US1324749A - Telephone system. - Google Patents

Description

F. MFSLOUGH.

TELEPHONE SYSTEM. APPLICATION men luv 13. 1915.

Patented D6019, 1919.

hm 30 Q3 INVETOR.

ATE

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earns ii FRANK M. stones, or ELYRIA, OHIO, ASSIGNOR, ZBY'MESNE assisnmnnrs, 'ro S'I'BOMBERG-CARLSON TELEPHONE MFG. 00., or noonnsrnn, NEW YORK, A

CORPORATION OF NEW YOBK.

TELEPHONE SYSTEM.

Specification of Letters Iatcnt.

Patented Dec. 9, 1919.

such as will enable others skilled in the art to which it appertains to make and use the same. I 1

My invention relates to telephone systems,

and more particularly to systems in which the central station connecting circuits are automatically broken when the conversation is terminated.

One of the objects of my invention is to provide means for interrupting the central station circuit connections at both ends of said'connections and assignin the control of such means to one of the su scribers who has been" conversing.

Another object of my invention is to provide means to prevent the operation of the line lamp of the other subscriber during the time intervening between the hanging up of the receivers of the two subscribers.

Another-object of my invention is to pro vide means for maintaining the interruption of the central station circuit connections at each end thereof between the retirement of the subscribers and the retirement of the embodiment of my invention illustrated therein, at A is shown atelephone line to which a substation B is connected. At D is shown the main station provided with suitable means for connecting telephone lines together, sac-.1 as a cord circuit C. A second line is Shown at E to which are connected substations F, F F and F Either of the lines may be single or multi-party lines, and

each leads to the station D. Hereafter the line A will be spoken of as the calling line and the line E as the called line and the subscriber B as the calling subscriber and the subscriber F as the called subscriber. able switching means are provided for connecting the circuit C to the telephone lines, here shown as plugs and jacks, the line'A being provided with a jack J and the line E being provided with a jack J,. The cord circuit terminates in the plugs? and P constituting portions of said switching means. Suitable means are provided for signaling the operator "from the substations, consisting of line lamps L and L associated respectively with the calling and called line. These line lamps are controlled respectively by the relays S and S Cutoff relays S and S are also provided. The central station operator is provided with a telephone set, shown at T, which includes a receiver T and a transmitter T The connection of this set to the cord circuit is controlled by the relays R and R A test circuit is provided controlled by the'marginal relay 8,. Suitable sources of ringing current M, M M and M are employed, each adapted to supply current of a particular characteristic. Commutators N, N N and N, may be provided for breaking the ringing up into silent and active periods. Ringing keys K, K K and K associated with a master key K, are provided. A relay R, controls'the connection of the ringing current to the line E, and the relay-R is employed to control the disconnection of the same. Subscriber controlled relays are shown at R, and R The relays employed to interrupt the strands of the central station circuit connections, or where a cord cir- Suitx cuit is employed, to disconnect the plugs illustrated as a thermal arrangement, preferably made by connecting together two bars of metal having different characteristics, one

of which expands faster than the other, causing bar Y to bow downward, as shown in the drawing, with a slow movement.

'When the switching connection at G is operated, the relay R will be operated, and

50 l part of the subscriber F to institute a call,

i when the switching device H is operated,the

vIi. 5

relay R, will be operated. The relay 28,, will not be operated at this time, however, because the relay R, has completed a shunt thereof. After the called subscriber res sponds, the relay R, will be operated, completing a second shunt of the relay R In the form shown, the primary control of the disconnect relays is assigned to the calling subscriber. When the calling subscriber hangs up, the relay R, will be deenergized and the first mentioned shunt to the relay R, will be broken. Atthe same time, circuits will be completed through the relay R and through the device-X. The relay R will operate, disconnecting the plug P from the cord circuit and closing contacts in the circuit of the relay R When the circuit is completed through X it begins slowly to operate, approaching the switches 131 and 116.

After a little while, the device X will complete the circuit of the relay 3,, which will pull up its armature and complete a circuit for the relay R which, when operated, will disconnect the plug P, from the cord, com pleting the disconnection. The energization of the relay It, interrupts the circuit of the device X, so that it will be restored to normal and the system will stand ready for the Withdrawal of the plugs and both lines be released for other calls. If the relay R had failed to operate for any reason, the continued action of the device X, breaks the second shunt about the relay R which will operate over a circuit including relays R and S The relay R, will then complete a circuit for the relay R and cause the disconnection of the plug P from the cord.

