Jan. >7, l1947. R. J. SHARP I 2,413,793 VERTICAL AXIS TYPE MIXING AND CHASING MILL Filed Feb. 28, 1944 2 sheets-sheet 1 ` v,AlTToßzA/Ey. Jan. 7, 1947. R, J, SHARP ' 2,413,793 - VERTICAL AXIS TYPE MIXING AND CHASING »MILL Filed Feb.4 28, 1944 ' 2 sheets-sheet 2 f 4 "l 'ply/49177 RE/vw/CK Il SHA/Ef?. INVENTOR. ATTO RNISY '2,413,793 Patented Jan. 7, 1947 UNITED STATES PATENT UFFICE 2,413,793 ‘VERTICALCHASING AXIS TYPE MILL MIXING Renwick J. Sharp, Guatemala-_Guatemala Appiication February 28, 19411,*Sgerìa‘l No. ‘524,247 ( Cl. 3241-123.) -2 This invention relates Vto a >mixing and grind lng machine. The embodiments of the invention shown in the drawings and hereinafter described are more »Among other objects of the invention are: to provide improved »means for >imparting Ya come bined glyrvatory „androtational rmovement to a crushing `and grinding rol-ler, in combination vwith vthe interior surface of a container with which it particularly intended for use in crushing and cooperates in performing .the Crushing and~gri-nd« mixing together the ingredients of a chocolate ing operation, so that one part of the «roller will containing confection, but it is to be understood be vbest adapted V.to «crush the softer lumps or that, without exceeding the scope of the inven fragments lof v»the mixture ybeing »fed 'to Ithe ma tion »as hereinafter claimed, it is capableof Vari ous additional embodiments adapting it'for use 10 chine, «While Aanother «part of `the `roller will be best adapted-to crush the harder ‘lumps Áor `frag~ in -a variety of other industries, such,jfor exam ments in the material being treated; toprovide ple, as in paint industries. Ain'iproved Varrangement «of scraping devices Hereto-Íore, difficulty has been encountered in which willv continuously f-ree't'ne solid >portions of grinding up. îgugar-containing chocolate in a rap' »the material being treated from the walls of the i‘l, satisfactory manner, because the 'heat _gener containerprovided therefor,v and at the same -ated by ¿such Vgrinding _causes caram‘elization of vtime ‘to cause the scrapedoif material to be con the sugar; and only `theunsweetened chocolate tinually lfzept in xcirculation >so asto be more eni »canfbe 'ground between stone mills, since the heat generated by'thern is too high and causes _cara ci-ently acted upon Lby ‘the Acruslfiing means; _to pro melization of the sugar, and in the case of milk 20 vide animpro-ved arrangement of lsprings where powder, which is mostly lactose, this carameliza >the crushing rollers are efficient-ly _continually tion takes _place at even a lower temperature >Vtha-n cane or corn sugar, and therefore, only urged _toward vthetv-all -_of the container, with which~they cooperate, and 4yet are allowed to re cede from~said wa‘ll to the extent required to ing takes "place later, and Where the ~Ollíï style 25 avoid «cloggingthe machine. Anothergand morefspeciñc object `of the inven `Á"Pot»Conges"’ are used _they must be kept Warm tion is to nprovide an ‘improved arrangement vof with >steam or ‘hot water, and _this phase _alone of steel Irolls `are usedto refine _the chocolate. YCong the process sometimes requires as _much as '72 hours constant conging. The conges >as a rule ~frusto~conical crushingjrollers whereby the larger portions~of _said rollers are utilized to more rap consist of a plurality of _huge pots, and each pot 30 -idiys'feed «in and _crush _the softer 'lumps or frag ments of the material while the smaller portions has its stone lroller which moves forwardly and 'of saidrol-lers are utilized >to more slowly feed ‘backwardly being pushed and _pulled 'by A`means -anderushfthe harder portions of the material. of a reciprocating arm operated from the _crank v'Other objectsadvantages and 'features of in 4portion of a shaft. This is a .gentle process, Ibe. vention will hereinafter appear. cause the stone roller only rolls over the thin _ñlm Referring to ,the _accompanying drawings, of chocolate caught underneath, and does `not uwhich _illustrate whatare _at present deemed to twist or gring, for it could no_t be properly »done therwise with the sugars already in the choco be preferred embodiments of ,the invention, 'Figîl ‘is a vertical mid-_section of the complete late. Chocolate with a burnt flavor'is repulsive 40' machine,_a lportion of 'the base, of _the driving to the taste. meansyan'd ¿_i-incertain interior parts being shown Important objects of this invention are: to pro vide a machine that will overcome the foregoing ìîl _eleYâlìÍOl’l `drawbacks b-y 4removing a great deal _of handling FigfZis-a_horizontal,section _taken on line 2_-2 ,OÍ'FigXL of the product; to reduce the amount of ñoor space required for ‘handling the product; to _keep 45 Fig. _Sais a sectional detail taken on line ¿e3 vthe product from so much contact with openair and dust; to reduce cost of’installing the required of- Fig.’2. ' e is a sectional _detail of the vacuum vat equipment, so thatthe _small manufacturer can tachment carried by the cover of the container, `the Vplane of sectionfbeing indicated ~by line â-.