.1,763,365 3 at the bottom 6f the chamber and to cool the wax. As will b.e clear, worn out brushes al.le readily rem6ied and new ones substitu'Loci ivheii necessary. Also, other tools thaii briishes inay be -Lised in lieu of the latter tiicl other iiiaberial than felt mav be tisecl for ing the i-ino, 7 The above described cleaning and polish10 iyig iiiachine is of simple ftild efficieiit constructioii tncl. by providiiig the san-io vtitl-i appi-ol:)riate tools it may be usod for a variety of purposes and for other ptirposes th,,Li,i nierely cleanino-, ,tnd -Dolishi-ng. IlTheii 15 iised for a purpose that r@stilts in the procILiction of dust as in surfacinn-,wood o@,: stone, it will be C',-ea.r that the up dratt of air p,,tssiilc", through the ch@imber 12 Will eiitrain aiid carry OR with it whatever dust is prodticed 20 @,@hereby l@:eeping th- floor clean so th,,t'u the tools will act with the greatest efficiency. VVI-ten tl-liis employecl it may sometliues be desir,tble to pro-vide some meins for c6llectin@g the dust that is carried ofl- with the Iq@il@ @-,tich as a diist receptacle connected with til-0 I)OrtS 3a by a suitable conduit or conduil@-s as in vacuum sweepers or cleancre as here'u-ofore c6i,istructed. The strut 32 in addition to servino, the &@ i,o '-unction of t strlit to hold the handle b r 28 rigidly in posi'Lion, also can be used ,ts a handle wheii desired. That is, wli.eii operttii-,g upon stair treads, walls or the lilke the inachiiie caii be readily manipililated E,,ncl iii,,iintained undel.- ftill con'Llrol by grasping the n riit 32 witli one haiid a d the hanclle b,,tr -with the other. By removino: the bolts 27 ancl 33 ap-cl sep,,tr"tting the coi@nector 38 the handle bar aiid G@ strut c,,tn be removed f rom the ,ipparat'lls ivhen d.esi.red. Fio-. 6 is a sectiontl detail take-,q traiisverse1 .y titrough the axis of th e member 16 except tlia@t the latter is shoivn iii 1-1,levatiol'i @aiid "ig A!-, shown in this floltire tl-ie member oi-, piii 16 is ity as ,tn air 1,)ropeller 'uhan the form sho-"rii in Figs. 3 and 4. lvhat i cl,,ti@iii is:-- !. i-'i- iil,.icliii,,e of the cli-Ili@acter described coii-ipi@isiiig @L bftse fr,,tine that is supporte(i cl,@rec@ly b3,, -LI-lo f-loor or the like - inotor iiiot:Lin'eOL I)I@opellei' -L"@ll sl,)Iille(I U-1)(,Ii the sliaf-t of said i-i'lotor aiid a too! co@,,@iected w-Lth said PrOI)eller fail aiici yie'idin I-v lield ag,,Illst the floor ot, thc@, 7.5 9 lil@e by t'Lle i@eget-lioii 'chrlisc of said propeller f- ,@ E. 2. A macliiiie of the clill-irlteter described co,.qstrtic@u'ed iii iccorclaiice Wi@'uh claipi 1 ancl whei-eiii uhe @ropel-ler fan is sep,-,rab@y so Sp-tino,@'L to the shaft o4. said ir@o'Lor so as to. prc)viee --For rem6vtl tlacreol- and tfie stibstitution of aiio@@-her propeller fin. 3. A iii,,tc'jiiiie o@L' cliaracter clescril)o(.'l collip" siii(3, aii iiivc,@rt,-,d ciip-lil@@e base frame 1 ' inhose chime resls upoii the 'floor or the lil@e; in ill(-.tor iiio-Ll,,itod centrally upoil the top o-'L @@,,ticl fraine -v@ith its armatui-e sha'lt ill ,I -@--,o,@ition aiid proj-.ctlllg threacieci qt oi-ie end ancl se-@@-ewed ini,6 111, peller f,,tn splined Lipon the sliaft of said i-notor; a tool c@ilrried b@, saicl propeller f,-L aiad threaded liole provided in the hub 15@ This 7 coiistriletion permits, oip reli'lo) al oj' the -pin 16 ,tn , -1 Nvhel'i the saiiie is removecl the tool car@.,yiiig pi-opeller fan c,,tn be s',Iid ofr froiili the sleeve 13. -VVith tb.e instriiiiie,-.