USRE17102E - wadsworth - Google Patents

Description

Oct. 9, 1928. Re. 17,102

. H. L. WADSWORTH" SAND MIXING APRARATUS I Original Fil ed May 12, B23 5 Sheets-Sheet 1 INVENTOR.

A TTORNEYS a sheets-sheet INVENTOR! A TTORNEYS E r a m M L M a w a H Oct. 9, 1928.

H. L. WADSWORTH SAND MIXING APBARATUS Original Filed May 12, 1923 Oct. 9, 1928. Re. 17,102 Y H. L. wADswoR-m.

SAND MIXING AIIPARATUS ori inai'l-ned May 12, 1925 s Sheets-Sheet 3.

- I INVENTOR.

flow ard L. Mala swarm ATTOM .s

. more keys 18 dinally of the hub by means of a collar 19 Se Reissued Oct. 9, 19 28.

v UNITED STATES HOWARD L. WADSWORTH, E CLEVELAND, OHIO, ASSIGNOR, BY MESNE-ASSIGNMENTS,

a .Re.17,10 2 PATENT, OFFICE.

rom H. CLEMI'NSHAW, or CLEVELAND, orno.

sANn-Mrxnm arrana'rns.

Original No. 1,566,133, dated December 15,1925; Serial No. 638,498, filed May 12, 1923. Application for reisue" filed A r l a 1927.

The present invention, relating, as 'indicated, to sand-mixing apparatus, is more par-- 'ticularly directed to. an improved sand cutting or mixing machine for use in pulverizing, mixing and preparing molded sand in foundries after use. A further object of the invention is the provision of a portable machine of the abovetype which shall be extremely simple in its construction, easy to operate and of light weight. To the accomplishment of the foregoing and related ends,

said invention, then, conslst-s of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawlngs and the following description set forth in detail certain mech-- anism embodying the invention, such disclosed means constituting, however, but one of the various mechanical forms in which the principle of theinvention may be used. In said annexed drawings Fig. 1 is a side elevation ofmy improved machine; Fig. 2 is a planview of the same, Fig. 3 is a central vertical section through the transmission mechanism; Fig. 4'is a section on the line 4-4 in Fig. 8; Fig- 5 is a vertical longitudinal section through the driving means for the cutting cylinder; Fig. 6 is a section on the line 66, Fig.15; and Fig. 7 is a. section on the line 7-7, Fig. 5.

In Fig. lthe machine is shown as consisting of a rectangular frame 1, provided with Themeans for propelling the machine over the ground consist of a motor which is here shown in the form of an electric motor 8 operating a. shaft 9 which enters a transmission case 10 and is there provided with a worm 11 driving a worm gear 12. This worm gear 12 is provided with a broadened hub portion 13 which is mounted within two spaced roller bearings 14 and 14', which are carried in the case 10. Slidably mounted within hub13 of the Worm gear is a sleeve15,which is provided with two'aligned circular openings 16 and 16', and with aligned square openings 17 and 17 MThis sleeve is non-rotatably se cured within the hub 13 by means of one or and may be shifted longituing the drive from one or being Serial No. 181,582 I cured to the sleeve and ashiftin'g yoke operated by means of'a square shaft 21, which i the case 10 extends through an opening in and is there engaged by'means of a handle 22.

Rotatably mounted within the sleeve and in bearings 23 and 23' mounted. in the case are two driving shafts 24-and 24, each of which is provided witha circular portion which is borne in .the circular portion of the sleeve 15 and with squareportions 25 and 25', which are engaged in a driving relation by the squared portion of thesleeve 17, depending upon the position of the sleeve. shaft 24 is connected to a driving gear which consists of a series of pins 27 engaging in an internal gear28 in the wheel'4, while the shaft 24 is removably secured'to a shaft 30 which extends transversely of the machine, and at its end is connected'toa second driving gear 31 which in turn engages an internal gear on the other of the two traction wheels 4 so that simultaneous operation of thesha-fts 24 and 24' causes simultaneous operation and driving of the two traction wheels.

The present transmission affords means of steering the machine by disconnectthe other of the driving shafts 24 and 24', which is effected by movement of the handle 22 to rotate the shaft 21 and in this way shift the collar or sleeve 15 longitudinally of the two shafts 24 and 24 v to disengage the squared portion of the sleeve 15 from one or the other of the squared ends of theshafts 24and 24. lVhen this. is done the shaft whose squared portion is disconnected from the-squared portion of the sleeve is undriven, the sleeve rotating freely on the circular portion of the shaft.

