US1494866A - Interoffice telephone system - Google Patents

Interoffice telephone system Download PDF

Info

Publication number
US1494866A
US1494866A US458318A US45831821A US1494866A US 1494866 A US1494866 A US 1494866A US 458318 A US458318 A US 458318A US 45831821 A US45831821 A US 45831821A US 1494866 A US1494866 A US 1494866A
Authority
US
United States
Prior art keywords
relay
circuit
armature
trunk
winding
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
US458318A
Inventor
Winfred T Powell
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.)
STROMBERG CARLSON TELEPHONE
STROMBERGCARLSON TELEPHONE MANUFACTURING Co
Original Assignee
STROMBERG CARLSON TELEPHONE
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 STROMBERG CARLSON TELEPHONE filed Critical STROMBERG CARLSON TELEPHONE
Priority to US458318A priority Critical patent/US1494866A/en
Application granted granted Critical
Publication of US1494866A publication Critical patent/US1494866A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Definitions

  • This invention relates to telephone systems and more particularly ⁇ the systeniseniploying automatic switches'to establish" some part of a telephone connection.
  • This instruction circuit commonly known as an order Vwire is employed to convey instructions between the operators las to thelines and trunks to be used iii the connection. As aresult of the use of this instruction or order wire,
  • VThe ypresent invention has for its .purpose the elimination of the mentioned instruction or order wire, aswell as to provide novel means for facilitatingvthe establishnient of a telephonerconnection. ⁇ These various features will appear from the following detailed descriptionaiid claiins:
  • selector switch of the two-motion type vvlilrl functions to first select a; group L 0f- ⁇ trunks'.
  • Fig.l Sfthere' is represented a register senderincluding .a vcontrol or.V
  • Figures 1 and 15, representA the ,trunk and. ⁇
  • switches employed in .this .systeni5- with. the exception of,.the trunk',selector switches mayA be, substantially gsiinilar, ,iii
  • the trunk selector switch may be similar to that disclosed in theY patent to Keith et al No. 815,321 patentedl March 13, 1906.
  • the various portions of the equipment of the system may be arranged in the follow-v indicating that the registers of the preselected 'sender are in readiness to'b-e ad' justed under control of the key-set, and a startkey for releasing the key-set from the operated register'sender.
  • V VA wipe-out key is also provided for each position to release vregisters that are inaccurately adjusted.
  • each group/or' which is assigned for.
  • a two-motion selector vswitch operating to seize the secondary trunk circuit indicated by a trunk finder switch.
  • the number of trunks and thel number of two-motion selector switches of course will depend upon the amount of traffic. switches and multipled to other similar switches at other operators positions is a secondary group of trunks leading to dietant oilices.
  • a plurality of register senders each comprising a group of relay registers and a rotary control switch or sender switch. These register senders are common to all the positions at the originating office and will be sutiicient4 in number to care for the maximum number of calls that are in process of completion at the same time.
  • a sender pre-selector switch is provided for the individual use of each operators position and runctions to preselect an idle register sender for its individual position ahead of the call. VIn order to associate an idle register sender with an idle secondary trunk circuit t0 the wanted oiice, a series of link circuits common to a plurality of operators are provided. Each of these link circuits terminates at one end in a trunk finder switch having multiple terminals of the Vvarious secondary trunk circuits and serving Vto select an idle secondary trunk circuit,
  • link linder switches are provided of which there To the terminals. of these two-motionY subscribers sub-station indicated 'at A to a wanted subscribers station indicated at B l/Vhen the calling Subscriber at A removes his receiver from its switchhook, the line relay 2 is operated in the wellknownv manner and actuates the line signal 3. The operator thereupon inserts the plug e into multiple jack 5 of theV calling line.
  • rlhis operation is eifective to actuate the cutoff relay 6 which functions to disconnect the line relay 2 from the calling line and to ex- Y tinguish the line signal 3.V
  • the operator thereupon depresses the listening key LK to connect her telephone set (not shownlto thecalling line and Vthereby receives the designation of 4the wanted line'from the calling subscriber. All of this takes place Vin the well-known manner.
  • Relay 9 on operation l closes alocking circuit for itself throughits ⁇ continuity spring and armature to ground.
  • the relay 13 when operated'also closes a locking "circuit for itself and an operatingcircuiting for relay 11 through its low resistance winding, this circuitbeingv traced Afrom ground, inner armature and 'front contact of relay 13, armature and back contact of the relay 10 low resistance vwinding of relay 13 through the contacts of the Wipe-out key und through the windings of relay 11 and motor magnet 15 to grounded battery.
  • Relay 11 is thus energized and-effects the operation of relay 59 lin a' circuit closed from grounded battery, its winding, lowermost armature and front contact of relay 11, uppermost back contact and armature of relay 12 to ground.
  • the lamp 60 is lighted in multiple with relay A59 to indicate that the operators key set has been connected to an idle register sender.
  • l Relay 11 also completes operating circuits'for relays 41 and 71 traceable from ground, winding of relay 41, inner ront'contactand armature orelay 11, brush94, conductor 95, vwinding of relay 71 to grounded battery.
  • Relay 71 when operated opens the release circuit of the sender switchV of Figure 3 ⁇ and connects the locking ground to conductor'70.
  • the motor magnet v17 advances the brushes of the link iinder switch until the test brush 19 engages the test terminal of an idle link circuit, which link circuit terminates at one end in a trunk .finder switch and at the other end in a sender iinder switch.
  • relay 20 As soon as the relay 20 actuates its arma tures it closes a-circuit from grounded battery through theresistance inner armature and front contact ofvrelay 20, back contact, armature and winding of the motor magnet 23, continuity spring and back contact of relay 24 to ground.
  • the motor magnetV 23 is actuated infthis circuit and advances the brushes ofy the trunk finderl switchuntil the test brush v25 engages a test terminal of an idle trunk, at which' time a circuitV is closed 'i to ground at'th'e armature and back contact ⁇ of relay 26, conductor 27 ,1 test brush 25, lefthand low resistance winding of the relay 24,.front contact ⁇ and armature of relay ⁇ 20 through the resistance to grounded'battery.
  • This circuit is eiective to short-circuit the motor magnet 23 and lto actuate the relay 24.
  • This last-named relay when operated closes a locking circuit ⁇ for itself from grounded battery,resistance, armature and front contact of relay 20, .back contact, arf ci mature and winding of the motormagnet 23, Vcontinuity springV armature and righthand high resistance winding of the relay 24, holding brush 28, upper winding of the marginal Arelay 29,- left-hand winding of' relay 26 through the back contact and armature to ground at some other relaysimilar to 26 associated with an idle trunk ⁇ r ⁇ leading to the Main'exchange.
  • the last-de -llil CII scribed circuit will extend through the wind-V ing of the group relay 21 which operates to remove the stopping ground from the terminals of all link finders assigned for use with trunks leading to the Main exchange. Since relay 29 is marginal it will not operate in the last described circuit but holds open the tip and ring conductors of the selected trunk to prevent interference with the impulse circuit including conductors 197 and 131.
  • the rela-y 24 at its inner left-hand armature and front' contacts applies ground over conductor 30 to the group terminal of the trunk selector switch to indicate the group ot trunks to be selected by this switch, 'whereas ground is applied over conductor 31 to indicate the trunk that is to be seized in this selected group.
  • a circuit is'closed from ⁇ grounded battery through the lamp ⁇ 32, inner armature and front contact of relay 18 through the brush ot the link finder, outer front contact and armature of relay 24 to ground.
  • Lamp 32 when lighted inlorms the operator that an idle; trunk circuit to the distant otlice, as well as an idle register sender have been selected, also at the outer armature and front contact of relay 24, a break-point is closed in the operating circuit ot the relay 14, but this circuit is still incomplete at the starting they.
  • the purpose ot this last-mentioned circuit will be described in the course of the following descriptions.
  • This circuit is effete to operate the relay 36 and introduce resistance in the circuit of the motor magnet 35 of thew sender finder to stop the same with its brushes in engagement with the terminals of the pre-selected sender.
  • the re lay 36 when Aoperated closes a locking circuit for itself from grounded battery resistance, lowermost armature and ⁇ front contact of relay 20, conductor 34, backcontact, armature and winding Yof the motor magnet indicate that the register sender of Fig. 3 Y
  • the trunk selector operates practically simultaneously with the trunk finder and sender finder, the operation of which has been previously described.
  • the mentioned operating circuit extends vtrom grounded battery, resistance, right hand armature and front contact of relay 9, continuity spring and back contact of relay 45, continuity spring and back contact of relay 46, armature, back contact and winding of the primary motor magnet 44, lower contact and'armature of relay 47 to ground.
  • the primary motor magnet advances the brushes of the trunk selector until the group brush 48 encounters the group terminal 49 ⁇ to which ground potential has been applied by the operation ot the trunk finder switch.
  • the primary magnet 44 is short-circuited by a circuit which may be traced from grounded battery resistance, armature andV front contact of relay 9, continuity spring and back contact of relay 45, continuity spring,back contact, lower winding ot relay 46, group brush 48, group terminal 49, trunk finder brush 50, inner front contactand armature of relay 24to ground.
  • This circuit is eiective to stop the operation ofthe primary motor magnet and also actuates the relay 46 which immediately closes a locking circuit for itself from ground through its upper high resistance winding, its inner armature and continuity spring, back contact and continuity spring of relay 45, front contact and armature of relay 9 resistance to grounded battery. With the relay 46 operated an actuating circuit is closed for the secondary motor magnet from ground, the winding,
  • This circuit is effective to advance the brushes of the trunk selector switch in its secondary movements to hunt for the pre-selected trunk circuit in the selected group or" trunks.
  • Va circuit is closed from ground ythrough the contacts of thislkey, conductor', ⁇ armature and front contact of relay 59, brush 63, conductor (35, armatureland contact y67 of relay (3G, lower ,Winding ofthe marginal yrelay 68, Winding of relfayvGQ to grounded Abattery to operate relay 69.
  • Relay k68 isoactuated in this lcircuit and completes a locking circuit for itselrP ⁇ from grounded batter Y, its up-V per Winding front contact Yand armature, front contact and armatureV of relay 71.toy
  • relay j 4e The operator non7 depresses numerallrey ,No.5 and extends .the circuit from groundthrough thecontacts .of No. 5 key, armature and front Contact of relayv 59, brush 64, conductor84, armature and contacts S5 of relay75, lower winding of sensitive relay 80 lower Winding of marginal relay-87, Winding of relay 69. to grounded battery.
  • the sensitive relay 80 and Vthe relay 69 are energized, together with relay 87.
  • Relays 80 and 87 on operation are locked in this condition over conductor 70 to the locking ground.
  • Switching relay deenergizes and relay 76 is operated in a manner similar to the operation of relay 73.
  • Relay 14 is operated in this circuit and opens the operating circuit of the relay 11 which permits the sender pre-selector to be advanced to select an idle sender.
  • relay 12 is now operated in a circuit traceable from grounded battery, its'winding, lower back cont-act and armature oi'i relay 11, test brush 94 of the sender pre-selector, conductor 95 and front contact and armature to ground, of relays similar to 4 3 at engaged register senders. While relay 12 is held operated, motor ymagnet 15 is actuated in a circuit extending through its winding, back contact and armature, the inner 'front con- ⁇ tact and armature o1z relay 12, lowermost sistance to grounded'battery.
