US1771842A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US1771842A
US1771842A US221878A US22187827A US1771842A US 1771842 A US1771842 A US 1771842A US 221878 A US221878 A US 221878A US 22187827 A US22187827 A US 22187827A US 1771842 A US1771842 A US 1771842A
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US
United States
Prior art keywords
relay
circuit
bridge
operator
sleeve
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
US221878A
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English (en)
Inventor
Thomas F Crocker
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Reserve Holding Co
Original Assignee
Reserve Holding 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 BE354512D priority Critical patent/BE354512A/xx
Application filed by Reserve Holding Co filed Critical Reserve Holding Co
Priority to US221878A priority patent/US1771842A/en
Priority to GB27534/28A priority patent/GB297747A/en
Application granted granted Critical
Publication of US1771842A publication Critical patent/US1771842A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M5/00—Manual exchanges
    • H04M5/10—Manual exchanges using separate plug for each subscriber

Definitions

  • the present invention relatesto telephone systems ingeneral, but is concerned more particularly with cord circuits and trunk circuits used in giving toll service 'to the subscribers of an automatic telephone exchange.
  • This invention is an improvement on my prior application Serial No. 161,514, filed January 17, 1927, particularly with reference to the feature in the'prior application involving the arrangement whereby the dialling keys and other keys are common to allthe cord circuits of an operators position.
  • One object of the invention is the produc tion of suitable apparatus whereby the amount of workperformed by the operator is reduced. This is accomplished byremoving the cord-splitting contacts from the dial keys and placing them on suitably-controlled relays. Inthis way,'one or the other of the two dial keys may be left thrown all thetime, with the result that the proper cord-splitting relay operates at the proper time. to cause the impulses from the operators dial to be transmitted over the end of her cord circuit indicated by which of the two dialling keys is .left operated. I v
  • This object isobtained by providing a short-circuiting relay to short circuit the receiver of the operatorunder the arrangement-being such that the sleeve of the plug contacts with the sleeve of the jack and causes her receiver to be short 'circuited before the tip and ring contacts of the plug and jack have been brought together.
  • a feature of the present arrangement in connection with the operators headset is that the operators receiver is maintained short circuited by relays controlled by off-normal contacts of the calling device for an interval following the operation of the calling device in order to permit a'selector, operated by the train of impulses just sent out, to complete its hunting operation and switch through so as to avoid disagreeable clicks in the operators receiver when the switching through opsults in the closure of an alternate holding circuit during the ringing operation, whereas the holding circuit is not closed by the same action of the sleeve relay during dial-.
  • Another object of the invention is the production of novel circuit arrangements in connection withthe operators cord circuit for timing a conversation and warning the operator when the subscribers have conversed for a predetermined length of time, three min-- utes, for example.
  • the/operator is provided with a starting pushbutton (common to her several cord circuits) which she operates whenthe conversation begins. timed to operate at the end of the predetermined interval, operates to signal the operator at the end of such interval.
  • Fig. 1 shows a cord circuit at a toll-operators switehs board together with a jack-ending toll line at the left and'a toll service trunk at the right.
  • the toll line may be one extending to a distant city.
  • the toll service trunk is a trunk line leading to a toll servicetrunking system such as, for example, the one shown in the Wicks Patent #1,633,149, granted June Fig. 2 shows the position equipment, common to all the cords of the switchboard, including the various keys and relays and the operators headset.
  • the circuit of relay 1.02 at this time includes contacts'of the ringing key, contacts of the talking key, contacts of relays 107- and. 106 and the supervisory lamp 103 and resist ance 104 in parallel.
  • the lamp 103 however is not lighted owing to the relatively high resistance of relay 102.
  • the operator Having inserted the plug P into the jack J the operator operates her talking key in the cordcircuit so as to be able to converse with the calling operator.
  • the talking key When the talking key is thrown, it connects the tip and ring conductors of the answering plug to the common conductors 131 and 132 leading to the position equipment shown in Fig. 2, and it disconnects the sleeve of the plug P from the associated equipment in the cord circuit and extends it over conductor 133 to the holding circuitincluding resistance 202 Fig. 2, and contacts on certain of the common keys.
