US850344A - Telephone-exchange. - Google Patents

Description

N0.v85 0,344. PATENTED APR.16, 1907.

Y E. E. CLEMENT. TELEPHONE EXCHANGE SYSTEM.

. APPLICATION FILED MAR. 20. 1905.

2 SHZEES-SHEET 1.

PATENTED APR. 16, 1907.

5. E. CLEMENT. TELEPHONE EXCHANGE SYSTEM-v APPLIOATION FILED MAR 20, 1905.

2'SHEETSSHEET 2.

. have biit one 'signal' and that-is-not controlled' in any-way by complicated means,

" EDWARD or:wAsHmqToa-bismwi :QF m 1 'i pnmionmea amt 20,1905. seminal 251,041.

To 'a/ZZ whoirt ittmalyeohc ern:

Beit known that I, EDWARD E. CLEMENT-5 a citizen of the United States, r'esidingyat. in the District of ,Columbim '5 have invented certain new and useful 'Im- Washington,

and reduce.

" ployed while increasing-their efiicieney;

: di'vi edjmultiplej system, in w such as polarized magnets-and the like. ,The

"to main-switchboard -at" the. oentra'loffice. is a divided .into.- two or more 'divisio'ns, {each f.

1; which' isa complete multiple board in itself with a' full complement of i -answering an multiple jacks for theline's-which are repreisented in its extent. The =answering-jacks,

or shutters arejthe same in ordinary use and'needfi'iotfbe ofvan specialitype. Infect my iinv'entionjis'f app cable-to any. type o 1 6'- switchboard and apparatus and to; any air- ,cuit. I have shown it-asapplied to- :1 Comv '1- mon-hattery-circnit having a two-wire cord andra three-wire} jack connection of the most a'dvajn'ced' type now lmown in service; but it 3 5 'mayb'e applied 'gwith equal, facility to any;

type or any 'variety of system without sacr fice of its -e ssentialfeatures.

jacket some one division. Each't ,for-every one of its-multiple jacks a signal,

such as a lamp controlled by amagnet soeon- -nected that. the particular magnet a'ndthe "5 particularlsi aldesired can be selected-bye subscriber w en calling. Each snbseribers line is of course represented on some one of the divisions all itssections, but not on the, other divisions. For calls on that division cono nections are made direct; but for those on others they aretrunked. -The method of this trunking the calls is of 'the essence ofmy (invention; Eve 'call.;is;t'riin'.ked-;that is,

Specification of Letters Patent.

provements; Telephone-Exchange.'-- Sys 2 ftems', 10f which j the following .isgai 'specific a-'-- f tion; reference fbeing had therein to the ac a y n f rew s 'w r fro-- 'nvent1o11 relates to telephone systems;

andhas for its object to siinp v the expense oflar e' systems, especiallythose; ei-switchhoards' are em-- mean oneinterconnecting center within four-'- v to walls,'but :anyeorrel'ated' group; of center-sf. Between the "divisions of the; main board trunk-linesextend. Each trunkis multipled 40 to all the divisions and has'a terminal plu%o"rl as 0 orders. r

trunked, as herein s t forth, with manifest advantape and with the same ease'and oer-1 f thelin'e ack-witliont' any a 1 Patentedpril rs, 190?."

predetermined selective signal then deter:

mines.whether the trunk-signal shall be displayed at the, home division or some other ,division and at which. The trunk-si als 6p are treated' by the operators as the ca ing- Signals-of subscribersto be answered-and the r attended to; and hence after inserting a8 a trunk jack m response to acall-11f,

a connection. .therew1 th the operator '6 the jackof-t e wantedline andto complete the connection. This she cando,"for the call has come to the division where the wanted subscriber-has a connection in a -multiple 7o" jack for each section therein. V v At-the subseribers station'ithevapparatus is ve simple. I have shown itras" apair of pushuttons'witha reta' -magnet'which when a button is; depre'ssed' olds it in' and 75 the otherbuttonbut' until thecall'is finally I extended totheoperaterre' aired and there answered. v The 1 special ca ling? apparatus 7 and 'push-buttons are then out out auto? -mati'cally','so that nothing remains in the cir- 3o cuit except the .ordinarycominon battery j lineT-relays, .f or annuneiators, "and line lamps telephone. By means .whioh- -I "shallllnot specifieally' claim herein ,the number 'of di give alfilll' size" tone hundred thousand sob-.

