GB215535A - Improvements relating to electric signalling apparatus for railways and the like - Google Patents
Improvements relating to electric signalling apparatus for railways and the likeInfo
- Publication number
- GB215535A GB215535A GB986923A GB986923A GB215535A GB 215535 A GB215535 A GB 215535A GB 986923 A GB986923 A GB 986923A GB 986923 A GB986923 A GB 986923A GB 215535 A GB215535 A GB 215535A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- signal
- impedance
- resistance
- lead
- 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
215,535. Peter, L. H., Dell, R., and Westinghouse Brake & Saxby Signal Co., Ltd. April 11, 1923. Lamp signals.-In order that failure of a signal lamp may be shown by a lamp or other indicator, but failure of the indicator lamp or circuit shall not disable the signal lamp, the signal is in series with an impedance, the indicator circuit being in shunt between two points of the impedance. Current normally passes from lead 12, Fig. 1, through a danger indication lamp 16, smaller portion of a resistance 18, duplicated danger signal lamp 2, back contact 9 of a relay 7, and return lead 13. The lamp 16 is bridged by the greater portion of resistance 18 which is connected with lead 12 through a conductor 30. A caution signal is given by closure of a switch 15 operated bv a signal lever. Current first passes from lead 12 through conductor 30, relay winding 7, resistance 14, switch 15 to lead 13. Relay 7 breaks the circuit through lamp 2 at contact 9, and also closes contact 6, completing a circuit through duplicated caution signal lamp 3 across the winding of relay 7. The caution indicating lamp 17 is connected in shunt between adjustable points of resistance 14. Owing to the high resistance of the relay winding 7, the indication lamp 17 does not glow unless the shunt circuit through lamp 3 is closed. Fig. 2 shows the invention applied to a system of the kind described in Specification 27275/11. An indication lamp 16 is shown only in conjunction with the danger signal 2, but the arrangement may also be applied to the cautionary signal 3. The primary 19 of a transformer 20 is supplied from leads 12, 13. The signal lamp 2 in series with an impedance 24 and resistance 25 is connected across a portion of the secondary winding 21 by conductors 22, 23. The lamp 16 is in shunt across impedance 24 through conductors 22, 26. Impedance 24 and lamp 2 are also bridged by the secondary of a transformer 28, the primary of which, in series with signal lamp 3 and switch 15, is connected across the secondary 21 of transformer 20. On closure of switch 15 transformer 28 functions to divert current from lamp 2 and impedance 24 through lamp 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB986923A GB215535A (en) | 1923-04-11 | 1923-04-11 | Improvements relating to electric signalling apparatus for railways and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB986923A GB215535A (en) | 1923-04-11 | 1923-04-11 | Improvements relating to electric signalling apparatus for railways and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB215535A true GB215535A (en) | 1924-05-15 |
Family
ID=9880268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB986923A Expired GB215535A (en) | 1923-04-11 | 1923-04-11 | Improvements relating to electric signalling apparatus for railways and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB215535A (en) |
-
1923
- 1923-04-11 GB GB986923A patent/GB215535A/en not_active Expired
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