US3251987A - Refractor - Google Patents
Refractor Download PDFInfo
- Publication number
- US3251987A US3251987A US322563A US32256363A US3251987A US 3251987 A US3251987 A US 3251987A US 322563 A US322563 A US 322563A US 32256363 A US32256363 A US 32256363A US 3251987 A US3251987 A US 3251987A
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- United States
- Prior art keywords
- prisms
- corridor
- light
- refractor
- cut
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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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-
- 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
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/10—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages characterised by specific fastening means or way of fastening
- F21V17/18—Latch-type fastening, e.g. with rotary action
-
- 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
Definitions
- This invention relates to luminaires, and more particularly to a refractor for use in a luminaire.
- the luminaire described herein uses fluorescent lamps and may be used to illuminate building corridors, although it could also be used in other areas where a unit of similar output and distribution is required.
- the object of this invention is to provide and improved refractor for use in a corridor or the like.
- FIG. 1a is a cross section of the unit
- FIG. 1b is an end view of the unit
- FIG. 2 is a side elevation of the unit
- FIG. 3 is a cross section at the end of the unit
- FIG. 4 is a plan view of the latch
- FIG. 5 is a large scale cross section of the optical system
- FIG. 6 is a fragmentary plan of the bottom prism
- FIG. 7 is a section 7--7 of FIG. 5;
- FIG. 8 is a candle power curve of the unit
- the luminaire consists of a plastic refractor 1, for example, four feet in length.
- Refractor 1 is held to a fixture 2 by means of latches 3 and hinge lugs 4.
- the fixture 2 consists of a channel member 5, which can be of four feet or eight feet lengths. This channel is capped by end plates 6 which carry lamp sockets 7 and provide a means 8 for supporting a channel cover strip 9. Ballast equipment for operating the lamp 10 is shown at 11.
- Access to the lamp is obtained by rotating the latches 3 as shown in FIG. 4 until the fingers 12 clear the flange 13.
- the refractor can then swing open by pivoting on the lugs 4.
- the refractor can also then be removed if desired by simply lifting it off the lugs.
- Curve A is the distribution in a plane transverse of the corridor while curve B is in a plane along the corridor.
- Cut-off prisms 20 extend transversely across the face of refractor 1, as shown in FIG. 5, and form with their surfaces a series of peaks with valleys therebetween. These prisms prevent glare light being emitted in directions along the corridor, but they modify the light rays very slightly in transverse directions, as shown by rays 22, 22", 23, 23", 24, 24 and 25, 25".
- another set of refracting prisms described generally as 26 extend longitudinally through the transverse cut-off prisms 20. These prisms 26 concentrate the light as shown by rays 22, 22, 23, 23', 24, 24 and 25, 25'.
- the deeper prisms, such as prisms 27 and 28 have their own cut-ofi action in longitudinal directions (see Rolph Pat. No. 2,648,763).
- the more shallow prisms 29, near the nodal point 30, have little or no cut-off action, and could therefore emit light up to the horizontal in directions along the corridor. This undesirable feature is avoided in this design by locating these prisms at a controlled depth in the 3,251,987 Patented May 17, 1966 However for the transverse light distribution required,
- the side panels 40 of refractor I carry vertical cutoff prisms 41 on their outer faces and longitudinal refracting prisms 42 on their inner faces.
- the lower face 43 of prisms 42 refract the incident light upwardly as shown by typical ray 44-44 while the upper face 45 refracts the incident light downwardly as shown by typical ray 46-46.
- the upper horizontal flange 13 carries prisms 50 which direct the incident light upward to light the sides of channel 5 and the immediate ceiling area.
- a refractor for use with a line source of light mounted on a ceiling of a corridor or the like comprising a plurality of transverse cut-off prism means for internally reflecting high angled light which would otherwise be emitted at glare angles in the direction of said corridor, said prism means being formed of surfaces defining peaks and valleys, a plurality of refracting prisms extending longitudinally through said transverse prisms, some of said refracting prisms comprising shallow prisms lying in planes at a predetermined depth and inwardly of the peaks of said prism means, said cut-off prism means further comprising means for shielding light emitted by said shallow prisms approaching the horizontal in the direction of said corridor.