very s lar stvaexc ange new fin-o eration."" o.. By fiififi angef hi'swqnnet'ion do. notfl which together {interchange business. and" 1 -thereby combine toserve alispecifiedxgroup -of subscribers; under one, :GOnbIf Ol. Thus there maybe ten exchangesin the narrowei' it sense, constitutingten divisions. according to 1 niy present invention, scattered through ferent parts of acity, but all commonly cone io'o trolled and working underthe same rules and In such case thfcal-ls may be i tainty 0 operation as if the divisions. we

under one roof, and thebo'ardsside by side."

If the exchanges individually be v widely;

separated-say more than twentyvehn n dred feet apart-a combination of;

wires may be required tosave the three-wife Q extensions, only as many triplets. beiag' fi .a latch controlled. by a magnet D use at once, allowing for peak hours and for spares. This, however, 'as well as the other problems I have mentioned above, need not be discussed at length herein, as they will be fully treated in other specifica- My present i vention is illustrated as to one embodiment inthe accompanying drawings, wherein-- Figure is a diagram showing a subscribers station connected to one division of a divided multiple switchboard, and the trunkterminal circuits tlicreat, as well as atrunk extension to another division. Pig. 2 a similar and synnnetrical diagram made as a continuation of the first, showing the operators" cord-circuits and a second subscribers line and station outfit, these appertaining to a second division of the mritchboard.

Referring to the drawings, A, in Fig. 1, and A, in l ig, 2, are subscribers stations, each provided with the usual talking set of a common battery system and each provided, also, with selective mechanism by which the divisions of the exchange may be. di'll'crentiat-ed. As all this at each station is the same I shall describe that at station A alone.

At station A, 'l is the transmitter, .lt the receiver, ll. the switch hook, C the condenser, Q theringcr, all of usual or any desired type.

I) and i) re two push-buttons, (shown of insulating material as to heads and shanks) although the latter may obviously be of metal and in practice would be so. Each button has contact-spring (Z or cl, normally back on a lixed contact, these two lixed contacts being in the'circiut 34 35 ot the talking set, so that when either button is pressed the talking-circuit is broken. I have not chosen to complicate this diagram by showing anything but the essentials; but in practice I may, and prel'erably will, make a nun'iber of changes entirely within the scope of my invention, which will do awaywith the disagreeable click in the recci-verll Each button when pushed iuis adapted tobe held in by For the button Dthis latch is-shown as a toe on the. end of the armature-lever d", and for the button D it is shown as a similar toe 0d the ar Both armatures are conand of course llach latch holds its button when pushed in. and also prevents itsdieing so pushed in if the armature is up before the pushing 1s cssayed.

This prevents tan'iqrering with the signal al'tcr it is set. Iheu the button l)is pressed, it grounds the side 2 of line through the u'iaguctx l)", and when the button I): is pushed it similarly grounds the side 1 offline through the same magnet, each, as l have stated, orcmng the talking-circuit and leaving the other side oi line ungrounded, At the con battery B.

tral-otl'ice'eiitl of the line itpasses to the contact-terminals m and m (:l' the cut-oil relay .M. Thencenormally bothsidesollinepass to the magnet ll of the limva'clay, controlling the signal min the local circuit (5 5 3 from Hence no matter which side of line is grotu'ided at the subsrationthe linerelay I will get: current through the relay 1)" and line.

