US1578417A - Automatic telephone-exchange system - Google Patents

Description

March 30 1926.' 1,578,417

G. FRUBING AUTOMATIC TELEPHONE EXCHANGE SYSTEM Filed sept. 1, 1921 Patented Mar. 3o, 1926;

UNITED STATES PATENT l oF'FlcE.l

HALSKE AKTIENGESELLSCHAFT, 0F WERNERWERK, SIEMENSSTADT, NEAR BER- LIN, GERMANY.

AUTOMATIC TELEPHONE-EXCHANGE SYSTEM.

Application led September 1, 1921. eria1 No. 497,679.

. l (GRANTED 'UNDER THE`IROVISIONS 0F THE ACT 0F MARGH 3, 1921, 41 STAT. L., 1313,)

i7 '0 all 10h30/m it may concern Be it known that I, GEORG FRBING, a citizen of the German Empire, Fesiding at Berlin-Vilmersdorf, Germany, have invented certain new and useful Improvements in Automatic Telephone-Exchange ,Systems (for which` I have filed applications in Ger many, May 2, 1916, Pat. No. 299,512, and Austria, May 2, 1917, Pat. No. 80,904), of which the following is -a full, clear, concise, and eXact description. K

This invention relates to automatic telephone exchange systems and particularly^to automatic telephone systems in which long distance or toll connections are established.

by means :of the same connector switches used in establishing connections between two 'local subscribers. y

Inv order to make possible the use of. the same connectors for the local and toll traffic, it has been proposed to provide toll operator controlled switching means at theconnector, in addition to the switching means controllable for the setting of the 'connector in a local connection.

T he -drawback of such arrangement is that if the desired line, Which is temporarily seized by the connectorunder the control of a toll operator,is idle, then, upon the seizure ot' this'line in response to this preparatory setting up of the toll connection, the desired line will be guarded against seizure. The temporary toll connection makes thedesired line busy t0 local subscribers although this line is not in actuall use.

It has been proposed to test and guard the local lines under the control lof switching apparatus associated with the connector and actuated at will under control of the toll operator, rather than in response to the setting of the connector switch onto ,the terminals of the desired line. This arrangement, however, contemplated the use of switching means in addition to the switching means associated with the connector for controlling its setting, and therefore increased the cost ot operatipn.

It is the object of the present invention to provide a connector arrangement whereby a toll connection may be prepared for completion Withut seizing .the called line, that is vmaking it test busy, andin-which the switching devices associated with the combination connector (for local and toll trailic) are reduced to aminimum. i

According to the main feature of the in.-

tol

vention, in response to tliepreparatory setting of a connector switch in a long distance connection, the' guarding of the desired local line and also the further operations for completing the connection (testing of the desired line engaged in a. local or toll connection, establishment of the talking circuit, supply of talking current, etc.), are operable under the control of the toll operator, independently of operations performed during the setting of the connector. The cir- .cuits are so arranged thatthe toll operator when preparing the establishment of a connection, isiirst connected to the desired local subscriber in order to inform lhim of the longpdistance call if he is'engaged in a local ponnection.

The complete establishment of the toll connection may be accomplished under the control of the toll operator in the same matr.

ner as the change-overirom the vertical to thev rotary motion `of the switch isl accomplished, or in the same manner as the connector is changed from local to long distance use.

According to another feature of the invention, the' complete establishment of a prepared toll-connection is accomplishedv in response to the same operationsvas are'performed upon the completed setting of a connector on a line in a local connection, whereby, in addition to the testing and guarding, I

of a local line desired in a toll connection, the desired line may be signaled under the control of the toll. operatorbythe ringing arrangement associated withsuch connector, and at the same time an existing local connection may be severed.

'l In the drawings, Fig. 1 shows the circuits of the connector switch, arranged to be op-.-

of the various relays are not shown in their operative relations to such relays. The. armatures of each relay are marked by a small letter corresponding to the capital designating the electromagnet of the relay. In order to distinguish between the various arclosing a circuit from battery, xv,

matures of the` same relay, suflixes are used 1n addition to the letters. The relay ar'- matures are shown 1n their normal positions.

