Patent GB-399539-A (GB)
Title: Improvements relating to electric selective remote control systems
IPC: B61L7/08
Filed: 1932-04-04
Abstract: 399,539. Electric signalling and control systems. WESTINGHOUSE BRAKE & SAXBY SIGNAL CO., Ltd., 82, York Road, King's Cross, London.-(Assignees of Snavely, C. S. ; 420, W. Swissvale Avenue, Miller, A. B. ; 259, Maple Avenue, both in Edgewood, Pittsburg, and Tunell, R. H. ; 521, Hill Avenue, Wilkinsburg, both in Pennsylvania, U.S.A.) April 4, 1932, No. 9684. Convention date, May 18, 1931. [Class 40 (i).] In an electric selective remote control system, more particularly for controlling railway points and signals, a plurality of outlying stations is connected to a control and supervising office over common line wires and control and signalling is effected between any one station and the control office by code signals, each signal consisting of a number of makes or breaks in one or more of the line circuits connecting the stations. The transmitted code signals operate a chain of relays at the receiving station, the relays being adapted to control devices which are selectively responsive to various elements of each signal. Figs. 1 to 5 show the equipment provided at the dispatcher's office and Figs. 7 to 11 show the apparatus at one outlying station adapted for the operation of railway points 103 and signals IRA, IRB, IRC, ILA, ILB, Fig. 11. The points and signals at each station are provided with control levers, e.g. PL, SL, CSB, at the dispatcher's office and according to the opera-. tion of the levers characteristic codes are transmitted to effect the appropriate operations. The stations are interconnected by line wires XL, YL, ZL, the latter forming a common return for the lines XL, YL one or other or both of which may be selectively ' opened a number of times to form a code signal. Each outlying station has a chain of. relays T, R and the dispatcher's office has a chain OT, OR the relays at. signalling stations being operated in synchronism so as to distribute the elements of a code signal to effect a desired selection. Fig. 4 shows a coding group of relays at the dispatcher's office which are under the control of the switch and signal levers and are adapted to determine the codes to be transmitted. Similar coding relays are provided at each outlying station to effect the transmission of an " indication " code to the control office. The receiving circuits at outlying stations are arranged to be responsive to different control codes in order that station selection may be accomplished. Each control signal is made up of eight elements, the 1st acting as a line check, the 2nd, 3rd and 4th being appropriated to station selection and the last four being utilized for the control of the various devices at the selected station. The " indication" codes are'similarly arranged to select and operate signalling apparatus appropriate to the signalling station. Control of devices at an outlying station. The levers, e.g. the signal lever SL, " call on " signal button CSB, &c., Fig. 4, corresponding to the devices it is desired to operate, are operated and a start button SB which initiates the operation of the control equipment is depressed. A relay in the group OSA is operated upon depression of key SB and a relay OTZ, Fig. 1, 'is energized to open both line wires XL, YL and thereby produce the first element of the code. The line wires include line relays ORX, ORY at the control station and line relays RX, RY at each outlying station so that upon opening both line circuits all the line relays are de-energized. Release of the line relays pulls up OLO at the control station and LO at the substations to cause operation of the first relays OT1, T1 in the counting chains at the stations. These relays bring about the re-energization of the line relays at all stations to conclude the first element of the code transmission. Re-operation of the line relays energizes the counting relays OT2, T2, the relay OT2 closing a circuit for one of the line control relays OTX, OTY, OTZ over contacts of operated relay OSB corresponding to the operated relay OSA to determine the character of the next signal element. When the relay OTX, OTY or OTZ is operated the line circuit or circuits are opened to produce similar release operations of the station line relays. Release of the control station line relays operates an OSD relay which pulls up the next counting relay OR2 and consequently re-establishes the line circuit. Release of the station line relays also pulls up the next relay in the station counting chain and thereby re-establishes the line conditions. Upon re-establishment of the line conditions the third element of the code is initiated, the corresponding counting relays OT3, T3 being operated to again operate either or both of the line control relays in accordance with the operated OSB relay. The appropriate line circuits are again opened and a relay OSD characteristic of the 2nd and 3rd impulses is operated. Relays OR3, R3 in the chains also