Mowing blade and mower

Abstract

To provide a mowing blade and a mower which can suppress entry of mud and the like into a body part.SOLUTION: A mower 1 includes: a body part 20 in which drive means is housed inside a cover body 21; and a mowing blade 10 which is attached to the body part 20 and vibrated by the drive means. The mowing blade 10 includes: a plate-shaped blade part 11 with serrated blades 11A formed on both sides; and a connection part 12 connecting the blade part 11 to the body part 20. The connection part 12 includes: a round rod part 12A; a blade bonding part 12B bonding the blade part 11 to one end part of the round rod part 12A; and a body attachment part 12C attaching the round rod part 12A to the body part 20. The connection part 12 and the blade part 11 are bonded such that the round rod part 12A has an angle θ of 20°- 40°with respect to the blade part 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mowing blade and a mower. [Background technology]

[0002] If you make a living growing vegetables, you'll have a problem with weeds that grow just as fast as your crops. If you leave them, the crops will become hidden among the weeds and become invisible, causing them to wither and die. While using herbicides is an option, they often cannot be used due to compatibility with the crops and soil. This is a common problem not only for farmers but also for anyone who owns land. If there are no crops, it is possible to eradicate them with herbicides, but in gardens and under plants, the only option is to remove them by hand, and even if you do so, they will tear off or small weeds will be missed, and the grass will soon grow back green.

[0003] For this reason, metal weed scrapers have been used since ancient times. However, weed scrapers are not universally effective, depending on the type of grass, the softness of the soil, the size of the crop, and other factors. Each has its pros and cons. While they can be effective when the conditions are right, they are useless if used at the wrong time. For example, the soil texture of fields that are ideal for growing crops is typically loam, a mixture of 62.5% sand and 37.5% clay. If crops are planted in this type of soil and rain falls just as the grass begins to sprout, the soil softens. Entering the field to remove weeds leaves large, deep footprints, making it impossible to enter. If rainfall is 10 mm in a day, the field cannot be entered the next day; if it is 20 mm, it cannot be entered for two days; and if it is 30 mm, it cannot be entered for three days. Even if one does manage to remove the weeds, mud will cling to the grass roots, and the weed scraper will also get soiled, making it difficult to cut the roots. The best time to start weeding is after the aforementioned number of days have passed since rainfall. If you use a large weed scraper to remove weeds all at once within two to three days of this, you can efficiently remove weeds that are about 15 cm tall.

[0004] However, by the fourth day, the weeds were blocked by the grass and the soil had hardened, making it difficult to remove with a large weed remover. Instead, a small, one-handed weed remover was used, stabbing the blade into the roots of the grass and scraping it out. After six days, the soil no longer resisted the weed remover's blade, and the best method was to use both hands to scrape it out with force, but the resistance of the soil damaged the sickle blade, rendering it unusable as a sickle. The soil had become so compacted that it was hard enough to dig through with a chisel. After this, the only way to remove the weeds was to stab the tip of a saw sickle into each stalk of grass and cut off the roots, or to wait for the next rain, but the grass would continue to grow more and more vigorously.

[0005] In such cases, when cutting the roots of garden trees with an electric saw, the blade would penetrate the soil, which had become so hard that even a weed scraper would not penetrate, and the blade would cut right through the soil. An electric saw uses electricity to rotate a motor, and the rotational motion is converted into vibration using a cam or other device. Although the vibration of the blade itself is small, it is still strong, at over 2,000 times per minute, and is able to penetrate even hard soil. Therefore, we considered how we could use vibration to cut grass roots.

[0006] Weed seeds germinate when they are present approximately 0.5 cm to 1 cm below the soil surface. Seeds shallower than this do not germinate and remain dormant due to factors such as soil drying. Seeds deeper than this become dormant and unable to germinate due to factors such as soil pressure. This 0.5 cm to 1 cm depth in the soil is the weed's growth base, where the branching point that becomes the trunk and roots is located, called the pole (see Non-Patent Document 1). If the roots of grass are cut and pulled below this pole, approximately 0.5 cm to 1 cm below the surface, even if the roots remain underground, they will not germinate and grow. Conversely, if grass is cut above this pole, the trunk-forming part of the pole remains underground and will quickly grow. In other words, it is preferable to insert the blade 1 cm to 2 cm below the surface to cut the grass roots.

[0007] Patent Document 1 describes a mower equipped with a blade section whose cutting edge is formed so that it can be pushed into the ground, and a main body section having a drive means for swinging the blade section back and forth. However, when the cutting edge is inserted into the ground, soil, grass roots, debris, etc. may adhere to the blade section and the attachment section between the blade section and the drive section, and may enter the main body section, causing a risk of malfunction. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 11-168934 [Non-patent literature]

[0009] [Non-Patent Document 1] Science of Crop Science by Shinichiro Kawada, University of Tokyo Press Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in response to such problems, and has an object to provide a grass cutting blade and a grass cutting machine that can prevent soil and the like from getting into the main body. [Means for solving the problem]

[0011] The grass cutting blade of the present invention is used by attaching a drive means to a main body stored inside a cover body, and is vibrated by the drive means.It has a flat blade portion with saw-like blades formed on both sides, and a connecting portion that connects the blade portion to the main body.The connecting portion has a round bar-shaped portion, a blade connecting portion that joins the blade portion to one end of the round bar-shaped portion, and a main body mounting portion that attaches the other end of the round bar-shaped portion to the main body, and the connecting portion and the blade portion are joined so that the round bar-shaped portion forms an angle of 20° to 40° with respect to the blade portion.

