Brush cutter blades, brush cutter cutters

Abstract

To provide a brush cutter blade with excellent cutting ability. [Solution] A brush cutter blade that is installed on a rotating plate for a brush cutter, The brush cutter blade body contains steel, has a rod-like shape, and in a cross section perpendicular to its length, has at least one corner portion with an acute inner angle.

Description

Technical Field

[0001] The present disclosure relates to a blade for a mower and a cutter for a mower.

Background Art

[0002] Patent Document 1 discloses a nylon cord type mower.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, cutters for mowers using a chip saw or cutters for mowers using resin cords such as nylon cords have been used.

[0005] Although the cutter for a mower using a chip saw is excellent in cutting ability, when it comes into contact with a hard structure such as a concrete structure, a reaction called kickback occurs, which has imposed a great burden on the operator.

[0006] For this reason, cutters for mowers using a resin cord for the blade have also been used, but the cutting ability of the cutters for mowers using a resin cord for the blade was low. In recent years, a shortage of labor related to agricultural work has become a problem, and a blade for a mower with excellent cutting ability has been demanded.

[0007] Therefore, an object of the present disclosure is to provide a blade for a mower with excellent cutting ability.

Means for Solving the Problems

[0008] The brush cutter blade of the present disclosure is a brush cutter blade used by being installed on a rotating plate for a brush cutter, the brush cutter blade contains steel, has a rod shape, and has at least one corner portion with an acute inner angle in a cross section perpendicular to its longitudinal side. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a brush cutter blade with excellent cutting ability. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is an explanatory diagram of a brush cutter according to one aspect of the present disclosure. [Figure 2] Figure 2 is a perspective view of a brush cutter blade according to one aspect of the present disclosure. [Figure 3A] Figure 3A is a cross-sectional view along the CC line in Figure 2. [Figure 3B] Figure 3B is an enlarged view of area D in Figure 3A. [Figure 3C] Figure 3C is an enlarged view of area D in Figure 3A. [Figure 4A] Figure 4A shows another example of a cross-section perpendicular to the longitudinal side of a brush cutter blade according to one aspect of the present disclosure. [Figure 4B] Figure 4B shows another example of a cross-section perpendicular to the longitudinal side of a brush cutter blade according to one aspect of the present disclosure. [Figure 4C] Figure 4C shows another example of a cross-section perpendicular to the longitudinal side of a brush cutter blade according to one aspect of the present disclosure. [Figure 4D] Figure 4D shows another example of a cross-section perpendicular to the longitudinal side of a brush cutter blade according to one aspect of the present disclosure. [Figure 5A] Figure 5A is a cross-sectional view along line AA in Figure 1. [Figure 5B] Figure 5B is a cross-sectional view along line AA in Figure 1. [Figure 6] Figure 6 is an explanatory diagram of a clip. [Figure 7] Figure 7 is a cross-sectional view along line AA in Figure 1. [Figure 8A] Figure 8A is an explanatory diagram of the wall section. [Figure 8B] Figure 8B is an explanatory diagram of the wall portion. [Figure 9A] Figure 9A is an explanatory diagram of the concave portion. [Figure 9B] Figure 9B is an explanatory diagram of the concave portion. [Figure 9C] Figure 9C is an explanatory diagram of the concave portion. [Figure 9D] Figure 9D is an explanatory diagram of the concave portion. [Figure 9E] Figure 9E is an explanatory diagram of the concave portion. [Figure 10] Figure 10 is an explanatory diagram of the mower. [Figure 11] Figure 11 shows the evaluation results of Experimental Example 1, Experimental Example 2, Experimental Example 3, and Experimental Example 4.

Mode for Carrying Out the Invention

[0011] The mode for carrying out will be described below.

[0012] [Description of Embodiments of the Present Disclosure] First, the embodiments of the present disclosure will be listed and described. In the following description, the same or corresponding elements are denoted by the same reference numerals, and the same description thereof will not be repeated.

[0013] (1) The blade body for a mower according to one aspect of the present disclosure is a blade body for a mower that is installed and used on a rotating plate for a mower. The blade body for a mower contains steel, has a rod-like shape, and has at least one corner portion with an acute interior angle in a cross section perpendicular to the longitudinal direction.

[0014] Regarding the blade body for a mower, by containing steel, the blade body is harder than resin cords such as nylon cords that have been conventionally used, so that grass can be cut efficiently and the grass cutting ability can be enhanced.

[0015] The corners are designed to improve cutting performance by making contact with the grass during mowing, causing cuts and scratches in the grass. By making the inner angle of the corners acute, i.e., less than 90 degrees, it is possible to make cuts and scratches in the grass more easily.

[0016] (2) In (1), the first side surface and the second side surface located opposite the first side surface may each have the corner portion.

[0017] The presence of corners on both the first and second sides allows for repeated mowing, which can deform the shape of the corners on the first side and reduce mowing capacity. In such cases, the corners on the second side can be used for mowing, thus extending the lifespan of the brush cutter blade.

[0018] (3) In (1) or (2), the interior angle of the corner may be 15 degrees or more and 75 degrees or less.

[0019] By making the inner angle of the corners 75 degrees or less, it becomes easier to cut into the grass and create scratches, which significantly improves the cutting ability.

[0020] By making the inner angle of the corners 15 degrees or more, it is possible to prevent damage to objects other than grass from being scratched or damaged when they come into contact with the corners. In addition, by making the inner angle of the corners 15 degrees or more, the blade of the brush cutter can be made thicker, which prevents the blade from deforming.

[0021] (4) In any of (1) to (3), the corner in the cross-section may include a curve with a radius of curvature of 0.1 mm or more and 1 mm or less, or a straight line with a length of 0.1 mm or more and 1 mm or less.

[0022] The corners of the brush cutter blade are chamfered, which prevents damage to objects other than grass from being scratched or damaged if they come into contact with the corners.

[0023] By including a curve with a radius of curvature of 0.1 mm or more at the corner, it is possible to prevent damage to objects other than grass from occurring when they come into contact with the corner. Furthermore, by including a curve with a radius of curvature of 1 mm or less at the corner, it becomes easier to cut into the grass and cause scratches, thereby particularly enhancing the cutting ability.

[0024] The corners include straight sections of 0.1 mm or longer, which prevents damage to objects other than grass if they come into contact with the corners. Furthermore, the corners include straight sections of 1 mm or less, which makes it easier to cut and damage the grass, thereby significantly improving the cutting performance.

[0025] (5) In any of (1) to (4), the corner portion may be located in a place other than the center line of the thickness in the cross-section.

[0026] According to the inventors' research, by positioning the corners at locations other than the center line of the thickness, that is, at locations offset from the center line of the thickness of the brush cutter blade, it is possible to prevent the brush cutter blade from wobbling when the brush cutter is rotated. As a result, the cutting capacity can be significantly improved.

[0027] (6) In any of (1) to (5), the maximum thickness in the cross-section may be 1 mm or more and 7 mm or less.

[0028] By making the maximum thickness of the brush cutter blade, perpendicular to its length, 1 mm or more, deformation or damage to the blade can be prevented during grass cutting. By making the maximum thickness of the brush cutter blade, perpendicular to its length, 7 mm or less, the brush cutter blade and the brush cutter cutter with the blade installed can be made lighter, improving handling.

[0029] (7) In any of (1) to (6), one or more materials selected from carbon steel, stainless steel, and low alloy steel may be included, and the carbon content of the carbon steel may be 0.5% by mass or more.

[0030] By incorporating one or more types of steel selected from carbon steel, stainless steel, and low-alloy steel into the blade of a brush cutter, the cost of the blade can be reduced while increasing its strength. Therefore, when the blade is used in a brush cutter, the cutting performance can be significantly improved.

[0031] (8) In any of (1) to (7), the yield strength may be 1000 MPa or more.

[0032] The yield stress is the stress at which plastic deformation of a material begins. By setting the yield stress to 1000 MPa or higher, it is possible to prevent plastic deformation or fracture of the brush cutter blade, thereby extending the lifespan of the brush cutter blade.

