US2358267A - Telephone system - Google Patents

Description

6 Sheets-Sheet l B. VANDER ELs TELEPHONE SYSTEM Filed sept. 9, 1942 Sept. l2, 1944.

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Sept. 12, 1944. B.'vANDER ELS l TELEPHONE SYSTEM 6 Sheets-Sheet 2 Filed sept. 9.' m42 v. .E RE mn u. m NE. E0 .A wm.. fm m. e@ ou B. VANDER ELS TELEPHONE SYSTEM 6 Sheets-Sheet 3 x Ill Filed Sept. 9. 1942 /N VEA/TOR Sept. 12, 1944. B. VANDER ELS 2,358,267

. TELEPHONE SYSTEM Filed Sept. v9. 1942 6 Sheets-Sheet A.

A /NVE/vmn B. VANDER ELS www Fmi,

AroRA/E B. VANDER ELS TELEPHONE SYSTEM Sept. 12, 1944.

Filed Sept.' 9, 1942 /NVEN 729A BVB. MINDER ELS v Arron/wv e Smets-Sheet e Sept. 12, 1944. B. VANDER ELS TELEPHONE SYSTEM Filed Sept. 9.' 1942 /N'l/EA/rof? By l B. MINDER ELS WWW VM# ArmR/ry Patented Sept. ll2, 1944 UNITED STATES erreur f orties assazsv TELEPHONE SYSTEM Application September 9, 1942, Serial No. 457,697

15 Claims.

This invention relates to automatic switching telephone systems and more particularly to the control of pulse-responsive devices for such systems.

It is the object of the invention to simplify the equipment for controlling revertive impulseresponsive devices.

Some telephone systems known in the art are controlled by the direct impulse method and others by the revertive impulse method. The direct impulse method is used for positioning step-by-step switches or other pulse-responsive devices in which the regulating factor is the pulse transmitter, such as a dial'or pulse repeater. The revertive impulse method is used in large telephone oices, such as the panel or crossbar oflice systems, in which a fundamental circuit is formed between a control device and apulsing device for positioning switches or registers in a sender. This pulsing device may be in the form of a switch commutator or a register controlling relay which in present systems is regulated under the control of a series of counting relays which are marked according to the number of direct pulses received by the control device having the counting relays therein. When the fundamental circuit is closed by a control circuit relay, the distantly related pulsing device operatescontinuously in synchronous relation with the counting relays until the fundamental circuit is opened by a particular counting relay. Ordinarily there are ten pairs of counting relays arranged to count a maximum of ten pulses.

The registers of register senders, such as shown in the'crossbar system of Patent 2,089,921 issued to W. W. Carpenter, August 10, 1937, are of the type which are positioned by the revertiveV impulse method, a fundamental `circuit being shown between the pulsing relays of the sender and the counting relays of another circuit. The same control circuit arrangement has been used for operating and testing senders and it has been found to be a matter of economy to test ten or more senders simultaneously. This requires a large number of sets of counting relays and other`l associated equipment for controlling the number cf pulses transmitted. Y

It is a feature of this invention to associate a simple dial with the control part of the revertive impulse fundamental circuit to function with the pulsing equipment of a sender for the operation of the sender register equipment. f

Another and related feature resides inthe use of one dial in place of a large plurality of counting relays for simultaneously controlling the operation'of a plurality of revertive impulse sendersY for testing the operation of said senders.

These and other features will be discussed more fully in the following description.

Toillustrate the invention and the economy in the use of the invention, reference may be had. to the accompanying drawings, in which:

Fig. 1 illustrates aplurality of senders diagrammaticallyV in the left portion of the 'figure associated with a digit control circuit inthe right and lower-portion of this figure;

Fig. 2 illustrates the remainder of this digit control circuit;

Figs. 3 and 4 diagrammatically illustrate modifications of thefundamental circuit using a dial in the digit control portion of this-circuit;

Figs. 5, 6, and 7 illustrate digit control circuits using counting relays for simultaneously operating a plurality of senders shown diagrammatically inthe left portion of Fig. 5;

Fig. 8 illustratesV a telephone system having an operatorsposition equipped with a dial for controlling a revertive impulse sender;v i

Fig., 9 illustrates the order of assembling the sheets of the drawings. l f

In order to make a comparison from the viewpoint of economy and improvement between the digit control circuit of the invention and other digit. control .circuits for revertive impulse systems, a short description is given in the following paragraphs of the arrangement new in general use. f

A sender of the character operated by revertive impulses is disclosed and described in Patent 2,089,921 issued to W. W. Carpenter, August 10, 1937. `This sender is shown in Figs. 29, 30 and 37 and described in detail in pages 20,`2122 and 23 of the specification. The fundamental circuit extends from a control circuit which may be in another sender, over leads 5819 and 5828 shown in Fig. 58 of this patent. The incoming conductor 58|!! may be traced to conductors 5826 and 3126 thence through a contact on relay 3100, a contact on relay 318 I, winding of what is generally known as the Lv relay 3015 to battery. The incoming conductor 5821] may be traced to conductors 5825 and 3125 and thence through a contact on relay 3188, a contact on relay''llll, through the Vwinding of what is generally known as the stepping or pulsing relay 300B to ground. The L relay 3045 is the equivalent of relay lll vor 9| shown in Fig. 1, 508 or 5I0 lshown in Fig. 5, 3d@ shown in Fig. 3 and 440 shown in Fig. 4. The stepping or pulsing relay 3080 is the equivalent of relay U3 or 93 shown in Fig. 1, 552 or 562 shown in Fig.5, 342 shown in Fig. 3 and M12 shown in Fig. 4.

