US1811146A - Automatic telephone system - Google Patents

Automatic telephone system Download PDF

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Publication number
US1811146A
US1811146A US538551A US53855122A US1811146A US 1811146 A US1811146 A US 1811146A US 538551 A US538551 A US 538551A US 53855122 A US53855122 A US 53855122A US 1811146 A US1811146 A US 1811146A
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United States
Prior art keywords
relay
armature
circuit
switch
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US538551A
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English (en)
Inventor
Rodney G Richardson
Martin L Nelson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automatic Electric Inc
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Automatic Electric Inc
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Filing date
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Priority to FR568149D priority Critical patent/FR568149A/fr
Application filed by Automatic Electric Inc filed Critical Automatic Electric Inc
Priority to US538551A priority patent/US1811146A/en
Priority to GB6905/22A priority patent/GB193694A/en
Priority to US54786622 priority patent/US1702392A/en
Priority to GB11287/22A priority patent/GB194580A/en
Priority to DEA38438D priority patent/DE551234C/de
Priority to FR27010D priority patent/FR27010E/fr
Priority to FR27031D priority patent/FR27031E/fr
Priority to FR27030D priority patent/FR27030E/fr
Priority to US60727022 priority patent/US1646262A/en
Priority to FR27949D priority patent/FR27949E/fr
Priority to FR28100D priority patent/FR28100E/fr
Priority to GB19481/23A priority patent/GB208509A/en
Priority claimed from US659304A external-priority patent/US1683857A/en
Priority to FR28470D priority patent/FR28470E/fr
Priority to FR30529D priority patent/FR30529E/fr
Priority to GB5658/25A priority patent/GB230104A/en
Priority to GB6423/24A priority patent/GB220923A/en
Priority to FR31050D priority patent/FR31050E/fr
Priority to US297609A priority patent/US1691410A/en
Application granted granted Critical
Publication of US1811146A publication Critical patent/US1811146A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
    • F16K31/20—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve
    • F16K31/24—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve with a transmission with parts linked together from a single float to a single valve
    • F16K31/26—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a lift valve with a transmission with parts linked together from a single float to a single valve with the valve guided for rectilinear movement and the float attached to a pivoted arm
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Definitions

