GB762769A - Improvements relating to refractors for street lighting lanterns - Google Patents

Improvements relating to refractors for street lighting lanterns

Info

Publication number
GB762769A
GB762769A GB28631/53A GB2863153A GB762769A GB 762769 A GB762769 A GB 762769A GB 28631/53 A GB28631/53 A GB 28631/53A GB 2863153 A GB2863153 A GB 2863153A GB 762769 A GB762769 A GB 762769A
Authority
GB
United Kingdom
Prior art keywords
prisms
refractor
light
street lighting
refractors
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
GB28631/53A
Inventor
Richard William Stevens
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical Co 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB28631/53A priority Critical patent/GB762769A/en
Publication of GB762769A publication Critical patent/GB762769A/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
    • F21V5/02—Refractors for light sources of prismatic shape

Landscapes

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

Abstract

762,769. Street lighting refractors. METROPOLITAN - VICKERS ELECTRICAL CO., Ltd. Oct. 20, 1954 [Oct. 16, 1953], No. 28631/53. Classes 75(2) and 75(4) A street lighting refractor 'provided on a surface with a plurality of prisms has the prisms 6<SP>11</SP> over at least a portion of the total arc covered by the refractor, particularly those receiving upwardly directed light which are' required both to reflect and refract the light downwardly spaced at their bases to an extent such as to avoid interception by one prism of the path of light emanating, in use, from the source and passing through an adjacent prism. Relatively small prisms 7 are provided between the main prisms 6" to reflect back towards the interior of the lantern light, e.g. upwardly directed, which would otherwise pass through the refractor between the main prisms and in the case where the prisms are on the side of the refractor away from the light source, the prisms 7 may be double reflecting right-angled prisms. The refractor may in the form of a bowl or trough-shaped portion for a lantern body or of a skirt portion for an open type lantern body and may be of glass or " Perspex " (Registered Trade Mark) or particularly, moulded from " Diakon " (Registered Trade Mark). The refractor described forms the skirt of a globe and is provided at its upper end with an inturned flange for securing by screws to bosses on a cap or canopy, e.g. of aluminium.
GB28631/53A 1953-10-16 1953-10-16 Improvements relating to refractors for street lighting lanterns Expired GB762769A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB28631/53A GB762769A (en) 1953-10-16 1953-10-16 Improvements relating to refractors for street lighting lanterns

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28631/53A GB762769A (en) 1953-10-16 1953-10-16 Improvements relating to refractors for street lighting lanterns

Publications (1)

Publication Number Publication Date
GB762769A true GB762769A (en) 1956-12-05

Family

ID=10278649

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28631/53A Expired GB762769A (en) 1953-10-16 1953-10-16 Improvements relating to refractors for street lighting lanterns

Country Status (1)

Country Link
GB (1) GB762769A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178019A1 (en) * 1984-10-09 1986-04-16 Koninklijke Philips Electronics N.V. Illumination unit
WO1996027757A1 (en) * 1995-03-03 1996-09-12 Minnesota Mining And Manufacturing Company Light directing film having variable height structured surface and light directing article constructed therefrom
US5631994A (en) * 1995-08-23 1997-05-20 Minnesota Mining And Manufacturing Company Structured surface light extraction overlay and illumination system
US6456437B1 (en) 1999-01-14 2002-09-24 3M Innovative Properties Company Optical sheets suitable for spreading light

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0178019A1 (en) * 1984-10-09 1986-04-16 Koninklijke Philips Electronics N.V. Illumination unit
WO1996027757A1 (en) * 1995-03-03 1996-09-12 Minnesota Mining And Manufacturing Company Light directing film having variable height structured surface and light directing article constructed therefrom
US5771328A (en) * 1995-03-03 1998-06-23 Minnesota Mining And Manufacturing Company Light directing film having variable height structured surface and light directing article constructed therefrom
AU694619B2 (en) * 1995-03-03 1998-07-23 Minnesota Mining And Manufacturing Company Light directing film having variable height structured surface and light directing article constructed therefrom
US5631994A (en) * 1995-08-23 1997-05-20 Minnesota Mining And Manufacturing Company Structured surface light extraction overlay and illumination system
US6456437B1 (en) 1999-01-14 2002-09-24 3M Innovative Properties Company Optical sheets suitable for spreading light

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