US2054702A - Telephone system - Google Patents

Description

Spt. 15, 1936. 4 G. KINER 2,054,702

TELEPHONE SYSTEM Filed Jan. 27, 1955 5 Sheets-Sheet 1 PIEDI-' neg.

Sept. 15, 1936. K|NER 2,054,702

TELEPHONE SYSTEM lFiled Jan. 27, 1933 5 Sheets-Sheet 2 a, ZnL/ET-Dn v Elem-z K 117er' Sept. 15, 1936.

G. KINER TELEPHONE SYSTEM Filed Jan. 27, 1953 5 sheets-sheet 5 *n i Q L@ n u...

7l HUEZ-ZDF? EVENT? KZ'UEF spn 15, 1936. VG, NER 2,054,702

TELEPHONE SYSTEM Filed Jan. 27, 1935 5 sheets-sheet 4 zi Y H Urn/ay.

Spt. 15, 1936. G. KINER TELEPHONE SYSTEM 5 Sheets-Sheet 5 Filed Jan. 27, 1933 v I Eller-1n Kil-IEP @,w

Patented Sept. 15, 1936 UNITED STATES TELEPHONE SYSTEM Glenn Kiner, Park Ridge, Ill., assgnor to Kellogg Switchboard and Supply Company,l Chicago, Ill., a corporation of Illinois Application January 27, 1933, Serial No. 653,773

15 Claims.

My invention relates to automatic telephone systems and more particularly to an automatic private branch exchange of the full relay type.

A feature of my invention is the provision in a telephone system of the type described of a plurality of channels for interconnecting subscribers lines at the exchange.

Another feature of my invention is the provision in such a telephone system of relay means controlled by the calling subscriber for selecting an idle channel.

A further feature of my invention is the provision of relay means associated with the selected channel for connecting the calling subscribers line to the line of the called subscriber provided the said called'line is idle.

Other features will be disclosed from time to time as the description of the invention progresses. l

In the accompanying drawings like reference characters indicate like parts and Fig. 1 is a schematic drawing of the apparatus comprising the line and selector circuit;

Fig. 2 shows the connector circuit;

Figs. 3 and 4 show the channel selecting apparatus; and

Fig. 5 shows a portion of the channel selecting apparatus in detail.

When Fig. 2 is placed to the right of Fig. 1 and Fig. 3 is placed above Fig. 4 the entire circuit arrangement is disclosed.

The present invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed or modified so Vlong as such changes and modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

The system of my invention is shown in the drawings as a lO-party exchange provided with three channels for interconnecting the subscribers. Of course, the system may be enlarged indefinitely by having a second, third; etc. channel selector, that is, have one channel lead to other channel selecting means and then to still another. Referring particularly to Fig. 1 of the drawings the line conductors 2 and 3 at the left of the drawings lead to a subscribers station, line I, which is equipped with the usual automatic substation equipment and terminates at the private branch exchange in the line circuit IL which comprises line relay ILR and the cut-E relay ICO. Each of the subscribers stations terminate at the ex change in a similar line circuit. A line channel relay ILC connects the line circuit IL to the selector circuit SC, also shown in Figfl, which leads to a connector circuit CC, shown in Fig.2, and thence to the subscribers station line I0 of Fig. 2, through a line circuit IOL which is similar to the line circuit IL. f

In Fig. is shown the line channel relay ILC which is the same one shown in Figs. 1 and 3.

Associated with the line I are three line channel relays ILC, ILCA and ILCB, which serve to connect the horizontal commons' IH to 'the vertical commons IV, 2V or 3V, which lead to respective selector circuits and connector circuits each of which comprises a channel. If the line I institutes a call and all the channels are idle the rst link'channel relay ILC will operate to connect the line to the commons IV of'the rst channel. 'If the first channel is busy the second link channel relay ILCA will operate to connect the horizontal commons IH to the vertical commons 2V of the second channel and if the rst two channels are busy the third relay ILCB will connect the line I to the third channel thru the verticalcommons 3V.' In other Words the calling linewill be connected to the rst idle channel in the exchange. It is to be understood that the terms horizontal commons" and vertical commons are used only for the purpose of facilitating the description of the invention and refer only to the drawings to distinguish between the commons for the lines and the commons for the channels. In practice the commons may be neither vertical nor horizontal but may proceed in any direction.

