GB811821A - Improvements in or relating to railway classification systems - Google Patents
Improvements in or relating to railway classification systemsInfo
- Publication number
- GB811821A GB811821A GB1387757A GB1387757A GB811821A GB 811821 A GB811821 A GB 811821A GB 1387757 A GB1387757 A GB 1387757A GB 1387757 A GB1387757 A GB 1387757A GB 811821 A GB811821 A GB 811821A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speed
- car
- circuit
- relay
- retarder
- 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
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K7/00—Railway stops fixed to permanent way; Track brakes or retarding apparatus fixed to permanent way; Sand tracks or the like
- B61K7/02—Track brakes or retarding apparatus
- B61K7/12—Track brakes or retarding apparatus electrically controlled
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
811,821. Railway classification systems. GENERAL RAILWAY SIGNAL CO. May 1, 1957, No. 13877/57. Class 103 (1). Control apparatus for a railway classification system comprises means, such as a radar type scanner, adapted to provide a beat-frequency output signal on the Doppler principle, the frequency being proportional to the speed of the car rolling over a track section, such section being provided with at least one car retarder, and retarder control means operable under the joint control of said speed measuring means and of release speed computing circuit means providing a continuously variable output proportional for each car to the desired release speed of such car from the retarder. The amplitude of beat frequency output signal is made proportional to the proximity of an approaching car and includes circuit means operable for a predetermined period in response to a predetermined amplitude of signal output from the speed measuring means. The circuit means includes an amplifier comprising tubes 47 and 52, Fig. 3A, which are interconnected to form what is commonly known as a Schmitt amplifier circuit. This applies output signals to operate a relay when the amplitude of such signals exceeds a predetermined level. A gate circuit comprising a triode 71 passes the output signals received from the speed-measuring means to a pulse-forming circuit including the one-shot multi-vibrator 81. This generates a pulse for each cycle of beat frequency oscillation received, and the positive going of these pulses are inverted by the amplifier 85 with the result that the input to diode 86 included in the speed relay control circuit 87 comprises negative-going pulses. The speed relay control circuit 87 thus receives negative-going voltage pulses from amplifiers 85, all the pulses being of the same amplitude and width, but their frequency varying with car speed. An anticipation relay control circuit operated in a similar manner to the speed relay control circuit but the control voltage applied to the cathode of diode 111, i.e. of a somewhat higher value than that to diode 86 so that the relay A1 drops at a slightly higher car speed than the relay S1, causing the retarder to be partially released. The exit relay control circuit, i.e. operated as a function of the proximity of the car to the transmitting antenna, and is independent of actual car speed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1387757A GB811821A (en) | 1957-05-01 | 1957-05-01 | Improvements in or relating to railway classification systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1387757A GB811821A (en) | 1957-05-01 | 1957-05-01 | Improvements in or relating to railway classification systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB811821A true GB811821A (en) | 1959-04-15 |
Family
ID=10030998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1387757A Expired GB811821A (en) | 1957-05-01 | 1957-05-01 | Improvements in or relating to railway classification systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB811821A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3054892A (en) * | 1957-11-08 | 1962-09-18 | Westinghouse Air Brake Co | Computing apparatus |
US3227871A (en) * | 1960-09-14 | 1966-01-04 | Westinghouse Air Brake Co | Computing apparatus |
GB2126392A (en) * | 1982-08-18 | 1984-03-21 | Dowty Hydraulic Units Ltd | Railway marshalling yards |
-
1957
- 1957-05-01 GB GB1387757A patent/GB811821A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3054892A (en) * | 1957-11-08 | 1962-09-18 | Westinghouse Air Brake Co | Computing apparatus |
US3227871A (en) * | 1960-09-14 | 1966-01-04 | Westinghouse Air Brake Co | Computing apparatus |
GB2126392A (en) * | 1982-08-18 | 1984-03-21 | Dowty Hydraulic Units Ltd | Railway marshalling yards |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1237134A (en) | Ranging device | |
GB1370165A (en) | Process and apparatus for controlling vehicles moving in succ ession along a track | |
GB1289912A (en) | ||
GB1387579A (en) | Doppler radar systems | |
GB811821A (en) | Improvements in or relating to railway classification systems | |
GB968207A (en) | Signal measuring circuit | |
US2563902A (en) | Multiple pulse gating | |
GB1285175A (en) | Improvements in or relating to apparatus for measuring the flow velocity of fluids | |
US2560289A (en) | Pulsed distance measuring instrument | |
GB753069A (en) | Improvements in or relating to speed measuring devices employed in railroad car retarder control systems | |
GB1243594A (en) | Improvements in or relating to automatic frequency controlled oscillators | |
GB1039323A (en) | Improvements in or relating to radar systems | |
US3611383A (en) | Instantaneous predictive automatic gain control circuit useful in loran navigation | |
GB1043721A (en) | Improvements in or relating to distance measuring equipment | |
GB1448719A (en) | Maintaining the distance between two vehicles moving along a fixed path | |
US3323053A (en) | Digital output phase meter | |
GB1187775A (en) | Improvements in or relating to Ultra-Sonic Presence Detectors | |
GB1102855A (en) | Fast recovery read amplifier | |
GB1038104A (en) | Improvements in or relating to pulsed radar equipments | |
GB1296292A (en) | ||
GB792229A (en) | Improvements in or relating to automatic frequency control systems for radio navigation systems | |
GB1413082A (en) | Trafficlight control systems | |
US2728907A (en) | Servo systems for pulse signals | |
GB943819A (en) | A wide dynamic range amplifier and detector system | |
GB1152516A (en) | Improvements in or relating to Distance Measuring Apparatus |