-4 make `his own chocolate by the simple process ci compounding -in his own candy factory the 50 _on vFig.' l. Fig. >5 is an enlarged sectional detail of the Yout cocoa and fat which he can obtain locally,.With sugar (powdered) also obtainable locally, Vvand let or delivery portion _of the machine _taken on milk powders, nuts, etc.; and to enable the large scale manufacturer' to avail' himself Yof the same advantages as to the elimination of labor re quired vhandling and amount of door space needed, the invention being well adapted to his , use, also, the machine can be made vvvery large the' number of grinding rollers contained .therein can be increased. f Figs. 6 to'9 illustrate a modiñcation. Fig. 6 is aview showing the'frusto-conical crushing andmixing members togetherwith their driving means, anportion of the casing .being _in c-luded'in -the view. „Portions of this View _are sectioned, asiindicated by line '6a-'6 .on Fig. 7. Fig. l7 is a section of the structure shown in 2,413,793 3 Fig. 6 taken on angular line 'l-l of the latter view. Fig. 8 is an enlarged sectional detail on line 8-8 of Fig. 6. ~ 4 tailed in Fig. 3) is carried by upper and lower horizontal arms 43 and 44, the arm 43 being ñxed to the shaft I3 in an underlying relation to the cover boss 24 and the arm 44 being fixed to the Fig. 9 is a perspective view illustrating the springs and their mounting means whereby the lower end portion of the driving shaft I3. rotary frusto-conical members of Fig~ 6 are urged provided as a means to adjustably secure the scraper 42 to its supporting arms so that its po radially outward into 0r toward contact with the f Clamp screw and slot arrangements 45 are sition may be regulated, as required, to give it a , , Referring in detail, ñrst to Figs. 1 to 5 of the li) proper scraping contact with the side wall of the container. drawings, among the more important of the parts At the opposite side of the shaft I3 the arm shown are: the container I0 furnished with a 44 (through which said shaft extends) is fur supporting base II and having a cover I2, the side wall of the container. nished with a downwardly oiîset extension 46 to which is secured a scraper 41 positioned to scrape vertical operating shaft I3 located centrally of ' said container, the upper cross-arm I4 and lower cross-arm I5, both of said cross-arms having nearly the entire bottom of the container. This their midlength portions secured to said shaft, and the truste-conical spirally grooved members scraper is shown adjustably secured to the arm or extension 46 by means of screw and slot ar I5 which cooperate with the side wall of the con tainer to crush the materials being treated and also aid in mixing together their different in gredients. . The shaft I3 is shown having fixed to its upper end a bevel gear I'I with which meshes a driving rangements 48. The container IB is shown constructed as a tank having a double side wall portion Illa, IIIb and a like double bottom wall Ißc, I?d, thus pro viding within said wall portions water spaces 5I and52. The container’s bottom has a solid cen bevel gear I3, in turn fixed to shaft I9 of motor 25 tral portion 53 through which is tapped a screw threaded bore into which screws upwardly a bear 23 mounted upon a bracket 2I fastened to a ing screw 54 furnished with a lock nut 55, a good wall 22. sized vertical admission bore 56 being provided By preference and as shown the cover I2 is of in axial alinement with said screw, and access to a somewhat domed character. Said cover is pro vided centrally with a stuffing box 23 through 30 the screw being further facilitated by a horizon tal bore 5l which leads from one side of the base which the upper part of the shaft I3 extends, to the upper part of said bore 5B. said cover having below this stuffing box a down The driving shaft I3 and screw 54 axially aline wardly projecting annular boss 24. with -.each other and their adjacent ends each At one side of its center the cover I2 is fur nished with-a tubular intake 25 furnished with 35 contain a concavity, thus providing for interpos ing a bearing ball 60. In order to prevent too rapid a settling of the solid ingredients of the material being operated on in the container, an agitating or stirring pad furnished with a hand-hold 29, said carrier being shown removably fastened to the’tubular part 25 40 dle 5I is provided having a sleeve-like shank 62 whereby it is secured to the shaft I3. This pad by means of winged screws 35. The means for dle is inclined as to its width in such a manner holding the closure 23 in place is illustrated in as to