BE531956A - - Google Patents

Description

       

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   The present invention relates to a remote control installation and more particularly to a centralized traffic control installation for railways. The installation according to the present invention comprises a central station and several stations connected by line wires, through which pulse coded signals are transmitted to actuate certain devices intended mostly for controlling traffic and arranged along the track, as well as to indicate to the central station the position or the state of these devices.



   The present invention is an improvement of the plant described and shown in the patents of the United States of America.
N 2,411,375 and 2,442,603 of November 19, 1946 and June 1, respectively
1948. The installation according to the present invention is therefore of the time-coded type, which uses long and short element codes transmitted only one at a time on a single line circuit.



   The elements constituting the installation according to the present invention are preferably assembled in the form of coding, storage and extension groups, which each contain a group of relays. The installation uses a station coding group at each station location to transmit control codes and to selectively receive control codes; as well as expansion groups, as required, to associate the devices at this location with the station coding.

   The central station equipment preferably comprises an individual control panel for each group of traffic control devices, and a coding group which is connected by the line circuit to the station coding group to selectively establish communication between each. panel and the corresponding group of stations.



   In most installations of this type currently in use, including those described in the two patents mentioned above, the length of all command and control codes is determined by a fixed number of pulses, for example 16 Normally, the first half of each code is needed to provide each station with a coded and distinct call sign. This selection of stations is necessary for the control codes to be selectively received by the appropriate station, and for the control codes to be stored on the correct panel of the central station.

   Since the last pulse of the code is necessary to reset the installation to zero, only seven pulses of the sixteen pulses generally used are thus available to fulfill the command and control functions. If the number of devices to be controlled and monitored at a station exceeds seven, then it is necessary to use an entire additional code, assigning a separate, coded station call code to each additional group of seven functions. Additional storage and selection equipment should also be provided at the station.



   In the past, seven code pulses have generally been sufficient to fulfill the desired command and control functions in the stations of most centralized traffic control systems (systems designated by the abbreviation CTC. However, as a result of the Increasing complexity of railway signaling systems, the need for additional code pulses at stations is increasingly felt particularly to provide additional control indications with the aim of increasing efficiency of the installation.

   Since the number of call signs available with a single central station coding group is mathematically limited, this number being equal to 35 in a sixteen pulse coding system, the use of additional station identification codes, in many stations, may require more than one section of line, where one section might otherwise have been sufficient. This requires additional coding equipment at the central station and at the same time, either more line wires,

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 or high-frequency carrier current equipment, all of which increases the cost of the installation.



   It would be clearly advantageous to be able to provide a station with additional code pulses as desired, without having to use another station identification code and with minimum additional equipment. In other words, the flexibility, which would allow a station to use the regular code with any desired length, would increase the efficiency and utility of the signaling system, while lowering the cost of the installation. It would also be desirable to be able to use command and control codes of different lengths at any station, each code comprising only the number of pulses necessary to fulfill the desired functions, without any of them being limited to. an exact multiple of any base number such as eight.

   Thus, the codes would not be limited to lengths corresponding to 16, 24, 32 or 40 pulses; moreover, one could transmit a greater number of codes per unit of time, which would constitute a definite advantage in a congested installation.



   However, to maintain the flexibility of current systems, the ability to change the code length as desired must be realized with items of equipment that are standardized at all stations; that is, coding groups and code extension equipment must be of identical design for all stations, so as to maintain the interchangeability of parts.



   If we want to achieve an installation of this kind, with codes whose length can be modified according to the needs of the different stations in the field, and even with the possibility of obtaining command and control codes of different lengths. for any station, some means must also be available to synchronize the termination of the coding action. In other words, the coding action at the central station must stop on the appropriate pulse for each station, regardless of the particular length of the code. This is especially true during control codes, when it is necessary to stop the coding action simultaneously at the central station and at the field station in order to properly reset the installation and prevent loss. or incorrect registration of the following codes.

   Such synchronization means must be capable of performing such an action on a selective basis depending on the station for which the code is intended.



   The object of the present invention is therefore to provide, in an installation of this type, a method for extending the code to any desired length, at any station, in order to carry out additional commands or controls, and this without using additional station designation codes.



   To achieve this goal, the invention provides for adding relays to the counting chains of the coding group in order to extend the coding action and thus to produce additional code pulses.



   The invention also proposes to provide an adjustable means for terminating a code on any even pulse after station selection, whereby the command and control codes can have different lengths at a station, and at the same time a different length from that of codes similar to other stations, each code comprising only sufficient pulses to transmit the desired functions.



   The invention is characterized by the fact that, to achieve this goal, it provides at the central station and at each station a means for energizing the last relay of the counting chain as soon as all the functions have been transmitted, thus terminating the code. .

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   The invention also aims to keep items of equipment identical to the different stations while achieving the characteristics mentioned above.



     The installation according to the invention also comprises an appropriate means for synchronizing the resetting of the coding groups of the central station and of the station at the end of the control codes, so that the group at the central station and the group of stations terminate the coding action on the code pulse marl, regardless of the length of the control code transmitted by any station.



   In accordance with a further feature of the invention, the delivery of all control indications to the central station takes place without increasing the number of intermediate registration relays in the central station coding group above the number used. in current installations.



   Another characteristic of the invention resides in the fact that all the coding groups of all the stations are identical, as are all the code extension groups; all central station groups, in applications requiring more than one line section, are also identical.



   The other objects and characteristics of the invention will appear in the description which follows.



   A particular embodiment of the installation according to the invention will now be described.



   Certain characteristics of the installation shown in the accompanying drawing and described below do not form part of the invention; they have been described in the patent application filed in Belgium on the same day by the applicant for "Remote control installation, particularly for centralized control of traffic in railways.



   If we now consider the accompanying drawing, we see that Figures la, 1b, 1c and 1d juxtaposed to each other in this order, with Figure 1a to the left, show in a condensed form the central station equipment used in a embodiment of the centralized traffic control installation according to the invention. The device shown in Figures la and 1b generally comprises the central station coding group; it is enclosed in a cabinet known under the name of "central station line coding group" and hereinafter referred to by the reference OLC. On the contrary, the pulse transformer RT, the batteries, the low pass filter OLPF and the disconnect button DB shown in figure 1a are preferably mounted outside the OLC group.

   The device shown on the left in FIG. 1c comprises part of the "pyramid" circuit of the central station. The right side of the figure shows the circuits and the equipment used to increase the length of any code, including the adjustable connections to give the command and control codes different lengths for any station. Figure 1d shows two individual panels of a C.T.C. installation, which contain the levers, pushbuttons, track diagrams and lamps for commanding and controlling a group of traffic control devices at a station. The selector relays used to associate these two panels with the central station coding group are shown in the lower right part of figure 1c and in the lower part of figure 1d.

   It is understood that each panel or group of panels, in a C.T.C. installation, is connected in a similar way to the OLC groups, but by means of a different arrangement of the selection relays.



   Figures 2a, 2b, 2c, 2d and 2e juxtaposed in this order,

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 with figure 2a on the left, represent the corresponding device of a characteristic field station, in the case where only one code extension group is needed to activate the command and control devices at this station. control. The device of Figures 2a and 2b and the left part of Figure 2c comprises the station coding group. As seen by the phantom lines in Figures 2a and 2c, most of this device is generally enclosed in the cabinet of a line coding group, commonly referred to as an "LC group".



  This LC group includes, the device to the right of the phantom part of FIG. 2a, the entire device of FIG. 2b and the device to the left of similar phantom lines of FIG. 2c. In the right part of FIG. 2c, a code extension group is shown in phantom; this group is added to this station so that all commands and controls can be executed by a single code. FIG. 2d includes a diagram of channels showing a typical installation which can be controlled by a station. This figure shows schematically the needles and the signals necessary to control the movement of the trains to an interlocking which is the center of an arrangement of "overlapping" connecting tracks.

   The remainder of Figures 2d and 2e show the station group relays which can be used to command and control the typical traffic control devices shown in the drawing. Of course, for this channel diagram, only the relays and circuits necessary to illustrate the operation of the coding device have been shown, and that the dotted lines have been conventionally used to represent the connection of the various devices. . Note that the interlock @@ e @@ ent, with its track devices shown in Fig. 2d, is the one controlled by the C.T.C. shown in Figure 1d.



   Figure 3 shows part of the code extension circuit shown in the right-hand part of Figure 1c. Additional station selection relay contacts have been added to these circuits, with corresponding adjustable connections for stations other than that shown in Figure 2. This facilitates the explanation of the timing of the code stop actions by. the central station and the stations in the field, synchronization making it possible to produce codes of different lengths.



   Figure 4 is a composite view of the adjustable connections required at stations, whose call signs are shown in Figure 3, to complete control codes at each station on the pulse that has been selected.



   The same reference characters designate the same parts in the different figures of the drawing.



   If we first refer to Figure la, we see that the letters Y and Z designate two line wires which extend from the central station to several stations in the field. At the particular station used to represent the operation of the installation, these Y and Z line wires appear in Figure 2a. These two wires make a line circuit for the C.T.C. in accordance with the invention and can also be used as telephone and telegraph wires, as has been indicated with regard to the wires designated in a similar manner in United States Patent No. 2,303,875 of December 1, 1942.



   This line circuit, as seen in the drawing, is normally excited by a current supplied by the battery 77 of the central station; the positive terminal of this battery is normally connected to the line wire Y and its negative terminal to the line wire Z, through the rest contacts b and d of a polarity change PC relay, similar contacts of the emitter relay 01T from the central station and finally the coils of a

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 appropriate OLPF low pass filter. Control codes are transmitted by opening and closing the line circuit by periodic operation to the OIT relay.

   The line circuit also comprises the resistors R1 and R2 of the central station, and the primary windings of a pulse transformer RT by means of which the line relay OR of the central station is controlled on reception, of control code .



   The OR relay is of the so-called "polarized" or "magnetically-held" type which was described in US Pat. No. 02,303,875 mentioned above. The arrangement of this OR relay is such that, when the current passes through one or the other of its windings in the direction of the arrows, its armature passes to its normal position by closing its normal or left contacts. The flow of current in the opposite direction, through one or the other of the windings, causes the closing of the reverse or right-hand contacts. Thus, the OR relay responds to pulses of alternately opposite polarities which are supplied by the transformer RT when the line current varies as a result of the operation of the station transmitter relay 1T, shown in FIG. 2a.

   The control codes are transmitted by operating the 1T relay to connect the line wires together periodically, through a relatively low impedance compared to the normal impedance of the line circuit. This low impedance comprises the coils of an LPF low-pass filter similar to that of the central station and interposed between the line and the station apparatus.



   At each station, as seen in Figure 2a, a high resistance R line relay is tap-connected across wires y and Z and in series with resistor R3; this connection normally comprises contacts b and d in the rest position of a master relay M and the coils of the low-pass filter LPF. The line relays R of the stations are of the polarized type and are normally excited in parallel by the current supplied by the line battery 77 of the central station. Each relay R closes its left or normal contacts! Il: and b when its left terminal is positive, and closes its right or "reverse" contacts a and b when it is energized in the opposite direction, with its right terminal positive, or when he's not excited.

   In other words, when the current passes through the winding of the current R in the direction of the arrow, its armature is actuated to close its normal contacts, that is to say its left contacts. When current flows through the relay winding in the opposite direction to the arrow, or when no current is flowing through it; the armature of the relay is polarized to close its right-hand contacts or reverse currents. The connection of the station device to the Y and Z line wires is controlled by an RPP "fault" relay, in a manner which will be explained later, but as this relay does not intervene in the normal operation of the system. , it can be assumed for the moment that it remains in its normal excitation position shown in the drawing.



   The system according to the present invention is designed to use codes normally having sixteen pulses, when transmitting to a current field station or when receiving from that station, which requires only such a code of standard or normal length. However, this system makes it possible to extend, that is to say to lengthen the codes, according to the needs of the stations which require additional command or control pulses to transmit all the necessary functions. It is also possible to shorten the codes below sixteen pulses, as will be explained a little later.



   In each command code supplied by the central station transmitter relay OT, the line circuit is open during each odd-numbered pulse and closed during each even-numbered pulse. The character of each transmitter pulse, which is short or long, is determined by the time interval during which the transmitter relay 01T

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 is excited or not excited.

   More particularly, the central station coding group is enabled to transmit a control code by energizing the master-relay OM of FIG. 1a; this relay completes the circuits intended to produce the periodic operation of the associated transmitter relay 01T, with the aim of opening and closing the line circuit and consequently to activate the line relays R simultaneously at all the stations during the opening periods and closure both constituting elements of the code. The OIT relay is alternately energized and put back to rest to produce short pulses of the code, by the rest contacts of the counting chain relays connected in series. As will be explained a little later, the long and odd pulses are produced by keeping the relay 01T energized by different holding circuits.

   A second transmitter relay is added, the 02T relay responsible for participating in the setting of the code pulses, as was explained in US patent 2,442,603 already mentioned above. The 02T relay is energized when the OIT relay energizes itself. When it has fallen back to rest, the 01T relay cannot be energized again until the 02T relay has dropped out. Thus, the duration of the even pulses is determined by the fall of relay 02T. which is kept energized by holding circuits analogous to those of relay 01T to produce the long and even pulses. At the station in the field, the transmitting relays 1T and 2T control the transmission of the control codes in a similar manner, as will be explained a little later.



   When the line circuit is opened to start the first element of a code, each line relay R drops out and its reverse contact b closes a circuit from the positive terminal B of an appropriate local source of direct current through the wire 174, contact d in the rest position of relay CS, wire 175, contact a in rest position of relay 2L, contact d in rest position of relay LBP, the winding of relay 1L and finally the negative terminal N of the direct current source.



  The armature of relay 1L is then attracted and its contact a in the working position closes a circuit passing through terminal B, the reverse contact b of relay R, wires 174 and 175 and the rest contact d of relay CS which is has just described, the winding of the relay 2L and finally the terminal N, so that the armature of the relay 2L is energized and closes an obvious holding circuit by its own contact â in the working position. Excitation of relay 2L also closes a circuit passing through terminal B, the contacts e in the working position of relays 1L and 2L, the winding of relay LP and terminal N. The resulting attraction of the armature of the LP relay in turn closes a circuit passing through its own contact a in the working position, to energize the LB and LBP relays, whose armatures are then attracted.



  The LBP relay is energized in tandem with the LB relay, when the contact of the latter in the working position closes, so that these relays drop successively when the LP relay is no longer energized.



   When the armature of relay 2L is attracted by the first pulse of a code, its contacts a and d pass the connections, resulting in the winding of relay 1L, from the reverse contact b to the normal contact b of relay R, then contact d in the working position of the LBP relay closes to maintain this last connection until the code is terminated. It follows that the relays IL and 2L are energized alternately, the relay 1L via the normal contact b of the relay R, and the relay 2L via the reverse contact b of the relay R, in response to periodic operation. of the armature of relay R.

   Relays IL and 2L remain energized for the duration of the short pulses of the code, relay 1L dropping during each long pulse of odd number and relay 2L during each long pulse of even number.These relays are therefore used to indicate the character of the code received and also, in cooperation with the LP relay, to control the length of the long pulses of a code generated by the associated transmitting relay T. The LB relay and its repeating relay

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 tor LBP are transition relays; each of them keeps its contacts closed in the working position for the duration of a code; it is used to prepare different local circuits when the coded operation of relay R begins and to open them when this operation ceases.



   The line relay OR of the central station, shown in figure la, controls an analogous group of timing relays 01L, 02L, OLP,
OLB and OLBP These relays operate in a manner analogous to that which has been described for the field station. However, the OR relay is normally not energized and, like a magnetic hold type relay, it can hold its contacts in either position, in which they were placed by a momentary pulse. It can therefore be accidentally reversed. If this happens, the OR relay is automatically brought back to its normal state by the action of the time relays in a manner which will be explained later.

   It can therefore be assumed that the OR relay, although not energized, occupies its normal position corresponding to that of the station line relay R normally energized when the system is in its normal or idle state, it is that is, when no code is transmitted in either direction.



   When the OR relay receives control codes, it is actuated by pulses of alternately opposite polarities, which are supplied by the transformer RT. During the transmission of the control codes, the master relay OM (figure la) is kept energized and its contact c, bypasses the secondary of the transformer RT and disconnects it from the relay OR, which is then locally controlled by the transmission relay 01T.

   When the OM relay energizes, the OR relay also energizes in the normal direction, as seen in the drawing, through the circuit passing through the midpoint 0 of the local battery 78, the lower winding of the relay, contact e in the rest position of relay 01T, contact e in working position of relay OM and finally the negative terminal N of the local battery.



   The OIT relay is energized via the work contact d of the OM relay. By getting excited, it closes its work contact c and thus energizes relay 02T. These two relays are then controlled respectively by the wires 61, 68 and 70 and by the wires 62 and 71 respectively, in a manner which will be explained later, in order to generate the code.



   Whenever the OIT relay is energized it opens the line circuits at its contacts b and d in the rest position, to release the line relays R at the stations, and it connects the line wire y to the line wire Z through the contacts correspondents in working position. through resistor R4, to produce the line load current. This latter action is especially desirable when the line or any part of it is in a cable. At the same time, relay 01T switches the armature of relay OR to its reverse position by the current flowing through the circuit, which passes through the positive terminal D, contact e in the working position of relay 01T, the lower winding of the OR relay in the opposite direction to the arrow, and finally terminal 0.

   Each time the 01T time delay relay lets its armature drop, it closes the line circuit to switch the armatures of the R line relays to the normal position, and at the same time switches the armature of the OR relay to the normal position by closing the circuit which extends from terminal 0 of the local source through the winding of relay OR and passes through contact e in the ON position of relay OM to end at terminal N. The mature ar OR thus operates simultaneously with the armatures of the R relays during the transmission of the command codes.



   Each line relay controls a chain of counting relays by circuits generally analogous to those of the already mentioned American patent 2,411,375. Thus, the OR relay controls, by means of

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 ae its contact a, chain relays ae count 01 to 08 and OCS ae in figure 1b, and extension count chain relays 16, 17-21, 18-22 19-23 and 20 in figure 1c. Each relay R controls an analog counting chain.

   When the extension group is not used, the station count chain only includes relays 1 to 8 and CS in figure 2b. When using an extension group, such as the one shown in Figure 2c, relay R also controls counting chain extension relays A through 4A inclusive.



   As will be explained during the remainder of the description, some of the relays in the counting chain not only count a particular pulse of a code, but also have a secondary role consisting of preparing circuits to bring back the count. coding action in order to use certain counting relays again or to extend the coding action by using extension relays. Thus, the central station relay 08 and the station relay 8 not only count the eighth pulse of a code, but also prepare circuits to bring back the coding action in order to use the relays respectively again. 01 to 07 and 1 to 7 and count the pulses 9 to 15.

   The central station relay 16 and the station relay A not only count the sixteenth pulse of the coae, but prepare circuits to extend the coding action beyond the sixteenth pulse by using the extension relays respectively. 17-21 to 20 and 1A to 4A. which count the pulses 17 to 20. The relays 20 and 4A have a secondary role similar to that of the relays 08 and 8, that is to say the preparation of circuits to use again respectively the relays 17-21 to 19- 23 and 1A to 3A to count the pulses 21 to 23.

   If the coding action is to have a duration longer than twenty-four pulses, a relay 24 of the central station and the relay A of a second extension group of the station function as the relays 16 and A mentioned above. above. The function of the OCS and CS code stopping relays, which both become the final relay in the chain corresponding to the relay, will be described below.

   The number of counting chain relays at a station varies according to the maximum number of pulses necessary for the command code or the corresponding control code, as will be explained later, At the central station, the number of relays of the Count chain should match the largest number of relays in the similar chain to any station on the line circuit.



   Note, however, that relay 08 and an OCR chain repeat relay at the central station, or relay 8 and a CR chain repeat relay at the selected station, are energized at the end of the first cycle of the operation of the chain. counting of the coding group. Chain repeater relays are needed, as will become apparent from the remainder of the description, to prepare for various associated actions occurring on the eighth pulse and also to participate in the rollback of the coding action for a cycle of. repetition. The chain repeater relay is kept energized for the remainder of the code to put other circuits in use to extend the coding action and to control delivery of the various functions.

   Analogue chain repeater relays, the OCRA relay at the central station and the CRA relay at the station, are used to allow the circuits to produce a repeat action of the extension count chain. These relays are energized on the same pulse as relay 20 of the central station and relay 4A of the selected field station. Once energized, they remain energized for the remainder of the code to participate in a further extension of the coding action and delivery of the various functions during code extension pulses.



   If we now consider Figures 2a and 2b, we see that an excitation circuit of relay 1 is momentarily closed in response to the first of a series of operations of relay R. This circuit passes through the

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 terminal B, reverse contact to relay R, wire 171, contact c in rest position of relay CS, wire 172, contact b in rest position of relay LBP, contact g in working position of relay 1L, resistance
 EMI9.1
 R7, wire 156, the winding to relay 1 and finally terminal N. Relay 1 therefore energizes under the action of the first pulse of a code after energizing at relay 1l. When the LBP relay is energized, opening ae its contact b in the rest position cuts off the circuit just indicated and closes a circuit holding relay 1.

   This holding circuit goes through terminal B, reverse contact a to relay R, wire 171, con-
 EMI9.2
 tact in rest position of relay CS9 wire 172, contact b in working position of relay LBP9 resistor R8 wire 157, contact 12 in rest position of relay 2, contact a in working position and relay winding 1, and finally terminal N. When relay R goes to its normal position to start a second pulse of the code, terminal B is disconnected from relay 1, which however remains energized thanks to the discharge circuit provided by the half rectifier. alternation connected to wire 157.



   A circuit is now closed passing through the bor-
 EMI9.3
 ne Bd the contact in the normal position of the relay Re the contact g in the working position of relay LBP9 the resistor R99 the wire 158. the contact a in the rest position of relay 8, the working contact b of relay 1, the relay winding 2 and finally the N terminal. Relay 2 therefore energizes and closes its ae maintenance circuit passing through terminal B, wire 158, its own contact !! in working position and contact b in rest position of relay 3. Operation of contact b of relay 2 disconnects the relay
 EMI9.4
 1 of the half-wave rectifier and closes a second discharge circuit for relay 1 through the winding of relay 3.

   Consequently, relay 1 drops out for a short time after relay 2 has been energized, but without providing a spark to. its contact a, the drop of which connects relay 3 to wire 157 to put this relay in a state to respond to the third pulse of the code. The third pulse begins when the relay R
 EMI9.5
 goes back to the reverse position by closing its cottact a in the reverse position, to supply current to wire 157 via a circuit previously defined as forming part of the holding circuit of relay 1. This circuit passes through contact a in the rest position of the relay 1 and contact b in the working position for relay 2 and crosses the winding of relay 3 to end at terminal N. Relay 3 is thus energized.



   Relays 4 through 8 inclusive are controlled in an analogous manner, one at a time, by current flowing alternately into wires 157 and 158 in response to pulses 4 through 8 inclusive of the code. If the various operations associated with these code pulses, as will be explained later, are performed correctly, a chain repeater CR relay is energized by the eighth pulse.

   This prepares for relay 1 an excitation circuit passing through contact b in the working position of relay 8, so that relay 1 operates immediately after relay
 EMI9.6
 8, this circuit also comprising the contact g in the working position Cm relay CR and the contact a in the rest position of the relay 7. The relays 1 to 7 inclusive are then controlled by means of a second cycle under the action of the pulses 9 to 15 of the code.



   On the sixteenth pulse of the code., The first relay of the extension counting chain, that is to say the relay A placed in the extension group, is energized in place of the relay 8. The circuit of this relay A is energized through wire 158, the rest contact a of relay 6, the con-
 EMI9.7
 working contact.! 2 of relay 7.gle/ working contact h of tel-7 to CR, resting contact g of relay 8j wire z, the winding of relay A and terminal N. When relay A is on energizes it completes a holding circuit passing through its
 EMI9.8
 own contact ag wire 158.9 wire 205 and rest contact b of relay 1A.

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   When relay A closes its make contacts, a circuit is prepared to energize relay 1A on the seventeenth pulse of the code.



  This circuit passes through wire 157, the work contact g of relay CR, the rest contact a of relay 7, the rest contact b of relay 8, wire 207; the working contact b of relay A, the winding of relay lA and terminal N.



  When relay 1A is energized, it establishes a holding circuit by its own work contact a, the rest contact b of relay 2A, wire 208 and wire 157. It can therefore be seen that the excitation of relay lA is analogous. to that of relay 1 on the ninth pulse. The equipment is now also prepared so that the other relays of the counting chain of the extension group are energized in a manner analogous to relays 2, 3 and 4 of the counting chain of the LC group. The relays 2A, 3A and 4A are energized respectively on the pulses 18, 19 and 20, in a manner analogous to that described above, due to the action of the relay R which follows the code.



