US2697292A - Digging adjustment for roll-over scrapers - Google Patents

Description

1954 J. s. RODGERS DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS 6 Sheets-Sheet 1 Filed Dec. 10, 1948 JWMES -5. P606571 5,

1954 J. s. RODGERS I DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS Filed bee.

6 Sheets-Sheet 2 Dec. 21, 1954 J. s. RODGERS 2,697,292

DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS Filed Dec. 10, 1948 6 Sheets-Sheet 3 game/Mm JFME'S 5 FODGfFS,

Dec. 21, 1954 J, 5. RODGERS DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS Filed Dec. 10, 1948 6 Sheets-Sheet 4 JWES SJFOQGEAZS,

1954 J. s. RODGERS DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS 6 Sheets-Sheet 5 Filed Dec. 10, 1948 Dec. 21, 1954 J. 5. RODGERS DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS 6 Sheets-Sheet 6 Filed Dec. 10, 1948 qJ/FMEIS 6 500651525 United States Patent DIGGING ADJUSTMENT FOR ROLL-OVER SCRAPERS James S. Rodgers, Texarkana, Tern, assignor to Terrence Rich Research, an assumed name of a company of Bowie County, Tex., owned by Helen C. lngham Rodgers Application December 10, 1948, Serial N 0. 64,541

9 Claims. (Cl. 37-440) This invention relates to improvements in scrapers such soil without the breakdowns and failures usually encountcred with devices of this kind.

It is a further object of the invention to provide a scraper having a dirt collecting bucket adapted to ride on the ground and a dirt pick-up apron mounted separately from said bucket and releasably held thereagainst during the dirt digging and transporting operations and releasable for movement away from said bucket during the dumping operation.

It is a still further object of the invention to provide a scraper having a plurality of interconnected frame members mounted for longitudinal and tilting movement with respect to each other to facilitate movement of the scraping mechanism into and out of digging position.

It is a further object of the invention to provide a scraper having a frame member, a dirt pick-up apron mounted on the frame member and releasably held in fixed position thereon, means for moving the frame memher to tilt the dirt pick-up apron to different operative positions, and means to release the dirt pick-up apron to permit it to move from its fixed position to a different position.

Another object of the invention is to provide frame members for a scraper which are mounted for relative longitudinal and tilting movement and which may be releasably locked in fixed position to prevent such relative longitudinal and tilting movement during certain phases of operation of the device.

It is a further object of the invention to provide a locking device for a pivoted member whereby the pivoted member may be releasably held in fixed position.

These and other like objects and advantages of the invention will be apparent to persons skilled in the art to which the invention relates from a consideration of the accompanying drawings and annexed specification illustrating and describing a preferred embodiment of the invention.

In the drawings: I

Fig. l is a view in side elevation of the improved scraper device of the present invention showing the parts in operative position for digging dirt;

Fig. 2 is a view in side elevation similar to Fig. 1 but showing the parts in position after the dirt pick-up apron has been removed from the dirt;

Fig. 3 is a side elevation view similar to Fig. l but showing the parts in position for transporting a load of dirt to the dumping area or for moving the device from one location to another;

Fig. 4 is a side elevation view similar to Fig. 1 but showing the parts in position for dumping a load of dirt;

Fig. 5 is a top plan view of the device;

Fig. 6 is an enlarged fragmentary view of the device in side elevation with portions of the frame and bucket broken away;

Fig. 7 is an enlarged plan view of a portion of the device showing the releasable locking means for the bucket;

Fig. 8 is an enlarged sectional view of a portion of the device taken on line 88 of Fig. 5;

Fig. 9 is a sectional view of a portion of the device taken on line 99 of Fig. 8 but omitting the bell crank;

Fig. 10 is an exploded perspective view of a portion of the device shown in Figs. 8 and 9;

Fig. 11 is a sectional view of a portion of the bucket taken on a vertical plane through the shoe;

Fig. 12 is a sectional view of the shoe and a portion of the bucket taken on line 12-12 of Fig. 11;

Fig. 13 is a sectional view of the shoe and a portion of the bucket takenon line 13-13 of Fig. 11; and,

Fig. 14 is a sectional view of the shoe and a portion of the bucket taken on line 1414 of Fig. 11.