  • the tip and. ring strands of the plug P having been connected over conductors 131 and 132 and through contacts of the cord splitting relay 201 to the tip and ring conductors with the calling operator and ascertainthe destination of the call. 4
  • relay 108 As a further result of the operation of the talking key, relay 108, Fig. 1, is operated and it divides the cord into two sections, connecting the tip and ring strands ofthe calling plug P over conductors 13 1 and 135 to the position equipment shown in Fig. 2.
  • Relay 108 also disconnects the sleeve of the plug P from the associated supervisory lamp 112 and, assuming the dial call key to be normal, connects it over conductor 136 to the common holding resistance 203, Fig. 2, through contacts of certain of the common keys.
  • thev sleeve conductor 136 of the common apparatus is extended through contacts of thedial call key, contacts of the off-normal relay 209, associated with the calling device CD, and contacts of relay 205 to the upper winding of relay 207 for purpose which will appear presently.
  • the operator inserts the plug P of the cord circuit into the jack of an idle toll-service trunk, the jack J for 8X- ample.
  • the tip of the plug makes contact with the tip of the jackbefore the ring of the plug makes contact with the ring of the ack, due to the usual plug and jack construction, whereupon the upper spring contacts of the jack are closed by the associated tip springs, grounding the upper terminal of sleeve relay 115.
  • This ground potential is transmitted through relay and the sleeve of the jack to the sleeve of the plug, causing the quick acting relay 207 Fig.
  • Sleeve relay 115 of the trunk line energizes at this time and closes a bridge across conductors l20'and 121through the lower winding of relay 116 and the winding of relay 119.
  • Relay 119 energizes through the line relay (not shown) of the switch to which the toll-service trunk extends, but the electropolarized relay 116 does not operate at this l il trunk.
  • ⁇ relay119 closesa parallel holding. circuit acrossconductor's 120 an d 121 through. the resistance .118,: at the same time removingsthershunt fromlaround the associated condensers. .These condensers, 'itmaybe,pointedout, are otasufiicientcapacity.
  • Relay-3 1194 remains operated byv currentLflowr throughiiittin multiple with the holding resistancefllS.
  • acircuit is closed for-the. slowsacting-zrelay .206.
  • Relay 206 thereupon operatesandcloses a multiple shunt around'the:.operator?s-receiver inv addition, to closinga .circuititor. relay ,205 through 5 the ,resistance .208.
  • FRelay 208 operates andlocksitseltto the sleeve extended conductor, at the. same time joining the two terminals of the l lower winding of relays 1207. together ,and .openinggthe circuit throughlthe upper winding of the relay.
  • Relay 207 being quick to v pull ,up initially, as above pointedout-,I is.-.now..”slo'w .to.
  • E'Iheresistance 208 is included in ,the initiahoperating .circuit of the relay :205 so as to avoid shunting the sleeve relayf115Iin the ,to'll service: trunk By the time the relays 205.'z2.07.have gone through the-above.
  • Relay- 209 operates 'inseries with, the'Ic'ut-oii relay'20l and opensthe extended sleeve circuit, permitting the sleeve relay 115 in thetoll service trunk Fig. 1 to; fallback.
  • Belay 205 remains operatedfdue to' the. circuit closed' for it through resistance 208' by relay .206. 1When relay falls-back, it opens the circuit through the lower winding ofre'lay 116 and the winding of relay 119, whereupon relay/119 falls back 'and short circuits the associated condensers, at the same'tirne re- :rnovi ng the bridge includingresistance 118 rfrom across conductors and 121.
  • Relay 119 now energizes'iin multiple with the" loop' through the operatorsheadset and the calling device CD, .Fig. 2, and closes the local multiple bridge through resistance'118, at the same time reinserting the associated "condensers the calling device CD reaches its normal position, with the result that relay 207 falls back after an interval, being rendered slowacting by the closed circuit through itslower winding.
  • relay 207 opens the circuit of the slow acting relay 206, with the result that relay 206'falls1back after aninterval and removes the shunt from around the associated condenser in the talking circuit, at the same time opening the local locking circuit for relay 20-3 andremoving the shunt from around the operators telephone.
  • the circu'ithaving become stabilized in the meantime, with no current-flow in the operators circuit, no click is heard.
  • Relay 205 remainslocked upxover the extended sleeve circuit. 1 V
  • the busy tone is heard by the operator after the complete number is dialled, and she-may release the connection by withdrawing the plug P from the jack J Assumingthat the called line isidle,"the connector in use seizes the called line and initiates operationswhich result in a reversal of the current fiowlin conductors 120 and 121. This takes place after relays'115 and 119, of the trunk have reoperated,but before the operators relays 207 and 206 have fallen back.