create an upward current through-out that Fig. 1 only, further illustration thereof being portion of the contents of the container upon deemed unnecessary, as it may be varied to suit those skilled in the art, it only being essential 45 which it acts. It is shown positioned superjacent to the scraper 41 so as to cooperate therewith to that the closure plate 2S be attached in such a create an upflow of sediment loosened from the position that its inner face forms a streamline bottom of the container bysaid scraper, and correspondingly curved continuation of the Describing now the preferred mounting means inner surface of the cover I2 so that a scraping for the frusto-conical crushing and mixing mem element may pass thereunder in a smooth, eii'ì- . bers I 6, each of said members has projecting ax cient manner. ially from its upper end a trunnion 65 and down At that side of its center which is opposite to wardly from its lower end a trunnion 66. The the intake means which has been described the cover is furnished with a tubular vacuum ar upper cross-arm I4 has cut into each of its ends rangement 3I having secured to it an air-tight a vertical guide slot 61, and a like slot 63 is cut into each end of the lower cross-arm I5. The cover 32 from which leads a suction pipe 33. Within the tubular part 3l the cover I 2 has upper trunnions engage bearing blocks 63 having through it apertures 34, mostly arranged in rows, working fits in the upper slots El, and the lower see Fig. 4, and superjacent’to these apertures trunnions 65 engage bearing blocks 'I0 having there extend across said part 3I baiiie plates 35, 60 working ñts in the lower slots E8. Each of the to -keep the liquid from being sucked out with the four bearing blocks (69 or 16) is of the same de air or vapor to be extracted.-l ' sign and has a periphery extending through more The container I0 has an outwardly directed than a semicircle thus preventing it from lateral flange 36 around its top, this flange being uti disengagement in relation to the trunnion with lized to receive bolts 3'I whereby said cover I2 which it cooperates. The open side of each of is attached, a gasket 38 being provided for said these bearing blocks is directed away from the driving shaft I3. cover I2. The already mentioned upper cross-arm I4 has The upper blocks 69 have studs 'II surrounded riveted or otherwise secured to it an upwardly by the outer ends of spiral compression springs extending arm 43 which carries a scraper 4I 70 12, and the lower blocks 'I0 have similar studs ’II having a scraping edge contoured to conform to surrounded by the outer ends of like springs 13. the curvature of the underside of the cover I2 All these springs have their inner ends coiled and of the closure plate 25. An additional scrap around studs 'I4 provided for them on the cross ing member 42, see Fig. 2, is provided to scrape arms I4 and I5. The upper bearing blocks are the side wall of the container. This scraper (de 75 supported by flanges I4fand the lower blocks 'I0 a closure plate 26 carried byga handle means which desirably consists of a lid carrier 21 con nected to said closure by arms 28 and externally atravesar SÍ. 6 are supported by inwardly directed bottomflanges ~ tions <of. the.J arcuatetsprin‘g -98.;1 Each term L; I nl! l5fî in the end portions of the cross-bar |51 The bearingblocks 5B and 'Eil all have their carries' an |outwardly‘dire‘cte'd stud> lß5,fand each; bearing v:block vßilßat its sideï of thel structure, car trunnion-receiving recesses positioned ln‘such a v riesa‘ stud |06; thereby providing mountingv meansfor spiral ,compression springs 12a. Most-'lof the parts whichcooperate'with the manner as to, ineiïect, form semi-cylindrical in clined bores through them within which the trun nions ».withï which they cooperate workably fit. lower-:arcuate spring ware constructeduin the same nranneri'as thercorresponding parts alreadt7 described in connection with the. upperispringv IlÍOIlS f In4 the 'lower- right portion of the container (see 10 98, andr` aref therefore. numbered thefsama. but There are lillets lßmaround the bases of the trun Fig. y1)-`is shown an outlet ‘l5 controlled by aver some of these parts are differenti and will now be tically operable door plate l'iöïhaving a vertical rack Tl'ëprojecting from its outer facewhich is engaged by a gear ‘F8’ operated by'a swingable describedusing di'lîerent reference numerals.