claim is: 1. The combination 6f a frame; a arriage@. 4'5 c ii-ioa,ably supported by said rame; a worm sl-iift f6r reciproc,,tti-lig-said carriage; a conr tinliously driven illelmbe ; power traiismittiii(-,- il'l,-Chaiiism throtigh which said continuotisly clrivc-ii incinber oper,,ites stiid ivorin 80 silaft, said mc@,chan; si-ii being adj ustable to revoi-@,,,e ' li.e cli.recti.or. of rotatioil of s-,tid worm a control mciiiber for S,,ti,.l meelianisiii tlial i,@ P(,@ri-odically ,idjtisted al opT)osi',,(, clirectiol'is in timed rela,tiol-i with, 55 tIL-,e iiiovemeiits o-L' sa,id carriage to c,,i-Lise szilid 1)owei.- tr,@,iisiiaittiiig @iiecliarism to i-otatc@ said @voriii sb,,tf-L, ,tltei.-iiately iii 6pposite diree,t p.),ir o.@ 1,,i'che T-0 L! s - r positively loel,:ing so-"d i-,Giioclicalls- d s a it, ted coitroli-riember iii 0 I'@@s tion duiring the iiiter,-@,111 of '@l;iiie b(,tNN!eoii adj Li,,;tments thereof and meaiistlii,oligh Nvli;.ch said c,,trriage controls and I)os4.tively opera'ues gti d lttehes ii-i ,ilterlia@t-,ion. 2. A,-i i rtieclianilsji-i of th6 chi,racter cle-, 05 scribe@t, coiiibiiia-'t-,-',On of a eyliiidricallys-f@ira@l a slide -elemeii-L' movably W-Lthin said cyliiidrically-sp,.raliiici-al)er and reciproe@ted longitudinally tliei,eby- aiid iillealls for rot,,ttiiig oiie of stid !OG i-ii,,:@inbers alterpat-,Iy in opposite di-rectioiis wliilp the other oT said mejyibers is held fo,aiiist i@otat,ioi-i, tliereby 'uo cause said CyIiiidi-ic,-.Ily spir@tl inen-ibei,.to reciprocate said slide -LIemeiiL@. 0. A iiaechaiiism o'L tlie. char-,@ eter clescribed, (@OiAlpris@ng a cylin(ir',eally-spiral member; a @iibulai, iiic,,mbc,@r withi-.i said cylindrically- - spiral. -niber su-pi)oiting the convoltitions of tli@ lq,tter ,ti-id mlltde at one s'lde thereof witli q loi-igittid-inal slot; ,t carriao,e comprisill(, ,t c.@lindrl'cal p,)r@-ioii slidably@li' d witlit, ute iii said slott-ed tul)uiar ii-i(,@mberi.'nd made ivitli t 'at,,r, ioii prol , I - 1,11. (@xtens ecting througli the @,,Iot o-.r' said t,,ibultr member @ai-id Lli.rou',Yh tl-ie 115 space betwee-n tv,7o adjacent convolutioiis of -,aid cyliiidric,,tllv-spiral n-ieniber, and ineans f or co'ntinuill y rotating o,.ie of said two mei'llbers alterna'ely iii oppos'te direct-; oi-is ti@lereb3T 'Co 1'--Cipi.-o,,-ate said ctrriage. 120 4. IV mech,,tnisni of the eb.,q,racter - desci@i-bed, havin(I ill conabination a eyliiidrically-spiral t, iiiember; a tubular meiiiber wi-tl-iin and ,3upi)ortin,,, sa'@cl cylindricallv-si)ir,@l mer-,i@.,er r,,i.,tcle at one si-de thereof with longitudin,,tl- 12,i si.ot; meiiis for rotating one of said mei-nberq alte@,iiatel-y in opposite dir,ections ivhile the other of said mombers is held stationary; and ,t slicle element movably i-@io-Linted within said slotted tubular meiliber and re ciprocated

1,917,200 Ion-itudin,,tlly thereof by said cylindricallyspiral member. 