USRE12560E - Telep - Google Patents

Description

REISSUBD Nav. 20,1906.

w. Mv. DAVIS. TELEPHoNB-BXSHANGE SYSTEM.

APPLICATION FILED 00T.30. 1903.

:o a part k acl y. l A battery-transmitter a,

UNITED sTATEs PATENT oEEro-E,

W ILIJIAM- M. DAVIS, OF SEATTLE, VWASItilNGrTON7 ASSIGNOR, BY MESNE ASSIGNMENTS, .TO STROM BERG-CARLSON TELEPHONE MANUFACTUR- ING COMPANY, OF ROCHESTER, NEW YORK, A lCORPORATION NEWV YORK."

TELEPHONE-EXCHANGE SYSTEM.

Specification of Ressued Letters Patent. Ressued Nov. 20, 1906.

Original Nox 679,731, dated August 6, 1901. Application for reissue led October 30, 1903. Serial No. 179.243.

5 ton, have invented a certain new and useful Improvement in Telephone-Exclian e Sys.- tems, of which the following is a fulI, clear, Iconcise, and exact description, reference being had to the accompanying drawing,` formof this specification.

My invention relates to telephone-exchange systems, and more particularly to that class of 'telephone-exchange systems Where linerelays are em loyed for controlling circuit thro-ugh line -indicat'ors; and my invention has for its object the provision of improved means for controlling the circuits through the line-relays. f

Heretofore trolled totall ductors, Whic local circuits have been conindependent 'of the line conconnecting-plugs Within the spring-jacks, `thereby causing an actuation of the relays, and thereby the exclusion of line-indicators from circuit with other telephone-lines. In racticing my invention I employ line conuctors 'for'the relay-circuits, thefplugs servto include these conductors in circuit th the line-relays upon their insertion Within spring-jacks, the same battery that is',employed for actuating the line-indicators being also preferably employed in the operation of the relays. i l

In the preferred embodiment of myv invention I provide a supplemental contact in Vconnection with each spring-jack, which vin cooperation with a plu inserted Within the spring-j ack serves to ect current from the common battery throu hthe telephone-line and throu h the line-re ay, the armature of the relay tIiereby being attracted, then serving to separate tWo contacts included serially in the line-indicator circuit.

I will ex lain my invention more particularly by re erence to the accompanying drawing, which illustrates a met allie-circuit multiple-swit 'hboard systemequipped in accordance with my invention.

The a ,paratus at the substations 10 and 90 is we lknown tothose skilled in the art.

with its coil b and subscribers stations that included the line-relays, these circuits being closed upon the insertion of the line-indicator.

receiver e, is illustrated at each of these stations, a secondary coil at each station in this particular instance being included in a local or short circuit 'With-the telephone-receiver thereat, While the primary coil in circuit With the transmitter is placed in circuit With-both limbs oi the corresponding telephone-line upon the removal of the receiver from its spring' switch-hook.L The transmitter primary Winding of the induction-coil at station -10 is thus shown in series with the telephoneline, the telephone-receiver at this station being removed from its hook. The transmittercircuit at station 90 \is open, the receiver at said station ybeing u however, Wish to be imited to the precise arrangement of the telephone aipparatus at the have shown. There is also provided at each station a call- .bell d, preferably responsive to alternating current, which 1s included in a grounde branch that Iis closed When the telephone-receiver at that station is upon its hook. The

metallic-circuit telephone-lines extend from the substations to an exchange. The limbs e and f of each metallic line extend to springjacks g and h upon sections 1 and 2 of the multiple switchboard and are also connected with an ,answering-jack i at section 2. A common battery 7c is preferably connected in bridge between, the sides of the telephonelines. y spring-lever, Z, normally resting against a contact constituting a terminal of a lin e-indicator m, the other terminal of the line-indicator being connected With one terminal of the common battery, the remaining terminal of the common battery bein, preferably permanentlyconnected With t e limb f of each line.

