BLADE ROTOR OF A CUTTER BAR FOR A MOWING DEVICE

Abstract

A clamping tool for exchanging a mowing blade on a blade rotor, the clamping tool including a lever arm with a fork head, wherein the fork head has two fork legs that are parallel to each other at a distance and have a bent shape such that, with respect to a horizontally oriented lever arm, the fork legs have an arc-shaped construction with fork leg ends pointing essentially in the vertical direction, wherein the clamping tool can be clamped between a mowing disc and a spring plate of a blade rotor and can be brought into engagement with a pocket on a top side of the mowing disc, and the fork leg ends are pressed against the bottom side of the mowing disc by a downward movement of the lever arm, and the fork legs press the spring plate downward.

Claims

1. A clamping tool for exchanging a mowing blade on a blade rotor, comprising: a lever arm with a fork head, wherein the fork head has two fork legs that are parallel to each other at a distance and have a bent shape such that, with respect to a horizontally oriented lever arm, the fork legs have an arc-shaped construction with fork leg ends pointing essentially in the vertical direction, wherein the clamping tool can be clamped between a mowing disc and a spring plate of a blade rotor and can be brought into engagement with a pocket on a top side of the mowing disc, and the fork leg ends are pressed against the bottom side of the mowing disc by a downward movement of the lever arm, and the fork legs press the spring plate downward.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Shown are:

[0015] FIG. 1, a schematic plan view of an agricultural vehicle with a mowing device,

[0016] FIG. 2, a perspective top-side view of a cutter bar with blade rotor of the mowing device from FIG. 1,

[0017] FIG. 3, a perspective side view of a part of the cutter bar with blade rotors from FIG. 2,

[0018] FIG. 4, a partial exploded view of the side view of the cutter bar with blade rotors from FIG. 3,

[0019] FIG. 5, a bottom-side perspective view of a scraper from FIG. 4,

[0020] FIG. 6, a top-side, perspective view of the scraper from FIGS. 4 and 5, and

[0021] FIG. 7, a perspective side view of a part of the cutter bar with blade rotors from FIG. 2 and a mounted clamping tool for changing the mowing blade.

DETAILED DESCRIPTION

[0022] The agricultural vehicle 10 shown in FIG. 1 is a self-propelled mowing machine with mowing devices 12 in the form of a front mowing tool 14 and side rear mowing tools 16. The vehicle 10 constructed here as a self-propelled unit, however, is used only as an example and could also be constructed as an agricultural tractor and could be equipped with mowing devices 12 constructed accordingly as attachments or trailing units.

[0023] As shown in more detail in FIGS. 2 to 4, a mowing device 12 includes a cutter bar 18 with multiple blade rotors 20 mounted on this cutter bar and driven to rotate (only one is shown here).

[0024] The blade rotor 20 includes a mowing disc 22 with mowing blades 24 mounted on this disc so that they can pivot. The mowing disc 22 has an oval shape in this embodiment, wherein the mowing blades 24 are arranged on the long ends of the oval. The blade rotor 20 constructed in this embodiment with a mowing disc 22 could also be constructed in a known way with a drum or plate shape (cutting drum, cutting plate). It should be noted that, in FIGS. 2 to 4, the upward pointing side of the mowing disc 22 is the side on the mowing device 12 pointing away from the ground to be worked. It is also a side of the mowing disc 22 accessible to the operator for installation purposes. In the description below, this side is designated as the top side of the mowing disc 22 and the opposite side of the mowing disc 22 is designated as the bottom side.

[0025] The mowing blades 24 are suspended or supported on the mowing discs 22 so that they can pivot by means of a mounting hole 26 constructed on the mowing disc 22 and a beating pin 28 attached thereto. The mounting hole 26 is formed on a wear protection device 30 constructed on the mowing disc 22 for protecting the bearing pin 28 or for protecting the mounting hole 26 and for mounting the bearing pin 28 on the mowing disc.

[0026] For holding and quickly installing a mowing blade 24, on the bottom side of the mowing disc 22 there is a spring plate 32 that extends starting from the middle of the mowing disc 22 to the ends of the mowing disc 22. At the end areas of the spring plate 32 there is a holding hole 34 that is in engagement with the bearing pin 28 such that one end 36 of the bearing pin 28 is held or clamped in the holding hole 34.

