US1293597A - Telephone system. - Google Patents

Description

B. D. WALLIS.

TELEPHONE SYSTEM.

APPLxcAHoN FILED Nov.28, 191s.

Patented Feb. 4, 1919.

2 SHEETS-SHEET l- B. D. WMS.

TELEPHONE SYSTEM. APPLICATION FILED NGV-28,1913. LQQS' atented Edwin F919.

2 SHEETS-SHEE 2.

. distinguish `provelnents in BERNARD I). WILLIS, OF CHICAG, ILLINOS,

erfreut Tien im @il hitler..

ASSEGNOR BO AUTOMATXC 'ELECTRC COMPANY, 0F CHICAGO, ILL'LNOXS, A CGBEORATGN OF XL1-IN OES.

TELEPHONE SYSTEM.

Specieziton. of Letterslatent. lrerrtt, iii-Elli,

Application filed November 2S, lt. Serial No. 363,581.

To all whom. t may concern:

Bc it known that L' BERNARD D. illinois, e citizen of the United States of America, and resident of Chicago, Cook county. illinois, have invented eerteilnnew and useful lm- Telephone Systems, o which the following-'is a specification.

My invent-ion relates to improvements in telephone systems, und `more particularly to automatic or semi-automatic s vstems-thnt is, systems in which n connection 'is eslablished in whole or in part through the inedium of automatic switches.

One oi' the lfeatures of my invention relates to gsystem employing line switches controlled by n muster switch for selecting: idle trunks. n such system l provide meansjor preventing two or more subscribers who have removed their receivers from the swit'chfhooks while the master switch is rota-ting tofi'nove the line switches of a groin.;

lopposite en idle trunk from connecting with 4the seme trunk after the master switch stops.

Furthermore, I provide menusiwnerehy.y ii two 0r more subscribers have removed their receivers from the switch-hooks whileithe master switch is rotating, the line switches on these subscribers lines will connect with seperate trunks.

A. further feature ot my invention is the provision of means for giving en operator in n semi-automatic or manual system o. discriminating lousy test-that is, enable her to between n lousy test obtained from testing the multiple jack of the cuiling sulbscrihers line which is connected to the answering'end of the ope ntors cord in cuit, and a. busy test obtained from 'testing` the jack of some other suhscrihers line.

A further feature of my invention is the rovision otmproved ineens for discormecting the ringing current from the celled suhscribers line as Soon as the called subscriber removes his receiver from the hoch. Heren fore', when the ringing current was intern mittently applied, this current. could only he disconnected during the interrupt-ions oi' the ringing current. By my invention, howeverj the ringing;r Current is disconnected immedintely upon the response of the celled suhscriber, regardless of whether or not the ringing current is ut that time comici-ted with the line.

These und other objects of my invention will he more readily understood hy refer-- ence to the accompanying drawings, in which .i have. illustratedL one embodiment oi my invention in connection with n semieutomstic system employing line switches of n well-known typo und nn operntorls cord circuit.

Figures l and :Z teiten rtogether show n complete circuit connection between n 'culling substation A. und :1- cnlled substation A ein-- hodyinff` the principles of my invention. The connection is completed through the medium oi the individual switch C. cord circuit 0 und the culled subscriber-s individunl switch C" to the substation A.

Fig. 3 shows n modified forni ,of cord cir-- enit.

Referring to l? the line f 'onduetors 30 and 'Si of the su liers sulostution ter .urinate in the individuell or line switch C. ",lfhe line switch shown et C is one of e. group o'l similar line switches the plungers (not shown) of which engage u shnift nud ure controlled hy the operntion or' the nmster switch shown :it in such u munner th-.it they ure. when in not-nml position. held directly in ltrout of the terminals of n trunk line lending` to :in idle cord circuit i?. The cord circuit l is equipped with the uceessni'v nppurutus i'or completing connection with :my one of :t plurnlity of rsuhstntions (only one of which is shown) connected to the line Conductors 3'3 und 322 iihg. 2) through the medium oi the limL `switch C. Although there is shown only one substation A connected to the line conductors -l und 3?). it wiii he understood that n plurnlity ei" like suhstntions muy he connected to the seid lines. Thejringers ot the dili'erent substations muy lir'".\rranged in muy well-known manner to respond to the ringing current generated 'by some purtieulnr oncot n. plurzillty o' generators.

