US1888985A - Selective signaling system - Google Patents

Description

Nov. 29, 1932.

H.E.HERSHEY SELECTIVE S IGNALNG SYSTEM Original Filed Nov. 28. 1927 2 Sheets-Sheet l NOV., 29g Hv E, HERSHEY SELECTIVE SIGNALING SYSTEM Original Filed Nov. 28. 1927 2 Sheets-Sheet 2 RTM-LTE Harm- E. Harel-LEB Ill'l Patented Nov. 29, 1932 6pasrren STATE-s rnrenr crates nanna a. Hansis-Er, 'or can rank, iLLrNors, AssmNoa, an missin nssrennnn're, ro

Associarsi) arrecare Lanonamomns, ING., or cursado, rumors, .a marcan- TION @E DELAWARE sELEcT-rvu sminuire svsriras rig'lna application led November 28,192.7, Serial lilo. 233,361. this application -February 15, 193e.,

'application is a division,' have been evised heretofore andemployed in train dispatching l systems, remote control s'yster'ns, and other systems. Examples of such remote control systems are shown in Patent Numbers 1,613,- 944 and 1,709,067 issued to Joseph C. Field, and Patent No. 1,711,672 issued -to LeslieE.

oon.

lin those remote control systems', a plurality of selector switches are controlled over a, common line from a central control station. All

of the selector switches are operated simul' taneously by impulses transmitted over the common line, but only'one of the selector switches comes to rest in a circuit closing position at the completion of the transmissmn of the three series of impulses.

The selector-switches used in the aforementioned patents are the type `disclosed in Patent No. 1,343,256, issued to J.'C.,Field which are capable of controlling a mazrimumnu'mber of four circuits. However, in remote control systems it is veryfrequently desirable to close many morethan four circuits at one point, that is, at one substation. In'such instances, it is necessary to provide more than one selector switch of the type disclosed in the Field Patent No. 1,343,256, the number of these selectors employed being dependent upon the number of circuits that must be closed at the substation. When this number is comparatively large, the system employing va large number of such switches necessarily loses its essential simplicity and becomes undesirable. v

. Therefore., Ihave assumed as the principal object omy invention the provision of a selector switch capable of closing a. great many more circuits than the Field selector in systems wherein a plurality of such selectors are controlled over a common line by -alternating current impulses. i

serial No. leases.

Further ooiectsy of my invention, not spe- A cically mentioned here will be apparent *from a reading of the detailed description and claims whichiollow. i

The drawings comprising Figs. 1 and 2, when arranged with Fig. 2 above Fig. l with correspondingly numbered lines, in alignment, show sufficient details to enable a clear l understandmg of Inyinvention.

Referring new to Fig. 1 in more detail l show there the sender S,-and associate equipment located at the dispatchers or sending station. The sender S comprises the impulse generator 13, whichvis constantly mov ing the stepping switch comprising motor magnet 12 and wipers 52 to 55, inclusive, the switch being in one embodiment ot mine, a rotary lineswitch mechanism such .as is come monly used in automatic telephone systems.

*'.lhe sender also comprises the relays 1 to 9, `inclusive, which are operated to control the sender in the trans-mission of all signals. ln

' the lower part of Figi, and within the dotted square B, 1 show the keys K1 and K2, each with its associated. individual relay. The operation of one of these keys, energizes the individual relay to strap the banks oit the sender switch in such a manner as to cause the sender to send out the code of impulses necessaryto selectthe particular device associated with that key. The key K3 is a representation of the train dispatching key shown in Brown Patent No. 1,155,640, that key being shown to illustrate that the sender S and the Brown key may be inten changed and either used to control the sem lecting switches. Leading out from the senda ing station are thetrunk conductors 60 and 6l, those conductors leading to all of the stations in multiple. lBridged across this trunk is an ordinary magneto local battery tele-1 phone, not shown, through which telephone conversations may be carried on with a se-a lected one of the substations.

In Fig. 2, l show a substation comprising the train dispatching selector 171, which is of the type shown in the aforementioned Field APatent No. 1,343,256, that substation being bridged across the line conductors 60 and 61.

'zel

, commonly employed in automatic telephone systems. yAssociated with the Aselector `\V is the polarized pulsing relay 113, whichis bridged across the line conductors, and operated in response to the alternating current impulses sent over the. line by the sender to position the switch lV upon a set of contacts in accordance with the code of impulses transmitted. Relays 101 to 107 arc employed to control the selector switch in a manner which will be brought out hereinafter. rlthe selector switch, upon being operated, operates relays in the group comprising relays 108 to 112, inclusive, energizing a combination of those relays to close a circuit to a particular device. These devices, which may be the call bells of a train dispatching system, the circuit breakers of a remote control system, the semaphore of a train signaling system, or any electromagnetic device, are represented by the squares 169 and 170. lt is immaterial to the operation of the present invention just what the character of these devices is, since the present vinvention is concerned merely .with selecting of a particular device and the closing of a local circuit'thereto.

