US2103116A

US2103116A - Dam forming device for listers

Info

Publication number: US2103116A
Application number: US73101A
Authority: US
Inventors: Charles T Peacock
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-04-07
Filing date: 1936-04-07
Publication date: 1937-12-21
Anticipated expiration: 1954-12-21

Description

Dec. 21, 1931 c. T. P ACQCK 2,103,116

DAM FORMING DEVICE FOR LISTERS.

INVENTOR.

CHAR]. '5 z PE/moc/r 33 ATTORNEY. 'I

Dec. 21, 1937. c, PEACQCK 2,103,116

DAM FORMING DEVICE FOR LISTERS Filed April 7; 1936 2 Sheets-Sheet 2 INVENTOR. (HA/FL 3 r PEA co CK ATTORNEY.

45 along line 3-3 Figure 1;

Patented Dec. 21, 1937 Russo DEG 241940 UNITED STATES P'ATE'NT OFFICE 57 Claims.

This invention relates to improvements in dam -forming devices for listers and is an improve- --rnent on the invention shown, described and claimed in U. S. Letters Patent 1,892,002 granted 5 to me December 27, 1932.

It is an object of this invention to produce a damming device, of the type identified, which shall be especially adapted for contour farming in places where the land is rolling and which lomakes it unnecessary to run level lines to determine the path of the lister.

Another object is to produce a damming device that can be attached to listers of ordinaryconstruction without making it necessary to 15 change the lister in any way.

A further object relates to the provision whereby the damming scrapers can swing laterally relative to the Iister so that the scraper blades may follow in the furrows formed by the lister 20 when going around curves.

A further object is to produce a damming device of such construction that the dam. forming scrapers can operate independently of each other.

A'still further object is to produce a damming device in which the distance between the dams can be easily altered so as to adjust the machine for the terrane where it is operating.

Another object of this invention is to produce a damming scraper of such construction that it will prevent clogging and readily cl'ear itself at each dam.

The above and any otherobjects that may appear as the description proceeds, are attained by means of a construction and an arrangement of 35 parts that will now be described in detail and for this purpose reference will .be had to the accompanylng drawings in which the device has been illustrated and in which,

Figure 1 is a top plan view showing portions of an ordinary lister and my improved damming device attached thereto;

Figure 2 is an end elevation of the assembly shown in Figure 1;

Figure 3 is a fragmentary side elevation taken Figure 4 is a section taken on a line corresponding to line 4-4 Figure 3, and in icated by line 4-4 Figure 1;

Figure 5 is a section taken on line 5--5 Fig- 50 ure 3;

Figure 6 is a section taken on line 6-6, Figure 3;

Figure '7 is a view of the upper portion of the damming shovel detent or pawl, taken on line to 'l-'I Figure 3;

Figure dis a section taken on line 88 Figure 1, and shows the detent releasing cam;

Figure 9 is, a section taken on line 9-9 Figure 8;

Figure 10 is a section taken on line Ill-I Figure 1;

Figure 11 is a view looking in the direction of arrow ii in Figure Figure 12 is a view, partly in section, taken on line l2-i2 Figure 1;

Figure 13 is a view looking in the direction of arrow 13 Figure 12;

Figure 14 is a view taken on line M-M Figure 1, showing the damming scraper assembly, and 15 Figure 15 is a view looking in the direction of arrow i5 Figure 14.

In the drawings the lister to which thedamming device is attached is represented by a few parts only as the invention to which this application relates is an attachment. The lister is represented in part by the three beams or shanks numbered 5, which are spaced inches apart instead of the usual distance of 40 inches. Each beam is provided with a long narrow chisel 6 which varies in size from six by sixteen inches for ordinary and four by sixteen inches for deep tilling. The shanks are provided with brackets 71 whose rear ends turn outwardly as indicated by numeral 8 and to the out turned ends a flat steel bar ii is secured by bolts or rivets it. (See Fig. 11.) The shanks carry the ordinary axle ii to which the wheels 12 are attached. One wheel carries a sprocket 13 by means of which power is transmitted by a suitable sprocket chain shown dotted. The parts just described designate the lister. Three shanks only have been shown, but any suitable number from one to six or more can be used.

