US1757217A - Telephone system - Google Patents

Description

May 6, 1930. w. A. RHODES 1, 5 ,2

TELEPHONE SYSTEM Filed July 2. 192-1 2 Sheets-Sheet 1 /N VE/VTOR V WILL/AM A. fifioaas Wt Arm/awn May 6, 1930.

W. A. RHODES TELEPHONE SYSTEM Filed July 2, 1927 2 Sheets-Sheet 2 /,v Vagina; WILL/AM 4. fifiooes Arronmar Patented M y 6, 9

- UNITE, STATES im A.

par-m m V nnonns, on NEW YORK," 1v. Y., gamma-Tommie TELEPHONE AND TELEGRAPH corfrANY, A oonrona'rroir or NE YORK TELErHoNn SYSTEM Application. filed July 2, 1927.: j Seria1,'1 To. '203,051.

This invention relatesto telephone systems and has for its object 'the provision of improved signaling means for suchsystemsg More. specificallythe invention provides" 5 means for causingtheintermlttent operation of a signal whether said signal is operated or non-operated at the tlme. 1 Thls 1s accomplished by the insertion of a differential relay between the signal and the'interruptingde- Io vice, which tests to ascertain whether or not-- the signal is operated. ,If the signal is not operated, this relay completes a circuit for intermittentl T operating the signal and if the si nal is operated, it completes a circuit ed steadily over the called subscriber sjack as adisconnect signal wh nthe trunk is released. In order to. flash thejlamp of. the

30 trunk when reseized before the plug is removed from the 1ack, 1t1s necessaryto internnttent-ly extinguish .the j'disconnect lamp.

This is. brought about by theinclusionof a differential relay inthe flashing circuit for the lamp. when the flashing circuit is closed due to the seizure or reseizure of the trunk, it tests the 7 condition of the lamp and'appliesthe proper condition for flashing it. v, This relay also prevents the application of ringing current to the trunk until the plughas'been removed from the jack and inserted in the proper jack. A polarized relay controlled by the discharge, through an induct-ion coil when a particular circuit-is closed, serves to operate a peg count meter. 1 ,1 I

The invention willbe more'clearly understoodfrom a'consideration of the following detailed description in connection with the attached dra g a in'which: I

for intermittently extinguishing the signal.

Such trunks may be reseized'atthe,

This relay is so arrangedthat Figure shows a-trunk circuit for a call announcer; and V I Flg, 2 shows an operators equlpment comuse with inon to -a pluralityof such trunks;

"One form of callannouncer system is disclosed in U. S. Patent 1277, 140, granted to A E. Lundell, September3, 1918, and a general reference-is made thereto although the details thereof are not in all cases applicable i to the present disclosure. A VVhen the subscriber at substation 100 initiates acall, his line is extended by means of linefinder101'to district selector 102 and to a register sender 103. The subscriber then dials the-number of the Wanted subscriber, sett ng upxa reg stratlon 0n the sender 103 which controls the operatlon of the district selector 102 in selecting an idle trunk to the ofiicev at which the-subscriber located. Assuming thatthe called subscriber is-locat'ed -11) an oli ice equlpped vto receive'the called-linenumber by means'of a callan- .nouncer; aclass reglstrat on Wlll .be set :up

in the'sende'r which WlllZCEILlSQ the association ofcall aiinouncer121 with the sender 103. When idle trunk has been selected, the sender Will connecta relay across the trunk conductors in the well known manner,

completing" a circuit from. battery through thelowerlwinding of relay 104-, lower; back contact of relay 105, lower left Winding of repeating, coil 10.6, and thence through dis trict selector'l02 and the relay of the sender back to the upper left winding of coil 106, upper back contact of relay 105, upper wind-' ingof'rejlay 104. to ground. Relay 10 1 operates closing a circuitfrom battery through the left winding of relay 107 back contact of relay 108,'to gro undatthe front contact of relay-104. 7 V y f in op'eratingcloses a circuit Relay 107 from ground through lamp 117 left front Contact of relay .107, conductor 118, primary winding 0oi1 225 tobattery. 'The rush of current produced by the establishment of this'circuit induces a current inthe secondary winding ofthe coil 225 operating polarized.

relay 22 6 in the'direction to close its contact to operate relay 227 and meter228. Relay arc-is polarized so as'to prevent its operation on the opening of the circuit of lamp 117 at-which time the induced current is in the opposite direction. Relay 227 is slow to re. lease so that possible momentary operations of relay 226 will not reoperate the meter.