The fundamental for a control circuit which may be connected with conductors 58|9 and 5820 of Patent 2,089,921 is shown in sender circuit Patent 2,106,360 to R. Raymond, January 25, 1938. The latter patent includes counting relays |220 to |234 and a control circuit stepping relay |202 in Fig. 12 which are connected in the fundamental circuit extending through equipment, as described., to conductors 328 and 329 of Fig. 3 of the Raymond`patent. Conductors 326 and 329 may be connected to the above-mentioned conductors 58|9 and 5820 of the Carpenter patent for controlling the number of pulses transmitted by the sender pulsing relay for registering digits. The fundamental circuit and the method of operating the counting relays in Patent 2,106,360 may be traced from the description given on page 5, column 2, lines 11 to 74 of this patent, and need not be again described herein.

Again referring to Patent 2,089,921, it may be seen that a test operation of the sender can be made by inserting a test circuit plug in the jack shown in the left upper portion of Fig. 37 of the drawings for this patent. The tip spring of this jack is connected throimh a. contact on relay 310|, winding of theL relay 30I5 to battery. The ring spring of this jack is connected through a contact of relay 310|, winding of the stepping relay 3000 to ground. As herein stated, the operation of the sender, the transmission of revertive pulses and the pulse recording by the crossbar registers shown in Fig. 29 are fully described on pages 20, 21 and 22 of this patent and need not be again described herein. In the drawings of this application, Figs. l, 3, 4 and 5, and the register equipment diagrammaticallyshown may be the same as shown in the ACarpenter patent.

. A testing circuit following the practice used at the present time for operating senders of the character shown in Patent 2,089,921is disclosed in Figs. 5, 6 and '7 of` the illustrated embodiment for this application. In order that `the senders of an olice may be rapidly tested, this circuit is -arranged tosimultaneously operate ten senders and for this purpose ten circuits, Fig. 6, areused, only one being shown. The control equipment fused for Fig. 6, therefore, amounts to 200 counting relays, 400 jacks, 50 plugs and other equipment for progressively operating this circuit. v

Two senders are diagrammatically shown in Fig. which represent the rst and last of ten senders of the character shown in the aforementioned patent to Carpenter. The jacks 503 and 5| 3 represent the jacks of ten senders herein referred Each relay in Fig. 7 has ten contacts for simulof the jacks 605 to 609 as required for marking the counting relays to control the number of counting relays to be operated for the incoming brush digit. A similar plug is inserted in one of jacks 6|6 to 624 to control the number of pulses in the incoming group digit. In the same manner similar plugs are inserted in jacks 6I0 to 6|4 for the nal brush digit, in one of jacks 625 to 634 for the tens digit, and in one of jacks 635 to 644 for the units digit.

' The procedure in simultaneously operating ten senders for testing purposes is rst to connect patching cords, such as 504 to 5|4, from the digit control circuit jacks 505 to- 5|5 with sender jacks 503 to 5|3. It may be assumed that the ten senders thus patched to the control circuit are not in use at this time. Plugs such as 60| to 604 are inserted in jacks, such as 605 to 644, one plug taneously establishing ten circuits when operated.

The jacks in the upper portion of Fig. 6 are arranged to control the number of pulses for each of the digits which will be herein known as in- -coming brush, incoming group, nal brush, final trolcircuit for successivelyY registering different digits. A plug, such as is inserted in any being used for incoming brush in one of jacks 605 to 600, another plug being inserted in one of jacks 6|0 to 6|4, a plug in one of jacks 6|6 to 624, a plug in one of jacks 625 to 634 and a plug in one of jacks 635 to 644. As shown onthe drawings, these jacks are grouped for properly marking the starting point of operation of the counting relays in order that the correct number of pulses be counted by the counting relays for each digit, 'and as shown on the drawings, these plugs regulate the number of pulses for the incoming brush, incoming group, nal brush, rlnal tens and nal units digits which are successively regulated by the control testing circuit as switch 120 rotates. For starting the operation of this test control circuit the start key 12| is operated. This establishes a circuit for moving switch 120 from its normal position and advancing it to its second terminal. The circuit for advancing the switch from its normal position may be traced from ground through the start key 12|, terminal and brush of switch arc 120C, contact and windingv of the switch magnet 120 to battery. Upon reaching terminal 2 a circuit is established for the incoming brush vrelay '|00 which extends from battery through its winding, terminal 2 and brush of arc 120A to ground on the start key 12|. A circuitfor lamp 604 is also established to this saine ground to provide an indication of the progressive operation of the control circuit. The lamps 105, 106, 101 and 1|2 are lighted when the associated relays are operated to show the successive registration ofY the various digits. The operation of relay establishes circuits through its'contacts 0 to 9 for controlling ten sets of counting relays, one set being shown in Fig. 6, and also connects ground through its contact i0, No. 2

Vcontact and brush of switch arc C, contact and winding of the magnet 120 to battery which causes the switch brushes to step from terminal 2 to terminal 3. Relay 100 remains operated since a circuit is also established in position 3 for this relay. The fundamental circuit between ten senders and the control circuit is now made effective by the operation of relay 1||. The circuit for this relay may be traced from battery through its winding, contact 3 of switch arc 626B to ground through the brush of this switch arc. At this time the pulsing relays of the ten senders are automatically operated until such time as the fundamental circuit is opened by the end Vcounting relays in each of the ten sets of counting relays.