[0033] (9) In any of (1) to (8), the brush cutter blade may have a through hole at the first end along its length that is in line with the thickness of the brush cutter blade.

[0034] The brush cutter blade has a through hole, allowing it to be easily installed on the brush cutter's rotating plate by inserting a pin into the through hole.

[0035] (10) In any of (1) to (8), the brush cutter blade has an end member provided at a first end along its longitudinal direction, and a bent portion disposed between the first end and a second end located opposite the first end, and the cross-sectional area of ​​the end member in a plane perpendicular to the longitudinal direction of the brush cutter blade may be larger than the cross-sectional area of ​​the second end in a plane perpendicular to the longitudinal direction of the brush cutter blade.

[0036] Because the brush cutter blade has an end member, the brush cutter blade can be easily installed on the brush cutter's rotating plate simply by inserting the brush cutter blade into the installation hole provided on the rotating plate.

[0037] (11) A brush cutter according to one aspect of the present disclosure comprises a rotating plate for a brush cutter having a first surface and a second surface located opposite to the first surface, and a plurality of brush cutter blades arranged along the outer circumference of the rotating plate for a brush cutter, wherein each brush cutter blade contains steel, has a rod shape, and has at least one corner portion with an acute inner angle in a cross section perpendicular to its longitudinal side, and each brush cutter blade has a first end along its longitudinal side and a second end located opposite to the first end, at least a portion of which is located on the first surface, and is rotatably mounted on the rotating plate for a brush cutter about the first end.

[0038] By mounting the brush cutter blade on a rotating plate for the brush cutter so that it can rotate, even if the brush cutter blade comes into contact with a stone or other object during grass cutting and is subjected to an impact, the impact can be absorbed, preventing the brush cutter blade from being damaged.

[0039] When a saw blade is used as a cutter for a brush cutter, contact with hard structures such as concrete structures during grass cutting can cause a large recoil called kickback, which places a significant burden on the operator. In contrast, a brush cutter according to one aspect of this disclosure has the brush cutter blade rotatably mounted on the brush cutter's rotating plate. Therefore, even when contact with hard structures such as concrete structures is made during grass cutting, the recoil is reduced, thereby lessening the burden on the operator.

[0040] Regarding the blades for brush cutters, by incorporating steel, the blades are harder than conventionally used resin cords such as nylon cords. As a result, even though they are rotatably mounted on the brush cutter's rotating plate, they can efficiently cut grass, thus improving grass cutting performance.

[0041] The corners are designed to improve cutting performance by making contact with the grass during mowing, causing cuts and scratches in the grass. By making the inner angle of the corners acute, i.e., less than 90 degrees, it is possible to make cuts and scratches in the grass more easily.

[0042] (12) In (11), the brush cutter blade may further have a plurality of pins, the first end of the brush cutter blade may have a through hole, and the brush cutter blade may be installed on the brush cutter rotating plate by the pins inserted into the through hole.

[0043] The brush cutter has a pin, which allows the brush cutter blade to be attached to the brush cutter's rotating plate, making it easy to install and remove the blade. This improves the efficiency of installing and replacing the brush cutter blade.

[0044] (13) (11) or (12) may further include a clip to be installed at the end along the longitudinal side of the pin.

[0045] By attaching a clip to the end of the pin, the movement of the brush cutter blade can be restricted, preventing the blade from coming off the pin.

[0046] (14) In (11), the rotating plate for the brush cutter has a plurality of mounting holes along the outer circumference of the rotating plate for the brush cutter, the blade body for the brush cutter has an end member provided at the first end and a bent portion disposed between the first end and the second end, the cross-sectional area of ​​the end member on a plane perpendicular to the longitudinal side of the blade body for the brush cutter is larger than the cross-sectional area of ​​the second end on a plane perpendicular to the longitudinal side of the blade body for the brush cutter, the mounting holes penetrate from the first surface to the second surface, the blade body for the brush cutter may be inserted into the mounting holes and installed on the rotating plate for the brush cutter by the end member.

[0047] The brush cutter blade has an end member, and by inserting the brush cutter blade into an installation hole provided in the brush cutter's rotating plate, the brush cutter blade can be installed on the rotating plate, making it easy to install and remove the brush cutter blade. This improves the work efficiency of installing and replacing the brush cutter blade.

[0048] (15) In (11) to (14), the rotating plate for the brush cutter has a wall portion on the first surface, and when the end located on the first surface, along the longitudinal direction of the brush cutter blade body, and opposite to the second end, is defined as the third end, the wall portion may be arranged to face at least a part of the third end.

[0049] The blade for a brush cutter is mounted on a rotating plate for the brush cutter so as to be rotatable around its first end. However, when mowing grass using a brush cutter, grass may get tangled around the rotating part, requiring grass removal or other maintenance.

[0050] In contrast, the rotating plate for the brush cutter has a wall portion positioned to face at least a portion of the third end of the brush cutter blade, thereby reducing the amount of grass that gets tangled around the third end of the brush cutter blade on the first surface of the rotating plate. As a result, when mowing grass with a brush cutter, the frequency of tasks such as removing tangled grass can be reduced. In other words, wasted time spent on tasks other than mowing can be eliminated, and efficiency can be increased.

[0051] [Details of the embodiments of this disclosure] Specific examples of a brush cutter blade and a brush cutter according to one embodiment of this disclosure (hereinafter referred to as "this embodiment") will be described below with reference to the drawings. The present invention is not limited to these examples, and is intended to be shown in the claims, with all modifications in the sense and scope equivalent to the claims.

[0052] In this specification, the names of components may be described with prefixes such as "1st end," "2nd end," etc. The prefixes "1st," "2nd," etc., are merely used to identify each component and do not indicate their arrangement, priority, or anything of that sort. [Brush cutter blades] The blade body for the brush cutter according to this embodiment will be described below with reference to the drawings.

[0053] The drawings used in the following explanation will each be briefly described.

[0054] Figure 1 is a perspective view showing a brush cutter cutter in which a brush cutter blade 20 according to one aspect of the present disclosure is installed on a brush cutter rotating plate 11.

[0055] Figure 2 is a perspective view of a brush cutter blade 20 according to one aspect of the present disclosure.

[0056] Figure 3A corresponds to the cross-sectional view along line CC in Figure 2. Figures 3B and 3C correspond to enlarged views of region D in Figure 3A. Figure 3C shows the shape of the top of the corner, corresponding to another configuration example in Figure 3B.

[0057] Figures 4A, 4B, 4C, and 4D represent other configuration examples of the cross-sectional view of a brush cutter blade according to one aspect of this disclosure, and correspond to the cross-sectional view along line CC in Figure 2.

[0058] Figures 5A and 5B are explanatory diagrams of a structure in which a brush cutter blade body according to one aspect of the present disclosure is mounted on a brush cutter rotating plate, and correspond to the cross-sectional view along line AA in Figure 1. Figure 5B is another example of the configuration shown in Figure 5A. Figure 6 is an explanatory diagram of a clip.

[0059] Figure 7 is an explanatory diagram of a structure in which a brush cutter blade according to one aspect of the present disclosure is installed on a brush cutter rotating plate 11, and corresponds to a cross-sectional view along line AA in Figure 1. Figure 7 is another example of the configuration shown in Figures 5A and 5B.

[0060] Figures 8A and 8B are explanatory diagrams of an example of the wall structure, and correspond to the top view when viewed along block arrow B in Figure 1.

[0061] Figures 9A, 9B, 9C, 9D, and 9E are explanatory diagrams of the shape of the recess in the wall, and correspond to the top view when viewed along block arrow B in Figure 1.

[0062] Figure 10 is an explanatory diagram showing how a brush cutter blade and brush cutter according to one aspect of the present disclosure are installed on a grass trimmer.

[0063] Figures 2, 3A, 3B, 3C, 4A, 4B, 4C, 4D, 5A, 5B, 6, and 7 show the coordinate axes. In the coordinate axes shown in the figures, the X-axis is the axis along the thickness of the brush cutter blade, the Y-axis is the axis along the width of the brush cutter blade, and the Z-axis is the axis along the length of the brush cutter blade.