' A subscriber in initiating a call closes the circuit of the battery c through the line-indicator and the sprinwlever Z, normally in circuit therewith. A re ay n is associated with each One terminal of this relayT is connected With one terminal of the battery c. The remaining terminal of each relay 1s'. in this particular instance connected With the longest line-spring of each jack for the lpurose hereinafter to be set forth. i

Each nejack em loys `three contact-springs.- the. shortest eing adapted for enga the tips yof the inserted plugs, vv

ement with on its hook. I do not,

The limb e of each line terminates in al IOO l remaining 'springs are both adapted for electrical contact with vthe same sleeve. The short line-spring of each jack is connected with one side of each telephone-line, the spring ofintermediate length is connected with the other side of the telephone-line, While th longest line-springs of the jacks as- Sociated with each line are directly connected together and arenorinally disconnected from the said li'ne. A plug is thus adapted by uniting the two longer line-springs of a jack to connect one termina] of a relay 'n with one i minal of each relay is permanently connected tele phonic si de of a telephone-line, and as the other ter- With the other scriber No. 90, she inserts the connecting-plug g within the line-jack or' the called subscriber `and by means of the key p includes the generator 1 in circuit with the grounded signal- `bell d at the called-subscribers station. lI preferably include a clearing-out indicator in circuit with the battery between a side of the telephone-circuit and a'cord strand, as indi-- cated. Immediately upon the insertion of the plugs Within the jacks, as has been explained, line-relays fn are energized and the spring-levers Z, carrying armatures for these relays, are attracted toward the relays, whereby they are disconnected from normal contacts constituting terminals of the line-indicators, the indicators thus being cut out of circuit. Thus simply by the addition of an extra contact-spring in connection with each jack I Aam enabled to dispense with the special local circuit heretofore commonly employed in the control of the line-relays.

While I have herein shown and particularly described the preferred embodiment of my invention, I do not wish to be limited to the precise construction shown, as modifications may be made without departing from the spirit of my invention but,

I-Iaving thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a telephone-exchange system, the

combination with a telephone-line extending .from a substation. to an exchange, a telephone switch-hook being provided at the substation for supporting a receiver and adapted upon the removal of the receiver to connect whose other terminal p in-l the sides lof the telephone-circuit together, of a line-indicator, a common battery adapted to be included in circuit With the line-indicator upon the removal ofthe receiver at the substation from its telephoneswitch-hook, a relay controlling the circuit through the lineindicator, a line-jack for the said telephoneline having three contact-terminals, and a plug constituting a part of a line-connecting a paratus having two contact parts, one of t ie said contact parts being adapted for engagement with two o' the terminal contacts of the jack, the latter terminals of' the jack being connected respectively with one terminal ofthe rela and one side of the telephonecircuit, the ot er terminal of the relay being connected with one terminal of the battery is connected with the aforesaid side of the tele hone-line, the said plug upon its insertion t ereby being adapted to veffect the' operatori of the relay andv thereby the restoration of the yline-indicator, substantiallyas described.

2. In a telephone-exchange system, Ythe combination with a telephone-line extending d from a substation to an exchange, a telephone switch-hook being provided at the substation for supporting a receiver, and adapted upon the removal of the receiver to Vcoii` nect the sides of the telephone-circuit to gether, of a line-indicator, a common battery adapted to be Aincluded in circuit with thev line-indicator upon the removal of the receiver at the switch-hook, a relay7 controlling the circuit through the line-in icator, a jack 'connected with the telephone-line, providedwith a plusubstation from its telephone4 rality of spring-contacts, connecting apparatus employing a plug'adapted for insertion within the jack, the said plug cooperating with the said jack upon the insertion of the plug, to short-circuit two of tliesaid springcontacts, thereby to direct current from the common battery through the said relayhand a portion of the telephone-line, substantially as described.

iro

3. In a telephoneexchange system, the

combination with a telephone-line extending from a'substation to an exchange, a telephone switch-hook being provided at the substation for supporting a receiver and adapted upon the removal of' the receiver to connect the sides of the telephone-circuit together, of a line-indicator, acominon battery adapted to be included in circuit with the line-indicator upon the removal or the receiver at the substation from its telephone Switch-hook, a relay controlling the circuit through the line-indicator, a jack provided with a plurality of spring-contacts, two of said contacts being connected with the two sides of said telephoi'ieline, the remaining spring-contact being connected with one terminal of said relay, connectingapparatus 'employing a plug adapted for insertion Within the jack, the said plug and jack co eratin upon the insertion of the plug to e ectrica ly connect the said spring-contact connecte to the said relay with one of the said spring-contacts connected to one side of the telephone-line, thereby to direct current from the common battery relay, and a portion of the telephone-line, substantially as described.