The attachment comprises a number of angular steel brackets M, shown most clearly in Figures 10 and 11. One bracket is positioned directly back of each shank 5, except at the ends where they are positioned at the ends of the bar '9. The brackets are secured in place by bolts I5 and carry bearings l6 removably secured thereto by bolts i'i. At the rear of each shank a vertically extending bar 18 is positioned and connected with the shank by means of. a brace l9. A shaft 20 is journaled in bearings i6 and is held 50 from moving longitudinally by two or more collars 2i.

Shaft'ZU carries a sprocket wheel 22 that 1: connected with the sprocket wheel 13 by means of suitable sprocket chains and idlers, indicated by dotted lines. Rotatably connected with shaft fill are a number of bearings 23 (see Figures 12 and 13): there is one more bearing 23 than shanks. These bearings are held from longitudinal movement by means of collars 24. Each bearing 23 has, in addition to the opening for the shaft 2d, a hole for the reception of the bolt 25. Embracing each hearing block 23 is a forked. connector having spaced parallel arms 26, between which the bearing block is positioned and to which it is attached by the bolt 25. Each conhector has a shank 2?! to which a pipe 28 .is attached by bolts or rivets 2d. The other ends of pipes 28 are provided with similar bearings which carry the shaft at which however, does not, as a rule, rotate in the bearing blocks.

Collars 2A are preferably secured to the ends of shaft 30 to prevent the and bearings from moving outwardly. Mounted for rotation on shaft 3t, between each pair of bearing blocks is a three bladed damming scraper, the blades of which have been designated by numeral til. The construction of the damming scraper is shown with considerable particularity in Figures i l and 15 from which it will be seen that it consists of two hubs 32, each having three radial arms 33, spaced degrees apart. The blades are formed from a curved steel bar at whose ends are riveted or bolted to the arms 33. A number of fiat bars or prongs 35 are secured at their outer ends to the curved bar 3 3 being preferably welded thereto.

A piece of shelby tubing it extends through the hubs 32 and is held in position by set screws 37. The tubes 36 serve as bearings and extend between adjacent bearings in. the manner shown in Figure 15. Attention is called at this point to the fact that the frame comprising the shafts 2d and 30 and the hollow bars 28 can be moved about bolts 25 as pivots, to form equilateral rectangular parallelograms and to either side of the center so as to form rhomboids; this movement being indicated by arrows 38 in Figure 1. The lateral movement just referred to makes it possible to operate the lister and damming device on curved paths so as to follow contour lines on hilly'or rolling terrane.

in the construction shown in my prior patent,

above identified, the frame of the damnung device is rigid and the machine must therefore be operated in straight or nearly straight paths.

The weight or the frame of the damming attachment is partly supported by means of tension members 39 and springs til; the former being attached to the tubular bars 28 and the latter to the upright l8 supported on the bar 9 of the frame, as shown in Figures 1 and 2. The supporting springs thus extend diagonally upwardly and diagonally laterally so that they not only act to partially support the weight of the damming device but also bias the latter toward a position in longitudinal alignment with the frame, with the scraper blades 3| directly behind the lister bottoms 6.

The rotation of the scraper blade is controlled by an escapement mechanismwhich will now be described. U-shaped .detentjmembers, each comprising a fiat bar having sides 4| connected by a straight portion 42, have their sides pivoted to adjacent bars 28 by means shown in Figures 6 and '7. A bolt 43 extends diametrically through .the tubular number 28 and is provided with one or more bushings 44 which are positioned in openings in the sides 4|. By the construction ,-described the bolts can be tightened without clamping the detents or interfering with their free movement.

One end Ma of each detent projects downwardly below the tubular bars 28 and is secured to the latter by means of a spring 45 (Figure 3). Attached to each detent is a bar 46 of spring steel, as shown in Figure 7; the purpose of this is to cushion the shock caused by stopping the rotation of the scraper blade assembly.

