US2184842A - Intercommunication system - Google Patents

Intercommunication system Download PDF

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Publication number
US2184842A
US2184842A US199109A US19910938A US2184842A US 2184842 A US2184842 A US 2184842A US 199109 A US199109 A US 199109A US 19910938 A US19910938 A US 19910938A US 2184842 A US2184842 A US 2184842A
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United States
Prior art keywords
relay
contact
call
cam
signal
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Expired - Lifetime
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US199109A
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English (en)
Inventor
Kirch Josef
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Mix und Genest AG
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Mix und Genest AG
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Publication date
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
    • H04L15/24—Apparatus or circuits at the receiving end
    • H04L15/26—Apparatus or circuits at the receiving end operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals

Definitions

  • the invention relates to intercommunication systems, and more particularly to party-line systems for securing selective calls between the various branch stations thereof.
  • the present invention has for its object to provide a simple and reliably operating arrangement for automatic call discrimination. This is achieved according to the invention in such manner that each signal element of a Morse code transmitted over a party-line is adapted to displace in response to the alternating current periodicity a particular setting member appropriate to the ordinal number of the signal element, so as to actuate that call indicating means, the entire setting members of which have been properly set when all signal elements have been received.
  • Call discriminators or eliminators of the above mentioned type may be employed eitherin all ⁇ branch stations or in certain branch stations of the party-line, in an exchange located at the end thereof, for example; Such stations will be effectively called merely if the code combination allotted to this station has been accordingly received.
  • Fig. 1 illustrates the wiring diagram of a call discriminator in which each code element is adapted to operate a particular setting member, while Fig. 2 shows a modification over the arrangement of Fig. 1 in which all setting members are operated by a drive arrangement common thereto.
  • the dot maybe produced by one, the dash by three revolutions of 15 the magneto generator. Since one revolution generally corresponds to six cycles or impulses, six thereof are produced for a dot and eighteen for a dash.
  • a partyline L there is shown a partyline L.
  • the branch station illustrated in this gure comprises a call discriminator having an alternating current relay W and stepping mechanisms A, B, etc.
  • the relay W responses to each alternating current cycle transmitted over the party-line L and may, for instance, be an alarm ringer, the armature of which is provided with a control contact w.
  • the stepping mechanisms A, B, etc. are preferably designed as telephone relays, the armatures of which are equipped with a driving pawl adapted to engage a ratchet wheel.
  • the stepping mechanism A is adapted toI receive the iirst signal element arriving over the partyline, the second s.gnal element being adapted to influence the stepping mechanism B and so forth.
  • the party-line system employs Morse code signalcomprising three signal elements as a maximum such as etc.
  • an entire number of three stepping mechanisms is required.
  • Each stepping mechanism moves a cam discy Sa, Sb, etc.
  • the contacts Ica, Ich, etc., actuated by the cam discs are interconnected in series relation so that the call indicating relay P will be operated in that branch station only, the code combination of 45 which corresponds to the Morse code transmitted over the line.
  • This call indicating device vis a slow-to-operate relay which is allowed to attract merely in vsuch cases that the last cam disc has ben arrested Von the contact allotted thereto. 50
  • this timing ofthe relay prevents its attraction if the contact has been transiently actuated, that is to say when the cam disc is moved beyond the position' in which the contact is closed. It is thus possible by the 'provision of 55 a sumcient delay with respect to the operation of this relay to allot to the individual stations Morse signal combinations composed of a different number of signal elements. In other words, various stations may be called by three, and other stations by two individual signals, for example.
  • the relay P is not rendered effective immediately after the receipt of the code on the contrary a certain time interval elapses before the operation of this relay so as to permit the energizing circuit for the relay P of the station having the call cornbination to be duly interrupted prior to the receipt of-an eventually arriving third element which in the present case was assumed to be a dash.