   On the other hand, the action produced after energizing relay 4A is very similar to that obtained when relay 8 energizes at the end of the first operating cycle of the LC group counting chain. It has already been indicated that the CRA relay energizes on the same pulse as the 4A relay, that is to say on the 20 pulse. In conjunction with the 4A relay, the CRA relay prepares a circuit so that the relay lA follows relay 4A in the action of the counting chain. This circuit passes through wire 208, the working contact b of the CRA relay, the rest contact a of the 3A relay, the working contact b of the 4A relay, the winding of the lA relay and the N terminal.



  Thus, when relay R switches to the reverse position on the twenty-first pulse of the code, by closing its reverse contact a, relay lA is energized in the same way as relay 1 following relay 8 on the ninth pulse code.



   Relays 2A and 3A follow relay 1A if the coding action continues, energizing on the twenty-second and twenty-third pulse of the code, respectively. It is obvious that the coding action of the count string could be extended indefinitely by adding extension groups. In a second extension group, a second relay A would be energized on the twenty-fourth pulse of the code, by means of a circuit passing through wire 205, the rest contact a of relay 2A, the working contacts h and e respective relays 3A and CRA, and the rest contact e of relay 4A. This would then be followed by the energization of relays 1A, 2A and 3A of extension group N 2.



   The field station group coding operation continues until, as will be explained below, the OR relay of the central station remains in the normal position and the station relay R therefore also remains with its contacts in normal position. At this time, the device is returned to its normal state of rest. When the station receives a command code, it is not necessary for the code stop relay CS to be energized, since the device will return to its initial state without operation of this relay. The operation of the CS relay terminating the transmission of a control code from the station will be described later.



   If we now refer to Figures la, 1b and 1c, we see that the central station counting chain circuits are similar to those just described for the station. Relay 01 receives current on the first pulse of the code through wire 75 and is energized. The other relays 02 to 08 are actuated successively by the current supplied alternately by the wires 98 and 90, in response to the periodic operation of the relay OR. The central station OCR chain repeater relay energizes on the eighth pulse to prepare circuits to re-energize relay 01 on the ninth pulse and initiate a repeater cycle of operation of relays 01 through 07.

   The OCR relay also prepares circuits to subsequently energize the relay 16, which is external

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 to the OLC group. At the central station, relay 16 takes the place occupied by relay A at the station. This relay 16 operates on the sixteenth pulse to prepare circuits for energizing on the seventeenth pulse the extension relays 17-21, which are also external to the OLC group.



   Relays 18-22, 19-23 and 20 follow in this order the relay 17-21, in the same way that the relays 02,03 and 04 of the OLC group follow in this order the relay 01. The relay 20 is also analogous to relay 08, in that it has a secondary role in the counting chain action and acts in conjunction with the OCRA repeater relay, which also energizes on pulse 20. Circuits are then pre - prepared by these two relays so that relay 17-21 is energized on pulse 21 following relay 20. Relays 17-21, 18-22 and 19-23 repeat as follows in this order pulses 21 to 23.



   Obviously, one could extend the code as many pulses as one wanted by adding additional relays to the extension count chain. A relay 24 would be provided to be energized on the pulse 24, in the same way as the relay 16. The energization of the relay 24 would be controlled from the wire 90 passing through the resting contact a of the relay 18- 22, the work contact h of relay 19-23, the work contact f of the OCRA relay and the rest contact ± of relay 20. The coding action would then continue and end when all the functions have been received or transmitted.



   At the central station, however, it is necessary that the OCS code stop relay be energized on the final impulse of each code, both when the central station transmits a command code and when it receives a control code. A repeater marten-relay, the OMP relay, is provided to distinguish between these two types of code. As will be explained later, circuits are formed by the make contacts h of relays 01, 03 or 05, the make contact b of relay 07, or the make contacts h of relays 17-21 or 19-23, the contacts work of the station selector relays, and a work or rest contact of the OMP relay depending on whether it is respectively a command code or a control code, in order to energize the OCS relay on the final pulse any code.



  When the OCS relay is energized, the opening of its rest contact µ cuts the holding circuit of the master relay CM. The fall of this relay causes the end of a command code. During a control code, the opening of the rest contact c of the OCS relay causes the PC relay to drop, which returns the entire system to zero. A more detailed explanation of this action will be given later.



   We will now describe the transmission of a control code step by step by the device of the central station (Figures la, 1b, 1c and 1d).



   To start a control code, the operator momentarily presses a start button 234 STB, shown in Figure 1d and identifying the control panel associated with the station storage group to which the code is to be transmitted, in order to activate thus a starting relay such as relay 234 ST. The 234 ST relay drive circuit goes through terminal B, the now closed contact a of the 234 STB start button, wire 67, the coil of the 234 ST relay, the normally closed contact of the CB cancel button and finally the N terminal. The utility and use of the CB cancel button will be briefly described.

   Relay 234 ST is kept energized by a holding circuit passing through terminal B, the contact in rest position f of an associated panel selector relay, such as relay 234 S, the contact in working position a of relay 234 ST , the winding of this relay, the contact of the cancel button CB and finally the terminal N. Thus, the relay ST is kept energized until the desired selection has been made.



   Wire 47 (figure le.) Is normally connected, by the contacts

  <Desc / Clms Page number 12>

 in the rest position of the various E, F and G selector relays, with branches extending to contact b of the start relay ST of each panel. Closing the contact in the on position b of relay 234 ST consequently establishes the connection of the neighboring terminal B to a particular branch, which includes the contacts in the off position g of relays 23G, 2F and E, and ends at wire 47. If the system is in its normal idle state so that the 01L and 02L relays are not energized, a circuit is established by the wire 47, the contacts in the idle position b of the 01L and 02L relays;

   the winding of the OM relay, wire 17, the normally closed contact of the CB cancel button and finally the N terminal. The OM relay therefore energizes in response to the operation of any starting relay, such as the 234 ST relay.



   The previously mentioned CB cancel button is provided to allow the operator to immediately correct an error. When this button is pressed, the N terminal of any energized relay ST is disconnected, which consequently falls back to the idle state. The device therefore returns to its original position, so that the operator can correct his error and restart the coding action by acting on the associated start button STB. Since the connection of the CM relay to the N terminal of the source is made also by the cancel button and by the wire 17, the manipulation of this button at any time of the code produces the interruption of the command code and the reset. of the device in the starting position.

   On the other hand, since all the ST relays are connected to terminal N by the same cancel button, the entire central station device is reset by manipulating the CB cancel button, which removes all code actions and releases all "stored" start relays that are to say, having been energized to store a code.



   The activation of the OM relay completes a pulse circuit for the 01T transmission relay of the central station; circuit passes through terminal B, rest contact g of relay 19-23, rest contact g of relay 17-21, wire 94, rest contact e of relay ces, rest contacts g of relays 07, 05, 03 and 01, wire 68, work contact d of relay OM, rest contact b due to relay 02T, the winding of relay 01T and terminal N. The relay OIT therefore energizes to start the first pulse of the code. , its rest contacts b and d opening the line circuit to drop the station line relays R, and its work contact .2 completing a circuit defined previously to switch the OR relay to its reverse position.

   The second transmitter relay 02T is also energized by a simple circuit completed by the closing of the work contact c of relay 01T.



   The operation of the OR relay energizes the OL chain of time relays and the first counting relay 01 as has already been explained.



  When the OLB and OLBP relays are energized, their work contacts c complete a circuit for maintaining the OM relay. This circuit passes through terminal B, the rest contact e of the OCS relay, wire 156, the work contacts c in parallel with the OLB and OLBP relays, the work contact a and the winding of the OM relay, wire 17, the button CB suppression and terminal N.



   The first pulse of each control code is a long pulse, so as to distinguish this mode from a control code, in which the first pulse is relatively short. When relay 01T energizes, followed by relay 02T, a holding circuit is completed by work contact a of relay 01T, work contact b of relay 02T, work contact d of relay OM, wire 68 and finally the pulse circuit described above. When relay 01 is energized on the first pulse, its rest contact g opens this pulse circuit of relay 01T, but the latter is kept excited by a bypass to generate the desired first long pulse.

   This bypass used to keep relay 01T energized goes through terminal B, the rest contact g of relay 19-23, the pulse circuit defined previously, the rest contact g of relay 03,

  <Desc / Clms Page number 13>

 the work contact c to relay 01, the break contact of a relay SP, wire 61, the work contacts in parallel e of relay 01L and b of relay OR ', the work contact a and the winding of relay 01T and finally the terminal
N. The 01L and OLP relays then drop out successively, opening on the working contact b of the OLP relay opening the holding circuit and causing the 01T relay to drop. The fall to relay 01T, in order to start the second pulse of the code, closes the line circuit, energizing the line relays R, and switches the OR relay to its normal position.



   As a result, relay 02 is energized and relay 01 drops out, as explained previously.



   The closing of the rest contact g of relay 01, during the second pulse, completes the previously described pulse circuit of relay 01T via wire 68, this pulse circuit operating repeatedly so as to generate code pulses. However, the relay
01T cannot be energized as long as relay 02T has not dropped to close its rest contact b. Thus, the relay 02T drop time is used to determine the duration of the short and even pulses of the code, since the even pulses end with the energization of the 01T relay.



  Similarly, the 01T relay drop time is used to set the duration of the short, odd code pulses, since odd pulses end when 01T relay drops out. The energization time of the 01T and 02T relays does not have a significant influence on the duration of the short elements of the code. This differs from the operation of the device of US Patent No. 2,411,375 mentioned above and this results in better control of the duration. impulses.



   The wires 61 and 70, as well as the wires 62 and 71, provide connections described in detail a little later and intended to keep the relays OIT and 02T respectively energized, in order to generate the long pulses in the code. During pulses 2 to 8 inclusive, the arrival of the current supplied by terminal B is effected by wires 70 and 71 and is controlled by the contacts of the station selection relays.



  During the eighth pulse, the OCR relay energizes, and the control of the current coming from the terminal B is then effected by the wires 61 'and 62, from the contacts of the function control levers, and through the intermediary work contacts of relays 0-IL, 02L and OLP. Thus, the length of these last pulses of the code is determined directly by the drop stop of the OLP relay. Note however that, during pulses 2 to 8, when the excitation of the various station selector relays ends the current supply, which keeps relays 01T and 02T energized during the long code pulses, the operation of these station selector relays is controlled by the 01L, 02L and OLP relays as will be explained below.

   Thus, the timed chain relays also enter into the setting of the long code pulses during the station selection portion of the code.



   The second through eighth pulses of each code can be arranged in any of 35 different combinations of three long pulses and four short pulses, to form separate call signs, which are identified by numbers. three digits in which the digits represent the long pulses of the callsign. Thus, the number 234 assigned to the individual panel ae in figure 1d and to the corresponding station storage group of figure 2 constitutes a call sign in which the second, third and fourth pulse of the code are long, while the impulses of the fifth to the eighth are short.

   The codes for the code are generated by connections starting from terminal B and work contact b of the central station starter relays ST and ending at wires 70 and 71; these are arranged so that when more than one of the starter relays are energized, their respective codes are transmitted to

  <Desc / Clms Page number 14>

 only one at a time in a given order of priority. A long element takes precedence over a short element in each pulse; in other words,
 EMI14.1
 1-'irÀdicatîf 234 is the first in terms of priority, 235 is next and so on, the code 678 being the last.



   The selection of the panel containing at the central station an excited relay ST is performed by the energization of an input relay E (figure le), in response to the first element of the code then by the energization of three relays successively by means of the -three long elements- of the callsign
 EMI14.2
 three relays include a first selector relay, a group G selector relay and a rsla3.ssé.esesccaecâi; is aoat 1zttetttified: tp; lus pertix.iax- àèéq1Ï.XeJ3, denoting the code elements that cause 1-eup to operate. ent..Pr..LexIe relay 2F- "t sensitive = BU. ùbumiàtp: elémen1il.e relay 23G to the third pism'sn'tf oursu.y.3et¯eâ.is aitiéùé BCtion # .. e; t relay 234 &:!: astb1lenati1: q.Uúw1 e: tr1ème'Jélent; '- p} 1LWV: nequele relay 23t Gi dt been act.ctQuancerseet.sstLiti.toutsa capacity: I: té,: I.i3.c:

  -a. device 1 Uses ei-nq relays z ', fifteen relays G, and treute-ixq relays S, generally arranged as seen in Figures 2.3 and 4 of the United States patent t' Apmérzqu 1 2.229t2O9 Qu January 21, 1941. Since the relations between these different relays and the connections associating the various panels with the cotl.ageB: mt '' 'groups defined in this patent, the circuits have only been represented here in a condensed form, for simplicity and only the circuits of a single panel have been shown in detail.
 EMI14.3
 and a single relay. selector of chmpe.



   Relay E is energized by the first pulse of each code by means of a circuit passing through terminal B, the contact has the OLBP relay in figure la, wire 60, the rest contact has the SP relay, the working contact d of relay 01, wire 21, the winding of relay E and terminal N. Relay E then closes a holding circuit through its work contact a; this circuit passes through the rest contact m of relay 2F, the rest contacts of relays 3F to 6F, if these are provided, wire 29, the resistor
 EMI14.4
 this R139 the rest contact ¯a of the SP relay, wire 60, the work contact a of the OLBP relay and terminal B.



   It is understood that each branch circuit starting from terminal B and passing through the work contact b of a starting relay ST to end at wire 47 identifies a corresponding call sign, as indicated by references 234 ST to 238 ST inclusive inscribed near contacts g to k of relay 23 G. When relay E energizes, these branches are all disconnected from wire 47, divided into several groups by contacts g to k of relay E and connected to wires 32 to 36 for
 EMI14.5
 prepare circuits intended to generate the first digits of the call sign.



   When relay 02 energizes on the second pulse, a circuit is completed to keep relay 02T energized. This holding circuit passes through terminal B, work contact b of relay 234 ST in figure 1c, idle contacts g of relays 23 G and 2 F, work contact g of relay E, wire 32, work contact c of relay 02, wire 71,
 EMI14.6
 work contact has relay 02T, the open contact ç of relay 01Tg the winding of relay 02T and terminal N, thus keeping relay 02T energized so as to generate a second long pulse.

   The 02L and OLP relays then drop out, completing a circuit passing through terminal B, contact a of the OLBP relay, wire 60, the rest contact a of the OCR relay,
 EMI14.7
 wire 58, the rest contacts has OLP and 02L relays, wire 6t., the rest contacts d of OCR and KSP relays, work contact d of relay 02, wire 22, work contact b of relay E , the winding of the 2F relay and the
 EMI14.8
 terminal N. When relay 2F is energized, its work contact has closed its holding circuit passing through the rest contacts a of relay 23 G and other relays G of the same group, relays 24 G to 27 G, s' they exist,

  <Desc / Clms Page number 15>

 wire 29, the circuit indicated above and including wire 60, and finally terminal B.



   With relay 2F energizing, the branches extending from wire 32 to terminal B by the contacts of the start relays, whose call signs have the number 2 as the first digit, are disconnected from the wire.
32, divided into several groups by contacts g to k of relay 2F, and connected to wires 33 and 37 in order to prepare circuits to generate the second digit of the call sign.



   Due to the fact that the connection to wire 71 has been cut by the opening of the rest contact g of relay 2F, relay 02T may drop, as a result the excitation circuit of relay 01T closes and this relay s to start the third impulse.



   Relay E drops back to the rest position following the opening of the rest contact m at relay 2F, and the resulting opening of work contacts h to k inclusive of relay E disconnects the branch circuits to generate the codes d 'call in which the first digit is 3, 4, 5 or 6.



   The relays Es F and G, and certain other relays described a little further on, are provided with a discharge circuit comprising a resistor in place of the usual half-wave rectifier. These resistors, the value of which is relatively high compared to the resistance of the relay winding, realize a slight delay in accordance with the requirements of the circuit, and also serve to prevent sparks at the contacts.



   When relay 03 is energized, a circuit is established to keep relay 01T energized so as to generate a long pulse. This circuit passes through terminal B, work contact b of relay 234 ST, rest contact g of relay 23 G, contact g of relay 2F, wire 33, work contact e of relay 03, wire 70, work contact a and the winding of relay 01T, and finally terminal N. The 0-IL and OLP relays then drop out, completing a circuit passing through terminal B, work contact a of the OLBP relay, wire 60, the rest contact a of the OCR relay, wire 58. the rest contacts d of the OLP and 01L relays wire 63, the rest contacts b of the OCR and KSP relays, the open contact of relay 03, wire 23, the work contact b of relay 2F, the winding of relay 23G and terminal N.



  Relay 23G is thus energized and its work contact has closed a holding circuit passing through the rest contacts a in series with associated relays G, wire 29, a circuit indicated above and terminal B.



   When relay 23 G energizes, the branch circuits extending from wire 33 to terminal B, passing through the contacts of the start relays, of which the first two digits of the call signs are 2 and 3, are disconnected. of wire 33, divided into several branches by contacts g to k to relay 23G and connected to wires 34 to 38 to prepare circuits responsible for respectively generating the third digit of call signs 234 to 238. Connection to wire 33 being cut as a result of the opening of the rest contact g of relay 23G, relay 01T drops out to start the fourth pulse.



   Relay 2F drops back to the rest position following opening to the rest contact a of relay 23G. The opening of the make contacts h to k of relay 2F disconnects the branch circuits which are controlled by these contacts, thus limiting the command to the third digit to the starting relays of group 234 to 238 inclusive.



   When relay 04 is energized, the connection passing through terminal B, work contact b of relay 234 ST, work contact g of relay
23G and wire 34, is extended through the work contact c of relay 04, wire 71 and, as explained previously, by relay 02T, so as to keep this relay energized to generate the fourth

  <Desc / Clms Page number 16>

 long pulse from inside call 234.

   When the 02L and OLP relays drop, a circuit is completed by terminal B, the work contact has to the OLBP relay, wire 60, the rest contact has to the OCR relay, wire 58 the frozen rest contacts OLP and 02L relays, wire 64, the rest contacts has OCR and KSP relays, work contact D of relay 04, wire 24, work contact b of relay 23 G, the winding of relay 234 S and terminal N. Relay 234 S gets excited at this moment. The closing of the working contact 3 of this relay extends the connection starting from terminal B, to the left terminal with its winding, up to wire 30, and from there through the winding of the relay SP of the central station repeater of the relay S to terminal N, so that the SP relay also energizes.

   The relay SP then completes its holding circuit passing through wire 60, its own work contact a, its winding and terminal N. Closing at the work contact a of relay SP also closes a holding circuit for relay 234 S; this circuit passes through the work contact a of the SP relay, wire 30, the work contact a of the 234 S relay, the winding of this relay and the N terminal.



   When the SP relay is energized, the opening of its break contact .5 !: disconnects terminal B of wire 29 and consequently drops relay 23G. Opening the on contact of relay 23G eliminates the current from wire 34, and consequently from wire 71, so that relay 02P drops out. The 01T relay is then energized and attracts its armature to complete the fourteenth pulse and start the fifteenth pulse.



   It can therefore be seen that, at the end of the first long pulse, the fall of relay 01T is controlled by the opening of a work contact of the OLP relay. However, in the case of the first two long pulses of a station call sign; The operation of the 01T and 02T relays is controlled by the opening of the closed contacts of the respective selector relays, each of which is energized in response to the closing of a closed contact of the OLP relay. Thus, these two long pulses are of the same length, which is slightly longer than that of the first pulse. The final pulse of a station call sign is terminated, not by energizing the corresponding S relay, but by dropping to the corresponding G relay.

   Since relay G does not drop until after the S and SP relays have cascaded energized, which occurs after the drop to the OLP relay, the final long station select pulse is longer than any of the first two pulses. This is especially necessary when this final pulse occurs on the eighth pulse of the code. If the final station selection pulse in this case ends with the energization of relay S, there would not be sufficient time before the ninth pulse to completely perform the few other actions that must occur on the eighth pulse and which will be described briefly.

   It also follows that these long pulses of the station call sign have a length slightly greater than that of the other long pulses of the code, which are terminated, as will be explained a little later, in the same way as the first long pulse.



   The opening of the make contacts 12 to f of the relay 23G causes the opening of the excitation circuits of the relay 234S and of the other analog relays 235S to 238S of the same group, which are not shown. However, the 234S relay remains energized, thanks to its holding circuit described above. The opening of the work contacts h to k of relay 23G prevents the emission of long coded elements on pulses 5 to 8 when the work contacts c of counting relays 05 to 08 inclusive ending in wires 35 to 38 close successively.



   Pulses 5 to 8 are therefore short. The 01T relay is controlled during these pulses by its described pulse circuit

  <Desc / Clms Page number 17>

 previously, which is opened or closed by the respective rest contacts g of relays 05 and 07, and by the fall of relay 02T closing its rest contact b. When relay 08 is energized, a circuit is completed by terminal B, the working contact a of the OLBP relay, the wire 60, the working contact h of the relay 08, the working contact b of the SP relay, the winding of the central station OCR chain repeater relay and finally the N terminal. The OCR relay therefore energizes on the eighth pulse, completing a holding circuit passing through its own work contact a and wire 60.

   Since the OLBP relay remains energized for an entire code, it is evident that the OCR relay, once energized, remains energized for the remainder of the code.



   The opening of the rest contact a of the OCR relay disconnects the terminal
B of yarn 58, and therefore of yarns 63 and 64, as already explained. Closing the work contact g of the OCR relay prepares a circuit passing through wire 89, the open contact a of relay 07, the working contact b of relay 08, the closed contact b of an RCL relay, the winding of the re- lais 01 and terminal N. This allows relay 01 to be actuated after relay 08. Excitation of the OCR relay also closes, through its ± and f contacts, the control circuits passing through wires 61 and 62 and the working contacts b and c of the OLP relay.

   The current coming from terminal B to keep the 01T and 02T relays energized, as will be explained, through the work contacts of the various counting chain relays, and through wires 39 to 45 or 102 to 108 from the various control levers and push buttons provided on the central station panels.



   When the 234S selector relay energizes as explained above, its contact transfers the 234ST starter relay hold circuit, from a direct connection to terminal B, to a circuit comprising wire 46 and s' extending from terminal B through the closed contact f to relay 08. As a result, the actuated start relay, such as relay 234ST, drops back to the neutral position on the eighth pulse of the corresponding command code. This has the advantage of making it possible to re-energize the start relay of any panel by momentarily activating the corresponding STB start button, in order to store a second code intended to be transmitted, dull if this is activated. button before the first code is completed.

   During reception of a control code, relay 08 and relay S of the selected panel are also energized, as in the case of the described control code, but during reception the OM relay is not energized and its contact is closed. g makes a connection starting at terminal B and terminating at wire 46, in order to prevent the fall of a "stored" start relay, such as relay 234 ST, in response to the operation of relay 08.



   Pulses 9 to 15 of the code have now been made available to control 7 of the devices at the chosen station, according to the positions of the control levers or pushbuttons of the corresponding panel, such as that shown on the left side of Figure 1d.



  When relay 234 S energizes, terminal B is connected, by contacts g to k of this relay and by wires 95 to 99 inclusive, to the lever and push button contacts, and consequently to wires 39 to 45 leading to the ON contacts f of relays 01 to 07. The OCR relay being energized, the ON contacts f of the odd counting relay relays making connections through the ON contact e of the OCR relay, wire 61, the working contacts e and b in parallel with respective relays 01L and OLP, and the holding circuit of the OIT relay. This relay can thus be kept energized until the OIL and OLP relays drop out, thus generating long and odd coded elements.

   The contacts f of the even-numbered relays of the counting chain making connections via the work contact f of the OCR relay, wire 62, the work contacts c in parallel with the 02L and OLP relays, and the previously defined holding circuit of the 02T relay. This last relay can thus be kept energized until the 02L relays

  <Desc / Clms Page number 18>

 and OLP fall back, thus generating long and even coded elements.



  These circuits are obviously only available during the second operating cycle of the primary counting chain of the OLC group and during any operation of the primary counting and extension chain.



   Before describing the control action of the various levers and pushbuttons on the coding at the central station, it will be assumed that the operator wishes to fulfill a series of determined conditions. Referring to the station track diagram, as shown at the top of Figure 2d, it will be understood that a train moving from right to left through this track arrangement is a walking train. west, and conversely that a train moving from left to right is moving east, It will also be assumed that a train moving west is approaching this interlocking arrangement on the track section 4AT, and that the operator wishes to make this train pass on the connecting track, that is to say on the section of track 2BT.

