US1921697A - Abrasive feeding mechanism for stone cutting machines - Google Patents

Description

Allg. 8, 1933. 1 M Hl @WENS Er AL ABRASIVE FEEDING MECHANISM FOR STONE CUTTING MACHINES g" f@ Caf/Mag@ Aug. 8, 1933,. M. H. OWENS Er AL 1,921,697

ABRASIVE FEEDING MECHNISM FOR STONE CUTTING MACHINES y Filed Nov. 27, 1931 sheets-sheet 2 Qwuemtoc Aug. 8, 1933. M, H OWENS ET AL 1,921,697

ABRASIVE FEEDING MECHANISM FOR STONE CUTTING MACHINES Filed Nov. 27, 1951 6 Sheets-Sheet 3 gnue'ntoz llg- 8, 1933- M. H. owENs n AL 1,921,697

ABRASIVE FEEDING MECHANISM' FOR' STONE CUTTING MACHINES Filed Nov. 27, 1931 6 Sheets-Sheet 4 tica/nui Aug. 8, 1933. M. H. OWENS Er AL 1,921,697

ABRASIVE FEEDING MECHANISM FOR STONE CUTTING MACHINES Filed NOV. 27, 1951 6 Sheets-Sheet 5 M45/J A/ @wf/v6 A/a 576/6 l a@ @M Aug 8, 1933- M. H. owENs Er AL 1,921,697

ABRASIVE FEEDING MECHANISM FOlr STONE CUTTING MACHINES Filed Nov. 27, 1931 6 Sheets-Sheet 6 gmc/Moc Patented AugieS', 1933 Y .il i} I.

f UNITED STATES PATENT- ,Omc

1,921,697 ABRAsIvE FEEDINGV rnicmuvsivr` FOR STONEC U'FrINdMACHINES` MackiH. Owens, lLakewood@and Earl A." Burr,

Shaker Heights, Ohio; assignors to the Cleveland Quarries Company, Cleveland, Ohio, a A Corporation of Ohio Application `November 27', `1931 Y K Y Serial N0.- 577,502

1s clams.- (c1. 12s-12) f This invention 4relates broadly to stone `sawv,F.ig..9 is an enlarged fragmentary view of partA ing or cutting machines and `more particularly `of anabrasive material distributing unit. to abrasive feeding mechanism for' vsuch ma- Referring first to the general assembly shown chines. in Figs. 1 and.2 of Vthe drawings, the sawing"V v 5 The. primary object of the invention lis to apparatus iS helellllstated mre O rless dia-60 lgenerally improve and render more efficient abglammatically, ii? beingunderstood that the imv rasive feeders1 for stone saws or cutters, parti- YDIOVB...flling vIlillfiIliSIIl maybe `used With v cularly those ofthe gang type.r With this object 'any Suitable type of machine. The frameofthe in view, Vmeans of a particularly advantageous SaWing'machine includes upright ybearljlS 01 C014 `4 character are providedfor efficiently distributvumn's 5` which aresupported on a base '6` and 65 ing the abrasive material fed to the entire gang connected by cross vbeams`'1r,8,f 9 and 1 0. Pivotof saws Vand for selectively augmenting the allysuspended from the'uprights bymeans of quantity thereof fed to each saw, or kerf formed 'bearing brackets `A11, r'shafts `12,` arms 13 and by the'saw to thereby, `among Vother advantages, bar^14 'are a plurality 01' gang OfSaWS Q1' 611i?-k f insure `efficient work of theY saws and prevent ters l5, vwhich are shown partially through a 70.

retardation of theentire group orfgang of saws Astone S, the latterbeihg carried byev truckfT by one or more lagging saws. The driving mechadapted to `travel on rails R. The arms 13 are anism for the feed devices is constructed' with' shown as vbeing-11einforced-bybraces 13a`xe`d a View toward facilitating adjustment and acto theshaft' 1l2 The, saw-supporting membersY curate control of the feed, and means are projust specifiedconstitute a carriage for the saws 7:5