  • relay 92 when operated, extends the impulse circuit 'from the register sender to the conductors or' the selected trunk.
  • relay 13 is locked in series with relay 11 and when relay 14 opens the circuit of relay 11 it eiects the deenergization of the relayv 13 lwhereupon the locking circuit including righthand winding of relay 18 is opened and this relay retracts its armatures.
  • the link finder is of that type which remains in engagement with the trunk last used so that this last described operation is all that is necessary to effect it release.
  • the link circuit in use is, however, guarded by the energization of relay 20, circuit of which extends from ground, itswinding, lett-hand front contact and armature of relay 93, resistance to grounded battery.
  • the relay 97 of Figure 2 is energized from grounded battery, its winding, through the upper winding of the repeating coil, back contact andL uppermost armature of relay 96, conductor 118 of the trunk, conductor 197 through the brush of the trunk linder, c'onductor 98, inner front contact and armature of relay92, sender nder brush 121, conduc-V tor 99, register controller brush 100 in its norinalposition, conductor 101, winding of relay 102 to ground.
  • Relays 97 and 102 are both energized in these circuits, the operation of relay 102 closes a circuit from ground, its armature and front contact, controller bi'iish 103 in its normal position, back contact, armature and winding ot the motor magnet 104 to grounded battery.
  • the motor magnet thus causes the advance of the controller brushes into their zero position.
  • Relay 204 is thus actuated and connects the lamp 105 in series with a'iiasher 106. Lamp 105 is thereby intermittently lighted to call the cperators attention to the fact lthat a call is awaiting attention on the trunk to which this lamp is individual.
  • Relay 96 is also energized in this circuit and closes a locking circuit for itself from grounded battery, contacts of release key 111, conductor 112, winding of relay'113,
  • Relay 124 is operated in this circuit and is locked actuatedover conductor 125, front contact of relay 113 through the resistance to grounded battery. Also with the sender and receiver switches in position 1, relay 126 (Fig. 3) is operated in a circuit traceable. ⁇
  • relay 133 troni grounded' battery through both wind'- ings in series of this relay, sender brush 127 in its first posit-ion, conductor 123, brush 129.
  • relay 126.,.thc motor magnet 104 of the sender switch has an operating circuit closed from' grounded battery, winding of this magnet, its armature and back contact, sender brush 103 in position 1, front contact and armature of relay 126 to ground.
  • aeircuit In position 2 aeircuit is closed'from grounded bat ⁇ tery, low resistance winding ofrelay 126, brush127 in its-'second position, conductor V128, brush 129, armature and front contact of relay 92, conductors 130, 131 and 119, inner armature and front contact of relay 96, conductor 117, brush 132 in its second position through both the highf resistance and low resistance windings in series of relay 133 to ground.
  • Relay '126 will'notremain operated in series with both windings of relay 133 AandY deenergizes to complete va circuit from ground, its armaturef'and backA Contact, brush 103 in itsv vsecond ⁇ position, Iback contact,arinature and winding of the motor magnet 104 to grounded K battery.
  • the brushes of the sender switch are advanced into posi; tion 3.
  • the circuit of relay 133 is opened and it deenergizes' to vadvance the receiver switch into position 3. x Vith the sender and receiver switches both in position 3, the relay i.
  • relay 131 is actuated and'thereby closes a.
  • relays 126, 133", 181' and' 180V From the foregoing described operation of relays 126, 133", 181' and' 180V it will be noted lthat first 'one of the relays of these pairs is operated and subsequently the other relay of the' saine pair is operated to ⁇ ad-jk Vance the receiver switchinto a succeeding position.' It will thus beseen that'the sender- 'switch is rst advanced oneY step to complete a circuit for advancing the receiver switch a single step and this operation completes a circuit for' advancing the'seii'der switch into.
  • the registration stored up on the tens register is transmitted to the distant oice over conductor 141 and the tip side of the signalling circuit previously described, brush 122 ofthe receiver switch, conductor 142,v winding of relay 144 to groundedbattery.
  • Relay 144 is thus energized and is locked operated to ground over conductor 154.
  • the registration stored up on the units register is transmitted to the distant oliice over conductors 145 and 146 while the sender and receiver switches arev passing throughV positions17 and 18, and these mentioned conductors are included in circuits for actuating relays 147 and 149 at the distant office.
  • relay 29 extends from grounded battery through the resistance armature and front contact of relay 96, brush 28, upper winding of relay 29, left-hand winding of relay 26 to ground at the armature and back contact of a relay similar to 26 associated with an idle trunk or if all of the trunks are busy, through the winding of relay 21 to ground.
  • Relay 151 is joperated When the brush, '159 of Lth'edistributo-r is 4advanced l'to 'position 4 where- 'a circ-uit is completedfoverconductor to the Afrontvcontact and armature -rof "actuated hundreds relayl 143, to ⁇ L fgr'o'unded battery over conductor 125.
  • vcontact xand.a 1rna'ture of relay 2021, Windof Athejtri-p -relay 170,:lower1nost front Contact afndarrhatuiie of; the ringing relay ⁇ 17 1, uring,conductfo f ⁇ rl of .the .eord, ring centac'ts of ,the ,plug w164v and 'jack 165,.
  • Talking battery is suppliedvto the called party through the ⁇ windingsof supervisory relay 172 and when the called party responds, this relay is actuated to complete a circuit for relay 173 in series withthe supervisory relay 1740ic the cord circuit at the originating oice.
  • relay 173 is o perated in series with the relay-174 of the cord circuit at the originating oice, while to give supervision to the terminating operator, the tip side of the circuit is connected through the.r windings of relays 17 5 and 97.
  • K Talking battery is lsupplied to the calling partythrough the left-handwindings of the repeating coil in the-A operators cord circuit.
  • a supervisory relay such as 17 9 is released in the operatoids cord circuit at the ture of relay 116, winding .of the pilot relayv to ground.
  • the relay 172 decnergizes and opens the circuit including relays 1.73. and 174.
  • Relay 174 will then deenergize to light a disconnect lamp not shownll at the A operators position. This operator. will then proceed to remove the plugs 4.and 7 ofthe jacks 5 .and 8.
  • the descriptio-n may therefore be taken up at the point where the thousands relay 138 and the Il@ f hundreds relay 143, tens relay 144, the units relays 1 47 and 149, and the stations relay 124 have been' lockedactuated. It will also be assumed that the receiver switch has been advanced to position 217 in which position acircuit is completed over conductor 155 to actuate the relay 156, As in the previous case this effects the operation of the motor magnet 157 which advances the vbrushes of the small distributor switch in the same manner as in the first. described circuits.
  • Wheil vthe,.hetrlb brush 200 isA Y21 lv2f1 ⁇ 11ccl fofpotti he switching .rely'QOQiS ooerate vi 1 ⁇ 1'zrl'e closed to ground throughfhfebrshQOOf when the ,distributor Aswitch tion ll,v relay Q'Orh's an oier llt closed ,from,.groun'd, its .right-hemd yvlndgng, front Contact 4and 'arnit'resjo'f "rel brs'h 1597 conductorf140 ⁇ ,r frofri't oarmature of: relziy 143l to he tery yover oohcllto'r 125,.l Rel opertecl isflooke n thifs'oondl its left-hand frot polgatfs'd ground -ltgtheffroIlt-o
  • info al meipl'e raf@ positions a terminating oflice having a B operators position, telephone lines terminating in each operators position, trunk circuits terminating at said A operators positions, means for connectingtsaid" trunk circuits to said B operators position, a cord circuit'at cachot1 said A operators7 positions 'for connecting a calling line to a trunk circuit, a plurality otregister senders' commonto said A operators positions, means responsive to the connection of a cord circuit tov atrunk circuit for seizing a register sender for use, means for.
  • a single set of tennumerical keys at said A operators position for adjusting said sender a receiver at said B operators position comprising receiving mechanism for each digit of the-wanted number,vsaid receiver being adjusted from said senderlampsassociated therewith less in number thanthe number of said mechanisms andmeans for connecting said Vtrunk circuit-to a wanted telephone line as indicated.
  • n Y n l y 6 In a telephoneV system, an A operators position, a B operators position, a trunk circuit for connecting said positions, telephonerlines terminating in each position,
  • f vmeans for connecting a calling telephone incassa line at said A o erators osition'to said atrunk circuit, av variably operable sending device connectible to said trunk circuit, a receiving deviceV atsaid B operators position comprising a set of receiving mechanisms, one for each digit of the wanted number, said mechansms being arranged to be variably operated under the control of said sender, a'single set ofkeys at the A operators positionv for controlling the operation offs'aid sender, means for locking the mechanisms in their actuated condition, a singleV Vset ,of indicating lamps arranged to beY opsition arranged to be variably adjusted in accordance with the designation of the wanted ⁇ line, means for connecting said senderto f said trunk, a group of receiving.
  • relays at said B operators position arranged to be variably operated under the control of said sender over said. trunk, aysetofhindicating lamps repeatedly operated under the control of two di'erent groups of relays, and means 'for-connecting said trunk circuit to a wantedA line as indicated.
  • n 9- In a, telephone System,.an originating office,l a distant office, a pluralityv of l opera? ⁇ tors positionsatl each of said offices, tel'e phone lines terminating at eacliuof said of# ices,I trunk-circuitsifor connectingfsaid offices, certain of which terminateatfthe originatingy oiiiceI in jacks, operators ⁇ cord circuits at the originating o'iiicetor connetinga calling line through ay jack to a1 trfunl ⁇ leading ⁇ to said: distant v'otlic ⁇ e,l a key-set atl each operators p osition, a plurality'iof register senders common to a plurality,- o'i po-iY sitions atsaid originatingoliice, means.. re-Y sponsive to the connection, of aj calling line toa trunk for associating.
  • a receiver'fat ofc'ftlie said'B o erjatorsgposition comprisingja receirnamaliaam.- for. eahsdigiffofthe Wa.nted"number, 'sa-id Vreceiver'y being adjusted under the control of said sender, one or more sets of lamps associated With said receiver switch less in number than the number of said mechanisms, a progressively movable switch for connecting said sets of lamps to said mechanisms in succession, and means for connecting said trunk circuit to a Wanted telephone line.
  • an originating olice having an A operators position, ,a terminating office having a B operators position, telephone-lines terminating at each operators position, a primary trunk circuit terminating at said A operators position, a plurality of secondary trunks terminat-ing at said B operators position, an automatic switch for extending said primary trunk to a selected secondary trunlna plurality of register senders at said A- operators position, a linlr circuit terminating at each end in a progressively movable switch for connecting an idle register sender to a secondary trunk, means responsive to the connection of said link circuit to said secondary trunk for causing said automatic switch to extend the primary trunk tothe position, a B operators position-,telephone linesterminating in each of said positlons, aV primary trunk terminating in said A; operators position, manual means for connect ⁇ V ing a calling telephone line at anA operators position to said primary trunk, a plurality of secondaryy .trunks extending to said B operators position, a plurality' of register send
  • an originating ofice a distant office, telephone lines terminating at each of said oiices, trunk circuitsY interconnecting said oiices, means at the originatmg omce for connecting a calling telephone line through a trunk to said distantolfice, a sender at the originating oiice variably operable in accordance with the designation of the Wanted telephone line,

