GB275925A - Improvements in light signals - Google Patents
Improvements in light signalsInfo
- Publication number
- GB275925A GB275925A GB32975/26A GB3297526A GB275925A GB 275925 A GB275925 A GB 275925A GB 32975/26 A GB32975/26 A GB 32975/26A GB 3297526 A GB3297526 A GB 3297526A GB 275925 A GB275925 A GB 275925A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- lenses
- signal
- cover glass
- concentric
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/12—Visible signals
- B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
- B61L5/1809—Daylight signals
- B61L5/1845—Optical systems, lenses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Optical Communication System (AREA)
Abstract
275,925. Westinghouse Brake & Saxby Signal Co., Ltd., (Assignees of Wells, W. B.). Aug. 13, 1926, [Convention date]. Lenses.-In a light signal in which the light is projected in a parallel beam by means of a doublet composed of two lenses C', C<2>. concentric wedge-shaped grooves 2, 3 are formed on the outer surfaces of the lenses and each groove has a surface 2a, 3<a>, parallel to the rays of light emerging from the corresponding lens. A cover glass E is supported by a cylindrical member F and a securing-ring 13 in front of the front lens C<2> and the central portion of the inner surface of the glass E is provided with horizontal prisms 12 to direct some of the light rays downwards. Concentric opaque cylindrical screens D are arranged between the cover glass E and the front lens C<2> in order to prevent light from entering the signal casing from outside, and the innermost screen preferably supports two flat ribs 9 disposed at right-angles to one another.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US275925XA | 1926-08-13 | 1926-08-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB275925A true GB275925A (en) | 1928-03-30 |
Family
ID=21838614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32975/26A Expired GB275925A (en) | 1926-08-13 | 1926-12-30 | Improvements in light signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB275925A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2145809A (en) * | 1983-08-29 | 1985-04-03 | Canadian Patents Dev | Lightning panel |
-
1926
- 1926-12-30 GB GB32975/26A patent/GB275925A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2145809A (en) * | 1983-08-29 | 1985-04-03 | Canadian Patents Dev | Lightning panel |
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