March 23, 1954 C. E. LOMAX 2,673,243 TELEPHONE COIN COLLECTION SYSTEM Filed July 29, 1950 5 Sheets-Sheet li
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INVENTOR. CLARENCE E. LOMAX
ATTORNEY March 23, 1954 C. E. LOMAX 2,673,243 TELEPHONE COIN COLLECTION SYSTEM Filed July 29, 1950 5. Sheets-Sheet 2
INVENTOR. CLARENCE E. LOMAX
ATTORNEY March 23, 1954 C. E. LOMAX 2,673,243 TELEPHONE COIN COLLECTION SYSTEM Filed July 29, 1950 5 Sheets-Sheet 3
INVENTOR CLARENCE E. LOMAX
ATTORNEY March 23, 1954 C. E. LOMAX 2,673,243 TELEPHONE COIN COLLECTION SYSTEM Filed July 29, 1950 5. Sheets-Sheet 4
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INVENTOR. CLARENCE E. LOMAX 242.2% ATTORNEY March 23, 1954 C. E. OMAX 2,673,243 TELEPHONE COIN COLLECTION SYSTEM
INVENTOR. CLARENCE E. LOMAX
ATTORNEY Patented Mar. 23, 1954 2,673,243
UNITED STATES PATENT OFFICE 2,673,243 TELEPHONE COIN COLLECTION SYSTEM Clarence E. Lomax, Chicago, Ill., assignor to Ill.,Automatic a corporation Electric of Laboratories,Delaware Inc., Chicago, Application July 29, 1950, Serial No. 16,756 6 Claims, (C1, 179-6.3) This invention relates in general to automatic 2 telephone systems and, more particularly, to hopper are also modified so that dimes and quar means for controlling the coin mechanism where ters will be guided to one channel of the hopper in it is required that coins of a certain denomina While nickels only will be directed to the other. tion only can initiate a call. The coin trigger that controls the operation of the The main object of the present invention is the 5 coin Springs protrudes into one of these chan provision of a new and novel paystation circuit nels-the one passing dimes and quarters. There arrangement wherein a party operating the dial fore, only dimes or quarters can trip the coin subsequent to the depositing of a non-initiating Springs and initiate a call. It should be under denomination coin will cause that particular coin stood that any mechanical arrangement that pro to be refunded. O duces this same result could be used in combina It is another object of the invention to provide, tion with this circuit arrangement. The inventor in such an automatic telephone System, improved does not wish to be limited merely thereto. and simplified apparatus wherein refund poten The line finders indicated in Fig. 1 and Fig. 3 tial is automatically transmitted responsive to the may be of the well known Strowger type as shown answering of the operator only when the call orig in U. S. patent to Saunders No. 1,849,694, granted inates from a payStation. March 15, 1932. The line circuits indicated may It is another object of the invention to provide also be of the type as shown in the above-men improved and exceedingly simple paystation cir tioned patent. The neon tube shown in Fig. 1 cuit apparatus wherein a more positive indication : has the Well-known characteristic of being non of the success or failure of manual operation of conductive until a predetermined voltage is im the coin magnets is afforded the operator. pressed across the terminals thereof. Following These and other objects are accomplished a,c- ionization of the gas contained therein the volt cording to the invention, by the arrangement and age required to maintain the tube conductive is combination of elements set forth in the following substantially less than that required for initiating description, defined in the appended claims and 2. 5 ionization. Also, the resistance of the device is illustratively exemplified in the accompanying Substantially lessened after the device is rendered drawings, in which: conductive. This neon tube is so arranged in the Fig. 1 shows an automatic substation of the circuit that it will form a path for refunding volt payStation type, an associated line circuit and a age and still bar the line from ground through the succeeding line finder. 30 coin magnets when the coin springs are not Fig. 2 shows a portion of the paystation re tripped. peater associated with the line finder. It should be understood that any suitable dis Fig. 3 shows the remainder of the paystation charge device could be used in lieu of a neon tube. repeater circuit associated with its succeeding se- : The inventor does not wish to be limited merely lector. A regular subscriber and a switch train 3 5 thereto. is illustrated in the upper right section. The selectors indicated in Fig. 3 may be of the Fig. 4. ShoWS a portion of the combined line and Well known Strowger type similar to the selector shown in U. S. Patent No. 1,956,374, granted CLRrecording trunk). trunk circuit (hereinafter referred to as April 24, 1934. - Fig. 5 shows the remainder of the CLR, trunk In order to explain the operation of the cir and the operator's cord and coin control circuits. cuits, it will first be assumed that a party wishes Figs. 1-5 are assembled from left to right in to extend a call from the automatic payStation A Order. to a subscriber in a distant exchange, not shown, In the preferred form of this invention the air and the party attempts to do so by depositing a rangement is such that a dime or a quarter must nickel in the coin collecting mechanism at the be deposited before a call may be initiated. The paystation. The nickel would descend through coin collect-refund mechanism shown in Fig. 1 the modified coin race emerging and entering the may be of the well known type as illustrated in hopper at the top of channel 6. The coin would U. S. patent to George A. Long, No. 1,886,409, then proceed unobstructed to arresting device ), granted November 8, 1932, with a slight modifica 50 whereupon it is retained. It will be seen from the tion of the hopper. The hopper is enlarged and diagram of the coin hopper mechanism in Fig. 1 so constructed that two distinct and separate that coins traversing channel S will completely channels are provided to pass the coins to the circumvent coin trigger A. Thus, the depositing arresting device. The coin 'races leading to the of a nickel will cause no action whatsoever. The resultis the same as if no coin had been deposited. 