US2169612A - Combination scraper, carrier, and spreading machine - Google Patents

Description

Aug. l5, 1,939 w. K. MQMIEEAN COMBINATION SGRAPER, CARRIER. AND SPREADING CHINE Filed June 2,5,l 1934 2 Sheets-Sheet 1 JNVENTOR. 72m

Aug. l5, 1939 vw. K. MCMILLAN COMBINATION SCRAPER, CARRIER, AND SPREADINGIAGHINE 2 Sheets-Sheet 2 Filed June 25, 1934 directly to the frame.

Patented Aug. l5, 1939 UNITED STATES COMBINATION SCRAPER, CARRIER, AND SPREADING MACHINE Wesley K. McMillan, San Francisco, Calif., assignor to Emsco Derrick and Equipment Company, Los Angeles, Calif., a corporation of California Application June 25, 1934, Serial No. 732,223

24 Claims.

My invention relates to the art of gathering, carrying, and discharging earth or other material, and relates particularly to earth handling apparatus which are used for scraping, levelling, transporting, and discharging earth, such as are commonly employed for levelling of ground, for building roads, excavating, grading, filling in, etc.; and my invention relates more particularly t o a heavy duty earth scraper by means of which large amounts of earth may be economically handled.

It is an object of my invention to provide a machine which Will gather, transport, and dump unusually large, amounts of material with the expenditure of but a minimum amount of power.

In earth scrapers of the type in common use a large expenditure of power is `required due to the fact that as the earth accumulates in the earth gathering or receiving means, this mass of earth must be pushed rearwardly into the gatheringor receiving means in order to accommodate additional earth.

It is an object of my invention to provide a machine in which it is unnecessary for the earth as it is gathered to push rearwardly into the earth gathering or earth receiving means the mass of earth which has previously been accumulated.

It is another object of my invention to provide a machine of the character mentioned including material carrying units or compartments which are moved into receiving position, yand when lled are moved into carrying position, and an other unlled unit or compartment moved into receiving position. l

It is another object of my invention to provide a machine of the character pointed out in which the material or earth is retained in thev material carrying units or compartments -until the operator is ready to discharge ordump the load, and

in which the material is then dumped directly from the machine at the desired location.

It is a still' further object of myinvention to provide a machine in which the digging and gathering stresses are transferred directly to the frame of the machine rather than to the material carrying umts or compartments. -This object of my invention is accomplished by the provision of earth removing means or a blade which is independent of the material carrying units or compartments and which is preferably secured It is another object of my invention to provide an earth retaining means which cooperates with the material carrying units or compartments in with one end of the frame, can be raised or lowered to regulate the depth of cut madeA by-the scraper when scraping and loading and alsov to regulate the position of the scraper above ground when unloadingso that the' scraper may function as a spreader; to provide means on the frame forsecuring and retaining the egravel, sand, or other material scooped up by the scraper, said means comprising a multi-compartment ro tary drum or carrier; to lprovide power actuatedhrneans for imparting a step by step rotary motion to the carrier to bring the carrying compartments successively into loading position;

and further, tov provide means for retainingthe material in the respective compartments of the carrier during transportation from the place of loading to that of unloading. A I

In the course of the following Ydescription I will describe ing-detail one specic embodiment of my invention which includes the various featofore. f

In addition to the preceding,other objects, advantages, and particular features of my inven tion'will be pointed out inthe course of the following description.

I believe my invention to be broadly -new yin its entirety and in certain novel subcombinations which comprise the whole. My invention may .be embodied in different forms, and thereforeI I do Anot wish to be limited to the specific embodiment disclosed herein, but wish my invention to' be construed in accordance with the spirit and scope of the appended claims.

` The combination scraper, carrier and spreading machine is shown by way of illustration in the accompanying drawings, in which- Fig.A 1 is a side elevation of the machine.

Fig. 2 is a rear end elevation.

Fig. 3 Vis a view similar to Fig. 2 showing the rear lifting frame and the hydraulic jack mechanism removed.v Fig. 4 is a plan view of the machine.

tures, objects, and advantages pointed out herethe drive shaft and 'the bearing supporting the same.

