US1614678A - nelson - Google Patents

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US1614678A
US1614678A US1614678DA US1614678A US 1614678 A US1614678 A US 1614678A US 1614678D A US1614678D A US 1614678DA US 1614678 A US1614678 A US 1614678A
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relay
circuit
digit
conductor
switch
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    • 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

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  • MARTIN LFNELSON 0F PARK RIDGE, ILLIHOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO AUTOMATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELA- WARE.
  • An essential feature of the invention is the B operators sending equipment at the automatic exchange.
  • This apparatus includes a novel sending switch, and a plurality oi't' relay storage devices of new design, together with circuits whereby the digits, corresponding to successively actuated digit keys, are registered on the storage devices, whereby the storage devices successively control the sending switch according to the registered digits, and whereby the entire apparatus is automatically disassoci-' ated from the trunk line in use when the connection iscompleted.
  • Figs. 1, 2, 3, and d of the drawings should be laid out in order with corresponding lines at the ends thereof in alignment, while Figs. 5, 6, and 7 should be similarly laid out immediately below Figs. 2, 8,- and 4:, respectively.
  • Thedrawingswhen thus arranged show an inter-othcetrunk line connecting a'manual exchange with an automatic exchange, and the associated equipment required to mechanical lish a connection between two subscribers lines such, for example, as the line of the manual sub station A, Fig. 1, and the line of the automatic sub station A, Fig. 4.
  • the connection when established, involves a manual cord circuit such as the cord circuit 0, Fig.
  • FIG. 1 an inter-office trunk line, manual to automatic, and associated trunk equipment, shown in Fig. 2; a first selector switch D, Fig. 3; a second selector switch such as the second selector E; and a final connector switch such as the connector H, Fig. 4.
  • the apparatus shown in Figs. 5, 6, and 7 constitutes a B operators sender which is used to control the setting of the automatic switches, and which may be temporarily associated with the trunk line for this purpose.
  • Fig. 8 shows a lamp indicating de-.' vice associated with the sender shown: in Figs. 5, 6, and 7.
  • the equipment shown in Fig. 1 comprising the telephone station A and the associated line equipment atthe exchange, the operators cord circuit 0, andthe A operators head set, is all manual equipment-of wellknown type and on this account will not have to be described.
  • the inter-foffice trunk line comprising conductors and 31, is one of a large group of similar trunk lines and extends from the jack J in the outgoing trunk multiple at the A board, in the manual exchange, by way of the B operators position, shown in Fig. 2, to the first selector D, which is shown in Fig. 3.
  • the trunk line is normally open and is provided with a group of relays, whose circuits are shown in full, and whose operation will also be described in the course ofthe general explanation.
  • a call circuit, or order, Wire circuit which terminates in the B operators head set at the automatic exchange, and which is multipled in the call circuit keys at the A board in the manual exchange.
  • the first and second selectors D and E are automatic switches of the well known Strowger vertical and rotary type, such as are in common use in numerous automatic telephone exchanges throughout the country.
  • the connector H is likewise a St-rowger vertical and rotary switch and is similar in construction to the selector switches I) and E.
  • the circuits are arranged, ho ever, for a directive control in lower lefthand corner of Fig. 2, a sending switch indicated by the'reference character S, and including a plurality of associated relays, all of which are shown in Fig. 5, a firstdigit storage device, shown in 6, a second digit storage device, shown in Fig. 7, and third and fourth digit storage devices, which are not shown but are in all respects exactly like the second digit storage device which is shown in Fig. 7. There is also a lamp indicating device, shown in 8 on the same sheet with Fig. 2.
  • the digitkeys are ordinary self restoring keys, or push buttons, located-in a single row in front of the B operator, and control the setting of the storage devices. There is also a release key R and a lamp L located in the same row with the digit keys.
  • the sending switch S in Fig. 5, is a simple rotary switch having two horizontal rows of bank contacts and the two wipers 207 and 208 a ciated therewith. These wipers are adapted to be driven by any suitable form of ratchet mechanism in a forward direction onlyby means of the stepping magnet 205.