Lamp117 is common to a'plurality of trunks and indicates that one 'of the" group of trunks has been selected atthedistant end. Relay107 also'closes a circuitfrom ground over its outer right contact, Winding of relay 109 to'battery. Relay 109 in operating closes a circuit from-battery through the, winding of relay 110, right front contact of relay 109, right normal contact of relay11-1,'which is individual to the next trunk of the group,con-

ductor 112, winding of relay 200 to' ground at the back contact of relay .201. .Rel'ays 110 and 109eXt-end "tip and ring conductors of they trunk to the common position equipment,

shown in'Fig. 2, as well as certain control conductors.

' The equipment shown in- Fig.2 is common I to all the trunksappearing'at that particular position and is available only if the operator is at the position. When the operator associates her trunk with the position by means of a jack (not shown) relay 202 operates in series with the operators transmitter and repeating coil, in turn operating relays 203 and 204 from ground overjtlie positionsplitQ ting circuit which.has been omitted from the disclosure. 1 I r lVith relays 203 and204 operated, the operation ofrelays 109 110 completes a circuit from battery throughthe lower right winding of repeating coil" 106, supervisory relay 114, outer left front contact .of relay 110, conductor 1.15, left, front'contact relay 203, winding of'relay 205 to ground. Relay 205' operates but due to the high resistance of that relay, relay 114 cannot operate. Relay 205 closes a circuit from ground over its .front contact,ba'ck contact of relay 206, winding of relay 207-to battery 7 Relay 207 closes an operating circuit for relay 108 and a hol'ding'circuitfor relay 107 which may be traced from battery through the right winding of relay 108, right Winding of relay 107, inner left frontcontact of relays 109 and 110, conductor 113, left front contact of relay 204 toground at the left front contact of relay 207; Rela'y 108 operates in this circuit and locks throughits left winding to ground at the front c'ontactof relay 104,

measured interval elapses between the'opera- 'tioniof relay 209 and the'operatio n of relay 211. lVhen' relay 211 operates it connects bat- V tery over its left front contact to resistance o v 208 thus shunting" and releasing relay 209 and in turn relays 210 and 211. .Relay 211 in operating also closes a circuit from ground at'it's right front contact through the winding of relay 212 to battery.- Relay 212 at each sistance213 to conductor 214 and ground through resistance2151to conductor 216.1 Re

operation connects battery through the relays 209 to 212 form an interrupting mechanism whereby battery and ground areintermittentlyconnected to conductors 214 and A t rst is closed from battery through-the winding operation of relay 212 a circuit.

andnormal contact -'of relay-218, outer left contact of relay 212, to'ground at theinner right front contact of'relay 207.' Relay 218 locks to ground at relay 207 independent of relay-212. Itelay 218 closes an obvious circuit for relay 219 which in turn operates'relay 220 overthe inner right back contact o'f'relay 21. Relay'220 extends its operat-.

' ing circuit to-relay 222 and relay222 closes an'obv-ious circuit for relay 223. Relay 223 then closes a circuit for relay 221, but relay 221 in operating closes a holding circuit for relay 223 overTthe'inner right alternate contactfjof relay-221' to groundat thefront contactof relay 21 9. However,the operation of relay 22,1 opens the circuit of relay-220 and that inturn opens the circuit of relay 222,

opening theenergizing circuit for relay 223.

Relays 220, 222 and 223 are 'slowto operate in order tointroduce'a measured interval betwee'n the operation of the various relays.

