US1491339A - Pay-station automatic telephone system - Google Patents

Description

April 22 v 1924' R. D. CONWAY PAY STATION AUTOMATIC TELEPHONE SYSTEM Filed MaIGh 23 1921 2 Sheets-Sheet l Hayfl Conway 1,491,339 Apn] 22 1924 R. D. CONWAY PAY STATION AUTOMATIC TELEPHONE SYSTEM Filed March 23. 1921 2 Sheets-Sheet 2 EU k3d h *3 r =5 l' *T I Y V J E L a x @g P P 1% w W &

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ROY I). CONWAY, OIE CHATHAM NEW 5 COMPANY, INCORPORATED, OF NEW YORK,

PAY-STATION AUTDMA ERSEY, ASSIGNOR T0 FIESTERN ELECTRIC N. ll". A CORYORATION GE NEW YORK.

TIC TELEPHon'E sYsrnia.

Application filed March 23, 1921. Serial 1E0. 12.

T0 cZZ whom it may concern Be it known that T, ROY D. CONWAY, a citizen of United States, residing at l'lillside Avenue, Chathani, in the county of Morris, State of New Jersey, have invented certain new and useful Improvements in Paywtaition Automatic Telephone Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to machine switcln ing pay station telephone systems andlis an improvement on the system disclosed and claimed in my application for Letters Patent tiled Aug. 11, 1920, Serial No. -il02,760. for coin collect systems for automatic telephone exchanges.

in the circuit arrangement of this invention the removal ot the receiver causes automatic means to extend the calling line to a trunk terminating in a lirst selector but the subscriber cannot set the same due to the impulse circuit being normally disabled at the central ottice. A relay at the central oliice is now intermittently operated to open the connection of the calling line with the trunl i and connect a test. relay to the calling line to test. for a ground caused by the deposit of the coin in the coin box. The relay which opens the connection of the calling; line with the trunk simultaneously closes a bridge tluereacrossto hold operated the linerelay oi the first selector in order to prevent the automatic line switch from releasing prematurely, this switch being held operated by a ground applied to its "holding winding from the slow relay at the first selector.

The presence of the ground due to the deposit of the coin operates the test relay which causes means to be actuated to connect an impulse relay to the calling line. This relay is now in circuit with the dial of the calling line and is operated by the dial to transmit impulses to the impulse relays oi thenumerical switches to build up the connection. The response of the called party prepares ,a circuit to apply current of a certain polarit to the calling line to operate the polarized magnet in the coin. box to collect the deposited coin, which circuit is closed upon'the replacement of the receiver by the calling party. The failure of the called party to answer prepares a circuit to apply current of the opposite polarity to the calling; line to operate the said polarized magnet to refund the coin, which circuit is closed upon the replacement of the receiver by the calling party.

Referring to the drawings, shows a calling line, line switch and the coin control circuit, Fig. 2 shows a secondaryliue switch, a first called line. 1 p

The invention will be most readily understood from a detailed description of the operation of the system.