  • the cam 298 is mounted on a constantly rotating shaft which is driven by a small motor, or other suitable means, at a speed of about'ten revolutions per sec 0nd: This is the impulse sending cam and -may be common to a number of diiferent senders.
  • the first digit storage device shown in Fig. 6, comprises the digit relays 271-270, inclusive, and the live relays 250*25-t, inclusive.
  • the other storage devices are very similar tothe first digit storage device, and
  • any sender may be connected with any inter-ofiice trunk line.
  • the local trunk line associated with the sender shown in the drawings comprises conductors 221-224, inclusive, which conductors are connected .in multiple to contacts of relays, such as the relay 45, associated with the several inter-officetrunk lines. AL though none of the other senders are shown, the local trunk line associated with the sec-- 0nd sender is shown in the drawing at thef right of Fig. 2, and comprises conductors 221' to 224, inclusive.
  • the local trunk lines associated with the other two sendtfrs are similar to the one shown and, therefore, it is believed that the arrangements will be readily understoodIwithout further explanation.
  • the lamp indicating device shown inFig. 8, is individual to the sender illustrated, and there is a similar indicating device for each of the other senders.
  • This indicating device comprises a plurality of banks of switch-board lamps, there being a lamp in each bankfor. each of the ten digits.
  • the number of different. banks of lamps will, of course, depend upon the number of digitsin the telephone numbers; for four digit numbers four banks of lamps will, of course,
  • first digit bank are connected to springs of relays 271-270, inclusive, the conductors, such as conductor 335, coming from the lamps of the second. digit bank are connected to contacts of relays '32l-'320, inelusive, of the second digit storage device, while the conductors coming from the lamps in the third and fourth digit banks are similarly connected to the contacts ofihe digit relays in the third and fourth storage
  • the operation of the system in establish- 7 ing a telephone connection will now bG-GX plained, it being assumed for this purpose that the subscriber at sub station A in the manual exchange desires to obtain connection with the subscriber at sub station A in the automatic exchange.
  • the telephone number at sub station A will be assumed as No. 4567.
  • the supervisory lamp L would be lighted at the same time were it not or the fact that the receiver is off at sub station A, whose transmitter is now supplied with current from the cord circuit. As a result, the supervisory relay 8 in the ring side of the cord circuit is energized and shunts out the lamp L to prevent it from being lighted. V
  • the A operator will now throw her key K to listening position in order to obtain from the calling subscriber the number of the party with whom he desires to converse. Having ascertained that the desired number is the No.4567 in the automatic office, the operator will restore her listening key and will depress the proper. call circuit button in order to connect her head set with the call circuit extending to the desired oflice, or exchange.
  • the call circuit button at this particular A operators position which is associated with the particular automatic exchange in question, is the button P, and when this is depressed the A operators head set is connected directly with the B operators head set in the automatic ofiice. The A operatornow repeats the No.
  • trunk multiple Assuming that the trunk line comprising conductors 30 and 31 is the trunk line assigned, the plug will be inserted in the jack J" and a circuit is immediately completed over the two sides of the trunk line in series for the bridged relay 40 at the B operators position. Relay 40 is energizedbycurrent flowing from the cord circuit at the A board and closes a,
  • the .B operator having actuated the trunk key K, has doneall that is required of her toward the establishment of the connection and need pay no further attention to it.
  • the sender upon which the number has been registered, controls the automatic switches without any further attention, and when the last switch has been operated the sender is automatically disassociated from the trunk line and is ready for use in registering ancircuit is completed over conductor 234 for the fourth digit relay 274.
  • relay 274 Upon energizing, relay 274 prepares a locking circuit for itself at armature 281; connects the grounded conductor 228 to conductor 284 which extends to the No.
  • Relay 252 is accordingly energized in series with relay 274, having been prevented from energizing before by the short-circuiting ground on conductor 234 and at its arma ture 258 closes a circuit for relays 253 and 254 in series, which, upon energizing, disconnect all of the digit relays, 271270, inclusive, from the conductors coming from the digit keys.
  • Relay 274 of course, remains energized over its locking circuit.