5. The combiliption of a cai,riao'e, reversible driving mechtnisil'i f or reciprocating said c,,trriage- a contr6l member for sild mechanism that is acliustable to reverse th,dire-,tion of -n-iovei-i-ient Iiiilparted to said carriage by said driving mechanisi-i-i,- @ of opposed spi@ings throvigh which said carriage L@ acts to adjust said control member; a p,,tir of opposed mov,,tbly stipported ibtitii-i@ent latches for positively lioldin- said control mciiiber ,tgaii-ist operation by said sprin,-s, and iiie,,ins tlirough ivhich said carriao;e coii-, trols a-,id positively operates said latches to cliluse said spi-liags to adjust said cohtrol itiember alternately in opposite directions in timed relatioii with the movements of said carriage thereby to cause said driving n-ieehanism to continliously reciprocate s,-tld carr,,tio'e. 6. A mechanism of the character described, comprising a fixed cylindricltllyspiral iiieiiiber; ,t tubul,,tr member within said cylindrically-spiral ii-ieiiiber made at one side tl-iereof 'th a longitudinal slot; inetns for rotating said slotted tub-Lilar meniber alternately in opposite directions, and a carriagecon-iprisiii(y a cylindricil portion slidably fitted within said slotted tubtilar men-iber and macle v@ith a pair of lateral extensions projectiiig radially through the slot of said tubular member and tlirough sp,,tees between convoll-itions of s,,tid fixed cylindricallv-spiral member, said carriage also comprisina an apertured slidably supported noii-rotatable portion sliri-otindino- said cylindrically-spiral member between said late@,11 extensions. Ifo T. A mechanism of the character described, 45 50 r)5 do 65 having in combination a: frame ineluding a tubul section formed with ,t straight longial7 tlidinal slot; a tubular el6sure sleeve telescopically tnd rot-,Ltably associated with said seetion and made with a loiigitudinal spiral 70 slot which crosses the sl6t of s,,tid section; a @carriage -vvithin sai-d tubular section and sl,-,eve movable bqck ancl forth longitudinally thereof and made: Avith a, lateral extension slots at projecting throtigh both of said the 75 place iihere they cross; and meains for reciprocatii-ig said carri,,tge leiigthwise of said tiibiil.ar fraiiie section and closure sleeve. S. A m.echi,nism of the ebaracter described, so h,,tvino- in coinbiiiation t frame includino, a ttibular section forn-ied with a straight lot@gittidinal slot; t tubul,,ir elosure sleeve telescopically and rotatt'bly fitted upon the exterior of said section and made with a lonoitudinal spiral slot which crosses the slot of said section; a carriage within saicl tubular section and sleeve movable back and forth longiti-idinally thereof ancl made with a lateral extension projectin- through both of said slots iei-e they cross; and me,,tns tt the place ",I for 90 rec'procating said carriage. 9. A mechanism of the character described, having in coi-nbination a carriage; revolvable lielically coiled ivire member for recip05 roc,,iting said ctrriage; means for rotatina said wire inember alternately in opposite directions therebv to i-eciprocate said carriage, and stipporting means for saicl helically coiled wire meiiiber thtt is telescopically as100 sociated witl-i the latter so as to hold its convolutions in axiftl alinement. Signed mv me at Boston, Suffolk County, Massachuse@ts, this Ist day of Auo-tist, 1929. JOSEPH BORNSTEIN. 105 lio 115 120 125 130

