claim is: 1. In -a --rindinlr machine, the combina- 89 tion of a bc@rizontafly movable work @upporti-n(,, table, a, wheel head positioned above the table@ and capable of vertical movement, a -Irindinc, wheel and a, spindle therefor rotitably mounted in the head, drivin I g means 85 for said@ -v@he , el comprisinlr a motor'mounted in alinement wi 'th the ax@is:of said wheel, a; shaft coiine6ted to said motor having a,-slidable connection wi.th said -v@heel spindle whereby the head with the spindle and wheel 9'0 m y be moved vertically indei)endenilv of the a motor and its shaft while the wheel engages the work and -%vithout distutbin- the power c6nnection, and means in said head for resiliently thrusting said wheel and @pindle -d@- 961 ward@ independently of said ni6tor and MOtor shaft. 2 In a grinding machine, the combiiiation of a horizontall mo-@able *o@k SUPy porting table, a wheel liead positioried . @bo:ve lob. the t,,tble and capable of verti6al movem6nt a grinding ivheel and a spindle therefor rotatably mounted in the, head, an 6lect@ic drin,ing iiiot6r mounted in fixed po@iti6n with the axis of its rot6r in alinement w 1 1 05 the axis of the spindle, and slidabl6 conree,tion betweeti the m6tor and the spindle ivliereby the b6ad with.the spindle ,t.nd the@ wlieel may be moved v6rtically inde,,pendently of ihe motor wilthout dis.turbing the,' liO power connection. 3. In a grinding machine the combination of a horizontally mo'vrtble work supporting table, a wheel h.@ad positioned,above the t@tble and ca.pable of vertical movement, a 115 -,@,beel and a spindl . ther fo g@indino, e e r rotatably'@i-ounted in the hea,d, and an electric drii,ing motor mounted in fixed position with its driving shaft in telescopic splined engagement with the.s'iridle, whereby the@ iqo P head with the spindle and the wheel may be moved vertically independently of the mo-. t6r without disturbing the power @connec-. tion. 4. In a grinding machine,, the c6mbina- 125 tion of a horizontally rtiovable work support-: ing table, a wheel head positioned above the table and capablp- Of vertical movemeiit, a grinding wheel and a spindle therefor rotatably mounted in the head, an electric dr 130

ing n-iotor motinte(I in fixed position with the wheel on the motor driving sh,@ft and a belt axis of its rotor in alinement with the axis of the spindle, and a power coniiection betwe6n the motor tnd the spindle which is both flexil,)Ie and relatively slidabl 5. 'I-ii t grindin- machine, the dombinatioii 6f ,t liorizontally movable work supporti.iip,, table, a wheel head positioned ,ibove the t-able and capable of vertical movement. 10 a grinding wlieel Lnd a hollow spindle therefor rotatably mounted in the head, an electric driving motor mounted in fixed position with its driving shaft extending into the hollow spindle, two adjacent rotatable 15 elements ctrried by the wheel head one rigidly connected to the spindle and the other splined to the motor shaft, and a flexible driving connection between the s,,tid elements. 20 C). In ,i grinding maebine, the combination of t horizontal rotat,,tble work supporting table, a wheel head positioned above the ta-@le and c,,tpable of vertical mov6ment, a grinding wheel and a spindle therefor ro25 tatably -w-ounted in the head, an electric drivi-ng rxiotor mounted in fixed position witli the axis of its rotor in alinement with the axis of the spindle, a slidtble connection between the motor and the spindle whe@reby 30 the head with the spindle and 'the wheel may be moved vertically independently of th6' rnotor withotit disturbing the power conn,ection, and a drivin connection from the motor to the table. 9 35 T. In a, grinding machine, the combination of a horizontal rotatable work supporting table, a wheel head positioned -tbove the table and capable of vertical movement, a grinding wheel and a spindle therefor ro40 tdtably mounted in the head, , an electric driving motor mounted in fixed position with the axis of its rotor in alinement with the axis of the spindle, a slidable connection betweeii the motor and the spindle whereby 45 the head with the spindle and the wheel ma be moved vertically independently of the motor withoi-it disiurbing the power connection, ind @i driving connection independent of the spindle from the motor@ to the 5o ttble. S. In a @,yriiadinff machine, the coihbination of t li@rizontal rotat,,tble work supportiug table, i wheel head positioned tbove the t.,Lble and capable of vertical movement, a 55 grinding -wheel and a spindle therefor rotat,,ibly mounted in the head, an electric drivin- motor mounted in fixed position with its driving sl-i,,tft in alinement with the ,,txis of the spindle, a slidable connection 60 between the driving shaft and the. spindle wliei-eby the head -with the spindle ,tnd the wheel may be moved vertic@lly independently of the motor without disturbing the po,ver connection, and a driving connection from tbe, motor to the table i4cluding a belt engtging the said belt wheel. 9. In a &rindin- machine, the combination of a ho-rizont@i rotattble work supp6rting table, a wheel liead positioned ,tbo-@e the 70 table and ea able of vertictl moven-ient, ',I. p -rinding 'wheel and a, spindle therefor rotatably mounted in t-he head, a, foed mechanism for the wheel, table turning mccl-ianism located beneath the table and including 75 change-speed gearing, me,,ins at oiie side of the machine for driving the table turning meebanism, tnd a power connection between the table turning mechanism and the feed mechanism, the said cojinection being 80 independent of, the table tnd lo6ated at t.@@ side of the table opposite the driving mealas. 10. In a LyrindinL, machine, the 6ombination of a ho-rizontal rotatable work supporting table, a wheel hetid po8itioned above the 85 table and captble of vertical movement', a, grindiiig wlieel and a spindle therefor rotatably motinted in tho head, a di-iving motor having its driving 8haft in aliner-qe,nt with and connected @ to @ the spindle, me'eh,,i- 90 Dism for turning the table, a driving connection from the m6t,or to @ the ttble turn @ing mechLniS a feed mechanism fot th6 wheel and a driving connection independent of the table between the table tiirning mechan@sm 95 and the feed mechanism. 11. In a grinding machine, the combina.- tion of a, horizontal rotatable worIK: suptin@ table, a wheel ho@ad positioned above po-r the table and capable of vertical movement, 100 a grindino, wheel and a spindle therefor rot,,ttably n@ounted in the head, a feed mechanism for the wheel, a driving motor haviing its driving shaft in alinement with ,tnd conn eted to the spindle, table, turning mecha- 105 nism located beneath the table and including change-speed gearino,, means ,tt one sicle of the machine for driving the table turning mechanism from the motor, a-nd a power connection between the table turning mecha- 110 nism and the,feed mechanism, the slid connection being independent of the table ,tnd located at the side of the table opposite the driving means. 12. In a orindino, machine, the combiiia- 115 tion of a horizontal rotatable worlc supportiT,91 t,,tble,, a, wheel head positioned above, the tlt e and capable of vertical movement, a grinding wheel and a spindle therefor rotatably mounted in the head, a feed illechl- 120 nism for the -,vheel includino@ oearincr at one side of the machine, a shWfCtssociated with the feed gearing and extended across the machine, table turning mechanism located beneith the table,, means at the side, 125 of the machine opposite, the feed gearino, for driving the table turning mechanism an the said shaft, a power connection between the table turning mechanism and the feed mech;tnism, the said connection being in- l@P

