WO2001030131A1

WO2001030131A1 - Roller plough

Info

Publication number: WO2001030131A1
Application number: PCT/HU2000/000113
Authority: WO
Inventors: István PÉNTEK, Jr.; István PÉNTEK, Sr.
Original assignee: Pentek Istvan Jr; Pentek Istvan Sr
Priority date: 1999-10-25
Filing date: 2000-10-25
Publication date: 2001-05-03
Also published as: AU1291701A; HUP9903800A2; HU9903800D0

Abstract

The invention relates to a roller plough comprising a plough frame (2) and a plough body (3) mounted thereon with a plough body mounting, and further a breast board (9), and one or more breast board rollers (10, 11, 12) rotating on an axle (13). A plough-iron (20) is also secured to the plough body (3). The roller plough further comprises a support wheel (21) arranged behind the plough body. According to the invention, at least one breast board roller (10, 11, 12) comprises means for crushing the soil turned out by the breast board. There is also disclosed a plough body mounting comprising a height adjustment piece (4) fastened to the plough body (3) with a releasable or fixed fastening. The height adjustment piece (4) comprises one or more points of rotation, which are perpendicular to the plane of the plough body (3). The rear end of the plough frame (2) comprises a sheath-like receptacle (6) with openings (7) for receiving pins. Further supporting elements, preferably screws (8) are positioned in the side or barrel of the receptacle (6).

Description

ROLLER PLOUGH

Technical Field

The invention relates to a roller plough, which comprises a plough frame (plough-beam) and a plough body mounted thereon, a breast board formed with a helicoidal surface and one or more breast board rollers rotating on an axis of rotation as well as a plough-iron are secured to the plough body. A support wheel is arranged behind the plough body. Optionally, the roller plough may further comprise a disc coulter arranged in front of the plough-iron.

Background Art

In agriculture there is a constant need for continuous improvement of machines for soil-cultivation so as to make the hard physical work of soil- cultivation easier. Hungarian Patent Application No. 145669 describes an agricultural machine for soil-cultivation, particularly a plough. This agricultural machine has one or more rolling components beside its impellers. These rolling components are made of or comprise on their surface a special compliant, resilient, self-cleaning material. These components are the support wheel and the breast board roller. Hungarian Patent Application No. 194001 describes a roller bed plough which may also be operated with human force. This known roller bed plough is provided with a plough-iron mounted on the plough body plate, and a hidden coulter effecting a vertical cutting of the soil, tilting backwards and from down to upwards from the nose portion of the plough iron. Behind these elements self-cleaning, wear resistant breast board rollers are arranged in support consoles which are fastened to a light tubular frame so as to provide a twisted and rotating working surface. During operation these components roll partly on a supporting wheel having an adjustable, vertically movable screw spindle unit, which latter is secured to the plough body plate and partly roll on depth adjustment wheels, which latter are also mounted on the front part of the tubular frame in a vertically adjustable manner. The adjustment of the support wheel and the depth adjustment wheels enables the optimum setting of the angle between the horizontally cutting plough-iron and the cutting-edge of the vertically cutting hidden coulter. The roller bed plough is provided with a weight- box, the position of which is variable. The bed plough further comprises a drawing bar, which can be positioned and fastened in holes of a fork by means of screws inserted in the holes of the fork. The fork is mounted on the front part of the roller bed plough, and allows the adjustment of the drawing height.

Use of the ploughs known from the aforementioned patents provided improvement in soil-cultivation but several problems remained. The angle of inclination of the plough body could be controlled essentially only by the supporting wheel, which influenced at the same time the ploughing depth. The construction of the known hidden coulters were not satisfactory, because the soil and the stalk- residues in the soil tended to be compressed at the edge of the plough iron and the breast board, as well as at the first edge of the plough body, and thereby posed an obstacle for the cultivation of the soil and the proper functioning of the hidden coulter. The positioning of the breast board and the breast board rollers are also disadvantageous, because the first breast board roller covered a part of the breast board, or it were positioned too far from it. Further, the rear breast board roller was not sufficiently inclined towards the soil, and as a result, the turning over of the soil was unsatisfactory.