The subscribers substation A. is of any suitable or uppioved type und comprises the usnnl receiver 2., trunsmittcr ZBw switch-hook i, ringeL 5 and condenser l. The line een" ductors ci 'ih-e su'nl sul/slut:- termiimtc in the central exchange iu :.1 lil.` 'witch .ic cannluetms :rmi with tho indivi unl swim (i is the mul-.linie jut-lr j. through which vor ,ttions :irc es; tended to the suhstutior; A.

rlfhe prinnu'y line switch C is or the grenger su Wis imma?" sprl! milfs RH muy, 315cm is mmm:

he shzfnfifia" :513.

'is operated. y rlnglng circuit 1s a relay so constructed switches to which the line switch C belongs. The relay `59 is energized whenever its cor responding trunk 1s 1n use, Vhcn all the v trunks leading from said group become busy at one time, and therefore all the relays 59 encrgizech the relays 60 and G1 become energized over the .following circuit: 'from ground. Gr'15 through the Contact of springs 62 of each trunk relay 59 and through the said relays GO and 61 to battery' The relay 607 upon energizing, removes battery from the-pull-in windings ci all the line switches oi this xgroup. The relay 61, upon energizing', opens the circuit of the start relay G3 of the. master switch DL so that said master switch `will not operate until a trunk line becomes idle.

The trunk line seized by the switch C terminates in the cord circuit 0, through the medium of which the circuit is completed to the called line. The tivo ends ot' the cord circuits are connected together through the medium of the condensers it and 45. The cord circuit is also provided with the usual calling` 'and answering supervisory signals 47 and t6 and the necessary relays for controlling the saine. The relay 48 is a group busying signal, 2'-, e., it is a relay to make all trunks to an operators position busy as long as there is an uncompleted 4co11.in ction at said operators position. The relajtlll may be common to all the cord circuits of an operators position. The meter M is the means for registering all calls handled by one opera-tor. The reays 49, 50 andv 51 furnish means for giving a discriminating busy test whereby the operator canx ascertain "whether she is testing a multiple jack of the calling line con-- nected tothe answering end of the cord, or of some other busy line; Multipled through the springs 55 and 56 and 55 and 56 ot every cord circuit common to an opcrators position there is a conductor 541-, the function of which is to prevent the operators head set P being connected to more than one cord circuit at a time, if it so happened that more than one call was successful in reaching an operators position at one time. he keys KQ K2, K3 and Ki are the means by which any one of a plurality of generators (only one shown) may be connected to the cord circuit O for signaling purposes. The said .keys are so arranged that when any one of vthese keys, is depressed, any other depressed key will be mechanically restored to normal, so as not to allow two generators to be connected to the conductors -52 and at one time. The connection oi' the ringing current to the called line is controlled by the ringing relay 112, which' is energized when any one. of the keys K', K2, K3 or K* Connected in series with the and adjusted that it will not operatively energize when ringing' current from the generator ll. is transmitted through it to the called substation and through the condenser at the called substation to ground` but the instant the receiver is removed at'the culled substation and the substation talking' set is bridged across the line, the said relay 5S will receive sulicient current through the battery B in series with the generator 'll to operatively. energize.

The line switch C and the substation A are sinlilar in all respects to thcliine switchl C and the substation The cord circuit L' (Fig. 3) is similar to the cord circuit O except that the ringing of the called substation is started automatically by the operator plugging into the multiple jack of the called substation.