2,673,243 4. 3 back and closing contact 213 operates hold relay It will now be assumed that following the 25, traced over the following path: ground, con depositing of said nickel the receiver is removed. tact 68b, conductor 9, contact 23, contact A loop circuit is formed through paystation A, 233, through hold relay 250 to battery. Release traced over the following path: line -L, diai 5 relay 239, being of the slow-to-release type Will pulsing contact , hook-switch contact 8, induc retain contact 233 closed during the time its tion coil Winding , talking transmitter 2, coil energizing circuit is momentarily opened at Con tone transmitter 3 and resistor 4 in parallel, tact 22 due to pulsing. Hold relay 25, by clos to line --L. The line relay in the indicated line ing contact 25 places resistor 267 across coin circuit will energize over this loop circuit in denser 266, reason therefor hereinafter explained. Well-known manner and a line finder will subse ..) Hold relay 25C also, by closing contact 252, causes quently initiate a search for calling payStation relay 30 to operate, traced over the following line A, also in well known manner. The line path: ground, contact 252, contact 209, conductor findel' being of the pre-seizing type, will close a . 83, contact 57, through relay 3 to battery. loop within itself to the associated succeeding Relay 39, once operated, places ground on con repeater before the calling line is actually found. tacts 3 and 32 to energize relays and (, Once it is found the loop, of course, extends back respectively. Relay 40, in closing contacts iá2 to the payStation. Line relay. 20 will then ener and 44 prepares a path for the refunding po gize, traced over the following path: ground, im tential. Other functions of relay f () will subse pedance resistor 26, lower winding of differen quently be described. Relay if, by closing con tial relay 22, repeating coil winding 262, con 20 tact 4 completes the path and applies refund ductor f3, contact 64, contact 43, line. --L, ing potential back to the substation line, traced loop circuit hereinbefore explained, line-I, con over the following path: negative 110 volt re tact is, contact 6 , conductor f7, repeating funding potential, lamp Ll, contacts 9, 4, 42, coil Winding 23, upper winding of differential conductor -L, line finder wiper -, line finder relay 228, through line relay 20 to battery. As bank contact - to substation line -L. At this is well known in the art, differential relay 22 point, namely, during pulsing, the remaining cir Will not operate when its two windings are ener cuit, from line-L, over dial off-normal contact gized simultaneously. Line relay 2f ), in closing 9, neon tube , through coin magnets 2 to ground contact 2 2, completes a path to operate re will be open at dial off-normal contact 3. Re lease relay 23 (, traced over the following patin: fund voltage, however, will be applied after as ground, contact 68b, conductor 79, contact, 2.2, Well as during the pulsing period as will be Sub through release relay 230 to battery. Pulse re peating contact 2 is also closed upon operation sequentlyRelay 40described. also opens the circuit to line relay of line relay 28, but serves no useful function 2 : G, hereinbefore traced, at contacts 4 and at this point. Release relay 23 in closing con f 43. Line relay 20 will therefore receive no ta,3t 23 closes the loop to pre-seize the associated more pulses, but restoring will permit hold relay Succeeding selector, traced over the following 250 to remain energized, circuit for which has path: line -l, conductor 72, contact 62, con been traced hereinbefore. Release relay 230, ductor is , contact 2, contact 23 , contact 222, being of the slow-to-release type, Will maintain conductor 74, contact 65, conductor 75, to line 4.) the energizing circuit for hold relay 258 at Con --T. Release relay 23, in closing contact, 232 tact, 233 and hold relay 250, also being of the applies ground to the control lead C to hold the slow-to-release type, Will prolong its operation preceding Switches. Release relay 239, in closing still further after release relay 230 no longer contact 33, partially completes an energizing can close contact 233. The result is that ground path for hold relay 250, circuit to be traced here 4. 5 on contact 252 is maintained until after pulsing inafter. It will be stated at this point that the is completed in order to hold relays 3, and shunt field relay 24) will not operate as the volt 40 in their operated positions, respective ener age impressed on each half of the relay is of gizing circuits having been hereinbefore de Such polarity that the resultant flux produced scribed. Refund potential is then applied to line by the two currents will aid and confine their -, during and after the dialing of a digit, magnetic paths. Within the core of the shunt field When the dial comes back to normal the re relay, producing no movement of the shunt field funding potential will be impressed acroSS the arnature. Dial tone is not heard by the party neon tube and coin magnets in Series as here at Substation A. as the repeating coil that trans inbefore described. The negative 110 volts is forms the tone from the selector, circuit to be 5 5 Suficient to cause this neon discharge device to traced hereinafter, will be disabled. This dis become ionized and conductive. Thus the coin ablement of the repeating coil is effected by a magnets 2 will operate and cause arresting de short around windings 263 and 264 over con vice fo to pass the nickel to the coin return re tact 22. ceptacle. Relay 40, in closing contact 48, The party at Substation. A now dials a digit in (33 grounds the control lead C. This ground is pro an attempt to communicate with a party at a vided so that removal of ground at Contact .232, distant station. Line relay 20 being in series responsive to the complete deenergization of re With the dial pulsing contact 7, responds to the lay 23, Will not release the preceding line finder. pulses. Once again the pulse repeating contact The finder Will thus be held as long as refund 2 will serve no useful function as a shunt over battery is applied to conductor -. contact 22 will maintain the pulse repeating As the depositing of a nickel affected nothing circuit in a constant state, preventing the repeat whatsoever, it can easily be understood that the iing of the dialed pulses to pass on and operate identical result as heretofore described would the Selector. This pulse repeating circuit will likewise occur if a party at paystation. A lifted Subsequently be described. 