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. . . /.. Patented July 1, 1930 1,769,056 UNITED STATES PATENT OFFICE CHARLEs GELLINGs, OF LIVERPOOL, ENGLAND, ASSIGNOR, BY MESNE ASSIGNMENTs, o INC. OF CHICAGO, ILLINOIS, A Cor PoliRATION oE DELA WARE AUTOMATIC TELEPHONE SYSTEM Original application filed November 1, 1922, serial No. 598,239, now Patent No. 1,705,462, dated March 12, 1929, and in Great Britain December 17, 1921, OiVid? and this application filed July 13, 1928, serial ... No. 292,493. s * ? .. . . . ? The present invention concerns improve-. March 12, 1929, No. 1705,462), is to provide ments in or relating to telephone systems em So-called 'zone-metering arrangements in a ploying automatic , and more par System such as outlined above. ticularly to improvements in that type of sys A further object is to utilize the same reg tem which employs a register device for stor istering apparatus for controlling the opera 55 ing up impulses and thereafter controlling the tion of the switching apparatus and for con operation of automatic switches to complete trolling the variable assessing apparatus. the connection. Such registers have been Other objects and features will appear as largely used in connection with what are the perusal of the description progresses. ii. known as revertive control systems, that is 60 to say, systems in which series of impulses referringThe invention to the accompanyingwill be better understood drawings, byin corresponding to the setting of the registers which Figs. 1, 2,3,4, and 5 illustrate by way are sent back from the selector. Switches suc of example a complete arrangement for car rying the invention into effect, cessively as they operate to complete the con 65 nection. . . ,? •?? Referring to Figures 1 to 5, it will be as One of the features of the present disclo Sumed that it is desired to establish a con sure is the application of such registers to nection between a subscriber at substation A automatic telephone systems of the Strowger to a subscriber at substation A. The sub or like type, in which the impulses are emitted scriber at substation. A lifts his receiver, from the register to control the operation of which in the usual manner initiates the op. 0 the selector and connector switches. Such eration of the line Cto establish con registers are particularly advantageous in nection by means of its wipers 11, 12, and large net-works where they facilitate the 200 with an outgoing primary trunk line 13, change of subscribers' numbers, and also fa 14. On the switching , 15 of the line C. cilitate trunking changes which may be nec switch operating, a circuit will be completed 75 essary. for the line relay 16 of a group of relays Another feature of the present disclosure associated with the trunk line selected, as relates to an improved register and trans follows: battery, relay 16, contact 17, upper lator for use for instance in converting large winding of relay 18, line 13, wiper 11, substa net-works from manual to automatic Work stion A, wiper 12, line 14, contact 19, relay 16 80 ing, in which the names of the manual ex to earth. Relay 18 is so designed that it can changes are retained, and for this reason the only energize when both its windings assist number holes of the dial are given alpha each other, which only occurs when the cur betical as well as numerical designations and rent through the speaking leads is reversed, the subscriber first dials a number of series therefore only relay 16 energizes and at its 8 of impulses corresponding to the first letters contact 20 completes a circuit for relay, 21. in the name of the exchange, usually the first Relay 21 energizes and at its contact 22 com pletes a circuit for the switching relay 23 in threeAccordingly, letters. a registering. . . . device is pro series with rotary magnet 24 of a rotary vided adapted to respond to a plurality of switch F, while at its contact 25 it connects series of impulses, usually 3, and to have a the test wiper 26 of the switch F to a junc separate and distinct setting position for tion point of the magnet 24 and the switch each exchange or group of lines in the net ing relay 23. The operation is thenidentical work, so that by a suitable translating ar with that of the well-known rotary line rangement any desired series or combination switch, and the magnet 24 is operated until of series of impulses may be generated to wiper 26 engages an unearthed contact. It route the call to the desired exchange. will be assumed this is the contact 27. When The main object of the present invention this occurs, relay 23 operates and Switches which is a division of my application Serial through the leads 28, 29, 30, 31 to the bank No. 598,239, filed November 1, 1922, (issued contacts 32,33, 34,35, while at its contact 36 a. 2. 