d ndent of the t and located at the @'i'Te6of the table, op 4o's'i'te the driv'lnor p .1 means, and, means for optionally connecting the feed gearing with the said power connection for slow feedin or with the, said shaft I 9 for ral)id movenient. 13. In a grinding machine, the combination of a horizontairotat@ble work supporting table. a Avheel head positioned above the lo table and capable of vertical movement, ,t griiiidino, wheel and a spindle therefor rotatably mounted in tl-ie head, a clriving motor baving its driving shaft in alinem6nt with and conriected to the spindle, a f eed rnechai5 nism for the wheel incliiding geai-iri- at one side of the machine, a shaft associatecl with thE@ feed gearing and extended across the inachine, ta-ble turninly meelianism located beneath the table, means at;the.side of the ma,- 0 chine opposite the feed for driving the table turning mech,@nism "Ind the s,,tid shaft from the motor, a power connection betw,een the table lDu@-ni@g inechanism 'and the feed rnechanism, the said connection being 25 independent of the table and located at the side of the table opposite the drivirig mea t ns' and means for optionally connecting he feed , gearing with the gald power connee tion for slow feeding or, with the @ said shaft 30 fok ra-Did movement. 14. In a grinding macuine,, the combination @of 9, horizontolly movable work supPor-tinLr tablel a , grin ing w heel- positionecl d' @bo@e fhe tabl@ anci e,,apable of vertical moveme,nt and iu'feed mechanism for the wheel. 35 manually operable @ shaft a coniprising a ratchet@ wheel secured to the shaft, a ri4(,r frictionally connected with the, ghaft, a, power op@erated oscilla-ting pawl for en oalolt, t, ing the ratchet wheel, a plate - carr-ied by th6 40 ring and adapted to ehgage the pawl as the ring turiis ,Liid thus stop tl.ie power feed, ,t projection carried by the ring and ii stop for eiigagino- tlle pro'ection t6 limit@ the movement of the ring during hand fe g. 45 15. Iii a. grinding machine, the com ,t@ tioii of- a horizontttlly movabl.e work supporting table, a grinding wheel positione(I i).bove the table@ and cap:ible of vertical movement, a,@.icl a fee'd mech,,tnism for tl-ie wheel 50 con-iprising a manually, operable , shaft I a ratchet wheel secured to the shaft, a gradtiated disk secured to tl-ie shaft, a ring frictionilly colinected with the sh,,tft between the ratchet wheel Iiid the, disk, a power op55 erated oscillatin(r pawl for engaging the rltehet wlieei a-plate carried by the. rino, and ad,,Lpted to engage, the pawl -@s the ring turiis and thus stop t-he power f eed, a projectioi-i carried by the ring and a stop for, 6 - 0 engagin- the projection to limit the move@ me t l@the rino, during hand f,eeding,,the n 0 @:1 stop serving as a poirilter to co6perate with the gradu,,ttions on tl-ie disk to indicate the amount.of feed. 65 In itestimony whereof I hereto ,tffix my signatnre. BENCXT @M.@ W. 1-iAN$O-N.,@

It is hereby certified thttt in Letters Ptteiit No. 1,392,325, grtinted October 4 L6 cy@ 1921, upon the ,tpplicition of Beiigt M. W. Hai-isoii, of Htrtford, Connecticut, CIT M errors ,ippe,,ir i-ectuiring co'-rectioii ,is follows: In the griiit and iii the hoidiiig to tll6 printed specific,,ition, title of inxentioii., for"'Verticii.-Sui-faceGrindilig Machines" retd Surj4ce-Grinding il/laclbines;,p,,i@,e 1, line, 6, stiike out the word a) tnd hyphen "Vertical-"; ptge 2, I'no 113, for t lie word " beiriii(ns" re,%d bea,,- ing; word " shuck" read c7buck; tnd thtt the s,,tid Letters -Ptten t page 7, line 42, for th(- a) should be retd with these cori,ections thei-ein that the stme mty conforni to ti-le ttent Office. record of the case in the P, Sl,,ne(i and se,,iled this 15th diy of Noieiiiber, A. D., 1921. [SEAL.] ICARL FENNING, 0 Acting Commissioner of Paten,ts.

U@N@l@TE.D @S@TATES'% PATE-NT -OFFICE. .BENGT@M. W. HANSON, OF,HARTFORD, CONNECTICUT; ASSIGNOR TO PRATT & WHITNEY COMPANY, OF, XFW YORXI; @N. Y; A CORPORATION OF NEW JFMBY. VERTICAT@-SURFACE-GRINDING X ACHINE. 'ted @Oct. 4, 1921. Spe6ification bf Lett@rs Pat6nt.': -Pat 4on u Application iled..T ly 31,1918. Serial No. 247,633. I o all w7to@i;?, it.linaly colicem., Be it known,tl-iat I, BENGT M. NV. 14ANSo:"Tl a citi@6n'@f tl@e Uiiited States; resi,din(y at.-@H@r@f6rd in the@coun@y of H,,trt@ord, and '- State of @con@ectictit have invented cert@i]R new and!useful-Improvement@ in Vertic I aSurface-Grii@ding Machines, of -wl-iieli the foll.owiilg is a specification... .The invention relates especially. to orindio ing machines- of the type-in which each is .Prlovided with a, oi-inding wheelor ring Whi@h@ is rotata@ble"@'about a vertical @xis anwhich- acts upon worlc secured to -a table or support which is horizontally movable. In 15 the present case the work table is rotatable. One of the ob-i@ct@ of tl-ie. present. inITen7fde a@. improlt@d dri@ -tion ' t nff is o i Pro, t-, I mechanism-Tor the wheel, this consisting of tin electric, motor mounted@ in.axial aline)o ment with tho wheel supporting spindle.aiid 'havin@ -,,t slidin ,.6oirinectio@ with the spindle whi6h pe@mits the@ wheel and spindle to b6 moved vertically independenfly' of, tli@ bje@i of t@-.ie i'nveiiti.on@.is mot@ Another ol to p,rovide improved mean for. r6t@ting tllie table and for@ contr6llin@- t,he @ niovf,,inent eo tiler f. A@other 0 -bject,6f tl-ie invention is VP to' pr6vide impro d@mel%ns -for ni6vi..n,6- the 'Yrindiiiu wheel, vertically,. aiticul@rl for p 3 0 fe(@din-@-it duriiic, the orinding 6perati6ri. Aii,,"',her object the i@ to pro.- VI(16 iinproved o@u,@rd@ - for pr6tee@ing t]-i,- the 'Whe @ve:rt,ical way@ @,rong which el sup po@iiii@ -he@d i8 movabl e. 35 -Fu@Fl@er obje(,,ts 6f tl@6 in nti6n will -be ve @ap@a@ent: f@om t@e - f-o'llowinz specific@tion ,t.Tid crairns.' In the "Iccoiil,@anyii-ig @iawings I hai@@ n em sho* tl@e@ b6dinient of the inv@ntion 40 which I, -now deem p@6ferable@,-, biA it will be 0 'LI eirsto d; that as concerns many of t-lie dificatio-n@,'tnd sub@ re - c, e MO :f eat-Lires, -the in@ b 'Stittitioil of equivalent , witbout -departin @ly f@()m the-,spirit of ihe i'@i,ention,ak; s@i f(ril@ 45 irl@tli6 61-,iii@s a pe@nded to, this:specificati6n. p drawi4gs.