube, a cylindrical handle housing at one end of the tube, and a cylindrical cap housing at the opposite end of the tube. A light carriage within the tube comprises a unitary subassembly consisting of a rigid reflector having light bulb holders at opposite ends and a fluorescent bulb secured between the holders. The light carriage is removeable and replaceable as a unit without tools through an open end of the tube by unplugging it from and plugging it into a contact receptacle in the handle housing. Complementary plug and socket formations in the handle housing and light carriage assure alignment of bulb contacts. The housings have castellated ends engageable with detents on mounting brackets on a base to hold the luminaire and to direct light in a selected direction. The cap housing has a telescopical end section which is manually moveable against a spring to release the luminaire from the base without tools. An explosion proof enclosure for a lighting system which powers the luminaire has multiple identical explosion proof inlet and outlet openings which handle both high voltage AC circuits and low voltage DC intrinsically safe circuits. Each enclosure has thick flat metal plate end walls and a plurality of identical circular openings located side by side in the wall. Each opening has an internal surface configuration defining one side of a flame-quenching path. For AC power connections, explosion proof receptacles are fitted in some of the openings each receptacle having external surface configurations which define the other side of the flame-quenching path. For intrinsically safe circuit conductors, other openings are fitted with adaptors having identical external surface configurations defining flame-quenching paths, and the adaptors have a variety of electrical and mechanical mechanisms controlling access to the enclosure; three examples of such mechanisms are given as a solid plug, intrinsically safe receptacles, and a switch actuating plunger.

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First Claim