Let it be assumed that plug 60| was inserted in jack 601 marking the counting relays for incoming brush selection. The counting relay oircuit may thus be traced through a particular path as the relays of the fundamentalcircuit are actuated. It isv believed sufficient to trace the fundamental circuit for operating the Zero sender since the fundamental circuits for the other` nine senders are the same and, therefore,. need not be traced. It may be assumed that ten plugs, such as 60|, are all inserted in a jack of the same number in ten sets of like jacks for operating .the

Vlead 66|, contact of the end counting relay 050A,

lead 080,1ing spring of -jack.505, ring of` patching cord 504, ring spring of jack 503, winding of the sender pulsing or stepping relay 502 to ground. The sender L relay 500, the sender pulsing-relay 502 and` thecontrol circuit stepping relay 508 operate in the circuit traced. Theoperation of` .relay 508 establishes a circuit for the operation of a counting relay which maybe traced from battery, through counting relay 651B, spring of the sender stepping relay 502 andthe control cirf cuit stepping relay 508, causing theirf'release. Countingrrrelay 651A is shunted while relay- 508 is operated, but upon the release of relay 508 it is operated in series with counting relay 651By from battery, through the windingsl of relays 851Band 651A, contact of relay 651B to ground on the contact of relay 1|0. The release of relay 502 releases relay 50| and the fundamental circuit is again established foroperating the sender pulsing relay 502 Vand the control circuit stepping relay 508 to transmit a second pulse and opera-te another counting relay 858B. `Counting' relay 658Boperates through the inner contact of relay 051Ay to ground on the contact of stepping relay 508 over the circuit as previously traced through jack 601. As relay 502 transmits'a second pulse to the register equipment, it also operates relay 50| which again shunts the stepping 4relays 502 and 508 causing their release, This removes the shunt around the winding of counting relay 058A i which now operates in series with relay 658B, as described for the operation of relay 051A.` Relay 50| again releases thus permitting a third operation of stepping relays 502 and 508 'for transmitting a third pulse to the sender register equipment and `for operating a third counting relay 650B.v The operation of relay 502 again operates relay 059A^andoperates inseries withrelay V550B at the Sametime relay 859A isoperated. There is, of course, one relay 610 foreach of the ten sets of counting relays. Thus, while the fundamentalis held open, a circuit is established-from ground on the contact of relay 610, through the thirdcontact and brush of switch arc/120C, contact and winding of the switchmagnet v120 to battery for' advancing the switch brushes to terminal 4. Relays and1|| are released and a circuitis established for rela'ys '|00 and 1|0 upon the rotation of the switch brushes from terminal V3 to terminal 4. The release of cut-in relay1|| 'opens the ten fundamental circuits extending throughy the contacts 0:1500 so rthat the fundamental oircuits will remain open after the count- :ing relays have been released. The operation of relays 100 and 110 opens the holding circuits extending through their contacts 0 to '9 for all counting relays whichwere operated causing vthe release of the counting relays. Relays 109 and 1|0 establish a` circuit through contact l0 of both relays for operating the slow-release relay 123, the latter relay establishes an'obvious circuit for Amoving*the'switch brushes fromV position '4 to position 5. In switch position 5 a circuit is established for incoming group Vr'elay'10l and progress f lamp 105. This circuit extends from battery,y

through the Awinding of the relay and lamp, terminal 5 and brush of switch arc 120A to ground on the contact of start key 12|. The operation of the incoming group relay 10| establishes acircuit for moving theY switch brushes to terminal 6 which maybe traced from ground on contact I0 of relay 10|, terminal 5 and' brush of arc 120C, contact and winding ofthe switch magnet to battery. It will be vnoted that in switch position 8 'the Acircuit for the incoming group relay 10i remains established. e

In switch position 8 a circuit is established for cut-inrelay 1|| which isthe same as previously traced.` The fundamental circuits are now estab- V.lished vrforincoming group pulses from'the ten senders to the control circuit through the ten contacts of relay 1| The counting relay control for group selection extends Aover circuits through thence through ten jacks, such as jack BIS, and ten plugs, such as 802, winding of counting relays,

such as 553B tov battery which operates the ten counting relays to-start the control of the sender pulsing which proceeds in the same Vmanner as previously described until the fundamental is opened by the end counting relays suchy as 658A.

The operationof theten senderswfor setting the registers under the control of the counting relays as the switch '|20 advances is the same for final brush, final tensand nal units and it is believed that this operation willbe well understoodv Afrom theV descriptionV herein given so that vthe description of Figs.l 5, 6 and '7Amay be terminated at this point. Other devices, not shown,

are used for observing the operation of the senders and for restoring switch '|20 to normal when a test is completed.

Figs. l and 2 diagrammatically show two of the same character of senders as shown in the aforesimultaneously controlled andtested by the digit control and testing circuit shown in these figures of the drawings. This control circuit provides full control of the senders over the usual fundamental circuit Without the use of a large plurality of counting relays and a large plurality of jacks such as shown in the control circuit of Figs. 5, 6 and 7. In the arrangement of Figs. 1 and 2 the operation of the plurality of senders for setting the sender registers is under the control of a single dial and a progressively operable switch.