Description

.MMDL mm on lNvENToR WWU- RED T. POWELL.
5 sheets-smet 1 BY p9 W. T POWELL INTEROFFICE TELEPHONE SYSTSEM'` Filed April 4,
May 20 11924.
May. 2o, 1924.
' w. vr. POWELL. IN'EaoFFIcE TELEPHONE lSYSTEM Filed Aprn 4, 152x lNvENoR wmFREpT POWELL BY Q gg'amw` ATTORNEY May 2o, 1924 I 1,494,866
W. T. POWELL n leq April 4 1921 5 sheets-sheet 4 ATTORNEY May 20, 1924. 1,494,866
W. T. POWELL I NTEROFFICE TELEPHONE SYSLI'EM Filed April 4. 1921 s sheets-sheet 5 INVENTOR N y WIHF'REDTPOWELL ATTORNEY FIGS Patented May 20, 1%24.
Wiiiirnnn fr. POWELL, orsoorinsrnaivnw Yoan,i-irssrenonnro'rI-in sTRoi/JL'BERG CARLSON TELEPHONE MANUiii-ecruBrive contrasti?, or ROCHESTER, NEW YORK, A'
CORPORATION OF IIEVJV YORK.
nrnnorrrcn VTELErHoNpE' sYs'rr/iiir'.
Appiicatikin4 fried April '4, 192i." yse'iia'i ini.` 453318.
To kfaZZ whom #may 0on0ern:.
Be it known that I, VINFRED T,y POWELL,
a citizen of the United` States, residing at.
Rochester, iii the county of Monroe and State of New York, have invented.certain` new and useful Tinproveinents inlnteroiiiceV Telephone Systeni's,of which the following.
' is a full, clear, concise, and exact description. l z
This invention relates to telephone systems and more particularly` the systeniseniploying automatic switches'to establish" some part of a telephone connection. Y
Iny inter-office telephone systems, it. has
formerly been necessary to provide an ,in-
struction circuit between operators at the 1 Y. this figure. and vfunctions vto pre-select-` .an
exchanges through which, a telephone'connection is to be extended.V This instruction circuit commonly known as an order Vwire is employed to convey instructions between the operators las to thelines and trunks to be used iii the connection. As aresult of the use of this instruction or order wire,
the service is rendered less vrapid by reasonA of the fact that the wanted number must be repeated to the operator at the exchange where the wanted line terminates, and this operation, in addition to the slowing vdown of the service, is a source of numerouser-r -rors due to the fact that the numbers are notrepeated distinctly., Y Y
VThe ypresent invention has for its .purpose the elimination of the mentioned instruction or order wire, aswell as to provide novel means for facilitatingvthe establishnient of a telephonerconnection. `These various features will appear from the following detailed descriptionaiid claiins:
The drawings with Figures l and v2 arranged in the order named, and `with Fig.- ure placed below Figure l, diagrammatically, represent a portion. of a telephone systeni employing ,the present invention. At
the upper left-hand corner of Figure l there," is represented the line and sub-station `cir-V cuits of a subscriber and multiple jack of this line. There is also represented an abbreviated cord circuit terminating at each end in a well-known connecting plug.. ThisI cord circuit may be of any well known type employed forv extending inter-oliice ltele-V phone connections. Iii this figure there also appears .the oper-ating Icircuits l of av .y
selector switch of the two-motion type vvlilrl functions to first select a; group L 0f- `trunks'.
selectsan `,idle r,trunk iiithefs'electedi group.:
A trunk finder'switchlocating the *trunk*Y to be. seized f by the.l trunk selector..V and a senderlinder for selecting@ pre-selected ,reg-A" idle sender foruse ahead ofthe calls. .These various switches 5and the. operating: circuits.
for the saine areeiic'lo'sed .by `Olottedqlinesi` and` by the confines `,ofthe drawing. the lower; left-hand .portion ,of Fig. '1.,t-heife appears a single stiiplof ten, numerical keys.i
whichfisconinion toa single positio'nr'iif; the
switchboard. In Fig.l Sfthere' is represented a register senderincluding .a vcontrol or.V
sender switch individual to;` this sender. '.It will be understood. that the arrangements',V
appearingv in Figs;v l and' .3 arelocated in the saine oiiice.. "In Figure A2ftliere. isfdiagraininatically 4showna portioiilof the trunk circuit at the second or distant,QOice,and.,
the controlling Y. circuits'` for'lr the l, saine. V{Tn this ligure, there also appear" group`s` of.y rye-.Y
A 4lays. for receivingfthe designation from the vregisters of; the originating officel andareceiver switch forco-.operatingin the trans-1 fer ofthisdesignation tothe groups of receiving relays.
Figures 1 and 15,:representA the ,trunk and.`
controlling.,.circuits associated therewith atk the distantoiiice as well as the modifiedtre.-
ceiving registers `and rlainp indicatinggdee.
vices associatedtherewith. `Itwill be un: derstood that the .circuitsof Figures 4 ,and
5 may besubstituted for, those ofdigure 2,;
in which casel` the circuits Y. lof, Tiigures. if and'.
5 operate .with thoseinFigures 1.andi3.. The switchesemployed in .this .systeni5- with. the exception of,.the trunk',selector switches mayA be, substantially gsiinilar, ,iii
structureto those disclosed in thepatent to 55 leading to the wanted oflicef,andthereupon Clement No. 1,107,153'patented'August 11, 1914. The trunk selector switch may be similar to that disclosed in theY patent to Keith et al No. 815,321 patentedl March 13, 1906.
The various portions of the equipment of the system may be arranged in the follow-v indicating that the registers of the preselected 'sender are in readiness to'b-e ad' justed under control of the key-set, and a startkey for releasing the key-set from the operated register'sender.V VA wipe-out key is also provided for each position to release vregisters that are inaccurately adjusted.
Before each operator there are placed groups of multiple trunk jacks connected to trunks, each group/or' which is assigned for.
calls destined to a particular exchange or ofce. These multiple trunk )acks are connected to primary trunks each of which ter.
minates at its other end in a two-motion selector vswitch operating to seize the secondary trunk circuit indicated by a trunk finder switch. The number of trunks and thel number of two-motion selector switches of course will depend upon the amount of traffic. switches and multipled to other similar switches at other operators positions is a secondary group of trunks leading to dietant oilices. In this system there are provided a plurality of register senders each comprising a group of relay registers and a rotary control switch or sender switch. These register senders are common to all the positions at the originating office and will be sutiicient4 in number to care for the maximum number of calls that are in process of completion at the same time. A sender pre-selector switch is provided for the individual use of each operators position and runctions to preselect an idle register sender for its individual position ahead of the call. VIn order to associate an idle register sender with an idle secondary trunk circuit t0 the wanted oiice, a series of link circuits common to a plurality of operators are provided. Each of these link circuits terminates at one end in a trunk finder switch having multiple terminals of the Vvarious secondary trunk circuits and serving Vto select an idle secondary trunk circuit,
and at its other end in a sender finder switch ,functioning to locate a pre-selected register sender. In order to select one of these link circuits and to start a trunk finder and a sender finder switch into operation, link linder switches are provided of which there To the terminals. of these two-motionY subscribers sub-station indicated 'at A to a wanted subscribers station indicated at B l/Vhen the calling Subscriber at A removes his receiver from its switchhook, the line relay 2 is operated in the wellknownv manner and actuates the line signal 3. The operator thereupon inserts the plug e into multiple jack 5 of theV calling line. rlhis operation is eifective to actuate the cutoff relay 6 which functions to disconnect the line relay 2 from the calling line and to ex- Y tinguish the line signal 3.V The operator thereupon depresses the listening key LK to connect her telephone set (not shownlto thecalling line and Vthereby receives the designation of 4the wanted line'from the calling subscriber. All of this takes place Vin the well-known manner.
Let it be assumed that the designation of the wanted line is Main 2345-J The operator then inserts the calling'plug 7 into any one of a group of jacks, such as 8 assigned to the exclusive use of calls completed through the Main exchange. As soon as this operation is complete, a circuit is closed from grounded battery through the sleeve of plug 7 and sleeve of jack 8, winding of the marginal relay 9, its armature and back contact, winding of the slowereleasing relay 10, conductor 16, lower back contact and armature of relay 11, uppermost back contact and armature'of relay 12 to ground.
cuit, but the relay 10 is operated to fclose other circuits which will be described. One
` of these circuits extends from ground, front contact and armature of relay 10, lower liigh-resistance winding off the relay 13, the normally-closed contacts of the wipe-out key, continuity spring and back contact ofv the slow-releasing relay 14, winding of the marginal relay 11, armature, back contact and winding of the motor magnet 15 to` ll() l ldarginal relayv 9 is not actuated .in this cir"V erated in a circuit traceable from'grounded battery, resistance through the sleeves of the plug 7 andy jack 8,Winding ,of relay 9, its Continuity spring and back contact, uppermost armature and front contact of relay 13, conductor 16, lowermost Vback contact and armature of relay 11, uppermost'back contact and yarmature of relay 12 to ground. Relay 9 on operation lcloses alocking circuit for itself throughits `continuity spring and armature to ground. The relay 13 when operated'also closes a locking "circuit for itself and an operatingcircuiting for relay 11 through its low resistance winding, this circuitbeingv traced Afrom ground, inner armature and 'front contact of relay 13, armature and back contact of the relay 10 low resistance vwinding of relay 13 through the contacts of the Wipe-out key und through the windings of relay 11 and motor magnet 15 to grounded battery.V
Relay 11 is thus energized and-effects the operation of relay 59 lin a' circuit closed from grounded battery, its winding, lowermost armature and front contact of relay 11, uppermost back contact and armature of relay 12 to ground. The lamp 60 is lighted in multiple with relay A59 to indicate that the operators key set has been connected to an idle register sender.l Relay 11 also completes operating circuits'for relays 41 and 71 traceable from ground, winding of relay 41, inner ront'contactand armature orelay 11, brush94, conductor 95, vwinding of relay 71 to grounded battery. Relay 71 when operated opens the release circuit of the sender switchV of Figure 3 `and connects the locking ground to conductor'70. With the locking ground connected to conductor an operating circuit 'is closed for the thousands switching relay 66, completed from grounded'battery, right-hand winding of this relay, middle armatures and back contacts of relays 73, 74, and 76 back contact and armature of relay 77 to ground over conductor 70. The switching relay when thus operated connects the opera-tors key set to the thousands relay register. Also when the relay 13 is operated, it'closes a circuit from grounded battery, resistance, lower armature and front contact' of relay 13, armature, back contact and winding Yoi? ,the motor magnet 17, continuity spring and back contact of relay 18 to ground. Under the control of this circuitthe motor magnet v17 advances the brushes of the link iinder switch until the test brush 19 engages the test terminal of an idle link circuit, which link circuit terminates at one end in a trunk .finder switch and at the other end in a sender iinder switch. vAs soon' as the idle link is located, a circuit is closed for short-circuiting motorinagnet 17 and thereby stopping the link inder switch, this eircuit being completed 'from groundedbat- Adered busy.
tery, resistance, `armature and -front contact of relay 13,lefthand Winding of relay 18, p test brush 19,v back contact and armature of.
