US833907A - Signaling apparatus for telephone toll-lines. - Google Patents

Description

No. 833,907. PATENTED OCT. 23, 1906. J. G. WRAY, H. T. GARDNER & W. G. KINTON. .SIGNALING APPARATUS FOR TELEPHONE TOLL LINES.

APPLICATION FILED JULY 3, 1905.

2 SHBETSSHBET 1 INVENTORJ, A? 3%- g 7 BY 11%; l K

ATTORNEY. A

WITNESSES No. 833,907. PATENTED OCT. 23, 1906.

' J. G. WRAY, H. T. GARDNERK; W. G. KINTON.

SIGNALING APPARATUS FOR TELEPHONE TOLL LINES.

APPLIOATION FILED JULY 3. 1905.

' 2 siums-snfl z.

INVENTORJ,

ATTORNEY.

WITNESSES.-

* UNITEDSTATES PATENT OFFICE.

- JAMES e. WRAY, OF CHICAGO, HERBERTT. GARDNER. F MAYWOOD, AND WILLIAM G. KINTONQOF cnioAco, ILLINOIS, AssIeNoRs TO phone-exchange system, and is mainly em- AMERlCAN TELEPHONE AND T TION OF NEW YORK.

To all whom it may concern:

Be it known that we, JAMES'G. WRAY, residing at Chicago, HERBERT T. GARDNER, residing at Maywood, and WILLIAM 'G. KINTON,

residing at ()hicago,in the county of Cook and State of Illinois, have invented certain Improvements in Signaling'Apparatus for Telephone Toll-Lines, of which the following is a specification. I

The present invention relates to a telebodied in thecall signaling andsupervisory 1signaling devices used in connection with tolllnes. r In accordance with the invention the call signaling system for the station'wanted is. 0

the party-lines and the signals branched.

from oppositesides of the line to a third'conductor or ground connection, while the springjack connections are reversed, so that'in twoparty lines no change ofdirection in the signaling-current is required.

In connection with four-party lines th I two signals which are branched from; the

same side of the line are arranged to respond to pulsating currents flowing in opposite directions, and an electromagnetic pole-changing: switch is employed at the called central.

station, which is under the control of a key at said station. i

The supervisory signals are so arranged as to cause the signal at the calling central station to be displayed when the connection is made with the called station and to be retiredwhen the called subscriber takes down his receiver. At the called central station the supervisory signal is displayed upon the insertion of the plug in the 'ack at the callingstation and retired upon t e insertion of the plug in the ack of the called subscribers line. When conversation has been finished and the called subscriber has-hung up his receiver, the supervisory signal is displayed at the Specification of Letters Patent.

Application filed July 3, 1905. Serial No. 268,216-

phone at station N, and asks ment of a trunk. Assuming that the trunk ELEGRAPH" GOMPAN Y, A CORPORA- SIGNALING-APPARATUS Fon' TELEPHONE TOLL-LINES.

iatented Oct. 23, 1906.

called central station is displayed and is finally retired uponthe removal of the plug at the latter station. i r s Figure 1 is a diagram of the cord-circuit at the calling central station or toll operators station, and Fig. 2 is a diagram of the cordcircuit at the called central station where the wanted subscribers line is connected. It is to be understood in tracing the circuits, in connection with the following description, thatthe conductors a and a and b and b? in calling central station, and u on the removal 1 of the. plug at that station t e signal at the Fig. 2 are continuations, respectively, of. the

tion operators and the subscribers will be.

followed, beginning with the part performed by the toll operator after receiving a call for connection with a substation at another central station. x