  • Relay 252 also connects ground to the hold ing conductor .223 at armature 260, and at armature 259 connects ground to conductor 285 extending to the second digit storage device, :Fig. 7, thus completing a circuit for rela s-304-and 305 in series.
  • relay 325 prepares a locking circult for itself at 1ts armature 331, con-' nects the grounded conductor 228 to the lamp conductor 335 at armature 333, thereby displaying the No.5 digit in the second digit bank of the lamp indicating device, and connects conductor 388 to conductor 265 at armature 332.
  • the latterconductor extends to the lower bank of the sending switch S and terminates there inbank contact 295.
  • ground is removed from conductor 235 and relay 325 becomes locked in series with relay 303 over conductor 285.
  • Relay 303 is accordingly energized in series with relay 325 and at its armature 312 breaksthe circuit of re lays 304 and 305, whereupon these relays fall back and disconnect the digit relays 321320, inclusive, from the conductors coming from the digit keys.
  • Relay 303 also grounds the holding conductor 223 at its armature 311, and at its armature 310 grounds the conductor 385 which extends to the third digit storage device, thereby completing a circuit for the relays, corresponding to relays 304 and 305, which connect the ten digit relays of the third digit storage device with the conductors coming from the digit keys.
  • the operations which take place at the fourth digit storage device are similarto those described in the case of the'other storage devices.
  • the No. 7 digit relay is energized over conductor 237, and this-relay causesthe digit 7 to the displayed at the fourth digit bank of the lamp indicatingdevice and also prepares a circuit. for grounding conductor 267, "which conductor terminates in bank contact 297 of the sending switch S. After the N o.
  • the energized digit relay becomes locked in series with a relay, corresponding to relay 303, which is energized in order to ground the holding conductor 223 and also to break the circuit of the relays which have previously been effective to connect the ten digit relays ofthe fourth digit storage device with the conductors coming from the digitkeys.
  • the pilot lamp L which is located in line with the digit keys of the sender, upon which the number has just been registered, is also lighted inasmuch as it is connected with the grounded holding conductor 223.
  • a key may be inserted in the battery conductor in order to disconnect the current supply from the lamps, and the key may then be operated whenever it is desired to show up some particular number.
  • the release key It may be actuated in order to energize relay 203 for the purpose of restoring the digit relays of the several storage devices to normal position. The manner in which this is accomplished by the operation of relay 203 will be clear from the subsequent explanation of the restoration of these relays under ordinary circumstances, consequently it will not be necessary to make any detailed explanation of it at this time.
  • the B operator assigns a trunk to the A operator, as previously explained, and as soon as the A operator has taken the trunk, as indicated by the lighting of the busy lamp L the B operator will actuate the trunk key K.
  • a circuit is completed for the upper winding of relay by Upon energizing, relay 45 looks itself to the grounded holding conductor 223 at its armature 52, closes a circuit for the upper winding of relay 44 at armature 51, and at armatures and 53 connects the trunk conductors and 6-1 with the conductors 221 and 222 coming from the sending switch S, Fig. 5.
  • Conductors 221 and 222 are normally connected together at armature 212 and also at armature 214 of relays 201 and 202 of the sending switch S, and it follows, therefore, that a circuit is completed over the trunk conductors 60' and 61 for the line relay 65 of thefirst selector D, Fig. '
  • relay 65 closes a circuit for the slow acting release relay 66.
  • the latter relay upon'energizing, opens a pointin the circuit of the release magnet 72 and prepares a circuit for the vertical magnet in the customary manner.
  • Relay 44 is operated when the circuit is closed through its upper winding and completes a locking circuit for itself at its armature 48.
  • relay 44 closes a pair of contacts in the trunk conductors in order that when the relay 45 deenergizes, as will occur shortly, the said trunk line may extend continuously through the operators position.
  • relay 45 is energized, as just explained, the conductor 224 is grounded, being connected with conductor 223 at armature 52, and a circuit is completed for slow acting relay 204, Fig. 5.
  • relay 204 closes a circuit for slow acting relay 205 at its armature 217 and at its armature 218 disconnects ground from the conductor 228.