The terminals in the bank over which wiper 14() of the selector W and wipers 53 and 54 of the sender S' move are connected t-o terminal blocks, indicated by a lrow of smal'l circles on the drawings. Each of these blocks will contain a contact for each contact in the bank, and by means of jumper wires cross connected from these contacts to the terminals of the selecting relays and the individual relays in the sending station, the sender can be made to transmit any combination of impulses desired, and the selector can be made responsive to any combination of impulses. The sender shown in the drawings, and the selector shown in the drawings, are arranged to be responsive to a 27 digit code, that is, the signal will comprise 27 impulses. These drawings are made by way of example only,

as both the sender and the selector are capable of being made responsive to any number of lmpulses as may be required. 'llhe 27 impulse code was selected because that is the code most generally used by the train dispatching system employing the devices mentioned 1n the aforementioned patents, that particular code being selected to illustratethe interchangeability of the sender and selector of this invention with the sender and selector mentioned in those patents.

lln lFig. 1, il show the battery B1, which is connected to the trunk line 60 and 61, andr which is reversed by an impulsing relay to generate impulses of alternating current in the trunk line. This battery, is preferably patents.

aeeaeee of about one hundred volts potential, the particularbattery vshown may be replaced by connections to a 110 volt direct current power supply. Throughout the drawings I have connected the positive line, terminal of battery to a symbol comprising a positive sign enclosed in-a circle. This symbol is to re resent a busbar, extending throughout t e particular station, that bus bar may be connected to ground. Throughout the drawings l have shown 4a plurality of bus bars, and batteries to avoid an unnecessary complication of the drawings. In an actual installation there would be -but one battery to each station, preferably a storage battery of about 50 volts potential.

rll`he drawings illustrate an adaptation of my invention to an existing selecting system, either a train dispatching system or a remote control system employing the key sender and selector mentioned' in the foregoing system at a point where it is desired to close rlhe selector W, is installed on the a relatively large number of circuits, that being the adaptation to which my selector is best adapted.

To illustrate the operation of the invention,

assume that the dispatcher desires to call the station associated with the ley K2, and that the code of that station -is 7-7f13. The dispatcher presses the key K2, to lock up the relay 11, which at armatures 42 and 43 prepares thecircuit through conductors 70 and 1 to the banks of the sender switch, arrang? ing the sender to transmit the digits 7 7-13.

The constantly moving impulse generator 13 operates to transmit impulses, and when the key K2 is thrown, starts the counting switch in `operation b `energizing the magnet 12. After the switc has taken one full step and moved the wiper 52 into engagement with the multipled ones of its bank contacts, relay 1 is alternately energized and deenergized as the motor magnet 12 operates. When the rela 1 is energized, it reverses the polarity of t e trunk conductors 61 and 62, thereby transmitting one impulse which operates the motor magnets of the selectors such as motor magnet 113 and the motor magnet of the selector 171 which are bridged across the trunk. When the relay 1 deenergizes, it again reverses the polarity ot the trunk to transmit another impulse. When seven impulses have been transmitted, the relay 1 comes to rest, in this case it comes to rest in an energized position, that control being exercised b the relay 6, associated with the sender S.- ince the station 171 is not the station preselected by the digits 7-7-13, when that selector comes to rest the retaining pin will not be in the proper position, and the selector will rotate back and return to normal. While the relay 1 is maintained in its energized position, the sender switch S takes two steps, those Steps being taken to put a pause in the imvice, the irst pause, ywith the wiper 140 upon Y its seventh bank contact energizes the relay 109, to prepares. point in an operating circuit. It may happen that the switch W has access to a plurality of devices whose first digit isa 7 in which case either the second or theA third digits Vor both are necessary to select a particular one of these devices. The energization, the operation ot' the selector switch W tion of the relay 109 therefore closesa circuit to the common bus bar 167, which is conf nected to a plurality of devices, all of whose numbers begin with a 7. When the sender has taken the two steps, impulsing is resumed,

and additional impulses comprising the second digit, in this case a 7, are'transmitted.v Theswitch 171 will againbe stepped, but since it is not set to respond to the 7 it-will again restore to normal at the end of the impulsing. It the switch W was not set to respond to a 7, when the irst 7 was transmitted,

the wipers of that switch would come to rest upon such contacts that wiper 140 would pick up direct positive potential, and the relay 107 would be energized to open the circuit of the motor magnet of switch W, to prevent its responding to any moredigits. Thus it will be seen that responsive to the transmission of a 7, all of the switches of the type shown in the Field patent will be stepped, and all of the switches similar to W will be set. At the end of the transmissionof the digit 7, the Field switches will' return to normal, and the switches W which are not set tothe digit `7 will' be locked out and made unresponsive to 1 further impulses of the present signal.

