JP2018023283A - Bush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush cutter whose cutter rotating at high speed is not chipped or broken by an obstacle such as a large stone or metal.SOLUTION: Pan type washers 3 and 4 are used and mounted on the upper and lower sides of a rotary cutter 1 through an elastic body 5 for impact absorption for mitigating impact applied to a mower pin 2. A metal edge-cutting and protecting guide is mounted, which has a ring-shaped inner diameter which is larger at least by 20 mm than an outer diameter of the rotary cutter.SELECTED DRAWING: Figure 2

Description

The present invention relates to an improvement in a machine for cutting out weeds and the like.

A brush cutter of a mowing machine rotates a disc-shaped rotary blade with a saw blade by power to cut grass and the like.
Conventional brush cutters have the following drawbacks.
(1) Long grass is difficult to cut, and long grass after cutting cannot keep working.
(2) Even in the case of short grasses, the roots remain, so they will grow soon after cutting.
(3) Blades that rotate at high speeds are easily chipped or damaged by obstacles such as large stones and metals.
(4) In many cases, important flowers, crops, trees, etc. are damaged or cut.
Working while preventing these problems greatly reduces the efficiency of the original mowing.

In order to solve the problems of the above items (1) and (2), a rod-shaped cutting pin 2 that protrudes above and below the conventional rotary blade 1 is attached. The state is shown in FIGS. Two or more mowing pins 2 are attached while balancing the rotary blade 1.
As for the mounting method, as a result of various tests, it is attached to the upper and lower sides of the rotary blade using dish-shaped washers 3 and 4 and the elastic body 5 for shock absorption that reduces the impact applied to the cutting pin 2. It is characterized by.
The cutting pin 2 protruding from the lower part of the rotary blade 1 was confirmed to be very effective in removing weeds and the like by confirming the action of reducing the trimmed grass and cutting the grass roots. Further, the cutting pin 2 protruding above the rotary blade 1 is effective for trimming long grass.

  The present invention further provides a brush cutter characterized by mounting a ring-shaped cutting protection guide 8 having an inner diameter that is at least 20 mm larger than the outer diameter of the rotary blade 1. The reason for attaching the ring shape is to protect the rotary blade 1 from obstacles such as large stones and metals, and to broaden the scope of protection so that important flowers, crops, trees, etc. are not cut away. It is. It is also extremely effective in preventing accidents caused by unexpected workers.

The present invention is characterized in that a bar-shaped cutting pin 2 that protrudes above and below a conventional rotary blade 1 is attached. The state is shown in FIGS. Two or more mowing pins 2 are attached while balancing the rotary blade 1.
As for the mounting method, if the cutting pin 2 is directly fixed to the rotary blade 1 as a result of various tests, it is damaged immediately due to the impact applied to the pin and cannot be put into practical use. It is characterized in that dish-shaped washers 3 and 4 are used above and below the rotary blade 1 and are attached via an elastic body 5 for absorbing shock that alleviates the impact applied to the cutting pin 1. The cutting pin 2 protruding below the rotary blade was confirmed to be very effective in removing weeds and the like by confirming the action of reducing the grass that was cut off and cutting the roots of the grass.
The cutting pin 2 protruding above the rotary blade 1 is effective for trimming long grass, and once the grass has been trimmed, it is gradually cut into small pieces of grass, and the work continues even when long grass grows. There are benefits to be continued. It is also particularly suitable for trimming weeds that are intertwined with vine-like vines.

  The present invention is characterized in that a ring-shaped cutting protection guide 8 having an inner diameter which is at least 20 mm larger than the outer diameter of the rotary blade 1 is attached. A metal ring is preferred. Larger than rotating blades to protect the rotating blades from obstacles such as large stones and metals, and to broaden the range of protection so as not to damage or mow important flowers, crops, trees, etc., and The brush cutter is characterized in that it is attached with a ring-shaped edge cutting protection guide 8 to improve the work efficiency of edge cutting and to greatly improve the work efficiency.