Havinglgiven a general description of the apparatus involved in the system, in order to give a complete understanding of my invention it will be described how the subscriber at the substation A. may obtain connection with the subscriber at the substation A. When the rcceiverat the substation A is removed from the switch-hook preparatory to making a call, the engagement of the hook-switch springs completes abridge across the line through the receiver and transmitter of the substation. The closurel of this bridge across the line establishes an energizing circuit for the line relay 14@ of the. line switch C. The relay 14, upon energizing, operates to close the circuit of the operating Winding 12 of the magnet 11, which, upon energizing, attracts 'the plunger arni- 10 and the cut-off armature 16, whereby the line `conductors 30' and 3l are extended through the line switch bank springs 17 and 2l and 2O andv2l to the cord circuit O, and the line relay 14 is disconnected from the line. `When the connection is extended to the said cord circuit O, the line relay 64, which is normally bridged across the line circuit of the cord O in series with the battery7 becomes energized Iand operates to close the circuit of the holding Winding; .l3nt the line switch C before the line relay 1s denergizes. It also operates to close the circuit et the trunk relay 59. The circuit for the holding winding' 13 of the switch C extends 'from ground G2 through the relay con t or springs 67 and 66 of the relay 64e, bare., springs' 22 and '1S and the said holding winding 13 to battery By. The circuit for the relay S9 extends over the same circuit as .tar as the bank springs 22 and from there it passes through the relay 59 to battery B. A guarding ground potential is also supplied to the bush 68 of the multiple jack j to make the calling line test busy. The closing of the bank springs 19 and 23 causes the master switch D to operate in a well-known manner to move the plungers of all the idle line switches oppositec'the next idle trunk line. A further result of the enersprings 122 and The key l locks in its depressed position (holding the contact or springs 11/1 closed, but allowing the springs 115 to close and then separate) and mechanically restores the key previously operated to normal. The rela)y 112 is energized as soon as the key l is depressed and operates toelose a locking circuit for itself through 'the springs 11o independentot the springs 115 at the key l. The said locking circuit extends from ground G5 through the contact ot' springs T3 and 101 ot the relay 91, lsprings 117 of the relay 5S. springs 11o and the said relay 112 to battery A further result or' the cnergization ol the relay 11.2 is to disconnect the calling line from the called line and to connect the generator to the called lino over the following pata: from ground (lo tlnough the coil 118, Contact or springs 119 and 120,

.rinfy contact oli' the lu f o. sirinrf 121 of ls .s

the Jack j, 'conductor 97 to and through the substation fr', conductor 96, tip si'ning5 of the1jack j, tip of the plug p', springs ano 123, relay springs 111i; of the key n', springs 124 and (when the. interrupter relayv127 is denergized) and the generator R through the battery ll to ground G. The 129 and the springs 12() and 128 are shunted by a very high resistance, or by a very sinall condenser. This allows a very small portion ot the ringing; current to be transmitted back through the calling line to the calling substation, thus. giving'the calling subscriber an audible ringing signal, informing bini tliattlie called subscriber is being signaled. il have `found that the high resistance may bc merely aline drawn by a carbon pencil on the .insulatingr mounting between. the said- Clpriugs, or the condenser may be the capac ell'ect of a pair of insulated vgires twisted together, one wire electrically connected to one spring and the otlierwire connected to the other spring. Either gives very satisfactory results. rlhe called. subscriber is signaled intermittently through the medium ot' 'the interrupter 140 and the interrupter relay 127. Should the called subscriber answer during the ringing period, the bridging` of the substation talking set across the line would cause the relay 58- to receive sutiioient current through the bat.- tery and generator inseries to operatively energize. 4The relay 58, upon energizing, opens the locking` circuit of the relay 112 at the springs 117. The relay 112, upon deencrgizing, disconnects the generator troni the called line ,connects the calling line With thc/called line-over the heavy conductors shown and bridges the relay 13,1 ,across the calledline. The relay 131, 'upon energizing, opens the circuit cgt the supervisory lamp 47 at the springs 132. Should the called subscriber answer during' the time that the interrupter relay 127 is energized, the rela-y 58 would receive euiiicient current through the coil 130 to operatively energize and perform the saine operations as above described.

