US1499426A

US1499426A - townsend

Info

Publication number: US1499426A
Authority: US
Publication date: 1924-07-01
Anticipated expiration: 1941-07-01

Description

my 1, 1924. 1,499,426 J. E. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2, 192C] 8 Sheets-Sheet 2 J1 /5 f /66/74/6 64 July 1 1924.

J. S. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2, 1920 8 Sheets-Sheet 5 July 1 Vv1924.

J. S. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2. 1920 8 Sheets-Sheet 4 .IlflH d..

.July 1 1924. 1,499,426

J. S. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May l2. 1920 8 Sheets-Sheet 5 July 1 1924. 9 1,499,426

.,l.` S. TOWNSEND SAND CUTTNG AND SCREENING MACHINE I Filed May 12 1920 8 Sheets-Sheet 6 July 1 1924.

J. s. TOWNSEND SAND CUTTING AND SCREENING' MACHINE Filed May 12, 1920 8 Sheets-Sheet '7 July l 1924. 1,499,426

J. s. TOWNSEND SAND CUTTING AND SCREENING MACHINE Filed May 12. 1920 8 Sheets-Sheet E Patanted July l; i924 UNITED STATE P EENT FFECE.

.TOEN S. TOWNSEND, 0F HARVEY, ILLINGIS, SSIGNR T COEPBATIGN, 0F HARVEY, ILLINQIS, A. OBATIOE 33? LHS.

5.5m) comma um scum@ Mcm@ To all' 'whom it may concern:

Be it known that I, JOHN S. TOWNSEND, a` citizon of the United States, residing at Harvey., in the county of Cook and Stale of Illinois. have invented a coi-tain new :incl useful im rovemmit Sand Cutiiig :md Seremi g Aziirliirw, of which the following is si s 3o fir-orion. Y l

IL is well und; @muil m the foundry lrt that after oasting has been done `im a foundry .find the oastin and flasks aiierefor are removed, the foun ry room is leftin a considerably rliszordoiod state as regards the lmolding;h sand in that it is in all sorts of shopos did silos ind llaa rit-foso pieces of casting; and olhoi' mai-o iai sii-oli Wfflga pleitos of broken cores, i-oils, amd. mixed with if., and tlm?, 'bom'e molding can italie piace the next; day this; sami luis o ne cleaned of this ofuse, wei flown. anni thor nughly x'nixeil and aeratad or cui) :mail mii:

`in convcniont piles. The objoct oi" iii in; `volition is to piwhvide a. machine piefrebly selfproxallod which can be driven thru the foundry to automatisally romovo imm it by screaming all refusa maeriel, tliooiglily mix it after ii'. im?, been empeiofi im finally deliver it in ow along lao foundry floor in condition to oo ro-used in he further making of castings,

Tha invention consists in a machine for accomplishing this objaot *willich is a seifcontained imcliine in that it can be controlled by :1 Single opomtoi Tiding upon it, and pass thru the foundry tog pfiform all of the ilosii'od functions?, Molo piaimllaily the invention consists in novffl lemons in the unitary mnoliire for poii'l'aiixiirig oxwli of :i sepan-aio olimoiiu'y iiiihiim {mier} g; intr] tho oon'lplef opoi'aximi of flu mili-o 11mA chino. AS ffii@ izificliiiiia'is qui@ romplioziml as :i wimlor` ounininii'ig ronny (livisionrl nul separato ports, lla@ fifuimvo of omolty will be more YFully sol foitliiii lli@ spmiiicution "and claimirolziting; to ouch Suction fr part of the), machine.

Rofoi'iing lo the eight sheets, of Lli'uwingi in wliioh lio samormmeinls represent the somo paris thruout lio sovfz'ol lows,

Figure l, is zi Sido imi nl' :i roiiiplo'or11:` chime illustrating' liis inw-mimi in iis` prV ferlod 'oim.

taken from the mai-yi, o. he right hand end of E gur L Figuie a horizontal plan View partly in Section aoioss Figure L opproxk mately ius bolow sie sommi. v'

Figura iS Sile Elev' tion correopoiing to Figure l init largely.' in SrL-@Lion lo man? of the parle a Figui@ detail View of tho diferfentil gearmecimnislu viewd in connection with tho {rive for tlm traction wheel.

Fig-uio 6 is a vertirzil 23nd View la. soci-ion, hilfen at approximately the lim of Figure l.