@,- 4 ioure- l'-is a @side -vie W. Fig.@@2 is a fr6nt vie* partly,.ili-section. Fig,., 3 is ,t frctgffi6nttry,fro@t vi@-v@ partly 50 in secti6@ @showi@g arts6f the o-ua d . p r s FI(y 4 is a plan V'Iew. view,,ttken tbro-Li@h@.the @eenter. of :the m,,ichine@ I the grindinz --wheel' and tt@,e diiving mechanism theref@@'beiiiL@- shown i el@v n a- 55 iioia. Fi@,. 6 l@ a, ft-a-iiientary hori@ontal seetional. viow takenr'@along tho 6-L6 of in F' 5 u I '7 is'a detail view showing a part of 60 th 6h anism for moving the wheel head. Fig. 8 is a, vertical sectional view throuo,,h the @ orindiii@, wheel and the supportincr -Ini@m Cher6fo@, itlecli the @'view being ttlc@@ along the linp_ 8-7@8 of Fig. 5. 65 -F- i g., 9a fialrmentaty horizont,,il seetional -@i6w.@@k@i@'alo@L,, the line .9@9 of Fik. -8. Fig,'10.is a,ver@i6al loiigitudinal - sectional 1winc, tli@ 16fi-'htnd part of the driv- 70 view sho - M @inz mechanism @oi the-table. The view is taien-laion, the line 10- 11 of Fig. 12. Fi-. '11-is t @ertical longit-Lid:in,,tlsectiolial 'view sliowill-. the @ight-l@and @art- of the drivink iiiecl@'anismfor tl-ie tabl@. The view 75 is f,,t@en tloiic@ the iiiik 10 11 of Fi,7@. 12.. Fig. 12 is. a pl an vie'v@ sho@vink the, drivi@g meel-i f anism or the table, this view@ b.eling p,,trt , , iy in !@@6@ioli al@no, the lines. 12-12 of Figs. 10 an4 11. 80 Ti'l 9., 13 i s,'@ fra--ni@@tary, vertical longisectional view on an enlaro,6d scale i,loiiig t@@ Iii@@ I@-i3 of Fila@12. Fig. 14 is a ve@tic@l secti6nal @ view taken .along-the line 14--14.-of FAI,. i2. 85 f fary side vie-v@ takell I4'ig. @ f 5 is a ragmen from the left sliowino,, tl@@ drine wheel and the l@oii'siiio,, for the e n M m el-in, is which drives the table .10'. 16 -is@@a vertical@. sec,,tio nil. view taken go F ' al6i @" the lin6 16-16 )f Fig. 11. l@ l@ fragmen ttry side @iew takon froi@i- th6 ri(Tht and sb.o-winsy the C6Dtr6lli-ha ris evices - or the@ mee ,I 1-@ n ch driv s the@ d f e tab le an d al@o @ sboN@in,@ par t of the d iv- 95 iiio, oearin, o, for @th,, wheel feed mechinism. -Frg.. 18 is ,t front'view sbo-5,in(y tl-ie housing aiid oar't of the@ conir6llinL, @evices for -ieel f the WI eed mechanism. Fi(,Y. 19 is ,v side view t,.tl,- en from the ri!Zht loo the, @parts shown. in Fig.: 1,8. This view i,,, partly, in section alon(Y the@ line 19-19 @ of Fi,7. 20. !Fio,. 20 is a sectional view taken Fig.: 5 is.a longitudinal vertic@al s-e@tioiial a',Ioln@'the lines 20,-20 of Fios 1 9 , I ) n d 2 2 . 1 0 5 Fig.@21 is a fragmentarvvortic@l sectional --

view ta;ken along the line 21--21- of Fig. 19. Fig. - 22 is I a vertical section@,tl view token along the lines 22 22 of Figs. IS and 20. Fig. 23 is a horizontal sectional view ta-k@n a@long t e line!@ 23-23 of Flas. 101 .22 and 24 Fig. 24 is a vertical. sectional,.view,toLken along the lines 24-24 of Fio,@. 18 and 20., Fig. 25 is a fragraentary rongitudina@l seelo iional view tal@en alon the line 25-25 of 9 Fipi 23. g. @6 is. a fragmentary secti6nal view, taken alon- the lin@ @ 26-26 of Fig. 25. p F' @27 is a ve@rtic,,tl sectiofial vienv taken i 5 along the line 27--27 of Fig. 4 and showin g the water. pijmp. A machine embodying my inventioli COMprises a horizontal rotatable table 1 ada,pted to siippoi,t and hold the work to be. ground, 20 and a horizontal gririding I wheel 2 whie-h is r ot'atible!about ti, @,ertletl@ @xis and whicli is adapted to enga(ye "ind@ arind; w6rk.supported oii @the table@I., The rotatable table 1 is nio -unted on a 25 base fram6, or h6usiii(r 3 Whi6h is pro*id@d with a vertical @bea,ri-ng 4. The. table 1 has a dependidg central.-trunnion 5:which fits th6,bea@ing,4 and is r6t@,table therein. Seciired- to the bottorn of the table I is a ring 30 6 ivl-xich has a b6aring upon an annular surface of th@, base frame, 3, thu!s . s6rving to support the table. Preferitbly the ring 6 @ is f6rmed With gear teeth@8 by means of whic@h the, table . may be: rotated in the ma@nner to 35 be e e@tly described. l@rrelfer,fibly, in. otder that the bearing at I vind the oth,er @a@ts underneath the table may be pr6tected from iva@ter ,,@hd dirt, the table is provided near its edge with..an an40 nular groove 9 ext,endinl, upward from the of the screw the: head can be moved vertically and can' be held in iiny desired posit 0 of adjustment, as -will be more clegrly @set forth hereinafter. For assisting.-in carrying the @ -v@eighi of the head: 14, and of the 70 parts connected th6reto, I provide a co-Linter@veigth 22a which.is@ connected to the head by means of a chain 22 b passing over pulleys 22c and 22,1. iaterposed between the u@@er bearin 75 9 bra6ket 16 aiid the spiiidle is a, ball beari -ng 23, is shown in Fig. 8. This bearing 23 serves simpi as a, jouriri@il bea@ing hnd -has y n , o functiori@in determining the i lativ6@ ver etic@l ositio of the spilidle. : The out p n er race 8o of the bearino, c,,tn adju itself vertically in "tecordance with the spindle position.- Preferably tl-iere are provided ,tt 24: devices f6r holding and DreVenting the escape Of:'Oil which may,be'suppliej froin'ah oil cup 2 1 85 Interposed between the lower pgrt of the I spindle 18 and the bearine@ b@ack-et @i7 is a ball bearing. 26. Also ii@te.r@osed between the spindle and th e' bearing brac ket@ l@ aiid i ab a e,@ positioned, o'@e,"tho be rinc, 26 is ,t second go b,.ill bea,rin(r 27. @ Tho tivo ba.11 beqi-ino,,s 26 Lnd 27 co8l)ie@at bhe spii@dle a 91 e to hold i g"lT'st" vertical movement with r6sp@et'tb. the wheel hefid in either diiection. In order th,,tt the"'r'e mav be no lost' verti@al motion in t-hese becir- 95 ings,- th6 i.nner ra(@e of th6 upper bearing is -@ertically slidable on the pindle tiiid 19 p@essed aownw,,trd witl-i resi-)(@-,t.to the s@@iii.dle by- mean of tw6, sf)@irij pliiiibers 28, @28 which engage a, rin@ 29, the @in,,,y in turri en- loo gaeino, the inner race of the, 1)4--,trin-. These spring plungers are mount6d in a @iiig 30 ivhich.a,btits a,--ain@t a 6611ar 31 thre,,ided iiito ihe sliaft ,tnd'iocked by means o.f,the cl,,tni p ing screlw 32.. The tw6 rings 29 and 30'are l@05 @oroo@e ther proj6cts a 'held a ainst''Irotati 'W th6 bottom. Into this e on ith@ res@ect th t@, . 9 orme - telra flancye 10 prefe@ablv f d in @ly with spindle by metns of a IKey 33. It will be' seen the bas6 frame. Surr6undinz tyie table is that - the@'sprino, @lungers tena @to- press. the a flan e loa preferably const@udte4 inte @-,rallv inner.race of ti;@ b6a@irio, 27 rel,,ttively do@w'n9 45 lwith the base 3 and formin a trough or wa@d; or in other v@6rd@, th6. plungeks tend 110 9 gutter f6r recei;vino, and c@rtying away wato lift the spindle and th'e - y@he@l- fli-i @ tejidteir from the grind@;n- wheel.' enc@ being c6unt6racted b@ th lowe'r ball e e: rear bearing,-, 26. t@6 Secured to the b@se frame 3 at th In thlis s@iiidlo and of the table is an ulpward extendina,housing the Wheel a,-re always maintained @ in' thei'r 60 11. This h6iising 1 provided wit@, veftical uppermost relative P'Ogltlons and no vertical 115 gtlideways l@ in which is fitt6d@ a slide 13 pla-yin the bearings is permitted. formed on the wheel head 14@. The@slide 13 Lubrica@t for the bearink 27 ca;n be -S@UPis, h@ld in, @lace by vertical plbltes, 15. The plied fr6m an oil -.