  • the present invention relates in general to automatic telephone systems, but more particularly to systems of the well-known Strowger or decimal type; andthe general object of the invention is the provision of new and improved circuit arrangements and apparatus which enable the Strowger system to be conveniently used in largesystems having complex multi-oiiice networks.
  • the Strow er system has been'used for large multi-o ce systems before this, and with considerable success, but its use under such conditions is not all that could be ,desired owing to the inflexibility of the inter-olce trunking, which must correspond to the directory numbering.
  • the rigid association of the trunking with the numbering is also objectionable where existin manual networks are converted to automatic operation, for in such cases it is usually desirable to retain the old manual exchange names as part of the automatic numbering system and the occurrence of similar names in different areas and dissimilar names in the same area renders itA exceedingly difficult to arrange ⁇ the trunking on an economical and eiiicient basis.
  • Figs. 1to12 inclusive, of which 'the first ten are circuit diagrams of the a paratus
  • Fig. 11 is a schematic diagram showing how the various v sheets should be joined together
  • Fig. 12' is a front view of the subscribers calling device, showing the numbering of the dial.
  • the substation A is an automatic substation of the usual type, having .the usual transmitter, receiver, and ring- ⁇ Aa forward direction only.
  • the line switch C has access to a plurality of trunk lines, one of whichis shown in the drawings as extending by way of the relay equipment D to the first selector E1, Fig. 2.
  • the relay equipment D Q is ,inserted in the trunk in order to provide for connecting and disconnecting a' registering and translating equipment at the proper time.
  • the first selector E1 is a Strowger vertical and rotar switch lof the usual type, having its ban contacts arranged in ten horizontal rows or levels.
  • selectors E2 and E22 also shown in Fig. 2, are similar to the rst selector El. At the right of the selector E22 is shown a trunk line extending to an operators positionr and there terminating in jack J.
  • the lower half of Fig. 3 shows a secondary line switch C1 and a repeater R.
  • the former is accessible to the second selector E2 and other similar selectors, and in construction is similar to the primary line switch C.
  • the repeater R is adapted to repeat automatic switch operating impulses received over the two sides of the trunk in series, and is provided with a repeating coil in lieu of the condensers which have been-widely used heretofore.
  • the upper half of Fig. 3 shows third and fourth selectors E33 and E, which are similar to the selectors already described, and the repeater R1, which is the same as the repeater R.
  • Fig. 4 shows the third selector E3, and the fourth selectors E4 and E4, together with the repeater R2, all of which arethe same as the selectors and repeaters previously described.
  • Fig. 5 shows an' automatic connector switch H, which is ofthe usual Strowger vertical and rotary type', and which is adapted to re- 1D0 spond to two successive series of impulses in order to direct its wipers to the contacts of a particular line to which it has access, differing in this respect from the selector switches hereinbefore referred to, which respond to only one series of impulses and which have an automatic trunk hunting movement.
  • the mechanical construction of the connector H is, however', very similar to that of the selectors.
  • the rotary line switch C2 is individual to the line of station A1 and is similar to the line switch C, Fig 1.
  • a complete set of registering and translating equipment may be called a director from its function of directing or routing calls to their proper destinations.
  • One such complete equipment, or director is shown in Figs. 6, 7 8 and 9, and the lower half of Fig. 1.
  • This director comprises the finder F, Fig. l; the master digit controller M1, Fig 6; the A impulse register M1, Fig. 6; nine Strowger switch mechanisms for registering the B and- C impulses, of which one is shown at H1, Fig. 7 the thousands register M1, a hundreds register M5, a tens register M8, and a units register M7, all of which are shown in Fig. 6; an impulse sending switch S1, Fig. 8; a sequence switch S2, Fig. 9; and the intermediate distributing frame I.D.F., Fig. 7
  • the finder switch F is similar to the rotary line switch C.
  • This finder switch together with the finders ⁇ which are allotted to other directors, has access to a group of trunk lines, one of which is the trunk line shown in the drawing and extending to the first selector E1.
  • the finder F has twenty-five sets of contacts in its bank, which is the usual size,there would be twenty-tive trunks in thei group to which the finder has access, requiring the provision of about six or seven directors to handle the traiiic.
  • any other convenientmethod of associating the directors with the trunks may be employed if desired, such for example as the scheme of providingrotary switches individual to the trunks which hunt for idle directors.
  • the master digit controller M1, the A impulse register M2, and the 4 digit registers M4 to M7, inclusive, are simple ten-point step by step switches, each of which is provided with an operating magnet and a release magnet, and a set of off normal springs which are operated when the switch wipers lare advanced out of their normal pos1tion. ⁇
  • the Strowger switch mechanism H1 is the .same in mechanical construction as an ordi- 220 to 223, inclusive, and shown near the center of the drawing, Fig. 7 which also shows a portion ofthe first and second levels of the bank to which these wipers have access.