[0064] As shown in Figure 1, the brush cutter blade 20 of this embodiment can be used by installing it on the brush cutter rotating plate 11.

[0065] Figure 1 shows an example in which six brush cutter blades 20 are installed on a brush cutter rotating plate 11, but the number of brush cutter blades 20 installed on the brush cutter rotating plate 11 is not particularly limited. The number of brush cutter blades 20 installed on the brush cutter rotating plate 11 can be selected according to the length of the brush cutter blades 20, the size of the brush cutter rotating plate 11, the performance required of the brush cutter cutter 10, etc., and can be selected so as not to interfere with adjacent brush cutter blades 20 when mowing grass. For example, two or more brush cutter blades 20 may be installed on the brush cutter rotating plate 11, or three or more may be installed. There is no particular upper limit to the number of brush cutter blades 20 installed on the brush cutter rotating plate 11, but considering the workload during installation and replacement, it may be 15 or less, or 10 or less. Therefore, the brush cutter blades 20 of this embodiment may be installed on the brush cutter's rotating plate in quantities of 2 to 15, or 3 to 10.

[0066] The arrangement of the brush cutter blade 20 on the rotating plate 11 is not particularly limited, but the first end 21, which is the end of the brush cutter blade 20 along its longitudinal side, may be arranged at equal intervals along the outer circumference of the rotating plate 11. (1) Overview of brush cutter blades The brush cutter blade 20 of this embodiment can have a rod-like shape as shown in Figure 2. However, the brush cutter blade 20 of this embodiment can also have through holes, bent portions, end members, etc.

[0067] The brush cutter blade 20 of this embodiment may contain steel, and may be a steel wire blade.

[0068] A steel wire blade refers to a blade made by processing a material containing steel into a rod (wire) shape. The brush cutter blade 20 of this embodiment may have plating or the like on its surface if necessary.

[0069] Regarding the brush cutter blade 20, by incorporating steel, the blade is harder compared to conventionally used resin cords such as nylon cord, allowing for more efficient grass cutting and improved grass cutting performance. (2) Description of each part of the brush cutter blade (2-1) Corner Figure 3A shows a cross-sectional view along line CC in Figure 2, that is, a cross-sectional view perpendicular to the longitudinal side of the brush cutter blade 20 of this embodiment. Figures 3B and 3C show enlarged views of region D in Figure 3A. As shown in Figures 3A, 3B, and 3C, the brush cutter blade 20 of this embodiment can have at least one corner 23 with an acute internal angle θ23 in a cross-section perpendicular to its longitudinal side.

[0070] The corner portion 23 is provided to enhance the cutting ability by coming into contact with the grass during mowing and creating cuts or scratches in the grass. In other words, the corner portion 23 functions as a blade when mowing grass. By making the inner angle θ23 of the corner portion 23 acute, i.e., less than 90 degrees, it is possible to easily create cuts or scratches in the grass. (2-1-1) Regarding the arrangement of corners The corner portion 23 can be provided in the part that comes into contact with the grass when mowing. For this reason, the corner portion 23 can be provided on the first side surface 20A, which is one side surface of the brush cutter blade 20, as shown in the brush cutter blade 201 shown in Figures 2 and 3A, and the brush cutter blade 202 shown in Figure 4A. Figure 4A is a cross-sectional view of the brush cutter blade 202, which is a modified example of the brush cutter blade 20, in a plane perpendicular to the longitudinal side.

[0071] In this specification, the side surface of the brush cutter blade 20 refers to the surface that comes into contact with the grass when the brush cutter blade 20 is installed on the brush cutter rotating plate 11 and the brush cutter rotating plate 11 is rotated to cut grass, that is, the surface that intersects with the direction of rotation of the brush cutter rotating plate 11.

[0072] As shown in Figure 4B (brush cutter blade 203), Figure 4C (brush cutter blade 204), and Figure 4D (brush cutter blade 205), the corner portion 23 can be provided not only on the first side surface 20A, but also on the second side surface 20B, which is located opposite the first side surface 20A. In other words, in a cross section perpendicular to the longitudinal side of the brush cutter blade 20, the first side surface 20A and the second side surface 20B, which is located opposite the first side surface 20A, can each have a corner portion 23.

[0073] Figures 4B, 4C, and 4D are cross-sectional views of brush cutter blades 203, 204, and 205, respectively, which are modified examples of the brush cutter blade 20, in a plane perpendicular to the longitudinal side.

[0074] Since the first side surface 20A and the second side surface 20B have corners 23, if the shape of the corner 23 on the first side surface 20A deforms and the cutting capacity decreases after repeated mowing, the corner 23 on the second side surface 20B can be used for mowing. In other words, the lifespan of the brush cutter blade 20 can be extended. When mowing using the corner 23 on the second side surface 20B, the arrangement of the upper surface 20C and the lower surface 20D of the brush cutter blade 20 should be reversed when it is installed on the brush cutter rotating plate 11.

[0075] The corners 23 of the first side surface 20A and the corners of the second side surface 20B may be arranged symmetrically, as shown in Figure 4B for the brush cutter blade 203 and Figure 4D for the brush cutter blade 205, and the size and shape of the inner angle θ23 of the corners 23 may be the same.

[0076] The corners 23 of the first side surface 20A and the corners of the second side surface 20B do not necessarily have to be arranged symmetrically, as shown in the brush cutter blade 204 in Figure 4C.

[0077] Furthermore, the corners 23 of the first side surface 20A and the corners 23 of the second side surface 20B may differ in size, shape, number, etc.

[0078] The first side surface 20A and the second side surface 20B may each have one corner 23, or they may each have two or more corners 23. The number of corners 23 on the first side surface 20A and the second side surface 20B may be the same or different.

[0079] The first end portion 21, which is the end portion along the longitudinal side of the brush cutter blade 20, is located on the brush cutter's rotating plate 11 and contributes little to grass cutting. For this reason, the corner portion 23 may be provided continuously along the entire longitudinal side of the brush cutter blade 20, except for the first end portion 21.

[0080] However, the brush cutter blade of this embodiment can be manufactured, for example, by drawing or rolling the base material and then cutting it to the desired length. Therefore, productivity can be increased by keeping the cross-sectional shape perpendicular to the longitudinal side constant for the brush cutter blade 20 of this embodiment. Accordingly, from the viewpoint of increasing productivity and reducing costs, the corners 23 may be provided continuously along the longitudinal side of the brush cutter blade 20. (2-1-2) Size of the interior angle of the corner The angle of the interior angle θ23 of the corner 23 does not need to be more than 90 degrees, but it may be, for example, between 15 degrees and 75 degrees.

[0081] By setting the inner angle θ23 of the corner 23 to 75 degrees or less, it becomes easier to cut into the grass and create scratches, thereby significantly improving the cutting ability.

[0082] By making the inner angle θ23 of the corner 23 15 degrees or more, it is possible to prevent damage to objects other than grass from occurring when they come into contact with the corner 23. In addition, by making the inner angle θ23 of the corner 23 15 degrees or more, the brush cutter blade 20 can be made thicker, which prevents deformation of the brush cutter blade 20. (2-1-3) Regarding the shape of the corners The corner portion 23 may be chamfered. In a cross section perpendicular to the longitudinal side of the brush cutter blade body 20, as shown in Figure 3B, the corner portion 23 may include a curve with a radius of curvature R23 of 0.1 mm or more and 1 mm or less, and as shown in Figure 3C, the corner portion 23 may include a straight line with a length L23 of 0.1 mm or more and 1 mm or less.

[0083] The corners 23 of the brush cutter blade 20 are chamfered, which prevents scratches and other damage from occurring when objects other than grass come into contact with the corners 23. Because the corners 23 are chamfered, the top of the cross section perpendicular to the longitudinal side of the brush cutter blade 20 may include curves or straight lines.

