Patent GB-415787-A (GB)
Title: Improvements relating to remote control systems
IPC: B61L7/08
Filed: 1933-03-03
Abstract: 415,787. Electric signalling and remote control systems. WESTING- HOUSE BRAKE & SAXBY SIGNAL CO., Ltd., 82, York Road, King's Cross, London.- (Assignees of Lewis, L. V. ; Edgewood Borough, Pennsylvania, U.S.A.) March 3, 1933, No. 6494. Convention date, March 23, 1932. [Class 40 (i).] In a remote-control and supervisory signalling system, signals and controls are transmitted over two line wires by means of impulses of varying lengths, the lengths of both the make and break portions of the impulses being variable to enable both portions to be used for selective purposes. As described, one of a number of stations along the line is selected, or, in the case of a supervisory signal the sending station is identified, by the position of three long portions in a train of four impulses comprising four make and four break periods, and the control or supervisory indication is determined by the position of long periods in a succeeding train of impulses. For a control signal the second impulse train comprises 3 impulses (3 makes and 3 breaks) and for the supervisory signal the second train comprises 4 impulses. All signals are transmitted and received over relay chains and all impulses are generated and the time period of each portion of each impulse is determined by relays. The system is described as applied to the control of signals and points in a railway installation and to the signalling back of signal, point and train positions. The movement of trains over the section is recorded. General layout. The general layout of the system is indicated in Fig. 10 in which O represents the control station and 1S, 2S two sub-stations, further sub-stations similar to 1S being inserted where the lines Z, Y1 are shown dotted. When a control code is being transmitted, relay OT is energized intermittently and relay OR at the control station and relays R at the sub-stations repeat the impulse periods to relay apparatus. When sub-station 1S is transmitting relay M is energized to replace the remote portion of the line by resistance IR5 and relay T transmits the signal trains. Whilst station 1S is transmitting the normally energized relays R at more remote stations are released to prevent these stations from transmitting. Switches 1M, 2M are provided to enable a sub-station unit to be removed from the circuit when necessary and switch 1N allows a remote portion of the line circuit to be disconnected. Transmission of station selecting impulses. The station control panel for the section shown in Fig. 9 is indicated to the right of Fig. 5 and this controls, and is controlled by, the main station relay equipment shown in Figs. 1-5. The sub-station apparatus is indicated in Figs. 6-9. The apparatus shown is reached by code 234 and to initiate the operation, the relative starting key SK (Fig. 5) is operated energizing relay 234 which looks and at its contact 234c (Fig. 2) completes a circuit for relay OM (Fig. 1). Relay OT pulls up and opens the line circuit releasing relay OR (Fig. 1) and the R relays at all sub-stations. The operation at the sub-stations is described hereafter, but at the main station relays OL1, OL2, O1 OLP, OLBP and OE pull up. Relay OL1 opens the initial energizing circuit of OM, but this relay is slow to release due to the circuit through rectifier 07r and maintains its armature until a locking circuit is completed by relay OLB. Relay OM remains energized throughout the call. Relay OE is energized when O1 pulls up, relay MEP is operated and lamp 4OE lights. Relay MEP changes over its contacts a-e to prepare circuits for maintaining OT. Relay OLBP opens the circuit for OL1 which releases followed by OLP and this latter relay releases OT to terminate the first break in the line. Relay OR now pulls up and OL1 re-energizes, O2 pulls up and O1 falls away. Relay O1 completes a circuit over contacts c of relays 03, 05 and 07 to the right hand terminal of OT, but this relay does not energize as its left hand terminal is connected to similar potential over contact c of 02, 106 and c of 234. The first make (second portion of code transmission) is therefore prolonged and OL2 falls away followed by OLP. A circuit is thus completed for the first selector relay 2F over 135, d of 02, e of OL2 and g of OM. Relay OFP pulls up and OE releases, breaking the circuit of MEP and allowing OT to pull up and start the third code portion (the second break). Relay OR releases, 03 energizes and 02 falls away. Relay 03 opens the initial energizing circuit of OT, but completes a holding circuit over 129, j of 2F and c of 234 to prolong the third code signal. Relays OL1 and OLP release slowly in turn and, when both relays are back, a circuit is completed over contact d of 03 and 143 for 23G. Relay OGP pulls up and locks in parallel with 23G, opening the circuits of OFP and 2F which release. Relav OT releases to terminate the third code portion and commence the fourth section (the second