US1061515A - Telephony. - Google Patents

Description

G. A. BALS.

TELEPHONY.

APPLICATION FILED APR. 24, 1911.

Patented May 13, 1913.

2 sums-sum 1.

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wn/easeex h UNITED STATES PATENT OFFICE,

CHARLES A. BALS, OF CHICAGO, ILLINOIS, AS SIGNOR T0 GORWIN TELEPHONE MANUFACTURING COMPANY, A. CORPORATION OF ILLINOIS.

TELEPHONY.

Specification of Letters Patent.

Patented May 13,1913.

Application filed April 24, 1911. Serial No. 623,043.

T 0 all whom it may concern:

Be it known that I, CHARLES A. Bans, citizen of the United States, residing at Chicage, in the county of Cook andState of and said telephone lines; apparatus at said telephone station for setting said selecting mechanism into operation and for holding the same when-a telephone line has had an extension selectively connected therewith at the exchange; and switching mechanism whereby said apparatus may be interchangeably associated with said telephone lines and whereby the selecting mechanism may be maintained in that condition in which a tclcphone line and an extension are connected together through the agency of said selecting mechanism when said apparatus is trans ferred fromassociation with this latter telephone line to another telephone line.

My invention in another of its aspects may be described as a telephone system including telephone lines extending to different exchanges; a battery at each exchange common to equipment there located; a trunk line extending from one exchange to the other; link connecting mechanism at the latter exchange for connecting the trurk line with telephone lines extending to the latter exchange; circuit connections whereby the common battery at one exchange may be brought into operative association with equipment at the other exchange; and means at the latter exchange for disassociating the common battery thereat from the circuit established between lines byway of both exchanges and trunk line.

My invention in another of its aspects may be described as a tele hone exchange system including telephone lines extending to one exchange; link connecting mechanism at this exchange for uniting lines extending to this exchange; telephone lines extending to a second exchange; a trunk line intervening between the exchanges whereby connection may be established between telephone lines extending to both exchanges; an operators telephone outfit; and switching mechanism whereby said operators telephone outfit may be connected with the trunk line independent-1y of the link connecting mechanism and may be connected with the link connecting mechanism independently of the trunk line.

My invention in another of its aspects may he described as a telephone system including telephone lines exteniling to two exchanges; a trunk line extending between the exchanges whereby lines extending to both exchanges may be connected for conversation; an o 'ierators telephone outfit at the 'ex change to which the trunk line extends; mechanism for associating said operators telephone outfit telephonically with the trunk line; mechanism for preventing the association ofsaid operators telephone outfit with the trunk line when connection has been established between lines extending to said exchange by way of said trunk line and means for placing said mechanism beyond opcrators control upon the establishment of connection between telephone lines extending to the exchanges.

I will explain my invention more fully by reference to the accompanying drawings showing the preferred embodiment thereof and in which-- l igure 1 illustrates a manual switch board system provided with link connecting mechanism adapted to unite lines extending to the manual exchaiwe, the jack end ofa trunk line being shown m Fig. 1, the balance of this trunk line being shown in Fig. 2 where it extends to an automatic exchange that is diagrammatically indicated in this latter figure.

The manual exchange indicated in Fig. 1 may, for example, be considered a private branch exchange. But one telephone line 3-3 is shown though it is to be understood that many other telephone lines are mnbodied in the exchange illustrated by Fig. 1. The telephone line 3 extends from a substation A that may be of any Well known or suitable type and which terminates at a springja'ck 4: at the exchange, two talking jack springs constituting the terminals of the'lines 3 which engage with suitable back contacts for loopingin a line signal 5 in serial relation with the line and for permitting the exclusion of this line signal from circuit with the line when the jack springs are separated from their back contactsupon the insertion of a plug of a link circuit, it being understood that'the line signal 5 is included in circuit with a common battery 6 when the telephone receiver at station A is removed from its switch-hook, Link circuits are desirably vate branch exchange,

