US1468249A - Automatic telephone system - Google Patents

Description

Sept. 18, 1923. 1,468,249

w. T. POWELL AUTOMATIC TELEPHONE SYSTEM Filed 1919.

2 Shee Fle l INTERRUPTER.

FINDER.

CONTACT X CLOSES BEFORE ASEOCI TED CONTACTS BREAK.

NOTES TO Got-(HECTOR- A LLOTTER INVENTOR WINFRED T. POWELL.

BY 11 W ATTORNEY Sept. 18,1923. 1,468,249

w. T. POWELL AUT OMATI C TELEPHONE SYSTEM Fil ed Oct. 25, 1919 2 Sheets-Sheet 2 CONNECTOR SWITCH CONTROL LER SWITCH INVENTOR WlHFRED T POWELL.

BY A? cz lz m ATTORNEY ture and back contact of the cutoff relay 7 y to ground; The relays and LR are energized in this circuit, and the relay 5 through its armature and frontcontact closes conductor 6. leading to;' a; tone device which will apply atoneto the calling line until this line has been connected to an idle trunk.

This tone therefore indicates to the "subscriber that'he should not operate his dial sender until thetone ceases, otherwise some of the directive impulses will be lost and a magnet, and allotter brush 1O to'ground.

Under the control of this circuit the motor magnet 9 advances the brushes of the finder switch until the test brush 11 encounters test terminal 12 of the calling line which I hasbeen grounded by the energization of the line relay LR. When this occurs, a circuit is closed from grounded battery, resistance, outer armature and front contact of relay 5, allotter brush 7, lower winding of relay 8 to ground over test brush 11. It

calling line to the selected idle trunk.

will be noted that this last described circuit shunts the'motor' magnet 9 of the finder switch to stop the same, and also energizes the switching relay 8 which connects the As soon as the switchingrelay 8 has completed its operation, the stepping relay SR station circuits inseries.

of the connector is energized over the trunk conductors 13 and14 andthe line'and'sub- Under the control of this circuit, stepping relay SR operates its armatures and in turn causesthe energization of relay 34 The motor, magnet 15 ofthe controller is thereupon energized in a circuit traceable from grounded battery,

winding of the motormagnet 15, conductor 16, outerarmature and front contact of the stepping relay SR, left hand back contact and armature of relay 17 to ground. .The

. motor magnet 15 is energized in this circuit and attracts its armature to complete an operating circuit forthe relay 17 extending from grounded battery, resistance, winding of the relay 17, its continuity spring 18 and contact,'right hand front contact and arinature of the motor magnet15, conductor 19, brush 20 of the controller in its home position, lowermost armature and back contact of switching relay 21 to ground. The relay 17 which remains energized until the time of release when it deenergizes to permit the controller switch to move to its home position, is operated and attracts its armatures, At its continuity spring 18 and 7 armature, itf closes 'a locking circuit for itself to ground. At theouterlefthand'armature and back contact of relay 17, the energizing circuit of the motor mag-net.15 of the con j troller isinterrupted, 'causing the controller to moveinto its next position which hasbeen designated a normal position.

left handarmature and front contact of is- ..As soon as-therelay 17 attracts its armatures, a clrcultisclosed from ground, outer V lay 17,'conductor 30, holding brush 31 or,

the finder switch, winding'of the cut-oftre i This circuit;

lay CO to grounded battery.

also places a guarding potential on the testterminal of the calling line at the connector to prevent its seizure i as a called line.- The cut-off relay operating'disconnects the line relay and also the 'dial tone previously men'- tioned. At the right hand armature and continuity spring 18 of the relay 17 ground isapplied to conductori32, upper winding. of the switching relay 8 'to grounded battery to hold this relay energized after the allotter has broken itsoriginal energizing winding.

As soon asthe controller brush 22 leaves its honie position, the energizing circuit of the relay 23which isenergized as" long as the allotter brushes are standing in a'po-' sitiontoassign an idle trunk, releases. The

energizing circuit of'therelay 23 extends from ground, winding of this'relay, allotter brush 24:, conductor 25,-controller' brush 22 inits horne position, conductor 26, outer armature and back contact of relay 17, arma ture and back contact of' the motor magnet 15, conductor 27, winding of the motor magnet 15 to grounded battery.

