US2011237A - Remote control system - Google Patents

Description

Aug. 13, 1935. G. w. BAUGHMAN I REMOTE CONTROL SYSTEM Filed July 9, 1951 5 Sheets-Sheet l G. w. BAU'GHMAN REMOTE CONTROL SYSTEM A Aug. 13, 1935.

Filed July 9, 1931 5 Sheets-Sheet 2 .v Qu |NM.

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QN NNN NNN INVENTOR: Q. l/Y. oiuhman, @Ri/Mz@ #4 A TTORNEY.

Aug. 13, 1935. G. w. BAUGHMAN REMOTE CONTROL SYSTEM Filed July 9, 1931 5 Sheets-Sheet 3 EUR INVENTOR.' QQ Bcn/M7140 LAm VIHH|||||||| WMM M4. ATTORNEY.

Aug- 13, 1935. G, W. BAUGHMAN 2,01,237

REMOTE CONTROL SYSTEM v I Filed July 9, 1951 5 sheets-sheet 4 To Q -F1- 053/51) ansn'z/zep I j Reza .s @FP l B n 2&3 052 C [Z 6" IB 5l l v B 9 10 n a 12 gna a 012 y Tff C D USB 8] B 0 V'* E 5X l l g 7 j C2;- 051081 07'5 F--c` 6.

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By @721W N3/1 ATTORNEY.

1 Patented Aug. 13, 1935 1 UNITED STATES My invention relates to remote control vsystems of thetype comprising a control oflice 'and one` or more line circuits connecting a plurality of re- 1 mote 1 line stations and arranged `for the 1 transmission of intelligencebetween the ofliceand the 1 stations by 'means of distinctive codes delivered 1.

tothe line circuits. 1 1

In systems of the type-described,1it`1is` cus- "tomary to carry each line circuit throughathe sev-` `eral stations 1in series sof that any breakV in-1 the 1 linecircuit would, in the absence otpreventative means, result in total disablementA of the system.

" My present invention relates to the provision, in

systems 'of the type here contemplated, of: means for locating a faultin the line circuit arid'fcr 1 shunting the line circuit on the *oiiiceside of 'a fault ,so that the system may be employed in nor- 1mal manner to permit the transmissionfof1 codes 11between kthe oice and a11"station`s`up1to1the las 11 .zo y y A 1 I1wil1 describetwo forms of apparatusembodystation onthe oflice sideof thefault.1"1 11 1 `1 1 ing my invention, and will then 4point out the `1ncvel features thereof inclaims. 1 1

1 mote controlsystem:utilizingasingle line cir-V In. the accompanyingdrawings, `r'ig. 1 a diagrammatic View illustrating one-form of-'apparatus` embodying my invention as appliedto arecuitA Figs. 2a and 2b,`when placed end' tolend `with Fig.12a1ontheleft, form a diagrammatic view illustratingl'a modiiied form ofapparatus "em- 1 :bodying my invention as applied to`a"remote con# trol system including a plurality 1o`f line lcircuits. Figs. 3 `to 112, inclusive, are detailviews illustrating portions. YfA the apparatussh'own in Fig. 2 and also embodying my invention.V

f Similar reference characters 1refe11to'1similar parts in each of the'several views;

, Referring rst to Fig. 1, the reference charac- -ters DI .and D2 'designate line Wiresextending 11from a despatchers oflice to a plurality of way l stations at each of which is located ,a linerelay. j Thexline relay` at the ofl'lce is designated OR and `theline relay at each station is designatedfby the reference'character R with an appropriate prex `corresponding to the location. The linecircuit is normally closed andis'supplied with energy from a 510111798; here shown as-a batteryN, locatedat `the despatchers oce. The office and` eachstationis further provided with a transmitterfrelay designated by the reference character T with an `appropriate,.prefix and having a back contact 'ineluded in the line circuit. It 1followstherefore,

`1 that by periodic operation, of each1 transmitter relay, the line circuitmay be periodicallyinter- 1 -rupted and that `by properly controlling theoperation ofthe transmitter relay, the lengths of the line interruptions may be regulated to produce distinctive codes. The operation of the transmitting .relay at each location is controlled -by` ,p

apparatus of the usual form indicated diagram'- i 5 matically by `the rectangle. carrying the legend Code storage, transmitting .and receiving equip- .Vmen :Oneform of code equipment which will operate inthe manner intended, is disclosed and claimed in an application for Letters V'Patent of l0 ftheillnitedfstates,lSerial No. 373,675, filed by 1L., V. Lewis; on June 25, 1929, for Remote controlling apparatus and is described in a book en- 1 titled Centralized Traflic Control System- Time ,I

