US3596085A - Lighting fixtures - Google Patents

Lighting fixtures Download PDF

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Publication number
US3596085A
US3596085A US721758A US3596085DA US3596085A US 3596085 A US3596085 A US 3596085A US 721758 A US721758 A US 721758A US 3596085D A US3596085D A US 3596085DA US 3596085 A US3596085 A US 3596085A
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United States
Prior art keywords
light source
interior
tubular member
lighting fixture
screw
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US721758A
Inventor
Ernst Eberhardt Hansen
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Individual
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Individual
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Publication date
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Publication of US3596085A publication Critical patent/US3596085A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V1/00—Shades for light sources, i.e. lampshades for table, floor, wall or ceiling lamps
    • F21V1/14—Covers for frames; Frameless shades
    • F21V1/16—Covers for frames; Frameless shades characterised by the material
    • F21V1/22—Covers for frames; Frameless shades characterised by the material the material being plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/02—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for simulating daylight

Definitions

  • An indirect lighting fixture comprising an injection moulded tubular nontranslucent member having an internal light source at one end and screw threads formed about the interior thereof to reflect light from the source from the insides of the member and towards the light surface, the screw threads being formed during injection moulding of the member by a screw form core which is subsequently unscrewed from the member while the latter is held by the mould.
  • the present invention relates to a lighting fixture of the type which comprises a tubular member which is adapted to be mounted with a light source adjacent one end and with the light beams extending through the tube to give an indirect lighting effect.
  • the reflection of the light beams in the interior of the tubular member must be substantially suppressed so that a person who is located where he cannot see the light source has an undisturbed impression of indirect lighting.
  • FIG. 1 is a perspective view of lighting fixture according to the invention.
  • FIG. 2 is a section through the lighting fixture.
  • the lighting fixture illustrated in the drawing is in the form of a tubular member which as illustrated in FIG. 2 is adapted to be mounted in a manner not shown with a lighting source 12 at one end for example, the tubular member could be mounted in a recess in a ceiling so that the end opposite the light source only is visible.
  • the tubular member has an interior surface portion l4-of general cylindrical configuration.
  • the rest of the interior surface of the tubular member 10 is provided with a plurality of annular projections in the form. of screw heads 16 integral with the tubular member.
  • the screw threads are V-shape in cross section.
  • annular projections are so dimensioned relatively to the height and diameter of the tubular member that the light beams whichare directed against the interior wall of the tubular member only will hit the surfaces of the screw threads which face the light source.
  • the pitch of the screw threads may be approximately 2 millimeters and their radial extension 0.07 millimeter in the case of a tubular member which has an interior diameter of approximately 13 /2 centimeters and which extends approximately 13 centimeters below' the light source.
  • the screw threads provide for rational mass production of the lighting fixture with a substantial reduction of labor costs.
  • the tubular member is preferably manufactured by injection moulding in a mould in the interior of which a screw threaded core is provided and after the moulding the screw ing the unscrewing of the interior core, the tubular member is as shown provide with exterior pro ections preferably in the form of elongated axially extending ribs 18 which extend 'along a part of the length of the tubular member.
  • the mould may be constructed slightly conical so as to provide a slip for the moulded structure and the automatic unscrewing of the interior core may be combined with a reciprocation of the interior core so as to partly withdraw the moulded structure from the mould before the unscrewing operation is started.
  • the lighting fixture according to the invention may be manufactured of any suitable nontransparent materials, preferably ofsynthetic resin which can be injection moulded.
  • a lighting fixture in the form of a tubular opaque member having a light source at one end, characterized by the interior wall of said member having a screw thread formed about the inside surface thereof, said screw thread being V-shape in cross section whereby the side of said thread facing said light source is joined to the opposite side of the thread by an acute angle.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

An indirect lighting fixture comprising an injection moulded tubular nontranslucent member having an internal light source at one end and screw threads formed about the interior thereof to reflect light from the source from the insides of the member and towards the light surface, the screw threads being formed during injection moulding of the member by a screw form core which is subsequently unscrewed from the member while the latter is held by the mould.