[0084] The corner 23 includes a curve with a radius of curvature R23 of 0.1 mm or more, which prevents damage to objects other than grass when they come into contact with the corner 23. Furthermore, the corner 23 includes a curve with a radius of curvature R23 of 1 mm or less, which makes it easier to cut into the grass and cause scratches, thereby particularly enhancing the mowing capacity.

[0085] The corner portion 23 includes a straight line with a length L23 of 0.1 mm or more, which prevents damage to objects other than grass from occurring when they come into contact with the corner portion 23. Furthermore, the corner portion 23 includes a straight line with a length L23 of 1 mm or less, which makes it easier to cut into the grass and cause scratches, thereby particularly enhancing the cutting ability. (2-1-4) Regarding the arrangement of corners The arrangement of the corners 23 in the brush cutter blade 20 is not particularly limited.

[0086] For example, as shown in Figure 3A for the brush cutter blade 201 and Figure 4B for the brush cutter blade 203, the corner portion 23 may be positioned on a straight line E in a cross-section perpendicular to the longitudinal side of the brush cutter blade 20.

[0087] Line E represents the centerline of the thickness in a cross-section perpendicular to the longitudinal side of the brush cutter blade 20. In this specification, the centerline of the thickness means a horizontal line passing through the center of the thickness, i.e., the center between the upper surface 20C and the lower surface 20D, at the portion of the brush cutter blade 20 that is at its maximum thickness.

[0088] Furthermore, as shown in Figure 4A, Figure 4C, Figure 4C, and Figure 4D, for example, the corner portion 23 may be located in a place other than the straight line E in a cross-section perpendicular to the longitudinal side of the brush cutter blade 20. In other words, the brush cutter blade 205 of this embodiment does not have to have a vertically symmetrical shape.

[0089] According to the inventors' research, by positioning the corner portion 23 at a location other than the straight line E, that is, at a location offset from the center line of the thickness of the brush cutter blade, it is possible to prevent the brush cutter blade 20 from wobbling when the brush cutter is rotated. As a result, the cutting capacity can be particularly enhanced. (2-2) Through hole As shown in Figure 2, the brush cutter blade 20 may have a through hole 24 in the first end 21 that is aligned with its thickness. That is, the brush cutter blade 20 may have a through hole 24 that connects the upper surface 20C and the lower surface 20D.

[0090] Since the brush cutter blade 20 has a through hole 24, as shown in Figures 5A and 5B, the brush cutter blade 20 can be easily installed on the brush cutter rotating plate 11 by inserting the pin 51 into the through hole 24.

[0091] Figures 5A and 5B are cross-sectional views of the brush cutter blade 20 along its central axis, illustrating the state in which the brush cutter blade 20 is installed on the brush cutter rotating plate 11.

[0092] An example of the configuration for installing the brush cutter blade 20 onto the brush cutter rotating plate 11 will be explained in the section on brush cutter cutters. (2-3) Bent section, end member The brush cutter blade 20 has a shape in which the longitudinal and perpendicular cross-sections are substantially constant, as shown in Figures 2, 5A, and 5B, and is not limited to having a through hole 24.

[0093] For example, as shown in Figure 7, the brush cutter blade 20 may also have an end member 211 provided at the first end 21, and a bent portion 200 provided between the first end 21 and the second end 22 located opposite the first end 21 of the brush cutter blade 20. Figure 7 is a cross-sectional view of the brush cutter blade 20 in a plane passing through the central axis, and is an explanatory diagram of the state in which the brush cutter blade 20 is inserted through the opening 112A of the installation hole 112 of the brush cutter rotating plate 11.

[0094] The position of the bent portion 200 in the brush cutter blade 20 is not particularly limited and can be arbitrarily selected according to the thickness of the brush cutter rotating plate 11, etc. For example, the length L70 from the end member 211 to the bent portion 200 can be set to 3 mm or more and 10 mm or less.

[0095] The cross-sectional area of ​​the end member 211 in a plane perpendicular to the longitudinal side of the brush cutter blade 20 may be larger than the cross-sectional area of ​​the second end member 22 in a plane perpendicular to the longitudinal side of the brush cutter blade 20.

[0096] The cross-sectional area of ​​the brush cutter blade 20 in a plane perpendicular to its longitudinal side may be constant from the second end 22 to the bent portion 200, or it may be constant from the second end 22 to the end member 211. Here, "constant cross-sectional area" includes a range that can be considered constant within the production tolerance.

[0097] The end member 211 is a member for installing and fixing the brush cutter blade 20 to the brush cutter rotating plate 11 when the brush cutter blade 20 is inserted from the second end 22 into the installation hole 112 of the brush cutter rotating plate 11. The installation hole 112 may be a through hole that penetrates from the first surface 11A to the second surface 11B of the brush cutter rotating plate 11. The installation hole 112 may have a shape in which the first installation hole 1121 and the second installation hole 1122 are connected. The first installation hole 1121 and the second installation hole 1122 may have different sizes and shapes in a cross section perpendicular to the longitudinal side.

[0098] For example, the size and shape of the first mounting hole 1121 can be selected so that the portion of the brush cutter blade body 20 from the second end 22 to the end member 211 can pass through. The size and shape of the first mounting hole 1121 can be selected so that the end member 211 cannot pass through. The size and shape of the second mounting hole 1122 can be selected so that, for example, the end member 211 can be accommodated.

[0099] Since the brush cutter blade 20 rotates within the first mounting hole 1121 with the center of the end member 211 as the center of rotation, the first mounting hole 1121 may have a circular cross-sectional shape perpendicular to its longitudinal side so as not to obstruct the rotation of the brush cutter blade 20.

[0100] Therefore, for example, the length of the long axis of the end member 211 in a plane perpendicular to the longitudinal side of the brush cutter blade 20 may be longer than the diameter of the first mounting hole 1121 in the brush cutter rotating plate 11.

[0101] The portion of the brush cutter blade 20 from the second end 22 to the bent portion 200 is the portion that is inserted into the first installation hole 1121 of the brush cutter rotating plate 11 when the brush cutter blade 20 is installed on the brush cutter rotating plate 11, and passes through the first installation hole 1121.

[0102] Furthermore, the area between the bent portion 200 and the end member 211 of the brush cutter blade 20 is also a portion that passes through or is located within the first installation hole 1121 when the brush cutter blade 20 is installed on the brush cutter rotating plate 11.

[0103] For this reason, for example, the length of the long axis of the brush cutter blade 20 in the plane perpendicular to the longitudinal side of the brush cutter blade 20 in the portion from the second end 22 to the end member 211 may be shorter than the diameter of the first mounting hole 1121 in the brush cutter rotating plate 11.

[0104] The lengths and shapes of the parts described are just examples. The first mounting hole 1121 should be sized and shaped so that the portion of the brush cutter blade 20 from the second end 22 to the end member 211 can pass through, but the end member 211 cannot. The second mounting hole 1122 should be sized and shaped so that, for example, the end member 211 can be accommodated.

[0105] Because the brush cutter blade 20 has an end member 211, the brush cutter blade 20 can be easily installed on the brush cutter rotating plate 11 simply by inserting the brush cutter blade 20 into the installation hole 112 provided in the brush cutter rotating plate 11. (3) Regarding the size of the blade for the brush cutter (3-1) Maximum width The brush cutter blade 20 may have a maximum width W20 (see Figure 3A) of 2 mm to 12 mm in a cross section perpendicular to the longitudinal side of the brush cutter blade 20, or it may have a maximum width of 4 mm to 10 mm. By making the maximum width W20 of the brush cutter blade 20 perpendicular to the longitudinal side of the brush cutter blade 20 2 mm or more, deformation or damage to the brush cutter blade 20 can be prevented when mowing grass. By making the maximum width W20 of the brush cutter blade 20 perpendicular to the longitudinal side of the brush cutter blade 20 12 mm or less, the brush cutter blade 20 and the brush cutter cutter with the brush cutter blade 20 installed can be made lighter, improving handling.

