US586685A - Telephone-switchboard - Google Patents

Description

mo Model.) 3 Shets-Sheet 1.

H. V. HAYES. TELEPHONE SWITUHBOARD.

No. 586,685. Patented July 20, 1897.

JHIINIGIHIIIIMQ' 3, Sheets-Sheet (No Model.)

H V HAYES TELEPHONE SWITGHBOARD.

Patented July 20,1897.

(No Model.)

TELEPHONE SWITGHBO'ARD.

No. 586,685. Patented July 20, 1897,

E. 9: v familial," 5 mm 0 4 ,14 fi\/* g 3 Sheets-Sheen 3. H. V. HAYES.

UNITED STATES PATENT OFF CE.

nAMMoND v. HAYES, F. CAMBRIDGE, tinssncnusnrrs, ASSlGNOR ro THE AMERICAN BELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.

TELEPHON E-ISWITCH BOARD.

SPECIFICATION forming part of Letters Patent o. 586,685, dated J uly 20, 1897.

Application filed January, 1897. Serial No; 621,168. (No model.)

1''!) all whom it may cmwcrrw Be it known that I, HAMMOND..VINTON HAYES, of Cambridge; inthe. State of Massachusetts, have invented. 'a' ln'ew d useful Improvement in 'Ielephone-Switch cards, of which the following is a specification. H

The invention is appliedtoa'telephoneexr change system known technicallyas'a meascred-service system; and-its objectiis to pro-- vicie suitable means whereby all calls fofconnections sent in from a telephone-substation and answered by, tl1e operator at the tele-' phone central oflic'etnaybe automatically recorded and whereby calls sent in 'fromthe suhstatiom-Which for any reason are not answered "bythe ope'rator at the central oifice; shall not afiect the-record. To make arecord the concerted action of the operator and the subscriber is required an lprovision is made that no-unaidcd act, eitheron the part of the subscriber .or of the operator at the central office, shallfbe capable ef affecting-- the record. Thus only such callsas the subscriber may be justly-charged'for'can belre': corded, and noopportunit'y is given either to the subscriber or to the operator at'the cen:

tral office to falsify the record'by the manipulation of their apparatus; v

, For the purposes described above I asso: cate a recording mechanism or counter with the substation-line at a convenient-point within the telephone central offlce, the mechanism being so'constructed and associated with the substations circuit within the switchboard that it can only be caused to make a record by the cycle of operations-whichresult when a signaling-current is-Sent in over-the line from the snbstationand an operator at the central office switches intojthe'circuit toanswerthe call. 3y theinvention existing telephone systems may be brought under the measureghservice' system-that is, the invention may be 30p" erated in connection with .widely-difierent telephone systems. For instance, it is applicable to the old systems, in which each sub station is provided with a separate local bat-- ftery for the supply of current to the'trans-- initter, and where' the subscriber sends in his calling: or disconnecting signal to, the central oiiice by operating by hands-local magnetostood.

coil 1'. .Tis the telephone-receiver.

zgcnerator. Itis likewise applicable to the new system, in which the current necessary for theoperation of the substation-transmitters is supplied by a common centralized bat- 5 5 tery located at the central office and in which all the signals are entirely automatic.

The circuits and apparatus by which the invention is carried into. effect are best de scribed by having reference to the accom- 6o panying drawings.-

I Figure'l is a'diagrammat-ic sketch of circuit-s,illn'strating the application of the inventionto a branch-terminal multiple switch- :board in the old system in which local trans. 6

mitter-batteries are {employed and in which the'calling and disconnecting signals are not operated automatically Fig.2 is adiagram mati'c sketch of circuits illustrating the appli cation of the'invention 'toa branclrterminal multiple switchboard 'in a. coinmon battery system with automatic calling and disconnecting signals. Figs 3, 4, and. 5 are draw ingsfiillustrating the recording device or counter and so much of the electrical; mechanism by which the re'cor'dingff device or counter is operated as {not 'sufli'ciently shown in the diagram sketches at Figs. 2and 3, the said Figs. 3, 4, and g5.being-,-respec-a 'tively; as relative to'each other, a rear, a side,