The counter-clockwise (Figure 3) rotation of l the detent is limited by a stop which will now be described. Secured to each tubular bar 28 is a U-shaped member (see Figure 4) having round side members 4? connected at their centers by a fiat portion d8 which is curved about bar and secured to it by a bolt or rivet t9. Each side arm 5'! carries a cylindrical resilient member formed from rubber or rubberized fabric properly vulcanized. The .stops are angularly inclined and so positioned that they lie in the paths of sides ti and parallel with them when the parts are in operative position, shown in Figures 2 and 3. The outer ends of bolts d? are connected by a bar 56, held in place by nuts 52, and a brace is connected with the bar at and with a bolt The detent is so positioned that when it is in the operative position, shown in Figures 1, 2, 3, the bar it will be engaged by the scraper blade and will hold said scraper from turning about shaft 30.

It has previously been pointed out that shaft I 20 is rotated from one of the wheels l2 and there is secured to shaft 20 three cam wheels 55, one for each scraper and detent. One of the cam wheels is shown in section in Figures 8 and 9 from which it will be seen that it is provided in its periphery with a deep groove 55. One or more pins 56 extend across the groove a short distance from the bottom thereof.

A rod 51 has one end attached to the detent Q2 and the other end provided with a hook 58 that rests in the groove 55. When shaft 20 and cams 54 rotate clockwise (Figure 8)- the pin 56 engages the hook 523 and pulls the rod upwardly thereby moving the detent from operative to inoperative position. As soon as the detent is removed the scraper blade assembly starts rotating. As cam wheel 54 continues to rotate the bar 5! will en gage the bottom of the groove and the pin will move out of engagement with the hook thereby releasing the detent which is returned to oper ative position by the action of spring 45. A turn= buckle 59 serves to adjust the length of the rod 51 so as to secure the proper movement of the detent. Instead of a single pin 56 two or more pins can be employed and spaced equiangularly and in this way as many releases of the damming blade assembly, per revolution of shaft 213, can behad as may be necessary. It is seldom that more than two pins would be practical or neces- Referring now more particularly to Figure 2 it will be seen that the chisel 6 cuts a deep furrow F and following in the furrow, is a damming scraper blade which gathers the loose dirt for the dam. The trip mechanism is so timed that when a. suflicient amount of dirt has beengathered to make a dam as high as the wall of the furrow, the detent will be pulled out from blade engaging position, whereupon the blades will rotate. The detent is released almost immediately thereafter and is in position to engage the next blade.

It has been found that three blades placed 120 degrees apart are the proper number to beused because if two blades are used sufficient rotation will not be effected to bring the other blade into operative position and if more than three blades are used the blade to be next moved to operative position will carry along a portion of the dirt gathered for the dam.

The distance between the dams is determined by the speed ratio between the wheel l2 and shaft 20 and the number of pins 56, and is usually so calculated that the dams are between 3 and 5 feet apart. On fiat land the dams can be spaced much farther apart than where the land is inclined.

It is evident that when the lister furrows are inclined in the direction of their length the dams must be positioned quite close together to prevent the water from flowing from one depression to another.

The open construction of the damming blade prevents dirt from accumulating thereon and produces better operation and easier draft than if solid sheet metal blades were used.

Shaft 30 can rotate in its bearings if desired but the scraper blade assemblies are rotatable on the shaft so as to secure independent action.

Having described the invention, what I- claim as new is: '1. In a damming attachment for listers, a frame having two spaced parallel shafts, one of which is rotatably connected with' the lister, an equal number of similarly spaced bearings on each shaft, corresponding bearings forming pairs, a bar connected between the bearings of each pair and a pivoted connection between the ends of the bars and the bearings whereby the frame formed by the shafts and the bars can be shifted from a rectangular parallelogram to a rhomboid.

