US1462719A - Measured-service-telephone system - Google Patents

Description

July 24, 1923- W. W. OWEN MEASURED SERVICE TELEPHONE SYSTEM Original Filed June 14, 1919 Patented July 24, 1923.

warren stares WILLIAM WALTER OWEN, OF OAK PARK, ILLINOIS, ASSIGNOR T0 AUTOMATIC ELEG- TBICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

IllEASURED-SERVICE-TELEPI-IONE SYSTEM.

Application filed June 14, 1919, Serial No. 304,245. Renewed March 24, 1923.

America, and a resident of Oak Park, in the county of Cook and State of Illinois,-

have invented certain new and useful Improvements in Measured Service-Telephone Systems, of which the following is a specification.

proved measured service telephone system and more specifically to a means for automatically controlling a coin collecting device such as that shown and described in U. S. Letters Patent No. 1,043,219, granted Nov. 5, 1912. to O. F. Forsberg.

The principal object of my invention is i to provide improved circuit arrangements and devices to be used in an automatic tele phone system where it is desired to use a pay station such as that shown in the above mentioned patent or any other similar type. i In this way a subscriber may be provided with a coin collector, in which a coin collecting and refunding magnet is connected to the line circuit when a coin is deposited and in which a calling device is provided at the telephone to control a series of automatic switches to automatically extend a talking connection either to another subscriber or to an operator. It is to be understood that a telephone such as I have shown may be called directly through jack from an operators cord circuit if desired.

Further objects of my invention are to provide a simple circuit arrangement which is automatically controlled by the joint operations of a calling and a called subscriber to connect either a positive or a negative high potential battery to the talking circuit to collect or refund a coin to a calling sub-- scriber. Further details and features of my invention will be pointed out in the detailed description following.

In the accompanying figure of drawing I have shown a calling substation A equipped with a receiver and transmitter of the usual type, together with an automatic calling de vice and a coin controlling magnet 2 which is adapted to be connected to one side of the line circuit by means of a pair of springs 3 and 4: which are closed by a coin when such coin is deposited in the chute. The coin also opens the springs 4 and 5 to remove a short circuit from around the springs The magnet 2 is of such resistance that it will not operate when normal battery current, such as is used to operate the switches, flows in the talking circuit and is also of high enough resistance to prevent an improper shunting of the talking currents. My invention relates in general to an 1m- At C I have shown a rotary line switch individual to the subscribers line of well known type in which the wipers normally stand upon the contacts of the trunk line last used.

Associated with the line switch C and individual to the line A are a pair of relays 6 and 7 which conjointly control the operation of the coin collect magnet 2.

At D I have shown the essential elements of a connector switch of the wellknown Strowger vertical and rotary type with certain modifications to adapt it more read ily to my invention. i

lVhen a subscriber at A removes his receiver to initiate a call a coin is firstdeposited, either before or after the receiver is removed, to remove the short circuit from the calling device at springs 4t and 5 and to close springs 3 and 4: to connect the marginal polarized magnet 2 to the talking circuit. As soon as the receiver is lifted a circuit is closed for the line relay 8 of line switch C in series with the talking equipment of the line A.

Relay 8 operates to close a series circuit through relay 9 and rotary magnet 10 at springs 1]. and also closes a short circuit about relay 9 at springs 12. Now if the trunk before which the wipers of the switch C are standing is busy and ground is present on the private or test contact thereof then the magnet 10 will be energized over a circuit extending from ground through the private wiper through springs 13 and 14:, springs 12 and magnet 10 and its interrupter springsto battery thus short circuiting relay 9. Magnet 10 operates in the manner of a buzzer to rotate the'wipers of the switch C onto thenext trunk line and continues its operation until an idle trunkline is reached upon which there is no guarding ground. At this time the previously closed series circuit of relay 9 and magnet 10 becomes effective and relay 9 energizes. Relay 9 being of comparatively high resistance energized by current flowing in the same di rection. After its armatures are once attracted however the left hand winding is of sufficient strength to maintain the said armatures in their attracted position. lay 9 also closes a holding circuit for itself through springs 13 and 1.7 which will later be supplied with ground from the switch ahead. A still further result of the energization of relay 9 is the momentary closing in contact of springs 18, 19 and 20, and as the relay completes its stroke the springs 19 and 20 are held open. The closure of these three springs at this time has no effect as relay 8, being slow acting has not yet allowed the springs 21 to close contact.