[0027] The bearing pin 28 includes a threaded shaft 38 and a holding shaft 40 adjacent to this threaded shaft. With a screw nut 42, the bearing pin 28 is mounted on its threaded shaft 38 on the mounting hole. Furthermore, the bearing pin 28 includes a bearing shaft 44 adjacent to the holding shaft 40 for the mowing blade 24. The diameter at the end 36 of the bearing pin 28 is dimensioned such that the end 36 can be introduced into the holding hole 34. The diameter of the holding hole 34 on the spring plate 32 is dimensioned such that the spring plate at the edge of the holding hole 34 can come into contact with a section at the end 36 of the bearing pin.

[0028] The mowing blade 24 has, on an end opposite a mowing blade edge 54, a bearing hole 56 whose diameter is dimensioned such that it can be guided over the bearing shaft 44 of the bearing pin 28.

[0029] As is to be seen in FIGS. 3 and 4, the wear protection device 30 has a U-shaped collar 58 with a collar shaft 60 that projects beyond the screw nut 42 and encloses this screw nut for the most part, wherein the U-shaped collar 58 is open on one side. On the top side of the mowing disc 22 there is, in the area of the mounting hole 26, a pocket 62 surrounding the mounting hole 26.

[0030] Furthermore, a holding bead 66 surrounding the holding hole 34 and extending in the direction of the mowing blade 24 or the mowing disc 22 is formed on the spring plate 32. The holding bead 66 is formed such that the mowing blade 24 can form a contact on its bottom side on an edge area surrounding the bearing hole 56 on the holding bead 66, so that the mowing blade 24 is held at the height of the bearing shaft 44.

[0031] According to all of these arrangements, an installation of the bearing pin 28 on the mowing disc 22 for the pivoting support of the mowing blade 24 is realized as follows: the bearing pin 28 is guided, with its threaded area 38 at the front, out from the bottom side of the mowing disc 22 through the mounting hole 26 and fixed by means of the screw nut 42. The end 36 of the bearing pin 36 is moved into the holding hole 34 of the spring plate 32, wherein the mowing blade 24 has already been guided onto the bearing shaft 44. When the bearing pin 28 is mounted, this now projects into the holding hole 34 of the spring plate 32, whereby the end 36 of the bearing pin 28 is blocked and the mowing blade is enclosed between the spring plate 32 and holding shaft 40. The bearing pin 28 is now mounted on the mowing disc 22 such that the bearing shaft 44 extends, starting from the mounting hole 26, in the direction of the bottom side of the mowing disc 22 and projects with its end 36 into the holding hole 34 of the spring plate 32. The mowing blade 24 is here held by the holding bead 66 on the spring plate 32 at the height of the bearing shaft 44. When the blade rotor 20 is started up, the mowing blade 24 can move unimpaired into the complete bearing seat due to the resulting centrifugal forces and can pivot about the bearing shaft 44. A pivoting support of the mowing blade 24 on the bearing shaft 44 is used to allow the mowing blade 24 to perform a certain amount of evasive maneuvers during mowing work if it strikes an obstacle, for example, a stone.

[0032] The cutter bar 18 is further constructed with a rotor flange 68 on which the spring plate 32 and the mowing disc 22 can be mounted, wherein threaded holes 70 are formed on the rotor flange 68 and corresponding mounting holes 72, 74 are formed on the spring plate 32 and mowing disc 22. By means of the threaded bolt 76, the mowing disc 22 and the spring plate 32 are mounted on the rotor flange 68, wherein the spring plate 32 is clamped between the rotor flange 68 and the mowing disc 22. The spring plate 32 is here formed and constructed such that free spring plate ends 78 extend toward the long ends of the oval of the mowing disc 22, wherein the mowing blade 24 is between the spring plate ends 78 and the bottom side of the mowing disc 22 and the spring plate ends 78 exert a spring force acting in the direction of the bottom side of the mowing disc 22.

