Rotary grass cutting blade

Abstract

To provide a rotary mowing blade which has a recess space where a mowing blade is removed, between many adjacent mowing blades which are provided on a peripheral edge of a disk-shaped mowing blade main body, in which on a recess mowing function edge and a mowing function edge of a mowing blade provided an edge of a bottom side of the recess space, a cutting blade formed of a rear blade or a front blade is formed, for exhibiting a mowing function by both of the front and rear blades.SOLUTION: A rotary mowing blade is configured so that, in a disk-shaped mowing blade main body in which on a peripheral edge part, many mowing blades which are formed into a substantially irregular shape are formed for mowing weed, and mows weed by rotation, the rotary mowing blade comprises: many adjacent mowing blades which are formed on a peripheral edge of the disk-shaped mowing blade main body; recess spaces formed between the many mowing blades; recess mowing function edges provided on bottom side edge parts of the recess spaces; and mowing function edges provided on a tip edge part / rear edge part of each of the many mowing blades in a blade rotary direction.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, plants such as vines and tall foaming weeds are easy to reproduce, and when they grow in a field or agricultural soil, they hinder farming operations and other labor, so they are cut and removed with a brush cutter to make the ground.

[0003] These brush cutters are equipped with a disc-shaped grass cutting blade rotatably on the output shaft provided in a drive source such as an engine to cut weeds and vines.

[0004] Such a grass cutting blade projects a blade part on the periphery of a disc-shaped metal grass cutting blade body, and cuts vines and tall weeds with a cutting blade body projected on the edge of the blade part by rotation.

[0005] However, when cutting weeds with a grass cutting blade in a place where tall weeds and vines have grown thickly, the blade body may be damaged by contact with crushed stones or the like, or may be dulled and the cutting edge may deteriorate, so it cannot be used continuously for a long time. In addition, depending on the weeds to be cut, the length of the cut weeds becomes longer due to the tall weeds, so the cut weeds accumulate, and a great deal of labor must be spent on cleaning the ground after the cutting operation and disposing of the accumulated weeds.

[0006] Thus, the grass cutting blade of the brush cutter is usually called a chipper saw, and the chipper saw is replaced as maintenance. That is, when the above-mentioned grass cutting blade, which is a chipper saw, deteriorates, it is replaced with a new chipper saw, and for example, a grass cutting blade as described in Patent Document 1 is used.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] However, in areas overgrown with tall weeds and vines, it is difficult to see obstacles such as crushed stone, making damage and deterioration of the blade unavoidable. Furthermore, if a grass cutting blade is used for extended periods with damage or deterioration, its sharpness will decrease. When a grass cutting blade becomes dull, it becomes difficult to cut large amounts of weeds simultaneously during mowing, reducing work efficiency.

[0009] Furthermore, in order to improve the sharpness of the cutting blade, the tip of the saw blade is shaped with small pieces called tips protruding from the edge of the blade. However, these tips often chip off due to continuous cutting of weeds or collisions with loose stones on the ground. When the tips on the blade chip off, it significantly reduces the sharpness of the cutting blade.

[0010] The present invention has been made in view of the above-mentioned problems, and aims to provide a grass cutting blade that enhances the cutting function by performing a certain process on the cutting blade, that is, by providing recessed spaces between a number of cutting blades provided on the peripheral edge of the disc-shaped grass cutting blade body, and by forming a recessed cutting function edge on the bottom edge of the recessed space and a cutting function edge provided on the front edge and rear edge in the direction of blade rotation of the number of cutting blades. Furthermore, the cutting function edge of the cutting blade is a cutting blade consisting of a back blade and a front blade, and the grass cutting blade body can be used by reversing it, and the grass cutting function can be performed on either side, so that even if the cutting blade becomes dull, it can be reversed and the grass cutting work can be continued with good cutting performance on either side. [Means for solving the problem]

[0011] To solve the above-mentioned conventional problems, the present invention provides a disc-shaped grass cutting blade body that cuts weeds by rotation, having a plurality of substantially uneven cutting blades formed on its periphery, characterized in that it comprises a plurality of adjacent cutting blades formed on the periphery of the disc-shaped grass cutting blade body, recessed spaces formed between the plurality of cutting blades, recessed cutting function edges provided on the bottom edge of the recessed spaces, and cutting function edges provided on the front edge and rear edge of the plurality of cutting blades in the direction of blade rotation.

[0012] Furthermore, the recessed cutting edge and the cutting edge are characterized by having a cutting blade with a back blade and a front blade that can be used by reversing the grass cutting blade body.