Each line has a terminal answering-jack J and nuzltiple jacks .l. l): :h jack has the line-terminal springs j j and a thimble j". The thin'ibles are all connected togcthm' by wire it) and through wire 7 tothc c. t-ollrelay M and ground. 'lo cooperate with the line-jacks, I preferably provide only the trunk-plugs P for answering pvrposes, and in practice it is desirable to have the answeringjacks J and the trsnk-plv s l bclore one set of operators, whose sole daty is to stick plc'gs and withdraw them according to thc s' uals, the,tranlejacks J" J and the coL'af- (wits (shown in Fig. 2) being before another set of operators, who correspond to the present subscribers operators. The pl g l" has a tip, ring, and sleeve 7) p 1) the tip and ring forming tern'iinals of the main track-wires 11 12 and the sleeve the terminal oi'thc relaywire 13 passing to relay L and batter The wires 11 1.2 have extensioas Hi 17 passing to both divisions of the switchboard, (which in this case is supposed to be a twodivision' board.) At each division these trunk-wires terminate .in an answering-jack J or J, having springs similar to those of the line-jacks, and thimbles j connected together by wire 15 and thence by a branch to to the trunk .eut-ofl relay M and battery. The relay L 'controls, through its arn'iat'ure m, the circuit 14 m of the lamp m which iS' atonce the supervisoryand clearingout signal of the trunk. The ainiatnre m" is controlled by the trunk ci;tofl'relayi\l whose other contacts m m? control the tir iitsof the trunk signal-relays L U. ()l these the former is connected from the tri nk-wire 16 through the cut-ofl' contacts on to the battery by wire 16 and the latter, If, is similarly. connected from the wire 17 thro gh the eut-oll' Contact-I mi t0 the wire lti and battory "lhe grounding of either side of the line will therefore energize one of these relays. For a purpose presently to be rci'crred to the wires 16 and 17 are reverse-'1 bctweerrthe jacks .l" J" and toone side oi the oi'incctions of the relays l/ lfiinthiscase on the side toward the jack J. Cooperating with this trcnk-circi'it and with the 'line-circ'l it dcscribcd I may employ the cord-circuit shown in Fig.2. llere the pl'z l l are connected by the cord epnditctors Z1 22 2" 24, condl'ctively separated by the condensers C (1 Upon each side of the condensers a bridge is l'orn'ed'across the cord inch ding the battery B, this being shown, in the one case, at 25 26 and in the other at 27 inserts a plug P, whereupon ing of this lamp would mean probable trouble with the trunk, and another trunk would be substituted promptly therefor.

Detaileddescription of the operation of the parts iirl ig. 2 is thought to be unnecessary, so lv will merely refer to the reason for reversing the conductors 1.6 17 on jack J. It will be observed that the battery B,.in accordance with standard. practice, has its positive terminal grounded. if both trunk-jackswere. directly connected to line, this would bring the ground on one side or the other, accord ing to the jack selected. ill" the cord-circuits are uniformly connected to battery--that is,

28, the bridge containing the su ervisory relay S and the chokecoil Si, wiiile the second contains similar pieces of apparatus S S. The supervisory relays, respectively, control the two supervisory lamps s 3, whose circuits, open when the plugs are idle, are closed in use by the re laysL L connected to the sleeves of the respective plugs.

"he operation 01? my invention thus described is as follows: Subscriber A ,desiring to converse with subscriber A, ascertains that the number of the latter is such that he isv in a dili'erent division 'lTOlil his caller. ll"

we assume A to be in the A division and A to with the sleeve side always to the live side oi be in the B division, (which may be the battery for test purposesthe result would be. marks on the buttons,) the caller would then that the two grounds, one at central and the press his B button. in doing so he closes the other at the substation, would both come onv the same sideof line. for one jack J, but would come on opposite sides of thcline and battery for the other jack J. The result ol" this would be. that for all connections on jack J the relay 1)" at let go. ,llence I. simply reverse the conductors 16 17, as shown, and thus bring the two grounds always on ti o same side of battery alter the operators ilug l. is in any trunkfollowing circuit: ground, relayl), contact d 11, 33, 11, 5, 3, 19, B. Both the linc-relay andthe relay I) pull up, the button 1) (which we have called the B button) is retained in its depressed position, and the lever d is drawn up behind the other button to prevent its being de )ressed. The operator in Fig. 1, perceiving t ie line-lamp m to light, circuit through the cut-off relay is formed as follows: ground jack. The test of course unnecessary to to relay M, 7, 1 p, 13, L, It), B. Thecutconsider, the trunk-jacks are only answering-jacks. It would be all right, however, in any case, provided the relay M were grounded instead of to battery and the relay ll to battery instead of grounded. This is a mere reversal of connections, which is always understood. where necessary;

It will be apparent that while I. have thus described a two-button substation and a twodivision switchboard the same may be made four or eight or sixteen by any suitable method, and. 1 contemplate all such changes as within the scope ol" the appended claims.