@up.,- 33a. @ p refer,,tbly a wh6ol head 14 is@ provided with two bearing shedder.34 is held betwe n the ring 30 and e 55 btackets 16 and 17 iii -%vhich the rotatable the collar 31- this sh@dd6r co6p@erating with 120 :wheel[ s@indle 18 is m6unted. The aforesaid th@ aniiular flan,&e@ 35 and 36 @@pported 6n I wheel 2 is connected to the lower, end of @the bearihg bra@ket 17 to prpvent 6il'orl dlit the spindle. from enterin @ the ball bei@rings. Piefer9 ' I f r o m t h e u p p e r @The,wheel head 14 is @rovide,d with a lug ably, in order to prevent ol 60 19 which pro.jects toward the reetr. This lug beajriiig 27 firom re@chin@ I ihe@ lo*ei, bearing 125 h,,is a, vertical @aperture in which ig fitted a 26, there is provid6d a @ @hedder 37 '-v@hich cothreaded sleeve 20. Extending through the operates with -& bu@hin 8 carried: by the @sleeve ,tnd en'oaging the threads thereof is be,,iring bracket IT g a vertical screw 21' rotatably hiounted in The grind@ng wheel 2 i prefero@bly'in the 65 be@rin 22 @22 in the hoiisin@ 11. B means forih of a@ring as shown, and this is'@eon- 130 y

t 0 Sp. d6 f7@the a's I -d@ to@th@ @iidlei ig by @ieans of ii-eir- side or insi o @caiiv ' 's@kep@@elean 6,t nee e ciila.r plate or disk -39.. The disk 39 hU an all times. 'Suppo ariaul@ar water chan @nel 40 *hi@ch is ;cld8ed tted at the t6p of the housina 11 is at it's t.op b-@ me@Lns - @of an, annul,ar'.- cglstiiik 6, diivi@i motor; for @the, @ spindle iS. @ 17 6 41@ @ecured t'o the be.@-ring b - raeket 17@. :At, for: and have shown an'e'le-etric @motor 60 @o 'ide: the: -casting 41. i foi-ined! wil@h a. 0 6 s s duct'42 7 to wliieh"' :con'n(@oied: : ater P' o is w w IP 43.. IV@,tt'r fro@a the'pipe pa,&ses,thi -ough the e duct@42@iiiito the-chann6l@:40!wher'e:it is@'dis-' 10 tributed eircunif@reniiitlly. From th6 cha,n@nOl 40 - the water passes to the:wheel-throilgh apertures 44, 44'a)rranged-ai.:i@nterv'als about the- @ eircum.ferenc@. 'Preferibly, in @ord,@t t6@ -p:re-@ent -diay N*i@f6r 'f roin 'reaching the': ball 15 b6aring-@26@ the @9 i'S' Provided with. a pla@te n upward@'proj'ec-@in& 'aniiiila.r flang@ @ 45 @ which @@, 1. 1, t7 I is in c@ ose pro@cimity to -the anntilar @surf a;ce 46 61 the @4I.- - Ift order. to m@ke a li4uid.-se,a,l betWeen:"the:two @djace-iit--sur20 i-he'@surface of ithe, flango 46, is'annu-1-a,r-l,y,gro-ovea@ as iildiiat'ed@ at@ 4@. Preferably the;,-v@h@el 2'is provided with a. -meta.1 bo@.nd @'48 which@ ser.-Ves toi reinforce it aiid c-,trry part of the.: centrifugal stress- aris25 in6, f@om the 'ral)id :iot@tion. iii order to -provide - ag),ai:nst dam6ge % 1 7n' case of bre@,kage of !the wheel andl in order,further t;(@ pr(@,,@ent tii6 fre@ @ es@ape of -wotejr @in@ a-11@;dlrecti6ns, I provide: an aiiniilar g@uard 4() whi6h-, d@pend -S rom: the casting, 41. Preferably the @,gua-rd 30 f is mad6 of sli6@t @meta-I @:and formed @in sections 50; and 51 the@ lower of which-, i " s verci,tdjusta-ble. Th@ gtia.id pr@feiribly also w his 1% t@ii@d section 5@P, at'the, bottbiii hich -fo --flexible@ mat@erip@l s@uch as leaiher. 35 -is: rwed, of As showli:most@o,16ai-ly in Fig. 61 sheet rhot@ul guard: back @of:the wheel to pr6@tect:t,hci vert!cal w,-@y '127 from moisture and dirt. ' Th@- @ --uard is earned b@ th6 t, wheel 4o head and in order that it m-@y adjust its6if ii, aecordanc6 wiih @ertical - movements of tho he,,td it -is mrcdez in, two sectiotis 53 and A-s shown th@ tWo sect . ions are con ne@ted- to the:slide, 13 a-iid; as shown in; Fig. 45 3 there is a slotted conn@ction 55 wbich por-mits r'olatii,e adjiistiiient 'of 'the guard See@tions as required. Preferably sh@et mi@tal trips 556 'extend @pwai@d 6@ver the pla,@te@ 15. In :orde@ to rotect the way's, 12 at points p 5o ),bov6 the hetid; I, provid6 a caiivas g@ai-d'56 -w hich is ecui-ed:&t@oi!6 6rid t4i@the upper:part of the head acnd wl@ich e@f6i@ds' up-w-@r,'dl: I . b@ackw@-rd-@ and-@ doi@-tward ' over:rollel@s 5@ and At dt@p-@ 6nd bf the, ca'n-@a@ is a.,-cou-n56 -terweigbt 59. it @ will 'be @sec'n that -this -coiit'- -:@... @. I . I I I str@d6tion! i siieh - t.fiat:tho, caiivas autom,,ttida@lly adj-Lists itsolf to'diff@@@li@t p6sitioil of s @th;e hetd. It h@ '' heret6fdr@ been proposed S@ prov'd -i6 e-.a,,c@d-ii@T@,s giiard w hich;is:wo@uiid 60 upon: and unwoiind: @fr@om- @@a r6ll -,but thi@eqnstruction,is obj'ectione@ble for. the,re,is0ii @th:@t@ in rolling'dirt i's transferr@d from < oni@ sid6 6f the:,tan' -f6@ t-he 6ther ahd @in this I @yas e-,,@t6h @es@ @@ th6'i'b ,i,y- @ finall@r er@rtn@ @LirfAce. 65 With my improved construotion. the back Arr@n,, d with its drive 'haft@ivertical and s in a-li nement 'with the spi' @alo, but it will be tincleisto6cl tliat so: ia. som r a@ e, of @he, fea:tures o'f -the'invetition are concerne(l, some 6th6@ forfti of@ d@iviiig mo@oi@@mioht b6 sul@- --76 -gtiiuted'. When@ aii:electric'm@'6tortis@used,the contro'ller - theref6,r @'an convenientlv bo mounted on @the:frame 11 as shown at: 60a. As illti'strat@d@ the h6u@ing 11@ is: e'xtend@d tow-ara ;the @@ fron@ boih sictes iii@ @the fori)@ 96 ,tt of win 61., (il. --R@sting upoii:@and bridging gs these two'wings is til @a.p.l@late, 62 to which tli6: frame of the Motor is. secilred. drive sbiift 63 of th'e i-Aotor pr(5jects 4ow,nwar7d and enters the sp-indle 18 which @6 -is..mad@b holl6w to @roceive ii.@ @Slirr6undii@g @th6- hF(,ft 63 is a couplin@g, 64 foi 6onnecting the@@@shA',ft;.,with the spindle 18. Th6 driving e ent'65 n- i sp@lined to@@the @haft@63 t in t6 be, m; ed QV, 90 vertically ad and. N@ith th spiiidle @without nio-@ing'the shaft, 63 and Without intei-foring with'the, power conneeticii. : As sh6;wn @in@ Fi@,l 8@ the @liaft :63 is with w pr6via-ed t kevwa;-vs @ into -,which @are 05 @fitt@-,a ke'3,s 66 @c,--i.rjried by the driviiio @lement 65 of the couplino, T . he driven efement@67 6f th@ e'aLipliii@, i@ ri@@idly secur6d @ th to @6 iippi?t:end o,of the spindle, 18 ancl, pro fetably the "driving z" ana driven @ lement@ !,I flox bl' e re I y 100 -c@o-nnect@d in otdet to@ 6ompensat& -f or'minor in@e6urt6i@s@ of @ alinemeiit a@nd. @in' orde @r @ to piovide@'a resilierit connecti6n bet-@ve,6n tbe, o6 d thi2@ wheel. P ferably I pi6vide, m r an re @- 6; co nnectioln 'of the pin ftiid belt 5 typ@ tteh as is shown, iii Fi,-@. 9. This eciin@eota'on:,'c,ompriges, -a sOi6ies 6f *s 68.projectiiig @ dow 'navard from the drivirig elem@nt@ 65 -and a se . ries: ()f @'pfiis @9 pro'jc@;(,,ting upward ffom; the driien @elemen,@ @ 67. Int6rlaced 110 lbA6k and forth ar6und these pins is aii endless belt 70, preferably- forined of leathor. :It will @be seen that tho constrii6tion which 1,.have P@6vided 6n,,tble the Weigh 6f the t 'm6ior to'be e'arr@ie'd, di@e6tly b' the m,,tin y 1:15 @-T@arh6 c,@stihi@s i@ithout interf-6tin(y in'@ an y :wa NIT the f're@e vettic,@l MO y,,@ ith: veme:nts ' o@f 'the whe'el hetcl@,@and the ),vhee'l.''The -wheel eac and, @ the i),' @irts there.fo@@ b @ m n 120 I elcin . li,,ht@r tb,,a 6therwise'@,"Toul.d ' be, 'iiecessary, c@nd b6, rio-idly h6ld@'Without tuy iiiteiference aris.the Wei(yht o @6m the - vibratioii @r@m' r f r, of @-th-6 ot6'.: Tho, dtivi@g mecha-nis'm 'for' the ta@ble- is @1:25 -16crited below@ the t,,tble' and I chiefl within y the main frame or'hoiisino, 3. The,main @haft 71- of the d@ivin h projects g rnec at- th6 left ide "of the @ m,,ichine and Ic@6s6ly rnounted on this shaft is a belt pulley '72.- iso