[0012] The mower of the present invention comprises a main body in which a drive means is housed inside a cover body, and the mowing blade of the present invention. [Effects of the Invention]

[0013] According to the present invention, the connecting part that connects the blade part to the main body has a round bar-shaped part, so when the blade part is inserted into the soil and vibrated, soil, roots, debris, etc. are less likely to adhere to the round bar-shaped part, and even if they do adhere, they can be easily shaken off. This makes it possible to prevent soil, etc. from getting into the main body and reduce the occurrence of malfunctions.

[0014] Furthermore, because the connecting part and the blade part are joined so that the round bar part is at an angle of 20 to 40 degrees to the blade part, the operator can hold the main body in his / her hand and move the blade part horizontally to the ground easily. This allows the blade part to be easily moved to a depth of 1 to 2 cm below the ground surface, allowing for easy and effective weeding.

[0015] Furthermore, if the saw blade is free of clams, it is possible to prevent tree roots and the like from getting caught, making it easier to mow grass. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram illustrating a configuration of a grass mower according to an embodiment of the present invention. [Figure 2] 2 is an exploded view showing the configuration of a mowing blade used in the mower shown in FIG. 1. FIG. [Figure 3] 1. FIG. 4 is another exploded view showing the configuration of the mowing blade used in the mower shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0018] Figure 1 shows the configuration of a mower 1 according to one embodiment of the present invention. Figures 2 and 3 are exploded views showing the configuration of a mower blade 10 used in the mower 1, with Figure 2 showing the configuration as seen from the side and Figure 3 showing the configuration as seen from above. This mower 1 comprises a main body 20 in which a drive means (not shown) is housed inside a cover body 21, and the mower blade 10 which is attached to the main body 20 and vibrates due to the drive means.

[0019] The drive means includes, for example, a motor serving as a power source and a conversion mechanism that converts the motor's rotational drive force into a reciprocating drive force in the front-rear direction. A blade attachment portion 22 for attaching the mowing blade 10, for example, protrudes from the front side of the cover body 21. The tip of the blade attachment portion 22 is provided with an insertion portion into which the main body attachment portion 12C of the mowing blade 10 (described below) is inserted. The mowing blade 10 can be attached by inserting the rear end of the main body attachment portion 12C and fastening it with a screw 23. The blade attachment portion 22 is connected to the drive means and transmits the drive force of the drive means to the mowing blade 10. An electrical cord 24 for supplying power to the drive means, for example, extends from the rear side of the cover body 21. A grip portion 25 for the operator to hold the cover body 21 is provided, for example, on the upper side of the cover body 21.

[0020] The main body 20 may be the main body of an existing electric saw, i.e., a main body in which a drive means for vibrating the saw blade is housed inside a cover. In this case, the saw blade of the electric saw can be replaced with the grass cutting blade 10 of this embodiment.

[0021] The grass cutting blade 10 has a flat blade portion 11 with saw-like blades 11A formed on both sides, and a connecting portion 12 that connects the blade portion 11 to the main body 20. The blade portion 11 and the connecting portion 12 are preferably made of a metal material such as iron or stainless steel, for example, because sufficient strength can be obtained. The blade portion 11 is preferably strip-shaped, for example, and the tip side is preferably triangular pointed so that it can be easily inserted into the soil. The size of the blade portion 11 is preferably, for example, approximately 15 cm to 20 cm in length, approximately 1 cm to 3 cm in width, and approximately 0.15 cm to 0.2 cm in thickness, for example, because this makes it easy to handle. The length of the pointed portion on the tip side of the blade portion 11 is preferably, for example, approximately 1 cm to 3 cm. A screw hole 11B for fixing the connecting portion 12 is provided at the rear end of the blade portion 11, for example.

[0022] The sawtooth blade 11A is provided, for example, on both long sides of the blade portion 11. The sawtooth blade 11A is intended to embrace and cut grass root hairs as thin as silk needles by vibration. The sawtooth blade 11A is preferably shaped like an isosceles triangle with a cutting depth of, for example, about 0.2 cm to 0.4 cm and spacing of about 0.2 cm to 0.4 cm. It is preferable that the sawtooth blade 11A is free of clams. In other words, it is preferable that no clams are formed and that the blade portion 11 is free of clams. This is because clams may catch on tree roots or the like, causing the vibration of the blade portion 11 to stop.