In Figs.3 and 4 I show the full channel selecting mechanism necessary in a line exchange. The link channel relays ILC, ZLC, etc. are shown minus the contacts necessary to connect the horlzontal and vertical commons which are shown in Figs. 1 and 5. The link channel relays ILCA, ZLCA to I IlLCA are associated with the second channel and the link channel relays ILCB to IIBLCB are associated with the third channel. The contacts shown at the extreme left of Figs. 3 and 4, marked dI, d2 to dIU are associated with line relays such as I LR of Fig. 1 ofthe respective subscribers lines and are controlled by the switchhook at the subscribers station in the Well known manner. Should a callingsubscriber operate his switchhook the line relay is operated and the contact dI to dln associated with his line'is operated to connect ground thru the contact of his associated link channel relay LC of the iirst channel.

Should this channel be idle the channel selecting relay ICSR is operated to establish a circuit for the link channel relay LC which connects the horizontal commons associated with the calling line to the vertical commons leading to the selected channel.

A better understanding of the invention can be obtained by tracing a call from a calling subscriber such as line I toa called subscriber such as line Ill. The operation is as follows. The calling subscriber at line I removes his receiver from the switchhook. This establishes an operating circuit for the line relay ILRwhich' is operated by current flowing from grounded battery thru winding of ILR, normaljcontact I, line conductor 2, thru the cl-osedswitclihookcontacts at subscribers station line I, line conductor 3, normal contact.4to..grou-nd. The relay ILR operates over this circuit and closes its alternate contact dI which places groundupony the-conductor cI;

Referring nojwV particularly to Fig. 3, the ground upon the conductor eI lestablishes an operating circuitj for the master line relay MLR of Fig;` 4. This circuitcan be traced from grounded" contact dI, conductor eI, contact Ig, conductor 8, contact Iga, `conductor 8a, contact lIglb,f .conductors Stand I0' thru thecoil of master line relay MLR to grounded battery. The relay operates and attracts; its contacts AI, A2 to AI I. The closure-,of contact AI establishes an energizing circuit for the channel selecting relay ICSR; This energizing' circuit can be traced from grounded-1 battery thru the relay ICSR, normal contactszbIIl, b9; 178,' b1 to bI and ground at alternate contact aI; The relay ICSR operatesand'attractsfits contacts 5 which establishes anxoperating circuitv for the link channel relay ILC associated with the calling line #L This circuiticanbetracedfrom grounded battery thru the-winding of thef relay ILC, its make-beforebreakv contact fl, conductor 6, alternate contact 5; conductor II, alternate contacts a2, and dI to AVground. A locking circuit for the link channel:-relay ILC is closedthru itsy alternate contact Ig. to ground .at alternate contact dI. The relay ILCV attractsv its contacts Ih, I y' and I 7c to connect-the horizontal-commons IH to the vertica'lfconrrnonsV IV associated with the rst channel.l Uponthe Voperation of the link channel relay;A ILC the', energizing circuits of the relays ML'R' and ICSR- are broken and the same restored t'o normal.

Ifaf'second call isinstituted, while the rst is still'unnishedby` a line such as-line'4 (not shown) theline' relay associated with the line circuit of that line will operate to close its alternate-contact d4'shown in Fig. 3.

The grounding-.of contact d4 causes the operation of the master `line relay MLR, the circuit beingftraced from'. alternate contact: d4, normal contacts-4g,` lgazand 4gb, conductors 9 and I0. The relayMLRzattracts its-contacts aI to all and extends ground thru its alternate contact al to alternate contact bI of the link channel relay ILC, whiclris-.holding the rst connection, conductorf I4; normal contact bla of ILCA, normal contact b2a, b3a; b4a, b5a.' ba, conductor I5, blagandrso on to conductor I5 and relay ZCSR which' operates and attracts its armatures 5a whicha-closesan energizing` circuit for the link channel relay 4LCA-associated with the calling line4. This circuit can be traced from grounded battery-, the; windingl of- 4LCA, conductor II, alternate-:contact 5a, conductor I8, alternate contacts a5 and d4 to ground. The relay 4LCA operates similarly to relay ILC and connects the horizontal commons IH associated with line 4 to the Vertical commons 2V which lead to the second channel.

Should a third call be instituted by line Ill while the rst two calls are still being carried on, the line relay LR will close its alternate contact dl to ground the conductor eID which leads thru normal contacts IIlg, IUga, IIlgb and conductor II) to the master line relay MLR which operates as above explained to close its alternate contact a! to extend ground thru alternate contact bI of ILC, which operated to establish the first call, conductor I4, normal contacts bla, b2a, b3a, and alternate contact b4a of link channel relay 4LCA, which operated to establish the secondcall, conductor I 9, normal contacts bIb to bIElb, and relay 3CSR which thereupon operates to attract its contacts 5b which closes an energizing--crcuit for the link channel relay IULCB which operated by current flowing from grounded -battery thru thevwinding of the relay, normal contact fIDb, conductor 2I, alternate contact 5b, conductor 22, alternate contacts aII and dI0 to ground.. 'I'he'relay IOLCB thereupon operates and connects the line II)y to the vertical commonsfSV which leadto the third channel.V