When the relay 231deenerg1zes, it closes a circuit for a relay 28'which'co-opera-tes in the control ofthe motor magnet 29 of the the allotter will advance its 'brushes slowly enough so that it willhavean opportunity] to test for idletrunks. The relay 28 is en-f ergized over a circuit controlledat the back contact and armature of theimagnet 29and' at the back contact and armature of relay 23. The relay 28 attracts its armature to 1 close an operating circuit for the motor magnet 29 of theallotter, so that this magrelay 28 causing the relay 28 aspen theoperating circuit of the motor magnet; 29;

operation between the relay'28 and the magnet 29 with the result that the allotter operates slowly enough to insure accuracy" in testing. Under the control of thecircuits just described, the moton magnet 29 ad It will thus be seen that there is an intervances the brushes of the allotter untilthef allotter brush 24 engages a test terminal on I which there is battery potential applied over a. circuit similar tothat described as including the controller brush 22 in its 105 allotter switch. This relay 28 insures that net will advance the brushes of the switch one step. It also opens the circuit of the home lposition. When such aitest terminal is reached, the relay-23 will be energized to open'the circuit of the controlling relay 28 and relay 23will remain operated until the:

newly assigned trunk is taken for use. The apparatus is now in condition to receive the impulses from the dial senderat the substation A; Since only av connector switch has'be'en shown, it is necessary'to transmit a tens'series of impulses to advance thereon nector switch-to a desired'group of lines at the close of this series of impulses.

and thereafter directly operate. the switchto select a wanted line in the'selectedgroup, In accordance V with the present vinvention the connector is arranged so that it neednot be advanced anumber of steps equal to the number of impulses transmitted from. the dial sender, but assumes a: setting under oer tain conditions predetermined by the controller which in the case of the tens seriesof impulses acts as a translating device.

' lt-will'first be assumed that the wanted line is inthe first groupof lines terminat= ing in the connector switch under which as sumption one impulse of current will be transmitted by the. dial sender to cause the connector switch to take a setting in operative relation to the first'group of lines termiating at thefswitch. It will then be as sumed that the, wanted line is in the second groupaof lines terminating at the connector under which condition it-willbe necessary to transmit five impulses, and lastly it will he assumed that the wanted line is in a third group of lines at the connector switch.

and" the change-over relay 40. Brushes and 36 areclosed inpredetermined intervals and-the circuit is completed through brush whenever the circuit is closed through brush 35. In the case of the change-over operation it is necessary that the controller remain in one position during a series of impulses," but to advance out'of this position It thereforebecomes necessaryto measure an intervaloftime greater than that between two impulses of a series, in which interval the' control switch must not. be advanced, but when .a period longer thanrthis interval transpires the circuit must be'closed to ad- Vance the controller to asucceeding position. It will appear further in, the description that during t-he receipt of a series of imnulses' lhc circuit will be; intermittently closed through the right-hand winding ofthe changeover relay 4 0', and alocking circuit i through the right-hand winding of this, re.-'

lay is intermittently closed atthe brush 35, v

so that itimay happen during-the period of receivi'ngthe series ofimpulses that the frelays 4:0 will haveitsarmaturkes retracted which is one of-th'e conditions necessaryto cflect the change-over, -but at this time the circuit willbe open at brush" 36. In order to' effect the change-over the circuit must be? opened through the right-hand windin-g of the change-over relay and anj -interval ot' time must ha'velapsed sufficient toopen the T i i circuit throughlbrush 35 before-the circuit controlling the change over extending through brush 36and theright-hand armature and back contact of relay a0.- is efiec'tive.