[0023] The connecting portion 12 includes a round bar-shaped portion 12A made of a round bar-shaped member, a blade joining portion 12B provided at one end of the round bar-shaped portion 12A and joining the blade portion 11 to the round bar-shaped portion 12A, and a body attaching portion 12C provided at the other end of the round bar-shaped portion 12A and attaching the round bar-shaped portion 12A to the main body portion 20. The reason for connecting the blade portion 11 to the main body portion 20 via the round bar-shaped portion 12A is that when the blade portion 11 is inserted into the ground and vibrated, soil, roots, debris, etc. are less likely to adhere to the round bar-shaped portion 12A, and even if they do adhere, they can be easily shaken off. The diameter of the round bar-shaped portion 12A is preferably, for example, approximately 0.5 cm to 1 cm. This is because adhesion of soil, etc. can be effectively suppressed while maintaining strength.

[0024] The connecting portion 12 and the blade portion 11 are preferably joined so that the round bar portion 12A has an angle θ of 20° to 40° with respect to the plane of the blade portion 11. The length of the round bar portion 12A is preferably, for example, about 2 cm to 4 cm. This configuration allows the blade portion 11 to be easily moved parallel to the ground surface at a depth of 1 cm to 2 cm below the ground surface. Furthermore, the main body portion 20 can be freely moved by an operator holding it without being placed on the ground surface.

[0025] The blade joint portion 12B is formed, for example, in a flat plate shape so as to abut against the blade portion 11, and has a screw hole 12D formed therein corresponding to the screw hole 11B of the blade portion 11. The blade joint portion 12B is formed, for example, so that the round bar-shaped portion 12A has an angle θ of 20° to 40° with respect to the plane of the blade joint portion 12B. The blade portion 11 and the blade joint portion 12B are fixed, for example, by aligning the positions of the screw holes 11B and 12D, abutting them, and screwing in a screw 12E. The main body attachment portion 12C is shaped so as to be attached to the blade attachment portion 22 of the main body 20, for example. For example, the main body attachment portion 12C is provided with a protrusion 12F that is inserted into the blade attachment portion 22, and is attached to the main body 20 by inserting the protrusion 12F into an insertion portion of the blade attachment portion 22 and fixing it with a screw 23.

[0026] This mower 1 is used, for example, as follows. First, the operator attaches the mowing blade 10 to the main body 20 and drives the main body 20 to vibrate the mowing blade 10 back and forth, i.e., to move it back and forth. Next, the operator inserts the blade 11 into the roots of the weeds so that the blade 11 is horizontally hidden in the soil at a position 1 cm to 2 cm above the ground surface. Next, while keeping the blade 11 horizontal at a position 1 cm to 2 cm above the ground surface, the operator moves the main body 20 sideways, back and forth, or diagonally to cut the roots of the weeds. The operator can easily mow the weeds by holding and operating the main body 20 in one hand while raking up the cut weeds with the other hand.

[0027] According to this embodiment, the connecting portion 12 that connects the blade portion 11 to the main body portion 20 has the round bar portion 12A, so when the blade portion 11 is inserted into the ground and vibrated, soil, roots, debris, etc. are less likely to adhere to the round bar portion 12A, and even if they do adhere, they can be easily shaken off. This makes it possible to prevent soil, etc. from getting into the main body portion 20, and thus to prevent malfunctions.

[0028] Furthermore, because connecting portion 12 and blade portion 11 are joined so that round bar portion 12A forms an angle θ of 20° to 40° with respect to blade portion 11, an operator can hold main body 20 in his / her hand and easily move blade portion 11 horizontally to the ground. Therefore, blade portion 11 can be easily moved to a depth of 1 cm to 2 cm below the ground surface, allowing for easy and effective mowing.

[0029] Furthermore, if the saw blade 11A is free of clams, it is possible to prevent tree roots and the like from getting caught, making it easier to mow grass.

[0030] Although the present invention has been described above using embodiments, the present invention is not limited to the above embodiments and examples and can be modified in various ways. For example, although each component has been specifically described, it is not necessary to include all of the components, and other components may be included. Furthermore, the specific content of each component may be different. [Explanation of symbols]

[0031] 1...grass cutter, 10...grass cutting blade, 11...blade portion, 11A...serrated blade, 11B...screw hole, 12...connection portion, 12A...round bar portion, 12B...blade joint portion, 12C...main body mounting portion, 12D...screw hole, 12E...screw, 12F...projection portion, 20...main body portion, 21...cover body, 22...blade mounting portion, 23...screw, 24...electrical cord, 25...handle portion

Claims

1. A grass cutting blade in which a driving means is attached to a main body housed inside a cover body and vibrated by the driving means, a blade portion having a flat shape and saw-like blades formed on both sides thereof, and a connecting portion for connecting the blade portion to the main body portion; the connecting portion includes a round bar portion, a blade joining portion that joins the blade portion to one end of the round bar portion, and a body attaching portion that attaches the other end of the round bar portion to the body portion, The connecting portion and the blade portion are joined together so that the round bar portion has an angle of 20° to 40° with respect to the blade portion. A grass cutting blade characterized by the above.

2. 2. The grass cutting blade of claim 1, wherein the serrated blade is free of clams.

3. a main body portion in which a driving means is housed inside a cover body; The grass cutting blade according to claim 1 or 2, A grass mower comprising:

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