Figue l' is an and viow loolaisif the imola of the miic-hina, l n ulm' line in i'iofst, of ill@ 521ml soan omi ifi@ olriyimg wheol.

Figaro 5 u front .viaw of time mzwiino which fue machine piovided with electric,"

energy as iL moves about lie foimrlry floor. Figue i0 o plan View o ai com shown in Seotiol in the @fight hand end of Figure 11. Y Figure l1 a dtail viow largely ,in sei:- tion ol" a frioroii aiuta-,li and Worm goor drive times-@fon lle sume :ipeaying: atopigroximately the Center of Jigin'o the owar left band corner of the rotating semen. Y

Tho oi'iire iiiogzlezmism constituting lis iii.- enioii is mounted upon o horizontal 'i-mno coiisiissf" mimiirily of *um oppositsly flis posed @i il ifim:i`ri.a"-,is iti como wl sit ilu front of tigo :olii o Fiji' n Voli@ ihn Iiiifidlo my :i i plooi' anni an the regali l; u u

,Rigixilly ,zigniiofl w nml. mili m opposiic sidi of the lower pol-wm o! ing 2O are sl, flo 2 A WliQQlS joui-ir ii. Dopenriiog from wasting spaced zlpzir umso-lugs 2T l is loci-nml zi Yerionlly vof-kaf" volw ioiii'nfilorl on :i pin lill "USF" 1 piume only and so iiimmiwl in onli-i 'allow the rear wheels 32 to adjust themselves to irre larities in the surface of the floor travele These wheels 32 are located one at each end of the yoke 28 and are supported thereon by the usual knuckle mounting, common in automobiles, viz, each. wheel 32 is journaled on a horizontal shaft 34 projecting from a block 36, itself carried bv a veri horizontal tical shaft `38 ournaled in space bearings 40 on t e yoke 28.

The up er ends of these shafts 38 are also supporte at their upper ends by brackets 42 extending from' the yoke 28. As in common automobile practice, eac shaft 38 has projecting from it a. horizontal lever arm 44 and these are attached togetherby a connecting rod 46 so that the wheels 32 must move in unison.

The shaft 38 which is furthest from the operators station hereafter described, is also provided with another horizontally project ing lever arm 48 to which is pivotally' connected a connecting rod 50 running back across the machine. The opposite end of this rod 50 is pivoted to a lever arm 52 projecting from a rotatable vertical shaft 54 )ournaled in a casting mechanism 56 secured to the adjacent channel iron 16. Horizontally projecting from the upper end of this Shaft 54 above the castin 56 is an operators steering lever 58 provi ed with the usual locking mechanism 60 engagin a star wheel 62 of ordinary construction. T is lever 58 is located within easy reach'of the hand of the operator who stands u on a step 64 supported on the side of t e machine by any suitable means, as for instance, the angles 66. It is obvious that the operator standing on this platform 64, which will be 'frequently referred to as theo rators station, can by rocking lever 58 bac ward and forward in a lane so move the lever mecha nism described that the rear or steering wheels 32 are angularly moved with refer ence to the yoke 28, thus effecting steering ofthe machine in the ordinary way. The lever 50 is of siicha length and the connections are sufficiently loose so that the yoke 28 and the wheels 32 can rock up and down in a vertical lane sutliciently to allow for irregularities in the floor or ground passed over b the machine without destroying the control'of the shaft 54 and consequently the handle lever 58 on the wheels 32 in their different vertic positions.

Rigidly mounted on the hub of cach wheel 26 is a gear wheel 68 meshing with a pinion 70. One of these pinions'i's carried on a apart l shaft 71 and the other pinion is mounted on an op itely disposed aligned shaft 72, the tw ing connected into a. differential meiihanism 74 shown in detail in Figures 5 and 7 but of. standard commercial construction and therefore not described in specific detail. Any other standard differential mechanism for this purpose may be used Without departing from the invention.

This differential 74 carries the usual exter- -screws 84. These bracket members 83 just described, as clearly shown in Figure 7, also afford bearin supports 86 in which the shafts 71 and g2 are journaled at their inner ends.