winding of the motor magnet 17, continuity spring, armature and 'right hand winding of relay 18, holding brush 22, winding of the slow-releasingrelay 20: to ground; Relay 18 is maintained operated inthis circuit,` but themotor magnet 17 is not actuated inl series with the high resistance winding of the relay 18. Therelay 20 at its upper armature removes the stopping ground potential-from all thetest terminals of this .link at other link finder switches' so that -it will be ren- The'operation of the relay 20 lcompletes circuits 'for' setting the trunk finder switch and the sender finderswitch oi the selected link circuit into operation. rIhe actuation of the iirst :of theser mentioned switches vwill now be described.
Y As soon as the relay 20 actuates its arma tures it closes a-circuit from grounded battery through theresistance inner armature and front contact ofvrelay 20, back contact, armature and winding of the motor magnet 23, continuity spring and back contact of relay 24 to ground. The motor magnetV 23 is actuated infthis circuit and advances the brushes ofy the trunk finderl switchuntil the test brush v25 engages a test terminal of an idle trunk, at which' time a circuitV is closed 'i to ground at'th'e armature and back contact` of relay 26, conductor 27 ,1 test brush 25, lefthand low resistance winding of the relay 24,.front contact `and armature of relay`20 through the resistance to grounded'battery. This circuit is eiective to short-circuit the motor magnet 23 and lto actuate the relay 24. This last-named relay when operated closes a locking circuit `for itself from grounded battery,resistance, armature and front contact of relay 20, .back contact, arf ci mature and winding of the motormagnet 23, Vcontinuity springV armature and righthand high resistance winding of the relay 24, holding brush 28, upper winding of the marginal Arelay 29,- left-hand winding of' relay 26 through the back contact and armature to ground at some other relaysimilar to 26 associated with an idle trunk `r`leading to the Main'exchange. As 'soon as all the relays similar to26 are actuated the last-de -llil CII scribed circuit will extend through the wind-V ing of the group relay 21 which operates to remove the stopping ground from the terminals of all link finders assigned for use with trunks leading to the Main exchange. Since relay 29 is marginal it will not operate in the last described circuit but holds open the tip and ring conductors of the selected trunk to prevent interference with the impulse circuit including conductors 197 and 131. The rela-y 24 at its inner left-hand armature and front' contacts applies ground over conductor 30 to the group terminal of the trunk selector switch to indicate the group ot trunks to be selected by this switch, 'whereas ground is applied over conductor 31 to indicate the trunk that is to be seized in this selected group. At the outer lefthand armature ot relay 24 a circuit is'closed from `grounded battery through the lamp` 32, inner armature and front contact of relay 18 through the brush ot the link finder, outer front contact and armature of relay 24 to ground. Lamp 32 when lighted inlorms the operator that an idle; trunk circuit to the distant otlice, as well as an idle register sender have been selected, also at the outer armature and front contact of relay 24, a break-point is closed in the operating circuit ot the relay 14, but this circuit is still incomplete at the starting they. The purpose ot this last-mentioned circuit will be described in the course of the following descriptions.
The operation ot the sender finder vswitch will now be described: It will ot course be understood that the sender iinder and the trunk finder switches operate simultaneously, the sender iinder switch being operated by the closure or" the circuit trom grounded battery through the resistance',
lowerinost armature and front contact of relay 20, conductor 34, back contact, armature andv kwinding of the motor magnet 85, continuity spring andback contact of relay 36 to ground. The sender'iinder switch advances its brushes until its Vtesty brush 38 encounters a test terniinalof the pre-selected sender, at which time a circuit is closed from grounded battery resistance, lowerinost' ar mature and .Front contact of relay 29, lefthand low resistance, winding ot relay 36, test brush 38,. conductor 39,'sender pre-selector brush 40, armature and front contact ot relay 41 to ground. This circuit is efective to operate the relay 36 and introduce resistance in the circuit of the motor magnet 35 of thew sender finder to stop the same with its brushes in engagement with the terminals of the pre-selected sender. The re lay 36 when Aoperated closes a locking circuit for itself from grounded battery resistance, lowermost armature and `front contact of relay 20, conductor 34, backcontact, armature and winding Yof the motor magnet indicate that the register sender of Fig. 3 Y
is busy. f
As soon as the marginal relay 9 is operated it closes an operating circuit for advancing the trunk selector switch. Here it should be noted that the trunk selector operates practically simultaneously with the trunk finder and sender finder, the operation of which has been previously described. The mentioned operating circuit extends vtrom grounded battery, resistance, right hand armature and front contact of relay 9, continuity spring and back contact of relay 45, continuity spring and back contact of relay 46, armature, back contact and winding of the primary motor magnet 44, lower contact and'armature of relay 47 to ground. Under the control of this circuit the primary motor magnet advances the brushes of the trunk selector until the group brush 48 encounters the group terminal 49` to which ground potential has been applied by the operation ot the trunk finder switch.. As soon as this terminal is located the primary magnet 44 is short-circuited by a circuit which may be traced from grounded battery resistance, armature andV front contact of relay 9, continuity spring and back contact of relay 45, continuity spring,back contact, lower winding ot relay 46, group brush 48, group terminal 49, trunk finder brush 50, inner front contactand armature of relay 24to ground. This circuit is eiective to stop the operation ofthe primary motor magnet and also actuates the relay 46 which immediately closes a locking circuit for itself from ground through its upper high resistance winding, its inner armature and continuity spring, back contact and continuity spring of relay 45, front contact and armature of relay 9 resistance to grounded battery. With the relay 46 operated an actuating circuit is closed for the secondary motor magnet from ground, the winding,
armature and back contact of this magnet, innermost armature and continuity spring of relay 46, back contact and continuity spring of relay 45, front contact and armature ot relay 9 through the resistance to grounded battery. This circuit is effective to advance the brushes of the trunk selector switch in its secondary movements to hunt for the pre-selected trunk circuit in the selected group or" trunks. As soon asthe preselected truiik is located, a circuit is closed from grounded battery, resistance armature and front contact of relay 9, continuity spring and contact of relay 45, uppermost tront contact and armature of relay 46, low resistance winding of relay 45, test brush iso Maase@ .52 of the trunliselector, .conductor 81, :front contact and armature of relay24 to ground. The secondary motor magnet vis shunted, but the relai/,45 is actuated and closes a locking circuit for itself trom grounded battery, resistance, 7armature andtront contact ot relay 9, continuity spring, .armature Aand high resist ance Winding of relay `45, holding brush .53
of the trunk selector, conductor 54, lower the trunk. selector until-the group brush ,48-
encounters the overflow terminal -57 to close an operating circuitlfor the relay 447. v:This ejects .thei-ellevase .of the trunk .selector switch by reason of 2a circuitclosed from grounded battery, `.resista-nce, armature vand Viront `contact ot relay .9, .upper Winding, front contact .and .armature .of relay ...47 .winch-nger thereleaseimagnet 5.8 .andonormal contacts to ground. -This will release thetrunksele'ctor switch andit .Will immediately.V repeat. lthe operation. of. hunting for the preselected group of trunks and as soon asfthisI group ottrunks islocated the primary operation of the trunk selector switch Will. be stopped in the-manner already described. y
Assoon .asthe relay 59,is,operate d,the operatorsset .of keys ,is .connected Vto the brushes 61, .6263and 64othe sender2 preselector l.and ysince vthis .pre-,selector is Vassumed to be standing with .its l brushes in engagement with the yterminals of `an idle sender the operators -key 4 setjis thus ,con- Ynected `to `an idle register sender. It has Vbeen assumed ,earlier in the. description that thev designation-of the Wanted Lline lsMain 2345TJ. The operation of plugging intto a connecting jaclrassigned tothe Main o'ice con'llpletes the irst 1part ot the selection. It y theretore remains orthe, operator tot set up theremainder-.of thedesignation 2345.-:J which is done by pressing lthe .respective keysin the order named.A
YWhen the operator presses key N o. 2, Va circuit is closed from ground ythrough the contacts of thislkey, conductor', `armature and front contact of relay 59, brush 63, conductor (35, armatureland contact y67 of relay (3G, lower ,Winding ofthe marginal yrelay 68, Winding of relfayvGQ to grounded Abattery to operate relay 69. Relay k68 isoactuated in this lcircuit and completes a locking circuit for itselrP `from grounded batter Y, its up-V per Winding front contact Yand armature, front contact and armatureV of relay 71.toy
. battery.
ground. The operation loit-relay ractuates relay 72. lVhen, howeyenthe No. 2ykey is released-relay4 69 deenergizesand retracts its armature, but an operating circuit; lsclosed tromgrourrd, its continuity spring and back'. contact, lrlp-geht-hand Winding of relay 72,1135 .inner A-front -contact and armature, outer armatureland front ,conta-ct of relay 66,v righthand Winding of `relay 7 3 toI grounded "The Arelay y73 is actuated in this circuit and is locked operated, first a circuit from grounded ibattery, its leftyhand winding, linner Vfront contact Vand armature, `outer armature and front Contact o t vrelay 72-to ground.' A second, ylocking circuit for relay 7 3 extends from grounded battery, righthand Winding .of
this relay, its middle front contact `and-.ar-
mature through the middle back contacts 4.and armaturesotrela s 74 7 5 and 476 back.
.con,tact. and armature of relay 77, conductor 70 to the Aholding ground. The operation ljustdescribed is etfective to selectively actuate the thousandsrelay register and \has .extended the control or' the opcrators they-` lset to `thefhu-ndreds relay register. A The `0perator.nowfdepresseszkey No. 3 and thereby completes `a circuit from ground through the resistance, contacts of the No. 3 key, armaturevand front Contact oi relay 59, brush 62, armature and front contact 7 9 of `relay v73, lower Winding of sensitive relay'BO, lower Winding ofthe marginal relay'81,Winding otrelay 69 tov grounded battery. The relays 8O .and rG9 .are actuated in Ethis circuit, vbut marginalzrelay 81 remains inert. 'Relay -80 lon operation closes ;a 4locking circuit for it- .self ,from grounded lbatt`ery,its :front coir ltact and armature tofground vover conductor 70. The relayvGS whenoperated again, ac-
tuates 7 2te effect the deenergization .of 'the switchingrelay 73 and Ithe actuation ofthev tens switching relay 7,4 in the manner just described for. therelays Itiand 7 3. Thatens register new in .readiness'nto be loperated and-the opera-tor depresses No. 4 keypotfher key-set to closea circuit roinfground, contact-sof the No. 4 key, armature and'tront` contact o-frelay 59, Ibrush, 61, armature and contact 82 otrela'y74, lower vWindingot Athe marginal relay v83, Winding otrelay 69v to ingrelayV 742the'n -deenergizes and vthe units grounded battery. Relay 83 when Voperated lislocked operated` over a circuit including conductor 70fto the locking ground. Switchv.
manner =as has been `described 'iin connection .l
