WEAR PROTECTION DEVICE FOR MOWING DISCS FOR ROTARY MOWERS

Abstract

A mowing disc for rotary mowers is provided, which has a mowing plate with a central drive region and an upper casing surface. The mowing plate is equipped with mower blades at its periphery. The mowing disc further includes a wear protection device consists of a single-component or multi-component protective cover which can be fastened on the upper casing surface.

Claims

1. A wear protection device for a mowing disc for a rotary mower, wherein the mowing disc has a mowing plate with a central drive region and an upper casing surface, wherein the mowing plate is equipped with mower blades at its periphery, and wherein the mowing plate has a recess for receiving and protecting a screwing head of bearing pin for a respective mower blade, the recess provided in a region for mounting the respective mower blade, CHARACTERIZED IN THAT: the wear protection device is formed by a single-component or multi-component protective cover which is fastened on the upper casing surface, wherein the protective cover is constructed so that it follows the contour of the upper casing surface and is adjacent to it at least in some sections.

2. The wear protection device according to claim 1, wherein: the protective cover is fastened to the central drive region of the mowing plate.

3. The wear protection device according to claim 1, wherein: the protective cover is removably fastened to the central drive region of the mowing plate.

4. The wear protection device according to claim 2, wherein: the protective cover is fastened to the mowing plate by means of the bearing pin.

5. The wear protection device according to claim 2, wherein: the protective cover is formed by at least two protective cover parts which extend from the central drive region towards the region for mounting the respective mower blade and surround the end face of the mowing plate at the periphery with a downwardly beaded edge zone.

6. The wear protection device according to claim 1, wherein: the surface of the protective cover is hardened and/or provided with one full-surface or multiple partial wear protection zones.

7. The wear protection device according to claim 1, wherein: at least one material guide element projects from the surface of the protective cover.

8. The wear protection device according to claim 7, wherein: the material guide element is screwed to the mowing plate using the bearing pin and surmounts the screwing head of the bearing pin for protection.

9. The wear protection device according to claim 7, wherein: the material guide element has latching webs which latch into latching grooves of the protective cover.

10. The wear protection device according to claim 1, wherein: the protective cover is formed of steel.

11. The wear protection device according to claim 1, wherein: the protective cover comprises a plurality of protective cover parts each associated with a corresponding mower blade.

12. The wear protection device according to claim 1, wherein: the protective cover comprises a plurality of protective cover parts each associated with one or multiple mower blades.

13. A mowing disc for a rotary mower, comprising: a mowing plate with a central drive region and an upper casing surface, wherein the mowing plate is equipped with mower blades at its periphery, and wherein the mowing plate has a recess for receiving and protecting a screwing head of bearing pin for a respective mower blade, the recess provided in a region for mounting the respective mower blade; and a wear protection device is formed by a single-component or multi-component protective cover which is fastened on the upper casing surface, wherein the protective cover is constructed so that it follows the contour of the casing surface and is adjacent to it at least in some sections.

14. The mowing disc according to claim 13, wherein: the protective cover is fastened to the central drive region of the mowing plate.

15. The mowing disc according to claim 13, wherein: the protective cover is removably fastened to the central drive region of the mowing plate.

16. The mowing disc according to claim 14, wherein: the protective cover is fastened to the mowing plate by means of the bearing pin.

17. The mowing disc according to claim 14, wherein: the protective cover is formed by at least two protective cover parts which extend from the central drive region towards the region for mounting the respective mower blade and surround the end face of the mowing plate at the periphery with a downwardly beaded edge zone.

18. The mowing disc according to claim 13, wherein: the surface of the protective cover is hardened and/or provided with one full-surface or multiple partial wear protection zones.

19. The mowing disc according to claim 13, wherein: at least one material guide element projects from the surface of the protective cover.

20. The mowing disc according to claim 19, wherein: the material guide element is screwed to the mowing plate using the bearing pin and surmounts the screwing head of the bearing pin for protection; and/or the material guide element has latching webs which latch into latching grooves of the protective cover.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the following, the invention is described by way of example with reference to exemplary embodiments according to the figures.

[0024] FIG. 1 shows a plan view of a first example of a mowing disc, wherein a protective cover part according to the invention is screwed on the right half.

[0025] FIG. 2 shows a section along line II-II in FIG. 1.

[0026] FIG. 3 shows the diagonal view of the protective cover part according to FIG. 1 or 2.

[0027] FIG. 4 is an enlarged view of the right edge region of the mowing disc in FIG. 2.

[0028] FIGS. 5 and 6 show two alternative embodiments of the mowing discs according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] The mowing disc according to FIG. 1 has an elongated shape in this embodiment, wherein the longitudinal extension in the direction of the section line II-II is longer than the transversal one. FIG. 1 shows the completely mounted state on the right half, whereas the left half is only partially mounted.

[0030] The mowing disc comprises the mowing plate 1, the surface of which is referred to as upper casing surface 2. The central drive region 3 of the mowing plate 1 is attached to the plate hub (not shown here), wherein the connection is made with screws through the screw holes 4. For the mowing operation, the mowing disc is set into fast rotation about the rotation axis 5. The mowing plate 1 is preferably pressed of sheet steel. Through presser edges 6, an increased strength of the mowing plate 1 and its downwardly open bowl shape are obtained. In the region of mounting 7 of the mower blades 15, the mowing plate 1 has a recess 8 for receiving and protecting the screwing head 11 of the bearing pin 9, which is received in the opening 24. The protection of the bearing pin 9 and in particular of its screwing head 11 is provided by the remaining projections 10 of the recess 8.

[0031] The protective cover 12 provided according to the invention is arranged in the right part of the mowing disc and fastened with its fastening region 13 to the central drive region 3 of the mowing plate 1, preferably removably fastened by means of screws. FIGS. 1 and 2 show respectively a protective cover part 12 on the right. After the assembling of the mowing disc, the protective cover 12 is completed with a same-looking part of the protective cover 12 on the left side.

[0032] The protective cover 12 substantially follows the contour of the upper casing surface 2 and is adjacent to it at least in some sections. In the region of mounting 7 of the mower blades 15, the bearing pin 9 may be directly arranged on the mowing plate 1 for screwing the mower blades 15, wherein a bearing sleeve 16 is provided for ensuring the slight pivotability of the mower blade 15. As a result, both mower blades 15 are not rigidly connected to the mowing plate 1, but are pressed outwards by the centrifugal forces.

[0033] The material guide element 17 shown in FIGS. 1 and 2 may have an additional guiding and conveying function for the mowed material, although that is only an optional embodiment variant. FIG. 2 shows this arrangement with a material guide element 17 in the right section, this material guide element 17 also having a pot-shaped recess 18 for receiving and laterally protecting the screwing head 11 of the bearing pin 9. The mounting 7 of the mower blades 15 without material guide element 17 is analogous to the form shown in the right section of FIGS. 1 and 2, wherein, since the material guide element 17 is not present, the bearing pin 9 can be slightly shorter.

[0034] FIG. 3 shows one of the protective cover parts 12 in a diagonal view, the material guide element 17 being attached to it in the protective region 14. The material guide element 17 is screwed to the mowing plate 1 using the bearing pin 9 (not shown here), wherein the screwing head 11 is protected by the upwardly projecting sections of the pot-shaped recess 18. A form-fitting connection between the material guide element 17 and the protective cover 12 is achieved in that the material guide element 17 has downwardly directed latching webs 19 which latch into latching grooves 23, which are aligned with the latching webs 19, of the protective region 14 of the protective cover 12.

[0035] The surface of the protective region 14 of the protective cover 12 is preferably hardened and/or may be provided with one full-surface or, according to FIG. 3, with multiple partial wear protection zones 20. The position and design of the wear protection zones 20 can be adapted to the respective wear exposure. In particular, the downwardly beaded edge zone 21 in the protective region 14 of the protective cover 12, which is highly exposed to wear, may be protected against wear with an even more wear resistant partial wear protection zone 20a. The impairment of the material properties of the protective cover 12, which may occur due to the production of the wear protection zones 20, can be ignored, since the high tensile and impact forces of the mower blades 15 are only to be absorbed by the mowing plate 1, whereas the protective cover 12 is not affected by these forces.

[0036] FIG. 4 is a slightly enlarged view of the region of mounting 7 of the mower blades 15 having the material guide element 17 arranged. In the protective region 14, the protective cover 12 has a downwardly beaded edge zone 21 which surrounds the end face 22 of the mowing plate 1.

[0037] FIG. 5 schematically shows the plan view of a mowing disc in a triangular shape with three mower blades 15 and three associated protective cover parts 12. The design of the protective cover parts 12 and their fastening to the mowing plate 1 are similar to the design according to FIGS. 1 to 4. Each protective cover part 12 is attached to the central drive region 3 of the mowing plate 1 both by its own bearing pin 9 and by screwing in the fastening region 13 through the screw holes 4.

[0038] Similar to the previous exemplary embodiments, material guide elements 17 may also be arranged in the region of mounting 7 of the mower blades 15. Furthermore, this triangular embodiment of the mowing disc with respective wear protection zones 20 may be provided as shown in FIG. 3. The position of the wear protection zones 20 obviously needs to be adapted to the wear exposure of the mowing disc.

[0039] FIG. 6 shows an exemplary embodiment for a circular mowing disc, wherein each protective cover part 12 is attached to the central drive region 3 of the mowing plate 1 with the bearing pin 9 of two mower blades 15 and, additionally, by screwing through the screw holes 4.

[0040] In the embodiments shown in FIGS. 5 and 6 it is also possible to fit given mowing discs with the protective covers 12 during initial assembly or retrofit them, in order to make them more wear resistant. The protective cover parts 12 can also be replaced without a lot of disassembling work.

[0041] FIGS. 5 and 6 show that the wear protection device can be adapted to any shape of the mowing discs.

[0042] There have been described and illustrated herein several embodiments of a mowing disc for a rotary mower a method of manufacturing the same. While particular embodiments of the invention have been described, it is not intended that the invention be limited thereto, as it is intended that the invention be as broad in scope as the art will allow and that the specification be read likewise. It will therefore be appreciated by those skilled in the art that modifications could be made to the provided invention without deviating from its spirit and scope as claimed.

LIST OF REFERENCE SIGNS

[0043] 1 Mowing plate [0044] 2 Upper casing surface [0045] 3 Central drive region [0046] 4 Screw hole [0047] 5 Rotation axis [0048] 6 Presser edge [0049] 7 Mounting [0050] 8 Recess [0051] 9 Bearing pin [0052] 10 Projection [0053] 11 Screwing head [0054] 12 Protective cover or protective cover part [0055] 13 Fastening region [0056] 14 Protective region [0057] 15 Mower blade [0058] 16 Bearing sleeve [0059] 17 Material guide element [0060] 18 Pot-shaped recess [0061] 19 Latching web [0062] 20, 20a Wear protection zone [0063] 21 Edge zone [0064] 22 End face [0065] 23 Latching groove [0066] 24 Opening