US1547456A - Trunk circuits for automatic telephone systems - Google Patents

Trunk circuits for automatic telephone systems Download PDF

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Publication number
US1547456A
US1547456A US324264A US32426419A US1547456A US 1547456 A US1547456 A US 1547456A US 324264 A US324264 A US 324264A US 32426419 A US32426419 A US 32426419A US 1547456 A US1547456 A US 1547456A
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United States
Prior art keywords
trunk
exchange
calls
selector
relay
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
US324264A
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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
Priority to NL8398D priority Critical patent/NL8398C/xx
Application filed by Automatic Electric Co filed Critical Automatic Electric Co
Priority to US324264A priority patent/US1547456A/en
Priority to DEA33927D priority patent/DE400385C/de
Priority to FR536351D priority patent/FR536351A/fr
Priority to US624159A priority patent/US1547956A/en
Application granted granted Critical
Publication of US1547456A publication Critical patent/US1547456A/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
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/08—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings
    • E05F1/10—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance
    • E05F1/1008—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring parallel with the pivot axis
    • E05F1/1016—Closers or openers for wings, not otherwise provided for in this subclass spring-actuated, e.g. for horizontally sliding wings for swinging wings, e.g. counterbalance with a coil spring parallel with the pivot axis with a canted-coil torsion spring