with. relay j 4e. The operator non7 depresses numerallrey ,No.5 and extends .the circuit from groundthrough thecontacts .of No. 5 key, armature and front Contact of relayv 59, brush 64, conductor84, armature and contacts S5 of relay75, lower winding of sensitive relay 80 lower Winding of marginal relay-87, Winding of relay 69. to grounded battery. Here also the sensitive relay 80 and Vthe relay 69 are energized, together with relay 87. Relays 80 and 87 on operation are locked in this condition over conductor 70 to the locking ground. Switching relay deenergizes and relay 76 is operated in a manner similar to the operation of relay 73. The operator now depresses the party key J which extends a circuit from ground, resistance, contacts of key J, armature and front contact of relay 59, brush 64, conductor 84, armature and contact 89 ot relay 76, lower winding of relays 90 and 91 and winding of relay 69 to grounded battery. Relays 90 and 69 are actuated in this circuit, the former of these relays being held operated over conductor 70 to the locking ground. Relay 69 etects the'operation of relay 72 to control in turn the actuation of the relay 77 which is locked operated over the locking ground conductor to remove thisf register sender from the further control of the operators key-set. The relays of the register sender remain in this actuated condition until the operator at the distant olioe has signified that she is in readiness to receive the indication of the wanted party.
The operator after setting up the wanted number depresses the start key and completes a circuit from grounded battery, resistance, upper contact of the start key, winding ot the relay 14, outer armature and front contact of relay 18, brush 33, righthand winding of relay 93, outer front contact and armature of relay 24 to ground. Relay 14 is operated in this circuit and opens the operating circuit of the relay 11 which permits the sender pre-selector to be advanced to select an idle sender. This is et fected by reason Vof the fact that the relay 12 is now operated in a circuit traceable from grounded battery, its'winding, lower back cont-act and armature oi'i relay 11, test brush 94 of the sender pre-selector, conductor 95 and front contact and armature to ground, of relays similar to 4 3 at engaged register senders. While relay 12 is held operated, motor ymagnet 15 is actuated in a circuit extending through its winding, back contact and armature, the inner 'front con- `tact and armature o1z relay 12, lowermost sistance to grounded'battery. fit-h the relays 36 and 93 actua-ted, relay 92`is energized vfrom grounded battery, its winding, righthand `front contact and armature of relay 93, outer front contact and armature otrelay 36, to ground. Relay 92 when operated, extends the impulse circuit 'from the register sender to the conductors or' the selected trunk.
1t will be remembered that the relay 13 is locked in series with relay 11 and when relay 14 opens the circuit of relay 11 it eiects the deenergization of the relayv 13 lwhereupon the locking circuit including righthand winding of relay 18 is opened and this relay retracts its armatures. The link finder is of that type which remains in engagement with the trunk last used so that this last described operation is all that is necessary to effect it release. The link circuit in use is, however, guarded by the energization of relay 20, circuit of which extends from ground, itswinding, lett-hand front contact and armature of relay 93, resistance to grounded battery. f
As soon as the trunk circuit of this description has been extended to the distant oiice, the relay 97 of Figure 2 is energized from grounded battery, its winding, through the upper winding of the repeating coil, back contact andL uppermost armature of relay 96, conductor 118 of the trunk, conductor 197 through the brush of the trunk linder, c'onductor 98, inner front contact and armature of relay92, sender nder brush 121, conduc-V tor 99, register controller brush 100 in its norinalposition, conductor 101, winding of relay 102 to ground. Relays 97 and 102 are both energized in these circuits, the operation of relay 102 closes a circuit from ground, its armature and front contact, controller bi'iish 103 in its normal position, back contact, armature and winding ot the motor magnet 104 to grounded battery. The motor magnet thus causes the advance of the controller brushes into their zero position. T he relay 97 of Fig. 2, however, when operated closes a circuit from ground, armature and Vcontact of this relay winding'o't` slow-releasing relay 204 to grounded battery. Relay 204 is thus actuated and connects the lamp 105 in series with a'iiasher 106. Lamp 105 is thereby intermittently lighted to call the cperators attention to the fact lthat a call is awaiting attention on the trunk to which this lamp is individual.
As soon as the operator at the distant oice is in readiness to attend to this call, Vshe depresses the assignment key 107 which extends a circuit trom ground through the Contact ci this key, upper winding of relay 96, conductor 108, the receiver brush 109 in its normal position, back contact, armature and winding Vof the inotorY magnet 110 of the receiver switch to grounded battery.
Relay 96 is also energized in this circuit and closes a locking circuit for itself from grounded battery, contacts of release key 111, conductor 112, winding of relay'113,
ico
conductor 114', lower winding of relay 96, its front contact land armature, conductor 115, lower-most back 'contact and arma-ture of relay116 to ground.v Relay 113 is thereby actuated and closes a circuit by which the motor 1nagnetv110 is operated to advance the receiver brushes into' their first position. Y Rel lay 96 when `operated also extends the conductors 116 andV 117 4leading to'the numerical receiver, to conductors 118 andf119 of' the trunk circuit. Relay 96when operated also opens the previously described circuit of 102 so that this relay deenergizes and advances the sender switch into position 1.
With sender and receiver switches in' positionl, the registration stored up on the' register sender of Fig. 3 is communicated to the number-receiving device of Fig'. 2. This is effected in the '.tollowingpmanner. It will be'remeinbered that the stations relay is actuated in responsev tothe depression of the party key Jy, therefore', with relay 90 operated a circuit is closed from grounded battery resistance. through the armature and front contactof relay 90, conductor 120,*brush 100, conductor 99. brush 121, inner armature and front contact ot relay 92, 'conductors 98, 197 and 118, upper armature and front contact of relay 96, conductor 116, receiver brush I122, conductor 123,l winding oi. relay 124 to ground. Relay 124 is operated in this circuit and is locked actuatedover conductor 125, front contact of relay 113 through the resistance to grounded battery. Also with the sender and receiver switches in position 1, relay 126 (Fig. 3) is operated in a circuit traceable.`
troni grounded' battery through both wind'- ings in series of this relay, sender brush 127 in its first posit-ion, conductor 123, brush 129. outer armature and front contact or relay 92, conductors 130, 131, and 119, inner armature and front Contact of relay 96, cou-I ductor 117, receiver brush 132 in itsfr'st position, lower winding of relay 133 to ground; relay 133 remains inactive. In response to the energization of relay 126.,.thc motor magnet 104 of the sender switch has an operating circuit closed from' grounded battery, winding of this magnet, its armature and back contact, sender brush 103 in position 1, front contact and armature of relay 126 to ground. Under the control vof this circuit the motor magnet advances the brushes of the sender switch into their second position. At'this time a circuit is extended from grounded battery, resistance, left-hand Vwinding ot relay 126, brush 12C7 in its second position. conductor 128,A brush 129, conductors 130, 131 and 119, armature and tront contact of relay 96, conductorll?, brush 132 in its first position, low resistance winding of relay 133 to ground. Y remains operated and relay `133 attracts its armatureand thereby closes an operating Relay .126v
circuit for the inotor magnet-*' of thereceiver-switch from grounded battery-,winding armature and back Contact of this magnet, receiver brush 1-34'in itsl'fii'st position, front contact and armatureofrelay 133`to ground. The motor magnet is thus operated to advance Vthe brushes Aof the Vreceiver switch into their second position. In position 2 aeircuit is closed'from grounded bat` tery, low resistance winding ofrelay 126, brush127 in its-'second position, conductor V128, brush 129, armature and front contact of relay 92, conductors 130, 131 and 119, inner armature and front contact of relay 96, conductor 117, brush 132 in its second position through both the highf resistance and low resistance windings in series of relay 133 to ground. Relay '126 will'notremain operated in series with both windings of relay 133 AandY deenergizes to complete va circuit from ground, its armaturef'and backA Contact, brush 103 in itsv vsecond` position, Iback contact,arinature and winding of the motor magnet 104 to grounded K battery. Under the control ofthis circuit the brushes of the sender switch are advanced into posi; tion 3. The circuit of relay 133 is opened and it deenergizes' to vadvance the receiver switch into position 3. x Vith the sender and receiver switches both in position 3, the relay i.
relay 131 ,is actuated and'thereby closes a.
circuit for causingfthe'inotor magnet 104 to advance the sender s ,witcliinto .position 4. This operationis e'ective toremove liigh lresistance winding of relay 181 from; the
control circuit just described so that relay p isv operated to close the operating circuit for the motor magnet 110 by which the re'- ceiver switch isyafdvance'd intov position 4. When the receiver switch brush 132 goes to 4, the high resist'ai'ice winding ofV 180`V is cut z. into circuit and allows' relay 18,1 to*v release With the to move th'e'sender to position 5. l sender l.in positifonf, the circuit to 180 'is openedand' itreleases to Amove the 'receiver to position 5. i
From the foregoing described operation of relays 126, 133", 181' and' 180V it will be noted lthat first 'one of the relays of these pairs is operated and subsequently the other relay of the' saine pair is operated to {ad-jk Vance the receiver switchinto a succeeding position.' It will thus beseen that'the sender- 'switch is rst advanced oneY step to complete a circuit for advancing the receiver switch a single step and this operation completes a circuit for' advancing the'seii'der switch into.
icc
lil
its next succeeding position. This alternate advancing of' first the sender switch and then the receiver switch, each under the con trol of the other, insures that both switches will be in synchronism, so that the designation stored up on the relay registers may be transferredto relays at the distant oiiice.
When the sender and receiver switches are passing through position 6, a circuit is closed from ground at the lower armature and front contact of relay, 68, conductor 137, brush 100, conductor 99, sender finder brush 121, inner armature and front contact of relay 92, conductors 98, 197 and 118, upper armature and front contact of relay 96, conductor 116, brush 122, winding of relay 138 to grounded battery. Relay 138 is thus operated and is locked in this condition to ground over conductor 154. Vhen the sender and receiver switches are passing through position 11 the registration stored up on the hundreds relay register is transferred tothe hundreds group of' relays at the distant oiice over a circuit completed from grounded battery, resistancei armature and front Contact of relay 80, cont uctor 139, brush and through the circuit previously described including the tip conductor 118 of the trunk to the distant oflice, to brush 122 of the receiver, conductor 140, winding of relay 143 to ground. Relay 143 is thus operated and is locked actuated over the conductor 125 to grounded battery at the armature and front contact of relay 113. As the sender and receiver switches are advanced through position 16, the registration stored up on the tens register is transmitted to the distant oice over conductor 141 and the tip side of the signalling circuit previously described, brush 122 ofthe receiver switch, conductor 142,v winding of relay 144 to groundedbattery. Relay 144 is thus energized and is locked operated to ground over conductor 154. The registration stored up on the units register is transmitted to the distant oliice over conductors 145 and 146 while the sender and receiver switches arev passing throughV positions17 and 18, and these mentioned conductors are included in circuits for actuating relays 147 and 149 at the distant office. Relay 147 when, actuated is locked in this condition to grounded battery over conductor 125,Y while relay 149 when operated, is locked in this condition to ground over conductor 154. It will thus be seen that the registration stored up at the originating oiiice is repeated to the distant oliice and is there recorded on the groups of relays designated thousands, hundreds, tens,
