Lighting fixture for high intensity lamps

Claim 1

A lighting fixture of the floodlight type comprising: a housing comprising a heat dissipation plate having ribs of concave configuration integrally cast with the inner surface of the plate, said housing having a hinged front door supporting a heat treated glass lens therein movable between open and closed positions, a reflector mounted on the ribs and secured to conform to the concave ribs in said housing, a pair of spaced lamp receiving sockets mounted on said housing, a movable porcelain block in each of said sockets having a centrally-disposed electrical contact element therein and leadin conductors connected to said contact elements, a high-intensity filament type lamp mounted in front of said refLector, said lamp having sealed ends and terminals extending from the lamp filament element embedded in a ceramic sleeve bonded to each of said sealed ends, each of said terminals being arranged for contact with said contact element in said sockets for furnishing electrical power to said lamp, each of said sockets having an opening therein in alignment with the end of said lamp and of a size just sufficient to accomodate replacement of said lamp, and of a size less than the diameter of said ceramic sleeve, and wherein a major portion of the sealed ends on the lamp lie within said sockets, the parts being arranged such that the socket walls forming the relatively narrow opening into which the lamp ends fit, inhibits the radiation of heat from the lamp filament element to the sealed ends on the lamp, but permits the radiation of heat from said sealed ends to the socket walls which comprise a heat sink for absorbing such heat and conducting it to said housing.