US1767594A - Connecter switch - Google Patents

Description

Junej24, 1930. C, ELOMAX 1,767,594`

CONNECTER SWITCH Filed sept. 21, 1927l mrsnnr lar ense E. L Umax Patented June V24, 1930 UNITEDsrArEs OFFICE? CLARENCE E. Lor/IAX, OEv AAK PARK, ILLINOIS, AssrcNoyR 'ro REsERvE'r-IOLDING rCoM- PANY, 0E xANsAs CITY, MISSOURI, A CORPORATION OE DELAWARE CONNECTER swI'rcI-r Application led September 21, 1927,. .Serial No. 2$3,953.

This invention relates kin general to automatic switches for telephone systems, and the object of the inventionis the provision of a new and improved'co'nnecter switch.

Heretofore it has been found in practice that the applicationof ringing vcurrent to the line conductors ofthecalled line `often causes the line relay associated with the lineswitch of the called line to operate be- Aforey the cut-oit relay of .the lineswitch has had time to disconnect the line relay.

The main object of the present invention is the provision ofk an improvedcircuit arrangement in a connecter switch for delaying-the application of ringing currentto the line conductors of the called line until the cut-off relay of the called linehas had time to operate and disconnect the line relay. kThis is accomplished by the addi- 29 tion of a ringing relay which energizesl in order to connect ringing current to the called line afterA the switching relay has operated. Incidentally this permitsa ,number of springs heretofore operated by the switching relay to be voperated by the ringing relay. y

Another feature of the present invention .relates tothe novel circuit arrangements in the connecter switch for-"connecting dial Y 30 tone to the calling line after a (connecter l switch is seized by the lineswitclrof a calling line.- The dial tone is provided to inform the calling subscriber 'that `he may proceed with the dialling operation to complete the desired connection. Y

Referring now to the drawings, there is shown by means of the usual circuit diagrams the new and improved connecter switch H, a rotary lineswitch LS, andan 40 individual subscribers lsubstation A. Y

The connecter switch His of the well known Strowger vertical and rotary type and has access to automatic subscribers lines such as the lines of substation A. In the V present case, vthe connecter H is yaccessible normal position andwhich lha'veracceL-is to' connecter vswitches such as connecter H.

VThe substation A consists or" a calling device and the usual instrumentalities to envablethe subscriber to carryk on conversation. The line of substation A terminates in the lineswitch LS and connecter bank contacts in connecterssuch as .connecter f Y Withthis general description of the drawings in mind, the operationof the circuits may. now be explained inr detail. For this purpose, it willbe assumed that an automatic subscriber desires to obtain connection with subscriber A. vThe customary subscribers substation yand individuall lineswitch being wellf understood by those skilled in the art and forming no part oi the present invention, it is therefore believed that it will suilicev to say that in'response to the removal ofy the receiver by thecalling subscriber,V his individual lineswitch seizes anv idle trunk leading to an idlefconnecter switch Vsuch as indicated bythe reference f character H. Let us assume that the conlnecter H is the connecter seized by the call-v ing lineswitch.v When the calling lineswitch comes to rest upon the contacts associated with the conductors 20,21,y and 22 the switching relay ofthe lineswitch completes anuenergizing circuit for the line relay. 4;'

ofthe connecter as follows: frompground by way of normally closed springs controlledby armature 38, lower winding of line relay il, normallyr closed` springs controlled by armature 32,v conductor 21, over,

.loop `baclto conductor 20, normally closed Vsprings controlled by .armature ,31, and

and its worling'contact completes an ener-Wk gizing circuit for energizing the change over series relayl 6 and the releaserelay 5 in series.v Slow-to-release relay 5,. upon energizing vover the vabove traced circuit, connects,

ground to the release, conductor 22 at armature 36.; saidV ground completingav holding circuit for maintainingthe calling lineswitch inan operated position and, in addition, makes the trunk line to the, con-l necter H busy to all other lineswitches having access thereto; at armature 37 and its Working contact prepares the circuit for the vertical magnet 13, and at itsresting contact opens a point in the release circuit; and at armature 351prepares a lockingy circuit for ring cut-off relay 7 and switching relay l1. Y

