GB1341465A - Ac track circuit apparatus for continuous rail track - Google Patents
Ac track circuit apparatus for continuous rail trackInfo
- Publication number
- GB1341465A GB1341465A GB1309971*[A GB1309971A GB1341465A GB 1341465 A GB1341465 A GB 1341465A GB 1309971 A GB1309971 A GB 1309971A GB 1341465 A GB1341465 A GB 1341465A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- track
- receiver
- transmitter
- output
- 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
- 230000000737 periodic effect Effects 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000011664 signaling 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
- B61L1/18—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
1341465 AC track circuit GENERAL SIGNAL CORP 4 May 1971 [4 May 1970] 13099/71 Heading B7N In a continuous rail alternating current track circuit with ends defined by track shunts ST, a transmitter and receiver are provided at each end of the circuit for detecting the presence of a vehicle in an end zone of the circuit and at least one other receiver is provided at an end zone responsive to the transmitter in the other end zone for detecting the presence of a vehicle in the mid zone of the circuit. A periodically operating test shunt is provided at each end zone circuit. The shunt 14 is periodically applied by a signal from pulse generator 13 whereby at each application the increase in output current from transmitter T 1 is detected by receiver R 1 which supplies an output to shift the frequency of oscillator 10 supplying the transmitter output. This periodic shift is detected by receiver R 1 <SP>1</SP> at the other end of the circuit and this provides an output to control the application of shunt 20 across the other end of the track circuit. The corresponding increase in output current from transmitter T 2 is detected by receiver R 2 which supplies an output to shift the frequency of oscillator 26 feeding transmitter T 2 . The frequency shifted signals received in receiver R 2 <SP>1</SP> at the first and of the circuit control a flip-flop 30. If the flip-flop output signals correspond with those supplied from the switching pulse generator 13 a gate 50 operating via flip-flop 57 and driver circuit 58 maintains the track circuit relay 41 energized. A train present in either end zone prevents the periodic shift in frequency and a train present in the mid zone prevents transmission of the signals between the circuit ends, either condition leads to release of the track relay. Between the switching pulses the track circuit signal can be coded for cab signalling purposes. A frequency shift repeater station can be provided to extend the length of the circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3423770A | 1970-05-04 | 1970-05-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1341465A true GB1341465A (en) | 1973-12-19 |
Family
ID=21875143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1309971*[A Expired GB1341465A (en) | 1970-05-04 | 1971-05-04 | Ac track circuit apparatus for continuous rail track |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3663809A (en) |
| CA (1) | CA933641A (en) |
| DE (1) | DE2121971A1 (en) |
| FR (1) | FR2091201A5 (en) |
| GB (1) | GB1341465A (en) |
| NL (1) | NL7106098A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3951364A (en) * | 1975-01-09 | 1976-04-20 | General Signal Corporation | Track circuit |
| CS217737B1 (en) * | 1980-04-04 | 1983-01-28 | Oldrich Poupe | Connection of the railway circuit with plural signalling sources |
| FR2486006A1 (en) * | 1980-07-07 | 1982-01-08 | Jeumont Schneider | LOOP INDUCING A CURRENT IN THE TWO RAILS OF A RAILWAY |
| FR2490569A1 (en) * | 1980-09-22 | 1982-03-26 | Signaux Entr Electriques | PERFECTION RAILWAY TRACK CIRCUIT |
| DE3534708A1 (en) * | 1985-09-28 | 1987-04-02 | Ivv Ingenieurgesellschaft Fuer | TRACK CIRCUIT WITH OR WITHOUT INSULATION FOR RAILWAY SYSTEMS |
| GB2418051A (en) * | 2004-09-09 | 2006-03-15 | Westinghouse Brake & Signal | Backup system for detecting a vehicle which may not cause a track circuit to operate. |
| MX2022004535A (en) | 2019-10-14 | 2022-09-19 | Athena Industrial Tech Inc | Broken rail detector. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1036142A (en) * | 1950-04-27 | 1953-09-03 | Materiel Telephonique | Track circuit for rail transport safety system |
-
1970
- 1970-05-04 US US34237A patent/US3663809A/en not_active Expired - Lifetime
-
1971
- 1971-04-01 CA CA109376A patent/CA933641A/en not_active Expired
- 1971-05-04 DE DE19712121971 patent/DE2121971A1/en active Pending
- 1971-05-04 NL NL7106098A patent/NL7106098A/xx unknown
- 1971-05-04 GB GB1309971*[A patent/GB1341465A/en not_active Expired
- 1971-05-04 FR FR7116088A patent/FR2091201A5/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2121971A1 (en) | 1971-11-25 |
| US3663809A (en) | 1972-05-16 |
| NL7106098A (en) | 1971-11-08 |
| FR2091201A5 (en) | 1972-01-14 |
| CA933641A (en) | 1973-09-11 |
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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 |