Fig. 'l is a cross section taken on line VII VII .of Fig. 6.,

Referring to the drawings in detail, and particularly Figs. 1 and 2, A indicates amain frame consisting of a rear cross plate 2 and a pair of side plates 3 3, the forward ends of which are broughttogether as indicated at 3a. to terminate in a goose neck 4. This neck is secured by means of a swivel connection by a pair of front wheels 'I and as such forms a support for the forward end of the frame; the

rear end ofthe frame being supported by a' frame B, supportedby a pair of rear wheels 8 in a mannerhereinafter to be described.

Disposed within the main frame A between the side plates 3 '3 and just 4ahead of the rear cross plate 2 is a cylindrical shaped rotary drum 'or carrier C. This carrier consists of a pair of circular end plates 9 9 suitably secured at optated either in one direction or another, as will posite ends of a hollow shaft I0, which, in this instance, is square in cross section as shown in Fig. 7. Extending through the hollow shaft In is' a shaft which serves twofunctions, flrst'that of supporting the drum or carrier C, and secondlyr that of imparting a step by step rotary motion to thesame.

, The supporting and driving shaft is best illustrated in Fig. 6, and consists of a turned round portion or stub shaftl II journaled ina roller or similar bearing I2- secured in the side plate 3 of the main frame. The stub shaft is provided with' two square extensions I3 and I4, the extension I3 projecting outwardly and forming a support for the hub I5 of a driving sprocket I6; the hub beingsecured against endwise removal from the extension I3 by a thru bolt I1.

transmitted thereto. The

I4 has a plurality of angle bars yIll welded, or otherwise secured thereto, and these bars extend through a -square collar I9 fitting the interior of the shaft III, this collar functioning as a spline or driving connection between the shaft II and* the shaft III. The angle bars extend completely -through the hollow shaft III and their opposite ends are welded or otherwise secured to an extensionl on a shaft' identical to the shaft Il; that is, there are two stub shafts II j ournaled one at each side of the main frame, one stub shaft carrying the driving sprocket I6 and the other a driving sprocket IBa; the two shafts being splined by collars I9 to the central shaft I0 of the drum or carrier and as such form a support vfor' the `druln and carrier and alsoa' means whereby the step by step rotary movement is angle bars function t9 connect the stub shafts and also to prevent individual canting ortilting of the stub shafts in their respective-bearings. r

' The stub shafts Il connected by the angle bars I3 are removable in an endwise direction throughY either of the bearings I2 and this can be accom- -plished by removing' the sprockets Il and then pull on the opposite sprocket.

exerting anendwise l This feature is important as .it provides a-simple method of releasing the drumor carrier when it is to be removed for inspection, repairgetc. The

removable. They are opposite ends of the splined collars Il are'also freely insertable in the shaft Il and, when vso 5 to an axle 6 supported permit free rotation thereof.

Fig. 1, to a pointy almost directly -secured a scraper blade The extension y Y or digging operation struction. The crossplate between the side "plates inserted, their inwardv the bearings I2, which are also removable as shown,`h ence if the splined collars become excessively worn and too much play develops it is only necessary to remove the drive shaft and the' bearings I2. This leaves the splined collars free for endwise removal and replacement. Similarly, if the bearings I2 of worn they may be readily removed for repair or renewal.

-The manner of supporting and rotating the carrier having been described it is desired to point out that the carrier is divided into four compartments or material carrying units by a series ofcurved laterally disposed plates, such as' indicated at 2|, these plates beingL riveted or welded at their innerends to the shaft I and being similarly secured at their .ends to the circular plates 9. They are, furthermore, braced and secured by laterally disposed plates 22 which, to a -certain extent, divide each compartment longitudinally into two compartments. The outer endsv of the curved plates form scoops which dig into the material being'handled 'during the loading operation and as the carrier may be rohereinafter be described, double lips or scoops are formed by adding the curved plates indicated at 23. y

The rear transverse plate 2 is-curved as shown to conform to the shape of the carrier and to' The plate 2 exedge vof the frame, see below the shaft is formed and suitably 24 which is reinforced and supported by stools 25 in the usual manner. The blade 24 constitutes a material removing means which removes the earth from the surface over which the machine is operating and from which the material is delivered to the compartments or material carrying units. The blade 24 also acts as an earth levelling means during the dumping .or discharging operation, as will be described later. The principal-feature of securing the blade directly to the frame is that the stresses or forces incurred during the scraping are transferred directly to tends from theA upper I0. In its forward edge the massive frame rather 2 serves three func-- tions, first that of a brace or tie between the, side plates 3 3; secondly,

formed in the carrier, for instance, the compartments indicated at 2Ia and 2lb. L

