GB492100A - Improvements in lighting fittings - Google Patents
Improvements in lighting fittingsInfo
- Publication number
- GB492100A GB492100A GB715737A GB715737A GB492100A GB 492100 A GB492100 A GB 492100A GB 715737 A GB715737 A GB 715737A GB 715737 A GB715737 A GB 715737A GB 492100 A GB492100 A GB 492100A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- aperture
- main reflector
- bulb
- upwardly
- 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
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
Abstract
492,100. Overhead electric lamps. CAMPELL, G., and BENJAMIN ELECTRIC, Ltd. March 11, 1937, No. 7157. [Classes 75 (ii) and 75 (iv)] In an overhead electric lamp comprising a main reflector 10, having an aperture 11 at the top, and a subsidiary reflector 25 below a downwardly suspended electric lamp bulb 24, the reflectors are so arranged that substantially all the light is directed into the main reflector for downward indirect lighting except that portion which passes directly from the source 24 or the reflector 25 upwardly through the aperture 11 and through the space between this aperture and the lower end of a neck member 12, this portion of the light providing without further reflection, direct lighting above the main reflector. The space between the aperture 11 and the neck 12 is filled by an upwardly tapering ring 21 of opal glass. The subsidiary reflector 25 may be constituted by a specular coating on the bulb 24, or, as shown, by a hemispherical cup which is either secured to the bulb by wire clips 26 or supported in close contact therewith by an arm 27, Fig. 3, which is pivoted to a bracket 29 on the main reflector 10 and is urged upwardly by a spring 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB715737A GB492100A (en) | 1937-03-11 | 1937-03-11 | Improvements in lighting fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB715737A GB492100A (en) | 1937-03-11 | 1937-03-11 | Improvements in lighting fittings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB492100A true GB492100A (en) | 1938-09-12 |
Family
ID=9827695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB715737A Expired GB492100A (en) | 1937-03-11 | 1937-03-11 | Improvements in lighting fittings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB492100A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2723145A1 (en) * | 1977-05-23 | 1978-11-30 | Hoffmeister Leuchten Kg | Reflector assembly for narrow beam lamp - uses parabolic main reflector and has axially adjustable auxiliary reflector positioned in front of bulb |
| DE2831622A1 (en) * | 1978-01-30 | 1979-08-02 | Max Laser | REFLECTOR ARRANGEMENT |
-
1937
- 1937-03-11 GB GB715737A patent/GB492100A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2723145A1 (en) * | 1977-05-23 | 1978-11-30 | Hoffmeister Leuchten Kg | Reflector assembly for narrow beam lamp - uses parabolic main reflector and has axially adjustable auxiliary reflector positioned in front of bulb |
| DE2831622A1 (en) * | 1978-01-30 | 1979-08-02 | Max Laser | REFLECTOR ARRANGEMENT |
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