The purpose ofthis chain of relays is to transmit a pair. of tones tothe distant end of the trunk when; the trunk is seized by an operator. Nhenf'thje trunk is seized by a sender, they serve to prepare the sender for-transmitting through the lowerri'ght Winding of repeating coil 106, winding of relay 114, outer left front 7 contact of relay 110, conductor 115, left front 7 contact of relay-203, left back contact of relay 221, left front contact of relay 219, secondary winding oftone coil224, the next to the inner right contact of relay 219, outer right back contact of relay 221, right front contact of relay 203, conductor 1-16, middle-left contact of relay 110, outer left contact of relay 109,

upper right Winding of repeating coil 106 to ground; Relay 114noW operates closing a a called line number. When relay 219 opcrates it completes 'a' circuit from battery circuit from battery through the" winding 7 of relay 105," front contact of relay 114, to ground at the inner right contact of relay 108. The operation of relay reverses the connection of relay 104 to the tip and ring conductors of the trunk and by reversing the polarity of the current flowing thereover prepares thesender to make call announcement. When relay 221 operates, it discon,

nects coil'224 from the' windingof relay 114 and relay 114' releases inturnreleasing relay 105 and restoring the'polarity over the trunk circuit.

Relay 219 in operating also closes a circuit from batterythrough lamp 119, outer right frontcontact of relay 110, conductor 120, winding of relay229, neXt'to the outerj right contact of relay 219, to the outer right,armature of relay 207, whence the circuit extends through the left winding andleft back con tact of relay 230 to intermittent ground over conductor 216,- Lamp 119is caused to'flash in this circuit. It will be noted that a second icircuit exists from battery throughthe right Winding of relay 230, contacts of relay 207, left 'windin' 'and left back, contact of relay 230 to intermittent ground over conductor 216. However, relay 230 is; so wound that the combined eil'eot of the two 1 circuits throughfthe left winding of 'relay230ju'st neutralizes the efiect of the circuitthrough the right winding thereof and relay 230 remains deenergized. the above traced circuit closing anobvious circuitforlamp'231 which is individual to the position. Relay 229-being slow to release holds lamp 231 lighted steadily.

TV hen relay 221' operates disconnecting coil 224 irom'the winding of relay 114,'it'c0nnects ber of the wanted subscriber, she operates re-v lease key 232,'which completes a circuit from ground over key 232, outer right frontcontact of relay 204, left back contact of relay 1 230, winding of relay 206 to battery. Relay '206 locks over its front contact to ground at the front contact or" relay 221 or the'front contactot interrupter relay-212, thus insuring that relay 206 will be the last relay to release. the circuitbf relay 207 in turn opening the energizing circuit of relay 108 and the holding circuit of relay 107. Relay 207 also opens I the flashing circuit for lamp 119, releasing relay229 and opening the circuit-ofrelay 230. It also opens the holding'clrcuit of relay 218 which causes the release of'rela ys 219,

223, and 221 insuccession. As soona'srelay 212opens its contact, relay 206 releases and theposition circuit .is restored: to normal. T he release of relay causes the release of relaylO'l' and extinguishes lamp117. lVith relay 107 released,relays 109 and 11 0 release and the position circuit may be usedfwith another trunk.- I r Theoperator then tests the called subscribers line in the usual manner and finding it. idle inserts plug 122 in ack 123, whereupon Relay 229 operates in At its left contactrelay 206 opens" a circuit is-closed froin groundthroughthe I winding of the subscribers cut-ofirelay l24, sleeve of jack 123 and; plug122, lower wind tery. Relays-124 andg125foperate this circuit, relay 125%01051118 a circuit 'inparalingiof relay 125 throughflanip 11 9 to -batlel with lamp 119 which maybe traced from ground,"- through the" winding of relay: 124,

sleeve of jack? 123 and plug .122",- low'e'r windingot relay 125,;left front contact of "relay 108, rightb'ack contact ofrelaylO'l, inner upper front contact of relay 125,back'con-' tacts of relaysl127 and 128m ara-unmet, i

the winding'of relay-128, winding ofrelay 129 to battery.- Relay-129 operatesclosinga'circuit, from ground over its upper front contact 0 and theouter upper front contact oifi relay 125, to the ti pfof plug 122 and the tip conductor of the subscribers line, back; over the ring'conductor, over the ring of jack 123 and plug 122, lower front contact of relay" 129,. winding of relay 127 to source of 1'inging.cur;-.

