Rotary grass cutting blade

Abstract

To provide a rotary mowing blade for use in a bush cutter, capable of facilitating post-treatment (moving and bagging work) of weeds after mowing by cutting overgrown weeds, vines, etc., short during mowing work and preventing mutual entanglement of the cut weeds, and further suppressing winding of the weeds around an output shaft of the bush cutter.SOLUTION: A disk-shaped mowing blade body including a large number of substantially uneven mowing blades on a peripheral edge, comprises a large number of tip blade bodies in which downward mowing blades inclined downward and horizontal mowing blades formed horizontally, are alternately formed, provided adjacent to a longitudinal cutting blade formed on the peripheral edge of the mowing blade body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotary grass cutting blade that is attached to the rotating tip of a brush cutter to efficiently cut vines and tall weeds entangled in grass. [Background technology]

[0002] Conventionally, plants such as vines and tall grass spread easily and interfere with agricultural work and other labor when they grow in fields or agricultural soil, so they are cut and removed with brush cutters to clear the land.

[0003] These brush cutters have a disk-shaped grass cutting blade that is rotatably attached to an output shaft of a drive source such as an engine, and cut weeds, vines, and the like.

[0004] Such a grass cutting blade has a blade portion protruding from the periphery of a disk-shaped metal grass cutting blade body, and when rotated, the cutting blade body attached to the edge of the blade cuts vines and tall weeds.

[0005] However, when using a brush cutter to cut weeds in areas overgrown with tall weeds or vines, the length of the cut weeds increases by the height of the weeds, resulting in the inconvenience of having to spend a great deal of effort cleaning up the vacant lot after cutting and disposing of the piled up weeds. Furthermore, depending on the type of weed being cut, the strength of the stems and vines can cause the long cut weeds to get wrapped around the output shaft of the brush cutter, which negatively impacts work efficiency.

[0006] The grass cutting blades of such brush cutters are usually called tipped saws, and the tipped saws are replaced as part of maintenance. That is, when the tipped saw blade described above deteriorates, it is replaced with a new tipped saw, and when it is replaced, cut weeds that have become wrapped around or tangled around the output shaft are removed. However, grass cutting blades that are designed to prevent weeds from wrapping around them in advance are often used, such as the grass cutting blade described in Patent Document 1.

[0007] That is, when cut weeds attempt to wrap around the output shaft of the brush cutter, the cutting blade on the outside of the output shaft cuts the weeds. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-110531 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the weeds cut by the brush cutter are long and require further processing, even if they are to be disposed of as general waste or industrial waste, or mixed with soil to be used as fertilizer, which is cumbersome.

[0010] These inconveniences are primarily due to the long cutting length of weeds by the mower blade. Because the cut weeds are long, they tend to become tangled and form clumps, which requires the weeds to be loosened, making the processing work even more labor-intensive.

[0011] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a brush cutting blade that is a chip saw that can be modified in a certain way, i.e., by modifying the peripheral cutting edge in various ways such as pointing downward, upward, or horizontally, to cut overgrown weeds and vines as short as possible, scattering the cut weeds widely and shallowly on the ground and preventing them from becoming tangled and forming clumps, making it easier to dispose of the weeds after cutting (moving or bagging them), and also preventing weeds from getting tangled around the output shaft of the brush cutter. [Means for solving the problem]

[0012] In order to solve the above-mentioned conventional problems, the present invention is characterized in that, in a disk-shaped grass-cutting blade body having a number of roughly uneven cutting blades formed on the periphery thereof, the number of adjacent cutting blades formed on the periphery of the grass-cutting blade body are formed in an alternating pattern of downwardly inclined lower cutting blades and horizontally extending horizontal cutting blades.

[0013] Another feature of the present invention is that an upper cutting blade that is inclined upward is formed midway between the lower cutting blade and the horizontal cutting blade at the periphery of the grass cutting blade body. [Effects of the Invention]

[0014] According to the present invention, by rotating two types of blades (a lower blade and a horizontal blade) or three types including an upper blade, the cut length of weeds can be shortened, and by scattering short weeds thinly over a wide area, the weeds can be easily disposed of after cutting without requiring a lot of labor. For example, tasks such as transporting the weeds and bagging them for storage can be easily performed, and furthermore, because the cut length of the weeds is short, problems such as entanglement around the output shaft of the brush cutter can be prevented. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view showing a state in which a rotary grass-cutting blade according to the present invention is attached to a brush cutter. [Figure 2] FIG. 2 is an exploded perspective view illustrating a method for attaching the rotary grass-cutting blade of the present invention to a brush cutter. [Figure 3] FIG. 2 is a bottom view illustrating the configuration of the rotary grass cutting blade according to the first embodiment of the present invention. [Figure 4] FIG. 2 is an end view illustrating a lower cutting blade and a horizontal cutting blade of a rotary grass cutting blade according to the first and third embodiments of the present invention. [Figure 5] FIG. 10 is a bottom view illustrating the configuration of a rotary grass-cutting blade according to a second embodiment of the present invention. [Figure 6] FIG. 10 is an end view illustrating a lower cutting blade, a horizontal cutting blade, and an upper cutting blade of a rotary grass cutting blade according to a second embodiment of the present invention. [Figure 7]FIG. 10 is a bottom view illustrating the configuration of a rotary grass-cutting blade according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] The gist of this invention is that in a disk-shaped grass-cutting blade body having a number of roughly uneven cutting blades formed on the periphery thereof, the number of adjacent cutting blades formed on the periphery of the grass-cutting blade body is formed in an alternating pattern of downwardly inclined lower cutting blades and horizontally extending horizontal cutting blades.