On the opposite end ofthe quill from pinion 78 is a sprocket wheel 88 over which passes a sprocket chain 9.0 leading to the rear of the machine Where it also passes over another sprocket wheel 92. This sprocket wheel 92 is rigid on shaft 94 journaled in four separate brackets or bearing

frames

95, 96, 97 and 98 rising from cross member 22. This shaft 94 is selectively driven at two speeds forward and one speed backward b an electric motor 100 carried on a suitab e bracket or platform 102 projecting from cross member 22. The connection between the motor 100 and Ashaft 94, permitting this speed and direction changing is as follows Motor 100 carries pinion 104 which drives gear 106 carried on a short shaft 108 journale in supports v95 and 96. Short shaft 108 carries a pinion 110 meshing with gear 112 on a shaft 114 carried in all four of the brackets 95`t`o 98, heretofore referred to.

0n this shaft 114 and between

supports

97 and 98 is mounted a double clutch 116- 116. Between the members 115 and 116 which in the drawings represent standard parts of a commercial clutch mechanism of this type is the usual reciprocable double cone 118 shiftable backward and forward in the ordinary manner-by a lever 120 convenient to the operator when standing on the. operators platform 64. As will be described, each of the members 115 and 116 has a train of gearing attached to it, and the operator in the usual manner selectively uses the desired one of these sets of gearing by properly shifting the lever 120 to correspondingly shift the cone 118.

Clutch member 116 is operatively con nected with the gear 120 meshing with the gear 122 on shaft 94. When the parts are thrown to pro er position so thattho motor 100 operates tliis train of gears thru clutch member 116, the wheels 26 are driven in a clockwise direction as viewed in Figure 1, and the machine moves what is herein designated as rearwardly to draw the sand cutting and elevating mechanism away from the work. This train of gears 120 and 122, is in the particular case here illustrated so proportioned that the machine moves relatively fast in this direction, thisin view izoI of the fact that no work sand pile. v.Clutch member 115 is operatively con nected to pinion 124 meshing with the gear 126 on shaft 128 journaled inA supports 97 and 98. This shaft 128 carries two

pinions

129 and 130 of different sizes meshing respectively with gears 131 and `132 freely journalcd 0n shaft 94.

Slidable lengthwise of shaft 94 between these

gears

131 and 132 which are, by the way, of different siies,l is a clutch mechanism 134 shiftable by hand lever 136 under the control of the operator to cause said clutch 134 to operatively engage either the gear 131 or the gear 132. I

In actual practice the two trains of gears 13G- 132 and 129-131 are 'so-proportioned that when one set of gears is in use the s eed of the machine forward, viz, tothe leflt, as viewed in Fi ure 1, is about is being done on the twice as fast as when the ot er set of gears is in mesh. This allows the operator, by properly manipulating lever 136 to thus selectively vary the forwardworking speed ofthe machine to take care' of varying sand conditions on the floor or in the 'foundry Where work is being done. v

' The motor 100 is su ledwith electric current-from any suitagltl source delivered to it thru4 a supply cable 13S-connected at its end outside the figures shown to a lined oint source of energy-this cable 138 being divided on the machine into separate wires 140, leading to the motor 100 thru any sort of electric control mechanism ordinarily required in electric .motora the same no t enteringinto` Vthis4 invention and therefore not ,shown in'detail. In iorder to keep the cable 138reasonably tight in all positions of the machine in the foundry where it is working and thus avoid tangling of the cable vwith the machine1 the mechanism shown at the top of Figure 2-and in detail in Figure 9 keeping the slack of the cable reeled up. The mechanism for doing this comprises a drum or reel .142 mounted on a shaft 144 journaleduin suitable bearings 146 carried by the frame mechanism. This sha-ft 144 is rotated byv a sprocket chain-drive 148 from shaft 94 which it will be remembered only rotates when 'the macl moved. over the floor.

The detailed mechanism driving sprocket chain 148 which performs its work isof considerable importanceg 1- The upper portion of the chain passes over a sprocket wheel 150 freely' rotatable` on shaft 1441but pressed into 4frictional engagement with a v disk 152, rigid on shaft 144 thru the aetionzfof a. compression spring 154. The disk'1'52 carries on its face adjacent to` the wheel 150 cork plugs 156 which afford a frictional yet yielding'eontact with the face ofthe wheel 150 so that is provided for constantly,

.struction having oppositely fthe usual screen material line is 'being wheel 150 can rotate angularly with reference to the disk 132 but is retarded by the frictional engagement caused by th-e spring 154. The result of this construction is that assuming that chain 148 is operatively driven by shaft. 94 the chain will cause wheel 150 to rotate disk 152 and thus wind up cable 138 just as long as there is slack cable to be so wound, but that when this operation is completed further rotation of shaft 94 merely causes wheel 150 to slip on disk 152 and thus prevent breaking injury to cable 128. This also allows for the unwinding ofthe cable 128 off from `the drum 142 whenever the machine is runningin the right direction for this. Under this condition disk 152 and the wheel 150 actually rotate in opposite directions.