45 elevation of the mechanism shown in Fig. 3; ing knowledge ofthe-art,

vided for determining at a glance whether or 15, WhiCli iS 'adapted 150D@` Oscillatd byfa'iy not the feeding mechanism is functioning with vSuitable .maI.1S,x thal7 here ShOWIl being n'll'ghe respect to'eachrespective saw.A .Y ffOrm ,O fa Crank ldmounte'd' on va vdrive shaft The means for conducting-the arasivema- AiLthe latterbeing 'Supported by bearinsrd-Y terial to the saws or cutters are adjustable to Alslsl- Tlleflllk 16 COIlIleClled 6 0" the 80. accommodate different heights of stone amil Saws lby meanso'f @Pitman 191arid`cr0ss Shaft widths orcuts, and nhestructurelof the'feedig 20l WhiCh'iS Connectedytq, the ernisofy the saws. `mechanism is relatively simple in construction The "0T2-nk 15 .may .be driven from any Sullafble and isendowed Ywith features which render ,it S-OUTCC'O Power not'ShQV/n l v i superior in efficiency over machines of this class AS the SaWS 15 ref oscluapef 111 @Ontal With 85 -as'heretoforedevised l .,th? 'Stone they* are mtermlttntly loweredor The foregoing and other featuresnof novelty progressedasihey'performnl?? @zitting run'v and advantage in construction of the improved. non the means here shownbemg m .ther ,form feeding mechanism Wm become apparent invew Vof `vertical -threaded shafts 21 which are Jourof the following descriptiontaken in conjunction with the drawings, wherein- "f 5the bearings 11 for `the saw beingk threaded on Fig. 1 is a view insideveievauon of a jgang .said Shaft 21," .At'ther upperlends these. shafts are provlded wlth sprockets andsprocket chains saw Vor cutter and co-operatlng feeding mechal v .y l Y Y f 23 and 23a and driven in synchronlsm by means nlsm luutramye o? thefeatures.' of the Inl/elmo@ of `.bevel fgears 24k and 25 and 24a and 25a, pul- 95 1' Fig. 2 is a View 1n end elevat1on, 1ys.2 6 nd 26-a md .d belt 27 Whh may ex- Flg' 3 1s a p an Vlew of h? feedmg mechamsmf. tendto any suitable ratchet mechanism and be and. 'driven'in synchronsm withthe main driveof Flg. 4 1s an enlarged view 1n section and end the maehme as Wmibe understood by thesehew Flgf 5 1S an enlarged fragmentary dem VleW During the oscillation of the saws intcontact 1n plan of parts 0f thendrlvemehamsm and wimthe'stone sithey aresupplied with cutting `control therefor; and' l abrasive, generally in vthel vform of a mixture'of Fig- 6 1S a vleW taken on the line 6-6 of Fig. 5; steel grit, Sand, water and/or other abrasives.

` Fig. 7 iS fragmentary ViW inV IOI'IG leva- The 'means for "supplying thisabrasive material 105 4 55 cators, and

ltion ofv a vnumber of conductor boxes in d i'sembody the principal features of the presentinf sembled condition; j vention and will now be described.`

Fig. 8 to`8e, inclusive, are detail views in sec- Supported on the Ycross shafts V8 vare hopper's tional elevation of various forms of feed indi 28 and 29, the hopper 28` kbeingthernain feed f r hopper, while the hoppers 29- constitute auxil-llO `naled in bearings 22 supported by the uprights 90 Avat ravity into conductor pipes or tubes 33. Apermit adjusta'bility of these conductor pipes in iary feed hoppers. These: hoppers are provided with bottom walls Which form receptacles 28a. and 29a for the material passing by gravity from Vthe lbottom outlets of said hoppers; The hoppers are supplied with suitableabrasive material,

