US1474648A - Automatic telephone system - Google Patents

Automatic telephone system Download PDF

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Publication number
US1474648A
US1474648A US414080A US41408020A US1474648A US 1474648 A US1474648 A US 1474648A US 414080 A US414080 A US 414080A US 41408020 A US41408020 A US 41408020A US 1474648 A US1474648 A US 1474648A
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US
United States
Prior art keywords
switch
relay
trunk
circuit
test
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
US414080A
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English (en)
Inventor
Smith Arthur Bessey
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.)
Automatic Electric Co
Original Assignee
Automatic Electric Co
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 Automatic Electric Co filed Critical Automatic Electric Co
Priority to US414080A priority Critical patent/US1474648A/en
Priority to FR541836D priority patent/FR541836A/fr
Priority to DEA36394D priority patent/DE393561C/de
Priority to US549730A priority patent/US1528751A/en
Priority to FR27796D priority patent/FR27796E/fr
Priority to DEA39742D priority patent/DE412664C/de
Application granted granted Critical
Publication of US1474648A publication Critical patent/US1474648A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Definitions

  • My invention relates in general to automatic telephone systems and more specifically to an improved type of secondary line switch or secohdary nonnumerical rotary.
  • trunk lines usually terminate in incoming line switches in the mainv exchange which are operated to aut0mat1- cally select one of a plurality of selectors in the main exchan 'e. 1
  • ob ects of my invention are, to provide an improved type of rotary switch for use in such a system and one which materially speeds up the service. Also I provide a simple type of secondary line switch which has a new and highly'improved method of testing and operating.
  • the improved line switch which I have devised perm'its'the selector which seizes it to test not only the 'line switch but also to test the trunk line upon which the line switch stands. 7
  • a calling stationA of the usual automatic type comprising the usual talking equ1p ment and a calling device of the standardtwo wire Stowger type, having individual thereto a line switch C of standard rotary type whose wipers have no normal position and which stand on the trunk line last used.
  • This line switchC has access to a plurality of first selector switches such as that shown In Fig. 2 I have shown at'E a secondary -line switch of my improved t pe which is accessible to the selector D. ig. 1) from one level. It is to be understood that the selector D has access to connector switches of standard type. from other levels of its bank for calls local to its own exchange.
  • This line switch E is similar in its mechanical construction to the line switch C (Fig. 1) in that it has wipers which move onl in one direction and which normally stan on the trunk line last used. The circuits for controlling. this switch E difl'er materially from those of the switch C- however, and will be described in detail later on. I
  • This line switch E has access to selector switches of standard type such as thatzshown at F which in turn may connect through other selectors and connectors to called-subscribers line.
  • Relay '8 energizes over the As soon as an idle trunk line series circuit including the calling line and operates to close a circuit for slow release relay 9, which in turnoperates to the release trunk to hold the line SWItCh' C ound ground at springs of relay 9 through springs 12 and 13, through ofi' normal springs 14, as soon as the first vertical step is taken, and
  • Relay 15 pulls up to close one point at springs 16 in the circuit of rotary magnet 17 and locks itself energized from ground through springs 18 and springs 19 of rotary magnet 17,
  • selector D will be operated to some level in which are located trunks leading to connector switches in the branch exchange or to second selectors, and the call will proceed in the usual manner. However, assuming that the called party is located in some other exchange, then selector D will be operated to the level in which the trunk lines leading to that exchange are located.
  • Magnet 17 operates to step the wipers into connection with the first trunk line in the level and opens the circuit of relay 15 at springs 19.
  • Relay 15 in turn falls back and opens the circuit of the rotary magnet at springs 16.
  • the private wiper 21 now rests on the private contact of the trunk line leading to the first of the rotary switches E and as soon as magnet 17 falls back a new circuit is closed for relay 15 extending from battery through said relay, springs 14, springs 19, springs 22 and 23, wiper 21, contact 24, conductor 25, low resistance upper winding of relay 30, and private wiper 35 of switch E.