[0106] The maximum width W20 refers to the maximum length between the first side surface 20A and the second side surface 20B in a cross section perpendicular to the longitudinal side of the brush cutter blade 20. (3-2) Maximum thickness The brush cutter blade 20 may have a maximum thickness T20 (see Figure 3A) of 1 mm or more and 7 mm or less in a cross section perpendicular to the longitudinal side of the brush cutter blade 20. By making the maximum thickness T20 of the brush cutter blade 20 perpendicular to the longitudinal side 1 mm or more, deformation or damage to the brush cutter blade 20 can be prevented when mowing grass. By making the maximum thickness T20 of the brush cutter blade 20 perpendicular to the longitudinal side 7 mm or less, the brush cutter blade 20 and the brush cutter cutter with the brush cutter blade 20 installed can be made lighter, improving handling.

[0107] The maximum thickness T20 refers to the maximum length between the upper surface 20C and the lower surface 20D in a cross section perpendicular to the longitudinal side of the brush cutter blade 20. (3-3) Maximum length The brush cutter blade 20 may have a maximum length L20 (see Figure 2) of 20 mm or more and 100 mm or less, or 40 mm or more and 80 mm or less. Setting the maximum length L20 of the brush cutter blade 20 to 20 mm or more can improve the cutting capacity. Setting the maximum length L20 of the brush cutter blade 20 to 100 mm or less can prevent the brush cutter blade 20 from being damaged during grass cutting.

[0108] The maximum length L20 is the maximum length along the longitudinal side of the brush cutter blade 20, and if the brush cutter blade 20 has a bent portion 200 or an end member 211, it will be the maximum length along the longitudinal side of the brush cutter blade 20 including the bent portion 200 and the end member 211. (4) Materials for brush cutter blades The material of the brush cutter blade 20 in this embodiment is not particularly limited. The brush cutter blade 20 in this embodiment may contain steel, for example, or it may be made of steel wire. Steel wire refers to a rod-shaped steel wire made by drawing a base material containing steel into a predetermined shape. The steel wire may also have plating on its surface.

[0109] The steel contained in the brush cutter blade 20 of this embodiment may include one or more types selected from carbon steel, stainless steel, and low-alloy steel. The carbon steel may have a carbon content of 0.5% by mass or more. By including one or more types selected from carbon steel, stainless steel, and low-alloy steel in the brush cutter blade 20, the cost of the brush cutter blade 20 can be reduced while increasing its strength. Therefore, when the brush cutter blade 20 is used in a brush cutter, the cutting capacity can be particularly enhanced.

[0110] For carbon steel, the carbon content may be 0.6% by mass or more. Furthermore, there is no particular upper limit to the carbon content in carbon steel, but it may be, for example, 0.95% by mass or less, or 0.85% by mass or less.

[0111] Therefore, the carbon steel used for the brush cutter blade 20 may have a carbon content of 0.5% by mass or more and 0.95% by mass or less, or 0.6% by mass or more and 0.85% by mass or less.

[0112] Examples of stainless steel include SUS304 and SUS630.

[0113] Low-alloy steel refers to alloy steel in which the total amount of alloying elements added to the steel is 5% by mass or less. Alloying elements refer to alloying elements other than iron and carbon. Examples of low-alloy steel include spring steel containing silicon and chromium, weathering steel containing copper, phosphorus, and chromium, low-temperature steel such as 2.5% Ni steel, nickel-chromium steel, nickel-chromium-molybdenum steel, and chromium-molybdenum steel.

[0114] The brush cutter blade 20 may have a plating film on its surface. The material of the plating film is not particularly limited. The plating film may contain one or more materials selected from, for example, zinc, chromium, nickel, etc.

[0115] The brush cutter blade 20 has a plating film on its surface, which enhances corrosion resistance and extends the lifespan of the brush cutter blade. (Regarding the physical properties of brush cutter blades) The brush cutter blade 20 of this embodiment may have a yield strength of 1000 MPa or more, or 1200 MPa or more. Since the yield strength is the stress at which plastic deformation of the material begins, setting the yield strength to 1000 MPa or more prevents the brush cutter blade 20 from undergoing plastic deformation or breaking, thereby extending the lifespan of the brush cutter blade 20.

[0116] The yield strength of the brush cutter blade 20 can be selected by the material of the brush cutter blade 20, for example, by adjusting the carbon content of the steel contained in the brush cutter blade 20.

[0117] The upper limit of the yield strength of the brush cutter blade 20 is not particularly limited, but the yield strength of the brush cutter blade 20 may be, for example, 2000 MPa or less, or 1600 MPa or less. By setting the yield strength of the brush cutter blade 20 to 2000 MPa or less, the manufacturing cost of the brush cutter blade 20 can be reduced.

[0118] The yield strength of the brush cutter blade 20 may be 1000 MPa or more and 2000 MPa or less, or 1200 MPa or more and 1600 MPa or less. (5) Method for manufacturing a brush cutter blade The method for manufacturing the brush cutter blade 20 is not particularly limited and may include, for example, a wire drawing step, a rolling step, and a cutting step.

[0119] In the wire drawing process, the base material that will become the blade body 20 for the brush cutter can be drawn.

[0120] In the rolling process, the drawn base material is rolled using rollers or the like to form corners and other features.

[0121] In the cutting process, the wire obtained after rolling can be cut according to the desired length of the brush cutter blade 20.

[0122] The manufacturing method for the brush cutter blade 20 of this embodiment may include one or more steps selected from, if necessary, a bending step to form a bent portion, an end member forming step to form an end member, a through hole forming step to form a through hole, and so on.

[0123] In the bending process, the blade body 20 for the brush cutter, which has been drawn and rolled to form corners and other parts, can be bent to create a bent section.

[0124] In the end member formation process, an end member 211 can be formed on the first end 21 of the brush cutter blade body 20, which has been drawn and rolled to form corners, etc., by forging or the like.

[0125] In the through-hole formation process, a hole is drilled in the first end portion 21 of the brush cutter blade 20, which has been drawn and rolled to form corners and other parts, thereby forming a through-hole 24.

[0126] In this explanation, the manufacturing method for the brush cutter blade 20 was described using an example that includes a wire drawing process, a rolling process, and a cutting process. However, the brush cutter blade 20 may be manufactured in a desired shape by forging, cutting, casting, or other methods. [Brush cutter cutter] Next, the brush cutter of this embodiment will be described. The brush cutter of this embodiment may include a brush cutter blade according to one aspect of the present disclosure. For this reason, some of the matters already described will be omitted.

[0127] As shown in Figure 1, the brush cutter cutter 10 of this embodiment may have a rotating plate 11 for the brush cutter and a plurality of brush cutter blades 20 according to one aspect of the present disclosure arranged on the rotating plate 11 along the outer circumference 110 of the rotating plate 11.

[0128] The rotating plate 11 for the brush cutter has a first surface 11A and a second surface 11B located opposite the first surface.

[0129] The brush cutter blade 20 has a first end 21 along its length and a second end 22 located opposite the first end 21. The brush cutter blade 20 can be rotatably mounted around the first end 21 as shown by the double arrow 101. As shown in Figure 1, at least a portion of the brush cutter blade 20 is positioned on the first surface 11A of the brush cutter rotating plate 11.

[0130] As already described, the brush cutter blade 20 may contain steel. Furthermore, the brush cutter blade 20 has a rod-like shape and may have at least one acute corner 23 with an internal angle θ23 in a cross section perpendicular to its longitudinal side.

[0131] By rotatably mounting the brush cutter blade 20 on the brush cutter rotating plate 11, even if the brush cutter blade 20 comes into contact with a stone or other object during grass cutting and is subjected to an impact, the impact can be absorbed, preventing damage to the brush cutter blade 20.

[0132] When using a saw blade as a cutter for a brush cutter, contact with hard structures such as concrete structures during grass cutting can cause a large recoil called kickback, placing a significant burden on the operator. In contrast, the brush cutter 10 has the brush cutter blade 20 rotatably mounted on the brush cutter rotating plate 11. Therefore, even when contact with hard structures such as concrete structures during grass cutting, the recoil is reduced, lessening the burden on the operator.

