US1333758A - Telephone system - Google Patents

Description

C. W. KECKLER.

TELEPHONE SYSTEM. APPLICATION man MAY 24, 1917.

Patented Mar. 16, 1920.

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COMIfANY, rnconronarnp, ornnwpironx; Na a eon'ronn'rion on NEW YORK.

i Sneciiicati on ILiLf trSiPQtc tQ if Patent'ed Bla r .16, 1920.

Application man-a 24, 917 Serial1\To.u1'7'0,602;

Torall whom it may concern; V

V Be it known that I, OHAnLnsWrKnoKLnn,

a citizen oftlie United States, ures idi'ngat Newarlqin thecountyofEssexand Stateof New Jersey, have invented. certain new and useful Improvements in'Telephone Systems,

' of which the-following isa full, clear, concise,"- andfexact description.

- .tems in whicha plurality .o'f telephone -sta- This invention relates to telephone, systems, and more particularly to such sys- ,tions obtain servicefover a'single line cir:

I j A The objectof this invention isto enable a subscriber atone of the stations when; the receiver is removed from the s'wltchhook to obtain a clear circuit to the centraloflice which is free from :interruptiOnsfrOrfi 7 any a of the subscribers at the other in 'accessto this line.

" in accordancepwithia feature-of this in-1 station's hav- I vention, a; 5 pluralit [of stations j norinally "disconnected'ifromajl neicircult areeach provided with a relay kWllIQh, when; .ener

; hectedwith the lineicircuit. 1 I g 'fflhisinvention isiIIustratedin the cuit comprising line conductors 5 and 61ex- V linecireuit, two such stations, B and C,

thexgswitchhook while one station is con- 7 "accompanying drawing, in whlch'a line cirtends from a central ofiice A. A plurality of subscribers"'stations'have access to this being shown in-the drawing. Individual to each 'statlon 1's a'relay'7, which, when energized, 1s adapted to connect its associated station 'Withthe line circuit. -.-For purpose ,cof identification the individual relay of station B will be hereinafter referred to as "7B 1' and that for station G. as 7C. A relay 8,

common to the" line circuit, operates upon the energization of any one of the individual' relays 7 to prevent the operation of all other individual relays. A relay 9 of high resistance controlling the vibrating contact, together with a source of current,

serves asfa sourceoftone signaling current which, on account iof 1 th'e iback contact of crimes or mw mmw annsnit, nssrenoe,ro'j wnsrnnnnmcrnrc relay 8- beingnormally closed, is normally of relay v8, when energized, maintains a locking and holding circuit for any 'indi vidual. relay which may he energized.

Referring to the operation of the system I disclosed in the 'dr'awing, it will be assumed 'thatthesubscriberof station B initiates a -;call by. removing the receiver *from the switch-hook,whereupon relay, 7B "is enel gized over a circuit from battery through the normal contact of relay 8," upper wind.-