passes@over@.and around these two, pulleys, being guid6d by, - idler pulleys 7 @ 5 afid 76 carried by brackets formed on or carried by the cap plate 62. As sbown in @ F -1g., 10 the base f'rame 3 is provided at its left-hand side@ with, a large apertuie in which ther6 is @positioned@ a cas10 ing 77 fo@ containing,parts of the,driving @mechain.isni. This casing is bolted or,otherwise connected. to the :frame@ 3, alad lies portly inside the frame and partly oiitside. The, aforesaid sh,,ift,,7,1 is fitte(I in beitrings .1@ in the casing 77. The belt pulley 't2 is se;@The drive shaft of the motor '60' is, l@r6@ -SPeed shif . t,,Il aiid- be,@@i!otate4 at ariv one 1 66 vided with a belt pulley 73 and a belt 74 of four.spee(is, as deFired."@'. -Socured to the shaft. 94 is aibevel-gear 100@ w- hich, 'meshes with @ a bevel gear 101 se !cured, to 4 @ vertical shaft 102.' This' shaft 02@@is @ ount din a bea,ring.@sl eve 103 car70 m , e ried by tb.6 main, frame@ 3. @ The , shf@ft: 102 le'arries,- at its. uppet,.end a pinion,104@-:.which niesh - ith the @niiular@gear. 6 alread es w y referred to as connecte d@to @the table li l@ this way poiver is. tr,,tnsmitte d@- to.rotate the table. 75 In@ order that@ @ the @, opei7ato r ma onven ientlystart.,kn d -stop the@- table@ 1, th@re@ is @prov . ided a,@:foot 't eadle:.1 05 af' the, right" r hand side of the machine. The foot cured to a sleeve 78@ which is rotatable on -is: oarried by @ a hori ontal: sle @ e 106 which 80 z eV the shaft 71. The sleeve 78 ig,adapted.,to is rotatable.on@@the -main frame.. This @sleeve@ be connected to the shaft 71 by means of is.'. coni@ee-ted;@with carries an anii 106a which a friction olutch T9 of the m@l.tiple@ disk ,t , vertical: link 107 .At its - up per. eiid:;the 720 or Weston type. For operating the clutch li.nk , is: connected with-,. a @bellcrank @-lev6r there is provided a sleeve 80 iii6unted on 108. The bell-crank@lever is pivoted to the 85 the sleeve 78'and provided with an axinular maih franie t @109: and @the other - rm. I of,t a a he e 81 A. forked lever 82'is pivctally lever is. conne tedi @wit-h @th fore groov c e 0; said@@link mounte,d on the casing 77., and is provided 83. -It will be, seen @.that. the 0 a by-@ etions fitting the cyroove- 81. A pressing downward; on the foot Per tor 25 with pr6je treadle ior@ link 83 is connected to the leiter 82@And by can tensi6n the link 83 a @thu 90 s -pte8s to - nd t @means of the link and the lever the sleeve gether the clements.@,of @ he clutch @T9 and 81 can be moved in, one. directi6n or @ the start the transmi sion of power to the table. r -By releasing the foot..tread-le tlie@ el t, other to fo ce the disks togetlier or, release u ch ele8:0 them and:thus connect the sh-aft 71 with- nts -9;re pe m" rmitted to @se,prirate aiid thiis the driving, pulley or disconnect it there- interrllpt.the, power transmission. Iii order 95 from. that@the foot treadle inay be held down Secured to.the shaft 71 is a. pinion 84 mechanic Ily when desi-r@d, I @ pi-ovid-e a a latch 1 e,@mai@ ft@fno at Ill @which meshes with a gear 85 @igidly secured 10 @pivoted to th to a shaft 86 parallel to the shaft 71 and and @ ada-pted; to @ be swung @ @]@nto p6sition also mounted in bearings in the casing: 77. to etiga the. top of the tre@,dle @ an(! hold - it '1'00 Ile Also rigidly secured @: to the, shaft 86 are down.@ Prefer,,ibly there is 9@ sprin@-p@essed oth6t gears 87, 88 and 89 of progressively plunger 1,12. for-,engaging the @latch 110 @to @maller diameters. These gears 85 87 8@ @hold,'it either out@@of @or i n operat ve -@Voand 89 are in mesh respectively with geitrs it' n ao, 4 i d. . :8 lo es r.e 90 91, 92 and 93 which,are@loosely m6untecl The following @M(@chanism is provided,@ i,05: 0 on a shaft 94 which also is parallel to the enable the opei.@ator standing 'at the i,i(ybt-' ,sbafts 71 and 86 and@ which a]8o ha,s , bear- b.and side of the.. machin.e to, .@ontroi'@'i@e. inos in the casing 7@. The shaft 94 is holchange-sp-,-ed oearing to ch .ige the speed of. e@ all low and longitudinally slidable within this rot,,itioti@ of tl@e table. A@ sleeve 113 is, slidh e s h -Shaft is a rod 95 carrying a pivoted key. 96 ,ibl@ mounted on @the @ sh,,tf 94. Taft is l@10 which is,normally pressed outward through provided with two opposit'e slots 114 and a a slot 96a in the shaft 94, as show-n - in Fig. pili, 115 extends tlirough these slots and @eQne e, 0 131 by means of a:,, spring 97. The@ hubs of n ets:the slee e@ 113 with th a,foresaid r d the. gears 90, 91, 92 @ind 93 are provided 95. The sleirve.is provided@with a@ series with key A'@es, so formed as to, prov c ways 98. By mo-@ing the rod 95 orolp id' 115 longitudinally the key 96 can be brought ridges 116 ibetave@@ tber@@ ,@iiieh are in,tl-le into a posiiion opposite,any one of the:- f6rin of ,ear teeth. @ Meshing with th6; angears and will be moved7@into one of the nular g@.ar teeth 116@ is a, pinion 117 c-,iri-ied 55 kgy ways of that. oear::by means of the by a:-Verticgl shaft,118., - This sliaft is rota99 are int .spring. @ Rings 99, - erposed be table iri bearinffs ca@rried by the,main, fraine l@O tween the gears to separate them and to @and@ has secured to it. ftt it -tipper end- i bevel swino, -the K6y@ 96 inward @ while @it is being. @@inion il@. TI@isbeveli pinion 119 m6sbes moved from one gear to the next, thus@ pre- with a bevel ge,,tr.120@o@@a horizont,,il@@ @aft, 60 ..Ventilig it f@om engaging t*o gears at the 121 rnounted in suitable bearings in the.m,,iin , @-,ame time. It will be c ear t at the mechframe. This . shaft 121 extends outwa@rd@ to 125 anism which I have described constitiites the right of the machine where it is provided a chan@e-speed gearing whereby the shaft with @a, hand @; lever i@2 -- @avirIK a sprinly@94 may@ receive.power from the,constant pressed locking plunger 123. Mounted a