Patented July 4, 1933 l @ 9 1 7 , 2 0 0 UNITED STATES PATENT OFFICE BORNSTEIN, OF BOSTON, MASSACH-USFTTS, ASSIGNOR TO LO'UIS BORNSTEIN, OF QUINCY, MASSACIIUSETTS WIPER MECHANISM FOR WINDSHIELDS AND T'@TIE LIKE Application filed August 6, l@929. Serial No. 383,865. My invention relates to -vviper or cleaning inechanisn-is for windshields and the like and it has for its object to im rove tl-ie constrlicp tio,ii of devices of this clftss. 5 The present iiivention has to do moi@e pai-ticlilar ly with wiper n-iechanisn-is of that class. coiilpi-isino- a sere-Nv shaft that is alternt'Llely rot,ited in o p?site directions to reci p pr6eaCe the wiper carriage or c,,trriages thereby to 10 inove the wiper or wipers, bacl@. ,tnd forth across the ivindshield or window. Mechanisms of this type are sometiihes made with reverslug gearing that is atitoii:iat;ically adjlistp_d by the wiper carriage at ii the end of eacli stroke tl-iereof to reverse ti-ie clirectioi-i of rotation of the screw shaft, aD.d a ioature of my present invention consists i-.i pi-ovidii-i(y a drive for 4Lhe screw shaft incluclin(,Y two @ppositely driven continuously ro23 ,tating ilieiiibers @vitli ivhich is a ssociated ,t clutch meii:iber that is col-iiiected ivith thc@, screw shaft tnd tdj ustable so as to be eiigaged with either one or ihe other of said u-ieliibers, novel means being provided througli 25 i-vb,ich slid clutch inember is ,tutoiiiatictlly controlled and opei-ated to catise,said oppositely driveii menibers,to alternately drive the sh,Lft,in opposite directions thereby to reciproc,,tte,ilie wiper or wipers. "3 -tvnother f eat-Lire of n-iy iiiventioii consists in constructing tl-ie screw shaft as a, he'Lically coiled sti-ip, ribbon or band of metal suppo,r.ted interiol@ly at separated intei-vtis throu(yl-ioi-it its len tli against lateral flexing 9 by a rod f orming part of the fraine of the device@ Practic,,illy all iviper mechanisms o.f the class ref erred to ,Lre constrtic@ued with a, f rame i-.icltidin- a ttibular hou@i for the screw, t' 11.9 that is formed -"Tith a longitlidinal s'lol@through which the wiper carriage extencls froin the screw to the exterior of s,,tid liousi,-ig. One great disadvaiit,,tge to the constrtictions heretofore proposed has been thtt,cltist, 15 &incl, o-rit aiid other matter Nyould find its way t@firoLiuh said slot into tl-ic housing ,tnd loclge Lipon the screw shaft, alid upon the be,triiig stirf aces of relatively n-iovable 1),,trt.s, resillti@ undlie wear thereof:and re-ider50 ii-i@y the @lenvice noisy,,in operation ti-id also noisy because of. relttive vibratory inovenlelits of its ptrts. Therefore, as . aiiother feature, Of 11-ly pi-esent ir@ve-.ition, I li,,Ive provided t liousiiio- for the screw shaft wlaich qpproxiinately, coiiipletely incloses tl-ie lttte@ 55 so that it has -,io Opell 10'lglitllClilltl Slot as heretofore and consequently dtist, dirt, sa-,.7,d I I . aiid the l-ke, is e:Lcluded f -om eiitei-iii@ol- said housing. Ip- the besr. f oi-iii cf ii:iy 1,-ive-,itioii the l@olls- 60 ing for the sei-eiv coinpr@.s6s an iniier fixed -'L 'Llbulir sectioi-i 'LIiat is Oxteriorly eirctilar iii cross-see'LioiL foriiied with the tisiial 'i straiglit loiigittidiii -L sio'u-, tnd aii outer eiretilar tublilar sectioil tlial@- is loose',y aiid ro- 65 tatably 1_1_iotii-ited ui)oii aiid stirrotiiids the ri 11 0 Li a "xed see-i ii. This ou'er tub I r section is T,)rn-ied ivitli a longitudiii,)! siiral slot of. coriapai--,itively steep pitch aiid at tl-ie poin-t whei-e this slot crosses tlle sti@-,Li,,).Ilt slot ol 70 LI -'Lhe iniier fixeo, se-,-@iola there is, o-@L-' course, an opening. The ivipei, carriago, exterds from the screw throtigh tliis ol,)eiiiiig to Itlie exterioi- of the housiiao- where it is provided with the ustial glass--Ingagii-ig wipe@,-, aild 75 as said carriaoe 4 S 11, ve-,l back ai-id forth