US2394275A - Device for switching-in and disconnecting signal apparatus - Google Patents

Device for switching-in and disconnecting signal apparatus Download PDF

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Publication number
US2394275A
US2394275A US535296A US53529644A US2394275A US 2394275 A US2394275 A US 2394275A US 535296 A US535296 A US 535296A US 53529644 A US53529644 A US 53529644A US 2394275 A US2394275 A US 2394275A
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Prior art keywords
contact
switching
signal apparatus
disconnecting
sparking
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Expired - Lifetime
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US535296A
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Tschumi Otto
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Autophon AG
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Autophon AG
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults

Definitions

  • This invention relates to devices for switchingin and disconnecting signal apparatus.
  • switching-in and disconnecting a signal apparatus require a short-period operation of a switch specially provided for this purpose.
  • the device according to the invention remedies this inconvenience. It is of the kind comprising a dial for calling the subscribers and is characterised in that the switching-in and disconnecting is caused by operating the dials sparking and impulse contacts necessary for calling the subscribers. Owing to this feature no additional switching elements are necessary in that both the sparking contact and the impulse contact, in spite of their additional use, are in no way prevented from fulfilling their original purpose.
  • Fig. 1 is a diagram of this example and Fig. 2 shows a callin dial with special characters.
  • the signal apparatus N shown in Fig. 1 may be an acoustic means of communication with loud-speaker and microphone, or a teletype transmitting and receiving apparatus, etc.
  • This apparatus N is connected by means of the terminals i and 2 with the installation over which the connections are to be established.
  • the calling dial NS with the impulse contact 2 and the sparking contact is switched-in.
  • the sparking contact k is in single-pole connection with the impulse contact 2.
  • this sparking contact lc bridges-over the signal apparatus N; this fact, however, is not an essential feature of the invention, for it might, with the same elTect, just as well be connected-in at the place a.
  • the relay R with the contacts 1'1 and T2, the latter. controlling the optical signal SZ.
  • Contact T1 is bridged-over by the condenser C.
  • the calling dial NS illustrated in Fig. 2 is rotated with the finger in the hole of the first figure to be dialled. Thereby, the sparking contact k is closed, whereby a current circuit is formed going from a power source connected to the terminal I over the relay R, sparking contact 7c, impulse contact 2, to the terminal 2 and from here back to the power source.
  • Relay R comes into action and closes the contacts 11 and T2 with the effect that, on the one side, a circuit apparatus N--contact r1-impulse contact 2'- terminal 2, whereby the signal apparatus Nis connected-in while, on the other side, this operating condition is indicated by a flashing-up of the optical signal SZ.
  • the calling dial can now be let go and the device remains ready for selection owing to the position of contact m.
  • an alternating current impulse reaches the relay R over the condenser C and the contact 11, thereby rendering possible the same operations as if the subscriber himself would have controlled the apparatus.
  • the arrangement according to which the switching-in of the signal apparatus is caused merely by dialling the first figure necessary for the connection desired has the very important advantage that the holding time of the station is considerably reduced in that the subscriber must first realise which figures are to be dialled before he can begin the connecting process.
  • a signal apparatus and a device for switching-in and disconnecting said signal apparatus, comprising a dial including a sparking contact and an impulse contact necessary for calling the subscribers, said signal apparatus being arranged so that its switching-in and its disconnecting is caused by operating said sparking contact and said impulse contact.
  • said signal apparatus being arranged so that its disconnecting is caused by dialling' the first figure of the subscribers number to be selected.
  • a signal apparatus a deis established over terminal l-relay Rsignal vice for switching-in and disconnecting said signal apparatus, comprising a dial including a sparking contact and an impulse contact necessary for calling the subscribers, said signal apparatus being arranged so that its switching-in and its disconnecting is caused by operating said sparking contact and said impulse contact, a direct current circuit able to establish the readi ness for selection, and means destined to indicate to the selecting subscriber the closing of said direct current circuit.
  • a signal apparatus a device for switching-in and disconnecting said signal apparatus, comprising a. dial including a sparking contact and an impulse contact necessary for calling the subscribers, said signal apparatus being arranged so that its switching-in and its disconnecting is caused by operating said sparking contact and said impulse contact, a direct current circuit able to establish the readiness for selection, and an optical signal destined

