GB489861A - Improvements relating to light signals for railways and the like - Google Patents
Improvements relating to light signals for railways and the likeInfo
- Publication number
- GB489861A GB489861A GB334937A GB334937A GB489861A GB 489861 A GB489861 A GB 489861A GB 334937 A GB334937 A GB 334937A GB 334937 A GB334937 A GB 334937A GB 489861 A GB489861 A GB 489861A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- relay
- luminous
- resistances
- energized
- 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
- B61L5/1881—Wiring diagrams for power supply, control or testing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
489,861. Railway light signals; lamp - failure alarms. MACGREGOR, R. M., and WESTINGHOUSE BRAKE & SIGNAL CO., Ltd. Feb. 4, 1937, No. 3349. [Class 105] [Also in Group XXXVIII] A light signal for railways has a relatively low current flowing through the lamp when it is non- luminous and a lamp-failure relay is so associated with the circuit as to be energized by a current substantially the same whether the lamp is luminous or non-luminous so long as the circuit is intact. The Figure shows an arrangement in which an approaching train renders the signal lamp 1 luminous by closing a contact 8 to shunt out resistances 2, 3 in the circuit to the lamp. At other times these resistances together with a resistance 4 reduce the current below the luminous value and the voltage drop across the resistances 3, 4 is used to energize a relay 14. When the lamp is luminous an increased voltage drop exists across the resistance 4 but the current in the relay 14 remains substantially the same as before since this increased voltage drop is now applied to the relay 14 through the resistances 2, 3 in parallel and so is only partially effective. On failure of the lamp 1 the relay 14 is de-energized and so gives an indication ; in addition the de-energized relay 14 switches in a substitute filament or lamp 16 which may be approach lit by a contact 18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB334937A GB489861A (en) | 1937-02-04 | 1937-02-04 | Improvements relating to light signals for railways and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB334937A GB489861A (en) | 1937-02-04 | 1937-02-04 | Improvements relating to light signals for railways and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB489861A true GB489861A (en) | 1938-08-04 |
Family
ID=9756635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB334937A Expired GB489861A (en) | 1937-02-04 | 1937-02-04 | Improvements relating to light signals for railways and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB489861A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129235A (en) * | 1982-09-28 | 1984-05-10 | Electronic Components Ltd | Lamp monitoring circuit |
| US5490759A (en) * | 1994-04-28 | 1996-02-13 | Hoffman; Jay | Magnetic damping system to limit blade tip vibrations in turbomachines |
-
1937
- 1937-02-04 GB GB334937A patent/GB489861A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129235A (en) * | 1982-09-28 | 1984-05-10 | Electronic Components Ltd | Lamp monitoring circuit |
| US5490759A (en) * | 1994-04-28 | 1996-02-13 | Hoffman; Jay | Magnetic damping system to limit blade tip vibrations in turbomachines |
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