As described above, the brush cutter according to the present invention to which the rotary blade 1 attached with the cutting pin 2 protruding above and below the rotary blade and the ring-shaped cutting protection guide 8 is attached is uprooted such as weeds as compared with the conventional machine. It became possible to harvest. Therefore, weed management became easier. In the case of long grass, weeding work became easy. In addition, weeds can be easily cut even in the case of weeds that are intertwined with vines such as kuzu. Also, by attaching the ring-shaped cutting protection guide 8, the rotary blade 1 is protected from obstacles such as large stones and metals, and the life of the blade is considerably improved. Furthermore, it was confirmed that important flowers, crops and trees could be prevented from being damaged or cut down, the workability was greatly improved, the efficiency of weeding work was improved, and the weeding time was greatly shortened.
As described above, the effect of the present invention is extremely large.

Schematic diagram when the cutting pin 2 and the ring-shaped edge cutting protection guide 8 of the present invention are attached to the rotary blade 1 of the brush cutter The assembly drawing when the cutting pin 2 of the present invention is attached to the rotary blade 1 of the brush cutter and the drawing showing the parts 3 to 7 used for the assembly The figure which shows the assembly example of the ring-shaped edge cutting protection guide 8 used for this invention. The figure which shows the relationship between the rotary blade 1, the cutting pin 2, and the ring-shaped edge cutting protection guide 8 of a brush cutter. The figure which shows the example of the attachment metal fitting of the ring-shaped edge cutting protection guide 8

A commercially available engine-driven rotary blade and a brush cutter with an outer diameter of 255 mm are used, and the cutting pin 2 of the present invention shown in FIG. 2 is made of metal with an outer diameter of 6 mm and a length of 50 mm. Installed as shown. A pair of dish-shaped washers 3 and 4 are used above and below the rotary blade 1 and are further attached via an elastic body 5 so that the cutting pin 2 protrudes to the lower part of the rotary blade, about 30 mm in total and about 20 mm to the upper part. In consideration of balance, four were attached so as to have an interval of 90 degrees. The diameter of the center line for attaching the cutting pin 2 is about 180 mm.
Although it depends on the state of the grass to be cut, the outer diameter of the cutting pin 2 is preferably about 5 to 8 mm, and the length of the cutting pin 2 protruding below the rotary blade is preferably about 15 to 30 mm. The length protruding upward is preferably 25 to 50 mm. The material of the cutting pin 2 is preferably made of metal, and the surface thereof is preferably hard and rigid. The dish type washers 3 and 4 used when assembling the cutting pin 2 are for making the pin easy to move when an impact of an obstacle is applied to the cutting pin 2. Further, the elastic body used has a very large effect because it absorbs the impact applied to the cutting pin to prevent the pin from being damaged and the pin can be easily restored to its original position. The elastic body is preferably made of hard rubber or the like, but the material is not limited.

  By using the ring-shaped cutting protection guide 8, the range to protect the rotary blade from stones and metal obstacles is widened, and the rotary blade is protected and mowing is smooth without damaging important flowers, crops, and trees. Therefore, weeding work becomes easier, work efficiency increases, and work time can be greatly shortened. The size of the ring should basically be larger than the outer diameter of the rotary blade, but is preferably at least 20 mm or more and 80 mm larger than the outer diameter of the rotary blade 1. In this case, the thickness of the ring of the cutting protection guide 8 is preferably about 5 to 8 mm depending on the material. The material is preferably made of metal, but it can also be used with iron-cored plastic.