The removal of the receiver at substation A operates the line relav 100 of the wellknown Keith line switch which closes thec'ircuit of the pull down winding 101 to cause the line switch to plunge and seize the preselected trunk 102, 10?}, as scribed for example in Patent 1510. 1,305,369 of May 20, 1919, to It. J. Ray. The-closure of contact 10%- applies ground to holding (30l1 ductor 10-3 leading to the-pull down coil 200 of the secondary line switch SL8 causing such switch to seize a preselected 'tirst selector F .in the well-known manner. This selector may he of the type shown in reissue Patent No. 13,901, issued Apr; 13, 1915, to F. Newiforth, The seizure of the selector causes a ground to he applied to the rcleusewirc 201 in the well-known manner. These two line switches thus have extended the, calling line to the first selector F51. The ground applied to the releasewire 201 operates rel this circuit including the inner right arnnr ture of relay Y. Tie-lay S in attracting its inner right armature applies ground to the conductor 10? leading to the holding wind- 108 of the primary line switch and also operates slow relay 11 which applies another ground to this wire. Relay S in operating connects.interrupting machine 109 to relay A to operate the same to intermittently connect test relay L to the tip and ring of the calling line to test for the presence of the coin inthe coin box. This coin box may he oi? the type shown in Patent No. 1,043,219, Nov. 5, 1912,to O. ll. Forsherex wherein the deposit of the coin hy closing contact 110 connects the polarized magnet 111 to ground from the tip side 121 of the line. The circuit for relay A is as follows: tree pole oi battery, relay 112, relay A, conductor 113, outer le'it armature and front contact of re- .lay S, upperi'nost armature and hackcontact of relay C, outer left armature and normal contact of relay E, conductor 151, interrupter .109 to ground. ltelay A upon its energizeselector, a connector and the shown and tie till tion connects bridges 157, 158 across the trunk 136, 137 to hold operated the impulse relay of the first selector to prevent premature release and connects test relay L to the tip and ring conductors in parallel to the coin ground, the circuit being as follows: free pole of battery, inner right armature and back contact of relay E, resistance 115, outer left armature and normal contact of relay Y, inner left armature and front con tact of relay S, relay L, ring conductor 116, lowermost armature and front contact of relay A, conductor 103, contact 117, ring conductor 118 through the receiver hook and transmitter, contact 110, polarized magnet 111 to ground.

The path over the tip side may be traced from conductor 116 through the outer right normal contact of relay E, tip conductor 119, uppermost armature and front contact of relay A, conductor 102, contact 120, tip conductor 121, contact 110, polarized magnet 111 to ground. Relay L in attracting its armature operates relay E, this circuit including the outer right armature and normal contact of relay B, conductor 122, armature and front contact of relay L to round at the inner right armature of relay Relay E in attracting its outer left armature disconnects the relay A from the interrupter 109 and closes the following circuit to hold relay A operated; free pole of battery, relay 112, conductor 123, relay A, its armature 124 and front contact, conductor 125, uppermost armature and back contact of relay (1, conductor 126, contact 152 of relay E, conductors 128, 153, inner right armature of relay Y, conductor 129 to grounded release wire 106. Relay E in attracting its inner left armature locks itself by way of conductor 128 to grounded conductor 106. In attracting its inner right armature relay E disconnects relay L from the trunk conductors 116, 119, and in attracting its outer right armature connects the impulse relay I to the ring side of the line, and a retardation coil 129 to the tip side. Relay I now energizes over the calling line circuit and operates relay D which in turn operates relay DD. Relay B operates due to the operation of relays I and D and locks to ground at the armature and front contact of relay H. The calling subscriber now operates hisdial 130 which causes the impulse relay I at its left armature to open and close the circuit including the impulse relay at the first selector to cause the same to step the switch up to the desired level in the well-known manner. whereupon it automatically hunts for an idle trunk terminating in a connector C Upon the first retraction of the rightarma-tures of relay I, re lays D and DD release, relay D'D disconnesting the condensers 131, 132 from the outgoing tip and ring conductors to prevent their discharge from interfering With the character of the impulses. The relay D is a slow to operate relay as shown, and does not attract its armature during the transmission of the impulses. When the selector FS finds and seizes an idle connector C the relay operates over the calling line circuit in the well-known manner operating the slow relay 203, which in attracting its left armature applies ground to the release wire 2-01, and at its right armature opens the circuit of the release magnet 206 of the connector. The calling party now operates his dial to transmit the tens and units impulses to set said connector C on the called line in the well-known manner, whereupon the line if idle is rung. Upon the response of the called party the relay 205 operates reversing the direction of the current flow in the trunk circuit which operates the polarized relay P in the coin con trol circuit, Fig. 1. Relay P operates relays J and C, the circuit of relay J including its normal left contact, the alternate contact of relay P to grounded conductor 134:, and the circuit of relay C including the normal contact of relay J to ground over the circuit traced for relay J. The right armatures of relay J are so arranged that they operate and shift their contacts before the left armature of said relay closes its front contact. Thus the current in the trunk is reversed and relay P again operates to open its contact before the relay J can close its lef' front contact. Relay J in operating locks to the grounded conductor 134. Relay in attracting its armature 135 loclrs to said grounded conductor. At its uppermost armature it opens the locking circuit of relay A. which connects the calling line through to the tip and ring trunk conductors 136, 13? cutting off the impulse relay bridge. Current is now fed to the calling line through the windings of relay 204:. Relay (.7 in attracting its armature 138 prepares a circuit from the collect source CC. Talking current is fed to the called line over the windings of relay 205.

