Grass cutting blades and grass cutters

Abstract

To provide a grass cutting blade and a grass cutter capable of preventing soil from entering into a main body. [Solution] The grass cutter 1 includes a main body 20 in which a drive means is housed inside a cover body 21, and a grass cutting blade 10 that is attached to the main body 20 and vibrates by the drive means. The grass cutting blade 10 includes a blade portion 11 that is flat and has sawtooth blades 11A formed on both sides, and a connecting portion 12 that connects the blade portion 11 to the main body 20. The connecting portion 12 includes a round bar-shaped portion 12A, a blade connecting portion 12B that connects the blade portion 11 to one end of the round bar-shaped portion 12A, and a main body mounting portion 12C that attaches the round bar-shaped portion 12A to the main body 20. The connecting portion 12 and the blade portion 11 are connected such that the round bar-shaped portion 12A has an angle θ of 20° to 40° with respect to the blade portion 11.

Description

[Technical field]

[0001] The present invention relates to a grass cutting blade and a grass cutting machine. [Background technology]

[0002] If you make a living growing vegetables, you will have a problem with weeds that grow just as fast as your crops. If you leave the crops alone, they will become hidden among the weeds and become invisible, and they will become thin and die. You could try using herbicides, but they often cannot be used due to compatibility with the crops and soil. This is a common problem not only for farmers, but for anyone who owns land. If there are no crops, it is possible to use herbicides to get rid of the weeds, but in yards and under plants, the only way to remove them is by hand, and even if you do, they will tear off or small weeds will be missed, and the grass will soon grow back and turn green.

[0003] For this reason, metal grass scrapers have been used since ancient times. However, grass scrapers are not universal, depending on the type of grass, the softness of the soil, the size of the crop, etc., and each has its pros and cons. If the conditions are right, they can be effective, but if the timing is off, they are useless. For example, the soil type of a field that is easy to grow crops is usually called loam, and is a mixture of 62.5% sand and 37.5% clay. If crops are planted in this type of soil, and it rains when the grass begins to grow, the soil becomes soft, and if you enter the field to remove the grass, your footprints will be large and deep in the soil, making it impossible to enter the field. If the rainfall in a day is 10 mm, you will not be able to enter the field the next day, if it is 20 mm, you will not be able to enter the field for two days, and if it is 30 mm, you will not be able to enter the field for three days. Even if you enter the field and remove the grass, mud will stick to the grass roots, and the grass scraper will also get soil on it, 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 grass scraper to remove weeds all at once within 2 to 3 days of this, you can effectively remove weeds that are about 15 cm tall.

[0004] However, on the fourth day, the grass becomes too hard to remove, and the soil hardens, making it difficult to remove with a large grass scraper. Instead, a small one-handed grass scraper is used, with the blade piercing the grass at its roots and scraping it out. After six days, the soil no longer resists the blade of the grass scraper, and the best way to remove it is to use both hands to forcefully scrape the sickle blade, but the resistance of the soil damages the sickle blade, and it becomes unusable as a sickle. The soil is so compacted that it becomes so hard that even a chisel can be used to dig it up. After this, the tip of the saw sickle blade is pierced into each stalk of grass to cut off the roots and remove the weeds, or the next rain is waited for, but the grass grows more and more vigorously and becomes uncontrollable.

[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 grass scraper could not penetrate, and the blade would cut through the soil as well. An electric saw uses electricity to rotate a motor, and the rotary motion is converted into vibration by a cam or other device. Although the vibration of the blade itself is small, the vibration is high, at over 2,000 times per minute, and the blade can penetrate even hard soil. Therefore, we considered how to cut grass roots using vibration.

[0006] Weed seeds germinate when they are present at a depth of about 0.5 cm to 1 cm below the soil surface, while seeds at a depth shallower than this do not germinate and go dormant due to drying of the soil, etc., and seeds at a depth deeper than this go dormant because they cannot germinate due to soil pressure, etc. This 0.5 cm to 1 cm deep in the soil is the base of growth for weeds, and here is the branching point that becomes the trunk and root, which is called the pole (see Non-Patent Document 1). If the roots of grass are cut and pulled out below this pole, about 0.5 cm to 1 cm below the surface, even if the roots remain in the ground, they will not germinate and grow. Conversely, if the grass is cut above this pole, the part that will become the trunk of the pole remains in the ground and will grow immediately. In other words, it is preferable to insert the blade into the ground 1 cm to 2 cm below the surface to cut the roots of the grass.