by t, I 0 the screw shqft the ou-'Ler 'L-ub-Li",Lr section or sleeve is oscil',Iiteci blit sil-ice its slot is s ii-al p and 'uhe slot of the iialier fixed sec'uion is straigli @l., it ivill be clear tila--',.t'he holising 80 @vill be iii-ftintained closed at a'L'L t'liiies because the tavo slots cannot it aiiy time ]De. bro Light into regisl-ei- 'Llii@oughotit their lelo@@Lhs. Otl -.ter fqatures of my inieiitioii,ai,e iiereiiitf7ter pointed out. 85 In the accoiiipan,)7ing draiiings: Figu re I is ,t f-roiit elevation of a portioli of a wind-sliiellci havir@,-, ,Lpplied tliereto t wipei. or cleaner iiiechaiiism constructed ih accord iiiee with my inveii@-@.on, said mocha- 90 I_Iislll being sli own i-iiosti.y iii. section. 'Figu re 2 is a secti-oii on line 2-2 of Fig. 1. @Fi( yure 'o is a secti6n oii line 3-3 of Fig. 1. Figiii ,e 4 is a seetioi-i.011 li.,ie 4-4 o-L' Fio-. 1. Fio,ti re 5 is, a @,,ection,,il dettil illustrating 95 anothe r form 6f ivi-per carriage. Figti re @ 6 is ,t section oii Iii-ic 6-6 6f Fig. 5. Fi"tir e 7 is, a cross-sectional det,,iil illustratin(,, a third f6i.1-n of iviper carri,,lo,e. Figtire 8 is a section on line 8-8 of ri ig. 7. @oo

1,917,200 Figure 9 is a froiit elevation of a portion of a wind-shield having applied tliereto a wiper or e'Leaiier mechanism constructed in accordance witli 1-ny ii-iventioii but illustrating other fe@ittires thereof, said mechaiiisni beiiit)@ shown mos'Lly in central lol'lgitudinal seetion. Figure 1 0 is an elevation, on redticed scale, of the closure tube hereinafter. clescribed. 10 Iligure 11 is a section on line 11-11 of Fig. 9. Figure 12 is a section oii line 19,-12 of Fig. 9 ' Figute 13 is ,t sectioii on linc, 13-13 of @-5 Figs. 9 and 11. Figure 14 illustrates anotl-ler form of wiper mechanism. In the form of my inventioil illustrated in Figs. I to 4, inclusive, the main '@rpme of 2 0 the inechanism comprises two, eiid sections 15 alid 16 ard an intermediate tubullar section 171 the opposite ends of the latter being fitl,ec[ 'u-elescopically u o-,i bosses IS: pi-ovicl6d p on the end sectioiis 15 and 16 to which saicl 25 ends are rigidly f astened. . The end seeLiOn 15 is made in the -t'orm of a. box or housing for enclosing tl-irce intermeshii-ig beveled gears 18, 19 and 20, aiicl is provided with an apertured leg 21 lastenecl 'O by bolts 22 to tl-ie top c oss-btr of the frame r 23 of the windshield. The opposite e,-@id seetioii 16 is also inade with an apertured leg 24 fastened by boll-s 25 to one of the upri@,,ht -w iidshield fraiiie. side b,,trs of the i 13 5 'vvithin tlae in'ern-iediate tub-,i,lar frame section 17 is ,i loiigittidi-.naily clisposed rocl ,or bar 26 having one end tltereoi' fixed wit-hin a soelk@et providecl in the end section 16. Froin eiid secti.on 16'tlie rod or bar 26 ex'@leiids 40 tl-iroiigh the tubultr intermediate see@ ion 17 a,-id the bo,- ,-Iike end section 15 to the outei, z@5 ide wall of the latter where its opposite end is fasteiied wi;'hiii a socl@et provided in seid side wall. Thus the rod or bar 26 serves as 9, tie-rod to assist in holdin-,-, the three 1-nain arts or sections of the fr,,ime in assembled p relationship. Witl-iin the interinediate tubulir fram6,,3eetion 17, and loosely motinted tip6n the rod or 6'0 bar 26 is a screw-shaft section 2T cop-sistinu of t ine'u-al biid or bar formed into helix where6f one end is fast ned to one eiict of a e