It will thusbe seen that the disconnection of both ends'of the cord and the release of both lines is effected by oneof the subscribers, in the embodiment illustrated, by the calling subscriber. If, however, the disconnection at both ends was eflected instantaneously and the called subscriber did not hang up as soon as the calling subscriber, the line lamp L of the called line would come back and the operator seeing the same, would answer the call before the subscriber F retired, when there was no desire on the thus causing the operator unnecessary work, and delay the operation of the whole system. ,Howevcr, as the-device X is slow actmg, an interval of time is provided between the disconnection of the two plugs, which can be made of any suitable length and sui? 'ficient for all practical purposes to give the subscriber at? time to hang up. If, in the operation of the system, the subscriber at l hangs up first, the second shunt about the relay it, will be broken. and when the subscriber at B hangs up, the first shunt about the same will be broken, so that immediately when the subscriber B hangs up, the disconenergizingthe relay 3w talk with the subscriber F, the receiver 1 is removed from the switch-hook 2, which rises and closes a switch 2-3. A circuit'i's then completed for the relays as follows:

ground 4, battery 5S -67-8ltransmitter 93-2-1011*-12 13.- The relay S is energized, pulling up the armature 14 and closing the switch 1415, and-completing a circuit through the'line lamp L, including the battery 5 and to ground at th conductor 16., The lamp L is so positioned that its illumination will be observed by the operator at the station D, who is ap prised thereby that a'subscriber on the line A desires a connection. The operator then' iro'nnects her circuit connections with the ineA by operat :the switching device G. In the forni ls i i tl ivn, the plug P is insorted into the jack J, the contacts 21-22 and 23 of the plug P registering res ectively with the contacts 18-19 and 20 of A circuit will be completed through the/relay R, as follows: ground" 2fl-battery,25relay R,-conductor 26 1ecpi3itacts 2l-28'contacts 23 and 20re'l'ay,-.Sto ground 13, disconnects, the lampL and relay S r the line by opening the switches 6-7 and 11-12. The relay R, will be energized, closing the switches 29 and 30 and connecting the operators telephone T to the cord circuit, through the conductors 31 and 32. The relay R, will also be energized over the following circuit from battery 33conductor 34-upper winding if R,lconductor 35-conductor ide -switch 37 contact 21over the line Athrough the talking set at B-back through the contzlcts 19-22-conductor 3S) switch 40conductor 41'the other winding of the relay'R,back to the battery 33.' The rclaylt will close the switches 42 and 43-44, but opening the switch 43-45.

at 51. S, will b operated. disconnecting the lamp L, and the relay 3,, from the line E by opening the switches 52 and 53. The relay R, Wlll open a switch 54 in the circuit of i sea-pee thetcst magnet S and will close a switch The relay R, will now be actuated over thefollowing circuit: ground 56battery 57-switch 55-conductor 58conductor 59R 'to ground at 60. R, will be energized, disconnecting the set T from the cord by opening the switches 61, and 62. A circuit will also be completed when the switching device H is operated for the relayR as follows: ground at 56-57R;,63R 48i7-S,4-.6. The relay R howe' 'yer, will not be energized at this time because a shunt of the same has been completed, as follows:

generator adapted to operate the bell 66,

which we will hereassume to be the generator M. At thesaine time that the key K is operated, the master key K,- will be momentarily operated by some suitable means -associating the same, which are well known and understood, and therefore, not illustrated here. The closing of the switch K, completes a circuit for the relay R as follows: 67K,68-switch 69conduc tor 70-R,- 71-switch- 72-conductor 7 3 switch 4443eonductor 74 58-:-55-57- to ground 56. R, will be energized, closing the switches 75 and 76-47 and opening the switclu777 8, the latter in the circuit of the test relay S The closing of the switches 7 5 and 76-77 completed the ringing circuit which is as follows: ground 79-battery 80-switch- 75conductx)r 81-82 8 .-contact 85- 88-contact 8990-conductor 91-switch 92-conductor 93-switch 77--76relay 3%,, switch K .comrnutator N ringing machine Iii-rt) ground 9%. The commutator will periodically interrupt the flow of ringing current, operating the bell at intervals. The flow of current over this circuit through the bell'bridge 66 will not cause the operation of the relay R However, when the subscriber rcsp'ondsvthe re:

ceiver- 95 will be removed from the hook-' switch 96, which will close a switch9697, substitutinga circuit including the receiver and transmitter at the called station for the bell bridge, whereupon the flow of current in the ringing circuit will cause the actua- [ion of the relay R breaking the circuit of the-relay It, at the switch 69 and calls-' ing the deenergization of the relay R whereupon th ringing connections are rc-' stored to normal.

