US1248979A - Telephone-exchange system. - Google Patents

Description

F. V- YOUNG.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED FEB- IT, I917- Patented Den 4, 11917.

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EEEEEIcK v. Yoinve, or NEWARK, NEW JERSEY, ASSIGNOR rowEsrEnn ELECTRIC COMPANY, mCoEroEA'rEi), E -1\ Ew YORK,.1\T.Y., A CORPORATION on NEW YORK.

To all whom it may concern:

' Be it known that I, FREDERICK VrYoUNc,

a citizen of the United States, residing at Newark, in the county ofEsseX and State of New Jersey, have invented certain new and useiul Improvements in Telephone-EX- change Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone eX- change systems, and more particularly to such systems of the central energy type. I The object ofthis invention is theproduction of improved signaling means forsuch scribers lines A and B, terminating at a central'oiiice, and a cord circuit C'thereat for connecting thesubscribers lines. It will be understood that a plurality oflines, similar to A andB, terminate at the central office, but,for thesake of simplicity, only thetwo'lines are shown. It is'believed that the inventionl. will be fully understood from a'description of the operation of the system shown inthedrawing,

and it willbe sodescribed.

Assuming that subscriber A desires to be connected to subscriber B, A. will signal the central oflice in the usual manner, whereupon the operator Wlll' insert the answering plug of cord circuit G into the jack assooiated with line A. The normal contacts of the jack will be thereby opened, causing the release of line relay 5 to retire the line signal. The supervisory relay 6 also operates, and if the listening key 7 has not been actuated, answering supervisory lamp 8 will be intermittently operated to furnish a signal to the operator. The operating circuit for the answering supervisory lamp 8 may be traced from battery through interrupter 9, lower normal contact of relay 10, lefthand normal contact of relay 11, alternate T Specification of Letters Patent.

T 'EEHoNE- X I-IANGE SYSTEM.

rammed et. a, ie 'r.

. Application fil ed February 17, 1917. Serial No. 149,214.

contact of relay 6, lamp 8, and sleeve contacts of the answeringplug and jack to ground. Upon the operation oft-the listen ing key, the operators telephone set is connected to the tip and ring strands of the cord circuit, and relays 1-0 hnd 11 are oper ated over a circuit from battery through the right-hand winding of relay 11, lower winding of-relay 10,and contact 12 of listening key 7 to ground. The operation of these relays opens the circuit including the in terrupter 9 and lamp 8, whereupon the lamp willcease to flash. Upon the operation of relay 11, a locking circuit established therefor from battery through the left-hand winding of relay 11, left hancl alternate contact thereof, alternate contact of relay 6, lamp 8, and sleeve contacts of the answerin plug and jack to ground. The left-hand winding of relay 11 is of high resistance so that when connected in series with the lamp 8, this lamp will not receive suilicient current to permit it to lure nish a signal; 1

After conversing with the calling sub scriber' and upon being advised that suba scriber A desires to be connected with the line of subscriber B, the operator restores the listening key to normal position and inserts the calling plug of the cord circuit G into the jack of line B. Upon the restora tion of listening key 7 to normal position, relay 10 releases, and upon the insertion of the calling plug into the jack of theline B, calling supervisory lamp 19 is lighted. The operator may now signal subscriber B by actuating the usual ringing key .13. Subscriber B, in responding, causes the. operation of supervisory relay 16, whereupon the lamp 19 is extinguished The closure of the alternate contact of relay 16, upon the operation thereof, does not include the interrupter 9 in circuit with the calling supervisory lamp 19, for the reason that relay 11 is now locked up and its right-hand contact is open. The subscribers, upon finishing a conversation, restore the receivers to the switchhooks, whereupon supervisory relays 6 and 16 release. The release of relay 6 opens a locking circuit for relay 11, permitting this relay to release. The release of these two supervisory relays also completes an operating circuit for each supervisory lamp, whereupon these lamps glow to furnish disconnect signals. The operator may then Withdraw the plugs from the jacks, whereupon all apparatus returns to normal.

Suppose, however, that before the plugs were withdrawn from the jacks, subscriber A should desire to make a recall. Then the removal of the receiver from the switchhook by subscriber A causes the intermittent operation of the answering supervisory lamp phone set to the cord circuit. The actuation of the listening key causes the operation of relays 10 and 11, and a locking circuit Will thereby be completed for one or both of these relays, depending upon whether one or both supervisory relays are operated. Supervisory relay 6 controls the locking circuit of. relay 11, and supervisory relay 16 controls the locking circuit of relay 10. The upper Winding of relay 10 is of high resistance so that when connected in circuit with lamp 19, the lamp will not receive sufficient current to permit it to furnish a signal. The operator, after conversing with the subscriber who has made therecall, may remove the plug of the cord circuit connected with the other line, and complete connection with the line desired by the subscriber recalling. In this connection, it may be noted that each end of the cord circuit is similarly equipped so that either end may be employed as an answering end and either end as a calling end. i

What is claimed is: v

' 1. A telephone exchange syste m'comprise ing telephone lines, alink circuit for inter connecting the lines, a supervisory relay, a.

signaling device, a listening key, a second relay energized upon the actuation of the listening key, a locking circuit therefor including the signaling device and contacts of the supervisory relay, and interrupter mechanism brought into circuit with the signaling device by the subsequent denergization of the second relay followed by the energization of the supervisory relay.

2. A telephone exchange system comprising telephone lines, a link circuit for interconnecting the lines, a supervisory relay for each end of the link circuit, a signaling device controlled by each supervisory relay, a listening key, a second and a third relay energized by the actuation of the listening key, a locking circuit for the second relay including contacts of one supervisory relay and one signaling device, interrupter mechanism, and a circuit for the signaling device and the interrupter mechanism including contacts of one supervisory, the second and third relays completed by the subsequent deenergization of the second relay and the energization of the one supervisory relay.

, 3. A telephone exchange system comprising telephone lines, a link circuit connecting the lines, a supervisory and a cooperating local circuit relay for each end of the link circuit, a signaling device under control of each supervisory relay, a switching device for the link circuit, an operatingcircuit for the localcircuit relays established upon the actuation of the switching device, interrupter mechanism and a circuit for each signaling device and the interrupter mechanism containing contacts of both local circuit relays and its controlling supervisory relay. 1

4. A telephone exchange system comprising telephone lines, a link circuit connecting the lines, a supervisory and, a cooperating local circuit relay for each end of the link circuit, a signaling device under control of each supervisory relay, a listening key, an operating circuit for the local' circuit relays established upon the actuation of the listening key, an independent locking cir-' cuit for each local circuit rclay'controllcd by each supervisory relay, interrupter mechanism and a circuit for each signaling device and the interrupter mechanism including contacts of both local circuit relays and its controlling supervisory relay.

In witness whereof I hereunto subscribe my7name this 16th day of February, A. D. 191

FREDERICK V. YOUNG.

cepiesof' tliis patent may be obtained for five cents each, by addressing the Commissioner of Patents, I v Washington, D. G.

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