The connection is broken down by the replacement ofthe receiver by the calling party. and the coin is collected automatically at thi time. The opening of the calling line circuit releases relay 204 which releases slow relav 203 which at its right armature closes the connector release magnet (ircuit and by opening its left contact removes ground from the release wires 207. 201.. 106 c using the release of the first selector and relay S. Fig. 1. Relay S in retractino' its outer right armature operates relay Y over the following circuit: free pole of battery. relay Y. conductor 139. outer c'ht arm ture and back con act of relay 5 nner ght armature and front contact of relay B, conductor 140 to ground at the front contact of relay H. Relay Y in attracting its outer right armature opens the circuit of holding conductor 141 which causes the release of the secondary line switch SL5. Relay H is slow to release and when its circuit leading over conductor 142 is opened by the retraction of the inner right armature of relay S, a substitute circuit 'is closed for said relay leading over the armature 143 and normal contact of re lay A, outer right armature and front contact of relay B, conductor 144, contact 145 of relay Y, conductor 105 to ground at the contact 104 of the primary line switch. Relay Y in closing its contact 148 locks itself to the grounded conductor 134. In attracting its inner right armature it connects the interrupter 109 to the relay S to intermittently operate the same. The first operation of relay S operates relay A, this circuit including relay 112, conductor 123, relay A, conductor 113, outer left armature and front contact of relay 8, inner left armature and front contact of relay Y, grounded conductor 134. Relay A in attracting its armature 124 locks over conductor 125 to said grounded conductor, and prepares a circuit for connecting the collect source CC to the calling line to collect the coin. The next retraction of the inner left armature of relay S as the machine 109 reaches an insulated segment causes current of 110 volts positive potential to be transmitted from the collect source CC over the armature and trout contact of relay C, conductor 150, inner left armature and back contact of relay 3, relay L, conductor 116, in parallel over the tip and ring conductors to ground through the polarized magnet 111 in the coin box these paths being the same as those traced when relay L tested for the presence of the coin. This current operates the polarized magnet 111 in the proper dire-tion to collect the coin. If the magnet 'lunctions properly, upon the operation of relay Fl and the consequent interruption of the collect current. magnet 111 releases causinp the opening of contact 110 as described in detail in said Forsberg patent, thus removing the polarized magnet from the tip side of the line. llhe relay L operated in the coin current circuit and closed the following substitute circuit for relay H when the circuit for said relay leading over the armature 143 and ba k contact of relay A w s broken This circuit is as follows: battery. relav H. conduct-or 142, front contact of re ay Ti. conductors and 144, contact 145. conductor 1105. contact 104 to ground. \l'hcn the relav Fl next retracts its armature to close the coin current circuit if the maget 111 has collected the coin and opened he contact 110. relay L fails to operate and t e substitute circuit for relay H is not closed whereupon the same releases, its

armature opening the circuit of the holding winding 108 to release the line switch. The function of lamp 154 is to inform an attendant by its sustained illumination that the circuit is not functioning properly.