In case of the recently used ploughs, the generally scalloped (serrated) disk coulter is secured too high, i. e. too close to the plough frame (plough-beam), and it is positioned too close to the plough bottom. ). Therefore, soil and stalk or plant- residues are wedged between the plough body and the disk coulter, hindering operation of the plough. The surface of the pre-cutter did not extend sufficiently from the coulter, and it was positioned too high, due to the reasons above. Flat disk shaped coulters had a considerable friction, and therefore were subject to excessive wear, posing further difficulties in soil-cultivation. It is an object of the present invention to eliminate or at least alleviate these disadvantages.

It was recognised that by fastening the breast board and the plough-iron closer to the front on the plough body, the operation of the coulter is improved. Further, if the disk shaped coulter is fixed farther away from the plough and deeper, the blocking of the plough is eliminated. Turning over of the soil can be improved by positioning the breast board in a manners so that it partly covers the first breast board roller, as well as by increasing the inclination of the rear breast board roller towards the soil. In case of dry soils, the spreading of the soil becomes more even, if the surfaces of the breast board rollers are made from a non-resilient material. With more moist soils, good results may be achieved by forming cutting knives on the surfaces of the breast board rollers. With wet soils, the use of air tubes with a variable resilience proved particularly advantageous.

It was further recognised that by controlling the inclination and the height of the plough body plate a much more satisfactory adjustment may be achieved, as compared with the situation when the controlling of the soil-cultivation depth is done only with the support wheel.

Further it was recognised that if the disk of the disk shaped coulter is formed as a segment of sphere, not only friction can be decreased significantly, but the device is made self-sharpening, and the position control of the coulter shaft allows satisfactory adjustment of the coulter, according to the positioning of the plough body plate.

Summary of the Invention The invention provides a roller plough comprising a plough frame (plough- beam) and a plough body mounted thereon with a plough body mounting. A breast board with a helicoidal surface, and one or more breast board rollers rotating on an axle, and further a plough-iron are secured to the plough body. The roller plough further comprises a support wheel arranged behind the plough body. According to a first aspect of the invention, at least one breast board roller comprises means for crushing (breaking up) the soil turned out by the breast board.

Due to the crushing means, much better breaking up and soil crushing is achieved with the plough of the present invention, as compared with known ploughs. The level of the breaking up is so high, that in many instances it is not necessary to perform further amelioration and soil preparation before sowing. For example, disk-cultivating, harrowing, and similar soil cultivation operations to prepare for the sowing may be completely omitted, resulting in significant savings in work hours and fuel. Advantageously, the crushing means is constituted by the proper forming of the breast board roller surfaces, e. g. in the manner where at least one breast board roller has a structured surface.

With a different solution, the crushing means are constituted by the barrel of at least one breast board roller, which has an elastic surface with a variable elasticity.

The invention further concerns the structure of the plough body mounting. This mounting substantially comprises a height adjustment piece fastened to the plough body with a releasable or fixed fastening. The height adjustment piece comprises one or more points of rotation, preferably bores, which are perpendicular to the plane of the plough body. The rear end of the plough frame comprises a preferably sheath-like receptacle with openings, preferably bores for receiving pins. Supporting elements, preferably screws are positioned in the side or barrel of the receptacle further away from the plough frame, preferably in the centre line of the receptacle. The invention further relates to a disc coulter applied with the roller plough of the first aspect of the invention. The disk coulter comprises a coulter shaft and coulter disk, where the coulter shaft is rotatably fastened to the plough frame. The coulter disk has a spherical cap surface, and further the curvature of the spherical cap surface is determined so that the radius of the base circle is at least five times of the height of the spherical cap

