US1505715A - Telephone system - Google Patents

Description

' 1,505,715 M. LANGER TELEPHGNB SYSTEM Filed Aug. 29 1921 TI-Luau [Jrjifazc Lawyer ETZE."

Patented Aug l9, 1924.

n it E S new MAX LAn'eEn, or I-I-ERIVIMSKDORF, ,NnAn. BER-LIN, GERMANY, esszqrion TO AU'IQ'MATIC ELECTRIC COMPANY, or CHICAGO, ILLINOIS.

TELEPHONE s'Ysrnr/L I Application filed August 29, 1921. Serial nofee'seei (GRANTED UNDER THE mnvisimasor THE Aer or Manes i921; arsrA'r. L, 1213.

To all whom it may concern.

Be it known that I, MAX LANGE'R, a German citizen, and. a resident of Herms dorf bei Berlin, Rodernstrasse 58, Germany, have inventedcertain new; and useful 1m; provements in Telephone Systems (for which I have filed application in Germany, application No. S 53922 VIII/21 dated August 10, 1920) of which the following is a specification. I

This invention relates in general to cir cuit arrangements for a two wire junctidn leading from an antomaticexchange to another exchange in which the testing for engagement is eifected over .only"one ofthe two wires. A feature of the arrangement is. that in addition to the blocking means at the outgoing end of the line, blocking means is also provided at" the other end under the control of connecting arrangements at this end, which prevent the line being taken into use when the line is oiit of order orclosed for service. The blocking means at the incoming end of the line controls the testing arrangement at the other end over the test lead.

According to the present inventicn switching means are provided for connect; ing' at the incoming end of the'tes't leader the trunk line potential that difie'r's' from the blocking potential providedatthatend of the line, thereby setting in" action" the metering arrangement at the outgoing end of the test lead. The trunlrlead iised for testing can thus be used not only for controlling,

the testing arrangement by means of the blockingineans at the incoming end of the line, but also for additional switching processes, such as the metering and release of a connection. Preferably the meter potentia'l is connected to the te-st lead eitl ier 'after the connection has been completely set up or at the end of the conversation.

Furthermore the invention enables the selecting device to be released directly by the metering potential through the registering arrangement by means of one of the slow acting devices so that the releasing process is effected over the test lead in the direction from the outgoing end to the incoming end.

The drawing shows diagrammatically an example of carrying out the invention. The

contacts are given reference numbers and also small letters which indicate the wind I ings. marked in capital letters by which they are operated; thus the double wound relay A has armature contact 34.

il Vhen the receiver is lifted at the substation Ta the preselector is set in known manner on afree first selector I GW. The relays T and C are operated from earthed battery contact '1, windings .I and II of the relay Tytest arm of the preselector VW, Winding I of theslow acting relay C, oil normal contact Z0 earth. 1

The relay T short circuits at contact 2 the circuit of its high resistance winding I and switches the subscribers line through tothe first selector I Gl/V at contacts 3 and 4-; At the first selector I GVV the relay A is operated and closes a circuit from earthed battery, winding not the slow acting relay C, winding I ofthe slow acting relay V, contact s fi, 6 earth. The operation'of slow acting relay V Opens at contacts 7 the cir cuit of the release magnet M. The contact 8 is closed but the contact 9 controlled by relay A is opened hence the slow acting relay 1V is not operated; At each train of number impulses the relay V is' however eneigized and serves .then as a switching relay forthe first selector IGlV, the second selecline VL, contacts '12, 1'3, winding I of the test arm of the first selector I GVV.

relay F x p II of the test relay I, contact 14".

winding windingl of the test relay P earth. The

test relay P is operated inthis circuit and short circuits at l5 its high resistance winding I, thereby the b lead of the trunk line is blocked at the outgoing end. The relay; Fis at first not operated owing to the differential effect of its windings II and III. 'Ihesubscribers lines are connected through at contact 16, 17, to the tree trunk line. Furthermore the circuit of the release 11mg net M is opened at contact 18. At the first number impulse which operates the second selector II GVV, the relay W is energized over contacts 8 and 9, while the winding I of the relay E is energized in a circuit from earthed battery, relay A contact 118, trunk lead a, winding I of the relay E, contacts 16, 33 and 3 1, earth. Thereby the contacts 19 and 20 are closed and 21 opened. The relay E locks itself in series with the windings II and III o't'the relay F. The b-lead of the trunk line is switched through at contact 20, thereby the test relay 1? is disconnected from the b-lead and the windings II and III of the relay F are energized. finding I of the relay F no longer receives any current. By the energization of relay F, the contact 22 is closed, and thereby the winding I of the relay E is short circuited. At the first lifting step of the second selector II GIV the off normal contact 70 is operated, thereby the relay B, at the second selector II GIV is energized in a circuit from earthed battery,'resistance 0 contacts 31, 11, 17, 20,