1 am aware that sundry changes may be made in the apparatus an circuits 1. have described without departing from the spirit of my invention, and IV wish it distinctly understood that all such chan es are well within the scope and purview a l my claims.

feature of my present inventrunk-lines between oil relay then acts, and at the same time the potential of the test rings or thiinbles 7' is raised for test purposes. The eut-oll' relay draws in its armature connections so that they make contact with. the terminals of wires 8 and .1 before they break with the terniinals leading to the relay 1.1. The reason for this is that there must be no break in the llow of battery-current to line until the answering operator finally makes connection. The line-circuit 1 2 is now continued through the trunk wires 16 17 to the multiple 'acks J J in the two divisions ol the board. The ground remaining on the wire 1 at the subscribers station, current ilows'through the relay 1. by the following pathz'ground at the substation to relay I), contact (i d, 33, 1,111., 8,'j,p, 11, m, L, 16, 19,13. The relay ll therefore pulls up and lightsv the lamp 171. at the B board. The operator at that board, using the cord-circuit shown in Fig. 2, answers the cal-l and handles the connection exactly the same as it she were dealing with the subscribers line direct. As soon as she inserts the plug P, however, in the jack J she closes circuit through the trunk cut-ofl' relay M. fby the following path: ground to relay L, p, iyof jack J", 15, 16, M, 1.6, 19, B. This relay then pulls up, well as the relay L", the lamp-relays i L", which were previously bridged across the trunk, being thereby removedand the lamp darkened. At the same time the lamp m, which lighted when the plug 1. was iirstinserted, is put out,

The essential tion is the provision of changes, the trunk-lines containing selective apparatus by which the subscriber may dif' ferentiate, soas to select the particular exchange or division of the switchboard upon which his wanted corres ondent' has .a'terminal and can be reache My. invention has beeiidescribed as applied to mai iial multiple switchboards only; but it may obviously be applied to automa'tic or semi automaticsystems and to transfer-boards as well and without change in essence. Such applicationl consider .within' the skill of any telephone-engineer well in- .whicniiulicates to the {last 0 )erator that the formed in his profession. y y call is being attended to. ontinued burn- Having thus fully described my invention,

the substation would never aparate multiple boards or separate exwhat I claim, and desire to secure by Letters Patent, 15

1. In a telephone-exchange system, aplu-- tribu ted upon different portions ol its division,

trunk-lines containing selective apparatus extending unbroken between said (llVlSlOIlS,

boards, or exchanges and means by which a subscriber may affect said selective apparatus and dil'lerentiate so to manifest a particular trunk-signal at the particular division upon which a terminal of the line wanted is to be found and no other, substantially as de scribed.

2. In a telephone-exchange system, a subscribe'rs line, a controlling .lay, means at the substation for grounding one side or the 1 other of the line tln'ough the controlling-relay, a line-signal at the central office displayed in response to the subscribers act in .lcalling, a trunk-line extending to multiple terminals at a plurality of switchboard divisions or exchanges, selective relays connected to said trunk-line, means .to supply current thereto and to the line, and signals to designate a particular division or exchange wanted,controlled by said relays, and responsive to the grounding of a snbscribors line, substantially as described.

3. In a telephone-exchange system, a plu rality of subscribers lines, a central ol'lice, a plurality of centraboilice switchboards each contaii'iing answeringterminals and multiple terminals for a particular group of said lines, a telephone set at a subscribensstation and a signaling set thereat comprising a circuitcloser and aretaining-magnet therefor, a linesignal device normally connected to the line at central and associated with the answeringterniinal thereof, together with trunkdines extending between the switchboards, and each provided with a connective terminal upon each board, signals associated with the said trunk-line terminals, one for each, and circuit-closing devices for said signals normally connected to the trunk to be affected by the subscribeis circuit-closing device so as to display. the particular signal desired upon a particular board of the set, containing one or more multiple terminals of the line;

wanted, substantially as described.

4. in a telephone-exchange system, a central service-bureau divided into a plurality of switchboards or exchanges, subscribers lines.