'disablecl ,fb,ut is reiidered-eifective upon the I 7 operation of relay 8 to provide a busy test. Aslow-releasing relay 10 under the control mg of -relay FB,contact ;thereof, -the switchhook contact and apparatus at station'-B, and con'tact'16 of relay 7 B to ground!- Relay '7B," in ;operating, establishes a loclr ing andhold-ingl circuit through its lower winding, whicli'may be traced from battery through;contaot il'l: of- :slow-releasing relay 10; lowe'rwvinding .of relay 17B ,"and contact 18 or relay 7 B to -'ground-.- F Upon the operration OfreIay-WB, relaySisOperated over a v a circuit ,from' battery QO-atthe central'oflice Cir A,throughthei vinding ofrelay 8,1inecond-uctor :5, contact 21- :of Y relay 7 B, switch ihook contactf andapparatus atstation B, contact'22 of relay 7B," and: line conductor 6' back to the battery f Relay-7 8, in operati11g,:opens its-normal contact, thereby disabling the 7' individual "relays ofall' other j stations which haveaccessto this line cir- 1 'cuit; This'isaccomplishedgby opening the f V original energizing circuit, which is common to all of theindividual relaysjat the nor mal contact of relay'8, and inserting inthis original energizing circuit the high resistance winding of relay 9; The resistance of the winding'of this'relay 9 is'soahigh' as to prevent the operation of'any' of theother individual relays shouldthe'receiver of the station r' tssociated' therewitlrbe removed y from its switchhook while individual relay 9 is'in the circuit, Upon the operation of relay'8,fslow-releasing relay; 10 also operates,transferring the locking and holding circuit for relay 7B from the normal contactv '17 of relay 10' to the alternate contact thereof and the alternate contact of relay 8. In operating its'normal contact, relay ,8 there'- j by removes theshort circuit from relay 9 so that should the receiver at any of the soff stations for exam ale station C be removed from its switchhook while station B is connected to theline circuit, relay 9 would be intermittently operated over a circuit from battery throughthe winding of, relay 9, the vibrating contact thereof, conductor 23, the upper windings of relay 7C, and upper normal contact. thereof, through the 'switchl'iooltcontact and primary of the in duction coil at station C and the lower normal contact of relay 7G to ground. The intermittent opening and closing of this circuit, due to-the opening'and closing of the vib'ating contactofrelay 9, causes a current to be induced to secondary winding of the ll'itlllCtlOIl coil at station C, whereupona tone 1s produced 111 the receiver at station C indicating that the line ci-rcuitis When the receiver at station E is restored to the switchhook, relay 8 releases, thereby opening a locking circuit for relay 7B.,which new releases. Upon the release of relay 8,

the slow-releasing relay 10 is also dee'nergized, whereby all apparatus is inits normal position, ready for actuation by any other station having access to this line. i hat is claimed is: r V 1. In a telephone system, line conductors,

a plurality of subscribers stationsnormally disconnected from the line "conductors, cirs cuit leads for extending the line conductors to the subscribers station, {a switch for; brldging the telephonic apparatus across the circuit leads, a relay individual toeach station servingwhen energized to complete the connection between the circuit leads and the line conductors, an energizingcircuit for the individual relay including-a portion of the circuit leads and establishedupon the actuation of the switch, alocking circuit for the individual relay completed upon the energization thereof, and a common relay controlled over the line conductors by themdiridual relay to disable the energizing cirdisable all other individual relays while the y one of said individual relays remains energiz'ed, and a normally disabled source of tone signaling current rendered effective and as sociated with all other stations upon the operationof the common relay.

', 3. A telephone exchange system, comprising line conductors, a plurality of subscribers stations normally disconnected from the line conductors, a relay individual to each station serving when energized to connect I the station to the line conductors, a second relay common to the line conductors, an ei'iergizing circuit therefor established over acircuit including the subscribers station said relay adapted when energized to disable all other individual relays while the one of said individual relays remains energized, and a normally disabled source'of tone sig naling currentrendered effective and associatedwith all other stations upon-the operation of the common relay.

l. In a telephone system, line conductors, a plurality of subscribers stationsnormally disconnected from the line conductors, a relay individual to each station serving when energized to connect the station to the line conductors, a relay common to the line conductors and operating over a circuitincluding the subscribers station upon the closure of thelline conductors thereat,and a disabling circuit rendered efi'ective upon the operation'ot said common relay to prevent the energization-ofall other individual relays while the'one or said individual relays re mains energized. r

5. In a telephone system,,line conductors,

a plurality otsubscribers stations normally disconnected from the line conductors, a

relay individual to e-ach station serving when energized to connect the station to the line conductors, a relay common to the, line con ductors and operating over a circuit includinga subscribers station upon the closure of the line conductors thereaaa disabling circuit rendered effective upon the operation of said common; relay to prevent'the energization of all other individual relays while one of said individualrelays remains energized, and a normally, disabled source of tone-signaling current rendered eilectiveand associated "with all other stations upon :the operation of the common relay;

In-witness whereof I hereunto subscribe myname this 22nd day of May, A. D. 1917.

CHARLES W. KECKLER. I

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