US1426818A - Telephone-exchange system - Google Patents

Description

H. CLAUSEN AND C. I.. GUODRUIVI.

TELEPHONE EXCHANGE-SYSTEM.

APPLICATION FILED D'EC. 28, H218.

Char/es 600m/w71.

H. P. CLAUSEN AND L. GOODRUIVI.

TELEPHONE EXCHANGE SYSTEM. APPLICATION FILED DEC. 28, 1918.

2 SHEETS-SHEET 2.

Conneco l fL v HENRY l?. CLUSEN, l'? MCO'NT VERNON, AND CHARLES L. GOODR-ULJI, OF NEW YORK, N. Y., ASSIGNORS TO WESTERN ELECTRIC COMPANY, NCORPORATED, OF N11-lijf YORK, N. Y., A CORPOR-.LTION 01u" NEN YORK.

TELEHONE-EXCHANGE SYSTEM.

Maaate.

Spec Fioaton. ci" Letters I'atent.

1Patented Aug. 22, 1922.

Application filed December 28, 1918. Serial No. 268,665.

T0 all wim/m t 'may concern.'

Be it lrnown that we, HENRY P. CLAUsnN and @Hannes L. GoonnUM, citizens of the United States, residing at Mount Vernon, in the county ot Westchester and State of N ew York, and at New Yorlr, in the county of New York and State of New York, respectively, have invented certain new and useful Improvements in Telephone-Exchange Systems, of which the following is a full, clear, concise, and eXact description.

rlhis invention relates to improvements in telephone exchange systems and has particular reference to an improved arrangement for controlling the operation of selectively operable switching devices employed in machine switching systems.

in automatic systems, false setting oit switches is often due to the calling subscriber operating his impulse sending device before a trunk has been seized leading to a selector switch designed to receive said impulses. This results in the switch being incorrectly set and a wrong number called..

An object of this invention is to avoid the calling of a wrong number by preventing` the operation or' a switch should a subscriber manipulate his impulse sending device before the circuit, over which the impulses are to be transmitted to said switch, is complete. In accordance with this object, each selector switch is provided with means which remains effective while the switch is in normal position, but which is rendered ineiiective upon the first step of the switch under certain conditions. Another means preferably similar to that at the selectors is placed at the sending device and remains inactive until said device is actuated. rlhe line relays of the selector switches are adjusted to operate when one of said means is effective but will not energize whenA both are simultaneously effective. Therefore, should the subscriber operate his dial before a'trunk leading to a selector switch which has been seized. the means at the sending device is made effective, and upon seizure of said trunk, the means at said switch will also be rendered effective with the result that the line relay of the switch will not energize, the set of impulses Jtrom the sending device will be lost and a connection will not be established with a terminal leading to a called line.

The inventive idea involved is capable of receiving a variety of expressions one of which, for the purpose of illustrating the invention,` is shown in the accompanying drawings; but it is to be expressly under- -stood that said drawings are employed merely for the purpose of facilitating the de# scription of the invention as a whole and not to dene the limits thereof, reference being` had to the appended claims for this purpose.

1n the drawings, Fig 1 is a diagrammatic illustration of a calling substation, a line finder and a selector switch. Fig. 2 illustrates diagrammatically a connector switch and a called substation.

lt is believed that the invention will be best understood 'from a detailed description of the operation in establishing a connection between a` calling and a called substation. The subscriber at substation A, by removing` his receiver from its switchhook, completes a circuit for line relay 100 of the line finder B extending from grounded battery, left winding of relay 100, outer armature and.