>> The -lower cross arm- 9i hasalonger central body portionv Hßfand is shown-furnished with handle'lg. An apron Eûgspacedoutwardly from 15 an upwardly'direct‘ed >hub -or'annular rise l i2 the »mouth of the outletl la and extending to a which> carries aset screw H3l for clamping this. point-therebelow, directs downwardly the outiiow cross-bar to the driving shaft i t. ing product. Said apron- (see Fig. 5) carries at The 1 scrapingrand stirring» members 4shownin eachïside avertical attaching flange 8l whereby Figs. 1,»2 land 3 are not shown »in Figs. '7,‘8 and 9, it isJ secured tothe container, said apron being 20 as their constructionV and 'usewis apparent from>> rectangularly shaped-as Viewed in horizontal sec the disclosure'of .the »io’rm'erfvie'ws tion. A pair of spring-pressed casters S2 are In the modification the flower‘bearing blocksi‘iíl shown' having- shank pins 83 extending »slid and their'studslf'llf are unm@dined'à but are engaged ably through openings provided for them in the by theo-ute'r endsof*spiralfcompression springs apron 8G“, these casters engaging `the outer side 25 H5, the innere-nds: ofiisaid springs surrounding of the door 'i6 to reduce the friction incident to bosses íB5ïï(as-above=)' on the lower shiitable arms ' the operation of said door. The liquid-containing space within the double teli. These lower armsare ofi-the same size and shapeias `the corresponding.'y upper ones and, to~ Wall of the container is provided with an inlet gether with their-*fingersilliLa-re therefore let controlled by the «plug itâ-.and with' a bottom out 30 tered the same, -butzthey I'each operate in paired l-et controlled by a plug 86; so that either a heat slots H1 which are :longer than the ccrrespond~ ing or cooling liquid may be circulated through ing upper slots I §32. theYwalled-in space surrounding the interior of In the operation of. the..` spring-controlled the container. The inner bottom wall ldd is truste-conical îrollers-a firm pressure of veach shown relatively thin, this being desirable to cause roller against the side. wall of the container is a more rapid bottom heating or cooling, as the maintained'at' all times in both embodiments of case »may be, ofthe contents of the container. the invention and-«in the'embodiment thereof A thermometer 88 is shown positioned to indicate wherein the heating arcuate. springs 9S and 529 externally of the container the temperature o are‘used; an additional range oi’A yieldability is the liquid within its double wall. - l 40 afforded because. when a large lump is encoun Describing now the modified means shown in Figs. 6 to 9 for mounting the frusto-conical mem bers i6 and controlling their action, the shaft i3 tered by one of the rollers, not only the arm of the arcuate‘hspring> at that side of the container is deiiecte'd,V but kalso the opposite arm of 'such has ñxed to it an upper cross-bar 9i? and a lower spring yields,l thereby .increasing the range` of cross-bar 9i, corresponding, respectively to the 45 yieldability. cross-bars I4 and l5 already described. The mid. Inbothlembc-d'inentsof the invention, cen’ length portion of the cross-bar 9@ consists of a trifugalffórceaidsl inëthe spring means urging block t2 with a vertical bore to fit around the shaft’ |3ï ‘to which said block is secured by'a pinv the rollers-.toward the side wall of the container. The large upper portions of the frusto~conical 93.V From each end of this block projects a pair 50'. rollers are best' adapted to crush the soft. pastv of horizontal arms 915, the arms of each pair being ' masses orlurnpswhich the stirring means tends. parallel and horizontally spaced apart, as shown, to moveetoward thetop >or“ the container, while to have slidably Íitted between them the bearing ' the Smaller, moreconcentrated masses will tend blocks 69. The upper cross-bar âiirhas flanges to sink and be acted upon by the smaller end por~ BSÍ toy support' the upper bearing blocks, and the 55 tions*V of the rollers, which are better adapted to lower cross-bar 9i has iianges 9H to support the act upon-'l-them.y In the modification therollers lower bearing-blocks. ' ' The principal difference between >the modifica tion and thev structure iirst described resides inv the-provision of additional springs QS and 9B, 60 floatably mounted, to regulate the action of the frusto-conical members iSd. Describing next the upper‘spring 98 and- parts cooperating with it, said spring consists of an arcuate horizontal strip of resilient metal each limb of which is length ened by'havingriveted to it an arm Iûll which terminates in a short upwardly directed finger lill', opposed slots lë2 :being formed through the Iâztareshowny having their curved faces unn grooved,`the use of the grooved type yof roller- being considered .opti-chal. Itshouldrbe understoodfthat thev present closure'fisfor the purpose ofßillustration only that this invention includes all vmodifications equivalents which wall within the scope of subject. matter claimed. What is. claimed ~ is: dis and and the ~ ' 1.”