When the second 7 has been transmitted andthe impulsing ceases momentarily, the selecting switch W is standing on its 14th bank contact to close a circuit to the relay 111, which relay energizes and prepares a point in the circuit of device 169. The vsender takes two more steps without transmitting any further impulses to the line, at the end of which time thelast series of impulses in the signal is transmitted. In this case the last series comprises 13- impulses. When the 13 im# pulses have been delivered, wiper 139 engages the contact to which the relay 108 is connected, energizing that relay to close the last point in the circuit of device 169. The device operates over this circuit. In the sending station the completion of the sending of the 13 impulses brought the wiper 53 into er.- gagementwith itseighteenth bank contact, thereby completing the circuit -for the relay 6 which energizes to maintain the impulsing relay 1 energized to prevent transmission of further impulses. T hesender switch S continues to' step, taking '6 steps tobrin 1ts wipersinto engagement with the norma positlon contacts, at which time the relay 1 1s deenergized to transmit 4a single impulse of current over the trunk line. This single impulse serves as a clearing outimpulse, operatv ing the switch W to restore it to normal under' the control of the localcircuit completed to wiper 138, and operating the Field type of selectors which lrestore to normal. under the control of a restorin spring. ith the sender and selecting switches in their'normal positions, the system is at normal in readiness for the ytransmission of the next signal.-

If the key K3/is operated to select the staand of the way station selector 171 is `the .same as before, the sender S is not operated.

The key KS sends out a code oit 27 impulses, which operates the relay 1 to transmit impulses to the'trunk conductors. This code of 27 impulses is split into three groups 'by a mechanical' arrangement in the key which can behest understood from the late'nt No.

Having thus described my invention in general, l will now proceed with a detailed description of its operation.l

Sem/ng code 7--7--13 Assume now that the dispatcher desires to operate the device whose code is 7-7-13. To do this he operates the key K2, thereby closing a circuit from positive battery through springs 37, conductors 67, to the upper pair of contacts of the key K2, conductor 68, normal position and wiper 55, through the winding of relay 8 tov negative battery.

leov

Relay 8 energizes over this circuit and. at

springs 35 opens the normally closed circuit (intending from negative battery through re` slstance 56 and? conductor 81, through the winding of the impulse generator 13 to posiy tive; and closes a substitute circuit therefor from negative battery through spring 35 and its make Contact, through the winding of the motor magnet 12, the conductor 81, land the winding of impulse vgenerator 13to positive. It will be well to note that the impulse generator is operating constantl'y,vthrough the circuit including' the resistance 56 whenever the sender is normal. When the impulse'genera-tor energizes, springs 44 close and the circuit'of the magnet 13 is shunted out. rIhe `switch whose wipers are advancedy when the .magnet deenergizes rather than when it energizes. The energization of magnet 12 opens at'springs 34 a point in the vcircuit of v impulsing relay 1, without particular eiect. at this time since that circuit is held open at wiper 52. Magnet 12 also closes springs 31, which elosureis likewise. without effect at this time. When the impulse generator 13 opens the springs 44 and cuts the resistance of its magnet back in series with the magnet 12, the latter magnetA deenergizes, advancing the wipers 52 to 55, inclusive, one step into engagement with their first working bank contacts. Returning now to the opera-tion of key K2, it' closes the. obvious circuit from the positive potential on conductor 67 through the lower key springs through the winding of relay 11 to negative battery. energizing" that relay. When the wiper 55 is moved out of its normal position and into engagement with the first working contact of its banks, as explained above, it closes a circuit from positive battery through relay 9, through the multiple contacts engaged by wiper 55, and thence over two paths in parallel., the one through springs 39, and the relay 11 to negative battery, and the other through the relay 8 to negative battery. Relay 9 energizes over this circuit, and relays 8 and 11 are maintained energized.v The energization ot relay 9, at springs 37, disconnects the posiy tive potential from the conductor 67 to render the pressing of any other keys ineffective. At springs 36 relay 9 prepares a point in the control circuit. for a purpose which will be apparent hereinafter.

The energization ot relav 11 at springs 42 closes a circuit from positive battery over conductor 70 through the cross connecting blocks and jumper 77 to the tenth bank contact engaged bv the wiper 54, thereby preparing a control circuit which will be completcd when the wiper 54 engages its tenth bank contact. Similarly at springs 43. relay 11 places positive potential on conductor 71, to prepare a circuit through the jumper 78 and the terminal block pins, conductor 74 thence to the fourth working bank -contact over which wiper 53 rotates, to prepare a control circuit which will be completed when wiper 52 engages that contact.