back contact of cut-ofi' relay 101, substation apparatus A, impulse sending device C, conductor 102, contacts 103, conductor 104, back contact and inner armature of relay 101 and right winding of relay 100 to ground. The energization of relay 100 completes a circuit from grounded battery, lett winding of said relay, outer armature and back contact of relay 101, conductor 105, contact spring 106, back contact and lett armature ot relay 1.07, and. winding .of relay 10S to ground. Relay 108, by attracting its left-hand armature completes a locking circuit for itself, which is independent of the leit armature and baclr contact of relay 107. ln attracting its right armature, relay 108 completes a circuit from grounded battery, winding oi slow-to-release relay 109, right armature and front contact ot relay 108 to ground. Relay 109, by attracting its right armature, completes a circuit for relay 107 extending from grounded battery, winding of relay 107, right armature and front contact oft relay109 to ground. Relay 107 lenergizes and at its right-hand" :armature maintains the release circuit of the line linder B open during the operation of this switch. Relay 109 at its left armature completes a circuit 'from grounded battery, winding of primary stepping magnet 110, sideswitch wiper 111 in its first position, back contact and armature of secondary stepping magnet 112, armature and back contact oit' magnet 110,v armature and back Vcontact ot' release magnet 113, side-switch wiper 114 in its first position, lett armature and trent contact of relay 109, right armature .and front contact of relay 108 to ground. Primary magnet 110 interrupts its own circuit and continues to operate until the wiper 115V engages the contact 116 associated with the group ofvlines containing the calling subscribers Aline.'l then so engaged, a ground will be found on said contact which ycompletes a circuit from grounded battery, 'winding of primary magnet 110, winding ot escape magnet 117, side-switch wiper 118 in its first position, wiper 115, contact 116, right armature and trent contact et relay 108 to ground. Primary magnet 110 is maintained energized'by the current vflowing fthrough this circuit, thereby preventing further stepn ing of the switch in the primary direction. scape magnet 117 is also energized `by this circuit and upon its energization moves. the side-switch wipers into their second positions. In this position, primary magnet 110 and escape magnet 117 are. maintained energized overv a vcircuit extending from grounded battery, winding of primary magnet l110, winding vof escape magnet 117, side-switch wiper 118 in' position 2, sideswitch wiper 114 in position 2, 'lett-hand armature and front contact of relay 109, right-hand armaturev andtront contact ot relay 108 to ground. A circuit is new closed for the secondary stepping magnet 112 extending from grounded battery, winding ot magnet 112, side-switch wiper 111 in its second position, baclcontact and armature ot magnet 112, right armature and trent contact of escape` magnet 117, right armature and back contact 'ot' release magnet 113, sideswitch wiper 114- in its second position, lett armature and front contact of relay 109, right armature and iront contact oit relay 108 to ground. This stepping circuit ttor the secondary magnet 112 is maintained until. th c brushes 119, 120 and 121 oit the line linder B engage the terminals 122, 123, 124- oit the calling subscribers line. When so engaged, a circuit is completed i'or cut-ott relay 101, extending trom'grounded battery, wind--A 'ing ot relay 101, terminal 122, brush 119, lett armature of escape magnet 117, resistance 127, side switch wiper 114, left-hand armature and front contact ot relay 109, right-` hand armature and liront contact ot relay 108 to ground. Relay 101 energizes and breaks the locking circuit tor relay 108 at the outer armature and back contact ot said relay 101. Relay 108 releases and'opens the circuit for escape magnet 117 which deenergizes and moves the side-switch wipers linto position 3, lCut-oitrelay 101 remains enermessie gized in this position ot the side switch over a circuit extending from grounded battery, winding of relay 101, terminal 122, brush 119, contact spring-125, contact 126, left armature and back contact oli release magnet 113 to ground.

Assuming that the subscriber at the substation A had not operated the impulse senading device C previous to the movement ot the side-switch wipers ot the line iinder switch B to their third positions, the movement of the ` wipers 128 and 129 to `such position willl extendthe calling subscribers line to the first selectorl switch D, atA which time a circuit will be'closed tor line relay 200 of saidselector switch extending from grounded battery, lett winding ot relay 200, resistance 201, side-switch wiper-202 in *position 1, the lower side` ot the telephon'elin'e, substation apparatus A, sending device C, conductor 102, contacts 103, conductor 104, upper side of the telephone line, side-switch wiper 203, and right winding otl relay 200 to ground;

Howevem'should the subscriber at substation A manipulate the'dial ot the sending device C previous'to the movement ot wipers 128 and 129- to position 3, contacts 103 at said sending device will be opened and the resistance 130 included in the subscribers line. Relay 100 will, however, continue to be energized and the line finder switch will operate to connect the calling line with selector switch l), at whichtime the two resistances 130 and 201will be inl series. v Relay 200 is so adjusted that the same will not energize when these resistances are in series and consequently the selector switch will tfail to respond to impulses transmitted from the sending device C. It will, therefore, be apparent that the set ot impulses designed toA operate the sel'ectorcswitch D will be lost and succeeding impulses for operating the other switches will. tail to establish a conneetion to terminals leading to the called line.