70 Thus, it can be seen that paystation A is in the receiver and attempted to dial without de capable of extending a call in the present con positing a coin. Similarly, the same operation dition, namely, subsequent to the depositing of Would have taken place had the party at pay a nickel. Responsive to the first pulse of the station. A hung up without dialing. Opening of particular digit dialed, line relay 2 to in falling the hook-switch contact 8, responsive to replac 5 2,678,248 ing the receiver, will open the loop circuit, as 6 hereinbefore traced. Since the first momentary ductor f73, repeating coil winding 262 to lower interruption of the loop circuit, effected by the winding of differential relay 220. Since only the operation of dialing, ultimately results in appli upper winding of differential relay 220 is ener cation of refunding potential to the coin magnets gized operation of same will follow. Differential 2, as hereinbefore described, the permanent open relay 220, in closing contact 22, prepares the ing of hookSwitch contact 8 Will similarly do S0. energizing circuit for relay 20, traced herein It will now be assumed that upon failure to after. initiate a call with a nickel the party at pay Line relay 2 is, in closing contact 22, Operates station. A deposits a dime or a quarter. The dime release relay 23, circuit for which has been or quarter descends the appropriate coin race O traced hereinbefore. Release relay 238, in clos emerging at the opening of channel 5. From ing contact 23 preseizes the associated Selector, the coin mechanism diagram in Fig. 1 it can be circuit for which also has been traced hereinbe seen that coin trigger will be tripped as the fore. Once seized, the Selector Will return ground dime or quarter descends channel 5. The coin back over the control C lead. This ground Will Will be retained on arresting device in Well 5 cause relay 20) to operate over the following known manner and the tripping of coin trigger path: ground from selector, control C lead, con 4 will actuate coin springs 3, also in Well known tact 22, through relay 29 to battery. This manner. By closing coin Springs 3 line -L is ground returned from the associated succeeding effectively grounded through coin magnets 2. Selector on the control C lead Will also energize The function of this ground will be hereinafter 20 the right winding of shunt field relay 2i. Bat explained. Removal of the receiver at paysta tery and ground on conductors - and --L, re tion A, either before or after the depositing of the spectively, will also be returned from the line dime or quarter, will cause line relay 20 to op relay of the selector to energize the iaft Winding erate, once the line is found, over the loop in of shunt, field relay 248, traced over the follow the same manner as previously described for 25 ing path: negative battery, through top winding the nickel depositing. However, at this time of selector line relay (not shown), conductor -Li, the ground on line - at the payStation will un conductor 2, contact 52, conductor , con balance differential relay 228 and cause opera tact 2, contact 23, repeating coil winding 263, tion of same. The upper winding of differen through left winding of sihunt field relay. 249, re tial relay 220 will be energized over the following peating coil winding 284, conductor 74, contact path: ground at the payStation, through coin E65, conductor f75, conductor --L, through bot magnets 2, coin Springs 3, dial contact. 9, pay ton winding of selector line relay (not shown) to station line -L, line finder, bank contact -Li, ground. At this point the Voltages impressed on line finder wiper -L, conductor -, contact A, each side of shunt, field relay 240 will be of such contact 6, conductor 7, repeating coil wind polarity that the armature will not be actuated, ing 2.5i, through upper winding of differential reason therefor explained hereinbefore. Relay relay 225 and line relay 2 to battery. There 23, in opening contact 23i and thereby removing is also another energizing path for the upper the shunt around contacts 2, renders the pulse winding of differential relay 229, traced over repeating circuit capable of functioning as such, the following path: ground, impedance resistor 40 tjaced over the following path: ground, lower 268, lower winding of differential relay 22.9, re winding of selector line relay, conductor --L, peating coil winding 262, conductor 73, contact conductor 75, contact 85, conductor 74, re 64, contact 43, conductor --T, line finder wiper peating coil winding 265, left winding of differ --I, line finder bank contact --L, paystation line ential relay 240, repeating coil winding 263, coin --L, coin tone transmitter f3 and resistor 4 tact 23, pulse repeating contact 2 , conductor in parallel, talking transmitter 2, induction coil , contact 62, conductor 2, conductor -L, winding , hookSwitch contact 8, dial pulsing upper winding of selector line relay to battery. contact , payStation line -L, line finder bank Relay 200 also, by opening contact, 282, permits contact -L, line finder wiper -Li, conductor -L, dial tone to be heard by the party at paystation A. contact f4, contact 6, conductor T), repeat 50 Dial tone A. C. voltage will be inductively cou ing coil winding 26, through top winding of pled to the conductor between ground aind the differential relay 22) and line relay 2 to battery. lower winding