similar time interval is measured for, con-i trolling the releaseoperation and this like-i wise will appear from the following description; V r r r 7 v Sinceit hasibeen assumed that the wanted line is in thefir'st groupoflinesterminat transmit one impulse corresponding tothe first digit of the wanted imember. The step ping relay SR will retract-its armatureonce and-then remain: energized until the units .Ihis will'appear; from the furtherdescription of OPGIYHIIOILOfthG connector switch. A V 851 Y series of impulses." When the stepping relay SR=retracts its armature, it opens the" energizing circuit of the restoring relay 34; This relay will be locked energizedthrough its: left hand winding if interrupter brush 9" is connected to ground; Ii, however, the interrupter brush '35 is not closed" to ground,

the restoring relay will close a break point in the restoring circuit atits armature and back -contact,- but before-interrupter brush 36 is closed 'togroundto comp'lete this cir cuit after groundhas been removed at interrupter 35, the stepping-relay SR will attract its armatures to 'energize relay 34 again. Therefore the restoring circuit for the connector switch controlled at the'b'ack contact andarmature of th'e restoring relay the stepping relay SR retracts its armatu'res inf-response to an impulse :correspond- 34 is ineffective as long asthe calling party 7 has his receiver fro-mats switchhook; When w ing' to the-tens digit of the wanted number,

the'motor magnet- 15 ofthe controller is en-f er'gized in l a circuit completed 7 from grounded battery winding of this magnet,- conductor 27; armature and back contact ofthe motor magnet, the right hand winding of relay- 37, conductor 38, the controller brush 22 in its normal position, conductor 26; armature "39 and; back contact of'relay 37, right handwinding of relay lO,-' iriner right hand, tron-t contact and armature of relay 17,1-innerback contactand armature F of stepping relay SR to' ground;' Themotor magnet 15.1an1d the. relays 40 and '3Zv'are on 90: ing at'thescon'nector, the subscriberwill then 'ergized for a relatively long interval after crgized in this circuit. Relay 37 locksitself energized through its left hand winding, front contact and armature. The right hand winding of this relay is opened at this time at its outer right. hand contact and arma-;

ture 39. Relay has a locking circuit intermittently closed throughits left hand winding, front'contact and armature tointerrupter brush 35. f vllhen the stepping relay SR is energized at the close otthis impulse, it will interrupt theoperating circuit oi the motor magnet 15-p'reviously descr bed,

causing this magnet to' deenergize arijdadvance the controller brushes to positionone. 'lhe change-over relay lO will remain. en-

the transmission of the'tensim'pulse or impulses,:so that the interrupter brush 36 will have an opportunity to extend. ground to the inner right hand armature and front contact of relay37 to short circuit thisr'elay and cause itsdeenergization. Y

The calling subscriber may now operate his dial sender to transmitimpulses corresponding to the units digit ofthe wanted number. In response to each impulse transmitted, the stepping relay SR will vibrate its armatures.- vIn response to the first impulse of the units series, the motor magnet of the controller will be operated to advance the controller. to position 2 over a circuit closedfrom: grounded battery, winding of this magnet, conductor 27, outermost right hand front, contactcand armature of relay 1?, conductor 11, uppermost back contact and armature of relay" 21, controllerbrush 12 in positionone, conductor 43, right hand winding of relay 1a, conductor 45, brush 22 in position 1, conductor 26, armature 39 and back contact of relay 37, right hand wind ing of the changer-over relay 40, innermost right hand front contact and armature of relay 17,'inner back 001115210 3 andarmature of the steppingzrelay' SR to ground. The motor magnet 46 of the connector is also energized at this time in a circuit extending from grounded battery, winding of thermotor magnet, conductor 4&7" and in multiple with the circuit previously described, over position one. Thereafter each time that the stepping relay SR retracts its armature, it closes a circuit from ground, ts inner right hand armature and 'bacl; contact, in-

nermost righthand armatureand front con- Y tact 0t relay :17, right hand windingfof relay 40, armature 39 and'backcontactof reg; v lay 37, conductor 26, brush 22 of the con r troller in its secondposition, conductor e7,

. winding of the motor magnet Q6 of thecon nector to grounded battery, 7 in response to 7 each of theremaining impulses transmitted tothestepping relay the motor magnet 16p the connector'advances the connector.