There is a second curved pl te which extends crosswise of the frame, that is, which is disposed indicated by dotted lines at 26. This plateis resiliently supported by springs w28 and 'as such may yield in the event cobbles,. roots, pieces of wood, or the-like, become lodged between the the stub shaft .become than the drum conw that of a support for `the scraper blade 24; and third, that of an enclosure for one or more of the compartments l 3 3, and thatplate is lower edge of the plate andthe scoop endsl of the plates 2l. VThe curved platel26 serves as a closure for the compartment 2Ic. The plates 2 and constitute a\material retaining means of my invention. The only compartment which `re mains uncovered'is that shown. at however, partially closed by the bottom portion l of the cross plate 2 and the scraper 4, and considerable material can thus be carried whenV the other three\compartments are loaded.v The ald. rinse, 7

opening between the lower part ef the piate'zs 75 rial is received into the compartments and discharged therefrom.

In the operation of the machine as a whole, it is necessary to raise and lower the scraper 24 to regulate and cut and depth of loading and to also regulate its height 'above ground when unloading so that the scraper may function as a spreader. To permit such adjustment the rear supporting frame B is employed. The'rcar end of the main frame A is so connected with relation to the rearl frame B that vertical movement may be imparted and this is accomplished as follows.

By referring to Figs. 1, 2, 3, 4 and 6, it will be lnoted that a pair of channel-shaped tracks are `secured to the rear transverse plate 2, one at each end thereof, these tracks being indicated at 30. Disposed between the channel tracks are the downwardly extending arms of the rear frame B, and carriedfby the upper ends of said arms and extending into the channel-shaped track- Ways are rollers 32, said yrollers and. channel track forming an adjustable connection between the main frame and the rear frame whereby the main frame may be lvertically raised or lowered as occasion demands. There are apair of downwardly extending arms on the rear frameI at cach end thereof and these terminate in a hori` zontal bar 33, said horizontal bar and the downwardly extending arms on the frame being connected by cross bars 34 and crossing bars 35 so asto tie-the frame transversely and imparting the greatest amount ofA rigidity possible.v

The rear frame is supported bythe wheels 8 previously described, and when it is' desired to raise the rear end of the main frame -xyith relation to the rear frame, it is accomplished by a hydraulic jack mechanism comprising a pair of cylinders such as indicated at 40-40. The lower ends of the cylinders are pivotally connected to the rear frame. \Each cylinder carries a piston and a projecting piston rod 4|` and'thesey rods are pivotally connected to the main frame as at 42. Oil, air, or anyfother fluid medium is delivered tothe lower ends of Athe cylinders through a pipe, 'such as shown at 44, and when pressure is applied the pistons are extended, hence lifting the rear end of the main frame upwardly with relation to the rear framel or lowering it as occasion demand s.

By this mechanism it is possible to adjust the position ofthe scraper, either above or below the surface being traveled over.' and the scraper may thus assume `a cutting or scraping position or a spreading or leveling p osition as desired. It will be understood that a machine of this character preferably trails behind a tractor, or.

a like motor vehicle, so as to be pulled thereby. Any suitable type of drawbar, such as shown at 46. is employed to form a connection between the machine and the tractor. Tractors of varying makes are usually provided with a power takeoff 'shaft and where this is the case the power take-off shaft may be connected to the shaft indicated at 48. This drives a reduction gear mounted within the housing 49 and the reduction gear, in turnydrives a cross shaft 50 having sprocket gears at opposite ends thereof and through chains 5| power is transmitted to the sprockets I6 and 16d and to the drive shaft previously described. Any clutch mechanism not here disclosed may be employed'for transmitting power from the power take-oil? shaft to the shaft 48, hence making it possible to transmit rotary motion to the carrier C whenever desired. For instance, if the machine is scraping and loading, the main frame and the scraper 24 will assume the position shown in Fig. 1, and when the compartment 2id has been substantially filled power is transmitted to rotate the Lcarrier until the next compartment assumes loading position. In filling a compartment the drum may be held stationary until it is completely filled and then may be rotated in a counter-clockwise direction, referring to Fig. 1, that is, -forwardly and upwardly, or the drum may be rotated in a clockwise direction, thus carrying the gathered material rearwardly and upwardly. The operation ofthe drum may be intermittent or may be continuous; that is to say, the drum may remain stationary until al compartment is completely filled or it may be moved slowly so that as the compartment .is being. filled it gradually movesfin order that when filled another compartment is ready to be brought into earth receiving position. When the found compartment is' continuously moved, it is preferable to rotate the dru'm in a clockwise direction so that as, the compartment becomes iilled the earth is moved rearwardly and up- -wardly into such a position that it is carried in the compartment or material carrying unit. I

