US1855074A - Switching arrangement in telephone plants - Google Patents

Switching arrangement in telephone plants Download PDF

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Publication number
US1855074A
US1855074A US522403A US52240331A US1855074A US 1855074 A US1855074 A US 1855074A US 522403 A US522403 A US 522403A US 52240331 A US52240331 A US 52240331A US 1855074 A US1855074 A US 1855074A
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United States
Prior art keywords
microphone
current
relay
rectifier
contact
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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US522403A
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English (en)
Inventor
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
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Telefonaktiebolaget LM Ericsson AB
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Filing date
Publication date
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Publication of US1855074A publication Critical patent/US1855074A/en
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Expired - Lifetime legal-status Critical Current

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    • 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 the switching oftalking connection in telephone plants in which one or all of the speaking devices during a certain period of time are adapted to be made inoperative. This is the case for example in so called paystations or coin collector telephone stations to which the present invention is particularly applicable.
  • the pay stations hitherto used are generally so disposed thatthe calling person upon his callingup the exchange enters into communication with an operator who in turn calls up the wanted subscriber,waits for his reply, controls that the-correct subscriber has been called, requests the calling person to pay the fee, and finally controls the payment. Thereupon the calling person is connected to the called subscriber.
  • This known arrangement has, however, the inconvenience that the time of the operator-is engaged too much which in turn necessarily makes the charges comparatively elevated for a call from apay station.
  • To reduce the work of the operator it has been proposed to equip the pay station with mechanical devices of such a nature that the calling person only by inserting his coin is enabled to call up the telephone exchange, the coin simultaneously short-circuiting the microphone by means of a contact.
  • a numberof rectifiers are connected into circuit for this purpose.
  • the invention is applicable both to pay stations having COlIl'COllGCtOI' and to pay stations having call meters in which former case the calling person must drop the'prescribed amount into the coin box by actuating his paying device'whereas in the-latter case he must actuate the call meter before talking connection may be established.
  • the invention will be more closely de scribed with reference to the accompanyingdrawings, Figures 1 and 2.
  • the telephone apparatus is substantially connected up-in a manner known per se but provided with two rectifiers L and L In the one line branch there is included a high resistance R which normally is short circuited by the paying or debiting device D.
  • a and B are the current feed relays of the apparatus, BR its cut ofirelayyfor calls, and SVR its current reversing relay.
  • the apparatus in Figure l operates in the following manner.
  • the microtelephone When the microtelephone is lifted the following current path is formed.
  • Parallelly across the rectifier L and the microphone M the rectifier L is con nected up in such a manner that it blocks current in the direction just mentioned.
  • the relays A and B are energized.
  • the call indicating lamp AL islighted over the contacts 5 and 6. 'When the operator replies by inserting the plug SS in the jack SJ the following current path is formed.
  • the relay SVR is so adjusted that it does not attract its armature for this current whereasthe relay. BR attracts its armature and opens its contact 6,
  • the winding L of the relay SVR is so adjusted that the appertaining armature is attracted for this current and receives holding current over the followingv current path.
  • the plus pole,the resistance P, the contact 8, the winding H Also the contacts 1 and 1 are opened whereas the contacts and 11 are closed which results in that the current direction through the pay station isreversed the following current path being then estab- .li'shed.
  • the microphone M will then be devoid of. current because it is series connected with the rectifier L in its locking direction and is shunted by the rectifier L in its direc-
  • the called subscriber replies the calling person is .able to hear his voice but may not speak with him before he actuates his debiting or paying device D, the contact at D being then opened and theresistance R connected up in series with the line, i
  • the current is then reduced for a moment so that the relay A is de-energized whereas the relay'B holds its armature. Then the following current path is established.
  • the resistance P, andthe plus ThewindingH of the relay SVR is Q then short-circuited which results in that the relay SVR is deenergized.
  • the contacts 10 and 11 are opened andthecontacts 1 and 4 closed so that the current through the pay station is reversed
  • the microphone is d again passed by current and the calling person isenabled to speak with the called subscriber.
  • Figure 2 shows diagrammatically another switching arrangement according to the in vention. Aconnection completed by an operator or automatic selectorsis shown just 7 before a called subscriber AA lifts his microtelephone. The current paths present then noidifferences from an ordinary talking connection. When the called subscriber lifts his microtelephone the following current path is formed. The plus pole, the one Winding of therelay BSS, theline branch at, the called I subscribers station, the line branch b, the c the other winding of the relay BSS, and the minus'pole. The relay BSS is energized the followingvcurrent path being then formed. The plus pole, the contact 5, the relay SVR,
  • the relay SVR is energized the contacts 1 and 2 opened and the contacts 3 and 4 closed which results in that the current through the pay station isreversed and the following current path established.
  • the microphone M will now be currentless for the same reason as is above stated in conjunction with Figure 1.
  • the calling person is thus ablectohear the voice of the call-ed subscriber but maynot speak with him before he actuates his paying device, the contact D being then opene'd and the resistance R connected in series with the line.
  • the current isithen reduced fora mo..- inent so that the relay A is deenergized whereas the relay B holds its armature.
  • the following current path is then established.
  • the relay TB is energizedand receives holding current over the contacts 10, 11 and 9'until both subscribers. have hooked up their inicrotelephones. Further therelayT opens its contact 6 which results in that the relay SVR is deenergized.
  • the c0ntacts'3- and 4; are opened and'the contacts 1 and 2 closed so that the current through the pay station is .re-
  • rectifiers having a more ideal operation it is sufficient to use only one rectifier which then may be disposed either with series or in shuntwiththe microphone, due consideration being taken to the correctness of the direction'of'unobstructed current passage.
  • the invention is not restricted to the above described purposes but maybe applied in a plurality of other switching arrangements where it is desirable to'render circuits current carrying or currentless .by reversingthe current direction.
  • a coin collector telephone station comprising a microphone, a microphone current source, rectifying means for blocking microphone current of the one direction, means for connecting the current source to the microphone in the blocking direction prior to payment, and means for connecting the current source to the microphone in the reversed direction upon payment;
  • a telephone pay station comprising a microphone, a debiting device, a microphone current source, rectifying means for blocking microphone current of the one direction, means controlled by the debiting device for connection of the current source into blocking direction prior to actuation of the debiting device and automatically into reversed direction subsequent to actuation of the debiting device.
  • a coin collector telephone station comprising a microphone, a coin operated debiting device, a microphone current source, rectifying means for blocking microphone current in the one direction, means controlled by the debiting device for associating the current source with the microphone in blocking direction prior to payment and automatically into reversed direction upon actuation of the debiting device.
  • a telephone pay station comprising a microphone, a microphone current source, a rectifier series connected with the microphone, means for connecting the current source to the microphone in the blocking direction of the rectifier prior to payment, and means for connecting the current source to the microphone in the direction of unobstructed passage through the rectifier upon payment.
  • a telephone pay station comprising a microphone,'a microphone current source, a rectifier connected across 'the microphone,
  • a telephone pay station comprising a microtelephone, a microphone current source, a rectifier series connected with the microphone, another rectifier connected across the microphone and the series connected rectifier, the blocking direction of the series connected rectifier being reversed to that of the shunted rectifier, means for connecting the current source to the microphone in the blocking direction of the series connected rectifier prior to payment and automatically in the blocking direction of the shunted rectifier upon payment.
  • a debiting device in combination with a'telephone exchange comprising a microphone current source, and switching means for connecting the current source to the microphone in the blocking direction prior to actuation of the paying device and in the reverse direction upon actuation of'the debiting device.
  • a telephone pay station comprising a microphone, rectifying means for blocking microphone current of the one direction, and a debiting device, in combination with a telephone exchange comprising a microphone current source, and switching means for connecting the current source to the microphone in the blocking direction prior to actuation of the paying device and in the reverse direction upon actuation of the debiting device and finally two Wires connecting the pay station with the exchange.
  • a telephone pay station comprising a microphone, rectifyingmeans for blocking