lIf another'line, such asline,3, desires to institutea call while the other three calls are still in progress its line relay will close its alternate contact b3 whichwill furnish ground for the master line relay MLR, as above explained, which will energize to supply ground thru its contact aI, alternate contact bl, normal contacts bla, etc. to alternate contact b4a, conductorv I9, normal contacts bIb, etc. to alternate contact VbIllb and conductor 23 with no result as all the channels are busy.

Referring-'again to'Fig. l'and the original call instituted by line I the energization of the link channel relay ILC above described connected the horizontal commons H to the vertical commons V which lead to: the channel comprising the selector SCr and the connector CC closed energizing circuit for the dialing relay DR which circuit can bel tracedfrom grounded battery thru the lower winding of the dial relay DR, conductor 24, alternatecontact Ic, horizontal common H, the line conductor- 3, the closed switchhook contacts at line I, line conductor 2, horizontal common H, alternate contact Ih, conductor 25, thru the upper' winding of dialing relay DR to ground. The operation of the dialing relay DR causes the attractionof. alternate contact 26 which closes an obvious energizing circuit for the switching relay SW which closes alternate contact 21 to establish anenergizing circuit for the cut-off relay ICO Whichis -operated by current ilowing from grounded battery thru resistance r, alternate contact 21 ofISW, vertical common V, alternate contact Iy' of ILC, horizontal common H, thru the winding of ICO to ground. Relay-ICO operates to interrupt' the circuit of line relay ILR which deenergizes and opens the energizing circuit of relay ILC but before this circuit is broken a lockenergizing circuit ofthe switching relay SW but due toits slow-to-release -construction theTsa-id relay remains energized andgroundis supplied to the dialingconductor DCwhich causes the operation of the electromagnet MI by current owing from grounded .battery thru the winding of the .electromagnet Ml, normal Contact 33, dialing conductor DC, normal contact 321;of RC, coni ductor' 3|, alternate contact `3|) of SW, normal contact 26 of. DR. Thev relay Ml energizes and attracts its alternate contact' 34. After the first interruption by the dial CD the relay DR is again energized to attract its Ycontact 26 and again establish an energizing circuit for the switching relay SW which has not restored due to'itsvcon-V struction and the opening' of contactf26 breaks the energizing circuit of the` relay M| butas it is also ofk slow-to-release. construction'its .alternate contact 34 is maintained in its 'operated position until. an energizing circuit for the relay C| and a holdingcircuit for MI is established. This circuit can be traced from grounded battery, the winding of relay M|, relay CI alternate contact 34 of Ml, conductor 35, alternate contact 36 of SWV to ground. 'I'he relay CI operates over this circuit and attracts its contact 33 to remove the relay MI from the dialing conductor ,DCL The second interruption of theline conductors 2 and 3 by the dialV D again deenergizes the' relay DR which restoresnits contact 26 l.to normal to place Yground upon the dialing conductor DC as above explained whichrthereupon causes the energization of the relay.M2 current ilowing from grounded battery thru rthe winding ofthe relay M2; normal contacti38, Ialternate contact 33 ofv CI, to the grounded dialingl conductor DC. Upon the reenergization of dialing relay DR the energizing circuit of the relay M2 is interruptedbut an energizing circuit for the' relay C2 ,thru` the alternate contact 39 vof,M2 is established over the previously traced circuit: so that upon the next interruption of the'line conductors and the subsequent deenergization of the dialing relay vDR the grounded dialing conductor DC is extended to the next set of relays with the same result as heretofore explained. This is repeated until :upon the last interruption of-'the line therelays MIU and CID are operated to connect the calling subscriber to the desired'line. The, relays Mvl!) and CID are maintained energized by current flowing from grounded battery thru the winding of MIO, the Winding'ofI relay Clil,l alternate contact 43 of MID, conductor 35, and-alternatezcontact 36 of SW to ground. Y Y Y Upon the first restoration of the dialing relay DE the slow dialing relay-SDR was operated by current flowing from grounded battery Athru ythe winding of SDR to ground at normal ncontact 26 of DR. Due to the slow-to-release construction ofV this-relay it remains in its energized position until after the last interruption of the calling line and the subsequent energization of the dialing relay DR at which time it restores itsY contact 46 to normal thereby establishing energizing circuits for the cut-off relay IGCO of the called line and either` the ringing control relayl RC or busy .test relay BTR depending upon the busy or idle condition of the called line. 'The' three lconductors leading to each line fromthe contacts of relays Cl tov CIO are multipled between the connector circuits of the channels. Y