employed at the private branch exchange that have each a manually controlled plug 7 at the answering end, and the manually controlled plug 8 at the connecting end whereby lines extending from substations directly to the private branch exchange may be directly connected by means of lin'kcircuits thus provided with answering andconnectingplugs 7 and 8. The cord circuit .mechanism that is shown between the answering and connect ng plugs 7 and 8 and which is illustrated between the strands 9 and 10 of the 'cord circuit is well underlay mechanism is to remain inert, in accordance with the preferred embodiment of my invention, when the link circuit is used in cooperation with the trunk line 17 in connecting telephone lines that extend to the exchanges shown in both views, for reasons which will appear and to which end a circuit opening key 18 may be employed for breaking the conductor that extends from the common battery 6 to the link circuit. It is to be understood that I do not limit myself to'the type of link circuits shown. The relay 15 has three armature switches, theouter two armature switches serving when attracted to bridge the operators telephone outfit 16 between the talking strands of the link circuit, when the apparatus is in such working condition as to permit of this association I of said telephone outfit. Another relay 19 is employed to out the operators telephone out of circuit, the operators telephone being cutin circuit when a calling subscriber is to be answered and 'being cut out of circuit when the connecting end of the cord circuit that is in circuit with the calling subscribers line ismanipulated to tomatic exchange connect the calling subscribers line with a called line that extends to the private branch exchange.

If the operator at the branch exchange should for any reason desire telephonic connection with the exchange illustrated in Fig. 2, such operator will depress the button 20 to cause it to occupyits alternate position thereby to energize the relay 19 and transfer the connection of the uppermost contactof the key 20 and next to the lowermost contact of said key whereby these terminals are connected with-the sides of the trunk line 17 owing to the depression of the key 20, these trunk line sides being connected with the contacts that are engaged with the aforesaid contacts of the key 20 when said key is thus depressed. The circuit that is established through the relay 19 as a result of the manipulation of the connecting end 8 of the link circuit need not be described as such is now well known to those skilled in the art. The circuit which is established through said relay as a consequence of the depression of the key 2-0 may be traced from the grounded terminal of the relay 19, through the winding of said relay, the two middle contacts of the key 20, the inert armature switch of the relay 2l'and its contact, to the upper terminal of the battery 6. When the operator at the private branch exchange is through with her use of thetrunk line 17 she will operate therestoring key 22to rclease the key 20 and allow it to assume the normal position illustrated whereby the cir cuit for the relay 19 willbe opened and the operators outfit 16 has its; circuit association with the link circuit at the private branch exchange restored.

If the party whose line extends to the austood that I do not limit myself to automatic exchanges) should desire telephonic connection with a party whose line extends to the private branch exchange a 'circuit will automatically be established through the signal 23 that is located at the private. branch exchange in response to which signal the (though it is to be under-.

operator at the private branch exchange will manipulate her key 20 to bring her telephone outfit into circuit association with the trunk line 17 in the manner which has been described. After having ascertained the wants of the calling automatic subscriber the operator at the private branch exchange will disconnect her telephone out,- fit from the telephone line by pressing the releasing button 22, will insert the answer ing plug 7 in the trunk line jack 24;- and ing tau-rent as, for example, a battery 26 tl'irougli said signal. receiver 25, the switch hook at. the wanted pri "ate branch statlon, the sleeve spring of the pick at belonging to the line of said wanted private branch sta' the right hand winding of the supervisory relay 1.4-, the ringing circuit interrupter switch spring 25) and the lower contact intermittently engaged therewith to battery 20. The rest of the operations that are to ensue when the wanted private branch part-y responds and when conversation has been concluded need not be described, such being clear to those skilled in the art.

It the party at a private branch exchange station should desire connection with the party at. an automatic substation, such calling party will signal the private branch operator in the usual way and such operator will ascertain the wants ot the calling party in the usual. way and, in accordance with preferred practice, the calling party will temporarily restore his receiver upon his switch hook to await the signalv conveyed by his receiver 25 which will indicate to him that the private branch exchange operator has secured the wanted line. T he operator, in order to secure the wanted line, selects a trunk line 17 and operates a master switch key 30 individual to the selected trunk line for bringing the circuit interrupting or dial mechanism 31 into operi'i'tive association with the selected trunk line in order that the wanted automatic station may automatically be selected and while I have illustrated a 40 well. known dial mechanism for operating the selecting: mechanism at the automatic exchange, I do not wish to be limited to such dial mechanism nor to the en'iployn'ient of selecting mechanism that will automatically connect the wanted line with the trunk line,

as I consider certainfeatures of my irivciition to be broadly new in connection with means whereby the extension is automatically provided for the trunk line whether or not such extension extends clear through to the calling station. As the invention is exhibited the dial mechanism 31 in its normal position serves to establish a direct connection between the sides oi the trunk line for the purpose of holding the selecting mechanism in that position which it has been caused toassume in order to establish the desired extension for the trunk line and if the operator at the private branch exchange had no furco thcr use tor thcdial mechanism she would allow it to remain in association with the selected trunk line tor the purpose of maintaininn the connection between the sides of the trunk line for the purpose just stated.