[0013] Furthermore, the cutting blade is characterized by having a series of roughly V-shaped chip blade bodies having the cutting blades, and a cutting blade recess formed in the approximate central part of the cutting blade, which is deeper than the blade body recess, which is the valley of the continuously formed chip blade body, but shallower than the recess space. [Effects of the Invention]

[0014] According to the present invention, by partially removing the cutting blades between the numerous adjacent cutting blades formed on the periphery of the grass cutting blade body to create recessed spaces, the stems of weeds can be easily taken into the recessed spaces, making it easier to cut weeds. Furthermore, by providing cutting blades on both the front and back sides and allowing them to be reversed for use, the cutting function edges of the recessed spaces and the numerous cutting blades, where the grass cutting function is most effective, can be reversed when the cutting performance of the front or back side of the grass cutting blades deteriorates, thereby extending the sharpness of the grass cutting blades. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing the rotary grass cutting blade according to the present invention attached to a brush cutter. [Figure 2] This is an exploded perspective view illustrating a method for attaching the rotary grass cutting blade according to the present invention to a brush cutter. [Figure 3]It is a plan view for explaining the configuration of the rotary grass cutting blade according to the first embodiment of the present invention. [Figure 4] It is a bottom view for explaining the configuration of the rotary grass cutting blade according to the first embodiment of the present invention. [Figure 5] It is an end view for explaining the cutting edge of the rotary grass cutting blade according to the present invention. [Figure 6] It is a plan view and a bottom view for explaining the configuration of the rotary grass cutting blade according to the second embodiment of the present invention. [Figure 7] It is a plan view and a bottom view for explaining the configuration of the rotary grass cutting blade according to the third embodiment of the present invention. [Figure 8] It is a plan view and a bottom view for explaining the configuration of the rotary grass cutting blade according to the fourth embodiment of the present invention. [Figure 9] It is a plan view for explaining the configuration of the rotary grass cutting blade according to another embodiment of the present invention. [Figure 10] It is an end view for explaining the cutting blade of the rotary grass cutting blade according to another embodiment of the present invention. [Figure 11] It is a plan view for explaining the configuration of the rotary grass cutting blade according to another embodiment of the present invention. [Figure 12] It is an end view for explaining the cutting blade of the rotary grass cutting blade according to another embodiment of the present invention.

Mode for Carrying Out the Invention

[0016] The gist of this invention is that in a disk-shaped grass cutting blade body that forms a large number of cutting blades with a substantially concave and convex shape on the peripheral portion and cuts weeds by rotation, the adjacent large number of cutting blades formed on the peripheral portion of the disk-shaped grass cutting blade body, the concave space formed between the large number of cutting blades, the concave cutting function edge provided at the bottom edge of the concave space, and the cutting function edges provided at the leading edge and the trailing edge in the blade rotation direction of the large number of cutting blades.

[0017] Further, the concave cutting function edge and the cutting function edge are cutting edges that form a back blade and a front blade that can be used with the grass cutting blade body turned inside out.

[0018] Furthermore, the cutting blade is formed by continuously creating a roughly V-shaped chip blade body having the cutting blade, and a cutting blade recess is formed in the roughly central part of the cutting blade, which is deeper than the blade body recess, which is the valley of the continuously formed chip blade body, but shallower than the recess space.

[0019] Hereinafter, embodiments of the rotary grass cutting blade M according to the present invention will be described in detail with reference to the attached drawings. Figure 1 is a perspective view showing the rotary grass cutting blade M according to the present invention attached to a brush cutter 40. Figure 2 is an exploded perspective view illustrating how to attach the rotary grass cutting blade M according to the present invention to a brush cutter 40. Figure 3 is a plan view illustrating the configuration of the rotary grass cutting blade M according to the first embodiment of the present invention. Figure 4 is a bottom view illustrating the configuration of the rotary grass cutting blade M according to the first embodiment of the present invention. Figure 5 is an end view illustrating the cutting blade of the rotary grass cutting blade M according to the present invention, where (a) is the end view along line AA shown in Figure 3, (b) is the end view along line BB shown in Figure 3, and (c) is the end view along line CC shown in Figure 3. Figure 6 is a diagram illustrating the configuration of the rotary grass cutting blade M according to the second embodiment of the present invention, where (a) is a plan view and (b) is a bottom view. Figure 7 is a diagram illustrating the configuration of a rotary grass cutting blade M according to a third embodiment of the present invention, where (a) is a plan view and (b) is a bottom view. Figure 8 is a diagram illustrating the configuration of a rotary grass cutting blade M according to a fourth embodiment of the present invention, where (a) is a plan view and (b) is a bottom view. Figure 9 is a plan view illustrating the configuration of a rotary grass cutting blade M according to another embodiment of the present invention. Figure 10 is an end view illustrating the cutting blade of a rotary grass cutting blade M according to another embodiment of the present invention, where (a) is an end view of the DD line shown in Figure 9 and (b) is an end view of the EE line shown in Figure 9. Figure 11 is a plan view illustrating the configuration of a rotary grass cutting blade M according to another embodiment of the present invention. Figure 12 is an end view illustrating the cutting blade of a rotary grass cutting blade according to another embodiment of the present invention, where (a) is a bottom view. 11 (b) is the FF line end view shown in the diagram. 11 (c) is the end view of the GG line described in Figure 11 The HH line cross-section diagrams described are shown below.