.Inf-almachine` of the‘läind described, a con tainer having aniupstanding side wall with a cylindrical inner surface,V a driving shaft mount inner portions of the aforesaid paired arms 813, n ed axially withinv said container, roller mounting said arms §90 being ñtted within these slots for 70 means comprising bearing blocks mounted in lateral’shifting. In assembling this part of the guide 'slots ñxed to said shaft,> spirally grooved, structure the arms iûû are put into place as frusto-conical rollers having their larger ends shownïwith their ñngers mi directed upwardly directed upwardly and provided with trunnions and .then‘the straight end portions of said arms projecting from `their upper and'lo'wer -ends aref'bolted,oriotherwise secured to the endfpor ' mountedin saidcbearíng blocks Ain an opposed' 2,413,793 7 8 relation to each other and maintaining the outer ed axially within said container, a cross-arm fixed to said shaft, said cross-arm having a longitudi nal guide portion at each side of its midlength, a bearing block in each of said guide portions,l surfaces of said frusto-conical rollers in a crush ing and grinding relation to said wall, springs carried by said mounting means in said guide slots and urging the trunnions of said rollers to. ward a contacting relation to said wall, and Y. crushing means in a cooperative relation to each means to slidably support said bearing blocks and tainer wall, roller mounting means carried by said shaft comprising a horizontally extending cross the rollers carried thereby in said guide slots, said means comprising flanges projecting inwardly into said guide slots along each side thereof. of said bearing blocks and to the aforesaid con arm having at its midlength portion fixed to said shaft, a pair of upstanding crushing rollers one 2. The subject matter of claim 1, and a bowed of which is located at one end of said cross-arm spring having its free end portions horizontally extending through cut-away portions in said and the other at the opposite end thereof, both of said rollers being in a cooperative crushing relation to the side wall of said container, said roller mounting means at each side of said shaft and being longitudinally shiftable therein against 15 rollers each having a trunnion which is opera tively connected with the adjacent end portion the inner ends of the springs occupying said guide of said cross-arm and is movable radially in re slots. lation to the aforesaid shaft, and a floating spring 3. In a machine of the kind described, a con carried by said cross-arm, one end portion of said tainer having an upstanding side Iwall with a cylindrical inner surface, a driving shaft mount 20 spring being operatively connected with the trun nion of one of said rollers and the other end por~ ed axially within Isaid container, two vertically tion of said spring being operatively connected spaced apart cross-arms ñxed to said shaft, said with the trunnion of the other of said rollers, cross-arms having longitudinally extending whereby, when a radially inward movement of guides in their end portions, bearing blocks in either of said trunnions takes place independ said guides, rollers mounted within said container ‘ ently of the other both the arms of said floating in a grinding relation to said side wall, said rollers spring are deformed to compensate therefor. having trunnions operatively connected to said 8. In a machine of the kind described, a con bearing blocks, and bowed springs having end tainer having an upstanding side Wall with a portions carried by said cross-arms at opposite - cylindrical inner surface, an upstanding driving sides of said shaft and positioned so to act upon shaft located centrally of said container, a cross said bearing blocks to urge said rollers toward arrn ñxed to said shaft, said cross-arm having a said wall. longitudinal guide portion at each side of its mid 4. In a machine of the kind described, a con length, a bearing block in each of said guide por tainer having an upstanding side wall with a tions, crushing means in a cooperative relation cylindrical inner surface, a driving shaft mount to each of said bearing'biocks and to the afore ed axially within said container, a cross-arm fixed said ccntainer wall, resilient means carried by to said shaft, said cross-arm having a longitudi~ said cross-arm and tending to move said bearing nal guide portion at each side of its midlength, blocks outwardly from said shaft, Isaid resilient a, bearing block in each of said guide portions, crushing means in a cooperative relation to each 40 means comprising a bowed spring having end por tions attached to said cross-arm at opposite sides of said bearing blocks and to the aforesaid con of said shaft, said end portions of said spring tainer wall, and resilient means carried by said being operatively connected to ‘said bearing cross-arm and tending to move said bearing blocks, a scraper fixed to said shaft and posi blocks outwardly from said shaft, said resilient tioned to scrape the bottom of the container when means comprising a bowed spring having end he shaft rotates, and a paddle fixed to said shaft portions attached to said cross-arm at opposite and extending radially therefrom in the lower sides of said shaft, said end portions of said spring portion of said container at a higher level than being operatively connected to said bearing blocks. - 5. The subject matter of claim 4, and a spiral I compression spring positioned to convey pres sure from each end portion of said bowed spring to the bearing block with which is cooperates. 