- a refractor for use with a linear light source mounted on a ceiling of a corridor orthe like comprising a light emergent surface, a plurality of transversely oriented cut-off prisms formed on said light emergent surface, said cut-off prisms including means for internally reflecting high angled light along the corridor, a plurality of refracting prisms also formed on said light emergent surfaces, and extending in the direction of the corridor and through said transverse prisms, some of said refracting prisms being shallower than said transverse cut-off prisms, whereby said cut-oft" prisms constitute means for slereding near horizontal light emitted by said shallow prisms in the direction of the corridor.
- Refractor means for receiving and transmitting light from a light source, said refractor means comprising a light emergent surface elongated in a first direction, a plurality of first prisms on said light emergent surface and extending in a second direction transversely relative to said first direction, said first prisms being defined by surfaces converging outwardly into peaks with alleys therebetween, a plurality of second prisms on said light emergent sur face and including active surfaces extending in said first direction and superimposed on said surfaces of said first prisms between the peaks thereof, said active surfaces including means for redirecting light in said second direction transversely of said first direction and for emitting some light in said first direction at glare angles in paths close to said emergent surface, at least some of said second prisms extending entirely in planes inwardly to the peaks of said first prisms, said first prisms comprising means for shielding the light emitted in said first direction at said glare angles by said some of said second prisms
- first prisms further comprise means for internally reflecting light which would otherwise be emitted in said first direction at glare angles.
- a reiractor as recited'in claim 4 wherein said some of said second prisms are disposed at varying depths between the peaks of said first prisms and the others of said second prisms lie in paths on either side of said some of said second prisms.
- a refractor as recited in claim 5, wherein said light emergent surface comprises two symmetrical portions extending in said first direction on either side of a longitudinal center line, each of said symmetrical portions having said some of said second prisms disposed at varying 4 others of said second prisms lying in paths on either side of said some of said second prisms.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Description
May 17, 1966 v. s. WINCE REFRACTOR Filed Nov. 8, 1963 Tlclo- 3 Sheets-Sheet l INVENTOR ATTO N EYS V. S. WINCE May 17, 1966 REFRACTOR 3 Sheets-Sheet 2 Filed Nov. 8, 1963 y 1966 v. s. WINCE 3,251,987
REFRACTOR Filed Nov. 8, 1963 50 3 Sheets-Sneet 5 INVENTOR kffiPL S. l l m cs avymq y ATTORNEYS United States Patent ice 3,251,987 REFRACTOR Vearl S. Wince, Newark, Ohio, assignor to Holophane Company, Inc;, a corporation of Delaware Filed Nov. 8, 1963, Ser. No. 322,563
- 6 Claims. (Cl. 240106) This invention relates to luminaires, and more particularly to a refractor for use in a luminaire.
The luminaire described herein uses fluorescent lamps and may be used to illuminate building corridors, although it could also be used in other areas where a unit of similar output and distribution is required.
In lighting corridors, it is not only desirable to illuminate people and objects in the corridor, but also to delineate the corridor itself by directing light to the walls, ceiling and floor. At the same time,-brightnes of the unit must be at a comfortable level, not only along the corridor, but also across the corridor, since some occupants will at times be facing that direction through open doorways or in work areas along the corridor.
Accordingly, the object of this invention is to provide and improved refractor for use in a corridor or the like.
In the attached drawings:
FIG. 1a is a cross section of the unit;
FIG. 1b is an end view of the unit;
FIG. 2 is a side elevation of the unit;
FIG. 3 is a cross section at the end of the unit;
FIG. 4 is a plan view of the latch;
FIG. 5 is a large scale cross section of the optical system;
FIG. 6 is a fragmentary plan of the bottom prism;
FIG. 7 is a section 7--7 of FIG. 5;
FIG. 8 is a candle power curve of the unit;
In detail, the luminaire consists of a plastic refractor 1, for example, four feet in length. Refractor 1 is held to a fixture 2 by means of latches 3 and hinge lugs 4.
The fixture 2 consists of a channel member 5, which can be of four feet or eight feet lengths. This channel is capped by end plates 6 which carry lamp sockets 7 and provide a means 8 for supporting a channel cover strip 9. Ballast equipment for operating the lamp 10 is shown at 11.
Access to the lamp is obtained by rotating the latches 3 as shown in FIG. 4 until the fingers 12 clear the flange 13. The refractor can then swing open by pivoting on the lugs 4. The refractor can also then be removed if desired by simply lifting it off the lugs.
The desired candlepower distribution curves are shown in FIG. 8. Curve A is the distribution in a plane transverse of the corridor while curve B is in a plane along the corridor.
