US2377562A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2377562A
US2377562A US545928A US54592844A US2377562A US 2377562 A US2377562 A US 2377562A US 545928 A US545928 A US 545928A US 54592844 A US54592844 A US 54592844A US 2377562 A US2377562 A US 2377562A
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United States
Prior art keywords
common
lines
relays
key
relay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US545928A
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English (en)
Inventor
Clarence E Lomax
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Automatic Electric Laboratories Inc
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Automatic Electric Laboratories Inc
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Filing date
Publication date
Priority to BE467114D priority Critical patent/BE467114A/xx
Application filed by Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Priority to US545928A priority patent/US2377562A/en
Application granted granted Critical
Publication of US2377562A publication Critical patent/US2377562A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems
    • H04M9/005—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Definitions

  • a This invention relates in general to telephone systems, but more particularly to small intercommunicating or house systems of the trunk connected type, with secret service; and the primary object of the invention lies in the provision of new and improved circuit arrangements utilizing simple standard mechanisms, which do away with the need for any mechanical locking, in- 'terlocking, or releasingof calling keys.
  • a particular feature of this invention therefore relates to the improved circuit arrangements whereby standard non-locking push keys or lever keys of a very simple type are used for establishing a call, thuseliminating the need for complicated and delicate locking or interlocking mechanisms for these keys, either with relation to one another, or with relation to the hookswitch or cradle switch of the telephone, such mechanisms being usual with most intercommunicatingsystems.
  • Another feature of the invention relates'to the circuit arrangements permitting the use of any standard telephone in lieu of some special form of instrument, as is generally required inthis type of system.
  • any standard telephone in lieu of some special form of instrument, as is generally required inthis type of system.
  • Still another feature of the invention relates to the simple manner in which all selective switching or calling keys are rendered ineffective by removing operating battery therefromwhilea call is in progress, in order to prevent cutting in on an established connection, and therebyto provide secret service.
  • Another feature is the arrangementwhereby either a calling or called partly can re-ring the j 40 other party by pressing only the ringing key, if said other party should hang up prematurely.
  • Still'another feature is that whereby a locked outstation, on attempting a call to a busy staindicate that a call is waiting.
  • a further feature is the provision ofmeans at tion. operates the signal at the wantedstationto j certain special stations permitting such aste tion to cut in on an established connection, or
  • An additional feature permits several selective calling keys to be operated momentarily to set up a conference call, whereupon a single operation of the ringing key will simultaneously ring all stations connected to the conference circuit.
  • a party toa conference'call can hang up to leave the conference, and later re-connect by merely againremoving the receiver.
  • StationsB and C are represented as being purely local or intercom municating stations, while station A shown at a the upper left, provides for access to a central exchange CX. It will" be understood of course that the number of stations possible in practice,
  • Each station is provided with a'direct current self-interrupting signal, such as 61, actuated use of a over a separate conductor.
  • This signal may be either a bell or a buzzer, although abell is the Almost any type of standard telephone may be used, sincethe prinpreferred embodiment.
  • cipal function of this telephone is to close and open the sub-- scribers line when the receiver or handset is removed or replaced.
  • a ringer is not required; but
  • Each station is also provided with an individual select key or call key S l, S2, etc., for each station inthesystem, and a single ringing or signalling key R.
  • These keys aresimple non-locking push buttons, having only two pairs of make contacts (4 springs) for the select keys, and a single pair of make contacts (2 springs) for the ringing key.
  • Station A shows additional equipment inthe form of a single locking key T which permits con meeting the telephone l5 at this station to a central oflice trunk, represented by conductors-40