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Description

Fab 5 19%,, TscHuMa v 9 3 DEVICE FOR SWITCHING IN AND DISCONNEfiTING SIGNAL APPARATUS Filed May 12, 1944 Iizveizibr 0, T5612, mm!) Patented Feb. 5, 1946 2,394,275 onvi on 110R, swIroiniIe-In AND DIS- ooNNEoTmo SIGNAL APPARATUS Otto 'Ischumi, Soleure, Switzerland, assignor to Autophon Aktiengesellschaft, Soleure, Switzerland, a joint-stock company of Switzerland Application May 12, 1944, Serial No. 535,296 In Switzerland December 4, 1942 Claims.
This invention relates to devices for switchingin and disconnecting signal apparatus. In devices of this kind known up to date, switching-in and disconnecting a signal apparatus require a short-period operation of a switch specially provided for this purpose.
The device according to the invention remedies this inconvenience. It is of the kind comprising a dial for calling the subscribers and is characterised in that the switching-in and disconnecting is caused by operating the dials sparking and impulse contacts necessary for calling the subscribers. Owing to this feature no additional switching elements are necessary in that both the sparking contact and the impulse contact, in spite of their additional use, are in no way prevented from fulfilling their original purpose.
The accompanying drawing illustrates, by way i of example, one embodiment of the object of invention.
Fig. 1 is a diagram of this example and Fig. 2 shows a callin dial with special characters.
The signal apparatus N shown in Fig. 1 may be an acoustic means of communication with loud-speaker and microphone, or a teletype transmitting and receiving apparatus, etc. This apparatus N is connected by means of the terminals i and 2 with the installation over which the connections are to be established. Between the terminal 2 and the signal apparatus N the calling dial NS with the impulse contact 2 and the sparking contact is is switched-in. The sparking contact k is in single-pole connection with the impulse contact 2. In Fig. 1 this sparking contact lc bridges-over the signal apparatus N; this fact, however, is not an essential feature of the invention, for it might, with the same elTect, just as well be connected-in at the place a. Between the terminal I and the signal apparatus N lies the relay R with the contacts 1'1 and T2, the latter. controlling the optical signal SZ. Contact T1 is bridged-over by the condenser C.
If the apparatus is to be disconnected by the subscriber himself, the calling dial NS illustrated in Fig. 2 is rotated with the finger in the hole of the first figure to be dialled. Thereby, the sparking contact k is closed, whereby a current circuit is formed going from a power source connected to the terminal I over the relay R, sparking contact 7c, impulse contact 2, to the terminal 2 and from here back to the power source. Relay R comes into action and closes the contacts 11 and T2 with the effect that, on the one side, a circuit apparatus N--contact r1-impulse contact 2'- terminal 2, whereby the signal apparatus Nis connected-in while, on the other side, this operating condition is indicated by a flashing-up of the optical signal SZ. The calling dial can now be let go and the device remains ready for selection owing to the position of contact m.
If the apparatus is remote-controlled, an alternating current impulse reaches the relay R over the condenser C and the contact 11, thereby rendering possible the same operations as if the subscriber himself would have controlled the apparatus.
Should it be expected that between the moment of the switching-on and the selection readiness there would be an undesirably great time interval,'it is suitable to effect the switching-on by dialling the character E specially provided for this purpose, instead of dialling the first figure to be selected. By dialling the character E the sparking contact is is short-circuited, however, without impulses being given during the movement of the dial. Finally, the disconnecting process is begun by dialling the special character A. Dialling this character causes the opening of the impulse contact 2, which opening continues even during the return movement of the dial until the sparking contact is is open. Thereby the current in the relay R is interrupted, contact 71 drops back and the signal apparatus N is disconnected.
Furthermore, the arrangement according to which the switching-in of the signal apparatus is caused merely by dialling the first figure necessary for the connection desired has the very important advantage that the holding time of the station is considerably reduced in that the subscriber must first realise which figures are to be dialled before he can begin the connecting process.
What I claim is:
1. In an installation, a signal apparatus, and a device for switching-in and disconnecting said signal apparatus, comprising a dial including a sparking contact and an impulse contact necessary for calling the subscribers, said signal apparatus being arranged so that its switching-in and its disconnecting is caused by operating said sparking contact and said impulse contact.
2. In an installation according to claim 1, said signal apparatus being arranged so that its disconnecting is caused by dialling' the first figure of the subscribers number to be selected.
3. In an installation, a signal apparatus, a deis established over terminal l-relay Rsignal vice for switching-in and disconnecting said signal apparatus, comprising a dial including a sparking contact and an impulse contact necessary for calling the subscribers, said signal apparatus being arranged so that its switching-in and its disconnecting is caused by operating said sparking contact and said impulse contact, a direct current circuit able to establish the readi ness for selection, and means destined to indicate to the selecting subscriber the closing of said direct current circuit.
4. In an installation, a signal apparatus, a device for switching-in and disconnecting said signal apparatus, comprising a. dial including a sparking contact and an impulse contact necessary for calling the subscribers, said signal apparatus being arranged so that its switching-in and its disconnecting is caused by operating said sparking contact and said impulse contact, a direct current circuit able to establish the readiness for selection, and an optical signal destined
US535296A 1942-12-04 1944-05-12 Device for switching-in and disconnecting signal apparatus Expired - Lifetime US2394275A (en)

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CH2394275X 1942-12-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642501A (en) * 1950-03-24 1953-06-16 Hall Telephone lock
US2915592A (en) * 1955-02-17 1959-12-01 Ericsson Telefon Ab L M Telephone sub-station
US3126452A (en) * 1960-03-18 1964-03-24 Arrangement in telephone instruments

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642501A (en) * 1950-03-24 1953-06-16 Hall Telephone lock
US2915592A (en) * 1955-02-17 1959-12-01 Ericsson Telefon Ab L M Telephone sub-station
US3126452A (en) * 1960-03-18 1964-03-24 Arrangement in telephone instruments

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