rent 126. Relay 127 is insensitive to ringing current but as soon as thecalled subscriber a answers closing a directcurrent path,'relay 1'27 operates, openmgtheshunt around relay 128, which in turn operates and lockstob attery at its front contact. This battery shunts relay 129 causing that relay towreleaseand extend the subscribers line through to the right windings of repeating coil 106.1This completes a circuit for" relay 114 which again operates relay 105 and reverses ther'current over the trunk conductors which reversal is now effective for any dGSlI'GtlSllPBIVISOIY purpose; The circuitiremainsxin; this condition until conversation is ended atwhichtimethe Y restoration ofthe called subscribers receiver releases relay 114, releasing relay105. and restoring the connection of relay. 104.." When 124 as adisconnect signal.

Should the trunk be i-eseize'd at thedistant end ,bet'orelthe'"operator removes plug from jack 123, the operationsf'willproceed I as above described until'the circuitiis established tothe outer right armature of relay 1207, through lamp 119. Due tothepresence of plug. 122in jack leaiground willbe con;

nected to the armature-of relay207 instead of battery as in the previous case; This re,- sults in the establishmentofa circuit through the right winding of relay 230, but since ground is connected to'theleft-windingofrelay 230 over the back contact of that relay the calling subscriberrestores his receiver, re- I lay1O4 releases and relay 108 also relea'sesin .turn releasing relay 128. Lamp 119 .now lights steadily in series with. relays 125 and as well' as through the winding of relay 124. a i A the current flow in this windingwill be great- 2 1y reduced and'the'relay will operate due to:

the unbalanced condition. With relay230 operated-the circuitthrough-the left winding r of that relay is'extended over its left front contactto intermittent 'batteryfover' conductor I 214. This circuita-ids in operation of relay 230-each time it, is closed, so'that relay 230 remains operated as long as ground is connected: to lamp 1191-ove1g the plug 122.

'- operator,

Lampr1l9 istherefore intermittently shunted and thusflashes to attractthe attention otthe .Should'thebperator disconnect I her position equipment from tihe trunk with OlltafiISt removing the plug fromthel jack, the operation of key 232 is inefiective, since thecircuit of relay 206 is open. atirthe contact of relay 230. The removal of plug 122 from the jack removes ground fromthearmature minals to 'batte'ryof a given polarity, and I of relay 207and from relay-2 30 .whiclnreleases to continue flashing lamp 119 by means of intermittent ground on conductor216; The release of relayv 230 renders release; key 232 effective: and the. connection may be com-. pleted in the usuaImann'er. In case the-circuit of lamp 119, should-be gnounded .falsely,

' an emergencykey; 23 l is provided'which will operate relay 2O6 directly, even though relay 230may-be operated. v [,What isclaimed is: 1 I

1-.' In a signaling system, an electrically operable signal connected atone of its termeans connectedto another terminal of said signal to cause a characteristicoperation of said signal by associating-Withsaid other terminal battery of the same or opposite polarity. V w Z 2." In a signaling system, an electrically operable signal'connected'at one of its terminals to battery of a givenpolarity, and means conneeted to another terminal'of said signal to cause said signal-to be intermittently operatedunde'r varying conditions, by associating with said other terminal interrupted battery of the same-or opposite polarity. v

Ina: signaling system, anelectrically operable signal connected: at-one of its terminals to batteryofa given polarity, means connected to a second terminalof said signal to vary the conditions under which said signal is operated, and va differentially. connected relay responsive to the condition connectedto said second terminal for-controlling the association of'battery of thef-sainepor opposite polarity with said second terminal to cause the operationof said signal; I a V, v c

4. In a signaling system, anieleotricallyoperable signal connected at one of its tennis nalsto battery of a given polarity-and voltage, and means connected to another termi-,

nal of said signal to causesaidsignal to be intermittently operated (underwarying con:

- ditions by associating with said other terminal-interrupted battery .of the same or op:

' pos-ite polarity and the same voltage.