   For this, the 3W needle must go to the reverse position and the 4L signal must be in the open position. Assume that an eastbound train is approaching at the same time on section of track 2AT, but that the operator wishes to keep this train on the main line at the location of signal 2R, so this signal must remain in the closed position and the 1W needle must be placed or maintained in the normal position.



   If we now refer to the figure here, and in particular to the upper part of this figure, where two panels of the control device at the central station have been shown, with the diagram of the tracks at the top and the occupancy lamps track, it is seen that the operator, to achieve the desired movements of the trains through the considered interlocking arrangement, places the needle control lever 1SW in its left position or normal position., that is to say - say in the position shown in the drawing. On the other hand, it places the needle control lever 3SW in its reverse position, that is to say to the right. He shifted the 4SG signal control lever to its left position to open the signal controlling westward travel.

   The 2SG signal control lever must remain in its central position to keep the 2R signal closed. It is assumed that the needle heating control button WZB has been actuated previously, to activate the needle heaters, and that it remains in this position, the operator does not act on the CHB button on the contrary switch or the MCB call button, which remain with their contacts open as can be seen in the drawing.



   Having performed the necessary operations on the turnout and signal control levers, and on the various traffic control pushbuttons, the operator pushes the start button 234 STB with return spring. It has been shown previously what coding action occurs during the first eight pulses, after the operator has passed the start button 234 STB to momentarily close his contact a.



  On the next pulse, i.e. on the ninth pulse of the command code, since the 1SW switch lever is in the normal position, the battery supplies current to keep the OIT relay energized in order to obtain a long pulse of code. The corresponding circuit passes through terminal B, work contact 9 of relay 234S, wire 95, the contact in the normal or left position of the needle lever 1SW, wire 39, the work contact f of relay 01, the contact working e of the OCR relay, wire 61, the working contacts in parallel b and e of the respective OLP and 01L relays, the working contact a of the 01T relay, the winding of this relay and the N terminal.

   The 01T relay is thus kept energized until the OLP relay drops back to open its work contact b, after which the 01T relay drops out to end the ninth long pulse of the code.



   As it has been assumed that the contact a of the WZB control button

  <Desc / Clms Page number 19>

 Ajguille heating is closed, the tenth pulse of the control code will also be long. Relay 02T is kept energized by means of a circuit passing through terminal B, work contact h of relay 234 S, wire 96, contact has now closed of button WZB, wire 40, work contacts f 02 and OCR relays, wire 62, work contacts 2 in parallel with 02L and OLP relays, and finally the already defined holding circuit of 02T relay. When the OLP relay drops during this long pulse to open its work contact c, the 02T relay again loses its excitation. As a result, relay 01T is energized to terminate the tenth pulse of the control coae.



   Since the 1SW needle lever is in its normal position and its reverse contact is therefore open, no current is supplied during the eleventh pulse to keep the 01T relay energized, which is then only controlled by its circuit. impulse. Thus, when the rest contact g of relay 03 opens, relay 01T drops to complete this eleventh pulse. Since the CHB and MCB buttons have not been pressed, so that their contacts a are open, and since the needle lever 3SW is in its reverse or right position, with its left contact open, the pulses 12, 13 and 14 of the code are also short, no current being supplied to keep the 01T and 02T relays energized.



   However, since the right contact of the 3SW needle lever is closed, current is supplied during the fifteenth pulse to keep the 01T relay energized, so as to generate a long pulse of the coae. The corresponding circuit passes through terminal B, the on contact of relay 234S, wire 98, the contact on the needle lever 3SW, wire 45, the on contact f of relay 07, the rest on the circuit indicated previously in about the ninth pulse, and finally winding to relay 01T. When the OLP relay drops, to open its contact b, the 01T relay drops again to terminate the 15th pulse of the code.



   In the current CTC systems generally used, to transmit the other control functions necessary to position the various devices of the station, in order to allow the desired movements of the trains, it would be necessary to transmit a complete additional control code consisting of sixteen pulses, with a separate call sign for each station. Thanks to the present invention, it is on the contrary possible to transmit these additional control functions by adding additional pulses to the primitive code thanks to the use of counting chain extension relays.



   To allow the use of such relays in order to supply the pulses of the code 17 to 23 inclusive, a relay 16 is provided (figure which operates during the sixteenth pulse of the code to prepare circuits in order to initiate the action of the relays The relay 16 thus operates on the sixteenth pulse, in the same way as the relay 08 on the eighth pulse.



   The circuit used to energize relay 16 for the sixteenth pulse passes through terminal B, contact a in the normal position of relay OR, resistor R12, work contact to relay OLBP, wire 90, rest contact a to relay 06, work contact b of relay 07, work contact h of OCR relay, idle contact g of relay 08, wire 87, the winding of relay 16 and terminal N. When relay 16 is energized, it completes a holding circuit passing through its work contact a, the idle contact b to relay 17-21 and wire 90. The sixteenth pulse being analogous to the eighth pulse, which is one of the station selection pulses, can be used to transmit a control function.

   However, in the preferred embodiment of the invention, no control function is entrusted to the pulse 16. The analogy with the code is thus retained.

  <Desc / Clms Page number 20>

 of control in which, for reasons which will be explained a little later; the sixteenth pulse cannot be used to transmit a control function. Since there is no need to make the pulse 16 of a control coil long in this preferred embodiment, this pulse is therefore always short. The 02T relay can thus drop out after the usual time and the 01T relay is then energized to start the seventeenth pulse.



   The necessary circuits are now prepared for relay 17-21 to energize first in the order of the count chain. As explained above, its excitation circuit passes through terminal B, the reverse contact has to relay OR, resistor Rll, contact tr.
 EMI20.1
 vail b from OLBP relay, wire 89, work contact g of OCR relay, rest contact a of relay 07, rest contact b of relay 08, wire 88, work contact b of relay 16, the winding of the relay 17-21 and finally terminal N. As explained above, relays 18-22, 19-23 and 20 follow in sequence, in a manner analogous to the relays of the primary metering chain in the group OLC.



   Since the signal control lever 2SG is in the normal position, with its two left and right contacts open, no current is supplied to pulse 17 to keep relay 01T energized to provide a long pulse. Relay 01T therefore drops out in the usual way when relay 17-21 is energized to cut the pulse circuit at its rest contact g. However, since the signal control lever 4SG is in its left position, a circuit is formed to keep relay 02T energized, so that pulse 18 is long.



  This circuit goes through terminal B, the work contact n of relay 234 S, wire 101, the left contact of signal lever 4 SG, wire 103, the con-
 EMI20.2
 tact tcevaid c, from relay- 18-2-2.f the contact re1) OêV dtirnà.ids;: OeiU "i1: .è wire '92, the working contact f of relay 0aR, wire 62, the working contacts e parallel to the 02L and OLP relays, and finally the 02T relay holding circuit. When the OLP relay drops out and opens its working contact ±., the 02T relay re-opens.
 EMI20.3
 falls again allowing the OIT relay to energize to start the nineteenth pulse at the code.



   Since the aroite contacts of the two signal levers 2 SG and 4 SG are open, no current is supplied during the pulses 19 and 20 to keep the relays 01T and 02T energized and to reset these pulses long. Thus, relay 01T is controlled by its pulse circuit during these pulses. Note that the OCRA relay is also energized during the twentieth pulse, as will be explained in more detail later. Therefore, the circuit, used to keep relay 02T energized during the twentieth pulse, short circuits the contacts of the OCRA relay used in other similar circuits. This circuit starting from wire 105 goes directly from the work contact d of relay 20 to wire 92, then passes through the circuit described previously to keep relay 02T energized if current arrives in wire 105.



   This is necessary, since the OCRA relay is not energized as long as the relay 20 has not itself been energized, and it is essential to establish and maintain the holding circuit at the 02T relay from the moment when relay 20 is energized.
 EMI20.4
 



  As just mentioned, the OCRA oB celais energizes when relay 20 energizes itself during the remainder of the code. The OCRA relay energizer circuit, which includes the contact work ç of relay 20, has been previously described. The energization of the relay OCRA prepares circuits for
 EMI20.5
 allow relay 17-21 to follow relay 20. Relay OCRA transfiérp (also circuits which, starting from levers or pushbuttons ae ,, comnnde, culmin.t, a.fâl 9rr3o-: ¯92, a'unepefiièrb series of contacts cièsie .ridais. a 'extensd.oar; JlI {è. ae.uxièm.e: ... érie- .Clte., C azta .. For example, the> contact c to the OCRA relay transfers

  <Desc / Clms Page number 21>

 in contact with work c. from relay 17-21 to the work contact to from this relay the connection leading to wire 91.



   The last desired control function is transmitted to station 234 by pulse 20. Thus, the additional pulses of the coil cannot be of any use, although the count extension chain is prepared. to repeat its operating cycle and provide these additional pulses. To save coding time, the invention provides a means of terminating the coding action in any control code, as soon as the pulses are no longer of any use.



   In order for the installation to reset to zero during the normal line period, the code can only be stopped on even pulses. Since the final code pulse is not available to transmit a control function, the final pulse of a control code is therefore the first even pulse after all control functions have been transmitted. As will be explained later, the end of a control code is subject to a similar restriction. Thus, in the command code described here, the final pulse is the twenty-second pulse. The twenty-first pulse will therefore always be short, since no control function must be transmitted on this pulse.



   To achieve this goal, circuits are provided to energize the OCS code stop relay at the central station (figure lb), in parallel with the even counting chain relay which corresponds to the last pulse of the code. In reality, the OCS relay becomes the final relay in the counting chain during any coding action, regardless of the length of the code. The station selector relay contacts and adjustable connections are used to select the different final impulses of the different stations, So that the command and control codes transmitted to the same station and transmitted by it can have, if desired , different lengths, it is necessary, at the central station, to distinguish these two coaes, since the relay OCS must be energized to complete the action of coding aans these two codes.

   Thus, for stations where the command and control codes have different numbers of pulses, a separate circuit must be provided for each code in order to energize the OCS relay. Therefore, a repeater relay of the relay master, the OMP relay, must be used to choose between the separate circuits passing through the contacts of the station selector relay, for the control code and the control code of any station. . The OMP relay is energized during the first pulse of any control code through a circuit passing through terminal B, the work contact f of the OM relay, wire 83, the winding of the OMP relay and terminal N. This relay remains sharp during the entire command code, since it repeats the OM relay.



   For the command code considered here, the OCS relay must energize at the same time as the relay 18-22, that is to say on the twenty-second pulse of the code. When the line relay OR goes to its normal position at the start of the twenty-second pulse, a circuit is completed by terminal B, the contact in normal position has the OR relay, resistor R12, the working contact d of the OLBP relay , wire 90, the normally closed contacts has relays 20 and 16 in series, the working contact h of relay 17-21, the working contact e of the OCRA relay, an adjustable connection and the working contact b of the 234S relay, the working contact a of the OMP relay, wire 80, work contact j of the OCR relay, wire 74, the work contact b of the OLB relay, wire 48; the winding of the OCS relay and the N terminal. The OCS relay is therefore energized.

   Although relay 18-22 also energizes in the usual way, this action has no effect on the end of the code.



   When the OCS relay energizes at the start of the twenty-second pulse, terminal B is disconnected from wire 56 by the rest contact g of the OCS relay, which removes the energization of the OM relay, and the pulse circuit and

  <Desc / Clms Page number 22>

 relay 01T excitation is cut by the rest contact e of the OCS relay, before relay 17-21 drops to close its rest contact g. Consequently, the 01T relay remains at rest when the 02T relay drops out, and the OR relay then remains in the normal position. The OM relay also drops out.



  With the OR relay remaining in the normal position, the 02L, OLP, OLB, OLBP and 01L time relays drop in this order. The OCS relay, which is kept energized., After the fall of the relay 17-21, by a holding circuit passing through the wire 90, its own work contact a, the wire 74, the work contact b of the OLB relay and the wire 48, loses its excitement when the OLB relay drops out. The fall of the OLBP relay disconnects from wire 60 the terminal B, thus dropping the OCR, SP, OCRA relays, and actuated selector relays such as the 234S relay. The installation is then ready to receive a new code.

   If any other central station start relay has been energized to store a control code, that code will begin to be transmitted after the drop to relay 01L, which is the last to drop. The twenty-second pulse thus corresponds to the return of the line circuit to its normal closed state and represents, in the case of the transmission of successive codes, a line closing pulse which is notably longer than any other impulse occurring in a coded.



   We will now consider the operation of the station device shown in Figures 2a, 2b, 2c and 2e, when this device receives the control code just described. It is understood that the line relay R at each station and the time relays 1L, 2L, LP and LBP operate in synchronism with the corresponding relays of the central station. The counting relays at each station operate biasing the first eight pulses in synchronism with the central station counting relays, but only the counting relays of the selected station, where the station selector relay S is energized, are actuated during their second. cycle and their extension cycles.



   On the first pulse of the control code, a station receiver SR relay is selectively actuated in response to the fall of the -IL relay caused by the long character of this pulse. The corresponding circuit passes through terminal B, work contact a of relay LEP, rest contact d of relay 1L, wire 163, rest contact b of relay CR, work contact c of relay 1, the upper winding of the SR relay and terminal N. The SR relay energizes and completes a holding circuit passing through terminal B, the work contact has the LBP relay, wire 160, the work contact has the SR relay, resistor R14, l The lower winding of the SR relay, resistor R15 and terminal N. The role of these two resistors will be explained later.



   As seen in Figure 2c, the station coding group contains a series of three selector relays, FIR, G2R and S, which can be connected in an adjustable manner to respond to any of the thirty-five callsigns. call, the connections being arranged, as can be seen in the drawing, so that the relay S responds to the code 234. As will be explained later, the F1R and G2R relays each have a dual role in the coding action. As well as being the first selector relay, the F1R relay is also used later in the coding action as an odd function register relay. Likewise, the group selector relay G2Rest; used later in the coding action as an even function registration relay.

   In other words, these two relays are used, during the following part of the code, to record respectively the character of the odd pulses and of the even pulses. As the description which follows will show, these relays pass from their first role to their second role by selecting the station relay S and by energizing the chain repeater relay CR.



   The circuits of these relays, considered as selector relays,

  <Desc / Clms Page number 23>

 are generally similar to those already described for. selector relays at the central station. The circuits, for the selector relays which respond to even pulses, pass through terminal B, the work contact a of the LBP relay (figure 2a), the rest contact g of the relay 2L, the wire
164, the closed contact of the GR relay, the working contact of the SR relay, the working contacts has relays 2, 4, 6 and 8 respectively terminating in wires 122, 124, 126 and 128.

   As can be seen in the drawing, an adjustable connection terminating at wire 122 provides an excitation circuit for relay F1R on the second pulse, the FIR relay then completing a holding circuit passing through terminal B, its own work contact a, the break contact c of relay S, the break contact g of relay G2R, wire 160 and the work contact a to relay LBP. The circuits for the selector relays responding to odd pulses pass through terminal B, the work contact a of the LBP relay, the open contact of the 1L relay. wire 163, rest contact b of relay CR, work contact b of relay SR, work contacts g of relays 3, 5 and 7 respectively terminating in wires 123, 125 and 127.

   As shown in the drawing, an adjustable connection terminating at wire 123 establishes a circuit passing through the NO contact, 2 of the FIR relay, to energize the G2R relay on the third pulse. The G2R relay holding circuit passes through terminal B, the work contact a of the LBP relay, its own work contact a, the rest contact g of the S relay, and wire 160. The opening of the rest contact g of the G2R relay drops the F1R relay. Likewise, an adjustable connection terminating at the wire 124 establishes a circuit passing through the work contact e of the relay G2R to energize the relay S on the fourth pulse. Relay S completes a holding circuit, which is connected directly to wire 160 by its own work contact a. Energizing relay S also drops relay G2R.



   It should be noted that the various selector relays F1R, G2R and S are actuated directly after the drop of relay 1L or 2L when the device is in the state of reception as explained above; consequently, these relays are activated before the end of the long pulse and thus make it possible to achieve a certain margin for the adjustment variations over time.



   It is of course also understood that the F1R relays at the different stations can be compotes to any of the wires 122 to 126, and the G2R relays to any of the wires 123 to 127, below the one to which the associated FIR relay. As a result, when the call sign is 234, those F1R relays connected to wire 122 respond to the second long pulse, the F1R and G2R relays connected to wire 123 respond to the third long pulse, and the FIR and G2R connected to wire 124 respond to the fourth long pulse, along with relay S to the selected station group. However, the selection will normally only be completed to energize an S relay at only one station.



  .At other stations, the counting relay operation ends with the eighth pulse, and only the R line relay and the time relays continue to operate for the rest of the code.



   It may happen that a fourth long pulse appears during the station selection portion of a control code. This may be due to a momentary line fault, which erases part of the code, or to faulty operation of the coding equipment. Since the F1R and G2R relays can be selected for any code at several stations, as explained previously, a fourth long pulse may result in the selection of the S relay at one or more stations in addition to the station. desired. For example, if pulse 7 of this code was also long due to a fault, relay S could also be energized at stations 237, 247 and 347 and the selection of these stations could be completed.

   These four stations would then receive the transmitted control functions, and an operation

  <Desc / Clms Page number 24>

 defective and unwanted track devices would occur at stations 237, 247 and 347.



   The installation described here overrides this incorrect station selection. . If any station receives a long pulse that does not match its call sign, the SR relay is bypassed and drops out. This opens the circuit leading to the function registration relays and occurs even though the station selection already has. been carried out. For example, in the command code described here, if any of the remaining pulses of the code, before the ninth pulse, are long, so that the IL or 2L relay at station 234 drops out, current is applied to the 'one of the sons 125 to 128 inclusive. Since these wires, at station 234, are connected by adjustable connections to wire 21, current is applied to the left terminal of the lower coil of the SR relay.

   This bypasses the lower winding of this relay and allows the holding circuit described above to no longer act effectively and to let the relay drop. This action is aided by the low level of excitation existing in the lower winding of the SR relay and by the current limiting resistors R14 and R15 which are placed in the holding circuit. The resulting opening of the normally open contacts g and h of this relay cuts off the circuits described in detail a little later and ending in the function recording relays via the m and n contacts of the CR relay and the normally open contacts of the various relays. chain.



   Thus, no operation registration can occur as a result of the incorrect selection of a station by a fourth long pulse occurring during the selecting portion of a control code.



  In reality, all stations, except the station correctly selected by the three long selection pulses in any code correct at command, are prevented by the forced fall of the SR relay from incorrectly registering a command function during the command. first long pulse not adapting to the form of the call sign of the particular station considered. In the example described above, whether the seventh pulse is long or short, the SR relays, at stations 237, 247 and 347, are forced to drop off before pulse 7.



  This action occurs on pulse 4 at station 237, pulse 3 at station 247, and pulse 2 at station 347. However, this drop of the SR relay, at all unselected stations and for a normal command code, has no effect on the operation and can be neglected. As will be shown later, this action at a station is different from the action at the central station, during reception of a control code; when only a fourth long station selection pulse can cause the control code to be rejected and force the installation to return to zero.



   At the selected station, relay S prepares an excitation circuit, which is completed on the eighth pulse for a chain repeat relay CR. This circuit passes through terminal B, the working contact h of relay S, wire 146, working contact f of relay 8, the winding of relay CR and terminal N. When relay CR is energized, the closing of its work contact a completes a holding circuit passing through terminal B, resistor R10 and wire 160. Closing contact g of relay CR also completes a connection passing through wire 157, the rest contact a of relay 7 and the working contact b of relay 8, to cause operation of relay 1 immediately after that of relay 8.

   Thus, the relays of the LC group counting chain are ready to be used again, as already explained, to supply the pulses 9 to 15. In addition, the energization of the relay CR, by closing its contact. work h, complete a connection passing through the rest contact g of relay 8, to energize extension relay A, in the extension group required for this station, on the sixteenth pulse of a code, This action will be described more completely a little further.

  <Desc / Clms Page number 25>

 



   The working contact of relay CR, while it is closed, shuts a resistor R6 of the holding circuit of relay 8. Resistor R6 is interposed in this circuit to reduce the excitation of relay 8 at the stations where relay CR is not excited. Since this relay is energized only when the station selector relay S itself is energized, relay 8 will drop out more quickly, due to this reduction in excitation, at all stations except station. selected.

   If there was no resistor R6, it could happen in certain cases, when the ninth pulse to the code is also short, that relay 8 is kept energized during the ninth impulse and that it is energized again. by its work contact a, when relay 1 drops off at the start of the tenth pulse and closes its idle contact b, an eighth long pulse would result at this particular station. As explained previously, it can happen that the F1R and G2R relays at a station are energized without the S relay being energized, if the two F1R and G2R relays are connected to the wires representing long code pulses.

   If the energized relay 8 produces a false long pulse, a station selection may result; in other words, the relay S can be energized on the tenth pulse of the code. For example, station 238 may be selected at the same time as station 234. The count chains at station 238 would then continue to follow the coding action, but two pulses back from the code. However, thanks to the resistor R6, the excitation of relay 8 can be maintained at such a low level that the drop of this relay during a ninth short pulse is achieved with certainty at stations where the relay CR is not. not excited.



    Pulses 9-15, 17-23, and other control code-like pulses are used to control a group of functional control relays, which are mostly of the so-called "polarized" or magnetically held type! , according to the position of the corre- sponding levers of the central station. The operation of these magnetic holding relays, quana they are excited by a positive potential at one or the other of their terminals, is analogous to that already described for the OR relay, and will not be described. not therefore. Figures 2d and 2e show a typical arrangement of such relays, comprising needle control relays WS and signal control relays LHS and RHS.

   These relays can be used to control the turnouts and associated groups of signals shown on the track plan at the top of Figure 2d. One of the function control relays shown, the MCS call hold relay, is not of the magnetic hold type, but may be an ordinary neutral type relay with hold circuits. The control of these relays by the coding device will be explained a little later.



   It is understood that the circuits, by which the function control relays control the hands and the signals, do not form part of the present invention. These circuits can be similar to those described with reference to Figures 8 and 9 of US Pat. No. 2,229,249 cited above. For reasons of simplicity, the commands are indicated here by dotted lines, between the command relay and the controlled device. It can be seen that the circuits, between the different track devices and the corresponding control relays, are also indicated by dotted lines.



   Magnetically held relays switch to normal or reverse position, that is to say, are energized or drop out, under the action of pulses provided by the LC group and wires 149 to 155 inclusive, and of pulses supplied by the extension group and by wires 217 to 223 inclusive. The arrival of current in these wires, at the time of the appropriate pulse of the code, is controlled by the various chain relays and their make contacts. The arrival of current at the work contacts of the

  <Desc / Clms Page number 26>

 ch & fne relay is connected by the CR relay and by its working contacts m and n. This limits the pulses supplied to the function control relays to pulses 9 to 15 and subsequent pulses to the coae.

   On the other hand, as has already been mentioned, the current supply is interrupted by the opening of the work contacts of the SR relay, if the station in question has been incorrectly selected as a result of a fault in the line circuit.



   The appropriate circuits for actuating the holding device function control relays, according to the long or short character of the pulses 9 to 15, 17 to 23 and other corresponding groups, are realized by the operation of the two F1R recording relays. and G2R. These relays pass from their primitive role consisting of selecting a station, to this second recording role, under the action of the operation of the relay CR closing its work contacts b and d. The closing of the working contacts ±. and d of relay S also changes the holding circuits of these relays and passes them from the station selection circuits to the recording circuits.



   If relay 1L drops off on any odd pulse of the coded groups mentioned above, a circuit closes via terminal B, the working contact a of the LBP relay, the closed contact ci of the 1L relay, wire 163, the working contact b of relay CR, wire 129, the upper winding of relay F1R and terminal N. When relay F1R is energized, it is kept energized, for the duration of the first following even pulse, by a staked holding circuit via terminal B, the normal position contact a to relay R, working contact e of relay LBP, wire 180, working contact c of relay S, working contact a and the lower winding of relay F1R, and finally terminal N. Relay F1R drops out when normal contact a of relay R opens, at the start of the next odd pulse.



   Likewise, if relay 2L drops off on any of the even pulses of the coded groups mentioned above, relay G2R is energized by means of the circuit comprising terminal B, the work contact has of the LBP relay, the rest contact ± from relay 2L, wire 164, work contact d to relay CR, wire 130, the upper winding of relay G2R and terminal N.