[0017] Another feature of the present invention is that an upper cutting blade that is inclined upward is formed midway between the lower cutting blade and the horizontal cutting blade at the periphery of the grass cutting blade body.

[0018] Hereinafter, embodiments of the rotary grass-cutting blade M according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state in which the rotary grass-cutting blade M according to the present invention is attached to a brush cutter 40, and the arrow at the top of the figure indicates the direction of rotation of the rotary grass-cutting blade M. FIG. 2 is an exploded view illustrating a method for attaching the rotary grass-cutting blade M according to the present invention to a brush cutter 40. FIG. 3 is a bottom view of the rotary grass-cutting blade M according to the first embodiment. FIG. 4 is an end view of the rotary grass-cutting blade M according to the first and third embodiments, where (A) shows the end view AA in FIG. 1 and the end view FF in FIG. 7, and (B) shows the end view BB in FIG. 1 and the end view GG in FIG. 7. FIG. 5 is a bottom view of the rotary grass-cutting blade M according to a second embodiment. Fig. 6 is an end view of the rotary grass-cutting blade M according to the second embodiment, where (A) shows a CC end view, (B) shows a DD end view, and (C) shows an EE end view. Fig. 7 is a bottom view of the rotary grass-cutting blade M according to the third embodiment.

[0019] The following mainly describes the first embodiment of the present invention, and also describes the second and third embodiments in relation to this. The rotary grass-cutting blade M according to the present invention is used to cut and cut weeds, vines, etc., and is attached to the output shaft 41 of a brush cutter 40, as shown in Figures 1 and 2.

[0020] For example, it is attached to the output shaft 41 of a drive source such as an engine and cuts weeds into small pieces as it rotates. As shown in Figure 2, the main components of the mounting portion of the brush cutter 40 are the output shaft 41 with a threaded groove at the tip of the rod, an output shaft cover 42 that covers the output shaft 41, a mounting bolt 43 that corresponds to the threaded groove of the output shaft 41, and a bracket 44 that is interposed between the output shaft 41 and the mounting bolt 43.

[0021] As described above, the output shaft 41 is rotated by the driving force from the drive source of the brush cutter 40. The output shaft 41 has a cylindrical shape near its lower end, and has a threaded groove formed therein into which the mounting bolt 43 can be threaded.

[0022] The bracket 44 is a circular member having an area larger than the diameter of the mounting hole 12 of the rotary grass cutting blade M, and has an insertion hole drilled in the center thereof through which the mounting bolt 43 can be inserted.

[0023] As shown in Figures 3, 5 and 7, the rotary grass cutting blade M consists of a grass cutting blade body 10 which is a base disk body that holds the cutting blade 20, and the cutting blade 20 formed on the peripheral portion 11 of the grass cutting blade body 10.

[0024] The grass cutting blade body 10 and cutting blade 20 that make up the rotary grass cutting blade M are made of metal plate-shaped members such as steel plates, and have the same thickness as a normal chip saw. Therefore, when a certain amount of wear and deterioration occurs due to usage, it is replaced with the rotary grass cutting blade M of this invention that has been stored in advance, and so-called chip saw replacement work is performed as maintenance.

[0025] The grass cutting blade body 10 is formed in a substantially circular plate shape, and a mounting hole 12 is provided in the center of the circular plate for fixing to the output shaft 41 of the brush cutter 40 .

[0026] 2, the blade is attached to the brush cutter 40 by inserting the output shaft 41 from above the mounting hole 12, and then threading the mounting bolt 43 into the threaded groove of the output shaft 41 while holding the blade body from below with the bracket 44. In other words, the blade can be attached to the output shaft 41 of the brush cutter 40 in the same way as a conventional brush cutter.

[0027] The output shaft 41 of the brush cutter 40 is connected to the drive source of the brush cutter 40, receives rotational power, and functions as a rotation output shaft of the rotary grass cutting blade M. That is, the grass cutting blade body 10 attached to the output shaft 41 of the brush cutter 40 rotates counterclockwise as shown in Figure 1 (the direction of the arrow shown in Figure 1, hereinafter referred to as the "blade rotation direction").

