Patent ID: 8162509
Filing Date: 2012-04-24
Classification: F21V

Abstract:
1. A light fixture for use in a hazardous atmosphere comprising: a housing including a metal shell, glass lens and a cover frame including protective gridwork providing an electrical, explosion-proof enclosure; said shell and said cover frame constructed and arranged to provide a first quenching flame path; said shell defining a boss having a cylindrical wall extending from said shell and defining a first circumferential ground surface surrounding an access opening; a lampholder, including a mounting bracket; a halogen lamp removably mounted to said mounting bracket; electrical feed wires coupled to said lampholder; an end cap receiving said wires and cooperating with said boss of said shell to enclose said lampholder assembly when placed through said boss into said housing, said end cap defining a second circumferential ground surface cooperating with said first circumferential ground surface when said end cap is assembled to said boss to form a second quenching flame path; a threaded lock nut for securing said end cap and said lampholder assembly to said boss while permitting said lampholder assembly to be withdrawn from said housing through said boss as a unit when said lock nut is removed; and a positioning member in the form of an elongated raised member on one of an interior wall of said boss and said lampholder, and further including a recess in the other of said interior wall of said boss and said lampholder, said recess receiving said raised member when said lampholder is assembled to said shell, said raised member and said recess being constructed and arranged to limit the insertion and prevent rotation of said lampholder and position said lamp within said housing when said end cap is tightened on said boss.