6. In a machine of the kind described, a con tainer having an upstanding side wall with a ; said scraper, said paddle being superjacent to _said scraper and so inclined as to produce an upward current of the part of the contents of the container upon which it acts. 9. In a machine of the kind described, a con tainer >having an upstanding side wall with a cylindrical surface, a driving shaft mounted axi ally within said container, upper and lower par cylindrical inner surface, a driving shaft mount allel cross-arms fixed to said shaft, a roller car ed axially within said container, a cross-arm ñxed ried by and bridging the distance between said to said shaft, said cross-arm having a longitudi cross-arms at each side of said shaft, said rollers nal guide portion at each side of its midlength, a bearing block in each of said guide portions, 60 being in a crushing or grinding relation to said wall, a scraper having an upwardly and down crushing means in a cooperative relation to each wardly extending scraping portion in engagement of said bearing blocks and to the aforesaid con with said wall, means whereby said scraper is tainer wall, an arcuate spring structure, said maintained in a fixed relation to said shaft to cross-arm having cut-away portions at each side of said shaft and an end portion of said spring 65 gyrate therearound along with said' rollers, and resilient means carried by said cross-arms and structure extending horizontally through each of tending to move said rollers outwardly from said said cut-away portions and being therein shift able longitudinally of said cross-arm, and a spiral shaft, said resilient means comprising a bowed compression spring bridging the space between spring having end portions attached to each said each of said bearing blocks and the end portion 70 cross-arm at opposite sides of said shaft, said end portions of said springs being operatively oon of the aforesaid arcuate spring structure at that side of the aforesaid shaft. A nected to the ends of said rollers. 7. In a machine of the kind described, a. con l0. In a' machine of the kind described, a con tainer having an upstanding side wall with a tainer having an upstanding side wallV with a cylindrical inner surface, a driving shaftmount cylindrical inner surface, a driving shaft mount 2,413,793 10 ed axially within said container, upper and lower parallel cross-arms fixed to said shaft, said cross arms having a longitudinal guide-portion at each side of their midlength, a bearing block slidably mounted in each of said guide portions, frusto conical rollers having their larger ends directed upwardly and provided with axially alined trun operates, and means to slidably support said bearing blocks and in turn the rollers carried thereby in said guide portions, said means com prising flanges projecting inwardly into said guide portions along each side thereof. nions projecting from their upper and lower ends 13. In a machine of the kind described, a con tainer having an upstanding side Wall with a cylindrical inner surface, a driving shaft mount journalled in said bearing blocks, said rollers ed axially within said container, upper and lower bridging the distance between said cross-arms at 10 parallel cross-arms fixed to said shaft, said cross arms having a longitudinal guide-portion at each each side of said shaft, the faces of said rollers being in a crushing or grinding contact with said side of their midlength, a. bearing block slidably mounted in each of said guide portions, frusto wall, resilient means carried by said cross-arms tending to move said bearing blocks outwardly conical rollers having their larger ends directed from said shaft, and means to slidably support 15 upwardly and provided with axially alined trun nions projecting from their upper and lower ends said bearing blocks and in turn the rollers car ried thereby in. said guide portions, said means journalled in said bearing blocks, said rollers comprising flanges projecting inwardly into said bridging the distance between said cross-arms at guide portions along each side thereof, a dome each side of said shaft, the faces of said rollers shaped cover for said container, and a scraper 20 being in a crushing or grinding Contact with said having a scraping edge contoured to conform to