claimed is: 1. In a switch, a plurality of movable ter46 ininal bars arranged in a bank, sets of contacts on said bars, a rotatable brush to cooperat e w th contacts on any selected bar, ineans for actuating said brush, and means for rendering coiltacts on any bar selectable b3T ,t. rotation of said bar otit of normal PO- 50 sitioi-i into a selectable position. 2. In a switch, a plurality of rotatable brush es, an arcuate bank coniprising a pluralit y of tern-iin-,Ll bars common to said brush es for enuagement thereby, means to 55 n-iove aiiy of s,,tid bari out of normal position into a selectq@ble position for engageiiieiit by s,-,id brushos, and me,@tns operated on the eno-,tgeinent of a briish -with t bar to rotate sttid b,,tr so that other brushes Will 60 iiot eligage therewith. rotatable 3 . a switch, i n a plurality of b@,irs -Lrran-ed in an ,trcuate banlc, sets of contac ts on said bars, a plurtlity of rotatable briishe s to co6perate with contacts of ,tny 65 ofsaid bars, means for rotatinly anv one of said ba,rs out of normal positi@ii i@to a select,@t ble position t@o render its contacts select,,tb le, means for rotating said brushes iiito engageinent with selected contacts, and 70 means operable on such engagement for rotating the selected bar to render its contacts nonselectable by aiiother brush. 4. In a switeli for telephone exchanges, a pluralit y of brushes in which lines termi- 75 nate, a plurality of trunk bars arranged in ,tn aretiate bank, terminals on said bars to co6pe rate with said brushes, metns individual to each trtlnk bar for rotating it to reiider its terniinals selectable, means indi- 80 ),idLial to o,,tch brush to rot,,tte it into engagenieiit ivith tern-iinals on -,t selected bar, means opet,,tted upon such engagement to restore said selected bar to noi--mal position, and means responsive to said restoration to pre- 85 select tiiother bqr J'or use. In witness -whereof, we hereunto subscribe our names this 24th day of August, A. D.@ 1917. JOHN NEWBERRY REA YNOLDS. JOHN F. HEARN.

-UNITED S'TA!T,-ES ilA!-)- ,'ENT OFFICE. JOHN NEWBERRY REYNOLDS, OF GRIIIENWIC--,-!, --ONIITECTIO-UT, LND JOHN E. HEARN, oF RASSAIC, NEW JERSEY, ASSIC-.LNOI@',S TO WE@-jT",71',W ELECTRIC COMPANY, INCORFORATED, OF NEW YORK, N. Y@, A CO.RPQRAT-1 ON Or@ NEIV YORI@:, AUTOXATIC SWITCII. Specijlcati-o2i of L-,tters Ilaten'@. Application filed A-Ligiist 29, 7'o cill whon,6 it may conceg@iz,- Be it known that we, Joi-iN NENVBLII@RY PtEYNOLDs ancl Joi-iN FA. HI@IARN, citizens of tlle United Stttes, residino- ,tt Greenwich, in the county of Fairfield a7nd State of Coiinecticut, ana at Passaic, in the couiit of P,,tss,,tic and State of Ne-", Je@rse3,@ respeetively, have invented certtin ne-", tnd tis-3ful Iinproveiiients iii 8--Litoiv-atic Swi-tches, io of which @he folloii,iiio, is ,t full, clear, concise, ,ind exact description. This invention relates to al-itoiiia'u-ic switches for use in telephone exchi,@n-e systew-s, and h,,ts fo@@- its object the provisi-on o-f i5 a line switch of iiew ,iiid improA,ecT struet-Lire. In former line s-witches of the cross-bar type, it has been usual to provide ,t set of terminal bars, arrai-iged ptrallel to each 20 other, and a second set of par,,tllel bars transverse to said first set, each bqr c,,irrying a plurtlity of sets of con'uacts, Olle set on every bar to co6perate -",i'h etch of the transverse bars. Th-Lis @i s-",iteli serltino- to t:l 25 cond.ect, say one 1-iundred subscribers' lines with ten trunk lines, would reqi-iire ojie thous,,tnd sets of tr-Link cont-@cts ,incl oi-@e thousand sets of line contacts, or tnvo tliolis,,tnd sets in all. 30 In accordance with the presei-Lt iiivention, one set of b,,trs is arr,,tngecl in tn ,trcuit-btnl@ ivhile for each trtinsverse bar there is substituted a brush set capable of rotating over the b,,ink and co6peratino@ with con35 