1,769,056 circuit is completed for relay 37 as follows: NS III, INS IV are operated in accordance . battery, relay.37, contact 27, wiper 26, con with these last three digits and serve to tact 36, contact 22, earth. Relay 37 energizes store the number of the wanted subscriber and connects earth to the lead 38, which lead in the exchange determined by the first three 38 serves as a holding lead for maintaining digits. The distributing frames DFI, DFII 70 various devices operated as long as the relay consist of ten terminals on one side and a 37 is operated. The subscriber at A will now number of terminals corresponding to the hear the dial tone from transformer 46 over number of code relays provided on the other magnet 45, contact 44, wiper 43, relay 42, con side. The ten terminals of the distributing tacts 34, 41, condenser 47, lead 14 and his in frames DF I, and DF II are connected to 75 0. strument, and will operate his impulse corresponding contacts on sender switches SS 39 in accordance with the first series of im I and SS II respectively. Similarly, the ten pulses i.e., the first digit of the exchange code, contacts of the switches NSI to NSIV swept the relay 16, thereby releases a number of over by the wipers 78 to 81, are connected to times and at its contact 40 completes a cir the ten contacts of other sender switches SS 80 5 cuit as follows:-earth, contact 40, contact 41, III. SS IV, SS V, SS VI. When the code contact 34, series relay 42, wiper 43, contact relay. CR is operated, a circuit is prepared 44, magnet 45, winding of dial tone trans through its contact 82 which may be traced former 46 to battery. The magnet .45 and as follows: earth, contact. 82, lead 83, com series relay 42 respond to this first series of mon to all the code relays, contact 84, lead 85, 85 20 impulses, the magnet 45 to step the wiper's contact 86 (Fig. 5), lower winding of relay 48 to 50 of minor switch MS a number of steps 87, lead 88, contact 89 (Figure 4), contact 90, in accordance with the digit dialled while lead 91, contact 92, controlled by the impulse the series relay 42 at contact 51 completes a cam 94. The impulse cams 93 and 94 are circuit for slow release relay 52 which en mounted on a common shaft and while the 90 ergizes and at its contact 53 prepares a cir calm 93 is adapted to generate impulses cor cuit for the magnet 54 of the master digit responding to the impulses generated by a switch. MDS: this circuit is completed at dial switch or impulse sender of the usual contact 55 after relay 42 has deenergized at type, the calm 94 is adapted to close a circuit only between impulses. This insures that 30 the end of a first series of impulses, so that only the correct impulses are generated and thenext wiper series 43 of is impulsesadvanced thereby to contact passes 56. overThe that no circuit is completed at an unsuitable the same circuit to wiper 43 whence it passes time. As soon, therefore, as the cam 94 closes over contact 56 and wiper 49 to the vertical contact 92, relay87 energizes and at its con 35 magnet 57 of a Strowger switch SS having tact 95 completes a locking circuit for itself 100 two directional movements. The Strowger to the lead 85, and earth on contact 82 as pre switch SS represents one of a number, usual viously described. At contact 96 a circuit is ly, 8 or 9, connected with the different con prepared for impulse relay 97, which ener tacts accessible to the wipers 48 to 50, the gizes each time the cam 93 closes the contact 40 vertical magnet responds to raise the wipers 98. Relay 97 at contact 99 thereby periodical 05 to the level corresponding to this series of ly opens a circuit across the leads 100 and impulses on the completion of which the '101, which leads extend via contacts 32 and magnet 54 has its circuit completed as be 33 (Figure 1) wipers 102, 103, leads 28, 29, fore and steps the wiper 43 to the contact contacts 104 105 to line relay of selector EI, 45 58 so that the impulses next effect the opera which relay is not shown, as it forms no part 110 tion of the rotary magnet 59 over the wiper of the present invention. It will thus be ap 50. The wipers of the switch SS are there preciated that each time contact 99 is opened, by rotated to certain contacts in the row. the vertical magnet of the selector Eº re When this occurs, a circuit is completed for sponds and raises the wipers one step. Relay 50 a code relay CR corresponding to the ex 97 at contact 106 also completes a circuit over 15 change required connected to one of the con lead 107, contacts 108 to 112 (Figure 4), mag tacts selected, this circuit may be traced from net 114, to battery. Magnet. 114 of sender switch SS I, therefore, responds with the toearth, battery. wiper 60,Relay contact CR, 61,therefore, lead 62, energizesrelay. CR vertical magnet of the selector switch E' until 55 and connects earthat contacts 63 and 64 to the Wiper 115 engages the contact 116 con 120 contacts 65 and 66 of two distributing frames nected to that contact 17 on the frame DF DF. I and DF II. On the cessation of the to which the contact 65 selected by the code third digit, the wiper. 43 is advanced to the relay. CR has been connected. When this contact 67, so that the impulse circuit may be happens, a circuit may be traced as follows: 60 traced over lead 68 to magnet 69 of the first earth, contacts 64, 65. 