- W hen the line circuit is thus cut through to the wipers 15 and 16 a circuit is com- 31 and 32, springs 33 and 49, right hand winding of relay 7 wiper 15, springs 35 and 36, and upper winding of relay 22 to battery. The current flowing in the right hand winding of relay 7 at this time is in such a direction a s to set up a magnetic flux in opposition to that caused by the current in the left hand winding so that relay 7 does not energize. Relays 22 and 23, however, encrgize over this circuit. Relay 22 opens the s r ngs 37 and relay 23 closes the springs 38 n the circuit of the slow release relay Relay 39 energizes to supply ground to the holding ci cu t of switch establishes a guarding ground at the'multiple private test contacts of the switch D. opens the circuit of the release magnet at springs 40 and 41 and prepares a circuit at springs 42 for the series relay 43 and vertical magnet 44. It will be understood that I have shown only a portion of the circuits of the connector D but a further disclosure will be unnecessary as such switches'are well known in the art and comprise in addition to the parts here showma rotary magnet. busy relay, ringing equi-pemenhetc. Also this connector D has direct access to the lines of the'system and the line relay 22 is operated in response to the digits of the called number to first control the vertical magnet and then the rotary magnet to seize the called line, after which theline is signalled. When the called subscriber answers by removinghisreceive'r a circuit is completed for the back bridge or reversing relay 26, which energizes in series with the called line and operates to reverse the connections of theline relays 22 and 23 with regard to the talking circuit. This causes a reversal of the current flowing over said talking circuit to the calling line and therefore through the right hand winding of the relay 7 i Relay 7 now attracts its armatures due to the :umulative effect of both windings and short circuits its right hand winding through springs 45 to provide a clear talking circuit and also to prevent further variations of current from affecting the relay. Relay 7 also closes the springs 46 and 47 to prepare a circuit from the positive high voltage battery M. Relay 7 is held in this position by the action of its left hand winding during conversation, and the subscribers may now converse over the heavy conductors shown.

When conversation is completed the calling subscriber initiates the release of the connection by restoring his receiver to the switch hookand thereby opening the line circuit and the circuit of line relays 22 and 23 of the connector D.

Relay 23 upon deenergizing opens the circuit of release relay 39, which removes ground from the holding circuit of relay 9 of the switch C and closes the circuit of the release magnet 51 of the switch D. The connector D is therefole restored to normal and the relay 9 of the switch C falls back to restore the line switch to normal. As relay 9 falls back it momentarily closes the springs 18, 19 and 20 in contact. In this case a circuit is completed for the slow relay 6 through springs 21. relay 8 being deenergized. Springs 50 are the last to open contact so that springs 52 may close before springs 50 open to hold relay 7 energized. As relay 6 energizes it disconnects the line A from all. connection with the relays of switch C and also closes a circuit from the positive high voltage battery M through springs 46 and 47, springs 53 and 30, springs would notbe energized to reverse the battery and therefore relay 7 of the calling line would not be energized. In this case when the calling subscriber hangs up his receiver to release the connection all the operations will be the same, that is, the connector ,of such a direction as to operate magnet 2 to direct the deposited coin into a refund chute whereiit can be recovered by the calling subscriber and springs 3, 4 and 5 are restored to normal. 7 i

It will be noticed that in the connector 1) I have provided an extra relay 23 for controlling the release of the connection, whereas in the past, the springs 38 were controlled directly by thedouble wound line relay. I have provided this extra relay 23 in order to insure the release of the connection 1n case the magnet 2 at thetelephone 18 of comparatively low resistance.

For instance, when the battery has been reversed and the calling man desires to release, it will be seen that even though the line circuit is opened at the switch hook springs yet the magnet 2 and the upperwinding of relay 22 would be in series with battery and ground and relay 22 might receive enough current to hold it energized; However, relay 23 must always deenergize when the line cir-.

cuit is opened whether battery is reversed or not and will therefore always fall back and release the connection when the line circuit is opened. It will be understood that if magnet 2 is made of high enough resistance then relay 23 may be eliminated and springs 38 controlled directly by relay 22.

It is to be understood that the normal conductors 60 lead to multiple sets of contacts in the banks of the connectors, and that when the line ofstation A is called over these normal conductors, relay 9 energizes only part way due to a mechanical interlocking device controlled by the relay 8. When the line is called, therefore, relay 9 opens springs and34, separates spring 28 from its back contact, but does not close the connection to the wipers nor operate springs 18, 19, and 2O.