The mowing pin 2 and the mowing protection guide 8 described in the above [0001] and [0002] items are attached, and the conventional machine and the actual mowing are used by using the brush cutter assembled as shown in FIGS. Various comparative tests were performed. As a result, in the case of the machine according to the present invention, in the case of short weeds, the cut grass becomes finer than the conventional machine, and the cut trace does not leave the root of the grass, and the grass is completely rooted. It was in a state where it was cut.
Next, the test was conducted in a place where weeds with a length of about 30 cm were growing. As a result, with conventional machines, workability was poor and it was not possible to continue working. On the other hand, in the case of the brush cutter of the present invention, it was confirmed that even in the case of a long grass, it was possible to continue the mowing, and the weeds to be trimmed were shortened, and the workability was greatly improved. . In the case of weeds with longer plant heights and intertwined vines such as kudzu, the conventional machines could not continue to cut. However, in the case of the machine according to the present invention, it was possible to continue the mowing easily and continuously.
In the case of the present invention in which the ring-shaped cutting protection guide 8 is installed, the machine can be moved freely from side to side and back and forth in order to reliably protect the rotary blade from large obstacles such as stones and metal. In addition, there is no need to worry about damaging important flowers, crops, and trees.

The present invention relates to an improvement in a machine for cutting out weeds and the like.

A brush cutter of a mowing machine rotates a disc-shaped rotary blade with a saw blade by power to cut grass and the like.
Conventional brush cutters have the following drawbacks.
(1) Long grass is difficult to cut, and long grass after cutting cannot keep working.
(2) Even in the case of short grasses, the roots remain, so they will grow soon after cutting.
(3) Blades that rotate at high speeds are easily chipped or damaged by obstacles such as large stones and metals.
(4) In many cases, important flowers, crops, trees, etc. are damaged or cut.
Working while preventing these problems greatly reduces the efficiency of the original mowing.

In order to solve the problems of the above items (1) and (2), a rod-shaped cutting pin 2 that protrudes above and below the conventional rotary blade 1 is attached. The state is shown in FIG. 1, FIG. 2, and FIG . Two or more mowing pins 2 are attached while balancing the rotary blade 1. As for the attachment method, the mowing pin 2 is not directly fixed to the rotary blade 1 but is attached through the elastic body 5 for absorbing the shock to ease the impact applied to the mowing pin 2 and for facilitating the return of the mowing pin 2. Features. As the elastic body 5, hard rubber or a coil spring can be used. The cutting pin 2 protruding from the lower part of the rotary blade 1 was confirmed to be very effective in removing weeds and the like by confirming the action of reducing the trimmed grass and cutting the grass roots. Further, the cutting pin 2 protruding above the rotary blade 1 is effective for trimming long grass.

The present invention further relates to a brush cutter characterized in that a ring-shaped cutting protection guide 8 having an inner diameter at least 20 mm larger than the outer diameter of the rotary blade 1 is attached. The reason for attaching the ring shape is to protect the rotary blade 1 from obstacles such as large stones and metals, and to broaden the scope of protection so that important flowers, crops, trees, etc. are not cut away. It is. It is also extremely effective in preventing accidents caused by unexpected workers.

The present invention is characterized in that a bar-shaped cutting pin 2 that protrudes above and below a conventional rotary blade 1 is attached. The state is shown in FIG. 1, FIG. 2 and FIG . Two or more mowing pins 2 are attached while balancing the rotary blade 1. As for the mounting method, if the cutting pin 2 is directly fixed to the rotary blade 1 as a result of various tests, it is damaged immediately due to the impact applied to the pin and cannot be put into practical use. For installation method, cutting the pin 2 rather than directly fixed to the rotary blade 1, it is attached via the elastic member 5 for facilitating the return of the shock absorbing and cutting pins 2 to alleviate the impact applied to the cutting pins 2 It is characterized by. As the elastic body 5, hard rubber or a coil spring can be used.
FIG. 2 shows an example in which hard rubber is used as the elastic body. In this case, dish-shaped washers 3 and 4 are used above and below the rotary blade 1. FIG. 3 shows an example in which a coil spring is used as the elastic body. In this case, making it easier to mitigate the impact applied to more cutting pin 1 to the shape of the pin guide 9 of the coil spring, it has been confirmed that the return of the cutting pin 1 can more quickly. The cutting pin 2 protruding below the rotary blade was confirmed to be very effective in removing weeds and the like by reducing the trimmed grass and cutting the grass roots.
The cutting pin 2 protruding above the rotary blade 1 is effective for trimming long grass, and once the grass has been trimmed, it is gradually cut into small pieces of grass, and the work continues even when long grass grows. There are benefits to be continued. It is also particularly suitable for trimming weeds that are intertwined with vine-like vines.