Referring now to the drawings wherein like reference characters designate the same parts throughout the several views the numeral 1 denotes a frame member having side frame portions 2 and 3 which converge inwardly at their forward ends but are spaced apart sufficiently at their rear ends to receive the bucket 4 therebetween. The bucket 4 is mounted on trunnions 5 journalled in bearings attached to the side frame portions 2 and 3 and is adapted to support the frame 1 and associated mechanism during the operations of digging, transporting and dumping dirt. The bucket 4 has a curved bottom portion provided with runners or shoes 7 to take the wear occasioned by sliding contact of the bucket with the ground.

The specific construction of the shoes 7 is shown in Figs. ll to 14 and comprises U-shaped channel members formed of a tough Wear-resistant material such as heattreated manganese steel. The channel members 8 are attached to the bottom of the bucket by any suitable means such as the clamping member 9 and the bolts and nuts 1%) and 11. A strengthening member 12 is secured to the bottom of the bucket between the ends of the shoes to add rigidity and strength to the construction. As the shoes wear in the course of use they may be replaced with new ones with a minimum expenditure of time and effort merely by removing the bolts 16, withdrawing the shoe from its clamping member 9 and inserting a new one in its place.

The shape and location of the shoes 7 and the bottom of the bucket are of considerable importance in connection with dumping of the bucket 4. Tests have shown that a fiat bottom bucket will not roll over and dump unless the forward edge strikes an obstruction such as a mound of dirt or a stone or runs off a slight drop off. For this reason the shoes 7, one on each side of the bucket 4, are positioned so that the central portion thereof lies somewhat to the rear of the vertical center line of the bucket. in addition the shoes are curved with substantially the same curvature as the bottom of the bucket. Thus when the bucket is released for dumping the front edge thereof will drop down and start the rolling motion which will be continued by virtue of the curved configuration of the runners 7 and the bottom of the bucket.

The bucket 4 is held in fixed position relative to the frame 1 by means of notches 13 in the side walls of the bucket and cooperating pins 14 mounted on arms 15 pivoted at 16 to the side frame portions 2 and 3. Pins 14 are moved out of their locking position in the notches 13 by means of a lever actuated mechanism comprising a shaft 18 mounted on the frame members 2 and 3, lever 17 and arm 19 keyed to the shaft 18, and links 20 connecting the lever 17 and arm 19 to the arms 15. A spring connecting the lever 17 to frame portion 3 (hidden from view in the drawings) yieldingly tensions the lever 17 rearwardly and such spring causes the lever 17 to act through the mechanism described to urge the pins 14 into locking engagement with the notches 13. Additional notches 22 spaced from the notches 13 cooperate with the pins 14 to hold the bucket in dumping position as will be more apparent hereinafter.

A dirt pick-up apron 25 is pivotally mounted on brackets 26 secured to a cross member attached to the side frame portions 2 and 3 and is held in operative position adjacent the bucket 4 by catch members 27 pivotally mounted on the side frame portions 2 and 3 as shown more particularly in Fig. 6. It will be noted that the sides and bottom of the dirt pick-up apron constitute prolongations of the sides and bottom of the bucket and that the bottom of the dirt pick-up apron is inclined downwardly from the bottom of the bucket to facilitate entry of the apron into the dirt and movement of the dirt into the bucket during the digging operation. Release of the dirt pick-up apron to permit dumping of the bucket is effected by projecting lugs 23 mounted on the links 26. Thus when the links 23 are actuated by the lever 17 and arm 19 to move the pins 14 out of engagement with'the notches 13, the lugs 2-3 strike the upper ends of the pivoted catch mem bers 27 and swing them to release the dirt pick-up apron 25 and permit pivotal movement thereof downwardly and forwardly away from the dirt collecting bucket 4 to the position shown in Fig. 4. Movement of the apron 25 away from the bucket 4 in the manner described permits rotation of the bucket 4 to dumping position when the locking means therefor is released as hereinbefore described.

