Control Products Corporation

Perfecto Dacal

Explosion proof high intensity discharge lamp for mines or the like

Lamp having a rectangular bulb housing and a cage-like outer guard assembly therefor. The bulb housing is generally in the shape of a modified cube elongated in one direction. The housing has four substantially same size rectangular sidewalls extending between substantially square head and tail endwalls. One of the sidewalls is imperforate and serves as a mounting base. The other three sidewalls have windows of heavy, heat-resistant, transparent glass-like or ceramic material. The head endwall has a pair of glands including flanged, threaded bushings to seal electrical power conductors extending through it. The flanges of the bushing have wrench-engageable flats. The endwalls have a pair of axially aligned, screw-threaded openings of identical thread diameter and pitch. Screw-threaded head and tail cover members are threadedly engageable within these openings. A bulb socket member and a grounding lug are mounted on the inside surface of the head cover member, all being removable as a unit by unscrewing the head cover member. There is a central boss with wrench-engageable flats on the outside surface of the head cover member. A locking plate simultaneously engages flats on the gland bushings, and on the boss, to prevent loosening. A screw-threaded inspection plug in one of the sidewalls provides access to the grounding lug. The entire bulb housing is protected within a cage-like outer guard assembly. Different shaped reflector means between the bulb and housing direct the light through one or more selected side windows, in addition to an end window in the tail cover member.

High intensity discharge lamp for use in explosive atmospheres such as

Lamp having a lighting assembly, an inner guard assembly, and an outer guard assembly. The lighting assembly includes an elongated fluorescent bulb, starter and ballast members each having a socket portion removably connected to pins at the ends of the bulb, and an electrically conductive grounding bar interconnecting the starter and ballast members. The inner guard assembly includes a transparent cylindrical plastic housing enclosing the bulb, and end housings at the ends of the cylindrical housing enclosing the starter and ballast members respectively. The outer guard assembly includes an elongated support plate to which the end housings are fastened, a plurality of hoops fastened to the support plate at spaced intervals, and a plurality of guard rods parallel to the bulb housing welded across the hoops to provide a cage-like outer protection for the inner guard assembly. The ballast member is unitary, including one of the above-mentioned socket portions at one end removably electrically connected to the pins at one end of the bulb, and a plug at the opposite end removably electrically connected to a power outlet socket in the corresponding end housing of the inner guard assembly. The starter member is likewise unitary, including the other of the above-mentioned socket portions as an integral part thereof. The end housing at the starter member end of the lighting assembly has a removable cover for an opening through which the entire lighting assembly can be removed and replaced as a unit. The end housing at the ballast member end of the lighting assembly also has a removable cover providing access to the connection between the ballast member plug and the power outlet socket.

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Beckley, WV, United States of America

Perfecto Dacal