55 It, however, the private branch operator should need the dial' mechanism 3.1. for the purpose oi selecting}; another automatic subscriber she will operate another key 32 indi vidual to a sceoml selected trunk line, said key being so mechanically inter-related with the first key 30 as to cause said key 30 to assume its normal position in which a connect ion is established across the sides of the trunk line 17 in substitution for the connection that was previously established between the sides (it said trunk line by way of the contacts Ill that are closed when the dial mechanism is in normal position. The switch 3t that causes impulses to be trans mitted over the trunk line 1.? is included in a circuit connection that. may be traced from the lower side ot the trunk line 17, the right hand contact spring of the depressed key individual to the trunk line, the contact engraced by this spring when the key 3:2 is depressed, the left. hand switch 9st of the dial 3t when this dial is oil" normal position, the contacts of the switch 3-1, the let't hand contact spring of the de n'essed key 32, the contact engaging the same, to the upper side of the trunk line 17. in this way but one dial mechanism may be employed for a group of trunks without disturbing the connections that have been automatically established between the trunks and thcextensions therct'rt'nn.

It the operator should desire to hold a trunk independently of the dial mechanism 31 and with the key mechanism 30, 32 in normal condition she will depress the holding button 3.3 to establish a connection between the sides of the trunk line. It is understood that the keys 30, 32 are individual to different trunk lines and that the dial mechanism is made common to the trunk lines by way of the keys 3t), 32. The holding circuit connection established for holding a trunk line is traceable from the lower side of the trunk line 17, the lower contact .of the key 3:"), the upper contact of this key, the fourth and third contacts from the left of the key 32 individual to the trunk line when this key is normal, to the upper side of trunk line. It is not necessary to describe the operations which occur when the dial mechanism is actuated as such are well known to those skilled in the art of automatic and semi-automatic telephony.

After the wanted automatic subscrih r whose line has become connected with the trunk line 17 has been signaled in the usual way the operator at the private branch exchange will insert the answering plug: T into the trunk jack Z-l and will insert the connectingz, plug 8 in the jack of the private branch exchange {arty originating the call whereupon a circuit will be established through the signal receiver 25 at the call (ruminating station. which circuit hashithcrtobccn traced. When a connection has thus been established through both exchanges the cord circuit at the private branch exchange should be relieved of its association with its relay equipment in order that the extension of the trunk 'line established at the private branch exchange by means-of the cord-circuit connected withi'the trunk line ma be a mere metallic continuation of the tal 'ng sides ofthe trunk line and in order thatthis condition may arise the key 18is operated to disconnect the battery 6 from the cord circuit whereby the armature switches 27, 36 at the calling end of the cord circuit-may remain normal,the armature switches 37 at the answering end of the cord circuit being then normally independent of the battery 6.

The operator will manipulate the key 18gtodisconnect the battery 6 when the super- 'v-isory lamp 12-ceases to glow. By thus 20 cuit a supervisory or disconnect. lamp 38v stripping the battery 6 from the cord cirmay be associated with the trunk line .so.

as to be under the control of the private branch exchange party connected with the trunk line, circuit through this supervisory lamp 38 being closed when the private tually become branch exchange party, Who has now viran automatic exchange party by the removal of the battery 6, restores his receiver upon its switch hook, the armature of the relay 21 that is thereupon deenergized completing the supervisory lamp circuit, such ci'rcuitbeing traceable from the grounded battery 6 through the released armature switch of the relay 21 to the grounded terminal of the lamp 38. The

relay 21is not included in circuit with the battery 6 but is included in circuit with the common battery at'the automatic exchange. The grounded terminal of the lamp 38 is disconnected from the lamp when the plug is withdrawn from theiack 24 so as to exv tinguish the light at 38. In addition to the equality in the advantages which have been cited as a" re sult of the circuit opening operation of the key 18 I also prevent the battery at either exchange from discharging into the battery of the other exchange in the event of involtages of these batteries.

