US1541193A - Electrical switching apparatus - Google Patents

Description

BEST AVAILABLE COP.

AJune 9, 1925. 1,541,193

` P. c. SMITH ELECTRICAL SWITCHING APPARATUS Filed Deo. 5, 1922 2 sheets-sheet 1 .N 4%. HQEJQ 911% 111% h mm :55 5 I Q w Q, h d u x N y u N 5 N 4 O0 9 A 9 N 9,. www.

BEST AVAILABLE COP:

June 9, 1.925. l 1,541,193

P. c. SMITH ELECTRICAL SWITCHING APPARATUS Filed Dec. 5, 1922 A 2 sheets-sheet 2 Patented June 9, 1925.

BESTAVAILABLE CoP. 15M lo?, i

:mitm

in the dfjwigiuigvi -is affii'ffrot View of 'gai T;iechmisgn .lxowijig the 'allott-in'g' devie. ,2 is`n' LSlitl `a` 1'fievj( the structure ho'iifn in Fig. 1. Figa 3 is im onlm'grecl tletiil illustrating fthe' nllotfiu'g (levive. Fig. .4 sllows the adaptation of u pluality of alloting devices To sem-'e' lnx-ge' `roup of `tru1\ksor. 'ci1jcuits together with muti-ol circuits for determining 'the openition 'of said dex'ice. Fig. 5 is a diagram'- umtic illustration ofth'e control cir-tuts of tlic nll'ottel's' wherebythe subgroups of euc'li' of :i number of groups of 'trunks etalen fm' use inlotution.

Although the switching device ezulolyinil' this invention svzzppliciible to various uses', it 1 i.\.iti ..1..lm:`l Suited "for ofst-\"l-l'isliin g connections between. incoming circuits or trunks tlie 'seeoud of-whicli Acomprises the three ziontzflfcircuits :mil con'st-ituteu vertinl'row h" df'iiexillejwiie oontats. l'The trunk S, for instance, appear in 'the' ifirst v ei'til Aiow at the left in Fig.v 1 und iS 'providefl'ivitli 5:1' set 'of liei-ble Wire contacts for eacli of the llorizo'ntl'l 'or incoming circuits. The threo- S" flexible-,contacts 7', 8 and '9 :nte secured 'to an insulating lilock 60 Aand 'piojetft 'to n point where 'theirjfree ends cooperate 'with the respective wires 1.2 and 3 of the lioii z ont-:l Circuit.. tacts 10, 11 and 12 representing: the snm-o' trunks '61 are also Secured tothe block (O'an project to @pointu-here they cooperate with the stationarywire'sl., 5 and 6 of the second li'orizonta'l circuit. Similarly. Trunk Gl' iS 95 equipped with nsiua'ny other set-s of flexible contacts as there are horizontal circuit-s in tlie Switoh. The .suine is true of other trunks which are represented 'by other vertical rows."

The flexible Contacts 7, 8 vand 9 project 1"" through diagonal slots 13, 14 und l5 in the operuting'crcl ''u'li'icli is composed 'of iusul-iting uuxjteiiials. The cal'cl G is supporte-tl by menus o'f'a'flexilxle spi-ing 58. one en'fl of which is secured to the block GO :xml the 10" other oud -o which normally rests on the upper conu'ctor 1. Y'itli the spring 5S ijogtiug on the 'conductor l ille flexible condurtors "T, S :in-fl. 9 .repose m the upper edges of the respective dingonuTslots out ci en- 11" The thiee flexible wire cou- 9" lofi gagement..with, the respective' 'stationary wires 1,y 2 and 3. Similarly, the flexible conductors 1 0, 11 and 12 pass through diagonal slots v1 6,I 17?-a1id318'l inthe operating card "575 The card57is supported by the spring 59 which is secured to; the, block 60 with its free end resting -on he upper conductor 4.

Moreover, each of the' outgoing trunks is Provided-with .aluA individualnPratiDg. bals.

three o fwhlieh liars 19, 20 and.`2 1f,areS l 1QWn. The bar ,lgt'is individual tothe jtrunk 61 and is provided .,Wth. .a iexible wire linger for each of. ,the operating cards. I .'Ihe linger isindividual .to the card 56, the linger 27 is individual.,to eard-157., and, similarly, other fingers.. are fprov'ided 1tor v{as many otherv oper- Sula ;.carsi s56;.-5'(.etef f. f

In dition.: tothe vertical operating :bars

T19,I2O,..21,1.,the, switch iszequipped with la numberg ,of horizontal; intersecting bars 22 and23, .The bar 22 is individual to .thel1or i,

zontali c ircuit,1,;2 3, .the bar 23 is individuel to. the second ,horizontal circuit shown, and, f similarly,,othenhorizontal bars (not show n) are individuah to correspondmg =circuits.