Brief Description of Drawings The roller plough of the invention is described in detail with reference to the drawings. Fig. 1 is a side view of the roller plough, with one type of plough body mounting. Fig. 2 is a side view of the roller plough, with another type of plough body mounting, primarily for use as a hoeing plough, or for ploughing in a ridging form. Fig. 3 is a rear view of the plough body mounting of Fig. 1 , without the further parts mounted on the plough body. Fig. 4 is a rear view of the plough body mounting of Fig. 1 , in an embodiment for alternatively changing soil rotation, without the further parts mounted on the plough body. Figs. 5 and 6 are a rear view of the right and left side plough bodies mountable on the roller plough of Fig. 2, and their mounting, where no further parts are shown except the breast board and the stubs. F Fiigg.- 7 7 is a side view of the plough bodies mounted on the roller plough of

Fig. 2 and their mounting, for keel formed ploughing,

Fig. 8 shows the fastening of the coulter shaft to the plough frame,

Fig- 9 is a the A-A section of the plough body and the breast board,

Fig. 10 is a side sectional view of the coulter disk. Fi **g£_.• 1 1 11 is a side view of a possible embodiment of the breast board rollers,

Fig. 12 is a top view of the breast board roller of Fig. 1 1.

Fig. 13 is a side view of a further possible embodiment of the breast board rollers, Fig. 14 is a top view of the breast board roller of Fig. 13. Fig. 15 is a side view of a further possible embodiment of the breast board rollers, Fig. 16 is a top view of the breast board roller of Fig. 15.

Fig. 17 is a side view of a further possible embodiment of the breast board rollers,

Fig. 18 is a top view of the breast board roller of Fig. 17.

Best Mode for Carrying out the Invention

The structure of the roller plough 1 according to the invention is similar to that of known roller ploughs. A plough body 3 is mounted on the plough frame 2, and the breast board 9, the plough iron 20, the upper part 27, the insert 28 and lower part 29, and further the lower shaft 30 and upper shaft 31 are mounted on the plough body 3. Front, inner and rear breast boards 10,1 1 and 12 are mounted between the upper part 27 and lower part 29. The plough iron 20 is a continuation of the arc of the breast board 9. The breast board 9 is fastened to the to the upper part 27, insert 28 and lower part 29 with sunk screws, in a manner so that their front edge extends at an acute angle before the plough body 3, preventing thereby the compressing of the soil at the front edge of the plough body 3. The plough support wheel 21 is fastened at the common ends of the upper shaft 31 and the lower shaft 30. The front breast board roller 10 is positioned between the upper part 27 and the lower part 29 so that the breast board 9 partly covers the front breast board roller 10, while the rear breast board roller 12 is positioned strongly tilting towards the soil, in an angle of 45-70 degrees to the soil, thereby significantly improving the efficiency of the turning of the soil. According to the invention, at least one breast board roller of the roller plough comprises means for crushing or breaking up the soil turned out by the breast board, i. e. the breast board rollers 10, 1 1 and 12 are made differently from the known breast board rollers, as shown in Figs. 1 1 to 18. For example, at least one breast board roller has a structured surface. This structured surface is achieved with a proposed embodiment, which is shown with the breast board roller in Fig. 1 1 , so that the cross section of the breast board roller perpendicular to its central axis has a contour different from a circle. This latter is well visible in Fig. 12. Here, the barrel of the breast board roller (a so-called winged roller) comprises axially oriented wings 14 fastened to the axle 13, preferably by welding, and made from sheet material.

Similarly, it has proved advantageous to realise the means for crushing with a structured surface with an embodiment, where the generatrices of the barrel of the breast board rollers are different from a straight line. This embodiment is illustrated in Fig. 13. In this case the barrel of the breast board roller is comprised of disks 15 arranged beside each other along the axle 13 (a so-called disk roller). Figs. 13 and 14 clearly illustrate that the disks 15 is constituted by a pair of frusto-conical pieces, turned towards each other with their base. In this manner the edge at the joining of the bases advantageously adds to the crushing of the soil, while the grooves between the disks 15 strongly expand outwards, so the soil is less likely to stick between the disks 15.