  • a condenser 42' in series is also shown connected across the incoming end of this trunk, in order
  • Push keys represent merely their low to provide a signalling means for incoming calls from the central exchange CX. This is done because of the fact that the station telephone, even were it equipped with a ringer, is completely disassociated from the central office trunk when engaged on a local call.
  • Station A also shows how the home select key may be arranged'topermit a special station to breakin on an established; connection, shouldiit be desired" to do so.
  • a small group of relays is also required, including an individual switching relay SWHSWZ fetcnfon each station of the system, plus three commoners.
  • - lays comprising a battery feed relay 1, a ringing relaysflgtand a lockout1 relay:&.
  • Aicommoncsourcerofzcurrent isremployedg. with the :positivesterminalagroundedzrionbothtalka. ingcand signallingvpurposesst
  • swmswitchingerelayzc v Subscriber B rthenr operates: the: Shvselectskew momentarilwfwhereuporributhzzthes SW23 and the;
  • Subscriber B now momentarily operates the ringing key R, which causes the operation of the commom-signallingrelay 8 from positive battery SWSarelaysz conductors: 66 andwB lg andn thence throughtthezsignalsf 61-5 and: 82.
  • ml parallelitoposietiverbatterw Relay 8 a'ISO'RGIOSBSZ am obviou circuitthrough? itsimakenontacts 5.9itoithe common lockout relay-9 whiclralsooperates: 1
  • station on. anyeinteroommunicating call. ,1 i If another subscriber now attempts-totmake a.
  • Aconference may be called by any subscriber,- merely by removing the receiver in the usual way,
  • common battery feed relay I operates upon the operation of the first select key, as previously explained, and provides the usuallocking circuit for the various relays as they -operate,through its makecontacts 58. If now the ringing keyis operated by the calling subscriber, the commonringing relay 8 will operate as previously described, and will cause the signals of all ofthe wanted stations to operate simultaneously.
  • Lockout relay. 9 also operates at this time and locks up as before, inorder to exclude the othersubscribers, and insure the same degree of privacy for a conference connection as for a regular two party connection. As each station answers by removing the receiver in the usual manner, it is immediately connected. to the common talking trunk, as previously described,with relay 1 furnishing talking battery to all stations in multiple.
  • Ringing may be repeated as often as necessary, and if one of the parties should leave the conference, he can be recalledby any of theremaining parties merely by the operation of the ringing of the conference stations;
  • a subscriber at suchastation permits-a subscriber at suchastation to conneothis telephone to a trunk suchas indicated by conductors 40 and M leading to a central exchange CX.
  • This might be any regular type of common battery exchange, automatic or manual, public or private.
  • This T key being of the locking type, may be left normally switched to the central ofiice trunk or to the intercommunicating system circuit,as desired, depending on the traffic needs.
  • th T key should be operated to connect the. telephone instrument to the local circuit as represented by conductors 52 and 53, before any select key is operated. This is necessary in order to provide a circuit for batteryfeed relay 1, whose operation is required as previously explained, at the time the individual switching relays operate, in order to provide the necessary locking circuits,
  • a call to the central oflice is made by merely removing the receiver and requesting the connection desired when theoperator answers, or by dialing, if the central oflice is an automatic exchange, and if no operator is provided.
  • a telephone system a plurality of subscib- I ers lines, a talking trunk common to said lines, a group of relays, a plurality of non-locking selective switching keys'associated with each of said lines for controlling the operation of said relays,
  • subscribers lines cachincluding: awtelephone, a talking tr-unkicom-momto said lines; a group of; relays; a plurality of non-locking selective callingkeys associated with each of said-lines forcontrolling the operatlonof. said relaysemeansr controlled by the operation ofecertai-noi said-relays-for connecting.
  • bothrcal1ed andccalling; subscribers lines to the-common talking; trunk; means I for signalling the called subscribenand at thezsametime locking ouththel other subscribers: fromthecommon trunk until the; connection ⁇ is-released means whereby the-.connectionis released-by bothlsubseribers restoring -.their"receivers;iandtmeansiwhereby either subscribermay recallthe other merelyby a momentary actuation-ct the normal l signalling means, should-said other subscriber have restored his-receiver prematurely H 6.