  • Each of the other eight Strowger switch mechanisms in this particular director is also provided with 4 wipers, and the wipers of all the switches are connected in multiple.
  • the banks, however, are not multipled, but each set of 4 contacts has a set of 4 individual wires which is terminated on the left hand side of the I.D.F.
  • each Strowger switch in the director is wired up to the left hand side of the I.D.F., the same as has been explained in the case of the switch H1; thus it will be seen that there will be 400 wires coming from each switch, or 3600 wires in all. There are also some additional wires coming from the relays shown in Fig. 9, which will be explained hereinafter.
  • the right hand side of the I.D.F. consists of 13 continuous strips or .bus-bars or multipled terminals, with facilities for crossconnecting any terminal on the left hand side with any one of the 13 bus-bars.
  • the drawing shows 4 conductors first ten bus-bars correspond to the ten digits, y i
  • bus-bars are connected in multiple with the banks of the register switches M4L to VM7, inclusive, and with the bank of the sending switch S1, as is shown in Figs. 6 and 8.
  • the three lower bus-bars are provided for special purposes which will be explained fully later on. 1
  • the sending switch S1, Fig. 8,' and the sequence switch S2, Fig. 9, are rotary switches similar in mechanical construction to the line switch C, Fig. 1, that is, the wipers move in a forward direction only. Each of these switches, however, has a normal or home position in which it stands when at rest.
  • the repeater R3, Fig. 10, is not included in the main layout of the system, but is provided for a special purpose as willI be pointed out hereinafter.
  • the invention is illustrated as applied to what is known as a 10,000,000 line system, that is, one in which each telephone number consists of seven digits 'or other characters.
  • This numbering scheme provides for a maximum of one thousand 10,000 line oflices, which is large enough for the Very largest exchange areas.
  • the first three letters of the exchange names are used in place of a corresponding .number of digits, and are'printed in the directory in capital letters. For example, CARI- tn 2345, or NORth 6789;
  • the letters of the alphabet are, of course, marked on the subscribers dial as well as the ten digits, as shown in Fig.
  • each oiice is provided with first, second, and third selectors for selecting oups of inter-otlice or local trunks, and wit fourth and fifth selectors and connectors for complleting local connections.
  • t code will consist of three digits or series of impulses, which are roduced byV .a suitable Y translation from the nrst three letters of the exchange name, and which serve to actuate the first, second and third selectors at the originating oliice to select an idle trunk in the grou extending to the desired distant office, or a ocal trunk if the called vparty is in the same oirlce. In either case the trunk selected terminates in a fourth selector in the desired oliice, which together with a fifth selector and connector serves to complete the connection.
  • a number of oiiices in a'distant area may have four digit codes assigned, the rst three digits of.
  • the operation now depends upon w ether the test contact 36 with which the test wiper 32 1s in engagement is grounded or not grounduis ed. . If the trunk line shown is busy, the test contact 36 will be'grounded, the switching relay 19 will be short-circuited, and the stepping magnet 2O will beoperated intermit- 120 tently, due to the fact that it interrupts its own circuit, to advance the switch wipers 'y l'step in search of an idle trunk line. Thisoperation is well understood, and it may 'i subscriber removes his receiver .and energizes the line relay 18, the trunkline upon Vwhich the wipers ofthe line switch ⁇ are standingis idle.
  • relay 19 prepares a circuit for the meter Z at armature 22, and at armatures 21 and 24 disconnects the line conductors 12 and 13 from the line relay 18 and from ground, respectively, and extends them by way of wipers and 33, bank contacts 34 and 37, conductors 40 and 42, and armatures 62 and 65 of relay 53 to the upper and lower winding of the line relay 50in the relay group D.
  • this relay When the calling line i.; extended to the line relay 50 as previously explained, this relay is energized and at armature 55 closes a circuit for the slow-acting release relay 51.
  • the electropolarized relay 17 at this time has its lower winding energized by the ground on conductor 41, while its upper winding is in series with the line relay 50. Relay 17 is so adjusted that it will not operate except from the cumulative eil'ect of both of its windings, and since the windings are now in opposition the relay remains inoperative.
  • relay 51 when relay 51 is energized as before described, it removes ground from the test contact 101 at armature 59, and at armature 57 closes a circuit for the starting relay 86 of the finder switch F as follows: from the grounded con- -ductor 41 by way of armature 57 and its Upon energizing, relay 51 connects of the starting relay 86 is completed, the said relay is energized and at armature 114 completes a circuit for the switching rela 85 in series with the stepping magnet 89, whi e at armature 113 the test wiper 91 is connected to the above circuit at a point between the winding of the switching relay and the interrupter contact of the stepping magnet.
  • the finder If the finder is not already in engagement with the set of bank contacts associated with the trunk in use, it will now commence to rotate, but on the assumption that the wipers are in the position shown in the drawing, the test wiper 91 will findr no ground potential on test contact 101, the normal ground connection to this particular test contact having been removed by the energization of relay 51, and no rotation of the switch will take place.