[0020] The rotary grass cutting blade M according to the present invention is used to cut and clear away weeds, vines, etc., and is mounted on the output shaft 41 of the brush cutter 40, as shown in Figure 1.

[0021] For example, it is mounted on the output shaft 41 of a drive source such as an engine and cuts weeds into fine pieces while rotating. The main components of the mounting part of the brush cutter 40 are as shown in Figure 2, consisting of an output shaft 41 having a threaded groove at the rod-shaped tip, an output shaft cover 42 that covers the output shaft 41, mounting bolts 43 corresponding to the threaded groove of the output shaft 41, and a bracket 44 interposed between the output shaft 41 and the mounting bolts 43.

[0022] As described above, the output shaft 41 rotates due to the driving force from the drive source of the brush cutter 40, and the area near the lower end of the output shaft 41 is cylindrical and has a screw groove inside into which a mounting bolt 43 can be screwed.

[0023] The bracket 44 is a circular member having a larger area than the diameter of the mounting hole 12 for the rotary grass cutting blade M described later, and has a through hole in its center through which the mounting bolt 43 can be inserted.

[0024] The rotary grass cutting blade M consists of a base disc-shaped grass cutting blade body 10 that holds the cutting blades 20, and a plurality of cutting blades 20 that protrude from the peripheral edge 11 of the grass cutting blade body 10. In addition, a recessed space 30 is formed between the plurality of cutting blades 20 by removing some of the cutting blades 20.

[0025] The rotating grass cutting blade M consists of a blade body 10 and a cutting blade 20, which are made of metal plate-like members such as steel plates and have the same thickness as a known ordinary saw blade. Therefore, a certain amount of wear and deterioration occurs, reducing the cutting function, and the rotating grass cutting blade M can be replaced, allowing for maintenance such as saw blade replacement.

[0026] As shown in Figure 2, the grass cutting blade body 10 is formed in a roughly circular plate shape, and a mounting hole 12 for attaching it to the output shaft 41 of the brush cutter 40 is provided in the center of the circular plate. The method of attaching it to the brush cutter 40 is to insert the output shaft 41 from above the mounting hole 12, and then, while holding the grass cutting blade body 10 in place with the bracket 44 from below, screw the mounting bolt 43 into the threaded groove of the output shaft 41 to attach it.

[0027] The output shaft 41 of the brush cutter 40 is connected to the drive source of the brush cutter 40 and receives rotational power, functioning as the rotational output shaft of the rotary grass cutting blade M. That is, the grass cutting blade body 10 mounted on the output shaft 41 of the brush cutter 40 rotates counterclockwise (in the direction of the arrows shown in Figures 1, 3, and 4, hereinafter referred to as the "blade rotation direction").

[0028] In addition, the grass cutting blade body 10 may have multiple weight-reducing holes drilled outside the mounting holes 12, separate from the mounting holes 12, in order to reduce weight.

[0029] The configuration of the cutting blade 20 and the recessed space 30, which are the essence of the present invention, will now be described in detail. As shown in Figure 3, the basic configuration of the cutting blade 20 is that numerous recesses are formed on the peripheral edge 11 of the grass cutting blade body 10 at regular intervals. As a result, recessed spaces 30 are formed between adjacent cutting blades 20.

[0030] The upper half of the cutting blade 20 has 3 to 6 chipped blade bodies 23, which are formed in a continuous, mountain-like shape. As a result, between adjacent chipped blade bodies 23, a blade recess 23a is formed with a depth of 1 / 2 to 1 / 3 of the height of the cutting blade 20.

[0031] The edges on both sides of each chip blade 23 are cutter function edges 21, with a cutting blade 22 forming a back blade 22a on the back surface of the leading edge in the direction of blade rotation, and a cutting blade 22 forming a front blade 22b on the front surface of the trailing edge in the direction of blade rotation. In addition, the leading edge and trailing edge of the multiple chip blades 23 in the direction of blade rotation, that is, the leading edge and trailing edge of the cutting blade 20, are longitudinal cutting blades 22 that extend to the bottom edge of the recessed space 30.

[0032] The recessed space 30 formed between the multiple cutting blades 20 functions as a space for capturing weeds during weed cutting. The stems and leaves of weeds are captured in this space and cut by the cutting blade 22 of the cutting blade 20 located on the upstream side in the direction of blade rotation.