such as chilled shot and/or sand or the like. Extending adjacent the outlet of the main feed hopper 28 and journaled at opposite ends in bearings 30a supported on a suitable frame structure is a shaft 38,' and on this shafta plurality of impeller or feed Wheels 31 are secured,

each of which. is formed with a series of `feed` ing teeth or buckets 31a,V note Fig. 4. TheseL feed Wheels pick upthe material passing from the hopper 28 into the bottom receptacle 28a Yand deliver a suitable quantity thereof to conductork boxes 32, there preferably '.beingone of these boxes for each saw, or kerf formed by the saw. Due to the toothtype of feed,1 the rnate-r rial is delivered in an even manner. From the conductor boxes the abrasive material fallsjby To accordance with the spacing of, the saw kerfs they areoprovided with flexible or universay joint iconnections 34, thus permitting said pipes to be vkturnedto various positions with respect tothe stone, note particularly Figs. 2 and 4, and to I permit adjustability 'as to height, said tubes are such as the set rscrcvvsfib.

telescoped, as'atffia, Vand provided with means for l, maintaininggthe proper adjusted position A feature of the present invention resides in I jan auxiliary abrasive' material supply feed in conjunctonjwithgthe main'feedr hopper 28. This auxiliary feed consists of a plurality of the hoppersi 2,9, above specified, which have extending vtherethrough a vshaft 35, the latter being jourjnaled at oppositeY extremities inv bearings 36. Therho'ppers 29 are adjustable longitudinally of lthe shaftr35, and mounted Von said'shaft and ,adapted to rotate in the receptacle 29a. of. each hopper'. are4 feeding Wheelsh37., l(provided with The hoppers 29 are ladjustably ,adapted to clamp against one of the channels 38. It Will be seen that by loosening the screw 40, any on'ev of the desiredv hoppers 29 together fvvyith its feed Wheel 37 may be adjusted along theroW of conductor boxes 32'to augment the supply of abrasivematerial fed to said boxes. Each vconductorbox is provided with a cover 42 ',vvhicl is lpivoted at the'apex of said box and d ,may be thrown to either side 'of the latter as de-y sired. "In the position shown in Fig. 4, the cover is'ninva substantially vertical position and 'pere mits'feed of abrasive from both main and aux- L,iliary hoppers at the same time.'` When slid intoflosed position on either. side ofthe con- .,ductor it prevents abrasive from feeding on the closed side.

remain closed.

Thus both sides may remain open orleither side may be open and the'opposite side he conductor box assembly is supported on .al cross j. bracket 43, in'turn supported. on `the '.,structural members 8. These boxes are shown in enlarged detail in Fig 7. The boxes-on each end Vof the row are formed with lugs 44 while the inl `Awithout affecting the part of shaft 'T35 extending will be noted in Fig. 3.

,shown.,Y Extending vertically With-respect to termediater boxes are formed with complimentary segmental flugs 45. vThe boxes are bolted directly tojan angle bracket 46, see. Fig. 4, byl means of bolts 47. lIn assembling, the intermea diate boxes are positioned side by 'side and then 80 clamped together and secured to the bracket 46 by bolts and clamp Washers, or the like,while the end boxes are secured against displacement by being bolted to the angle bracket 46. This construction facilitates casting and assemblage ofthe boxes andensures retention in an assembledV position With a minimum number of parts.