-it above describecl I propose to ftiriiish more thqn 6--,ie propoller f an carryiilg cliftereiit kinds o'L is this coiistruction l@)er,,tiid , ,ill be clear, L em o' r oi,al o-.' one propellei f-alii and the si-ibstitILtiOn of g nother. In Fig. 7 I have sho-",n a modified f6r-R'l of tool holder constructed also to o@erve as a -l'aii o,. proj)eller whereiiil the piqte 19 provides two di,,tme'6rically opposite radial too'; uarryliig arms e,-tch iiiade at opposite sicles thereof ivith veii-is 20, the vein 20 at one side L-eiii,o: clirected obliquely -Lil)-ward and the vein ti.t 4ufic 6-pposite side obliquely clo-wnward. C,,5 '1-'his form of holder will have greater cap,@, C7 il--tto t'ile intej:i@-r of si,;.d bttse frame; a rotai@y 0,0 prbpoller faii C[l)on the shaft f @')@id 1, -L 0 s lllbtoi-, aiict -, c.-.,,riecl by stid propel.@ei-P ii - Lud yieldi-@@,gly 1-.elcl aoaiii--t tl--ie floor or -La t]-io like by the reaction tlir-Lis-L of said rol-)elp f@ln@ l@ - 4. A machl-,ae of the charicter described c6iisti@i7,cted iii P..-cordt-,ice -with cl,,tirfi 5 and I'll 'eFei-," tl"e chime of said btse fr,,ime co nsists of flOOr engto'-. ng pads tli,,it are sepa@n_t i,,,t-d to pi-ovicle raciitl iir conduit grooves ioo b e'k@i,-een theiili qi-id )i7lierein said base frame is provicled Avith ai-i air outlet port. 5. A iu,.icbine of the character described comprisiiig q. n-ietal b,,ise frame annulus; floor p,,icls Of felt c,,Irriecl by the lower 10,5 porti.oi-i of s,,tid base frqme, aiid @eptratecl to PrOvide raclial ,i,ir inlet passages between tb.em; ,i motor ceiitrally mounted ul)on the top of st,.cl fr,,tme witii its arin,-@ture shaft pi@oject,iiig '-be lattei,- a rotar) 11 .7 pro- IC) 11 yiel0iin ly held ,tg,,i"iist tl-ie floor or the like 9 , b3T th-, retctiOT-i thrust of saicl propeller fan ii).cl an tir O-Litlet poit ,it the tol) of said base frame ail.iiul-ris, 6. A mliel-iine of the el-iaracler described c,)iiiprisino, ,t iiiet.),l bise frai-lie ii'ii-irlils irg.Ilt skirt portio-,i provicted Lt its top with r 2ii iiiiya dly extencli-Tig top ivall flange made -v@,-@th an tir outlet port ring of felt or the l@ke stirro-Lindiii<y the ;lo-lwor portion of the okii.@t@ ,iiid projoel'ii-iq below the 1,,ttter, s,-,id @t,ing beiii(@ forme@,. at its bottom -with a se1-ios of flo@@ en@@.qgipl(,y i)ads that are separated i-,," icli to provicle r, al air co-.iduit grooi,es bet-,,@,eei-i therp-; --,,ieans fixedly clam-Dinz said ril"g ill positioii on said skirt; a centrally disposed ele@tric motor mountod tpbn and secured to the top wall flapge of said base l@3

4 1,763i366 frai-ne with its armature shaft in a vertical position ,tnd projectiiig into said base frame. 1.1 rc,tai@y pro-oeller fan within said base frame having a liub splined upon the shaft of said 1-notor a d a pair of radially dis@osed f an L,ri-ns projecting fi,om, ol)posite sides of said ii--L,@b -@iid P. tool sep,,tm, bly but rigidly f aste-ned to each arn-i and yieldingly held against the floor o-,, t'pe lil@e by the reaction thrust of said - aii ariiis. 7. A s,,irficiiicr machine comprising a Ift-aille; a tool r@@n,tably mounted on said frame qiid moAr-,tL-il- axially relatively therleto toward tnd fi-om the -Nvork; a pro@eller fan cojin ecte,,l -with said tool so that its reaction thr,,@,st. ur,,4,,es stid tooll to-7,--ard the worl@, ,tnd means i'or rotating sa;.d tool and propeller f 8. A stirfacing iiiachiiie comprising a ro4,cltal-)I@ slippoi-tecl tool carryina membermade Nyith va-.iep, -,nd yieldingly urged toward the work by the reaction thrust of said vanes @,,,hen the member is rotatecl; meaiis for rotatin,y sqid meiilber and a, frame by which d e 0-5 . n-iemb r is supported so as to e movab'Le towqrd and from the -work. Signed by me at Boston county of Suffolk ancl StItte of Massachusetts this 16th day of De,cen-iber, 1927.@ 30 GEORGE H. NOBBS.