   When the G2R relay is energized, it is kept energized for the duration of the next odd-numbered pulse, during which the R relay is in the reverse position; its holding circuit comprises terminal B, the contact in reverse position a to relay R, wire 171, rest contact e of relay GS, wire 172, work contact b of relay LBP, wire 181, work contact d of relay S, work contact a and the lower winding of relay G2R, and finally terminal N. Relay G2R drops out when reverse contact a to relay R is open, at the start of the first following even pulse.



   The circuits, which the contacts of the F1R and G2R relays realize for the control of the holding relays, are of several types, one of which is represented by the circuits of the 1WS magnetic holding relay, which is controlled in accordance with the position of the lever needle 1SW of Figure la. When this lever is in the normal position, as assumed in the present case, the ninth pulse of the control code is long and the eleventh pulse is short. When this 1SW lever is in the reverse position, the ninth pulse is short and the eleventh pulse is long. When the 1SW lever is in the normal position, the F1R relay energizes on the ninth long pulse, since the 1L relay drops out.

   Then, when the relay R goes to the normal position to start the tenth pulse, its contact a connects terminal B to the holding circuit of relay F1R to keep the latter energized; it also connects terminal B to the work contact b of relay F1R via the same circuit to temporarily complete a circuit passing through wire 184, work contacts g and m of the relays

  <Desc / Clms Page number 27>

 respective SR and CR, the working contact e to relay 1, wire 149, the upper coil of relay 1WS, the working contact a of a locking relay LR and terminal N. The direction of the current in this circuit is directed from left to right in the upper winding of the 1WS relay, so that the contacts of this relay go to their left position, that is, normal.

   Relay 1WS is thus energized in the normal direction, in parallel with relay 2, by an impulse which ends with the drop of relay 1. Relay F1R is not actuated on the eleventh impulse, but relay 1L. stay excited. Thus, although wire 184 is momentarily connected, at the start of the twelfth pulse, to work contacts g and m of relays SR and CR, to work contact 1 of relay 3, to wire 151, to the lower winding ' from lWS relay, to work contact to relay
LR and at terminal N, relay 1WS is not energized because, with relay F1R in the rest position, wire 184 is disconnected from terminal B.



   Likewise, if the 1SW lever goes to the reverse position, so that the ninth pulse is short, the F1R relay at rest and the 1WS relay is not actuated on the tenth pulse. When the eleventh long pulse is reached, the F1R relay then energizes, so that the 1WS relay receives a pulse through its lower winding and from right to left; this pulse causes it to go into the reverse position during the twelfth pulse of the code.



   Another type of control circuit is represented by the WZS relay circuit, which is controlled by the WZB pushbutton on the central station, so as to switch to the normal or reverse position depending on whether a single pulse is short or long. code. If the tenth pulse is short, so that relay 2L remains energized, relay G2R is in the off position when relay R is actuated to the right to start the eleventh pulse.

   A circuit then closes momentarily via terminal B, reverse contact a of relay R, wire 171, rest contact e of relay CS, wire 172, work contact b of relay LBP, wire 181, work contact d of relay S, the rest contact b of relay G2R, wire 229, the winding of relay WZS, wire 150, work contact e of relay 2, work contacts n and h of relays CR and SR, wire 185, the rest contact c of relay G2R, and terminal N. It can be seen that the direction of the current through the winding of the WZS relay is such that this relay switches to the normal position or is maintained in this position. If the tenth pulse is long, as assumed during the command code, relay G2R is energized and held in this state by relay R for the duration of the eleventh pulse.

   Its contacts b and e then reverse the direction of the current through the WZS relay, so that the latter switches to the reverse position. The circuit for controlling relay CHS on pulse 12 is controlled in an analogous manner by relay G2R.



   Two types of circuits have been described above for controlling magnetic holding relays. In the first type, shown by the 1WS relay circuit, the magnetic holding relay is energized only if a corresponding F1R or G2R registration relay is energized in response to a long pulse and does not respond if the pulse is short.



  In the second type, illustrated by the circuit of the WZS relay, the magnetic holding relay is energized in only one direction, if the corresponding pulse is long, and in the opposite direction if this pulse is short. A third type of circuit (not shown) is also available and can be achieved by connecting any one of the magnetically held relays to wire 225 or 228 respectively terminating at the normally closed contact a of the F1R or G2R relay, instead of connecting it to the wire 226 or 229.

   If we assume that one terminal of the WZS relay is connected to wire 228, instead of being connected to wire 229 for example, its other terminal being connected to wire 185 by the circuit described previously, we see that the WZS relay

  <Desc / Clms Page number 28>

 is momentarily energized by relay R only if the corresponding pulse is short., so that relay G2R remains at rest. he
 EMI28.1
 As a result, any of the magnetic holding relays can be arranged to respond to a short pulse and not to respond when the pulse is long.



   A fourth type of circuit for controlling the magnetic holding relays is represented by the circuit associated with the MCS relay of FIG. 2d. MCS relay is a two-winding neutral relay; its upper winding has a smaller resistance than its lower winding so that when they are both excited from the same source, a stronger current flows through the upper winding relative to the lower winding. The position of the MCS relay is controlled
 EMI28.2
 by the MCB pushbutton of the central station (figure 1¯d), the station circuits being arranged in such a way that the relay is energized when the code pulse 14 is long, in which case the G2R relay energizes.

   At the start of the fifteenth pulse of the code, the MCS relay energizes through its upper winding by means of the circuit passing through terminal B, the reverse contact has of the relay R, the wire 171, the rest contact e of the relay
 EMI28.3
 OS9 wire 172, work contact b of relay LBP, wire 181., work contact of relay Ss work contact b of relay G2R, wire 155, work contacts h and n of respective relays SR and CR, work contact
 EMI28.4
 e of relay 6, wire 154s the upper winding of the MCS relay, its own neutral contact. ± .11 wire 230, the working contact of relay G2R and terminal N.

   When the MCS relay energizes, the connection to terminal N is maintained by its continuity contact b, until the new connection.
 EMI28.5
 connection to the NQ terminal via the working contact cl of the G2R relay, is completed by wire 229 and the working contact b of the MCS relay. The closing of the work contact a of this relay completes a direct holding circuit passing through terminal B, the lower winding of this relay and
 EMI28.6
 terminal N. The MC inrush signal, produced here by a lamp, is energized by the working contact c of the relay.



   When it is desired to drop the MCS relay, a fourteenth short pulse is transmitted from the central station, so that the G2R relay is not energized during this pulse. At the start of the fifteenth pulse, a circuit is formed by terminal B, the reverse contact a of relay R, the circuit described previously and contact b of relay G2R, but since this relay is in the rest position, the circuit passes by the rest contact b of the relay, wire 229, the work contact b of the
 EMI28.7
 lais MCS. \! the upper winding of the relay in the opposite direction to that of the current flowing through the lower winding from the holding circuit.!) and then in reverse order by the circuit described previously
 EMI28.8
 and comprising the wire 185 finally by the rest contact ç of the relay G2R and the terminal N.

   The energization of the relay by the current flowing in the upper or control winding overrides the current flowing in the lower or holding winding and the relay is forced to de-energize. After opening of the working contact b, the operating circuit is cut off since the working contact d of the G2R relay is open to disconnect the N terminal of wire 230, so that the MCS relay does not energize again when the maintenance is also interrupted.

   When a relay such as MCS is under the action of an odd code pulse the control circuits pass through wires 226 and 227 and through
 EMI28.9
 contacts b..2 and à of the Folio relay
Since the control code transmitted from the central station to this station 234 is twenty-two pulses in length, it is evident that additional pulses must be included in the encoding action at this station to match the length of the transmitted code. This is done in a manner analogous to that used for the action of the central station coding group; in other words we add extension relays

  <Desc / Clms Page number 29>

 to the counting chain to provide these additional pulses.

   Pulses to the code are added in groups of eight, although only a portion of these available pulses can be used under some conditions. For each possible group of eight pulses added to the code, six additional relays are required. Only five of these relays are added to the count chain, with the sixth relay being a chain repeat relay. To achieve eight pulses, part of the extension count chain is used twice through its coding action cycle. In other words, the three relays 1A, 2A and 3A are used twice, so that with the two remaining relays in the count chain, eight pulses are added per extension group.

   The chain repeater relay; i.e. the CRA relay, is used at the end of the first cycle of the extension chain, in conjunction with the 4A relay, in a manner analogous to that in which the CR relay is used with the relay 8 in the LC group.



   In accordance with the invention, these six relays are included in a group called an "extension group", an example of which is shown in FIG. 2c. All extension groups are identical, with the appropriate wires connected to the terminals in order to make the desired connections to expand the code or terminate it on a chosen even pulse. As mentioned, each extension group of a station adds eight pulses to the coding action of the regular LC group, whether it is the control code or the control code. During a control code, only seven pulses are available to perform the control functions.

   For this reason, as already indicated in connection with the coding action of the central station, preferably only the first seven pulses are used to perform the control functions.



   The relay A of the extension group is energized on the sixteenth pulse of the code, in the same way as the relay 8 of the group LC, but the first relay A checks that the relays 7 and CR are energized and that the relay 8 is at rest. Since the CR relay energizes after the station selector relay S has energized itself, the station must have been chosen for the relay A to energize. When the relay R goes to the normal position at the start of the sixteenth pulse, so that the wire 158 receives current, the circuit extends, to energize the relay A, by the closed contact a of the relay 6, the working contact b of relay 7, work contact h of relay CR, rest contact g of relay 8, wire 204, the winding of relay A and terminal N.

   Closing of the work contact a of relay A establishes a holding circuit in the usual way by the open contact b of relay lA and wires 205, 158. The opening of the open contact b of relay A cuts the holding circuit of the relay. 7, which therefore falls. As a result, of course, the excitation circuit of relay A is cut, as has already been explained, but this relay is however kept energized by its holding circuit, like all the relays in the chain. The holding circuit of relay A opens during the next pulse, when the rest contact b of relay lA is open.



   The relays in the extension group now follow the code, in accordance with the operation of relay R, as already explained, relay 4A being activated on the twentieth pulse of the code. During this pulse, if the operation was correct, the CRA relay is also energized, with the current flowing through wire 160, the work contact c of relay 4A, the winding of the CRA relay and terminal N. CRA relay establishes a holding circuit by its own work contact a and by wire 160; this relay then remains energized during the remainder of the coding action. Driving the CRA relay also prepares circuits to re-energize the 1A relay immediately after the 4A relay.

   The relays 4A and CRA thus operate in a manner analogous to that of the relays 8 and CR in the LC group at the end of the first cycle of the LC group counting chain.

  <Desc / Clms Page number 30>

 



   Relays 1A to 3A then repeat their operating cycle in this order. It is obvious that the code can be further extended by adding another extension group, relay A of group N 2 energizing on the twenty-fourth pulse. The circuit of this relay would check, in group N 1, that the 3A relay is energized, that the 4A relay is at rest and that the CRA relay is energized, to be sure that the twenty-fourth pulse is indeed the appropriate pulse. to energize this relay.



   The control of the relays ae function polarized, which are assigned to the pulses 17 to 23, is analogous to that already explained for the relays assigned to the pulses 9 to 15. During the pulses 17 to 20; circuits are completed successively by the work contacts of the relays 1A to 4A and by the respective wires 217 to 220, to supply current to the function relays controlled during the corresponding pulses. The current is supplied to these circuits alternately by the contacts of the F1R and G2R relays and by the wires 186 and 187 .. Depending on the type of control used, the circuits of these function relays are completed, as has already been explained, by wires 225 to 230 and by other contacts of relays F1R and G2R.

   Note that the current supplying wires 186 and 187 is cut if the CR and SR relays are not energized. During pulses 21 to 23, current from wires 186 and 187 is diverted through CRA relay contacts to circuits supplemented by other work contacts of relays 1A to 3A and wires 221 to 223. Since in the preferred embodiment of the invention, the pulses 16 and 24 are not used for transmitting control functions, the contacts of the relays A, which are required at the station for code extension, are not used for controlling the arrival of current in any of the polarized function control relays.



   For example, the 2LHS and 2RHS relays are controlled by the F1R relay in the same way as the WZS relay, i.e. each by a momentary pulse produced at the start of the code pulse immediately following the pulse of the code. code that is assigned to it, in other words at the start of the pulse immediately following the pulse whose character controls the operation of each of these relays. We will assume that the seventeenth. pulse of a control code, pulse assigned to control the 2LHS relay, is long; the F1R relay is therefore energized.

   At the start of the eighteenth pulse, a circuit is formed through terminal B, normal contact a of relay R, working contact e of relay LBP, wire 180, contact c of relay S, working contact b of relay F1R, wire 184, work contacts g and m of relays SR and CR, wire 187, rest contact h of relay CRA, work contact e of relay lA, wire 217, the upper winding of relay 2LHS from right to left, wire 226, work contact c of relay F1R and terminal N. Relay 2LHS therefore goes to its reverse position. If the seventeenth pulse is short, so that the F1R relay remains at rest, its contacts b and c reverse the direction of the current flowing through the upper winding of the 2LHS relay and the latter remains in the normal position or goes into this position .

   The circuits of the 2RHS relay, controlled by the character of the nineteenth pulse, also appear in the drawing. It should be noted that the 2LHS and 2RHS relays also include, through their lower windings, a local recovery circuit which operates, in a manner which will be described a little later, to energize these relays in the normal direction in response. when the 1TR channel relay drops.



   The 4LHS relay is controlled in a similar way by the G2R relay and by the circuit comprising the wire 184, the working contacts h and n of the SR and CR relays, the wire 186, the rest contact 1 of the CRA relay, the working contact 2 of relay 2A and wire 229. Since it was assumed, during the discussion of the transmission of the control code, that the signal control lever 4GS was in its left position, and therefore the pulse 18 was long, the 4LHS relay switches to the reverse position.

  <Desc / Clms Page number 31>

 



   The 4LHS relay is also controlled by the G2R relay passing through wire 186 and a work contact f of the 4A relay. It should be noted however that in this circuit, it is the working contact j of the CRA relay which supplies current to the working contact of the 4A relay. This is necessary, since the current pulse intended to actuate the 4RHS relay is received during the twenty-first pulse of the code, when the CRA relay has already been energized and is kept energized as it is. explained previously.



   Since the central station coding group ends its action and returns to zero on the twenty-second code pulse, the station coding group must do the same. When the twenty-second command code pulse is reached, the R line relays remain energized and the various L timing relays at each station drop in synchrony with the corresponding relays at the central station. At the selected station, as can be seen in figure 2, the fall of the LBP relay causes that of the CR, CRA, SR and S relays, and of an energized relay, whatever it may be, by- mi the relays of the counting chain. In this case, this relay would be relay 2A. The drop of relay S places the device in the desired state to receive a new code.

   The IL relay is the last to drop out of all relays, and its drop places the device in the state required to initiate transmission of a control code, assuming the relay
SS described below is not excited.



   This completes the transmission of a control code from the central station and the reception of this same code at the selected station.



  As explained, the wishes of the central station operator have been fully met. The function control polarized relays were actuated, in response to receipt of the control code, to change the 3W needle to the reverse position and the 4L signal to the open position, in order to allow the moving train to move forward. west to move through the interlocking on the route desired by the operator. On the other hand, signal 2R is closed, so as to stop the train moving eastward and approaching on track 2AT.

   Although the operation of the polarized control relay allowed the 4L signal to go into the open position, it is understood that the state of this signal is also actually controlled by the conditions of the track, including occupancy. or the non-occupation of the track ahead and along the route established for the train, as well as the operation and locking in the reverse position of the switch on which the train is to pass. Local checks are also performed through different circuits to ensure that the opposite signals are in the closed position, i.e. the 4R signal is closed while the 4L signal is open and the signal 2RA is also closed since the 1W needle remains in the normal position.

   Different other circuits and different checks are also used to fully ensure that all the safety conditions have been met on the route determined by the position of the signals.



   The station encoding device of Figure 2 can also transmit control codes that the central station device is capable of receiving. Each control code consists of an even number of pulses, the first of which is relatively short. The pulses 2 to 8 are arranged in different combinations of three long pulses and four short pulses to actuate different selection relays F, G and S, at the central station and at the station, in accordance with the various codes already described. Pulses 9 to 15 are used to transmit from the station seven control functions.

   One of the aims of the invention is to allow the station coding group to extend the action of its count chain, in the same way as the central station coding group, to provide additional pulses. and transmit all controls from a station and during a single code.



  So the sixteenth, twenty-fourth and thirty-second impulses, and

  <Desc / Clms Page number 32>

 other similar pulses of the code, are used to extend the coding action, by preparing circuits allowing the use of chains (the extension counting, which provide the pulses 17 to 23,25 to 31 and others similar groups for transmitting control indications to the central station Extension pulses are not available during a control code to transmit a function, since these pulses must necessarily be long pulses in a control code.



   Pulses 9 to 15, 17 to 23, 25 to 31, and pulses of other similar groups, however, can be made long or short to indicate the status of mobile devices in the station. The character of these pulses is initially recorded at the central station by a group of intermediate recording relays 1R to 7R, which are used again during each extension cycle of the count chain. The recorded characters of the different groups of pulses are transferred to the corresponding groups of the K control relays, on the selected panel of the central station, during the sixteenth, twenty-fourth and other extension pulses.



   As indicated above, the invention also proposes to allow the selection of the next even pulse, as the final pulse of the control code, following the actual number of pulses necessary to transmit all the desired control indications. . Thus, adjustable connections and circuits are provided, as will be seen later, to enable the coding action of the station and that of the central station to be terminated on this selected pulse.



   A typical group of station devices has been shown in Figures 2d and 2e; these devices consist of a group of control relays comprising the TKSR track storage relays, the AR approach relays, the NWP and RWP switch point relays in normal and reverse position, and the LHR and RHR signal control. The control of these relays by the conditions of the track and by the positions of the track devices can be achieved by any well known means. For simplicity, these commands have been represented by dotted lines since they do not form part of the invention.

   The needle position repeater relays are shown as being energized by circuits supplemented by movable connectors, which are themselves controlled directly by the position of the needle tips.



   The station device is arranged to automatically initiate a control code in response to a change in position of any of the control relays. Each control code is stored for transmission, when the line circuit becomes available, by dropping to a station start relay ST shown in Figure 2c. This ST relay is normally kept energized by a holding circuit passing through terminal B, the rest contact e of relay S, wire 182, the rest contact c of relay LB, wire 183, its own contact in normal position a and the winding to relay ST, wire 216, a contact b work or rest of each of the different control relays ae control of figure 2d, wire 224, a work or rest contact b of each of the different control relays ae control of figure 2e and terminal N.

   To ensure that the starting relay drops, during the brief period when the circuit is open during switching to contact b alum relay ae control from one position to another position; without needing to adjust this contact, a sensitive relay of the polarized type is used as a starting relay. In addition, an inductive reactance 190 is connected across the winding to the relay. The current stored in the coil of the reactance 190, when the relay ST is energized, provides a source of an inauit contact to quickly switch the relay ST to its reverse position, in order to open its circuit.

  <Desc / Clms Page number 33>

 holding, in response to any sudden increase in circuit resistance due to the displacement of one of the contacts b of the control relays.

   This action occurs even if such a control relay contact only opens for almost no time. Thus, no adjustment of these contacts is necessary.



  * During any coding action from the line circuit, the energization of the LB relay keeps the relay holding circuit
ST passing through the battery and the working contact of the LB relay. Since contact c of relay LB is a continuity type contact, the holding circuit is continuously maintained while the relay is energized or at rest. If the particular station 234 has not been selected by the code, relay LB eventually drops to re-establish the maintenance circuit defined in the previous paragraph. If station 234 has been selected by a command code so that relays S and SR have been energized, relay LB also remains energized until the final impulse of the coding action.

   As explained previously, in connection with the reception of a control code, the LB relay drops out first, that is, before the S and SR relays. The holding circuit of relay ST then passes through the left terminal of its winding, its own work contact a, wire 183, the rest contact e of relay LB, wire 182, the work contact e of relay S, wire 236, the working contact c of the SR relay and terminal 241. Since no current is supplied to this holding circuit at this time, a control code is automatically stored at the station after reception of a code any command, since relay ST is at rest.

   If you do not want an automatic callback, that is to say if you do not want to automatically transmit a control code after receiving a control code at a station, connect terminal 241 to the normal contact a of relay R by a wire such as wire 159 connected to the rest contact c of relay SR. As already indicated, relay R is in the normal position during the last pulse of the control code and relay ST is held until relay S drops out to re-establish the primitive hold circuit. Since contact e of relay S is also a continuity contact, the current supplying relay ST in this case is not cut. If the SR relay were to drop before the S relay, wire 159 would hold the ST relay hold circuit until the S relay dropped.

   The connection passing through wire 159 and the normal contact a of relay R is also used, as will be explained later, during the normal reset of the station LC group, at the end of a control code. A control code, can also be started, as om leoverra below, by transmitting a call code from the central station, 'this code allowing the ST relay to drop after the opening of the work contact c of the LB relay.



   The transmission of a control code by the device shown in FIG. 2 will now be described. It is assumed that this control code is initiated by the movement beyond the signal 4L of the train already mentioned and moving towards the west; having passed this open 4L signal, this train enters the 3T track section and the 3TR track relay, which is bypassed, drops to idle. It is also assumed that this westward train still occupies the section of track 4AT at the time of transmission of the control code. The positions of the other devices have been established by the order code described above.



   The opening of the make contact a of the 3TR track relay opens the normally closed holding circuit of the 3TKSR track storage relay, circuit passing through terminal B and the make contact a to the 3TKSR relay, and it also opens the d circuit. excitation passing through terminal B and work contact b of an MSTP relay. The 3TKSR relay drops out and its contact b opens the ST relay holding circuit, which drops out by

  <Desc / Clms Page number 34>

 therefore it is the rider already described. The fall to the ST relay opens its normal contact il and thus cuts the excitation circuit of the MSTP relay, which is a repeater relay to the start relay ST and also to the master relay M.

   The excitation circuit at the MSTP relay passes through terminal B, the open contact f au. relay M, wire 177, normal contact c to relay ST, wire 238, the winding of the MSTP relay and terminal N. It is thus seen that the MSTP relay cannot be energized again, once it has dropped, as long as relay M has not dropped, during the final pulse to the control code. As a result, the 3TKSR relay cannot energize again before the final pulse of the control code either. In other words. 9 the 3TKSR relay remains idle until the channel busy indication has been transmitted to the central station. This is necessary to be sure that the track occupancy indication is transmitted, since track sections such as 3T are very short.

   Thus, if the line circuit is not immediately available to transmit the control code, the train can be pulled out of the 3T track section and the 3TR relay can be energized before the control code has been sent.



  However, as explained, the 3TKSR track storage relay stores the control indication until such time as it can be transmitted to the central station. At the station shown, the 1TKSR relay remains energized via the work contacts of the channel relay associated with it.



   If the line circuit is available, a starting circuit is closed passing through terminal B, the reverse contact b of the ST relay, the rest contact b of the SS relay, wire 147, the working contact b of an RP relay , the closed contact a of a thermal cut-off relay COR, the closed contacts b of the respective relays 1L and 2L, the winding of relay M and terminal N. The relay M is energized, completing a temporary holding circuit , which passes through its own work contact, wire 166, the idle contact! of relay SR, wire 167, the rest contacts e and c of the respective relays LB and LBP, in parallel with the rest contacts b of relays -IL and 2L. Relay M contacts b and 51 reverse the connection of relay R to line wires Y and Z.

   The make contact d of relay M also closes a low impedance bypass passing through the rest contact f of the LBP relay from line Y and terminating at line Z. The make contacts b and c of relay M directly connect the capacitors of the relay. LPF low-pass filter on the lines, so that these connections correspond during transmission to those of the corresponding low-pass filter at the central station. Normally, the impedance presented on the lines by the station apparatus is significantly increased, as desired, by inserting a high resistance in series with the first capacitor and disconnecting the other capacitor from the line circuit.



   The excitation of relay M also completes the excitation circuit of relay 1T. This circuit passes through terminal B, the reverse contact b of the ST relay, the rest contact b of the SS relay, wire 147, the working contact b of the RP relay, the closed contact a to the COR relay, the closed contact c of the relay LBP, the rest contact f of the LB relay, the work contact e of the M relay, the rest contact b of the 2T relay, the winding of the 1T relay and the terminal N. The energization of the 1T relay starts the first pulse of the code. Closing the work contact c of relay 1T also closes the excitation circuit of relay 2T, which is also energized.