Cut-off prisms 20 extend transversely across the face of refractor 1, as shown in FIG. 5, and form with their surfaces a series of peaks with valleys therebetween. These prisms prevent glare light being emitted in directions along the corridor, but they modify the light rays very slightly in transverse directions, as shown by rays 22, 22", 23, 23", 24, 24 and 25, 25".
To obtain the candlepower curve A, another set of refracting prisms described generally as 26 extend longitudinally through the transverse cut-off prisms 20. These prisms 26 concentrate the light as shown by rays 22, 22, 23, 23', 24, 24 and 25, 25'. The deeper prisms, such as prisms 27 and 28 have their own cut-ofi action in longitudinal directions (see Rolph Pat. No. 2,648,763). However, the more shallow prisms 29, near the nodal point 30, have little or no cut-off action, and could therefore emit light up to the horizontal in directions along the corridor. This undesirable feature is avoided in this design by locating these prisms at a controlled depth in the 3,251,987 Patented May 17, 1966 However for the transverse light distribution required,
the arrangement shown in FIG. 5 is satisfactory.
The side panels 40 of refractor I carry vertical cutoff prisms 41 on their outer faces and longitudinal refracting prisms 42 on their inner faces. The lower face 43 of prisms 42 refract the incident light upwardly as shown by typical ray 44-44 while the upper face 45 refracts the incident light downwardly as shown by typical ray 46-46.
The upper horizontal flange 13 carries prisms 50 which direct the incident light upward to light the sides of channel 5 and the immediate ceiling area.
Although a specific embodiment of the invention has been described, the invention is not so limited and should only be defined by the following claims.
What is claimed is:
1. A refractor for use with a line source of light mounted on a ceiling of a corridor or the like, comprising a plurality of transverse cut-off prism means for internally reflecting high angled light which would otherwise be emitted at glare angles in the direction of said corridor, said prism means being formed of surfaces defining peaks and valleys, a plurality of refracting prisms extending longitudinally through said transverse prisms, some of said refracting prisms comprising shallow prisms lying in planes at a predetermined depth and inwardly of the peaks of said prism means, said cut-off prism means further comprising means for shielding light emitted by said shallow prisms approaching the horizontal in the direction of said corridor.
2. A refractor for use with a linear light source mounted on a ceiling of a corridor orthe like, comprising a light emergent surface, a plurality of transversely oriented cut-off prisms formed on said light emergent surface, said cut-off prisms including means for internally reflecting high angled light along the corridor, a plurality of refracting prisms also formed on said light emergent surfaces, and extending in the direction of the corridor and through said transverse prisms, some of said refracting prisms being shallower than said transverse cut-off prisms, whereby said cut-oft" prisms constitute means for sliileding near horizontal light emitted by said shallow prisms in the direction of the corridor.
3. Refractor means for receiving and transmitting light from a light source, said refractor means comprising a light emergent surface elongated in a first direction, a plurality of first prisms on said light emergent surface and extending in a second direction transversely relative to said first direction, said first prisms being defined by surfaces converging outwardly into peaks with alleys therebetween, a plurality of second prisms on said light emergent sur face and including active surfaces extending in said first direction and superimposed on said surfaces of said first prisms between the peaks thereof, said active surfaces including means for redirecting light in said second direction transversely of said first direction and for emitting some light in said first direction at glare angles in paths close to said emergent surface, at least some of said second prisms extending entirely in planes inwardly to the peaks of said first prisms, said first prisms comprising means for shielding the light emitted in said first direction at said glare angles by said some of said second prisms.
5. A reiractor as recited'in claim 4, wherein said some of said second prisms are disposed at varying depths between the peaks of said first prisms and the others of said second prisms lie in paths on either side of said some of said second prisms.
6. A refractor as recited in claim 5, wherein said light emergent surface comprises two symmetrical portions extending in said first direction on either side of a longitudinal center line, each of said symmetrical portions having said some of said second prisms disposed at varying 4 others of said second prisms lying in paths on either side of said some of said second prisms.
References Cited by the Examiner UNITED STATES PATENTS 2,280,160 4/ 1942 Rolph et a1. 240106 2,474,317 6/ 1949 McPhail 240-106 2,814,723 11/1957 Franck et a1. 240106 NORTON ANSHER, Primary Examiner.