From the above description it will be apparent that the bucket and dirt pick-up apron are releasably held in fixed relative positions with respect to each other and to the frame 1 and that upward and downward tilting movement of the frame 3. moves the dirt pick-up apron 25 and bucket 4 into their various operating positions. Such tilting movement of the frame 1 is accomplished by a novel rangement of elements which will now be described.

As shown more particularly in Figs. l4, 6 and 8 a separate draft frame member 33, which is curved downwardly adjacent its mid-portion and then upwardly and rearwardly from adjacent its mid-portion to its end portion, extends rearwardly and upwardly between the forward converging portions of the side frame members 2 and 3 and is supported on hearing means comprising a roller 31 mounted on a transverse support attached to the said frame members. A yoke 29 retains the frame member 36 in position on the roller 31. The side frame members 2 and 3 are connected to the frame member 30 by a pivoted yoke connection comprising bearing means comprising a roller 33 mounted between the forward ends of the frame members 2 and 3 and riding in a slot 3- of a pivoted arm in the form of a yoke 35. Yoke 35 is pivotally connected at its lower end to the frame member 3% and may assume a forwardly inclined position as shown in Fig. l or a rearwardly inclined position as shown in Fig. 2.

The roller 33 is urged to an upper or lower position in the slot 34 by a push or pull on the frame member 36 and by the forward or rearward inclination of the yoke 35 and is releasably locked in its upper position in the slot 34 by a bell crank lever 36. The bell crank lever 36 is pivotally mounted on the yoke 35 and has a portion 37 extending into the slot 34 and a portion 33 extending at right angles thereto. Bell crank lever 36 is urged into locking position by a spring 33 connected at one end to the portion 38 and at the other end to the yoke 35 and may be released from locking position by manual means described hereinafter.

From the description thus far it will be apparent that the pivoted and slotted yoke connection between the frame members 1 and 30 and the upwardly and rearwardly curved portion of frame member 30 riding on the roller 31 permit relative longitudinal and tilting movement of the frame members l and 30 during various phases of the operation. This relative movement of the parts described will tilt the frame member l and the associated dirt pickup apron 23 and bucket 4 and cause them to assume the various operative positions shown in Figs. 1-4.

The rearward pivoting movement of yoke 35 is limited by a stop 46 mounted on the frame member 30. Thus in its rearwardly inclined position the yoke 35 rests against the stop 46 and is held there by a forward pull on the frame member 30 exerted by a tractor or other draft device.

The yoke 35 is releasably locked in its forwardly inclinedposition during certain phases of the operation by a locking mechanism shown more particularly in Figs. 6, 7 and 8 and comprising a linkage mechanism 42 and a locking member 43. The linkage mechanism 42 comprises links l and 45 pivotally connected together at one end and having their opposite ends connected to the yoke 35 and frame member 3'!) respectively.

One end of the link 44- has an extension 46 which in the forwardly inclined position of the yoke 35 is located beneath a crosspiece 47 on the locking member 43. As shown 111 Fig. 16 the crosspiece 47 is secured to links 43 and has pro ections 49 for a purpose which will be apparent hereinafter. The links 48 are pivoted at their lower ends on a pm '0 secured in the frame member 36 (Figs. 8 and 9) A roller 51 is mounted between the upper ends gfvthe links 48 and serves to facilitate relocking of the e ice.