of the selector line relay. This The current nowy flowing through the upper wind dial tone will be impressed across the right two ing of differential relay 220 is essentially of the windings 263 and 264 of the repeating coil, traced Same magnitude as that flowing in the case of 5 wer the following path: through lower winding an ungrounded line -L, namely, coin Springs not of selector line relay, conductor --L, conductor closed. However, unlike that case the lowe' 25, contact f65, conductor 74, repeating coil Winding Will have ground on each side render winding 264, condenser 286 and left winding of ing it incapable of producing a flux to balance shunt field relay 24 in parallel, repeating coil Out that produced by the top winding. Ground ii winding 263, contact 23, contact 2; i, conductor to the left side of the lower winding of differ iii, contact 62, conductor 72, conductor -L, ential relay 22 will be traced over the follow through upper winding of Selector line relay, ing path: ground, through impedance resistor through battery to ground. The dial tone A. C. 28 to the lower winding of the differential re voltage, by transformer action, will be impressed lay 22. Ground to the right side of the lower across the left two windings 28 and 282 of the winding of differential relay 228 will be traced repeating coil and transmitted back to paystation over the following path: ground at the paysta A in Well known manner. Relay 2 also, in clos tion A, through coin magnets 2, coin Springs 3, ing contacts 263 and 294 shunt the upper and dial contact 9, dial pulsing contact , hookswitch lower windings, respectively, of differential re. contact 8, induction coil winding , talking lay 225. Shunting differential relay 225 elimi transmitter 2, coin tone transmitter i3 and re nates same from the dial pulsing path, circuit sistor 4 in parallel, paystation line --L, line for which has been traced hereinhefore, thereby finder bank contact --L, line finder wiper I, increasing the pulsing current. Shunting differ. conductor --L, contact 43, contact 64, con ential relay 220 also provides more transmitter 5 i 2 current when free service stations are dialed. 2,673,248 8 7 fashion as dial tone transmission the busy tone This is necessary since the completion of Such Will appear across the paystation A. The party calls will not cause reverse battery to be returned, at paystation. A will then replace the receiver and which is essential for the operation of the Switch cause the opening of hookswitch contact 8 and through relay S8, as will be explained herein consequently the opening of the energizing cir after. The paystation. A will therefore not ex cuit, traced hereinbefore, to the line relay 20. tend, clear of attachments, through the repeater. Line relay 29, in opening contact 2, opens the For free service calls the talking circuit will be pulse repeating circuit, traced hereinbefore, caus identical to the dial pulsing path, traced over the ing the succeeding Switch to release. Line relay following path: ground, impedance resistor 26, 28, in opening, contact 22, causes release relay contact 294, repeating coil winding 262, conduc O 239 to restore. Release relay 230, being of the tor 73, contact 64, contact 43, conductor --, slow-to-release type, may restore either before calling loop, conductor -L, contact A, contact or after the succeeding switches release. Relay 64, conductor f70, repeating coil winding 26, f58 in still being energized at this time, main contact 283, through line relay 2:3 to battery. tains ground at contact 53 to contact C to hold It can easily be seen that taking battery is Sup the preceding line finder. The succeeding switch plied from the line relay 2 of the repeater for train in releasing and no longer sending ground free calls rather than from the connector line back On control C causes relay 29 to restore, relay as in the case of regular calls. It can holding circuit for which has been traced herein likewise be seen that the elimination of the dif before. Relay 28, in restoring and thereby clos ferential relay and its resistance will increase 20 ing contact 297 operates relay 8, traced over the transmitter current. Relay 23 also, by clos the following path: ground, contact 27, con ing contact 25 locks itself operated from the ductor 8, contact 54, through relay 49 to ground that is returned from the Selector over battery. Relay 40, in closing contacts 42, con the control C lead. This self-locking feature is nects one side of relay 20 to line -. Since the necessary since contacts 283 and 234 in closing. line - is grounded through coin magnets 2, will cause differential relay 22 to restore an: effected by the depositing of a dime or quarter open the original energizing circuit for relay 233 as hereinbefore explained, relay 20 will operate, at contact 22. Relay-26 also, in closing coli traced over the following path: ground at pay tact 208 prepares a path for resistor 269 to Station A, coin magnets 2, coin springs 3, dial shunt impedance resistor 26, circuit, for which 30 contact 3, line -L, line finder bank contact. -L, will be traced hereinafter. iRelay 23i also, in line finder wiper -, conductor -L, contact 42, closing contact 26, causes relay 53 to operate, contact 3, through relay 20 to battery. Relay traced over the following path: ground, contact 28, upon restoring opens the energizing circuit 206, conductor 82, through reiay i55 to battery. to relay 5, circuit for which has been traced Functions of relay 5 will be discussed herein hereinbefore. However, relay 29 in closing con tact 22 renders slow-to-release relay 5 a dif after.It is now assumed that Subsequent to the re- ferent energizing circuit before same relay 59 turn of dial tone the party at payStation A Wii can fully restore, traced over the following path: dial the digit combination peculiar to the desired ; ground, contact. 