US2424423A - Contact device for calling dials - Google Patents

Contact device for calling dials Download PDF

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Publication number
US2424423A
US2424423A US535300A US53530044A US2424423A US 2424423 A US2424423 A US 2424423A US 535300 A US535300 A US 535300A US 53530044 A US53530044 A US 53530044A US 2424423 A US2424423 A US 2424423A
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US
United States
Prior art keywords
contact
disc
call
calling
during
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
Application number
US535300A
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English (en)
Inventor
Tschumi Otto
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.)
Autophon AG
Original Assignee
Autophon AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Autophon AG filed Critical Autophon AG
Application granted granted Critical
Publication of US2424423A publication Critical patent/US2424423A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/40—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable part of a cycle
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses

Definitions

  • This invention relates to contact devices for calling dials.
  • Calling dials of known construction have, besides the impulse contact, an auxiliary contact short-circuiting the speaking set.
  • This auxiliary contact on the advance movement of the call disc, was up to date closed by special means and remained sulted in the fact that after the operation of the receiver contact one had to wait for the selecting signal before the selecting operation could be commenced by advancing the call disc, because the speaking set was short-circuited by the above-mentioned auxiliary contact immediately after the beginning of the advance movement of the call disc.
  • Another disadvantage of this known arrangement resides in the fact that, during the operation of the call disc, i. e. during the shortcircuitin of the speaking set, even the busy tone could not be heard by the calling subscriber.
  • This busy tone was only audible in the short periods of rest position of the call disc, so that, on a quick selecting of the different figures, this tone was not caught by the calling person and could thus only be heard when the selection was already accomplished. This resulted in too long a seizure of the main station and in the risk of making faulty switching operations.
  • the contact device is characterised in that it comprises a contact which, on the advance movement of the call disc, short-circuits the speaking set for, at most, a short time.
  • the contact is not closed before the return movement of the call disc begins.
  • a busy tone can be heard in the rest position or during the advance movement of the call disc.
  • the subscriber can bring the call disc at once into the advanced position so that, on receiving the selecting sign, he can immediately give out the impulses by letting the call disc go, the time of seizure being thereby considerably reduced and the establishment of the connection accelerated.
  • Fig. 1 is a diagrammatic view of a first
  • Fig. 2 is similar view of a second embodiment
  • Figs. 3 and 4 show a mechanical part of a third example in different views.
  • Fig. 1 represents an application in remote-controlled devices.
  • the speaking set G is connected to the subscribers line a-b which can be shortcircuited by the R, the impulse contact 2' and the relay contact 11, bridged-over by the condenser C, are connected in series to the speaking set G.
  • Contact is is ara way that it is closed during the advance movement of the call disc for a short time. and during the whole return movement of the disc.
  • an alternating current impulse for instance, is given to the device (over the condenser C an alternating current lishment can be commenced.
  • connection is, to be established by the subscriber himself, he dials his call disc in accordcall disc for other purposes than for the subscribers self-connection only.
  • Fig. 2 shows another example of application of I the contact operation according to the invention in a remote-controlled subscribers station, in which the call disc carries out the additional operation of changing the speaking direction.
  • the subscribers amplifier and electro-acoustic transformer are connected to the terminals A while the opposite side of the repeater U leads to the transmission conductor a-b which can be short-circuited by the contact k.
  • the middle of the transmission winding lying on the side of the network is earthed over relay R, contact 11 and the impulse contact i.
  • Contact n is bridged-over, both by the condenser C and the contact 761.
  • the contact operation according to the .invention which, in this example, is characterised in that the contact is short-circuiting the line ab is not closed during the whole operation of the call disc but only during the return movement of the latter, presents the additional advantage that the time necessary for changing over the speaking direction (by a corresponding operation of the call disc) is considerably reduced.
  • Figs. 3 and 4 illustrate the mechanical part of another example in which the contact is is closed during the return movement of the call disc until the latter is at rest.
  • a contact device for calling dials of a speaking unit two springs forming a contact for shortcircuiting the speaking unit, a pin between said springs adjusted to keep said contact open, and a means for actuating the said pin to close the contact at most a short time during the advance movement and during the whole return movement of the calling dial.
  • a contact device for calling dials of a speaking unit two springs forming a contact for shortcircuiting the speaking unit, a pin between said springs adjusted to keep the said contact open, a member connected with said pin to withdraw the latter from the space between said springs, an impulse disc, a driver connected with said impulse disc and adjusted to cooperate with said member to withdraw said pin during the whole return movement of the calling dial.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
US535300A 1943-05-21 1944-05-12 Contact device for calling dials Expired - Lifetime US2424423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH599308X 1943-05-21

Publications (1)

Publication Number Publication Date
US2424423A true US2424423A (en) 1947-07-22

Family

ID=4522645

Family Applications (1)

Application Number Title Priority Date Filing Date
US535300A Expired - Lifetime US2424423A (en) 1943-05-21 1944-05-12 Contact device for calling dials

Country Status (3)

Country Link
US (1) US2424423A (de)
CH (1) CH247879A (de)
GB (1) GB599308A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848552A (en) * 1955-08-11 1958-08-19 Itt Loud-speaking station for automatic telephone systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1424368A (en) * 1921-01-21 1922-08-01 Automatic Electric Co Substation telephone circuits
US1551626A (en) * 1921-08-02 1925-09-01 Automatic Electric Co Substation telephone circuits
US1652645A (en) * 1920-12-20 1927-12-13 Kellogg Switchboard & Supply Substation circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1652645A (en) * 1920-12-20 1927-12-13 Kellogg Switchboard & Supply Substation circuit
US1424368A (en) * 1921-01-21 1922-08-01 Automatic Electric Co Substation telephone circuits
US1551626A (en) * 1921-08-02 1925-09-01 Automatic Electric Co Substation telephone circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848552A (en) * 1955-08-11 1958-08-19 Itt Loud-speaking station for automatic telephone systems

Also Published As

Publication number Publication date
GB599308A (en) 1948-03-10
CH247879A (de) 1947-03-31

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