The present invention is characterized in that a ring-shaped cutting protection guide 8 having an inner diameter which is at least 20 mm larger than the outer diameter of the rotary blade 1 is attached. A metal ring is preferred. Larger than rotating blades to protect the rotating blades from obstacles such as large stones and metals, and to broaden the range of protection so as not to damage or mow important flowers, crops, trees, etc., and The brush cutter is characterized in that it is attached with a ring-shaped edge cutting protection guide 8 to improve the work efficiency of edge cutting and to greatly improve the work efficiency.

As described above, the brush cutter according to the present invention to which the rotary blade 1 attached with the cutting pin 2 protruding above and below the rotary blade and the ring-shaped cutting protection guide 8 is attached is uprooted such as weeds as compared with the conventional machine. It became possible to harvest. Therefore, weed management became easier. In the case of long grass, weeding work became easy. In addition, weeds can be easily cut even in the case of weeds that are intertwined with vines such as kuzu. Also, by attaching the ring-shaped cutting protection guide 8, the rotary blade 1 is protected from obstacles such as large stones and metals, and the life of the blade is considerably improved. It was also confirmed that important flowers, crops and trees could be prevented from being damaged or cut down, the workability was greatly improved, the efficiency of weeding work was improved, and the weeding time was greatly shortened. .
As described above, the effect of the present invention is extremely large.

Schematic diagram when the cutting pin 2 and the ring-shaped edge cutting protection guide 8 of the present invention are attached to the rotary blade 1 of the brush cutter Shows a part 3-7 using Runisaishi attaching the cut pins 2 of the present invention to the rotary blade 1 of the bush cutter, the elastic member 5 to the assembly drawing and assembly in the case of a hard rubber When attaching the cutting pin 2 of the present invention to the rotary blade 1 of the brush cutter, an assembly diagram when the elastic body 5 is a coil spring and a diagram showing components 9 to 12 used for the assembly The figure which shows the assembly example of the ring-shaped edge cutting protection guide 8 used for this invention. The figure which shows the relationship between the rotary blade 1, the cutting pin 2, and the ring-shaped edge cutting protection guide 8 of a brush cutter. The figure which shows the example of the attachment metal fitting of the ring-shaped edge cutting protection guide 8

A commercially available engine-driven rotary blade and a brush cutter with an outer diameter of 255 mm are used, and the cutting pin 2 of the present invention shown in FIG. 2 is made of metal with an outer diameter of 6 mm and a length of 50 mm. Installed as shown. A pair of dish-shaped washers 3 and 4 are used above and below the rotary blade 1, and the elastic body 5 is attached as hard rubber . The cutting pin 2 protrudes to the lower part of the rotary blade, about 30 mm in total, and about 20 mm to the upper part. Then, considering the balance, four were attached so as to have an interval of 90 degrees. The diameter of the center line for attaching the cutting pin 2 is about 180 mm. Although it depends on the state of the grass to be cut, the outer diameter of the cutting pin 2 is preferably about 5 to 8 mm, and the length of the cutting pin 2 protruding below the rotary blade is preferably about 15 to 30 mm. The length protruding upward is preferably 25 to 50 mm. The material of the cutting pin 2 is preferably made of metal, and the surface thereof is preferably hard and rigid. The dish type washers 3 and 4 used when assembling the cutting pin 2 are for making the pin easy to move when an impact of an obstacle is applied to the cutting pin 2. Further, the elastic body used has a very large effect because it absorbs the impact applied to the cutting pin to prevent the pin from being damaged and the pin can be easily restored to its original position. The elastic body is preferably made of hard rubber or the like, but the material is not limited.