brushes progressively;

It will inowbe assumed the wanted line is in gthe second group of lines at the connector switch. It w ll therefore be necessary for the calling subscriber .to operate] his dialse'nderto transmit a ,tens series-of It will be remembered thecasecwhere a single tens impulserwas transmitted that.

the motor magnet 15 caused the controller a brushes to move to position one, andthatthe relay 37 was locked energized until. the

change-over was efi 'ected. at the close of the tens seriesot impulses. v In the present instance when the. subscriber transmitsffive' impulses for the tens digit, the motor mags net 15 of the controller will move the brushes of this switch one step for eachim- 7 pulse received, and when the controller reaches position two, a circuit is closed for themoto-r magnet 16 of the connector, conductor 17 and over conductor 4:3 in multi ple with the operating circuit of the motor' magnet 15 of the controller. Inresponse to the second, third,and fourth impulses from the substation dial sender, the controller will be advancedthrough positions two, three and four. The controller will be advanced slowly through these positions,

since its operation is controlled at the dial sender and while it is being thus advanced, acircuit will be closed for. a suff cient interval of time to advance the connector brushes to the last line of the first group of lines terminating at the connector. I This circuit for advancing the connector to the last position I of the first group of lines extends ,from grounded battery, windingof theimotor magnet 46, connector brush 50 in its positions one to six inelusive,rconductors 51 and 52, controller brush 53 in its positions two, three and four, conductor 69, upper middle armature and back contact of relay 21, con-I ductor 54, left hand front contact and arma-- ture of relay 37 to ground. At the close of the tens series of impulses, the relay 37 will be short .circuited as in the case previously described, and the impulses of the second or units digit will be recorded directly on the connector to advance this switch to" the wanted line in the selected group.

If the wanted line is in the thirdgrou of lines terminating at the connecto'n-the rst or tens digit of the wantednumber will be 9. The operations previously described in connection. withthe selection of the first and second groupsof lines at the connector will take place, and while the controller is being. advanced through positions six, seven 7 group, the designation of which is 9. If the called line is idle when the test is made,

- there will be no ground potential on the test terminal of the wanted line with which the test brush of the connector is in engage inent.

Since the controller at t'he time of testing the wanted lineremains in the position to which it has been advanced during the tens series of impulses andthe change-over at the conclusion of this series of impulses; the

controller willbe standing in positions'two,

six or ten depending upon whether the tens digit was one, five or nine. At the time of the change-over the relay 44 is short circuited by ground at interrupter'brush 36 and deenergizes to close a circuit from ground,': resistance, brush 36 of the interrupter, armature and back contact of relay 40, inner right hand armature and back contact of relay 37, right hand back contact and armature of relay 44, conductor 78, innermost upper back contact and armature of relay 21, conductor 56, armature and back contact of relay 57, conductor 58,brush 42 in positions two, six' or ten, conductor 72, uppermost armature and back contact of relay 21,

conductor 41, armature and front contact of relay 17 conductor 27, Winding of the motor magnet 15 of the controller to grounded battery. Under the control of this circuit the motor magnet advances the controller brushes one step, moving them to positions three, seven or eleven depending upon the position of; the brushes duringflthe'testing 'of the wanted line.

The relay 21 is energized in a circuit extending from ground, resistance, interrupter brush 36, right hand armatures and back contacts of relays 40, 37 and 44, conductor 78, innermost upper back contact and armature of relay 21, conductor 56', armatureand back contact of relay 57.