For cultivation of dry soils, it is advantageous to use a breast board roller having wings fastened to the axle 13 by welding or comprising disks 15 arranged beside each other along the axle 13. Both the wings 14 and the disk 15 made from sheet material by welding, and the wings 14 and disks 15 also welded to the axle 13. In a further embodiment of the invention, the means for crushing the soil are constituted by the surface of the breast board roller having an elastic surface with a variable elasticity. It has been recognised that the rubber rollers of the earlier solutions with a fixed elasticity was not adequate, because the elasticity or flexibility of the roller could not be adjusted to the specific soil moisture content. The embodiment with the variable elasticity surface is shown in Fig. 15. Here, the breast board roller is formed a gas cylinder 19 having resilient wall, being advantageously filled with air and preferably comprising a valve 18 (a so-called air roller). Fig. 14 shows a further preferred embodiment of the breast board rollers. With this latter version, the barrel of the breast board roller is constituted by helicoidally formed plates 16 at a distance from each other (a so-called twisted roller). The ends of the plates 16 are fastened to bases 17 at the ends of the axles 13. For more moist soils it is more advantageous to use these two latter breast board embodiments, where the breast board roller comprises helicodially formed plates 16 at a distance from each other, the ends of which are fastened to bases 17 at the ends of the axles 13, or where an air cylinder 19 with resilient walls is positioned between the bases 17, where the pressure of the air cylinder 19 may be regulated by the valve 18.

The appropriate rollers may be used in any combination with each other, depending on the properties of the soil. In certain cases, the breast board rollers of the invention with means for crushing may be used in combination with the known rollers having a harder, suffer rubber cover (further referred to as rubber rollers). The disadvantage of these known rollers is that the elasticity of the rubber is not adjustable, and could not be fitted to the parameters of the soil. Therefore, the known rubber rollers were less effective when used on certain soil types and soil moisture values, as compared with the air rollers suggested by the invention.

Generally, the following roller combinations are proposed for dry soils:

first breast board roller second breast board roller third breast board roller

winged roller disk roller twisted roller winged roller twisted roller disk roller twisted roller

For more moist soils, the following is proposed: first breast board roller second breast board roller third breast board roller air roller disk roller twisted roller air roller disk roller > air roller twisted roller air roller rubber roller rubber roller air roller

It is noted that the third breast board roller may be omitted in many instances. This is mostly the case with large size ploughs.

A square section bar 40 is welded to the plough body 3, and in one embodiment, the height adjustment piece 4 is also welded to the square section bar 40. Bores 5 are provided on the height adjustment piece 4. A receptacle 6 is welded to the rear end of the plough frame 2, made of a square section bar or a U-shaped iron closed with a separate plate. On the side surfaces of the receptacle 6, openings 7 with a common axis are provided. In the centre line of the rear side of the receptacle 6 there is at least two threaded bores receiving screws 8.

The plough body 3 and the structures attached thereto are mounted onto the plough frame 2 as follows: The height adjustment piece 4 is inserted in the 0 receptacle 6, and a pin 25 is inserted through the openings 7 on the sides of the receptacle 6 and the bore 5 in the height adjustment piece 4. Thereafter, the tilting angle of the plough body 3 and the attached structures is adjusted with the screws 8, until the plough body is in the desired position.

According to another solution, there is provided a holder for the plough 5 body 3, where a support plate 39 is welded to the side of the square section bar 40, which latter itself is welded to the plough body 3. Depending on whether a right- hand or left-hand plough is desired, the support plate 39 is welded to the right side or the left side of the square section bar 40. In this case the height adjustment piece 4 is welded to a standalone square section bar, having at least four bores. The support plate 39, and therewith the plough body 3 and the structures thereon is attached to this standalone square section bar with fastening screws 26. This solution allows the simultaneous mounting of a right-hand and left-hand plough to the plough frame 2, for keel formed ploughing or for filling ploughing (hoeing plough). Otherwise the mounting and adjusting of the plough is performed as described earlier, i. e. as if the height adjustment piece 4 would be attached directly to the plough body.