make). As this fourth section is also prolonged, a hold down circuit for OT is completed over c of 04, 130, j of 23G and c of 234 so that OL2 and OLP release, relay 234S is energized over 144, and locks in parallel with OSP which releases OGP and 23G. Relay 234 releases and opens its c contact to terminate the fourth code element. The remaining elements of the station selecting code are transmitted as short impulses and energize in turn relays O5-O8. When 234S operated, it opened its back contact e (Fig. 5) to release any of the indication relays 10K-15K that were operated and all the lever panel lights are extinguished. Transmission of control code. The code portions 9-13 are the control impulses. If switch WR is in the position shown in Fig. 5, the ninth impulse is prolonged ; in its reverse position the eleventh impulse ; if switch HK makes its contact l the tenth is a long impulse, whilst the twelfth is prolonged if HK makes r. The thirteenth impulse is long if UK is closed. For the positions indicated in Fig. 5 only the ninth is a long impulse. When relay OSP operated it prepared a circuit over its contact f for O1 to pull up on the ninth impulse period, and when O1 is up, OT is held energized over 124 and n of WK (Fig. 5) until OL1 and OLP have both fallen away. Should other of the control levers be operated, the relative code portions are prolonged in a similar manner to that described above, the circuits being obvious from the drawings. When the thirteenth code element has terminated, relay OR remains steadily energized; relays OL2, OLP, OLB, OLBP, 234S and OSP release and 06 and OL1 fall away. Relay OM de-energized when OLB released to extinguish lamp 4OE and the transmitting apparatus is then normal. Reception of station selecting and control codes. Relay R at the sub-station operates in synchronism with OR at the control point. When R first falls away L1, L2, LP, LB, LBP and 1 pull up and as the first code pulse is prolonged, it always is on a control code, L1 releases enabling E to pull up and lock to contact a of LBP for the code transmission During the second code element 02 is operated and as this element is long, L2 falls away and F is energized over 2d and 60. The third code pulse being prolonged L falls away and G is energized, releasing F, and during the fourth element L2 is de-energized and relay S (Fig. 7) pulls up. SP is energized and F falls away opening the circuits to all other S relays. At the selected station relay 1 is again energized on the ninth pulse and CR pulls up to enable relays 9-13 to be operated on long impulses. In the transmission under consideration the ninth element is prolonged so that L1 falls away during the pulse and relay 9 is energized. As the remaining elements are short relays 10-13 are not operated. When R becomes steadily energized at the termination of the thirteenth element, relay D of the selected unit is operated over lead 29 and connects contacts of relays 9-13 to the switch and signal relays Fig. 8. As only relay 9 is energized relay NWS is energized and closes a holding circuit for itself. Relay 13V is also energized when D pulls up to initiate the transmission of an indication code when the receiving operations are completed. Transmission of supervisory signal train. When relay D releases relay ST is energized and locks, completing a circuit from contact c of ST over 38 to relay M. Relay M disconnects the more remote stations from the signalling circuit, as described with reference to Fig. 10, and sets relay T in operation to control relays R and OR at the transmitting sub-station and the main station respectively. When R first releases relays L1, L, L2, LB and LBP operate and M is locked up for the duration of the call When LBP picks up, T releases to terminate the first code element which is a short element to ensure that relays E at the transmitting sub-station and at sub-stations between it and the main station are not energized. The element is, however, longer than a normal short element to allow the necessary relays energized during the first code signal to pick up. As the code of the sending sub-station is 234, the second, third and fourth elements of the transmitted codes are prolonged, the holding circuits extending over 2c, 51 and Fb ; 3c, 59 and Fb operated ; and 4c, 49, STb and Gb respectively; F, G, and S being energized during the second, third and fourth elements respectively as described above for the reception of a control code. The pulses five to eight are short. When S energizes, MSP pulls up to connect wires 89 to 95 to the f contacts of relays 1-7, to provide holding circuits for T, over 24 and 25, to prolong the indication code elements in accordance with the condition of the apparatus at the sub-station. For the condition of apparatus indicated in Fig. 8, as RAR is energized, lead 89 is disconnected and the ninth element is short ; as the signals are all at stop lead 90 is live and the tenth element is prolonged, but the twelfth and fourteenth elements are short ; the eleventh a