  • the switching relay 85 is immediately energized and at armature 108 completes a locking circuit for itself which extends from ground by way of armature 60 of relay 51, holding conductor 77, bank contact 102, wiper 92, armature 108 and its working contact, the winding of switching relay 85, and the winding of stepping magnet 89 to battery.
  • a bridge is closed across the trunk conductors 82 and 83 extending'to the selector E1, Fig. 2, which may be traced from the upper trunk conductor 82 by way of contacts of relays 54 and 53, conductor 80, bank contact 104, wiper 94, armature 110 and itswork'ing contact, conductor 137, winding of polar relay 375, Fig.
  • relay 401 Upon energizing, relay 401 grounds the release trunk conductor 41 at armature 410, and at arma-to the lower heavy talking conductorl 'by means of a smallcondenser, by means of ture 408 pares a circuitfor the vertical magnet 40g.
  • the polar relay 375 is energized in series with the line relay 400 of the selector E1, and thedirection of current ilow is such. that the armature of the polar relay is operated to close a circuit for relay ,378.
  • rela 378 completes a locking circuit for itsel which extends from ground at the relay group D by way of armature 60, conductor 77, bank contact 102, wiper 92, armature 109 and its 'workingcontact armature 119 and its resting contact, conduct or 135, armature 384 and its resting contact, armature 388'and its working contact, and the winding of relay 378 to battery.
  • Relay 378 also removes the short-circuit from resistance r' at armature 387 and at armature 390 prepares a locking circuit for, relays 376 and 360.
  • ⁇ A branch of the grounded conductor 135l may be traced from junction point 125 by way of the holding conductor 133 toFig. 6, where the release relay 142 of the master digit controller M1 is now energized.
  • Relay 142 removes ground from the releasing conductor' 160 at armature 148at amature 159 separates conductors 398 and 399, and at armature 147 connects up the stepping magnet 163 of the time limit switch M1;
  • This stepping magnet is now intermittently operated under the control of the timer cam T, which makes about one revolution every 5 seconds or more. The operation o f this time limit switch will be neglected for the time being, and itsfunction will be explained fully subsequent to the explanation of the regular circuit connection.
  • the slow-acting relay 140 d'eenergizes and breaks the circuit of slow-acting relay 141.
  • an impulse of current is 'transmitted from ground by way of armature 144 and its resting contact, armature 1 461and its working contact, and the winding of the stepf ping magnet.153 ofthe master digit control switch M1 to battery. Stepping magnet 153 is accordingly actuated to advance the wiper 157 to its second position.
  • a branch of the circuit of magnet 153 may be traced through the windingvof relay 143 to battery, which relay, upon energizing, establishes a lock--4k ing circuit for itself at-armature 150.
  • relay 143 At armature 151 relay 143'disconnects the impulsing circuit from the stepping magnet 155 ⁇ and transfers it by way of wiper 170 and conductor 176 to the Strowger switch H1, Fig. 7, andat armature 149 extends the grounded holding conductor 133 by way of wiper 171 and conductor 17 5 to relay 200 of switch H1.
  • Series relay 201 is energized at the same time as the vertical magnet 214, and maintains its armature 205 attracted in order to preserve the continuity of the impulsing circuit notwithstanding the-shifting of the off-normal springs, which occurs on the rst vertical step. At the end of the vertical movement of the switch relay 201 retracts its armature and transfers the impulsing circuit to the rotary magnet 215.
  • the slow-acting series relay 140 Fig. 6, is energized the same as it -was during the transmission of the rst series, and by cooperation with relay 141 transmits another impulse of current to the stepping magnet 153 of the master digit control switch M1. Wiper 157 is thus advanced to its third position.
  • the calling subscriber may now .dial the third letter R, whereupon the line relay 50 is again caused to deenergize twice, and
  • the stepping magnet 153 of the master digit control switch M1 is operated the same as before to advance the wiper 157 to its fourth position.
  • wiper 15 transfers the impulsing circuit to the stepping magnet 184 of the thousands register switch M4.
  • relay 203 in the 'switch H1 When the relay 203 in the 'switch H1 is energized at the beginning of therotary movement of the switch, it closes a circuit over conductor 231 for the relay 379, Fig. 8. Upon energizing, relay 379 short-circuits the polar relay 375 at armature 386. At the end of the rotary movement of switch H1, when the slow-acting relay 202 falls back, it places ground on conductor 230 by way of armatures 206 and 208. Conductor 230 extends to the sequence switch S2, Fig.
  • the code of the distant office in which the line of stat-ion A1 terminates is 34, as will be perceived from an inspection of Figs. 2 and 3, which show that the trunk line comprising conductors 541 and 542 is accessible from the fourth level of the third group of second selectors in the originatingoice. Accordingly, the second set of contacts in the second level of the fourth Strowger switch H1, which set of contacts is selected by the dialling of the letters CARv of the called number, is so cross connected at the I.D.F. as to cause the transmission of two series of impulses, the irst series comprising three interruptions and the second serles'comprising four interruptions.
  • terminal 257 is cross connected to bus-bar 3
  • terminal 256 is cross connected to bus-bar 4
  • terminals 255 and 254 are cross connected to bus-bars 271 and 270, respectively.