[0033] Furthermore, the bottom edge of the recessed space 30 is designated as the recessed cutting function edge 31, and cutting blades 22 are formed on both the front and back surfaces. In other words, when weeds are mowed, the weeds taken into the recessed space 30 are cut by the cutting blades 22 provided on the recessed cutting function edge 31 and the extended cutting function edge 21.

[0034] When the rotary grass cutting blade M is attached to the brush cutter 40 with the blade body 10 facing outwards as usual, the back blade 22a of the cutting function edge 21, which is the leading edge in the direction of blade rotation, primarily cuts weeds.

[0035] Furthermore, when the grass cutting blade body 10 is mounted facing up on the brush cutter 40, the front blade 22b, which is located on the rear edge side in the direction of blade rotation, can function as a cutting blade 22 to cut weeds when the grass cutting blade body 10 is mounted upside down. In other words, when the grass cutting blade body 10 is mounted facing down, the front blade 22b becomes the front edge in the direction of blade rotation and can take over from the back blade 22a when the grass cutting blade body 10 is facing up and primarily cut weeds.

[0036] Furthermore, the recessed cutting edge portion 31 of the recessed space 30 has blades on both sides so that it functions as a cutting blade 22 whether it is the front or back side when the grass cutting blade body 10 is used with its front or back side reversed. In other words, the rotary grass cutting blade M according to the present invention has substantially the same shape in plan view and bottom view, that is, a shape that is symmetrical on both sides.

[0037] Therefore, the rotary grass cutting blade M has cutting blades 22 on both sides, so that if the cutting performance on one side deteriorates, it can be reversed and attached to the brush cutter 40 to maintain sharpness even during long work sessions. In addition, the cutting blades 22 (back blade 22a and front blade 22b) of the chip blade body 23 have hard small pieces called chips 23b formed on them to improve sharpness.

[0038] Furthermore, a roughly rectangular notch 30a can be formed in the approximate center of the cutting blade 20 of the rotary grass cutting blade M. This notch is deeper than or to the depth of the blade body recess 23a of the tip blade body 23, but shallower than the depth of the recess space 30. Specifically, as shown in Figures 3 and 4, when there are four tip blade bodies 23, two tip blade bodies 23 are placed on each side of the cutting blade notch 30a.

[0039] Furthermore, the cutting blade recess 30a is located to the right when the grass cutting blade body 10 is viewed from the surface (plan view). After the rotational direction side of The front blade 22b is attached to the edge, left After the rotational direction side of A back blade 22a is provided on the edge. In addition, cutting blades 22 are provided on both the front and back surfaces of the bottom. That is, the cutting blades 22 provided on the left and right side edges of the recessed space 30 and the cutting blades 22 provided on the bottom teeth It has a similar configuration. 30a Similar to the recessed space 30 of the rotary grass cutting blade M, this can contribute to capturing weeds within the space.

[0040] The following describes in detail, based on the drawings, the technical features of the grass cutting blade body 10 described above, namely the cutting blade 22 (back blade 22a, front blade 22b), the blade body recess 23a, the cutting blade recess 30a, and the recess space 30, as modified forms thereof, as Examples 1 to 4.

[0041] [First Embodiment] As shown in Figures 3 and 4, the rotary grass cutting blade M according to the first embodiment has four cutting blades 20, each having four mountain-shaped chip blades 23 formed on the peripheral edge 11 of the grass cutting blade body 10. Furthermore, each of the four cutting blades 20 is provided on the peripheral edge 11 of the grass cutting blade body 10 at equal intervals, and the space between the cutting blades 20 is a recessed space 30.

[0042] Specifically, the cutting blade 20 has a cutting blade recess 30a located approximately in the center of the four chip blade bodies 23. In other words, when the rotary grass cutting blade M is viewed in plan, two chip blade bodies 23 are formed in a row on each side of the cutting blade recess 30a.

[0043] The tip blade body 23 is formed in a continuous V-shape, creating a blade body recess 23a which forms a valley. The cutting blade recess 30a is formed with a depth shallower than the depth of the recess space 30 and deeper than the depth of the blade body recess 23a. In other words, the depth relationship of each recess (recess space 30, cutting blade recess 30a, and blade body recess 23a) is recess space 30 > cutting blade recess 30a > blade body recess 23a.

[0044] The cutting blade 22, which is provided for the rotary grass cutting blade M to actually cut weeds, is formed in the cutting function edge 21 of the cutting blade 20 and the recessed cutting function edge 31 of the recessed space 30, as shown in Figures 3 to 5.

[0045] The cutting edge portion 21 of the cutting blade 20 corresponds to the front edge and rear edge of each tip blade 23 in the direction of blade rotation when the grass cutting blade body 10 is viewed from the front (plan view). As shown in the end view in Figures 5(a) and 5(b), the front edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a back blade 22a, on the back surface of the grass cutting blade body 10. The rear edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a front blade 22b, on the surface of the grass cutting blade body 10.