  • relay 116 When this reversal occurs, relay 116 operates as the current flows in its windings now assist each other, and relay 119 falls back momentarily owingto the fact that the magnetism in its magnetic circuit must die down to zero and build up againin the opposite direction when the current flow is're; versed. If it were not, for the presence of the bridge including resistatnce 118 across the trunks through contacts of relay 119, the
  • the sleeve circuit of the plug P is now transferred back to the supervisory lamp 112 whereupon the lamp 112 becomes lighted over the sleeve circuit in series with the lower winding of the sleeve relay115, the upper winding of-thisrelay being now shunted by the relays 116*and 119.
  • the operator is informed'that the called'line is idle and has been seized.”
  • the operator throws the ringing key associated with a plug P whereupon ringing current is transmitted over the tip and ring conductors of the jack J
  • the shunt is removed from around the resistance 11 1 by the ringing key, extinguishing the lamp 112 and causin the sleeve relay 115 to fall back.
  • the resistance 114 must not be sohigh as to cause the deenergi'zati'on of a tool-line sleeve relay such as 102associated with the jack J As 'a result, the resistance is high enough to cause the sleeve relay to fall back when its upper winding is shunted, but not otherwise.
  • Theup'per' win'ding of the relay is shunted at this'time by the contactslof relays 116 and 119.
  • the sleeve relay falls back, it grounds the lower conductor 121 through contacts ofrelay 116, at the same time opening the -bridge throughthe lower winding of relay'116 and relay 119.
  • Relay 116 remains operated by the current flow throughits'upper winding alone.v Relay 119 however, falls backfshuritgfthe associated condensers, and would remove the shunt from around the up per winding of relay 115 were it not forthe upper'contacts o f relay 115 which closes a multiple pointin itsown shunt circuit. The ringing current now passes out over the up-. per conductor. 120 to the switch train and causes the: automatic signalling of the called subscriber to start in a manner explained in the /Vicks patent herein'before referred to.
  • relay119 removesthe shunt from around the ,upperwinding of relay 116, thereby extinguishing the supervisory lamp 112, which I I does not remain lighted in series" with the entire winding of the sleeve relay.
  • Be lay 115 also-clo'ses a groundreturn' circuit at its lowercontact to conductor 121 so as; to afiord a return path'for the-highlvoltage- I current under certainiconditionsfofthe switch lay 109 to close" whereupon the supervi trainarid-0 aroma "taming circuit for the In the same way, the operator may refund I a coin-,- by-operating "therefund*call key automatic switches.
  • yWlien the rel 1 stored, the" circuits shown return to' their" previous condition.
  • a 'c'onversation has proceeded "ffor a prede terininedf length of: time, for example, three minutes, she operates the 'fcoinmonpush'f button PB, Fig. 1, while the talking key and";
  • a trunk line including two talking conductors, a bridge across'said talking conductors, a relay energized responsive to current flow through said bridge, a second bridge, a condenser'connected in series withone talking conductor and directly shunted when said relay is normal, and contacts on said relay effective when the relay is operated to remove the shunt from around said condenser and to place said second bridge directly in multiple with the first.
  • a'trunk line including two talking, conductors, acondenser in series with one of said talking conductors, a bridge across said talking conductors on one side of said condenser, a relay in said bridge responsive'toticurrent fiow over said trunk line, a shunt'aroundsaid condenser controlled by saidirelay, a'second bridge across said trunk line in multiple with the first bridge when the relay iseoperated, and
  • a trunk line comprising two, talking conductors outgoing from a switchboard, a condenser inserted in one of saidtalking conductors, a shunt normally around'said condenser, a bridge across 011d bridge across sai'dtrunk line directly in multiple with the first bridge, inean'sfforplacing a bridge across the trunk line on the switchboard side of said condenser and for opening the first named bridge, means responsiveto the cessationbf current flow in the first named "bridge for 'shuting said condenser and forlremoving the second bridge from across the trunkline.