The toll operators station, which willbe herelnafter designated as station M, is shown in Fig. 1. Upon receiving a call fora subscriber Whose line is connected with another central station, such as that shown in Fig. 2 and hereinafter referred to as station N, the operator at station M first presses the .key a, connecting her telephone, through the conductors a" and (1, with the o erators telefbr the assign represented by the. conductors b" and b and the cord set shown in Fig. 2 is the one as-. signed, the operator at station-M places the plug A in the jack A thereby connecting her cord SGfl'WltlI the cord set at station N. This establishes a circuit supplied-with current from the batter-v B at station N, which circuit passes through conductors 1, 2, and 3 tothe coil b of relay 6, conductor 4, armature c of relay 0, conductor 5, winding (1 of induction-coil d, conductor b, short spring A of jack A ti -termina A of the plug A, conductors .6 and 7, winding of relay e, conductor 8, ring A of plug A, spring A of jack A conductor b winding of of inductioncoil (1 conductor 9, armature c of relay 0,

conductor 10, winding-btof relay 1), and conductors 12 and 13 back to the battery. This attracts the armature e of relay 6 at the station M, thus closing the circuit through the supervisory signal M at station M. It also causes the attraction of the armature b 'of the relay b, thereby closing a circuit through conductors 1, 2, and 2, armature g of relay.

conductor 14, armature b and conductors 7 '12 and 13 back to the battery B, thus lighting the supervisory lamp N at station The lighting of the lampN notifies the operator at station N that connection has been,

jack C? on the single-party line, which is representedas leading to station 500. Upon theinsertionof the plugin the jack the usual local circuit is closed through the sleeve C and-frame C this circuit including a wind-' ing it upon a'relayh, the winding of ,the relay g, and :the winding of the cutofi relay k.

This-energizesthe cut-ofl' relay 7c and the relay g, but does not cause the operation of the armature h of relay h, since "the coil 71? is merely a retaining-coil, the purpose of which will be hereinafter. described in-"connect-ion with the selective signaling'of a four-party line. The energization of therelay 9 causes the armatures g3, y 9, andg to be attracted,

the-attraction of the armature g breaking the-circuit through the supervisorylamp N 2 and retiring this'signal. At the same time thearmature g establishes a circuit through the lamp N which is under the control of relays b and c, as will be hereinafter described.

The signal to the called subscriber is underthe control of the operator at station M, the selection of the signal, however, in connection with party-lines. being under the control of the operator at station N, as will be hereinafter described. In signaling the called subscriber the operator at station M presses the key In, thereby connecting the terminals of a generator m to the conductors b and 11 respectively, the generatorcurrent in this case, however, being utilized not for direct signaling, but for controlling circuits at station N, whereby a signal is sent to the proper subscriberfrom the generator at the latter station. It is' to be understood, of course, that the signalinggenerator at-station-M is merely used for convenience in this connection, so that the same key can be used for direct signaling, if desired. So far as relates to the operations at station N any other source of current under the control of the operator at station M would answer the purpose equallywell. Starting with the conductor b the circuit from the source of current or generator m may be traced to the winding d fo't the induction-coild", after passing through'which it divides, one branch leading and the receiver taken down.

directly through the condenser it and winding (2 back to the generator through the conductor 1), another branch leading through condenser o, conductor 15, and relay 7),

through the coil (1 to conductor 1), 850., while still a third path for the current is afforded through conductor 9, armature a, conductor 10, winding 1), conductor 12, conductor 13, battery 13, conductors 1, 2, and 3, winding b conductor 4, armature c conductor 5, winding (1 of the induction-coil d, and conductor b. The latter or third circuit is, however, only momentarily closed and is at once superseded. by a circuit through battery B, which includes conductors 1 2 3, winding b conductor 4, armature c conductor 40, ar mature c conductor 10, winding 6, conductors 12 and 13 to battery B. The second of the above-described circuits energizes relay p, thus maintaining the attraction of the armature- -p while the last-named circuit through battery B maintains the attraction of the armature b The attraction of the armature p closes a circuit through the relayfrom the generator 1" over conductors 19 and- 20 to thering C of the plug C and thence over the line and through the signal at station 500 and back to the tip C of said plug, the conductors 21 and 22, winding (1 of induction-coil d, and conductors 23 and 24 to the generator.