CodeScheme, Manual No. 502, `dated September z"`51 1931, and published bythe Union Switch & Signal Company, Swissvale, Pennsylvania. 1 Inaddition to the apparatus disclosed in th Lewis application, I provide a fault relay, desig- 1, natedby the reference character FL with an 20 appropriate prex, and controlled by a back contactof the correspondingline relay,` at each in-{ 4termediate station, that is, at each station ex- -cept the one at the remote end of the line. 'Ihese 4fault relays are ofv `the 1 slow pick-up type, and 'Q5 I prefer to adjust the relays in suchmanner that response to a break in the line circuit result-` Aing in deenergization of all of the line relays the fault relay, most remote from the oiiice, will be 1picked up at the expirationof a time interval 30 longer than `the greatest time interval occurring 1 during normalcode operation of the system; .The remaining fault, relays will be picked up succes- Ssively, these relays having time` elements1'grad-1 uated, sc that the fault relaysat stations succesjsivelyA nearer the despatchers cnice become .picked up in order. The deSpatchersoiCe is .also provided with a' fault, relay OFL controlled byaback contactof the oflice line relay OR and I `prefer ,toadjust relay OFL so that it` closes 4'0 V lits front contact ,at the instant of vthe closing Y p `of the front contact of the faultrelay. most remote Afr ornthe despatchers oiiice. 1 The: oilice .fault re lay DFL may v'conveniently be` provided` with a timing device K arranged to commence its operation when relay OFL picks up and to indicate 1the timeinterval fduringwhich the relay' OFL remain-s` closed.- The purposeof this arrange- 1ment willbe:describedhereinaften 1, u x

- The fault relayateach line stationis provided 50 with as tick, circuit controlled `by a release relay associated with the code receiving equipment `at the corresponding :station and' under the control of the despatcher. Referring particularlyfto relay 1FL, the stick circuit for this relay includes ,5.5

a back contact of relay IFP and front contact of relay IFL. Relay iFP is arranged to be energized in response to a distinctive code transmitted from the despatchers cnice and this relay IFP may be similar to the relays EFI, IF2, IFS, etc., shown in Fig. 3 of the Lewis application. It follows that any fault relay, having once become energized, will remainv energized until the ,corresponding relayl FP is picked up by suitable manipulation on the part of the despatcher at the oice. Relay iFP and corresponding relays at other stations are controlled by keys or levers under the control oi the despatcherA in the oflce and these keys are designated by the reference characters FI and F2 in Fig l. These keys Would be placed on the individualpanels illustrated in Fig. 2 of the Lewis application, and would be connected so as to transmit, when the key was operated and the starting button depressed, a dis-` tinctive code adapted to operate the release relay at the corresponding station such as relay IFP at station No.1. YReferring again to the apparatus located at station Nol, relayv IM is a master relay corresponding to the similarly named relay in Fig. 3 'ofv the Lewis application and is arranged to be energized when a code is to be transmitted from station No. l; vWhen relay iM is deenergized, a slowj'acting repeater relay EMB isenergized. Relay IMPat'station No. l is a sectionalizing relay and is arranged when energized to vinterrupt the portion of the line circuit leading to the stations beyond and to 'close the portion ofthe line y'cir- .cuit leading to the oi'lice locally through the as` lvactuated and the 4function intendedto be "conrolledby the code, is operated. In case a code originates at aline station, as soon as the master `relay1M at such station, becomes energized, the

',js'ectiona'lizing relay MP at that station is op- '.er'atedior a time interval vsuiicient to lock 'out yalista-tions more remote. For example, ifa lcode being transmitted from station No. l, the "energization oi master relay IM 'closes a circuit for relay.- iM?, over front contact 5 of relay IM 'and iront contact 6 oi relay Ill/i2.Y Relay IMP be- 'comesienergized sectionalizing 'the yline 'at `station No. 1. At ythe expiration of the holding 'time :of relay IJM'B, this relaydrops 'and "at the expiration yof .an 4additional timeinterval,` relay IMP drops, therebytrestoring the line circuit to all stations. lThe faultfrelays 'FLlat-'the A'more remote stations do Anot pick up'whe'n the '-portion of thedinecircuit leading vto these stations is opened by relay IMP, because, as l"already pointed iout, the fault' relays are adjusted to 'pick up -at thev expiration `of a 'time interval longer than any occurring during normal operation.