New, assuming again' that the sending device at substation A was properly operated and` that relay 200 ot the selector switch l) became energized upon movement ot the side-switch wipers-128', 129 to position 8,V energiaation et relay 200 will close a` circuit for slow-to-release relay 204I eX- tending trom grounded battery, winding ot relay 2011, trent contact and armature ot relay 200 to ground, and relay 204e will become energized. t is to be noted that during the operation oi the sending device, resistance 180 will be included in the circuit with resistance 201 until switchl D is stepped from normal but relay 200 is so adjusted that thc same will not release when said resistances are in series. The switch is now in position to receive the first series ot impulsesA transmitted from the sending device at substation A and in vresponse .to each impulse, line relay200 will bel momentarily deenergized. Upon each deenergization, a circuit willbe closed from grounded battery, winding of primary stepping magnet 205, contact 206, front contact and armature of relay 2011, back contact and armature of relay 200 to ground. Thelirst deenergization of line relay 200 and the con-v sequent st'epping of the switch by the operation of magnet 205, will close the off-normal contact 216 and thus provide a shunt for the resistance 201, which will permit energization of relay 200, since only the resistance 180 is now included inthe line circuit, while the sending device C is `operated. A circuit is also completed for slowto-release relay 207 extending from grounded battery, winding of relay 207, front'contact and armature of relay 204, back contact and armature ofrelay 200 to ground. Energization of relay 207 completes a'circuit from grounded battery, winding of escape magnet 208, side-switch wiper 209 in position 1, armature and front contact of vrelay 207 to ground. Relays 204 and 207 being slow to release, will maintain their armatures attracted during the transmission of impulses to relay 200. At the termination of the first series of impulses, relay 200 lremains energized for a suliicient length of time to permit deenergization of relay 207 and upon its release, escape magnet 208 will deenergize andv move the side-switch wipers into position 2. In this position, a circuit will be closed for secondary `stepping magnet 210 extending from grounded battery, winding of' said magnet, armature and back contact thereof, side-switch wiper 211 in position 2, front contact andarmature ofrelay 200 to ground. klt/iagnet 210, being self-interrupting, will'step brushes 212, 213 and 214@ over the terminals ofthe selected group until an idle trunkleading to the connector switch E is found, the idle condition of this switch being denoted by a ground upon the test terminal 215.l As

soon as brush 212 engages terminal 215, a circuit will be closed for escape magnet 208 extending from grounded battery, winding of said magnet, side-switch wiper 209 in position 2, brush 212, terminal 215, left armature and back contact of relay 300 of the connector switch, back contact and right armature of slow-to-releaserelay 301, back contact and armature of linerelay SO2-to ground. Escape magnet 208 energizespand nieves the side-switch wipers of the selector switch D into position 3.

it the subscriber at substation A'sliould operate his sending device previous to the seizure of the trunk leading to connector switch E, contacts 103 will again be opened and resistance 130 included inthe line circuit. Upon movement of the side-switch winding of said relay, front contact and vseries with resistance 130 and said line relay will fail'to energize, with the result that the secondsetof impulses intended to step the connector switch. ,will bel lost and saidswitch will remain in its-normal position. r f.-

ssuming that the operator at substation A did not: operate his sending `device before the trunk leading to connector switch E wasy seized, the movement ofV side-switch wipers 202 and203 into position y3 will extend the line to said connector-switch. A circuit is then` completed "from grounded battery, `right winding of line relay 802,

lower side ofthe telephone line, substation apparatus A, 1 conductor '102,-' contactsy '103,

conductor 1041, upper side of the telephoney line, resistance 430S and left winding of relay 302 to ground. Energization of relay 302 closes a circuit `for slowto-release relay eXtending from grounded battery,

armature of relay 302to ground.' The con- -nector switch is now in condition to receive:

the 'second' series o'f impulses. After the dial of sending device C has beeninitially adjusted but ybefore the first impulse isA trasmitted, resistances 130 and 303 are in series, but relay 302 is adjusted so that the same will not release when 'this condition exists. A i

In response toeach impulse of this series,`

linerelay 302 is momentarily deenergized and thereby completes la circuit for primary stepping magnet 30-14 extending from grounded battery, winding of said magnet,

side-switch wiper 305 in position 1, front contact and right armature of relay 301, back contact and armature of relay 302 to ground. A circuit is also completed for 'slow-to-releas'e relay 306 extending from grounded battery, winding of said relay,v

front contact and right armature of relay 301, back contact and armature of relay 302 to ground. Relays 301 and 306 being'slowto-release,`w`ill be maintained energized durv ing the transmission of the set ofiinpulses.