1,392,325, jgcent the, lever 122 is a segment plate 124 ha-,,inu fcur -1- i6les 125 -125. It will be seen that the ope.-a,tor, by moa,ingy,the levei- @l@2O@, cap- tlirn the,@hafts 121 and 118 and in this wdv nioATe . tl-ie sloeve 113 longitudinally. TI@e@s!6eve 113,is coniaected as ali-e,,tdy describ6d, v@ith the rod 95 and thiis @vith the key 96. Lonb-itudin,,tl@movement of the kel@ serlTQs tD eiioage it )Vltl-l one or ,tn6ther of lo, the &ears c@0, 91 92 ahd 93 as al.rehdy describ'@ed. The @o'les 12.5, 125 iii the s=t 124 are spaced in accordance I with t I -. er,il opei@ative positicns of the key 96. The sprino--pressed pl.unoer 193 can be e'ntered 15 in one @ or aiiotlier 'oipthe holes 125 and tlitis serves to lock the li:ey 96 in one, or ,tnother of its 6@erative positioii@. It will be clear th,@Lt by raeans of this niechanism the opera-@ or c,,tn el-iange the fable speed i@ desired. 20 it @vill b4a -Linderstood that oi,dina,ril@ it is better to releqse the cliitch @9 before adjusting the change -speed ge,,iring. The shaft -94- is extended towatd tl-ie riolit and fits ,i bearing 126 in the main frame 3. 25 At its ri(_,ht-haiid end the shaft carries aL. bei,e,l gear 127 which meshes -vvith a bevel ge,tr 128 c6nn I ected to t short inclined shaft. 129; 1The sliaft 129 has a bearin@, in a; housing 130 formed at the side of the machiiie, 3o this ho-Lisiiig witli its cover 131 inclosing the two gears 127 and 128. The geariiio- and other devices for control]@ing the wheel feed are mounted in a c,,isin(y i32 secui-ed to the right-hand side of tb@e 35 fi@anie housiiig 11. Rot,,Ltably mounted in a bearin,y biishin(y 133 which extends throug)il ,t itvall of the casiing, is ,t short shaft 134 approxiii-i'@itely in .1 :ilinement with the ,iforesE Iii(I sh,,tft 19,9. The two shqfts 129 and 134 ai-e 40 coiinected by i-iieans of ,t shaft 135 ivhicli is flexibl-), engaged with the said sh,,i:fts @Lt its ends. ',AS. shown, each of the sliafts 129 aii(i 134 cirri6s a @sleeve 136 qcross which exten(Is a piii 137. Each end of the shtft 135 is slot-. 45 ted to !receive the correspandiiia pin 13't. Bein@@ thus connected, the, shaft 135 serves to tran.smit poaver from the shaft 19,9 to the sh,qft, 134 blit the connection is sufficientlv flexible to permit the sl-i,,tfts 129 and 134 to@ 5o be sli(ylitly olit of alidement. Thp, shift 134 ctrries ,tt its up@er en(i t bevel I)Inio,n @138 Nvhlch mesh6s with'a @t-)evel "eAj- 139 a,t the inner: end of i, traT)sATei-se hori7ontal sh.,,tft 140 At'the outer end:of 55 the s]-iift 140@is a cranli: 141 Wlii6h is connected by a link 142 Avith a 6t-,tnk 143 on It rock shaft 144. The rock sh,,tft @144 is motinted in t bearing iii the, casing tnd exfeiids outwa,rd through the wall of the cas60, iilg. A/foLinted Lipon the outer e-nd of the shpft 144 is -,t crank'arm 145 1-ia-ving a loii--ittidin,,tl slot @ therein. , TI-ie colinections are Rot@atably mountecl in the upper part of th6 c ing 132 is a ti,tdsverse horizontal a@S sh'aft-146 ivhich citrries @t its out@r 6nd a band -wheel 14@. M6Linted on the 8liaf-t adj ac.ent the hand wheel is a liub 148 -,,vhi dh has 70 secured to i@. a. rin, 149 provided with ratchet teeth and ,t ring 150 provided with -@adu@tions 151 @s sh6wn iii. Figs. 20 and 21,. - Positioned between these two rings l 149 @nd @150 is a @thi.rd ring 152 which friction-- 75 ,tlly en.gages the h-Lib 148 and i,s rotatable thereon. Loosely inounted on the shaft 146 is a roleker arm 153 ca:rryiiig a pa,-,@rl 154, which is adtpted to enoage the ratchet teeth on the ring 149. By means of ,L @pring-@ 80 pressed Plunger 155 the pawl 154 may be@ held 6ither in or out of enaagement -,",ith the, rat het teeth.' The rocke@r trm 153 @is cone nected by means of a, Ilink 156 with the afores,,tid crank arm@145. The connection 85 between the link and the ef,,tnk trm is an It 0 I @justable one, there being pr vided a,pivot pin 15@ which is movable longitudiiially of the crank arm in the, slot thereiii. pi'vot pin ca.n be clamped in adjusted p i n by go means of the knob 158. From the foregoing descriptioii it will be cle,,tr that the rotative movement of the sh,,tft 134 serves to osaillati@ the shaft 144 which in turn ser . ves by means of the corinections de- 95 scribed, to oscillate the arm 153 to a -reater or less extent, as desired. The pawl 154 on the arm 153 by its engayei-tient with the ratch et te6th; serves to i mitte ntly turn the shaft 146. 100 Th e ring 152 is@ split as shown@ in Fig. 20 and is 'frictionall@ connected with the hiib 148 and thus with the shaft 146. This ring has a projection 159 which is adapted to enga ge a pivoted finger 160 projecting out- 105 w,,tr d from the casing 132. The projection 159 has a handle 16i. The finger 160 also ser I ves as a pointer to co6perate with the. scale 151 on tb.e ring 150. Connected to the ring 150 is a small arcuate plate 162 ivhich 110 proj ects over the ratchet ring 149@ 6,hd ColTe rs som e of the teeth thereof. This plate@serves at certain times as will be hereinafter ex@lai ned, to hold the pawl out of engageraent with the ratchet te6th. - 115 Mo unted on the sh,,tft 146 is a pinion 163 whic h meshes with a gear wheel 164 on' the hori zontal haft 165 pata.Ilel to the shaft 146 and mounted in bearings in the casino- 132. The shaft 165 carries a pinion 166 mhich 120 mes hes with a gear 167 on a shaft 168. The shaft 168 is mounted at one ehd in % bearing 169 carried by the casing 132; From; the bear ing the shaft extends to-ward the left whe re it is supported in a bearing 170 in the 125 main housing ii. At the left hand end of - the shaft is a bevel pinion 171 -which meshes s-,ich that I-lber I is ti) roxiriiately olie comwith a bevel gear 172 at the loiver end of the e _ p i-)Iet" (SCIIIation of the crank ,t,rm for each feed screw 21. The feed liscrew! is held 65 revoliition of the table. again@t vertical movement by means of 130

thrus@ bearings 173 and 174, and tl-i6 re@ult is that when the screw is turned by means of the shaft 168 a.nd the ge,,trin- the head 14 with the wheel 2 is rai.sed or low,ered. The aforesaid pinion 163 is preferably loosely mounted oil the shltft 146 and is conne.cti6le ther6Avith by me,,tns of a toothedclutch 175. The.-Celdtively movable element of this lut -c ch is an annul arly grooved coll,,Lr io 176 whicli is gplined on the 8haft ,ind which is: longitudinally movable ui-ider the' control of a, bell-crank lever 177. This lever is pivoted to the casing 182 at I't8. Exfending across the casin- 132 at right angles to the iL5 shaft i46 is a, hor"izontal rock shaft. 