. In `thenfleantime, transmitting relay IT :has 'been operated inaccorda-nc-e withtheappropria'te code 'to 'deliver an indicationcode to the deslpatchers' oiic'e. `It will 'be noted that Aa' portion of this''cod'e is delivered only Yto 'trie line 'circuit between station No. Avl and Athe'-'despa'tc'hers oiic'e but that the remainder of the code, transmitted after the release of the sectionalizing relay IMP, is delivered to the entire line circuit. As explained in considerable detail in the Lewis application, the preliminary opening of the line circuit locks out all stations more remote than the transmitting station to prevent interference in the event two stations start transmitting at 'exactly the same time, the one nearest the office taking precedence. To' lock out interfering stations for the balance of 'the code, the pick up circuits for the master relays are controlled over back contacts of slow-release relays energized not only when the line circuit is steadily open but also when the associated line relays are being operated by a code, as is the case at stations between the transmitting station and the oice. In the present invention a portion of the code following the initial opening of the line circuit is also delivered to the more remote stations and these subsequent interruptions oi the line circuit, maintain the lock-out to prevent code transmission from any station more remote than the transmitting station until the completion of the code `in progress. The apparatus for accomplishing this lock-out forms no part of my present invention, and it is suiiicient to state that no station can commence to transmit until the line circuit has been closed for a -xed time interval greater than the normal periods of closed circuit in a code. In my present invention the MP relay at the transmitting station is energized for a time interval` to sectionalize the line circuit and lock out stations more remote, and the MP relay is thereafter again dejenergized, whereupon the remainder of the code being transmitted is delivered to all stations, thus maintaining the lockout effective.

As will be evident from the foregoing, the maximum time any portion of the line circuit is open during anormal, operation is that determined by relay ,MP. vSince this time is less than the operating time of any fault relay, it follows that no fault relay will voperate unless an accidental break in the line circuitoccurs.

In case a break occurs in the line circuit, all line relays become de'energized and at `the expiration of a time interval, one of the fault relays picks up and is subsequently stuck up independently of'the line relay. With'the adjustment ci the fault relays suggested above, the fault relay first 'to operate will be the one located at the intermediate station most remote from the despatchers oflice. When this fault relayvpicks up, the vcorresponding sectionalizing lrelay such as relay 2MP is immediately picked up over a front 4contact 1of the yfault relay. If the consequent shunting ofthe line circuit picks upthe line relays in the portion oi the line -cir- 'cuit leading 'to the cnice, as would be the vcase ii the break -in the line Vcircuit Were beyond this :sta-tion, 'all other f-ault relays Will become. de- 'energized and the system will then be operable f 'etween the station at which the fault relay has sectionalized the line :and the despa'tchers oi- Arice. l'I, however, the operation of the rst fault 'relay does not res'tore the line relays, additional 1fault 'relays 'will become operated until `the line iss-hunted on the 'o'c'e side o'f the break, whereupon the remaining fault relays vwill be de'energize'd and no further'sectionalizingwill take place.

When a fault relay yhas succeeded in restorn'g 'a vportion oi lthe line circuit, an indication 'of Athis ifa'ct'is immediately transmitted 'to the des- Vpatel'lers" Io'iiice. This 'i's'faccomp'lished by vem- "ploying, the fault4 relay as`1acode determin- Aingyrelay such as relay ITK or relayIAK f :the-.Lewis application, and by providing a starting circuit `controlled by each, fault relay and by` a` disagreement `relay FD corresponding, to the Lewis relayhITDTor IAD for `opferatinggthe associated master relayand initiatwinding of-relay iMto terminalC. Themaster to transmit `from stationl No. 1 a distinctive code.

,The code thus sent out `would include an impulse indicating the fact that relay` lIlLwas energized, rand would thus-be different'from the codes ordinarily employed forV transmittingindications -to ythe despatchersi oiice. The despatchers; koflice l provided witha code receiving ,relay `for each station, which relays are selectively responsive` to thecodes originating at the stationswhena- `fault y,relay becomesenergized. and succeedsin restoring the line circuit. Inthe particular in-` stance being described, the code transmitted from `station No. 1, picks up relay Ollr'rlv atthe despatchers voffice andV closes at `its front `contact -anfenergizing circuit fory an'indicator `lamp 9 to inform the despatcher that the fault relay at stationdNo. l `has sectionalized theline `at that "point, It should be noted that relay'n IFD, together with relay `IFL controls `a disagreement vcircuit jtoprovide the starting Acircuit `just-described application.