117, 16, wiper 115, 125 storing switch NSI. At the cessation of this relay 118 to battery. Relay 118 energizes and digit and the remaining three digits, the at contact 112 opens the circuit of magnet wiper 43 is brought successively into engage 114, which thereupon comes to rest, at coli ment with contacts 71 to 74. The magnets tact 84 disconnects earth from lead 85, there 75 to 77 of the number storage switch NS III, by releasing relay 87 and preventing the fur 30 1,769,056 ther energization of relay 97, so that exact energized. This relay operates in a similar ly the same number of impulses operate the manner to relay 118 and for that reason no selector E as operate the switch SS , the further description need be given of the op i numberbeing determinedentirelyby the con erating circuits, the selector E° is operated nection made at the distributing frame DFI. At contact 119, relay 118 locks itself ener switchto the SSrequired II, and level in thatas determined level hunts byfor the an 70 gized over a circuit which may be traced as idle trunk line passing through the repeater. follows: earth, battery, relay 118, contact R° to a third selector E. Repeater R° and 119, lead 38 which was earthed by relay 37, selector E are identical in construction with 0 and at contact 119 connects the grounded those previously described, and when, E° is lead 38 to the restoring bank 185, whereupon taken into use, a booster impulse is trans the switch is automatically advanced to nor mitted and repeated at R by means of relay mal by magnet 114, which interrupts its own 132 and battery B and contact 133 to cause circuit at contact 113. If the number switch the reenergization of relay 135. Relay 132 NSI has left its normal position, off normal is adjusted similarly to relay 135, then if the contact 70 will be closed and a circuit pre off normal contact 146 is closed, the relay 80 pared as follows: earth, contact 70, contact 147 will energize and relays 87 and 97 will 120, relay 121 to lead 122. This circuit is not completed until contact. 123 is closed which impulsesoperate as generated before described, being now the controlled number byof will only take place after the next switch SS III. The third selector operates to the 85 to respond to the train of impulses has been required level and selects an idle fourth selec taken into use. The selector E! on being tor E'. The booster impulse is then repeated raised to the desired level, rotates automati over the lower talking conductor to cause cally to find an idle line, assumed to be the the operation of relay 135 when the cycle is 25 line 124,125 leading through repeater R' of completed and the succeeding impulses are 90 well-known construction, and of which only sent out in a similar manner under the con - the polarized relay 126 is shown, to a selector trol of SSII-SSW, and SS WI, successively. E? in another exchange. On the selector E° The connector H responds to the last two being taken into use, the relay 138 of the impulses and as there is no trunk hunting - 30 selector E energizes to switch through and a operation between these impulses, it is suffi momentary circuit is completed as follows; cient to arrange that the relay 148 is some until the release relay 127 falls back, which what slow to pull up, thereby insuring that it does shortly afterwards: earth, battery the necessary pause takes place between the B°, resistance 128, contacts 129, 130, 105, leads transmission of these last two series of im: 29, contacts 103, 33, lead 101, contact. 134, to pulses without requiring the transmission of relay 135 and normal battery to earth. The a special booster impulse. On the terminal 100 battery B9 has its negative pole connected tion of the transmission of the last series of to earth instead of its positive pole, which is impulses, the relay 149 energizes and, besides the usual convention, and, therefore, an in performing the functions previously de 40 creased current will flow through the relay scribed with relation to relay 118, at contact 05 135, this relay is so adjusted that it will not 152 connects leads 153 and 154 together. By respond to normal currents on the line, but this operation, a circuit is prepared as fol will respond to the increased currents. Relay lows: earth, contact. 155, lead 153, contact 135, therefore, responds during the energiza 152, lead 154, contact 74, wiper 43, relay:42, 45 tion of the release relay and at contact 136 contacts 34, 41, lead 30, contacts 157,158, O completes a locking circuit for itself through relay, 159 to battery. This circuit includes contact 137 to earth. The closure of contact contact 155 for a purpose to be later ex . . 