It will be seen therefore that I have provided a very eflicie'nt, simple and easily applieddevice "for automatically controlling a coin collector to either collect or refund a coin to a calling subscriber after conversation is completed-and in such a manner asto prevent a subscriber from interfering with the operation. i i i I wish it understood'that although I have illustrated only one embodiment of my invention, various changes in the automatic switches may be made without departing from the spirit of my invention; for instance, any number of selectors may be inserted between the line switch C and the connector switch D without interfering with the operation of the circuits and mechanism for controlling the coin collector.

Having described and pointed out the features and aspects ofmy invention, what I consider to be new and desire to have protected by Letters Patent will be pointed out in the appended claims.

\Vhat I claim as my invention is:

1. In a telephone system, a line, an automatic progressively movable trunking switch individual to said line, wipers for said switch, said line normally disconnected from said wipers, a relay for connecting said line with the wipers when energized, a coin collector for the line having means for either collecting or refunding coin, and means responsive to the deenergization of said relay for operating the coin collector to either collect or refund a coin.

2. In a telephone system, a line, a coin collecting device for the line, a magnet for controlling said device to either collect or refund a coin, an automatic trunking switch individual to said line responsive to the initiation of a call fromsaid line for selecting an idle trunk line, means for extending a connection from said. trunk line to a called line, a relay individual to said line switch responsive to a called subscriber for preparing a circuit for said magnet, and means controlled by the release of said line switch for completing the circuit to operate said magnet to collect a coin.

3. In a telephone system, a line, a bridge across said line, a coin collector for said line having a magnet for controlling the operation thereof, an automatic switch, a

, bridge cut off relay for the line energized when the line is called to disconnect said switch from the line, and energized when the line is calling to cut the line through to the wipers of the switch, and means controlled by the deenergization of said relay only when the line is calling for controlling the operation of said magnet to either collect or refund a coin for the calling subscriber.

4. In a telephone system, a line, a calling device and a coin collecting device for said line, said calling device normally inoperative until. a coin is deposited in said coin collecting device, a magnet for controlling the coin, an automatic switch individual to the line and responsive to the initial closure of the line to extend a connection therefrom, a line relay for the switch in bridge of said line, a bridge out off relay for disconnecting said. line relay from the line,

other relay, a circuit for said other relay controlled jointly by the line and cut ott relays, and means controlled by the operation of said other relay for controlling said magnet to either collect or refund a'depositedv coin, depending upon whether or not the call was successful.

5. In a telephone system, a line, a telephone, on oneend of said line and an auto- ,matic switch on the other end thereof, a battery, a magnet at the telephone connect edfr'om the line to one side of said battery,

' pair of line reliiys :tor the switch bridged across the line in series with the battery, a

releasing device in the line circuit at the telephone consisting of: means for opening the line circuit on one side of said magnet, means for reversing: the connection of the line relays to the line circuit, one oi said relays deenei'gized when the line is opened whether the connections are reversed or not,

and releasing; means for said switch Cmtrolled by said last mentioned relay.

6. In a telephone system. a line, an automatic switch, a trunkii'inswitch "for extend inn said line to said automatic switch when calling, a line relay 'lior controlling the said line relay, and means for preventing said cut-oft relay from operating said magnet when energized responsive to an incoming call.

7. In a telephone system, lines, acoin collector for each line, an automatic progressively movable switch 'lorextendiiig a talking circuit from any of said lines to another line, a conductor. separate from the talking circuit, means controlled over said conductor for controlling the release oi. said auton'iatic switch, a relay controlled over said release circuit, and means controlled bysai'd relay for controllino' the operation of said coin collector to either collector refund a coin deposited in said collector.

8. In a telephone system, a line, a coin collecting device for said line, an automatic switch for said line. another automatic switch, said first switch for extendinga connection therefrom to said other auto matic switch, a trunk release circuit con trolled from said other switch for releasing said first switch, and means controlled over said trunk release circuit for controlling the operation of said coincollect-ing device toeither collector refund a deposited coin.

9. In an automatic telephone system, a telephone station, a central exchangeoilice, a line connecting the telephone with the central ofiice, aeoin collecting box at thetele phone station, an automatic progressively movable automatic switchat the central of:-

Free tor connecting the calling line with any one of several other lines, a battery at the central oiiice, means at the telephone for sending impulses from said battery for operating said automatic switch, a magnet at the telephone for controlling the operation ct said coin collecting bog, a relay tor said an tomatic switch, means for releasing said switch controlled by saidirelay, said relay connected with one terminal of said battery,

means for connecting the other terminal of said battery with either side of said line,

and means for insuring that theother side of said relay shall always be connected to the side of the lineopposite that to which the connected.

