GB298447A - Improvements in and relating to illuminating appliances - Google Patents
Improvements in and relating to illuminating appliancesInfo
- Publication number
- GB298447A GB298447A GB10053/28A GB1005328A GB298447A GB 298447 A GB298447 A GB 298447A GB 10053/28 A GB10053/28 A GB 10053/28A GB 1005328 A GB1005328 A GB 1005328A GB 298447 A GB298447 A GB 298447A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- light
- rays
- bottom plate
- ceiling
- 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
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
298,447. Stephens, A. J., (Rolph, T. W.). April 3, 1928. Ceiling lamps.-A lens element 2 surrounding the light source 1 reduces the divergence of the light in vertical planes and an enclosing globe comprises a reflector 3 which directs the light vertically on to a bottom plate 4 for distribution. the upper part of the reflector having a light transmitting portion. The lens 2 of cup shape with a prismatic outer surface is held in place against a ledge 14 on the reflector by a, spring 11 and the bottom plate is fastened to the reflector by clips 12. On its inner surface the reflector 3 is of prismatic form giving downward reflection of typical rays C, D and the bottom plate may be constructed as described in Specification 258,482. [Class 75 (ii), Lamp chimneys &c.], to distribute the light uniformly as at C<1>, D'. Light directed upon the bottom of the cup as at G, H is refracted downwardly and distributed at G<1>, H<1>. Rays such as A, B, falling upon the upper portion of the globe are transmitted towards the ceiling while rays such as E, F falling upon reflecting prism between the points 6, 9 on the cup are directed towards the reflector 3 at such angles that they are transmitted upwardly by the prisms of the reflector and add to the illumination of the ceiling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB10053/28A GB298447A (en) | 1928-04-03 | 1928-04-03 | Improvements in and relating to illuminating appliances |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB10053/28A GB298447A (en) | 1928-04-03 | 1928-04-03 | Improvements in and relating to illuminating appliances |
Publications (1)
Publication Number | Publication Date |
---|---|
GB298447A true GB298447A (en) | 1928-10-11 |
Family
ID=9960577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10053/28A Expired GB298447A (en) | 1928-04-03 | 1928-04-03 | Improvements in and relating to illuminating appliances |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB298447A (en) |
-
1928
- 1928-04-03 GB GB10053/28A patent/GB298447A/en not_active Expired
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