Sloweto-release change over relayV 6, upon energizing over the above traced circuit, closes a circuitV at armature 39 for' maintaining itself in operated position during the vertical impulses; at armature disconnects the rotary seriesrelay 10 and theV rotary magnet 14'at its resting contact and at its workingA contact prepares a circuit for operating vertical magnetv 13. In ad- Y dition, relay 6 at armature 38 disconnects 'ground from the lower winding ol" relay 4 and substitutes the normally grounded dial toneV vconductor 25 therefor. Responsive to the connection of dial vtone 'to the lower winding of line relay 4 an audible tone is v transmitted to the calling subscriber' `over the circuit :previously'traced for the line Vrelay v4. `When the calling subscriber hears 'the Vdial tonel he will proceed to dial the called subscribers telephone number.V a Thecalling subscriber may now manipulate the callin@ devicein accordance withthe digits in' the rtelephone number of the desired called subscriber.'` Due to the operation of the calling' device by the calling subscriber, the'circuit of the line relay `4 is 'interrupted a plurality of times in the well known manner and the line relay -responding to these circuit"interruptions, deenergizes a like .number yoit times. lllach ltime.V Vline Arelay V4 deenergizesa vcircuit is closed or energizing the change-'over relay A6 and Y vertical magnet 13 as follows: from ground by way voit armature 34 in its resting contact, Varmature 37 and its working lcontact vand armature 39 `for `maintaining slow-torelease relay v"6 in energized positionand by way of armature 40 vand itsv workinggcon- 'tact to vertical magnet 13. By the opera- [tion of the verticalV magnet 13, the switch shaft and wipers are raised until the wipers '60, 61 and `(52 areopposite vthe desired levelv of bank contacts yinwhich the line conduc-A tors of ythe called line terminate. As :soon asV theA switch steps off-normal, oli-normal contacts 56 close thereby shorting the upper winding of the 'changefover relay 6. This relay, being slow `acting is maintained energized during thevertiical impulses by way of its lower winding as previously described. After the termination ofV the vertical impulses, line relay 4 energizes and opens the circuit `for maintaining the change-over re- 'lay G energized,whereupon said relay re- ',leases after an interval. vChange-over relay 6, upon `deenergiz'ing, at armature 38 substitutes direct ground for conductor 25; and

at the resting contact of armature 40 pre-V pares a circuit for the rotary magnet 14 and at its working contact opens the Vcircuit of the vertical magnet.

The calling subscriber may nowV dial the last digit of the called number. 'In response 'to the operation` of the Vcalling Vdevice by the calling subscriber, the circuit for the.

the switch wipers are rotated step-by-step n and are finally brought tores't in engagement with the particular set or contacts in which the line of substation A is terminated, these contacts being indicated inthe drawings by reference characters 70, 71, and 7 2. The slow acting relay 10 is energized in multiple with the rotary magnet and maintains its armatures attracted throughout Vthe rotarymovement. At armature 50 series relay 1G opens the circuit orp switching relay 11 and prepares a circuit including, the busy relay '8 for testing the called line, and at armature 51 maintains its own circuit and the circuit or" the rotary magnet 14 independent of armature 45. necter H now depends upon whether the called line is busy or not. .Y

ltrwill now bejassuined that the Vline of substation A is busy when called. Under `these circumstances there will be a ground potential upon the contact 72 and when-the ytest wiper 62 'comesto rest 1n engagement therewith the busy relay 3 will be energized.`

over a circuit as follows: ground on test contact `72,.test wiper G2, armature 50-and its working contact, armature 47,`and winding 'of busy relay 8 to battery. Shortly after the impulses cease, slow acting series 'relay` 10 deenergizes and completes a locl.

ing circuit for the busy relay as follows:

rlhe operation of the conv ground by way of grounded release trunk conductorV 22, armature 44a-nd its working contact, normally closed springs controlledv by armature 50, armature 47 ,and winding of busy relay 8 to battery. kBusy relay 8, upon energizing, at armature 45 opens'the circuit of the rotary magnet 14, and vat armature 46 connects the busy tone to conductor 21. The calling subscriber is now given the 'busy tone in the well known manner.