have made special provision on the walls of each compartment so that the material may be engaged and moved in either direction. When the drum rotates in a counter-clockwise direction .'the curved portion 2| engages and moves the earth, and when the drum is rotated in a clockwise direction the plate 23 engages the material and moves it rearwardly. It will be seen that the material, in any event,.is moved by being engaged by the walls of any one of the compartments rather than by additional earth accumulating at or in front of the blade 24, and for this reason the power required to pull `the machine and to dig and gather the material is greatly reduced. The rearcurved plate 2 which extends rearwardly from the scraper blade 24 is curved upwardly around the axis of rotation of the drum and constitutes a bowl into which earth gathered by the blade may pass lduring the forward movement of tile scraper. The drum, including the walls 2|, may constitute a loading means and during the loading of the scraper the drum may be rotated a clockwise direction in Fig. 1 so that one wall 2l moves rearwardly in the bowl 2 ahead of the earth which is being gathered by the scraper blade 24and passes rearwardly into the bowl.

downwardly and then rearwardly passes into the bowl to the rear of the earth and may be employed to push the earth rearwardly and upwardly into the upper rearward part of the bowl. When it is desired tcY dump the earth, the drum may be moved in a reverse direction, with t1f\1e result that the wall which followed the earth into the bowl now moves forwardly ahead of the earth, and the wall which during loading moved into the bowl ahead of the earth now moves forwardly in back of the earth and pushes the earth forwardly so that it may be dumped over the blade 24. When this is accomplished the hydraulic jacks are caused to raise the main frame so that the scraper will be supported at an elevation insuring plenty of clearance. The load may then be hauled whereverit is to be dumped and, if it is desired to level or spread the material as it is being dumped, the scraper can An adjacent wall which is moving and as it dumps the scraper again be vertically adjusted. Each compartment of the carrier is brought into dumping position blade spreadsland levels the material, it being understood that the carrier is preferably rotated in a reverse direction while dumping so as to insure complete remaval of all material.

Oil or other uid to actuate the hydraulic jack mechanism may besupplied from the tractor and the pipe M may thus be extended from the machine to the tractor to a pump or other source of supply and a multi-port valve, or ,the like, may obviously be inserted in the line to regulate the flow. i While certain features ol? the, present invention are more or less specifically described, I wish it understood that various changes may be resorted to within the scope of the appended claims. Similarly, that the materials and finish of the several parts employed may be such as the manufacturer may decide, or varying conditions or v uses may demand.

Having thus described myv invention, what I claim and desire to secure by Letters Patent is:

1. A machine of the character described comprising a main frame adapted to travelover a surface to be treated, a scrapervcarried by said. frame, a multiple compartment carrier to receive material scraped up by the scraper. means for imparting a step by step movement to the carrier to bring empty compartments successively into loading pontion rearwardly of the scraper and. to move the loaded compartment away from loading position, and means for' retaining material loaded into the compartments'until they are re- .turned to loading position.

2. A machine of the character described comprising` a main frame adapted to travel over a surface to be treated, a scraper carried by said frame, a drum-shaped carrier horizontally. disposed in the i'rameiabove thescraper, a plurality of laterally disposed plates extending longitudinally of the carrier and dividing the carrier into a plurality of compartments, means for imparting a rotary movement tothe carrier to `bring empty compartments successively into load- 'ing position rearwardly oi the scraper and to move the loaded compartments away from Vloading position, means for retaining material load ed into thel compartments until they are returned to loading position, .and means for elevating the main frame to raise the scraper out of contact', with the surface to be treated and to permit gravity discharge oi the material in the compartments of the carrier.