It `is` to be understood that relayjIFD is coni i trolled `by thel `code transmittingequipment at 40 "that station ina mannersimilar to the control i of relays IHD, ITD, IAD, etc., in the Lewis` application and is therefore picked upwhen` the 1 .code has been transmitted to open the 'starting circuit just described. It is also to be under,-

layOFPI fand corresponding `office relays for stoodthat the` circuits `for controlling` `the `reother4 stations are similar toy those forcontrolling relaysOFI-OFS in Fig. 1 of 4,the Lewis Afteemabrek in the' une circuit` has been `frepaired; the operator` may operate `the keys FI,

` r2; etc., 'for the stamens atwhicnthefault re- .;layaare operated to transmit distinctive codes to operate thel corresponding` relays` IFP, 2ER

l etc.,`as already explained, thereby` breaking the stick circuits for the faultrelays at these sta- 1tions and restoring the normal linecircuit.

' fcase,in.the event of` a break in the `linecircuit,

instead of graduating` the `time elements ofV thefaultfrelays FL to `provide for their successive operation, these relays may all be provided ,with substantially equal time elements.` Iny this all of) the faultrela'ysnvvould become energized, and the relay which rst closed itsfront contact ,would sectionalizethe line, and'if the portion foi,v the line'circuit from the office to thecorrespending station remained `open other faultrelays; `would pick ,upy at random until a fault ref,-

lay was energized on the ofce sideof the break,`

whereupon, the line relays between this point and theoiiicewould becomeenergized.- Furthermore,

i "the fault relay succeeding Vin restoring ,a portion .ot-the `line circuitjwould transmit,an'indi-` cation of,v this fact tov` the despatchers office, by energizing the; associatedA master` relay` `,All

f -fault relays beyond the rstsucceeding in closinga Yportion 'of .the ,line circuit would also-sectionalize, theline `at the corresponding locations; -Thejdespatcher would then proceed to release the energizedfault relay closest to the oice as indicated by thecode delivered by this relay for operatingthe oice relay OFP.` He would do this, as explained above, by manipulation of the prop- `er cnice'` key F.` If the linel remained closed, -he would knowthat the breaklay beyond the next station and he would then proceed to release thefault relays in order, until the release l of a fault relay, resulted in reopening the `line circuit, Whenthis'happens, the faultrelaysagain 'become eiiective to-sectionalize the line and the `despatcher` then proceeds to release the fault `relays a second time in order up to the last station on the office side of the break, whereupon,

the systembetween lthis last station and the of- `nce m-ay vbe employedgin'the usual manner to vtransmit codes between the oiiice and the stations.

Incase it is deemed unnecessary to provideY `joij,indication code transmission under the control of the` faultrelays, the information thereby conveyed may be obtained by the despatcher by the use of timing device K, incase the fault relays areprovided with graduated time elements. Thus,.whena break in the line circuit occurs, relayOF'Ipicks upat the same time the most 'remote fault-relay picks up;` The timingdevice vKithen `measures the interval elapsing before ,a

fault relay-is successful in completing `a portion `ofthelirrecircuia whereupon, `device `K is deenergized, and from the lapse of` time indicated byRthe device can be calculated the number of fault relays vwhich have been picked up, or the ldevice itself can'be calibrated to indicate directly the station atwhich a fault relay was successful in completing a portion ofthe line circuit. j

My invention may be appliedto a remote-'controlisystem employing a plurality of line circuits.

Thus, lin Fig. 2, gIhave applied-my inventiony to `a remote control system comprising three line wiresXL, YL and ZL, providing two message channels or` line circuits between the oiiiceyand` the` line stations.` Each of these line circuits includesa line relay atthe oiiice and at each of the stations, and these line circuits may be selectively interrupted singly or in combination 4to `produce codes whichr actuate receiving apparatus irraccordance With the sequence of the several code'elements. One system operating in this manner-is `disclosed `and claimed in an application for `Letters Patent of the United States, Serial No; `538,380, filed May 18, 1931, by C. S,.

` Snavely, A. `lMiller and R. H. Tunell, for Remote controlsystems, and isdescribed in a book entitled ,Centralized Traiiic` Control System- Circuit Code Scheme, Manual No. i, dated April',V 1931, andpublished by The Union Switch i 8;` Signal,Ctorriparly,` SwssvalefPennsylvania.` In v applyinglniyinvention to a system of the` type contemplated Ain the ,Snavely et al, application, the sectionalizing relay IMP sectionalizes both linecircuits` Vandiis, in turn, controlled by the master relay` IM and its slow-acting repeater relay IMB in the same manner as in Fig. 1.