b-lead of the trunk line, of? normal contact 70,, contact 23, windings I and II of the relay B earth The relay B, at 23 removes the short circuit from the winding I of the relay C, and closes contact at. The relay C however, is not energized because it does not receive enough current. The second selector II GW sets itself on a free connector. When thesecond selector reaches the tree connector LIV a test circuit is closed from earthed battery, relay (1,, winding I of the test relay P contact 25, winding II of the relay P earth.

-The test relay P is operated over this circuit and short circuits at contact 26, its high resistance winding II. It therefore at 27 and 28 switches the trunk leads a and I) through to the connector LIV and opens the contact 29 in the circuit of the release magnet M By the operation of relay C the contact30 in the circuit of the release magnet M ot' the connector LVV is: opened. During the transmission of number impulses for setting the connector LIV, the slow acting relay IV is again energized, and the con-. tact 31 is thereby closed. The relay B at the connector is now energized in the circuit from earthed battery, resistance o contacts 31, 11., 17, 20, trunk lead Z), oil normal con tact 22,, windii'ig I of the relay (l, contact 28, relay 13,, earth. Likewise during the train of impulses for the connector IIW, the relay A, is energized in a circuit from earthed battery, relay A contacts 32, 27, trunk lead a, contacts 22, 16, 33, 34, earth. lVhen the connection has been completed in known manner to the wanted subscriber and "when the latter has answered the relay Y through the winding I 01 the slow acting relay V, and the winding II of the slow acting relay C. The relay C is so arranged that it releases its armature a. little quicker than the slow acting relay V. Hence the slow acting relay V remains energized over:

its winding II and the (ale-ad of the trunk line VL in a circuit from earthed battery, winding II of the slow acting relay V, contacts a0, 41, 16, .22, trunk lead-a, contacts. 27, 37, resistance 0),, earth. When relay 0 is deenergized it closes, the contact 10 and thereby connects the meter relay ZR to the b-lead. This meter relay ZR, however, is

only energized when the wanted subscriber.

hangs up his receiver, since the relay Y at the connector LVV is then deenergized and closes contact 39 so that current passes from earthed battery ZP, contacts 39, 38, 28, winding I of the relay C ofi' normal contact 70 b-lead of the trunk line VL, contacts 20, 17, 10, meter relay ZR, earth. Through the energization of the meter relay ZR- the contact 42 is closed, and thereby the circuit of meter Z is closed, so that the metering is effected. Simultaneously with the energization of the meter relay ZR, the contact 40 is opened and thereby the winding II of the slow acting relay V is deenergized.

The deenergization of the slow acting relay. V causes the contact 43 tobe closed and thereby the winding II of the relay P is short circuited. The relay P releases its armature so that at contact 18 the following release circuit is completed: earthed battery,

17 breaks the circuit of relay ZR which,

The energized release opens contact 42. magnet M, atcontact 4:6 opens the circuit of the relay T at the pro-selector, so that the latter is also rendered tree. The release of relay P causes the deenergization of windings II and III of the relay F and ot the winding II of the relay E. The relays E and F are so arranged that the relay E releases its armature quicker than the relay F, hence the winding II of the relay F s short circuited at 21 after the relay E has been deenergized. The release of relay E also disconnects at 20 the b-lead of the trunk line VL, so that an increasedcurmeans I *3 rent flows over the-winding I'II ofthe relay F and the relay C from earthed battery,

winding III of the relay F, contacts 21,44, 12, Oil normal contact 70,, winding I of the relay C windings I and II of the relay B earth SP. The relay C is now energized. The operation of relays 'C, and B,

effect the short circuit of winding I of the relay P M in the following circuit: earthed battery, ofi normal contact release magnet M, contacts 45, 29, earth. The second se lector II GNV is thereupon released. Furthermore the actuation of the off normal contacts 70,, causes the free potential FP to be again connected to the trunk line; Subsequent to the release of the relay P the relay G at the connector is deenergized. Thereby the contact 30 is closed and release magnet M is therefore energized in the circuit, earthed battery, off normal contact 70,, release magnet M contact 30, earth. Thus the connector LIV is disconnected.