[0007] Patent Document 1 describes a grass cutter that includes a blade section whose cutting edge is formed so that it can be pushed into the soil, and a main body section that has a drive means for swinging the blade section back and forth. However, when the cutting edge is inserted into the soil, 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, which may cause a 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 light of the above problems, and has an object to provide a grass cutting blade and a grass cutter 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 driving means to a main body stored inside a cover body, and is vibrated by the driving means.The grass cutting blade 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 portion.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 portion, 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 grass mower of the present invention comprises a main body having a drive means housed inside a cover body, and the grass mowing blade of the present invention. Effect 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 thus to prevent malfunctions.

[0014] In addition, the connecting part and the blade part are joined so that the round bar part forms an angle of 20° to 40° with respect to the blade part, so that the operator can hold the main body part 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 position 1cm to 2cm below the ground surface, making it easy to mow grass effectively.

[0015] Furthermore, by removing clams from the saw blade, it is possible to prevent tree roots and the like from getting caught, making it easier to mow grass. [Brief description 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. [Diagram 2] 2 is an exploded view showing the configuration of a grass cutting blade used in the grass cutter shown in FIG. 1. [Diagram 3] 1. FIG. 4 is another exploded view showing the configuration of the grass cutting blade used in the grass cutter shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

[0019] The driving means has, for example, a motor as a power source and a conversion mechanism that converts the rotational driving force of the motor into a reciprocating driving force in the front-rear direction. For example, a blade attachment part 22 for attaching the grass cutting blade 10 is provided protruding from the front side of the cover body 21. At the tip of the blade attachment part 22, for example, an insertion part for inserting the body attachment part 12C of the grass cutting blade 10 described later is provided, and the grass cutting blade 10 can be attached by inserting the rear end of the body attachment part 12C and fixing it with a screw 23. The blade attachment part 22 is connected to the driving means and is configured to transmit the driving force of the driving means to the grass cutting blade 10. For example, an electric cord 24 for supplying power to the driving means is taken out from the rear side of the cover body 21. For example, a grip part 25 for the operator to hold is provided on the upper side of the cover body 21.

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

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

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

[0023] The connecting part 12 has a round bar-shaped part 12A made of a round bar-shaped member, a blade joining part 12B provided at one end of the round bar-shaped part 12A and joining the blade part 11 to the round bar-shaped part 12A, and a body attachment part 12C provided at the other end of the round bar-shaped part 12A and attaching the round bar-shaped part 12A to the body part 20. The reason why the blade part 11 and the body part 20 are connected by the round bar-shaped part 12A is that when the blade part 11 is inserted into the soil and vibrated, soil, roots, dirt, etc. are unlikely to adhere to the round bar-shaped part 12A, and even if they do adhere, they can be easily shaken off. The diameter of the round bar-shaped part 12A is preferably about 0.5 cm to 1 cm, for example. This is because it is possible to effectively suppress the adhesion of soil, etc. while maintaining strength.

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

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

[0026] The grass cutter 1 is used, for example, as follows. First, the operator attaches the grass cutting blade 10 to the main body 20 and drives the main body 20 to vibrate the grass cutting blade 10 in the front-rear direction, 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 maintaining the blade 11 horizontally at a position 1 cm to 2 cm above the ground surface, the operator moves the main body 20 sideways, forwards and backwards, or diagonally to cut the roots of the weeds. The operator can easily perform grass cutting work 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, since the connecting portion 12 that connects the blade portion 11 to the main body portion 20 has the round bar portion 12A, when the blade portion 11 is inserted into the ground and vibrated, soil, roots, dirt, etc. are unlikely 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 the occurrence of malfunctions.

[0028] In addition, since the connecting part 12 and the blade part 11 are joined so that the round bar part 12A has an angle θ of 20° to 40° with respect to the blade part 11, the operator can hold the main body part 20 in his / her hand and easily move the blade part 11 horizontally to the ground. Therefore, the blade part 11 can be easily moved at a depth of 1 cm to 2 cm below the ground surface, allowing 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 cut grass.

[0030] Although the present invention has been described above by way of an embodiment, the present invention is not limited to the above embodiment and examples, and various modifications are possible. 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. In addition, 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 attachment portion, 12D...screw hole, 12E...screw, 12F...projection portion, 20...main body portion, 21...cover body, 22...blade attachment 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 is 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 attachment portion that attaches the other end of the round bar portion to the body portion, The connecting portion and the blade portion are joined 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 said serrated blade is clam-free.

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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