GB1437194A - Track circuits - Google Patents
Track circuitsInfo
- Publication number
- GB1437194A GB1437194A GB4362573A GB4362573A GB1437194A GB 1437194 A GB1437194 A GB 1437194A GB 4362573 A GB4362573 A GB 4362573A GB 4362573 A GB4362573 A GB 4362573A GB 1437194 A GB1437194 A GB 1437194A
- Authority
- GB
- United Kingdom
- Prior art keywords
- track
- supplied
- code
- signal
- phase
- 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
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/18—Railway track circuits
- B61L1/181—Details
- B61L1/187—Use of alternating current
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
1437194 Continuous rail track circuit WESTINGHOUSE AIR BRAKE CO 18 Sept 1973 [18 Sept 1972] 43625/73 Heading B7H In a continuous rail track circuit system, each junction between circuits, e.g. LT, RT includes a cross bond 3, a transmitter coil 4 coupled to the hand for supplying to the track a signal from a local source at mains frequency, or twice that frequency, via a contact a of a code repeater relay CTP, the signal being of the same frequency but different in phase to that supplied at adjacent junctions, a pair of receive loops LL, RL, one on each side of the junction, each connected to a phase sensitive unit P.S.U. which is also supplied from the local source with a signal in anti-phase to that supplied to the track so as to respond only to signals received via the track from the adjacent junctions, a code follower track relay LTR or RTR associated with each unit PSU and a timing logic arrangement 6 which controls sequential switching of the apparatus between transmit and receive modes. Unit 5 decodes the operation of the track relays to provide track occupancy information and determines the code rate for the code repeater relay CTP.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28997172A | 1972-09-18 | 1972-09-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1437194A true GB1437194A (en) | 1976-05-26 |
Family
ID=23113979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4362573A Expired GB1437194A (en) | 1972-09-18 | 1973-09-18 | Track circuits |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3781540A (en) |
| AU (1) | AU472381B2 (en) |
| CA (1) | CA954969A (en) |
| GB (1) | GB1437194A (en) |
| IT (1) | IT996703B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3986691A (en) * | 1975-05-30 | 1976-10-19 | Westinghouse Air Brake Company | Phase selective track circuit apparatus |
| US5219426A (en) * | 1992-02-25 | 1993-06-15 | Union Switch & Signal Inc. | Single-element coded alternating current railway track circuit having double-element, phase-selective capability |
-
1972
- 1972-09-18 US US00289971A patent/US3781540A/en not_active Expired - Lifetime
-
1973
- 1973-08-30 CA CA179,999A patent/CA954969A/en not_active Expired
- 1973-08-30 AU AU59803/73A patent/AU472381B2/en not_active Expired
- 1973-09-17 IT IT69746/73A patent/IT996703B/en active
- 1973-09-18 GB GB4362573A patent/GB1437194A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3781540A (en) | 1973-12-25 |
| IT996703B (en) | 1975-12-10 |
| AU5980373A (en) | 1975-03-06 |
| CA954969A (en) | 1974-09-17 |
| AU472381B2 (en) | 1976-05-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |