BLADE TIP AND TOOL COMBINATION HAVING A BLADE TIP

Abstract

The invention relates to a blade tip and to a tool combination having a blade tip for an agricultural soil cultivation machine, wherein the blade tip has a base part which has a cutter and a cutter carrier, and a guiding element attached to the blade tip, wherein the blade tip has a screw receptacle for fastening to a tine of the agricultural soil cultivation machine. Here, provision is made for the base part to have a receptacle which is covered by means of a covering portion in the tool feeding direction, for the guiding element to have a plug attachment which is held in the receptacle, and for a form-fitting connection, which prevents any movement of the guiding element out of the receptacle, to act in the region of the receptacle between the blade tip and the guide element.

Claims

1. A blade tip for an agricultural soil cultivation machine, having a base part, having a cutter on a cutter carrier, the base part having a screw receptacle for fastening to a carrier, a tine of the agricultural soil cultivation machine, wherein the base part has a receptacle, which is covered in the tool feed direction by means of a covering portion, for fixing a plug attachment of a guiding element, which is insertable into the receptacle, and that the receptacle has at least one form-fitting element to form a form-fitting connection with at least one form-fitting counter element, attached to the plug attachment, such that movement of the guiding element out of the receptacle is prevented.

2. The blade tip according to claim 1, wherein the receptacle is opened towards a back side of the blade tip opposite the tool feed direction, that the receptacle is opened by means of a receptacle opening towards a front face of the base part opposite the cutter, and that the receptacle is enclosed by side walls extending from the covering portion to the side of the receptacle opening.

3. The blade tip according to claim 1, wherein the at least one form-fitting element is attached or molded on a surface delimiting the covering portion towards the receptacle and/or on a side wall of the receptacle.

4. The blade tip according to claim 1, wherein at least one form-fitting element is formed as at least one attachment protruding from the covering portion or a side wall into the receptacle and/or by at least one recess formed in the covering portion or a side wall.

5. The blade tip according to claim 1, wherein at least one form-fitting element is formed by at least one region of the receptacle tapering in the direction of the receptacle opening.

6. The blade tip according to claim 1, wherein the at least one form-fitting element is designed as a centering attachment or as a centering receptacle and/or that the at least one form-fitting element is designed as a ball attachment or as a ball receptacle.

7. The blade tip according to claim 1, wherein the covering portion has a second screw receptacle, or that the covering portion has a second screw receptacle and that the second screw receptacle is inserted through the at least one form-fitting element.

8. The blade tip according to claim 7, wherein the second screw receptacle is designed in the form of a blind hole with an end-side opening for inserting a fastening screw.

9. The blade tip according to claim 7, wherein the opening of the second screw receptacle is designed as a screw lock for non-rotatable affixing of the inserted fastening screw, in particular that the opening is designed in a shape other than a round cross-section, in particular in a rectangular or substantially rectangular shape.

10. The blade tip according to claim 1, wherein the receptacle is delimited laterally by two blocking pieces as side walls, arranged at a distance from each other transversely to the tool feed direction, and/or that the two blocking pieces transition into two insertion chamfers, spaced apart from one another, towards the receptacle opening.

11. The blade tip according to claim 10, wherein the form-fitting element is arranged at least partially between the blocking pieces and the blocking pieces are spaced apart in a range between 40 mm and 50 mm, preferably in a range between 44 mm and 48 mm, particularly preferred 46 mm, and/or that the insertion chamfers, extending from the blocking pieces, are arranged with a reciprocal opening angle in a range between 50° and 70°, preferably in a range between 58° and 62°, particularly preferably 60°.

12. The blade tip according to claim 1, wherein a projection, which protrudes over a deflecting surface, is associated with the screw receptacles and/or the second screw receptacle in front in the tool feed direction, and/or that the screw receptacle and/or the second screw receptacle each have a recess into which one screw head each of an inserted fastening screw can be introduced, offset from the deflecting surface.

13. A tool combination with a blade tip for an agricultural soil cultivation machine, the blade tip having a base part, having a cutter on a cutter carrier, and a guiding element attached to the blade tip, the blade tip having a screw receptacle for fastening to a tine of the agricultural soil cultivation machine, wherein the base part has a receptacle, which is covered by a covering portion in the tool feed direction, the guiding element has a plug attachment that is held in the receptacle, and a form-fitting connection being operative in the region of the receptacle between the blade tip and the guiding element, preventing movement of the guiding element out of the receptacle.