The efficiency of the soil cultivation is greatly enhanced with the use of a disk-shaped coulter 22, or shortly disk coulter 22, which is held with the yoke 36 in the keel opening of an U-shaped piece, the latter being fastened to the plough frame 2. In previously known roller ploughs the disk coulter 22 was placed from the plough iron 20 at a distance of not greater than 150 millimetres.

According to the invention, the distance between the rear point of the disk 41 of the disk coulter 22 and the plough body 3 is at least 250 mm, more precisely, the front edge of the breast board 9 and the plough iron 20 is at no position closer to the rear edge of the disk 41 than 250 millimetres. With the proposed roller plough this distance was almost doubled, and therewith the problem of the soil and plant residues in the soil being stuck between the coulter and the plough iron 20 or the breast board 9 has been avoided. The disk coulter 22 is formed with a disk 41 having a spherical cap surface, and the curvature of the spherical cap surface is formed so that the radius of the base circle of the disk 41 is 200 millimetres, while the height m thereof is 5 millimetres. This results advantageously in a reduced friction in the soil, and the disk will be self-sharpening by its form. The disk 41 is mounted on the coulter support 37 with its convex surface.

The coulter shaft 23 is formed in a "Z" shape, and essentially consists of an upper shaft 34, a lower shaft 35 and a horizontal shaft 43. The upper shaft 34 is fastened to the plough frame 2 with the yoke 36, so that it may be rotated and it is vertically adjustable. The coulter support 37 is fastened to lower shaft 35 in a rotatable manner, simply with a screw which is screwed into the lower end of the lower shaft 35 through a washer, so that the end of the coulter support 37 abuts the lower end of the lower shaft 35 (not shown due to its simplicity). Above the coulter support 37, a clamp-like abutment 38 is positioned on the lower shaft 35, which may be tightened around the lower shaft 35 with a screw. The abutment 38 limits the upwards movement of the coulter support 37. Two limiters 42 are provided on the lower surface of the abutment 38, and the lower shaft 35 is placed between the limiters 42, which thereby limit the horizontal movement of the lower shaft 35. With this solution, it is possible to move the disk 41 to the side and away from the plough iron 20, as far as it is allowed by the horizontal shaft 43 of the disk coulter 22. Of course, the abutment 38 must be turned accordingly, after releasing the screw on the abutment 38. The support arm 33 is fastened to the coulter support 37, and an skimmer 32 is mounted on the other end of the support arm 33. The surface of the skimmer has been increased, which greatly enhanced its efficiency, and further it is placed from the concave side of the coulter disk 41 at a distance less than two millimetres, which again prevents the sticking of the soil and plant rests. In this manner, the edge of the skimmer 32, which turns towards the concave side of the disk 41 , is protected, i. e. the cutting edge covered by the arc of the concave side is subjected to much smaller forces. Thereby the skimmer 32 at the coulter may extend deeper, and prepares the soil more effectively for the breast board plate following the skimmer 32, where the breast board plate performs the deeper ploughing. Of course, the edge 24 of the disk 41 may be serrated in a known manner (not shown). The plough according to the invention may be drawn with manpower, if made in an appropriate size. In the practical realisation certain changes have been made as compared with traditional solutions, which improves the functioning of the plough and increases its lifetime. The two ends of the breast board rollers 10,1 1 and 12 are protected by a dust cover plate, the axle 13 is made of a thicker and stronger material, and its bearings are plastic and metal glide bearings, or needle roller bearings. With larger ploughs, it is suggested to use roller bearings with a suitable rating, according to the size of the enlarged axles. The bearings are protected within the dust cover by a greasy felt and a metal washer, and the dust cover is fastened by a sheet screw. The upper and lower support shafts 31 and 30 and the axle of the support wheel 21 is made of strong and thick material, according to the type and demand. The support wheel 21 is in fact a wheel which abuts the side of the furrow, and therewith provides a stable support for the plough, holding the breast board of the plate in appropriate position relative to the soil. The bearings of the support wheel 21 are plastic and metal glide bearings, or needle roller bearings, as dictated by the load and the demand. Similarly, the rim of the wheel is made according to the demand and load, when using a plastic wheel with a metal plate cover, or using a wheel made completely with a metallic stiffened rim, which will receive a rubber tyre. In both cases the bushing of the axle is integral with one of the cover plates. With an even greater load, air-filled wheel is used with a suitable tyre. Throughout the structure, the parts made of a square section bar are closed at their ends with a closing plate. The breast board 9 and the plough iron 20 is made of thick and wear- resistant material. The attachment of the roller plough according to the invention is formed so that a manual attachment is connected to a machine attachment, and in this manner a double application mode is provided: manual and mechanised pulling of the plough. The plough frame 2 may have a double joint formation (in effect creating a horizontal "Z" form), which allows the cultivation of the soil suitably close to the plants with plant cultures in rows (e. g. grapes, orchards). This would not be possible with a rigid plough frame. The improved approaching ability to the plants is further made possible by a solution where the weight box is fastened in a manner so that pre-formed fixed weights are fastened on the plough with an adapter instead of the weight box., which will further reduce lateral space requirement of the plough, i. e. the width of the plough. The mobile plough structure using the pin and screw fastening means allows to use the same plough frame for different pulling means, either for pulling by human or animal force. Optionally, further adapters may be used for this purpose (not shown). This advantage is most apparent with smaller ploughs, and provides good variation possibilities, with regard to the pulling means. The take-apart structure of the plough greatly facilitates maintenance and repair.