[0046] Furthermore, the leading edge and trailing edge of the cutting blade 20 in the direction of blade rotation are long cutting blades 22 that extend to the bottom of the recessed space 30. Also, of the four chip blade bodies 23, the trailing edge of the second chip blade body 23 in the direction of blade rotation and the leading edge of the third chip blade body 23 in the direction of blade rotation are long cutting blades 22 that extend to the bottom of the cutting blade recess 30a. In other words, in a plan view of the rotary grass cutting blade M, the left and right edges of the recessed space 30 and the cutting blade recess 30a are cutting blades 22 that extend to the bottom of each recess.

[0047] Furthermore, the tips of the four carbide-tipped blade bodies 23 of the cutting blade 20 are equipped with tips 23b, which enhances the cutting performance of the cutting blade 22. This configuration is similar to that of a carbide-tipped saw blade.

[0048] As shown in Figures 3, 4, and 5(c), the bottom of the recessed space 30 and the bottom of the cutting blade recess 30a are configured as recessed cutting function edges 31, with cutting blades 22 that can cut on both the front and back sides of the grass cutting blade body 10. In other words, when mowing, the recessed space 30 and the cutting blade recess 30a trap weeds in each other's recessed spaces and can be cut by the cutting blades 22 (back blade 22a or front blade 22b) formed on the cutting function edge 21 of the cutting blade 20 and the cutting blades 22 formed on the bottom (recessed cutting function edge 31).

[0049] Furthermore, the rotary grass cutting blade M according to the first embodiment has a back blade 22a and a front blade 22b formed on the cutting edge 21, so that even if the grass cutting blade body 10 is reversed and attached to the brush cutter 40, the weed cutting function will not be hindered. Therefore, for example, when using the grass cutting blade body 10 with the front side facing outwards, if the sharpness of the back blade 22a that cuts weeds decreases, the grass cutting blade body 10 can be reversed, and the cutting work can be continued with good cutting performance using the front blade 22b.

[0050] [Second Example] As shown in Figure 6, the rotary grass cutting blade M according to the second embodiment has four cutting blades 20, each having six mountain-shaped chip blades 23 formed on the peripheral edge 11 of the grass cutting blade body 10. Furthermore, each of the four cutting blades 20 is provided at equal intervals on the peripheral edge 11 of the grass cutting blade body 10, and the spaces between the cutting blades 20 are recessed spaces 30.

[0051] Specifically, the cutting blade 20 has a cutting blade recess 30a located approximately in the center of the six chip blade bodies 23. In other words, when the rotary grass cutting blade M is viewed in plan, three chip blade bodies 23 are formed in a row on each side of the cutting blade recess 30a.

[0052] The tip blade body 23 has a mountain-like shape and is formed continuously, with blade body recesses 23a formed in the valleys. The cutting blade recess 30a is formed to be shallower than the depth of the recess space 30, but deeper than the depth of the blade body recess 23a. In other words, the depth relationship of each recess (recess space 30, cutting blade recess 30a, and blade body recess 23a) is recess space 30 > cutting blade recess 30a > blade body recess 23a.

[0053] The cutting blades 22, which are provided for the rotary grass cutting blade M to actually cut weeds, are located on the cutting function edge 21 of the cutting blade 20 and on the recessed cutting function edge 31 of the recessed space 30.

[0054] The cutting edge portion 21 of the cutting blade 20 corresponds to the front edge and rear edge of each tip blade 23 in the direction of blade rotation when the grass cutting blade body 10 is viewed from the front (plan view). The front edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a back blade 22a, on the back surface of the grass cutting blade body 10. The rear edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a front blade 22b, on the surface of the grass cutting blade body 10.

[0055] Furthermore, the leading edge and trailing edge of the cutting blade 20 in the direction of blade rotation are long cutting blades 22 that extend to the bottom of the recessed space 30. Also, of the six chip blade bodies 23, the trailing edge of the third chip blade body 23 in the direction of blade rotation and the leading edge of the fourth chip blade body 23 in the direction of blade rotation are long cutting blades 22 that extend to the bottom of the cutting blade recess 30a. In other words, in a plan view of the rotary grass cutting blade M, the left and right edges of the recessed space 30 and the cutting blade recess 30a are cutting blades 22 that extend to the bottom of each recess.

[0056] Furthermore, the tips of the six chipped blade bodies 23 of the cutting blade 20 are provided with chips 23b, which are shaped to enhance the cutting performance of the cutting blade 22, thus giving it the shape of a chip saw blade.