14. The tool combination according to claim 13, wherein the receptacle is opened towards a rear side of the blade tip opposite the tool feed direction, that the receptacle is opened towards a front side of the base part opposite the cutter by means of a receptacle opening, that the receptacle is enclosed on the side of the receptacle opening by side walls, projecting from the covering portion, that the plug attachment of the guiding element is inserted into the receptacle through the receptacle opening, that at least one form-fitting element is attached or formed on a surface delimiting the covering portion from the receptacle and/or on a side wall of the receptacle, and that the plug attachment has at least one form-fitting counter-element corresponding to the form-fitting element.

15. The tool combination according to claim 13, wherein at least one form-fitting element is formed as at least one attachment protruding from the covering portion or a side wall into the receptacle and/or by at least one recess formed in the covering portion or a side wall and that the at least one form-fitting counter element engages with the recess or that the attachment engages with the at least one form-fitting counter element.

16. The tool combination, according to claim 13, wherein at least one form-fitting element is formed by at least one region of the receptacle tapering in the direction of the receptacle opening and that the at least one form-fitting counter element is formed by at least one region of the plug attachment, tapering in the direction of the receptacle opening.

17. The tool combination, according to claim 13, wherein at least one form-fitting element is designed as a centering attachment and/or that the at least one form-fitting counter element is designed as a centering receptacle or that the at least one form-fitting element is designed as a centering receptacle and the at least one form-fitting counter element is designed as a centering attachment, wherein each of the centering attachments engages with the centering receptacle, and/or that the centering attachment is designed as a ball attachment or the centering receptacle is designed as a ball receptacle.

18. The tool combination, according to claim 13, wherein at least one form-fitting counter element is formed as a bead molded into the plug attachment.

19. The tool combination, according to claim 13, wherein the guiding element is connected to the tine and that an additional form-fitting connection is provided in the boundary surface between the guiding element and the tine and/or that an additional form-fitting connection is provided between the guiding element and the base part.

20. The tool combination, according to claim 13, wherein the base part of the blade tip has a form-fitting element in the region of the receptacle that engages with a form-fitting counter element on the plug attachment of the guiding element and with a form-fitting counter element of the tine and/or that the plug attachment of the guiding element has a form-fitting element that engages with a form-fitting counter element of the base part of the blade tip and with a form-fitting counter element of the tine and/or that the tine has a form-fitting element that engages with a form-fitting counter element of the plug attachment of the guiding element and with the form-fitting counter-element of the base part of the blade tip.

21. The tool combination, according to claim 13, wherein the blade tip and the guiding element are form-fittingly blocked with respect to one another transversely to the tool feed direction by means of one or more blocking pieces and that the blade tip and the guiding element form-fittingly blocked with respect to one another in and against the insertion direction of the plug attachment into the receptacle by means of the form-fitting element and the form-fitting counter element.

22. The tool combination, according to claim 13, wherein the covering portion has a second screw receptacle, that an opening of the second screw receptacle is inserted through the form-fitting element, that the plug attachment has a third screw receptacle, and that an opening of the third screw receptacle is inserted through the form-fitting counter element.

23. The tool combination, according to claim 13, wherein the form-fitting element is designed as a ball attachment and/or that the form-fitting counter element is designed as a bore, in particular as a through hole or a blind hole or as a concave-shaped depression or a depression with straight and inclined surfaces with respect to a center axis of the form-fitting counter element.

24. The tool combination, according to claim 13, wherein the covering portion forms a free surface positioned above the guiding element on its end and that a fourth screw receptacle on the guiding element is arranged immediately behind the free surface, preferably at a distance of less than 50 mm, particularly preferably at a distance of less than 30 mm.

25. The tool combination according to claim 13.

26. A blade tip according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is explained in further detail below on the basis of an embodiment shown in the figures.