Sett/mg of the connector in a local connection. v

Upon the seizure of the trunk a, Z), c leading to the wipers of the connector, relays A and B become energized in the well-known manner. Relay X does not become `energized because it is differentially wound.

vPrior to the sending out of impulses for causing the connector to move 1n avertlcl direction, the calling subscriber depresses keys K1 and K2,

In orwhereupon relay-X becomes, closes its contacts switch wiper S1", and ma et SSM to'. ecomes ener-- ground. The magnet .SSM gized, and uponthe deener ization of relay X, the magnet becomes eenergized, and

vcauses the noyeliient of the side switchwip ers out of osition 1 into position 2. Prior to the sendlng out of the rotary impulses, the

relay Xfis againv energized as before.` By operating key 1K1 the subscriber causes the Voperation of relay A, but now due to the fact that side switch wiper SVII is in its second position, therotary magnet RM is operated instead of the vertical magnet, and under-I l control of this magnet the wipers of the con` nector are rotated step by step. After the last rotar impulse has been sent out, relay X again circuit from grounded battery, through RON, w3, SVI, SSM to ground. c

The desired line is testedv 'n position 2 ,of the side switch. The relay B, upon its en-` ergization, closes a circuit vfrom ground through ON.1 for relay U, which becomes energized and closes a lockingcircuitI for it-\ self through contact us. Oli-normal contacts ON1 open upon the first vertical step of the switch wipers. Relay U- by 'closing its confv tact U", prepares ,an energizing circuit for the I windlngof relay R, which circuit is completed Nupon the deenergization of relay X. Relay R becomes energized, and closes its 'contacts r3 and 719 for preparing the ringing circuit. The relay R closes at itscontact T19 a circuit for relay T, and if the line upon which'the connector switch is [set is idle, the test relay T becomes energized and t and 1512, whereupon the energized.` Relay X closes contact thus ,.ringing circuit is corr leted and the called the lower half of the left winding of B to Relay B, being'slowito release, does not fall oli. Another circuit is closedfrom battery,

through av, the upper halt of the left winding of B, lower winding of \X, conductor b and key K2 to ground. The current which now flows through the lower winding ofX isv in a direction to assist that through 'the upper winding. The currentflowing through the lower halfof the-left winding of B is greater than that through the upper vhalf, and thus B remains energized.4 In order to send out thevertical impulsres the call ing subscriber operates key K1 fo operating relay A. Upon each deenergization,` relay A closes a 'circuit from grounded-battery,

.through w1, a2, VM, Smito ground. y Under the cont-rol ofthe Vertical magnet, the .wip

ers off the connector are moved step by step in anv upward direction. f Aftenthe sending out of the last vertical. impulse. the ground is disconnected from the a' and b conductors,

' whereupon relay X becomes deenergized,

ilsubscriber is signaled. f The circuit for rela-y ground. Texterds'from ground through both wind;

ings'in ser-ies,contacts r1, wiper S', and test brifsh, tol contact 42, and thence to battery. Following testing, magnet 'SSMreceiVes an impulse through interrupter I1 and moves .thekside switch, wipers into positionl 3.' In this .position of the side switch wipers, the winding II ofthe ringingA relay R is connected tothe interrupter I3, contact 1v of relay Ubeingclosed. The interrupter Isis so arranged that the. ringing relayA is operated in 4intervals of ten seconds. U onthe removalof the receiver at the cal ed station, and during a silent peiod ofinterrupter I3,Qrelay 'Y becomes energized. This relay by closing its' contacts A14:, short-circuits ,thewindingof relay U, which upon deenyergization' ope'ns at. its 'contact 'zt-13 the circuit Yof winding lII of thel ringing relay;

l'.lheLtest relayfwhen energized, short-circuits 'its high resistance windinggI 'in its contact t and thus guards the called line from seizure by other connectors; The local connection lis now completely established.

