GB489010A - Improvements in and relating to luminairs - Google Patents

Improvements in and relating to luminairs

Info

Publication number
GB489010A
GB489010A GB26491/36A GB2649136A GB489010A GB 489010 A GB489010 A GB 489010A GB 26491/36 A GB26491/36 A GB 26491/36A GB 2649136 A GB2649136 A GB 2649136A GB 489010 A GB489010 A GB 489010A
Authority
GB
United Kingdom
Prior art keywords
prisms
bowl
light
concentric
envelope
Prior art date
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
Application number
GB26491/36A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Holophane Ltd
Original Assignee
Holophane Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Holophane Ltd filed Critical Holophane Ltd
Publication of GB489010A publication Critical patent/GB489010A/en
Expired legal-status Critical Current

Links

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
    • F21V5/00—Refractors for light sources

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

489,010. Suspended lamps. HOLOPHANE, Ltd. Sept. 30, 1936, No. 26491. Void. Convention date, Oct. 2, 1935. [Class 75 (ii)] A light-transmitting globe or bowl, adapted to intercept light emitted from a source in a hemisphere, comprises a spherical portion surrounded by an annular dished portion which intercepts the more widely divergent light and is so shaped as to transmit and deviate said light towards the axis of the bowl. This bowl may be fitted with a reflecting cover of a similar shape so as to form an envelope in the shape of a sphere circumscribed by a projecting ring which is wedgeshaped in radial cross-section. The bowl may be made of diffusing glass, or it may be formed with refracting prisms, whilst the cover may be made of diffusing glass or it may be opaque or formed with reflecting prisms. The projecting ring may be horizontal or inclined, and the axis of the light source may be vertical or coincident with the optical axis of the envelope. The Figure shows a two-part prismatic glass envelope comprising spherical segments 74, 75 and projecting parts 76, 77, The segment 74 is formed on its inner or outer surface with concentric refracting prisms and on its outer or inner surface with radial or parallel prisms. The segment 75 is formed with reflecting prisms which return the rays to the light source 70. The section 76 is formed on its inner surface with concentric prisms of the refracting or single-reflection type, and on its outer surface with laterally spreading or like prisms. The section 77 is formed with concentric or radial prisms. Specification 412,053 is referred to.
GB26491/36A 1935-10-02 1936-09-30 Improvements in and relating to luminairs Expired GB489010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US489010XA 1935-10-02 1935-10-02

Publications (1)

Publication Number Publication Date
GB489010A true GB489010A (en) 1938-07-18

Family

ID=21957047

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26491/36A Expired GB489010A (en) 1935-10-02 1936-09-30 Improvements in and relating to luminairs

Country Status (1)

Country Link
GB (1) GB489010A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232757A (en) * 1989-06-09 1990-12-19 Starlowe Lighting & Design Lim A cover for light fittings
GR900100075A (en) * 1990-02-07 1992-06-30 Euthumios G Ioannidis Decorative luminous little ball

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232757A (en) * 1989-06-09 1990-12-19 Starlowe Lighting & Design Lim A cover for light fittings
GR900100075A (en) * 1990-02-07 1992-06-30 Euthumios G Ioannidis Decorative luminous little ball

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