JWhere the private branch exchange party is a called party and an automatic subscriber is a calling party I provide novel means'for governing the call signal device battery 6 and ground by 23 at the private branch operators position which includes electromagnetic mechanism 39 having one coil inbridge of the trunk --line and in series with a condenser 40 in "the nected in bridge of the trunk line as a con- I plugged into switch will engage its contact and hold a circuit through the coil 11 thereby to. maintain circuit through the signal lamp 23 that may be traced from the grounded battery 6 through said left hand armature switch and its contact to the grounded terminal-of the lamp '23. The ringing current through the coil 39 is cut ofii' when the operatorresponds, 1n a manner well known, whereupon circuit through the relay &1 is alone.

sequence ofwhich the left hand armature I relied upon to hold the left hand armature switch attracted, this circuit being broken when the operator plugs' in to the jack 24 thereby to open the circuit through the signal device 23-.

In night time, or any other time when it is desired to dispense with the services of an operator at the private' branch exchange for the purpose of connecting automatic and private branch exchange ,parties, cord circuits at the private branch exchange may be allowed to remain in connection with private branch lines and automatic trunk lines. As a result the signal devices 23 are excluded from circuit and the signal receivers 25 at the private branch exchange stations are'subjectto the control of the right hand armature switch associated with theelement' 39, this right hand armature switch engaging its contact to close circuit through the signal rece1vers 25 when the coils 39 are energized. The circuit thus established through a signal receiver 25 may be traced from the battery 26 through said right hand armature switch and its contact, a portion ofthe sleeve side of the associated trunk 17, the sleeve spring of'the jack 24, the sleeve of the plug inserted within said jack, the armature switches 27, 37 and their normal contacts, the sleeve of the other plug, the sleeve spring of the jack receiving said other plug, the switch hook at the substation having said signal receiver '25, the lower contact of said switch hook, said signal re ceiver 25 back to the battery 26. It is understood'that thekey 18 is operated to disconnect the battery 6 from any cord circuit that is thus allowed to remain in connection with the jacks of a trunk line and a private branch exchange line.- hen cord circuits are allowed normally to connect trunk lines and private-branch lines, a private branch party may be able to select an automatic subscribers station by means of adial'in the well knownw'ay. Each private branch exchange party who is to have facility for automatically calling an automatic exchange party, in the absence of the operator at the private branch exchange, has a cord circuit his line and the key 18 individual to such cord circuit is depressed so as to remove the battery 6 from such cord circuit.

The automatic exchange equipment shown illustrated upon page 530.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise equipment, circuit arrangement, and telephone exchange systems shown as changes may readily be made without departing from the spirit of my invention, but

llaving thus described my invention, I claim asnew and desireto secure by Letters Patent the follmving:

1. A. telephone exchange system including a plurality of telephone lines extending between an exchange and a telephone stat-ion; extensions for said telephone lines having terminals at the exchange; electromagnetic selecting mechanism for effecting'connection between said extensions and said telephone lines; circuit breaking mechanism at said telephone station for setting said selecting mechanism into operation and serving when at rest to establish connection between the. sides of the telephone line with which it is associated to hold the selecting mechanism in that position in which a telephone line is connected through the agency of said selecting mechanism with a telephone line extension; and switching mechanism whereby said circuit breaking mechanism may be interchangeably associated with said telephone lines and whereby a connection is established between the sides of the telephone line from which the circuit breaking mechanism is transferred in order to prevent that operation of the selecting mechanism associated with the line from which the circuit breaking mechanism s transferred that would cause the separation between the telephone line and extension previously connected by the selecting mechanism.

2. A telephone system including telephone lines extending to different exchanges; a battery at each exchange common to equipment there located; a trunk line extending from one exchange-to the other; link connecting mechanism at the exchange to which the trunk line extends for connecting the trunk line with telephone lines extending to this exchange; circuit connections whereby the common battery at one exchange may be brought into direct operative association with clearing out or supervisory equipment at the other exchange; and means at the exchange having the equipment with which the common battery is brought into operative association for disassociating the common battery thereat from the circuit established between lines by way of both exchanges and trunk line.

3. A telephone system including telephone lines extending to ditl'erent exchanges; a battery at each exchange common to equipment there located; a trunk line extending from one exchange to the other; link connecting mechanism at the exchange to which the trunk line extends for connecting the trunk line with telephone lines extending to this exchange; circuit connections whereby the common battery at one exchange may be buiught into direct operative association with clearing out or supervisory equipment at the other exchange; and means for disassociating the battery at one of the exchanges from the circuit established between lines by way of both exchanges and trunk line.