tact,,@, on any bar. Thus, iii t s-wi'u-ch of the cap,g.city mentioned, one thousand sets of trunk contacts would still be reqiiired, blit only one hundred sets of lilie cont,,Lcts, or eleven h-Lindred in all. 4o At the same time that the saving in the nuinber of contact sets is effected, nothing is lost in rapidit-Y of opetttion, for me,,tns are pi-ovided whereby tl-ic brush is s-wept over the bar contacts in a contin-Lious mo45 tioii -Lintil the selected coiit,,tet is reachecl. The cont,,tets may be re-,idered select,,tble by a simple rotation of the selected bE-@r, which Nvill swing the ends of the cont,,ict spriilgs into the path of any brush -which 50 may be actuated. As soon as a set of contacis is taken for - Lise, its bar is roteted bick to normal position, rende 'n non-selectable ts on r' gb tho other contact se the ,Lr. The fict th,,it no longitiiclinal mo'vement of -[,be bars Pateiited Apr. 20,19,@@@0. 1917. Scl:ial L70. 198,760. is iiecessary, alloii,-s the use of brushes Of 55 the siiriplest coiist,.@uctioii, such as metal stiiiipiligs. Neither do'the bars themselves require coin.plic,,Lto,-l iiiountip-gs. -Lerence Will iio", be h,,tcl to the accon-ipaiiyiii,),- drtiiiii(-s, IT-i -which Figure 1 shows 60 a 1)1,tll vici@, of siaitch einbodyinly the featiires o' 'his iiiieiition, )vith sucl@'portions o-L' the cireiiit 'uhere--@or as ,ire necess-,try to ,Lii ti ndersttii,-Iinu of its operation; ,tnd -LA'ig. 2 slioivs ,), froiit elov,,,tion of t portion of 65 stieli ,t siii@eli. L' A plurality of truT-il@: bars I tre trrano-ed iii a eire-Lil@ar are tre pivot,,tily mounted, by me,,iiis of pins 5, in t 'rime (not shown). to eqch trunk b,,tr, but insul,-Lted 70 from ef,,ch o4@her, tie coidlicting strips 2, 3 ii-i(I 4, ivhich -L,@,e proi,icled witli iiitegral cont,,tet sl)rings 6, 7 @tn,,l 8, one set of stid spriiig s being providecl to co6perate iiith etch Iiiie brtisl-i in tiie strliettire. At the bot- 75 toiii o' eleli of the strij)s 2, 3 tnd 4 there is I set of I.eriiiin,,Lls 9 to ivhicli the truiik coiiclLictors mty be connected. A lever 10 is ,ilso providecl on each triink b,,tr for settinothe b,,ir. The b,,trs 1 ,tre norm,,illy held 80 in 'position )Arith their springs 6, 7 and 8 pressii ig ,tg@iiiist vertical rods 11 by retract-ile spriTil-S 12. A setting in,.tgnet 13, indivicttitl 'o each b,,Lr, wlien energizec.-,, se-tus its b,,tr by pressure of i.ts trmat-Lire ag,,tinst the 85 lever 10. TI-io b,,,rs tre held in set position by ,l cateli, carried on the ,trmtture of the tril) -h,,,,gne'-s 14, o-Tie of ",Iiieh is proviclecl u for e,,).ch bar. A set ol' oiT-norm,,tl spriiigs, inOLividtial to e,@ch b,,tr is -,trrano-ed so th,,tt 90 the spi-i-ngs 15, 17 ancl' i9, 9-0 w'7@ill be noriially closed, b-Lit, \,vhen the b,,,tr is set, these spri-iigs will be operi 9,nd springs 16, 1 and 15, 18 ",ill be e'losecl. ITetical rod 21, fixecl -,tt the center of 95 the ti-c -@ormect by the ti-utnk b,,trs, carries loose coll,,irs @92, one o'L ivhich is provided for e,,teli s-Libscriber's Iiiie tern-iinatin- in the sw,.teli. Stipported in e,,tch coll,,tr is a set of brlishes 23, 241 25, Nihicli co6perate with ioo triink spriiifys 6, 7 ancl 8, re@p-- ctively, -whell 'U-he bri-ishes ire operated. ELch brush is providecl @Nith t termin,,tl 28 a:or connectioii to the iiicominu lin,-- con(luctors. yoke 29 on eacli collar carries a roller 30 to co6per- 105 qte -wi-th ,trmq,@uure leier 3t of its opertting iiiagiiet 32. These opei@-,,ttjii@y iiiqgiiets 32 are individ-

