US1789142A - Intercommunication telephone system - Google Patents

Intercommunication telephone system Download PDF

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Publication number
US1789142A
US1789142A US351017A US35101729A US1789142A US 1789142 A US1789142 A US 1789142A US 351017 A US351017 A US 351017A US 35101729 A US35101729 A US 35101729A US 1789142 A US1789142 A US 1789142A
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United States
Prior art keywords
chief
talking
loudspeaker
circuit
subordinate
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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US351017A
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English (en)
Inventor
Knos Gunnar Borje
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
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Publication of US1789142A publication Critical patent/US1789142A/en
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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
    • H04M9/001—Two-way communication systems between a limited number of parties

Definitions

  • the :present invention relates to intercom 'munication telephone systems. 1 More especially,:.it refers to such systems which are calledchief telephone systems and which in Vgeneralfare chairacterizedfby that the telephone apparatus are divided intochie'f apparatus and subordinate apparatus the former 0f 'wliich the chief apparatus are provided with loudspeakers and highly seni Sltfl'ilGplHlCl-OPhOIlGS, in order/to facilitate conversations :at a comparatively great.
  • Esa'id extension apparatus being not able to comnnu'ricate mutually among themselves.
  • the present invention is substantmlly characterized Eby that the system @GOBJFBISBS three 120 kinds. of appanatus -wh-ich mayqbe called- Tchiefapparatus,sub-chief apparatus.
  • the loud- 1 speaker and the sensitive microphone may he 40 used when talking with allthe other apparatus.
  • the loud- 1 speaker and the sensitive microphone may he 40 used when talking with allthe other apparatus.
  • niust use hand receivers because the talking currents pro prised-bythe sensitive microphones arenot sufiiciently strong toactuate a loudspeaker,
  • the subchief apparatus are provided with a special speaking; set for conversation with the chief talking line circuits with the aid of switches line's "of i'alltthe' subordinate apparatus.
  • Th ectalkiiig c-onn'ections are be shifted froin thenorinal positionshown'on ,the drawing into a signalling position by apparatus, the microphone :of said speaking set anay-heofsuch a typethat the loudspeaker v of the chief apparatus may be vactuatedby sufiiciently strong ---'c ur rents.
  • the system has 7 further the advantage that a sub-chief when 455 talkingto the chief may communicate with asubordinateapparatus withoutiiinterrupting V the communication with the"chief-apparatus V in order to :gather --ilnifonmaitions the coversa tion with the subordinateapparatus being 'then held without using the -lo udspeaker 'and the:sensitivefniicrophone;
  • the two speaking sets of the suh chief-xapparatus "are for this purpose adapted to be connected independ- :ently of each other into the' -corresponding or keys individual 1i30"tl l6f:ll n6S, the systein @heing.
  • the chief apparatus A, B, C are allprovided with a loudspeaker MT -and two semescoirnected sensitive microphones M- which ordiv narily areinounted together vwith. the switches in an apparatus loox.
  • v Said'loudspeakers and 400 ordinate to the apparatus Awhich latter is V microphones are intended to be used when sion apparatus in relation to the chief apparatalking with a subordinate apparatus which psi t(l11en using a microtelephone of ordinary
  • the chief apparatus aresubdivided into chief' and sub-chief apparatus as the apparatus Band C are subt e ea c f appar tu e app us B a C' being-then called sub-chief apparatus,
  • Thechief apparatus A' normally uses the loudspeaker but, if desired instead a telephone receiver HL may be connected into circuit.
  • the switching over is effected by means of a switch disposed in connection with the hook HO on which the tele phone receiver HL is placed in such a way 7 that the loudspeaker HT is disconnectedand the telephone receiver HL is conn'ectedinto circuit when removingthe lattenfrom the hook HO.
  • the apparatus D is'o'nly provided with a hand microtelephoneltlTi; 1
  • Each apparatus isprovided with an optic signalling device AS; B'S,.CS or- DS respectively individual to each line in-theformof.
  • an electromagnetic-ally actuated signalling shutter orthe like Furtheran acoustic signalling device RS in the form of a call bell as disposed in common to all the lines. -The I apparatus A, B and G are also provided with a buzzer signalling device SS.