Upon the release of the key m at station M the relay p becomes deenergized, thus breaking the circuit through the relay 9 and releasing the armature (1 so that the signaling-circuit to the called substation is broken, the release of the said armature also completing the talking-circuit through the inductioncoil windings and battery. When the subscriber at the substation takes down the receiver, thereby short-circuiting the associatedbondenser and signal, the current in the talking-circuit flows through the relays, thus causing the attraction of the armature s, which completes a circuit from battery B through conductor 1, relay 0, conductor 16, armature s conductor 25, armature b and conductors 12 and 13 back to the said battery. The consequent attraction of the armatures c and c breaks the circuit previouslv traced through the relay. e at station M so that'the supervisory signal M is retired,

thus notifying the operator at said station that the proper connection has been made In order to maintain the armature-b of the relay 1) attracted for the purpose of controlling the signal N the armaturesc and c are arranged to close a circuit from the battery B,

including the windings of the relay I), this circuit being through the conductors 1', 2, 3, and 4, armatures c and connected together when attracted. by the conductor 40, conductor 10, winling b, conductors 12 and 13 back to the battery. The maintenance of the armature b is necessary for the purpose of closing a circuit. through the su ervisory, signal N which circuit 18 control ed,

as will be hereinafter described, from the station M; prior to the removal of the plug C from the jack at station N.

When the subscriber at the called substae tion hangs up the receiver, thereby cutting out the conductive connection between the two lines, the relay 3 becomes, deenergized, and the armature 8 thereof falls back, thus breaking the circuit through the relay 0, so

that the armatures c and c are released and return to theirback contacts. This reestablishes'the circuit through the con'chicto'rs .1, 2,3, 4,'and 5, ,b, 6, 7, relay 6, &c., previously traced, and causes the attraction of the armature e, so that thesupervisory signal M is established- The operator at station M is ,thus informed that conversation has been finished and removes the plug A from the jack A This breaks the circuit through the relay 1), which circuit was originally established at the first insertion of the plug and which has been restored to its first closed cir-' cuit connections by the deenergizing of the relay cdue to the hanging up of the receiver at the called'substation, as described. The relay 6 is thus finally cleenergizedfand the armature" b returns to its back contact, as shown in the drawings, thus connecting the conductor 12, -with,a' conductor '26, which completes a circuit through the supervisory lamp N 2 including the conductors 1 2, armature g conductor 26, armature b and conductors 12 and'13. The supervisory signal tral stations; the relay 0 when operating to control thesignal M also serving to control a circuit through the relay 1), so as to maintain the armature thereof in such position as to.

I control" the signal N so that the said signal will be responsive'to the operation of withdrawing the plug from the jack at station M. Relay 7) is energized when the plug A is first inserted atthe calling central station, thus closing a circuit which depends .for its, con

tinuity upon the denergization of relay 0.

'Relay 0 then becomes energized, but in so doing closes another-circuit through relay 1).-

Un'der these conditions while relay 6 is still in condition to control the signal N the relay operation of the relay 0, due'to the hanging up of the receiver, the circuit through the re- 'l'ay I) is the same as that originally established upon the insertion of the plug A-at station M and the plug Cat station N, sothat upon the removal of the plug A the said relay will be denergized, causing thesignal N r to be dis layed.

The ca ling and supervisory signaling sys tems above described ,may be utilized in connection with two and'four party lines at the same central office, as welli'as with single-- party lines, the multi le-jack," or jack per. "station-system, being erein shown as emurpose. 1 In the CfLSG Of ISL two-paft'yli'neor example, the line shown ployed for the as having the'stations 501 and 502 located thereonspring-jacks having reversed. connections are emplo ed, and the signals branched to round rom the opposite sides of the line. in this case the operator at station N has nothing to do except place the plug in the right jack of the twoartylin'e' e called.

in order to select the substation to In the four-party-line the bellsbridgedv to ground on the same side of the line are arsite directions, and in connection with the jacks of the four-party line a key it is em-,