Imp/liking' As soon as the switch is moved into engagement with its first working contact, as the, magnet 12 restores, a circuit is completed trom positive battery through the' multiple contacts engaged by the wiper 52, through springs 34, springs 30, conductor 62.. through the winding of the relay 1 to negative battery, energizing that relay.- The energization of relay 1 operates springs 20 and 21 to reverse i the polarity of battery placed on conductors 60 and 61, thereby transmitting the first impulse tothe switches at the substation. Magnet 12 soon energizes, responsive to the operation of springs 44, and at springs 34 opens a point in the circuit .of relay 1, permitting that relay to deenergize and again reverse the polarity of the battery on trunk conductors 60 and 61, to transmit the second impulse; When the springs 44 again open, the magnet 12 dcenergizes, the wipers 52 to 55 are advanced one step into engagement with their second working bank contact, and the circuit of relay 1 is again closed at springs 34 to energize that relay to transmit the third impulse to the trunk conductors. This process continues until wiper53 enters into engagement with itsl fourth bank contact to which 7 4 is connected. When the wiper moves into engagement with that contact, magnet 12 is deenergized and springs 34 closed to reenergize the relay 1 to transmit the 7th impulse to the line conductors. Simultaneously with the energization of relay 1, relay 6. is energized over a circuit traceable from positive battery through springs 43 and thel conductor 71, jumper 78, conductor 74, wiper 53, conductor 66. through the winding of relay 6 to negative battery. Relay 6 upon energizing at springs 26 closes a circuit from positive battery through conductor 62 and the winding ofrelay 1 to negative battery, to maintain the relay 1 energized independent of the springs 34. Relayi 6 at springs 28 locks itself through springs 29 and springs 36 to positive battery over a circuit independent of the wiper 53. At springs 27. relay 6 prepares After the energization of relay 6 at the end of the transmission of seven impulses to the trunk conductors 60 and 61. the motor mag net 12 again energizes. closing at springs 31 a circuit traceable from positive battery through springs 27, conductor 65, springs 31, conductor 64. spring 23 and its break contact, through lthe winding of relay 2 to negative battery. Relay 2 energizes over this circuit, and at springs 22 prepares a point in the circuit of relay 3. Relay 3 at this present moment is short circuited, having positive potential put on its upper terminal through springs 22, and having positive potential put upon its lower terminal through springs 36 and 29. When the springs 44 of the impulse generator open and permit the magnet 12 to deenergize springs 31 are opened and positive battery is removed from springs 22 of the relay 2, thereby permitting the relay 3 to energize over a circuit traceable from the positive battery previously. traced to the lower terminal relay 3, through the winding relay 3, springs 22, through the winding of re1ay'2 to'negative battery. The relay 2 is Y 4, that circuit being completed when the magnet 12 again energizes preparatory to taking another step. The circuit for the relay 4 is the same as for the circuit for the relay 2, up to the spring 23 which is now against its make contact, the circuit extending through spring and the winding of the relay 4 to negative battery, Relay l ener gizes, and at springs 24 prepares a point in the circuit of relay 5, which relay is at the moment short circuited by having positive potential put on its upper terminal through the springs 2i and positive potential puth on its lower terminals through the springs 27. When the magnet 12 again deenergizes, to advance the Wipers 52 to 55 into engagement with their sixth working contacts, vsprings 3l are operated to' remove the positive potentialfrom springs 24, thereby permitting relay 5 to energize in a circu1t inseries with the relay e, which circuit maintains the relay l in its energized position. 'llhe energization ofrelay 5, opens at sprin s29 the locking circuit o the relay 6, permitting that relay to fall hack and at springs 27 open the circuit over which relays e and 5 were energized and held, opening of springs 29 opens the loclr ing circuit oir relays 2 and 3, Thus, the relays 2 to 3, inclusive, are permitted to restore to their normal positions. Relay t5 in restorin to its normal position, also opens the locking circuit of relay l at springs 26:.` However, since the magnetvl2 is in its normal position when the relay 6 restores, relay l does not immediately fall back, being maintained over the Vcircuit through springs Si and the Wiper 52.

sending ai@ @ma erga Magnet l2 again energizes, and at springs deepens the circuit of relay l permitting that relay to fall hack to transmit the'iirst impulse of the second series. When the magnet 12 deenergizes, to advance the wipers 52 to into engagement with their respective seventh workin contacts, springs -34 are again closed an relayl energized to trans#v mit the second impulse of the second series.

rl`his operation continues, 'until the WipersV times to transmit six impulses to they line.