lVhen the calling subscriber hears the well known busy tone, he will replace his receiver thereby opening the circuit of line-l relay 4. At armature S4 and its working contact .line relay4 opens the Vcircuit of slow-to-release relay 5 which thereupondeenergizes,.and at arinature-34 and its rest-l ing contact prepares a circuit for energizing the. release magnet 12. v Slow-to-release' relay 5, upon deenergizing,. atjarmature .36 removes ground from the' release trunk conductor 22` thereby permitting therelease o-f the callingflineswtch and .by the removal yof ground from the release trunk conductor 22the locking circuit of the busy relay 8 is opened whereupon said relay deener- 'gizea v. At armature 37 and its resting conf tact release relay 5 closes a circuit for. energizing the releasejmagnet 12 as follows: ground by way of armature x84 and its rest ing contact, a '1mature4 374 and its resting contact, armature 38, off-normal springs 57,

and the winding of the release magnet 12 tobattery. The release magnet 12 energizes over the: above traced" circuit and restores theswitch wipers-to theirnorinal position after vwhich the od-'normal springs 57 open the circuit of the4v release magnet 12 in the usual. manner. l All "the apparatus used to vextend the connection are in normal posif tion and may be used for .other calls.

Having explained y. what occurs ywhen Ythe calledline is busy, it will now be assumed tl'iatA the' calledjline isI idle. Suchbeing` the case, when 'the .test wiper l62 comes to liest in engagement withfa test contact 72, it

Y will find no ground potential and the busy relay 8 will not be energized. Instead, when the. slow; acting relayy lOffalls back, a vcircuit isl closedthrougli ,the lower winding of the switching relay 11 as follows.:v from ground by way ofnarniature l36,armature 44 and itsxresting contact, lowerwinding of `switching relay l1, resting` contact of armature 50. and 'saidparinature, wiperr 62, bank .cont`act`, 72,. conductor.Y 4,` winding of cutoilrelay 76, and '.windingof, magnet 81-to battery. Uponfthe closure ofthe above traced circuit :the vcut-lofi .relay 7 6 .of the r`lineswitch, LS roperates to.` clearfthe line yof the.v substation A- from lits normal' battery grciindjconiiections 'in 'the lineswitch LS.. Because of. 'the well known mechanical 1 interlocking arrangement vof the rotary lineswitclrthe wiper-sofrk the lineswitch areV .net ccnnected up .attliis time. In practice, due to yfaulty adjustment vof the, .cut-off 4relayfit maylpull up a-trifle slowly with the result that ifringingcurrent.isfat once Aapplied to: the calledline the line". relay Vwill flutter momentarily. Inorder to vercoine' tliis,f.ringi ng relay `9l has been added -inthe connector which haslitsenergizing circuit .closed whenr fthezswitching'relay is fully ',Operatedl.,Theinterval of time that ity takes 'Y fthe' switclfiingv relay and then the .ringing relay.: to. energize yissufficient to, enable the v.cujt-Aorelay .tobe fully. operated before the ving beencorn'plete'd, ysubscribers may Iconverse 'as desired.

ringing relay applies ringing current to the line.v i

vThe switching relay 11, upon energizing,

closes at armature 53 a locking circuitfor relay Sand at armatures 48 and 49 connects current to the line conductors ofthe ringing H for ringing the called subscribconnecter er A.v The ringing circuitmaybe traced as y follows: .interrupted generator Int. Gen., armature 48, lowerwinding ofring cut-oil? relay' 7, resting contact 'of armature 41 and subscriberls line conductor 73,the bridged ringerand condenser at substation A., sub- 9e said armature,`wiper "60, bank contactk 70,

scribers line conductor 75, bank contactj71,

wiper l61, armature 43 and its resting contact, armature l49 Iand itsworking contact, andy resistance R lto battery. Ringfback tone is connected tothe calling subscriber by way of armature 58 in the usualmanner.

When the calledV subscriberl answers, the ring cut-oil' relay ture 42 completes a by way of armature. At armatures 41 and 43`relay 7 disconnects ringing current fromthe called lineand completes the talking circuit b etween'thecalling and called subscribers, and in. addition, -coinpletes ya .circuit for energizing the backbridge relay 3 iveifivthe1v called subscribers'loop; Back :bridge relay 3,'up'on energizing', 4reverses 4the flowV of 'current'to lineA at 'armatures the l'calling subscriberfs 31 and 32',.at armature 130,*connects ground. to the conductor 59 for 100V f 7 energizes Vand atarmalocking'circuit for `itself f maintainingy relaysj7 andf 1lji operated,

at armature '33 opens the circuitjto the revhangs up. Y The .reversal of currentl to ythe vcalling line rvmay be used fori yoperating `a meter if'desired. Theconneetion now hay'- tlie replacement of thereceiveriby the kcalling subscribenthe circuit of opened and i said 'A relay deenergizesf armature34 line 'relay4 opens' the,circuit of slow/to-rel'easeIk vrelay After'the'conversation and responsive to ..125 'Y 'line relay 41s I .At

5 andfinaddition yprepares a circuit 'for operating the rel a se A .115 lease niagnetso thaty `the connecter switch cannot release kuntil 4the' called subscriber.

the Ycalling and ca11ed t..

with each einer.