sle,eve 28 whose opposite end abiits the ellcl 1,5 section 16. At its opposite end the screin, shaf'u sectiola 2( is f astened to one encl of, a sleeve 29 ivhich extencls throl-i_gli the ,idj,-L,-ent side w,,tll 30 of the, eiid sectioii 15 into@ tlie latter wber6 the t-v@,o beveled gears 19 20 are loosely mounted upon it. C,-@' Splined iipon the sleeite 29 in ,t position bet,ween the two gears 19 aiid 20 is a clitteli meniber 31 c@trrying stiicls 6r pins 32 tipoit it@, opposite sides @o co-operate with studs,@0)3 projectino- from the beveled ge,,trs 19 and 20. Fastened by screws to the uncler sides of the frame sections 15 and 17 is a housino- 34 within ivhich is a shipper iiieluber 35 forme-,l ivj-'Lth a slot 36 tl-irougl-i whicli ex'uend two,pilis 37 by Nihich the said shipper in.eiiber is glidably slipported so ts to be i-iiovab'te iii a clii-ee- 'To tio,ii parallel vjith the axi.s of slecve 29. Sliipper i-aember 35 is n-iade at one enO, with an upivardly extendi-.ig yoke 88 embraci 11 clutch iaieiiiber 31 tncl carrying rolls 39 occupytng a eirei-iipferential groove 40 'L6i@ill,,,d !5 in the clutch member 31. Als.o, the shipper i-nember 35 is m,ade Nvil@h a-ii upwarclly extending arm 41 Nvhose upper enct portion oce-Li.pies a positio.-ii between th(, ds of a pair of ax,@al'Ay tlinecl co-'Lled 80 iniier en spriiigs 42 Nvhich ablit at their outer cncls against a pair o-T i-Ligs or ariiis 43 ex'ucndiiig downivardly froill t slide bar 44 ii-iouilted withliatliettlbtilarinteriiiecliate'rai-io c tioii I s c 1.7 aild movable longituclinallit therc- I Of. 'ilho 85 botuom ol section 17 is n-iade -@vicl-i a -,lot 4,I) tlirougli -v@Iiieh the Itio-s 43 exc.iid clowiiia-ardly into the hotisi@g 34 10 0-ii(--fio-e the, outei, ends of the spriiigs 42 ilso '@-0 COopera,te ivith a pair of opposed !,,ttche8 46 and 47 pivot,,illy connected ftt 4S lvvith housino34. The latelies 47 tii'e -yic@ldidgly UrZeCl tOWPrci thei,r operati-@e I)OSi,rllolAs a@,rai@ist s@tops; 49 by lig ht springs 50. 5 At its opposite eiads the slide bar 4z[ is ii'lacle Ivilith tl,,Dstanding ari-as 51 ind 52, respectively, to co-operlt'ue wltll tlle wi-I)er cirriage I 53 that is iii6vablv s@up 6rted ivitb'ii lrcl p o-Lii0@ed by, the inter'n-iedi,,Lte frame section 17. I.Flis 7viper carrie (ye is -L block of iii,-,tal. iipon its exterior w-ith slialloiv pockc-ts wit!-iiii, ivl-iieli are seat-,d aiiti-f I riction bolls 54 wliieli iide ao-aiiist:tlie inrcr sicle-secti-oii IT Car-riag,@ 53 Is macl,,@ wltl-i aii cxteiision 5,5 projectincy O!Lt tliroi[,)-h '@lot 56 foriiie@'L lollaitudinally in the rear",all of sec,'.ion 17. " To the outer end of the extensioii 55 is f aste-necl the st(!in 5@ of a iviper or qqueegee, @.,8 thtil is fitted, as usual, againstthe <- -lass 95 of th(,, wind-sl@iel(I As sho @vii in Fig. 2 tl-ie 'beveled @,ear 18 is f ast on the inner end o:f a spindle 60 jour-Tialed in a bearing pr("Vid(ld in the froll,u @,till 61 of the frti-iie section 15, and tt its oiiter end spindle 60 is couplod to oiie end of' a coiitintiOUSI . Sli ft )T rotated flexil)lll a 62 c6nnected witli any conveiiient s6urce of po-vver. The o'ear IS rotfites in a directioii to di,ive t,lie tv@o@'gears 19 and 20 in opposito clireecionr, "Is indicated by tl-ie@ ar@ows in Fig. I aiid therefore when clutch mernber 31 is interloel-ced with (year 19 the screw @haft-see'Llon 2( iai'll be driven in one direction ,tnd ivlieii intei,loelked witl-i gear 20 said screw sh,,tftsectioii ivill be drive'n iii the opposite direction. The -wiper c . o . a arria,;e 53 carres stiid 63 tltat cectipies a positio-Ti between two ad]'acent convollitions of sl-taft.sec'U'16n 27 and it ivill -tl-terefore be clear tl-iat when the screi7v sh,,tft is, !"'O