u@il to iiicoiiiilig lines aiid iiiay be arranged in vertical rows, is sl-iowii. By d'viding then-1 into tiao ro)vs, close spieing of the brtishes . and tri-inli: contacts is at.5 tained. Each oper,,tting iiiagiiet is provided vvith two arm,,itures 33 aiid 34, aiid with two wii-idings, 35 being of lo-", resistaiiec ai-id 36 of liigh resistance. AlTheii tho, wiiidiiig 35 is ener,-izecl. both ai-iiiatui-es 33 ,ti-id 34 ,ire at10 tracted, the arinatiii-e 33 calisiiig it@@, lever 31, t)y eii,)-,-Lgeiiient with i-oller 30, to sweep its brush set iiito eiig,,tcreII)elit witli the first trunk spi@ii-igs wliieh qi-e eiicoliiitered in set positioit. Armattire 904, wheii ,tttracted, 1 5 opens the iioi-mally closed coiitact spriii(,,-, 37 and 38. The enei-(,iz-,ttioii of iviii(Iiiig 36 ivill bold ariiiature 33 if it has been ,tlready attracted, biit will iiot opc,,rate stid ariiiature. This wiiiding lioivever, operate 20 the ariiittiire 34. An ,iuxiliary siv, iteli, haviiig wipers 39 aiid 40, isoper,-ited bv ,i n-i,,Lgiiet 41 to Ldvtnce the iAiper,,3 oiie st@p tipon c,,teli reti-.-tetioli of the ai-mature of the iiia(yliet 41. Tli.G, set 25 Aviper 39 p,,tsses ovit of eiiga@,ei-i-ient with oiie cont,,iot before tl-ie next, whereas test wiper 40 eng,,tges the iiext cont@ict before breakiiig coiitact with the oiie on wliieh it rests. As the coiitact springs 15, 16, 17 and 30 18 ai-e individual to eftch trunk bar, it has been c6iisidor(,cl i-iece,,,sary to sliow onlv a single set, but the circuit tlirou(-h contact t, spring,g 19 and 20 extep-cls iii series tliroiigh such sprid(-s of all triink b@irs, so that it will 35 be closecl onlv iilieii every bar is ii-i iioriiial I)ositi-on, aiicl will be broken @is soon as @ii-iy bar is set for selection. Other @f(,atiti,es of the si),itch N-8,ill be iiiore rea(lil ' v iiii(](.@i,stoo(I froii-i a considei-ati.oi-i of its oper,,-tiioii, wliielt 40 iq , ,is follows: lvhen the ,@i-ibscriber it stibstttioii A i.-eiitov,es h;s receiver froni its liool;@, t is el.ose(I for Iiiie i-el@,ty 42 froii-i grotiiided 1),ttterv, spi-ings 38, right-l-.i,,tiid windiiio- of 45 r(-],Ly 42 throiigh tl-ic subst,,ttioii apparatiis, left-h,.iiid windiiig of relav 41-) iiid -,pi.- ino's 37 to ground. ]Rel,,ty 42, in attrictin-7 it, .irniature, closes a eircliit froji't - rouncl, cont,.tct ancl ariiiattii-c of i-elay 42, t, wiji(Iiiig 35 of in,,tgiiet 32, back contact ind ariyitttlre of pilot relty 43 to b,,ttterl, i,.iid groiiiid. MagTict 32 ,tttracts its arr iii-,ttiires itioving the bri.islies 23, 24 tnd 25 into ongagement with spriTi(,,s 6, and 8, respectively, of a trunk 55 bar which has been set for selectioii. The lill.niature 34, in operatiiio-, opens the eireiii,t of line relay 42, but, ts this relay is slow to i-elease, it maint,,tins the circuit for winding 35 i.intil the brushes bave engaged (,t set of coii60 tact springs. at which time, ,t eirucit is closed froii-i grounded battery, through Nvinding 36, brush 25, contact 8, springs 15 and 18, througli the winding,of the trip iiiagnet 14 of the seizecl trunk bar to ground. 65 -The wiiiding 36 serves to hold the brtislies 1,337,794 iii operated positioii, aild the trip iiitn-ilet 14, iii eiiergizing, allows the tri-inlr, bar to rotate b,,tck to iioriii,,tl position, in whieli its contact spriDgS will be otit of tlle ptth of - mo-,,ement of Iiiie briishe,,, with the exception of those 70 sclze(l. The seized coiitact spriii(rs ire lield iii operated position by a belit over portion 51 tt the en(I of each brusli. It is'to be iindersto6d thtt tlle ivipei-s 39 aiid 40 normally rest on coiltlets of the trunk 75 b,,ti-, wliieh bas been I)i-eselected for iise ivith the next call. As sooii as the ti-ip iiia,,)'iiet 14 li@is operated, all the ti-unk birs will be in iioriii,,il position, so that a eireiiit is closed fi-oili.ground, tlirougli spi-iiigs 19 aii(I 20 Of 80 all the triiiili: bai-s in coiidtictor 44, left-hand ariiiatui-c ajid back cont,,tct of test i-clay 45, wipei- 39, thi,'ouc,rh the i)@indiii,,, of the settlii(,,- i-ii,a(-iiet 13 ol' the 1)reselecte(i tl-tiiik bar to bittei-y aii(I groiiiid. The i)iag- 85 iiet 13 is el-iergized iii this cii-ciiit, tiid sets its truiik b,,ir. A circuit is tlso