When the relay R, was energized, it also closed a switch 98, con'lpleting a locking circuit for-the said relay over the conductor 99 to ground at 100. When the called subscriber responds, the relay R, Wlll be actuated over the following. circuit :-conductor 10lupper winding R --.conductor l03-switch 104 conductor 105-sw1tch T778conductor fill-switch 92 conduc tor ill-contact 90'ovcr the line E to con tact 85switch 83c0nductor 82.conductor 110conductor 111through the lower winding of li -to battery'lll. This relay will be operated, opening the switch 72 in the circuit of the relay R, and closing switch 113, completing a second shunt about the relay R ns follows: from ground at 1l4-battery 115switch l16-conductor 117switch ll3-conductor 50. "With the apparatus in this condition the conversationtakes'place between the subscribers, At the termination of the conversation, assuming that the subscriber at B retires first, hanging up his receiver and breaking the switch 23 in the circuit of the relay R previously described, the armatures and switches controlled thereby will be restored to the condition illustrated in the drawing, breaking the first shunt about the relay R, at the switch 42 and completing a circuit for the relay R, as follows: ground.l26

relay R-conductor 121switch -43-' conductor 7i-conductor 58s wit'ch 55,- battery 57-120 ground 56. The relay B will I be energized, disconnecting the plug Efrem the strands of the cord circuit by opening the switches 37 and 40, interruptin the circuit of. the relay R, and the cut-o clay S at 27, thereby releasing the line A, which will immediately be availablet'for other calls. The relay R- Will also close a switch 28 in the circuit of the relay R which will, however still be open elsewhere. When the re-' lay 1 was denergized, a circuit was also completed through the device X, as follows: ground 100-switch 122-device X-c0n-, ductor 130-switeh 454i -conductors 74 and 58-switch -battery tiff-etc ground 56. The device X begins to operate in the manner described, and ifallowed to conglihQCOl'd, thereby enabling the device X to return to normal, and releasing. the called lme for immediate use, in the same manner tinue to do so, will first close the switch 'as described in connection with' the release of the calling line. device R failed to operate, the device X would continue, and break the switch 116 in the second shunt of the relay R which .now being unshunted, would operate over its circuit including the relays R and S which has been previously described. This relay would close a switch 150, completing a circuit through the relay R including the battery I 57 and cause the disconnection n the same manner as previously described.

- If the subscriber at F hangs up before the subscriber at B, the previously described circuit of the relay R, will be broken and the second described shunt of therelay It will be broken at the switch 113, so that when the calling subscriber hangs up and the first described shunt of this relay is broken at 42, the relay R, will be unshunted and will be operated, causing the disconnection as described, or, if during the interval of time between the beginning of the operation of the device X and the closing of the switch 131, the called subscriber hangs up, this same operation will take place. If at any time the device R fails to operate, the device R will operate as described, causing the disconnection. The disconnection having thus been made, is maintained by either or both of the relays R and R as each of the relays R and It is provided with a circuit controlled by each of the relays R and 13,. The relay R controls the relay It,-

through the switch 150 and the relay K through the switch 201. The relay R controls the relay R through the switch 140 and the relay R through the switch 200. As the relay R is controlled by the switch v sistance to which the relays R or R are wound preventsthe associated lines testing busy by the operator of any marginal test relay, as S of any testing operator. Either relay R or R will complete a circuit for the relay It, so as to maintain the same energized until the cord ,is restored to normal. These circuits will be over the conductor 58-'one of the switches 200 or 201 to battery 57, thus preventing the connection of the operators set '1 to the strands of the cord circuit after the relay R is deenergized.

It will be understood that any suitable form of. slow acting device may be used at If for any reason the X. l have illustrated a thermal device which is o erated by the heat from the coil Z, mainly ecause it is convenient to show it in the drawing, the object being to provide some means which will delay the disconneca tion of the end of the cord associated. with the called line and the release of the called line, so as to give the subscriber at F ample time to hang up. In fact, I do not. wish to be limited to the details or the embodiment 7 5 of my invention which I have illustrated for the purpose of better, describing the invention,, as it will be apparent that many departures may bemade from both the form and the details 0 this embodiment, without departing from he spirit of the invention.