  • Wiper 317 on arriving in' first position, closes a circuit for the impulsing relay- 362 of the sending switch S1 as follows: from the grounded conductor 230, by way of wiper 317 in first position, conductor 340, resting contact of armature 368 and the said armature, winding of relay 362 and the machine interrupter I to battery.
  • the interru ter I is continuously driven, and consists ci) any suitable cam arrangement for intermittently connecting batterrupter tery to the relays such asrelay 362, at thev rate of about ten times per second.
  • the relays such asrelay 362
  • Relay 3 62 also closes a circuit for steppingmagnet 365 at amature 373, and the said magnet is .ener-'- gized.
  • lrelay 376 closes'a ocking'circuit foritself and relay 360 which extends from ground by way of armature 390 and'its working contact, resting contact of armature 385 and said armature; resting. contactof armature 394- and said armature, armature 382- and its workin contact, and the windingsof relays 376 an 360 in parallelto battery.
  • 'Relay 376 also removes the short-circuit rom'the polar relay 375 at amature 381.
  • c Relay 360 on energizing, opens the circuit of the impulsing.
  • relay 362 at armature368, to stop the transmissionof impulses, and in addition, at armature 366, closes an auto f matic stepping circuit for magnet 365, which of switch H1 to wiperv221, which results in the grounding of the No. 4 contact in the bank of the ,stop wiper 364.
  • the ground potential on said contact is established by way of the grounded .wiper 319 in second position, conductor 225, wiper- 221, terminal 256, a
  • the stop relay 360 and the -rom first to second position is the transfer Aof the ground connection from the wiperv 220 ICQ) relay 376 still remain locked up, due to the previously described locking circuit.
  • the latter relay removes the short-circuit from the polar relay 375 at armature 381.
  • the circuit of the line relay 400 is interrupted three tim'es at contact 374 of the impulsing relay 362, and the said line relay accordingly deenergizes three times and at armature 418 transmits three impulses to the vertical magnet 407.
  • the vertical magnet operates to raise the selector shaft step by step until the wipers 420, 421, and 422 reach a position opposite the third level of bank contacts.
  • Slow-acting series relay 402 is energized in serieswitli the vertical magnet 407, maintains its armature 409 attracted throughout the vertical movement of the switch, and as soon as off normal springs 413 close on the first vertical step, completes a circuit for the stepping relay 403.
  • relay 403 closes a locking circuit for itself at armature 411 and at armature 412 prepares a circuit for the rotary magnet 405.
  • the rotary magnet 405 is, therefore, energized and advances the wipers into engagementwith the first set of contacts in the level opposite which they were raised.
  • the rotary magnet breaks the locking circuit of the stepping relay 403, and the stepping relay deenergizes and breaks the circuit of the rotary magnet at armature 412, whereupon the rotary magnet deenergizes also and again closes its interrupter contact.
  • the operation now depends on whether the test contact engaged by the test wiper 421 is grounded or not. ⁇ If the first trunk line terminating in the third level is busy, the test contact associated with such trunk line will have a ground potential on it, the switching relay 404 will be short-circuited, and the stepping relay 403 will be again energized. Relay 403 accordingly again closes the rotary ma gnet circuit which operates to advance the switch wipers another step into engagement with the contacts associated with the next trunk line.
  • the test'wiper 421 When the test'wiper 421 is brought to rest in engagement with test contact 424, it finds no ground potential and it follows, therefore, that on the retraction of the armature of the rotary magnet 405, the stepping relay 403 will not be energized. Instead, the switching relay 404, which .for the time being h as been short-circuited, is energizedA in series with relay 403, the high resistance of relay 404 preventing the latter relay from operating. Onenergizing, relay v404 connects the release trunk conductor 41 to the test wiper 421, thereby grounding test contact 424 and making the selected trunk line busy.
  • relay 404 removes ground from the line relay armature at its armature 414, and at armatures 415 and 417 relay 404 disconnects the incoming trunk conductors 82 and 83 from the windings of the line relay 400 and extends them by way of wipers 420 and 422, bank contacts 423 and 425, trunk conductors 440 and 442, and armatures 456 and 455 to the windings of the line relay 450 of the second selector E2.
  • Line relay 450 is accordingly energized 'and closes a circuit for the slow-acting release relay 451.
  • relay 377 energizes, at its armature 385 it removes ground from armature 382 of relay 376, and since ground is not reapplied to armature 382 until relay 378 has had time to fall back, the locking circuit for relays 376 and 360 is broken long enough to permit the former relay to retract its armature 382,
  • relay 361 will be in energized position, and when relay 377 opens the locking c1r cuit of relays 360 and 376 at armature 385, these relays will be held up over a new circuit extending from ground by way of armature 370 of relay 361, armature 393 and its resting contact, -winding of relay 395, armature 382 and its Working contact, and the windings of relays 360 and 376 in parallel to battery.
  • Relay 395 is at once energized and at armature 394 opens the previous locking circuit.
  • relay 361 opens the circuit of relays 395, 360, and 376 at armature 370, and all these relays deenergize, the original locking circuit being broken at armature 382 before it can be reestablished at armature