Since the relay 1 was energized during theprevious pause period and deenergized when the magnet 12 was energized, the relay transmitted an extra impulse, making 7 in all, so that when the wipers are resting upon the tenth contact, 7 impulses will have been transmitted over the trunk. At this time a circuit may be traced from positive battery to springs 42, conductor 70, the jumper 77, to

the tenth bank Contact engaged by Wiper 53, through the winding of relay 7 to negative battery, energizing the relay 7'. Relay 7 at -springs 30, opens a point in the circuit ofrelay l, to prevent that relay energizing at this time. At springs 32, relay 7 places positivebattery on conductor 65 to prepare the lcircuit for relays 2 to 5, inclusive. At springs 33, relay 7 locks itself to positive independent of wiper 74. Motor magnet 12 is again ener ized, and the springs 31 close -a circuit fort e relay 2 as before, energizing that relay which prepares a circuit for the relay 3. vWhen the magnet deenergizes and advances the wipers into engagement with the eleventh bank contact, relays 2 and 3 are energized and maintained through the springs 36 and 29 as before. The magnet 12 reenergizes preparatory to advancing wipers into engagement with the twelfth bank contact. 'l'.he reenergization of magnet 12 prepares a circuit for the relay 4 as before and when the magnet deeiiergizes relay 5 energizes to unlock relays 2, 3 and 7, which back immediately. The restoration of relay 7 unlocks relayed and 5, and at springs 56 closes circuit of relay l which immediately energizes to transmit an impulse over trunk conductors. Y

Transmitzng the laat vZigiz? vllhe magnet l2 and the relay l. alter nately energized and deenergized as until the wiper 53. engages its eighteenth loankcontact, at which time twelve impulses will have beenv transmitted over the trunk by the relay l. When the wiper 53 moves into engagement with the eighteenth bank contact, thepreviously traced circuit for re- SillV lay 6 is closed, energizing that relay. at

springs 26 relay (i closes a circiiit for relay 1 to energizethat relay if it has not yet energized or to maintain already in its energized position. vRelay l. energizes to transmit the thirteenth or last impulse of the code. livered by the impulse generator i3 to the motor magnet l2 operates that ma et and the relay 2 as before, the magnet railing back to advance the wipers at the end oflthe step.

and the relay 2 completing the circuit of therelay 3 which energizes when the magnet deenergizes as before. The next step energiaes the magnets 4 and 5 as before, however, the circuit of relay 6 is notopened-as befpre because thev wiper 5,3V still engages positive potential, Themagnet is energized siii times toadvance' wipers 52 and 53 into their home The next impulse cle-- it energized if it is iso' e neeaeee net 12 from the circuit of the impulse gen# erator 16 and substitutes therefor the reeistance 56, so that further operation oil the impulse generator is Without etect at this time. 'lihusall the relays ot the sender S are brought baclr to their normal positions, in readiness for the next call.

@parution of the selector W Returning novv to the initiation ot the operation of the sender S to transmit the code l-7--13, the rirst impulse of reversed current sent over the trunk connector 60 and 61 br the relay 1 operates the motor magnet oil t e station 171, and the polarized relay 113 01'" the selector W. The operation or the motor magnet of station 171 advances .the disc o'l that station one step in the manner heet understood -from a reading o1? the above referred 'to/.Field patent. rlhe operation of relay 113 closes a circuit "from positive battery through the Winding or relay 101 to negative battery, energizing' the relay 101. rJl'he enerffization of relay 101 at springs 122 closes a circuit for the relay 102, energizing that relay. At springs 121, relay 101 closes a circuit from positive through springs 135, conductor 162, springs 121, conductor 161, through 'the Winding oi' motor magnet 115 to negative battery, energizing the motor magnet preparatory to advancing the Wipers 138 to 110, inclusive. At springs 123, relay 101 closesl the obvious circuit of relay 105 which energizes and at its armature 130 prepares a locking circuit for itself which includes the Winding of relayy 104:. The energiz'ation o relay 102, at springs 125, closes a point in the circuit of relays 104: and 106. The closure ot' this circuit short-circuits therelay 101, While relay 101 is in its energized position. The energization of relay 102 opens at springs 124e, a point in the circuit ot relay 1027 to render that relay inoperative' at the present time. When the reversal of current in the line 60, 61, is completed, and relay 113 restores, the circuit of relay 101 is opened, and that relay :talls bach. rilhe restoration or springs 123 removes the short circuit from around the relay 104, permitting that relay to energize over a circuit traceable from positive through springs 125, through the Winding or relay 101, through springs 130,