Sprocketchain 148 is operated and connected to shaft 94 by passing over 'a sprocket .wheel 158 which is detachably connectible to shaft 94- thru a latch member 160 which is also when rotated thru 180 from the operating position shown in Figure-2, a. crank handle by which the operator may rotate s 4arocket wheel 158 to independently manipu ate drum 142 without reference to the rotation to shaft 94. This latch member crank `handle 160 is for this purpose L-shaped, as shown, and is' pivoted to one side of the sprocket wheel 158 at 1 62 so that wh`en the member 160 is rotated in a clockwise direction thru 180 from the position shown in Figure 2, the hand grip member 160 may be readily taken hold of by the operator for operation as desired.

Tho it forms n o part of this invention it may be Statedthat the current delivered by cable 138 reaches wires 140 thru three controller-rings 164 in continuous metallic contact 4with the usual controller fingers 166 clearly shown in Figure 2.

The sand screening or riddling mechanism is a metallic frame of standard condisposed

metallic rings

168 and 170 spaced apart by connesting rods 172 between which is mounted 174. The forward end4 of this riddle is mounted on rollers 176 carried by the frame of the machine. The ring 168 rotates upon these rollers. The rear 'ring 170 is carried by a suitable saider 178 from a hub4 180 rigid upon a sha 182 journaled in thebearings 184 formed at the upper end of member 97.

The right hand end of .shaft 182 carries aliand lever 200 under the control of the operator. l 'properly mani.pulatinzig'V this lever the operator can' cause theriddle to be rotated or remain at restasile desires.

This lever 200 also simultaneously sets the elevating mechanism 1 to' be lhereafter de-`V rotatable sweeping lblades I'or .ironmeii scribed, in operation; This'letter o leration is accomplished thru the fact thatt ie vshaft 190 carries a sprocket Wheel202 overwliieh over an'other s 4rocket wheel -206 mounte on the main sistt208 whichdrives the elevator mechanism to'be hereafter de-A scribed. 4 f

Sliaft208 is journaled in suitable bearings 210 supported. on opposite sides, of

the Vframe inconnection withmemberV 18, heretofore described, Tand diagonal braces' 212', rising from the side channel irons,

clearly shown in 'Fi ure V1.

i Rotatably'mounte on shaft 20S intermediate between the side m*embersv ofv the frame 18 are two block bea1i1igs214', eleai'ly shown in Figurell; 'Slidablyni'ountedon opposite. sides of each one of these block bearings'is 'an elevator freine member-.216 made up of two separated parallel members connected by. s'p'acing`nienibers 218. This frame member 2,16 is nioval'ale z -lonvitudinailly of the bearing' block thru 'tie agency of a rotatable 4screw 2 2() hearing at one. end" adjacent the block4 bearing and threaded thru a stationary In? 222 oiija Y rigidA cross member 224 of t i'rame.. By applying a wi'eiichito the noncircular end 226 ofthe screw it inayc'be rotsted` in either direction. thus"causii'ig-.they l b lockjb'earing and consequently'f the entire.

elevator frame to move 'toward-jor from* the bearing block; 214i f and conserieiitly the shaft 208, 'As there is 'one'ofji `ese-screws 220 t'oieach side 'of the elevator fit-is '0badapted When'the sprocketfirflieelsf230 and;

' vious'4 that yby rotating both'gsc'r'ews Itho' enf tire. elevator lwill be raised 4or lowered .with reference to the shaft 208.4 This is done for the purpose of tigli'teningthe respective sprocket chains. 22S-Which pass over sprc'iclwtV wheels '230r atithe top 'ot the elevator and' 232 at the bottom of the elevator. The two sprocket chains .228 -have suitably .'coniie'et= ed to them transverse'elevator buckets 234 232 are rotated in a .clockwise direction," as viewed in Figures 1 and-2,. tojserapeviip ma terial .at thebott-omfof tlie'eleva'todrarry it' fip" the outside or 'left hand side lof the elevator'and over tlie topof the.' sprocket wheels 2301at=a suliicient s 4eed to cause the contents-of the buoletat' e-toptolbe dis- 4charged 4into the seree'nl'or riddleheretofoe described.

