GB1240725A - Circuit for traffic lights - Google Patents
Circuit for traffic lightsInfo
- Publication number
- GB1240725A GB1240725A GB5410768A GB5410768A GB1240725A GB 1240725 A GB1240725 A GB 1240725A GB 5410768 A GB5410768 A GB 5410768A GB 5410768 A GB5410768 A GB 5410768A GB 1240725 A GB1240725 A GB 1240725A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supply
- relay
- lamps
- diodes
- lamp
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/097—Supervising of traffic control systems, e.g. by giving an alarm if two crossing streets have green light simultaneously
Abstract
1,240,725. Road traffic signals; lamp failure alarms. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 14 Nov., 1968 [15 Nov., 1967], No. 54107/68. Headings G4N and G4Q. [Also in Divisions H2 and H3] In a supervisory circuit for traffic light signalling for preventing two green signal lamps from operating simultaneously two green signal lamps V 1 , V 2 are connected across a supply via separate switching devices S 1 , S 2 , two diodes D 1 and D 2 are connected in series opposition between the lamps and a relay R is connected between the supply and the interconnection of the diodes. With both lamps V 1 , V 2 OFF current flows via the diodes D 1 , D 2 to the relay R which maintains the supply I, II connected. When switch S 1 or S 2 , which may be thyristors, are closed to light either lamp V 1 or V 2 one of the diodes D 1 or D 2 cuts OFF. However, current is maintained to the relay winding R, via the other diode D 2 or D 1 , so as to maintain the supply to the lamp which is on. If both switches were closed together the relay R is de-energized and disconnects the supply from the lamps and switches on yellow or orange flashing lights. If one of the green signal lamps or fuses connected in series with these lamps becomes defective then the relay R is also de-energized or an alarm will also be operative when the other green signal lamp is switched in. Also the circuit responds to an interruption of the supply to the relay. The supply I, II may be A.C. or D.C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR128238 | 1967-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1240725A true GB1240725A (en) | 1971-07-28 |
Family
ID=8641713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5410768A Expired GB1240725A (en) | 1967-11-15 | 1968-11-14 | Circuit for traffic lights |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE724064A (en) |
| CH (1) | CH477734A (en) |
| DE (1) | DE1808871B2 (en) |
| FR (1) | FR1551185A (en) |
| GB (1) | GB1240725A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL178634C (en) * | 1978-01-02 | 1986-04-16 | Philips Nv | DEVICE FOR DETECTING UNWANTED SIGNAL COMBINATIONS OF TWO SIGNAL LIGHTS IN TRAFFIC LIGHTS. |
| DE3120640A1 (en) * | 1981-05-23 | 1983-05-26 | Aeg Telefunken Nachrichten | Signalling and switching device |
-
1967
- 1967-11-15 FR FR1551185D patent/FR1551185A/fr not_active Expired
-
1968
- 1968-11-13 CH CH1695868A patent/CH477734A/en not_active IP Right Cessation
- 1968-11-14 DE DE19681808871 patent/DE1808871B2/en not_active Ceased
- 1968-11-14 GB GB5410768A patent/GB1240725A/en not_active Expired
- 1968-11-18 BE BE724064D patent/BE724064A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE724064A (en) | 1969-05-19 |
| DE1808871A1 (en) | 1969-06-26 |
| CH477734A (en) | 1969-08-31 |
| DE1808871B2 (en) | 1976-05-20 |
| FR1551185A (en) | 1968-12-27 |
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