and a front elevationi o So far as practicable the same lettering is 'followedin the different .figures.. Any departure from the rule will belreadily under- 8 In Fig. ,1, A is-a tele 'Jhone-substation connpcted with thecentral office-D by the line wires (1' and a on metallic circuit. At the substation b is a local battery for the supply of current-moths variable-resistance trans 9o mitter M. 11' and s" are the primary and sec ondary helices of the transmitter inductfisonis the gravity or hook switch; Gisthe'hand magneto call-generator,.of which 6' is the automatic cut-out, and .B is a high-impedance call-bell in a permanent bridge across the line. At the central 'oflicegthe substations .line is continued through the switchboard,-

past the various in ultiploseotions, by the wires d and dfi'and is closed throughthe operht- A in g-winclin g 9f anelectromaguetic'annuncia connected, by means ofthe "wt-em, through the restori'ng-windin g u of the electromagnet 'EQ-andby the wire n to earth G through the second or releasing magnet 17 of or associated with the-callregisteringrdcviee or counter F.- his a lamp line-signal. b s the line-signal battery, axis the first 1nagnetof trolled by the grayity-shutter of the electromagnet E".v -In the lower part of this figure is shown the ope1'ators-.cord,- which bonsists,

-essentiallyyofthree wires f,' f and f terminating, respectively, at bothends in the contact- surfaces 1, 2, and 3 of the cord-plugs P and P, and the wiref beingconirected t0.

:fthe ground G throu 'h the batterybh v It now a call-sigm be sent in over the. line 5 from the substation, the-generator Gis operatedu 'Thc contact'e' is therebyautomatically closed. I A signaling-current passes-from-the generator-over the circuit ad'E d a e'. This current passing through the operating-windingof the electromagnet'E causes it's gravityshutter tof all, thereby closing the circuit of the'line-signal battery I) at thepoint e. This.

causes the lamp-signal L to light and'at-tracts the attention of the operator to t-hecalh -The closing-of the circuit of the battery?) at the, point e" also causes a current to flow from the battery through the winding of thefirst mag-.-

net .2: of' orv associated with the call-registermg device 1 The passage of this'curre'nt its armature, thereby setting in tension '21 small spiral spring, ;(see s", Fig. 3,) which-is maintained in tension after the armature of the magnet 42: is released by a click or detent.

which engages in aratchet wheel. This ratchet-wheel is itself held stationary by a detent attached to the armature of the secondmagnet y of F. The details of this mechanism are shown in Fig. aand are explained hereinafter in connect-ion with that figure;

'1 When the operator sees the line-signal L light, she inserts the answering-plug I? of her ,cord in the jack of the substations line, which 1 is at her section of thegboard and which is 5 plug-contact', jack-contactgfi, wire m, restoring-winding w of electro'magnet E,. wire 0 n, winding; of magnet y, to ground G. The

passage of the resulting current fromltbe bat- I teryb through the restoring-winding'w of the magnet E draws up and restores the shutter Ita'cts 4 'of the line-jacks are connected by the the callq'egistering mechanism 'F, and e is a con-tact normally open and which ais1con-- knownIas the ianswening-jack. j A result of this act is to close a mficuit extending from the ground G3, through thnlbattery I wiref,

throughthe magnet wIcauses. it to draw up step and register an" answered call.

contact e and e.

through the relay E, to the ground G and 'by the click or detent and ratchetewheel already mentioned. "lhef passage of the result ing current from the battery b through the -winding of i the second magnet '31 causes the armature of this magnet to be drawn up, dis-j engaging the d'etent-catch from "the ratchetwheel, thereby releasing the mechanism of the call-register, which; oiving to. the tension in the spring, is caused to move ahead one I As long as the plug of theopcrator remains-in the' subs'tation s jack a current from the battery I) flows through the restoring wiuding of the. electromagnetE, keeping its shutter drawnup and the circuit through'the magnet a: 8 I

epen. Inconsequence of this'as long-as the operatorscord-plug-isin the jack the mag-1 net as cannotfbesinfluenced by-any currents sent over thesubscribe'rs line, whether these currents be calling or disconnecting-signal 6 j currents. Therefore, when I the subscriber has obtained: thedesired connection and completed' his conversation he sends in his dis} 4 connecting-sign a1 Icurrentin the usual way by operating thehand vihagneto-gejnerator G without danger of operating themagnet'm of his call-register.- 'lhe operator at the central office seeingthedisconnecting-signal with dra\ vs" her cord-plugfrom the substationisr linej'afck; This-:re'moves the battery b fronaf tool.