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)
  • Prepayment Telephone Systems (AREA)
US522403A 1930-03-21 1931-03-13 Switching arrangement in telephone plants Expired - Lifetime US1855074A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE355182X 1930-03-21

Publications (1)

Publication Number Publication Date
US1855074A true US1855074A (en) 1932-04-19

Family

ID=20308759

Family Applications (1)

Application Number Title Priority Date Filing Date
US522403A Expired - Lifetime US1855074A (en) 1930-03-21 1931-03-13 Switching arrangement in telephone plants

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US (1) US1855074A (en(2012))
BE (1) BE378411A (en(2012))
DE (1) DE552018C (en(2012))
FR (1) FR713495A (en(2012))
GB (1) GB355182A (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519867A (en) * 1947-05-22 1950-08-22 Automatic Elect Lab Restricted service telephone system
US2593419A (en) * 1939-05-24 1952-04-22 Int Standard Electric Corp Class of line indication in telephone systems
US3474193A (en) * 1967-02-01 1969-10-21 Northern Electric Co Postpay telephone paystation circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593419A (en) * 1939-05-24 1952-04-22 Int Standard Electric Corp Class of line indication in telephone systems
US2519867A (en) * 1947-05-22 1950-08-22 Automatic Elect Lab Restricted service telephone system
US3474193A (en) * 1967-02-01 1969-10-21 Northern Electric Co Postpay telephone paystation circuit

Also Published As

Publication number Publication date
FR713495A (fr) 1931-10-28
GB355182A (en) 1931-08-20
DE552018C (de) 1932-06-08
BE378411A (en(2012))

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