If the desired line is busy, th'en.l in position 3 of the sideeswitch, ,the test relay has eco'mes deenergized, and closes a not become-energized, and the calling party is informed in -the well-knoWn-manner of -connection the desired subscriber restores his receiver to the switchliook, the relay Y b'ecomes deenergized, and connects interruptcr I2 in circuit with the magnet SSM. Upon the energization and subsequent deenergization of the magnet SSM, the side switch Wip- -ers are movedinto position 4. lVhile the side sivitch Wipers are moving from position '3 to 4 and in position 4, the relay T remains energized. The holding circuit of relay T may be traced l from grounded battery through resistance 4, SIX, TH, to ground. A circuit 'is therefore closed through `the test conductor c, S?, (posit-ion 4), t1", u2 and conductor a forcaiising the operation of the calling subscribers register (not shown).l

vThe circuit closed to actua-te. the register, Aalso causes the release of'the selector by means of which the calling line has been eX- tended to the connector, whereupony relays A and B become deenergized. The above described circuit is "then established for SSR and CR for releasing the side switch and the ,connecten If the calling Siibscriberhangs up his re' ceiver after-a successful connection has been established, then the above described 'regisi. i` circuit is completed from conductor c, through armature 622 of the relay B, Whereupon in response to the restoration ofthe re-v ceiver at the called substation and the subsequent deenergization `of relay Y, the side-- switch andthe connector are released in the above described manner.

Setting of the connector in atoll connection.

The connector is moved in a-vertical and rotary direction for seizing the desired local line in the same manner as above` described and 'is under the control of a toll operator whose sender comprises keys' (Fig- 2) simi- A lar to those 'of alocal subscriber. After the last rotar impulse has been sent out, the relay B` ecoines temporarily deenergized, due to the connection of an' opposing battery connection tothe b conductor at the sending statiomas by means of a key K3.

Relays A and X remain energized. The-fol:

lowing" circuit is now established: grounded The called line is now ft'ested.'

battery, b2", a2", Sn (position 2), relay V,

. to ground. Relay vV'becomesv energized and closes a locking circuitfor itself through its armature V29' and the-armatiire a of relay A. `In response to the temporary deenergization of relay B, relay U also becomes.

(leenergized. Due'to the fact, however, that relay X is energized and maintains its ai'- mature m21 attracted, the release magnets of the side switch and the connectorare not operated. i

/ The tolll operator noiv'causes thel relay X to restore its armaturcsaaml relayB to pull.

up its armature, relay A being maintained operated. The magnet SSM receives an iinpulse through interrupter 11- and the armature 3'of relay X, and causes the lmovement of the side switch Wipers out of position 2 and .into position 3 iii the above Vdescribed manner. In this position ofthe side switch Wipers, the line on the terminals of which 'the connector has been set isneither tested nor guarded, because relay U maintains the circuits of relay R openl (in u andv 1013),;

and relay` RA in turn maintains the test cir' cuit open (in 911). The connector remains in the set position until' further' operated lunder the control of the toll operator.' 'Thus Athe connector is set to Vprepare a 4toil connection. l

As soon as the tollopera'tor decides to complete the 'toll connection, she will cause the temporary deenergization. of relay B and the energization of relay X, as by operating keys K1 and K3 (Fig. 2). The toll loperatorcauses the energization of relay X byV Adepressing 'keyt' K1 as previously described, and. by Ioperating key K3, connectsv an opposing' battery to the conductor which causes the B relay to become itemporarily deenergized.v In response to the short deenergizat-ion of the relay B, the magnet SSM becomes energizedl and 'deener- 1 f gized'and moves theside switch wipers into position 4. The circuit maybe traced as follows: fromlgrounded battery by way of b2 and its restingcontact, a. and its wor ing' contact, side switch -Wiper SII in third position, side switch Wiper SVI in third position thru side switchmagnet SSM to ground.

If the-called line vis enga ed ina toll iio connection, the test relay T is s ort-circuited through a conne'ctorholding` the'ca`led 1in-e', the side switch wipers of this .connector being in position 8.- The magnet SSM is op ei'ated b interrupter .Iythe cont-act /vhof relay -.being closed. wipers then move into position 5, and in viewof the'factthat rela-y T is not ener- "gized, a. circuit..is closed from" groiinl' The side switch` through fthe, secondary'iwinding of a toll .A husy signal, *SW-1.1 (p 'ition.5) Aarmature fvffof relay, armature of relay T and coils f 36 to groii 'ndij\' The toll oni no " circuit extends from leases the connector or leaves itin the set position 'until .the called line becomes idle.