[0031] FIG. 1 shows a perspective front view of a cultivator share, having a blade tip and a guiding element;

[0032] FIG. 2 shows the representation according to FIG. 1 in an enlarged side view;

[0033] FIG. 3 shows the blade tip of the cultivator share according to FIG. 1 in an individual representation and in a view from the front;

[0034] FIG. 4 shows the blade tip according to FIG. 3 in a rear view;

[0035] FIG. 5 shows the blade tip mounted on a tine in a laterally enlarged sectional view;

[0036] FIG. 6 shows the connection between the blade tip, a guiding element, and the tine in a laterally further enlarged sectional view;

[0037] FIG. 7 shows a sectional view of the tines with the mounted blade tip and the guiding element in a rear view;

[0038] FIG. 8 shows the blade tip mounted on a tine in a laterally enlarged sectional view with an elongated receptacle;

[0039] FIGS. 9-10 show further form-fitting connections between the blade tip and the guiding element in schematic lateral sectional views;

[0040] FIGS. 11-13 show further form-fitting connections between the blade tip and the guiding element in schematic rear views;

[0041] FIG. 14 shows the blade tip mounted on the tine with a form-fitting connection between the guiding element, the blade tip, and the tine in a laterally enlarged sectional view;

[0042] FIG. 15 shows the form-fitting connection shown in FIG. 14 in a sectional view, transverse to the tool feed direction of the blade tip;

[0043] FIG. 16 shows the blade tip mounted on the tine with a further form-fitting connection between the guiding element, the blade tip, and the tine in a laterally enlarged sectional view; and

[0044] FIG. 17 shows the further form-fitting connection shown in FIG. 16 in a sectional view, transverse to the tool feed direction of the blade tip.

DETAILED DESCRIPTION OF THE INVENTION

[0045] FIG. 1 shows a perspective front view of a cultivator share, having a blade tip 30 and a guiding element 50. The cultivator share can be connected to a tool carrier, in particular, a tine 10 or tine carrier or plow beam or the like of an agricultural soil cultivation machine. For this purpose, the blade tip 30 has a screw receptacle 33 and a second screw receptacle 32, and the guiding element 50 has a fourth screw receptacle 55. The tine 10 has a fastening part 11 which is pierced by fastening bores 12. By means of these fastening bores 12, the tines 10 can be mounted on a device carrier. On the tine 10, two blade wings 20 are furthermore attached laterally to the blade tip 30. The blade wings 20 have a transverse carrier 21 to which lateral cutting elements 22, consisting of a hard material, are attached. Preferably, the lateral cutting elements 22 consist of a hard metal, which is firmly bonded, in particular soldered, to the transverse carrier 21. On the side facing the soil 70 to be cultivated, the blade tip 30 ends into two front cutting elements 40, to which two hard material elements 41 are associated on the side.

[0046] FIG. 2 shows the representation according to FIG. 1 in an enlarged side view. The tine 10 has a carrier part 13 in a region facing away from the fastening part 11. The blade tip 30, the guiding element 50 and the lateral blade wings 20 are mounted on this carrier part 13. One angled portion 23 each, equipped with screw receptacles, is bent away from the transverse carriers 21 of the blade wings 20. By means of mounting screws 14.1, 14.2, which are inserted through the screw receptacles of the angled portion 23 as well as through the screw receptacles of the carrier part 13, the blade wings 20 can be attached to the carrier part 13 of the tine 10. Installed above the blade tip 30 is the guiding element 50 with an upper fastening screw 15, which is inserted through the fourth screw receptacle 55 of the guiding element 50 and a corresponding bore in the tine 10, as well with an associated upper screw nut 15.2 with the carrier part 13.

[0047] The cultivator share is pulled through the soil 70 to be cultivated by the agricultural soil cultivation machine along the illustrated tool feed direction V.

[0048] As can be seen in FIGS. 1 and 2, the guiding element 50 is formed by a flat-shaped or forged steel component. It is bent so as to form a helical deflecting surface. In some cases, straight deflecting surfaces are used as well. On this deflection surface, hard material elements, not illustrated, can be applied in the form of a deposit weld.

[0049] The front cutting elements 40 are firmly bonded to a cutter carrier 37 of the blade tip 30, for example, by soldering.

[0050] The blade tip 30 is located above the guiding element 50 with its end opposite of the front cutting elements 40 and forms a free surface 65 on its end face. By means of this free surface 65, passing soil is directed away from the fourth screw receptacle 55. A top screw head 15.1 of the upper fastening screw 15, which is held countersunk in the fourth screw receptacle 55 and is shown in FIGS. 3 and 4, is protected against the abrasive wear due to the soil. In order to be able to perform this function reliably, the height of the free surface 65 should be at least 8 mm. An optimum wear-protection effect is achieved with an overlap ≧12 mm.

[0051] FIG. 3 shows the blade tip 30 of the cultivator share according to FIG. 1 in an individual representation and in a view from the front. As shown in the drawings, the blade tip 30 has a base part 31, which is penetrated by the screw receptacle 33. Arranged above the screw receptacle 33 is a labeling field 31.1, adjacent to which is the second screw receptacle 32. A projection 34.1 is provided below the screw receptacle 33 that extends in the form of a deflector over a front-side deflecting surface 34 of the base part 31. In this manner, the projection 34.1 forms a skirt that protects a screw head arranged in the screw receptacle 33 against the abrasive attack by the passing soil. In front of the projection 34.1 in the tool feed direction V, the base part 31 has attachments 35 that project over the deflecting surface 34. In the present exemplary embodiment, the attachments 35 are rib-shaped and oriented transversely with respect to the tool feed direction V. Depressions 36 are formed between the individual attachments 35. During use of the tool, the soil may compress and settle into the region of the depressions 36. This forms a kind of natural wear protection on the deflecting surface 34.

[0052] In front of the attachments 35 in the tool feed direction V, the front cutting elements 40 are attached in the form of hard metal elements, which form a cutter 40.3 as the front edge of the blade tip 30. Behind the cutting elements 40 in the tool feed direction V, the hard material elements 41 are applied on the edge regions of the base part 31, which are subjected to particularly high wear. In the present case, hard metal plates are soldered to the base portion 31 as the hard material elements 41. However, it is also conceivable to use an armor welding or the like.

[0053] On the end face opposite the cutting elements 40, the blade tip 30 terminates in the free surface 65.

[0054] FIG. 4 shows the blade tip 30 according to FIG. 3 in a rear view. At the lower end of the blade tip 30, the cutter 40.3 of the front cutting elements 40 extends over the cutter carrier 37 as the lower region of the blade tip 30. In the region above the cutter carrier 37 projections 38 are molded onto the base part 31. The projections 38 are formed rib-like and arranged in the region of the longitudinal edges of the base part 31. The projections 38 are arranged spaced apart from each other so that a depression 38.1 is formed between the projections 38. On the end of the projections 38 facing away from the cutter carrier 37, in the region of the depression 38.1, an opening of the screw receptacle 33 is arranged, which is designed as a first screw lock 38.1. The first screw lock 33.1 has a shape that differs from a round cross-section so that an inserted lower fastening screw 17, shown in FIG. 5, can be secured against turning in the first screw lock 33.1 by a molded-on second locking attachment 17.3. In the illustrated embodiment, the first screw lock 33.1 has an at least approximately rectangular shape with the corners being rounded and the side surfaces being formed concavely inward. The second locking attachment 17.3, which is arranged below a lower screw head 17.1 of the lower fastening screw 17, shown in FIG. 5, has an outer contour corresponding thereto, so that it is held in the first screw lock 33.1 with a predetermined clearance.

[0055] As FIG. 4 further shows, the blade tip 30 has a receptacle 60 on the end facing away from the cutter carrier 37. The receptacle 60 is pocket-shaped and molded into the back side of the blade tip 30. It has a covering portion 61. On the side, insertion chamfers 62.1 adjoin the covering portion 61. The insertion chamfers 62.1 are placed in a V-shape with respect to each other, with an opening angle 62.4, which is 60° in the present exemplary embodiment. In the region below the insertion chamfers 62.1, blocking pieces 62.2 are arranged spaced apart. The two blocking pieces 62.2 are integrally connected to each other via a connecting piece 62.3 of the receptacle 60. The insertion chamfers 62.1, the blocking pieces 62.2, and the connecting piece 62.3 form side walls 62 of the receptacle 60, which rise from the covering portion 61. On the front face, the receptacle 60 is opened by a receptacle opening 63. A release groove 62.5 is provided in the covering portion 61 along the insertion chamfers 62.1, the blocking pieces 62.2, and the connecting piece 62.3. The release groove 62.5 forms a rounded transition from the covering portion 61 to the side walls 62, reducing tension peaks applied by external forces, compared to a sharp edging. The release groove 62.5 also serves to receive a burr, as may be present for manufacturing reasons at the edges on a plug projection 51 of the guiding element 50, held in the receptacle 60 and shown in FIGS. 5, 6, and 7.

[0056] Between the blocking pieces 62.2, a first form-fitting element 64.1 is molded on in the form of a spherical attachment on the covering portion 61, otherwise formed as a flat surface. The first form-fitting element 64.1 projects into the receptacle 60. In order to obtain a compact design with at the same time sufficient mechanical resistance of the connection between the blade tip 30 and the guiding element 50, in particular, with respect to forces along the insertion direction of the guiding element 50 into the receptacle 60, the diameter of the at least one first form locking element 64.1, designed as a ball attachment or as a ball receptacle, at the transition into the covering portion 61 is in a range between 10 mm and 40 mm, preferably in a range between 22 mm and 26 mm, particularly preferably in a range between 23.5 mm and 24.5 mm. An opening of the second screw receptacle 32, shown in FIG. 3, is arranged in the center of the ball attachment, serving as a first form-fitting element 64.1. The opening is designed in the form of a screw lock 66. The screw lock 66 serves to fix a fastening screw 16, inserted in the second screw receptacle 32 an shown in FIGS. 5 and 6, which, as the previously described lower fastening screw 17, has a locking attachment 16.3 is below a screw head 16.1, with the fastening screw 16 in the screw lock 66 being rotationally fixed.

[0057] FIG. 5 shows the blade tip 30 mounted on the tine 10 in the region of the carrier part 13 in a lateral enlarged sectional view.

[0058] The carrier part 13 of the tine has an upper bore 13.1, a central bore 13.2, and a lower bore 13.3 for fastening the guiding element 50 and the blade tip 30. The upper bore 13.1 is arranged flush with the fourth screw receptacle 55, arranged in the guiding element 30, so that the upper fastening screw 15 can be inserted through the screw receptacle 55 and the bore 13.1. The upper screw head 15.1 of the upper fastening screw 15 is designed as a countersunk head and fits into the fourth screw receptacle 55 designed as a countersunk bore such that the surface of the upper screw head 15.1 is arranged flush or recessed with respect to the surface of the guiding element 50. The upper screw head 15.1 is thus protected against abrasive wear caused by the passing soil.

[0059] The plug attachment 51 of the guiding element 50 is inserted into the receptacle 60 of the blade tip 30 through the receptacle opening 63 and is held between the covering portion 61 and the carrier part 13 of the tine 10. Here the plug attachment 51 has a first form-fitting counter element 57.1, into which the first form-fitting element 64.1 of the blade tip 30 engages. The fastening screw 16 is inserted centrally through the first form-fitting element 64.1 and the first form-fitting counter element 57.1 as well as through the central bore 13.2 of the carrier part 13, which is flush therewith, and is held on the back side of the carrier part 13 by a screw nut 16.2. It thus connects the blade tip 30 and the guiding element 50 with the carrier part 13. The screw head 16.1 of the fastening screw 16 is arranged countersunk in second screw receptacle 32, designed as a blind hole. The soil guided over the deflecting surface 34 thus does not scrape directly over the screw head 16.1, so that it is protected against abrasive wear.

[0060] The lower bore 13.3 of the carrier part 13 is arranged flush with the screw receptacle 33 of the blade tip 30. The lower fastening screw 17 is inserted through the screw receptacle 33 and the bore 13.3 and bolted on the back side of the carrier part 13 with a lower screw nut 17.2. The lower screw head 17.1 of the lower fastening screw 17 is held countersunk in the screw receptacle 33 so that it is protected against abrasive wear as well.

[0061] The cutting elements 40 in the form of hard metal elements are fastened to the cutter carrier 37. The cutting elements 40 have a flat-shaped mounting portion 40.1 and an attachment piece 40.2, integrally molded thereon and projecting against the tool feed direction V. The cutter 40.3 is formed in the region of the attachment piece 40.2. The cutting elements 40 are attached to the cutter carrier 37 such that the free terminating edge of the cutter carrier 37 is at least partially surrounded by the attachment pieces 40 of the cutting elements 40.2. In this manner, the free end of the cutter carrier 37 is protected against wear.

[0062] FIG. 6 shows the connection between the blade tip 30, the guiding element 50, and the tine 10 in the region of the second screw receptacle 32 in a laterally further enlarged sectional view.

[0063] The first form-fitting element 64.1, designed as a ball attachment, engages with the first form-fitting counter element 57.1 of the guiding element 50. The ball attachment is centered by means of the inclined surfaces of the first form-fitting counter element 57.1 such that the second screw receptacle 32 and a third screw receptacle 56, arranged in the center of the first form-fitting counter element 57.1, are aligned flush with one another.

[0064] The fastening screw 16, pulls together the blade tip 30, the guiding element 15, and the carrier part 13 of the tine 10. As a result, the blade tip 30 and the guiding element 15 are form-fittingly connected with each other by the first form-fitting element 64.1 and the first form-fitting counter element 57.1.

[0065] The fastening screw 16 with its locking attachment 16.3 is secured against rotation in the screw lock 66 of the second screw receptacle 32. The screw nut 16.2 may thus be screwed and tightened onto the fastening screw 16 without needing to apply a tool in a corresponding tool receptacle on the screw head 16.1. The screw lock 66 is arranged in the first form-fitting element 64.1. By means of the first form-fitting element 64.1 projecting into the receptacle 60, the support of the screw head 16.1 can be provided more deeply in the second screw receptacle 32 than in the case of a covering portion 61 that is continuously planar on the side of the receptacle 60. The screw head 16.1 is thus more deeply countersunk in the second screw receptacle 32 and thus better protected against abrasion.

[0066] FIG. 7 shows a sectional view of the tine 10 with the mounted blade tip 30 and the guiding element 50 in a rear view.

[0067] The plug attachment 51 has two guide surfaces 54 which are set in a V-shape at an angle to each other. They transition into the side parts 52. The side parts 52 are arranged in the region of an end 53 of the plug attachment 51.

[0068] For mounting the blade tip 30, it is pushed onto the plug attachment 51 of the guiding element 50 with its receptacle 60. As can be seen in FIG. 7, the plug attachment 51 of the guiding element 50 can be threaded in at the insertion chamfers 62.1 during this joining movement to enable targeted mounting. After the plug attachment 51 has passed the insertion chamfers 62.1, the end 53 of the plug attachment 51 glides between the two blocking pieces 62.2. The dimensional relationship is selected such that the blocking pieces 62.2 are laterally assigned to the side parts 52. As a result, the blade tip 30 can be fixed flush to the blocking pieces 62.2, transversely to the tool feed direction V, taking into account a minimum, technically required clearance. To ensure a defined fit, the connecting piece 62.3 and the end 53 of the plug attachment 51 are then spaced apart. Furthermore, the insertion chamfers 62.1 are also arranged at a small distance from the guiding chamfers 54. At the same time, the first form-fitting element 64.1 engages with the first form-fitting counter element 57.1, as shown in FIGS. 5 and 6.

[0069] After the blade tip 30 with its receptacle 60 has been fixed on the plug attachment 51 of the guiding element 50 and the first form-fitting element 64.1 engages with the first form-fitting counter element 57.1, the screw receptacles 32, 33 of the blade tip 30 are flush with the center or lower bore 13.2, 13.3 of the tine 10. Furthermore, the second screw receptacle 32 is aligned flush with the third screw receptacle 56 of the guiding element 50. The fastening screws 16, 17 can now be inserted through the screw receptacles (32, 33, 56) and holes (13.2, 13.3), aligned flush to one another, and the blade tip 30 can be fixed to the tine 10. The non-rotatable assignment of the blade tip 30 to the tine 10 is ensured by means of the form-fitting blockage between the plug attachment 51 and the receptacle 60.

[0070] FIG. 8 shows the blade tip 30 mounted on the tine 10 in a lateral enlarged sectional view with an elongated receptacle 60. The covering portion 61 and the side walls 62, not shown, of the receptacle 60 here are elongated far enough in the direction of the guiding element 50 so that the upper bore 13.1 is covered. The first form-fitting element 64.1 and the first form-fitting counter element 57.1 are now arranged opposite to the upper bore 13.1 and penetrated by the upper fastening screw 15. To this end, the upper fastening screw 15 with its upper screw head 15.1 is held in the second screw receptacle 32, which is opposite the upper bore 13.1 due to the elongated covering portion 61. A form-fitting connection is thus formed between the first form-fitting element 64.1 and the first form-fitting counter element 57.1, as described with reference to FIG. 6. The upper fastening screw 15 is protected against abrasive wear by its countersunk position in the second screw receptacle 32.

[0071] Additionally, opposite the center hole 13.2 a second form-fitting element 64.2 is provided on the covering portion 61 and a second form-fitting counter element 57.2 is provided on the plug attachment 51 of the guiding element 50. The second form-fitting element 64.2 here is designed as a ball attachment, corresponding to the first form-fitting element 64.1, which engages with the second form-fitting counter element 57.2. The second form-fitting counter element 57.2 is designed as a circular opening of the plug attachment 51 with inclined surfaces, so that the ball attachment is centered therein during assembly. Due to the thus formed second form-fitting connection, the center screw connection and the fastening screw 16 with the associated screw nut 16.2 can be omitted.

[0072] FIGS. 9-10 show further possible form-fitting connections between the blade tip 30 and the guiding element 50 in schematic lateral sectional views. In this case, the form-fitting connection is established between the covering portion 61 and the plug attachment 51. For simplified illustration, screw connections and the carrier part 13 of the tine 10 are not shown.

[0073] In FIG. 9, the covering portion 61 has three third form-fitting elements 64.3 in the form of rib-shaped attachments with a rectangular profile, which extend transversely with respect to the blade tip 30. These engage with three groove-shaped receptacles, which are aligned transversely to the longitudinal extension of the plug attachment 51 and form third form-fitting counter elements 57.3. The guiding element 51 and the blade tip 30 are thus fixed relative to one another by means of the form-fitting connection between the third form-fitting elements 64.3 and the third form-fitting counter elements 57.3.

[0074] In FIG. 10, the covering portion 61 has three fourth form-fitting elements 64.4 in the form of ball sections arranged along the central longitudinal axis of the blade tip 30. The fourth form-fitting elements 64.4 engage with the fourth form-fitting counter elements 57.4, which are incorporated into the surface of the plug attachment 51 as concave recesses.

[0075] FIGS. 11 to 13 show a further form-fitting connection between the blade tip 30 and the guiding element 50 in schematic rear views.

[0076] In FIG. 11, fifth form-fitting elements are formed as recesses 64.5 in the side walls 62 of the receptacle 60. Correspondingly formed fifth form-fitting counter elements 57.5 engage with this recess. At the end, the plug attachment 51 has a widened region, which accordingly engages with a widened region of the receptacle 60.

[0077] In FIG. 12, the form-fitting connection between the blade tip 30 and the plug attachment 51 of the guiding element 50 is formed by a region of the plug attachment 51, which is widened relative to the width of the receptacle opening 63, and a correspondingly widened region of the receptacle 60. The widened region of the receptacle 60 forms the sixth form-fitting element 64.7 and the widened region of the plug attachment 51 forms the sixth form-fitting counter element 64.6.

[0078] According to FIG. 13, a seventh form-fitting counter element 57.7 is formed as a region of the plug attachment 51, which is widened in a star-shaped manner relative to the receptacle opening 63 and which is inserted into a correspondingly shaped seventh form-fitting element 64.7.

[0079] For mounting, the guiding element 50 and the blade tip 30, the blade tip 30 with its receptacle 60 is pushed onto the plug attachment 51 of the guiding element 50 in the various variants of the form-fitting connections. Here, the plug attachment 51 is inserted through the receptacle opening 63 of the receptacle 60 and the form-fitting elements 64.1, 64.2, 64.3, 64.4, 64.5, 64.6, 64.7, 19, 58 and the associated form-fitting counter elements 57.1, 57.2, 57.3, 57.4, 57.5, 57.6, 57.7 57.8, 18, 39 engage with one another. In this position, the blade tip 30 and the guiding element 50 are bolted with the tine 10. The form-fitting connections thereby reliably prevent the guiding element 50 and the blade tip 30 from being pulled apart along the direction of their longitudinal extension.