.units and stations.
At this time the release of the trunk finder, the sender finder and the sender switch is accomplished as will be described. When the brush 103 of the sender switch reaches position 21 it closes a circuit for opingleses erating the release relay 96 appearing. at the I middle of Figure 1. This circuit may be traced as extending from ground, winding of relay 96, front contact and armature of.
relay 36, sender brush 186, conductor 189,
.described impulse circuit while the relay 20 removes the guarding conditionr from the link circuit rendering it selectable for use/ on a succeeding call, also the operationof the relay 96 completes a circuit which will now operate marginal relay- 29 which-connects the trunk circuit between the two oilices in question. relay 29 extends from grounded battery through the resistance armature and front contact of relay 96, brush 28, upper winding of relay 29, left-hand winding of relay 26 to ground at the armature and back contact of a relay similar to 26 associated with an idle trunk or if all of the trunks are busy, through the winding of relay 21 to ground.
In accordance with the present invention it is proposed to have one set of ten numerical lamps and four station lamps. The stations designation of ithe wanted subscriber first appears on one of the stations lamps and thereafter the digits of this designation appear one at a time on the ten numerical lamps appearing at the 'lower part of Fig. 2. This is effected as will now be described.
When the receiver switch is advanced into position 21 it `closes a circuit from grounded battery, winding of the motor magnet 110, its armature and back Contact, brush 134,'conductor 155, winding of relay 156 to ground. Relay 156 when thus operated closes Va circuit for the motor magnet 157 of a small distributor switchprovided with five sets or brushes disclosed adjacent to each other, near the center otF'ig. 2. yl`he This operating circuit of the operating circuit for this motor magnet exsubsequently to the groups of tens and units .Y
relays that have been actuated. It has been assumed that the vfirst digit of the wanted number is 2, and it will be observed by tracing out vthe eircitjfr fatutnfg Lamp No. 2 that "relay 152 inistjhefoperated. This Ais fetfecitedfw'hen the bruishl'15-8 'of ithe distributor switch jpassiiifg' fthrouzgh its :sec-
ond position, at `ufhichftiine `theI "relay 152g'.
is connected to "ground multiple yiith Aactuated thousands relay 138,jouerfc'onductor 154. Since the 'neii-t- Vdigit is 3 jis necessary to light the No. lamp Whichg'ixs effec-ted by actuating relay 151. Relay 151 is joperated When the brush, '159 of Lth'edistributo-r is 4advanced l'to 'position 4 where- 'a circ-uit is completedfoverconductor to the Afrontvcontact and armature -rof "actuated hundreds relayl 143, to `L fgr'o'unded battery over conductor 125. 'In order `to li'ghtfthe No. 4; larn'p 'it isf,necessary tofac'tuatejrellay and this is -eife'ctedtiihenvthe,brush 160 of .the distributor 'switch vis ad'v'a'nced-'te its siXth position Where -a Iciiuit. is completed 4over conductor 142 andthe front contact lig'ht vth'efNfo. lai'iipli-t fis necessary. topper- 'ate bjothfthejelays 15e '211111,153. ,Thiers efgfetted 'when the distribuer tras-hes 15e faire 161 yare adi/landed 'vihtoftheii' eighth lposition "at which ftiine relay A[is Ardperated 'in 'a ',oi'r- 'cu'it `dosed 'frein gri Yrfdvd batteijy,wfv'inding O'f this relay, distributorbrushie,armature fand "front contaet ,of actu'ated unitswrela'y 149 yto ground, ever conductor A1545 Relay 153 is operated in "a circuit traceableffrorn grppnd, its wi-riding, 'distributor huish, 161, conductorv 163, froiit, 'contact 'and arrri'a'tu're of 'a 'second actuated unitsfrel'ayf147, `to grounded -batterfy oifer 'cond-uctor( 125. It will -o-t cour'sefhe understood that the speed of operatin ofthe .distributor Asitz'itch Ycan he Varied at will, so 'thatfthe various lamps Willremai'n lighted long 'enough Vso that the operator can ascertainthedesigna- -tion of the Wanted nuniber. In the yevent that the .operatordid not 'observe the designation indicated by :the Alamps on the first rotation of the distributor su'fitch,l it will continue to rotate until the Qperator'receives the designation ,and inserts vthe vcia-lling 'plug' 164 in the multiple jack 165 of the called line.v Y f i *y ,u Y`When 'the `operator effects this connection, relay 116 associated'zf-With the connecting cord circuit is operated froin'grounded battary., itsvwinding, the sleeves ofthe plug 16.4 and jack 165A seriesiWit-h' the 'cut-'off relay 166 Jto groundm'Relayl-l fattracts its arinatures and fat .its 'upper a-'rrnag ture. closesI athreakfpoiirt int-he -tipside pf theA cord. circuit. H,At ."tl1e iiiIei. a-ii-n'atli're :and front contact of, relayg1'1i6 abreak-'po-int is `closed iin the circuit of the'supfervisory lamp 105 `in series 'with the [pilot relay, but this 4circuit :is ineffective at, thisftme A.Since the, relay-'294 ,iS-Qt'erateft Mirthe Innerer.- rnature and Aloac'k contaft of relay 116,
Y ry"fro1`n the 'hol .h ding gri-Und 'f the right-hand ar -fef'fana back; edited dinggconductor 125 and 'i condli'ctor. 154. At 1 Qf relayiia, afefsformgeircuit islcloseu fer rinature. 'and vback[Contact of v'relay del jjfithis iastj'deseri-bed dreun; the brushes V109, l122, ierland-132m 'the receiver switch are advanced into "their no'rmalljposition.vk As soon as brush 13,4Jo`f the receiver Vswitch leaves f'pofsitio'n v'ti'wlveln'ty one, yrelay 156 deth tering 'circuit is closed for re iaiid.-yoaak1dontagii; the meter maget, brush 167 .of the "di'stribiiteiv-fsvfvitch in anyNfone` of its olf-normal positions, to
:After atelier-ternes iiistart-'ea` tapping i 1621 into Vthe multiplei-j ack '165,` she depresses @neef the "ringing,V keys to 'supply ,ringing fcu' rent,'ofth'e"p'roper character to signal sta- "tion ffJll,onthe-Wanted line. Let itV be as- "su'inedrfthat, the key No. iis ithekey for :signalling party J, l,W'hen 'the vkey 168 1s depressed it .fcloses-its contacts 178 to aotiia'te 'the/ringing vrelay .f 171 in fa circuit extendingfoin grounded battery, resistance,
upper 'winding'foffthisrelay, contacts "178` backcontact'andfarinature of relay 176 to ground .at the Y uppermost armature and figont -Contact .of relay .2021.-` The ringing relay when loperated .closes .a locking circuit for itselfthrough its lower windin'gf,inner front contact 'and armature to ground at the uppermost` arinatu re and front contact of y'relayQOl. n lith the 'ringing key 1168 depressed and yvith the ,ringinlgfrelay V11/'1 'locked operated,a sourcex'of ringing` current is connected over conductor y 169, contacts of the 'rilrigin'g` key 168 and lnormal `contacts ofthe other keys precedingfit inseries, lower front er 'switthwhich extends, 'from t 5 a. ture,ahdjbaekeentactiof,relay 11,56,
vcontact xand.a 1rna'ture of relay 2021, Windof Athejtri-p -relay 170,:lower1nost front Contact afndarrhatuiie of; the ringing relay `17 1, uring,conductfo f`rl of .the=.eord, ring centac'ts of ,the ,plug w164v and 'jack 165,. over r"the lowerf snide of the 'want dfline f'through 4"the hell2 eircuit 'ot station .rJ,;oyer,-t he l upper side 'ofthe "Waiite'drhline `through 'the' ftip. contacts of thej ack .,165v vand noyer the tip 1163211161; thro-ugh I.theire- Contact bf ,ffelayf Sieben@ @9eme the control of this circuit the bell-.at station J is actuated untilthesubscriber there at responds, at which vtime the triprelay 170 will receive suiiicientv current to be actuated and attracts its armature. rfhis short-circuits the ringing relayA "171 and thereby causes it to `'retract its armatures tov disconnect ringing current from the wanted line and to close a break-point in the ring conductor off the cord circuit.
Talking battery is suppliedvto the called party through the` windingsof supervisory relay 172 and when the called party responds, this relay is actuated to complete a circuit for relay 173 in series withthe supervisory relay 1740ic the cord circuit at the originating oice. To provide supervision at .the originating oiiice, relay 173 is o perated in series with the relay-174 of the cord circuit at the originating oice, while to give supervision to the terminating operator, the tip side of the circuit is connected through the.r windings of relays 17 5 and 97. K Talking battery is lsupplied to the calling partythrough the left-handwindings of the repeating coil in the-A operators cord circuit.
Vhen the calling subscriber A terminates the call, a supervisory relay such as 17 9 is released in the operatoids cord circuit at the ture of relay 116, winding .of the pilot relayv to ground. v
In the event that .the called party terminates the connection by replacing Ahis receii'eron its switch-hook before the calling party hangs up, thenthe relay 172 decnergizes and opens the circuit including relays 1.73. and 174. Relay 174 will then deenergize to light a disconnect lamp not shownll at the A operators position. This operator. will then proceed to remove the plugs 4.and 7 ofthe jacks 5 .and 8.
'In Figs. 4 and ,5 there are shown modified circuits for the wanted oice to replace those otFig. 2. 1t will be understood of course that the circuitsof Fig. 4.are to be connected to those of Fig. 1 and operate in a manner identical with the circuits controlling the receiver vswitch yand theY talking circuit' of Fig. 2. In 5, however, there is a somewhat modified arrangement for con- Ithe -wanted station. `will be understoodof course that the number is stored up in the saine manner as."
thousands and hundreds digits and subsequently light the tens and units lamps corresponding to the tens and units digitsof In 'this modiiication 1t previously described on the relay registers of Fig.4 3. It will also be understood'that the! sender VVswitch of Fig. 3 will operate in connection with a receiver switch at Fig. 4 `in thesame manner as previously,described. lAlso in this operation some of the relays of the thousands, hundreds, tens and units vrelays will be actuated and locked operated in the manner previously described'q It ywill now be assumed that vktheniodii fied circuits of Figs. 4 and 5 are. to be 'used instead of the circuits of Fig. 2. It will also be assumed thatthe designation ot the A'wt-inted party is Main 2345-fJ-,asin the previous case. It will'be noted in Figs. 4 and 5 that the same reference characters have been applied to the vportions of Figsi'4 and 5 that are identical with Fig. 2, which willrender it unnecessary to describe the operation ci the receiver switch or the receipt and storing of the designation onthe thousands, hundreds, tens, units and sta'- tions groups of relays of igure 5.` The descriptio-n may therefore be taken up at the point where the thousands relay 138 and the Il@ f hundreds relay 143, tens relay 144, the units relays 1 47 and 149, and the stations relay 124 have been' lockedactuated. It will also be assumed that the receiver switch has been advanced to position 217 in which position acircuit is completed over conductor 155 to actuate the relay 156, As in the previous case this effects the operation of the motor magnet 157 which advances the vbrushes of the small distributor switch in the same manner as in the first. described circuits.
It will be remembered that in theiirst modification the numeral lamps were lighted one at a time to. indicate the desired number, butin the modification now under consideratiomtwo numeral lamps are lighted.simultaneously.V This is effected in the following manner: While the brush 158 of the distributor switch is passing through position 2g the leftdiand winding of .relay 201 isconnected in a circuit in multiple with the relay 138 ot the thousands groups of relays. .This circuit .may Vbe tracedk from grounded battery, left-hand winding et re-V ture of relay 156. Wheil vthe,.hetrlb brush 200 isA Y21 lv2f1`11ccl fofpotti he switching .rely'QOQiS ooerate vi 1`1'zrl'e closed to ground throughfhfebrshQOOf when the ,distributor Aswitch tion ll,v relay Q'Orh's an oier llt closed ,from,.groun'd, its .right-hemd yvlndgng, front Contact 4and 'arnit'resjo'f "rel brs'h 1597 conductorf140`,r frofri't oarmature of: relziy 143l to he tery yover oohcllto'r 125,.l Rel opertecl isflooke n thifs'oondl its left-hand frot polgatfs'd ground -ltgtheffroIlt-oo [al of relay 156', and Whilefl'e distrib Y 200 is passing, through postops, 6 n