  • the second series of code impulses is now transmitted similar to the manner in which the first series was transmitted.
  • the stop relay 360 falls back it completes the circuit for the impulsing relay at armature 368, and this relay is accordingly operated intermittently by the interrupter I to advance the wipers of the sending switch step by step through the medium of the stepping magnet 365.
  • relay 361 is energized, closes the circuit of the stepping magnet 321 of the sequence switch S2 at armature 372, and at armature 371 removes lthe shunt from around the impulsing contact 374, which permits relay 362 to interrupt the circuit of the line relay 450 of the second selector E2 each time it closes the circuit of the stepping magnet 365.
  • the No. 4 contact is now grounded, as previously explained, and relays 360 and 376 are accordingly again energized, a locking circuit being established at armature 382 as before.
  • Relay 360 also breaks the circuit of the impulsing relay 362 at its armature 368, and at armature 366 closes the automatic rotary circuit for the stepping magnet 365, by means of which the sending switch is advanced to normal. Relay 361 then falls back and at armature 372 breaks the circuit of the magnet 321 of sequence switch S2, whereupon the sequence switch wipers are advanced to third position.
  • This circuit causes a momentary energization of magnet 321 to advance the sequence switch wipers to fourth position, whereupon a similar circuit is completed by way of the grounded wiper 319 in fourth position, conductor 227, wiper 223, terminal 254, a jumper connecting said terminal with bus-bar 270, conductor 239, wiper 318 in fourth position, and thence through the interrupter contact and stepping magnet to battery.
  • the stepping magnet is accordingly again energized momentarily to adtions of the stepping magnet 321 take place very rapidly, and thepsequence switch is advanced through its third and fourth positions in a small fraction of a second.
  • the first idle trunk line encountered is the one comprising conductors 500, 501, and 502 extending to the secondary rotary line switch C1, Fig. 3, when the selector wipers arrive at bank cont-acts 463, 464, and 465 the rotation of the switch will cease and the switching relay 454 is energized.
  • the switching relay 454 connects the release trunk conductor 441 to the test wiper 461 in order to make the selected trunk line busy; and at its armatures 456 and 45-5 the switching relay 454 disconnects the trunk conductors 440 and 442 from the windings of the line relay 450, and extends them by way of wipers 460 and 462, bank contacts 463 and 465, trunk conductors 500 and 502, and armatures 508 and 511 of relay 503 of the line switch C1 to the winding of the line relay 504 and to ground, respeetively.
  • the line relay 504 When the connection is extended to the line switch C1 as previously described, the line relay 504 is energized and at armature 507 connects ground to the release trunk conductor 501. This operation serves to maintain a local ground on the test contact 464 after the slow-acting relay 451 of the selector E2 has fallen back.
  • the line relay 504 also closes a circuit for the switching relay 503 in series with the stepping magnet 512 at armature 506, while at armature 505 it connects the test wiper 521 to the circuit of the switching relay at a point between said relay and the interrupter Contact of the stepping magnet. If the wipers of the line switch are standing on a busy trunk line, the switch now operates in the well-known manner to advance its wipers through the medium of the stepping magnet 512 to an idle trunk line,
  • the switching relay 503 is immediately energized, and at its armatures 509 and 5l() connects the incoming release trunk conductor 501 with the test wiper 521 in order to make the selected trunk line busy by grounding the test contact 524.
  • the test wiper is disconnected from the test circuit at the resting contact of armature 510.
  • the switching relay disconnects the incoming trunk conductors 500 and .502 from .the line relay 504 and from ground, respectively, and extends them by way of wipers 520 and 522, bank contacts 523 and 525, trunk conductors 526 and 528, left hand windings of the repeating coil in the repeater R, and contact springs of the reversing relay 534 to the lower and upper windings of the line relay 535 of the said repeater, respectively.
  • the line relay 535 is energized and completes a circuit for the slow-acting release relay 536 at armature 538.
  • relay 536 places ground on the release trunk conductor 527 at armature 540, and thus establishes a holding circuit which includes release trunk conductors 527, 501, 441, and 41.
  • This holdingcircuit is still grounded at armature 56 of relay 51 in the relay group D, Fig. 1,but the ground at this point is only temporary as will appear subsequently, and after the use of the director is dispensed with the ground at the repeater R will serve to maintain all of the various switches so far considered in operated position.
  • the line relay 535 of the repeater R When the line relay 535 of the repeater R is energized, it also connects the right hand windings of the repeating coil in bridge of the trunk conductors 541 and-542 at armature
  • the trunk line comprising conductors 541 and 542 extends to the distant office in which the wanted station A1 is located, and there terminates in the incoming third selector E, .F ig. 4.
  • the line relay 600 of the third selector E3 is energized and completes a circuit for the slow-acting release relay 601, which accordingly operates and prepares the switch for its vertical movement in the usual manner.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US538551A 1922-02-23 1922-02-23 Automatic telephone system Expired - Lifetime US1811146A (en)