By using the ring-shaped cutting protection guide 8, the range to protect the rotary blade from stones and metal obstacles is widened, and the rotary blade is protected and mowing is smooth without damaging important flowers, crops, and trees. Therefore, weeding work becomes easier, work efficiency increases, and work time can be greatly shortened. The size of the ring should basically be larger than the outer diameter of the rotary blade, but is preferably at least 20 mm or more and 80 mm larger than the outer diameter of the rotary blade 1. In this case, the thickness of the ring of the cutting protection guide 8 is preferably about 5 to 8 mm depending on the material. The material is preferably made of metal, but it can also be used with iron-cored plastic.

The mowing pin 2 and the cutting mowing protection guide 8 described in the above [0009] and [0010] sections are attached, and a conventional brush cutter and a conventional mowing cutter are assembled using a brush cutter assembled as shown in FIGS. Various comparative tests were performed. As a result, in the case of the machine according to the present invention, in the case of short weeds, the cut grass becomes finer than the conventional machine, and the cut trace does not leave the root of the grass, and the grass is completely rooted. It was in a state where it was cut. Next, the test was conducted in a place where long weeds having a plant height of about 50 cm were grown. As a result, with conventional machines, workability was poor and it was not possible to continue working. On the other hand, in the case of the brush cutter according to the present invention, even in the case of a long grass, it was possible to continue the mowing , and the weeds to be trimmed were shortened, and it was confirmed that the workability was greatly improved. . In the case of weeds with longer plant heights and intertwined vines such as kudzu, the conventional machines could not continue to cut. However, in the case of the machine according to the present invention, it was possible to continue the mowing easily and continuously.
In the case of the present invention in which the ring-shaped cutting protection guide 8 is installed, the machine can be moved freely from side to side and back and forth in order to reliably protect the rotary blade from large obstacles such as stones and metal. In addition, there is no need to worry about damaging important flowers, crops, and trees.

A commercially available engine-driven rotary blade and a brush cutter with an outer diameter of 255 mm are used, and the cutting pin 2 of the present invention is made of metal with an outer diameter of 6 mm and a length of 70 mm, and is attached as shown in FIGS. It was. The cutting pin 2 is attached to the rotary blade 1 using a coil spring as the elastic body 5, and the cutting pin 2 protrudes to the lower part of the rotary blade about 30mm in total and about 40mm to the upper part, considering the balance, and the interval of 90 degrees Four were attached so as to have. The diameter of the center line for attaching the cutting pin 2 is about 180 mm. The material of the cutting pin 2 was made of metal, the surface thereof was hard, and the rigidity was strong. Further, the pin guide 9 of the coil spring used when assembling the cutting pin 2 becomes easier to move when the cross section of its inner diameter is X-shaped in order to make the pin easier to move when an impact of an obstacle is applied to the cutting pin 2. It was confirmed that the lifetime of The cross section of the inner diameter of the pin guide 9 may be V-shaped or straight, but it is desirable that the cross section be X-shaped as shown in FIG.

By using the ring-shaped cutting protection guide 8, the range to protect the rotary blade from stones and metal obstacles is widened, and the rotary blade is protected and mowing is smooth without damaging important flowers, crops, and trees. Therefore, weeding work becomes easier, work efficiency increases, and work time can be greatly shortened. The size of the ring was 30 mm larger than the outer diameter of the rotary blade. At that time, the thickness of the ring of the cutting protection guide 8 was 8 mm. The material was made of metal.