The bar'22 is provided with-a plurality of levers 28 9.4.35, etc., onearrangedin proximity toan 'in'sulat ing .cardfrelating to each oftheoutgoing Inlike fashion theselectingy or controlling cards 30, 31, 32, ctc.

These cards are made/of insulating material and Aeach 1s individual to one of the vertical rows of -trunk contacts. The ,card 30, for

. instance, is individual to the vertical row of contacts associated with the vertical bar 19, representingr the trunk (-31. The cards 31 and 32 are in like manner individual to the next twovertical rows of contacts representing the t'wo succeeding trunks. These cards are provided'with largeopenings or windowsl at each point of cooperation between aset o f iexible wire .contacts and a set of stationary 'wire contacts. These windows are of sufficient size to permit the set of flexible contacts to project therethrough as best seen in Fig. 2. The purpose of these selecting card members is to cooperate with the allotting device inthe manner to be described hereinafter to allot atm. sardsiastlierearfeifer this' Particular- Narmallattheshle .fingers 2.6,' 2B

BEST AvlLABLE coP.

the triinlisin af definite order for use. The allotting mechanism shown at the bottom of Figs. l and 2 and in Figs. 3 and 4 Aincludes asegmental plate or table. 33 which is fashioned' to present a series of steps or notches (Fig. 3). The table 33 is supported on brackets 41 and42 which are rigidly attached. to the shaft ,40, which in turn, is supsolenoid when energized draws the shaft 40,-

togetherwitlr-tl'1e supporting 'Stable 33, to the left against thetension ot the spring 99. fhen deenergiz'ed the spring 99 carries the displaced'partsbael; to theinnormal position.. .I n

. A second lsolenoid 52is provided for thc purpose of restoring the supporting table 33 to its normal position'in arotary direction, afterit has ,been advanced to its extreme set position by thespring 99.

Supportingtable 33 is furthcrequipped with a series of pins 37,38, 39, etc., each located, -as-'seen in Fig. 3, at the edge of one of the steps in said table. These pins, which project downwardly, cooperate with levers attached to the vertical operating rods. The rod 19, for example, has the lever 34 extending laterally to a. pointwhere its free end is in proximity to the pin 37. If the table33 is at the proper point in its operation, the pin 37 will encounter the upturned end of the lever 34 when the table 33 is drawn to theleft. However, the pin 37 will not encounter the lever 34 at any other point in the rotation of the supporting table 33. In like manner pins 38 and 39 cooperate with levers 35 and 36 projecting from the respective vertical rods 20 and 21.

The-selecting oards30, 31 and 32 have at their lower ends the projecting portions 53, 54 and 55. lVhen all parts ot' the switch are in normal-position and the supporting table 33 of the allotting device is rotated fully to the left, see Fig. 2, the portions 53, 54 and 55 on the selecting cards escape the upper sui-facce of the table 33 and permit the cards 30, 3l and 32 to fall to their lowermost posit-ion where the upper edges of the windows rest onthe supporting springs 58, 59, etc. The card 32 is seen to be in this position while the other two cards 30 and 31 are shown in their upper positions with the port-ions 53 and 54 resting on the upper surface of the supporting table 33.

Assume thatthc switch is in its normal BEST AVAILABLE COP".