closed in 1),Lrallel -%vith that jvist traced tliroii,vii tlic@ contact spriii-s 19 aiicl 20 ijid condtictor 44, tlii-oiio,,Ii the wiiiding of pil.ot i-el@ty 4P, to bat- 9,,) t-@ry .iiid grotiiid. The pilot relty, iii attractiiig its ariiiattti,e, preveiits the - opel-ation of any line brushes iintil a ti-unk bar I-ias been set, siiiee the wiiidinas 35 of all the operating iiiagiiets are ii-iiiltiplied to the 95 back contact of relay 43. Wlien the briislies 23 and 24 en age con9 tacts 6 and 7, ',' circuit is coi)il)leted fi-oni I)attery, lower winding of coil 47, tlii-oiigh the )viiiding of the (!,@tlliiig supervi- loo soi,ii-elv-v IC), (,,oiitact 6, I)riish 2il, siil)Iiiie @iii(I siibstatif)ii tpj).tritits, -hrIlSh 24-1, coiittet 7, ttpper iviii(-Iiiig of i-epe@,itilig coil 4@ to -i-oiind. Tli(,@ @,iii)(@i-i,isot-y ti-clay 46 is ol)ej-ate(I ,in(]. pl,,ices (yrolind on 105 condtictor 48, whicli is silbstitute4l for tile (@iretilt tlli@otigli. ti,ip ina(,Ilet 14 -.is soon as the triinli bar liis been i-estored aiid spring-,z 1 5 18 1 ,t @,e [weil opeiie(i ,I ii(I 1 II I I li@tn@e I)eeii closed. The (rround oii condtictoi- @18 also 110 901",'C's is ,t busy test oti the cont,,Icts swept bv test iviper 40. As soon as the preselected trunk bar is set@ it clo.-,es a circuit from ground, through springs 16, 17, its condiietor 48, test wiper 115 40, windina of test relay 45 to battery and ground. Relty 45, in attracting its armatures, closes I circuit from grounded battery, right-liand armature and contact of relay 45, thrgugh the winding of - a4lxiliary 120 switch magnet 41, its armature and baCK contact to ground. N6guet 41 - interrupts its own circuit at its armature and back contact, and steps wiper-s 39 and 40 one step. If the- bar associated with these contacts is 125 in use, ground will be,found on conductor 48@ test,relay 45 will be maintained energized iand another step will be taken. This -operation @continues until an idle - bar,:dw@g--uat@ed@by:absence of-gro-und potential on-con- 130

1,337,794 ductor 48, is fotind, at whieh time the relay 45 retracts its armatures and opens the circuit of magnet 41. The left-hand armature of test rel,,ty 45 prevents the settiiiu of 6 any bar during the travel of the auxiliary switch. At this time one trunk btr is in tise with a call, one bar is set for use in the .next call, aiid a third bar has been preselected for tise with a stibsequent call. The 10 cycle of operations, j-List traced, may be repeated ulitil every trunl@-- bar is in iise, at )i,hich tiine the contintied energization of the pilot relay 4,3 wolild prevent the oper,,ttion of tiiy more brlishes, so that the con15 nections alreftcly set up could not be disturbed. Tn such a c, ,tse -ts this, the auxili,,try s)v,itch wolild continue to rotate until one of the. trlinks was released, at which time it would be set, as describ-Id. 20 At the completion of his conversation, the stibscriber, in replacing his receiver on its switchhook, breaks the circuit traced for supervisory relay 46, thus removiiig grouiid from coiiductor 48 and causinl), de6nero-@iza25 tion of ivinding 36 of the ope@ating m@'gnet 32. Magnet 32 ilow retrtets its armatures Linder the iiifluence of retractile springs, and the removal of the ground from conductor 48 renders the trunk b,,tr, whicl-i was iii use, 30 selectable f or resetting. When the subscriber's line terminals 49 ,ire seized by a connector switch, ground is placed over conductor 50, throuuh the hio-h resista,iiee ivinding 36 to battery and groLind, 35 caiising the oper,,Ltion of ,trmature 34 to break the circuit for line relay 42, so that the line switel-i brushes will not be operated. Althougli we h,,Lve shown the trunk lines as to oj)ei-ators' cord eireliits, it is to 4o be understooa that they might as easily lead to first selector switches in ,t f Lill ttitomatic system. What is