179 -@vhich carries at its front end a hand lever 180. Projecting upward from the rock sh,,tft 179 is an arm 181 having at its upper ei@d a, notch adapted t6 receive a roller 182@ on tt-ie, 20 bell-crank lever 177. When the arm 180 is upright, as shown the roller is entered in the notch a@d the.elements of the cl@tch 175 are engaged. When the rock shaft 179 is m.oved to swing the arm 180 in either direction, the 25 roller 182 is forced upward, thus separating the elernents of the clutch.: Mounted iii the casing 132 parallel to the shaftSI46andl65isalshaft.183. Thiss@aflt extends entirely across the housin 11 and so is supported at thp- opposite@side in a bearIng 184. At the left-hand end of the sh,,tft there is a belt wheel 185 which is in alitiement with a belt wheel 186 prefera.bly formed integrally with the belt ivheel 72 35 on the shaft 71. A belt 187 passes over these two pulleys and thus serves to constantly drive the@shaft 183. Loosely mounted on the shaft 183 are, two gear wheels 188 and 189@ The gear wheel 188 meshes with the afore40 said gear wheel 164 on the shaft 168 and the gear )vheel 189 meshes -",ith an idler pinion 190 which iiii turn meshes witli a aear 191 on the shaft 165. Clutches are provided: whereby either of the gmrs 188 or 189 may 45 be O]peiatively connected with the shaft 183@' Slid-,tble on the shaft 183 is a. clutch collar 192 which is adapted to,be moved in either direction bv means of a forked lei,er 193 ctrriea by Ith'e aforesaid rock shaft l@9. TI-ie 5o shaft 183 is hollow, as shown in Fig. 25, and slidable @in the central aperture thereof is a rod 194. A pin 195 extends tlirough the slots in the shaft 183 and -connects the rod 194 Nvith the collar 192. The gears 188 and b5 189 have connected to them respectively disl<s 196 and 19@ which are provided with ,tnnular flfinoes which extend toward each other. As shown in Fio, 26 there ispositioned within each annular flange an ex60 pansible ring 198 adapted to be expanded into frictional engagement with the fl,,inoe by means of a rocker lea,er 199 positioned @vitliin @a collar 200 carried by the shaft. For nioving the lever there is a plun er 201 which 65 project@s inward through an aperture, in t]@4e, shaft. Thi pliinger'201 has a frusto-coiiical point which is tdapted to be engaged by the frusto-conic,,tl point of a screw 202 carried b@@the af6relsaid @lidable rod 194. When the rod 194 is in its central@ po@ition, ag shown 7-0 in@ Fi 25 the two scrow 202 ate ovit of g. engagement -vvith the plun(yers 201 and both of the clutches are@dise By moving. the tod'194 in 0 d' other ne i or the, either clutch may be engaged, as desired. As 75 already stated, the rock lever 193 -,vhich serves to move the rod 194 is carried by the same ro'eker sh,,Lft 191 Nvhich carries the lever 180. . Therefore when th sh ft is in its e a central position, the two geai-s 188 and 189:soare loose on the shaft 183 ,tnd the clutch 175 i8 engaged. When the rocker shaft is moved to connect either of the gears 188 or 189 witl-i the shaft 183, the clutch 175 is simultaneO-Lislyop6n6d. Preferably,inorderthatthe@85 h-@tnd lei@er 180 m,,ty be h@ld in any one of its three.operative po'sitions, it is pr6vided with a, spring-pressed plunger 203 which is adapted to enter any one of three, holes formed in a late 204. 90 The 189 r u - sed for MO -Vgears 188 and a e iiig the wheel head rapidly u,pw,,trd or downward, whereas the i-atchei an'd pawl mechanism is used for the norinal slow feeding mov6ment. It will be clear that by means 95 of the lever 180 the operator can control the movement of the head, being able to cause it to inove rapidly -LipAvard or rapidly down-vv,,trd or to be moved slowly downward for feeding. When. the gear i88 is connected, 1,00 ponver is transmitted to m6ve the hetid downY,,ard and Nvhen the geat 189 is connected ponver is transmittled to -move the head @ upAvafd. Pr'efer,,tbly,, in order to prevent the 6p@r- 105 ator from inftdvertently attempting to raise or lower the head too far, I provide an aiit6- matic safety device. As shown, the hand leve 18 r 0 is- extended toivard the lelft and has connected mith it ,t link 205 Nvhich extends 110 Lipward and which is conifected at its upper end to ,t bell-crank lever,206 pivoted on the housing 11. From the other arm of the bell6ranl< l@ver there, extends toward the- left a, horizontal link 207. This link tt its left- 115 hand end is coiinee'ted with a bell-crank lever 208 also ivoted on the housing 11. The p other ,irm of this be,,Il-crank lever 208 is positioned in the path of st6ps 209 and 210 Ic,,irried by the slide 13. Preferably the up- lao per stop 210 is adjustable vertica,lly in a T-slot extending alona the edge of the slide. It will be seen that Yf the head 14 is perrnitted to move downward ilielil)per stop 210 will en . gtge the bell crank,lever 208 and will 125 sw,no@ the hand lever 180 in the counterclockwise directi6n and thus disengage tl-i6 gear wheel 188 from the sh,,tit 183. f ihe wheel head be moved u ward the stop 209 p will engage tlio bell-erank lever 208 and 13o

will swiiig the hand@ levertl8O@ in@ the, clock-, wise@ @ dire6tion, thus disengaging the gear 189 from @the shaft 183i Preferably, in. order to prevent the @ escape of water@ and to- pr tect the ol)erator,@ there is. provide'd 'a (,Yuard which extends. around -the table,l ,m,d: the wheel 2@ One side of the giiard y @ m uhted ,is permanentil 0, in position as shown,at 211, in Figs. 1, 2, @@4 1.0 and ,5. 'At th,e other side of the@ guard, preferabi,y at t-he:rioht-htnd side, - there are swinging.,doors 212. and 213..which permit tho, ta the operator to have access to. ble for the purpose of removing.finislied work@ and 15 putting.. on new work., These, doors 212 and 218. are piv,oted respectivel v , at 214 and, 215 and are provided wlih lat@hes 216i @216 -by means.of 'w ch they may.be-heldin closed: positions. 20 I h,@ve tlready referred@to the@ table 1 as being aoapted : to support and the parts to be ground. , I do, not limit myself to one, for,m, 6f table but @ I pr efer to, A p@imp, is provided -,it' tbe' rear end, of,the@ speeds 25 The electrical de@tails of the chuck c6nstitute no @art of my invention aiid. are not herein shown. It will be observed, howev(,,r' that current is supplied to the,chiiek@throuLh, a cable 217 shown in Fig..2. The cable c,,tr30 ries two conductors whi@h@are.connected@re_ spectively to the brushes 218 ahd 210. , 'These brushe@ enga@,e respectively with coii4uci6r ring@s 220 an5 221 -carried by the table or chuck at its lower. side. P ably the ch ck 35 refer ii, in@'addiiion t@ beid(y vid cally holj-' pro ed with coils for magneti ing the. ork,.is. al 6 provid6d with radi'll W T-@lots 222 which may be used either for ii@echdnically holdin@, the work or -for nie40 chaiiid@lly h6lding guides or sto@s v@hich serve to position ihe wotk. This combined mechaiiical and electrical shuck is not here'in claiined as part of this@ invention but is set forth and claimed in ihy copehding ap4,5 lilic,,ttion for chiiclcs, S@ri,@l l@o. 247 635, filed oh even date herewith. As already stated wat6r is sti@plied io t@e grindino, wheel thkough th6 pipe 43. This wat4@r r,@ay be ,3up@lied fr6m any de@ired-@ r) 0. source,, but I preferably provide: a wateir eiretilatijig system which is a permanent 't 6f the r@llc'hlne. ' As:shown ini Fi,@@l-. 