5. Ina signaling system, ,an'lelectrically operable signal connected'ilatoneqof, its ter- -minals to battery of";a ,.given polarity and voltage, means connected to. a,,second,= termi-v interrupters.

nal of said signal to vary thecond-itions under v which said signal. is operated, and adifiierena tiall-y' connected relay, responsive to 'thecondition connected to said second terminal, for

controlling the association of battery of the same or opposite polarity and the samevolt- 7 age with said second terminalto cause the op- "eration of said signal. I I p 6. In asignaling system, an electrically op- 'erablesignal, means to cause the steady operation of said-signal, and means to cause the intermittent operation of said signal, said last'means being efiective alone or in combination with said first mentioned means" j "7. In a telephone system, a plug ended trunk, a jack, a signal'associated with said trunk, meansefiective when the plug of the trunk is in said jack to causethe steady operation ,of said'signal, and means for causing the intermittent operation of said signal com'prisinga plurality ofinterrupters, and

means'fortesting whether or not said signal is operated for discriminating between said 8.-In a telephone; system, a plug ended trunk, a jack, a signal associated with said trunk; connected atone of its terminals to battery. of'a given polarity, means effective discriminate between. said interruptersa 9-..Ina telephone system, a plug ended trunk, a jack, a signal associated withsaid trunk connected at one of its terminals to battery of a given polarity, means effective when theplug of said trunk is inserted in said jack to cause the steady operation of said no signal, and means forgcausing the intermits tent operat1on"of sa1'd lslgnal comprising an interrupterv I connected to V, the same battery polarity as is connected to said signal, a sec-. ond interrupterrconnected to battery of the opposite polarity, and a difierentially c0'n-. nected relay for testing whether or not said signal} is operated to discriminateibetween said interru'pters.

In a telephone system, plug ended trunks,. acks, operators equipment common to said trunks,asignal associated with each, of said trunks, means effective when a plug of one of said-trunks is in one of said jacks to cause. the steady operation of the correspending signal, means in said common apparatus to cause; the intermittent operation of said slgnal comprisinga plurality of inter- I rupters, means'for testing whether or not said signal is operatedfor discriminating be tween said interrupters, and means for releasing said common apparatus from said trunln'saidmeans beingv under the control of said testing means. I v

11. In a signaling system, an electrically operable signal connectedat one of its termi nals to battery of a given polarity andivoltage, means connected to a second termmalof said signal to varythe conditions under which said signal is operated, and means for causing the intermittent operation of said signal comprising an interrupter connected to the same battery polarity as is connected to said signal, a second interrupterconnected to battery of the opposite polarity and audiiierentiallywound'relay for-testing whether or not said signal is operated, said relay being normally in series with-said signal and said secondinterrupter overits back contact and when operated in series With said slgnal and said first lnterrupter over its front contact.

12. In a signaling system, an electrically operable signal connected atone of its terminals to battery of a given polarity and voltage, means for connecting the other terminal terminal of said signal, a second interrupter connected to battery of the oppositepolarity and adifierentially wound relay for testing Whether or not said signal is operated, said relay being normally in series With said sig- 7 nal and said second interrupter over its back contact and inoperative 1f saldsignal 1s not at the time. operated andoperative if said signal is operated to connect itself in series with said signal and said first interrupter over its front contact.

In testimony whereof, I havesigned my: a name to. this specification this 'lst'day of July, 1927. V

, WILLIAM A. RHODES.

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