123 completes the circuit previously de plained, and when it is completed, relay 159, Scribed and relay 121 energizes, and at con being of high resistance, energizes alone in 50 tact 122, completes the circuit between the this circuit and at contacts 160,161, switches :15 leads 88 and 91, opened at contact 89 on relay through the leads 13 and 14 to the trunklines 118 energizing. As earth was connected to 124, 125. lead 85 from lead 38, through contacts 140, At contact 162 an impulse circuit is com 141, it will be appreciated that conditions are pleted which may be traced as follows: earth, .55 now the same as they were when the opera battery, magnet 163 of the meter switch MR, 120 tion of switch SS I was started. Relay. 87 contact 164, contact 162, lead 31, contact 35, energizes, as also relay 97 to perform a simi wiper 48, wiper 165, contact 166, lead 167, lar function, relay 97 this time causing the op contact 168 controlled by the three point cam eration of the vertical magnet of selector E, 169. It should be here explained that the and of the magnet 142 of sender switch SS II, cams 156,170, 171, 169, 172,173 are arranged. the circuit of this latter magnet being com on the same shaft, the pick-up cam 156 clos pleted through contact 143. This operation ing its spring 155 first followed by the cams . continues until Wiper 144 engages the con 171, 169,172, and 173, generating respective tact selected by the connection at the dis ly 4, 3, 2, 1 impulses in a cycle and finally by tributing frame DF II when relay 143 is stop cam 170, which serves to render further 30 4. 1,769,056 - impulses ineffective. Further, as the register be appreciated that the first of the digits of controller is located at the outgoing exchange the subscriber's number have been stored on and the contact 166 is representative of the a register, the first three digits have been wanted exchange, it is possible to accurately converted into two digits according to the determine the charge to be made for a con impulses required, to reach the desired ex 70 nection and for this reason it is assumed for change, the remaining impulses have been the connection described the charge to be generated in sequence and the call set up, and made is three units, consequently, the con metering effected on the response of the tact 166 is connected to the lead 167, which is called subscriber. controlled by the three point cam 169, ob A time allarm relay TA is provided to pre 75 10 viously a different charge can be made by vent an impulse register being held up un simply connecting contact 166 to any of the duly, its circuit is completed through con leads controlled by the 1, 2, or 4 point cams tacts 207, 208 when relay 37 is energized. 173, 172,171, respectively. The magnet 163, Relay TA is slow to energize, but quick to therefore, is connected up as above described restore and is so arranged that if a predeter 80 25 under the control of pick-up cam 156, at con mined time has elapsed between the instant tacts 155, and responds three times over the that relay 37 energizes and the subscriber circuit described and steps the wiper 174 to commences to dial or a similar delay occurs third contact. The stop cam 170 then closes between Successive impulses, as determined contact 175, completing a circuit as follows: by the energization of relay 42, a circuit will earth, contacts 175, 176, 177, relay 178 to bat be completed from earth, through contact tery. Relay 178 energizes and at 164 opens 209, relay 42, contacts 34,41, lead 30, con the circuit of magnet 163, at contact 179 tacts 157, 158, relay 159 to battery. Relay closes allocking circuit for itself to the re 159, therefore, energizes and brings about lease trunk conductor 180, and at contact 181 the disconnection of the register switches so 90 25 removes earth from the contact 182 which had that these may be taken into use for another maintained relay 21 energized after relay 16 call. The subscriber will not then get his had been disconnected at contacts 17 and 19. dial tone and can only get this by hanging Relay 21 then deenergizes and at contact. 22 up his receiver and initiating a fresh call. opens the circuit of relay 23, which, accord As the number of register sets are limited, it 30 ingly, deenergizes and frees the impulse reg is important to insure that these are not taken ister. The opening of contact 22 also causes into use except when required. the release of relay 37, which falls back and It will be noted that in the regular con at contact 194 closes a circuit for release mag troller set shown in Figure 4, it is necessary nets 192, 190, and 191 of switches MDS, MS, to provide contact positions for every possi 100 35 and SS, respectively, which thus restore to ble combination of the three digits. This ap normal. Relay 37 at contact 193 connects proximates 1,000 positions and would neces earth to the lead 151 to release, the switches sitate the use of one minor switch and 10 NS II to NS IV. ; Strowger switches. In practice, the whole At the connector H the ringing had been 10 are not required, usually 8 or 9 being suf 40 initiated in the usual manner and the called ficient, but in any case a much larger number Subscriber rung. On his response, the back of contact positions must