conductors 58 and 59, upper winding of relay 21, conductor 60,-controller brush 42 in positions three, seven or eleven, upper armature and back contact of relay 21 to grounded battery over conductor 41 and motor magnet '15. The-relay 21 is operated in this circuitand closes alocking circuit for itself throughits lower winding, innermost lower front contact and armature which close before associated contacts on this: relay break, conductor 61 outer left hand front contact and armature of relay 7 17 "to ground. "Relay 21 connects' a guard-7 ing potential to thetest brush'55 to make the test terminal of'the called line busy and to operate the cut off relay of the'c alled line herein shown as a resistance designated 62. The relay 21 closes a circuit to move the controller switch -past' positions three, four, seven, eight, eleven and twelve, if this switchhas'not already bcenadvanced past these positions. This circuit is traceable from grounded battery, Winding of the'motor magnet 15 of'the controller, conductor 27 back contact and a'imature'of motor magnet 15, conductor 63, lowermost front contact and armature of relay 21, brush 20 of the'controller in positions three, four, seven, eight, eleven and twelve, conductor 64, continuity spring 65 and middle lower armature o'f relay'2l to ground; The relay 21also closes a circuit to advance thecontroller switch past positions five, sixpnine andten depending upon which position the controller 'was standing at the close of the testing operation. The-l'ast named circuit is completed from grounded battery, winding of the motor magnet 15 of the controller, conductor 27, back contact and armature of this magnet, conductor 63,

lowermost front contact and armature of thirteen and the called subscriber 'will be signaled over a circnitcompleted from the ringing machine 67, trip relay 68, controller brush 53 in its thirteenth position," trunk conductor "69, middle upper armature "and front contact ofrelay 21, connector brush,

70, through the lower side of the called line and bell at the called station, upper side of the called'line, connector brush '71, uppermost front contact and armature of relay 21,

trunk conductor 7 2, controllerbrush 42 in its thirteenth position to ground; The slow releasing trip relay 68 is marginal and does not operate in this circuit until the called partyresponds. It will thereupon receive 7 sufficient current to energize and: attract its c 1 i armature to, close a c rcu t from'ground, its

armature and'front contact, controller brush 20 in its thirteenth position, lowermost armature and front contact of relay 21, conductor 63, armatureand back contact of the motor magnetlfi'of the controllen conductor 27 winding'of this magnet to grounded battery'u The no tor magnet 15 interrupts its own circuit to advance the brushes of thecontroller into their fourteenth or talking position;-

Talking battery for the calling partyv supplied through the windlng of the step ping relay SR, while the. talking battery tor thecalled subscriber is suppliedthrough the winding of the relay 57.

- In the event that the called line is busy when tested, the test brush of the connector will encounter a ground potential on the test terminal of this line; This will cause the operation of the relay 57 of Fig. 1, over a circuit'closed from grounded battery, left hand winding of relay 57, continuity spring 73 and outer left hand armature of relay 44,

- conductor 74, test brush 55 to ground at the connector switch which has previously seized the'wantedline. When the changeover takesplace at the close of theltens series of impulses, interrupter brush 36 closes a circuit from ground through the right hand armature and back contact of relay 40, inner right hand armatureand front contact of relay44 which shunts the relay 44 and *back contact of relay 21 to ground.

Thebusy tone is now transmitted to the calling party to inform him that the wanted line is, engaged. This tone is sent over a circuittraceable from ground, winding of the transformer, brush 36 of the interrupter, right hand armature andback contact of relay 40, inner right hand armature and back contact of relay 37, outer armature and back contact of relay 44, conductor 78, innermost upper back contact and'armature of relay 21,- conductor56, outer armature and front contact of relay 57 over the upper side of the trunk, and calling line andsubstation circuits,-over the lower side otthe line and trunk circuits, continuity spring73 and back contact of relay 44, inner armature and front contact of relay 57, conductor 75, back contact and continuity spring of relay 21,

. controller brush 20 in positions two, six or ten, lowermost armature and back contact of relay 21 to ground. The testing operation justdescribed takes place in the samemanner irrespective of whether the controller is standing in positions two, six or ten, since the same circuits are established at each of these points in multiple. V I

If the calling party should again operate :his dial sender after receiving the busy indi- .cation, the connector switch will be advanced but the controller will remain in its testing position, that is, in positions two, six or ten so that no disturbance will result from this last mentioned operation.

this relay to retract its armatures.

sition fourteen.