22, contact 55, through relay distant station. It Will further be a SSuited at 55 to battery. Relay 5 in maintaining contact this point that the called station Will be busy. $52 closed, relay 40 in closing contact 45, and Line relay 2 responds to the dial pulses, cir relay 29 in closing contact 2; cooperate to cuit, for which has been traced hereinbefore, and supply interrupted ground to operate relay if, by operating contact 2; which is in the pulse ; traced over the following path: interrupted repeating circuit, also traced hereinbefore, the ground, contact 52, contact 45, contact 21, pulses will be repeated to the Succeeding Selector. through relay to battery. Relay 9, being of The first pulse in causing line relay 28 to re the fast acting and release type will operate store and close contact 2 S will effect the oper periodically in response to the pulses of ground ation of slow-to-release hold relay 25, circuit received by it from interrupted ground. Thus, for which has been traced hereinbefore. Relay relay f (), in closing contact will apply refund 258, in closing contact 252, causes resistor 289 potential intermittently to coin magnets 2, cir to shunt impedance resistor 26), traced over the cuit for which has been traced hereinbefore. following path: ground, contact 252, contact 23, Relay 9, in closing contact 2 before f l (said resistor 23 to impedance resistor 26. Shunting relay Springs adjusted to operate in that order), of impedance resistor 263 will inprove dialing Will provide a different energizing circuit for and as release relay 238 and hold relay 25 are relay 29 during the period refund potential is both of the slow-to-release type, this improve applied to line -, traced over the following ment will be operative during the entire dialing path: ground, contact 5, contact 2, through operation. Relay 25 also, in closing contact relay 28 to battery. The original energizing 25 places resistor 23 in parallel with condenser circuit of relay 2 is opened at contact 3 in 255. This resistor 267 will also be maintained Order that the coin magnet 2 Will receive all of in the pulsing circuit during the dialing opera the current produced by the coin potentials. Re tion and will likewise improve pulsing. The pulse lay restores at the end of each pulse and will be repeated to the Succeeding SWitch train again connects relay 2 to line -L, circuit for which has been traced hereinbefore. If a pulse and cause the selection of the prope' station in of refund potential properly operated coin mag wellaving known assumed manner. the called station to be busy, nets 2 and refunds the coin, in well known man busy tone will be transmitted back to payStation nei, Coin SpringS 3 will open. With the neon A subsequent to the operation of the connector tube between ground and line -, relay 28 will associated with the called station. The busy tone restore. Relay 29, in restoring and opening con A. C. Woltage will originate at the connector and tact f2, will open the energizing circuit for extend back over the lines, via the preceding relay 9. Relay ff ), in opening contact, 4, switches, to repeating coil windings 263 and 264. will cause the removal of refund potential from Repeating coil windings 26i and 262 inductively receive the busy tone voltage and in similar 75 line-L, circuit for which has been traced herein 9 2,673,248 before. Relay 20 also, in opening contact 22, 10 will cause relay 50 to restore, circuit for which to a set of contacts associated with an idle CLR. has been traced hereinbefore. Relay 59, in re trunk. This sequence of operations is well known storing and opening contact 54, causes the in the art. Assuming now that an idle position restoration of relay 40, circuit for which has is found, a closed line loop will be extended to been traced hereinbefore. Relay 150 also, in energize relay 440, traced over the following opening contact t53 removes ground from the path: ground, through lower winding of relay C lead and causes the release of the finder. How 440, repeating coil winding 485, conductor 31, ever, if the coin is not properly disposed of coin springs 3 will remain closed and maintain relay contacts 363, 353, 343, 3 E3, 363, conductor --I, | 20 operated. Relay if 0 will then operate re O repeaterselector bank pulsing contact loop --L,as previously selector wiper described --L, over se peatedly from interrupted ground with the re lector wiper -I, selector bank contact -L, con Sulting refund voltage pulses transmitted back ductor -L, contacts 30?, 3 ii, 34,35i, 36, con to coin magnet 2. This operation will continue ductor 370, repeating coil winding 483, through until the coins are dislodged and refunded. Once upper winding of relay 440 to ground. Relay 440, disposed of the circuit will operate as hereinbefore 5 in closing contact 444, causes relay 430 to operate, explained. traced over the following path: ground, contact It is now assumed that the party at paystation $41, through relay 430 to battery. Relay 430, in A wishes to call another distant subscriber and closing contact 43 , causes relay 420 to operate, once again deposits a dime or quarter. It will traced over the following path: ground, contact further be assumed that the called line will not 20 43f, contact 4 if, through relay 420 to battery. be busy. As previously explained the party can Other functions of relay 430 will be hereinafter dial effectively subsequent to depositing of a dime explained. Relay 420 in closing contact 423 ap or quarter. Upon answering of the called party, plies ground to the C lead over conductor. 