  • dashes of particular lengths may be employed as call signals in addition to the normal dashes and dots. Such dashes of longer duration may, for example, be produced by ten revolutions of the magneto generator and utilized for collective or accident calls, in which case the cam discs in addition to the cam for individual calls must be provided with a second cam for the collective call, these additional cams being identically positioned in all stations.
  • the angular displacement of the stepping mechanism concerned e. g. the stepping mechanism A in the case under consideration, is thus particularly large in connection with the aforementioned type of calls.
  • the station illustrated therein may be called by a code combination, the first signal of which is a dot and the second signal of which is a dash.
  • the operation in this station is in this case as follows:
  • the calling station transmits by one single revolution of the magneto generator the rst calling signal, i. e. the dot, which comprises siX impulses whioh are received by the relay W in the station shown.
  • the contact w thus oscillates to and fro six times.
  • the :first impulse energizes the relay X over the contact sa and the resistance Wi, whereby the reverted contact :nl of the relay X transfers the received impulses to the stepping mechanism A over the contact w, the relay X and the contact .'cl.
  • the contact .r2 disconnects the relay Y from the contact of relay W.
  • the stepping mechanism A now advances its pertaining cam disc step by step.
  • a contact sa is reverted in any known manner (not shown) with the result that the original energizing circuit for the relay X is interrupted, while on the other hand battery current through the resistance Wi is preparatorily applied to the relay Y.
  • the stepping mechanism A advances its cam disc Sa by a given angle of rotation under the influence of the received current impulses and this advancement corresponds to six steps, so that the cam na at the conclusion of the train of impulses closes the contact ka. Since the relay X is a slow-to-release element, this relay remains operated during the received impulse train over its contact xl. At the end of the impulse train referred to, the relay X releases whereby its contact all is restored to normal.
  • This relay tilts its y-contacts so as to apply the stepping mechanism B under the inuence of contact w.
  • the cam disc Sb is thereby displaced by an angular rotation which corresponds to 18 steps, so that the contact kb is actuated after iinished train of impulses as will be obvious from the illustration.
  • the cam contact sb is tilted in a similar manner as heretofore described in connection with the cam contact sa, whereby a further stepping mechanism will be prepared for the reception of a third train of impulses.
  • the relay P operates after the elapse of a given period of time over the serially connected cam contacts ka, ich, etc. On attraction the relay P tilts its contact pl thus establishing a circuit for relay R which is caused to operate. The contact of this relay establishes a holding circuit for this relay, while contact r2 causes the call indicating lamp AL to be lightened.
  • the call is then answered to when the operator at this station inserts a plug (not shown) in the jack KI, whereby a conversation may be entered.
  • a plug (not shown) in the jack KI, whereby a conversation may be entered.
  • the insertion of the plug in the jack Kl interrupts the holding circuit for relay R with result that its contact T2 restores to normal whereby the call indicating lamp AL eXtinguishes.
  • thermo-relay TH is heated from that Very moment in which the stepping mechanism A was moved out from its home position.
  • the energizing circuit for this thermo-relay is traced as follows: ground, battery, resistance Wi cam contact sa, thermo-relay TH, contact mi, contact 1'3, thermo-relay contact th, ground.
  • the relay IVI is unable to attract since being short-circuited over the contacts mi r3 and th.
  • the energization of relay R causes this shortcircuit to be removed at contact r3 so that the relay M is energized whereby its Contact ml establishes a short-circuit across the relay TH and at the same time an own holding circuit.
  • the contacts m2, m3, etc. of the relay M are simultaneously closed so as to cause the stepping mechanisms A, B, etc., to be released one after another in a succession which is opposite to that of their energizations.
  • the homing circuit for the stepping mechanism B is thus traced as follows: ground, battery, stepping mechanism B, contact yi, self-interrupter contact b, contact m3, dotted connection, cam contact sb, contact mi, relay M, ground.
  • cam contact sb is restored to normal as soon as the stepping mechanism B has been horned, so that also the stepping mech-v anism A will be released over: ground, battery, stepping mechanism A, contact mi, self-interrupter contact a., contact m2, cam contact sb, contact mi, relay M, ground.
  • the cani contact sa is reverted so that the relay M becomes de-energized, whereupon all switching means of the called branch station are restored.
  • thermorelay Tl-I of these stations attracts after the elapse of a given period so as to permit the relay M to be energized by removing, at contact th, the short-circuit across this relay.
  • the stepping mechanisms of the aforementioned branch stations are then again released in the same manner as heretofore described in connection *with the actually called station.