[0057] The bottom of the recessed space 30 and the bottom of the cutting blade recess 30a form a recessed cutting function edge 31, and cutting blades 22 are formed on both the front and back sides of the grass cutting blade body 10. In other words, the recessed space 30 and the cutting blade recess 30a are configured so that weeds taken into the recessed spaces during mowing can be cut by the cutting blades 22 (back blade 22a or front blade 22b) formed on the cutting function edge 21 of the cutting blade 20 and the cutting blades 22 formed on the bottom (recessed cutting function edge 31).

[0058] Furthermore, the rotary grass cutting blade M according to the second embodiment has a back blade 22a and a front blade 22b formed on the cutting edge 21, so that the grass cutting blade body 10 can be attached to the brush cutter 40 on both sides and still perform the weed cutting function. Therefore, for example, if the grass cutting blade body 10 is being used with the front side facing outwards and the sharpness of the back blade 22a that cuts weeds decreases, the grass cutting blade body 10 can be reversed, and the cutting work can be continued with good sharpness using the front blade 22b.

[0059] [Third Embodiment] As shown in Figure 7, the rotary grass cutting blade M according to the third embodiment has six cutting blades 20, each having four mountain-shaped chip blades 23 formed on the peripheral edge 11 of the grass cutting blade body 10. Furthermore, each of the six cutting blades 20 is provided at equal intervals on the peripheral edge 11 of the grass cutting blade body 10, with recessed spaces 30 between the cutting blades 20.

[0060] The chip body 23 has a mountain-like shape and is formed continuously to create a recessed area 23a in the blade body, which is the valley. The recessed space 30 is formed to be deeper than the depth of the recessed area 23a. In other words, the depth relationship between the recessed space 30 and the recessed area 23a is recessed space 30 > recessed area 23a.

[0061] The cutting blades 22, which are provided for the rotary grass cutting blade M to actually cut weeds, are located on the cutting function edge 21 of the cutting blade 20 and on the recessed cutting function edge 31 of the recessed space 30.

[0062] The cutting edge portion 21 of the cutting blade 20 corresponds to the front edge and rear edge of each tip blade 23 in the direction of blade rotation when the grass cutting blade body 10 is viewed from the front (plan view). The front edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a back blade 22a, on the back surface of the grass cutting blade body 10. The rear edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a front blade 22b, on the surface of the grass cutting blade body 10.

[0063] Furthermore, the leading edge and trailing edge of the cutting blade 20 in the direction of blade rotation are long cutting blades 22 that extend to the bottom of the recessed space 30. In other words, in a plan view of the rotary grass cutting blade M, the left and right edges of the recessed space 30 are cutting blades 22 that extend to the bottom of the recess.

[0064] Furthermore, the tips of the four carbide-tipped blade bodies 23 of the cutting blade 20 are equipped with tips 23b, which enhances the cutting performance of the cutting blade 22. This configuration is similar to that of a carbide-tipped saw blade.

[0065] The bottom of the recessed space 30 is formed as a recessed cutting edge 31, and cutting blades 22 are formed thereon that can cut on both the front and back sides of the grass cutting blade body 10. In other words, the recessed space 30 allows weeds that are caught in the recessed space during mowing to be cut by the cutting blades 22 (back blade 22a or front blade 22b) formed on the cutting edge 21 of the cutting blade 20 and the cutting blades 22 formed on the bottom (recessed cutting edge 31).

[0066] Furthermore, the rotary grass cutting blade M according to the third embodiment has a back blade 22a and a front blade 22b formed on the cutting edge 21, so that the grass cutting blade body 10 can be reversed and perform the cutting function on both sides. Therefore, for example, when the grass cutting blade body 10 is used with the front side facing outwards, if the cutting performance of the back blade 22a that cuts weeds deteriorates, the grass cutting blade body 10 can be reversed and the cutting work can be performed with the front blade 22b.

[0067] [Fourth embodiment] The rotary grass cutting blade M according to the fourth embodiment, as shown in Figure 8, has eight cutting blades 20, each having three mountain-shaped chip blades 23 formed on the peripheral edge 11 of the grass cutting blade body 10. Furthermore, each of the eight cutting blades 20 is evenly spaced on the peripheral edge 11 of the grass cutting blade body 10. of The cutting blades are held in place, and the space between them is a recessed space 30.

[0068] The chip body 23 is formed in a continuous V-shape, creating a recessed area 23a that forms a valley. The recessed space 30 is formed to be deeper than the recessed area 23a. In other words, the depth relationship between the recessed space 30 and the recessed area 23a is recessed space 30 > recessed area 23a.

[0069] The cutting blade 22 of the rotary grass cutting blade M is provided on the cutting function edge 21 of the cutting blade 20 and on the recessed cutting function edge 31 of the recessed space 30.