[0033] Between the free spring plate ends 78 and the mowing disc 22 there is, on both long ends of the oval of the mowing disc 22, a scraper 80 that includes a fastening plate 82 and a scraper finger 83. The scraper 80 is shown in detail in FIGS. 5 and 6. The fastening plate 82 has mounting holes 84 that correspond to mounting holes 86 arranged on the mowing disc 22, wherein the fastening plate 82 is mounted on the mowing disc 22 between the bearing pin 28 and an axis of rotation 88 of the mowing disc 22 by means of screws 90 and screw nuts (not shown). The scraper 80 is constructed such that, for the scraper 80 mounted on the mowing disc 22, the scraper finger 83 is formed by an elongated connecting piece that extends along a spring plate end 78 in its longitudinal direction from the fastening plate 82, essentially parallel to the plane of extent of the fastening plate 82 in the direction of the outside of the mowing disc 22, and projects past the edge of the long end of the oval of the mowing disc 22. Furthermore, the scraper finger 83 extends, starting from a bottom side 92 of the fastening plate 82, in the direction of a top side 94 of the cutter bar 18, so that, on the scraper finger 83 directly above the cutter bar 18, a scraping edge 96 is formed that defines, when the mowing disc 22 rotates, a circular ring surface projected onto the top side 96 of the cutter bar 18. A radial extent of the scraper finger 83 is in the plane of rotation of the mowing disc 22, radial to the axis of rotation 88, wherein the radial direction of the scraper finger is at an angle 97 offset with respect to the mowing blade 24 (measured in the direction of extent of the mowing blade 24 for a rotating mowing disc 22). According to the direction of rotation of the mowing disc 22, the angle 97 is arranged relative to the mowing blade 24 to the left or right side with respect to the mowing blade 24.

[0034] On a top side 98 of the fastening plate 82 there are bulges 100 that extend, in the mounted state of the scraper 80, laterally along a bulge formed on the bottom side of the mowing disc 22 (a bulge extending in the direction of the spring plate 32; not shown) and form an adaptation for the scraper 80.

[0035] On an end 102 of the fastening plate 80 facing the bearing pin 28 there is a curved pocket 104 extending around the bearing pin 28, with a section 106 adjacent to each of the curve ends 105. The sections 106 in connection with the curve ends 105 act as an attachment fit for a clamping tool 108 that can be attached for changing the mowing blade 22, which can be seen in FIG. 7.

[0036] The clamping tool 108 has a lever arm 110 or handle with a fork head 112, wherein two parallel, spaced-apart fork legs 114 are formed on the fork head 112, and these legs can be placed or pushed between the mowing disc 22 and spring plate 32. Simultaneously, the clamping tool 108 can be brought into engagement with the pockets 106 of the scraper. The fork legs 114 of the lever arm 110 are arranged at a distance to each other just like the pockets 106 constructed on the fastening plate 82 or also like the curve ends 105 of the curved pocket 104 are spaced apart from each other. Now if the clamping tool 108 is mounted, that is, if the fork legs 114 are each pushed on one side of the mowing blade 24 between the mowing disc 22 and the spring plate 32, then the pockets 106 can be used, on one hand, as a stop for the fork leg ends 116, and, on the other hand, in connection with the curve ends 105 of the curved pocket 106 as a lateral guide of the fork legs 114 against lateral slippage.

[0037] The fork legs 114 are constructed with a curved shape with respect to a horizontally oriented lever arm 110 with fork leg ends 116 pointing essentially in the vertical direction, so that, when the clamping tool 108 is mounted between the mowing disc 22 and the spring plate 32 of the blade rotor 20 and brought into engagement with the pockets 106, a downward movement of the lever arm 110 presses the fork leg ends 118 against the bottom side of the mowing disc 22, and the fork legs 114 simultaneously press the spring plate 32 downward. The fork legs 114 are, in other words, bent upward with respect to a horizontally oriented lever arm 110, so that when the clamping tool 108 is mounted and the fork legs 114 contact the spring plate 32, as shown in FIG. 7, moving the lever arm 110 down presses the fork leg ends 116 against the bottom side of the mowing disc 22 and simultaneously moves (levers) a fork leg contact surface 118 in the direction of the spring plate 32. In this way, the distance between the mowing disc 22 and spring plate 32 is increased until the mowing blade 24 is released from the bearing pin 28 or from the holding hole 34 constructed on the spring plate 32 and can be replaced.