   When the line circuit is bypassed by relay M, the associated line relay R drops out. The increase in the current supplied by the battery 77 to the central station also allows the transformer RT, represented in FIG. 1a, to supply a pulse to switch the relay OR to the reverse position, substantially in synchronism with the relay R. ci activates the associated time relays and relay 1. Closing the working contact e of relay LB transfers the temporary holding circuit of relay M and passes it through terminal B, the working contact d of the relay

  <Desc / Clms Page number 35>

 
1T, wire 178, the contact rest there. relay S and wire 179.



   At the central station, the OR relay activates the OL time relays, relay 01 and relay E, as on the first pulse of a command code. In addition, a circuit is formed by terminal B, the reverse contact a of the OR relay, the rest contact h of the OLBP relay, the rest contact b of the OM relay, wire 65, the rest contact c of the OCS relay, wire 66, the winding of the PC relay, wire 17, the normally closed contact of the cancel button CB shown in figure le, and finally the N terminal.
PC is therefore energized and its contacts b and d reverse the polarity of the current supplied to the line, while its working contact e completes a circuit energizing a slow-drop PCP repeater relay.



   The abrupt variation of the line current, variation due to the operation of the PC relay which has changed the polarity of this current, has no effect on the OR relay, for two reasons. The first reason is that, when the PC relay energizes, the secondary of the transformer RT is momentarily short-circuited by the work contact c of the PC relay and by the idle contact c of the PCP relay. The second reason is that the lower winding of the OR relay is energized in the opposite direction by means of the circuit passing through terminal B, the rest contact b of the PCP relay, the work contact 1 of the PC relay, the rest contacts e of the relays. OM and OT, the lower winding of the OR relay and terminal 0.



   The PC relay remains energized thanks to a holding circuit passing through terminal B, its own work contact a, the work contact h of the OLBP relay, the remaining part of the excitation circuit of this relay, circuit indicated above, the contact normally closed of the CB cancel button and finally the N terminal. The PC relay therefore remains energized until the OCS relay energizes itself on the final code pulse.



   The shunt established as a bypass on the line wires y and Z by the relay M of the transmission station also short-circuits and consequently causes the line relays R to fall to the stations more distant from the central station. If the transmitting station is at a considerable distance from the central station, it is possible that the voltage between the line wires, voltage which varies between a maximum almost equal to the voltage of the battery 77 of the central station and about zero at the place where the shunt is applied, remains sufficient to keep the relays R energized at the stations close to the central station. However, these relays are returned to the rest position by the line polarity reversal carried out by the PC relay.

   As a result, all the line relays R drop more or less simultaneously when any relay M energizes to start a code, each relay R activating its timing relays L and the first counting relay 1. At each station where the relay M is not actuated, relay R remains at rest, keeping relay 2L energized but allowing relay IL to drop to energize relay SR; then the LP, LB, LBP, 1 and SR relays drop in that order.



   At the transmitting station, closing the work contact f of relay LB completes the pulse circuit of relay 1T; this circuit passes through terminal B, the rest contact b of relay CS; wire 199, the contacts rest there. relays 3A and 1A, wire 196, the rest contacts g of relays 7, 5, 3 and 1, wire 168, the working contact! of relay LB, the contact. !! of relay M, and then, to energize relay 1T, by the rest contact b of relay 2T, the winding of relay 1T and terminal N. When the pulse circuit operates as a holding circuit of relay 1T, the contact rest b of the 2T relay is replaced by the work contact b of the 2T relay and the work contact a of the 1T relay in series.

   r
The 1T relay transmits a code by the operation of its contact b.This contact is made effective to transmit the control code, when the LBP relay is energized on the first pulse of the code for

  <Desc / Clms Page number 36>

 open your rest contact! which is in parallel with the work contact 12 of relay 1T. Each time the 1T relay energizes, a low resistance shunt. closes with line Y, work contact b of relay T, work contact at relay M and line Z.

   At the same time, the circuit of the relay R, which passes through the now positive Z wire, the working contact d of the M relay, the closed contact b of the 1T relay, the resistor R3, the winding of the R relay, the working contact 12 relay M and wire Y, is opened by relay 1T at the rest contact b thereof; thus, the prop R falls back more quickly than if it were simply short-circuited by the closing of the working contact b of relay T.



   Although the first pulse of a control code is short compared to the first pulse of a control code, it is depending slightly longer than the other short pulses.



  This first pulse begins when the relay M is energized by closing its work contact d; this closing occurs slightly before the 1T relay is energized; this pulse ends when the 1T relay drops out following the energization of the LB relay, which opens through its rest contact 1 the initial circuit which does not maintain the 1T relay; this happens slightly after relay 1 energized to open the normal relay 1T pulse circuit.



   The response of the transmitting station device, which is necessary to allow transmission to continue, also depends on the conditions at the central station. Since the connections of the R relay to the line have been reversed by the M relay, the R relay only energizes, to start the second pulse, if the PC relay has been energized to reverse the polarity to the line current, by indicating that the central station device is in reception state, with the OM relay at rest;
The control code call pulses are generated by the 1T and 2T relays, in the same way as by the 01T and 02T relays during the command code already described.

   Assuming the call sign is 234, the second pulse is extended by closing a 2T relay hold circuit. This circuit passes through terminal B, the normally closed contact 1 to celais S, the closed contact ± of relay F1R, an adjustable connection, wire 132, work contact c of relay 2, wire 235, the working contact a of the relay 2T, the rest contact c of relay 1T, the winding of relay 2T and terminal N. On the second pulse, relay F1R is energized in response to the drop of relays 2L and LP, the circuits being analogous to those described for the same relay while receiving a command code at that station. However, it will be understood that the work contact d of the SR relay, in the circuit indicated above, is now replaced by the idle contact d of the LP relay.

   Thus, the energization of relay F1R is delayed beyond the analog energization of this relay during the second pulse of the control code. This is necessary to allow adjustment variations over time between this station and the coding group of the central station, since it is the excitation of relay F1R which initiates the action intended to terminate this second pulse of the code. In other words, when relay F1R is energized, its rest contact f cuts off the holding circuit of relay 2T, which consequently drops out. This drop of the 2T relay allows the 1T relay to be energized by its pulse circuit and to terminate the second pulse.



   The third pulse is then extended by the operation of the holding circuit of relay 1T. This circuit passes through terminal B, the rest contact f of relay S, the rest contact f of relay G2R, an adjustable connection, wire 133, the working contact ±. of relay 3, wire 234, work contact a and the winding of relay 1T, and finally terminal N. Relay 1T is then kept energized, until relay G2R is energized in turn to open its rest contact f. The excitation circuit

  <Desc / Clms Page number 37>

 relay G2R is again analogous to the circuit used to energize this relay during the command code.

   Once again the working contact 1 of the
 EMI37.1
 reéais SR is replaced by an idle contact] 2. relay 1-P, so that the excitation of relay G2R is delayed to allow sufficient time for this code pulse. Relay 1T then drops to terminate the third pulse and to control the fourth pulse.



   Like the second pulse, the fourth pulse is extended by the operation of a 2T relay holding circuit. The circuit used to generate this fourth line pulse is similar to that of the second line pulse with this difference, however, that it only includes the rest contact f of relay S, wire 134 and work contact c of relay 4. During the fourth pulse, the selector relay S
 EMI37.2
 station is energized, in response to the drop of relays 2L and 1, P I, ar iin circuit analogous to that of relay Finit. When Tn is energized, relay S completes a holding circuit passing through its own work contact, wire .t0, work contact z, of the LBP relay and terminal B.

   I. opening the idle contact f of relay S allows relay 2T to drop, and the latter allows
 EMI37.3
 keep the IT relay energized to start the fifth pulse.



   When relay S energizes, its contact g transfers the holding circuit of relay M, from the second temporary circuit to terminal B, at the location of the rest contact b, of relay CS, via wire 199. This holding circuit is maintained until the CS relay energizes on the last pulse of the control code to drop the M relay, as will be explained a little later.

   About the second cir-
 EMI37.4
 temporary cooked for maintaining relay M, circuit passing through wire 7'9 and the work contact, of relay 1T, it should be noted that, when the VIT relay has dropped during normal operation of the first impulses of the code da ecntio7 e, the relay R was in its normal position, so Q "13 -: 1'.1 current was supplied to wire 'l719, to keep relay FUI energized: st passing through the normal contact to relay R and the rest contact d of relay 1T. If relay R is not energized for some reason
 EMI37.5
 conch., qrard lp relay 1T drops out. the T'est Fi loses its excitation and falls back X) 1'l '1ntf: rrOI1r> rb the control code.

   This would be appropriate since relay 1T and relay R are not energized, the conditions on the
 EMI37.6
 circju c'f ügne or at the central station would not allow reception of the control code.



     Since the pulse circuit of relay 1T works in the same way as that already described for relay 01T, it is clear that if relay S is actuated on the fourth pulse, pulses 5 to 3 are short pulses generated by the operation of the 1T relay using its normal pulse circuit, in conjunction with the drop of the 2T relay. The relay CR is energized during the eighth pulse through the circuit passing through terminal B, the make contact h of relay S, wire 146, the make contact ± of relay 8, the winding of relay CR and terminal NOT.

   The CR relay is energized by closing, by its own
 EMI37.7
 work contact has its holding circuit, which passes through terminal B, the work contact to the LBP relay, resistor R7.0 and wire 160.



   When the CR relay energizes, it closes an energizing circuit of the ST start relay; this circuit passes through terminal B, the contact
 EMI37.8
 work; L of relay M, wire 232, work contact 2 of relay CR, work contact a. of relay 8, wire 206, the winding of relay ST and resistor 190 in parallel, wire 216, the on or off contacts
 EMI37.9
 , the various control relays shown in Figures 2çj, and 2s wire 224 and terminal N.

   The ST relay then energizes and establishes a cir-
 EMI37.10
 temporary hold which passes through terminal B, work contact g., of relay LB, wire 183, its own contact in normal position a, the relay winding, reactance 190; and which then coincides with the circuit Indicated above to end at terminal N.

  <Desc / Clms Page number 38>

 



   The energization of the relay CR on the eighth pulse establishes circuits to make the next seven pulses available to indicate the state of the switches or mobile devices discussed above. By closing its work contacts e and f, the relay CR establishes the connections passing through terminal B, the various contacts a of the control relays in figure 2d, wires 139 to 145, and completed successively by the work contacts f of the relays 1 to 7 on pulses 9 to 15 of the code, in order to keep the 1T relay or the 2T relay energized, as the case may be, until the LP relay drops. Such a long code pulse can then be considered as a positive indication, since the mobile device is in the active state.

   For example, since the 1W needle is in its normal position commanded by the operator during the command coae, the ninth pulse of the control code must be long to transmit this information to the central station. The 1NWP relay, shown in figure 2d, is energized, the excitation current being supplied by terminal B and passing through the movable connector associated with this needle, which now occupies the position shown in the drawing, by the winding of the relay and. terminal N.

   The circuit intended to keep the 1T relaia energized, in order to make the ninth pulse long, goes through terminal B, the work contact has the 1NWP relay, wire 139, the work contact! of relay 1, work contact e of relay CR, wire 161, work contacts in parallel c of relay LP and e of relay 1L, work contact a and the winding of relay 1T, and finally terminal N. The relay 1T is thus kept energized, until relay LP drops out, generating a ninth long pulse.



   Likewise, the fourteenth pulse is made long by keeping relay 2T energized by the current supplied by terminal B to the rest contact a to relay 4AR (figure 2d), this relay being shunted and brought back to rest by the train that is being assumed to occupy track section 4AT. The 2T relay holding circuit passes through wire 144, the work contacts f of relays 6 and CR, wire 162, the work contacts e in parallel with relays 2L and LP, the work contact has to relay 2T, the rest contact ±. of relay 1T, the winding of relay 2T and terminal N. Relay 2T remains energized until relay LP drops out and opens its working contact, generating a fourteenth long pulse.



   The fifteenth pulse must also be long to indicate that the 3W hand is in the position: 'reverse commanded' by the operator during the command code. The 3RWP relay represented in FIG. 2d is excited by the current supplied by terminal B and passing through the mobile connection associated with this needle, which now occupies the position shown in dotted lines in the drawing, as well as by the winding of this relay to end at terminal N. The 1T relay holding circuit is analogous to that used to keep this same relay energized during the ninth long pulse, with this difference however that the make contact has the 3RWP relay, wire 145 and the contact job ! of relay 7 are in the circuit.

   The pulses 10 and 12 of this check code will be short, since the respective track sections 1T and 2AT are not occupied. However, if the eastbound train approaching interlocking occupied this section of track 2AT before the transmission of the twelfth pulse, the indication of this occupation would be transmitted with this control code. If this indication is transmitted, it is possible, as will be explained in a moment, for a second code to be initiated by this indication.



   To transmit to the central station the control indications supplied by the relays shown in FIG. 2e, it is necessary to extend the coding action beyond its current termination on the sixteenth pulse. This is again achieved, as with the command code, by extending the chain of counting relays. We use, to increase

  <Desc / Clms Page number 39>

 the length of the control code, the same extension group that was used to extend the coding action after receiving a control code. Each extension group adds eight more pulses to the code, seven of which are available for the transmission of control indications.



   The sixteenth and twenty-fourth pulses, as well as the analogous pulses, are not available for code transmission, but are only used to prepare circuits for the extension count strings.



   During code pulse 16, relay A of the extension unit is energized by the same circuit, described previously, as during reception of the command code. This circuit checks that relays 7 and CR are energized and that relay 8 is not; in other words, it checks that it is indeed the appropriate impulse to energize relay A.



   However, the sixteenth pulse of a control code must always be long, due to some necessary relay action at the central station coding group. The current is supplied by terminal B and passes through the work contact c of relay A, wire 198, the work contact f of relay CR, as well as through the previously defined holding circuit of relay 2T. This last relay is kept energized until the LP relay drops. The 2T relay being kept energized, the 1T relay remains at rest to generate a sixteenth long pulse. After the 2T relay drops, the 1T relay energizes to start the seventeenth pulse. As before, relay A prepares a circuit to energize relay 1A during the seventeenth pulse.



   The action of the extension group count chain is the same as before. The CRA relay energizes on the twentieth pulse to reverse the coding action and to use relays 1A, 2A and 3A again. As before, if pulses are needed in addition to the twenty four pulses now available, a second extension group is provided, the relay A of which is energized during the twenty-fourth pulse by the circuit defined above, which comprises the working contact h of relay 3A, the working contact e of the CRA relay, and the rest contact e of the 4A relay.



   Pulses 17 to 23 are available to transmit to the central station the additional indications sent by the station. The current is supplied again by the make contacts a of the various control relays shown in FIG. 2e, the wires 209 to 215 inclusive, and the make contacts of the relays 1A to 4A. The contacts f and g of the CRA relay are used to differentiate the work contacts of the relays lA, to 3A, which are used respectively during the pulses 17 to 19 and 21 to 23. Note that the work contact d of the relay 4A is connected directly to the thread 198.

   This is necessary since the CRA relay energizes during this twentieth pulse, so that its transfer contacts must be short-circuited by the circuit used to keep the 2T relay energized during this pulse, if it is desired that the pulse be long. On the other hand, since the relay 4A is only used for this purpose once during the coding action, it is not necessary to differentiate the two make contacts of this relay.



   When the 4L signal was opened by the dispatcher during the control code, for example, the 2T relay was kept energized, during the next control code immediately, through the circuit passing through the terminal B, the make contact ± of relay 4LHR shown in figure 2e, wire 210, work contact c of relay 2A, rest contact of relay CRA, wire 198, work contact 1 of relay CR, and the previously defined holding circuit of the relay 2T. However, when the train passed the 4L signal which was open, the signal returned to the closed position and the 4LHS relay returned to its normal position.



  The circuit producing this last operation passes through terminal B, the

  <Desc / Clms Page number 40>

 contact c of the 3TKSP relay, the lower series windings of the 4RHS and 4LHS relays in the direction from the left to the right, and finally terminal N. The 4LHS relay consequently loses its excitation. Thus, during the control code which has just been described, the code pulse 18 is short, since no current supplies the holding circuit of relay 2T.



   The only long pulse of the code extension group in the considered control code is the twenty-first pulse, with channel 3T busy. The circuit keeping relay 1T energized during this pulse goes through terminal B, the rest contact a of the 3TKSR relay, wire 213, the work contact d of the relay lA, the work contact f of the CRA relay, wire 197 the work contact e of relay CR, wire 161 and the rest of the previously defined holding circuit of relay 1T. The latter thus remains energized until the LP relay drops out, removing the excitation of the 1T relay. This therefore falls to end the twenty-first impulse.



   As can be seen by considering FIG. 2e, there is no need at this station for pulses 22 and 23, since there are no other control indications to be transmitted to the central station. The code can therefore end after the twenty-first pulse, so as to conserve a coding time on the line circuit. To correctly reset the central station equipment, as well as the equipment of this station and other stations, the code must still end with the R line relays in the normal position. This subjection restricts the final pulse of a control code to only even pulses. Thus, at the station shown in Figure 2, the check code ends on the twenty-second pulse.



   To terminate the control code, the CS code stop relay must be energized on the final pulse in parallel with the particular count chain relay corresponding to that pulse; in other words, the CS relay must become the final relay in the count chain.



  So that the coding groups are identical to all the stations, adjustable connections are provided which pass through the open contacts h of relays 1, 3, 5, 1A and 3A, or through the open contact b of relay 7 if the code must be end on the sixteenth pulse as for energizing the first relay A, in order to energize the CS relay on the desired code pulse. Since the code must end on the twenty-second pulse at this station, the adjustable connections for energizing the CS relay on the final code pulse are made to include the working contact h of the 1A relay.



   When the twenty-second pulse is reached, the relay R of the transmitting station switches to the normal position, energizing the relay CS by means of a circuit passing through the terminal B, the normal contact a of the relay R, the working contact e of the LBP relay, resistor R9, wires 158 and 205, rest contacts, !! relays 4A and A, work contact h of relay lA, work contact d of CRA relay, an adjustable connection, wire 200, work contact h of relay M. wire 188, work contact .1 of relay CR , wire 131, work contact b of relay LB, wire 148, the coil of relay CS and terminal N. When relay CS is energized., it completes a holding circuit passing through wire 148, the work contact b of relay LB, wire 131, its own work contact a and wire 158.



   Relay CS opens its rest contact b to disconnect terminal B from wire 199 and at the same time from wire 178 via the working contact g of relay S. Relay 1T thus remains at rest when relay lA drops to close its rest contact g in the normal pulse circuit of relay 1T. Relay M also drops out by reversing the connections

  <Desc / Clms Page number 41>

 line by its contacts b and d, in order to make relay R sensitive now only to line current of normal polarity.



   At the central station, the OR relay switches to the normal position by energizing the OCS relay. This, by opening its rest contact c, causes the PC relay to drop again, thus re-establishing the normal line polarity, so that the relay R of this station remains energized after the drop of the relay M.



   This relay action at the central station will be described more fully a little later. It suffices to say here that the PC relay drops the PCP relay and the OR relay drops the 02L, OLP, OLB, OLBP and 01L relays in that order.



   The OR relay remains in its normal position and is not affected by the operation of the PC relay because, when this change in line polarity occurs, the secondary of the transformer RT is short-circuited by the closed contact, 2 of the PC relay and by the work contact c of the PCP relay. The OR relay is also kept energized in the normal direction., Until the PCP relay drops out via the circuit passing through terminal 0, the lower winding of the OR relay, in the left direction to the right, the rest contact e of the 01T and OM relays, the rest contact f of the PC relay, the work contact a of the PCP relay and terminal N.



   The reestablishment of the normal line polarity by the PC relay causes the excitation of the R line relays at all the other stations.



  At these stations, relays 1L, LP and LBP energize, while relays 2L, LP, LE, LBP and 1L then drop in that order.



   At the transmitting station, even if the relay M drops out exactly at the instant when the line polarity returns to normal, the relay R may be momentarily deprived of excitation. However, since the relay CS is energized, its working contacts c and d connect together respectively, through the wires 170; 171 and 173, 174, the contacts in normal position and in reverse position a and b of relay R, so that the circuits controlled by this relay remain in the same state as if the relay R remained energized.



   Consequently, the time relays L of this station fall back in order, substantially in synchronism with those of the central station and slightly ahead of those of the other stations. Relay CS is returned to the rest position by opening its work contact maintenance circuit b of relay LB. The CR, CRA and S relays drop when the make contact a of the LBP relay opens to disconnect terminal B from wire 160.



   It can be seen, from the previous description, that all the coding groups are returned to the normal position and placed in the appropriate state of reception before the fall of the relays 01L and IL, to put the system in a state to transmit the code. next.



   The fall of the M relay completes an excitation circuit of the MSTP relay shown in Figure 2e. This relay, which is a repeater of relays M and ST, is energized by a circuit passing through terminal B, the rest contact i of relay M, wire 177, normal contact c of relay ST, wire 238, the winding of the MSTP relay and the N terminal. The MSTP relay energizes and prepares circuits to energize the various TKSR relays, and more especially the 3TKSR relay in this case, when the corresponding TR relay is energized again. The 3TKSR relay excitation circuit passes through terminal B, open contact b of the MSTP relay, open contact a of the 3TR relay, the winding of the 3TKSR relay and the N terminal.

   So when the train comes out of the 3T track section, so that the shunt is removed and the 3TR relay energizes, the 3TKSR relay can also energize. This naturally causes the ST relay to drop again by starting a new code. If the 3TR relay is already energized when the transmission

  <Desc / Clms Page number 42>

 of the control code is finished and if the MSTP relay energizes, the 3TKSR relay energizes immediately. Since the resulting fall of the ST relay also causes the fall of the MSTP relay, a capacitor C is added in parallel with the winding of the 3TKSR relay, to achieve a sufficient energy reserve and able to complete the excitation of this relay in these cases. conditions.

   When the 3TKSR relay is energized, it completes a holding circuit passing through terminal B, its own work contact a, the work contact a to relay 3TR, the winding of relay 3TKSR and terminal N. The use of these relays d lane indication storage, such as the 3TKSR relay, provides transmission to the central station of lane occupancy indications for these short sections for the purpose of recording such occupancy at the central station by means of writing magnets commonly provided in installations of this type.



   Each of the individual TKSR relays also controls a circuit to return the magnetically held signal control relays to the normal position when a train enters a section of track and drops the corresponding TR relay. This prevents the signals from automatically returning to the open position when a train clears a short section of track without the need for additional repeater relays.



  The circuits used to return the signal control relays to their normal position, one of which has been defined previously, appear prominently in the drawing.



   A change in the position of one of the control relays may occur during the transmission of the control code just described. If this occurs before the transmission of any of the control pulses i.e. before the ninth pulse, the ST relay energizes again on the eighth pulse and a single code is transmitted. Since the excitation circuit of the ST relay is open at the start of the ninth pulse, the temporary holding circuit, by which the ST relay is kept energized, opens, to drop this relay again if a change of position of l Any of the control relays occurs after the transmission of the eighth pulse. Thus, a new control code is transmitted to indicate the new condition.

   This occurs even if the new indication has already been included in the initial code as assumed in the previous description of the transmission of the busy indication for the track section 2AT on the twelfth pulse of the code.



   As indicated previously, when relay LB drops out and before relay S drops, relay ST is kept energized by the temporary holding circuit which passes through terminal B, normal contact a of relay R, the wire 159, rest contact c of relay SR, wire 236, work contact e of relay S, wire 182, rest contact c of relay LB, wire 183, normal contact a and the winding of relay ST, wire 216, the previously indicated circuit of the ST relay and terminal N. However, it can also happen that, due to a fault, the transmission of the control code is interrupted and that consequently the coding group of the station central does not complete its coding action at the same time as the end of the code at the station.

   When the CS relay is energized at the station, to drop the M relay, the central station coding group begins a normal "drop", with the PC relay still energized. This maintains the reverse polarity to the line circuit, so that the R relays are kept in the reverse position. Thus, when the relay LB drops out, the temporary holding circuit of the ST relay is open to the normal contact a of the R relay, so that the ST relay loses its excitation and drops again to store another control code which will be transmitted as soon as the line circuit will be available. If the OCS relay of the OLC group is energized in advance over the CS relay of the station, the PC relay at the central station drops out, restoring the normal polarity of the line circuit.

   The relay R is then energized with the reverse polarity due to the inversion of its

  <Desc / Clms Page number 43>

 line connections made by the contacts of relay M. The LC group of the station cannot complete its coding action and stops with relay R in the reverse position. When the LB relay drops out, the temporary ST relay holding circuit opens again and that relay drops out to store the control code. Thus, if a line fault prevents the OLC and LC groups from completing their coding action simultaneously, the station start relay drops to store another control code and to ensure that the entire code is received. at the central station.