4 each terminating at one division only; trunklines less in number than the i'iuniber of sub scribei's l nes and extending between the several exchanges or divisions, each trunlehne having connective terminals at two or more or said exchanges or div1sions;a plurality'of each trunk-line, with means to supply current thereto and to the lines, and signals associated said relays; together with circrut-controlling devices at each subscribens station arranged to cooperate with and alfect said relays; whereby a subscriber. may signal his own division for aconnection, and being trunked imay selectively signal an operator at the division or exchange in which a line wanted is terminated, substantiallyas described.

5. In a telephone-exchange system, a divided switchboard and subscribers lines each posed of two wires both normally connected to a line-annunciator at the terminal division; a'pair of circuit-closers and a locking magnet therefor at the subscribersstation, whereby one side or the other of the line may be held groundedat will and the line-signal thereby set; a trunleline between the divisions having two wires each connected to a generator and ground through suitable relays, trunk-terminal signals at the different divisions controlled by said relays; and operators connective circuits in each division; the whole so arranged that when a calling subscriber is trunked his line-signal is disabled and the trunk-relays brought under the control of the line to set one of the trunk-signals at the predetermined division; and means whereby an operator at the desired division may eomplet-e the connection between the trunk-terminal and the line of the wanted subscriber, and in so doing may disable the trunk-signals, and in finally brcakii'ig the connection may actuate a trunk disconnect signal at the calling-subseribei"s division, substantially as described.

6. In a telephone-exchange system, a plurality'oi subscribers stations, a central station, and a plurality of switchboard devices each containingterminals for a particular group of the subscribers lines, a plurality of trunk-lines extending between the switch.- board divisions, a common battery supplying current'for the lines and trunks, a plurality of terminals and associated signals for the trunks, the same being distributed on the several boards or divisions, and a controllingmagnet for each signal connected between, the battery and one or the other side of the trunk, together with means at a subscribe'rs station for determining the flow of current from said battery throughone' or the other side of the trunk, and thecorresponding signal controlling magnet, substantially as described.

7. In a telephone-exchange system a plurality of subscribers lines and stations, a plurality of central-otfice switchboards with.

answering and multiple terminals upon each selective relays connected to opposite sides'of with the 'trunl -terminals and controlled by terminating in one division, each line com board for a articular group of subscribers a tru -signal associated with each terminal,

and a controllingmagnet therefor, a plurality of separate circuits composed in part of the members of the trunk, and means at a subscribers station to complete one or another of said circuits, at will, so as to display a desired signal,substantially as described.

8.,111 a telephone-exchange system, a sub- 1 scribers station having selective devices, and

a'central switchboard divided into distinct parts, together with trunk-lines normally extending'unbirolien to all the parts, and means whereby the subscriber 'may set a signal therethrough on any division of the switchboard, substantially as described.

9. In a telephone-exchange system, a subscribers line, a talking set therefor at the subscribers station, and a signaling set comprising a circuit-closer and a retaining-magnet the'r'efor, a line-signal device normall connected to the line at central, and a ternnfinal connective dovice,together with a trunkline extending iinb'roken to more than one division of the exchange or system, and pro- I vided with a connective terminal at each,

signals associatedwith said trunk-line, one

; for each terminal, and circnit closing devices for said signalsnormallyconnected to the trunk to be effected by the subscribers circuit-closing device so as to close the circuit of any particular signal desired, so as to selects particular division of the switchboard, snbstantially as described.

10. In a teleplioneexchange system. a plu-- rality of subscribers lines and a plurality of central ofiice switchboard divisions, with line-circuits extending from the subscribers stations to the said switcllboards, each line terminating upon less than the full number of boards, a number of line extensions or trunlv lines passing unbroken between the several switchboards, each having multiple terminals on the said boards and signals associated therewith, all of said trunks being n01.-- mally disconnected from the lines, a calling signal for each line, and means for connecting a line when calling to an extension ontrunlt,

together with means at the subscribers sta tion for actuating one or the other "of the signals associated with said trunk, according to the particular boardupon which the line of the Wanted subscriber terminates, sub: stantially as described. i

in testimony whereof I have aflixed m y signatsre in presence of two Witnesses.

v EDWARD CLEMENT.

iillitriesses:

H. M. STERLING,

G. M. QOPENHAVEN

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