Description

United States Patent 2,514,486 7/1950 Green 2,551,710 5/1951 Slaughter 240/108 (X) 2,773,172 12/1956 Pennou 240/106 (X) 3,253,276 5/1966 Nagel 240/106 (X) FOREIGN PATENTS 164,141 6/1954 Australia 240/106 1,181,145 11/1964 Germany 240/108 Primary Examiner- Samuel S. Matthews Assistant ExaminerRichard L. Moses Attorney-Watts, Hoffmann, Fisher and Heinke ABSTRACT: An indirect lighting fixture comprising an injection moulded tubular nontranslucent member having an internal light source at one end and screw threads formed about the interior thereof to reflect light from the source from the insides of the member and towards the light surface, the screw threads being formed during injection moulding of the member by a screw form core which is subsequently unscrewed from the member while the latter is held by the mould.
PATENTEU .1112 7 I911 MT Au-M BY M, 4
ATTORNEY INVENTOR mud-w LIGHTING FIXTURES The present invention relates to a lighting fixture of the type which comprises a tubular member which is adapted to be mounted with a light source adjacent one end and with the light beams extending through the tube to give an indirect lighting effect.
To this purpose the reflection of the light beams in the interior of the tubular member must be substantially suppressed so that a person who is located where he cannot see the light source has an undisturbed impression of indirect lighting.
it is well known in the art to obtain this optical effect by means of a plurality of interior annular projections in the tubular member.
It is the purpose of the invention to provide a novel construction of a lighting fixture of the kind hereinbefore referred to which lends itself to rational mass production technique and enables lightning fixtures of the kind referred to to be economically manufactured.
It is a further purpose of the invention to provide amethod of manufacturing a lighting fixture of the kind referred to which is adaptable to automation.
The invention will be further described in the following with reference to the accompanying drawing, in which FIG. 1 is a perspective view of lighting fixture according to the invention, and
FIG. 2 is a section through the lighting fixture.
The lighting fixture illustrated in the drawing is in the form of a tubular member which as illustrated in FIG. 2 is adapted to be mounted in a manner not shown with a lighting source 12 at one end for example, the tubular member could be mounted in a recess in a ceiling so that the end opposite the light source only is visible.
At the end where the lighting source 12 is provided, the tubular member has an interior surface portion l4-of general cylindrical configuration. The rest of the interior surface of the tubular member 10 is provided with a plurality of annular projections in the form. of screw heads 16 integral with the tubular member. As may be seen in FIG. 2 the screw threads are V-shape in cross section.
These annular projections are so dimensioned relatively to the height and diameter of the tubular member that the light beams whichare directed against the interior wall of the tubular member only will hit the surfaces of the screw threads which face the light source.
Thereby reflections in the interior of the tubular member are avoided and a person is located so that he cannot see the light source 12 will have the impression of indirect lighting without'any disturbing reflections.
As an example of the dimensions the pitch of the screw threads may be approximately 2 millimeters and their radial extension 0.07 millimeter in the case of a tubular member which has an interior diameter of approximately 13 /2 centimeters and which extends approximately 13 centimeters below' the light source.
ln comparison with construction of the annular projections by turning on a lathe or in the form of resilient ring members, the screw threads provide for rational mass production of the lighting fixture with a substantial reduction of labor costs.
The tubular member is preferably manufactured by injection moulding in a mould in the interior of which a screw threaded core is provided and after the moulding the screw ing the unscrewing of the interior core, the tubular member is as shown provide with exterior pro ections preferably in the form of elongated axially extending ribs 18 which extend 'along a part of the length of the tubular member.
The mould may be constructed slightly conical so as to provide a slip for the moulded structure and the automatic unscrewing of the interior core may be combined with a reciprocation of the interior core so as to partly withdraw the moulded structure from the mould before the unscrewing operation is started.
It will be understood that the invention is not limited to the embodiment shown and described with reference to the drawing. Though within the scope of the invention any type of screw threads can be used, vee-threads are especially preferred because they do not leave any inwardly facing surfaces which can give rise to reflection. I
The lighting fixture according to the invention may be manufactured of any suitable nontransparent materials, preferably ofsynthetic resin which can be injection moulded.
lclaim:
l. A lighting fixture in the form of a tubular opaque member having a light source at one end, characterized by the interior wall of said member having a screw thread formed about the inside surface thereof, said screw thread being V-shape in cross section whereby the side of said thread facing said light source is joined to the opposite side of the thread by an acute angle.

Claims (1)

1. A lighting fixture in the form of a tubular opaque member having a light source at one end, characterized by the interior wall of said member having a screw thread formed about the inside surface thereof, said screw thread being V-shape in cross section whereby the side of said thread facing said light source is joined to the opposite side of the thread by an acute angle.
US721758A 1967-04-27 1968-04-16 Lighting fixtures Expired - Lifetime US3596085A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK224567AA DK113001B (en) 1967-04-27 1967-04-27 Lighting fixture and method of its manufacture.

Publications (1)

Publication Number Publication Date
US3596085A true US3596085A (en) 1971-07-27

Family

ID=8111045

Family Applications (1)

Application Number Title Priority Date Filing Date
US721758A Expired - Lifetime US3596085A (en) 1967-04-27 1968-04-16 Lighting fixtures

Country Status (5)

Country Link
US (1) US3596085A (en)
DE (2) DE6603677U (en)
DK (1) DK113001B (en)
GB (1) GB1219686A (en)
SE (1) SE329137B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936669A (en) * 1974-07-11 1976-02-03 Marton C. Gaston Beauty swag lamp
WO2019197289A1 (en) * 2018-04-10 2019-10-17 Signify Holding B.V. Decorative light source shielding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2205522A (en) * 1987-06-09 1988-12-14 Mono Pumps Ltd Moulding an article having an internal helical gear formation thereon

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936669A (en) * 1974-07-11 1976-02-03 Marton C. Gaston Beauty swag lamp
WO2019197289A1 (en) * 2018-04-10 2019-10-17 Signify Holding B.V. Decorative light source shielding
US11378250B2 (en) 2018-04-10 2022-07-05 Signify Holding B.V. Decorative light source shielding

Also Published As

Publication number Publication date
DE1299262B (en) 1969-07-17
SE329137B (en) 1970-10-05
GB1219686A (en) 1971-01-20
DK113001B (en) 1969-02-10
DE6603677U (en) 1969-11-13

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