the circuitof the magnet 1 causing it to release its armature;; -which returns to its nor- .mal position. The mechanism F is thus re stored toits normal position, in which it is another call when made nude ready to record answered. a a

I n Fig.-2, A1is a subscribers station connected with the-telephone central office D by a metallic circuit composed of the wires a. and a 0. At the substation Bis the call-bell. S is 1 1c the gravityhook-switch. Mis the microphone or-variable-aqasistance transmitter. '1" is the telephone-receiver, andG is a ground. The circuit is -contirriled' through the switchboard by the wires d and d and through the contacts e and e to the battery I) MIG: line-relay E. 'At each multiple section of the switchboarda branch-terminal jack is-permanently bridgeduthese'jacks being shown at j, j, and "ff L is the lamp line-signal. b is the linesignal battery, 4 e is a normallyjopen contact which iscontrolled by the line-relay E. E is a relay which controls thenornially'closed- 1 The outermost contacts" 3 of the line-jacks are connected by the wire m,

through the wires m and n and the coil of the second magnet 'y,'.of orassociated with the call-register F, to'the' ground G. The conu of this ele'ctrqiuagnet to its normal position. i wires m and m", through the battery I)", to the tery b at the point e, thereby extinguishing US represented the o erator.s,cord,-consistin 'thc lam liue-signal L and. releasing the arofithe two wires f an This opens the circuit of the line-signal batg ground G. In.- the lower part of this fig t? Mimi nating', 'respec-' tively, at each eml in the contact-surfaces] I and 2 of the cowl-plugs 1"mir1*1-'.-- The conmet-surfheliws eurl 43 of the cord-plug P are connected togelher and byt-lie wire f through the lamplliseonu(acting-signal K through thecontact (2 iolihe. ground GT. 'lhe'feontaetpoints 5 and 6 of the eor'chphr-g 1 are connected. together and by the w i re f through the d iseonneetinglz-rm rsig'nnl K and contact 6 to the ground G. The eoul'eebpoints 5 and G of the plug: 1 are also eouneeted through a tertiary.-

wirilling of'the operator-sincluetioireoil I,

end through a shmll retardation-coil L tothe ground .6.-

Zfi is the eommon transmittereurreut-suj'iply buttery pernm'uent'ly bridged hetween the wires f'hn'd f of the op'eretore eor(l'cireui.t through the, two windings of a retarlhilion-eo il lt. QT is the 'ope'retors teiephonwreceirer; M is" her trnuu-iieter; if, her trunsmii-i er-lmttery 32 and s, the primary, and sex-mulory rirulin of herincluetiou-eoil :i,*:tn l. is a eoudeuer. E 'ehtl fl 'are elee- Moreno-1lelie'reluys which eontro'l'the contacts (f and 6", already mentioned. In this system when the subscriber-wishes'e connection he removes his telephone from thehook-switeh, which 2 utomatieally eloseshisei reuit thro ugh his, l mu Sill itter and receiver. A-eurrent then flows from the battery I) through the contact a, the switehhourd-wire 'd', the line-wire a, trousinitter hl, receiver T, hue-wire}- switelzhoa-i'al wire (Z contacte,j winding of eleetrou hgn et E, and back to the other pole of. the battery Z51. This ourreutenergizes the "elect roin guet E", which, 'by rttraeting its to the feet time thesiiberi her wishes. a con .heetiou by lhe lighting of "the linesignnl lamp L inserts the answering-yflug P in the suhstatic'm line-jock, ihe'eontaet-strip 5 of theplu'g being thereby eeuseglto short-eireuit the coutuet-point'fi itgrdil .ee the jaek. A current then Iloirs from the ground G in Series through the battery 1), wire m5, Wire} 111', Contact lot jack, eoutaei pstrip 5 of plug,

confirm-'53 of jack, wire m, and in parallel toee'rth G'fhnrl G, respectively, through electromu-gnetfll and eleetronuignet 3 Tlheyesult of the *eurrent .fromj the'hettery b passing through the magnet 15 is to cause it/[o drew up its two arnmtures and open the circuit of the battery I) at the two points a and a. The

current from the buttery 7)- whieh was flowing througlvthe wim'lings of t-he magnet 13' is lines.)

en gage.