If the desired line is idle, relay T be.-

move into position 4, the circuit leing closed from grounded battery, through resistance 4, SIX (position 4), TII vto ground. The magnet SSM receives. an impulse through 'U33 and moves the side switch wipersinto position 5. While the side switch wipers are moving from position 4 to 5, and in position of these wipers, the relay T is maintained energized by current flowingrin the following circuit: grounded battery, resistance 4, 'SIX (position 5), o, 1522, TH, to ground. At the same time a busy potential is connected to the test terminal ^42 of the called line through a resistance 3 and SY (position 5)'. c

If the desired subscriber is engagedt in Iconversation with a local subscriber, then upon the completed setting of the connector under the control of a toll operator and the movement of\ the, side switch wipers'- into position 4.relay'l B being tem oiarily deenergized, relay T becomes energized. The grounded battery through resistance 4, SIX (position 4), T, ground. The magnet 'SSM then ,receives an impulse through I2 and 033, and causes the movement of the side switch wipers into position 5. 'The toll operator now hears the conversation on the line and understands thereby that the called subscriber is engaged in. a local'conversation. Thel toll opeator then informs him of the incoming toll c'all and the impending severance. of the local connection. The toll operator then again causes the temporary'deenergization of relay B.v A circuit -is now closed from grounded battery, through b2, a", l`SII (position 5), S"I (position 5), SSM, ground, and upon the subsequent energization of relayI B, the magnet SSM causes the side switch wipers to move into position 6; In this position`of-the side'switch, a circuit is closed through I2, v3?, b and SVI for the magnet SSM, and the side lswitch wipers are moved into position 7 The side switch wiper Sm now connects a ten-volt battery to the a conductor-of the local connection, and side switch wiper SWa ground to the .b conductor of the local connection. In response f to-this, the local connection is severed in the well-known manner, as described' in British Patent' No. 2,672 of 1912. If the desired subscriber. was the calling party of the local connection, then his line switch is released, and if he was the desired party in the local connection, the connector of that connection is released. Battery is then su plied through test terminal 42, side switch V and conductor 4 8 to the II winding of `relay Y. This. relay becomes energized and attracts its armature Y. AThe interrupter I2 is then connected to the magnet SM, and the latter causes the movement of the side switch wipers into position 8. lf thedesired subcomes energized when. the side swltch wipers scriber has replaced his receiver, relay Y will be deenergized. The toll operator may then cause the signaling of the desired substatlon. B and energizing relay X, the operator may cause the establishment of a circuit for the ringing lrelay from grounded battery, through'- "b2", @27, SH, RI, y, to ground. lVhen the called subscriber removes his re- By temporarily deenergizing relay"- ceiver from the Switchhook, the relay Y is energized| by a circuit including the conductors@y and b 1n series.

actuated, whereupon she causes the severing of the connection, by the removal ofk her cord circuit from the jack in which the conductors a, b, and c terminate. Relay B becomes deenergized and in the same manner 'as -above described, causes the energization lofthe magnet-s SSR andvCR for releasing f the sideswitch and the connector.

)Vhat is claimed is: f

1. In 'a .telephone exchange system', -a connector switch having movable ,an'dl'sta-tion'- ary contacts, tolllines arranged yfor conjnection to said movable contacts, local lines 1 terminatingin said stationary contacts and arranged for connection to( said movable contacts, means operable through anyone of said lines for causing said connector to move its movable contacts on to the stationary contacts of a desired line,` automatic testing mea-ns associated with said connector for testing the busy or idle condition of the, desired line, 'automatic l guarding means-associated with said connector-for `Inaltinglthe line connected with; busy, auto-- matic switching means operable in response to the setting of said connector over a local line for operating lsaid testing andg'u-arding 4 meansfmea-ns lcontrollable through a toll line in making connection with the desired line for preventing `the operation of said-` testing and` guarding .means so that saidl desired line kwill not busyto other switches, andv a"manually operable 'sw-itch operated at will for controlling the yoperation of said testing and guardingV means through a toll. line to lguard against seizure of said desired line by 'otherfswitches f'f 2. In a telephone system, connector contacts, toll lines arranged for,v connecti 1 ,switchesfi having movable and stationy Y to said movable contacts', loca-1' linestermif nating in said stationaryv contacts. and ar^ ranged for connection to-said vmovable .con- ,T169

' for connecting with the stationary terminals thereto.

of a desired line whether said line is busy or not, mea-ns for maintaining Said last mentioned connection without making said line test busy toother connector switches having access thereto, and meansthereafter controlled at will bythe operator for com? p leting telephonie connection with said desired line and for making said line busy tol other connector switches having access thereto.