Definitions

  • My invention relates in general to auto matic trunk circuits, but more particularly to trunk circuits connecting more or less isolated or separated automatic exchanges, and has for its primary object the provision of means for handling a special case having-to do with the collection of tolls on incoming calls, although certain broad features may be found to be of utility for other purposes.
  • Fig. 1 is a layout of the relative position of a group of exchanges in which my invention may be best illustrated.
  • Fig. 2 is a diagram of the selective switching mechanism which is used to illustrate the features of my invention.
  • the reference characters A, B, and C represent three exchanges which may be located in three difierent towns. Vi e will assume that the towns in which exchanges B and C are located are relatively close together, or these exchanges may be in the same town or city. At any rate, they are so situated that a fiat rate for calling is in force for inter-exchange as well as local calls.
  • Exchange A however, is somewhatmore distant and while calls from exchange A to exchange B may carry no extra charge, there will be a toll charge for calls from exchange A to exchange C. lnter exchange as. wellas local calls are established automatically by the subscribers except that an operator may complete those calls which carry an extra toll charge.
  • the trunking may be described briefly as follows: At exchange A selector switches are provided as usual which are common to the subscribers and which are used during a preliminary stage in all connections, local or inter-exchange. Thus the selector S has access to local trunks and also to trunks extending to exchange B, one of which is shown in the drawing. This-trunk line terminates at exchange B in a selector S which may be termed a trunk selector to distinguish it from the local selector S which is similar to selector S at eXchange A. Se
  • lectors S and S have access in common to local trunks in exchange B and to interexchange trunks extending to exchange C. It will be seen now that subscribers in both exchanges haveaccess to trunk lines extending to exchange G. Since there is no extra charge for calls between exchanges B and C such calls are preferably established auto-v. matically, and to this end each trunk line is provided with a branch at exchange Cwhich terminates in an automatic switch. But there is a charge for calls from exchange A to exchange 0 which makes it necessary to route such calls thru an operator who can make appropriate record thereof. In order to take care of this latter class of calls a sec ond branch is provided for each trunk line which extends to an operators position.
  • the trunk extending from exchange B to exchange C terminates at the latter point in a switching device X which is adapted to connect.
  • the trunk line to the branch extending to jack J, or to the branch extending to the switch S The object of my invention is, specifically, the provision of automatic means at exchange C which is able to differentiate between calls from exchange A and calls from exchange B, and which is effective to dire-ct calls from exchange A to an operator and calls from exchan e B to automatic switches thru the medium of which the subscribers complete the desired'connections
  • the precise manner in which this is accomplished and the preferred embodiment of the invention. will be described more in detail hereinafter, reference being had to the accompanying drawing.
  • characters and 31 indicate the two line conductors of one of the trunk lines connecting exchanges B and C.
  • This trunk line terminates at exchange 13 in the repeating coil It thru the medium of which the trunk conductors are inductively connected to con-' ductors 8 and 9.
  • These latter conductors terminate in multiple contact sets in the banks of local selectors such asselectors S Fig. 1, and also extendto multiple contact sets in the banks of trunk selector 'such as the. selector S, Fig. 1.
  • one contact set comprisingcontacts 2, 3, and 4, which is located in the bank of a local selector; and another contact set comprising contacts 5, 6, and 7 which is located in the bank of a trunk selector.
  • test contact 3 is multipled to other local selectors but not to trunk selectors while similarly test contact 6 is multipled only to other trunk selectors.
  • the repeating coil R is provided thru the medium of which the trunk conductors 30 and 31 are inductively connected to conductors 32 and 33, which are normally connected to branch conductors 44 and 45 extending to jack J.
  • the other branch comprises conductors 42 and 43 which extend to a selector switch which may be the selector S Fig. 1. This latter branch is normally disconnected but may be substituted for the other branch by the operation of relay 37.
  • This latter relay pulls up and closes the well known holding circuit back to the selector S which extends from ground G by way of armature 16 and its working contact, winding of relay 20, and conductor 10 to bank contact 3, whence it continues by way of the test wiper of the switch thru a relay whose function it is to maintain the switch in operated position, and thence to the ungrounded pole of the battery.
  • relay 20 which upon energizing, completes a control circuit over the trunk line to exchange C as follows; ground at G thru the battery 13, working contact of armature 22 and the said armature, armature 18 and its working contact, working contact of armature 17 and the said armature, conductor 19, right hand windings of repeating coil R in parallel, trunk conductors 30 and 31 in parallel, left hand windings of repeating coil R in parallel, conductor 51, and windings of polarizedrelays 46 and 47 in series to ground G Upon the completion of the above circuit the direction of lay 47 is able to operate its armature, but polarized relay 46 remains inoperative. Relay 47 upon operating, com" pletesa circuit for the relay 36 which in turn closes acircuit for the slow acting relay 37. This relay, upon energizing, dis
  • Controlling impulses for operating the selector switch and subsequent switches, in exchange C are transmitted over the trunk line in the following manner: Then the subscriber at exchange; Boperates his calling device a series of interruptions are produced in the line circuit, thereby causing a corresponding series. of deenergizations of line relay 13. At each deenergization relay 13 breaks the control circuit extending to current flow is such that polarized re- 1 exchange "C, thereby causing the polarized relay 47 t0 deenergize a like number of times. Since relay 47 controls the circuit of relay 36, this relay also deenergizes a plurality of times and thereby produces a series of interruptions in the circuit which extends over the branch conductors 42 and 43 to the selector switch. Subsequent op-' erations of the calling device by the subscriber at exchange B will result in the operation of an additional switch or switches in exchange G whereby the connection will be completed to the desired line, all in the well known manner.
  • relay 21 Upon the completion of the connection, line relay 13 is energized, followed by the energization of relay 14, which relay closes the holding circuit back to the selector S the same as was described in the case of selector S except that now the relay 21 is included instead of relay 2()
  • relay 21 Upon energizing, relay 21 connects the battery B in the control circuit extending over the two conductors of the trunk in parallel to exchange C, where it includes the polarized relays 46 and 47. Batteries B and B have'different poles adapted for connection to the control circuit, or inother words, they have opposite v and will thereafter proceed as is usual in such cases, making proper record of the call, and then completing it to the called line in any suitable manner.