are pulled up and the line conditions are restored. The next impulse is transmitted in a similar manner with the result that a relay OSD at the control office characteristic of the 2nd, 3rd and 4th impulses is operated together with an SD relay at one of the outlying stations characteristic of the 4th impulse. Corresponding counting relays are operated to re-establish line conditions and initiate the transmission of the 5th impulse. This impulse brings about the operation or release of the substation relay 5Y, in accordance with the operation of a control button at the office. The 6th and 7th impulses are transmitted in a similar manner, the former effecting operation of one or 'other relay of the control office relays 06X, O6Y and of the substation relays 6X, 6Y according to the setting of a control lever and the latter similar selecting corresponding relays in the pairs O7X, O7Y; 7X, 7Y. The 8th impulse is then transmitted and the final relays OR8, R8 of the counting chain are operated. The effect at the control office is to release operated OSA relay while at the selected outlying station a relay D is operated to pull up relay 5YS, and relays in the pairs 6XS, 6YS; 7XS, 7YS which are selected by the relays 6X, 6Y, 7X, 7Y. At the end of the 8th impulse the line circuits are again restored t'o complete the code'signal. A plurality of control signals may be stored simultaneously on the OSA relays, the corresponding codes being released successively. A control code may be stopped at any time before completion by operation of the "start" button. Stored signals may be cancelled by a " cancelling " kev 150. Control of substation apparatus. The relay 5YS responsive to the 5th impulse controls the " call-on " signal IRC while the relay 6XS or 6YS selected in accordance with the 6th impulse operates a relay IWR in one direction or the other to control the operating motor 1m of the points 103. When the points are reversed the switch 106 is thrown over to cut out the motor. The circuits of the motor include thermal relays 111 which operate to prevent further running of the motor in the event of an overload or closure of the circuits for a time longer than a predetermined duration. The selected relay 7XS, 7YS controls, in accordance with the character of the 7th impulse, the east- or west-bound signals IRA, IRB ; ILA, ILB. The particular signal operated in each pair depends upon the position of the points 103. Signal safety arrangements. If the signal IRA is at proceed and a train enters section b, d relays ITR, ITP release and cause the restoration of the signal to its " stop " position. The signal can then be again operated only by the transmission of a further code from the control office. Release of code signalling equipment. At the conclusion of code transmission slow relays OLO, LO at the control office and substations release and open the locking circuits of all the selecting and code determining relays to restore the equipment to normal. Signalling condition of substation equipment to control office. When a relay such as IRH controlling the railway signals is operated, a " start " relay SA is energized to pull up SB and operate M, M1, Fig. 7. The relay M opens the line circuit to subsequent stations and connects the line wires XL, YL to the common return ZL ready for signal transmission. The first impulse is produced either by opening line XL or YL and effects control of relay OIX at the control office, the operation of the counting relays being similar to that previously described. The 2nd, 3rd and 4th impulses are then transmitted, the nature of the impulses being characteristic of the sending station as determined by bus-bar connections at that station, the impulses selecting a relay OSD at the office to select the appropriate indicating panel. The 5th impulse is characteristic of the occupied or non-occupied condition . of the advance section of track and effects operation or release of O5X at the control office. Similarly the 6th and 7th impulses indicate the positions of the points and signals and pull up selected relays in the groups 6X, 6Y ; 7X, 7Y ; O6X O6Y; O7X, O7Y. Upon the transmission of the 8th impulse selected relays OD, OD1 are operated in accordance with the selected OSD relay to pull up relays in a group HWK .. RGK and operate corresponding indication lamps. At the end of impulsing relays OLO, LO release to bring about the release of all station and office control relays. Relays AK, TK are controlled in accordance with the character of the 1st and 5th impulses to operate or extinguish the track section lamps 147, 148. The indications concerning the condition of track apparatus are maintained until a new selective operation progresses as far as the operation of the final counting relay OR8. A bell 149 is provided to signal occupancy of the approach rail section. The indicating equipment may include graphic recording apparatus the pens of which are controlled by electromagnets 151, 152 operated by the section relays AK, TK. Each codin