When thecalling' party replaces his re,- ceiver on theswitchhookeither because he has terminated his conversation or desires to abandon the call, the stepping relay SR will. have its energizing circuit opened and will retract its armatures. This will open the energizing circuit of the right hand Winding of relay 34, and when interrupter brush 35' disengages its contact, the left hand winding of relay34 will be deenergized permitting In the course of the operation of the interrupter,

ground will be applied over brush 36, armature and back contact of relay 34, inner left hand front contact and armature of relay j 17, resistance, to grounded battery. This circuit shunts the relay 17, causing it to deenergize and retract its armatures. At theouter left hand armature andffrontcontact.

of this relay the locking circuit of relay 21 including conductor 61 iso-pened,causing this last named relay to retract its armatures. Also at this same armature and front 7 contact of relay 17 a" holding circuit for the cut-0H relay. including conductor 30 is opened, removing the guarding potential from the called terminal of the calling line at the connector, and also causes'its cut-off i relay to reconnect the line relay to the line.

.At' the middle armature .and continuity spring 18 ofrelay 17, the holding circuit for therelay 8 including conductor 32 is opened to disconnect the line brushes of the finder from the trunk, After the, release of relays 17 and 21", the controller is advanced to po- 7 Ground is connected through the lowermostarma-ture and back contact of relay 21 to the controller brush 20, and when this brush is standing in positions one, two, five, six, nine andten, it will close a circuit over conductor 80, back con t acts and armature 81 of relay 17, armatureand back contact of motormagnet 15 of the cont-roller, conductor 27, winding of i i this magnet to'grounded battery. Under the control of/[his circuit the controller will be advanced through the last named positions. l The controller is also advanced pastposi tionsthree, 'four, seven, eight, eleven and twelve over a circuit closed from ground at the back contact of the stepping relay SR, innermost right hand armature and back contact of relay l7,, conductors 82 and 83,

brush 22 of the controller inpositions three,

four, seven, eight, eleven and twelve, con-' ductor 26, armature 81 and back contactof relay 17, back contact and armature of the motor magnet 15 of the controller, conductor I 27 winding of this magnet to grounded bat tery. Whenthe brush 22 of the controller is standing in its thirteenth posit-ion, ground is applied over conductor 26, and the armature 81 and contact. of relay 17, armature and back contact ofmotor. magnet 15, con ductor 27, winding of magnet 15 to ground-' ed battery to advance the controllerto position fourteen.

The connector is advanced. past points '1 to 6 inclusive, by a circuittraceablc from ground, outer left hand armature and back contact of relay l7,' outer armature and back contact of'the stepping relay SR. conductors 85 and 51, brush in positions 1 to 6 inclusive, back 2 contact, armature magnet 46 to grounded battery, The connector is advanced past positions 15 to 25 by an operating circuit closed from grounded battery, winding, armature an'dba'ek contact of this magnet 46,'connector brush 5 0 in positions 15to 25 inclusive, conductor 86, controller brush 20 in position fourteen,;lowermost'armature I and back contact of relay' 21 to ground. The connectorhas now been advanced to its home posltionand a oncuit 'is thereupon completed from ground,

through connector brush71, conductor 87 controllerbrush 22 in its fourteenth position, conductor 26, armature '81 of 'relay"17, armature and back contact of'tlie motor magnet 15 of the controller,conductor 27, winding of this motor magnet-to grounded battery. Under the control of this circuit,

7 the controller advances its brushes to their so-called home position.

It will thus be seen that a controller or sequence controlling device has been 'provided which also functionsasa register and translating device andwhich "stores a portion of the wanted number, and thereupon causes its associated connector switch to be adjusted to a positioncorrespondingto the number as translated by said device. 4

What I claim is: i I

1. In a telephone system, an incoming line. a plurality of outgoingljines, an automatic switch for interconnecting said incoming line with any of said 'outgoing lines, and a progressively movable" registering switch individual to said automatic switch and operated directively from a distant point to cause said automatic swi'teh to take a desired setting other'than thatindicated by said means. Q