  • Another branch of this circuit may be traced through high resistance 36, and lower high resistance winding of relay 30 to battery.
  • Relay 30 is so wound that both windings assist each other at this time and relay 30 will therefore attract its armature to close the springs 37 and 38 in the talking circuit, thereby completing the circuit of line relay 44 of selector F.
  • the above traced circuit of relay 30 now is changed over by the attraction of armature 39 and is as follows, ground over wiper 21, conductor 25, springs 40 and 41, spring 39 and lower winding of relay 30 to battery, a branch of this circuit also passes from springs 41 through relay 33 to battery.
  • Relay 30 is therefore held energized by its lower winding and as soon as line relay 44 of switch F energizes and in turn operates slow relay 42 then ground will be supplied through springs 43 of said relay over the release trunk and wiper 35 to hold relays 3O 1 and 33 energized, andv to hold switches (l and D in operated position.
  • the selector F may now be controlled, in the same manner as was the selector D, in accordance with the second digit of the called number to extend the connection on toward the called party.
  • a common or master relay 32 the purpose of which is to maintain one of the group of switches E always in connect1on with an ldle trunk line.
  • This relay 32 has a circuit controlled by a chain of relays 33, 34, etc., one of which is individual to each switch E. It will be seen that relay 33 will be energized whenever the switch E is either in use or is resting on a busy trunk line. Now when all of the relays 33 and 34, etc., are energized, that is when all switches E are inaccessible to selectors D, then the circuit of relay 32 will be completed by these chain relays and will operate to connect battery to one side of all the rotary magnets 31 of the switches E. Now it will be seen that any switch E which is in use will have the circuit of its magnet 31 opened at springs of relay and will therefore not be a ected in any way.
  • I11 a telephone system, a nonnumerical switch having wipers which normally stand on the trunk line last used, a selector for seizing said line switch, and means for preventing the seizure of said switch whenever the switch is busy or whenever the switch is idle and the trunk line upon which the wipers are standing is busy.
  • a nonnumerical switch having wipers which normally stand;- on the trunk line last used, a selector for seizing said line switch, and means for causing said switch to test busy to said selector whenever it is in use and also whenever it is idle but is standing on a busy trunk line.
  • a nonnumerical automatic switch having trunk lines accesslble thereto and wipers whlch always stand on one of sald trunk lines, and means for making said switch busy whenever the trunk line upon which the wipers are standing is busy.
  • a nonnumerical automatic switch having trunk lines accessible thereto and wipers which always stand on one of said trunk lines, means for making said switch busy whenever the trunk line upon which the wipers are standing is busy, and means controlled from the trunk line upon which the wipers are standing for causing said switch to automatically select an idle trunk line.
  • a telephone system a group of non-L numerical switches, trunk lines, accessible] thereto, said switches each having wipers ,12'0 which normally stand on the contacts of one of said trunk lines, and means common to said switches for maintaining one of said switches always in connection with an idle trunk line while other of said switches are standing on busy trunk lines.
  • said switches each having wipers which normally stand on the contacts of .one
  • nonnumerical switches trunk lines accessible in common to said switches wipers for said switches normally standing on a plurality of said trunk lines, and means controlled when the trunk lines upon which all of the switches are standing are busy for causing an idle switch to automatically rotate in search of an idle trunk.
  • a nonnumerical switch In a telephone system, a nonnumerical switch, a test wiper for said switch and a test contact therefor, a relay for said switch. a circuit for said relay including the test contact and the test wiper, another circuit including only said test contact, and a branch circuit for rendering the first circuit inoperative and the second circuit operative.
  • a test circuit for the switch including the test wiper and contact, a relay connected to said test circuit, means for applying a guarding potential to said test wiper while the switch is idle, ,means for making said testcontact test busy and for preventing any operation of said relay whenever said guarding potential is connected to said .wiper, and means for operating said relay whenever the switch is tested and no guarding potential is present on said test wiper.