4. In a tele hone-exchange system, the combination with atelephone-line extending from a substation to a central exchange, of a source of current at the exchange for sup .ly-

i one of said line-jack springs to close* cuit through said cut-off relay Whereb'y the with said jack-springs,

in0 talking and signaling current to the ine, I a ine-indicator adapted to be connected in circuitlwith the source of current,.normally controlled upon actuation of substation apparatus, spring-jacks at the central exchange having contacts connected with the linelimbs, a cord-circuit at the central exchange, a cut-0H relay at the central exchange in a localcircuit including said source of current, land an auxiliary contact-spring associated insertion of a cordcircuit plug into the spring-jack causing connection between said auxiliary contact and cir- indicating-signal is rendered inert. l

5. In a tele hone-exchange system, the combination with a telephone-line extending from a substation to a central exchange, of a source of current at the exchange for sup lying talking and signaling. current to the ine, a ine-indicator adapte circuit with said source of current normally controlled upon actuation of substation appa-.- ratus, spring-jacks at the central exchange' having contacts connected with the linelimbs, a cord-circuit at the central exchange, la cut-orf relay at the central exchange in Va local circuit including said source of current,

- and two normally disconnected spring-jack contacts, insertion of a cordcircuit pluginto the spring-jack causing short-circuiting of said local circuit-contacts to close the circuit through said cut-0E relay LWherebythe indicating-signal is-rendered inert, said local cire 1c ui'3 including a portion of the telephone lineim 6. In a telephone-exchange system, the combination with a telephone-line extending from a substation to an exchange, of source of current at the exchange, a spring-jackat the exchange having contacts connected through the said to be included in` 'my name 14th day with the line-limbs, a cord-circuit at the exchange, aline-indicator at the exchange connected with the source 'of current and with the line-limbs and controlled u on actuation of substation apparatus to display a signal, a cut-ofi relay at the central exchange, switch mechanism controlled by'the cut-oid relay, a local circuit in cludn said cut-0H relay, said source of current an a line spring-jack contact and an auxiliary contact associated With said line spring-jack contact but normally disconnected therefrom, whereby the switching mechanism of the cut-oit relay is normally inert to complete the circuit of the lineindicator upon actuation of substation apparatus, and means upon insertion of a plug of the cord-circuit in said spring-jack for causing short-circuiting of said ine spring-jack contact and said auxiliary contact whereby the cut-off relay is energized to break the line-indicator circuit.

7. In a telephone-exchange' system, the

combination with a telephone-line extending Jfrom a substation to an exchange, cfa springjack at the exchange having contacts Aconnected with the line-limbs, a common source of current at the exchange for supplying talking and signaling'currentto line, a cord-Y circuit at the exchange, a'line-indicator at the exchange adapted to be included in circuit with said source of current and with the linelimbs and controlled u on actuation of substation apparatus to display a signal, a cutoffrela at the centra exchange switch mechanism controlled by the cut-o3, relay, a

local circuit includingi said cut-off rela said source of current an nected spring-jack contacts whereby the switching mechanism of the cut-off relay is normally inert to complete the circuit of the line-indicator upon actuation of substation apparatus, and means upon insertionof a plug the cord-circuit in -said s i'ing-'ack for causing short-circuiting of sai cuit contacts whereby the cut-off relay is ener izedto break the said ocalcircuit including a' portion` of the telephone-circuit.

. Injwitnesswhereofl hereunto subscribe of October, A. D.

Y MQ'DAVIS vIVitnesses".l y V F. E.-"Riiicmni r, Y

A.;C.'Tnox.sraur.

ytwo ocal-cir lineindicator circuit,'

two normally iscon-

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