1,,917,.2,00 ,r.o.tated in eit.1).er directioii bl-ie,cLrriag-e, @53 is moved lenuthnvise 6f sectioh 17. z' Thus wheii tlie,cl@,itch ii--ien-iber.3l.oceii,pies Ll,,e position shonvn in Filol-. I @.the screw s.@Ijaft 5is iii t dircetion I.-o propel carriqge 63 .'UoAi,,tr(I the right and as -s,,tid,,carria-e ilc@ai@s the Iiiiiitof its iiioveiiient iii this directioi-. it eiigages the ai-m 52 and moves slide 'oai- 44 end-Nvis(,, with it. - At this tii-iie the 10 1,,itch 4'@ is in pos-Ltion to lock the shipper illeiiibei@ 35 a(,ailist movenielit tonvl)lrd the right witli the result that tl-ie sprino, at the t, @ie-f-t of trii-i 41 (Fio-. 1) is colii ressecl -tint-,il zl@ p ti) e lu o- 4@' Lt. @t'i e opposite side of ari,.a 41 trips ,i5 the -,vu'eh 47 ivhei-,,,upon tlle c6iiipi-essed s,prino, 42 .,Llii@ows the sliil)per rii.eiiiber 'U-oivard the riglit thereby trtnsfe rrin g tl-ie :el-LLteh 1,.ien-ibei- to gear 20 iiid 1-,erinittiiig tl-ic lat6b 46 to iiiove down iiito its opei-.tti-N,e I)osition 20 so as to loelc [lie shil)per ii-i positioii tt ',@lie, 'iiiiiit of its ii-ioveiiei-it toit@,ard the i-igbt. eiiibei- 31@ is th @VVhe-n the clutch iii lis ell,o@aued -@vitli ge@-,r 20 the directioii 6f rotttio,,i @ n of ,;htft-secti6ii 27 -is reversed and cirriage 25 53 is r@ioved btek t6wLrcl 'the left. j-@s @it nc-,ars the 1-imit of its inovei-nent ill this direetion it eno",t-.eg the upstandiiig -,rm 51. of L@ tn slide 44 ,tnd cti-ries the latter ivith it thus coiripressill@-Y the spring 42 it tl-ie right of 30 ,!rill 41 iintil tl-Le lu- 43 at the opposite side of ai-i-,i @l I trips 1,,,teh 4(i -vvlieretil--.6n the coillpi.essed sl)riiio; 42 tlirows the sliipper 35 to the Iii-iiit of its iiiovement t6Nvard the ;'Left where it is caught and locked by 1,,tteh 47 35 thereby ti-ans'lerrina tlle eltiteh iiien-iber 131 to the geai@ 19 ,tnd ig,,@iii reversi.,ig tlie dii-ce'Lion of i-iioveiiienl of sh,,tit-section; 27 ,tnd carri,,tge 53. In this way the c,,irriage 53 and wiper 58 dO are c oiitiiiiioiisly,recipi-oeated back ajid forth across the iviiid-shiel.d. It is ti 'Leature of- the s'Llructure illustrated in F4 i!,Ys. I to 4, iiielusive, that the rod oi- b,,tr is iiiacle at separated intervals tl4rotigliout@ 1 45 the portion 'uhereof that is enclos,-d bv sliftftsecti6n 27, ivith sho@t isol,,tted bearino- enI.ar@,,o.neD.ts whereby frieti6irl is redu@,,d 'to the iiiii-iin-.Luiii and packii-i- of dirt and grit betiv,een the bearin(y surfaces by tl-ie sci,ei-,, is ,50 ,tvoided. in Figs. 5 and 6 1 have illustrated another foi-M of wiper cai,riage 64 wl-ilch is in the iiature of a n-Lit or annultis surrolinding the scl,e-kv Shlift-section 27 whose "thread" con55 sists of a spiral ro-v@ of iiiui-friel@-ion steel balls (15 CODr'iiied betweei-i Nvashers 66 provided at t',ie ol)i,)osiue sides of the carriage 64. These bal.l.s ocetil:)y positioiis between adjacent con1-olutioiis of shaftsectio@i 2'@ and function as Go -t thread through wl-i,ich rot,,ttion of sh,,tftse,@tion 2'@ ptopels the carri,,Lge 64 loiigitudi,9.ally with respect t6 the shaft-section. In