4-. A telephone system including telephone lines extending to different exchanges; a battery at each exchange common to equipment there located; a trunk line extending from one exchange to the other; mechanism at the exchange to which the trunk line extends for connecting the trunk line with tele phone lines extending to this exchange; circuit connections whereby the common battery at one exchange may be brought into direct operativeassociation with clearing out or supervisory equipment at the other exchange; and means at the exchange having the equipment with which the common battery is brought into operative association for disassociating the common battery thereat from the circuit established between lines by way of both exchanges and trunk line.

5. A telephone system including telephone lines extending to different exchanges; a battery at each exchange common to equipment there located; a trunk line exte ling from one exchange to the other; mechanism at the exchange to which the trunk line extends for connecting the trunk line with telephone lines extending to this exchange; circuit connections "whereby the common battery at one exchange inay be brought into direct operative association with clearing out or supervisory equipment at the other exchange; and means for disassociating the battery at one of the ex- 1 changes from the circuit established between in to both exchan es an o erators tele phone outfit; switching mechanism whereby said operators telephone outfit may be connected with the trunk line independently of the link connecting mechanism and may be connected with the link connecting mechanism independently of the trunk line; and a relay governed by the switching mechanism employed to connect the operators telephone with the trunk line and serving to shift the operators telephone terminals from the link connecting mechanism to the trunk line.

7. A telephone exchange system including telephone lines extending to one exchange; link connecting mechanism at this exchange vconnected with the link connecting mechanism independently of the trunk line; and

relay mechanism adapted to be governed bythe link connecting mechanism for control ling the association of' the operators tele phone outfit with the link connecting mechanism and adapted also to be governed by the aforesaid switching mechanism for con trolling the association of said operators telephone outfit with the trunk line.

8. A telephone system including telephone lines extending to two exchanges; a trunk line extending between the exchanges whereby lines extending to both exchanges may be connected for conversation; link connectors at one of the exchanges for unit ing lines extending thereto in telephonic connection; an operators telephone outfit at this exchange adapted for telephonic association with said link connectors; mechanism whereby said operators telephone outfit may be telephonically associated with the trunk line; mechanism for excluding the operators telephone outfit fromtelephonic association with the trunk line; and means for placing said lattermechanism beyond the operators control upon the establishment of connection between telephone lines extending to said exchanges/by way of said trunk line and a link-connector.

9. A telephone system including telephone lines extending to two exchanges; a trunk line extending from one exchange to the other whereby lines extending to both exchanges may be connected for conversation; an' operators telephone outfit at the exchange to which the trunk line extends;

Copies of this patent, may be obtained for five cents each; by addressing the Conlmissionerof Patents,

Washington. D. C,

mechanism for associatingsaid operators been established between lines extending to i said exchanges by way of said trunk line; and meansfor placing said latter mechanism beyond the operators control upon the es tablishment of connection between telephone lines extendin 'tothe exchanges.

10-. A phone lines extending'to two exchanges; a trunk line extending between said exchanges; a source of signaling current at one of said exchanges; electro-magnetic mechanism at said exchange for including said source of current in a signaling circuit, said electro-magnetic mechanism having a winding included in circuit relation. with the trunkiline; and means at the other exchange for energizing said winding whereby signaling current at said other exchange need not directly be included in the signaling circuit at the first exchange.

11. A telephone system including teletelep one system including telephone lines extending to two difli'erent exchanges, a trunk line extendingbetween said exchanges; a cord circuit at one of the exchanges adapted to connect telephone lines with the trunk line, said cord circuit having electro-magnetically controlled cord circuit apparatus in association therewith; and means for disassociating said electro magnetically controlled cord circuit apparatus from the cord circuit when such cord circuit is to be used in connection withthe trunk line for establishing connection between lines extending to the exchanges.

12. A telephone system including telephone lines extending to different ex-- changes; a trunk line extending from one exchange to the other; link connecting mechanism at the exchange to which the trunk line extends for connecting the trunk line with telephone lines extending to this exchange and also for connecting telephone lines extending to this exchange; a battery;

and switching mechanism for bringing the battery into direct association with the clearing out or supervisory signaling apparatus related to an established connection at .both exchanges.

In witness whereof, I hereunto subscribe my name this eighth day of April A. D.,

, onantns A. Bails,

Witnesses:

G. L. GRAGG, ETTA L. WHITE.

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