35 to the back bridge relay in the connector (not hold the preceding switches. As this is a pay shown) associated with the distant called sta station calling the toll operator, relay 459 will tion, will operate and reverse the battery to the operate, traced over the following path: ground repeater in well known manner. Thus, the polar at EC at selector, selector Wiper EC, selector bank ity of the voltage applied to the left hand wind contact EC, conductor 34, through relay 450 to ing of the shunt field relay 240 will be reversed battery. Functions of relay 5 will be herein from that hereinbefore explained. The flux now 30 after explained. Relay 430, in closing contact produced by the current in the left-hand wind 435 and relay 45, in closing contact 454, together ing will oppose the flux produced by the current cause relay 320 to operate, traced over the foll in the right-hand winding and the armature will lowing path: ground, contact 435, contact 33, be attracted to complete the two magnetic paths. contact 454, conductor 378, through relay 320 to Shunt field relay 240 thus operated will close con battery. Relay 430 also, in closing contact 434, tact 24 and cause the operation of the Switch and relay 350, in closing contact $52, together through relay f60, traced over the following path: cause the call signal lamp L5 at the jack asso ground from succeeding last switch, contact 2, ciated with the CLR trunk to illuminate inter conductor 77, through relay f60 to battery. mittently, traced over the following path: inter Switch through relay f68, in closing contact 67, 40 rupted ground, contact 452, contact 434, contact locks itself operated from ground over the C 406, through call signal lamp L5 to battery. Re lead. Switch through relay 60 in closing con lay 420 also, in closing contact 42 applies ring tacts 63 and 66 Switch lines --L, and --I direct back tone back over the line to the calling pay through to the switch train. Switch through re station. The flashing call signal lamp will in lay also, in closing contact 68a, causes relay 100 dicate to the operator that a paystation is de to become energized. Functions of relay CO will sirous of completing a toll call. The operator be hereinafter explained. Switch through relay now answers by inserting the plug associated 169 also, in opening contacts f6f and f 64 open with a cord. The ring, tip, and sleeve of the plug the energizing circuit to line relay 20, circuit are connected to the ring, tip, and sleeve for which has been traced hereinbefore. Line of the jack, respectively, and the hold con relay 20 in opening 212 and closing 2 3 restores sleeve of the jack, respectively, and the hold con and operates relays 230 and 250, respectively, as ductor at the jack is grounded. Relay 4 to will hereinbefore explained. At the conclusion of the then operate over the following path: ground, conversation and subsequent to the replacing of : contact 482, hold conductor H, through relay 4:0 the receiver by the called party, the succeeding to battery. Relay 40, in closing contact 412, switches will be released. Ground no longer con causes relay 400 to operate. Relay 410, in open ing back over the C-lead will cause switch through ing contact 4 fi, causes relay 420 to release after relay 69 and relay 200 to restore, circuits for a delay (relay 420 is of the slow-to-release type). which have been traced hereinbefore. The coin Relay 420 will restore and remove ground on the will now be disposed of by the same Sequence of 60 C lead at 423 but after relay 400 operates and ap operations as previously explained, with the ex plies another ground to C at control 493. Thus, ception that relay 00, being operated, will close the preceding switches will be held. Relay 430, in contact O2 and apply --110 V. collect potential instead of -110 v.refund. theopening calling contact paystation. 401, removes Relay ring 4C9, back in tone making from It will now be assumed that the party at pay 65 contact 404, causes relay 360 to operate, traced station. A wishes to make a toll call and, subse over the following path: ground, contact 494, quent to the depositing of a dime or quarter, conductor 376, through relay 360 to battery. Re dials the operator to do so. The selector shown lay 400 also, in closing contact 403 and opening is of the four wiper type and will be peculiar to contact 406 and relay 430 in closing contact 433, paystations only. The fourth wiper, EC, will be 70 together cause the interrupted ground to now grounded at the selector. The dial pulses will be flash intermittently the cord disconnect lamp L7 effective, as previously explained, and the wipers instead of the call signal lamp L5, traced over of the selector will vertically step to the toll op the following path: interrupted ground, contacts erator's level and then automatically step rotary 452, 434, 405, 424, 433, conductor S, cord plug 75 sleeve S through cord disconnect lamp IT to 2,678,248 - 12 11 lect key to so do, relay 340 will operate, traced battery. This flashing will only last a short time over the following path: ground at collect-refund as slow-to-operate release relay 42C will open the cord, contact 472, contact 475, plug tip 476, con cord disconnect circuit at contact 424. However, ductor 479, contact 455, conductor 379, through this short period of a flashing disconnect lamp relay 349 to battery. Relay 340, in closing con L will be another reminder to the operator that tact 342 applies --110 v. collect potential back out she is answering a paystation. Relay 360, in clos over the line - to operate coin magnets 2 and ing contacts 332 and 354, and in opening contacts collect the coins. ASSunning now that the Opera 36i and 363, causes a reversal of battery from tor may wish to refund manually and pushes the relay 440 to operate shunt field relay 240 in the refund key to so do, relay 330 will operate, traced repeater. As hereinbefore explained, operation 10 over, the following path: ground, contact 473, of shunt field relay 240 will cause the lines to be plug ring 477, conductor 483, contact 456, con switched through the repeater circuit to the CLR. ductor. 