  • a telephone system a bridges arranged to be placedacross said trunk line, means for placing the first bridge across the trunk line,'means for preparing the second" bridge 'and ..for opening. the first bridge,mean s responsive to the opening of trunk line, two
  • a trunk line extending from a manual switchboard to an automatic switchboard, means for extending a connection to said trunk line at said manual switchboard and for placing a switch holding bridge across the trunk line, said bridge,
  • operator-controlled means for opening said holdmg bridge to permit the. operation of the mechanism at the automatic switchboard to I be controlled from the manual switchboard and for opening it subsequently to permit ringing current to be transmitted from the manual switchboard to the automatic switch board, a device at said'manual switchboard end of said trunk revertively controlled from ,the automatic switchboard after the automatic switching mechanism has been set and before the ringing current has been transmitted, and means controlled by said: device for rendering effective an, alternative holding circuit for the automatic switching mechanism when said bridge is opened to permit the passage of ringing current.
  • a trunk line ex tending from a manual switchboard to an au tomaticswitchboard, ringin'g-current-block ing condensers inserted in said trunk line, means controlled by the operator at said manual switchboard for shunting said condensers to permit the mechanism at the aui V tomatic switchboard to be controlled from the manual switchboard and for subsequently shunting?
  • the condensers topermit the pas- ;sage of ringing current, a holding bridge 9 across said trunk 11116 on the automatic switchboardside'ofsaid condensers, the said condenser shunting means being rendered cf- 7 festive upon a cessation of the'ocurrent fiowT in said holding bridge, an alternative'switch holding circuit path, and means revertivelycontrolled from the automatic switchboard.”
  • a link circuit at said manual switchboard comprising two sections, a calling device for controlling the operation of automaticswitohes, said calling device having anormal position, and meansresponsiveto the movement of said calling device from its normal position to effect the control of said switches for associatingsaid calling device with one section of said link circuit to'the exclusion oi the other and foricancelling such association upon the return of the calling device to normal.
  • an operators link circuit comprising two sections, a calling device for association with either section,op erator controlledrmeans for predeterminingwith which section the calling device shall be associated to the exclusion of theother and means eii'ective upon'the manipulation of said calling device bythe operator for carrying into effect the predetermined operation,
  • Atrunk line eXQ tending fromja manual switchboard, a bridge across said trunk line at the, manual switchboard including a polarized'fr elay and a nony i i tlr r a o 18.”
  • n1 atelephonesystenna trunk line eX- tending from a manual switchboard, a bridge across'said trunklineat the manual switch board including a polarized relay and a nonpolarized relay, a supervisory device, contacts on: each relay, and a circuit for said device including said contacts in series.
  • a separate timing device mon to allsaid timing devices,'means for associating said starting device'with any one of said timing devices, and means responsive to, I a subsequent operation of the starting device torstarting the associated timing device.
  • a talking key for each link circuit operable under the control'of the operator at the switch-board,'a starting device common to all-said timing devices, and means responsive to an operation of said starting for each link circuit, a starting device comdevice for starting the operation of the timdevice associated with any link circuit at which the talking key is operated.
  • a link circuit comprisin'g'two sections, a calling device normally connected to'both sections,means “forselectingeither section, and means automatically responsive to an 'operation'rof the polariz'edfrelay," a supervisory; device, and a n 95 7 Y Y circuit 'for said device controlled by said calling device for disconnecting the calling device from the other section.
  • a link'circuit comprising two sections, a calling device normally associated with both sections, means for selecting either section, and means automatically responsive to an operation of the calling device for disassociating the calling device from the other section.
  • a plurality of individual link circuits each comprising two sections, a common link circuit comprising two sections and containing a calling device arranged to exercise a control over switching apparatus by way of either section of any individual link circuit, means for connecting the sections of said common link circuit to the sections, respectively, of any individual link circuit and for selecting either section of the common link circuit, and means automatically responsive to anoperation of said calling device to exercise a control over switching apparatus by way of the selected section of the common link and the connected section of the individual link for disassociating said calling device from the other section of the common link and connected section oi the individual link.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
US221878A 1927-09-26 1927-09-26 Telephone system Expired - Lifetime US1771842A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE354512D BE354512A (nl) 1927-09-26
US221878A US1771842A (en) 1927-09-26 1927-09-26 Telephone system
GB27534/28A GB297747A (nl) 1927-09-26 1928-09-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US221878A US1771842A (en) 1927-09-26 1927-09-26 Telephone system

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US1771842A true US1771842A (en) 1930-07-29

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GB (1) GB297747A (nl)

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GB297747A (nl) 1929-12-27

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