From the description thus far it will be apparent that movement of the yoke 35 and linkage 42 clockwise from the position shown in Fig. 8 is prevented by the crosspiece 47 of locking member 43. Hence, as long as the locking member 43 remains in the position shown in Pig. 8, the yoke 35 will be locked in its forwardly inclined position. When it is desired to release the yoke 35 from its iocked position the locking member 43 is swung countercloclo wise until the crosspiece 4'7 clears the end of the extension 46 of the link 44. This is accomplished by a lever 6i. (Fig. 8) acting through a pair of arms 6 pivoted on the pin 56 outside of the links 43. As will be apparent fror Fig. 6 the projections 49 contact the arms 61 and are held thereagainst through links 43 by a spring 62. Such spring 62 tensions links by connection at its forward end to a hook 48' (Figs. 6 and 8) on one of links 48 and at its rear end to frame member 3%). Thus, when the arms 61 are swung in a counterclockwise direction by manual operation of the lever 66, the locking member 43 is likewise swung in a counterclockwise direction by virtue of the arms 61 contacting the projections 49. This releases the yoke 35 as pointed out hereinbefore and frees it for movement in a clockwise direction.

The lever 6% is pivotally connected to the upper ends of the arms 61 and is so mounted that when swung in a clockwise direction it merely pivots on the arms 61 without moving them and when swung in a counterclockwise direction it carries the arms 61 with it. Thus, the lever 6 is made to perform two functions, i. e., (l) to release the roller 33 by swinging the bell crank 36 when moved in a clockwise direction and (2) to release the yoke 35 by swinging the arms 61 and locking member 4-3 when moved in a counterclockwise direction. The former function (1) is accomplished by providing the lever 66 with extensions 63 having a pin 64 mounted in the ends thereof. These are arranged so that when the lever 69 is moved in a clockwise direction the pin 64 contacts the arm 33 of the bell crank 36 and depresses it to move the arm 37 of the bell crank out of the slot 34. The latter function (2) is accomplished by providing the lever 66; with downwardly projecting arms 65 having a cross member 66 thereon adapted to abut a cross member 67 on the arms 61 (Figs. 8 and 10). Thus as the lever 60 is moved in a counterclockwise direction it is prevented from pivoting on the arms 61 by the cross member 66 abutting the cross member 67 and hence the arms 61 are likewise moved in a counterclockwise direction.

The members 66 and 67 areurged into abutting relationship and also in a clockwise direction by the spring 69. Their movement in a clockwise direction is limited by a bolt 70 having nuts '71 and 72 thereon for securing the members 66 and 67 to a member '73 attached to the frame member 36. The bolt 76 passes through openings 74 and 75 of cross members 66 and 67, the openings preferably being elongated or enlarged to facilitate clockwise movement of the lever 60 independently of the arms 61.

From the above description it will be apparent that the particular interconnection between the lever 69 and the arms 61 permits these members to move as a unit in a counterclockwise direction against the action of the spring 69, and the lever 66 to be individually pivoted in a clockwise direction against the action of the spring 69 to cause the pin 64 to rotate the bell crank lever 36 and release the roller 33.

In the operation of the improved scraper device of the present invention the frame member 30 is connected to an arm 73 of a tractor or other prime mover by a yoke 7'9 and pin 84). To start the machine digging dirt from the dirt carrying or transporting position of Fig. 3 the lever 60 is pushed to the rear in a clockwise direction to swing the bell crank 36 and release the roller 33. The forward pull of the tractor then forces the roller 33 to the lower end of the slot 34 so that the frame i and dirt pick-up apron 25 are tilted downwardly and forwardly to their greatest extent as shown in Fig. 1. In this position the entire weight of the machine rides on the cutting or entering edge of the dirt pick-up apron 25 and since a substantial portion of this weight is located to the rear of the cutting edge it exerts a leverage action thereon which makes the total force acting on the cutting edge somewhat greater than the total weight of the machine. Under the influence of this force, the downward inclination of the cutting edge of the dirt pick-up apron and the forward pull of the tractor, the dirt pick-up apron quickly digs into the dirt to start the digging operation.