  • a dot for instance, the relay WR responses and its contact wr causes the clutching relay A to be energized so as to engage the first cam disc Sa with the shaft of the electric drive system.
  • the cam disc Sa Under the inuence of the individual elements of the first signal transmitted, the cam disc Sa is advanced into the angular position which corresponds to the length of the alternating current transmission.
  • the contact a is thereby closed but the relay X is not energized prior to the end of the alternating train of impulses since previously short-circuited by the contact wr.
  • the relay X establishes an own holding circuit at contact :122, whereby the relay A simultaneously releases by virtue of the shortcircuit established thereacross.
  • the cam disc Sa is then disengaged from the shaft of the drive mechanism and arrested in the position thus reached.
  • the relay X preparatorily at contact connects the contact chain through to the second clutching relay B.
  • thermo-relay TH which is heated over contact x3 ⁇ immediately after the commencement of the alternating current transmission.
  • relay M is energized so as to release relay X at contact m2 and relay Y at contact m3 and to effect homing of the cam discs over a further contact (not shown). This may, for instance, be effected by the agency of a retracting spring which is relieved by the relay M.
  • the electric drive WW by a machine drive arrangement responsive to the current flowing over the line.
  • the cam discs may be replaced by contact arms or the like.
  • the release. or homing of the circuit elements thus set may be effected according to other principles than shown in the Figs. 1 and 2.
  • a particular release key may be employed, while the release of the called station may be effected by any type of switching means instead of relay R operated in response to an incoming call, such switching means being actuated on answering to the call, that is to say, when the operator inserts the plug into the answering jack, for example.
  • a party-line system having several branch stations, a party-line common thereto, and means for generating alternating current Morse'code signal consisting of a plurality of signal elements each of which being composed of any desired number of alternating current cycles, each branch station comprising means responsive to alternating current cycles, means responsive to said signal elements and controlled by said alternating current cycle responsive means, a plurality of members individually allotted to the corresponding signal element of appropriate ordinal number and adapted to be moved into any of a plurality of positions by said signal element responsive means under the influence of the number of alternating current cycles transmitted, means for successively distributing eachof said signal elements to its appertaining member, call indicating means operable in dependency on the position of said members after the receipt of all signal elements of a Morse code signal, a timing device adapted to restore all means to normal after the elapse of a given interval, and means for automatically r-eleasing the called station on answering to a call.
  • said alternating current cycle responsive means is a polarized alternating current alarm mechanism the armature of which is adapted to operate control contacts.
  • a party-line system having several branch stations, a partyeline common thereto, and means for generating alternating current Morse code signals consisting oi a plurality of signal elements each being composed of any desired number of alternating current cycles, each branch station comprising means responsive to said signal elements, an electric drive energized by alternating current cycles transmitted over said party-line, a plurality of members individually allotted to the corresponding signal element of appropriate ordinal number, clutching means responsive to said signal elements and adapted to successively clutch said members to said drive so as to move said members into any of a plurality of positions under the influence of the signal elements received, means for successively distributing the signal elements to the appertaining clutching means, call indicating means operable in dependency on the position of said members after the receipt of all signal elements or a Morse code signal, a timing device adapted to restore all means to normal after the elapse of a given interval, and means for automatically releasing the called station on answering to a call.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
  • Audible And Visible Signals (AREA)
US199109A 1937-04-03 1938-03-31 Intercommunication system Expired - Lifetime US2184842A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE203267X 1937-04-03

Publications (1)

Publication Number Publication Date
US2184842A true US2184842A (en) 1939-12-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US199109A Expired - Lifetime US2184842A (en) 1937-04-03 1938-03-31 Intercommunication system

Country Status (4)

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US (1) US2184842A (de)
CH (1) CH203267A (de)
FR (1) FR835928A (de)
GB (1) GB497193A (de)

Also Published As

Publication number Publication date
CH203267A (de) 1939-02-28
GB497193A (en) 1938-12-14
FR835928A (fr) 1939-01-05

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