  • Atelephone system atpluralityv of; subscribers lines, an intercommunicatingt-trunk common to saidlines, a groupoof relays, a plurality of non-locking,- selective calling, keys associatedwwith each of said lineseforr controllingthe operation ot said, relays,.means controlled by the operation of certain. oflsaidl relays for establishing; a connectionbetween both'called' and-calling, subscribers linesand said common intercom-- municating-trunk; means foreignallingthe called subscriber andtatlthe-sametime excluding other subscribersfrom the said. connectiom and means. wherebyan attempted-call from such an excluded subscriber. tov one-0f.
  • a pluan intercommunicatto said lines, a group of renon-locking selective calling ing trunk common lays, a plurality of keys for controlling the operation of said relays,
  • a signalling key associated with each of said subscribers lines means responsiveto the operation of said signalling key to signalthe called line, means whereby a called subscriber answers and is connected to the intercommunicating trunk merely by removing his receiver, and means associated with one or more of said subscribers lines for answering calls from a central exchange.
  • Atelephone system a plurality of subscribers lines and stations, a talking trunk common to said lines, a relay individual to each of said. lines, a non-locking calling key for each of said lines at each of said stations, means respone sive to the operation by a calling subscriber-of the calling key corresponding to the called subscribers line for operating the individual relays corresponding to both calling and called subscribers lines, circuits completed responsive to the operation of said relays for connecting both pleted in "response to the operation by ating the signal device at the called subscriber's station, and means responsive: to the operation of said signalling key. for preventing other subscribers from completing connection with. thecommon talking trunk w le it is engaged. 16.
  • outmelayzfor.renderingzthercommon operate conductor to: the selectiveikeysineflective .tocomplete operating circuits ito:;any :-additional- .individual relays, in :case. :anyn-additional sselecting ,@-keys .are
  • t acts ion each-"of; said 'ndividual relayscomprising signalling contactsclocking contacts, and a pair ofrline'connecting contacts terminating the :corresponding subscrihersline, a :common signalling conductor) connected to-:al1 ofisaid signalling lcontacts,' a :common locking conductor L connected .to all :of said docking pontactava r-com mon talking circuit comprising atpairiofrcommon talkingwconductorsconnected :tto ieachsaid ;pair of line connectingicontacts,latoommon; source f current, -a commonaoperate con uctor normally connected .to-asaid source; andialso:connectedltoteach oi, said selecting :keys forvpperating the;,individual,relays associated .withzbpth calling and calledlines over their individualyconductors infresponse ,to the operation :by gazcalling subscribe
  • n 19.
  • a,plurality:;.of' subscribers lines and stations, a relayindividua'l ⁇ to reach of :said lines, a select key corresponding to each of said lines at eachof:, saidgstationsvcontactsion each :of said individual relays comprising signalling contacts, ,atpair of.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
US545928A 1944-07-21 1944-07-21 Telephone system Expired - Lifetime US2377562A (en)

Priority Applications (2)

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BE467114D BE467114A (en)) 1944-07-21
US545928A US2377562A (en) 1944-07-21 1944-07-21 Telephone system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850579A (en) * 1954-05-12 1958-09-02 Bell Telephone Labor Inc Subscriber's key telephone station and signaling circuit
US2871303A (en) * 1954-04-06 1959-01-27 Riva Antonio Da Telephone intercommunication system having means for interconnecting any two stations
US2883472A (en) * 1954-08-23 1959-04-21 Gen Telephone Lab Inc Multiphone for use in telephone systems
US2897285A (en) * 1957-01-14 1959-07-28 Gen Telephone Lab Inc Intercommunicating system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871303A (en) * 1954-04-06 1959-01-27 Riva Antonio Da Telephone intercommunication system having means for interconnecting any two stations
US2850579A (en) * 1954-05-12 1958-09-02 Bell Telephone Labor Inc Subscriber's key telephone station and signaling circuit
US2883472A (en) * 1954-08-23 1959-04-21 Gen Telephone Lab Inc Multiphone for use in telephone systems
US2897285A (en) * 1957-01-14 1959-07-28 Gen Telephone Lab Inc Intercommunicating system

Also Published As

Publication number Publication date
BE467114A (en))

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