Energization of relay 306 establishes a lcircuit'eXtending-from grounded battery, front contact yand right varmature of relay 306,

winding of escape magnet 307, back contact and armature `of marginal relay 308 to ground. Upon the lirststep of theconnector switch, olf-'normal contacts 309 `and 310 will close and the latter contact will vshunt thek resistance 303 so that the same will not bein series withthe'resistance 130 at sub` termination of the impulses, line relay 302 stepping will remain energized, thereby causing 4the deenergization of slow-.to-release relay 306. Release of relay 306 will open the circuit for escape magnet 307, which, upon releasing, will move the side-switch wipers of the connector switch intoposition 2'. y

The third set of impulses will again vibrate the armature of line relay 302 and cause energization of relays 301 and 306 and escape. magnet 307, as previously described. A circuit is also closedfor the secondary` magnet 311 extending from grounded battery, winding of magnet 311, side-switch wiper 305l i-n position`2, front contact and right armature oi? relay 301, back- Contact and armature of relay 302 to ground. Secondarymagnet 311 operates to step the brushes 312, 313 and 314 on to the terminals 315, 316 and 317 individual to the telephoneline associated with the called substation F.4 Should the called line be busy, aground will be found upon test terminal 315. It thisline. is busy as a calledl line, this ground will be connected through sideswitch wiper` 318 in position 4 and` brush 312 of some other connecting switch, or if busy as a calling line, ground will be connected throughthe left armature and back contactotI release magnet 113, make-beforebreak contact 126, contactspring 125, and brush 119- of a line iinder B connected thereto. Therefore, when relayI 306 deenergi'zes after the third series of impulses, a circuit will be completed for release magnet 321, whichv maybe traced' from groundedl battery,v right winding of release magnet 321,

4right armature and back contact of relay 300, off-normal contact 309, left armature and back contacty of relay 306, side-switch wiper 318, brush 312 and lterminal 315l to ground.- Release magnet 321 establishes a holding circuit for itself extending from grounded battery, winding of release `magnet 217, off-normal contact 218 which was' closed upon the iirst step of the selector v switch D, side-switch wiper 219 in position 3, brush 212, terminal 215, left armature and front contact of relay 301 liront contact and f lett armature of magnet 321 and left winding oi' said magnet to ground. Since escape magnet307l is made slow to release, the circircuit for release magnet 321 energizes release. magnet 217 0f Selector switch D`r and causes this switch to return to normal, at which time the 05E-normal contact 218 will be opened. Acircuit is alsoy established in parallel with magnet21'7 extending from grounded battery, winding of release magnet 113 of line finder B, off-normal contacts 131, armature and back contact of relay 107, `side-'switch wiper 219 in position 3, brush 212, terminal 215, left armature and front contactofI relay 301, frontlconta'ct and left armature of release magnet 321, and left winding of said magnet to ground. Energization of the. release magnet 1131 returns the` line finder switch D to normal position in a manner well' known in the art. li the called line Vleading to substation F had been idle. at lthe tiinef the brush 312 engaged terminal- 3-15, no ground would have been found on said terminal so that deenergi'zation off relay 306 would haved caused the release oit-'escape magnet 307 and the sideswitch wipers of the connector switch would have been moved into position 3.

In position 3, a circuit is completed from grounded battery, winding of' relay 3.06,

side-switch. wiper 305, in position 3, front contactand armature of relay 302 to ground.

Rela v 306 enero'izes and again establishes y b a the energizing circuit for escape magnet 307,

which in attracting its armature,'completes a circuit from a ringing generator (not shown), front contact and armature of escape magnet- 307, winding of marginal relay 308, side-switch wiper 319 Vin position 3, brushv 313, terminali 316', apparatus at. sublOO station F, terminal 317, brushl 314, sideswitch wiper 320 inposition 3, front contact and armature of relay 302 to ground.

The current flowing through this circuit is not suiiicient to `operate marginal relay'308 at this Jtime, but as soon as the subscriber at substation F removes his receiver kfrom its switchhook, thereby shuntingtlie ringer at this substation, suiiicicnt 'current flows throughy the marginal relay 308` to cause itf to attractits varmature and open the circuit of escape magnet 307. This escape magnet deenergizes and. moves the" side-switch wipers into position 4.