2. In a telephone system,fan "incoming line, a plurality of outgoing linesyan automatic switch for interconnecting said incoming line with any of said OUtQUlIIQllHGS,

and. a progressively movable translating de- 7 vice individual to said automaticswitch and operated directive-1y from i a distant point to cause said automatic switch -to'take a: desired setting other than; that indicatedby said translating'device'i 1 3.'In *aitelephone system, an incoming line, a plurality of outgoing lines, an automatic switch forinterconnecting said in- :oming line with any of said-outgoing lines, and a progressively movable combined sequence controlling device and translating mechanism individual to said automatic switch and operated'directively froma dis tant point to cause saidswitch to take a desired setting other than that indicated by saidcontrolling deviee and translating mechanism. "m n 1 4. In a"'telephon e system, an incoming line, 'a variably "adjustable impulse sender associated with said 11118,: a" plurality-of i outgoing lines, an automatic switch for in! terconnecting said incoming line with. any;

of said outgoing lines, andaprogressively movable translating switch' i'ndividualto' fsaid automatic switch and directively con-- trolled over 'saidincoming line to take a settlng in accordance with the ad ustment of said impulse sender, saidautomatic switch during a portion of-its operation being controlled by said translating means to take a desired setting otherthan thatins dicated by said impulse sender.

line, a variable adjustable impulse sender associated with said line. -a plurality ofoutgoing lines, an automatic switch for interconnecting said incoming line with any of said outgoing lines, a progressivelv movable translating'switch individual to said-switch 5. Ina telephone system, an incoming and *directively controlled iovernsaid-"iin coming-line to take'a setting inlaccordance with the adjustment of saidimpulse sender, said automatic switch during a "portion of its operation being controlled by said translating means to take a desired setting other than that indicated. by said impulse sender, and during the remainder of its movement set in accordance with the ad-;

justment of said impulse'sender, i I -6. In a telephone system, an incoming line, a plurality of outgoing lines arranged. in groups, an'automatic switch operable through group and line selecting movements to interconnect said incomingflin'e with any of said outgoing lines, and a progressively movable translating device individual to said switchv and directively controlled hover saidincoming' line to cause said switch :to select a group of outgoing linesiother than that indicated bythes'etti-ng ofs'aidtranslating device, said automatic switch being.

line, a -plurality o't outgoing'lines arranged 'directivelv controlled during 'its' .line sel'ectin "groups, automatic switch. operatineff 130 through line andlgroupselecting movements system, an incoming vice, said automatic switch beingdirectively controlled during its line selecting movement. I p

8. In a telephone system, an incoming line, a plurality of outgoing lines, an automatic switch for interconnecting said incoming line with any of'saidoutgoing lines, a progressively movable controlling switch individual to said automaticswitch and operating circuits in multiple-for said'switches directively' controlled over said incoming line.

r 9 In a'telephone system,itelephone lines, trunks for interconnecting said telephone lines terminating in numerical switches, a finder switch'operating on the initiation of a call over any of said telephone lines to connect its trunkline to the calling line, controller switch .for maintaining said trunk normallyopen at points between its finder and numerical switch 'and' means controlled over said incoming line for directively operatin said controller switch to 'overn the setting of said numerical switch.

' 10. Ina telephone exchange system, a selector switch having fixed terminals and moving contacts co-operating therewith, groups of lines connected to said terminals, other terminals being allotted for group solection, lines'of said groups and said group selection terminals being interspersed in order of their appearance and means including a lmechanical timing device associated with said selector switch for moving said contacts over said terminals to select an idle line. r 7

11. In a telephone exchange system a selector switch having a terminal bank, groups ofsubscribers lines connected to certain terminals of said bank, other terminals being allotted for group selection, directively {controlled means for moving the switch over certain of said terminals and terminals of one of said groups, said means including a rotating timing device associated with said selector switch and means for automatically moving said switch over terminals in another group to select another group for a line selecting operation therein. v 12. In a telephone exchange system, a selector switch having a terminal bank, groups of subscribers lines connected to certain terminals of said banks, other'terminals being allotted for g'roupselection, directively con trolled means for selecting one of said other terminals, said meansincluding a mechanicaltiming device associated with said sefor selecting a group decimally and auto-- matically, and means for thenselecting a line decimally, certain of said means includ ing a mechanical timing device associated with said selector switch.