shown); The rod 19 in Jrotating .haelt .earries allfthe remaningrflexible l.lingers 27, etc. tdthei-r-jnoraiiztllpositions, while the :finger 26'Wl1ic'h wasfengnged by theflexe-r :28 is liefld in4 its setpesition,.idue to the 'kf-.shaped .edge of said leven-28. The magnet. 24tfis-iif1ai11-A tained enea-gize'd lendthereby .holds tlieioperatin'g card in 'its .operated .position to maintainthe' established connection'. i The X.'supporti.ng- 'table .33 on. .not ati ng. tor- Ward to pieseflectf the :next idle Atrunk brings tlieisecond''pi-ejccting pin. 38 :form-url to :1 point .where iit coincides .:witli :the upturneal edge ofthe-leyerison the rod 20. .lVlien thes'next callfcomes in and the selenoidfl is 4.ope-rated,` 'fthe table is .drawn 'to :the lcft and' pinS encounters thel lever '35 4to rotate tlic verticaljnd() to .-prep'ar-,e allsets of vcentaets relating'to this particular strunl: Afor operation; .Nextoneof the l'iorizontal bars is operated: and the desired .horizontal .eirf cuit iisA comiected4 tothe second idle o lit/going trunk. Dnrin-gftl-ie foperationo the' :part-s in establishing' Ethe Secondlcbnnection. 4.fthe com'- mon selecting .czird 31 is drawn minut-nity, allowi-ng the table 33 .to escape-forward another step .x'vhere it is stopped .by :the portion 55.011 the thia'elselocting card -Mthongli itlras .beeuexplain'cd ,as an example st-hat. thejhorizontzl'lcircnit 1 2, 3 .is connected to thel lirlstfontgoing trunk, the drawing actually illustrates thisY :horizontal circuit as sbeingiconnectedrto the-.second out going trunk rcpresenzted'liy -t-he -x'ertical -har 20,: i y ,'v

In this manner the trunks are taken for use :insti-ict succession, the ,operation of lthe' .switch inwestablishing a ,connection :to one trnnk causingtheipreselection .of the next trunk Ito handle the next connection. For eac-,li trunk taken-into use the vzrllotting 1device mtates about the shaft 4.0 one step until inally :the lastitr-nnli in the switch is ftaken.

llf'lien -this lhappenstlie supporting table 3.,

having rotated to its ull off-normal position, causes them'niatmfe ll'n'vhielr is rigidly attached to the bracket 41 and is loosely connected at .its iree'eml -toftlielspilidle 45 to depress the Vspillidler-to a'point where `the collar 4G engages the ypiioted lever 48. 'fl-1c lever 4S moves .the switch -arnis 49 and 50 from lthe terminals 101 and 102 to the .terminals 10J-l and 104, respectia'ely. It', at :this time, ground potential again appears on the conductor 100 in case of another :attempt to appropriate oneof the trunks for use, the circuit ot' Solenoid 5l is held open due tothe position o the switch varm 30.

'With the switch in its .alternate posit-ion, a circuit is closed from ground through the arm 49, terminal-104, .winding of the restoring solenoid to battery. The solenoid 52 draws :in its core, which acts on the pin 62, and rotates the allotting device iucluding the eerdsupporting table .'33 back to its normal position. .As the table 33 ro tates backy to its-normal position thej commonselecting 'cards 30,v 3l and 32 drop back one by one to their normal positions in order` that all idle trunks may aga-in be takenfor use in order. 4As the solenoid 52 rotates the shaft 40 to its full normal position, the spinv dle is drawninpwardlyuto a point Where the collar 47 engages the4 lever 48 and moves the switch. arms .49 and 50 back to the-terminals 102 and- 5101, respectively. The` lever 48 has a resilient end the purpose; oit-Which is to -produce a snap `action in the movement ofv the switch ar1ns49 and 50 from the ter'-,

minals r104 and 103 to terminals 102and 101 respectively, ywhen the ,supporting table is returned to :normal and the collar.47l is effectively-engaged with: the lever 48. If the first .selecting card 30' is stillvin an operated position' ywhen the supporting table is returned" to its normal l position and, the sole-v noid 5,2 is then ;deenergized, the supporting table `will rotate under the :tensionof spring' series is taken for usc in the manner ex- Plilllledlfv 'CIV i :v f.

Should any one vofthe trunks,after have ing been'e'ngaged, become idle during the time the common selecting card relating to such trunk 1s above .the surface of the table 33such-trunkfca-nnot again be take-n for use unless-.all succeeding trunks that ,are idle have been used andthe device restored to its normal position. Should certain of the trunks, taken into use during the operation ofthe allotting device, remain busy after the last trunkhad beenfappropriated, the' restoration or theallotting. device does not interfere with thebusyitrunks. The common selecting cards are merely held in their uppermost ,positions by the y supporting springs of the individual operating cards.

Any suitable circuit arrangement Whereby the initiation of a call places a potential on the .usual start conductor 100 and Wherel v the selection, of the proper one ofthe horizontal operating magnets 24, 25, etc. is eir'ected, may be employed with a switch of thisv character. Reference is made, for example. tothe British patent to Testern Electric Company, Limited, No. 183,438 of 1923Which shows one manner of bringing about the closure of the starting circuit and of completing circuits for the horizontal operating magnets of the switch.