Similar operations, are Vof course,` provided at peach of the stations but for purposes of explanation, I.l shall refer toapparatus ,located at station No. 1. The fault relay IFL is controlled by, a, .circuit including back contacts of relays IRYand IRX in parallel so that` a break `in either line circuit'will pick upthefault relay if the line circuit is open for a time longer than the greatest -time intervalV normally occurring duringv code `transmission.l The fault relaysmay have graduvated time elements, or may hav-e substantially similar time elements as explained in connection with Fig. 1, and each fault relay is provided With a stick circuit including its ov/n front contact and a back contact of a release relay 5ZR at the station.. In order to provide for codes necessary to lrelease the fault relays at the several stations and to indicate the operation of these relaysV at the oice without necessitating additional code elements, I have made certain changes inthe circuits shown in the book hereinbefore referred to Which describes the Circuit Code scheme disclosed in the Snavely et al. application. Thus in Fig. 3, I have shown the release key Fl on the office panel corresponding to station No. l.v As explained in the book, each control code originating at the oiiice has its fifth code element apportioned to the .control of a call-on signal at the station, and for this control voperation or fth code element has either an X- Ielement or a Y-element. Without interfering with this selection, I propose to insert the releaser key Fi in series with the call-onsignal button so that when the release key is operated, the-fifth element of the resulting control code will consist of a Z-element. Thus, if the fault relay at station No. 1 is energized and the line circuit has been repaired and the despatcher wishes to release this fault relay, he operates the release key Fl (Fig. 3) to its lower position and operates the starting button as explained in the book. When-the resulting contro-l code is transmitted its iifth element will be a Z-element and Y when the code is received at station No. l, relay SZ (Fig. 7) will be energized. As shown in Fig. 8, the closing of relay SZ will prepare a circuit for rrelay 52B which becomes energized when thestation delivery relay D of the Circuit Code scheme becom'esclosed. But when relay EZR picks up, it breaks the sti-ck circuit for relay IFL (Fig. 2a) Relay D remains closed for only a brief interval and relay 5ZR is then restored to its deenergized condition so that the system is ready for a repeated operation should such operation become necessary. Furthermore, I have provided means for transmitting indication codes from eachv station Vwhen the associated fault relay becomes energized and succeeds in restoring the line circuit. Thus, in Fig. l0, Ihave shown a starting circuit for relay SA of the' Circuit Code scheme by means of which this relay may be energized when relay FL becomes closed provided'relay FD is 'deenergized When the fault relay picks up, the starting circuit is closed and the station code transmitting equipment is set into operation. In order to transmit a distinctive indication at the operation oi?r a fault relay, I provide that the fifth impulse or the indication code, which is normally an X or Y, dependingupon the occupancy of the track section at station No. l, shall be a. Z-element. The apparatus for accomplishing this result is shown in Fig. 1l., in which I have illustrated the circuits for the transmitting relays effective during the fifth step of -the indication code. Thus, with relay EFL energized and relay deenergized, the Z-bus for the transmitting relay (ETZ, Fig. 2e) is connected with terminalB as will be plain from the' drawing. During the transmission of this indication code relay SZ (Fig. 7) oi course, lbecomes energized and when relay VC becomes energized .onV the viinal 4impulse 'of the indication code, the pick-up circuit is closed for relay 52T (Fig. 8). When relay 5ZT becomes energized, relay RFD is operated over the circuit shown in Fig. 9 to break the starting circuit illustrated in Fig. 10.. This arrangement is necessary to prevent a repetition of the indication code intended to inform the despatcher of an operation of a faultrelay. When 'an indication code,`thus delivered to the line circuit, is received at the despatchers olice, relay-"i352 becomes energized on the fifth element of the code (Fig. 4) Thereafter, when the appropriate panel relay DD becomes energized, a panel indication relay' UFP (Fig. 5) is operated to light the lamp 9 for the purpose of informing the despatcher that the fault relay at the corresponding station is energized. It will be noted that-I have shunted la front contact of the panel indicating relay' UFP across the control circuit of relay TK as shown in Fig. 6 for the purpose of preventing a loss of track indication during the reception oi a code which indicates the operation of the fault relay. In similar manner in Fig. l2, I have illustrated a iront .contact of relay 52B. at the station connectediacross the control lcircuit for relay SYS toprevent an interference with a normal control of the call-on signal as a result of the release of a fault relay at the corresponding station. lIn connection With Figs 3 to l2, inclusive, it should be pointed out that these views illustrate ythe only changes v/hich'are necessary in the drawings of the book describing the Circuit Code scheine disclosed in the Snavely et al. application in order to practice my invention except for the additional apparatus illustrated in Figs. 28L and 2b.

The operation of the apparatus in Fig. 2 is identical with the operation of the apparatus in Fig. l, it being noted that the oice fault relay @FL is controlled by back contacts of both oiiice line relays iRX and "GRY, and is provided with a stick circuit controlled by a hand release I2. When a break occurs in either line circuit, therefore, relay EFL becomes energized and remains in` this condition until released manually by the despatcher. Furthermore, the relay GFL controls an indication lamp I3, calling the despatchers attention to the condition of this relay.