a 'lamp in each of l A' ated. It will bfe notdthat. rel'ziyZQ position 2. 2,001'
ors- 'p'slhon Yfor iut to (a wanted right-hand arliaflre c'i'o lay 203 through the No. Sla Contact and ,armature oi` utor brush QOOfto.QThe',.:Noz
info al meipl'e raf@ positions, a terminating oflice having a B operators position, telephone lines terminating in each operators position, trunk circuits terminating at said A operators positions, means for connectingtsaid" trunk circuits to said B operators position, a cord circuit'at cachot1 said A operators7 positions 'for connecting a calling line to a trunk circuit, a plurality otregister senders' commonto said A operators positions, means responsive to the connection of a cord circuit tov atrunk circuit for seizing a register sender for use, means for. variably adjusting said seized register sender, an indicating device at said B operators position arranged to be variably operated in accordance with the adjustment of said register sender, means for synchronizing said sender and indicating device and meansjcontrolled at said B opverators position for 'connectingsaid trunk circuit to a wanted line. .4. In a telephone system, an-Aoperators position, a B operators position, a trunk circuit for connecting said positions, telephone lines terminating at each of saidp'ositions, means for connecting aca'll-ing line at thel A7 Ioperators position to said trunk circuit, a variably operable sender at said A operators position arranged to be adjusted iii-accordance. with theV designation of the wanted line, a single set of tennumerical keys at said A operators position for adjusting said sender a receiver at said B operators position comprising receiving mechanism for each digit of the-wanted number,vsaid receiver being adjusted from said senderlampsassociated therewith less in number thanthe number of said mechanisms andmeans for connecting said Vtrunk circuit-to a wanted telephone line as indicated. Y
5. In a telephone system, an- A operator7s position, a B operators position, a trunk circuit forconnecting said positions, telephonelines terminating at each of said positions, means for connecting a calling line at the A operators position to said trunk circuit, a variably operablesender at said-A operators position arranged hto be adjusted in accordance with the. designation of the wanted line, a receiver at said B operator-s position comprising receiving mechanisms Vfor each digit ofthe wantedA number, sets of lampsassociated therewith less in. number thanthe number of said mechanisms, `means for synchronizing the operation of said sender and, adjusted receiver, and means for connecting said ,trunk circuit to a wanted telephone line as indicated. n Y n l y 6. In a telephoneV system, an A operators position, a B operators position, a trunk circuit for connecting said positions, telephonerlines terminating in each position,
f vmeans for connecting a calling telephone incassa line at said A o erators osition'to said atrunk circuit, av variably operable sending device connectible to said trunk circuit, a receiving deviceV atsaid B operators position comprising a set of receiving mechanisms, one for each digit of the wanted number, said mechansms being arranged to be variably operated under the control of said sender, a'single set ofkeys at the A operators positionv for controlling the operation offs'aid sender, means for locking the mechanisms in their actuated condition, a singleV Vset ,of indicating lamps arranged to beY opsition arranged to be variably adjusted in accordance with the designation of the wanted` line, means for connecting said senderto f said trunk, a group of receiving. relays at said B operators position arranged to be variably operated under the control of said sender over said. trunk, aysetofhindicating lamps repeatedly operated under the control of two di'erent groups of relays, and means 'for-connecting said trunk circuit to a wantedA line as indicated.
. "8. In a telephoneisystem, an originating office, a pluralityvof other oiiices, telephone linesterminating ateach of said oiiices, an j individual group of secondary trunks leading to each of said offices from the said originating office, a group of primary trunks at the originating otlice for each oiiice reached therefrom, each primary trunk terminating atene end in a manual switch, automatic means for connecting the other end of each primary `trunk to an idle secondary trunk, means responsive 'to' the manual connection of a calling line to a primary trunk to eii'ect the selection of4 an idle secondary trunk, means responsive to such selection to cause said automatic means to seize .the selected secondary trunk, Aa plurality of register senders for common use'at said originating oiiic'e, means for associating-'an Yidleregister senden Vwith the selected secondary trunk, meansfor variably adjusting said selected senderin accordance with the designation ofthe wanted line, ymeans associated ywith the selected'trunk atthe distant oice and operatedlover said selected trunk under the control of the adjusted register sender for indicating thereat thedesignation of the wanted line, and means at the wanted cnice lessees,
forv completing the connectiony inI accordance Withsuchdesignation. n 9- In a, telephone System,.an originating office,l a distant office, a pluralityv of l opera?` tors positionsatl each of said offices, tel'e phone lines terminating at eacliuof said of# ices,I trunk-circuitsifor connectingfsaid offices, certain of which terminateatfthe originatingy oiiiceI in jacks, operators` cord circuits at the originating o'iiicetor connetinga calling line through ay jack to a1 trfunl` leading` to said: distant v'otlic`e,l a key-set atl each operators p osition, a plurality'iof register senders common to a plurality,- o'i po-iY sitions atsaid originatingoliice, means.. re-Y sponsive to the connection, of aj calling line toa trunk for associating. an ,idle register sender with, said;v trunk and fon connecting thezsame to the key-setoffthe operator that.
has completed theY connection, ofthe'. callingv line to the trunk, said register sender beg-'l ing variably operated lin accordancewithV the designation et,v thev `Wantedline), underil the control of said operators key-set, means associated With the, operators. positions at the distant office and operated under the control of the adjusted register senderY for indicating the designation of the Wanted telephone line at one of said last-mentioned operators positions, and means at this lastmentioned operators position for completing the extended connection.
10.' In a telephone system, an originating oiiice, a distant oi'ice, telephone lines terminating at each of said oiiices, trunk circuits for connecting said offices, a plurality of operators positions at the originating office in eachY of which telephone lines terminate, a plurality of trunk circuits and means at the originating oflice for connecting the same to calling telephone lines, a plurality of register sendersrcommon to said operators positions, means for associating a register sender With one trunk circuit leading to the distant oiiice, means at each of said positions for varia-bly adjusting a register sender in accordance With the designation of a Wanted telephone line at the distant oilice, an operators position at the distant oiiice in Which said trunk circuit terminates, a set of numerical lamps at the distant ofce, means at this oiiice operating under the control of a single adjustment of said register sender for operating said lamps a plurality of times to give the designation of the wanted line, and means for connecting the extended trunk circuit to said Wanted line.
1l. In a telephone system, an A operators position, a B operators position, a trunk circuit connecting said positions, telephone lines terminating at said positions, means for connecting a calling line at the A operators position to said trunk circuit, a
variably operable sender at said A operatei-fs position be adjusted. in accordance,
designation, dfi-the.' ivanted'j tele-j; e; a'receverll said '.BL'oper-tofrs comprising; 'mechanism for @aanv Wit dig j die wanted' number, said(E receiver loV adjusted; under the; controlgof, said sender,T on more ,sets of; lamps associated With, sa" y i thanwtli'e" n, lbenorfisafd mechanisms, means foriV connectjinfr saidfmechansms in succestoj 'saidgj farnfps,A andi: means for connectingsadtrunlfcircuit 'to a. wanted tele- 1:94 In a'telephone system, operatoris adjusted" in; werden@ gaat. .the designation,
Wanted, telephone, line, a receiver'fat ofc'ftlie said'B o erjatorsgposition, comprisingja receirnamaliaam.- for. eahsdigiffofthe Wa.nted"number, 'sa-id Vreceiver'y being adjusted under the control of said sender, one or more sets of lamps associated With said receiver switch less in number than the number of said mechanisms, a progressively movable switch for connecting said sets of lamps to said mechanisms in succession, and means for connecting said trunk circuit to a Wanted telephone line.
13. In a telephone system, an originating olice having an A operators position, ,a terminating office having a B operators position, telephone-lines terminating at each operators position, a primary trunk circuit terminating at said A operators position, a plurality of secondary trunks terminat-ing at said B operators position, an automatic switch for extending said primary trunk to a selected secondary trunlna plurality of register senders at said A- operators position, a linlr circuit terminating at each end in a progressively movable switch for connecting an idle register sender to a secondary trunk, means responsive to the connection of said link circuit to said secondary trunk for causing said automatic switch to extend the primary trunk tothe position, a B operators position-,telephone linesterminating in each of said positlons, aV primary trunk terminating in said A; operators position, manual means for connect`V ing a calling telephone line at anA operators position to said primary trunk, a plurality of secondaryy .trunks extending to said B operators position, a plurality' of register senders, link circuits each terminating at its ends in progressively movable switches, a link finder switch, means operating responsive to the connection of said calling telephone line to said primary trunk for causing said link finder to seize an Aidle B operators position` means including said adjusted register sender forvariably oper ating said indicating device to variably indicate the designation of the wanted tele-y phone line, and manual means. at said`B`- operators position for extending the select` ed secondary trunk to said wanted telephone' line. A
l5. In a telephone system, an originating ofice, a distant office, telephone lines terminating at each of said oiices, trunk circuitsY interconnecting said oiices, means at the originatmg omce for connecting a calling telephone line through a trunk to said distantolfice, a sender at the originating oiice variably operable in accordance with the designation of the Wanted telephone line,
an indicating device at said second oiliceY arranged to be controlled by said sender,
manual means for connecting. the Vextended telephone lineto the Wanted telephone line,
andmeans for causing said indicating devicerto repeat its designation until the oper-- ation of said manual means.
In witness whereof, I hereunto subscribe my namethis 31st day of March A. D. 1921.
WINFRED T. POWELL. Y
US458318A 1921-04-04 1921-04-04 Interoffice telephone system Expired - Lifetime US1494866A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US458318A US1494866A (en) 1921-04-04 1921-04-04 Interoffice telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US458318A US1494866A (en) 1921-04-04 1921-04-04 Interoffice telephone system