I claim: 1

1. In a manual telephone system,-the combination of a main station, telephone lines leading to the main station, a substation on each line, line signal devices at the main station controlled from the substations over said telephone lines, said devices being removed from such control during the conversational period, conductors at the main station for connecting the lines together, a switch for connecting said conductors to one of said lines, a second switch for connecting said conductors tothe other of said lines, mechanism at the main station for disconnecting said conductors from one of said switches, mechanism at the main station for' disconnecting said conductors from the other of said switches, and means controlled by the switch hook of one of said subscribers for successively causing the actuating of said disconnecting mechanisms and releasing saidline signal devices.

2. In a telephone system, the combination of a main station, telephone lines leading to the main station, a substation on each line, line signal devices at the main station controlled from the substations over said telephone lines, said devices being removed from such control during the conversational period, conductors at the main station for connecting the lines together, a switch for connecting said conductors to one line, a second switch for connecting said conductors to the other line, mechanism for disconnec'ting the switches from the conductors, the line signal device of thecalling line being released when the switch thereat is disconnected, means at one of the substations controlling said disconnect mechanism and apparatus for delaying, an appreciable period of time, the disconnection of one of said switches from said conductors until after the disconnection of the other has taken place.

3. In a manual telephone system, the com- 125.

bination of a main station, telephone lines leading to the main station, a substation on eachline, line signal devices at the fi'iain Sta-' tion controlled from the substations oversaid telephbne lines said devices being re- 13() near-pee moved from such control during the convex" sational period, cord circuit conductors at the main station for connecting telephone lines together, a switch for connecting said conductors to one line, a second switch for connecting said conductors to the other line, mechanism for disconnecting the first named switch from said conductors, mechanism for disconnecting the second named switch from said conductors, means for operating said mechanisms, a device at one of said substations controlling said mechanism operating means, and apparatus at the main'station for delaying the operation of one of said mechanisms until the other is operated.

4. In a manual telephone system, the combination of a main station, telephone lines leading to the main station, a substation on- ,each line, a cord circuit at the main station for connecting the 'lines together, a switch for connecting the cord to a telephone line, line signal means at the main station associated with the calling line and controlled by the calling subscriber removed from such control when the cord is connected to the calling line, a second switch for connecting a the. cord to another telephone line, a relay for disconnecting the first switch from the cord'and releasing said line signal means, a 80 second relay for disconnectin the second switch from the cord, means or operating said relays including a source of current and circuit conductors, apparatus controlling said means including a switch-hook at one 86 of said substations and apparatus for delaying, an appreciable period of time, the op eration of one of said relays until after the other relay has operated.

5. In a telephone system, the comblnation 40 of a main station, telephone lines leading to the main station, including a calling and a called line, a substation on each line, a cord circuit at the main station for connecting the lines together, a switch including a plug and jack at each end of thecord for connecting the cord to the lines, automatic d1sconnect apparatus controlled by the'calllng subscriber for disconnecting the plugs from the cord and means to cause the actuation thereof automatically when the callingsubscriber retires, and apparatus for delaying for an appreciable predetermined period of time the disconnection of the calling plug only froni'the cord when the callin subscriber retires before the called subscri er.

6. In a manual telephone system, the combination of a main station, a. calling and a called line extending to the main station, a substation on each line, cord conductors at the main station for connecting the lines together, a switch for connecting the conductors to the calling line and a second switch 7 "For connecting the conductors to the called tine, means controlled by one of sand subs-cr ibers for automatically disconnecting the? switches from the conductors when such subscriber retires, and means for delaying the disconnection of the switch associated -with the called line from said-conductors when the calling subscriber retires before the called subscriber.

7. In a telephone system, the combination of a main station, a calling line and a called line leading to the main station, a substation on each line, a cord circuit at the main station for connecting the lines together, a plug and jack switch for connecting the cord to the calling line, a second plug and jack switch for connecting the cord to the called line, a relay for disconnecting the first named switch from the cord, a circuit for said relay including a source of current, means controlling said circuit for-causing the actuation of said relay governed'by the switch'hook at the calling substation and automatically actuated when the calling subscriber retires, a second relay controlling the connection of the second switch with the cord, means for causing the actuation of the second relay and the disconnection of the second switch from the cord governed by the switch-hook at the calling station and means for delaying the operation of said second relay when the calling subscriber retires before the called subscriber.