10. In an automatic telephone system, a progressively movable automatic switch, a line terminating'in said switch, means for (mendin said switch to connect said line with any one of several other lines, release mechanism for said switch, a battery for operating'said switch, a device for connectsaid other terminal ofsaid battery has been U ingone terminal or said battery to either one of the two sides of said l1ne,a relay for said automatic switch, said relay controlling the release mechanism of said switch, one terminal of said-relay connected to the other terminaloi. said battery, means included in said device for switching the other terminal ofsaid relay to the side of the line opposite which the said first-mentioned termin al ot the said battery is connected, a coin collectingdevice associated ,wlththe end of said line opposite the end terminating in said automatic switch, and 'amagnet for controlling said coin collecting device, said magnetconnect'ed at said other end of said line between the line and the second mentioned terminalot said battery;

11. In a telephone: system, an automatic switch, a subscriber-s line connected to said switch, a pair oiireljays for said switch energized over the two sides of said line in series, release meclianis'i'n' for said switch, said mechanism controlled by one of ,said relays and said release relay connected to oneterminal of the battery, a measured service, de vice, a magnet at the telephone for controlling said measured service device','said magnet connected between the same terminal of said battery and said line, saidother relay in said switch for controlling the operation of said switch, said last mentioned relay connected to the other terminal otsa'id battery, and means at the telephone for severing the connection between the said two relays of said automatic switch.

l2. In a telephone system, an automatic switch, a subscribers line connected to said switch, a pair of relays for said switch energized over the two sides of said line in series, release mechanism for said switch, said mechanism controlled by one of said relays and said release relay connected to one. terminal of the battery, a measured service device, a magnet at the telephone for controlling said measured service device, said magnet connected between the same terminal of said battery and said line, said other relay in said switch for controlling the operation of said switch, said last mentioned relay connected to the other terminal of said battery, and means at the switchhool-z for severing the connection between the said two relays of said automatic switch.

13. In a telephone system, means for connecting two telephone subscribers in a talk ing connection, said means including a pair of progressively movable automatic switches, an assessing device in combination therewith, release means for one of said switches, said release means controlled from the other switch over a circuit excluding the talking circuit, said assessing device also under the control of said releasing circuit for assessing a charge for the connection, and means under the control of the ca ling subscriber for controlling said release circuit to cause the operation of said releasing means to release one of said switches and to cause the operation of said assessing device.

1 In a telephone system in which a connection is established between two telephones through the medium of two links, each link having an automatic progressively movable switch individual thereto, one of said switches having release means controlled by the other switch over a trunk release circuit, the combination of a coin controlled measured service device at the calling phone, and means individual to one of the links for op erating said device to collect or refund a coin, the operation of the said last means controlled over said trunk release circuit.

15. In a telephone system,a line, a coin collecting device for said line, a magnet for controlling said device to collect or refund a coin, means including a series of automatic switches controlled from said line to extend a talking circuit to another line, a trunk release circuit for controlling the release of one of said switches separate from the talking circuit, and a relay controlled over said trunk release circuit for operating said magnet to either collect or refund a coin.

16. In a telephone system, a line, a coin collecting device for the line, a magnet for controlling said device to collect or refund a coin, means including a series of auto matic switches for extending a talking circuit to a called line, a conductor separate from the talking circuit for controlling the release of the first switch of the series, and means controlled over said conductor for operating said magnet by an increased flow of current to either collect or refund coins.

17. In a telephone system, a subscribers line, a coin collecting device at the station on said line, a magnet for controlling said device to collect or refund deposited coins, means including a series of automatic switches for extending a talking circuit from said line to a called line, a conductor separate from the talking circuit for controlling the release of the first switch of the series, a. relay controlled over said conductor for operating said magnet by an increased flow of current, and a second relay controlled over a conductor of the talking circuit for determining whether any given coin will be collected or refunded by said magnet.

18. In a telephone system, a subscribers line, an automatic switch controlled over said line to extend a talking connection from said line to a called line, a grounded battery at the exchange, a double wound line relay for controlling said switch bridged across the talking circuit in series with said battery, a connection from the line to ground at the station on said line independent of the switchhook, and a relay for controlling the release of said switch connected in the line relay bridge between one talking conductor and the grounded pole of said battery, whereby the subscriber on said line can control the release of the switch by hanging up his receiver without interference from said ground connection.

Signed by me at Chicago, Cook Illinois, this 10th day of June, 1919.

WILLIAM NALTER OWEN.

County,

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