[0028] In addition, the grass cutting blade body 10 has a plurality of lightening holes 13 formed outside the mounting holes 12, separate from the mounting holes 12. These lightening holes 13 are provided to reduce the weight of the rotary grass cutting blade M.

[0029] The specific configuration of the cutting blade 20, which is the gist of the present invention, will be described in detail below. That is, the basic configuration of the cutting blade 20 is that a large number of uneven cutting blades 20 are formed on the peripheral edge 11 of the grass-cutting blade body 10, and the large number of cutting blades 20 formed on the peripheral edge 11 of the grass-cutting blade body 10 are formed by alternating lower cutting blades 20a that are inclined downward in side view with horizontal cutting blades 20b that extend horizontally, and in a second embodiment, an upper cutting blade 20c that is inclined further upward is formed between the lower cutting blade 20a and the horizontal cutting blade 20b on the peripheral edge 11 of the grass-cutting blade body 10.

[0030] In this way, the cutting blades 20 of various shapes are formed in an uneven shape on the extended peripheral edge 11 of the blade body 10. Because the cutting blades 20 are thus protruded in a large number at regular intervals from the peripheral edge 11 of the blade body 10 in an uneven shape, recessed spaces 30 are formed between adjacent cutting blades 20. These recessed spaces 30 function as weed capture spaces when cutting weeds, and weed stems and leaves are captured into these spaces and cut by the cutting blade 20 located on the upstream side of the rotation. Therefore, in actual cutting work with the present invention, rather than performing horizontal cutting movements back and forth and left and right as in conventional cutting work with flat blades, the cutting work is performed with an up-and-down movement, i.e., the blade body 10 is pressed against the weeds from above, so that the cut weeds are captured into the recessed spaces 30 and come into contact with the cutting blade 20 to be cut.

[0031] This working mode is achieved by the vertically inclined shape of the cutting blade 20 of the present invention, and this cutting mode makes it possible to chop tall weeds into short pieces.

[0032] 5 and 6, in a second embodiment, the multiple cutting blades 20 formed on the peripheral edge 11 of the grass cutting blade body 10 may be configured as six cutting blades 20, with three types of cutting blades 20 being alternately combined: an upwardly inclined upper cutting blade 20c, a downwardly inclined lower cutting blade 20a, and a horizontally extending horizontal cutting blade 20b. This complex combination of three types of cutting blades 20 makes it possible to shred weeds more efficiently, and is particularly ideal for cutting objects that require a large overall volume, such as intricately tangled vines.

[0033] As described above, in the second embodiment, an upper cutting blade 20c that is inclined further upward is formed between the lower cutting blade 20a and the horizontal cutting blade 20b at the peripheral portion 11 of the grass cutting blade body 10, as shown in Figure 6, resulting in a configuration of six cutting blades 20.

[0034] Specifically, the cutting blades 20 are formed alternately with downwardly inclined lower cutting blades 20a and horizontal cutting blades 20b formed horizontally from the blade body 10, with two lower cutting blades 20a and two horizontal cutting blades 20b, for a total of four cutting blades 20, and an upper cutting blade 20c is formed in the middle position, making a rotary grass cutting blade M with six cutting blades 20. The corners of the recessed space 30 are formed as curved cutting blades 21.

[0035] Furthermore, the upper part of the cutting blade 20 is 3~5 pieces The tip blade body 22 is formed with an uneven shape having a height that is one-half to one-third of the height of the cutting blade 20, and a longitudinal cutting edge 21 is formed at the tip of the cutting blade 20 that contacts the recessed space 30 of the cutting blade 20.

[0036] As shown in Figures 3, 5 and 7, the cutting blade 21 is formed on the peripheral edge 11 of the grass cutting blade body 10 and is configured as a downwardly inclined surface. The cutting blade 21 formed on the upper edge of the tip blade body 22 has a small hard piece called a tip 23.

[0037] In the first embodiment, as shown in Fig. 3, when there are four cutting blades 20, four to five tip blade bodies 22 are formed on each cutting blade 20, in the second embodiment, as shown in Fig. 5, when there are six cutting blades 20, four tip blade bodies 22 are formed, and in the third embodiment, as shown in Fig. 7, when there are eight cutting blades 20, three tip blade bodies 22 are formed. Note that, in the third embodiment, as shown in Figs. 4 and 7, the lower cutting blades 20a and the horizontal cutting blades 20b are provided alternately, similar to the rotary grass cutting blade M of the first embodiment.

