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US 4,290,096 AGranted
Light fixture
OwnerRoman Szpurinventor
Life of this patent
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OwnerRoman Szpurinventor
Estimating the term…
A rectangular reflector sheet of relatively stiff aluminum is curved into the general shape of an elongated parabola and is inserted into a cylindrical transparent glass tube so that the edge portions of the sheet press outwardly against the tube. A set of end closure caps or members are clamped against the ends of the tube by a set of tie bolts which extend axially between the reflector sheet and the inner surface of the tube or outboard of the tube. Each of the end closure members is provided with an annular groove which confines a resilient gasket material to form a fluid-tight seal between the tube and the closure member. One of the end closure members has an eccentrically located hollow hub portion which supports a socket for receiving the socket end of an elongated lamp element extending along the offset focal axis of the curved reflector sheet. The other end closure member has a similar eccentric hub portion which supports a member for conducting heat from the lamp element as well as for supporting the opposite end of the lamp element. Each of the hub portions is closed by an end plug member which cooperates with the hub portion to define an annular L-shaped gap effective to release pressure within the tube and extinguish any flame in the event an environmental gas explodes within the tube.
A light fixture adapted for use in an explosive environment containing flammable gases or particles, comprising an elongated light transmitting tube having opposite end portions, a set of end closure members mounted on said end portions of said tube, reflector means disposed within said tube and having a light reflecting surface, means located on one of said end closure members and supporting a lamp element within said tube, at least one of said end closure members including means defining a gap providing for the release of pressurized gas within said tube, and said gap defining means forming a path which abruptly changes the direction of the gas flowing through said gap for extinguishing any flame within the gas.
A light fixture adapted for use in an environment of flammable gases or materials, comprising metal body means supporting a light transmitting member and cooperating therewith to define an enclosed chamber, reflector means disposed within said chamber and having a light refecting surface, a lamp element spaced within said chamber generally between said light transmitting member and said light reflecting surface, said body means defining a gap providing for the release of pressurized gas from said chamber, and said gap forming a path which abruptly changes the direction of the gas flowing through said gap for extinguishing any flame within the gas.
Dependencies are inferred from the claim text.