[0133] Regarding the brush cutter blade 20, by containing steel, the blade is harder than conventionally used resin cords such as nylon cord. Therefore, even though it is rotatably mounted on the brush cutter's rotating plate, it can efficiently cut grass and improve cutting performance.

[0134] The corner section 23 is provided to enhance the cutting ability by coming into contact with the grass during mowing and creating cuts or scratches in the grass. By making the inner angle θ23 of the corner section 23 acute, i.e., less than 90 degrees, it is possible to make cuts or scratches in the grass more easily. (1) Regarding the installation method of the brush cutter blade (1-1) First Configuration Example The brush cutter blade 20 may have a through hole 24 at the first end 21, as shown in Figures 2, 5A, and 5B.

[0135] In this case, the brush cutter may have a further number of pins 51.

[0136] The brush cutter blade 20 may be installed and fixed to the brush cutter rotating plate 11 by a pin 51 inserted into the through hole 24, as shown in Figure 5A.

[0137] The pin 51 is pre-fixed to the brush cutter's rotating plate 11, as shown in Figure 5A. The brush cutter's blade 20 may be installed on the brush cutter's rotating plate 11 by positioning the brush cutter's blade 20 so that the pin 51 is located within the through hole 24.

[0138] Furthermore, as shown in Figure 5B, the pin 51 may be removable from the rotating plate 11 for the brush cutter. In this case, the pin 51 may be insertable into a through hole 24 provided in the brush cutter blade 20 and into a pin insertion hole 111 provided in the rotating plate 11 for the brush cutter so as to penetrate from the first surface 11A to the second surface 11B. For example, the brush cutter blade 20 may be installed on the rotating plate 11 for the brush cutter by inserting the pin 51 into the through hole 24 of the brush cutter blade 20 and the pin insertion hole 111 of the rotating plate for the brush cutter.

[0139] The brush cutter cutter 10 has a pin 51, and the brush cutter blade 20 is installed on the brush cutter rotating plate 11 by the pin 51, making it easy to install and remove the brush cutter blade 20. This improves the work efficiency of installing and replacing the brush cutter blade 20.

[0140] The first configuration example of the brush cutter may further include a clip 52 that is installed on the end 511 along the longitudinal side of the pin 51.

[0141] The clip 52 can be made movable along the double arrow 50 shown in Figures 5A and 5B. By installing the clip 52 on the end 511 of the pin 51, the movement of the brush cutter blade 20 can be restricted, preventing the brush cutter blade 20 from coming off the pin 51.

[0142] As shown in Figure 5B, when the clip 52 is placed on the second surface 11B of the brush cutter's rotating plate 11, the brush cutter's rotating plate 11 may also have a recess 53 for accommodating the clip 52.

[0143] The clip 52 can be installed on the end 511 of the pin 51 and only needs to be able to restrict the movement of the brush cutter blade 20 along the longitudinal side of the pin 51; its shape and other characteristics are not particularly limited. Figure 6 shows a top view of a clip 52, which is one example of the clip's configuration.

[0144] The clip 52 may also have a clamping portion 522 that secures the clip to the pin 51 by clamping onto the pin 51. The shape of the clamping portion 522 is not particularly limited, but for example, as shown in Figure 6, it may have a pair of opposing plate-like bodies that can clamp onto the area where the pin 51 is inserted.

[0145] As shown in Figures 5A, 5B, and 6, the clip 52 may also have an opening 521 along its longitudinal direction so that it can move along the double arrow 50, for example, along the longitudinal direction of the brush cutter blade 20. The size of the opening 521 can be selected to allow, for example, the wall portion 13 of the brush cutter's rotating plate 11 or a pin 131 provided on the brush cutter's rotating plate 11 to be inserted. (1-2) Second Configuration Example As shown in Figure 7, the rotating plate 11 for the brush cutter may have mounting holes 112. Although Figure 7 schematically shows a cross-sectional view along the central axis of one brush cutter blade 20, the rotating plate 11 for the brush cutter may have multiple mounting holes 112 along the outer circumference 110 of the rotating plate 11.

[0146] Furthermore, the brush cutter blade 20 may have an end member 211 provided at the first end 21. Also, the brush cutter blade 20 may have a bent portion 200 positioned between the first end 21 and a second end 22 located opposite the first end 21.

[0147] In this case, the cross-sectional area of ​​the end member 211 in a plane perpendicular to the longitudinal side of the brush cutter blade 20 may be larger than the cross-sectional area of ​​the second end member 22 in a plane perpendicular to the longitudinal side of the brush cutter blade 20. Then, as shown in Figure 7, the brush cutter blade 20 may be inserted into the mounting hole 112 and installed and fixed to the brush cutter rotating plate 11 by the end member 211.

[0148] The mounting hole 112 may be a through hole that penetrates from the first surface 11A to the second surface 11B of the rotating plate 11 for the brush cutter. The mounting hole 112 may have a shape in which the first mounting hole 1121 and the second mounting hole 1122 are connected. The first mounting hole 1121 and the second mounting hole 1122 may differ in size and shape in a cross section perpendicular to the longitudinal side.

[0149] The relationship between the size of the mounting hole 112 and the size of the brush cutter blade 20 has already been explained, so the explanation will be omitted here.

[0150] The brush cutter blade 20 has an end member 211, and by inserting the brush cutter blade 20 into an installation hole 112 provided in the brush cutter rotating plate 11, the brush cutter blade 20 can be installed and fixed to the brush cutter rotating plate 11, making it easy to install and remove the brush cutter blade 20. This improves the work efficiency of installing and replacing the brush cutter blade 20.

[0151] The space between the installation hole 112 and the brush cutter blade 20 may be filled with a filling member or filler having a shape that fits the space. (2) Shape and materials of the rotating plate for the brush cutter The rotating plate 11 for the brush cutter may have a disc shape, as shown in Figure 1. (Opening) The rotating plate 11 for the brush cutter may have an opening 12 in its center for installation on a brush cutter. The opening 12 may be positioned to include the center of the rotating plate 11. The opening 12 may be a through hole that penetrates from the first surface 11A, which is the main surface of the rotating plate 11, to the second surface 11B, which is located opposite the first surface 11A. The shape and size of the opening 12 are not particularly limited and can be selected according to the specifications of the brush cutter to which it is installed. (wall) The rotating plate 11 for the brush cutter may have a wall portion 13 on the first surface 11A of the rotating plate 11 on which the brush cutter blade 20 is mounted.

[0152] Here, the end of the brush cutter blade 20 located on the first surface 11A, along its longitudinal direction and opposite to the second end 22, is defined as the third end 210. As shown in Figures 5A and 5B, when the entire brush cutter blade 20 is located on the first surface 11A, the first end 21 becomes the third end 210. Also, as shown in Figure 7, when the first end 21 is located on the second surface 11B, the area between the first end 21 and the second end 22, for example, the bent portion 200, becomes the third end 210.

[0153] The wall portion 13 may be positioned to face at least a portion of the third end portion 210.

[0154] The brush cutter blade 20 is mounted on the brush cutter rotating plate 11 so as to be rotatable around its first end 21. However, when mowing grass using the brush cutter cutter 10, grass may get tangled around the rotating part, requiring grass removal or other maintenance.

[0155] However, since the rotating plate 11 for the brush cutter has a wall portion 13 positioned to face at least a part of the third end portion 210 of the brush cutter blade 20, it is possible to reduce the amount of grass that gets tangled around the third end portion 210 of the brush cutter blade 20 on the first surface 11A of the rotating plate 11. Therefore, when mowing grass using the brush cutter cutter of this embodiment, the frequency of tasks such as removing tangled grass can be reduced. In other words, wasted time required for tasks other than mowing can be eliminated, and efficiency can be increased.

[0156] As shown in Figure 1, the wall portion 13 may have a continuous circular shape that follows the outer circumference of the rotating plate 11 for the brush cutter. Alternatively, the wall portion 13 may be provided discontinuously for each brush cutter blade 20.

