GB360471A - Improvements in traffic control systems - Google Patents
Improvements in traffic control systemsInfo
- Publication number
- GB360471A GB360471A GB23542/30A GB2354230A GB360471A GB 360471 A GB360471 A GB 360471A GB 23542/30 A GB23542/30 A GB 23542/30A GB 2354230 A GB2354230 A GB 2354230A GB 360471 A GB360471 A GB 360471A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cams
- condenser
- switches
- switch
- closed
- 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
- G08G1/07—Controlling traffic signals
- G08G1/085—Controlling traffic signals using a free-running cyclic timer
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Traffic Control Systems (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
360,471. Road signals for controlling traffic. JENNINGS, H. W. K., 51, Chancery Lane, London.-(Automatic Signal Corporation ; 205, Church Street, New Haven, Connecticut, U.S.A.) Aug. 6, 1930, No. 23542. [Class 118 (ii).] The closing of a pedestrian-operated control switch P, Fig. 7, energizes a relay 87 controlling a timing circuit which is opened and closed for predetermined periods to light signals in a desired sequence. The lighting of the signals is controlled by switches 56 .. 65 operated by cams 42, Fig. 6, mounted on a shaft 23 which is rotated by ratchet wheel 25, Fig. 4, rotated by a pawl 35 attached to a core 32 in an electromagnet 29. The timing circuit comprises a glow tube 84, a condenser 83, a relay 94, and one of the adjustable resistances 80, 103, 101, 102, which are switched in as the cams rotate, the arrangement being such that when the voltage across the condenser is built up to the critical voltage of the tube, a current flows momentarily from the condenser through the tube and relay 94, which then closes a circuit through the electromagnet 29 actuating the cams. The condenser 83 is discharged at the end of each movement of the cams, through a shunt resistance 100 by the closing of a switch 76 actuated by the arm 26 carrying the pawl 35. The switches 56 .. 65 each have contacts 52, 53, Fig. 6, carried on flexible strips 46, 47, the inner strips having projections 51 engaging the cams, each of which operate two pairs of contacts. The cams are so shaped that the switches are closed three times during each revolution of the cams. The lines A .. D, Fig. 5a, indicate when the ten switches 56 .. 65 are open and closed during the rotation of the five cams through one-third of a revolution. The dots and thick lines indicate that 'the switches are closed. In the normal position of the cams corresponding to the line D, the switches 56, 57 are closed, thus lighting yellow signals on, say, main and cross streets. When a pedestrian closes the switch P, a circuit is completed through the relay 87, which closes contacts 92, 93, completing the discharge circuit for the condenser 83 through the tube 84, with consequent rotation of the cams by the pawl 35 to a position corresponding to the line A. In this position, the switches 58, 59 are closed, thus lighting the red signals, and the switch 65 of the resistance 80 is opened and the switch 62 of the resistance 101 is closed. The resistance 101 is so adjusted that the time necessary for the condenser 83 to reach the critical voltage of the glow tube is, say, five seconds. The tube then flashes and the cams are moved forward another notch to the position corresponding to the line B. In this position, the lighting switches 56, 57 are open, and the lighting switches 58, 59 remain closed, while by the closing of switch 63 the condenser 83 is now charged through a resistance 102 adjusted to give, say, ten seconds before the condenser is discharged through the glow tube. The cams are then moved forward to the position corresponding to the line C, causing the yellow light on the cross street to reappear and switching a resistance 103 into the condenser circuit. This resistance may be set to allow five seconds before the condenser is discharged. The cams then move to the position corresponding to the line D, and the operations are twice repeated during the rotation of the cams through the other two-thirds of their revolution. The cams may be actuated by a number of pedestrian-operated switches connected in parallel. The relay 87 is maintained energized after operation of a switch P by a locking switch 90. The circuit through this switch is interrupted by a cam-operated switch 60 in the position of the cams corresponding to the line B.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US468377A US1954992A (en) | 1930-07-16 | 1930-07-16 | Traffic control system |
GB23542/30A GB360471A (en) | 1930-07-16 | 1930-08-06 | Improvements in traffic control systems |
FR701147D FR701147A (en) | 1930-07-16 | 1930-08-09 | Vehicle traffic control device |
DE1930652893D DE652893C (en) | 1930-07-16 | 1930-08-16 | Traffic control system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US468377A US1954992A (en) | 1930-07-16 | 1930-07-16 | Traffic control system |
GB23542/30A GB360471A (en) | 1930-07-16 | 1930-08-06 | Improvements in traffic control systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB360471A true GB360471A (en) | 1931-11-06 |
Family
ID=26256578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB23542/30A Expired GB360471A (en) | 1930-07-16 | 1930-08-06 | Improvements in traffic control systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US1954992A (en) |
DE (1) | DE652893C (en) |
FR (1) | FR701147A (en) |
GB (1) | GB360471A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE767104C (en) * | 1939-08-09 | 1953-01-05 | Allg Elektro Ind Heinrich Wink | Light signal system, especially for brake test reporting systems in railway companies |
DE1034522B (en) * | 1955-03-08 | 1958-07-17 | Erich Meier Dipl Ing | Warning system for public traffic routes, especially highways |
US3196388A (en) * | 1959-04-10 | 1965-07-20 | Bliss E W Co | Auxiliary traffic controllers |
-
1930
- 1930-07-16 US US468377A patent/US1954992A/en not_active Expired - Lifetime
- 1930-08-06 GB GB23542/30A patent/GB360471A/en not_active Expired
- 1930-08-09 FR FR701147D patent/FR701147A/en not_active Expired
- 1930-08-16 DE DE1930652893D patent/DE652893C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1954992A (en) | 1934-04-17 |
FR701147A (en) | 1931-03-12 |
DE652893C (en) | 1937-11-11 |
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