It is an advantage of our invention that the curvature of the plough head has been changed, and thereby the plough advances more smoothly and easily. By changing the bending and the fastening of the upper and lower pieces the soil turning ability and crushing ability of the plough improved. The breast board and the plough iron is positioned further away from the back plate of the plough, which will thereby function as a hidden coulter. With those ploughs where the height of the bow is adjustable, the angle of the plough head entering the soil may be adjusted, which eliminates the need for a weight box. The size of the plough frame was increased, and thereby the fastening of the plough head and the coulter is further apart from each other. Thereby the movement of the soil and the plant residues between the parts of the plough is improved. The length of the coulter shaft was also increased, providing further depth adjustment for the coulter. A serrated coulter is used, and the size of the skimmer is also larger, which ensures better rotation of the plant rests. At the breast board rollers the position of the lower and upper piece is modified at the portion for attaching the rear breast board roller, which resulted in a change of the tilting angle of the breast board roller, ensuring a 180 degrees rotation of the soil. Instead of the rubber rollers, crushing rollers and crushing disks made of metal are used, which, with dry soils, allows the ploughing to directly precede the sowing. With more moist soils, air cylinders with variable elasticity are used, which may be fitted to the moisture content of the soil.

Claims

Claims:

1. A roller plough comprising a plough frame (plough-beam) and a plough body mounted thereon with a plough body mounting, a breast board with a helicoidal surface, and one or more breast board rollers rotating on an axle, and further a plough-iron are secured to the plough body, the roller plough further comprising a support wheel arranged behind the plough body, characterised in that at least one breast board roller comprises means for crushing the soil turned out by the breast board.

2. The roller plough of claim 1 , characterised in that the barrel of at least one breast board roller ( 10, 1 1 , 12) is made of metal.

3. The roller plough of claim 1 or 2, characterised in that the barrel of at least one breast board roller (10, 1 1, 12) has a structured surface.

4. The roller plough of any one of claims 1 to 3, characterised in that the cross section of the breast board roller perpendicular to its central axis has a contour different from a circle.

5. The roller plough of any one of claims 1 to 4, characterised in that the barrel of at least one breast board roller (10, 1 1 , 12) comprises axially oriented wings ( 14) fastened to the axle ( 13), preferably by welding, and made from sheet material.