The ten senders of Fig. 1 are connected to the control circuit by inserting patching cords and plugs 06 to 96 in the sender jacks 05 to 95 and control circuit jacks 01 to 91 in the same manner as described for connecting the senders of Fig. 5 with the control circuit of Figs. 5, 6 and 7. The start key 201 is then operated which provides an obvious operating circuit for the start Vrelay 206. This start relay provides ground circuits for various operations which will be apparent in the description. Relay 222 is operated from battery through its winding to ground on contact 2 of start relay 206. 'Ihis .relay provides signaling paths for lamps 09 to 99 to indicate that the testing circuit is associated with ten idle senders. This circuit extends from battery through lamp 09, contact of relay 222, sleeve of jack 01, sleeve of patching cord 06, sleeve of jack 05 to ground on the contact of the sender relay 04. A similar circuit may be traced for lamp 99 through contact 9 of relay 222. Other similar circuits extend through the contacts of this relay. Relay 22| is energized from battery through its winding, contacts 5 and 4 ofdial 220, to ground on contact 6 of the start relay 206. Relay 22| places a shunt ground through its contacts to the ring conductor of all senders which causes the release of the sender pulsing or stepping relays 03 to 93. released and operated a number of times during the backward movement of the dial after the dial hasbeen moved forward to a particular position by the engagement of a particular finger notch. The stepping magnet 2|0 is energized from battery through its winding, brush and contact I of switch arc 2|0A, contacts I and 2 of the dial to ground on contact 8 of the start relay 206.

The switch does not, however, step its brushes to terminal 2 until this circuit is opened by the forward movement of the dial, since the switch is what is known as a backstroke switch. Lamp 236 is connected to the first` terminal as a signal showing that the switch is in the correct position to begin the control of the senders. The circuit for lamp 236 is from battery, through the filament of the lamp, terminal I and brush of switch arc 2|0,F, contact I0 of start relay 206 to ground.

The senders may now be controlled for incoming brush selection by the manipulation of the dial 220. It should be here pointed out that one pulse is registered in the sender when a jack of the sender is connected by the patching cord to the jack in the control circuit since at that time battery through resistance l0 or through resistance |00 is connected through the winding of the sender pulsing relays 03 and 93 which operates these relays. The operation of the pulsing relays operates relay 02 and relay 92 which in this instance operate the L relays 0| and 9| cause a pulse to be transmitted to the register equipment of the senders. Th dial must therefore be manipulated accordingly so that the dial notch 4 will be used if the sender pulsing relay is to It will be apparent that relay 2| is .f

operate live times. Assuming that the dial notch 4 is used for incoming brush selection, the circuits are established in the following order when the dial is moved off-normal. The forward movement of the dial opens the dial spring contacts l and 2 which openithe circuit for switch magnet 2|0 causing the brushes 'to be stepped forward to position 2. The forward movement of the dial causes the engagement of dial contact 2 with dial contact 3 which establishes a circuit for the fundamental relay 20| from battery through the winding of this relay, contacts 2 and 3 of the dial to ground on contact 8 of start relay 206. The latter dial contacts remain closed and relay 20| remains operated until the dial returns to its normalposition. The operation of relay 20| connects ground through its contacts 0 to 9, lamps 08 to 98, tip springs of jacks 01 to 91, patching cords 06 to 96, tip springs of jacks 05 to 95, windings of L relays 0| to 9| to battery. This circuit maintains the L relay 0I operated 'during the non-pulsing periods of relays 03 and 02 and maintains the L relays of the other nine senders operated during the non-pulsing periods of the other' to 93 which operate over circuits'to battery through resistances I0 to^|00 during the progress from notch 4 to its normal position which causes relay 22| to be released and operated four times. The release of relay 22| removes the ground shunts from the operating circuits for the pulsing relays 03 to 93. The operation of relays 03 Vto 93 causes the operation of relays 02 to 92 whichtransmit pulses to their respectively associated registers and maintain operating circuits for other respectively associated L relays 0| to 9| during this pulsing period. The operating circuit for the L relays 0| to 9| from ground on their respectively associated relays 02 to 92 shunts the current Vsupply for lamps 08 to 98 during the pulsing period and thus indicates to an observer the number of pulses transmitted as the dial returns to its normal position. Each operation of relay 22| establishes a shunt for pulsing relays 03 to 93 which causes the release of these relays and the release of relays 02 to 92. The return of the dialto its normal position opens the circuit for the relay 20| which opens the ten fundamental circuits. The L relays 0| to 9| now release so Vthat the sender register equipment may be automatically adjusted for receiving the pulses of the next successive digit.

During the time that relay 20| was operated.,

which is equivalent to the forward and backward movement of the dial for controlling a series of pulses comprising a digit, a circuit is established through contact I0 of relay 20|, terminal 2 and brush of switch arc 2|0A, switch magnet 2|0 to battery. The return of the dial to its normal position separates dial contacts 2 and 3 which restores relay 20| and opens the circuit extending through the winding of the switch magnet, thus causing the switch to advance its brushes from terminal 2 to terminal 3.v

The second manipulation of the dial controls the sender pulsing relays for incoming group J Y -2,358,267f selection in themanner as'described for incoming brush selection and the switch advances'one terminal upon the return of the dial-to its normal y position. The third manipulation of the -dial controls final brush selections, the fourth -manipg ulation of the dial controlsnal tens selections,-

and the fifth manipulation of the dial controls nal units selections. These are the same selec-Y tionsas described for-the control circuit of Fig's.