  • a trunk line In a telephone system, a trunk line, two classes of subscribers having access to said trunk line when calling, two outgoing branches of said trunk line, automatic selective means for routing calls from said trunk line via either of said branches, a pair of relays constituting said selective means, a. controlling circuit for said relays, a pair of batteries each adapted to operate a particular one of said relays, and means controlled according to the class of a calling subscriber for connecting one or the other of said batteries in said circuit.
  • an exchange comprising an operators position and a plurality of automatic switches, subscribers lines grouped at two outside points, means whereby subscribers in both groups can call said exchange automatically, and automatic means controlled by currents of different character for selectively switching such calls independent of control by the subscribers, whereby calls from one group of subscribers are directed to the operator and calls from the other group are directed to automatic switches.
  • a trunk line having two branches at one end thereof, subscribers lines grouped at two points, means whereby subscribers in both groups can connect with said trunk at the end opposite said branches and extend calls thereover, and automatic means controlled over two sides of said trunk line in parallel for selectively switching such calls independent of control by the subscribers, whereby calls from onev group of subscribers are extended over one branch of said trunk line and calls from the other group'are extended over the otherbranch.
  • a trunk line branches of said trunk line at one end there of, one branch extending to,- an operators position and the other branch terminating in an automatic switch, two selector switches having access to said trunk at the opposite end thereof, and means for always signalling the operator'via one of said branches when the trunk is seized by a particular. one of said selectors and for always operating said automatic switch when the trunk is seized by the other ofsaid selectors, said means controlled by currents of different character.
  • a trunk line having two branches at one end thereof and a simplex circuit superimposed thereon, one branch being normally connected and extending to an operators position and the other branch being normally disconnected and terminating in an automatic switch, two selector switches having access to said trunk at the undivided end thereof, and automatic means controlled over said superimposed circuit for completing the connection to the operator via the said connected branch whenever the trunk is seized by a particular one of said selectors, and for connecting the said normally disconnected branch and for disconnecting the other branch whenever the trunk line is seized by the other of said selectors.
  • a telephone system a trunk line having two branches at one end thereof, two selector switches having access to said trunk at the other end, a circuit superimposed on the conductors of said trunk line and including at the divided end of the trunk two relays for controlling extensions of said trunk over its two branches, respectively, two separate batteries at the o her end of said trunk for separately operating said relays, and means whereby each of said selectors when it seizes the trunk line includes a particular one of said batteries in the said circuit.
  • a trunk line having two branches at one end thereof, two selector switches having access to said trunk at the other end, a ground return circuit superimposed on the conductors of said trunk line, two polarized relays included in said circuit at the divided end of said trunk for controlling the connection of said trunk .vith its two branches, respectively, two batteries at the other end of said trunk having opposite poles grounded, and means whereby each of said selectors when it seizes the a particular one of said relays.
  • an exchange comprising an operators position and a plurality of automatic switches, second and third exchanges each having subscribers" lines terminating therein, a trunk line accessible to subscribers lines in the second exchange and extending to said third exchange, another trunk line accessible to calls coming over said first trunk and also to subscribers in said third exchange, the said second trunk constituting means whereby subscribers in either the said second or third exchanges can call the said first exchange,
  • a trunk means for connecting any line with said trunk at the incoming end thereof, two branches of said trunk at the outgoing end, discriminating mechanism at, the incoming end of said trunk sensitive to the class to which a connected line belongs, and switching mechanism at the distant end controlled over a talking conductor of said trunk by said discriminating mechanism for routing all calls from lines of one class via one of said branches and all calls from lines of the otherclass via the other of said branches.
  • a trunk line having two branches at the incoming end, an automatic selector switch having access to the first branch only, a second automatic selcctor'switch having access to the second branch only, two branches at the outgoing end of said trunk line, means including said selectors for extending calls over said trunk line, and cooperating means atopposite ends of said trunk line for insuring that all calls reaching the trunk line by way of one selector will be routed away from said trunk line via a particular branch at the distant end and that all calls arriving by way of the other selector will be routed via the other branch at the distant end.
  • a trunk line having two branches at one end thereof, automatic switching inechanismfor connecting a calling line with said trunk line at the other end, a circuit including the two talking conductors of said trunk line in parallel, and switching means at the junction of said branches controlled automatically over said circuit responsive to the establishment of said connection for routing the call over a particular one of said branches.
  • a trunk line having two branches at the incoming end and two corresponding branches at the outgoing end, automatic switches torextending calls over said trunk line, a circuit including the two talking conductors ofsaid trunk line in parallel, and mechanism at the outgoing end of said trunk line controlled over said circuit from the incomingend for automatically and selectively switching said calls, said mechanism including means for routing eachcall away from the trunltover the outgoing branch corresponding to the incoming branch inuse.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)
US324264A 1919-09-18 1919-09-18 Trunk circuits for automatic telephone systems Expired - Lifetime US1547456A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL8398D NL8398C (de) 1919-09-18
US324264A US1547456A (en) 1919-09-18 1919-09-18 Trunk circuits for automatic telephone systems
DEA33927D DE400385C (de) 1919-09-18 1920-08-13 Schaltungsanordnung fuer Fernsprechanlagen, in welchen Teilnehmer verschiedener AEmter dieselben Verbindungsleitungen benutzen
FR536351D FR536351A (fr) 1919-09-18 1920-09-17 Perfectionnements aux circuits de raccordement pour systèmes téléphoniques automatiques
US624159A US1547956A (en) 1919-09-18 1923-03-10 Combination door closer and stop

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US324264A US1547456A (en) 1919-09-18 1919-09-18 Trunk circuits for automatic telephone systems

Publications (1)

Publication Number Publication Date
US1547456A true US1547456A (en) 1925-07-28

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ID=23262819

Family Applications (1)

Application Number Title Priority Date Filing Date
US324264A Expired - Lifetime US1547456A (en) 1919-09-18 1919-09-18 Trunk circuits for automatic telephone systems

Country Status (4)

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US (1) US1547456A (de)
DE (1) DE400385C (de)
FR (1) FR536351A (de)
NL (1) NL8398C (de)

Also Published As

Publication number Publication date
DE400385C (de) 1924-08-06
FR536351A (fr) 1922-05-01
NL8398C (de)

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