The sand-cutting mechanism of the present machine consists of a sand-cutting cylinder made up of two series of oppositely extending spirals 40 and 40, which are in the form of blades mounted upon rods 42 set in central hollow members 43 and 43. This cutting cylinder is carried in a framework The ends of this square rhaft 46 are formed round and provided with suitable friction The a simple mounted' in suitable' bearings' 53 in a'housing I exact alignment between with a pile o'ffsand.

bearings, upon which the traction wheels 4 are mounted, so thatzthe wheels'turn'freely with respect to. the square shaft, While the square shaft can in turn be oscillated in order cylinderratgdifferent to; position" the, cutting levels, and to lift it in mndoutof. operation The construction of best shown in Fig. 5. The two members 43 aiitl43 are tubes, int-o thea'djacentinner ends of which are integrally secured plugs and 5Q, which 51 .an'di51'.

are provided 'with squared ends These squared ends are non-roslidablysec'ulfed Within a square tatably but 'ge'ar'52, which is rotatably opening in aworm or case 54, which is carriedon a central supporting arm 55" extending forwardly from the square shaftetfi. .Thec'ylinder construction, inv'olvingas it"does theuse ofonly two ordinaryetubes, into which-the square plugs are secured, is simple and-inexpensive, while t-hextwo .tubes'is e'f-- fecte'dby mounting these tubes in removable caps 56 and '56, which are secured against the outer sides of the casing'54,iwhile' between these caps and casing are packing ,glandsl 5,7. The} blades. 40 andAO are secured, as stated, to the ends of rods '42, which are passed through holesbored through the tubes 43,43,

. I means.

"The driving mechanism'ifor the cut'tingcylinder consists of anelectric motor'60 mounted upon the rearwardly extendingarm..-or platform 45, and weighted and positioned. tov partially, butnot. completely, counterbalancev th e weight of. the cutting cylinder. A certain amount of weight isfd ired in. the cut-ting cylinder to maintain .it' in posi'tion in the sand, pile and to stabilize it as it cutsits way through .the pile, and while it wouldbe en- ;tire ly possible to completely counterbalance this cylinder, I have. found that a still better construction is. to partially counterbalance the cylinder as, here shown.

.fRemovablysecured tothe shaft. 61 dfothe motor is a shaft 62. Which'inturn'isremovably secured to a. shaft '63:.enteizing. the. case .54, andcarryingfa wormc65 \whi'ch:engages and drives the worm gearf52. It-'willihe understood that a flexible..cable.j66 -willllead from ;the motor to suitable.-switches carried in a casing 67 on,.a-=.dashboaiidr 68pimounted centrally off. the vehicleand. adjacent .toQthe operating. handle :22 of. the transmission; so that an operator when standings-or; sitting upon the, platform 69,at thel rear..of the;ma

chlne. can conveniently control .the transmission. .and the operating :switchfor. the n motor 66. [Similarly the motor; SiSQcontrOlled from aswitclt located in thesame casingl67. I

Oneoftheimportantfeatures-of, .the presentmahhineis therarrangement of the .units aboutlhe ShaftAGIin-LSuch a way that the cutting cylinder is master-Wheels than would otherwise theiactionof these the operation of this by far. the greater part. of. the weightof the machine is'carried uporr this shaft and? therefore upon the large traction wheels 4a When in operation probably per cent of the entire Weighteof ilthe amachine is" borne by i the .tractloniwheels anil this allows the use of very much smaller and narrower follower or sible, and prevents any-cutting.or digging of .the floorof the "foundry "these wheels,

which in other machines, in which the weight isnot so distributed, hashbeen. found to, be a seiriou's. id'isadvantage. fItiisfin possible, or. at least very undesirable; toiuse very large casterwheels,.an.d caster wheels-of the usual. types are suflicientlysmall andnarrow so that they digintozthe,softfloors of: the jfoundryz very readilyinthe usual. machines. v

iThe f-frarnework... upon which a is carried the cutting cjdinldenand motor there for may be lifted jfrom' the position-shown in .F ig. --1

into ,a .-positio n with: the. cutting cylinder sufbe pos operated indepeimlentlyso that the, machine r maylbe conveniently run from one. point of the I'foundry. to..the.. other without operating the cutting cylinderfduring. thisztravel.

The action/of. the cuttingmylinder, ,shown in'Figs. 1 andz-2, as it.advancesuntmasand pile, .is .to .cnt successivelnarrow slices of sand' from. the faceuo'fnthe pile,.then .worm or screwtheseisheestoward the centerofthe cut'ting cylinder, an'diQat: the. center to discharge. .thetwoisliees "of. sand rearwardly behindL-the. machine. It; is. understood. that .the machine. is :traveling. in .the :direc'tion of the arrow AL,in Eig.., 1. and that. thesarid. :pile is in front .of themachineiand .is cut during thisiadvancing movement ..of :the machine v andithrownioutbehind .thecutting. cylinder andflleft'in aridged :heap.