Patented June 10, 1930 19763,365 UNITED STAT@ES PATENT OFFICE GEORGE H. N01313S, OF WATFRTOWN, IYIASSACHUSETTS SURFACING.iYACHIN3,1 Application filed December 22 1927. Serial No. 241,743. My iiivention relates to surfacing machines genc@rally, ancl particularly t6 imachines for cleajiing, polishing and otherivise operating tipoii floors, fixtures, furniture aild the like, ind it hts for its object to provide an iinproved mtchine of this class. Maiiy attempts have heretoforc@ been made to produce a practical clecti@ically operated floor cleaning a-kid polishing maeliine and ,lo some 6f thc-,se mtchines htve beeii qliite stic(,@essT-Lil iii eliminating the laborious worl@ formerly required to cle,,tn and polish a flo6r by M i an hand. y of these machines, however, were so constructed as to apply too inuch 7.@; pressure, or not enoligh pi-essure, upon the brush, pad or other tool to produce the desire(i result, particularly wheii giving the final luster iliat is desirable as a finish to a floor. In many of these machines this was @o clue to the ftef that tl-ie entire weight of the strticture was soinet-imes carried by the brushes or pads anci sometin-ies by roll(,,rs pro-vided 6,i the franie and i-esting 611 the floor. With the last mentioned type w,,is present the 2.5 objection that the brush or other tool Nvould n6t pi-operly follow iiiequalities or any un-. 6venness in the fl6or. Flirtlierinore, m,,tchines of the latter type were further objee'Lionable for the reason tl-iat the wheels or rollers were --30 liable to surike and mar or disfiglire the woodwork. Machines of that ty e where the brlisl-i p or other tool supt)orted tl-ie @vhole weight were obiectionable, also, f6r the reason that i'u was clii@cult to dl'rect ,tnd control the s,,tme owing 35 to the tendeney of the rotating or otherwise n'lovable brush or pad to shift the structure a;bout. My invention has for its objeet to pi,ovide an improved surfileiiia machiiie and ptrtieli40 larly a machine of tllis class for Lise in cleai)-7 idol or otherwise operating upon flooils fixL@ t-Ltres ftirniture an hich will be I , cl the like,: -W free and clear of the objections not"ed above and w.1-iieh - will possess certain other adva-ti45 tao-es hereinafter pointed out. To these eiids I have provide(i an improved inaclaine for opera,tin(, upon floors, fixtlires. ftirnitlire and t-he lili:e, 1- iaving the peculiar featlires of constrlictiop- ,Lnd mode of opera50 tion set fortli in the following description, the novel feattires of the inveiltion beiiig particularly poiiited out aiid defined in the claims at the close thereof. In the acconapaiiying dr,,twii-lgs:- FigLire I is a side elevatioii of -@ floor polish- 55 ing machi--Lie constructed in accordance with my invention. Figure 2 is a section on line 2-2 of Fio,. I Figure 3 is a, central vertical sectional view of the lower portioii of the n-iachine shown in Go Fig. 1. Fio-ure 4 is a bottom pl,,n view of the parts l@ho n in Fi@@. 3. Figure 5 is a section on line 5--5 of ri ig. 3@ Figure 6 is a sectional detail herein,,tfter 66 described. -Lgure 7 illustr,,ttes. a moclification. In the accoiu-Danying drawings, I liave illus'urated my invention as einbodied in a machine for use in cleaning and I)olishing 7e, floor.