When the machine has dug itself in deep enough and enough dirt has entered the bucket the lever 60 is swung forward in a counterclockwise direction and carries the arms 61 and locking member 43 with it to unlock the yoke 35 and release the machine from digging position. It is an important feature of the present invention that the yoke 35 and associated locking mechanism are so constructed and arranged that the machine may be readily unlocked from its digging position even under the heaviest pull of the tractor. Thus when the yoke 35 is locked in its forwardly inclined position, the pivotal connections of yoke 35 and link 45 with the frame member 30 and the pivotal connection between links 44 and 45 are in substantial alignment (see Fig. 6) while the pivotal connection between link 44 and yoke 35 is offset somewhat from this alignment. By virtue of this construction the greater part of the pull exerted by yoke 35 (which is the entire pull of the tractor) trying to rotate on its pivot falls on the pivotal connection between link 45 and frame member 30 while the smaller part of the pull exerted by yoke 35 through link 44 tending to rotate the link 45 from its locked position is resisted by the locking member 43. This affords freedom of movement of the parts without the possibility of their getting on dead center while still keeping the pressure on the lock 43 at a practical amount to permit very easy operation of the lever 60 at all times. Although such construction is preferred for maximum effectiveness and ease of operation, variations thereof may be made employing the same principles of operation without departing from the scope of the invention.

When the yoke 35 is unlocked as aforesaid the forward pull of the tractor causes it to swing rearwardly in a clockwise direction until it strikes and comes to rest against the stop 40. Movement of the yoke 35 rearwardly frees the frame member 30 for limited movement forward, but forward movement of the frame member 1 is resisted by the load of dirt in the bucket 4 and the dug-in position of the dirt pick-up apron 25. Under these conditions the roller 33 will be forced upwardly in the slot 34 until it engages and is locked by the bell crank 36. This causes the dirt pick-up apron 25 to angle upwardly out of the dirt to the position shown in Fig. 2.

This construction and mode of operation affords a very effective and powerful means for extricating the scraper from hard and/or packed dirt. It is particularly effective where the tractor or other draft device becomes stalled under the heavy load, for it permits the tractor to be backed and then moved forward a short distance to gain appreciable momentum before the full force of the load is thrown thereon. It will be understood in this connection that draft frame member 30 is capable of rearward movement relative to frame 1 from the position shown in Fig. 1 to that shown in Fig. 3 and subsequent independent forward movement to the position shown in Fig. 2, such movement being provided for by yoke 35. The momentum plus the pull of the tractor as the load is taken up is usually sufficient to extricate the device from the most difficult types of soil.

Although the machine may be taken to the unloading or dumping location when the parts are in the position shown in Fig. 2, it is preferable to back the tractor slightly to return the yoke 35 to its starting position as shown in Fig. 3, which makes it ready for the next digging operation and also lifts the edge of the dirt pick-up apron 25 to a point several inches above the ground so it will pass over any obstructions encountered in carrying the load of dirt.

Backing of the tractor causes the frame member 30 to move rearwardly and upwardly on the roller 31, and the yoke 35 to pivot to its forwardly inclined position carrying with it the roller 33 locked in its uppermost position in the slot 34 by portion 37 of the bell crank lever 36. As the yoke 35 moves into its forwardly inclined position extension 46 of the link 44 strikes the roller 51 on the locking member 43 causing the locking member 43 to pivot counterclockwise against the action of the spring 62 independently of the arms 61 and lever 60. As the yoke 35 reaches the limit of its forwardly inclined position the roller 51 rides upwardly over the extension 46 of the link 44 and the locking member 43 is then snapped into locking position by the spring 62. With the parts in this position the device is then pulled to any desired location to dump the dirt. Thus it is possible for link 44 to become locked by the locking member 43 without moving the arms 61 and lever 60 from their normal post tions.

When the dumping area is reached the lever 17 is rotated counterclockwise by a rope or other suitable connection to remove the pins 14 from the notches 13 and simultaneously disengage the catch 27 from the dirt pickup apron 25. This permits the dirt pick-up apron to hang freely downwardly away from the bucket 4 and the bucket 4 to be rotated by the forward pull of the tractor.