therehyinterru ired, ind as it reshltthe armotore or the magnet E is released and the circuit of the battery 11 through the lamp line signel I; and through the first magnet 3;,Iis'

The cessation of the" current through the line lmup sigual extin 'guishes it and 'theeessation' of the current open at thepoint 2.

through the magnet weauses it to release its armature. [The passage of the currentfrom the. better y hthr-oughthe coil of the magnet- 7 causes it to attract its-armature-thereby withdrawing its detent-eoteh from. the f'rat'eh eta-"wheel of the recording mechanism: aemorefully-ehov ngin; connection with FigLB'; This permits the ineehenisni under the action of tlrelspring s Fig'f3, plaeed in tensiorr by th niovemeht-o't the armature of the first'meg-J. net-w, tobemovecl {lllQldOljlG-Sllfill and record enh'usw'erecl Cell. When the connection is. no longer'required, thesuoscriber hangs hi reeeiver'u 'xhi the gravity hook {switch S, thereby opening his circuit. Thiscauses'the eleari ug-out sigiml-lmup K to light, and the operator. seeiug' the signal Withdraws her coral-plug from "the vsabetaliieus, line-jock. Thie-ziet opens the circuit oflheb-attery b at the contact-point -;l of the suh'eerihers jut-k,

therebydeeuergiziug the line: rela'y-mag'uet' E and the magnet The iur-rguet- 3 releases its axe-naturqthe mechanism and looks it. The umguetlfi re lea-sesfits"ernmtures, which close the suh serihers switehboaitcl{eh-Quit through the electroma iiiet l5 and battery I)", but since the subserihereliue is o'pen at the suhstz'uiou'the magnet E remains deenergizecl, f lu- Fig'. 3, hand y are'the two eleetroinag nets \r'liielilmre'beeu referred to ahove as FlSSOClRLOClWltlI the call-register mechanism and also as, the first and second magnet, respeetiyehy. I y is the armature of the magnet u tl'CiGllt'CPll-cfi of which en-l Igogesin'the ratchet-wheel 'ol' the recording 7, and .r"the armature of the magnet- 'lh e nrnmtures are shown in their nornml posi f Helm-but, when the magnets are energized the armature 11: ie'drmvn into contact with ore 'p'ole lf'of the magnet :0 against th'eli etrz e'tileforee of ihe spir211 'spri n s and the armature j ieclrawniuio contact with the pole I'-" of {he nm-gnet yagninst the retraetile force of the spring 5. 'lhe urmnturem 'ear lies a leg- Z, attached to its extremity, which leg terminates ill 21 foot (1. The spiral spring" is deemed atone extremityih theiusugrl manner at JL-while the other extrenaity attached to the disk v1),

rotate on the shaft 5 it uotbeing rigidly ettaehed't'o the shaft. It carries a click a, re-

-stored by the bent spring 3 The foot-(Fol? (Shown in dotted This disk is mounted en-d'is free to l the leg Z, attachedtothe armature .r', engages in a'--l.1.-iaugular;slot out in the periphery of the disk D: On the same shaft 5 is rigidly mounted it ratchet-wheel W, so that it'ean only revolve with the shaft. Into the Teeth of this \VllO-Gltl18'(l(\COllt-Cfll3Qll d and the click The shaft 5' connects with the reg; is'teriug mechanism, lfhe re?'olu't;iou--offl 3 5 tion, (shown bythe fnlllines), andin doingso shaft.si'ootrespondine to e :eircumferentiai displaeement of the ratehet-whee1 equal 420 su-flieient togreeord an answereilcalln;

the width'o'fone tooth being necessary-end,

glows The lmagnet a: is energizeq when the suhseribensends in hiseall. 3 This d-mws'pp' ,the r erni-aturewfto' the poleP-SI of'the magnet;-

- ma ing t erllee t e-the,i' g t- :Th ot n- Letthe I egZeeu'ses theheel It QfI vth'e foot (195, at.-

zte hedz te h sl gyt pi s againsti the urfa e ogfi the trjengglar sjlqtiin the disk D; against i no any rests In; sp Se, to this I messnne hed kz e e yes; cen yi'ne' b k h mtchetwheeltWi as. show-1 y he e e contact withthe second snrfaoefot the -t1 -.ia, n 2o g'ular slot in the disk 1).. ,flfhe motion ot-t-ire disk D pujts in tension 7 the spiraLspring'sfl'to 1 are new: free; to. move adistanee correspondin tothe widthof one tooth of the wheel,

v )i'ard movement, of the click is limite'd'to that of one toothofthe ratchet-wheel by the moi-.

