GB788453A - Improvements relating to the detection of railway vehicle wheels passing a fixed location - Google Patents
Improvements relating to the detection of railway vehicle wheels passing a fixed locationInfo
- Publication number
- GB788453A GB788453A GB695555A GB695555A GB788453A GB 788453 A GB788453 A GB 788453A GB 695555 A GB695555 A GB 695555A GB 695555 A GB695555 A GB 695555A GB 788453 A GB788453 A GB 788453A
- Authority
- GB
- United Kingdom
- Prior art keywords
- track
- capacitor
- exciting coil
- section
- series
- 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
- 238000001514 detection method Methods 0.000 title 1
- 239000003990 capacitor Substances 0.000 abstract 4
- 230000004907 flux Effects 0.000 abstract 1
- 230000001939 inductive effect Effects 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/16—Devices for counting axles; Devices for counting vehicles
- B61L1/163—Detection devices
- B61L1/165—Electrical
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
788,453. Railway signals. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Feb. 21, 1956 [March 9, 1955], No. 6955/55. Class 105. The passage of a vehicle wheel past a fixed location as in the counting of the number of axles into and out of a railway track section to give an indication when a train has left a section, is detected by a single magnetic structure 4 disposed at one side only of the track rail and having an open magnetic circuit constituting part of an inductive device L having an exciting coil 3 connected in series with an impedance element for energization from an A.C. supply, e.g. 50 p.p.s., the said device L being disposed close to a running rail 1 so that a passing wheel 2 will cut a leakage flux path of the magnetic circuit to produce a temporary change in the effective impedance of the exciting coil, this change being detected for example by the unbalance of a normally balanced impedance bridge in which the series combination is incorporated. As shown, the bridge impedance in series with the exciting coil 3 is preferably a capacitor C and the other two series arms also consist of an inductance L<SP>1</SP> situated out of the influence of the passing wheels and a capacitor C<SP>1</SP>. The capacitor C is such that in the normal conditions, in the absence of a wheel, the inductance of the exciting coil 3 of the capacitor C just does not resonate at the supply frequency but passes through resonance as a wheel passes by. The magnitude of the change, amplified if necessary, actuates a counting device CR of known form. Two such counting devices are operated respectively at the entrance and exit ends of the section of track and the counted outputs compared to indicate whether or not the section has been vacated. To determine the direction of movement of the train, two similar detecting arrangements will be provided with their respective devices L placed along the track a suitable distance apart either on the same or opposite sides of the track and a device provided to indicate which bridge becomes unbalanced first.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB695555A GB788453A (en) | 1955-03-09 | 1955-03-09 | Improvements relating to the detection of railway vehicle wheels passing a fixed location |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB695555A GB788453A (en) | 1955-03-09 | 1955-03-09 | Improvements relating to the detection of railway vehicle wheels passing a fixed location |
Publications (1)
Publication Number | Publication Date |
---|---|
GB788453A true GB788453A (en) | 1958-01-02 |
Family
ID=9823894
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB695555A Expired GB788453A (en) | 1955-03-09 | 1955-03-09 | Improvements relating to the detection of railway vehicle wheels passing a fixed location |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB788453A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3144227A (en) * | 1959-08-14 | 1964-08-11 | Int Standard Electric Corp | Electromagnetic track apparatus, particularly for axle-counting systems in railway safety installations |
US3210539A (en) * | 1959-03-06 | 1965-10-05 | Silec Liaisons Elec | System responsive to the displacement of metallic objects |
US3294969A (en) * | 1964-08-14 | 1966-12-27 | Gen Signal Corp | Hot wheel detector apparatus for railway vehicles |
EP2899093A1 (en) * | 2014-01-27 | 2015-07-29 | Thales Deutschland GmbH | Redundancy Switching of Detection Points |
-
1955
- 1955-03-09 GB GB695555A patent/GB788453A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3210539A (en) * | 1959-03-06 | 1965-10-05 | Silec Liaisons Elec | System responsive to the displacement of metallic objects |
US3144227A (en) * | 1959-08-14 | 1964-08-11 | Int Standard Electric Corp | Electromagnetic track apparatus, particularly for axle-counting systems in railway safety installations |
US3294969A (en) * | 1964-08-14 | 1966-12-27 | Gen Signal Corp | Hot wheel detector apparatus for railway vehicles |
EP2899093A1 (en) * | 2014-01-27 | 2015-07-29 | Thales Deutschland GmbH | Redundancy Switching of Detection Points |
WO2015110371A1 (en) * | 2014-01-27 | 2015-07-30 | Thales Deutschland Gmbh | Redundancy switching of detection points |
US10144439B2 (en) | 2014-01-27 | 2018-12-04 | Thales Deutschland Gmbh | Redundancy switching of detection points |
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