It will be plain from the foregoing that I have provided means applicable to systems employing one or more series line circuits and responsive to a break in the line `circuit which holds the circuit open for an abnormally long time,A to'au- -tomatically place a shunt across the line circuit or circuits on the office side of the break, and thereafter to transmit to the despatchers oihce that an indication code has been placed upon the line, so that normal and ordinary operation of at least a portion of the line circuit is assured. Furthermore, I have provided means for informing the despatcher concerning the exact location of any break in the line circuit and for also permitting him to release the sectionalizing means from the oiice.

Y Although I have herein shown and described only two forms of apparatus embodying my invention, it is understood that Vvarious changes and modifications may be made therein within the scope of the appended claims without departing trom the spirit and scope of my invention.

Having thus described my invention, what I claimis:

il. In a remote controlv system comprising an oftlcea'nd a plurality of stations connected by a line circuit, means at the cnice and at each station f for transmitting codesnduring which said line circuit is periodicallyinterrupted, a line re-v lay located at one station and included-in the l ing means is operated to shunt the line'vcircuit reenergized, and manually controllable restoring:V

e mean'sfgovernedby said line relay for restoring portion of said line circuit leading from the oilice e l tosuch station, time measuring means controlled by said line` relay and arrangedto be operated onlywhen said -line relay 'is deenergized for a f time interval longer than thegreatest open cirmission,means eiective when said time measuratsaid one stationto` permit the line relay to-be said: time measuring means toits non-operated condition. 1 `2. In combination with an office and a normally l closed line circuitcomprising a pair of line wires extending from an oiiice to a plurality of stations, time' measuring means effective upon the occurrenceof a breakin said line circuit to connect one of said'vvires to the other at stations successivelyv effective When operatedcto shunt `the linef circuit a'teac'h stationand to openthe portion of thellne circuit leading from suchstation" to stations more remote from the oicetoprevent the 'energization of" such portionja master relayat eachlstation.. effective when actuated to govern the transmission/cria code 'during lvvhic'ni the portion of the line circuit extendingfrom the office to such station is periodically interrupted, means effective whengany master relay i`s`actuatedto operate the associated sectionalizing means for a measured timejinterval lessthanthelength of any said code, whereby a portion of the code is delivered` ltozthe entire line circuit, ai fault `relay at each station for operating the associated `sectionaliz-y ing means, and means forroperatingeach fault relay` when the" line circuit remains open for a measured longertime interval, said fault relays l'. being thereby rendered selectively responsive to a breakin said line circuit.

4. In a remote control system, ansoiiice and a` plurality of stations connectedby aline circuit, sectionalizing means at each Astation effective Whenoperated to openthenportion of theline e circuit leadingfrom the ofiice through said station to the nextsucceeding station, a contact at eachtstation `for-shunting said open portion to permit the portion of the linel circuit 'leading from o theofyficehtogsaid stationto4 become closed; means `for simultaneously` operating the sectionalizing` means atall the stations, meansresponsive `tothe operation of" each sectionalizingmeans `for closing thecontact at the corresponding station, and

`e means operating only` if `the portion oftheline circuitincluding' said `contact becomes closed for restoring "the sectionalizing means to its non-` operated condition. j 3

t normally closed line circuit extending fromra cone trol' oiiice toapluralityof stations and including ,i in series Va normally energized line relayand the closedcontacto'f an sectionalizing relay at` each station,` a codereceiver'controlled by each said f li'nerelay; means operating; whenl the line circuit` cuit interval occurring during normal codetransstations on `the oilicesideof the break.

Remote Acontrolling apparatus comprising a` is openedat any pointvto open each of said contacts, means ate'ach station for shuntingthe contact atthe station when saidcontact is opento` permit the portion of the line circuit leading to the oflioe and including the. line .relay at that stationtofbecome closed, and means'operated by the code `receiver controlled by saidline relay for closing said contact to permit the portionof the liney circuit from the ofiicethr'ough saidY station .to`

thenext succeeding station'to beclosed. l

6. Remote controlling apparatus comprising al plurality of stations each having a line relay and a contact closed when the line relay is energized, a' normally closed `line circuit including asource ofnenergy, each` oir saidfline relays and each of said contacts',`means ateach station responsive to the deenergization'of the line relay at the stationiv for closingat said Vstation the portionof the line circuit leading from said stationin' the direction e,

of thesource of lenergy-,'-said portion including the line relay at said station, a code receiver responsive to the energization' of said line relay over said portion, restoring means controlled by said` code receivenand means rendered effective When said restoring means is actuatedtoclose the Contact at said station to` complete the portion of said line circuit fromsaid source throughlsaid'station to the next succeedingV station;A i