EVON C. BLURK, Examiner.
depths between the peaks of said first prisms, and the 15 CHA E RHODES, Assistdnt x miner- Wakefield et a1. 240-106 X
Claims (1)
1. A REFRACTOR FOR USE WITH A LINE SOURCE OF LIGHT MOUNTED ON A CEILING OF A CORRIDOR OR THE LIKE, COMPRISING A PLURALITY OF TRANSVERSE CUT-OFF PRISM MEANS FOR INTERNALLY REFLECTING HIGH ANGLED LIGHT WHICH WOULD OTHERWISE BE EMITTED AT GLARE ANGLES IN THE DIRECTION OF SAID CORRIDOR, SAID PRISM MEANS BEING FORMED OF SURFACES DEFINING PEAKS AND VALLEYS, A PLURALITY OF REFRACTING PRISMS EXTENDING LONGITUDINALLY THROUGH SAID TRANSVERSE PRISMS, SOME OF SAID REFRACTING PRIMS COMPRISING SHALLOW PRISMS LYING IN PLANES AT A PREDETERMINED DEPTH AND INWARDLY OF THE PEAKS OF SAID PRISMS MEANS, SAID CUT-OFF PRISM MEANS FURTHER COMPRISING MEANS FOR SHIELDING LIGHT EMITTED BY SAID SHALLOW PRISMS APPROACHING THE HORIZONTAL IN THE DIRECTION OF SAID CORRIDOR.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US322563A US3251987A (en) | 1963-11-08 | 1963-11-08 | Refractor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US322563A US3251987A (en) | 1963-11-08 | 1963-11-08 | Refractor |
Publications (1)
Publication Number | Publication Date |
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US3251987A true US3251987A (en) | 1966-05-17 |
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ID=23255431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US322563A Expired - Lifetime US3251987A (en) | 1963-11-08 | 1963-11-08 | Refractor |
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Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3936671A (en) * | 1974-08-12 | 1976-02-03 | Emerson Electric Co. | Illumination system |
US4053762A (en) * | 1975-12-29 | 1977-10-11 | Armstrong Cork Company | Twin-beam luminaire lens |
US4559587A (en) * | 1983-11-17 | 1985-12-17 | Harvey Hubbell Incorporated | Wall mounted luminaire |
US4803608A (en) * | 1985-12-19 | 1989-02-07 | Duracell Inc. | Rear lights for bicycles and other vehicles |
US5175135A (en) | 1987-11-23 | 1992-12-29 | The Dow Chemical Company | Alkylation of aromatic compounds to alkylates enriched in the linear substituted isomers |
US5274536A (en) * | 1991-07-02 | 1993-12-28 | Kabushiki Kaisha Mochiro Kikaku | Illumination cover for fluorescent lamp |
US5309341A (en) * | 1992-10-23 | 1994-05-03 | The Genlyte Group Incorporated | Light fixture with a reversible lens with adjustable brackets |
US20070147031A1 (en) * | 2004-06-10 | 2007-06-28 | Claude Barozzini | Garage Light Luminaire with Circular Compact Fluorescent Emergency Lighting Optics |
US7296914B1 (en) | 2004-03-03 | 2007-11-20 | Genlyte Thomas Group, Llc | Multiple position luminaire |
US20080101075A1 (en) * | 2002-06-05 | 2008-05-01 | Genlyte Thomas Group, Llc | Indirector Light Fixture |
US20080137351A1 (en) * | 2006-06-19 | 2008-06-12 | Genlyte Thomas Group, Llc | Traditional Style Post-Top Luminaire with Relamping Module and Method |
US7422350B2 (en) | 2006-06-19 | 2008-09-09 | Genlyte Thomas Group, Llc | Pendent style luminaire split design |
US20080219008A1 (en) * | 2007-03-06 | 2008-09-11 | Canlyte Inc. | Lighting Device with Composite Reflector |
US20080232111A1 (en) * | 2007-02-28 | 2008-09-25 | Canlyte Inc. | Low Up-Light Cutoff Acorn Style Luminaire |
USD652557S1 (en) | 2010-08-18 | 2012-01-17 | Koninklijke Philiips Electronics N.V. | Luminaire for road lighting |
USD652978S1 (en) | 2010-08-18 | 2012-01-24 | Koninklijke Philips Electronics N.V. | Luminaire for road lighting |
JP2013214422A (en) * | 2012-04-02 | 2013-10-17 | Endo Lighting Corp | Translucent cover for illumination lamp, and straight tube type illumination lamp |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2280160A (en) * | 1940-10-10 | 1942-04-21 | Holophane Co Inc | Luminaire |