   It is only if the LOC group completes its coding action at the desired time, so that the PC relay re-establishes the normal polarity of the line circuit, that the station ST remake is kept energized by the holding circuit until until relay S drops to complete the permanent holding circuit.



   We will now describe the operation of the central station device (Figure 1) during reception of a control code. It is understood that the OR relay passes, through the intermediary of the transformer RT, in the right or reverse position on each odd pulse and in the left or normal position on each even pulse. The OR relay thus actuates its timing and counting relays by means of code pulses, in synchronism with the corresponding relays of the transmission station.



   On the first pulse, the 01L, 01, E, PC and PCP relays are energized, as already explained, as do the 02L, OLP, OLB and OLBP relays. However, the 01L relay does not drop because the first pulse is relatively short. Certain selected relays, among relays F, G and S of the central station, are energized on the pulses corresponding to the digits of the station code. In this case, in response to call sign 234, relays 2F and 23G are actuated on pulses 2 and 3 and relays 234S and SP on pulse 4.



  Under reception conditions, the closed contact d of the OLP relay, in the circuits of these relays, is short-circuited by the open contact f of the PCP relay, so that these relays are energized on long pulses, after the closing of the break contact 1 of the respective relay 01L or 02L.



   The excitation of the PCP relay also prepares a circuit passing through terminal B, the work contacts c of the 01L and 02L relays, the work contact e of the PCP relay, wire 59, the work contact c of the SP relay, the upper winding relay KSP of the central repeater station of relay S and terminal N. Since relay SP is energized by means of a closed contact of relay 01L or 02L, the circuit of relay KSP is kept open on the pulse for which the S and SP relays are actuated, and closes as soon as the 0-IL and 02L relays are both energized at the start of the pulse following the final digit of the call sign, i.e. on the fifth pulse when the code is 234. When the KSP relay energizes,

   it completes a holding circuit with its own work contact a, its lower winding, wire 60, the work contact a of the OLBP relay and terminal B. This KSP relay prepares circuits that will be defined ... further to interrupt the control code, if a fourth long pulse is received during this portion of the code assigned to the selection of the station, that is to say during the first eight pulses, It also prepares a circuit, which in order to energize the various delivery relays controlling the delivery to the appropriate panels of the device, the control indications received will be described later.



   The OCR relay energizes on the eighth pulse as previously indicated. Contact work! of the PCP relay maintains the connection passing through terminal B, the work contact a of the OLBP relay, the closed contacts d of the 01L and 02L relays and wires 63 and 64, after the OCR relay has energized. Closing the NO contacts b and d of the OCR relay prepares

  <Desc / Clms Page number 44>

 circuits passing through these wires 63 and 64 and through the work contacts e of the relays 01 to 07 inclusive, whereby a series of intermediate recording relays Rl to R7 are made sensitive to the character of the pulses 9 to 15 of the code.

   In other words, when terminal B is connected to any one of wires 139 to 145 (figure 2c) by a control relay contact, the corresponding pulse of the transmitted code is extended, i.e. say that a positive control indication is transmitted, and the corresponding relay, among relays R1 to R7, is energized at the central station.



  For example, if the ninth pulse is long, as had been assumed during the description of the control code, relay 01L drops out by closing its normally-closed contacts, so as to complete a circuit passing through terminal B, the working contact has of the OLBP relay, the working contact f of the PCP relay, the rest contact d of the 01L relay, the wire 63, the working contact b of the -! * OCR relay, the working contact of the 01 relay, the winding of the Rl relay and the terminal N.

   Relay Rl is energized and completes a holding circuit passing through terminal B, rest contact b of relay RR shown in figure la $ work contact .1. OLBP relay, wire 76, work contact a and the winding of relay R1 and finally terminal N. Relay R1 also closes its work contact b to connect terminal B to wire 49. Note that relay RR recording reset is not energized before this moment, the excitation circuit comprising the working relay c of relay 16.



   Since the fourteenth pulse of the check code was also assumed to be long, relay R6 also energizes on this pulse by a circuit similar to that of relay R1, but including the rest contact d of relay 02Ls wire 64, contact work d of relay OCR and work contact e of relay 06. The holding circuit of relay R6 is the same as that of relay R1, with the difference, however, that it includes work contact a of relay R6. The fifteenth pulse being long, the relay R7 is energized by a circuit similar to that of the relay Rl and appearing clearly in the drawing.



   On the sixteenth pulse, which is long, relay 16 is energized by the same circuit, as that described previously with regard to the control code, When it is energized, relay 16 closes a circuit comprising terminal B, the working contacts c of relays 01L and 02L, the work contact e of the PCP relay, wire 59, the work contacts c of the OCR and KSP relays, wire 93, the work contacts d of the relays 234S and 16, wire 109, the winding of the associated delivery relay 234D and terminal N. The relay 234D is therefore energized to allow the operation of the control relays k, of the group which it controls, in accordance with the positions of the recording relays Rl to R7.

   Relay 234D opens the holding circuits of these relays K through its rest contacts a to g inclusive, and prepares the excitation circuits of these relays by the intermediary of similar make contacts. These excitation circuits pass through wires 49 to 55, the work contacts b of the respective relays Rl to R7 and terminal B, the positions of these latter relays indicating the position of the station control relays of the group controlling the transmission of the code. , It has already been explained for example that the relay Rl is in the excitation position, since the ninth pulse is long. A circuit is then formed by terminal B, work contact b of relay R1, wire 49, work contact a of relay 234 D, the winding of relay 1NWK and terminal N.

   Since relays R6 and R7 are also energized, relays 4AK and 3RWK are energized by analog circuits.



   When any of the control relays of Figure 1d are energized, as just explained, they cause lamps to light on the central station panel to provide a visual indication of positive controls transmitted by the station. For example, the energization of the 1NWK relays produces respectively the ignition of the 1NWE and

  <Desc / Clms Page number 45>

 3RWE. Likewise, energizing the 4AK relay turns on the 4AE lamp in the channel diagram. The circuits supplying the current to the lamps by the work contacts of the control relays are clearly shown in the drawing. The operator is thus warned that the needle 1W is in the normal position, that the needle 3W is in the reverse position and that the track section 4AT is occupied.

   The system of control relays and indicator lamps shown in Figure 1d is a typical system for signaling such indications. It is obvious that other methods can be used for this purpose. It is also possible to add control indications and
 EMI45.1
 additional registremea1s, as seen in figure le. of US Patent 2,411,375 mentioned above. In this drawing we see recording styles, bells and vibrators providing audible indications or a permanent recording. These devices can also be used in the installation according to the present invention.

   Since these indicator circuits do not form part of the invention, they have been represented as simply as possible; the sole purpose of showing the end result of the codes and the operation of the coding groups represented here.



   It should be noted that the excitation circuit of relay 234D first passes through the on contact 51 of relay 234S and then through the on contact 51 of relay 16. In this way, the circuit shown in FIG. 1c is simplified. However, in current practice, the position of these two contacts is usually reversed so as to reduce the number of contacts required on relay 16. Since each of the thirty-five possible stations on a line circuit must be represented by a relay D, thirty-five analog excitation circuits may be required at the central station.

   It then becomes simpler to connect wire 93 to the heel of the contact to relay 16, this contact in the working position with the working contact d of each of the thirty-five possible relays S, must be provided anyway for the selection of stations, and finally these last contacts to the winding of the corresponding relay D. For stations requiring control codes of considerable length, a work contact g of a relay 24 and possibly a contact of a relay 32 must each be connected. in parallel with the work contact d of relay 16, in order to provide excitation circuits for the DA and DB relays of these stations.

   For example, when the central station receives a control code from station 267, whose control codes are twenty-six pulses long, as will be shown a little later in connection with the code stop circuits, a circuit is formed on the twenty-fourth pulse; this circuit is analogous to that already indicated for relay 234 D and includes wire 93, the work contact d of relay 24, a work contact of a 267S relay, the winding of relay 267 DA and terminal N. The relay 267D energizes and completes circuits to deliver the indications received during pulses 17 to 23. As shown for station 234, relay 234DA however energizes on the last pulse of the control code, as shown. will see a little further.



   Since the control code pulse 16 is long, relay 02L drops out. The opening of the working contact c of relay 02L opens the excitation circuit of relay 234 D which therefore drops out. The result is that the various control relays are disconnected from the work contacts of relays Rl to R7 inclusive. The various K control relays, which have been energized by the NO contacts of relay 234D, are maintained.
 EMI45.2
 tie: oent-lIlàimtenmrt l exci: t # -s "1}! 1à: t'll'1! ê mt 'pasBo-e pr'.: bIt" ':' oorJ1llEf'iirr "" 'let13 own working contacts, -and contact them rest corr 3s'> end, rel & iOa 234D. It-, in tésulte.-que les: S ... ndfucatio118 de co: Rtr <31st, received .. from S1; erU. are maintained.



   Since the control code transmitted by station 234 comprises more than sixteen pulses, additional pulses must also be

  <Desc / Clms Page number 46>

 also provided at the central station, so as to receive this particular control code. This is done in the same way as for adding pulses during the command code. The central station coding group still uses relays 16, 17-21, 18-22, 19-23 and 20 to add pulses, these relays being added to the OLC group count chain.



  These relays are energized in the order after relay 16. Relay 20 completes an excitation circuit of relay OCRA, and relays 20 and OCRA then cause a repeat action of relays 17-21, 18-22 and 19. -23.



  The coding action of these expansion relays provides pulses 17 to 23.



   At the start of pulse 17, when the line relay R switches to the reverse position, a circuit is formed to energize the reset relay RR
 EMI46.1
 to zero of the record. This circuit includes the Balé6stmt brvàsé terminal of relay R, wire 81, the working contact of relay 16, wire 82, the upper winding of relay RR and terminal N. When relay RR energizes, it completes a holding circuit passing through its lower winding, its own work contact a, the work contacts c of relays 01L and 02L and finally terminal B. The opening of the break contact b of relay RR cuts the holding circuit of the intermediate relays of registration Rl to R7, which falling. The RR relay then drops off during the first long pulse of the code following its excitation, including pulse 17.



  When relay 01L or 02L drops during this long pulse, opening the working contact of the relay in the rest position cuts the holding circuit of the RR relay which drops. In the code described here, pulse 21 is the first long pulse of the extension group. Thus, the RR relay loses its excitation when the 01L relay drops during this long pulse, and it drops again immediately.



   Note that if a check code is longer than twenty-four pulses, the RR relay is also energized at the start of pulse 25. Its excitation circuit is analogous to that of.
 EMI46.2
 written above, the contact..vill, g,: è1ú. relay z, 6, ét1! -: replaced.:. pa: r: 1tm: working ontact of relay 24. In practice, the working contacts of these relays, such as 16, 24, 32, etc ..., necessary contacts to the installation, are connected in parallel in the excitation circuit of the RR relay, so that the latter is energized at the start of the pulses 17, 25, 33, etc ...



   The fall of the intermediate recording relays prepares them for use again during pulses 17-23. During these pulses, these relays are energized by the make contacts of relays 17-21-20 inclusive. It was specified, for example, by stating the transmission of the control code, that the pulse 21 was long. Consequently, relay R5 is energized by the circuit passing through terminal B, work contact a of relay OLBP, work contact f of relay PCP, idle contact d of relay 1L, wire 63, work contact b of OCR relay, wire 111, work contact g of relay OCRA, work contact f of relay 17-21, wire 117, the winding of relay R5 and terminal N.

   After its energization, relay R5 completes a holding circuit passing through its own work contact a, wire 76, the normally closed contact b of the RR relay, the work contact ..1. Of the OLBP relay and terminal B, this circuit is identical to the holding circuits of these relays during pulses 9 to 15.



   During pulses 17 to 23, the OCRA relay differentiates the work contacts from relays 17-21, 18-22 and 19-23 used respectively during pulses 17 to 19 and 21 to 23. Note that the excitation circuit of the relay R4, which includes the work contact e of relay 20, also includes the work contact h of the OCRA relay. This is possible, since these two relays are energized, by closing their work contact, before relay 02R drops, so as to complete the excitation circuit of relay R4.

  <Desc / Clms Page number 47>

 



   However, station 234, as previously indicated, only transmits twenty-two pulses in its control code. The central station coding group must therefore also return to zero on the twenty-second pulse at the same time as the Station. This is necessary for the line circuit to properly return to its normal idle state. To end the action of the central station coding group, it is necessary to energize the OCS relay. The method used is similar to that already explained and used to terminate the command code.

   However, since the control code of some stations has a different length than the control code, a slightly different circuit is required to energize the OCS relay during control codes. As can be seen in FIG. 1c, adjustable connections are provided for this purpose at the central station. A NO contact of the OMP relay is also included in the circuit to differentiate it from the analog circuit of the control code, when a NO contact of the OMP relay is used. This relay remains idle for an entire control code, since its excitation circuit is opened by the NO contact 1 of the OM relay.



   The circuit used to energize the OCS relay on the twenty-second pulse of the control code goes through terminal B, the normal contact a of the OR relay, resistor R12, work contact 51 of the OLBP relay, wire 90, the rest contacts have relays 20 and 16; the work contact h of relay 17-21, the work contact e of the OCRA relay, an adjustable connection, the work contact c of the 234S relay, the break contact of the OMP relay, wire 80, the work contact j of the OCR relay, wire 74, the working contact b of the OLB relay, wire 48, the winding of the OCS relay and terminal N. The OCS relay is therefore energized and completes a holding circuit passing through wire 90, wire 48, the work contact b of the OLB relay, wire 74 and its own work contact a.



   Closing the work contact b of the OCS relay completes a circuit comprising terminal B, the work contacts c of the 01L and 02L relays, the work contact e of the PCP relay, wire 59, the work contacts. ± of the OCR and KSP relays, the work contact b of the OCS relay, wire 79, the work contact e of relay 234S, wire 110, the winding of relay 234DA and terminal N. The relay 234DA therefore energizes and completes a circuit to energize the relays control K of the final group. These latter relays are therefore energized on the last pulse of the code, via the work contacts of relay 234DA and wires 49 to 55, depending on the relays which are energized in the recording group Rl to R7, the corresponding circuits appearing. clearly in the drawing.

   In this case, the R5 relay is energized, so that the 3TK relay is energized too and attracts its armature. As a result, the 3TKE indicator light comes on, letting the operator know that the corresponding section of track is occupied.



   Opening the rest contact c of the OCS relay causes the PC relay to drop, which in turn causes the PCP relay to drop. As a result of the fall of the PC relay, the line polarity returns to normal, the OR relay being maintained in the normal position by a circuit described previously, which includes the idle contact! of the PC relay and the work contact a of the PCP relay, until the PCP relay drops out. The time relays of the central station then drop successively in the normal order, relay 01L being the last to drop. The fall of relay 02L removes the excitation of relay 234DA, and the fall of the latter, by closing its rest contacts a to g, re-establishes the holding circuits of the control relays K of the final group which were energized. The fall of the OLB relay cuts the holding circuit of the OCS relay, which drops out.

   The opening of the work contact .4 of the OLBP relay removes the excitation of the OCR, KSP, OCRA ,, SP and 234S relays. The opening of work contact. of the OLBP relay drops the energized relays of the group Rl to R7. This completes the reset of 1 '

  <Desc / Clms Page number 48>

 coding equipment at the central station, and since the station which transmitted the control code at the same time returns to zero, the entire installation is now in its normal rest position and is therefore ready for the transmission of additional codes .



   This completes the transmission of a control code by a station and its reception by the central station coding group. It has been shown that the indications concerning the position or the state of all the track devices shown in figure 2d, indications which determine the position of the control relays of figures 2d and 2e, have been transmitted to the central station and recorded on the suitable panels, which in the present case are shown in figure 1d. A single code using a single call sign was required to transmit the information. We then saw that the information appearing on the panels provides the dispatcher with a continuous recording of the conditions of the station in the field.



   In the preceding paragraphs, together with the general operation of the coding groups, the circuits and the relay operations determining the length of the two command and control codes have been explained. It was previously indicated that, thanks to a feature of the equipment, or could terminate a code on an even pulse
 EMI48.1
 que1eoDqueaen, starting with the tenth lmpt, lgib7a.A, the particular station shown, that is, at station 234, both command and control codes end on the twenty-second pulse. However, it has been shown that the lengths of the command and control codes are relatively independent of each other and that the adjustable connections of the central station and the station determine the length of the codes.



  It was only the numbers of the command and control functions of station 234 that required the two codes for that station to be twenty-two pulses in length. As will be shown in a moment, the command and control codes at a station may contain different numbers of pulses.



   To illustrate this feature of the invention making it possible to terminate the code as desired, several examples of code termination at different stations, the codes of which have different lengths, will now be described. Referring now to Figures 3 and 4, there are seen circuits for terminating the code for several stations, the codes of which have different lengths. For clarity, the selected call signs in the drawing are 234, 267,
 EMI48.2
 235, 245s 256 and 278.

   With the exception of stations 234 and 235,1.eçCOdèssd8 Cammader3 de dond1e "ônt-étdem% nt-uBs /% e% ueunwùnffér'enleafl" ehsme 1rtl !!. TÍO: D:; O''lf''s will assume that les- OJIg \ 1lEmrS- 1Sleâaoàea1 àomtl Ctéâ.oo.iqKé.èe in the following table: Length of codes
 EMI48.3
 
 <tb>
 <tb> Station <SEP> ORDER <SEP> CONTROL
 <tb> 234 <SEP> 22 <SEP> 22
 <tb> 267 <SEP> 18 <SEP> 26
 <tb> 235 <SEP> 16 <SEP> 16
 <tb> 245 <SEP> 12 <SEP> 14
 <tb> 256 <SEP> 20 <SEP> 18
 <tb> 256
 <tb> 278 <SEP> 16 <SEP> 24
 <tb>
 
The code lengths at station 234 are the same in the table as those shown previously for that station. Continuity is thus achieved between the preceding description of the coding action and the examples of termination of the various codes.

  <Desc / Clms Page number 49>

 



   The central station circuits necessary to achieve the code terminations enumerated in the preceding paragraphs have been shown in figure 3. This figure will be used in place of the upper right part of figure le. during the presentation which follows.



   The terminations of the various wires shown to the left of FIG. 3 serving to connect this figure to the rest of FIG. 1c. The work contacts of the station selector relays S for the various stations used have been shown in this representation. The windings of the relays, nor the control circuits of these, have not been shown. The control and the excitation of these relays are identical to those represented and described previously for the relay 234S; there is therefore no need to repeat them here.



   As has already been explained, in order to terminate the command code or the control station at the central station, it is necessary to ecite the OCS celais, so that it terminates the coding action. Thus, the work contact b of relay 2545, when it is closed, establishes a connection between wires 85 and 80, passing through the work contact a of the OMP relay, in order to energize the OCS relay on the twelfth pulse and thus terminating the command code transmitted to this station. The NO contact of the OMP relay in this circuit determines that it is a command code, and as already indicated, the NO contact of the OCR relay, in the circuit between wire 80 and the winding of this relay, prevents the OCS relay from energizing on the fourth pulse of the code.



   Likewise, the work contact c of relay 245S establishes a connection between wires 86 and 80, passing through the rest contact a of the OMP relay, in order to energize the OCS relay on the fourteenth pulse of a control coda. The rest contact of the OMP relay in this circuit again establishes the fact that the central station receives a control code, and the working contact of the OCR relay prevents the OCS relay from energizing on the sixth pulse of the code, This action synchronizes the reset to zero of the central station coding group with that of the station coding group 245, and both groups complete their coding action during the check code on the same pulse, as already explained.



   Likewise, the make contact b of relay 235S establishes a direct connection between wires 87 and 80. Thus, the command and control codes of this station end on the sixteenth pulse. No OMP relay contact is useful, since both codes end on the same pulse. The command code for station 218 also ends on the sixteenth pulse, but since the control code is longer in this case, the connections to terminate this command code extend from wire 87 through the work contact. b from relay 278S and the work contact a from relay OMP up to wire 80.



   Since the command and control codes for stations 234, 267 and 256, and the control code only for station 278, are all longer than the normal length corresponding to sixteen pulses, it is necessary to use the control relays. the extension count chain during the coding action to or from these stations. Excitation of the OCS relay is therefore controlled via the contacts of these relays in the extension chain. For example, in the case of station 234, the excitation current of relay OCS is controlled by the work contact h of relay 17-21, as indicated above with regard to the coding action at station central. The circuit is extended by the working contact e of the OCRA relay, the working contact b of the 234S relay, the working contact of the OMP relay and wire 80.



  This circuit causes the OCS relay to be energized on the twenty-second pulse. As can be seen in the drawing, an analog circuit is used to terminate the coding action of the control code, with the difference that the work contact c of relay 234S and the break contact are used.

  <Desc / Clms Page number 50>

 a from the OMP relay. A circuit arrangement similar to that used for station 235 could be used, if desired; in the latter case, only one working contact of relay S is used, since the two codes end on the same impulse; in other words, the contacts of the OMP relay are short-circuited by a connection passing through a single make contact of the S relay and leading directly to wire 80.



   As for station 256, the current supplies the OCS relay during the command code, passing through the work contact h of relay 19-23, the rest contact f of the OCRA relay, the work contact 12 of relay 256S, the work contact! : from the OMP relay and wire 80. As a result, the OCS relay is energized on the twentieth pulse. Since this relay then immediately establishes a hold circuit, energizing the OCRA relay during pulse 20 therefore has no effect on the OCS relay.

   At this station, the control code is shorter than the control code, since it ends on the eighteenth pulse. The circuit then supplying the OCS relay passes through the work contact h of relay 17-21, the rest contact e of the OCRA relay, the work contact e of relay 256, the rest contact a of the OMP relay and wire 80. Thus, we sees that the control code may be shorter than the control code transmitted to a station, if the track devices require more control functions than control functions.

   For station 267, the control code ends on the eighteenth pulse, the circuit being analogous to that just described for the termination of the control code of station 256, with the difference that the contact works b of relay 267S and work contact a of relay OMP are used in the circuit. The control code for station 278 requires twenty-four pulses. Here the OCS relay excitation circuit passes through the work contact h of relay 19-23, the work contact f of the OCRA relay, the break contact 1: of relay 20, the work contact c of relay 278S, the break contact a OMP relay and wire 80. The normally closed contact f of relay 20 is required in this circuit to prevent the OCS relay from energizing on the twentieth pulse.

   In fact, except when the rest contact f of celais 20 is open, the work contacts of relay 19-23 are still closed for a time sufficient to energize the OCS relay, after the OCRA relay has been energized during the twentieth pulse.



   It was assumed that the control code for station 267 was greater than twenty-four pulses in length, and required twenty-six pulses. Thus, it is then necessary to add extension counting chain relays to the central station. It was previously indicated that these relays are added in a manner analogous to those already represented in FIG. 1. To terminate the control code on the twenty-sixth pulse, the normal circuit for energizing the OCS relay passes through the work contact. h of a relay 25-29, the closed contact e of an OCRB relay, the working contact e of the 267 S relay, the closed contact a of the OMP relay and wire 80.

   Relay 25-29 is the first relay in the additional counting and expansion chaiae, the OCRB relay used to prepare circuits to produce the repeat action of relay 25-29 for pulse 29. However, if no other code in the particular line circuit under consideration required more than twenty-eight pulses or more than twenty-six pulses as shown here, the OCRB relay could be eliminated, since no repeating action would be needed of the second count chain or extension chain. The OCS relay excitation circuit would then be connected directly from contact h of relay 25-29 to the work contact of relay S, this connection being indicated by a dotted line in Figure 3.



   Turning now to Figure 4, it shows a composite system of circuits representing the termination connections of

  <Desc / Clms Page number 51>

 code to the various stations listed above. The drawing of figure 4 is analogous to the upper right part of figure 2c. The terminals shown at the top left of Figure 4 serving to connect this figure to Figure 2c. The connections necessary to terminate the control codes on the appropriate pulse are indicated by a thick dotted line between the wire 200 on the one hand and on the other hand the wires 201 to 204 or the wires coming from the various contacts of the terminals. CRA relay.

   The reference numbers associated with the various connections shown serve to designate the stations to which the connections lead, it being understood that FIG. 4 is a composite drawing of several stations and does not represent the circuits of any single station.



   As explained previously, the CS relay is energized at a station so as to end the coding action only on a control code. It is not necessary to energize the CS relay during the command code, since the reset action in this case does not depend on this relay. Rather, current must be supplied to wire 200 during a check code, so that the CS relay can energize and thereby produce the appropriate reset action at the station.