-- or other flat surf,,tees, said mechine ineludin g an annular rinu-like i-netal base fraiue I liaving a vertical iml)erforate circular skirt portio n 2 pr6vided at its top with an inwardly extending flange or top wall portion 75 3 formed upon its upper side wi-LI-i a socket 4 within -which is seated oDe encl of the frtiiie of a high speed universal electric motor 5 whose ai-mature shaft 6 is clisposed vert@ically as sliowi-i. Motor 5 is secured in place ivithin 80 the socket 4 by lileans 6i screivs 11. Su rrotindilig the lower end portioii of tl-ie skirt 2, and abuttiiig in anntilar rib or shotilder 21 provided upon the exterior of the 1,,ttter, is a felt ring @ baving its bot'LOiu side 85 forme d witli a pILirality of radiil air inlet condui t grooites 7a which, in effect, divide the bottom portion of- ring @ into a eircultr series of floor encaging pads @b. This felt rinly 7 is clamp ed or colql)res@ed oli to the skirt 2 by a ringencirelina shoel, in--,U-al belt or st rap 9 -vvho-qe ends are ftste--ed tor-_tl-ier b.17 ineans of IL bolt 10. Both the loii7or edge of bei'Lt 9 and the Icwer edae 6f sIKir@ 2 @ire above tl-ie level of the ,Lir inlet Co,l'lduit grooie 7a s shown clearlv in Fig. 3 of the drawiiigs. IS Thus the 1 is an inilerted cup-like structlire vvhose lower edge or cliime is CO.1stitutecl by a felt inei:nber 7 her(@iii as fornied u-,oon its bottom side with radial con-

2 1,763,365 duit grooVeS @a throligi-i which the interior of .said franie communicates with ti-ie oiitside atmospliere. Ttie top ivall 3 of this -Lllver'Led cup-like frame structure is made with a plura,lity of air outlet ports 311. The shaft 6 of motor 5 projects downwardly i--ito the chtmber 12 provided by base frame I and has mounted thereon a Ile6ve 13 @that is fixcd rigidly -[hereto by a pin 14. Slidably inounted upon sle-@ite 13 is a, hub 15 that is j; 0 by riio,@ns of s,,:) ned to the sleev a pin 16 carried by said h-Lib and exte@.iclinz through longittid-inal slots fori,.le,-l in the sleeve, on'e of -,vhicli is shown a@L, 17. This hub 15 is niade, 15 il-ear its u-Di)-,r end w-Ltli Lr. annular flange 18 to the Lina@r sicle of ivliieh is rinetedi a sheet Met@-@l plate or @sttip 19 foi-med ,it its middle Avith aT-i aper,'-Lire throtio;h wliieh hub 15 extoiicIF,. @ @Thi-s plate 19 ivith its hub 15 consti2i ttites the bocly po,@-ti-C)n of -, fan or pr,Dpeller b@@ing proi,ided @tt ol,)pos-Lte sides there6f with obliq@ielv disi)osed 'Lan blgcles 20 whicli, Wlien tl@ie shaft 6 is ro'Latld iii t he direction of the -_Ilrow iii Fig. 3, foi@ces the air Within base 1: 25 ul)ii,ar,,Ily ii-ito the u@,i)er ijart of chamber 12 whence it escar,es thr@ugl-i the ports 3a The rc@latively low, air Dte,,,sLire e-qtdblished below the f an effects a,-i inward flow of aif ti-ii--ougl-i the conduit grobves 'ta. @ Thtis when 30 Motor 5 is rtinning currents of air are conltinliously flowipg inwardly throuoh said conetuits and across the fl6or surface at the bottom o-L chamber 12. The plate 19 is @pertiirod to ao-c omrnod,,tte s5 screws 21 by nieans of which two bristle briishes 22 ftr'e see-Lired to the Lind-,r side thereof at opposite sides of the bub 15. It will thus be cleajr that when the rnachine is in opor,ttion the reacti6n of the p@opeller or f aii 40 (@oi-istitiited by the hub 15 aiicl plate 19 with its wings 20, )@ill tl-irlist ,Lnd h6ld th-- brushes 22 forcibly against the floor 210, and this utilizati6n of the reaction thrust of the propeller or f an to f orcibly, yet yieldingly, hold the bru@h 45 or other to6l against the worl@.,indepeTidently of the weight of the machine is an importaiit aiid distinguishing fe-,iture of my iiivention. The top side 6f the wall 3 is formed wi.th l@-Ligs 26@ Pigs. i and 2, to A@vhich is pivotally 5o connected, as by a bolt 27,'the lower end of a I liindle bir 28, said lower 6ild being constittitecl by two o.