In this connection the curved bottom of the bucket 4 and the corresponding curve of the shoes 7 facilitate rotation of the bucket so that as soon as the pins 14 are disengaged from the notches 13 the bucket drops forwardly to begin its rotation and forward movement of the machine continues the rotation.

If it is desired to dump the dirt in one pile the bucket 4 is permitted to rotate throughout a complete revolution by maintaining the lever 17 in its clockwise position until the notches 22 have passed the pins 14. The lever 17 is then released to permit the pins 14 to again engage the notches 13 when the bucket has completed a full revolution. During this movement the dirt passes out of the ofien portion of the bucket and is deposited in a single p e.

If it is desired to spread the dirt as it is dumped the lever 17 is released as soon as the notches 13 clear the pins 14. This permits the pins 14 to engage the notches 22 and thereby stop the bucket in the position shown in Fig. 4. As will be apparent the forward movement of the machine will cause the front edge portion of the bucket bottom to spread or level the dirt as it is discharged from the bucket. When the bucket is empty the lever 17 is again moved counterclockwise to withdraw pins 14 from notches 22 and thus permit the bucket to continue its rotation until pins 14 again engage notches 13. The tractor then continues on to the digging area with the parts in the position shown in Fig. 3 except that the dirt pick-up apron is still hanging downwardly in the position shown in Fig. 4. Thus dumping of the dirt from bucket 4 is accomplished without stopping the machine merely by manipulating the lever 17.

When the digging area is reached the lever 60 is moved clockwise to pivot the bell crank lever 36 and thus release theroller 33 for movement to its lowermost position in the slot 34. This brings the dirt pickup apron 25 into contact with the ground which thereby rotates it into the latched position shown in Fig. 1 and again puts the parts in position for digging or scraping dirt as shown in Fig. 1. If desired the dirt pick-up apron may be manually rotated to latched position at any time following the dumping operation and preceding the scraping operation. This may be accomplished from the operators seat by a rope or wire attached to the dirt pick-up apron and passing over suitable pulleys or equivalent means to a position adjacent the operator.

It will thus be seen that the improved scraping machine of the present invention provides a very rugged and a very effective device for scraping and/or digging both loosely packed and hard packed dirt. It is particularly effective in connection with the latter use as compared to prior art devices of this type and may be readily forlced into and extricated from the most difficult types of S01.

Various modifications of the invention described and illustrated will most likely occur to those skilled in the art to which the invention relates and may be made without departing from the spirit of the invention, the scope of which is indicated in the attached claims.

I claim:

1. A scraper comprising a first frame member, a dirt collecting bucket mounted on said frame member and releasably held in fixed position with respect thereto, a dirt pick-up apron mounted on said frame member adjacent to but separately from said bucket and means for releasably holding the dirt pick-up apron in fixed position with respect to the dirt collecting bucket, a second frame member, means interconnecting said first and second frame members for relative longitudinal and tilting movement to tilt the bucket and dirt pick-up apron to different operative positions, said means comprising a yoke member pivotally connected at one end thereof to said second frame member and having a slidable connection with said first frame member, said yoke member being movable between forwardly and rearwardly inclined operative positions, and further releasable means cooperating with said yoke member for releasably holding the frame members in a selected operating position and being operable to release said frame members.

2. A scraper comprising a first frame member, a dirt collecting bucket mounted on said frame member and releasably held in fixed position with respect thereto, a dirt pick-up apron mounted on said frame member adjacent to but separately from said bucket and releasably held in fixed position with respect thereto, a second frame member, means connecting said first and second frame members for relative longitudinal and tilting movement comprising a yoke member pivoted to said second frame member and having a sliding connection with said first frame member, and means for locking said yoke member in fixed position to hold the frame members in a selected operating position.