If the line is busy the busy test'relay BTR will be operated by'current flowing from grounded battery thru the winding of BTR,'normal contact 4T. of RC, conductor 48, normal contact 46 orSR,

conductor 49, alternate contactr45 of C|||,rconductor 5|),V thewinding of cut-01T relay IBCO to ground. The busy test relay BTR operates to connect a busy'tone BU to the calling line which informs .the calling subscriber vthat the desired line is busy at this time. The circuit for this tone can be traced from BU, alternate contacts 54 of BTR, .normal contact 55 of RC, normal contact 56 of IR, over the heavily marked conductors to the calling subscribers line I;

, If the calledline is idle the ringing control relay. RCR will operate before the busy test relay B'I'R can do so and will vattract itslarmature 41 to disconnect the busy test relay BTR and prevent its energization to give a false busy test to the calling subscriber. .The attraction of contact 4l of RC shunts out thev high resistance winding Rf andV allows the energization of the cut-oil' relay associated with the line of the called party which relay |0C0foperates and attracts its contacts 5| and 52 to disconnect the line relay |0LR from the line conductors.v The energization of ringing control relay RC provides an energizing circuit for Ythe ringing relayRI which .circuit can be traced from grounded battery thru a constantly rotating interrupter I, Winding of ringing relay RI, alternate contact 5l of RC, normal contact 58 of RT,` alternate contact 59 of SW to ground. The ringing relay lRI is thus alternatelyl energized and deenergized to connect ringing current supplied from the generator Gen. to signal the'subscriber at'line |0. The path for the ringing current can be traced from the generator Gen., alternate contact 56 of RI, alternate contact 55 ofV RC, over the heavily marked conductor, alternate contact 6| of CIO, thru the call bell at line ID, .back thru alternate contact 44 of CID, alternate contact 62 of RC, and alternate Contact 60 of RI` to the generator,

fA ringing tone is'supplied vthe calling subscriberv from the tone punching T, .alternate contact- 64 of RI over the heavily marked conductors to the calling station. if The subscriber at line l0 removes his receiver from the switchhook invanswer .to the signal and thereby closes an ,energizing circuit for the supervisory'relay SR which attracts its contacts 63 to establish an obvious energizing circuitr for the ringing ltrip relay .RT Which closes vits alternate contactv 58 to establish a locking circuit for itself and to also interrupt the energizing circuit of the ringing relay RI which restores and disconnects ringing current from the called line and completes the'conversational circuit by the restoration of its contacts 56 and 60.

Y Upon the termination of conversation Ythe calling subscriber replaces his receiver uponits switchhook and thereby causes the interruption of thedialing relay DR which restores its contact 26 to normal and thereby opens the Yenergizing circuit of the switching relayrSW which restores its' contact 59 to interrupt Vthe locking circuit of the ringing trip relay RT and .restores its alternate contact 36 to interruptthe locking circuit of the relays MIO andClU which restore to normal and disconnect the connectorcircuit from the line circuit at contacts 6| and 44. The replacement ofthe called vsubscribers receiver interrupts the` energizing circuit of the supervisory: relay SR which also restores to normal. The ,restoration of Acontact29 of SW to normal breaksthe locking circuit of the link channel relay |LC which releases-the rst channel and prepares -it for subsequent seizure by another calling line. l

Cil

Having described my invention, what Ihclaim is new and desire to .secure by United States-Letters Patent is:

1;v An automatic telephone system comprising a plurality ofA subscribers lines, a plurality of channels for interconnecting any twoY of said lines, horizontal commons connected to. relay contacts in each channel, vertical commons for each channeliconnected to other contacts of the said relays, channel selecting means consisting ofx relays exclusively for automatically selecting an idle channel and connecting a calling line thereto through the medium of said relay contacts.

2. An automatic telephone system comprising al plurality of subscribers lines, a plurality of channels for interconnecting any two of ,said lines, horizontal commons connected to relay contacts ineach channel, verticalcommons for each channel connected to other contacts of the sai'darelays, channel selecting means consisting of relaysexclusively for automatically-selecting an idle channelV and connecting a callingline thereto through the medium of said relay contacts, andzmeans for.V rendering busy said selected channel.