The means for driving the feedrvvheels 31 and 37, `is particulariy constructed with a view to- VWords permitting anaccurate predetermined feed atv all times. Both sets of feed Wheels are driven and controlled in substantially the same manner as rparticularly shown in Figs 3, 5 .and 6. The shaft 36 in the main feed hopper 28 isV provided at one end with a lgear 48 adapted to be driven from a gear 49 secured on a shaft 50 journaledrin bearings l'xed to a cross support 52. The outer end of the shaft 59vhas` securedl thereon a friction disc member 53, 'note par-"10 ticularlyV Fig. 5, and the shaft 56a for the auxiliary feed has secured thereon a friction Vdisc member 53a. The drive is applied tothese friction membersby means of across shaft f54'vvhichA is journaled in bearings 55uand has mounted.105

thereon, in` splined slidingV engagement therewith, friction members 56 andA 56a`ada'ptedto contact with the discs 53 and, 53mand rotate the latter. To enable the speed to be readilyl varied, the `friction members 56 areA shiftagble'l-10 longitudinally on the ishaftr54, each member being provided With a grooved collar 57 in which a clutch forkl58 engages, the clutchforl; being secured to a rack 59 slidably mounted. in la guide bracket 60,'Which maybe carried byanyd'15 convenient stationary SlllDIlorting'V member. The shafts 5i) and 50a, together with the *discs* 53 rvand 53a thereon arefderpressible longitudinally,

each shaft being provided vvithl a spring 61, bearing collar 62 and adjusting and supporting co1- lar 63. rIhe shaft is preferably providedwith agear Whichengages a long'faced gear--on the end of shaft a to permit this depressing action through the hoppers 29. The rack59 `is provided With ya cam projection y65, `adapted to contact with a cam member rcryoke (i6-Which is formed With-a boss or pin 66a extendingv into the shaft 50.?

The foregoingspeed varying assembly is duplicated for both the main and auxiliary Vfeeds,as

`above specified,` so that the detailed showing in Figs. 5 and 6 is illustrative of both devicesas Each drive is separatelyIk controlled.' The`shaftf54 has securedvon theend thereof a bevelgear 67 adopted to mesh with a gear secured on ashaft 68 which has secured thereona drive-pulley provided with a ,belt 70 kextending to a suitable source of powerfnotl the maehinervare shafts '7l and 71a, noteparticularly Fig. l, which are provided ontheir f upper ends with pinions 7,2 adapted toengage 'the racks'59, the lower ends of said shafts 71 andA 71a145 being provided with indicating `segments 73, which are calibrated as clearly shown in'lig. 5. Handles '74 and 74a are secured on the lower end ofthe shafts 7l and 71a. By turning these handles vin the proper direction, the racks 59,15@

are caused to move by engagement with the pinions 72 and move the friction `drivemembers 56'and'56a` oraway from the centers :of the-Y Afriction discs `53` and 53a, the speed being inp-y creased vor decreased accordingly as the friction wheels 56 and 56a are movedaway from or to-` Al65 engages with the yoke 66 and yd`epressesi -the friction disc A53 or 53a. out'of contact with the friction wheels 56and 56a, depending, lof course,

'Y on which control `lever is being operated.v w f 1 vso evenly over the sides'thereof as it flows toward As `the material passes from the 'conductor tubes 33 it dropsV by gravityfintoaplurality of trough shaped funnels 75, which are provided Ths material augments vthe supply of mixed sand, shot and water distributed from reservoirs 76, which are supported at intermediate points I with respect to the saws and at a suitable distance above the latter. Each reservoir is provided with a plurality of openings, preferably 3 in number as indicated at 77 and 77a (Fig. 2), and the openings 77 being formed at an inter- Aings 77a are formed at opposite ends thereof.

or sprinkler generally indicated at 78l and` particularlyshown in top plan in Fig. 9. The baiiler 78 as shown is a roof-like structure which 'may be made of boards, sheet metal or the like,` and vgradually slopes from the center of themachine toward each side thereof. Spaced .adjustable baffles 'or guides 78a are pivotally mounted on top of the main baille -or` sprinkler 78 by -means of Vpins 79, soythat they may be adjusted'to varying angular positions as shown' in dotted lines on f certain distance apart andithen gradually close Vuntil they meet at the outer end of themain baiileA or sprinkler. Thus as the fluid-like `mass falls on the main `baille 78, it is spread andfalls the outer ends of the sprinklen'the last set of guides 78a stopping the outward flow of the flnalremainingA material and directing it" over the sides ofthe said sprinkler, or main baille 78. As the material falls fromsides of the bafes 78, it strikes auxiliary distributing baffles 80 which are also adjustabln-.`