Priority Applications (19)

Application Number Priority Date Filing Date Title
FR568149D FR568149A (fr) 1922-02-23 1922-01-17 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
US538551A US1811146A (en) 1922-02-23 1922-02-23 Automatic telephone system
GB6905/22A GB193694A (en) 1922-02-23 1922-03-08 Improvements in or relating to telephone systems
US54786622 US1702392A (en) 1922-02-23 1922-03-29 Automatic telephone system
GB11287/22A GB194580A (en) 1922-02-23 1922-04-21 Improvements in or relating to telephone systems
DEA38438D DE551234C (de) 1922-02-23 1922-09-14 Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb und Stromstossspeichern
FR27010D FR27010E (fr) 1922-02-23 1922-10-17 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
FR27031D FR27031E (fr) 1922-02-23 1922-10-30 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
FR27030D FR27030E (fr) 1922-02-23 1922-10-30 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
US60727022 US1646262A (en) 1922-02-23 1922-12-16 schwartz
FR27949D FR27949E (zh) 1922-02-23 1923-07-04
FR28100D FR28100E (fr) 1922-02-23 1923-07-05 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
GB19481/23A GB208509A (en) 1922-02-23 1923-07-30 Improvements in or relating to telephone systems
FR28470D FR28470E (fr) 1922-02-23 1923-12-04 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
FR30529D FR30529E (fr) 1922-02-23 1923-12-28 Système téléphonique à grand réseau, avec traducteur et dispositif de contrôle
GB6423/24A GB220923A (en) 1922-02-23 1924-03-12 Improvements in or relating to telephone systems
GB5658/25A GB230104A (en) 1922-02-23 1924-03-12 Improvements in or relating to telephone systems
FR31050D FR31050E (fr) 1922-02-23 1924-08-22 Système téléphonique automatique pour grand réseau, avec traducteur et dispositif de contrôle
US297609A US1691410A (en) 1922-02-23 1928-08-06 Automatic telephone system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US538551A US1811146A (en) 1922-02-23 1922-02-23 Automatic telephone system
US208509XA 1922-12-16 1922-12-16
US659304A US1683857A (en) 1923-08-25 1923-08-25 Automatic telephone system
US297609A US1691410A (en) 1922-02-23 1928-08-06 Automatic telephone system