3. A scraper comprising a frame member, a dirt collecting bucket pivotally mounted on said frame member, a dirt pick-up apron pivotally mounted on said frame member independently of the bucket, means for releasably locking the dirt collecting bucket and dirt pick-up apron in fixed positions with respect to the frame member, means to release the dirt collecting bucket for rota tion to dumping position in response to a force applied thereto, and means associated with said bucket releasing means adapted to release the dirt pick-up apron simultaneously with release of the bucket to permit the dirt pick-up apron to move away from the bucket and hang freely from its pivot.

4. A scraper comprising a frame, dirt scraping means mounted on said frame, supporting means mounted on said frame, a frame member supported by said supporting means for longitudinal movement relative to said frame, an arm pivoted on said frame member forwardly of said supporting means and adapted to be pivoted to different operating positions in response to a force applied to said frame member, and means slidably connecting said frame to said arm for movement to different positions thereon in the different operating positions of said arm, the pivoting of said arm to different operating positions and the movement of said frame therealong effecting relative movement of said frame member and supporting means to cause said frame to be tilted to different operating positions.

5. A scraper comprising a frame member adapted to be connected to a draft device, an arm pivoted on said frame member intermediate the ends thereof and pivoted to different operating positions in response to a force applied to said frame member, a frame slidably connected to said arm for movement backward and forward therealong in the different operating positions of F said arm, said frame extending rearwardly of said frame member and provided with dirt pick up and collecting means, and means on said frame supporting said frame member rearwardly of said arm and adapted to permit relative longitudinal movement of said frame and frame 3 member when said arm is moved to different operating positions and said frame is moved therealong, said movements of the parts effecting a tilting of the frame to various operating positions.

6. A scraper as set forth in claim 5 in which the portion of said frame member which engages said supporting means is curved upwardly and rearwardly.

7. A scraper as set forth in claim 5 including means for releasably holding said arm in a selected operating position.

8. A scraper comprising a longitudinally extending draft frame member, a frame, a dirt collecting bucket pivotally mounted by the frame for turning movement about an axis extending transversely of the frame, bearing means on the frame supporting the draft frame member for longitudinal movement relative to the frame, a lever arm pivoted on the draft frame member for swinging movement longitudinally thereof between forward and rear inclined positions, and further bearing means located forwardly of said first bearing means, said further bearing means supporting the frame for sliding movement lengthwise of the lever arm, retaining means for releasably holding said lever arm in its forward inclined position, said lever arm, upon forward motion of the draft frame member and release of said retaining means, being adapted to be swung to its rear position by the frame and effect rearward longitudinal movement and upward tilting movement of the frame relative to the draft frame member and sliding movement of the frame relative to the lever arm, said lever arm, upon subsequent rearward motion of the draft frame member, being adapted to be swung to its forward position by the frame and effect rearward movement of the draft frame member relative to the frame.

9. In a scraper, a frame member, an arm pivoted on said frame member and adapted to be pivoted to different operative positions, and means for locking the arm in a selected position comprising a pair of connected link members interconnecting said arm and frame member and adapted to be moved with respect to the frame as the arm is pivoted, and means associated with the frame member for engaging one of said link members for releasably locking the link members and said arm in fixed positions, said last said means comprising a yoke member pivoted to the frame member and having a portion thereof adapted to engage the link members to hold them in fixed position.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 694,560 Livengood Mar. 4, 1902 1,488,059 Pritchard Mar. 25, 1924 1,616,212 Bird Feb. 1, 1927 1,692,018 Anderson Nov. 20, 1928 2,158,340 Spieth May 16, 1939 2,301,604 Zahara Nov. 10, 1942 2,348,117 Elliott May 2, 1944 2,393,345 Sladecek Jan. 22, 1946 2,411,688 Keim et a1. Nov. 26, 1946 2,445,260 Brimhall July 13, 1948 2,473,786 Collins June 21, 1949 2,514,091 Reynaud July 4, 1950 2,514,810 Spieth July 11, 1950 2,534,972 Hume Dec. 19, 1950 2,648,921 Brown Aug. 18, 1953

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