3. In a telephone system, a connector switch having movable and stationary con- Vtacts, toll lines arranged for connection to said movable contacts, means operable through any one of said lines for causing said connector to move its movable contacts on to the stationary contacts of a desired line, means for connecting with the stationary terminals of a desired line whether said line is busy or not, and means effective if the line is idle for maintaining saidlast mentioned connection and for preventing said connector from making said yline test busy to otherconnector switches having access 4. In a telephone system, a connector switch having movable and stationary-contacts, toll lines arranged for connectie to said movable contacts, means operable through any one of said lines for causing said connector to move its movable contacts on to the stationary contacts of a vdesired line, means for connecting with the stationary terminals of a desired line Whether said line is busy or not, means for maintaining said last mentioned connection without makingvsaid line test busy to other connector switches having access thereto, and means thereafter controlled at will by the operator for completing telephonie connection with said desired line and making the saine busy to other connector switches having accessv thereto. l l

5. In a telephone system, a toll connector drectively controlled by an operator for selecting a desired line, means in said conne-3- tor for testing the selected line, means for preventing the operation of said testing'y means when the line is selected, and opera-l tor controlled means for causing the testing operationto take place at any desired time thereafter.

6. In a; telephone'system, a toll connector directively controlled by an operator for selecting a desired line, means inl said con,

nector for -making the selected line busy ins ca set is idle when Selected, and means for preventing the operation of said busying means Iwhile maintaining the connector in operated selective position.

' 7 In a. telephone system, a toll connector directively controlled by anoperator for selecting a desired line, means in said connector` lfor testing the selected line, means for preventing the operation of said testing means when the line is selected, operator controlled means for causing the testing operation to take place at any desired time thereafter, and means effective in case the line is found busy for completing or barring the connection depending on whether theselected line is busy in a loc-al connection or in a tollconnection'.

8. In atelephonev system,- a combination toll and local connector for use by an operator or by local subscribers in selecting and connecting with called lines, means in said connector for testing a called line as soon as selected in case the connector is in use by 'a local subscriber, and means for delaying and connecting with called lines, means in said connector effective automatically to make 'an idle called line busy as'soon as the same is selected in case the'connectoi' is in use by a local subscriber, and means whereby' in case the said connector is in use by the operator an idle called line is made busy at the will of-the operator.

10. In a telephone system; a combination toll and local connector for use by an operator or by local subscribers inv selecting and'connecti'ng with called lines, anfl busy testing means in said connector operable automatically or at the option of the calling party depending on whether said connector 1s being used by a local subscriber or by the operator.l i i 11. In a telephone system, a. combination toll and local connector for use by an operator or by local subscribers in selecting and connecting with called lines, a multi-position switching device in said connector. la test circuit closed in one position of said device if the connector is in use'by a local subscriber and closed in a different .position if Said connector is in use by the operator.

12. In an automatic telephone system, an automatic switch controlled by an operator` for selecting a subscribers line, a key at the operators switchboard,- and means in said switch requiring two successive actuations of said key to signal the called subscriber.

13. Im an automatic telephone system, an automatic connector switch controlled byan operator for selecting. a subscribers line, 'said line remaining in idle condition,means controlled by the operator at will for making said line busy, and additional means means controlled by the operator at will for thereafter controlled'by the operator at will makin` said line busy and ringingk the called v for signalling the called subscriber. Subscrl r. 11

' 14. In -an automatic telephone system, an In Witness whereof, I hereunto subscribe automatic connector switch controlled by my name.

an operator for selecting a subscribe'isline, ,said line remaining in idle condition, and GEORG FRUBING.

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