wall, resilient means carried by said cross-arms and tending to move said bearing blocks out the curvature of the underside of the cover car ried by said upper cross-arm. . ~ wardly from said shaft, said resilient means com~ prising a bowed spring having end portions at 11. >In a machine of the kind described, a con tainer having an upstanding side wall with a 25 tached to said cross-arms at opposite sides of said ' shaft, said end portions of said spring being op~ cylindrical inner surface, a driving shaft mount eratively connected to said bearing blocks, and ed axially within said container, upper and lower means to slidably support said bearing blocks and parallel cross-arms fixed to said shaft, said cross arms having a longitudinal guide-portion at each in turn the rollers carried thereby in said guide side of their midlength, a bearing block slidably 30 portions, said means comprising flanges project ing inwardly into said guide portions along each mounted in `each of said guide portions, frusto conical rollers having their larger ends directed side thereof. upwardly and provided with axially alined trun 14. ‘In a machine of the kind described, a con tainer having an upstanding side wall with a nions projecting from their upper and lower ends journalled in said bearing blocks, said rollers 35 cylindrical inner surface, a driving shaft mount ed axially within said container, a cross-arm fixed bridging the distance between said cross-arms at to said shaft, said cross-arm having a longitudi each side of said shaft, the faces of said rollers nal guide portion at each side of its midlength, being in a, crushing or grinding contact with said a bearing block in each of said guide portions, wall, resilient means carried by said cross-arms and tending to move said bearing blocks out 40 crushing means in a cooperative relation to each of said bearing blocks and to the aforesaid con wardly from said shaft, said frusto-conically tainer wall, and an arcuate spring structure, said shaped rollers having their frusto-conical faces cross-arm having a cut-away portion at each spirally grooved, and means to slidably support side of said shaft and an end portion of said said bearing blocks and in turn the rollers car spring structure extending horizontally through ried thereby in said guide portions, said means comprising flanges projecting inwardly into said each of said cut-away portions and being therein guide portions along each side thereof. shiftable longitudinally of said cross-arm to move side of their midlength, a bearing block slidably mounted in each of said guide portions, frusto conical rollers having their larger ends directed having longitudinal guide portions at each side of their midlength, bearing blocks slidably mount ed in each of said guide portions, crushing means in a cooperative relation to each of said bearing said bearing blocks outwardly. 12. In a machine of the kind described, a con 15. In a machine of the kind described, a con tainer having an upstanding side wall with a cylindrical inner surface, a driving shaft mount 50 tainer having an upstanding side wall with a cylindrical inner surface, a driving shaft mount ed axially within said container, upper and lower ed axially within said container, upper and lower parallel cross-arms fixed to said shaft, said cross cross-arms ñXed to said shaft, said cross-arms arms having a longitudinal guide-portion at each upwardly and provided with axially alined trun nions projecting from their upper and lower ends blocks and to the aforesaid container wall, and Y journalled in said bearing blocks, said rollers bridging the distance between said cross-arms at an upper and lower arcuate spring structure, said upper and lower cross-arms having cut-away portions at each side of said shaft and an end portion of each of said upper and lower spring each side of said shaft, the faces of said rollers being in a crushing or grinding contact with said wall, resilient means carried by said cross-arms structures extending horizontally through each of said cut-away portions and being therein shift and tending to move said bearing blocks out wardly from said shaft, said resilient means com 65 able longitudinally of said cross-arms to move said bearing blocks outwardly. prising a bowed spring having end portions at 16. The subject matter of claim 15 and, a spiral tached to said cross-arms at opposite sides of compression spring bridging the space between said shaft, said end portions of said spring being each of said bearing blocks and the end portions operatively connected to said bearing blocks, a spiral compression spring positioned to convey 70 of the aforesaid arcuate spring structures at that side of the aforesaid shaft. pressure from each end portion of said bowed spring to said bearing blocks with which it co RENWICK J. SHARP.