` ferred to,V are' 'carriediipon" -a horizontal ie elevator' The sprocket-Wheels heretofore re-r end of the eleva-tor' frame; 'I The shaft l l is of considerably greater length than the' Awidth of the main elevator frame, viz: the

distance between the members 216,v4 This surplus length' of shaft "236 'is occupied 'by' 242 well lrnownin the art so positioneda'nd arranged that' the blades on eacligset sweep l sa'iid or other materiel'engaged by themto-- Ward tlieoenter of tliedevice. into the'patli' of travel r of the fbuekets' 234 4so thatthe'.' buckets can take u the material .gathered bythe ironmenran -deliver'itinto the 'rid (lle.

lieelevator mechanism is positioned as -to lieifrht with reference ,to -tlie` floor or by being 1 'rocked singularly about ground tl'ieaxis 'of shaft 2G81 This movement is'V of the elevator frame projecting .truniiions 244 ou.l each ofv Whicligi'sV journaled a 'gengated slot- 248 thru which assesa vshaft-.2512) herl 246tlie result beingv that when shaft 250 is rotated, as hereafter.-deseribecl,1 the" pinionforces reel; 256mm travel: horizon- 4 tally over-the; pinion, -tlii'is reci'proz:ating in either direction desired;4 .the member [246,

and .conset]uently the elevator mechanism. The shaftiO isldriven-in either'direction4 at 4the will' of: the operator, thru any s'uit 4ablesort of ameeliaiiismoneformot which Thesliaft 2,50cari'ie's a Worm icov ica4

sleeve 4carries -a l .pair of oppositely disposed liioV I 'Y i y sproketchainrieelianisiii' 4278 to shaft i 114,lieretofoie described,-

when -the operator, lby mea-ns hereafter del rocks. the elevator .mechanism about "shaft .-so that rotation'pf shaft :114fcontinuouslyq rotates friction d1sh12i2- with thief,result thatfA 208as a centerand'.thns'jiiivethe iroiimeii e subseries dismiss mi sem-the suor es desired; Y.

1,2j12and @elevator to '-properfworking posi-'j Y .tion adj scentgto vthe 'door' or :tojJ elevate them,

The special advanta e of using a friction drive between the resective gears 272 and- 2@i and SH2 and 271 is to ermit slipping, thus preventing breaking W en the elevator is moved to the limity of its stroke in either direction as defined hy the length of the elot- 248 and also to allow for trouble in the event the operator attempts to raise the elevalor against obstructions on the loor in the path of the adjacent bucket 234.

The sleeve 268 and attached parts, here-- toforc. described. is reciprocated along the shaft 264 thru the lever and cam mechanism shown in Figure l0 and at the right hand end of Figure 1l. A. lever 280 is rigidly attached to a collar 282 rotatable on the sleeve 268 and held against endwise movement thereon by a collar 284- held in place by a. pin 286. This collar is rotatable inside of a bearing 288. suitably supported. Thru this bearing 288 is an elongated cam slot 290 thru which passes apin 292 entering collar 281V. From au inspection of the parts just described it will be seen that b rocking the lever 28() and consequenty partially rotating collar 282 the collar must travel lengthwise-of itsell= a distance equal (ill to the length of a cam slot Q90, and*this forces the sleeve 268 to travel lengthwise an equal distance (because the collar 282 bears on the collar 28e at one end and on the. dial; Ql at the other).

liever 280 is reciprocahle thru n connecting rod 29emanipnlated by a hand lever Y296 in easy reach oi the operator. In practice the operator takes hold of this hand lever and holds it in the required position tor engage

disks

272 and 271. or E272 and Q as required to makethe move ment of the elevator he sires: The rest of the time he leaves the lever alone and the frirtional engagement only between the disiis, heretofore described. prevents siccidents.

ne important feature of the invention lo provide easy means for insuring very shorl'fturns of the machine in passing over the foundry Hoor. This is accomplished by providing each driving Wheel 26 `with an independent brake so that by applying the brake to one driving wheel. leaving the other free, the machine will turn very rapidly shout the brained wheel a pivot. This hrahe mechanism consists of a pair of inderendent brake ,shoes and 300. independenly operated by independent oottreadles Elli and T504 within easy reach of the operator. .ln carrying out the details of this device both brake shoes operate about the central axis of the cross shaft 306. This shaft is the operating member for brake shoe E298 which is rigidly attached to it and is merely the pivotal axis for the brakeshoe 300. Obviously treadle 304i is eonnected to lever 30S to rotate the shaft 306 to move brake shoe 298. Similarly treadle 302 is connected to drive brake shoe 300.