380, through relay 330 to battery. Relay trunk. Relay fee, in opening contact 408, causes 330, in closing contact 33i will cause relay 30 the restoration of relay 320, circuit for Which has 15 to operate, traced over the following path: been traced hereinbefore. Relay 369, in closing ground, contact 452, conductor 377, contact 365, contact, 365, relay 320, in maintaining contact contact 33, through relay 30 to battery. Re 32 closed for a short time (relay 320 being of the lay 30, in closing contact 32 applies refund po slow-to-release type), and relay 450, in closing tential back out over the line -Li to refund the contact 65, together cause relay 3 f to operate, coins. Relay 342, in closing contact 345 when over the following path: ground, contacts 45, collecting, or relay 330, in closing contact 332 conductor 3, 4, contact 365, contact 32, through when refunding will cause slow-to-release relay relay 3 to battery. Relay 39, in closing con 350 to operate, traced over the i?ollowing path: tact 32, will cause -110 V. refund potential to ground, contact 452, conductor 377, contact 365, go out back over line-T to operate coin magnet contact 345 or 332, through relay 35) to battery. 2 and refund the dine or quarter. The repeater Thus, it will be seen that relay 359 operates only must be switched through before refund poten when coin disposal is handled by the operator tial is applied to line - . This correct sequence and also that either a manual refund Or collection of operations is effected by fast acting relay 36 will operate said relay 350. Relay 350, in closing operating before slow-to-operate relay 30. 30 contacts 352 and 355, prepares the path to relay Slow-to-release relay 32 finally restores open 469. Upon the return of either the manual col ing the circuit to relay 39 at contact 32.. Thus, lect or refund key by the operator, relay 3 (0 or it will be seen that the initial coin is refunded to 349 will restore, circuits for which have been the party at paystation A as soon as the operator traced hereinbefore, and also, slow-to-release re answers and before any conversation takes place. 35 lay 35 will restore after a delay, circuit for which It will also be seen that relay 42 will finally re also has been traced hereinbefore. If the coin or store and open the circuit to the cord disconnect coins have not been properly disposed of, coin lamp at approximately the same time that relay springs 3 will not reset to a normally opened 323 restores and renoves refund potentiai from position. Thus, for the short time relay 350 line -u. This nakes it possible for the operator 40 remains operated after relay 310 or 340 re to use the ceasing of the flashing of the discon store, a circuit will be coiniplete to oper rect anp as the means for knowing When to ate relay 460, traced over the following path: Speak to the party at payStation A. If the oper ground at payStation A, through coin magnets ator should become doubtful of the type of line 2, coin Springs 3, Out over line -L and the re after she has started conversing she can ascer peater, selector wiper -Li, selector bank contact tain it by temporarily removing the plug. Re -L, contacts 39 f, 3 , 341, 352, conductor 38, moving the plug will open the circuit to relay conductor 43, plug sleeve 478, through relay 460 48 at contact 482. Relay 4 will thus restore, to battery. Relay 469, in closing contact 462 but relay it will remain operated over a new locks itself operated over the following path: path: ground, contact 435, contact 47, through ground, contacts 472, 474, 462, through relay 460 relay 488 to battery. Relay 4 3 in restoring and to battery. Relay 460 also, in closing contacts closing contact is will cause slow-to-release re 46, illuminates lamp L6. Thus, it will be seen lay 42 to operate, circuit for which has been that failure of coin refunding or collecting-i. e. traced hereinbefore. Now, if the operator re-in maintaining ground on line -Li Will cause a Sig serts the plug relay &A will once again operate nal lamp to so indicate. The operator could then as hereinbefore explained, and open the circuit repeat the manual operation until the coins are to Irelay 32, but the circuit to flash to the cord disconnect lamp, also hereinbefore explained, will dislodged.It will now be assumed that- a party at a Sub be complete until relay 62 finally restores and station B on a regular line Wishes to communi opens contact 424. Thus, the operator Will see 60 cate with the operator. Upon dialing in the a flashing disconnect lamp once again for a short usual manner the regular line Will be extended time if the party is at a payStation. to the CLR trunk and relays A450, 639 and 42) The operator can now handle the call fron will operate exactly as hereinbefore explained. payStation A in the usual manner. The operator However as a regular line Will access this CTR can also collect or refund coins manually at any trunk from a three wiper selector (i.e. no EC), time. There is a separate cord as shown in the no ground will be available to operate relay 450. lower right hand portion of Fig. 5, associated with This can be seen in Fig. 3. Thus, relay 329 will each operator's position. This collect-refund not operate. The result is that the call signal cord circuit, has only standard switchboard talk lamp will illuminate continuously, indicating to ing voltage pass through rather than the higher 70 the operator that a regular line Substation is coin collect-refund voltages. By inserting this calling. The circuit for the call signal lamp will collect-refund plug into the jack aSSociated With now be traced over the following path: ground, the CLR trunk concerned, the operator can dis contacts 453, 434, 533, through call signal lamp pose of coins by operating either the refund key L5 to battery. The operator plugs in and causes or the collect key. ASSuming that the operator 75 the operation of relays 40, 400, and 360 in ex wishes to collect manually and pushes the col 3 2,673,248 actly the same manner as hereinbefore ex 14 plained. However, relay 3 will not operate ated by said line relay for transmitting switch and automatically causes refund potential to be controlling pulses from Said repeater to Said applied to line -L, as was the case in payStation seized selector, means for normally supplying service. Relay 3 is prevented from operating dial tone to said repeater from Said selector, a at open contact 32. As relay is operates and 5 repeating coil in said