' through the Winding of relay 105 to negative battery. Relay 105 is maintained energized in series with relay 1041. The energization ot relay 104:, at spring 129, prepares 1128, throng a' point in the circuit of relay 108, which circuit is opened at springs 123 at the moment. At spring 128, relay 101 prepares a point in the vcircuit traceable from positive, from s rings 125, sprin s 126, springs the Winding 0% relay 106 to negative batt/ery. Relay 106 is equipped with a copper slug on the armature end of this i core, indicated in the drawings by shaded portion at the upper end of the core, and is therefore s'lovsr to pull up and will not immediately energize. 'llhe restorationl of springs 121 by the deenergization oi relay 101 opens a point in the circuit of the motor ma et 115,'permitting that magnet to :tall back and advance the Wipers 138 to 14001 the switch- W one step. The next reversal of the current in the conductor and 61Y occursbefore relay 106 has had time to energize, and

lrelay 113 is again energized to close the circuit ot relay 101., rlhe cnergization of relay 101 recloses circuit or the motor magnet 115 at springs 121 and of the relay 102 at springs 122 as before. Since the relay 102 is equipped with a copper slu on the heel end ot its core, indicated on t e drawings by the cross section area at the lower end of the core, it is slovv to release and has remained in its energized position during the time that relay 101 was deenergized. rlhe operation ont springs 123 closes the circuit :from positive, through spring 129 and its maire Contact, through the Winding or relay 103 to negative battery, energizingthe relay 108. Relay 103 at springs 127 locks itseliE to the positive battery through springs 125 of the relay 102, thereby insuring that it will remain in its energized position as long as relay 102 is energized. At springs 126, relay 103 opens a point in the circuit ci relay 106, to prevent that relay energizing at that time. The motor magnet being energized by the closing -ol relay 101 is in readiness to advance the Wipers another step When the relay 101 deenergizes. lin this manner the relay 101, motor magnet and the relay 113 Will energize and deenergize responsive to the impulses received over the trunk conductors 60 and 61. 1When the first digit' of the code has been transmitted, in this case a 7, relay 113. comes to rest deenergized, relay 101 is consequently deenergized for a suciently long period of time to permit relay 102 to deenergize. The deenergizatio'n of relay 102 opens the locking circuit of relays 103, 104 and 105, ermitting those relays to deenergize. ith the reception ofthe present signal, Wi g er 110 will be resting upon its seventh ban contact when the switch comes to rest at the end of the first digit, and a circuit will be closed from negative battery through resistance 111,' sprin s 134i-, conductor 160 springs 121, through t e lower Winding of relay 107, throughV springs 13'?, through the Wiper 1110seveuth1banh contact Lacasse engaged by the wiper 140,

resistance Winding and energizes over this hefore, and when impulsing is resumed, the

109, relay 107 does not energize. Relay 109 upon energizing, `at springs 143 locks itself independent of the wiper to the conductor 160-which'is maintained at negative battery potential through resistancelli and the springs 134. The energizationof relay 109 at springs 142 closes a circuit from positive through the` conductor 167, for a purposel which will be best understood from the de- `tails which follow.A f

At the end of the pause period, impulsing is resumed and theswitch W stepped in accordance with the second digit of the code, in this case another 7 The details of this stepping are the sanie as before, and need not be 'repeated at this time. When the wiper 1410 is brought to rest the second time, it

completes the circuit for the relay 111, traceable from negative battery through the resistance 114e and the previously traced circuit to the Wiper 140, which is now resting upon its 141th bankK contact, to the terminal block and jumper associatedwith the con tact, through the winding of the relay 111 topositive battery. Relay 111 energizes-over the circuit, loclclno' itself through springs 119 to the negativelbattery on conductor 160. At s rings 14:8, relay 111 closes a point in the circuit of device 169, connecting one terininal of that device to the conductor 167.,

it the end of the second pause period, the

relays 102 to 105, inclusive, are restored as switch is again stepped in accordance with che last digit of the code, in this case a 13. inasmuch as there are 25 baille contacts in the switch W, the 25th step will, therefore, bring the wipers into engagement with theirnormal contacts and the 26th into engagementvvith the first contact and the 27th into engagement with their second contacts. 'When the wipers come to rest at the' end ofthe thirteen impulses comprising the last digit of the code, a total of 2'? steps will have l been taken by the switch, the Wipers will come to rest upon their second banlrcontacts. A circuit may now De traced from positive through the Wiper 139 and its second bank contact-(through the winding of the relay 108 to negative battery, energizing that relay. The energizatio'n of relay 108 closes a circuit from negative battery through springs 141 to the common conductor 166, thereby completing the circuit through the selected device 169, springs 148, conductor 167 to positive at springs 142. The selectedfdevice 169 is operated -by this impulse. The circuit of the device 169 re- """mains-cl osed as long as' the wipers remain upon their second bank contacts until the sender S sends out a clearing-out code*i through the winding of .109 to positive.. Relay -109 has a high Olearz'ng 'pulse tion of the sender it was pointed out that when the wiper 53 moved out of engagement with its 24th bank contact and into engage- In the foregoing description of the operav ment with its normal contact, the circuit of relay 1 was opened and that relay fell back to transmit a single impulse over the trunk conductor. Responsive to thereceipt ofthis impulse, relay 113 is operated to close .a circuit of relay 101 which energizes, and closes the circuit of relay 102 and of the motor magnet 115 and ofthe relay 105 as before. When the relay 101 restores at the end of the im pulse, relay 104 pulls up as before and completes the circuit ofthe relay 106, that circuit being traceable through springs 125, 126, 128,