5, 6; and 7 in which the counting relays controlled thenumber of pulsesv transmitted by )thevsender arecOunted' equivalent'to' the `finger notch used in moving thedial forward' tothe linger stop. `It

will 'be noted that'by the use of'this modification; y

the pulsing relay `303' does not Voperate until the return movement of the dial and, thereforaa' pulsing relays into the sender registers instead of having the number of pulses controlled by the .simple dial 220. The 1amps`23| to 235 indicatem zthe progress of the control circuit in a similarl manner to the signallamps suchas 604 asso `ciated with the relays of Fig. 7.

Fig.. 3 illustrates amodication of the funda# mental circuitshown. in Figs. 1 and 2. The send- .er equipment is disclosed inithefleft portion and :the control circuit in the right portion of this'.

gure. -For this diagrammatic showing. of the 1 of this gure.

cuit. A stepping relay of this'chara'cter is used in the digit controlcircuitshow'n in Figs'. 5,16 and 'l for operating the counting relays'fthrough its contact.;A 'It may'beassumed that the same" type fundamental, the progress switch isnot provided.

The particular diiference: between the'control circuit of Fig. 3 and the control circuit of Figs. 1 and 2 resides in the use of relay 334 whichisv operated from a contact of relay 346. Relay .346

may be assumedto be the same as relay 20| of Fig.V 2. e Relay 5345 may be assumed to be the same as relay 22| of Fig. 1. Arelay, such as relay 222, isnot shown. It may ber assumed that the senders are connected vwithlthe control circuit by attaching cordsV inthe same manner as shown in Fig. 1. Thus thev senderin the left portion of Fig. 3 is connected to the control circuit in the right portion of this figure. 'Ihe start relay 335,

which may be substantially the same as the start relay 206.'.of Fig. 2, isoperated by the start key' 301. The operation of the start relayconnects ground through contacts4 and 5 of the dial 350,

winding of relay 345 to battery, operating the latter relay. This places a shunt on the pulsing `relay 303 so that it will not be operated until such timeas the contactof. relay 345 is open upon the return movement of the dial after it has beenmoved to the finger stop` and released. When the dial is moved forward from its'normal position, a circuit is closed for relay 346 which connects ground through lamp 332, winding of the L` relay 30| to battery, operating the L relay. 'I'he operation of the L relayv establishes circuit of patching-cords as shown in Fig. f1 fare used for.Y

associatingthe digit controlv circuit of Fi'gfl with the senders of Fig. 4. The operation of the lock`r ing ystart key "446 e'nergizes relay 445-which associates ground with the fundamental circuit 'b'el-v 2 tween'the windings ofY control'relay 444 and the l When thedial'is'moved forward' from its normal position, the funda" f mental circuit is closed throughcontacts2fand '3" of the dial, winding 'of'rel'ay 444,"co'ntacts 'and 3f of relay'445 to ground. The sender 'L vrelay 440 and r'e'lay444 are thus energized from battery' through the winding. of .relay 440, resistance v446,' contacts 2 and'3 off'dial 450, winding of relay '444 to groundfthrough contacts 3 and of relay 445.`

sender pulsing relay 442.

. At thistime `relay 442 is shunted by/ground from l 444 remains operated and its contact remainsA i open and consequently the senderpulsing relayrv lfor operating yrelay 355 to prepare the register equipment for receiving pulses when the pulsing relays 303y and 302 are operated. .The operation of relay 346 also establishes a circuit for operating 334. YThe operation of relay 334 connects battery through resistance 333 to the ring conductor of the fundamental, but since at this time ground is connected to the ring conductor of the funda--r mental, through the contact of relay 345, the pulsing relay 303 will not operate. After the dial has been moved forward to the finger stop` and released, contacts 4 and 5 are intermittently open as the dial returns to its normal position. The opening of contacts 4 and 5 causes the release of v relay 345 which removes the ground shunt from ring conductor of the fundamental. 'Ihus a circuit is established for the pulsing relayl 303 iromground through its Winding over the ring conductor, contact of relay 334, resistance 333 to battery. Relay 303 establishes an obvious circuit for relay 302 which transmits a pulse to the register equipmentandrassqciates ground with the tip conductor for establishinga holding circuit for' the L relay 30| during lthe pulsing period.

.the contacts'of relay 445.1The operation of the L relay 440.establishes an operatingV circuit for relay 441 to prepare the registering equipment for receiving pulses later 44| are'operated.- f f When the dial is moved forward to the nger stop and released, 'fthe dial contacts 4 and '5. are open causing the rst release of relay 445. Relay' 442 operates in 'serieswith 'relay 444 toibatter'y,

also lremains operated. `The operation of'relay 442 energ'izesv relayV 44| relay 440 t' battery, holding the 'L' relay operated during the pulsing period. .A Connecting this ground with the tip lead also shunts relay 444 1 and relay V442 causing'their release and the release of relay 44 VRelays 442 and 444 operatev and 'release very rapidly and, "therefore, an

through contacts and2 of relay 445a`ndY the contact of'relay 444 to 'shunt'relays 444 and 442 and maintain anoperati'ng circuit `for vthe L relay 440. j-Upon the next "closure of contacts' 4 and 5,

and3 of relay 445' to battery,Y throughfthe'wind;

is not registered by theregister'v n when relays 442-"and" which transmits 'a pulseV f into the registerV equipment and associates ground withthe tip' lead through the winding' of the LY t5 arrangement ispro" videdr ytov prevent these' relays" from operating f again' if relay'445 has not lbeen operatedby the time relays 442 and 444 have been released'after relay 544| has transmitted the first pulse. If the' dial'contacts 4 and l5 havenot again 'closed;-and again operate relay 445 whemrelay' 444 is "re-l leased; a' circuit is established 'frorn ground ing of the L relay 440. The operation of relay 444 opens its contact so that the pulsing relay 442 operates again in series with relay 444 when dial contacts 4 and5 open and release relay 445.