which it is attached, and this .tension is main I fainedeven after the armature to is released fast by the detent-cateh d I Inter plugs into answer the call, the magnet :1; is deenerg ized, while the magnet yjis ener gized. 'lhe-resuIt of this is that thearmature m'is re1e2tsed ,whereas y'yis drawn upto the, 1' polemeet-$1 by-the' magnet :17, owing to'the I click Qbeing engaged in the ratc het-WheeLW YWhieh is held The armature yearries with it the detc'mt-c enehld? andthereby releases the retohet-wheel W and shaft 3?. The spring e being under tension restores'".the disk D and its associated-click c to its normal posirevol v es the I ra'tohet' wheel and shaft, which thus registering an answered 08.11. This for 7' t ioli'ofthe' foot d, which in; turn isIlimit-ed I v by the leg I oom'ingf in contact withthe back: 1* 45 It is-to he obseriied that for theoneration of the mechanism- 11. e., in order, to cause. it

ltoireeord'anenswered cane-the concerted aefionbf the subscriber and thefoperavtor ztt the eentralt oiifiee is required; since in no way can the energizing of either onefof the magnets a:

' -or 1'a1one-c.at1sefthe shaft S? tolrotate; and

Y registeren answered call.

'\ In FigsYt-end 5,}S.is the shaft, already me lttioned-v in conneotion-withFig. 3, which,

- conhectsthe ratehetwheeHV with the indexpointers P, Pfi-Pinndlf, that indicate the When the pe, 1

dredt-h of theidivision Qn' the dial-D and the tion with a snbscribers l ine-eenteringthereat,

inlnding the subscribers line-signalv me eh-" anism, of first a. registering mechanism of'two registered eal lsfniioii thefiial's D D 51); the "D respeetive1y, e teh dial having ten -diVis ions upon'its face; The motions of, the shaft 8 ers: o'ommnnicated to the'spindles, upon which the pointers P'-,1 P, and? are rigidly mounted, bymeans of the train of gearwheel's w 0 and 101 re spec't-ively,whieh in turn are rigidly mounted npon'the spindles thountedthepinions 1*",1 v and 'u respeg- .tiVGIY WhiC-h engegewit-h the toothed. wheels I tethose on the eorresponding wheels wflfwf I A te w f and'wfl respeetiveiy/ The ratio of the number of teeth. on eaohpinion-v', '0 'andv andwi? isoneto' ten.

In the-operation ofth neelmnis'ni.a 1110-1- i'tiou of theshait S due to a circumferential displacement. of the' ratohetwheei Wtolg f" distance corresponding tonne of its ten teeth", willmovefthepointer P ahead one-of 'the'ten d ie ens t e ate t e vdi D th y reoqrding anenswered cell, "j'lhis moti'on iof the shaft s eeting'through the train of wheels deseribedaboyewill moyeahead the'bointen P eoneetenth of 'oneo f'thedivisions on the fajoe'of the dial D}; the pointer P one-hunpointer P one-thousandth" the dial D I I J Ic1ai'm-$-' e I. I-Ifn atelephone-switchboarci,the eombinar' movements; second an'eleetricztl mechanism the operation of which causes or permits-thefirst'movementof said registering mechanism to be taken,- while its own operation for such purpose is oensed-by the ioperationof :the

s hbscriberzslinegsignel mechanism and third an electrical}niehanisnr the operation of which causes or permits thes e eond movement of'said re'giste l-ing mechanism to be taken,

while its own operation. for suehpurpose is caused by the completion of the operetors answeringcirou it; the two said eiectrieel mechanisms being also so associatemthatnot only the infective operation ofthe second can- -not take plaoewithontthe previous operation of the first but the operation of theseeond prevents fnrtheroperationpf the first, substantially as described.

I VVitne'sses: I v GEQ. -WILLIs PIERCE, JOSEPH A. GATELY.

5 113, off, and 21:, respectively! Uponthesheft S and-the spindles u and ni are-rigidly roe I HAMi-ionnv; HAY ESQf

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