  • a plurality of auton'iatic switches in a telephone system, a plurality of auton'iatic switches, trunk lines accessible in common to said switches, wipers for said switches which normally stand oira plurality of said trunk lines, means fo'i making all of the trunk lines upon which the use.
  • '1 17 ha telephone system a series of autoswitchesare standing busy, and means controlled by the busy condition of all of said trunk lines for causing s'omeof said switches to automatically operate to find an idle trunk independent of the seizure of any of the switches.
  • a non-numerical trunk hunting switch having a test wiper and line wipers which normally stand on the corresponding contacts of a trunk, said switch having a test conductor and line conductors corresponding respectively to said wipers, said test conductor being normally conductively connected with said test wiper, means. for seizing said switch, and means controlled over said test conductor for preventing the seizure of said switch regardless of whether said switch is busy or idle when a busy potential is impressed upon the test contact upon which said test wiper is standing.
  • test contact individual to the second switch accessible to the test Wiper of the first switch, a test contact individual to said trunk line engaged by the test wiper of said second switch, a'nda metallic connection between the test contact andtest wiper of said second switch, whereby the said first switch may be operated to test the said trunk line by way of said test contacts and test wipers.
  • means including two directively controlled switches for completing a connection, a non-directive hunting switch interposed between said switches, and circuit connections including a wiper of said hunting switch to enable the first directive switch'to'testthe second directive switch and determine whether' the same is busy or idle.
  • a plurality of automatic trunk hunting switches each having a test wiper, a motor magnet in each switch having one terminal normally connected to the associated test wiper, the other terminals of said magnets being'normally disconnected, means for connecting a source of current to the said test wipers when the trunks on which said wipers are standing become busy, and means for connecting the normally disconnected terminals of said magnets to said source to cause said switches to hunt for idle trunks.
  • a plurality of automatic trunk hunting switches each having a test Wiper, a motor magnet in each switch having one terminal normally connected to the associated test Wiper, the other terminalsof said magnets being normally 1 disconnected, means for connecting a source of current to the said test wipers when the trunks on which said Wipers are standing become busy, and means including a relay common to all of said trunks for connecting the normally disconnected terminals of said magnets to said source to cause said switches to hunt for idle trunks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Relay Circuits (AREA)
US414080A 1920-10-01 1920-10-01 Automatic telephone system Expired - Lifetime US1474648A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US414080A US1474648A (en) 1920-10-01 1920-10-01 Automatic telephone system
FR541836D FR541836A (fr) 1920-10-01 1921-09-30 Commutateur de ligne secondaire rotatif
DEA36394D DE393561C (de) 1920-10-01 1921-10-02 Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb, bei denen Nummernstromstossempfaenger ueber Zwischenwaehler Zugang zu grossen Gruppen von Leitungen haben
US549730A US1528751A (en) 1920-10-01 1922-04-05 Telephone trunking system
FR27796D FR27796E (fr) 1920-10-01 1923-03-22 Commutateur de ligne secondaire rotatif
DEA39742D DE412664C (de) 1920-10-01 1923-04-06 Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US414080A US1474648A (en) 1920-10-01 1920-10-01 Automatic telephone system
US549730A US1528751A (en) 1920-10-01 1922-04-05 Telephone trunking system

Publications (1)

Publication Number Publication Date
US1474648A true US1474648A (en) 1923-11-20

Family

ID=24194174

Family Applications (2)

Application Number Title Priority Date Filing Date
US414080A Expired - Lifetime US1474648A (en) 1920-10-01 1920-10-01 Automatic telephone system
US549730A Expired - Lifetime US1528751A (en) 1920-10-01 1922-04-05 Telephone trunking system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US549730A Expired - Lifetime US1528751A (en) 1920-10-01 1922-04-05 Telephone trunking system

Country Status (3)

Country Link
US (2) US1474648A (de)
DE (2) DE393561C (de)
FR (2) FR541836A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE508254A (de) * 1951-01-22
GB2452036A (en) * 2007-08-20 2009-02-25 Adrian John Laurence Scarsbrook Baby restraining device for use with a baby changing mat

Also Published As

Publication number Publication date
FR27796E (fr) 1924-08-18
DE393561C (de) 1924-04-05
DE412664C (de) 1925-04-25
US1528751A (en) 1925-03-10
FR541836A (fr) 1922-08-02

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