2. A damming attachment for a lister provided with a bar extending across the rear thereof, said attachment comprising in combination, a shaft rotatably supported from the bar, a second shaft positioned a short distance to the rear of the first shaft, a plurality of bearings on each shaft, the bearings being similarly spaced on the two shafts so as to form pairs, 22, bar connecting the bearings of each pair, the bars being of equal length whereby a plurality of parallelograms are defined by the shafts and bars, whose shape can be varied from that of rectangular to oblique angled, a plurality of scraper blade assemblies rotatably mounted on the rear shaft, for independent rotation, a

detent for each assembly, pivoted to the bars, and

means operated by the rotation by the front shaft for periodically moving the detent to permitv a rotation of the assembly.

3. A frame for a lister damming attachment, comprising, in combination, two spaced parallel shafts, an equal number of bearing blocks carried by each shaft, and similarly spaced so as to form pairs, bars of equal length for connecting the block of each pair, the bars being pivotally connected with the blocks, whereby a plurality ofparallelograms are formed whose shapes can be changed from rectangular to rhomboidal,

4. A lister damming. attachment, comprising, in combination, two spaced parallel shafts, an equal number of bearing blocks carried by each shaft, and similarly spaced so asto form pairs,bars

of equal length for connecting the blocks of each pair, the bars being pivotally connected with the blocks, whereby. a plurality of parallelograms are formed whose Shapes can be changed from rectangular to rhomboidal, a section of pipe rotatably mounted on one of said shafts, between each two adjacent bearings, a scraper blade assembly carried by each pipe section, each assembly comprising a plurality of radially extending blades, a detent mechanism pivoted to the bars on opposite sides of the assembly and means comprising a cam carried by the other shaft for moving the detent to inoperative position as the cam is rotated.

5. A damming attachment for listers, comprising, in combination, a shaft, means rotatably connected therewith for supporting it from a lister, a plurality of bearings carried by the shaft, a second shaft spaced from and substantially parallel with the first shaft, a number of bearings equal to the number on the first shaft, carried by the second shaft, the bearings. being similarly positioned on both shafts, bars connecting corresponding bearings, the bearings being pivotally connected with the ends of the bars, the bars and shafts forming parallelograms which may be changed from rectangular to rhomboidal, one shaft having tubular spacers between adjacent bearings, scraper blade assemblies on the tubular spacers, a detent mechanism for each assembly and means controlled by between the bearings, two spaced hubs on the' pipe, each hub having a plurality of radial arms, a flat bar of substantially U-shape connected with each pair of arms, each U-shaped bar having a plurality of parallel spaced bars secured thereto at one end, a detent carried by the bars connecting the bearings, and means controlled by the rotation of the other shaft for moving the detent.

'7. A scraper blade assembly for use with a lister damming attachment, comprising two hubs each having a plurality of radial arms, a'flat bar of U-shape, for each pair of arms, the ends of the U-shaped bar being connected with the arms and a plurality of fiat bars connected at one end with the U-shaped bar.

8. A damming attachment for listers, comprising a frame having fore and aft spaced parallel shafts, the front one of which is rotatably connected with the lister, an equal number of similarly spaced bearings on each shaft, corresponding bearings forming pairs, a bar connected between the bearings of .each pair and a pivotal connection between the ends of the bars and the bearings, whereby the frame formed by the shafts and the bars can be shifted from a rectangular parallelogram to a rhomboid, and soil engaging means supported from the rear shaft.

9. A scraper blade assembly for use with a lister damming attachment, comprising two hubs each having three radial arms spaced substantially 120 apart, a flat U-shaped bar for each pair of arms, the ends of the U-shaped bar being. connected to the arms, and a plurality of fiat bars attached to each of said U-shaped bars.

10. An implement comprising a frame, a ground-working tool carried thereby adapted to form a furrow as the implement is drawn forwardly, a damming device including a scraper disposed to operate in the furrow made by said ground-working tool, and means for connecting but without changing the angular relation between said scraper and said frame.

11. An implement comprising a frame, a plurality of transversely spaced ground-working tools adapted to form parallel furrows as the implement is drawn forwardly, a damming device comprising a transverse support, parallel links pivotally connected to said support andto said.

frame whereby said support is free to swing laterally, and a plurality of scrapers disposed on said support and disposed to travel in the furrows formed by said ground-working tools.