A. connect-ion'has nowbeen established between substations A. and F, and talking current is; supplied; to thecalled .subscribers line from grounded battery', le'lt windingv oit relay- 300, side-,switch wiper 319, brush 313, terminal 316, substation apparatus F, terminal 317,v brush 3'14, side switch wiper 320 and right winding of relay300 to ground'.

At the termination of conversa-tion the subscribers at substations A and F will, by replacing their receivers, deenergize line re` lays 300 and 302.y VRelease. ofV relay 302 causes in turn'the deenergization of slow-torelease relay 301. Ground is then` connected toV theV release conductor 323 through the varmature. and back Contact. of relay 302,

CII

right armature and baclr contacto't relay 301, back contact and left armature ot relay 30G. 'Circuits :tor release magnets i123, 217 and 321 are then completed over the conductor 323 and the respective switches associated with these release magnets will be returned to normal, as previously referred to.

V7 hat is claimed is:

l. lln an automatic telephone exchange system, a calling subscribers line, an impulse sending device thereat, means tor eX- tending said calling subscribers line, a switch for connecting said calling subscribers line with the last named means and resistances at said sending device and said eX- tending means operable to prevent actuation of the latter it said extending means is connected to the sending device while said sending device is operating.

2. ln an automatic telephone exchange system, a calling subscribers line, an impulse sending device thereat, means for extending said calling subscribers line, a switch for connecting said calling subscribers line with the last named means, variably adjustable means for operating said sending device to control the operation of said er:- tending means and resistances at said sending device and said extending means operaable to prevent actuation of the latter it said extending means is connected to the sending device while said sending device is operating.

3. ln a telephone system, a telephone line, asender therefor, a numerical switch, means :for automatically extending saidline to said switch upon the initiation ot a call therein, and means for preventing said numerical switch from responding to the first set ot impulses from said sender, said means being rendered effective only in case said numerical switch is connected to the sender while the sender is operating.

4l. ln a telephone system, a telephone line,

-a dial therefor, a numerical switch, means for automatically extending said line to said switch upon the initiation ot a call therein, and means r'for preventing said numerical switch from responding to the first set of impulses from said dial, said means being rendered eltective only in case said numerical switch is connected to said dial while the dial is operating.

5. ln a telephone system, a telephone line, a sender therefor, a numerical switch, a progressively movable non-numerical switch for automatically extending said line to said numerical switch upon the initiation of a call in said line, and means 'for preventing said numerical switch from responding to the first set of impulses from said sender,

said means being rendered effective only in case said numerical switch is connemed to said sender while the sender is operating.

6. ln a telephone system, a subscribers line, a dial thereat, a selector, an automatic iinder switch for extending said line to said selector upon the initiation ot a call, and means rendered effective in case the selector is connected to the dial while the dial is oft".- normal :tor preventing the corresponding set of impulses from affecting the selector.

7. ln a telephone system, a telephone line, a selector, groups of trunks terminating in numerical switches, a sender associated with said line, said selector being controlled by the initial set of impulses transmitted by said sender to select a grounp of trunks, means for causing said selector to select an idle trunk in said selected group, and means 'for preventing the numerical switch in which said idle trunk terminates from responding to the succeeding set ot impulses, said means being rendered eective in case said telephone line is extended to the said numerical switch while said sender is operating.

8. ln an automatic telephone exchange system, a calling subscribers line, an impulse sending device, a selector switch, for extending said line, an impulse relay for said selector switch, a switch tor interconnecting said calling subscribers line with said selector switch and resistances operable to prevent actuation of said relay in response to the first set of impulses from said sending device, said resistances being rendered effective only in case said selector switch is connected to said sending device while the Sending device is operating.

9. In an automatic telephone exchange system, a calling subscrihers line, a sending device, a selector switch for extending said line, an impulse relay for said selector switch, a switch for interconnecting said calling subscribers line with said selector switch, variable adjustable means for operating said sending device to control the op- -eration of said selector switch and resist-l ances associated with said sending device and said selector switch to prevent actua tion of said relay in response to the first set ot impulses from said sending device7 said resistance being rendered effective only in case said selector switch is connected to said sending device while the sending device is operating. n

ln witness whereof, we hereunto suhscribe our names this 12th day of December a. D., 1918. i

HENRY r. cnausniv.

oiiannns L. GooDnUa/r.

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