The pulsing continues inthis manner for setting the registers, and the digit control circuitA equipment is maintained in synchronism with the pulsing equipment of the sender until the dial has returned to its normal positionrwhere the funda- ,mental circuit extending to the L relay 440 isi opened by dial contacts 2 and 3 causing the release of the L relay so thatthe register equipment may be automatically adjusted for receiving the next digit. Relay 445 remains operated Vuntil vthe dial is again moved forward and released for intermittently opening the dialcon tacts 4 and 5 to register the next digit and during this time shunts the pulsing relay442 from ground through itscontacts I and 3. The dial is thus moved forward and released as many times as required for controlling the fundamental pulsing equipment to register a certain number of digits in the sender. The start key may then-be 'released for releasing relay 445 after'the last equip such switchboard positions with a dial arranged for the direct pulsingmethod the same as a subscribers stationdial or with a key pulsmay operate a line finder 80| and selecting switch 802 of the usualV type known in the art, for connecting the subscriber A with the operators position and the calling subscriber is challenged Vby the operator in the operators position to as# certain the destination of the call. Various characters of telephone equipment are contemplated for connecting the calling party with the operators position. When the destination of they call requires the use of a" revertive pulse sender for setting the outgoing switches 830 and 83|, an outgoing circuitl is selected by a plug or a switch extending to a link for connecting a revertive pulse sender with Ithe outgoing circuit from the operators position. Key 8 8 is actuated for connecting the digit control circuit with the fundamental circuit and start key BIS is actuated which establishes an obvious circuit for relay 813. The operation of relay 8I3 establishes an operating circuit for relay 814 through contacts 4 and 5 of the dial 8|9. Relay 8|4 connects a shunt ground with one leg of the fundamental extendingtoward the winding of stepping relay 822 of the revertive pulse sender.

The switchboard operator manipulates the dial 8|9 when an idle sender has been connected to the operatorsposition circuit for regulating the number of revertive pulses comprising the first digit. The movement of the dial 8I9 away from its normal position closes the dial contacts 2 and 3 which establishes an obvious operating circuit 5 for the fundamental closing relay. SI5. The latter relay connects ground through its upper contact, lamp 8|0, right contact of key 8l8, winding of the L relay 820 to battery which operates theV L relay 820 and lights lamp 8I0. The L relay 820 no-w establishes an operating circuit for revlay 823 which establishes a circuit between relay ing key set, neither of which are arranged for Y u controlling a revertive pulse sender. Therefore, when revertive pulse senders are associated with an operators position, it has been the practice to place another sendery between the operators position and the revertive pulse sender.

The sender which is used between the operators position and the revertive pulse sender may' be of the' type disclosed in Patent 2,106,360 to R. Raymond, January 25, 1938, to which reference has already been made, or other senders of this character shown in the art which are set from directV dial pulses or by pulsing key sets and which are arranged Yto convert or translaterthe digits registeredrfrom direct pulses for controlling `a revertive pulse sender of the character shown by W. W. Carpenter in the aforementioned Pat-r ent 2,089,921.

The useV of the revertive pulse digit control circuit of the invention in the operators position circuit as shown, eliminates the requirement for a group'or plurality of senders of the type shown by Raymond between the operators position and the revertive pulse senders, the latter senders being controlled directly by the operators digit control circuit which includes a dial adaptable for such control instead of the direct pulsing dial. The revertive pulse Vsender diagrammatically rshown in Fig. 8 may be of the type shown in the aforementioned patent to Carpenter and the revertive pulse digit control circuit may be arranged as shown in either Figs. 1 and 2, or the modifications Fig. 3 or 4.

An incoming call Yfrom subscribers station A 82| and the sender registers over which a pulse is transmitted upon each operation of the sender pulsing relays 822 and 82|. Relay 8|5 also establishes 'an obvious circuit through its lower contact for operating relay 8|2. The latter relay connects batteryv through`resistance 8H and the` relay contact, windingof relay 822 to ground. This circuit is however not effective Afor operating relay 822 until relay8l4 isreleased to re-` move the shunt ground from this conductor of the fundamental circuit. P

The Vdia1 contacts 4 and 5 are opened after the switchboard operator has moved the dial to the finger stop by engaging a particular finger grip and the dial has been released. so that it mayJ return'to its normal position. A linger grip is engaged by the operator according to the number of pulses to be counted for the digit. The opening of dial contacts 4 and 5 releases relay 8|4 which removes the ground shunt from the associated leg of the fundamental circuit. Relay 822 now operates from ground through its winding, contact of relay 8|2, resistance 8H to battery. Relay 8:22 operates relay 82| over an obvious circuit and the latter relay transmits the assage'? ber of times the dial contacts 4 and 5 are opened as the dial returns to its normal position.

When the dial has restored to normal, contacts 2 and 3 are opened causing the release of relay 8l5 which opens the operating circuit for the sender L relay 820. The release of relay 820 signals the sender that the last pulse of the digit has been transmitted and adjusts the registering equipment for receiving the pulses of the succeeding digit which are registered upon the next operation of the dial. Successive operations of the dial set the registers of the sender in the manner described, for controlling switching connections after the last digit is recorded as shown in the aforementioned patent to W. W. Carpenter, for connecting the calling subscriber A to the called subscriber B.