[0157] The shape of the wall portion 13 is not particularly limited. The shape of the wall portion 13 can be selected so as not to obstruct the rotation of the brush cutter blade 20 and to shorten the distance between it and the third end portion 210 of the brush cutter blade 20.

[0158] As shown in Figure 8A, the wall portion 13 may have a recess 81 in the portion facing the third end 210 of the brush cutter blade 20. The shape of the recess 81 is not particularly limited, and when viewed from above in the vertical direction relative to the first surface 11A of the brush cutter rotating plate 11, it may have an arc shape as shown in Figure 8A.

[0159] The shape of the recess 81 is not limited to the form shown in Figure 8A, and may be a polygonal shape such as a quadrilateral as shown in Figure 9A. If the recess 81 has a polygonal shape, the corners 810 may be chamfered, such as a C-chamfer or R-chamfer, as shown in Figures 9B and 9C.

[0160] Furthermore, the shape of the recess 81 can also be semicircular, as shown in Figures 9D and 9E. As shown in Figure 9E, the semicircular shape includes semicircles of circles other than perfect circles, such as semi-ellipses.

[0161] The wall portion 13 may have a gap 82 (see Figures 8A and 8B) between it and the third end portion 210 of the brush cutter blade 20 so as not to obstruct the rotation of the brush cutter blade 20. The length L82 of the gap 82 between the wall portion 13 and the third end portion 210 of the brush cutter blade 20 is not particularly limited and may be, for example, 0.1 mm or more and 2 mm or less, or 0.3 mm or more and 1.2 mm or less.

[0162] By setting the length L82 of the gap 82 to 0.1 mm or more, it is possible to prevent obstruction of rotation around the first end 21 of the brush cutter blade 20. Furthermore, by setting the length L82 of the gap 82 to 2 mm or less, it is possible to particularly prevent grass from wrapping around the third end 210 of the brush cutter blade 20.

[0163] Length L82 represents the shortest distance between the contour line C20, which is located at the outermost circumference when the brush cutter blade 20 is rotated along the double arrow 101, and the wall portion 13.

[0164] The third end 210 of the brush cutter blade 20 may have an arc shape as shown in Figure 8B, rather than a straight shape as shown in Figure 8A. When the third end 210 of the brush cutter blade 20 has an arc shape, the contour line C20 may coincide with the shape of the third end 210 of the brush cutter blade 20.

[0165] The wall portion 13 may be detachable from the rotating plate 11 for the brush cutter, or it may be integrated with the rotating plate 11 for the brush cutter. (3) Materials for the rotating plate of the brush cutter The material of the rotating plate 11 for the brush cutter is not particularly limited and may be various resins, metals, etc. The wall portion 13 may be made of a different material from the rotating plate 11 for the brush cutter.

[0166] Examples of resins include one or more selected from polyethylene resin, polyolefin resins such as polypropylene resin, polyoxymethylene resin (also called POM resin or polyacetal resin), polycarbonate resin, MC nylon resin (monomer cast nylon resin), and fiber-reinforced plastics.

[0167] Examples of metals include one or more selected from aluminum alloys, magnesium alloys, etc.

[0168] The material of the brush cutter's rotating plate 11 may include, for example, resin. By including resin in the brush cutter's rotating plate 11, the brush cutter's rotating plate 11 and the brush cutter's cutter 10 can be made lighter, reducing the burden on the operator when mowing grass. (4) About lawnmowers The brush cutter 10 of this embodiment can be used by attaching it to a grass trimmer.

[0169] Figure 10 shows a perspective view of a brush cutter 90 equipped with a brush cutter cutter 10.

[0170] The brush cutter 10 can be installed at the end of the main pipe 91 of the grass trimmer 90.

[0171] The main pipe 91 of the brush cutter 90 may have a handle 92 and a grip 921 installed at the end of the handle 92.

[0172] Furthermore, the brush cutter 90 may have a drive device 93 for rotating the brush cutter 10, and a debris guard 94 to prevent the grass cut by the brush cutter 10 from scattering to the operator.

[0173] The drive unit 93 can be an engine or a motor. Therefore, the lawnmower 90 may also have a tank for storing fuel for the engine or a battery for supplying electricity to the motor.

[0174] The lawnmower 90 shown in Figure 10 is only schematically represented to illustrate the overall structure, and therefore the description is simplified. However, it may also have various switches for turning the lawnmower 90 on and off, a gearbox, etc.

[0175] Although embodiments have been described in detail above, the invention is not limited to any particular embodiment, and various modifications and changes are possible within the scope described in the claims. [Examples]

[0176] The present invention will be described with specific examples below, but it is not limited to these examples. (1) Evaluation method We mowed oats sown on a rectangular plot of land measuring 1.5m x 29m, and calculated the working time / dry weight per unit area by dividing the working time (the time required to mow) by the dry weight after drying.

[0177] The dry weight after drying refers to the dry weight of grass in a 50cm square area within the mowed region, and corresponds to the grass density. The dry weight after drying was measured after drying the mowed grass in a 50cm square area at 105°C for 48 hours in an air atmosphere.

[0178] The ratio of working time to dry weight per unit area removes the effect of grass density by dividing the working time by the dry weight per unit area. A lower ratio of working time to dry weight per unit area indicates better mowing capacity.

[0179] To avoid discrepancies between workers, the evaluations were conducted under identical conditions by both the first and second experimenters, except for the difference in the experimenters themselves. Therefore, Figure 11, which shows the evaluations, displays the results for each experimenter separately using dotted and solid lines. The dotted line represents the results from the first experimenter, and the solid line represents the results from the second experimenter. (2) Regarding brush cutter blades and brush cutter cutters This section describes blades and cutters for brush cutters. Experimental Examples 1, 3, and 4 are comparative examples, and Experimental Example 2 is an example. [Experimental Example 1] I used a carbide-tipped saw blade as a cutter for my brush cutter to mow the grass.

[0180] Since carbide-tipped saw blades have been used as cutters for brush cutters for a long time, a detailed explanation will be omitted, but they are metal discs with wavy blades on their outer circumference.

[0181] Because carbide-tipped saw blades are metal cutters, they are known for their high cutting capacity. However, carbide-tipped saw blades can break off and scatter during use, and they also have problems in terms of workability, such as causing strong recoil in the brush cutter when they come into contact with hard structures such as concrete or stones.

[0182] The evaluation results are shown in Figure 11. [Experimental Example 2] Grass cutting was performed using the brush cutter 10 shown in Figure 1.

[0183] The brush cutter 10 has six brush cutter blades 20 installed along the outer circumference of the brush cutter rotating plate 11, such that the distance between the first ends 21 of the brush cutter blades 20 is equal.

[0184] As shown in Figure 2, the brush cutter blade 20 has a rod-like shape, and in a cross section perpendicular to its length, as shown in Figure 3A, the first side surface 20A has one acute corner 23 with an internal angle θ23 of 38.5 degrees.

[0185] The top of the corner 23 was chamfered in a curved shape, as shown in Figure 3B, and the radius of curvature R23 was 0.3 mm. The brush cutter blade 20 had a pentagonal shape in the cross section perpendicular to its longitudinal side.

[0186] The material used for the brush cutter blade 20 was SWRH 72B, a hard steel wire with a carbon content of 0.69% by mass or more and 0.76% by mass or less, and its yield strength was 1230 MPa.

[0187] The maximum width (W20) of the brush cutter blade body 20 was set to 6 mm, the maximum thickness (T20) to 3.2 mm, and the maximum length (L20) to 60 mm.

[0188] The brush cutter blade 20 has a through hole 24 at its first end 21. As shown in Figure 5A, the brush cutter blade 20 is installed on the brush cutter rotating plate 11 by inserting a pin 51 provided on the brush cutter rotating plate 11 into the through hole 24. At this time, a clip 52 is attached to the end 511 along the longitudinal side of the pin 51.