When the calling subscriber Ta' hangs up his receiver after the trunk line VL has been taken into use and before a train of impulses over the second selector II GVV has been transmitted, then the relay A at the first selector I GW is released and also the relay V because the earth potential at the resistance a, is missing at the a-lead of the trunk line VL. The release of the slow acting relay V short circuits the relay P so that this releases its armatures. Hence the contacts 7 and 18 are closed and thus the release magnet M of the first selector I GIV is connected up. By the release of relay C its contact 10 connects up the meter relay ZR to the b-lead of the trunk line. However, the relay E is not energized till the transmission of the first number impulse that operates the second selector I'I GIV and according to the abovementioned assumption has not yet been operated, therefore the b-lead of the trunk line VL has not yet been switched through at 20. Hence the meter relay ZR receives no current from the meter battery ZP. The meter Z is therefore not operated although the disengaged potential FF is equal to the meter potential ZP.

Having now described my invention What I consider to be new and desire to have protected by Letters Patent will be pointed out in the following claims.

lVhat I claim as my invention is:

1. In a telephone system, means including a train of automatic progressively movable switches for connecting a calling and a called line, means in the final switch for connecting a source of current to one of the talking conductors when the conversation is over with, said means being responsive only to the replacement of the receiver on the The relay P is therefore deenergized and thereby energizes the magnet called line, a mea-sured'service device for t-liecalling line, a controlling relay for said device, and means I'BSPOHSIVQ only to the replacement of the receiver on the calling line for connecting said controlling relay to said talking conductor to render such relay responsive to said current source.

2. In a telephone system, means includinga train of automatic; progressively mov able switches for connecting a calling and a called line, means'in the final switch for connecting a source of current to one of the talking conductors Whenthe talking connection'i s broken, aineasured service device for the calling line, a. controlling relay for said device responsive to said current source, and release inechanisin'in said switches also responsive to said current source.

3. Ina telephone system, means including a train of automatic progressively movable switches for connecting a calling and a called line, means in the final switch for connecting a source of current to one of the talking conductors when the talking connection is broken, a measured service device for the calling line, a relay in the first of said switches, means in said switch controlled over circuits excluding the succeeding switches for connecting said .relay to said talking conductor to render the same responsive to said current source, and a circuit over which said relay controls the said meter.

4. In a telephone system, a two conductor trunk line connecting two exchanges, a

meter controlling relay in the first exchange,

a two motion switch in the second exchange having a change over control relay, means in the first exchange for connecting a source of current to a conductor of said trunk during the setting upof a connection to operate a two motion automatic switch in the second exchange having. a change over control re lay, means in the first exchange for connecting a source of current to a talking conduc tor of said. trunk during the setting up of a connection to operate said change over control relay, and means in the second exchange controlled by the called subscriber for connecting another source of current to said conductor for operating said meter controlling relay,

6. In a telephone system, two exchanges, a two conductor trunk line connecting said exchanges, means including an automatic switch in each exchange for setting up a talking connection over said trunk line, the

switch in the second exchange being conof said trunk line, a measured service device associated withthe calling line, and a controlling relay for said device, controlled over said second conductor also.

7. In a telephone system, a trunk line connecting two exchanges,- an automatic switch in the first exchange for seizing said trunk line, a meter control relay and a test relay in said switch, a source of current in the second exchange for supplying current to said relays, said source being normally connected to a talking conductor of said trunk line, means for disconnecting said source after testing, and means for again connecting it for metering, contacts normally connecting two exchanges, a meter controlling relay in the first exchange, a two motion switch in the second exchange having a change over control relay, means in the first exchange for connecting a source of current to a conductor of said trunk during the setting up of a connection to operate said change over control relay, and means in the second exchange for connecting another source of current to said conductor for operating said meter. controlling relay.

MAX LANGER.

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