3. A machine of the character described comprising a main frame adapted to travel over a surface to be treated, ascraper carried `by said frame, a drum-shaped carrier horizontally disposed in the trame above the scraper, a -plurality oi.' laterally disposed plates `extending longitudinally of the carrier and dividing the carrier into aplurality of compartments, means for impart.

in g'a rotary movement to the carrier to bring empty compartments successively into loading position rearwardly of the scraper and to move the loaded compartments away from loading D0- sition, and arcuate plates dispom crosswise ofthe mainframe in front and behind the carrier to form a closure for certain of the loaded compartments so as to retain material loaded into the compartments until ready for discharge.

Y. 4. A machine of .the character described 4comprising a main frame adapted to travel over a treated, a scraper carried by said one oi said arcuate i move the loaded compartments away from loading [iront ofA said-frame, a scraper vempty compa frame, a drumfshaped carrier horizontally disposed in thel irameabove the scraper, a plurality of laterally disposed plates extending longitudinally of the carrier and dividing the carrier into a plurality of compartments, means for imparting a rotary movement to the carrier to bring empty compartments successively into loading position rearwardly ofthe scraper and to move the loaded compartments away from loading position, and arcuate plates disposed crosswise of the main frame in front and behind the carrier to form a closure for'certain of the loaded compartments so as to retain material loaded into the compartments until ready for discharge,

plates being resiliently supported to permit it to move away from the carrier if roots` or other obstructions become interposed between the carrier and said plate.

5. A machine of the character described comprising a main frame adapted to travel over a surface to be treated, a scraper carried by said frame, a drum-shaped 'carrier lhorizontally disposed in the frame above the scraper, a plurality of laterally disposed plates extending longitudinally of the carrier and dividing the carrier into a plurality 'oi compartments, means forl imparting' a rotary ymovement to the carrier to bring empty compartments successively into loading position \rearward1y ofthe scraper and to position, said plates being curved in 4one direc-v tion to form scoop-like outer edges to scoop up material delivered to the carrier by the, scraper,

and a reversely curved scoop-shaped rib on the i vopposite side oi each plate to permit reverse rotation oi the carrier. l' l 1 6. A machine of the character described comprising a main frame, wheels supporting the front of: saidfran'ie, a scraper extending -crosswise oi the main frame and secured thereto, a wheel-supported rear frame, a pairoi' spaced vertically'dis'- posed channel tracks secured to' the rear end of the main frame, rollers mountedI on the rear frame and projecting into the channel tracks, said rollers forming a connection between the main frame and `the rear frame which permits vertical movement oi' the rear end oi the main frame with relation to thfrear frame, and a fluid actuated jack mechanism positioned between the two trames to raise or lower the rear endof the main frame so as to vertically adjust the position ofthe scraper.

-'I. A machine of prising a main frame,

the character described comwheels supporting 'the' extending c of the main frameand secured thereto', a wheel supported rear frame, aV .pair of spaced vertically. disposed channelv tracks secured to the end oi' the main frame, rollers mounted on the rear frame and projecting into the channel tracks, said rollers iorming'a connection between the main irame and the rear'frame'which permits vertical movement of the rear end of `the main frame with relation to the rear frame,' a uid actuated jack mechanism positioned between the two frames to raise or lower the Vrear end of the main frame so as to' vertically adjust the position of the scraper, a multi-compartment carrier sup-4 ported' by the main frame to receive material scraped up parting a rotary movement to said carrier to bring rtnents successively into loading position rearwardly of the scraper and to moveI the loaded compartments away from loading position. 7

by the scraper, and means for im- 7 8. A machine of the character described comprising a main frame, wheels supporting the front of said frame, a scraper extending crosswise of the main frame and secured thereto, a wheel supported -rear frame, a pair of spaced vertically disposed channel tracks secured to the rear end-of the main frame, rollersI mounted on the rear frame and projecting into the channel tracks, said rollers forming a connection between the main frame and the rear lframe which permits vertical movement of the rear end of the main frame with relation to the rear frame, a uid actuated jack mechanism positioned between the two frames to raise or lower the rear` end of the mainframe so as to vertically adjust the position of the scraper, a multi-compartment carrier supported by the main frame to receive material scraped up by the scraper, means for imparting means connected to said frame construction adapted to remove material from said surface; a plurality of material carrying lunits supported by said frame construction; and means supported by said frame for moving said units successively into a position at the rear of said material removing means to receive material gathered by and passing rearwardly from said material removing means, said means being operable to maintain units containing said material in a stationary carrying`.position.