  • the impulsing relay 202 continues to be energized and deenergized intermittently by the operation of the cam 298, and at each energization this relay will separate the two conductors 221 and 222 and will thereby produce a series of. interruptions in the circuit of the line relay 65 of the selector D.
  • relay 202 transmits a series of impulses to the stepping magnet 206 at armature 215, and. the sending switch S is thus driven synchronously withithe first selector.
  • the stepping magnet 206 willhave been energized four more times, and the wiper 208 willbeadvanced into engagement with the now grounded bank contact 294.
  • a circuit is thus completed for the slow acting relay 200, which immediately energizes, establishes alocking circuit for itself at its armature 210, and'at its armature 211 opens the circuit of'the impulsing relay 202,
  • the saidstepping magnet will operate in the manner ofa buzzer and the switch will be advanced automatically until wiper 207 arrives at the first ungrounded' contact in its bank which, as shown in thedrawing, is the twelfth bank contact. During this time certain operations are taking place at the first digit storage device which will now be explained.
  • relay 251- will become lockedin operated position over a circuit which includes relay 250 and the grounded conductor 226.
  • Relay 250 is, therefore, energized with the result that conductor: 227 is disconnected from relay 251 and is transferred by way of conductor 287 to the corresponding relay 302 ofthe second digit. storage device.
  • Further results ofthe energization of relay 250 are the opening of the ground connection at armature 257 to the holding conductor 223 in the first digit storage device (it will be recollected that this holding conductor is still grounded in each of the'other three storage devices) the removal of ground from conductor 288, at.
  • the slow acting relay 200 also deenergizes after a. brief instant and at its armature 211 againcloses the circuit. of the impulsing relay 202.
  • This relay now begins operating as before and on I its first energization transmits an impulse of current to the stepping magnet 206w-ithout, however, interrupting the switch control circuit over the trunkline, which nowex.- tends through to the second selector E.
  • wiper 207 arrives at the thirteenth bank contact and since this contact is grounded? a circuit is completed for the slow acting relay 201 which operates to open the shunt circuit at itsarmature 212 as before.
  • Subsequent energizationsof the impulsing relay 202 now cause the control circuit extendingto the selector E to be interrupted" a plurality of times, while at the same time the stepping magnet 206 is intermittently energized" to drive the wipers of the sending switch.
  • wiper 208 arrives at the eighteenth contact in its associated bank, which contact is connected in multiple with the bank con? tact 295, a circuit will be completed for relay 200, and this relay is energized as before to open the circuit of the impulsingreuntil the wiper 207 arrivesatthe nextun grounded bank contact,.which is the twenty- V fifth.
  • relay 200 is energized, a circuit is completed.
  • relay 302 in the second digit storage device and the said re- My 302 is energized.
  • this circuit is broken and relay 302 becomes locked in series with relay 301 to the grounded conductor 285.
  • Relay 301 is accordingly energized and at its armature 306 disconnects conductor 287 from the winding of relay 302 and transfers it by way of conductor 387 to a similar relay in the third digit. storage device.
  • relay 301 disconnects the grounded conductor 286 from conductor 388, thereby removing ground from the bank contact 295 in the bank of the sending switch S, and transfers it into connection with conductor 386, whereby ground is extended by way of the now energized sixth digit relay in the third digit storage device, to bank contact 296 in the bank of the sending switch, and at armature 308 of relay 301 the ground conncction to the holding conductor 223 in the second digit storage device is broken.
  • the second series of operations at the operators sending equipment resulted in the transmission of five impulses to the selector E, or rather in the production of five int-erruptions in the circuit of its line relay 90, whereby the switch shaft and wipers are raised opposite the fifth level of bank contacts.
  • the second selector E automatically operates to select an idle trunk leading to a connector switch, such as the connector H, Fig. 4.
  • the third series is terminated by the arrival of wiper 208 at grounded bank contact 296 which causes relay 200 to be energized, inorder to advance the sending switch automatically to the twelfth contact in its bank, and which closes a circu'it over conductors 227, 287 and 387 to the relay in the third digit storagedevice which correspondsto relay 302 of the second digit storage device.
  • a relay in the third digit storage device corresponding to relay 301 of the second digit storage device, is energized and various transfer operations take place which result in the removal of ground from bank contact 296 and in the grounding of bank contact 297.