[0080] FIG. 14 shows the blade tip 30 mounted on the tine 10 with a form-fitting connection between the guiding element 50, the blade tip 30, and the tine 10 in a lateral enlarged sectional view.

[0081] A first form-fitting connection is formed between the receptacle 60 and the plug attachment 51 in the form of the first form-fitting element 64.1, designed as a spherical surface and already described in FIG. 5, which engages with the first form-fitting counter element 57.1 in the plug attachment 51. The first form-fitting element 64.1 is pressed into the first form-fitting counter element 57.1 by the lower fastening screw 17. The screw head 16.1 of the fastening screw 16 is countersunk and held covered in the plug connection 51 of the guiding element 50 by means of the covering portion 61 of the receptacle 60. Between the fastening screw 16 and the receptacle opening 63 of the receptacle 60, a tenth form-fitting element 57.8 is formed on the plug attachment 51 in the form of a trunnion. The trunnion here protrudes out of the plane of the plug attachment 51 both in the direction of the covering portion 61 as well as opposite in the direction of the carrier part 13 of the tine 10. The tenth form-fitting element 57.8 thereby engages with an eighth form-fitting counter element 39, formed as a recess in the covering portion 61, as well as into a ninth form closure element 18, formed as a recess into the carrier part 13. Thus, the eighth form-fitting element 58 forms a form-fitting connection from the guiding element 50 in the direction of both the blade tip 30 and the tine 10.

[0082] FIG. 15 shows the form-fitting connection of the blade tip 30, shown in FIG. 14 in a sectional view, transverse to the tool feed direction V, along the intersecting line marked with XV in FIG. 14.

[0083] The trunnion of the eighth form-fitting element 58, which is molded on both sides on the plug attachment 51, engages with the recesses of the eighth form-fitting element 39 at the covering portion 61 of the receptacle 60 and with the ninth form-fitting element 19 at the carrier part 13 of the tine 10. Thus, a form-fitting connection between the guiding element 50, the tine 10, and the blade tip 30 is formed, both transversely and longitudinally with respect to the longitudinal extension of the tool combination.

[0084] FIG. 16 shows the blade tip 30 mounted on the tine 10 with another form-fitting connection between the guiding element 50, the blade tip 30, and the tine 10 in a lateral enlarged sectional view. The representation substantially corresponds to the representation shown in FIG. 14. Unlike in the above, the carrier part 13 of the tine 10 has a ninth form-fitting element 19, which is designed as a trunnion oriented in the direction towards the plug attachment 51 of the guiding element 50 and towards the covering portion 61 of the receptacle 60 of the blade tip 30. The ninth form-fitting element 19 engages with a tenth form-fitting counter element 57.8, designed as an opening in the plug attachment 51, and with an eight form-fitting counter element 39, designed as a recess or opening in the covering portion 61. Here, too, a form-fitting connection is established between the blade tip 30, the tine 10, and the guiding element 50. Of course, the form-fitting element 19 may also be molded or attached to the blade tip 30 instead. It then engages with the opening, formed as the tenth form-fitting element 57.8, and the form-fitting counter element of the tine 10, formed as a recess or opening.

[0085] FIG. 17 shows the further form-fitting connection of the blade tip 30, shown in FIG. 16 in a sectional view, transverse to the tool feed direction V, along the intersecting line marked with XVII in FIG. 16. The ninth form-fitting counter element 19, designed as a trunnion, is integrally connected to the carrier part 13 of the tine 10. It protrudes into the tenth form-fitting counter element 57.8, designed as an opening, of the plug attachment 51 and into the eighth form-fitting counter element 39, designed as a recess in the covering portion 61 of the receptacle 60.

[0086] By means of continuous form-fitting connections, shown in FIGS. 14 to 17, the tine 10, the guiding element 50, and the blade tip 30 are connected to one another in a form-fitting manner, and thus resiliently. At the same time, the continuous form-fitting connection is achieved by the fact that the components are accurately aligned with each other, facilitating mounting of the tool combination.