compartments successively into loading position rearwardly of the scraper and to move the loaded 4:ses

compartments away from loading position, and a plurality of arcuate plates secured to the main frame and disposed on opposite sides of the carrier to retain material delivered to the compartments of the carrier until ready for discharge.

9.y In a machine of the character described a main frame, a drum-shaped carrier mounted in the frame, said carrier having a tubular shaft' stub shaft and the tubular shaft, an outwardly extending extension on each stub shaft, and driving means carried thereby.

10. In a machinen of the character described,

the combination of: a frame construction adapted to travel along a surface; material removing means connected to said frame construction adapted to remove material from said surface;

means providing a plurality of compartments supported by said frame construction, and means on said frame for intermittently rotating said compartment means, said means being operable to move said compartments into position at the -rear' of said material removing means, whereby 13. In a machine of the character described, the combination of: a frame construction adapted to travel along a surface; material removing means Y connected to said frame construction adapted to remove material from said surface; a plurality of material carrying units having an opening to receive and discharge material supported by said frame construction; means carried by said frame operable to movesaid units successively into a position to receive material gathered by said material removing means and to subsequently move said units into 'a carrying position; and retaining means arranged exteriorly of said material carrying units supported by said frame and cooperating with said units when said units are in carrying position, to assist in retaining said material therein.

14. In a device of the class described, the combination of: a frame construction adapted to travel along a surface; a plurality of compartments supported by said frame construction, each having a receiving, a carrying, and adumping position; and operating means for said compartments for moving them successively into receiving position in which material is gathered, carrying position in which the gathered material is carried, said compartments being held in receiving 'position and being filled by earth gathered due to aforward movement of the device, and dumping .position in which the gathered material is dumped directly from said compartments said compartment means can be positioned to r e ceive material removed by said material removing means, to carry said material and to dump the same from said machine at the desired location. A

onto the surface over which said device is travelling.

15. In a device of the class described, the combination of: va frame construction adapted to travel along a surface; a plurality of compartments supported by said frame, construction, each having a receiving, acarrying, and a dumping position; means for successively moving said compartments into and from said positions; and spacedgwalls arranged exteriorly of said compartments forming an opening through which material is received into and dumped from said compartments.

11. 1na machine of the character-deairitea the combination of a frame construction adapted to travel along a surface; a blade secured to said frame construction for operation on said surface; and means providing a plurality of compartments supported by said frameconstruction,

and means associated with said frame and com-` partment means for intermittently rotating' said compartment means', said. means being operable to move said compartments into position at the rear of said blade, whereby said compartment 16. In a device of the class described,'the combination of: a frame construction; a plurality of compartments supported by said frame' construction and operatively connected together-so -thateach'compartment successively has a receiving position, a carrying position in which matemeans can be positioned'to receive material re-` moved by said blade andwhich material moves rearwardly over said blade', to carry said material 1 and to dumpthe same from said machine at the desired location. t

rial nay be carried while another compartment isin receiving or dumping position, and adumping position in which material is gathered into the compartment, a carrying position in which the gathered material is carried until dumped from said device at the desired location, and a dumping position; and step-by-step means for moving said compartment into receiving position and from receiving position into carrying position, and for successively movingeach of said compartments from carrying position into dumping position! 17. In. a device of the class described, the com- `bination-of: a frame construction adapted lto travel along a surface; a plurality of connected compartments supported by said frame construction,- each successively having a receiving position, a carrying position in which material may l exteriorly of and in front and in back of said drum cooperating with said drum for assisting in retaining material vin loaded compartments when in certain positions.

cessively into loading position and to move loadedl l units away from loading position into carrying which Amaterial is received A 'from said units. f