  • the connector l-ll responds to the third series ofgimpulsesyand its shaft and wipers are raised five steps until they stand opposite the fifth level of bank contacts. No automatic movement takes place at the connector, however, upon the cessation of the series of impulses and further movement of the connector is deferred until-the arrival of the next series of impulses.
  • conductor 227 is grounded, and a circuit is completed over said conductor and conductors 287 and 387 and thence by way of a similar conductor, in the third digit storage device, to a relay in the fourth digit storage device, which corresponds to relay 302 of the second digit storage device.
  • a transfer relay in the fourth digit storage device which corresponds to transfer relay 801 of the second digit storage device, is energized.
  • the fourth digit storage device is the last one, it will be apparent that those conductors, corresponding to conductors 365,
  • relays 250, 251, 252, and 274 of the first digit storage device are deenergized.
  • Relay 252 upon deenergizing, opens the circuit of relays 253 and 254 which are thus deenergized also, and also removes ground from conductor 285 at armature 259.
  • relays 301, 302, 303, and 325 of the second digit storage device are deenergized.
  • Relay 3023 upon deenergizing, removes ground from conductor 385 extending to. the third digit storage device, and as a result the corresponding relays in this storage device are deenergized also.
  • the relays in the fourth digit storage device which have beenlocked up, are deenergized an instant later.
  • The'operators sending equipment including the four digit storage. devices and the sending switch S, is thus entirely restored to normal positionv and is ready for use again in registering another telephone number.
  • the control circuit of'the first selector 1) includes the conductors 221 and'222 coming from the sending switch S, and the trunk conductors 60 and 61, and when'the first series of interruptions is produced in this circuit by the intermittent impulsingrelay 2020f the said sending switch, the line relay 65 of the first selector is caused. to retract its armature a corresponding plurality of times.
  • relay 65 sends a current impulse through the slow acting series relay 67 and the vertical magnet 70 in series, and the vertical magnet is operated to raise the switch shaft step by step until the wipers 80, 81., and 82 stand opposite the fourth level of. bank contacts Relay- 67 is energized in series with the'vertical magnet, and being slow acting retains its armature in operated position. throughout the vertical movement of the switch.
  • the off normal springs 7 8 are closed and since relay 67 is in operated position a circuit is completed for the stepping relay 68.
  • relay 68 Upon energizmg, relay 68 establishes a locking circuit for itself at its upper. armature, and at its lower armature prepares a circuit for the rotary magnet 71.
  • the slow acting relay 67 is deenerupon deenergizes also and again closes its interrupter contact. .
  • the operation now depends upon whether the trunk line terminating in the first set of contacts is busy or idle. If this trunk line is busy, .there will be a ground potential on the test contact engaged by the test wiper '81 and the stepping relay 68 will again be energized, resulting in another closure of the rotary magnet circuit and the advance of the switch wipers into engagement with the second set ofbank contacts, and this operation will continue as long'asthe test wiper 81 continues to engage grounded test contacts.
  • the test wiper 81 When the first idle iiitrunk line is reached, which we will assume to be the trunk line extending to the second selector .E, the test wiper 81 will find no ground potential on the test contact 84- and the stepping relay 68 will not again be operated. Instead, the switching relay 69, which has heretofore been short circuited, is energized in series with the stepping relay grounds the test wiper 81 at its armature 7 5 inorder to make the selected trunk line busy, and at its armatures 74 and 77 disconnects the trunk conductors and 61 from tacts 83 and 85, conductors 86 and 88, and
  • the line relay 90 When the trunk conductors are extended to the selector E, as above described, the line relay 90 is ener ized and closes a circuit tor the slow acting release relay 91. Upon energizing, relay 91 prepares the selector for operation in its vertical movement in the usual manner, and also connects ground to the release trunk conductor 87, thereby establishing a holding circuit which extends by way of said conductor 87, test contact 8 1, test wiper 81, armature and its working. contact, winding of the switching relay 69, interrupter contacts of the rotary magnet 71, off normal'springs 7 8, and the winding of the stepping relay 68 to battery.