12. An implement comprising a frame, a ground-working tool carried thereby adapted to form ,a furrow as the implement is drawn forwardly, a damming device comprising a scraper disposed rearwardly of said ground-working, tool and disposed to operate in the furrow formed thereby, a support for said scraper, and a pair of parallel links pivotally connected to said support and to said frame to permit said support to swing laterally with respect to said frame responsive to the guiding action of said scraper in the fur- IOW- 13. An implement comprising a frame, a ground-Working tool carried thereby adapted to form a furrow as the implement is drawn forwardly, a damming device including a rotatable scraper assembly disposed to operate in the furrow made by said ground-working tool, said assembly comprising a plurality of blades extending radially from the axis of rotation, and detent mechanism therefor, and means for connecting said device to said implement frame whereby said scraper is free to follow in said furrow when said implement is drawn in a curved path.

14. Animplement comprising a frame, a plurality of ground-Working tools carried thereby adapted to form furrows as the implement is drawn forwardly, a damming device including a plurality of independently rotatable scraper assemblies disposed to operate in the furrows made by said ground-Working tools, each of said assemblies comprising a plurality of blades extending radially from the axis of rotation, and detent mechanism therefor, and means for connecting said scrapers to said implement frame permitting said scrapers to follow in their respective furrows when said implement is drawn in an irregular path.

15. An implement comprising a frame, a ground-working tool carried thereby adapted to form a furrow when the implement is drawn forwardly, a damming device including a scraper disposed to operate in the furrow made by said ground-working tool, means for connecting said device to said implement frame, said connecting means providing for free lateral and vertical movement of said device relative to said frame, and spring-mounted supporting means for at least partially supporting said device on said frame.

16. An implement comprising a frame, a plurality of transversely spaced ground-working tools adapted to form parallel furrows as the implement is drawn forwardly, a damming'device comprising a transverse support, a damming scraper for each of said tools mounted on said support, means pivotally connecting said support to said frame permitting free lateral and vertical movement of said support relative to said frame, and spring-mounted supporting means for at least partially supporting said support on said frame.

17. An implement comprising a frame, a. ground-working tool carried thereby to form a furrow as the implement is drawn forwardly, a damming device including a rotatable scraper assembly, said assembly comprising a plurality of blades extending radially from the axis of rotation, said blades being adapted to lightly scrape the sides of said furrow, one blade at a time, to accumulate dirt in front of the blade for making a dam, and resilient means for regulating the pressure of said scraper assembly upon the sides of the furrow, to limit the rate of accumulation of dirt.

18. An implement comprising a frame, a plurality of transversely spaced ground-working tools adapted to form parallel furrows as the implement is drawn forwardly, a damming device "comprising a transverse support, means pivotally connecting said support relative to said frame, a plurality of rotatable scraper assemblies disposed on said support, said assemblies each comprising a plurality of blades extending radially from the axis of rotation, each of said scraper assemblies being adapted to accumulate dirt from the sides of one of said furrows, respectively, and spring means for determining the depth of operation to determine the rate of accumulation of dirt.

19. In a lister damming device, a rotatable scraper assembly comprising three blades extending outwardly radially from the axis of rotation, spaced 120 apart, each of said blades comprising a peripherally extending scraping bar and means providing a working face carried on said bar, said face being concave in both radial and axial directions. 20. A scraper blade for a lister damming device, said blade comprising a peripherally extending scraping member and a. spoon-shaped working face at least partially encircled by said scraping member.

21. A scraper blade for a lister damming device, said blade comprising a peripherally extending scraping member and a plurality of curved bars extending inwardly therefrom, said bars defining a spoon-shaped working face.

22. An implement comprising a frame, a

ground-working tool carried thereby adapted to form a furrow as the implement is drawn forwardly, a damming device comprising a support disposed rearwardly of said ground-working tool, a pair of parallel links pivotally connected to said support and to said frame to permit said support to swing freely laterally with respect to said frame, means for at least partially supporting said support resiliently on said frame, and a scraper carried by said support and disposed to operate in the furrow formed by said groundworking tool.