Publications (1)

Publication Number Publication Date
US1494866A true US1494866A (en) 1924-05-20

Family

ID=23820309

Family Applications (1)

Application Number Title Priority Date Filing Date
US458318A Expired - Lifetime US1494866A (en) 1921-04-04 1921-04-04 Interoffice telephone system

Country Status (1)

Country Link
US (1) US1494866A (en)

Similar Documents

Publication Publication Date Title
US1917884A (en) Call charging telephone system
US1494866A (en) Interoffice telephone system
US1732185A (en) Telephone system
US1861754A (en) Call distributing telephone system
US1907240A (en) Service observing equipment
US1695043A (en) Telephone-exchange system
US1644727A (en) By-pass selector circuit
US1504258A (en) Telephone-exchange system
US1484614A (en) Telephone system
US1613624A (en) Machine-switching telephone-exchange system
US1613613A (en) Telephone-exchange system
US1767962A (en) Automatic telephone-exchange system
US1559244A (en) Telephone-exchange system
US1386719A (en) Telephone system
USRE15310E (en) Telephone-exchange system
US1830678A (en) Telephone system
US1844147A (en) Automatic and semiautomatic telephone system
US1743429A (en) Telephone-exchange system
US1641235A (en) Manual telephone system
US1840109A (en) Telephone system
US2327436A (en) Telephone system
US1658416A (en) Telephone system
US1991170A (en) Telephone system
US1889229A (en) Telephone system
US1812641A (en) Remote control magneto telephone system