If the called subscriber does not respond or the line is busy there would be no reversal of the current in the calling line circult, and the relay P would fail to operate. Relay C is thus not locked up and upon the replacement of the receiver negative current of110 volts potential is supplied from the refund source RC to operate the magnet 110 to refund the coin. The relay L tune tions to hold the line switch set if the coin is not collected on the first impulse in the same manner as described in the case of a suc-esst'ul call.

Free lines are segregated on connectors with talking current over the windings of.

the impulse relay 1, the circuit being balanced by the retard coil 1529. Relay DD connects trunk conductors 116 and 119 to the outgoing tip and ring conductors, the condensers 131. 132 conductivcly separating the calling and called ends in accordance with well-known practice. When the calling party restores his receiver the coin control circuit of Fig. 1 functions to refund the coin as described in case the called party did not answer or the line was busy.

' The function of the left front contact of relay J is to prevent the possibility of falsely holding the switches set if the called subscriber restores his receiver first In the arrangement of Fig. 1 when the called party replaces his receiver the polarized relay P closes its contact, due to the reversal of the current and shunts out relay J which releases, in turn restoring the original connections between the talking conductors of Figs. 1 and 2, and since then the ground at the coin box is connected to the upper talking conductor to which the grounded side of relay 204 is connected, there is no possibility of relay 204 remaining energized from the coin ground and preventing release by holding release relay 203 operated.

What is claimed is:

1. In a machine switching telephone sys tom, the combination with telephone lines, automatic numerical switches for intercon necting the same, a coin collector at the calling station having a magnet to collect or re fund a' deposited coin, means operated by the deposit of a coin and the removal of the receiver at the calling station for connecting both sides of the calling line to ground through said magnet, means automatically operated by the removal of the receiver at the receiver at the the calling station for extending the calling line to the first of said numerical switches, a normally inoperative impulse circuit for setting said switches including the calling line, a test relay, a circuit therefor including both sides of the calling linein parallel to said ground, means actuated by said relay "for rendering said impulse circuit operative, and a sender associated with the calling line for controlling said impulse circuit to set said switches.

2. In a machine switching telephone sys tom, the combination. with telephone lines, automatic numerical switches for intercon necting the same, a coin collector at the calling station having a magnet to collect or refund a deposited coin, means operated by the deposit of a coin and the removal of calling station for con necting both sides of the calling line to ground through said magnet, means auto matically operated by the removal of the receiver at the calling station for extending the calling line to the first of said numerical switches, a noin'ially inoperative impulse circuit including the calling line, a test relay, a circuit therefor including both sides of the calling line in parallel to said ground, means actuated by said relay for rendering said impulse circuit operative, a sender associated with the calling line for controlling said impulse circuit to set said switches, sources of current of different character at the central ofi'ice, and means operated upon the breaking down of the connection and dependent upon whether or not the called party has responded for impressing current from the proper source to operate said magnet to collect or refund the coin.

3. In a machine switching tele hone system, the combination with telep ione lines, connecting circuits including automatic numeri-cal switches for interconnecting the same, a coin collector at the calling station having a polarized magnet to collect or refund the deposited coin, means operated by the deposit of the coin and the removal of the receiver at the calling station for connecting both sides of the calling line to ground through said magnet, means automadcally operated by the removal of the receive-i. at the calling station for extending the calling; line to an idle connecting circuit, an impulse relay normally disconnected from said connecting circuit, a test relay, a circuit therefor including both sides of the calling line in parallel to said ground, means operated by said relay for connecting said impulse relay to said connecting circuit, and a sender associated with the calling station for controlling said impulse relay to set said switches.

l. In a machine switching telephone system, the combination with telephone lines, conn sting circuits including automatic numerical switches for interconnecting the same, a coin collector at the calling station having a polarized magnet to collect or refund the deposited coin, means operated by the dcposit oi the coin and the removal of the receiver at the calling station for connecting both sides of the calling line to ground through said magnet, means autoinatically operated by the removal of the receiver at the calling station for eXtending the calling line to an idle connecting circuit, an impulse relay normally disconuected from said connecting circuit, a test relay, a circuit therefor including both sides of the calling line in parallel to said ground, means operated by said relay for connect ing said impulse relay to said connecting circuit, a sender associated with the calling station for controlling said impulse relay to set said switches, sources oi current of diflercnt polarity at the central 056cc, and cleans operated upon the breaking down of the connection and depending upon whether or not the ca led party has responded for impressing current from the proper source to operate the polarized magnet to collect or refund the coin.