Publications (1)

Publication Number Publication Date
US1811146A true US1811146A (en) 1931-06-23

Family

ID=31950752

Family Applications (4)

Application Number Title Priority Date Filing Date
US538551A Expired - Lifetime US1811146A (en) 1922-02-23 1922-02-23 Automatic telephone system
US54786622 Expired - Lifetime US1702392A (en) 1922-02-23 1922-03-29 Automatic telephone system
US60727022 Expired - Lifetime US1646262A (en) 1922-02-23 1922-12-16 schwartz
US297609A Expired - Lifetime US1691410A (en) 1922-02-23 1928-08-06 Automatic telephone system

Family Applications After (3)

Application Number Title Priority Date Filing Date
US54786622 Expired - Lifetime US1702392A (en) 1922-02-23 1922-03-29 Automatic telephone system
US60727022 Expired - Lifetime US1646262A (en) 1922-02-23 1922-12-16 schwartz
US297609A Expired - Lifetime US1691410A (en) 1922-02-23 1928-08-06 Automatic telephone system

Country Status (4)

Country Link
US (4) US1811146A (zh)
DE (1) DE551234C (zh)
FR (9) FR568149A (zh)
GB (5) GB193694A (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542800A (en) * 1948-10-29 1951-02-20 Bell Telephone Labor Inc Variable timed release for registers controlled by register group busy means
US2620399A (en) * 1948-06-29 1952-12-02 Bell Telephone Labor Inc Telephone switching system employing repetitive impulsing
US2678353A (en) * 1949-02-12 1954-05-11 Automatic Elect Lab Telephone system
US2680781A (en) * 1949-11-08 1954-06-08 Bell Telephone Labor Inc Translating arrangement

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB516416A (en) * 1938-06-14 1940-01-01 Ass Telephone & Telegraph Co Improvements in or relating to automatic or semi-automatic telephone systems
US2554115A (en) * 1947-12-08 1951-05-22 Automatic Elect Lab Automatic director telephone system
US2633497A (en) * 1948-04-05 1953-03-31 Standard Telephones Cables Ltd Telephone switching system with selection of local or trunk lines
US2604539A (en) * 1948-04-05 1952-07-22 Standard Telephones Cables Ltd Automatic telephone switching system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620399A (en) * 1948-06-29 1952-12-02 Bell Telephone Labor Inc Telephone switching system employing repetitive impulsing
US2542800A (en) * 1948-10-29 1951-02-20 Bell Telephone Labor Inc Variable timed release for registers controlled by register group busy means
US2678353A (en) * 1949-02-12 1954-05-11 Automatic Elect Lab Telephone system
US2680781A (en) * 1949-11-08 1954-06-08 Bell Telephone Labor Inc Translating arrangement

Also Published As

Publication number Publication date
FR27030E (fr) 1924-03-26
GB193694A (en) 1923-03-01
FR30529E (fr) 1926-07-18
FR568149A (fr) 1924-03-17
FR28100E (fr) 1925-01-14
FR27949E (zh) 1924-09-27
GB220923A (en) 1925-06-12
US1702392A (en) 1929-02-19
FR31050E (fr) 1926-11-20
FR28470E (fr) 1925-02-27
GB230104A (en) 1925-05-21
GB194580A (en) 1923-03-15
FR27010E (fr) 1924-03-26
DE551234C (de) 1932-05-31
GB208509A (en) 1924-10-30
US1646262A (en) 1927-10-18
US1691410A (en) 1928-11-13
FR27031E (fr) 1924-03-26

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