@p@sitely disposed strap iron olrms 29 and 30., The top of the frame of mOtor 5 is M'a4e V@lih, aii upstandin- pair of lugs 31. embracing one end of a rigia iiietal str,t 32 to which they are pivotally connected by bolt33. Theoppositeendof'strut g2 . a OCCUP'es a, positio-n between the ends of a stra@ iron sleeve 34 MOLli-ited tip@'oii the handle bar 28@ PiVotall.)T .il@) Sq,icl ends beina connected -v@ith the ,@'U-rut @2 by mea"ns of a b@lt 35 provided with - @ a @vino, ni,,t 36. When th se @th @n e nut 36 is loo e sleeve 34 can be slid lengthwise of the handle b,-r to adj-List the angle and height of the filee L end 6f the same. By screwing the nut 36 up tight the sleeve 34 is clamped immovably to the handle bar aiid at the same time the ends 6f the sleeve are claniped agaiiist the ol:)posite sides 6f the ep-d of the strut 32. The circuit of motor 5 includes wires 37 70 each perinapently connected at one end with t,@.ie riotor 5 as usual. The opposite ends of tbe@ -Nvires 37 are separably connected by a. twop@- rt@ con.-iiecluor 88 of usual coiistruction witli the lo'Wer ends 6fa pair of wires 39 which 71$ e-@,-L'end -Lipw'ardly through a hole or groove provided in handle bar 28 to the Lipper encl of the l@itter. The upper ends of these wires 39 qre f astened to a double couplip-o- tei,minal 40 of -Lisual const@ucilon by mearis of wliicti 80. t-'L-iey niiy be connected witli a current supply. In one of the wires 39 is arrangod a plisb btittoii switch 41 inounted on haiidle bar 28 and so lon- @s the operator iuaiiitains finger presslire oiti the push butt6n 42 of switch 4i the eircui_t ofmotor 5 is closed and the latter is oi)erit'n When the push button is reloased this switch alitomatically opens the eireliit of motor 5. The pin and slot connection 16 and 17 is oo so as to permit outwird n-ioven-ient of tile brushes ,tnd their fan holder into positior,@s where tl-ie floor en-aoinfy ends o the bristols are Nvell ou'tside of the plane of the b6ttoiii side of the felt ring 7. Tllerefore, ga whe@n- th(, i-nachine is placed down on the floor for iis-- the br-Lish holding fan will be shoved b,-teli: 17ito' the base 1 until the felt ring comes to rest upon the surface of tl-ie I floor. Now, iv'ileii the motor 5 is started bv closing the loo s-"iitch 41 the brusbes 22 are rotated and at the same time the propeller or fan exerts it dowiiward thrtist on the.brLish@,- s whii3h holds them ag,,tinst the floor under pressure as they rotate while , also, air is caused to circulate io5 through the condiiit c,,rooves 7a, the chamber 12 and ports 3a as described above. While the motor is operating the machine is slid abo,,it over the floor by means of the handle bar so that the floor ig @acted Lipon by tl-ie felt @iio, 1),tds 7b as well as by the brushes. Thus Avhen a cletnln@,- or polishing fli-iid or medium is -first spread -Lip6n the floor and then the latter is treated b3T the machine, t,be felt pads serve to rub such,flliid thoroudhly into, and spread i-i5 4t ,tboiit evenly over, the floor in advance of the brushes re-uardless of the direction in ivilich the n,.iachin i 'inov d. e s e In polishino., a floor the felf pads 7b m:iy be tpplied to the flo6r wlih an-v desired pressurp, 120 by bearin,o, down on the handle bar, thi,-,s pi7oducino, th@'e deoree of pressure and friction necessary to rub the polishing fluid'iiito the floor and to warm or heat the wtx iD oredient tn 125 of the fluid which is desirable in applying the I-,ttter. Meantime the brushes sweep over the surface of the floor with a relatively light ('10ssinb,- pressute while the air passing LI thr-ough the chamb6r@ 12 acts to dry the floor ilso