4 P"I there is provide'd a tank 223 at the i6fth,i,nd s ide of the machine - connecti@d to :the 55 ba8e frame 3.' The tr6ijoh o@ outter formed @y the flange loa iS @@t ;t,he left extended toILn e S(-h@troed from ward the rear d wit r is di the trough iiito the tank through an apertiire 224. Preferably @uitable I StTalin@rs or .6o filters 224a are provided in the upper part of the tanli: to remove from th@- -@vater any for7 6ign m@itt I er such. as abraded material'from: the whe'ol o@ from- 'the' meta;l b,@in(,, @,,t6uind. tank,. which @is:preferiblv @of the centrifugal 65 type, beib,& located qt, the@ bottom of the tank and rotatable about a,ve@tOcal,axis. @ In F'lg. 27.@ the pum'p fasing is ind3'Cated. by 225 and the @fotor by 226., The@ rotor is @ secured. to the end of a@vertic,,tl.shaft,22.7-which,at its,u 70 p@ p@r, end is connected @with a horizontal shaft 228 b , means, of@ @ bevel . gearing. 229. The y shaft 228 carries a @ @elt puliey. 230 @wliich@. is in ,ilinement wi-th the aforlesaid belt pul163,s 185,,,tnd 186.: P.referably the,same,beit 7,5 187 which @ passes over the. pull s 185 @ and, e-Y 186' is @extended to also pass over the pulley . 230, as indicat6d by dotted lines iii Fig. 5.1 For, guidipg @.the. belt 187 there is. pr4c) @ided a, supoleniental idler piill@y @31 carried b.y; a- bracket pro,jecting, fi6i@, the housing 11. EA Ntending upward from the. pump is a pipe232 which is connected with a pipe 233 extending@,for-,i@ard as shov@,n by dotted lines in-Fig.,b. T,Iie pipe 23','@ is.p@oVid,@dlat 234 95' with,,,t v4lve. : Thi s. yal@e 7 is connected with a shaft 235 -which,extends entirel@ across the 9 hand end lever @ 236. ' @Beyond the valve 234- ther!3 is -,t flexible pipe 237 9 0 -,@vhich extends to and is o' n ' d c n ecte with the. afo.resaid.suppl pi e,43. y p :Frb'm t,he foregoin- description it'will begeen that the pllmp. is c@ntiiiuously operated an(i c'Ontinuously,niaintains a'piessure in the@ 95' pipes 232 @,nd, 233. B-v means of the le'vor 236.the op.erator can open or close'the valve, 'Lis :sup p y wat e o the whe el or 234'and fh j7 t e I sh'iit it off as desir d. In operation assimino, that a' large num-@ 160 ber of pieces of the,same 6!iaracter are to be g . roun(-I, the stop 210 is so adjusted that it wil.1 prev@nt the wheel from' being moved@ do,%Ivnward into engagement with the work by ineans 6f the high speed connection 165 tlir6u@,h the 8haft-183. The pieces ''to be ground aro lb:ided onto the table which @ i use a iable in the form:of a, magnetic chuck., niachine:@nd7 has conn@ected to. it at its ri htpreferibly rotat6d' lo@dino, to make t)ie o'pera't'l'on. 'more..Oonvenieni@ f@r. the op@ra,tor. Du'@ih'o'@ @loadli@@ the bperator can 110 n-i@@ually'c()Iitr@@ol-the spoed of table rotation b -me@ins. "of th-e f6ot tre"adle 105. , He' can h'ol'd;the treadle-down ai@d permif the t@ble to rotate -at full speed 6@ if he finds that he 'c',@n not lodd fa t enough to keep up with 115 t@l@i@@fiill speed, he can rel6ase the treadle hnd permj:t ' the'table to stop. If @referred, th'e operator can@ b@ properly .,re,-ulating the pressiire on the treadle, run tho table at an intermediate. S]pee,d which i ,tdapted to the 120 -1 a;din It will be: h6ted that th' speed of 0 is 9. control of the spee,d by means of the treadle 105 is entirely 8upplemental@to the normal speed'adjustineht which is effected by means of th6@hand lever,122. By means of this hiind lev@erithe ohhiige-speed geafing @ah be so'connebt@d a to give any one of the four may be @depmed:Dreferqble@ in

g3 accordance with the character @of the work, is carried undernitath the,pawl to throw it the amount of metal to be @removed, the nature of the material, etc. @After' the t:ible is 16aded and the foot treadle is locked in @ its lowermost position by means of the latch 110 the operator may then bring the gtinding wheel approxim @ ly i to inding position I)y means of ate n gr the rapid traverse connection wfiich is conlo ti;Olled by the lever 180. The aforesaid stop 210 prevents the operator from accidentally moving the 8vheel too far do*nward@ The, machine is now ready for grinding fl w 6f waand the 6perator can start the 0 i5 ter t6'the interior of the wheel by turning the leier 236 to ol pen the valve. Then the operatoi-, by meam of the hand,wheel 147, can lower the wheel into engag),ement with the woik@ it being understood that the pawl 20 154 is first,thrown out of engagement with the ratchet wheel 149. The operator gages in the work from time to time to ascerta when it is gr6und to the required thickness. It :will be observed that as the wheel is 25@ turned the iring 152 is carried with it until the proj'ection 159 engages th@ stop 160. Continued movement of the hand wheel caus i 6n the ]@ub 148, the es the ring @o SI P. projection remaining in engag)lem6nt with 3o@ th stop. After the worl@ is groiand to size e the o-perator raises th6 wheel by turning the hand@wheel in the, reverse direction. Usually a fraction of a turn of the hand wheel is sufficient and in this case the projection I 35 159 does. not engage the top 160 on the backward movement. But if ihe stop is engaged it is simply swu-ng upward on its Rivot witholit disturbing the setting of the ring 152. 40@ The finished work is remo@,ed from the table 'and a new lot of unground pieces is put in place, as allready described. The operator then again engaces the grindiiig wheel with ihe work by turning the hand .45 wheel, as before,. )Vhen ihe projection 159 ens th@ stop 16() th6 operator knows that gage! the work is grouiid ap@roximatel 7, to size, thoiigh there may be a. slight variation because 6f wear of tl,6 nding wheel. The 50 operator can feed gri ard the wheel, dowlnw such supplemeiital @distance as may be requir(,d, ai@d this distanee can be accurately determined by means 4)f the graduations on the ring 1,5f in coi5peration with the stop 160 .55 which also acts as a@ pointer. In the operation thus far described the feed is effected entirely by hand. The Inachine is equally well adapted for power feeding, this beink effected by means of the 60 ratchet 154 the ratchet wheel 149 and I the several other parts which have already been fully described. For power :feeding, the stop 160 is thrown to its inioperative porition, as shown in Fig. 18. 'The ring 152 is 65 so adjusted on the hub 148 that the plate 162 ou.t. of operation when the work is'grou_nd to the approximately @rop er thlc'kness. This construction permits the wheel to operate without the undivided attention of the 70 operator, and the automati6@ throw-out: for the pawl prevents the feeding from beiiig continued so as to injure the work. @lf after the power feeding h@s stopped it is: found that supplemental feeding is necessary because of the wear of:the@wheel,@this can be effectied manually by means of -the hand wheel 147 What I