5. In a machine switching telephone system, the combination with telephone lines, connecting circuits including automatic numerical switches for interconnecting the same, a coin collector at the calling station having a polarized magnet to collect or re fund the deposited coin, means operated by the deposit of the coin and the removal of the receiver at the calling station for connecting both sides of the calling line to ground through said magnet, means automatically operated by the removal of the receiver at the calling station for extending the callin line to an idle connecting circuit, an impulse relay normally disconnected from said connecting circuit, a test relay, a circuit therefor including both sides of the calling line in parallel to said ground, means operated by said relay for connecting said in'ipulse relay to said connecting circuit, a sender associated with the calling station for controlling said impulse relay to set said switches, sources 01" current of opposite polarity at the central ottice, means controlled by tore calling party for initiating the release of the connection, means for delaying the release and auton'iatically applying positive or negative current from the corresponding source to said polarized magnet to collect or refund the coin dependent upon whether or not the called party has answered, and means for complcting the release of the connection when the polarized magnet operates to dispose of the coin.

(1. in a machine switching telephone system, the combination with telephone lines, connecting circuits including automatic numerical switches for connecting the same, a coin collector at the calling station having a polarized magnet to collect or refund the deposited coin, means operated by the deposit of the coin and the removal of the receiver at the calling station for connecting both sides of the calling line to ground through said magnet, means automatically operated by the removal of the receiver at the calling station for extending the calling line to an ,idle connecting circuit, a test relay, an impulse relay disconnected from the connecting circuit, a relay operated upon the extension of the calling line to the connecting circuit to open the connection of the ailing line with the connecting circuit and extend the line to said test relay, said test relay operating in a circuit including the sides of the calling line in parallel and said ground to connect said impulse relay in circuit with the calling line, a sender associated with the calling line for operating said impulse relay to set said switches, means operated by the response of the called party for disconnecting said impulse relay and test relay from the calling line and for extending the calling line to the connector,

and means for supplying talking current to the calling and called lines from the connector.

7. In a machine switching telephone systom, the combination with telephone lines, connecting circuits including automatic numerical switches for connecting the same, a coin collector at the calling station having a polarized magnet to collect or refund the depositedcoin, means operated by the deposit of the coin and the removal of the receiver at the calling station for connecting both sides of the calling line to ground through said magnet, means automatically operated by the removal of the receiver at the calling station for extending the calling line to an idle connecting circuit, a test relay, an impulse relay disconnected from the connecting circuit, a relay operated upon the extension of the callingline to the connecting circuit to open the connection of the calling line with the connecting circuit and extend the line to said test relay said test relay operating in a circuit including the sides of thecalling line in parallel and said ground to connect said impulse relay in circuit with the calling line, a sender associated with the calling line for operating said impulse relay to set said switches, means operated by the response of the called party for disconnecting said impulse relay and test relay from the calling line and for extending the calling line to the connector, means "for supolying talking current to the calling and called lines from the connector, sources of current of different polarity, and means operated upon the breaking down of the connection and depending upon whether or not calling line to operate t e coin magnet to collect or refund the coin.