  • the signalling devices RS and SS may be connected into circuit and disconnected by means of a switch S0 shi ftable into three positions. In the normal middle position-of the switch as shown (on the drawing the buzzeresignal SS is connected into circuit. By throwing the switch j down the call bell BS is instead connected into circuit.
  • Fur- .therth'e apparatus A, B, C are cachprovided V with aspecial talking batteryTB :which nor mally is disconnectedfrom the talking Zwires phones'Mand the loudspeaker HT by shiftR but at a conversation with-subordinate ap- .paratusis connected into the corresponding talking circuit together with the'microtel'eing the correspondingswitch into talking position; Forsignalling a battery SB common to all the apparatus is used.
  • the subordinate apparatus D has no special talking battery.
  • Figure 1 shows onlya subordinateapparatus D although'usually several apparatus of this kind are used. Accordingto the shown c rcuit dlagrani they are arranged asfextenanother.
  • the switch D0 In order to answer-the calls the switch D0 is shifted'to talking posit-ion theshutter magnet and the call bell being'then disconnected and the microphone 'MT instead connected int-o circuit; At thesame time, the shutter is restored to normal position by being mechanically actuated by the switch DO;;. The talking connection is'then'completed.
  • talking'circu'it is arrangedin such a manner that the loudspeaker of th'eapparatus C'and the microphone of' the apparatus D areconnected in series into the line branch c1 rcuit b vwhereas the microphones of-the apparatus G andthe telephone receiver of the apparatus D sation connected in parallel with the talking are-included in series-inf th'e line branch a.
  • the line bra-n'ches'a' and b are-during convex battery' TB the branclicbeing then used as iareturn wire.
  • a talking connect on between the 'appara-' tusD and any of the other subordinate apparatus-on account ofa' call sent from these 'l'atter is' est-ablishediin a completely analogous manner.
  • a connection-between the chief apparatus A andany of the "apparatusB or C is established in same manner as just'de-V scribedfTh'e apparatus Band C as above described amusing, however,*the microtelephones MTgfor MTg -respectively which'are connected into circuitf: over contacts-in thecorresponding' switches B0 or CO respecv tiv'ely' wh'enisaid switchl is shifted to the talking 'p'ositio'nl
  • the loudspeaker and the sensitive microphone I-IT M or' HT M are,
  • Intercommimication telephone system comprising a number of chief-telephone apparatus provided with loudspeakers and sen'-' sitive microphones, a number of sub-chief apparatus provided witha speaking set con- SlSillIlg ot a loudspeaker.
  • anumber of subordinate apparatus means to connect said sub-chiefs ordinary speaking setfinto circuit upon establishing connection with "a chief apparatus and means to connect'the loudspeaker and the sensitive microphoneinto circuit upon establishing connection with a V subordinate apparatus.
  • Intercommunication telephone system comprising anumber of chieftelephone 'apparatus provided with loudspeakers and sensitive microphones, a number of sub-chief sisting of a loudspeaker and a sensitive microphone and in addition thereto a speaking subordinate apparatus,.telephone lines interconnecting said apparatus,switches at the i sub-chief apparatus individual to the chiefapparatus lines and adapted to connect up the ordinary speakingset of the sub-chief apparatus upon establishingjconnection with a corresponding chief-apparatus and other switches at the sub-chiet apparatus indi- 'f vidual to the subordinate apparatus lines and adapted to connect up the loudspeaker A and sensitive microphone of the sub-chief apparatus upon establishing connection with a corresponding subordinate apparatus;

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)
US351017A 1928-03-31 1929-03-29 Intercommunication telephone system Expired - Lifetime US1789142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE308811X 1928-03-31

Publications (1)

Publication Number Publication Date
US1789142A true US1789142A (en) 1931-01-13

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Family Applications (1)

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US351017A Expired - Lifetime US1789142A (en) 1928-03-31 1929-03-29 Intercommunication telephone system

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US (1) US1789142A (en))
BE (1) BE359444A (en))
FR (1) FR672218A (en))
GB (1) GB308811A (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646473A (en) * 1950-04-25 1953-07-21 Talk O Products Inc Manually operated selecting and controlling switch apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646473A (en) * 1950-04-25 1953-07-21 Talk O Products Inc Manually operated selecting and controlling switch apparatus

Also Published As

Publication number Publication date
BE359444A (en))
GB308811A (en) 1930-07-28
FR672218A (fr) 1929-12-24

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