[0038] In this way, as the number of cutting blades 20 increases, the number of tip blade bodies 22 formed on each cutting blade 20 decreases. This prevents a large difference in the number of cutting blades 21 formed on the overall cutting blade 20 formed on the peripheral portion 11 of the grass-cutting blade body 10. As a result, there is no large difference in the weed-cutting function regardless of the number of cutting blades 20 and the number of tip blade bodies 22, and the cutting blade 20 that is appropriate for the characteristics and propagation pattern of the weeds to be cut can be selected.

[0039] In this way, when two types of cutting blades 20, the horizontal cutting blade 20b and the lower cutting blade 20a, are provided, for example, when cutting tall weeds, the stems near the base of the weeds and the middle part of the stems can be cut. With 2 part of In particular, by placing the cutting blade 20 over the weeds and pressing down from above during cutting, the downward-facing lower cutting blade 20a cuts long weed stems into small pieces. In other words, it is possible to cut weeds into shorter pieces than with conventional brush cutting blades, which has the effect of making it easier to move and bag the weeds for post-processing. Furthermore, when using conventional brush cutting blades to cut tall weeds or vines, there is a problem in that the cut length of the weeds is long and the stems tend to get wrapped around the output shaft 41 of the brush cutter 40. In contrast, the rotary brush cutting blade M can cut weeds, vines, etc. into short pieces, which prevents the stems from getting wrapped around the output shaft 41 of the brush cutter 40.

[0040] As shown in FIGS. 4 and 6, the angles α and β of the lower cutting blade 20a and the upper cutting blade 20c relative to the grass cutting blade body 10 are formed to be equal to or greater than 90 degrees and less than 180 degrees, and both the angles α and β are in the range of 120 degrees to 160 degrees. R In this embodiment, the angles α and β are set to be approximately 135 degrees, which is considered to be the most preferable angle. The angles α and β may be within the above-mentioned angle range, and the angles α and β do not necessarily have to be the same.

[0041] In this way, in the six cutting blades 20 of the rotary grass cutting blade M according to the second embodiment, the cutting blades 20 are provided in three forms, namely, the horizontal cutting blade 20b, the lower cutting blade 20a, and the upper cutting blade 20c, so that when cutting weeds, the stems near the base and the middle part of the stems are cut. 3 Cut at the point Total 4 Shredding Stem and above That is, when cutting an object that is complicatedly tangled and has a large overall volume, such as vines, the second embodiment with six cutting blades 20 is more suitable for cutting weeds to a shorter length and more efficiently than the rotary grass-cutting blade M according to the first and third embodiments.

[0042] Of the three types of cutting blades 20 provided, namely, horizontal cutting blade 20b, lower cutting blade 20a, and upper cutting blade 20c, the lower cutting blade 20a in particular faces downward, so that when cutting the stems of weeds, the cut pieces of weeds are scattered over a wide area diagonally downward along the downward cutting direction of the cutting blade 20, scattering thinly over a wide area around the cut area and scattering in an approximately horizontal state around the cutting point.

[0043] Therefore, it is possible to eliminate the laborious work required for post-processing of cut longitudinal weeds that are piled up in layers in order as occurs with conventional horizontal cutting blades.

[0044] At the same time, since the cut grass is not in long pieces but in short-cut stems, it is easy to transport, store and dry in the sun, which simplifies the process of cutting and processing weeds that accompanies weed cutting, making a significant contribution to the efficiency and energy saving of cutting work. [Explanation of symbols]

[0045] M Rotary Grass Cutter 10 Grass cutting blade body 11 Periphery 12 Mounting holes 13 Lightweight hole 20 cutting blade 20a Lower cutting blade 20b horizontal cutting blade 20c upper cutting blade 21 Cutting blade 22 Tip blade 23 chips 30 Recessed space 40 Brush cutter 41 Output shaft 42 Output shaft cover 43 Mounting bolt 44 Bracket

Claims

1. A disk-shaped grass cutting blade body, A plurality of cutting blades are formed on the periphery of the grass cutting blade body so as to form recessed spaces between each other together with the grass cutting blade body, The cutting blade has three to five tip blade bodies formed on a tip side thereof so as to have an uneven shape with a height that is one-half to one-third of the height of the cutting blade, The plurality of cutting blades include: A lower cutting blade inclined downward to form an obtuse angle of 120 to 160 degrees with respect to the grass cutting blade body; horizontal cutting blades extending horizontally relative to the grass cutting blade body, and horizontal cutting blades are formed alternately in the circumferential direction of the grass cutting blade body, Each tip blade has a small, hard tip at its tip. A rotary grass cutting blade characterized by:

2. 2. The rotary grass cutting blade according to claim 1, wherein the plurality of cutting blades include an upper cutting blade that is formed midway between the lower cutting blade and the horizontal cutting blade in the circumferential direction and is inclined upward so as to form an obtuse angle with respect to the grass cutting blade body.

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