repeater, shunting means before relay 42 restores, the cord disconnect in said repeater, said shunting means shunting lamp will illuminate, as hereinbefore explained. said repeating coil and said pulsing contacts and However, this time the lamp will receive steady maintaining said shunts only in case a coin of ground to illuminate continuously traced over non-acceptable denomination has been deposited the following path: ground, contacts 453, 438, O in said hopper at Said calling payStation and said 405, 424, 433, jack sleeve S, plug sleeve S, through coin trigger is unoperated, whereby the trans cord disconnect lamp I. to battery. The opera mission of said dial tone from said repeater to tor then handles the call in the Sual nanner. said calling paystation and the transmission of The operator knows that no coin service is re said switch controlling pulses from Said repeater quired on this call from a regular substation line to said seized selector are respectively prevented. but if she inadvertently attempts to give Such 3. An autornatic telephone System. Such as service, relay 45, not being operated will open claimed in claim 2, wherein said coin hopper the manual collect and refund circuits, as here comprises two coin channels, one of said chan inbefore traced, at contacts 455 and 456, respec nels being for said deposited non-acceptable tively. 20 coins and the other of said channels being for Having described my invention in detail, what deposited acceptable coins, and Said coin trigger I claim and desire to be protected by an issuance being so disposed as to project only into Said of Letters Patent of the United States is: other coin channel. 1. In an automatic telephone system, a pay 4. An automatic telephone systein. Such as station including a calling device, a coin disposal 25 claimed in claim 2, including a source of ground means and a coin hopper, a coin trigger aSSociat potential associated with said coin trigger, a dif ed. With Said hopper and said coin disposal ferential relay in said repeater, an operating cir means, said coin trigger operated only by de cuit, for said differential relay, means operated posited acceptable denominations of coins and by said coin trigger in case a coin of an accep unoperated by deposited non-acceptable denotini 30 table denomination has been deposited in said nations of coins, a finder-repeater-selector link hopper at said calling payStation to apply said accessible to Said paystation, a hookswitch at ground potential to said differential relay oper said payStation, means operated by said hook atting circuit for operating said differential relay, switch when said payStation is calling for ini and means operated by said operation of said tiating the operation of said finder and associ 35 differential relay for Operating said shunting ated link to find and seize said paystation, means means to remove said shunts from said repeating for transmitting dial tone to said repeater from coil and Said pulsing contacts, whereby dial tone Said Selector, a repeating coil in said repeater, is effectively transmitted from said repeater to shunting means in said repeater, said shunting said calling payStation and said Switch control means normally shunting said repeating coil and 40 ling pulses are effectively transmitted from said maintaining said shunt in case a coin of non-a,c- repeater to said seized selector respectively. ceptable denomination has been deposited in said 5. An automatic telephone system such as hopper of said calling payStation and said coin claimed in claim. 4, including coin disposal trigger is unoperated, whereby the transmission means, means for operating said coin disposal of said dial tone from Said repeater to said call 45 means, and means operated by said line relay for ing paystation is prevented, a line relay in said operating said last-mentioned means to operate repeater, means for operating said line relay said coin disposal means to refund said deposited When said calling device is operated at said call non-acceptable coin immediately subsequent to ing payStation, means for operating said coin the dialling of the first digit of a desired call disposal means, and means operated by said line 50 number. relay for Operating said last-mentioned means to refund said deposited non-acceptable coins in 6. An automatic telephone system such as mediately subsequent to the dialling of the first claimed in claim 5, including means operated up digit of a desired call number. on completion of a call, and subsequent to said 2. In an automatic telephone System, a pay hookSwitch being restored to normal, for oper station having a calling device and a coin hop 55 atting said coin disposal operating means, said per, a coin trigger associated with said hopper, coin disposal means thereby operated to collect Said coin trigger operated only by deposited ac said deposited acceptable coin. ceptable denominations of coins and unoperated by deposited non-acceptable denominations of CLARENCE E. LOMAX. coins, a finder-repeater-selector link accessible 60 to said paystation, a hookswitch at said paysta References Cited in the file of this patent tion, means operated by said hookSwitch. When UNITED STATES PATENTS Said payStation is calling for initiating the oper Number Name Date ation of said finder to find and seize said paysta 1,200,788 Williams ------Oct. 10, 1916 tion, a line relay in said repeater, means for op 1,722,351 Quass ------July 30, 1929 erating Said line relay when said paystation is 1,859.885 Paine ------May 24, 1932 Seized, means operated by said operation of said 1924,095 Griffins ------Aug. 29, 1933 line relay for seizing said selector, means asso 2,248,575 Lomax ------July 8, 1941 ciated with said calling device for pulsing said 2,271,681 Davidson ------Feb. 3, 1942 line relay when said calling device is operated at 2,372,262 Edwards ------Mar. 27, 1945 Said calling payStation, pulsing contacts oper 2,471,087 Anderson ------May 24, 1949 2,509,477 Carson et al. ------May 30, 1950