[0189] The evaluation results are shown in Figure 11.

[0190] In this experiment, during grass cutting, the rotating plate 11 attached to the brush cutter was rotated at a speed of 6500 rpm and moved to a collision velocity of 1 m / s, causing the brush cutter blade 20 to contact a rigid 15 mm thick acrylic plate once. However, because the brush cutter blade 20 rotated around the pin 51, no strong recoil occurred in the brush cutter. In other words, it was confirmed that the recoil known as kickback, which is a problem when using a saw blade, did not occur. Furthermore, it was confirmed that grass cutting could be continued after moving the brush cutter away from the acrylic plate that had made contact. [Experimental Example 3] As the brush cutter blade 20, a brush cutter blade 205 having a rectangular cross-section perpendicular to its longitudinal side was used. Therefore, the brush cutter blade 20 used in Experimental Example 3 does not have any acute angles in the cross-section perpendicular to its longitudinal side. SWRS 82A, a type of piano wire, was used as the material for the brush cutter blade 20, and its yield strength was 1600 MPa. Except for the points mentioned above, grass cutting was performed using a brush cutter cutter with the same configuration as the brush cutter cutter 10 in Experimental Example 2.

[0191] The maximum width (W20) of the brush cutter blade body 20 was set to 3.6 mm, the maximum thickness (T20) to 2.3 mm, and the maximum length (L20) to 60 mm.

[0192] The evaluation results are shown in Figure 11. [Experimental Example 4] I used a two-pronged nylon cord as a cutter for my brush cutter to mow the grass.

[0193] Nylon cord has been used as a cutter for brush cutters for a long time, so a detailed explanation will be omitted, but the blade part is made of nylon cord. The cord used has a circular shape with a cross-section perpendicular to its length of φ2.7 mm. The two-cord nylon cord means that two cords can be pulled out from the base, and the grass can be cut by the rotation of the two pulled-out cords around the base.

[0194] The evaluation results are shown in Figure 11.

[0195] As shown in Figure 11, in Experimental Example 2, which is a brush cutter blade or brush cutter according to one aspect of the present disclosure, it was confirmed that it has the same cutting ability as in Experimental Example 1, which uses a conventional saw blade known to have excellent cutting ability.

[0196] In other words, it was confirmed that the blade body for a brush cutter and the cutter for a brush cutter according to one aspect of this disclosure have excellent cutting capabilities.

[0197] On the other hand, in Experimental Example 3, which used a brush cutter blade 20 that contains steel but has a rectangular cross-section perpendicular to its longitudinal side and does not have sharp corners in the cross-section perpendicular to its longitudinal side, it was confirmed that the dry weight per unit area of ​​working time was significantly higher. Therefore, it was confirmed that the brush cutter blade according to one embodiment of the present disclosure, and the brush cutter in Experimental Example 2, have superior cutting ability compared to Experimental Example 3, which does not have the predetermined corners, even though they are both steel wire blades.

[0198] In Experiment Example 4, which used nylon cord, the dry weight per unit area of ​​working time was significantly increased. Compared to Experiment Example 4, it was confirmed that the brush cutter blade and brush cutter cutter according to one embodiment of the present disclosure in Experiment Example 2 exhibit superior cutting ability. [Explanation of symbols]

[0199] 10. Brush cutter cutter 101 Double-headed arrow 11 Rotary plate for brush cutter 110 Outer circumference 111 Pin insertion hole 112 Installation hole 1121 1st installation hole 1122 2nd installation hole 112A opening 11A 1st page 11B 2nd side 12 Openings 13 Wall 131 pins B Block Arrow 20 Brush cutter blades 201 Brush cutter blade 202 Brush cutter blade 203 Brush cutter blade 204 Brush cutter blade 205 Brush cutter blade 20A First side 20B 2nd side 20C top surface 20D Bottom 21 First end 200 Bending section 210 Third end 211 End members 22 Second end 23 corners 24 Through holes L20 Maximum length W20 Maximum width T20 Maximum Thickness D area E straight line R23 radius of curvature θ23 interior angle L23 Length 50 Double-headed arrow 51 pins 511 End 52 clips 521 Opening 522 Clamping part 53 Recess L70 Length 81 recess 810 corner 82 gaps L82 Length 90 Lawn Mower 91 Main pipe 92 handle 921 Grip 93 Drive unit 94. Splash guard cover

Claims

1. A brush cutter blade body that is installed on a rotating plate for a brush cutter, The aforementioned brush cutter blade contains steel, has a rod-like shape, and in a cross section perpendicular to its length, has at least one corner portion with an acute inner angle.

2. The brush cutter blade according to claim 1, wherein in the cross-section, the first side surface and the second side surface located opposite the first side surface each have the corner portion.

3. The brush cutter blade according to claim 1 or claim 2, wherein the inner angle of the corner portion is 15 degrees or more and 75 degrees or less.

4. The brush cutter blade according to claim 1 or claim 2, wherein the corner portion includes a curve with a radius of curvature of 0.1 mm or more and 1 mm or less, or a straight line with a length of 0.1 mm or more and 1 mm or less.

5. The brush cutter blade according to claim 1 or claim 2, wherein in the cross-section, the corner portion is located at a location other than the center line of the thickness.

6. The brush cutter blade according to claim 1 or claim 2, wherein the maximum thickness in the cross-section is 1 mm or more and 7 mm or less.

7. The brush cutter blade according to claim 1 or claim 2, wherein the steel contains one or more selected from carbon steel, stainless steel, and low alloy steel, and the carbon content of the carbon steel is 0.5% by mass or more.

8. A brush cutter blade according to claim 1 or claim 2, wherein the yield strength is 1000 MPa or more.

9. The brush cutter blade according to claim 1 or claim 2, wherein the brush cutter blade has a through hole at a first end along its longitudinal direction that is in line with the thickness of the brush cutter blade.

10. The aforementioned brush cutter blade body includes an end member provided at a first end along its longitudinal direction, It has a bent portion positioned between the first end and the second end located opposite the first end, The brush cutter blade according to claim 1 or claim 2, wherein the cross-sectional area of ​​the end member in a plane perpendicular to the longitudinal side of the brush cutter blade is larger than the cross-sectional area of ​​the second end in a plane perpendicular to the longitudinal side of the brush cutter blade.

11. A rotating plate for a brush cutter having a first surface and a second surface located opposite the first surface, It has a plurality of brush cutter blades arranged along the outer circumference of the rotating plate for the brush cutter, The aforementioned brush cutter blade contains steel, has a rod-like shape, and in a cross-section perpendicular to its length, has at least one corner with an acute inner angle. The brush cutter blade has a first end along its length and a second end located opposite the first end. A brush cutter, wherein at least a portion of it is located on the first surface and is rotatably mounted on the rotating plate for the brush cutter with respect to the first end.

12. It has multiple pins, The brush cutter blade has a through hole at its first end, The brush cutter according to claim 11, wherein the blade body for the brush cutter is installed on the rotating plate for the brush cutter by the pin inserted into the through hole.

13. The brush cutter according to claim 12, further comprising a clip installed at the end of the pin along its longitudinal side.

14. The rotating plate for the brush cutter has a plurality of mounting holes along its outer circumference, The brush cutter blade body includes an end member provided at the first end, It has a bent portion positioned between the first end and the second end, The cross-sectional area of ​​the end member in a plane perpendicular to the longitudinal side of the brush cutter blade is larger than the cross-sectional area of ​​the second end in a plane perpendicular to the longitudinal side of the brush cutter blade. The aforementioned mounting hole penetrates from the first surface to the second surface. The brush cutter cutter according to claim 11, wherein the blade body for the brush cutter is inserted into the mounting hole and is installed on the rotating plate for the brush cutter by the end member.

15. The rotating plate for the brush cutter has a wall portion on its first surface, When the end located on the first surface, along the longitudinal direction of the brush cutter blade, and opposite to the second end, is defined as the third end, The brush cutter according to any one of claims 11 to 14, wherein the wall portion is arranged to face at least a portion of the third end.

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