VIVto magnet 12. After the interval for which it is adjusted slow-to-release relay 5 deenergizes' and at armature 36 removes ground fromv release conductor 22. e' After Vthe line ce Ui i trunk conductor 22.

relayt deenergizes and before slow-to-release relay deenergizes Va circuit is closed for operating the rotary seriesrelay as follows: ground by wayof armature Saand its resting contact, armature 37 and its work- Y ing contact, armature :1l-.O and its resting contact, resting contactfof armatureY l5 and said armature, and winding oi relay 10 to battery. lRelay 10,"upon energizing, at armature removes the ground extending byrway of armature 52v and the lower winding oiv'switchingrelay ll from the release trunlrconductorf22 so that when the release ture 37 and its working contact opens the circuit of thelseries relay l0 andV at armature 37 and its resting contact prepares a circuit for the release magnet l2 which circuit,`however, isropen at armature 33. After the interval. for ywhich it is adjusted 'relay l0 releases and at armature 50 completesthe following circuit for maintaining the connector H` busy until the called man hangs up; ground by way of armature 52, armature 50 and its' resting contact, lower winding-of switching relay lil, resting contact of armature 44 and said armature, 'to release When the called subscriber AV replaces his receiver the circuitV of theback bridge relay 3 is opened at the substationwliereupon said relayv releases. vRelay 3, upon deenergizing,

. at armature 30 opens vthe locking circuits of the `ring cut-oil relay 7 and the switching f relayll whereupon-the latter relays release.' r-I"he,switcliing relay'at armature '54 opens the-circuit of. the ringing-,relay 9, whereupon saidrelay releases. At armatur 33 back'bridge lrelay Vcompletes 'the circuit.

for vthe release magnet Vi12 which thereupon energizes`and restores the switch to normal in the same mannerk Vas previously described.

:RespQll'sive'tothe deenergizati'on of switching relay ll'the circuit for the cut-off relay 7' 6 `lof the lineswitch LS is opened at varmature 52.` whereupon y"said cut-oil`A relayfre- Y leases in the usual manner. All of. theapparatus used inzfestablishing theq'connection is l*now in normal position fand may be usedffor extending other calls.

V'In casethe called subscribenis: the Vfirst `to replace his receiyer'the backf'bridg'e relay 3 would deenergize and the switch Vwould be yheld inoperated position until the calling subscriber hung up whereupon theline and.'

13eme/i release relays would deenergize and complete the circuit for restoring the connecter to normal position.

` Having described my invention, what I v pointed out with, a connecter switch for: connecting'` ith said line through saidgnormal conduc-c. tors, a line switch individual to said line for extending a lconnection therefrom, a

line relay in said line switch normally con-` nected to said normal conductors, a cut-off relay in'said lineswitch adapted when enfvergized to disconnect said line relay from said normal conductors,'a switching relay in said connecter, a ringingre'lay in .said connecter adapted when venergized, to `connect ringing current to said normal Vconductors, means VJfor closing an energizing circuit for said switching and cut-off relays in series, and contacts on said switching relay'for closing an Venergizing circuit for said ringing relay. f

2. ln a connecter switch for use in telephone systems, a ring-cut-off relay, a pair of" line wipers permanently connected to contacts on said ring cut-off relay, a switching relay, a ringing relay, Ymeans forenergi'zing Vsaid Vswitching relay, yand contacts on said switchingrelay for closing an energizing circuit for saidy ringing relay," to

cause' said ringing relay-Y to energize and.

apply ringing currentto said line wipers.