be provided than bridge relay (not shown) of the connector H are required for the number of exchanges in energizes and reverses current over the trunk a net-work, as in most cases, there would be conductors 124 and 125, thereby energizing less than 100 exchanges in a net-work and 110 the polarized relays 126 of the repeaters to sometimes no more than 25 or 50. disconnect the relays similar to 132, and fur What is claimed is: ther to energize the relay 18. Its two wind 1. In a telephone system wherein register ings have now so energized as to assist each sets responsive to a plurality of digits and other. Relay 18 does not energize immedi having a distinct setting for each office in a r 50) ately, - but only* when the start cam 196 has multi-office net work are provided, and in closed the contact 197. When this occurs, a which impulse sending apparatus is governed circuit is closed for the meter M which may in accordance with the setting of the register be traced as follows: earth, contact 198, sets to transmit directive impulses to the viper 174, in third off normal position, con switching apparatus, means controlled by 20 5 tact 199, wiper 200, contact 201, meter M to said register sets for also governing the battery. The meter, therefore, is energized charge assessed against calling subscribers three times by the three point cam 202 when in accordance with the respective destina tions of the calls. a circuit is closed by step cam 204 as follows: 25 (i) earth, contact 203, contact 205, release mag 2. In an automatic telephone system, trunk net 206 to battery. The switch MR is, there lines over which connections are to be ex fore, restored to normal and no further im tended from calling lines, registering appa pulses can be generated. The meter has ratus common to said trunk lines, means con therefore been operated in accordance with trolled from a calling line for setting the the charge for the connection. It will thus registering apparatus in accordance with the 1,769,056 destination of a call, separate values being assigned to the calls in accordance with their a charge against the calling line commensu destinations, a call-value indicating device rate, with the location of the called line. individualto each trunkline, and means con In witness whereof, I hereunto subscribe 5 trolled from the common registering appa my name this 25th day of June, A. D. 1928. ratus for setting said indicating devices in - CHARLES GILLINGS. accordance with the destination of the calls. which3. In calls a telephone afe to be system, extended trunk from lines calling over 10 lines, a device individual to each trunk line for assessing a charge against the calling line in accordance with the destination of the call, registering apparatus common to a plu rality of trunklines and operable from call ing lines in accordance with the destination 15 of calls, and means for setting said devices 80 . inmon accordance registering with apparatus. the setting of the com 4. In a multi-office telephone system, trunk 20 lines in one office over which connections originated in such office are to be extended, 85 means individual to each trunk line for con trolling the assessing of a charge against calling subscribers using such trunklines, 25 and controlling means in said one office com mon to a plurality of said trunk lines for 90 governing the setting of said individual e8.S. - - - 5. In a telephone system, trunklines over 30 which connections from calling lines to called lines are to be extended, adjustable means 95 individual to each trunk line for controlling the assessing of a charge against a calling subscriber using such trunk line, and regis tering apparatus common to a plurality of I trunk lines and arranged to be set over any 100 trunk line, over a circuit path independent of the connection extended from such trunk line toward a called line, to control the ad 40 justment of said means. . . . 6. In a telephone system, a trunkline over 105 - which connections are to be extended, means for extending a telephone connection to said trunk line and for subsequently further ex 45 tending the said connection over the trunk line toward a called line, registering appa 0. ratus common to said trunk and other trunk lines, means for extending a branch connec tion from said trunkline to the common ap 50 p aratus and for Setting the common appa- i ratus in accordance with the destination of a 115 call, a charge accessing device on said trunk line, and means for setting said device over said branch connection in accordance with 55 the setting of said common registering ap 120 paratus.7. In a telephone- - - system, means for e???? tending a telephone connection from a calling line to a called line and for extending a 60 branchregistering connection apparatus from set the over main said connection, branch 125 connection from the calling line in accord ance with the location of the called line, and means controlled over said branch connection 65 from said registering apparatus for assessing 130