to the Winding of there'lay 106. No further impulses are to be received andthe relay 101 remains in its deenergized position long enough-to permit relay 106 to energize. The relay 106although it is slow to pull up, will pull up before the relay 102. deenergizes. When relay 106 pulls up, it locks itself to positive battery on the multipled contacts engaged by the Wiper 138I .over the circuit through springs 132 and 133, thereby insuring that it will remain up as long as the Wiper 138 is out of its normal position. When the `relay 101 fell back it opened the circuit of Amagnet 115 to advance the Wipers one step,

thereby opening the circuit of relay 108 to permit that relay to restore and open the circuit of the device 169i The energizationI of .relay 106 also causes t e circuit of the device 169 to be opened, by removing at springs 1311- negative potential from the conductor and to permit the relays'109 and 111 to restore to their normal positions.V rl`he motor magnet 115 is again energized over a circuit traceable from a positive on the multipled contacts engaged by wiper 138 and that Wiper, springs 132, springs 131, throughthe Winding of the magnet 115 to negative battery. The magnet energizes and opens its own circuit at springs 131, falling back to advance the Wipe/rs one step The magnet 115 will operate in a buzzer-like fashion as long as the wiper 138 encounters positive po tential, and the switch W will be stepped around into its normal position. When the switch reaches its normal position wiper 138 loses its positive potential, relay 106' is de- Venergized, and the selector and associated equipment is in its normal position in readi- .ness for the receipt ofthe next call.

@parution of selector in *non-cailed substatz'fms Since the trunk conductors 60 and 61 are multipled to a plurality of substations, and

since some of those substations will not be called by the digit 7, provision must be made to prevent any of the selectors in those substations from closing a local circuit when the digit 7 is received. For this purpose all of the unused contacts in the bank over which the'wiper 140 of the switch S rotates, are multipled together and connected to positiveba'ttery. At the end of the transmission of the rst digit 7 wiper 140 of all of the switches except the switch W in the substation in Fig. 2 will engage a contact to which positive po"` tential is connected, and when the relay 102 falls back a circuit for the relay 107 will be' 102. vllelay 107 will remain locked up to the positive potential picked up by wiper 140 until the clearing out pulse is received. At springs 135, relay 107 opens a point in the circuit of motor magnet 115, to render that motor magnet unresponsive to further closures of the spring 121 by the pulsing relay 101. v'lhe second train of digits are received, the relay 113 and the relay 101 will operate as before, closing the circuits of the relays 102, 104 and 105 as before, but'the motor magnet 115 will not be operated and the switch will remain set upon the' contacts upon which the wipers are resting.. When the clearing out pulse is received, the relays 10a and 105 are operated to close the circuit of relay 106 as before, and. that relay energizes to unlock relay 107 at springs 134, and to close the restoring circuit as hereinbefore pointed out.

Other @oder As illustrated the sender S and the selector W are arranged for a 27-digit code. 'llhis showing is made by way'ot example only as these devices are capable of being arranged for codes of any number of impulses. lin the sender S the nal cut o oit the code is determined by the contact upon which wiper 53 picks up positive potential, that Contact can be altered to suit requirements. lin the drawings this positive potential is picked up on the eighteenth bank Contact and maintained until after the 24th contact has been passed. lf a 17 digit code were to be sent out by the sender S, this multiplewould be extended to aaeaeas the thirteenth bank contact, and the last digit of the code number which is correspondingly short. For example with the connections as shown and multiple extended to contact 13, the pressingof the key K2 would cause the sender to send out the digits 7 -7 3, totalling v17 impulses.

Similarly in the selector W, the finishing of the code must position the wiper 139 upon the contact leading to the relay 108. Since there are 25 steps in a' half revolution of the wipers 139, and since the selectors are shown connected fora 27 -digit code, this relay is connected to the second contact of the bank, the wiper making a complete revolution plus two steps to reach that contact. lf a 17 -digit code were to be received by the selector W, the relay 108 would be connected to the 17th bank Contact, and the wiper 139 would be positioned vthereon after the 17 steps had been taken.