adjustment, these auxiliary baffles 80 `are pivote` To provide for this ally mounted or hinged as at 81 and engaged .at

their outer'edge byracks 82 carried by a VVcrossVv head 83. These auxiliary distributing bailes 80,

as shown, Vare in the form of a `plurality `of spaced cleats, the material falling onto the cleats Vand passing through the spaces therebetween;

By adjusting the incline of these auxiliary rclis- `txibutors 80, a very efficient distribution of the material may be obtained. I Y

Means are provided for indicating at a glance whether or not a proper supply of abrasive ma- `Y terial is passing through each conductor pipe 33, this means being shown in various forms `in Figs. 8 to 8e, inclusive.` Referring' firsti'to Fig.

i vided with blades of the shape showny'orV said blades may be given any desiredgshape. `As the material falls'through the 4conductor pipes it pipe; openings, it falls onto a main-distributing baffle from the hopper 29.

strikes theblades of theindicatorl wheel` 84 andA revolves the latter. A'meter may -be afiixed 'on speed of revolution of the wheel.

sists of a pivoted member 87 having anindi-v` Y eating `disc 88 on therone`` end thereof adapted to restagainst the L housing in its extreme lowered position. Whenr the sand `falling throughthe conductor pipe 33 strikes the member 88 it raises and lowers the disc88 in accordance with the quantity of sand falling-therethrough., The indicator is mountedfon a `shaft l l 4or pin 86 as in the Vforms shown in Figs. S8 for each kerf formed by the respective4 saws.

`In this instance the device is in the form of 'a fiat plate or disc 89 which lis pivoted or hinged-V ly mounted'on a pin 86a secured to the lower f' 'end of fthe pipe'33. The Weightofl the disc-.89

is such' as to normally maintainV it? in an inclined position over the pipe 33. .The material falling through the pipe 33 strikes the Vface of the `disc 89 andoscillates the latter'accordingv to the quantity of material ,falling through-said In Fig. 8e the conductor vpipe is cut away at its lower end as shownto give aivisual indication of the flow of material.

Fromthe foregoing the operation of the mech- 1 anism will'be readily understood."` Briefly summarizeivthe` stones S are loaded' onto trucks T andmoved up'intov cutting positiongwithrespect to the gang saws '15. Thelattergaretlfien oscillated .and intermittently lloweredby the hrio teris supplied tothe saws.

The'supply of mixed abrasive material and, Water is carried aroundin acontinuous cycle Aand is continually beingreplenishedwith dry material from the hopper 28 and, Vwhen required,

Below "the machine is a sump 90Y and conduit 90a, the latter'leading into a well `91 provided. with an overfiow conduit 92A -for carrying off powdered stone floating on the Water. A supplyl pipe 92l and ahopperf94 'are' provided for 4addingwater andsand When'required A pump 95` forces the material back up to"thereservoir'76 through a pipe oriconduit 96.

TheV abrasive material an'd 'water/from .the c reservoirs '76.V falls onto Aand Ithrough thel dis-v tributing apparatus` heretofore describedandA then onto the stone arid into the kerfs formed` 'by the saws, while Vthe dry freshreplenishing supply of chilled shot, sand or` like material `is taken from the hopper 28 bythe feed'wheels `s31`. and falls int'oqthe c onduct'or'boxes 32 Vand passes down through the tubes 33 intotheguide .funnels 75.V Shouldany particular sawor saws require additional abrasive vrnaterial, it is lonly necessary to adjust the auxiliary hoppers 29 Yto the desiredl point with respect to the proper c onductor box or boxes andv throw-the control han# l dle 74ato running position, the quantity being easily controlled by` adjustingthe speed/of the Wheels 37. lThus, any vsaw orsaws which may be laggingdueto insufficient abrasive material canbebrougntup tothe desired cutting'sspeed.