[0070] The cutting edge portion 21 of the cutting blade 20 corresponds to the front edge and rear edge of each individual tip blade 23 in the direction of blade rotation when the grass cutting blade body 10 is viewed from the front (plan view). The front edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a back blade 22a, on the back surface of the grass cutting blade body 10. The rear edge of the tip blade 23 in the direction of blade rotation forms an inclined cutting blade 22, i.e., a front blade 22b, on the surface of the grass cutting blade body 10.

[0071] Furthermore, the leading edge and trailing edge of the cutting blade 20 in the direction of blade rotation are long cutting blades 22 that extend to the bottom of the recessed space 30. In other words, in a plan view of the rotary grass cutting blade M, the left and right edges of the recessed space 30 are cutting blades 22 that extend to the bottom of the recess.

[0072] Furthermore, the tips of the three carbide-tipped blade bodies 23 of the cutting blade 20 are equipped with tips 23b, which enhances the cutting performance of the cutting blade 22. This configuration is similar to that of a carbide-tipped saw blade.

[0073] The bottom of the recessed space 30 serves as the recessed cutting edge 31, and cutting blades 22 are provided on both the front and back sides of the mowing blade body 10, allowing for cutting. In other words, the recessed space 30 allows weeds caught in the recessed space during mowing to be cut by the cutting blades 22 (back blade 22a or front blade 22b) formed on the cutting edge 21 of the mowing blade 20 and the cutting blades 22 formed on the bottom (recessed cutting edge 31).

[0074] Furthermore, in the fourth embodiment, the rotary grass cutting blade M has a back blade 22a and a front blade 22b formed on the cutting edge 21, so that the grass cutting blade body 10 can be reversed and attached to the front side on either side to perform the weed cutting function. Therefore, for example, when the grass cutting blade body 10 is used with the front side facing outwards and the sharpness of the back blade 22a decreases, the grass cutting blade body 10 can be reversed and the cutting work can be continued with the front blade 22b.

[0075] As shown in the first to fourth embodiments described above, the rotary grass cutting blade M according to the present invention can be used with a reversed cutting blade 22, which has a back blade 22a that functions when the grass cutting blade body 10 is used with the front facing outwards, and a front blade 22b that functions when the grass cutting blade body 10 is used with the back facing outwards. This allows the grass cutting blade body 10 to be reversed during long-term grass cutting work to maintain its sharpness to the maximum extent.

[0076] Furthermore, by providing a recessed space 30 and a cutting blade recess 30a, weeds are cut while being drawn into the spaces formed by each recess.

[0077] Furthermore, the embodiments shown in the first to fourth embodiments differ in the number of chipped blades 23, the number of cutting blades 20, and the presence or absence of cutting blade recesses 30a. Naturally, the more chipped blades 23 and cutting blades 20 there are, the better the overall cutting performance of the rotary grass cutting blade M.

[0078] Therefore, in all embodiments, a high level of weed cutting capability can be obtained through the interaction between the recessed space 30, the cutting function edge 21, and the recessed cutting function edge 31. Furthermore, although the third and fourth embodiments do not have a cutting blade recess 30a, there is no difference between the recessed space 30 and the cutting blade recess 30a, and the same effect as those with a cutting blade recess 30a can be obtained. In addition, even without forming a cutting blade recess 30a, the overall cutting performance is improved by increasing the number of cutting blades 20.

[0079] [Other examples] Another possible embodiment involves partially inclining the numerous cutting blades 20 that protrude from the peripheral edge 11 of the grass cutting blade body 10. That is, as shown in Figures 9 and 10, the cutting blades 20 are formed by alternating horizontal cutting blades 20a and downwardly inclined downward cutting blades 20b.

[0080] The cutting blade 20 consists of two types of cutting blades 20: a horizontal cutting blade 20a and a downward cutting blade 20b. For example, when cutting tall weeds, the blade can cut the stem near the base of the weed and the middle of the stem that is caught in the recessed space 30 and the cutting blade recess 30a. department It cuts. Therefore, it can cut weeds more finely compared to conventional flat-shaped weed cutting blades.

[0081] Furthermore, the lower cutting blade 20b can further shred weeds below the cutting blade body 10 by pressing down from above so that the rotary cutting blade M covers the weeds during the cutting operation. In addition, the recessed space 30 and the cutting blade recess 30a can capture and cut weeds that have sprung out upwards and cannot be held down from above.

[0082] Furthermore, the cutting blade 20 has a back blade 22a and a front blade 22b formed on the cutting edge 21, so that it can perform the cutting function by being reversed. Therefore, the rotary grass cutting blade M according to other embodiments can also be used by reversing it.