-The cutting :cy linder I has its .'..bla.des- :80

inclined .to acradial planeat each :point,.and blades is. to. slice into. :the sand. pile-1 at'. an angle instead offia tly. L This requires. verynmu'ch less .power rand 'fi'ects. .a

throwing" Ofihe "sand i the center of i the. twocylinders rather..than. a. slow worming or. rollingover ofthe sand as it is moved towardithecenter. A'ffurtheri difference in type of cylinder is; thatthersandiscrossedatthe centenofthe cylin: I

de r,-.that-.is, the .sandQIfminone ..side of the original heap is scattered to agreater extent than before across the center and over to the other side of the heap, although with both types of cylinders the sand is left in a ridged heap v By supporting the greater portion of the entire weight ofthe machine on the large traction wheels, and by providing" a balanced drive for the two traction wheels, that-is, a direct drive to each wheel, I have found that it is unnecessary-to provide any equalization between the follower Wheels 5. The frameworkof the machine is sufiiciently rigid so that if one of the wheels5 passes over a recess in the floor there isno, tendency of the drive, as would be the case if only one traction wheel were driven, to tilt the machine into this-recess, and the follower wheel will simply pass over the recess, b-ut without dropping into it and without placing any undue strain on the framework of the machine. In addition to the above advantage the use of the extremely heavy square shaft, upon which .both the traction wheels and the cutting cylinder are mounted, maintains these parts in perfect alignment at all times and prevents the very severe racking of the machine, which is a serious objection in many sand-cutting machines, due to the weight and unequal resistance which is met with by dif ferent parts of the sand-cutting cylinder, and which tends to swing the cylinder in its sup ports and to thus strain theentire framework and to cause misalignment from the bearings of the cutting cylinder and from the wheels of the machine. i j I Other modes of applying the principle of my invention may be employed instead of the one eXplainecLchange being made as regards the mechanism herein disclosed, providedthe means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and dis tinctly claim as my invention 1. In a sand cutter, the combination of a frame, wheels supporting the same, a sand cutting cylinder rotatably mounted in said frame, said cylinder having two series of blades, each terminating closely adjacent to the center of said cylinder, and driving means including a shaft operatively connected to the center of said cylinder between said two series of blades.

2. In asand cutter, the combination of frame, wheels supporting the same, a sand cutting cylinder rotatably mountedin said frame, said cylinder having two series of blades mounted on said cylinder, each terminating closely adjacent the center thereof, and means including an element mounted on said cylinder between said series of blades and a shaft operatively engaging same, said means being adapted to rotate said cutting cylinder.

3. In a sand cutter, the combination of a frame, wheels support-in thefsame, a sand cutting cylinder rotatably mounted in said frame, a driven element mounted centrally on said cylinder, two series of sand cutting ele ments mounted on said cylinder and terminating closely adjacent said driven element, and means including a. shaft at right angles to'said. cylinder,.said shaft-engaging said driven element for driving thessame and said cylinder therethrough.

4, In a sand cutter, the combination .of a frame, wheels supportingtlie same, a sand cutting cylinder rotatably mounted in said frame,.two series. of sand cutting blades, said series being mounted on said cylinder and be ing slightly speced'from each other at a point adjacent thecenter of said cylinder, a worm gear fixed to. said cylinder between said two series of blades, a worm engaging said gear, and means for driving said gear. i

5. In apparatus of the characterdescribed, the combination of a sand cutting'cylinder including twoaligned members provided with polygonal adjacently disposed ends, opposed spiral cutting blades mounted on said members ant radially spaced therefrom, the ends of said bladesoverlapping the polygonal ends of said two aligned members, a hollow driven clement provided with a'hub, said polygonal ends of said aligned members being slidable but non-i'otatably engaged in said hollow d iven element, a worm wheel mounted-on saidliollow driven element, and a worm disposed withinthe adjacent ends of said cutting blades, said worm beingindri'ving' engagement with. said worm wheel. 1

6. In apparatus of the character described, the combination ofa sand cutting cylinder including two aligned members provided with polygonal adjacently disposed ends, opposed spiral cutting blades mounted on said two members, said blades being spaced radially from" saidmembers and having their adjacent ends overlapping the same, a hollowdriven element provided witha hub, said polygonal ends of said aligned members being sl-idable but non-rotatably engaged inhsaid hollow driven element, a fixed casing enclosing said diven element, bearing means mounted in said'casing and supporting said element, and means including 1.WOTII1 -3I1Cl worm gear mounted in said casing and driving said driven element, said worm gear being disposed at right angles to the plane of said two aligned members and lying partially radially within the adjacent ends of said spiral blades.