'7; In a remote controllsystem, an office and aplurality `of stations connected by a, line circuit, a normally energized linerelay `at each station in said circuit, alnormally closed contact at said staf tion in the portion of theline circuit-leading to more remote stations, a normally open contactat each station adapted when 1 closed to shunt saidA portion to complete a circuit for the linerelay at such station provided theportion of theline cirf cuit leading fromthe oice toY such station is intact, means at each station responsive` only to `a prolonged deenergization ofthe line relay atthe station to `open the. normally closed contact: and

to `closethe normally open contact at such station, and meanscontrolled by each line relayand rendered effective when such line relay becomes energized for restoring to .normal said normally open and normally closedfcontacts to thereby establish a circuit for the` line `relay at the next succeeding station. 1- Y 8. In a remote control system comprising an oice and a normally energized line circuit eX- tending. from said oiiice through aplurality of stations,r .sectionalizing means i responsive to a. break in said'line circuit to locally interrupt the portion of said line circuitateach station leading to :stations more remote from-` the office and" for shunting thev interrupted portion toirenderavailable theremainingportion `of said line circuit, restoring means comprising ainanually con trollable` relay at each station controlled` over said remaining portion of the line circuit for restoring the line circuitfserially-through th 9, I-n a remotecontrol system comprising an ofce and a line circuit extending from said cnice e through a plurality` of stations, a fault relay `at each station, a normally closed Contact,` controlledlby each said :fault relay and included in said line-circuit, a normally opencontact arf-U rangedtoshunt said linecircuit when said normally closedcontact opens',.means. responsive to abreak in saidline circuit to operate all said fault relays 4to open' said normally closed contacts` and thereby sectionalize the line circuit at eachstation` and to close said normally `open contacts to thereby Vshunt each sectiomandmeans at each y isi asf l0. In a remote control system, comprising anl oiiice and a line circuit extending from said oice successively through each of a plurality of stations, va relay at each station having a normally closed back contact in the portion of the line circuit leading tothe next succeeding station, and a front contact for completing the portion of the line circuit leading to the office when the back contact is open, means responsive to a break in said line circuit to energize all said relays, and means Iat each station for releasing the relay at such station provided the portion of the line circuit from the oiiice to such station. is intact, to extend said portion to the next succeeding station.

ll. In a remote control system, a normally closed line circuit connecting anoice and a plurality of stations and including a line relay at each station, a master relay at each station for controlling the transmission of codes to said ofce, a sectionalizing relay at each station having a back contact in the portion of the line circuit leading to more remote stations and a front contact adapted when closed to shunt said portion to permit the portion ofthe line circuit leading to the ofIice and including the line relay at such vstation to become closed, means effective when said master relay becomes energized to pick up said sectionalizing relay for a brief time interval only even though said master relay remains energized for a longer time interval, and other means eective to pick up said sectionalizing relay if lthe line relay at such station remains deenergized for a relatively long time interval.

12. In a remote control system, an oce and a plurality of stations connected by a line circuit,

.means for transmitting codes during which said line circuit is periodically interrupted, sectionalizing means at each station effective when operated to open the portion of the line circuit leading from the oiiice through such'station to the nextsucceeding station, a contact at each station for shunting said open portion to permit the portion of the line circuit leading from the oiiice to such station to become closed, means operating'.

- open contact controlled by said fault relay arranged to shunt the portion of the line circuit leading to more remote stations to complete a circuit extending from the office to said station when the portion of the line circuit leading to more remote stations is open, means responsive to a break in said line circuit to operate said fault relay to close said contact, a stick circuit for holding said fault relay energized irrespective of the condition of said line circuit, a manually controllable relay at said station energized only when the portion of the line circuit extending fromy the oiiice to said station is intact, and'means` con-y trolled by said manually controlled relay when energized for opening said stick circuit to restore the fault relay to its original condition.

station for restoring each fault relay toits origv alizing relay at each station effective when operated to open the portion of the line circuit leading from the oilice through such station to thenext suceeding station and to shunt said open portion to render the portion of the line circuit extending from the ciiice to such station available ior codeY transmission, means controlled by each code transmitter for operating the associated sectionalizing relay, a fault relay at each station which operates when the line circuit isv opened for a measured time interval longer than any opencircuit interval occurring during normal code transmission, means controlled by each fault relay When operated for operating the associated sectionalizing relay and for also closing the starting circuit for the associated code transmitter, indication means controlled by the code receiver at the office for selectively indicating the condition of said fault` relays, and means at each station controlled by the code receiver at each station for releasing the associated fault relay.