It is not contemplated that the invention be limited to the specific uses illustrated since there are other telephone system arrangements in which this revertive pulse control circuit may be used to effect considerable economies.

What is claimed is:

1. In a telephone switching system, a switch controlling circuit, a digit controlling circuit, a

' revertive impulse fundamental circuit extending from said switch controlling circuit to said digit controlling circuit, the switch controlling circuit portion of` said fundamental circuit comprising a relay operable by said digit controlling circuit during non-pulse periods for arranging said switch controlling circuit for receiving pulses, and a pulsing device for operating said switch controlling circuit and for holding said y relay operated duringr the pulse transmitting periods, and means including a dial for closing said fundamental circuit when said dial is moved forward from its normal position, for

regulating the number of pulses transmitted by sender to said control circuit, the sender portion of said fundamental circuit comprising a relay operable by said control circuit during the non-pulsing period for arranging said registers for receiving pulses, and a pulsing device for operating said registers with means in said pulsing device for holding said relay operated during the pulse transmitting period, and means including a dial for closing said fundamental circuit when said dial is moved forward from its normal position, for regulating the number of pulses transmitted by said sender pulsing device to said registers on its backward motion and for opening said fundamental circuit upon arriving at its normal position.

3. In a telephone switching system, a plurality of switch controlling circuits, a digit controlling circuit, a revertive impulse fundamental circuit extending from each of said plurality of switch controlling circuits to said digit controlling circuit, the switch controlling circuit portion of each fundamental circuit comprising a relay operable by said digit controlling circuit during Ynon-pulsing periods for arranging each switch cuits and for holding said relays operated during the' pulsetransmittingV periods, and meansl including a single dial for causing 'the closure of said plurality of fundamental circuits when said dial is moved forward from its normal position, for regulating on its backward motion the number ofpulses transmitted by the pulsing devices in each of said switch controlling circuits and for causing the opening of said yplurality of fundamental circuits upon arriving in its normal position.l I Y 4. In a telephone switching system, a switch controlling circuit, a digit controlling circuit, a revertive impulse fundamental circuit extending from said switch controlling circuit to said digit controlling" circuit,v the switch controlling circuit portion of said fundamental circuit comprising a relayoperable by said digit controlling circuit during non-pulsing periods for arranging said switch controlling circuit for receiving pulses, and a lpulsing device for operating said f switch controlling circuits and for holding said relay operated during the pulse transmitting period, the digit controlling circuit portion of said fundamental circuit 'comprising a dial having springs thereon which are open when the dial is in its normal position and closed when the ldial, is moved from its normal position, and other springs which are intermittently opened and closed during the backward movement of said dial, means for closing said fundamental circuit and operating said relay by the closure of said first springs withv the `dial moved from its normal position, and means for regulating the number of pulses transmitted by said pulsing device by the movement of said other springs during the backward movement of said dial to normal where said fundamental circuit is again opened responsive to the opening of said first springs..

5. In a telephone switching system, a switch 'controlling circuit,` a digit controlling circuit, a

revertive impulse fundamental circuit extending from said switch controlling circuit to said digit controlling circuit, the switch controllingcircuitVV portion of said fundamental circuit comprising a relay operable by said digit controlling circuit during non-pulsing periods for arranging said switch.y controlling circuit for receiving pulses and a pulsing device for operating said switch controlling circuit and for holding said relay op- `erated during said pulse transmitting period, the digit controlling circuit portion of said fundamental circuit comprising a dial and means to close said fundamental circuit by movement of "said dial away from its normal position which establishes an operating circuit for the relayv in said switch controlling circuit before the pulsing circuit in said fundamental is established, and other means forestablishing a circuit for the pulsing device and for regulating the number of lpulses in a digit during its backward movement to its normal position where said fundamental `circuit is again open by said rst means.

6. In a telephone switching system, a switch vcontrolling mechanism, registers, a digit controlling mechanism, a revertive impulse fundamental circuit extending from said switch controlling mechanism to said ydigit controlling mechanism, pulsing devices in the switch controlling portion of said fundamental circuit for transmitting pulses to said registers and for transmitting equivalent revertive pulses over said fundamental circuit for controlling said pulsing devices, a dial in said digit Icontrolling mechanism,`a synchronizing device in saidcontrol mechanism under the control of said revertive pulses and said dial and means in said dial in combination with means in said synchronizing device for regulating the number of pulses in each digit. Y Y

7. In a telephone switching system, a plurality of switch controlling senders having digit registers therein, a digit ycontrolling circuit, revertive impulse fundamental circuits i extending from said plurality of switch controlling senders to said digit controlling circuit, pulsing devices in the switch controlling portion of eachy of ysaid fundamental circuits for transmitting |pulses to said respective registers and for transmitting equivalent revertive pulses over said respective fundamental circuits for controlling said pulsing devices, a single dial in said digit controlling circuit, a synchronizing device in said control mechanism under the control of said revertive pulses and said dial and means in said dial in combination with means in said synchronizing devi-ce for regulating the number of pulses for each digit for setting the registers in said' plurality of switch controlling senders.