this,ease +,lie slipporting rod 26 4 a is n-iade of diaineter @throtighout th,e leii o,tli of 65 shaft-section 27 and the interiiiediate fraiiie ,iect;-oji 17a niay be ia,@ide a, i -natelv @cir4 , @ g In Fi s. and 8 another So of carr'@4ge 9 . y@p . I .67 is illtist@iated -wh,ich is also a nut but iiiade -.Nvi-t-h an ii@tQrn,,i]. spiral tl-iread 68 to iaic,,sh TO ttie shaftsectio n 27. Tn the foriil of m iiivention illustrat @ I y I . q @ l i l l jA@io-s. - 9,to I i clusiv , kl@e,@ereiv sj-latt sle,@ve tn ' 3 1-1 I . e .9@9 Qarries -two loose beveledt)@ears 1.9a aiid 20a Qgntint@oLisly driven iii ;opposite directions tti @by t-iie beve@led -eir IS f,.ist o the tipp(@,r eiid of-,a v-ertical spindle 60a to the low end of I . . ; " I . e @ r . t h e @ f - l e x i b l e d r i y e s h a f t 6 2 . e g and 20a are prqvic led tLPOR 11 js e@l@ ot - V v i t h l u g s - 3 3 ( t : t o q o - o p e r a t e 8 0 NA,@i@fh tel ch l@4eiiibers 31a splilic-d oi-i the l@t 29. These,tv,,6 eltitel-i nieln-bers (tre,en7 zon,,,t,ged by a shi per yoke.35b slidably iiiotiiitp ed ivithiyl fraiiie scetioii 15. One ariii of t :be]17Crltllli: Sll,'.ppei. lover 35a is pillotally eoil- 85 i).ected with slide @35b while the other ariii thereof carr-ies a caiii roll ejig4gQd by a C@Llil ffi-oo-@,e,69 pi-ovided t@-I)oii one side of t worin Z!l '- ' 70 vott tabl y sup p o r t e d b y a s h t f t , 7 1 . @lIT(,riiiwli 1-t6isc @inuous.1 ii b go e e o n y c l i - i v e y a vNTol,iii 72 pi-ovicled o,,i the si@,indle @60a and is tiiiied to @llake one-lial-T . a i-evolutioii dui-in,,- I . 1 @ I - " . I Z - 1 tl-ie,.travelof the AA,ipeicai-ria(-e 73 froiii o I ' l e side'of the -vvindsliield to ihe o' Dtiriii(r one iialf of the :revolutioii of 95 Nil@eel 70 its c,,in-i grooi7e acts @through the coiiiections described to hold oiie of the cltit(@ll iiieliabers O'la engaged @iTith o-ear 20a and dtiriliz the other half-- xevolutioji to hold -ed wi til@e cther clutch iiiember 31a eno,ao th 100 beveled gear 19a. In tl-iis w,,ty the screw sllaft is @continuously i,otated alt,erna'ely in opposite directions tl-iei-eby to reciprocate @lie wip@r carriage 73, Figs. 11 fti'ld 13. The intleriiiediate tubililar shelei iiietal 105 fraiiie sectioi-i 17c is approxiinately circular @iii ei-oss-section aiid inade with a sti-ai(ylit Ion-itudinal slot 56a, PA ig@. 9 and 13 tlir6iioli AVll@ell,exteiid two posts or arins 74 forming part of the wiper carriage 73, the bod por- 110 tioii 6f said carriacp, beinoa cylindrical iiietal block skdably fitted within a tubiilar roci or @bar 26a which is lil@ewise iiiade ith w a straig,'tit lojio-itudilial slot 75 at one side tl-iei@eo@ tliroug-h -which the aril'is or posts 74 115 also,extend. This tubular rod or bar 26a, like the rod 26 of Fig. 1, is fixed at its elids to the t@",o end sections 15 and 16 of the fraiiie and rotatably supports the sp' i r a l 1 2 0 meiiiber 27 and the sleeve 29 to w ich li'lemLer 26' is fastened at one en4,. Thiis the enoao'ement of the posts 01, ai,iyis 74 -@,,ith tl-ie opposite sides of tl-ie slots 56a aiad 75 liol:cts i-i-,e carriage 73 @qgtinst ti-irnitip, 125 within the tubular bar 26a while the rotation of the spiral member 27 causes tl-ie saiiie to f act against the sides o the posts or arms, 't4 o i.-eciproc@tte the carriage -when said spiral nieiyib'er is rotated. @ra-ie carriage 73 is eqtiipped witli the usual 130