14. In a telephone exchange system, a

switch havin a movement in a sin le )lane, D 23 v a wiper for said switch, groups of subscribers lines terminating in, said switch, said subscribers lines being decimally designated and means. responsive to a number of impulses to step said wiper toselect a group of lines and a line in said group, the steps ofsaid wiper. in its group andline selecting movements being of equal length, said means including a mechanical t ming device assoto a plurality of said selector switches 15. In a telephone system, a plurality of ,incominglines, a trunk line; an automatic switch having. movable brushes and contacts for interconnecting said trunk line with any incoming line over which a call is being extended; a line relay and a cut-off relay for each incoming line; sets of contacts for said relays controlled by the energization thereof; an operatingcircuit for said line relay,

extending on the initiation of a call over its incoming line through two sets of contacts of its associated cut-ofit'relay over the two sides of an incoming line in series; a resistance, a battery-and a double wound relay at said switch; (LII'OPBIatlIIg magnet for advancing said switch progressively; a circuit'for said motor magnet extending from one side of said battery through said resistance, the -winding of said motor magnet and contacts of said double wound relay to the opposite side of said mentioned battery; a circuitm multiple of that last described extending through one winding of said double wound relay, through 2L'1I10V2Lbl6 brush and contact of said automatic switch and contacts of said line relay to ground, said last mentioned circuit 'beingeffective co-shunt the motor magnet to stop the operation of said switch and also being effective to energize said double-wound relay; and a holding circuit through the second winding of said double-wound relay for maintaining the connection completed. V 16. In atelephone system, a plurality of incoming lines; a trunk line; an automatic switch for said trunk line for connecting the same with any of said incoming lines on the extension of a call thereover; a single-wound cut-oil relay and a single-wound ciated with said selector switch and common 9 line relay for each incoming line; sets of contacts for each of said relays; an energizing circuit for said line relay completed on the initiation of a call over one of said incoming lines, said circuit including the winding of said linerelay, pairsof contacts of said cut-ofi' relay and the two sides of said incoming line in series; a motor magnet for advancing said switch progressively to suecessively extend said trunk line to said incoming lines, a double wound relay a-ssoci-V ated with said trunk, said double wound relay having a set of contact springs arranged to be opened bythe operation of said double wound relay; a source of battery; an energizing circuit for said motor magnet extending from-one side of said source of battery through the winding of said motor magnet and through the contact springs of said double wound relay; an operating circuit including one windingof said double wound relay and including a portion of the operating circuit of the motor magnet; said last mentioned circuit being closed when said trunk line is extended to a calling incoming line to stop the operation of said motor magnet; a circuit for said cut-oi? relay completed through said switch when said trunk line is being connected to the calling line; and a holding circuit for maintaining the connection, completed through the second winding of said double wound relay.

17. In a telephone system, a plurality of incoming lines; a trunk line; an automatic.

for each of said relays; an energizing circuit for said lineirelay completed on the initiation'of a call over its incoming lines, said cir-.

cuit including the winding of saidline relay, pairs of contacts of said cut-off relay and the two sides of sald incommg line in series; a motor magnet for advancing said switch progressively to successively extend said trunk line to said incoming lines; a clouble wound relay assoclated-with said trunk,

said double wound relay having aset of contact springs arranged to be opened by the operation of said double wound relay a battery, an energizing circuit for said motor wound relay; an operatin circuit for said double wound relay ncluding one winding ofsaid double 'wound relay, and including a portion of the operating circuit of the motor magnet,.said last mentioned circuit being completed at normally open contacts of said line relay, said last mentioned circuit being closed when said trunk line is extended to a calling incoming line to stop the op'er-,

ation of said motor magnet; a circuit for said cut-off relay completed through said pri mary switch when said trunk line'is being "Connected to the calling line; and a holding circuit for maintaining the connection, com pleted through the second winding of said double wound relay. I

In witness whereof, I hereimto subscribe my name this-24th day of October, AJD. 1919.

WINFRED T. POWELL,

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