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

• Current Assignee: Yoshiro Nakamats
• Original Assignee: Yoshiro Nakamats
• Inventors: NakaMats, Yoshiro
• Primary Examiner(s): Ostrager, Allen M.
• Assistant Examiner(s): Cole: Richard R.
• Application Number:
  US07/449,681
• Time in Patent Office: 434 Days
• Field of Search: 362/282, 362/322, 362/294, 362/373, 362/410
• US Class Current: 362/282
• CPC Class Codes: F21S 6/003 for task lighting, e.g. for reading or desk work, e.g. angle poise lamps
• CPC Class Codes: F21V 14/04 by movement of reflectors in vehicle head lamps F21S41/675
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083

Abstract

A lighting device includes a hollow body having a cylindrical portion and a closure portion, a light source being mounted within the body longitudinally inwardly of an open end of the cylindrical portion and located above the inclined surface of the closure portion. A reflector is movably mounted in a position spaced from the open end of the cylindrical portion and generally aligned with the longitudinal axis of the cylindrical portion such that the light radiated from the light source means passes to the reflector to be reflected by the reflector. Ventilation openings are provided in the inclined surface of the closure portion for admitting a flow of ambient air into the body below the light source, the light source heating the air admitted into the body such that the heated air flows generally longitudinally in the body to exit upwardly from the open end of the cylindrical portion as further ambient air is drawn into the body below the light source through the ventilation openings, whereby the lighting device is cooled by the flow of air upwardly through said body.

Claims

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.

2. A lighting device according to claim 1, wherein said extending section has a first sloping portion extending from said fastening section at a first angle relative to said longitudinal axis, said first sloping portion extending increasingly radially outwardly of said longitudinal axis at increasing distance from said open end of said cylindrical portion of said body, said extending section having a second sloping portion extending from said first sloping portion at a second angle relative to said longitudinal axis, said second sloping portion extending increasingly radially outwardly of said longitudinal axis at increasing distances from said open end of said cylindrical portion of said body, said first angle being different from said second angle.

3. A lighting device according to claim 2, wherein said first angle is greater than said second angle.

4. A lighting device according to claim 2, wherein said reflecting means comprises a mirror means and a frame pivotably supporting said mirror means, said frame being connected to said second sloping portion and extending increasingly radially inwardly of said longitudinal axis at increasing distances from said open end of said cylindrical portion of said body.