- In the position shown in Fig. 2 the signal-' ing-current, the circuit for which was previously traced in describing thesignaling of station 500,is assumed to pass from the negative brush r of the generator 1" and consists of negative impulses. quired has a signal which will respond to current flowing in the opposite direction, as is .the case'withfstations 504 and 506, the key't is employed and manipulated prior to the 111- sertion of the lug C in the proper jack, thus closing a loca circuit through the main coil of the relay h and causin the armature h thereof to be attracted. tarting from the positive brush or generator-pole-r in this casethe ath of the positive signaling-current may e traced through armature k of relay h, conductor 19, armature q? of relay g, conductor 20, armature g, ring contactO of If the station re ranged to respond to current flowing in oppo the switch-plug C, the long contact-s ring of i jacks 504 or 506*,as the casemay e,-and their corresponding main conductors to the call-bell at .the'wanted substation, appropriately adjusted to respond to plus currents transmitted over onev or the other oflsaid main conductors, the said bell, with its as'so-' ciated resistance at, being connected in an earth branch of its main. conductor, thence by earth return and central- station conductors 23 and 24 to the opposite brush or pole of the enerator. The circuit through the main coi of the relay h is broken upon the attraction of the armature 9 when the plug C is inserted; but the supplemental coil h is therefore, that no further description is re- I quired.

It is to be understood, of course, that the drawing is a conventional illustration of the system, the relays being shown where the control of two or more circuits is involved as provided with two or more armatures. In

. practice each relay may be and usually is provided with a single armature adapted to actuate such contacts as may be necessary for the control of the several circuits.

In order to avoid any possibility of misunderstandmg, it may be stated that the lowermost jack E of each set of jacks shown in the drawings is the answering-jack for the line to which it belongs, the operation of said answering-jacks not being referred to, since no noveltyis involved, the jacks bein shown simply to complete the illustration of the system in genera What we claim is 1. In a telephone system, a calling central station; a called central station; a supervisory signal at the calling central station; a relay controlling the operation of said signal; a circuit-controller for said relay located at the called central station; a relay for said circuit-controller ;a circuit for said relay including the substation line-circuit a supervisory signal at the called central station; a circuitcontrolling relay therefor; a circuit for said relay including the calling central-station line-circuit, and a branch circuit thereof for said supervisory signal at the called station, the energization of said circuit-controlling relay being maintained until the plug and. jack at the calling-station'have been separated.

2. In a telephone-exchange system, a callin central station; a source of current at said ca ling central station; a' called central station; a source of signaling-current at said cal-led central station; a circuit for said source of signaling-current; a relay controlling the circuit for said source of signaling-current a circuit for energizing said relay; a circuitcontrolling relay for said circuit; means for closing a circuit from the source of current at the calling central station through said relay; a supervisory-si nal relay, the coils of which are included in t e same circuit, and a supervisory signal in a branch of said circuit and controlled by said relay.

In a telephone-exchange system, a calling central station; a source of current at said calling central station; a called central station; a source of signaling-current at said called central station; a circuit for said source of signaling-current; a relay controlling the circuit for said source of signaling-current; a circuit for energizing said relay; a circuitcontrolling relay for said circuit; means for closing a circuit from the source of current at the calling central station through said relay; a supervisory-signal relay, the coils of which are included in said circuit; a supervisory signal in a branch of said circuit and controlled by said relay a supervisory-signal relay at the calling central station; a circuit-controller for I said relay located at the called central station and in operative relation with the calledsubstation line-circuit; said first-named supervisory-signal relay and said controller cooperating to control the supervisory signals at the two central stations.

4. In a telephone system, a calling central station; a called central station; a supervisory signal at the calling central station; a relay controlling the operation of said signal; a circuit-controller for said relay located at the called central station; a relay for said circuit-controller; a circuit for said relay including the substation line-circuit a supervisory signal at the called central station; a circuitcontrolling relay therefor; a circuit for said relay including the calling central-station line-circuit, and a branch circuit thereof for said supervisory signal at the called station; the energization of said circuit-controllin relay being maintained until the plug and ack at the calling-station have been separated; and means for retiring said last-named si nal upon the insertion of the plug in the jac of the called subscribers line.

In testimony whereof We have signed our names to this specification, in the presence of two subscribing witnesses, this 28th day of June, 1905.

JAMES G. WRAY. HERBERT T. GARDNER. WILLIAM G. KINTON.

Witnesses:

MARION A. REEVE, GEORGE E. CHIPMAN.

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