23. An implement comprising a frame, a ground-working tool carried thereby adapted to form a furrow when the implement is drawn forwardly, a damming device including a scraper disposed to operate in the furrow made by said ground-working tool, means for connecting said device to said implement frame, said connecting means providing for free lateral and vertical movement of said device relative to said frame, and spring-mounted supporting means for at least partially supporting said device on said frame and for biasing the damming device toward a position in longitudinal alignment with said frame.

24. An implement comprising a frame, a plurality of transversely spaced ground-working tools adapted-to form parallel furrows as the implement is drawn forwardly, a damming device comprising a transverse support, means pivotally connecting said sunnnrt to said frame perming device toward a predetermined normal po sition relative to said frame, said supporting means including springs extending diagonally upwardly and diagonally laterally from said damming device.

25. An implement comprising a frame, a

' ground-working tool carried thereby adapted to form a furrow when the implement is drawn forwardly, a damming device including a scraper disposed to operate in the furrow made by said ground-working tool, means for connecting said device to said implement frame, said connecting means providing for free lateral and vertical movement of said device relative to said frame,

and supporting means for at least partially supporting said device on said frame.

26. An implement comprising a frame, a plurality of transversely spaced ground-working tools adapted to form parallel furrows as the implement is drawn forwardly, a damming device comprising a transverse support, a damming scraper disposed to operate in the furrow made by each of said tools mounted on said support, means pivotally connecting said support to said frame providing free lateral and vertical movement of said support relative to said frame, and means for restraining downward movement of said support relative to said frame.

27. In combination, an implement including a plurality of transversely spaced ground-working tools adapted to form parallel furrows as the implement is drawn forwardly, a plurality of damming blades swingably connected to said implement for free lateral and vertical movement relative thereto, and means for limiting downward movement of said blades relative to said implement.

28. An implement comprising a frame, a ground-working tool carried thereby to form a furrow as the implement is drawn forwardly, a damming device including a rotatable scraper assembly, said assembly comprising a plurality of blades extending radially from the axis of rotation, said blades being adapted to scrape the sides of said furrow, one blade at a time, to accumulate dirt in front of the blade for making a dam, and means connecting said device to the frame for limiting downward movement of said device relative to said frame to limit the rate of accumulation of dirt by said device.

29. An implement comprising a frame, a plurality of transversely spaced ground-working tools adapted to form parallel furrows as the implement is drawn forwardly, a damming device comprising a transverse support, means pivotally connecting said support relative to said frame, a plurality of rotatable scraper. assemblies disposed on said support, said assemblies each comprising a plurality ofblades extending radially from the axis of rotation, each of said scraper assemblies being adapted to accumulate dirt from the sides of one of said furrows, respectively, and means for restraining downward movement of said scrapers relative to said frame for limiting the rate of accumulation of dirt.

30. An implemement comprising a frame, a ground' working tool carried thereby adapted to form a furrow as the implement is drawn forwardly, a damming device including a rotatable scraper assembly disposed to operate in the furrow made by said ground-working tool, said assembly comprising a plurality of blades extending radially from the axis of rotation, and means for connecting said device to said implement frame whereby said scraper is free to follow in said furrowwhen said implement is drawn in a curved path,

31. An implement comprising a frame, a plurality of ground-working tools carried thereby adapted to form furrows as the implement is drawn forwardly, a damming device including a plurality of independently rotatable scraper assemblies disposed to operate in the furrows made by said ground-working tools, each of said assemblies comprising a plurality of blades extending radially from the axis of rotation, and means for connecting said scrapers to said implement frame permitting said scrapers to follow in their respective furrows when said implement is drawn in an irregular path.

32. An implement comprising a frame, a ground-working tool carried thereby adapted to form'a furrow when the implement is drawn forwardly, a damming device including a scraper disposed to operate in the furrow made by said ground-working tool, means for connecting said device to said implement frame, said connecting means providing for free lateral and vertical movement of said device relative to said frame,

and means for biasing the damming device toward a-position in longitudinal alignment with said frame.