15. In a remote control system, an oiiice and a plurality of stations connected by a line circuit which at times is supplied with codes during which the line circuit is briefly interrupted, a plurality of fault relays distributed along said line circuit, there being one fault relay at each station, a contact controlled by each fault relay for shunting the line circuit to permit the portion of the line circuit extending from the oice to the corresponding station to become energized, means responsive to a break in said line circuit and `eiective when theline circuit has been deenergized for an abnormally long interval to operate the fault relays to close said contacts one at a time in sequence at stations progressively nearer the oiiice beginning with the most remote station, and means responsive to the energization of the portion of the line circuit including the contact at the last station on the otlice side of the break for preventing operation of the remaining fault relays.

v16. In a remote control system, an oiiice and a plurality of stations, a normally energized line circuit extending from the office serially through said stations including a source of current at the cnice and code transmitting contacts at the oflice and at each station, a plurality of slow-acting fault relays including one at each station, the fault relay at thestation most remote from the cnice having a time element which exceeds the longest interval the line circuit is open during normal operation. of'any of said contacts and the faul relay at veach remaining station having a time element longer than that of the fault relay at the next succeeding station, means for energizing all of said fault relays When said line circuit is opened, means controlled by each fault relay atthe end of its time element for shunting said line circuit to restore the portion of the line circuit extending from the oii'ice to such station, andr means responsive to the flow of current in the' portion of the line circuit restored by the operation of any fault relay to prevent the operation ofthe remaining fault relays having longer time elements. 4 l

17. In a remote control system-including an oiiice anda plurality of stations connected by a line circuit, station apparatus including a master relay for governing the transmissionrof codes during which said line circuit is periodically interrupted, a line relay included in said line cirl cuit, a sectionalizing relay'eilective when ener- #10 transmission over the portion of the line circuit extending from the oiiice to said station andingized to shunt the line circuit to permit code cluding said line` relay, afault relay operating `only if energized for a time interval longer than any open-circuitV interval during normal code transmission, a pickup circuit for said fault relay including a back Contact of said line relay, a stick circuit for said fault relay independent of said back contact, and means rendered effectivev when said fault relay operates to energize said master relay and said sectionalizing relay.

18. In a remote control system, an oilice` and a plurality of stations connected by a plurality of normally energized line circuits extending from said o'ice serially through `said stations, a fault relay at each station, a pluralityof normally closed contacts controlled by each ,said fault relay including one Contact in each line` circuit,

`a normally open contact at each station for each line circuit arranged to shunt such line circuit when the corresponding normally closed contact opens, means responsive to a break in any one of said line circuits to operate all said fault relays to open said normally closed contacts and thereby sectionalize each line circuit at each station and to close said normally open contacts to thereby C shunt each section, and means at each station for restoring the fault relay at such' station provided all said line circuits areintact from the office to` that station. f

19. Remote controlling apparatus comprising an oilice and a plurality of stations, a line relay at each station, a contact at each station controlled sive to the opening of said line circuit for establishing communication between said oice and each station in turncomprising means at each station rendered eiective when the line circuit is opened to open the contact at such station and to then shunt the line circuit to establish a circuit for the corresponding line relay provided the portion of the line 'circuit extending from the oiiice to such station is intact, and means controlled by each code receiver for extending such portion to the next succeeding station.

20. In a remote control system, an oiiice anda plurality of stations, a normally energized line circuit extending from the oilice serially through said stations including a source of current and a code transmitting Contact vat the ofice, sectionalizing means associated with at least one station responsive to a break in said line circuit to close a shunt to restore a portion of` said line circuit provided the line circuit is intact from the office to said one station, code responsive meansvat each station controlled over said line circuit, the code responsive means at said one station being rendered responsive to the operation of said contact when the shunt at said one station is closed, provided the line circuit is intact from the oce to said station, and means controlled bythe code responsive means at said l one station for releasing said sectionalizing means.

21. In a remote control system, an olce and a f plurality of stations, a normally energized line circuit extending from the oi'ice serially through said stations and including a source of current `and a code transmitter contact at said oflice,

sectionalizing means at each station responsive to a break in the line circuit to close a shunt to complete a circuit for said source provided the portion of the line circuit extending from the oiiice to such station is intact, a code receiver at each station rendered responsive to the operation of said code transmitting contact by the closing` of said line circuitportion, and means controlled by each code receiver for releasing the associated sectionalizing means to restore the line circuit through such `station to its normal condition. GEORGE W. BAUGHMAN.

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