US2474317A (en) * | 1949-06-28 | Light refracting and transmitting | ||
US2814723A (en) * | 1955-04-04 | 1957-11-26 | Holophane Co Inc | Luminaires |
US3159352A (en) * | 1960-11-16 | 1964-12-01 | Wakefield Corp | Luminaire |
-
1963
- 1963-11-08 US US322563A patent/US3251987A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2474317A (en) * | 1949-06-28 | Light refracting and transmitting | ||
US2280160A (en) * | 1940-10-10 | 1942-04-21 | Holophane Co Inc | Luminaire |
US2814723A (en) * | 1955-04-04 | 1957-11-26 | Holophane Co Inc | Luminaires |
US3159352A (en) * | 1960-11-16 | 1964-12-01 | Wakefield Corp | Luminaire |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3936671A (en) * | 1974-08-12 | 1976-02-03 | Emerson Electric Co. | Illumination system |
US4053762A (en) * | 1975-12-29 | 1977-10-11 | Armstrong Cork Company | Twin-beam luminaire lens |
US4559587A (en) * | 1983-11-17 | 1985-12-17 | Harvey Hubbell Incorporated | Wall mounted luminaire |
US4803608A (en) * | 1985-12-19 | 1989-02-07 | Duracell Inc. | Rear lights for bicycles and other vehicles |
US5175135A (en) | 1987-11-23 | 1992-12-29 | The Dow Chemical Company | Alkylation of aromatic compounds to alkylates enriched in the linear substituted isomers |
US5274536A (en) * | 1991-07-02 | 1993-12-28 | Kabushiki Kaisha Mochiro Kikaku | Illumination cover for fluorescent lamp |
US5309341A (en) * | 1992-10-23 | 1994-05-03 | The Genlyte Group Incorporated | Light fixture with a reversible lens with adjustable brackets |
US7575336B2 (en) | 2002-06-05 | 2009-08-18 | Genlyte Thomas Group Llc | Indirector light fixture |
US20080101075A1 (en) * | 2002-06-05 | 2008-05-01 | Genlyte Thomas Group, Llc | Indirector Light Fixture |
US7547117B1 (en) | 2004-03-03 | 2009-06-16 | Genlyte Thomas Group Llc | Multiple position luminaire and bracket |
US7296914B1 (en) | 2004-03-03 | 2007-11-20 | Genlyte Thomas Group, Llc | Multiple position luminaire |
US7374310B2 (en) | 2004-06-10 | 2008-05-20 | Genlyte Thomas Group, Llc | Garage light luminaire with circular compact fluorescent emergency lighting optics |
US20070147031A1 (en) * | 2004-06-10 | 2007-06-28 | Claude Barozzini | Garage Light Luminaire with Circular Compact Fluorescent Emergency Lighting Optics |
US7422350B2 (en) | 2006-06-19 | 2008-09-09 | Genlyte Thomas Group, Llc | Pendent style luminaire split design |
US7510307B2 (en) | 2006-06-19 | 2009-03-31 | Genlyte Thomas Group Llc | Traditional style post-top luminaire with relamping module and method |
US20080137351A1 (en) * | 2006-06-19 | 2008-06-12 | Genlyte Thomas Group, Llc | Traditional Style Post-Top Luminaire with Relamping Module and Method |
US20080232111A1 (en) * | 2007-02-28 | 2008-09-25 | Canlyte Inc. | Low Up-Light Cutoff Acorn Style Luminaire |
US7946734B2 (en) | 2007-02-28 | 2011-05-24 | Philips Electronics Ltd | Low up-light cutoff acorn style luminaire |
US20080219008A1 (en) * | 2007-03-06 | 2008-09-11 | Canlyte Inc. | Lighting Device with Composite Reflector |
US7712929B2 (en) | 2007-03-06 | 2010-05-11 | Canlyte Inc. | Lighting device with composite reflector |
USD652557S1 (en) | 2010-08-18 | 2012-01-17 | Koninklijke Philiips Electronics N.V. | Luminaire for road lighting |
USD652978S1 (en) | 2010-08-18 | 2012-01-24 | Koninklijke Philips Electronics N.V. | Luminaire for road lighting |
JP2013214422A (en) * | 2012-04-02 | 2013-10-17 | Endo Lighting Corp | Translucent cover for illumination lamp, and straight tube type illumination lamp |
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