  • trunk conductors 60 and 61 have been extended through to the second selector E have occurred in response to the transmission of the first series of impulses by the sending switch S.
  • the automatic rotary movement ot the selector D in selecting an idle trunk line. in the particular level, which.
  • the line relay of the second selector E is deenergized a plurality of times and controls the vertical magnet 92 to raise the shaft and wipers 100402, inclusive, to the'fifth level, the second digit in the number being the digit 5, as explained heretofore.
  • the operation of the second select r E is precisely the same as that of the first selector D, and consequently it will be unnecessary to consider it in detail, It will be sufficient to say that at the end of the .vertical movement of the switch, the rotary movement is initiated automatically and the wipers are rotated step by step in search of an idle trunk line leading to a connector switch.
  • the line relay 111 is energized and completes a circuit for the slow acting release relay 112.
  • relay 112 prepares the connector for operation in its vertical movement in the usual way and at armature connects ground to the release trunk conductor 107.
  • a holding circuit is thus established which extends by way of the said conductor 107.
  • the switching relay 99 at the second selector E is connected to the holding circuit the same as was described in the case of the switching relay 69 of the first selector.
  • Relay 113 is energized in series with the vertical magnet 118 and being slow acting holds'up continuously during the vertical operation of the switch.
  • this relay By the operation of this relay; the vertical magnet circuit is preserved intact, notwithstanding the shifting of the off normal ire rotary magnet 119 over the following circuit: From ground by way of armature 124: and its resting contact, armature 126 and its working contact, off normal springs 121 and 122, armature 127 and its resting contact, resting contact of armature and the said armature, armlature 139 and its resting contact, and the winding of the rotary magnet 119 to the battery.
  • the wipers 150 152 are rotated step by step and are finally brought to rest in engagement with the particular set of bank contacts in which the line ofsubstation A is terminated, these contacts being indicated in the drawings by reference characters 156,1541 and 155.
  • the slow acting relay 116 is energized in parallel with the rotary magnet and remains continuouslyenergi-zed during the rotary movement.- In operated position, relay 116 connects' the test wiper 151 to the winding ot the test relay 115 by means of its armature and at armature 185 closes an alternative point in the circuit of the rotary magnet, to guard against the possibility of having this circuit opened by the operation of the testrelay while the test Wiper 151 is passing over grounded test contacts.
  • the subscriber On perceiving the signal, the subscriber will replace his receiver thereby signailing the operator who will pull down the completed for the switching relay 117 which may be traced from the grounded conductor 107 by way of armature 131 and its resting contact, the upper winding of the switching relay 117, resting contact of armature 183 and the said armature, test wiper 151, test contact 1541-, winding of the cut off or switching relay 162 of the line switchC, and winding of the stepping magnet 164 to battery.
  • Relays 117 and 162 are energized in series over this circuit, and the latter relay effective to clear the line conductors 160 and 161 of their normal. battery and ground connections in the line switch. It may be explained that owing to a mechanical inter-locking device between the arniatures of the switching relay 162 and the line relay 163, the former relay is operated only about half way at this time, and the wipers of the line switch are not connected up.
  • the switching relay 117 pulls up, it establishes a locking circuit for itself at arn'iature 138, grounds the test wiper 151 at armature 137, opens the rotary magnet circuit at armature 139,
  • armatures 136 and 1410 connects up the two line wipers 150 and 152.
  • a signalling circuit is established whereby ringing current from the generator GEN is interi'nittently projected out over the called line to operate the bridged ringer at substation A, and notify the called subscriber that he is wanted.
  • the return path for the ringing current includes the upper winding of the ring cut off relay 114, and when the called subscribe-r answers this relay is operated.
  • relay 114 Upon energizing, relay 114 establishes a locking circuit for itself at its armature 129. breaks the ringing circuit at arrnatures 128 and 130, and at the working contacts of these same armatures finally completes the talking connection.
  • This relay is a reversing relay and hasthe well known function of reversing the incoming trunk conductors 106 and 108 as regards their connections with the windings of the line relay 111. It will be recalled now that the circuit of the line relay 11.1 is completed by way of the bridge through the impedance coil 43, and the upper winding of.