33. An implement comprising a frame, a ground-working tool carried thereby adapted to form a furrow when the implement is drawn forwardly, a damming device including a scraper disposed to operate in the furrow made by said ground-working tool, means for connecting said device to said implement frame, said connecting means providing for free lateral and vertical movement of said device relative to said frame, and means for yieldingly resisting lateral swingmg.

34. An implement comprising a frame, a furrow forming tool carried thereby, a damming device including a rotatable scraper assembly disposed to operate in the furrow made by said tool, said assembly comprising a plurality of blades extending radially from the axis of rotation, and detent means therefor, means for connecting said device to said implement frame, said connecting means providing for lateral and vertical swinging movement of said device relative to said frame, and means for yieldingly resisting said lateral swinging movement.

35. An implement comprising a frame, a ground-working tool carred thereby, a rotatable scraper assembly comprising a plurality of blades extending substantially radially from the axis of rotation, a draft beam connected thereto, means for pivotally connecting said draft beam to said frame for lateral swinging with respect thereto, detent means mounted on said pivoted draft beam, for preventing rotation of said rotatable assembly, and means for intermittently disabling said detent means.

36. An implement comprising a frame, a ground-working tool carried thereby, a rotatable scraper assembly comprising a plurality of blades extending substantially radially from the axis of, rotation, a draft beam connected thereto, means for pivotally connecting said draft beam tosaid frame for lateral swinging with respect thereto, and means mounted on said beam for alternately detaining and releasing said rotatable scraper assembly with respect to rotary movement about its axis of rotation.

37. An implement comprising a frame, a plurality of ground-working tools carried thereby, a plurality of rotatable scraper assemblies disposed rearwardly of said tools, each assembly comprising a plurality of substantially radially extending blades disposed about a transversely extending axis of rotation, draft beams for said scraper assemblies, means for pivotally connecting said beams to said frame for lateral swinging with respect thereto, and detent means mounted on said pivoted draft beams for preventing rotation of said rotatable assemblies, said detent means being intermittently disabled to permit rotation of said assemblies. 1

- 38. In combination, a frame, a plurality of independently rotatable damming scrapers disposed rearwardly of said frame, at least one draft beam connected to each of said scrapers, means for pivotally connecting said beams to said frame for lateral swinging relative thereto, and an individual disengageable detent for each of said rotary scrapers for restraining the latter against rotation.

39. In combination, a frame, a plurality of independently rotatable damming scrapers disposed rearwardly of said frame. each of said scrapers comprising three radially extending blades spaced 120 apart about a transversely extending axis of rotation, at least one draft beam connected to each of said scrapers, means for pivotally connecting said beams to said frame for lateral swinging relative thereto, and an-individual disengageable detent for each of said rotary scrapers for restraining the latter against rotation.

40,.In combination, a frame, a. plurality of independently rotatable damming scrapers disposed rearwardly of said frame, at least one draft beam connected to each of said scrapers, means for pivotally connecting said beams to said frame for both lateral and vertical swinging relative thereto, and an individual disengageable detent for each of said rotary scrapers, said detents being mounted on said pivoted beams.

41. An implement comprising a plurality of laterally spaced furrow forming tools, rotary damming scrapers disposed behind certain of said tools, respectively, to follow in the furrows formed thereby, each of said scrapers being independently rotatable, at least one draft beam for each of said rotary scrapers, means for pivotally connecting said beams to said tools for lateral swinging relative thereto, individual detent means associated with each of said rotary 4 damming scrapers, said detent means being mounted on said draft beams, and means for individually disabling each of said detent means to permit rotation of said scrapers.

42. A scraper blade for a damming device, comprising a supporting bracket, a peripherally extending scraping. memberattached to said bracket, said scraping member including a pair of converging side portions and an end portion defining a blunt end on said blade, and means supported on said scraper member for retaining and accumulating material gathered by said scraping member.