8. In a nianual telephone system, the 00111- Y bination of a main station, telephone lines leading to the main station, a subscriber on each line, cord conductors at the main station for connecting telephone lines together, a plug on each end of the cord, means for disconnecting the plugs from the cord conduvtors controlled from oneof said substations and a slow-acting relay for delaying the disconnection of one of said plugs until 'after the other has been disconnected.

9. In a manual telephone system, the combination of a main station, telephone lines leading to the main station, including a calling and a called line, a subscriber on each line, cord conductors at the main station, a plug on each end of said conductors, means controlled by a subscriber for disconnecting from said conductors the plug connected to such subscribers line when the'subscriber rctires, and means controlled by the same subscriber for later disconnecting the other plug from said cord conductors.

10. In a telephone system, the combination of a main station, telephone lines leading to the main station, substation devices including a circuit controller located on each telephone line and operable when the subscriber thereat retires, apparatus at the main station for connecting the lines together, ineluding circuit conductors and switches employing sleeve contacts, means for automatically interrupting said conductors when a subscriberuat one of the substations retires and electramagnetic mechanism con- I trolled through the sleevecontact of each of said switches for maintaining said disconnection until the switches are operated.

11. In a telephone system, the combinatlon of a main station, telephone lines leadlng to the main station, a cord at the main station for connecting the lines together,

a plug and jack switch for connecting the cord to one line, a'second plug and jacka relay for disconnecting the first name switch from the cord, a second relay for disconnecting the second named switch from the cord, a circuit for each of said relays, a third relay controllin each of said circuits, a circuit for said t ird rela controlled by one of said switches, a fourt relay controlling the circuits of the first and .second named relays and a circuit for said fourth relay controlled by the other of said switches.

13. In a telephone system, the combination of telephone lines, a main station, a cord circuit at the main station for connecting telephone lines together, an answering switch for connecting tbe cord to a telephone line, a calling switch for connecting the cord to another telephone line, means controlled by the calling subscriber for automatically disconnecting said switches from "said cords when the calling subscriber retires, including a device for delaying the disconnection of the answering switch from the cord while the calling subscriber is on the line and means for automatically and instantaneously disconnecting the callin switch from the cord as soon as the calle subscriber has responded independently of said delayingdevice.

14. In a telephone system, the combination of a callingline and a called line, a subscriber on each line, talking conductors for connecting said lines together, a calling switch and an answering switch for connecting said conductors to said lines, means controlled by the calling subscriber. for

' automatically and instantaneously disconnecting said conductors from said switches when the calling subscriber retires and there isno called subscriber .on the called line, a

device for delaying the disconnecti u of the canin switch from the talking conductors when the calling subscriber retires and a called subscriber is on the called line, and

connection of the calling switch from the talking conductors when the called subscrlber retires after the calling subscriber has retired and before 'the calling switch has .been disconnected from the conductors. 15. In a telephone system, the combination of calling and called telephone lines, a substation on'each line, talking conductors for connecting said lines together,- an

the talkconductors to the calling ineand a ca ling switch for connecting the calling conductors to the called line, means controlled by the calling subscriber for autoanswering switch for connectin means for instantaneously causing the dismatically disconnecting the calling switch from the talking conductors when the call ing subscriber retires instantaneously when there is no called subscriber on the called line, and means for delaying such disconnection when there is a called subscriber on the called line.

16. In a. telephone system, the combination of calling and'called telephone lines, talking conductors for connecting said lines together, switchesfor connecting the talking conductors to the telephone lines, means for automatically disconnecting said switches from said talking conductors when one of said subscribers retires and thermalmeans for delaying the disconnection of'one ofsaid switches from said talking conductors.

17. In a telephone system, the combinef tion of telephone lines, link conductors including talking strands for connecti said lines together,.a switch to connect sai link conductors to a telephone line, mechanism for disconnecting said switch from the t'a'k' ing strands and for'interrupting said talk-- ing strands automatically operated when .a subscriber retires his talking set and ap paratus for delayin the automatic operation of said mec anism for a predetermined and appreciable period oftimes 18. In a telephonelsystem, the combination of telephone lines, link conductors ineluding talking strands for connectin said lines together, a switch to connect sai link conductors to a telephone line, mechanism for disconnecting said switch i'rom the talking strands and for interrupting said talkin strands automaticall operatedwhen a su scriber retires his tal ing'set and apparatus inde endent of said mechanism '-:for

mechanism for a predetermined and appreciable period of time. I havesigned my'name day of-May, 19 15. I

FRANK SLOUGH.

delaying t e automatic, operation of said hereto this 10th

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