  • the two windings of this relay now co-operate and it is able to attract its armature whereby the upper high resistance Winding of relay a is shunted by means of the relatively low resistance impedance coil 41.
  • Relay 40 remains energized, owing to the fact that its lower winding is still connected in the bridge across conductors and 31, and the result of shunting out the upper high resistance winding of this relay is to augment the flow of current sufiiciently to operate the supervisory relay 7 at theoperators cord circuit in the manual exchange. This serves to extinguish the supervisory lamp L and notifies the operator that the called subscriber in the automatic exchange has answered his telephone. The subscribers may now converse as desired.
  • the supervisory relay 8 When the subscribers are through talking, they will replace their receivers. By the replacement of the receiver at substation A, the supervisory relay 8 is deenergized, and the supervisory lamp L is lighted.
  • the back bridge relay 110 in the connector H When the subscriber at substation A replaces his receiver, the back bridge relay 110 in the connector H is deenergized and the direction of current flow in the section of the trunk tot-he right of the condensers is reversed to normal, thereby causing the electropolarized relay 42 to retract its armature.
  • the upper high resistance winding of relay is again included in the circuit of the supervisory relay 7 at the A operators cord circuit, and this relay is deenergized to light the supervisory lamp L
  • the disconnect signals thus given the operator, she is advised that the conversation is finished and she will accordingly pull down the connection.
  • relay 44 opens the trunk line at armatures 17 and i9, thereby clearing the bridge across the trunk conductors and (31.
  • the line and release relays 111 and 112 of the connector H are permitted to fall back and these relays jointly close a circuit for the release magnet 120, whereby the connector H is restored to normal in the usual manner.
  • Relay 112 also removes ground from the relase trunk conductor 107 and this operation breaks the holding circuit for the switching relays 69 and 99 of the selectors D and E, respectively. These relays are, therefore, deenergized and circuits are completed for release magnets 7 2 and 93 which operate to restore their associated switches to normal position. All the apparatus is thus returned to normal and is ready for use in setting up other connections.
  • a and B operators positions trunk lines coming from the A operators position and passing through the B OfjQIltOfiS position to automatic switches, other automatic switches, means for manually connecting a calling line with one of said trunk lines at the A operators position, an operators sender at the B position comprising a progressively movable sending switch and a plurality of storage devices, said sending switch including a contact device, means whereby the B operator can register the digits in the number of the called line on said devices, means for connecting the sender with the trunk line in use, means whereby the sending switch is then controlled by said storage devices successively 'to-t ansmit series of impulses over the trunk conductors by means of said contact device to operate a series of said switches: to connect with the called line, and means for automatically disconnecting the sender when the connection is completed.
  • a and B operators positions, trunk lines coming from the A operators position and passing through the B operators position to automatic switches, other automatic switches, a call circuit extending between said positions whereby the A operator can transmit a desired ca led number to the B operator, an operators sender at the B position comprising a progressively movable sending switch and a plurality of storage devices, said sending switch including an interrupter, means whereby the B operator can register the digits in the called number on said. devices, u'ianual means at the A operators'position for connecting a calling line with a" particular one of said trunk lines assigned by the li operator over said call circuit, means whereby the B operator can connect said sender with the trunk line assigned, and
  • a set of digit keys one for each digit, a plurality of storage devices each comprising a set of digit relays, one relay for each digit, means where by the successive actuation of a plurality of digit keys causes the energization of a particular digit relay in each of said storage devices, an impulse sending mechanism, and means for placing said mechanism under control of said storage devices successively.
  • a set of digit keys a plurality of storage devices each comprising a. set of digit relays, the cligitrelays of the first device being normally connected with said keys, and transfer relays and circuits effective to disconnect the digit relays of one device from said keys and to connectthe digit relays of another device whenever a digit key is operated and released.
  • a plurality of storage devices each comprising a set of digit relays, the number of said storage devices being equal to the number of digits in the telephone numbers, a common set of digit keys, and a transfer relay in each storage device except the last for shifting the control of said keys from one storage device to the next.