@4 i,917,200 wiper whereof the stem 57a is shown as f astenecl by screws to the outer ends of tl-ie posts or arms 74. T cieretof ore, the portioiis of tl-ie strai-ht longitudinal slot 56a in the housinq:-f rame iiot occupied by the ,vip(,r carriage have been opeli ,vith th@e result that saiid, dust ,tnd the like wolild be blown throu,(-Ii the same in'u-O said hotisiiig and onto the screw shaft and bearing surfaces which wis h'ghly und sire able. '-L'her,-,fore, as a f eatui-e of my present inventio.-i, I 1-iave hc-roin pilovidec', meajis for ' taniiig ti mairi -L 'ie slot 56a closed which, at the same tilile does iiot 1'.iiterfere with the recil)rocatory iiiovement of tlie wii3er cai-riao-@e. Ilereiii this closure means consists of a sleeve 76 f wi'di ,, spiral slot 77 of coniparatively pitcli so that 'uhe opposite sicto @ialls co-.ict witli tl-ie posts or arnis as caiiis aiid at the s,-@me 'iticie the spii@,,tl f ormau tion of slot '@7 mal@cs it impossible for "i-le two slo'us 56a and 'i7 t6 register ,it any poiiit ol@-lier th,,tii tljtt at -willich the t@v6 s'Lots cross. The t-@vo ,,riiis or posts 74 extend through @L-@icl occupy tli(,, hole at the plact, -vvl-iere the two sl()ts @i,oss while at all otliei- I)oi:pts the SIOIL-, 56a is closed by t'Lie sleeve 76. It will b,,, clear @Llitt as the wider ca@L-riac)-e is reciprocated tlae arms or post.; 74 will act to oscillate, the clo@,ure sleeve blit the 1,4Ltter A,vill rievert-liele-,s ir@aintaiii the slot 56a closed @tt all times 'chrouaholit its le@-i@-th. Fig. 14 illustrttes a f ori-ii of ll'ly iiiv@e-Titioll , in which th,-- spiral me@,-(.iber 27 is fqstelled at @8 I)Y S()Iclei--iii(- oi- otli.erwise to the iiii-ier side wall of 'LIie hotisiiig 15, s,,tid spiral iiieiiibe-i, 2( bein-- s-i-i ported by a ttibular sbaft 26b tl-iat is connected witli a contiiiuousl di-ive-u fi.exi.ble, sh@aft 62 by autoii'latic dri@ill(-- iiiecl).anism lil@e lu-h,,tt desci-iD--d in Cont riect,ion -",ith Fig. 9. 'Uhus the tubul,,tr shaf 2(@b T)erfoi-i-iis -@ho, 'Ltiiietioil of sup I porti-@lg spii-al i-iieiiibei@ 27 a,ftei- thle ft;shion of the of 1.((! 26 of FA ig. 1. aiid 'u-Iie, tubi:tl.,,tr rod 26a Fig. 11. Withiii tlao ttibul,,ir shaft 26b is slid,,ibly k TO ro ded jlL,Ued a cyll,-idi-ical. iiiotal bl'O"@c p vi with a paii@ ol': piris 80 -Ny'iiieli. projtet radi,@tily IUO'li a straialit lon(yitudinal tlirc sl.ot 81 I)rovided at one side of tubttl,,,tr shaft 26b and tlirotio-li spaces betnveeii c6l,,volutions of the spiral member 27b to en(yage the OI)posite sides of a wiper carriage 82 d'Ispo"e@d lil,,ii,,ily N@Titl-iin the ttibiilar intermedia'Le I'@e, the 19,@ter bei,@.ic, iiia@te, as 1-isulil,, a s'@@rai(yht lono-itudinal slot I el Nviiic,l-i an exten ioi-i of said wiper '-Co ai-pi,q(-e 82 pro tii o I c jects tO '- c xter-Or Of seetioii 17c ivhere it ii.a.-, coiiTie@'L-,od to iL the stem ,57 on the wiper cleiiiei-it. u Ivill thtis be cle r tlia'- the spiral mf.,'-"1)er 27 i-s held i-@timov,,tble while the tiibular sha u 26b aiid tl-ie eyliiidi-.ical blocl@ 79 ,ire -03 rotated to(yetl-ior alteriiately in opposite directions thereby reciprocatina the wiper carriage 82. Ref erence is hereiii naade to nly co-pendii).g appli-cations Seri,,tl Nuiub rs 378,143 and e 378,144, filed July 13, 1929, relating to Wiper.. 70 mech,,tnism f or wiiidshields and the like of 'ulie same class as tl-iose herein illustrated and clescribed. -@Vhtt I