The body of the screen or riddle is enveloped on its opposite Sides by

dirt retaining walls

310 and 312 terminating at their bottom in a downwardly and rearwardly extending chute 314 adapted lo direct sand passing thru the riddle to the end of the chute into a pile midway between the supporting Wheels of the machine.

Across the machine at a point below the riddle and leading to one side thereof is a coarse material chute 316 adapted to receive coarse material which does not pass thru the riddle and carry it olf to the side of the machine. In the particular case illustrated in Figure 2 the end of this chute is detachably iosable by door 31.8 adapted to retain this coarse material at the end of the chute until the operator is ready to remove it from the machine.

Operation The motor l0@ runs continuously in one direction. The operator by properly manipulating the lever 120, as described, causes the entire machine to travel backward 0r 1 orward as he desires. Before starting forward or while the machine is running extremely slow he can by manipulating the lever llt change the speed. By manipulating lever Q00 the operator causes the motor to operaie the screen and elevator. By reversing this lever he stops these. orly manipulatingT the lever 29S the operator raises or lowers the elevator with reference to the floor, the parts being;` locked in desired position b v the Well known lockingr action of the Worm and gear Qlm. In addition to the foregoing the motor automatically takes care of the drum 142 controlling the supply cable for electricity' leading to the machine. ln addition the operator steers the machine thru lever 58 and by using one or the other of the treadles 30:9. and 3M facilitate turniing;r action.V The result of the foregoing is that the compact machine shown and de` scribed can he moved in any direction. and do the Work required, with a maximum elliciehcy.

Havingr thus described my invention what I claim as new and desire to secure by Letters Patent, is

l. In mechanism of the class described, a supporting frame, an elevator mechanism pivotallv mounted` near the top of the frame so that its lower rnd can swing toward and from the frame. and a pair of rods on opposite sides of the elevator slidable approximately horizontally thru the frame, a rack on each rod, a shaft mounted in the frame having a pinion adjacent to cach rack, a power shaft adjacent to the first mentioned shaft, a reversible friction drive mechanism between the power shaft and the first men- By propi tioned shaft, and means for :selectively movquently the mac me along the floor, variable i riddle carried* by the whic in said friction drive mechanism to deter mlne in which direction thepower shaft shall move the first shaft and consequently the elevator, for the urposes set forth.

2. In mechanism o Ythe class described, a supporting frame, wheels supported for movement over a foundr iloor, a rotatable riddle carried by the me, an elevator pivotall mounted adjacent to the end ,of the ridd e equipped with sand cutting means for athering sand -onto the elevator from it is delivered to the riddle, a sin le motor carried on the machine, means which' said motor drives said riddle and said elevator, means by which said motor propels the su rting wheels andconsegear mechanisms between the motor and the wheel supporting mechanism by which the operator 1n a single o erator's station on the machine may vary e direction and-s of the machine, and means controlled by the operator of the machine at said station for starting and stopping, reversin tion and varying the speed: of the machine, starting and stoplping the riddle and elevator for varying t e angularity of the eleva-- to 3. In mechanism of the class described, s suppertingeframe, wheelsA supported for movement over a found ame, an elevator tion, and varying the s floor, a rotatablepivotally mounted adjacent to the end of the riddle equipped with sand cutting means for atherin sand onto the elevator from whic it is elivered to the riddle, a si le motor carried on the machine, means y which said motor drives said riddle and said elevator, means by which said motor propels the supporting wheels and consequently the machine along the door, variable gear mechanisms between the motor and the wheel supporting mechanism by which the operator in a single operators station on the machine may vary the direction and s y of the machine, and means controlled by the operator of the machine at saidY station for starting and stopping revel-sin the direcof t e machine, starting and stop ing riddle and elevator for varying t e angular-ity of the elevator, this in 'combination with an electric supply cable leading from a fixed support to peed the machine, and an automatic winding mechanism for thecabe driven' il); the machine, keepng the cable tiht in a positions of the machine within t cable.

In witness whereof, I have hereuntosubsgribed my name in they presence ofv two witn L o JOHN S. TOWNSEND. Witn:

Dwmm' B. Cmvn,

Arma Rossmann.

e length of the f