  • a plurality of storage devices each comprising a set of digit relays, a common set of digit keys, a transfer relay in each storage device for shifting the control of said keys from one storage device to the next, means for energizing a digit relay in one of said devices when a digit key i-sactuated, and means for energizing the transfer relay in said device when the actuated digit key is restored.
  • a plurality of storage devices each comprising a set of digit relays, a common set of digit keys, a transfer relay in each storage device for shifting the control of said keys from one storage device to the next, means for energizing a digit relay in one of said devices when a digit key is actuated, a self locking circuit for the energized digit relay including the associated transfer relay, and circuit connections such that current flow through said transfer relay is delayed until the actuated digit key is restored.
  • a trunk line terminating in an automatic switch, other switches, an operators sender comprising a plurality of storage devices, means for registering a digit in a called number on each of said devices, a holding conductor, means for grounding said conductor at each storage device when a digit is registered, an impulse transmitting mechanism, a trunk relay for connecting said mechanism wit-h said trunk line, a locking circuit for said relay including said conductor, means for operating said mechanism to transmit impulses to a series of said switches under the control of said storage devices successively, and means effective to disconnect ground from the said con ductor at each storage device in turn as soon as the respectivedevices complete their control over said mechanism, whereby the said conductor is finally entirely disconnected from ground and the said trunk relay is deenergized.
  • a switch control circuit for controlling automatic switches, a switch control circuit, a step by step switch, a constantly driven interrupter, a relay intermittently energized by said interrupter, contacts on said relay for interrupting said control circuit and other contacts on said relay for sending V impulses of current to said switch, and means for preventing said contacts from interrupting said control circuit before an effective impulse is sent to said switchby said other contacts.
  • a switch control circuit for controlling automatic switches, a switch control circuit, a step by step switch, a relay and means for closing an intermittent energizing circuit therefor, cont-acts on said relay for interrupting said cont-r01 circuit, contacts on said relay for sending operating impulses to said switch, and means controlled in the movement of said switch for opening the ener- .llf)
  • a step by step switch a relay and means for closing an intermittent energizing circuit therefor, contacts on said relay for interrupting said control circuit, contacts on said relay for sending operating impulses to said switch, means controlled in the movement of said switch for opening the energizing circuit of said relay after a definite series of interruptions has been produced, a circuit for automatically driving said switch to a normal position independent of said relay, and means eflective after a definitetime interval for again completing the energizing circuit of said relay in order to produce another series of interruptions.
  • a switch control circuit for controlling automatic switches
  • a step by step switch a relay and means for closing an intermittent energizing circuit therefor
  • contacts on said relay for interrupting said control circuit
  • contacts on said relay for sending operating impulses to said switch
  • a set of digit keys means responsive to the actuation of a digit key for grounding a corresponding contact in the bank of said switch, and a second relay energized over a wiper of said switch when it engages the grounded contact for opening the circuit of said first relay.
  • automatic switches for connecting a calling and called line, operator cont-rolled storage devices for registering the digits in the number of the called line, a visual digit indicator for enabling the operator to check the accuracy of the registration, an impulse sending device controlled by said storage devices successively to operate a series or said switches to connect said lines, and means for etiacing the number displayed by said indicator while said switches are being operated.
  • automatic switches for connecting a calling and called line, an operators sender for controlling said switches and comprising operator controlled registering devices tor registering the digits in the number of the called line, keys common to said devices for setting them successively, and a number indicator for enabling the operator to check the accuracy of the registration.
  • keys common to said devices for setting them successively a number indicator comprising groups of lamps, and means for lighting the proper lamps to display the registered number to the operator.
  • an impulse sender an impulse generating device, spacing means for causing the impulses to be generated in groups, means including an automatic progressively movable switch for determining

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749535A (en) * 1951-11-23 1956-06-05 Westinghouse Electric Corp Telemetering systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749535A (en) * 1951-11-23 1956-06-05 Westinghouse Electric Corp Telemetering systems

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USRE17632E (en) 1930-04-01
US1615998A (en) 1927-02-01
GB175260A (en) 1923-04-12
FR26655E (cs)
FR543550A (fr) 1922-09-05

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