   At station 235 a connection is made between wires 204 and 200 to allow relay CS to energize on the sixteenth pulse and thus terminate the control code. Although the command code also ends on the sixteenth pulse at this station, the CS relay is not energized on the final command code pulse because of the working contact h of the M relay, which is included in the circuit. of the CS relay as indicated previously. Since relay M remains inactive during the command code, this contact is opened to cut the relay CS field circuit. At field station 245, a connection is reestablished between wires 203 and 200 to cause the CS relay to energize on the fourteenth pulse and thereby terminate the check code on that pulse.

   The already mentioned working contact of the CR relay, which is in the energizing circuit of the CS relay, prevents the energizing of this relay during the sixth pulse. It should also be noted that, if one wishes to give the command code intended for this station 245 a length of sixteen pulses, instead of twelve pulses as had been supposed, the work contact 11 of the relay M, contact located in the CS relay excitation circuit, allows the correct termination of the control code and at the same time prevents the coding action from terminating too early during the control code.

   It can be seen that the control code intended for a station can be longer than the control code, if desired, even though both codes are sixteen pulses or less in length.



   At station 256, current is supplied to wire 200 during a control code;, passing through the work contact h of relay 1A-1 and the closed contact a of relay CRA-1, in order to energize relay CS on tenth impulse. At station 234, it is desired to energize the CS relay on the twenty-second pulse of the control code. The current thus feeds the wire 200 passing through the working com @@ nt h of the relay lA-1 and the working contact d of the CRA-1 relay, as has already been explained with regard to the complete control code.

   At station 278, the CS relay is energized on the twenty-fourth pulse, and the current feeds the wire 200 and the winding of this relay passing through the work contact h of the relay 3A-1, the work contact 2 of relay CRA-1 and the rest contact e of relay 4A-1.



  The rest contact e of relay 4A-1 is included in this circuit to prevent relay CS from being energized on the twentieth pulse, since relay CRA-1 energizes during this pulse, while the open contacts of relay 3A- 1 are still closed, as explained in the analogous case of the central station coding group.

  <Desc / Clms Page number 52>

 



   It was assumed that the control code of station 267 must necessarily consist of twenty-six pulses. It is therefore necessary to use at this station a second extension group, group N 2 represented in figure 4. The excitation circuit of relay CS on the twenty-sixth pulse passes through the work contact h of relay lA-2, the contact rests at the CRA-2 relay and the adjustable connection terminating at the 200 wire and consequently the coil of the CS relay. It is desirable that all expansion groups added to stations be identical with regard to interior wiring and exterior connections.

   Thus, even if the CRA-2 relay is never energized at this station, it is not possible to remove the contact of this relay in the circuit of the CS relay at station 267, as was done at station central, where relays are added only to meet the needs of the extension metering chain.



   It has therefore been shown that the coding action at any station can be terminated on any even pulse as desired, regardless of the code length at other stations.



  The command and control codes at a station can also have different lengths, as desired, these lengths being chosen according to the need to transmit the command functions and control indications, between the central station and the station. in campaign. By using an adjustable connection system, it is possible to use identical coding groups and extension groups at all stations. The desired length of the code is then determined by the appropriate installation of junction bars between the various terminals provided to establish the various adjustable connections.

   At the central station, the length of the code and the synchronization between the central station and the station during a control code do not depend on the coding group of the central station, but on relays and external connections that are completed as needed for perform the desired operation and complete the various codes. A very flexible remote control system can thus be installed, using standard pieces of equipment, to achieve a desired operation at each station.



   We will now explain how the installation is restored to the normal state in the event of an operating fault.



   A command code can be terminated on an odd pulse following a fault, relay 01T being maintained for example by means of wire 68. Relay OR is then maintained in the reverse position, until the 01L, OLP, OLB and OLBP timing relays drop, relay 02L remaining energized. The OLBP relay then drops the OM relay and opens the circuits of the counting and selection relays. The fall of the OM relay, with the OR relay in the reverse position, allows the PC relay to be energized and this causes the PCP relay to be energized. The drop of the CM relay also suppresses the excitation of the 01T relay, which drops out almost immediately.



   At each station, relay R remains at rest and the timing relays drop in the same order, relay 2L remaining energized. The LBP relay opens the circuits of the count and select relays to prevent reception from continuing. Falling relay 01T closes the line circuit, but the R relays do not energize because the line polarity has been reversed by the PC relay.



   When the PCP relay is energized, the OR relay switches to the normal position, thanks to the circuit comprising terminal 0, its lower winding, the rest contacts e of the 01T and OM relays, the working contacts f and b of the PC and FGP relays respectively , the OFF contact 1 of the OLBP relay, the working contact! of relay 02L, the rest contact f of relay 01L and

  <Desc / Clms Page number 53>

 the N terminal. The time relays of the central station are thus energized again and the PC relay loses its energization; the latter drops out before its holding circuit is completed by energizing the relay
OLBP. The drop of the PC relay removes the excitation of the PCP relay.

   The central station time relays then drop out in the normal order following removal of the 02L relay energization, the 01L relay being the last to drop.



   When the PC relay drops out, it restores the normal polarity of the line, so that all the R line relays simultaneously return to the normal state, slightly after the OR relay, energizing their time relays again. These then fall back to each station in the normal order, because the 2L relay is no longer excited, the IL relay being the last to drop.



   If a command code ends on an even pulse before the desired final pulse, due to the 01T relay failing to energize, the OR relay is held in the normal state and the time relays drop out. normal order, the OLBP relay deactivating the counting and selection relay circuits, as well as the OM relay. As usual, relay 01L drops out last. The station line R relays remain energized and their time relays drop in the normal order; as at the end of a complete code, the relay
IT being the last to fall. This action is analogous to that which occurs when intentionally terminating a command code on a chosen even pulse, with the difference that the OCS relay does not energize.



   If a control code ends on an odd pulse, as for example in the case where the 1T relay remains energized following a fault, the OR relay remains in the reverse position until the OLBP relay drops out, relay 02L remaining energized. The OR relay returns to its normal position after the closed contact! of the OLBP relay, using the circuit indicated above and comprising the PC, PCP and 02L work contacts, and the rest contacts 1: of the OLBP and 01L relays.



   At the transmitting station, relay R remains at rest, and timing relays IL, LP, LB and LBP drop out. The opening of the work contact !! relay LB drops relay M, which in turn drops relay 1T. This results in the removal of the ldgne shunt applied by contact b of relay T, while contacts b and g of relay M reverse the line connections of relay R, so that the latter remains at rest, since the central station PC relay is still energized.

   Thus, the equipment is placed in the same state as at the other stations, where relay R and the time relays remain at rest, with relay 2L energized,
When the OR relay is returned to the normal state, the central station time relays are energized, while the PC relay loses its energization and drops out before the OLBP relay energizes. The time relays of the central station then drop in the normal order, relay 01L being the last to drop. When the PC relay drops, it restores the normal polarity of the line, so that all R line relays energize simultaneously by energizing their time relays again. These then fall back to each station in the normal order, the IL relay being the cernier to fall.



   If a control code ends on an even pulse other than the chosen pulse, due to the failure of the 1T relay which does not energize, the OR relay remains in the normal state until the time relays drop. 02L, OLP, OLB and OLBP. Closing of the rest contact f of the OLBP relay completes a circuit intended to switch the OR relay to the reverse position; this circuit passes through terminal B, the contact

  <Desc / Clms Page number 54>

 working of the PCP relay, the contacts rest! of the 02L and OLBP relays, the working contact b of the PCP relay, the working contact 1 of the PC relay, the neutral contacts e of the OM and OT relays, the lower winding of the OR relay and terminal 0.



   At the transmitting station, relay R remains energized and time relays 2L, LP and LB drop out. Relay LB drops relay M which reverses the connections of relay R. This switches to the reverse position. since the line polarity is still reversed, and it energizes the time relays again, which then drop in the order 1L, LP, LE and LBP, the equipment being in the same state as at the other stations, where the relay R and the time relays remain at rest, with relay 2L energized.



   At the central station, since the OR relay has changed to the reverse position after the OLBP relay has dropped, the PC relay excitation circuit closes when its holding circuit opens, so that this relay remains energized. The time relays of the central station are energized again and then drop in the order 01L, OLP OLB and OLBP, the relay 02L remaining energized. The OR relay is returned to its normal position, when the rest contact f of the OLBP relay closes again by a circuit indicated previously which includes the work contacts of the PC, PCP and 02L relays, and the rest contacts of the OLBP and 01L.

   When the OR relay has returned to its normal position, the time relays of the central station are energized again and the PC relay loses its excitation, falling back before the OLBP relay energizes. The time relays of the central station then drop in the normal order, as in the previous examples. The PC relay returns the line polarity to normal to energize the station line relays, the station time relays then being re-energized and released in the normal order, as in the previous examples.



   It can be seen that in all cases, whatever their initial positions, the OR and R line relays are all returned to the normal position approximately at the same time, so that each of them drops its time relays in the normal order. so as to place all the coding groups in the appropriate receive state, before relay 01L or any of the relays 1L drops out, in order to allow the start of the next code. In general, there is a chance that the central station will transmit the following code, because the 01L relay drops slightly before the IL relays.



   It has already been explained that if a control code is interrupted due to a fault after the station start relay ST has been energized again, the ST relay drops again due to the fall of the LB relay, before relay S does not drop itself. It is therefore clear that each interrupted control code will be retransmitted in full when the line becomes usable again. This is only true of a control code in the case where the interruption occurs before the drop of the central station start relay ST, which drop occurs on the eighth pulse of the call sign. , you must press the STB start button a second time.



   It may also happen that the OR relay is actuated by one or more pulses of a foreign current, or as a result of a temporary opening or short-circuit on the line when the system is in its normal state of rest. . In this case, the first inversion of the OR relay energizes the PC relay, reversing the line polarity and dropping the R line relays to prevent the initiation of a code by any station. When the malfunction is over, the system automatically returns to the normal state, in the same way as in the case described above of interrupting a check code.

  <Desc / Clms Page number 55>

 



   A description will now be given of the means used to prevent interference and to transmit the codes only one at a time in the desired range when two or more transmitters have codes stored for transmission. The inclusion of the rest contacts b of relays IL and 2L in the excitation circuit of each relay M, and in the circuit similar to the OM relay, prevents the initiation of a code, except in the case where the line is free , as has already been explained, but it can easily happen that the central station and one or more stations initiate codes substantially at the same time.

   If the OM relay is energized, the command code wins, since the rest contact b of the eN relay opens the circuit to the PC relay, and the long pulse generated by the 01T relay maintains the line relays R at rest to energize the receiving relay SR at each station as in the command code already described. At any station, where relay M has been energized to start a control code, this relay is reset by opening the closed contact of the SR relay. As a result, all of the station coding groups are in a condition to receive the control code on the first pulse, the control codes being stored for subsequent transmission.



   In the event that the coding groups of two or more stations start control codes at the same instant and by their combined action place the coding group at the central station in reception state, the shunts applied to the line by relay 1T which is the closest to the central station regulate the operation of the R line relays at the more distant stations at the same time as at the considered station. The 1T relays operate simultaneously as long as the corresponding pulses of the respective call signs have the same character. When a 1T relay applies a shunt to the line to generate a long, odd pulse, it operates by priority on any 1T relay that drops to a more distant station for which the callsign requires a short pulse.

   When the 1T relay of 1 nearest station energizes to apply a shunt to the line, terminating a short, even pulse, it operates by priority on any 1T relay whatsoever which is held idle by the 2T relay at a more distant station, as needed for a long, even pulse. In either case, the R and 1T relays at the more distant station simultaneously occupy their idle positions on one of the call sign pulses, i.e. before selection. local relay S.

   This interrupts the temporary holding circuit of relay M, a circuit which includes terminal B, normal contact a of relay R, rest contact d of relay 1T, wire 179, rest contact g of relay S, wire 178, the working contact e to the LB relay, the closed contact f of the SR relay, the working contact a and the winding of the relay M, and finally the terminal N. The relay M therefore drops out and reverses the line connections of the relay R.

   Since the line is now supplied with current of reverse polarity, the fall of the relay M makes the associated relay R of the station inoperative.
 EMI55.1
 lower insensitive to the rest of the code, by doing, ntumb13t> .ar .., isntmporized L, -and 1.err1J! left ëxc.ténù ^ arêiaxet d: cou,: floorE, -à6td6e a $ a <tlejjxe doiat le cOdecesctremmagasné pou (/. "8tr.e tranomts 1 lateremegtgne 13.0r & L VeCIUVenUe b: ne.l <.Ll.é "nr ::> will be eev.!. J.1Jt'e.



   With regard to the action of the line, it can therefore be seen that a long and odd pulse acts by priority over a short pulse and that a short and even pulse acts by priority over a long pulse. For this reason, it is desirable to assign call signs to several stations in a geographical order, so that each call sign is higher in priority than the codes of more distant stations and, on the contrary, is lower than the codes of stations. closer to the central station.

   Regarding line action, the order of priority of the call signs

  <Desc / Clms Page number 56>

 is indicated by the following table in which each code is greater than those found below in the same column and all those found at its aroite in the other columns.
 EMI56.1
 
 <tb>
 <tb>



  357 <SEP> 368 <SEP> 578 <SEP> 458 <SEP> 235 <SEP> 257 <SEP> 268
 <tb> 358 <SEP> 345 <SEP> 567 <SEP> 456 <SEP> 237 <SEP> 258 <SEP> 245
 <tb> 356 <SEP> 347 <SEP> 568 <SEP> 478 <SEP> 238 <SEP> 256 <SEP> 247
 <tb> 378 <SEP> 348 <SEP> 678 <SEP> 467 <SEP> 236 <SEP> 278 <SEP> 248
 <tb> 367 <SEP> 346 <SEP> 457 <SEP> 468 <SEP> 234 <SEP> 267 <SEP> 246
 <tb>
 
Note that a different order of priority prevails when codes are transmitted from the same station, in which case a long pulse has priority over a short pulse. For example, if all of the start buttons at the central station have been pressed at the same time, the idle code 234 is the first to be transmitted and the code 678 is the last transmitted.



   To ensure additional security against the simultaneous transmission of control codes from two stations, in the event of a fault, an additional circuit is provided at the central station comprising the stop and synchronization relay XS. The XS relay is used to interrupt the transmission in the event that a call sign comprising more than three digits is received. Suppose, for example, that one station transmits the call sign 235 and that another station simultaneously transmits the code 245. If this occurs, the selector relay 234S is actuated on the fourth pulse to select a call sign. panel which does not belong to any station, and the KSP relay is actuated on the next pulse, the fifth in this case, as has already been explained.

   When the KSP relay energizes, its contacts b and d transfer to the contacts d of the counting relays to wire 57, the connections of wires 63 and 64. If the fifth pulse is long, a circuit is formed, when relay 01L drops out. , passing through terminal B, the work contact a of the OLBP relay, the work contact f of the PCP relay, the open contact d of the 01L relay, wire 63, the open contact b of the OCR relay, the work contact b of the relay KSP, wire 57, the winding of relay XS and terminal N. The relay XS energizes and completes a holding circuit passing through its work contact a, the work contact k of the OLBP relay and terminal B. The relay XS is also excited on the seventh pulse by the circuit defined above if this pulse constitutes the fourth digit of the code received.

   The XS relay can be energized in the same way on the sixteenth pulse by the circuit comprising terminal B, the working current a of the OLBP relay, the rest contact d of the 02L relay, wire 64, the rest contact d of the OCR relay, the contact KSP relay d work and wire 57. On the eighth pulse, the OCR relay energizes, opening the circuits shown above, to prevent the XS relay from operating during the second duty cycle of the OLC count relays.

   However, in the case where this eighth pulse is the fourth long pulse of a received call sign., The OCR relay prepares, to energize the XS relay, a circuit passing through the wire 64, the work contact d of the OCR relay , the working contact e of relay 08, the working contact d of the KSP relay, wire 57, the winding of relay XS and terminal N.



   As a result, if the central station receives a call sign containing more than three long pulses, the XS relay is energized on the fourth of these received long pulses. When relay XS energizes, it completes a circuit to energize relay 01T. This circuit passes through terminal B, work contact b of relay XS, rest contact d of relay OM, rest contact b of relay 02T, the winding of relay 01T and terminal N. Relay 01T opens the relay circuit. line by its idle contacts b and to to drop the line relays R to the stations

  <Desc / Clms Page number 57>

 transmission if these relays are energized, and to interrupt the control code.

   At this point, depending on whether the fourth long pulse is received on an even or odd pulse, the action is analogous to the reset and synchronization described previously, which takes place when a check code is interrupted by a any fault.



   It is clear from the above that no interference occurs when several ST start relays of the central station and stations are actuated at the same time or when the line is busy; It is also clear that the codes are transmitted in this case only one at a time in an order according to the relative priorities of their respective call signs.



   The installation in accordance with the invention also provides for arrangements to prevent stations having priority codes from monopolizing the use of the line under heavy traffic conditions, or in the event that the starting relay ST station is not energized due to a fault at the end of a code. This is achieved by providing a station sequence SS relay in each station coding group. The SS relay serves to prevent the initiation of a second code by any station coding group which transmitted a code, as long as any other station coding group has a code stored for subsequent transmission.



   If we consider Figure 2, we see that the SS relay is energized during a control code on a pulse representing the third digit of the call sign. The current is supplied by terminal B, the work contact f of relay 1L or the work contact f of relay 2L, wire 165, the rest contact e of relay SR, wire 169; the working contact b of relay S, the winding of relay SS and terminal N.

   It should be noted that during the coding action one or the other of the relays 1L and 2L is always energized so that current is continuously supplied to this circuit. When relay S drops during the final pulse of a code, relay SS is kept energized by a holding circuit comprising the rest contact b of relay S, its own work contact a, wire 165, the work contacts f of the relay IL and 2L and terminal B. This holding circuit is opened by relay 1L when the equipment returns to its normal idle state at the end of a code.

   The SS relay has a delayed fall and its normally closed contact b keeps the starting circuit open for an additional time interval; during this interval, another station can start a code and thus keep relay SS energized, since relay 2L itself remains energized during the coding action at another station. Therefore, when the SS relay has been energized, the station coding group is made unable to start a second code, as long as the line is not free for a time longer than the normal time interval between codes. successive. Each station coding group, which has a stored code and in which 1 the SS relay does not have. been activated, can access the line after the 1L relay drops at the end of a code.

   As a result, each of these coding groups transmits a single code during which its SS relay becomes energized. At the end of this series of codes, a longer period of time elapses to allow the SS relays to drop, after which the station groups are reset again to transmit successful codes.



   In the case where a control code is interposed in a sequence of control codes, as explained above, for the purpose of controlling a particular device, and where the SS relay of the station coding group controlling this device has been energized, this SS relay is reset by the operation of the station receiver relay SR and the station selector relay S in response to the command code. In other words, when the relay S, at the station chosen by the dialing code

  <Desc / Clms Page number 58>

 activates, energizes and cuts the SS relay holding circuit via its closed contact b, the normal SS relay excitation circuit, which was completed by the working contact b of the S relay, is now open by the closed contact e of the SR relay, so that the SS relay loses its excitation and eventually drops out before the end of the command code.

   The coding group of this station is thus enabled to indicate more quickly the condition in which the actuated device is found.



   It is also evident that each SS relay also serves to prevent the continuous initiation of incomplete codes by a station storage group., Following a fault, if other groups have codes stored for their storage. transmission. This is true provided that the fault is not such as to prevent the SS relay from being energized, as would be the case, for example, if the code transmitted by a station coding group having a higher code did not progress far enough to energize relay S at this station.



   To avoid this drawback and other periodic conditions ae ae starting, a thermal cut-off relay COR is provided, arranged as shown in FIG. 2a. The COR relay is energized ;, whenever a control code is initiated by the coding group, from the moment the start relay ST drops to start the code until the moment the code has been fully transmitted . As long as the SS relay is not energized by the S relay on the station selection pulse, the COR relay is energized by the circuit comprising terminal B, the reverse contact b of the ST relay, the rest contact b of the relay SS, wire 147, the working contact b of the RP relay, the closed contact a and the heating element of the COR relay, and finally the N terminal.

   When relay M is energized, it makes a connection passing through terminal B and its own work contact g to energize relay COR until the end of the code.



   The time during which the relay COR is energized may exceed the time required to transmit a code from the associated coding group even if there is no fault, with, between the two times, a difference equal to the time required to transmit one code from each coding group having a higher call sign. On the other hand, in the event of a fault preventing the ST relay from energizing again, the COR relay energizes more or less continuously. The COR relay is selectively sensitive to a fault by setting it so as to open its contact as after the relay has been energized, for a time interval of about two minutes the opening of this contact cutting off the power to its element. heating circuit as well as the relay M.

   Contact a of the COR relay is of the click type and remains open for about two minutes; when it has closed, if terminal B remains connected to wire 147, it operates in a cyclical fashion with closing periods of one minute and opening periods of approximately two minutes. The COR relay therefore operates in such a way as to prevent the faulty transmitter from accessing the line for approximately two minutes for each three minute interval as long as the fault persists.



   The installation according to the invention also comprises an RPP fault relay, by means of which any station coding group can be easily isolated from the line. This is useful for example in the case of a short circuit occurring in the line connections, in the case of a faulty operation due to an abnormally low voltage of the local battery, or to terminate the cyclic operation at the relay. HORN. This characteristic was described in the American Brer vet N 2.376.569 of May 22, 1945. The RPP relay is a slow-drop relay, which is kept normally energized by a repeating relay RP of the line relay R. The RP relay is controlled according to the coded operation of relay R, as long as the RPP relay remains

  <Desc / Clms Page number 59>

 excited.

   In the normal operation of the system, the relay R may remain inactive for a maximum period of about six seconds, this time being necessary to transmit a control code with thirty-two pulses from one station to another station. . We drop the baton
RPP slowly enough, to cap this time interval, by connecting the delay resistor-capacitor to its terminals. The energy stored in capacitor C2 achieves a drop period of 10 to 15 seconds, so that the RPP relay does not drop out, unless the R and RP relays remain idle for an abnormal period of time, as would be the case. if a short-circuit occurs, for example between the make and break contacts a of relay M.



   The RPP relay of each station can be put to rest by hand from the central station by pressing the disconnect button DB in figure 1a, for an appropriate time, for example equal to fifteen seconds. The 01T relay is thus energized via the rest contact g of the OM relay and the rest contact b of the 02T relay. As a result, the line circuit is opened by the rest contacts b and d of relay 01T, by releasing relays R, RP and RPP successively. When the RPP relay drops out, its rest contact b short-circuits the resistor R3 in series with the relay R. At the same time, the work contact of the RPP relay opens to introduce a similar resistor R5 in the circuit of the relay R , at a point adjacent to the y and Z line wires.

   As a result, if the system can no longer operate due to a short circuit in the coding group, the line fault is cleared by introducing a relatively high resistance in series with the group, resistors R3 and R5 generally having in practice a value of the order of 10,000 ohms each. The transmission part of the coding group is thus effectively isolated from the system. At the same time, the starting circuit comprising the wire 147 is opened by the work contact b of the RP relay to prevent the COR and M remakes from remaining energized.

   At each station where no fault exists, the relay R energizes in response to the release of the disconnect button DB, since the effect of the fall of the RPP relay, with regard to the relay R, is to replace all simply resistor R3 by an equivalent resistor R5 in its circuit. However, the RP and RPP relays remain at rest after the R relay has energized, the RP relay holding circuit being opened by the working contact c of the RPP relay and that of the RPP relay being opened by the working contact a to the RP relay.



   The operator of the central station can now put the system back into operation, while leaving one or more coding groups at the station isolated, by successively transmitting control codes to the various coding groups he wishes to include in the restored installation. operation. When the station selector relay S is energized on the impulse of a command code, as explained previously, a connection passing through the make contact e to the relay G2R, wire 176 and the lower winding of the relay RP, provides an excitation circuit for the RP relay. Closing the make contact a of the RP relay energizes the RPP relay to complete the RP relay holding circuit and to return the coding group to normal operation.

   It is obvious that a command code is not received by a station where the relay R is short-circuited for example, and that such a station consequently remains isolated.



   To facilitate the restoration of the installation as explained above, an RCB callback push-button is provided at the central station (fig.lb), by means of which the operator can send a special callback code to a station. any without activating any device of this station. This callback code ends after the transmission of the part to the code used to select the station, i.e. on the ninth

  <Desc / Clms Page number 60>

 impulse. The callback code also serves to initiate transmission to a control code from the selected station and thus allows the operator to obtain new control indications without causing any change in the conditions of the station devices.