[0083] The lower cutting blade 20b is tilted upward when the grass cutting blade body 10 is inverted. The upward-tilted lower cutting blade 20b, in the same way as the lower cutting blade 20b described above, cuts weeds together with the horizontal cutting blade 20a. multiple It cuts in sections. Therefore, it can cut weeds more finely compared to conventional flat-shaped weed cutting blades.

[0084] In particular, by forming the lower cutting blade 20b, the recessed space 30 and the cutting blade recess 30a are formed in the vertical direction with varying heights. As a result, weeds are captured three-dimensionally by the recessed space 30 and the cutting blade recess 30a, which increases the efficiency of weed shredding.

[0085] Furthermore, when cutting tall weeds with a conventional horizontally oriented cutting blade, the long cut weeds may try to get tangled around the output shaft 41 of the brush cutter 4. However, the upwardly sloping downward cutting blade 20b can cut weeds that are heading towards the output shaft 41 after cutting, preventing them from getting tangled around the output shaft 41.

[0086] In other embodiments, the rotary grass cutting blade M, unlike conventional flat grass cutting blades, forms a three-dimensional shape by creating a lower cutting blade 20b regardless of whether the grass cutting blade body 10 is used with its front or back side. This creates a three-dimensional airflow when rotated. This three-dimensional airflow, combined with the up-and-down and left-and-right movements of the brush cutter 4 which suppresses weeds from above, allows the cut weeds to be scattered sparsely, making it easier to process the weeds after the cutting work.

[0087] Therefore, the rotary grass cutting blade M according to other embodiments can be used by reversing it to maximize the sharpness of the cutting blade 22, as well as to take advantage of the unique effects that appear when the grass cutting blade body 10 is facing outwards and when it is facing inwards, as desired.

[0088] Furthermore, as shown in Figures 11 and 12, in other embodiments, the cutting blade 20 can be formed with an upwardly inclined upper cutting blade 20c in addition to the horizontal cutting blade 20a and the downward cutting blade 20b. By forming both the downward cutting blade 20b and the upper cutting blade 20c, the unique effects of the front and back surfaces that would occur if only the downward cutting blade 20b were formed can be achieved in combination.

[0089] Specifically, the lower cutting blade 20b and the upper cutting blade 20c, together with the horizontal cutting blade 20a, cut weeds in the upper, middle, and lower sections. Three types of cutting blades It can be used to cut, and is effective in cutting tall weeds into smaller pieces.

[0090] Furthermore, the lower cutting blade 20b can further shred weeds below the cutting blade body 10 by pressing down from above so that the rotary cutting blade M covers the weeds during the cutting operation, using the lower cutting blade 20b and the recessed space 30. In addition, the upper cutting blade 20c can prevent weeds from getting tangled around the output shaft 41 of the brush cutter 4. Also, similar to the case where the lower cutting blade 20b is formed, it can shred three-dimensionally during rotation. target It generates a gentle airflow, which helps to scatter the cut weeds sparsely, making it easier to dispose of them after use.

[0091] Furthermore, the rotary grass cutting blade M of this embodiment has three types of cutting blades 20: a horizontal cutting blade 20a, a downward cutting blade 20b, and an upward cutting blade 20c. Because it has a symmetrical shape, even when the grass cutting blade body 10 is used upside down, the same effect as the front surface is obtained, and the sharpness of the cutting blade 22 can be maintained to the maximum extent. [Explanation of symbols]

[0092] M Rotary Grass Trimmer Blade 10 Grass cutting blade body 11 Peripheral area 12 mounting holes 20 cutting blade 20a horizontal cutting blade 20b Lower cutting blade 20c upper cutting blade 21 Cutting function edge 22 Cutting blade 22a Back blade 22b Front blade 23 Tip blade 23a Blade body recess 23b chip 30 Recessed space 30a Cutting blade recess 31 Recessed cutting function edge 40 Brush cutter 41 Output shaft 42 Output shaft cover 43 Mounting bolts 44 brackets

Claims

[Claim 1] In a disc-shaped grass cutting blade body that has multiple roughly uneven cutting blades on its periphery and cuts weeds by rotation, The plurality of adjacent cutting blades formed on the periphery of the disc-shaped cutting blade body, The recessed space formed between the plurality of cutting blades, A recessed cutting function edge is provided at the bottom edge of the recessed space, The plurality of cutting blades are provided with cutting function edges at the leading edge and trailing edge in the rotational direction, The recessed cutting edge and the cutting edge are, The aforementioned grass cutting blade body is configured to have a back blade and a front blade that can be used by reversing the blade, and the cutting blade is made to have both a front and back blade. The cutting blade is characterized by having a plurality of substantially V-shaped chip blade bodies formed in a series, with both sides having the cutting function edges, and having a cutting blade recess formed in the substantially central part of the cutting blade, which is deeper than the blade body recess, which is the valley of the continuously formed chip blade body, but shallower than the recess space.

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