BEST AVAILABLE COP.

Fig..4 4shows the invention applied lto a switch rof, largel capacity Where a number of trunks or circuits which it is desired to The siZe accommodates the :group of'ycards 82 Whilel the table 7 2 serves the last group ot' cards S3. The operating solenoids 76, 77 and 78 areoperatedin succession by the extension of the start Wi're 100 through contacts operated bythe shafts 7, tively. .y

g Referring 74 and 75, respecg particularly to Fig'. 5 the trunks of the groups S1, 82 and 83 are divided into subgroups, there being three sungroups for each of these main groups. By meansof the circuit 1arrangement shown the trunks of the lirstjsubgroup in the Vgroup l81 may be taken for use fin strict rotation', whereat'ter thestarting-circuit 1s extendedv to the second main group 82'aud determines `that the trunks of the first'subgroup of this second main group shall next he taken for use. After all `these trunkshave been used the starter circuitis extended and the trunksv of the first subgroup of the third main group 83 are taken for use in order. Thereafter, the start circuit is extended back to the first main group 81 and the trunks of the second subgroup are taken for use. Next,

the trunks ot the second subgroup or thel second group aretaken and, thereafter, the trunks of the second subgroup of the third main group arev taken for use. Lastly, thel third' subgroup of trunks in cach ot' the three main groups lare taken for use in the respective order.

Vith the allotting mechanisms in their normal positions the'closing of starting con-4 ductor 100V completes a circuit through spring106 and its lower contact, winding otsolenoid 76 to battery. In the manner described the solenoid 7G causes 4the connection to be made to the first trunk and the individual selecting card. 107 is elevated. After all of the trunks in the first subgroup have been taken for use the card 84. which is elevated when the last trunk is taken, permits the spring 106 to close its alternate contact.' On the next call the start Wire 100 is extended over the alternate contact of spring 106, spring 10S and its normal contact, winding ol `solenoid 77 to battery. In .like manner the solenoid 7 7 may loo be operated afnumherof times until ,all

groer S2.. are taken teriuse: 'When the last trunk in"th '1 sjs' ubgro`fup is'appropriat'ed, the

'thefstartiiiire IOOo'ver the alternate 'contacts the o j 'By' inspection of the circuits it i ivill 'be Anoted' that subsejq u'eut :calls will fea-use [the standings@ 'cresson-18210 be when f 'or 'use,fl't hereavfter,the 'second subgroup' of the third:A group Sfthen the third f"subg1011p5-0i1eacltofthe three grcupspS, 82 and When the ,last trunkinltheflast'lsubgroup lotstitotfe-srrinlsi111'fendeffit cur isfcornpletedffroln ground through this s pring `anf1'tl 1`ence in .parallel through' the windings. of solenoidsii, andSlftoba'tter'y.' Solenoids 79, 80 and 81 operatein the manner explained to restore tl1e"'allot ting'devics'g'ofl "and 72 to their normal positions.E i

1"Gh.`i,le .t.l 1e.horizoaltalcircuits 1.9, 3 and4 4, 5. 6l etcfarc spokcnot as incoming circuits for the purpose of distinction it is plain that the circuits ma1 constitute link circuits for interconnecting incoming lines or incoming trunks to the outgoing trunks 1llustrated in the switch. The manner in which these horizontal circuits are employed as links is disclosed anddescribed in the above mentioned BritislrPatent 183,438 of 199.3.

That `is claimed is:

l. In combination, incoming circuits. outgoing circuits. separatelyv movable contacts for effecting connection therebetween, a eoutrolling member for each outgoing circuit, operating means for moving said contacts, means within said operating means for actuating each controlling member when the corresponding outgoing circuit is taken for use, and means associated with said members for allotting in definite order the outgoing circuits for use.

2. In combination, incoming circuits, out

th Spring 10.8 to .ns-

'ting the outgoing eireuitsvtor uselinadeti- 'sion.