The replacing of the receivers at the called and calling' substations signifies to the operator that the conversation is terminated. Vvhen the receiver at the substation A is restored to the switch-hook, the separation of the'hook springs destroys the energizing circuit of the line relay Gl. The relay (il, upon denergizing, causes the supervisory lamp 16 to glow over the following circuit: from ground (il through the springsI 73 and 101, springs 133 and 7S) and the said lamp to battery B. rllie replacing of the receiver at the called substation A opens the circuit of the relayY 131. The relay 131,'upon denergizingj, closes a circuit through the suporvisory lamp 47 over the following path:

-trom ground G" through the springs 73 and 101, springs 13:5 and the said lamp to battery B. The operator, upon receiving the disconnect signal, removes the plug pI from the jack j', thus breaking the circuit of the relay 91 and the lnidge-cut-oll' winding Sli of the line switch t". The relay 91, upon denergizing, opens the circuit-s ofnthe relays 99 and 65re1noves'the holding '.'round from the holding winding 13 of the line switch C and opens tlieclrcuits of the supervisory lamps do and 17. The holding windingof the line sWitclrC, upon denergizing, allowsthe line switch plunger to be returned to normal. 'The relay 99 is preferably made slow acting so that t-he line switch C is given suiiicie-nt time to return to noi'- rnal before the private conductor 104 iS again connected 'to the group busying relay common to the various other cord circuits.

The cord circuit L (Fig. as hereinbe fore stated, is similar to the cord circuit O, with the exception that the ringing,r is started automatically and not by means of a key. When a connection is established between the substation A and a called substation not shown, which may be similar to the substathe operation of the line switch C and the cord circuit L is the same as for ythe liz o switch C and the cord circuit O up to the time when the operator plugs the plug p2 into the multiple jack of the called substr tion. Vhen this operation takes place, the relay 135 energizes, as hereinbefore stated, with the saine results as before described and with the additional result of causing the relay 134 to energize, which, in the previous cord circuit, was energized by the pressing ol' the key K. The energizing circuit for the relay 134 extends from ground G through the contact of springs 13Gl and 137, springs 139a and 138 and the said relay 134: to .batt-ery B. The relay 134, upon energizbe ore described and. locks itself up over a .tion A, by means of this cord circuit L,

provi img Lw;

winni, the mailand Subscriber imswei'es,

"s his occurs dwing the ringing; pe-

512011 that hu devi. d Yei'y GGL menus; for giving the o! wlmi i. diff ng busy feste wher )y she mm (libu minimi-aim the busy tesi obtained fx'mil time miiilips; i( uf n line winmx-ted m fihi n cmi u wird und duit 0b fram testing 5mm other jme. iii: ha; c iiiustiiitfsii :imi i sixiffivi'isw'f'f lim :i iiiw switch individua mi mi,

wird

smi Einw., i A i'm cmwlimggg mail equipiiaem. iwA ihmu im: imm-: fui

im' www individua! in mi il sfcxmii i'liiilmiAh` gummi mii ' ductors for each line, a, s

controlling said magnet to con-ncct said line with any one ot' said trunk lines. :1 second line, a second progressively movable trunking switch for said second linc. an operating magnet for said second switch, a second liuc relay t'or controlling said second operating` magnet, and an energizing circuitI for said second operating.,r magnet-under the control ot' said first relay.

9. ln a telephone systemq a calling line` :i called line, a lilik circuit for connecting the two, aplug for extending a connection from the link to the called line, a. source et signaling current., a signal tor the called line, a circuit for applyingsaid current to said called line to operate said signal, a relay for controlling said circuit to 'control thc operation of said signal, a second relay in series with said source of current in said circuit, said first relay controlled by said second relay, which operated in turn over said circuit. while the saidsignal is being operated, and a relay for intermittent-ly interrupting the said circuit.