8. In a telephone switching system, switches, incoming lines, outgoing lines, a telephone operators position, means for connecting an incoming line with said operators position, a revertive pulse sender having registers therein for controlling switching connections to connect an incoming line to an outgoing line, a revertive pulse digit controlling mechanism in said operators position, a revertive pulse fundamental circuit extending` from said digit controlling mechanism to said sender, means for connecting said digit Icontrolling mechanism to said fundamental circuit, pulsing devices in the sender portion of said fundamental circuit for transmitting pulses to said sender registers, and means including a dial in said digit controlling mechanism for closing said fundamental circuit to establish circuits for said pulsing devices and for regulating the number of revertive pulses in each digit to set the registers of said sender for establishing a connection between said incoming digit controlling mechanism in said operators position, a revertive pulse fundamental circuit extending from said digit controlling mechanism to said sender, a key for connecting said digit controlling mechanism to said fundamental circuit, pulsing devices in the sender portion of said fundamental circuit for transmitting pulses to said sender registers, a dial in said digit controlling mechanism, means including said dial for controlling said revertive pulse fundamental circuit to establish circuits for said pulsing devices ,when said dial is moved forward away from its t normal position, and after it `has been moved Y forward and released, for regulating the number of pulses in a digittransmitted byy said sender pulsing devices for setting the registers of said senders for controlling the switching connection between said incoming line anda particular outgoing line. Y

10. In a telephone switching system, register mechanism, a revertive pulse fundamental circuit of the type having pulse transmitting devices controlled by the shunt method and having a relay which'is operable when `the fundamental circuit is closed, said relay establishing a connecting circuit between said register mechanism and said pulsing devices for setting said registers responsive to the operations of said pulsing devices, a digit pulse controlling mechanism forY said fundamentalcircuit having a telephone dial,

means in said dial for causing the closure of sa-id fundamental circuit when moved away from its normal position, a shunt device, and other means in said dial intermittently operated as said dial restores to its normal position for controlling said shunt device for regulating the number of operations of said pulsing devices for a digit for setting said registering mechanism.

il. In a telephone switching system, a sender having registers for controlling switching operations, a revertive pulse fundamental circuit of the type having a` stepping relay and a pulsing relay controlled by the shunt method and having a line relay which is operable when the fundamental circuit is closed, said line relay establishing a connecting circuit between said sender registers and said pulsing relay for setting the registers responsive to the operations of said stepping and pulsing relays, a digit pulse control mechanism for said fundamental circuit having a telephone dial,` means in said dial for causing the closure of said fundamental circuit when moved away from its normal position, a shunt device and other means in said dial intermittently operated as said dial restores to its normal position for controlling said shunt device for regulating the number of operations of said stepping and pulsing relays for a digit for setting the registers of said'sender.

412. In a telephone switching system, a plurality of switch controlling senders each having registers, a revertive pulse fundamental circuit for each sender of the type having pulse transmitting devices controlled by the shunt method and having a relay which is operable when the fundamental circuit is closed, the relay of each fundamental circuit establishing a connecting circuit between the register mechanism and the pulsing devices in each sender for setting the registers responsive to the operations of said pulsing devices, a single digit pulse control mechanism for said plurality of fundamental circuits having a single telephone dial, means in said dial for causing the closure of said fundamental circuits when moved away from its normal position, a shunt device in said control mechanism and other means in said dial intermittently operated as said dial restores to its normal position. for controlling said shunt device for regulating the number of operations of said pulsing devices for a digit for setting the registering mechanism of all of said plurality of senders.

13. In a telephone switching system, a switch controlling circuit having registers, a digit controlling circuit, Va revertive pulse fundamental circuit extending from said switch controlling circuit to said digit controlling circuit, the switch controlling `circuit portion'of said fundamental circuit comprising a relay operable by said digit controlling circuit during non-pulsing periods for arranging said switch controlling circuit for receiving pulses, a pulsing device for operating said switch controlling circuits and for holding said relay operated .during the pulse transmitting period, the digit controlling portion of said fundamental circuit comprsing a telephone dial, contact springs in said dial which arey open when the dial is in its normal position and closed when the dial is moved away from its normal position, other contact springs in said dial which are intermittently opened andclosed during the restoring movement of said dial, means under the control of said rst springs for `closing said fundamental circuit when said dial is moved away from its normal position, and a shunt device under the control of said other springs for controlling the number of operations of said pulsing devices for a digit for setting the registers of said switch controlling circuit.

14. In an automatic telephone system, a sender register control mechanism 'comiected to a revertive pulse fundamental circuit of the type in which relays including a stepping relay are operated when the fundamental circuit is closed for transmitting pulses to a register and the stepping relay is released yloy the application of a shunt to a leg of the fundamental circuit as each pulse is transmitted, a digit pulse controlling telephone dial, contacts in said dial connected with said fundamental circuit for closing the fundamental circuitwhen said dial is moved away from its normal position and other contacts in said dial intermittently opened andclosed on its return movement to its normal position for regulating the number of times said step-ping relay is operated and released for the pulses of a digit and a relay under the control'of said shunt and said Yshunt to a leg of the fundamental circuit as each pulse is transmitted, a digit pulse controlling telephone dial, contacts in said dial connected With said fundamental circuit' for closing the fundamental circuit when said dial is moved away from its normal position and other contaots in said dial intermittently opened and f closed on its return movement to its normal position for regulating the number of times said 20 stepping relay is operated and released for ythe pulses of a digit,oa synchronizing relay in said fundamental circuit released by said shunt simultaneously with the release of said stepping relay and a contact on said synchronizing relay in a 25 circuit controlled by said other dial contacts for synchronizing the operations of said stepping relay with the operations of said other dial contacts.

BARTH VANDER. ELS.

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