BEST AvArLABLE cop: s

going'circ'nits, 'separately mov-able contacts for effecting connection between the incoming and outgoingcircuits-a'controlling eleient for `each foutgoing' circuit-,- means for 'operating said contacts, meanscontrolled'by said operating meansforaetuating 'eaehxeontrolling element 'when' the j corresponding outgoing circuit is taken for use, and means controlled jointly Iby said' elementsv torf allot'- nite'order." v

4'3.' In combination', a number ot'- circuits, 'separately movable contacts for effecting connection with said circuits, a control'ting member: for' veach `circuit,-'opeating lmeans for moving said contacts,meanscontrolled by said operating meansffor actuating each controlling 'me-mber simultaneously" with vthe operation iet' a i contact-'set when- 'the corre spending' lcircuit is takeno e A'and' anca-nis controlled b'y said members' or" allotting lsaid cireuitsfor useinorder.' 'j 1 et'. Ineinbinatiom'f a' number"'otlcircuits s'epairate'lyv movable' l contacts 'or' 2effecting connection ith-'said' circuits, fa movable card for each circuit, operating meanstoumo-ving said contacts,- mea'ns controlledbysaid op'erating'means to actuate each-card when the corresponding-circuit is-'taken-fo-r use, and means controlled by said morable'eards for ailotting the circuitstor use-in Vsucces- 5. In ccmbination;A a number of circuits each having a 'pluralityl ofconta'ct setsjoper# ating mea-ns for opeiatillig Lany contact' set. to make connection with the Corresp(mdingr circuit, a 'siilalile controlling mem-ber for each circuit-and common to allA cont-art sets thereof, inca-ns controlled by said operating means'lor actuating each'controlling meinber when any set of contacts to which such member cominon isoperatt-dL and means controlled by' said members for allotting Said circuitstor use.

In combination, a number ot circuits each having a plurality ot Contact sets, operating bars for actuating said Contact sets to make connection with said circuits, a slid able controlling member for each circuit'aud common to all contact sets thereof, means associated with said contact sets and operated by one of said bars for actuating each controlling member when any set oi contacts to which such member is common is operated. and means controlled by said mcmlgiers tor allott'iug said circuits for use.

7. In combination. a number ot circuits each having a plurality of Contact sets, operating bars for separately actuating any contact set to make connection with the corresponding circuit, a. slidable controlling card for each circuit common to all Contact sets thereof, means associated with said contact sets and operated by one ot Said bars for actuating each card When'xany set of contacts to which such 'card is common isoperf ated and' meanscontrolled by theslidable cards forallotting said circuits.

Y 8. In combination, a number of circuits each having a plurality of contact sets, operating bars for separately actuating any` contactset to make connection with the corresponding circuit, a slidable Controlling card for each circuit common toa-l1 contact sets thereof, a flexible -element'associated with each of said contact sets and operated by one of saidbars for actuating each: card when any -set 0 1c contacts to which said card is common is operated and a mechanical ale lotting device cooperating'with said cards to allot the circuits for-use in succession.

9. In combinatiom'a number of circuits each having a pluralityof contact sets, operating means Afor operating any contact set to make connection ,with the corresponding circuit, a' controlling. member ,for each vcircuit and common to all contact sets thereof, means associated with said co-ntact sets and actuated by'said operating means toeffectivelyfmove each :cont-rolling member when any set of contacts to which such member is common is operated, and aZplurality of mechanical allotting devices jcooperating \\vith. said members to'allot said-circuits for use in a desired order. y

Y 10.111 combination, a number. of circuits arranged in groups, contact sets for making BEST AvAiLAsLE coe* nection itherggwith, coppe ating 'switch 'bars for actuating said `contact sets, 'a .controlling cardindividualto :ea'clrltrunk and common to all contact lseits thereof,A an element for displacing.eachg'card ivlien any set ofvco'nf tacts *tov which :such card .risicommon is operatedby. oneof ,said bars, and a lmechanical allotting ldevice cooperating' Awith lsaid cards to determine,-tlieorder'inl which said trunks are takenlgfor use; ,Y l i, l, V'13."llhe ycoinbination in a switching device ofua series .oftrunks eachhaving vcontacts for makingv connection therewith, means .for operatingI said contacts, controlling members one for each ,of said 'trunks,`;a resilient4 bar Within said `operating means for actuating each controllingf memberfwhen the correspondingftrunk is taken lfor use, means controlled by vveach ofsaid controlling members for allotting the next idle trunk ot: the series for us e meanscontrolledby said allotting meansz for-locking said cont-rolling members intheir operated'positions, and means effective when thelast of said series of trunks is takenl for use for restoring said allotting means and for yunlocking suchy of said controlling members, as correspond to idle trunks.V fn

In witness whereof, I hereunto subscribe my name this lst day of December,

a.-n.1922. l Pianoro. SMITH

Images