6. The roller plough of any one of claims 1 to 3, characterised in that the generatrices of the barrel of at least one breast board roller (10, 1 1 , 12) are different from a straight line.

7. The roller plough of any one of claims 1 to 3 and 6, characterised in that the barrel of at least one breast board roller ( 10, 1 1 , 12) is comprised of disks ( 15) arranged beside each other along the axle ( 13).

8. The roller plough of any one of claims 1 to 3, characterised in that the barrel of at least one breast board roller ( 10, 1 1 , 12) is constituted by helicoidal plates (16) at a distance from each other, the ends of which are fastened to bases (17) at the ends of the axles (13).

9. The roller plough of claim 1 , characterised in that the barrel of at least one breast board roller (10, 1 1 , 12) has an elastic surface with a variable elasticity.

10. The roller plough of claim 9, characterised in that the wherein the barrel of at least one breast board roller ( 10, 1 1 , 12) is constituted by a gas cylinder ( 19) having resilient wall, and advantageously filled with air and preferably comprising a valve ( 18).

1 1. The roller plough of any one of claims 1 to 10, characterised in that the breast board (9) and the plough-iron (20) are mounted at an angle to the plough body (3), with the front edges of the breast board (9) and the plough-iron (20) extending forward of the plough body (3), toward the hauling direction.

12. The roller plough of any one of claims 1 to 1 1 , characterised in that the rear edge of the breast board (9) partly covers the first breast board roller (10).

13. The roller plough of any one of claims 1 to 12, characterised in that the angle of the rear breast board roller (12) to the soil is between 45 degrees and 70 degrees.

14. The roller plough of any one of claims 1 to 13, characterised in that the plough body mounting comprises a height adjustment piece (4) fastened to the plough body (3) with a releasable or fixed fastening, the height adjustment piece (4) comprises one or more points of rotation, preferably bores (5), which are perpendicular to the plane of the plough body (3), the rear end of the plough frame (2) comprises a preferably sheath-like receptacle (6) with openings (7), preferably bores for receiving pins (25), and further supporting elements, preferably screws (8) are positioned in the side or barrel of the receptacle (6) further away from the plough frame (2), preferably in the centre line of the receptacle (6).

15. The roller plough of claim 14, characterised in that two receptacles (6) are formed beside each other at the rear end of the plough frame (2).

16. The roller plough of any one of claims 1 to 15, characterised in comprising means for increasing the weight of the plough.

17. The roller plough of claim 16, characterised in comprising a weight box.

18. The roller plough of claim 16 or 17, characterised in that fixed weights are mounted on the plough frame (2).

19. The roller plough of any one of claims 1 to 18, characterised in comprising a disc coulter arranged before the plough-iron, the disc coulter comprising a coulter shaft and coulter disk, the coulter shaft being rotatably fastened to the plough frame.

20. The roller plough of claim 19, characterised in that the coulter disk (41) has a spherical cap surface, and where the curvature of the spherical cap surface is determined so that the radius (r) of the base circle is at least five times of the height (m) of the spherical cap.

21. The roller plough of claim 19 or 20, characterised in that the coulter shaft (23) comprises an upper shaft (34), a lower shaft (35) and a horizontal shaft (43) arranged in a Z-form, the upper shaft (34) being connected to the plough frame (2) with a releasable fastening, preferably with a yoke (36), and providing a rotatable and vertically movable fastening, the lower shaft (35) having a coulter holder (37) rotatably attached thereto, and further the lower shaft (35) comprising a rotatable abutment (38) releasably fastened above the coulter holder (37).

22. The roller plough of any one of claims 19 to 21 , characterised in that the distance between the rear point of the disk (41) of the disk coulter (22) and the plough body (3) is at least 250 mm.

23. The roller plough of any one of claims 19 to 22, characterised in that the edge (24) of the coulter disk (41 ) is serrated.