The main feed from the hopper 28may'be.

readily adjusted by turning the handle 74Jand varying the speed of the friction disc 53. vDue tothe relatively large number of teeth 32 on the 'J wheel 31, the supply :of material from the' `main hopper 28 to each`=conductor box r`32; is-substan- ..;tia`l1y.,.constant. and inproportion to theispeed perja support for said auxiliary hopper, and

.Iofthefdrive Any number 'of auxiliary feed assemblies or i hoppers129 may foe provided, and

" `other obvious modioationsadoptedwithin .the

scopef of Y the invention as defined `by the appended claims. Y

. What we .claiml is: f i Y 1.1Mechanismforfeeding abrasive material to stone cutting saws Ycomprising a main feedhopper,'.a` plurality of feed wheels in said. hopper,

, auxiliary feedhoppers -adjustably mounted; with respect to said-.conductor `boxes for selectively augmenting thesupply vof material delivered' thereto.

'3. Abrasive feeding mechanism for stone saws comprising'a hopper, a plurality of impeller Wheels rotatably mountedin saidhopper, in-l dividual conductor boxes for each impeller Wheelp'one'or more auxiliary feed hoppen,I also 'provided with impeller Wheelamounted to cooperate with saidmain hopper,means for driving saidim eller wheels, and means fori-adjusting thedrive of said wheels to vary the quan-V f tity of materialdelivered `from'said hoppers to f said conductor boxes.

4. A mechanism` for feeding abrasive material to stone saws, comprising a main .feed hopper,l a VI'Jluiality Vof.impeller wheels rotatably fmounted'insaid'hopper, one or more auxiliary feed hoppers 'also provided With'impeller wheels .mounted to` co-operate with said main hopper, Ymeans for driving the impellerywheels of both hoppers, and independent means for adjusting the'drive of said Amain and auxiliary wheels.

5..A mechanism for'feeding abrasivemate- `rial to stone saws, comprising a main feed hopyper and one. or moreauxiiiary feed hoppers mounted to co-operate with said main feed hopper, Vimpeller wheels rotatablyv mounted in ysaid-main and'auxiliary hoppers, independently operating coacting friction members for driv ing the impeller wheels in said main and aux per having a plurality of Vabrasive outlets, anr

auxiliary hopper adjustably mounted for. movement longitudinally of said main hopper and adapted to. co-operatewith said main feed `hopperwhereby the supply ofi abrasive material from any one of the main feed hopper outlets may bev augmented, conductor boxes arranged Vto receive the material from said hoppers, and

conductor tubesv connected to said conductorboxes, vsaid conductor Vtubes being provided `with .flexible connections to permit adjustment thereof. Y

7; In la stone cutting machine, mechanism for feeding fabrasive material, comprising a main feed hopper, means for discharging abrasl sive fromY said main -feed hopper to a plurality of points of application,V 1an auxiliary -feedfhoppermounted to yco-operatewith-said main hopmeans for adjustably ysecuring said vauxiliary hopper to, said support wherebyl said auxiliary.

hopper may be lselectively positioned toincrease the quantityof abrasive fedto anyone of said points of application.