Thus it will be seen that by suitable connection in the banks ,of theI sender and the selector, codes ot any number of digits can 'be transmitted by the sender and received by the selector. i

ln the code 7-7-13 illustrated above, the first4 pause period occurs when the pulsing relayy 1 is energized, the second pause period occurswith that relay deenergized and the linal or operating period with the relay ener gized. @bviously it is not necessary that this cycle of operations be rigorously adhered to, in act if the iirst digit of the code comprises an even number of impulses the irst pause period will occur with the relay deenergized, if for example, the conductor 7d which controls the cut-od' at the end of the first series of impulses were connected to the contacts of the bank over which wiper 501 rotates, the sender would pause when the relay 1 deenergized. rlhe second pause period may occur with the relay 1 either deenergized or energized. 'llo illustrate this, the key K1 when energized places positive potential on the conductors 72 and 7 3 which are jumpered to conductors 7 5 and 76. When the key K2 is pressed, the sender will send the code 13 2-12, in which case `the relay 1 is energizedvduring both o1" vthe pause periods. 1t is thought that this showing sufliciently describes the invention and that further addition of individual keys and the jumpers and wires through which they control the sender would be a needless complication of the drawin s.

Similarly in the selector the localV circuits may be closed by a number oit combinations of energized relays, two'of which are shown.' The relay 109 and the relay 111 closes the circuit of the device 169 which extends between the bus bars 166 and167'. The closures of relays 110 and 112 will closetJ circuit for the device 170 which circuit includes the bus v bar 166 and a second bus bar 168. As many positive bus bars inaybe included as 'are necratus, I have done so essary, or the devices in asubstation may all be controlled olf one bus bar as desired. Cross-connecting blocks, one side of which contain the wires from the contacts and the bank over which wiper 140 rotates, and the other side which contains the terminals of the various relays affords a convenient means of connecting the selector to set up whatever combination of vcircuits is required.

While I have chosen to showmy invention in connection with a articular type of appaby way of example only, as there are many adaptations and' modifications which can be made by one skilled in the art without departing from the scope of the invention. I have shown individual keys K1- and K2 which ,control the sender S, by Way of example, it being obvious that the contacts l could be auxiliary contacts upon a device, and which contacts are actuated when that device changes -its position to transmit a signal corresponding to the device. This signal selects a particular instrument, for example 169t0 make a record of the movement of the device. This and many other adaptations will be ap arent.

aving thus described my invention, what I consider new and desire to have protected by Letters Patent is pointed `out inv the appended-claims. v

What is claimed is:

1. In an automatic switch, a motor ma a wiper having a normal position and a ank of contacts, certain of said, contacts havingv operable devices connected thereto and the' others having direct ground potential connected thereto, means responsive to a plurality of series of impulses for operating said ma et to move said wiper from its normal position series of steps corresponding to said series of impulses, said wiper coming to rest at the end of each impulse series in en agement with one of. its bankcontacts, an circuit connections including a marginal relay and said wiper completed each time said wiper comes to rest said circuit connections operating one of said devices each time said wiper comes to rest in engagementwith a contact having an operable device connected theretoand said marginal relay operating only when said wiper comes to rest in engag ire ment with one of the contacts to which ound potential is connected to prevent furer operation of said magnet when subsequent series of impulses are received.

2. In an` automatic switch, awiper having a normal osition-and a bank of contacts, certain of said contacts having operable devices connected thereto and the others having direct ground potential connected thereto, a motor magnet, means responsive to a pliirality of series of impulses with pause periods between successive periods for operating said ma et to step said wi er from its normal position one step for eac impulse, said wiper coming to rest during each pause period in engagement with one of its bank contacts, a mar al relay, and means operating automatically each time said wiper comes to rest forincluding said marginal relay in a series circuit includin said wiper and the bank contact with which it is in engagement, said mar inal relay operating in said series circuit if the contact therein has direct ground potential connected thereto to prevent further operation of said magnet res onsive to the reception of succeeding im u e series, but failing to operate in said series circuit if thewcontact therein has an o erable device connected thereto, said operab e device operating in this series circuit.

3. In a selector switch, a pair of wipers having normal positions and banks of contacts, certain bank contacts of one wiper having a pluralit of operable devices connected thereto and t e other bank contacts of said one wiper having direct potential connected thereto, while a certain contact of the bank of the other wiper has a single operable device vconnected thereto, a motor magnet, means responsive to three successive series of impulses for operating said magnet to step said wipers from their normal positions a plurality of steps for each impulse series each of said wipers coming to rest at the end of each 'im ulse series in engagement with a operable devices each time sai one wiper I comes to rest in engagement with one of its certain bank contacts and operating said relay only when said one wiper comes to rest'in engagement with one of its other contacts to prevent further operation of sa'id magnet by said impulse responsive means, and circuit connections completed byl said other wiper when it comes to rest at t e end of the third impulse series in engagement with its certaincontact for operating said single operable device. v

In witness whereof, I hereunto subscribe my name this llth'day of February, A. D.

' HARRY E. HERSHEY.

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