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Movable reflecting ray transmitter

  • US 4,994,946 A
  • Filed: 12/12/1989
  • Issued: 02/19/1991
  • Est. Priority Date: 11/15/1986
  • Status: Expired due to Term
First Claim
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1. A lighting device comprising a hollow body having a cylindrical portion and a closure portion, said cylindrical portion having a longitudinal vertical axis, one longitudinal end of said cylindrical portion being open, said closure portion having a closed end, an open end joined to the other end of said cylindrical portion, and a surface inclined radially inwardly from said open end to said closed end of said closure portion, a light source means mounted within said body longitudinally inwardly of said open end of said cylindrical portion including a light bulb located above the inclined surface of said closure portion, mounting means mounted on said body and extending externally of said body, reflecting means movably mounted on said mounting means in a position spaced from said open end of said cylindrical portion and generally aligned with said longitudinal axis of said cylindrical portion such that the light radiated from said light bulb passes to said reflecting means to be reflected by said reflecting means, and ventilation means in said inclined surface of said closure portion disposed below said light bulb for admitting a flow of ambient air into said body below said light bulb, said light bulb heating the air admitted into said body such that said heated air flows generally longitudinally in said body to exit upwardly from said open end of said cylindrical portion as further ambient air is drawn into said body below said light bulb through said ventilation means, whereby the lighting device is cooled by said flow of air upwardly through said body, said ventilation means comprising a plurality of spaced openings in said inclined surface of said closure portion, said body and said ventilation means being constructed and arranged to provide a chimney effect for air flow from said ventilation means to said open end of said cylindrical portion of said body when heated by said light bulb, said mounting means comprising arm means and fastening means fastening said arm means to said cylindrical portion, said arm means having a fastening section extending into said cylindrical portion, said fastening means fastening said fastening section to the inside of said cylindrical portion, said arm means having an extending section extending from said fastening section, said extending section extending in a direction generally radially outwardly of said cylindrical portion of said body such that said extending section is disposed outside the path of air flowing from said open end of said cylindrical portion.

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