3; An all-relay telephone system comprising subscribers lines, a: pluralityy of channelsV each comprising a connector circuit and a: selector circuit for interconnecting said lines, .horizontal commons associated with individual calling lines, vertical commons associated. with individual channels'and means for: connecting said horizontal and vertical commons;

4. An all-relay'telephonesystem comprising subscribers lines, a plurality of channels, anconnector circuit and a selectorl circuit for each channel for: interconnectingsaidv subscribers lines, horizontal commonsassociated withindividual calling subscribers lines and allthe channels', vertical commons associatedwith individual channels and allthe lines and. means for con.- necting said horizontal and-vertical commons;

5'. An all-relay telephone system comprising subscribers lines, a plurality of channels, a connector circuiti and a': selector circuit for each channel for interconnectingsaid; subscribers lines, horizontal commons for each line associatedxwith all the channels, vertical commons for each channel associated with` all the lines, a line channel relay foreach line` operable `toV connect the horizontal commons for that line toa set of vertical commons anda channel selecting relay for each channel controlling said linechannel relay.

6. An all-relay telephone system comprising subscribers lines, a plurality of channels for interconnecting said subscribers linesy channel selecting means operable upon the initiation of a call comprising a line channel relay for each line in each channel, a channel selecting relay for each channel, the channel selecting relay of the rst idle channel operable upon the initiationA of al call to operate the line channel relay associated with the calling linetov connect the said line to said idle channel. Y

'7. An all-relay telephone system comprising subscribers lines, a plurality of channels for interconnecting said lines, horizontal commons extending each lineto each channel, vertical commons for each channel associated with each of said lines, a relay operable to connect the horizontal commons of a-callingline to the vertical commons of an idle channel, and relaymeans controlling said relay.

8. An all-relayV telephone system. comprising calling and calledlines, a plurality of channels for interconnecting-said lines, horizontal commons foreach line for associating each line with each .channel and vertical commons forrassociating each channel with each line, a connector circuitanda selector circuit for each channel, relay means operative upon the initiation of acall to select an idle channel, dialing means at said calling line, and means responsive to said dialing means-,to connect said calling line to a-called line.

9. An all-relay telephone systemcomprising calling and called lines, a plurality of-channels for interconnecting said lines, horizontal commons for each line for associatingxeach line with each channel and vertical commons. for associating each channel .with each line, a connector circuit andazselectorcircuit for each channel, relay means operative upon the initiation of a call to select an-idle channel, dialing means at said calling line, means responsive to said dialing means to connect' said calling line to a called line, and means preventing said connection if saidcalled line is busy. l

10. An all-relay'telephone, system comprising calling and called lines, a plurality of channels for interconnecting saidlines, commons associated with individual channels, channel selecting means comprising aline channel relay for each line located r in the 'respective channels.

11. An all-relay telephone system comprising calling and called lines, a plurality of channels for interconnecting said lines, commons connecting each lineto each channel and eachchannel with each line, channel selecting meanscomprising a line channel relay for each line located inV the respective channels, and achannel selecting relay individual to a channel controlling the line channel relays in the channel;

12. An Vautomatic telephone system comprising subscribers lines, a plurality of channels for interconnecting two of said lines, horizontal commons individual to the lines, Vertical commons individual to the channels, a line channel relay for each line in each channel, operable to connect the horizontal' and vertical commons, a channel selecting relay in each channel'controlling the said line channel relays in the respective channels, and circuit connections for said relays whereby the channel selecting relay in the first idle channel operates the line channel relay in that channel associated with the calling line.

13. An automatic telephone system comprising subscribers lines, a plurality of channels for interconnecting two of said lines, horizontal commons individual to the lines,l vertical commons individualto the channels, a line channel relay for each line in each channel, operable to connect the horizontall and vertical commons, a channel selecting relay in each channel controlling the said line channel relays in the respective channels,V circuit connections for said relays whereby the channel selecting relay in the first idle channel operates the line channel relay in that channel associated with the calling line, and means for extending another call to the next channel.

14. An automatic telephone system comprising subscribers lines, a plurality of channels for interconnecting two of saidlines, horizontal com- -mons individual to the lines, vertical commons individuallto the channels, aline channel relay for each line in each channel, operable toconnect Vthe horizontal and vertical. commons, a. channel selecting relayy ineach channel controlling the said line channel relays in the respective channels, circuit connections for said relays whereby the channel selecting relay in the rst idle channel operates the line channel relay in that channel associated with the calling line, and means preventing the operation of the channel selecting relay associated with a busy channel.

call to select an idle channel, said channel selecting means comprising a line channel relay in each channel connected to individual respective lines by horizontal commons, vertical commons for each channel extending from contacts of one line channel relay to contacts of another line channel relay and relay means operable to operate the line channel relay associated with a calling line to connect the horizontal and vertical commons at that point.

GLENN KINER.

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