   In order to initiate a recall code, the operator presses the RCB recall button and also the STB start button on the control panel of the station to which the code is to be sent; it thus energizes the corresponding start-up relay such as the 234ST relay. This in turn energizes the OM relay as we have already explained, and a circuit then closes passing through terminal B, the working contact! from the OM relay, wire 83, the now closed contact a to the RCB pushbutton, the winding to the return hold RCL relay and terminal N. The RCL relay is energized, completing a holding circuit passing through its work contact a, wire 72, work contact e of the OLBP relay and terminal B.

   The RCB push-button can then be released and transmission continues for eight pulses, during which the selector relay 234S of the central station and the corresponding relay S of the selected station are energized as in the command code already described. When the ninth pulse is reached, relay 01 is not energized, its second excitation circuit being opened by the rest contact b of the RCL relay. As a result, the 01T relay is kept energized by wire 68, until the OLBP relay at the central station and the LBP relay of the selected station drop.



   At this station, when relay LB drops, the holding circuit to relay ST passing through wire 183 is transferred from terminal B, near to the work contact c of relay LB, to terminal 241, and passes through the rest contact ± . of relay LB, wire 182, work contact e of relay S,
 EMI60.1
 the wire -236 -and the cOl1tact ...: work: I ±. - dtr ': reIais .SR.fü: iBq1Ïe le reh.1s. R :: is. passed EU reverse position on the ninth pulse, this holding circuit is opened by the drop of relay LB, whether or not terminal 241 is connected to the normal contact a of relay R as explained above.



  Since both SR and S relays are energized, the SS relay has already dropped if it was previously energized, and the fall of the ST relay therefore places the station coding group in a state to start a control code as soon as the line will be free again. We see that, on the ninth pulse of the callback code :. the RCL relay is reset by the OLBP relay and the installation is then in the same state as in the case where a control code is interrupted on an odd pulse following a fault. As a result, the installation is restored to its normal state by the same series of operations as that described above, for this condition.



   In the previous description of the transmission of a control code by the installation according to the invention, it has been emphasized that all the signals, hands and other devices of an interlocking, such as that shown in FIG. 2d ; can be controlled remotely from a central station by transmitting only one code requiring only one station selection code.

   Likewise, it has been shown that the indications relating to the position of signals and points, to the occupation or non-occupation of track sections, to the state of other devices, can all be transmitted from the station to the central station. during a single control code, using only
 EMI60.2
 quytan only call sign and selection sign, to make sure that the signs are displayed on the appropriate group of central station panels. These codes can be of any length desired or necessary to convey the necessary functions. The command and control codes for any station may also have different numbers of pulses.



   In installations currently generally used for

  <Desc / Clms Page number 61>

 To achieve such a remote command, the length of the codes is generally fixed at sixteen pulses, for both the command code and the control code. Thus, in order to operate the installation of FIG. 2d, two codes each comprising sixteen pulses would be necessary in each direction. On the other hand, two call and selection signs would be essential to select the different groups of devices to be controlled by each code. This reduces the total number of stations that can be controlled by a single central station coding group.

   Because some of the available call signs cannot be combined with a station without providing considerable additional equipment, the geographical position of a remote station, such as the station shown, may prevent economic use. codes which should normally follow in the order of the system sequence. This further results in a further reduction in the number of stations which can be assigned to a central station coding group.



   In older systems, in which all codes included the same number of pulses, the action of synchronizing the resets of the central station and the station at the end of a code was relatively easy and was carried out mainly by maintaining the same decay time for the different relays in all coding groups. When the different stations have different code lengths, the problem of stopping the coding action of the central station on the appropriate pulse is more difficult. As has been shown, this action is carried out by the new use of adjustable connections making it possible to obtain a variable selection of the pulse on which the coding action must stop, and also by use at the station. central relay that differentiates two adjustable connections for any single station.

   Thus, by inserting in each adjustable connection of this station the contacts of the station selector relay of the central station, it is possible to stop the coding action of the groups of the central station and of the station, in particular during the control codes, on the same pulse of the code, so that it becomes possible to synchronize the reset actions at the central station and at the station.



   The installation according to the invention, even if additional pulses are provided in the control code, does not require one or more additional groups of intermediate recording relays at the central station to record the positive indications received before their delivery to the central station. control relay. The single group of recording intermediate relays is reset, by means of a new circuit arrangement comprising a single relay, at the end of each group of eight pulses which transmits the control functions and this group of relays is used again during the next group of similar pulses.



   The installation in accordance with the invention consequently has several particular advantages over similar installations currently used. First, the command and control codes can be of any desired length necessary to transmit in a single code all the command or control functions corresponding to a station. This naturally allows a greater number of stations to be controlled by means of a single central station coding group, since only one station call sign is required for each station. While providing these advantages, the invention also makes it possible to use at a station less additional equipment than with old installations.

   Synchronization between central station and stations is maintained, although code lengths may be different, thanks to adjustable connections and a synchronization relay. With all these advantages, the different

  <Desc / Clms Page number 62>

 items of equipment used are, however, kept identical for all stations.



   A single embodiment of the invention has been shown and described here, but it is understood that various modifications can be made to the installation described without thereby departing from the spirit of the invention and without departing from its scope. field.



   CLAIMS
1) Remote control installation, in particular for controlling railway traffic, characterized by the fact that it comprises a central station and several stations connected by a line circuit, the central station and each station being equipped with code transceivers for transmitting and receiving selective codes between the central station and any particular station, each code comprising a first part consisting of several pulses forming a distinctive call sign for selecting a particular station, and a second part consisting of several pulses to control certain devices of the station in question or to indicate to the central station the status of these devices,

   the second part of a code comprising a different number of pulses at each station and different numbers of pulses for the control code and the control code of the particular station considered; each transceiver comprising a master relay which occupies a first position when the transceiver group performs transmission and a second position when this group performs reception, a counter relay chain for producing the pulses, and a stop relay of the ocde which, when energized, stops the encoding action of the count relay chain;

   the central station also comprising a selector relay for each station, this selector relay being actuated during the first part of the codes between the central station and the particular station considered, a means for synchronizing the stopping of the coding action of the transmitter -receiver of the central station, at the end of a code, with the stop of the similar coding action of the transceiver of said station, regardless of the length of the second part of the code;

   said means comprising a circuit, in parallel with the control circuit of a particular relay of said counting chain which corresponds to the desired final pulse, this circuit of the synchronization means comprising a contact in the controlled position of another control relay. said counting chain, one row ahead of said particular relay, a contact in the commanded position of said selector relay for said particular station, a contact in the first or second position of the master-relay of said transceiver of the central station depending on whether the code is a cade, command or control, and the winding of said code stop relay to said central station transceiver,

   whereby said code stop relay at the central station is energized during the final pulse of any code from said particular station and the coding action of the central station ceases together with that of the station.


    

Claims (1)

2) Control installation, according to claim 1, characterized in that it comprises a central station and several stations connected by a line circuit, the central station being equipped with a transceiver to send control codes to stations and to receive control codes therefrom, said control codes serving to control the position of certain devices of the stations, and the control codes serving to represent at the central station the position of said devices, each code comprising a first part composed of several pulses forming a call sign to select the desired station or the appropriate central station display panel, <Desc / Clms Page number 63> and a second part composed of several pulses to control the said devices or indicate their position, the number of pulses in the second part being different for each station; said code transceiver comprising a selector relay for each station, a count relay chain, a code stop relay and a master relay, said chain operating to record said code pulses until said operation terminates in response to the operation of said code stop relay; means for terminating the codes of any station on any desired even-order pulse determined by the number of pulses required for transmission or reception for said any station; said means comprising a repeater of the marten-relay capable of passing to a first position during the command codes and biased towards a second position at any other time, and adjustable circuits for passing the stop relay from the code to its commanded position in order to complete the coding action, said circuits comprising a commanded position contact of a relay of said counting chain immediately ahead of said desired pulse, a commanded position contact of the selector relay of said station, and a contact of the relay master repeater in a first or a second position depending on whether the code to be terminated is a command or control code., whereby the operation of said transceiver is terminated at the same time as that of said any station. 30) Control installation according to claim 1, characterized in that it comprises a central station and several stations connected by a line circuit, a code receiver, to the central station, capable of receiving stations of the selective codes intended in indicating the condition of certain devices of said stations, each code comprising a first part composed of several pulses forming a distinctive call sign for a particular station, and a second part composed of several pulses so as to constitute the control indications concerning said particular station designated in the first part, the second part comprising a different number of pulses for each station; code receiver comprises a chain of counting relays which operates on a sufficient number of pulses to receive the code from any of the stations regardless of the length of the code, the central station also comprising a number of selector relays, each of which represents a station, each of these relays being energized to occupy an operating position only when the first part of a particular code includes the in- EMI63.1 dicative, c41Dl of. the stat} .oLr: eptés19até: i:) (pà: c: tet! 1it :: xéIàis. ,, slgetur "., r, xanwyen to synchronize the termination of the encoding action of said receiver with the termination of the encoding action of any one of said stations so as to be able to correctly reset the installation , said means comprising a code stop relay, which is energized during a final pulse of any of the codes received by the receiver so as to stop the coding action, and a plurality of circuits each corresponding to a station, each of these circuits being intended to energize said code stop relay in parallel with a particular relay of the counting chain which corresponds to said final pulse coming from the station that said circuit represents; each of these circuits comerting, in said portion in parallel, a contact in the controlled position of the counting chain relay immediately preceding said particular relay considered, and a contact in the controlled position of said selector relay which is energized during the first part of the code coming from the station that said circuit represents. 4) Control installation according to claim 1, charac- EMI63.2 ized by the fact that it includes at the central station a transmitter.: ;;;., receiver comprising a chain of counting relays that can operate on a <Desc / Clms Page number 64> sufficient number of pulses to provide the appropriate number of pulses suitable for the code to be sent or received to or from any station, the central station further comprising a station selector relay assigned to each station. station, a particular selector relay being energized to close its contacts in their commanded position, during the first part of a particular code, only when the call sign of a particular station, to which the selector relay is assigned considered is included in said particular code; means for enabling the central station to terminate the encoding action of said transceiver during said particular code on a final pulse required or transmitted by said particular station, regardless of the length of the second part to said particular coae; said means comprising a code stop relay which, when energized, stops the encoding action of the transceiver, a repeater of the master relay which occupies a first position only during any command code and a second position at any other time, and circuits for energizing said code stop relay in parallel with a counting chain relay which corresponds to the final pulse of said particular code, a particular circuit comprising, in the part in parallel with said relay of the counting chain, a contact in the controlled position of another counting chain relay immediately preceding said counting chain relay in the order of operation, a contact of said repeater of the master relay, which contact is in a first or second position following that said particular code is a command or control code, a contact in the commanded position of said particular selector relay energized during the first part of said particular code, and the winding of said stop relay of the code, whereby the latter is energized during the final pulse of said particular code to stop the encoding action of the transceiver and allow the remote control facility to properly return to zero. 4) Control installation according to claim 1, characterized in that it comprises means for allowing the transceiver of the central station to complete its coding action during any code on the appropriate pulse corresponding to the last pulse required by a particular station and selected by the first part of this codes said means comprising a code stop relay, a repeater of the master-relay, which occupies a first position during the command coaes and a second position during the codes of control, a station selector relay for each station, a particular station selector relay only passing to a first position during the first part of the codes when its distinctive code is included in this first part, and a circuit for energizing the code stop relay and thereby terminating the coding action, said circuit comprising a contact in the first position of a particular station selector relay, and a contact in the first or second position, of said next repeater that the code to be terminated is a command or control code. 6) Control installation according to claim 1, characterized in that it comprises at the central station a transceiver comprising a chain of counting relays, time relays, a master relay and selector relays associated with it. ci at the rate of one relay for each station; a means for ensuring that the operation of this transceiver is terminated on the final pulse of the code received, said means comprising, first of all a repeater relay of the master relay, energized or not energized depending on whether the transceiver is transmitting or receives., and on the other hand a circuit, to supply current to a final stop relay. of the parallel counting chain with a relay corresponding to the pulse on which the code ends, said circuit are closed with @, <Desc / Clms Page number 65> the contacts in the energized position of one of the time relays, a chain relay ae counting in advance of said specified relay, said selector relay for said particular station., and a contact in the non-energized position of said repeater relay of the master-relay, whereby the coded operation of the transceiver ends together with the final pulse of the received code. 7) Control installation according to claim 1, charac- terized in that it comprises a transceiver at the central station, each code transmitted by a station comprising a first part made up of several pulses forming a call sign. distinctive of the station, and a second part composed of several pulses indicating the position or condition of several devices of the particular station considered, a long pulse indicating a positive condition of a device, the second part being divided into several groups of pulses, each of which has the same length as the first part; the transceiver at the central station comprising a chain of counting relays for receiving the code, this chain being able to receive all the groups of pulses of the second part of the code; transceiver also comprising a group of intermediate recording relays for temporarily storing the positive indications received during each group of pulses in order to deliver, during a final pulse of each group of pulses, a positive indication making switch a corresponding intermediate recording relay to the commanded position; a means for resetting the intermediate register relays at the end of each group of pulses during the second part of the code, whereby these relays can be used again during a subsequent group of pulses to further temporarily store the positive indications received, said means comprising a record reset relay normally occupying a first position and switching to a second position during the first pulse of the second group and of each subsequent group of pulses during the second part of the code, this relay Summer resetting the recording being brought back to its first position during the first long pulse of the corresponding group of pulses; said means further comprises a hold circuit for each intermediate recording relay, each such circuit being closed when the corresponding intermediate recording relay is operating in response to receipt of a positive indication if said reset-relay to record zero occupies said first position, and all lite: hold circuits being open in response to passing said record reset relay to its second position, thereby returning said intermediate record relays to their uncontrolled position at the end of each pulse group during the second part of the code. 8) Control installation according to claim 1, characterized in that it comprises a code ae receiver capable of being connected to a line circuit to receive from a remote station a code indicating the position or condition of different devices the code comprising a first part composed of several pulses forming a distinctive call sign of said station, and a second part composed of several pulses representing said indications, an indication being assigned to each pulse, a positive indication being determined by a pulse long, the pulses ae the second part of the code being more numerous than those of the first part and being divided into groups each having a length equal to that of the first part; said receiver comprising a counting relay chain, capable of receiving said entire code, and a group of intermediate recording relays for temporarily storing said positive indications during each group of pulses, each <Desc / Clms Page number 66> intermediate recording relay passing to a storage position in response to a positive indication provided by a corresponding relay of said count chain; a recording reset relay, which normally occupies a first position; to which it is requested and which can occupy a second position in response to the operation of each relay of said counting chain which operates by pushing the first pulse of any one of said pulse groups, and a holding circuit for maintaining each intermediate relay record in said storage position, each holding circuit being closed when said record reset relay occupies its first position and being open in response to the relay occupying its second position thereby resetting all relays recording intermediates at the end of each group of pulses and during the second part of the code. 90) Control installation according to claim 1, characterized in that it comprises a transceiver at the central station, comprising one or more counting relay chains capable of receiving codes of different lengths from each of the stations, these codes being divided into a group of pulses having the same length and a group of intermediate recording relays to temporarily store the indications received during the second and subsequent groups of pulses transmitted by said stations, before final delivery to a selected group of central station control relays; means for allowing the said group of recording intermediate relays to be used again during each subsequent group of pulses, said means comprising a recording reset relay and a hold circuit for each intermediate recording relay said reset relay occupying a first position when it is not energized and a second position when it is energized, this relay being energized at the start of each of said subsequent groups of pulses during which said indications are received from the station, each intermediate recording relay holding circuit comprising a contact in the first position of the recording reset relay, whereby the holding circuits are interrupted and the intermediate recording relays are reset after the end of the second group and each of the subsequent groups of pulses. 10) Control installation, according to claim 1, characterized in that it comprises a code receiver at a central station, this receiver receiving at certain times by a line circuit a code of any one of a certain number of stations each code comprising a first part consisting of a first group of an even number of pulses arranged to form a distinctive call sign of a particular station, and a second part consisting of a second group and subsequent groups of pulses, each of these groups having the same length as the first group, this second part indicating the position or state of certain devices placed at said station, a long pulse constituting a positive indication for a device corresponding to this impulse, said receiver comprising a line relay, which occupies an inverse position during odd code pulses and a normal position during even pulses, a time relay chain comprising a first relay and a second relay which each normally occupy a position of excitation during the code and which fall respectively during the long pulses ae odd rank and even rank, a relay chain ae counting used to receive the code and capable of receiving all the groups of pulses during a particular code, and a group of Intermediate recording relays for temporarily storing positive pulses during the second group and subgroups <Desc / Clms Page number 67> pulse sequences, a positive indication passing an intermediate recording relay corresponding to a commanded position; a relay ae resetting the recording, which normally occupies a first position and which occupies a second position when it is energized; an excitation circuit intended for the reset relay and comprising a contact in reverse position to said line relay as well as contacts, in controlled position and in parallel, of the various counting chain relays which are controlled on the last pulse of the second group and each of the subsequent groups of pulses, so as to energize said relay ae resetting the recording to zero at the start of each subsequent group of pulses; a hold circuit; for this relay, comprising contacts in the energized position and in series with the first and second time relays, to maintain said record reset relay in its second position until a positive indication is received ; a holding circuit, for each intermediate recording relay, comprising a contact in the first position of the relay ae resetting the recording, whereby each intermediate recording relay occupying its commanded position is reset after the end of the second group and of each of the subsequent groups of pulses, so that the group of intermediate recording relays can be used again during each of the subsequent groups of pulses to temporarily store again the positive indications received. 11) Control installation, according to claim 1, characterized in that it comprises at the central station a transceiver comprising a master relay which occupies a first position during each control code and a second position during each control code ., a count relay chain, in which is included a code stop relay., for producing multiple pulses while transmitting or receiving the codes, said code stop relay stopping the coding action of the chain. counting when energized, a chain of time relays, a group of selector relays providing a selector relay for each station, the selector relay of said particular station being energized and occupying its commanded position during the first part of the command and control coaes transmitted to said particular station or transmitted by the latter. a repeater relay of the master-relay, respectively occupying a first and a second position during the command and control codes, and circuits for energizing the stop relay of the coae during a final pulse for the codes transmitted to said particular station or emitted by the latter, each of these circuits comprising a contact closed during the coding action by one of the timing relays, a contact in the controlled position of a relay of a primary counting chain actuated during the preceding pulse immediately the final impulse, a contact in the controlled position of said selector relay for said particular station, a contact of said repeater relay, in the first or second position depending on whether the code is a command or control code, and finally the winding of the code stop relay whereby the coding action of the central station transceiver is stopped during the necessary final pulse of either code for said particular station and the reset action is synchronized to the central station and at said station. 12) Control installation according to claim 1, characterized in that it comprises a code receiver at a station, this receiver being able to receive the codes from a central station via a line circuit, each code comprising a first series of pulses for selecting a particular station and a second series of pulses for controlling certain devices of this station, this receiver comprising a line relay which can pass alternately <Desc / Clms Page number 68> at a normal position and at a reverse position at selected time intervals, a chain of timing relays comprising a first relay and a second relay controlled by the line relay, the first time delay relay falling if the line relay remains in the reverse position and the second time delay relay returning to rest if the line relay remains in the normal position for a time greater than a predetermined time interval, for example the duration of a pulse length of the code, a chain of counting relays, and a station selector relay which is energized when said station is selected during the first series of pulses; a first and a second station selection and function registration relay, a first excitation circuit for each of these relays in order to energize said relays during the first series of pulses, respectively on the first and the second pulse Long, each first excitation circuit comprising a contact closed by the chain of time relays, during any coding action, a rest contact of one of the time relays, and a work contact of the chain of counting relays corresponding to the pulse during which said relay is to be energized, a first hold circuit for each relay to select and store, each first holding circuit comprising said contact closed by the chain of timed relays and a contact in the non-energized position of said station selector relay, a second excitation circuit, for the first selection and recording relay, comprising a closed contact of the first time relay, a second excitation circuit, for the second selection and registration relay, comprising a closed contact of the second time delay relay, a second holding circuit, for the first selection and registration relay, comprising a normal contact of the line relay and a closed contact of the station selector relay, and a second holding circuit for the second selection and recording relay comprising a reverse contact of the line relay and a closed contact of the station selector relay. station, whereby the station selection and function registration relays effect selection of said particular station during the first series of pulses and register the character of the alternating pulses during the second series of pulses. 13) Control installation, according to claim 1, characterized in that it comprises a central station and several stations connected by a line circuit, this central station being able to transmit by the line circuit a code of relatively short elements or long lines comprising a first group of pulses for selecting a particular station and a second group of pulses for controlling certain devices at said station, the latter comprising a line relay which can be placed alternately in a normal position and in a reverse position in response to successive code pulses, a chain of counting relays, a first and a second time delay relays energized during the code and falling respectively to rest when the line relay changes to its reverse or normal position during long pulses, and a station selector relay energized during the first group of pulses when said particular station is selected; a first and a second station selection and function registration relay, a first and a second driving circuit, a first and a second holding circuit for each selection and registration relay, each first circuit excitation comprising a closed contact of one of the time relays and a closed contact during operation of the count relay chain, the second excitation circuits, for the first and the second selection and registration relays, comprising respectively a rest contact of the first time delay relay and a rest contact of the second time delay relay each first holding circuit comprising a rest contact of the station selector relay, and <Desc / Clms Page number 69> the second holding circuits of the first and second selection and recording relays comprising a station selector work contact and respectively a normal contact and a reverse contact of the line relay. 14) Control installation according to claim 1, characterized in that it comprises a central station and several stations connected by a line circuit, each code transmitted by the central station comprising a first part consisting of several pulses, of which . three are long, to select a particular station, and a second part composed of several pulses to control certain devices of the station; a line relay which can switch alternately in the normal position and in the reverse position in response to successive elements of the code, a chain of counting relays comprising contacts that close successively, one at a time, to count the im- successive pulses of the code, a chain of time relays comprising a first and a second time relay, which are normally energized during the coding action and which drop out respectively when the line relay remains in the reverse or normal position for a time greater than one determined value, for example the duration of long pulses; a station selector relay energized during the third long pulse of the first part of the code if said particular station is selected, a first and a second station selector and function registration relay, a first excitation circuit, for each selection and registration relays, serving to energize said relays respectively during the first and second pulses, long of the first part of the code, each first excitation circuit comprising a contact closed during the coding action by the chain of timer relays, a normally-open contact of one of the timer relays and a closed counting chain contact during the corresponding pulse; a first holding circuit, for each selection and registration relay, comprising said contact closed by the timing chain, a rest contact of the station selector relay and a work contact of the selection and registration relay; a second excitation circuit, for each selection and recording relay, intended to energize said relays during the alternating pulses of the second part of the code when these long pulses, each second excitation circuit comprising said contact closed by the chain timing and respectively, a rest contact of the first and second timing relays; a second holding circuit, for each selection and recording relay, intended to keep said relays energized during the following pulse, each second holding circuit comprising a work contact of said selection and recording relay, a work contact of the station selector relay, and is effectively a normal or reverse contact of the line relay, whereby the station selection and function registration relays actually act during the first part of the code to register the selection of said particular station , and effectively acting during the second part of the code to record the long or short character of said pulses in order to appropriately control the devices of that particular station. 15) Control installation according to claim 1, characterized in that it comprises a code receiver at a particular station, this receiver being able to receive from the central station relatively long and short element codes, each code comprising a first re part composed of several pulses, including three long pulses, to select said particular station, and a second part composed of several pulses to control certain devices of these stations; the receiver including a line relay that can occupy <Desc / Clms Page number 70> alternately two positions in response to successive pulses to the code, a timing chain comprising relays at rest during said long pulses, a counting chain, and a station selector relay energized during the third long pulse of the first part of the code when said station is selected; two relays for station selection and function registration, a means for energizing these two relays successively and respectively during the first and second long pulses of the first part of the code, these relays, when they are successively energized, can actually control energizing the station selector relay on the third long pulse, said means comprising circuits acting efficiently during said first part and completed by said counting chain and by the fall of one of the time relays, and completed holding circuits by rest contacts of the station selector relay; another means for alternately energizing the selection and recording relays on odd pulses and even pulses during the second part of the code, when these pulses are long, and for keeping them energized during the following pulse, this other means comprising circuits effectively acting during the second part of the code and closed by the fall of one of the time delay relays, and holding circuits controlled by the line relay and completed by work contacts to said selector relay, whereby the station selection and function registration relays effectively act during the first part of the code to determine the station selection and during the second part of the code to register the character of the control functions received at said particular station. in appendix 10 drawings.