43. In a scraper blade for a furrow damming device, a peripherally extending scraping bar including converging side portions disposed at an angle to each other that is approximately equal to the angle defined by the sides of the furrow, and means, supported on and extending between said side portions, for retaining and accumulating soil scraped from the sides of the furrow by said scraping bar.

44. A scraper blade for a furrow damming devic comprising a peripherally extending support ing member and a pluralityof bars defining a working face, each of said bars being supported at one end thereof on said supporting member and extending inwardly therefrom, the opposite ends of said bars being free.

45. In a rotary damming device, an axially disposed supporting member, a U-shaped peripherally extending scraping member, and a plurality of bars fixed at one end thereof to said peripheral member and extending substantially parallel to each other toward said axial supporting member, defining a working face, each of said bars being unsupported at one end thereof.

46. In combination with an implement including a frame, a damming device connected thereto and adapted to be drawn thereby, said damming device comprising a rotatable assembly of scraper blades extending radially from the axis of rotation, said blades being adapted to scrape the sides of a previously formed furrow, one blade at a time, to accumulate dirt in front of the blade for vice moves forwardly, and spring means asso-- ciated with each of said scraper assemblies for determining the depth of operation to determine the rate of accumulation of dirt.

48. In combination with an implement comprising a frame, a damming device comprising a transverse support, scrapers disposed on said supportp'and adapted to travel in pre-formed furrows, parallel links pivotally connected at one end to said support and universal joint means for connecting the opposite ends of said links to said frame, said support being free to swing vertically and laterally responsive to the guiding action of said scrapers in the furrows.

49. In combination; a supporting frame, a damming device including an earth collecting blade, means for connecting said device to said frame, said connecting means providing for free lateral and vertical movement of said device relative to said frame, and spring mounted supporting means for at least partially supporting said device on said frame.

50. In combination, a. supporting frame, a damming device comprising a support, an earthcollecting blade carried thereby, a pair of parallel links pivotally connected to said supportand to said frame, permitting said support to swing freely laterally withrespect to said frame, and means for at least partially supporting said support resiliently on said frame.

frame providing free lateral and vertical movement of said device relative to said frame, and

means for restraining downward movement of said device relative to said frame. 52. In combination, a supporting frame, a

damming device including a rotatable assembly of blades extending radially from the axis or rotation, said blades being adapted to engage the earth, one blade at a time, to accumulate earthfor making a dam, and means connecting said device to said frame for limiting downward movement of said device relative to the frame.

53. In combination, a frame, a damming device including a rotatable scraper assembly comprising a plurality of scraper blades extending radially from the axis of rotation, and means for pivotally connecting said device to said frame providing free lateral swinging of said device relative to said frame responsive to the guiding action of said scraper when it is operated in a pro-formed furrow.

54. In combination, a supporting frame, a

damming device including a rotatable scraper assembly comprising a plurality of scraper blades extending outwardly from the axis of rotation, a draft beam for said scraper assembly, and means for pivotally connecting said draft beam to said frame, said connecting means providing free lateral and vertical swinging of said device relative to said frame responsive to the guiding action of said scraper assembly when it is operated in a pre-formed furrow.

55. In combination, a supporting frame, a damming device including a scraper blade, a draft beam therefor, means for pivotally connecting said device to said frame providing for free lateral and vertical swinging of said device relative to said frame, and means for yieldingly resisting lateral swinging.

56. In combination, a supporting frame, a damming device including a rotatable scraper assembly comprising a plurality of blades extending radially from the axis of rotation, means for pivotally connecting said device to said frame, said connecting means providing for free lateral and vertical swinging movement of said device relative to said frame, and means for yieldingly resisting said lateral swinging movement.

57. In combination, a supporting frame, a rotatable scraper assembly comprising a plurality of blades extending substantially radially from the axis of rotationfa draft beam connected to said scraper assembly, means for pivotally connecting said draft beam to said frame for lateral swinging with respect thereto, and means mounted on said beam for alternately detaining and releasing said rotatable scraper assembly with respect to rotary movement about its axis of rotation.

' CHARLES T. PEACOCK.