8. In a machine switching telephone system, the combination with telephone lines. connecting circuits including automatic numerical switches for connecting the same, a coin collector at the calling station having a polarized magnet to collect or refund the deposited coin, means operated by the deposit of the coin and the removal of the receiver at the calling station for connect ing both sides of the calling line to ground through said magnet, means automatically operated by the removal of the receiver at the callingstation for extending the callin line to an idle connecting circuit, a test relay, an impulse relay disconnected from the connecting circuit, a. relay operated upon the extension of the calling line to the connecting circuit to open the connection of the calling line with the connecting circuit and extend the line to said test relay, said test relay operating'in a circuitincluding the sides of the calling line in parallel and said ground to connect said impulse relay in circuit with the calling line, a sender associated with the calling line for operating said impulse relay to-set said switches, said impulse relay remaining connected to the calling line when certain lines are called to supply talking current to the callingline, and means for supplying talking current to the called line from the connector.

9. In a machine switching tem, the combination with telephone lines, automatic numerical switches for interconnect-ing the same including a first selector, a coin collector at the calling station having a magnet to collect or refund a. deposited coin, an automatic line switch operated by the removal of the receiver at the calling station for extending the calling line to the first selector, a holding circuit for said line switch controlled by the line relay of the first selector, means operated by the deposit of a coin for grounding the calling line, a test relay adapted to operate in a circuit including said ground, means for disconnecting said first selector from the calling line and substituting said test relay therefor and for simultaneously closing a bridge to maintain said first selector line relay operated, an impulse relay for setting said numerical switches, means responsive to the operation of said test relay for connecting said impulse relay in operative relation to the calling line, and means for automatically applying current to said magnet to collect the deposited coin.

10. In a machine switching telephone system, the combination with telephone lines,

telephone sys automatic numerical switches for interconnecting the same including a first selector, a coin collector at the calling station having a magnet to collect or refund a deposited coin, an automatic line switch operated by the removal of the receiver at the calling station for extending the calling line to the first selector, a holding circuit for said line switch controlled by the line relay of the first selector, means operated by the deposit Off a coin for grounding the calling line, a test relay adapted to operate in a circuit including said ground, means operated upon the extension of the calling line to the first selector for intermittently disconnecting said first selector line relay from the calling line and substituting said test relay therefor and for simultaneously closing a bridge to maintain said first selector line relay operated, an impulse relay for setting said numerical switches, means responsive to the operation of said test relay ior connecting said impulse relay in operative relation to the calling line where the calling party may set the switches, and means for applying current to said magnet operated upon the breaking down of the connector to collect or refund the coin.

11, In a machine switching telephone system, the combination with telephone lines, automatic numerical switches for interconnecting the same including a first selector, a coin collector at the calling station having a magnet to collect or refund a deposited coin, an automatic switch operated by the removal of the receiver at the calling station for extending the calling line to the first selector, a holding circuit for said switch controlled by the line relay of the first selector, means actuated by the deposit of a coin for efiecting a circuit change in the calling line, a test relay operated thereby, means for automatically periodically disconnecting said first selector line relay from said calling line and for substituting said test relay and for simultaneously closing a bridge to maintain said first selector line relay operated, an impulse relay for setting said numerical switches, and means responsive to the operation of said test relay for connecting said impulse relay in operative relation to the calling line, and means for automatically applying current to said magnet to dispose of the deposited coin.

12. In a telephone system, a. calling line, a sender and call charging mechanism at the substation thereof, a central otfice in which said line terminates, an automatic numerical switch thereat, an impulse circuit for setting said switch, means actuated by the initiation of a call for extending the calling line to said switch, means operated by the actuation of said call charging mechanism for altering the substation circuit, a test relay at the central oifice responsive to such alteration for placing said impulse circuit under the control of the substation sender, a bridge, means for automatically disconnecting said switch from the calling line and for connecting said test relay thereto and for simultaneously connecting said bridge to said switch, said test relay in operating in response to such alteration permanently disconnecting said bridge, and means for subsequently applying current to said call charging mechanism to operate the same.

In witness whereof, I hereunto subscribe my name this 15th day of March, A. D. 1921 ROY D. CON'WAY.

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