'rying position; walls disposed exteriorly of and 19.` In a device of the class described, the combination of: a frame construction adapted to travel along a surface; unit providing means providing a plurality of material carrying units; means'for moving said` units to -bring them sucposition; and walls disposed exteriorly of and in fr ont and in back of said unit providing means, said walls providing opening means through into and discharged 20.v In a device of the class described, the com.- bination of: a frame construction adapted t travel along a surface; unit providing means providing a plurality of material carrying units; means for moving said units to bring'theqm successively into loading position and to move load- I ed units away from Iloading position into carin front and inback of said unit providing means, and providing opening means through which material is received into and discharged from said units; and material removing means secured adjacent said opening `means for operating on said surface.

21. A machine of the character described com'- prising: a main framev adaptedto travel over a surface to be treated; a'scraper 'carried by said frame; a drum-shaped carrier horizontally vdisposed inthe frame above the scraper; a.- plurality of laterally disposed plates extending longitudinallyof the carrier and dividing the carrier into a plurality of compartments; means for iinparting a rotary movement to the carrier to bring empty compartments. successively into loading' position rearwardly of the scraperand to move the loaded compartments .away from loading position, said plates being curved in onel direction to form'scoop-like'outer edges to scoop up material delivered to the carrier by the scraper;

and a material engaging means on the opposite side of each'plateto Vpermit reverse rotation of the carrier. 'j

22. In an... earth scraper, the combination of: a frame construction adapted to travel-along a surface, and having a scraper blade; a bowl positioned to the rear of said scraper blade; pivotally supported loading and dumping means including a pair of generally radially extended walls spaced from'each other and movable into the bowl, one of which walls moves into said bowl ahead of the earth, and the other of which follows the earth during loading, said loading and dumping means having a stationary carrying position; and operating means for holding said loading and dumping means in said carrying position 'and for moving said loading and dumping means in either direction. .I

23. In an earth scraper, the combination of: a frame construction adapted to travel along a surface, and having a scraperl blade, a substantially semi-cylindrical bowl positioned to the rear of said scraper blade; a rotatable.` loading and dumping means including a pair of walls spaced from each other and receivable in said bowl,

one of which walls moves into said bowl ahead of the earth, and the other of -which follows the, earth during loading, said loading and dumping means having a stationary carrying position; and operating means for holding saidloading and dumping means in saidcarrying position and for rotating said loading and dumping means in either direction.

24. In a device of the class described, the combination of: a frame construction adapted to travel along a surface; a blade supported by said frame construction; a plurality of compartments supported by said frame construction, each hav-I ing a receiving position adjacent said blade, a

carrying position, and -a dumping position; and

means Ifor holding said compartments in their different positions and for moving them from one position to another.

, WESLEY lK. McMILLAN.-

g CERTIFICATE oF CORRECTION. c patent No. 2,169,612. v August. 15, 1959. WESLEY E'. nenILLAN.

It is hereby certified that error appears in the printed specification yof fthe'above numbered patent requiring correction a's follows; Page 5, sec.- ond column, line 56, beginning with "16. In a device" strike out all to I and including the word and period lanother in line 9, first.. co1umn page 6, 'comprising claims 16 and l?, and insert instead the following 16. Ina'device ofthe class described, the .combination of:

' a frame construction; a plurality of compartments carried by said frame construction and each having a receiving position in which material is gathered into the compartment, a carrying' position in which the gathered material is carriedunti] dumped from Asaid device. at the desired 1ocation,and a dumping position; and step-by-step means for moving said compartment into receiving position and from receiving position into carrying position, and for successively moving each of said compartments-from carrying position into dumping position.-

17: Inadevice of the class described, lthe combination of: a frame construction adapted to ltravel along a surface; j a plurality of compartments supported by said frame. construction and operatively, connected together so jthat each compartment successively has a receiving position, a carrying position'in which material may be carried while Vanother compartment is in l receiving -or.dumping position, a dumping position; and means for holding said compartments in their different positions and-formoving them from one position to another.; Y

and that the said Letters paltnt shouldbe readwith this correction thereinv that the "same may conform to the record of 'thecase inthe PatentjOffi-c'e@ signed and sealed this rdvday of october, A. D. 1959.

v v Henry VanAArsdale, (Seal) Acting Conmissioner of Patents.

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