7. In a machine of the character described. the combination of a frame, a plurality of wheels including a pair of traction wheels supporting said frame, a shaft rotatably mounted in said traction wheels, said shaft being oscillatorially mounted in said frame, a

sub-frame fixed to said shaft and extending oneithenrsiiiecthereofga :sand: cutting 'cytin- .deramnunted: in: said subizfiramevenone side of said said: cylinder s-including two opposed spirahblades terminating adj acent the centerl on the same; azmotor mounted on the other side" of said iframe from said cylinder,

said ymotor beingMeighted; and; positioned to partially counter-balance said cylinder, and means connecting: said motor randv cylinder whereby the "former. may operate J the latter, said means including mechanismidisposed between'theiadjacent ends of said spiral blades.

8; In ama'chine of the character described,

the combination. of aframe, a plurality of .wheel'sincluding a pair of traction Wheels sup porting said frame-,-a shaft rotatablymounted in said traction wheels, said-shaft being oscillatorially mounted in said frame, a sub-frame fixed to said shaft and extending on: either side thereof,la sand cutting'cylinder mounted in said sub-frame on one-side of saidshaft,-

said cylinder including'tWoopposed spiral blades terminating adjacent the center of the same,.a motor mounted on the other side of said frame from said cylinderv and centrally with respect to said cylinder, driving means connecting said motorwith the center ofs-aid cylinder for operating the latter, said means including mechanism disposed between the adjacent ends ofsaid spiral blades, said motor beingweighted and positioned to partially counter-balance said cylinder.

" 9. In amachine of the character described,

.'the combination ofga frame, a'plurality of wheels including a pair of traction :wheels supporting said :frame, a shaft rotatably mounted in said traction'wheels, said shaft being'oscillatorially mounted in said'frame, a sub-framefixed to said shaft and extending on either side thereof, a sand cutti'ngcylinder mounted in said sub frame on one side o'f'said shaft, sai'd: cylinder including two opposed spiral blades terminating adjacent the center 1 v of the same, av motor'mo'untedon the other side of: said frame frOm-said cylinder and centrally with: respect to said cylinder, driving meansconnectingisaid motor with the center; of said -cylinder for operating the latter; said means including" mechanism dis-v posed between the adj acent ends of saidspiral blades, sai'd rmotor being weighted and posi-' tioned to *parti'aily eounter ba ance saidcylinder,-:and-manua lly operatd means flia-ptd to oscillate :said sub frame and fm the same" in any de'sired pe'sition.

- '10. '-'In amach-inedf theeharaeteitdescribed,

the combination of a frame comprising spaee d para'llel side --members, spaced transverse members-connecting said; side members and said side members extending a substantial distance beyond said transverse members, wheels meunted bnsaid frame-and supporting 1 the I samefa :r-igi'd' shaftsp royide'd with a polygonal portion." intermediate its ends rotatablyz.-mountd in and bracing together said side members 'ofsaid"framef-traction wheels -reta-tab1y mounted 'on'jthe extending ends df'saidshaft,andysandcutting means fitippoi-ted cnsaid'rrigidfshaft; j

. 11. In :a 'machine -of the; character desciibed, L the" combination of a 'horizor'ita-lly disposdfrarne comprising two spaced par? r'allel side: members, -a-- t-ransverse' memberr secured to said 'side'members: at-adj acent ends thereof, a'*seconditransverse member secured to said side-members intermediatetheirends, .a-Tigid shaftprovide'd witna centrally disposed :phlygon'al "port-ion, said shaft being oscillatorially mounted in said sideemembers at the otherwiseunconnected ends thereof and serizing to-eoimect "and -brace' said side members: against lateral distortion, traction wheelsgsupporfingsaid 'frame*and-= rotatably mountedon the outer endsof said rigidsha'ft, and a sand vcutting cylinder SE PPorted upon the, .polygonal'central portion of saidirigid shaft;

12, In. a machine of the character idescribedfihe combination of a frame comprising two spaced parallel side members, means connecting-saidtwo sideanembers, said means being disposedionmne side of-the "center of each of said two. 'sidermembers, thereby leaving the 'othenportions' f said 'side members 1n,a, parallel but unconnected relation, and

bracing means for-rsaid -extending1:por.tions of, said sidermembers' including a rigidshaft element-oscillatorially monntedin each of said" side membersgs aid shaft being adapted to"'-maintain* theextending portions of said sidemembers'in substantial rigikl parallelism;

Signed-by this 2nd day; of fApril; I927.

ZHQWARDFL'FWADSWORTH.

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