US1868378A - Switching arrangement for telephone plants - Google Patents

Switching arrangement for telephone plants Download PDF

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Publication number
US1868378A
US1868378A US522462A US52246231A US1868378A US 1868378 A US1868378 A US 1868378A US 522462 A US522462 A US 522462A US 52246231 A US52246231 A US 52246231A US 1868378 A US1868378 A US 1868378A
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US
United States
Prior art keywords
relay
contact
pay station
exchange
station
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
US522462A
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English (en)
Inventor
Blomberg Knut Hugo
Vigren Sten Daniel
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
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US1868378A publication Critical patent/US1868378A/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
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • H04M17/023—Circuit arrangements

Definitions

  • the present invention relates to switching arrangements in telephone plants to which paystations or coin collector telephone stations are connected. It relates more particu- 5 larly to pay stations of the kind in which the payment or debiting operation for the call is made by the Calling person Without the control of any operator.
  • Such apparatus are commonly so disposed that after the pay station has been connected to the wanted subscriber the calling person is able to hear the reply of the called party but cannot make his own speech audible to the called subscriber before he has actuated the paying or debiting device of the pay station, for example by means of a push button, the previously inserted coins being then dropped into a coin box or a callmeter being moved forward or any other charging or debiting operation being performed.
  • the blocking of speech from'the pay station has generally been brought about by rendering the microphone of the pay station currentless by a short circuit or in another manner.
  • FIG. 1 designates the pay station which includes a paying or debiting device D in addition to the parts appertaining to an ordinary telephone apparatus.
  • Said paying device is adapted to be actuated by the calling person by means of for example a push button.
  • the paying device Upon actuating the paying device, the previously inserted coin is dropped down into the coin box or a call meter is brought forward or some other similar operation performed.
  • the pay station is connected to the exchange over the line L.
  • the exchange equipment appertaining to said line is enclosed within a rectangle C in dash and dot 'lines on the drawings.
  • Figure l shows the switching diagram for an embodiment of the invention applied to the manual system of L. M. Ericsson.
  • relay BB is attracted and opens a contact 10, the lamp AL being then putoff, and closes the contact 11 whereby therelay receives holding current over the contact 9.
  • the callingperson may now ask the operator for thewanted number.
  • the operator then establishes the talking connectionexholding circuit is closed.
  • the relay SVR Upon attract-ing its armature, the relay SVR opens the contacts 1 and l closes the contacts and 8 whereby the current direction throughthe apparatus. is reversed A blocking device for outgoing speech from the nearly zero or any other' device for the same purpose.
  • Figure 2 shows a switching diagram for a similar embodiment of the invention.
  • the microphone in the pay station is in this case rendered currentless by disconnecting the central battery from the pay station.
  • the switching operation will be as Figure 1 the contact 1 is opened and the contact 7 closed.
  • the relay TB is connected to the line branch at the same time as the microphone of the pay station becomes currentless. Then the calling person can not speak with the called subscriber when the latter replies unless he actuates' the paying device D the paystation. VVhen'this is done the following current path'is closed; Earth, acontact 9 in theplaying device, the
  • Figuref3 shows the switching diagram'for another" embodiment of the invention.
  • the switching operation will be the following. WVhen thecalled subscriber B lifts his microtelepho'ne"tofreply to the call the following current path is formed.
  • TheHrelayBS R is energized the following current. path being then formed
  • the plus.pole, the contact l, the relay SVR, the contact 2, and the minus pole. relay SVR then islenergized the contacts '5, 6
  • the minus pole, the lower winding of the relay SR, and the minus pole When the armature of the relay SR is attracted a current path is formed over the contact 1, the line branch (L, the induction coil 1, the telephone receiver H, the contact 13 in the paying device D, the line branch I), the contact 2, the upper winding of the relay SR,
  • the contacts 3 and 4 are interrupted and the contacts 5 and 6 closed so that-the complete talking connection is interruptedand the speech blocking device E connected into circuit. VVh'en the called subscriber replies the calling person can hear'but 'not speak with the called subscriber unless he actuates this paying device D. Then the line-circuit is'interrupted for a moment, the relay SR deenergized, the contacts 5 and 6 opened, the contacts 3 and'el closed, and a complete talking connection established.
  • a telephone system comprising a pay station, a wanted subscribers station, an exchange, means for establishing a connection from the pay station to the wanted subscribers station, means disposed in the exchange and associated with the connection for the unidirectional and automatic blocking of speech currents from the pay station to the wanted subscribers station prior to payment and for the allowance of speech currents in both directions upon payment.
  • a telephone system comprising a pay station, a wanted subscribers station, an exchange, means in the exchange for the unidirectional blocking of speech currents from the pay station to the wanted subscriber, relay means disposed in the exchange for making said blocking means operative prior to payment and inoperative upon payment.
  • a telephone system comprising a pay station, a wanted subscribers station, an exchange, means in the exchange for the unidirectional blocking of speech currents, from the pay station to the wanted subscriber, relay means disposed in the exchange for making said blocking means operative prior to payment upon the sending of ringing current to the wanted subscriber and inoperative upon payment.
  • a telephone system comprising a pay station, a wanted subscribers station, an exchange, means in the exchange for the unidirectional blocking of speech currents from the pay station to the wanted subscriber, relay means disposed in the exchange for making said blocking means operative prior to payment upon the lifting of the wanted subscribers microtelephone and inoperative upon payment.
  • a telephone system comprising a pay station, a wanted subscribers station, an exchange, a direct current feed circuit from the exchange to the pay station, a switch included in the exchange in said circuit, automatic means for actuating said switch to open the circuit prior to payment and to-elose said circuit upon payment.
  • a telephone system comprising a, pay I station, a Wanted subscribers station, an exchange means for the establishment of a, connection between the pay station and the Wanted subsoribers set,'e1ectron valve means, autor matic means for including said valve means into said connection and assoc atlng the valve grid with the Wanted subscriber and the valve anode with the pay station prior to payment,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Prepayment Telephone Systems (AREA)
  • Meter Arrangements (AREA)
US522462A 1930-03-21 1931-03-13 Switching arrangement for telephone plants Expired - Lifetime US1868378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE374952X 1930-03-21

Publications (1)

Publication Number Publication Date
US1868378A true US1868378A (en) 1932-07-19

Family

ID=20309104

Family Applications (1)

Application Number Title Priority Date Filing Date
US522462A Expired - Lifetime US1868378A (en) 1930-03-21 1931-03-13 Switching arrangement for telephone plants

Country Status (5)

Country Link
US (1) US1868378A (zh)
BE (1) BE378412A (zh)
DE (1) DE610040C (zh)
FR (1) FR713496A (zh)
GB (1) GB374952A (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707724A (en) * 1952-10-07 1955-05-03 Automatic Elect Lab Coin control circuit for postpay telephone paystations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707724A (en) * 1952-10-07 1955-05-03 Automatic Elect Lab Coin control circuit for postpay telephone paystations

Also Published As

Publication number Publication date
BE378412A (zh)
GB374952A (en) 1932-06-20
FR713496A (fr) 1931-10-28
DE610040C (de) 1935-03-05

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