8. In a stone cutting machine, va main f id hopper provided with a bottom Wall formingalr.

receptacle for abrasive material, one or more j auxiliary feedhoppersalso provided with bottom Walls forming a receptacle fork abrasivefmaterial and adjustably Vmounted with respect to; said main hopper, individual conductor boxes adapted to receive the material from saidlreceptacles,`

a plurality of -toothed wheels for delivering thev material from said receptacles to said .conductor boxesV and'means for independently confeeding abrasive material. to a plurality-of saws,

. comprising, amain feed hopper for abrasive Inaterial, a plurality of main feed wheels adapted to discharge abrasive material from said lmainr `feed hopper, a plurality of conductor .boxes adapted toreceive material discharged from` said main hopper by said main Yfeed wheelsfaniauxiliary feed hopper y adjustably Ysupported Vwith los respect `to'said mainhopper, an auxiliary feed i wheel kin said auxiliaryhopper,l said auxiliary hopper Vand feed wheel being adapted to be se-` vlectively positionedto discharge` abrasive mate rial into any one of said conductor boxes.'

l0. Inapparatus of the class described, aplurality of stone saws, conductor tubes adaptedV to deliver abrasive material toY said stone saws, conductor boxes `disposed at the inlet ends'of said conductor tubes` and means fork delivering abrasive material tosaidrconduc'tor boxes including a-v main feed hoppena shaft extending longitudinallyof said hopper, a plurality of feed wheels-mounted on. said shaftV and adapted to dischargey abrasive material fromsaid hopperl 'intosaid conductor boxes and an auxiliary hopper and feed Wheel adjustably mounted with respect to--said conductorboxes whereby rthe supplyof abrasive delivered to anyofj saidv conductorboxes by the mainlfeed wheel may be augmented by-abrasive material feedvv from the auxiliary hopper bythe auxiliary feed Wheel.V

11.. In apparatus/of ithe Yclass describedaplurality-of abrasive material conductors disposed transversely-across and-above the `work bed 'of a stone saw, means forY supplying abrasive 4material to said conductors comprising a main Yfeed qhopper, a plurality ofmain feed .wheels radapted `to deliver `abrasive maerial from said "fmain' vhopper to said conductors, and an auxiliary feed hopperand feed wheel mounted for 'movement :relative to saidconductors whereby. said auxiliary rhopper and feed` Wheel'may be positioned to supply abrasive materialfto any one of said conductors. Y

- 12. Invapparatus of the class described, a plurality Aof abrasive material conductors disposed transversely across and above' the work bed of a stone saw, meansfor supplying abrasive material to said conductorscomprifsing a main feed hopper, av plurality of main feed Wheels adapted per and feed Wheel may be positioned to supply abrasive material to any one of said con--` ductors, means for driving said feed wheels and independently adjustable means for varying the speed of rotation of said main feed wheels and said auxiliary feed wheel.

13. In a stone cutting machine having a plurality of cutting saws, mechanism for feeding abrasive material to said saws, including abrasive material distributing means adapted to feed `substantially equal amounts of abrasive material vided with a plurality of independent feeding.

devices for distributing substantially equal quantities of abrasive material to each of said blades,`

and an auxiliary feed hopper adjustably supported whereby it may be selectively moved into position to augment the supply of abrasive feed to any one of said blades.

15. In a stone cutting machine, a gang saw` Ais having a plurality `of blades, means'for impart y ing sawing movement to` said gang saw, and,` f

means for feeding abrasive to saidblades, said 1 feeding means including a main feed hopper prov` vided with a plurality of independent feeding devices for distributing substantially equal quand-Hr i tities of abrasive material to each of said blades; y an auxiliary feed .hopper adjustably supported whereby it may b e selectively moved into position to augment the supply of abrasive feed to f any one of said blades, and means for independfed from said main and -auxiliary hopp'ers..

ently controlling the rate at which abrasive is 16. In a stone cutting machinehaving a lplu`- rality ofl cutting saws, mechanism for feeding abrasive material to said sawsincluding abrasive material Ydistributing means adapted to feed substantially equal amounts of abrasive `ma-v terial to each of saidcutting saws, auxiliary ,A vabrasive material feeding means adapted to be selectively positioned kto augment the supply of abrasive material to one'of said cutting saws,

and means for independently controlling the rate of feed from said main and auxiliary abrasive feeding means.

" `EARL A. BURR.

MACKl H. OWENS.

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