10. In antelephone system, a calling line, a called line, a, switch for connecting said lines, a signal for the' called line, a circuit. comprising a ringing,r current generator and a battery, another' circuit/comprising said battery and a. resistance, a relay for alternately connecting said circuits in series with a slow acting relayi and a third relay for connecting said slow acting relay and circuits with the called -line to periodically operate said signal, said third relay controlled by said slow acting relay 1l@ In a #telephone system, a rst line, a second line, and a third line, talking conwitch for eacl line, a relay for each switch, an operating magnet for each switch, means tor operating one ci said relays over one el the talking" conductors of its line, first to Control its associated operatingmagnet to connect ,its line with another ol. said lines and second to render the operating magnets ofV the other of said switches inoperative. y l2. In a. telephone system, a i'irst line, a second line, a third line, a switch for each line, a relay foreach swiwli, an operating magnet for each switch, a circuit :for escl?. Eii'iagnet controlled by its associated relay7 means for'energizing' said relays simultaneously whereby the rst of relays may operate its associated operating magno-tto extend a connection to another, line, `and means whereby said -rst e yrentlers` the controllingcircuit ier the-'operating magnets of said vother switchesf'inoperative.

1.3111 a telephone system, a, first line,l a second line, a third line, a switch tot' each line, e. relay for each switch, an operating n'gnet for each switch,` acircuit 'for each magnet controlled. by its associated relay,

5D' ,means for energizing; said relays simultane- ,sev l? ously whereby cach of said relays may control tlic circuit ot' its associated magnet to cxtcnd a connection to another line, and-may also control the circuit of the operating inagnct of thefnext succeeding switch whereby said lines may be successively connected to other lines.

ll. ln a telephone system, a first line, a'

second line, a third line, an automatic switch t'or each line, a relay tor each switch, an operating magnet tor eachk switch, a circuit for each magnet controlled by its associated rcla means for energizing said relays simultaneously whcrebythe tirst of said relays may operate its associated operating magnet' to extend a connection to another line, and means whereby said first relay renders the controlling circuit for the operating magnets ol said other switches inoperative.

l5. in a telephone system, a first line, a secoml'line, a third line, a l'irogressively movablc switch for each line, a relay for each switch, an operating magnet for each switch, a circuit 't'or each magnet-f controlled by its associated relay, means toi-,energizing said relays simultaneously whereby the first of ing magnet to extend a connection to another line, and means whereby said first relay renders the controlling circuit for the operating magnets of said other switches inoperative.

lo. In s, telephone system, a first line,V a second line, a third line, an automatic switch for each line, a relay for eac-h switch, an operating magnet for each switch, a circuit for each magnet controlled by its associated relay,`nieans for energizing said relays simultaneously whereby each oiE said relays may control the circuit of its associated magnet to extend a connection to another line, and may also control. the circuit ot' the operating niagnet. of the next Succeeding switch whereby said lines may be successively connected to other lines.

17. ln telephone system, a iirst line, second line, a third line, a progressively movable switch 'tor each line, a relay for each switch, an operating magnet for each switch,

said relays may operate its associated operas circuit for each magnet controlled by .its

associated relay5 means for energizing said relays simultaneously whereby each of Said relays may control the circuitoif 'its naso? elated magneti' 'to extend a, connection .to an,- other line, and may also cont-rol the :circuit ol? the operatingy magnet of tbe-next. suer switch whereby sai individual 'to lsaid first line for rendering the control circuit of the second lineA inoperative when the said rst line makes a call to the third line, a signal for said third line, a source of signaling current, means for intermittently applyin'gvsignaling current to the line to operate said signal, and means for aitomatically disconnecting said signaling current from the line as soon as the called subscriber responds While the `signil .10 is being operated.

Signed by meet Chicago, Cook county, Illinois, this 20th day of November, 1913.

- BERNARD D. WILLIS.

Witnesses:

H. W KRACKE, Amon OSWALD.

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