- In a telephone system, means including ioo 'a' two digit vertical rand rotaryconnecterj switch for completing a connection from a callingV to a calledV subscribers'line, means said connecter switch, a relay'in saidcon- 'necter energized responsive to said eXtension, and contacts on said relayk for con- *responsive to Vthe initiation of a call by.a calling subscriber for extendingk his lineto i'io Y trolling theV connection andI disconnection. y

of dial tone to the callingsubscribersiline.`

ing a two-digit ,vertical and rotary connecter switch for completing a connection from 4.' In a telephone'systern, VAmeans includi'i5V a calling to a called subscribers'V line, means responsive to the initiation of acall by aV calling subseriber for extending his line to g .i

said Vconnecter switch,"k axvertical and 'ro tarychange-overy relayA in said yconnecter' switch energized responsive to rvsaid `eXten- 'sion and deenergized .responsiveto the cessation o'ftlie'calling of the 'first-digit of the desirf-idv number, and contacts V0n said relay for connecting anddiscon'necting a' distinctive tone to thecallingr subscribers line.

5. Ina telephonejsystem, artwo-digit'con-r k130 necter switchhaving a directively controlled circuiting said relay repsonsive line, a change-over relay iii said connecter for controlling the change-over from the vertical to the rotary movement, means for kenergizing said relay when the connecter isseized, separate meansl for maintaining said relay energized during the vertical movement after which said relay deenergizes, and means controlled by 'said relay for connecting and disconnecting dial tone to the calling line responsive to the energized and deenergized positions, respectively, of said relay. y c

6.111 a telephone system, a two-digit connecter switch having a directively controlled vertical movement anda directively con@ trolled rotary movement for completing a.

connection from a calling to a called subscribers line, a change-over relay in said connecter for controlling the changeover from the vertical to the rotary movement, an energizing circuit forsaid relay closed responsive to the seizure of said switch, meansv for short-circuiting said relay responsive to the irstvertical movement of said switch, separate means for maintain'- ing said relay energized during the vertical movement after which it deenergizes, and contacts on said relay for connecting dial tone to the calling liney only duringy the time said relay is energized'.

7. 'In a telephone system, va two-digit connecter switch having a directively controlled ing a twomotion automatic switch for exverti'cal movement and a directively controlled rotary movement for completing a connection, a changeover vrelay in said connecter for controlling the change-over froml the vertical to theirotary movement, means for energizing said relay; means for short to the4 rst vertical movement ofthe connecter, and sep- I aiate means for maintaining said relay energized during the vertical movement after which it deen'ergizes.r 'Y

8. Ina telephone system, a two-digit verti cal and rotary connecter switch, a changefV over relay in said switch, off-normal springs in said switch normally l open while the switch is innormal position and closed while the-switch is-inoif-normal position, as energizing circuit for said relay including a winding on said relay,means for-closing said circuit responsive `to f the seizure of. said switch to energize said relay over said winding, means responsive to the iirstV vertical movement of said switchfor operating said off normal springsVY to short circuit said winding, and a second winding on said relay lfor maintaining ksaid relay energized until after the vertical movement.

in said switch normally open while the switch is in normal position and closed while the switch is in olf-normal position, an energizing circuit for said relay including a winding on said relay, means for closing said circuit responsive to seizure of said switch to energize said relay over said winding, means responsive. to the first vertical movement of said switch for. operating said oflj normal springs to short circuit said winding, and means controlled by said relay yfor maintaining itself in energized vposition until after the vertical movement.

10. Inl a telephone system, a two-digit vertical and rotary connecter switch, ay

change-over relay in said switch, meansV forl venergizingy said relay responsive to the seizure of said switch, means for rendering said first means ineffective after the first vertical movementof the switch, and separate means exclusive 'of said first mea-ns for maintaining said relay' energized until after the vertical `movement of the switch.

eol

1l. In a telephone system, a two-digit*` vertical and rotary connecter switch, a change-over relay in said switch having two windings, means for initially energizing said relay over its first winding, means for vrendering said iirst winding ineffective to energize said relay after the rst vertical movement of the switch, and means for subse quently maintaining said relay energized over its second winding` until after the verticalmovement. y

Q12. 1n a telephone system,.means includ-A Y' tending a connection from a calling line, -meaiis responsive to the initiation of a call by a calling subscriber vfor. extending -his line to said switch, and means` in said switch operated responsive to said extension for transmitting a distinctive tone toiiidi'cate rto .the calling subscriber that he may proceed with the 'call and effective upon completion of the first movement ofsaid switch to disvconnect said tone before the second 1iiove-' ment of said switchbegins. n y

In witness whereof, l hereunto subscribe my name thislllth day of September, A. D.,

'CLARENCE E. LOMAX.

' 9. In a' telephone system,` a twosdigit verti-f`v cal and rotary connecter switch, achangef over relay insaid switch, off-,normal springs iio

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