The mowing pin 2 and the above described [0012] and [0013]
Using the brush cutter assembled with the cutting protection guide 8 and assembled as shown in FIGS. 1 and 3, various comparative tests between the conventional machine and the actual mowing were performed. As a result, according to the present invention In the case of the machine, in the case of short weeds, the cut grass became finer than in the conventional machine, and the cut traces were not rooted, and the grass was completely pruned. .
Next, a test was conducted in a place where long weeds with a plant height of about 50 cm were grown. As a result, with conventional machines, workability was poor and it was not possible to continue working. On the other hand, in the case of the brush cutter of the present invention, it was confirmed that even in the case of a long grass, it was possible to continue the mowing, and the weeds to be trimmed were shortened, and the workability was greatly improved. . In the case of weeds with longer plant heights and intertwined vines such as kudzu, the conventional machines could not continue to cut. However, in the case of the machine according to the present invention, it was possible to continue the mowing easily and continuously. In the case of the present invention in which the ring-shaped cutting protection guide 8 is installed, the machine can be moved freely from side to side and back and forth in order to reliably protect the rotary blade from large obstacles such as stones and metal. In addition, there is no need to worry about damaging important flowers, crops, and trees.

        The present invention relates to an improvement in a machine for cutting out weeds and the like.

A brush cutter of a mowing machine rotates a disc-shaped rotary blade with a saw blade by power to cut grass and the like.
Conventional brush cutters have the following drawbacks.
(1) Long grass is difficult to cut, and long grass after cutting cannot keep working.
(2) Even in the case of short grasses, the roots remain, so they will grow soon after cutting.
(3) Blades that rotate at high speeds are easily chipped or damaged by obstacles such as large stones and metals.
(4) In many cases, important flowers, crops, trees, etc. are damaged or cut.
Working while preventing these problems greatly reduces the efficiency of the original mowing.

In order to solve the problems of the above items (1) and (2), a rod-shaped cutting pin 2 that protrudes above and below the conventional rotary blade 1 is attached. The state is shown in FIGS. Two or more mowing pins 2 are attached while balancing the rotary blade 1. As for the mounting method, instead of directly fixing the cutting pin 2 to the rotary blade 1, the plate-shaped washers 3 and 4 are used above and below the shaft hole of the cutting pin 2 to further reduce the impact applied to the cutting pin 2. The absorbing and mowing pins 2 are attached to the original positions via elastic bodies 5 that facilitate instantaneous return. As the elastic body 5, hard rubber or the like can be used. The cutting pin 2 protruding from the lower part of the rotary blade 1 was confirmed to be very effective in removing weeds and the like by confirming the action of reducing the trimmed grass and cutting the grass roots. Further, the cutting pin 2 protruding above the rotary blade 1 is effective for trimming long grass.

The present invention further relates to a brush cutter characterized in that a ring-shaped cutting protection guide 8 having an inner diameter that is at least 20 mm larger than the outer diameter of the rotary blade 1 is attached.
The reason for attaching the ring shape is to protect the rotary blade 1 from obstacles such as large stones and metals, and to broaden the scope of protection so that necessary flowers, crops, trees, etc. are not cut away. It is. It is also extremely effective in preventing accidents caused by unexpected workers.

The present invention is characterized in that a bar-shaped cutting pin 2 that protrudes above and below a conventional rotary blade 1 is attached. The state is shown in FIGS. Two or more mowing pins 2 are attached while balancing the rotary blade 1. As for the mounting method, if the cutting pin 2 is directly fixed to the rotary blade 1 as a result of various tests, it is damaged immediately due to the impact applied to the pin and cannot be put into practical use. With respect to the mounting method, the elastic body 5 is not directly fixed to the rotary blade 1 but is used to absorb the shock that reduces the impact applied to the cutting pin 2 and to easily return the cutting pin 2 to its original position. It is characterized by being attached via. The rod-shaped cutting pin 2 used here is preferably made of a hard and rigid metal. For example, high speed steel or cemented carbide.
Other materials are not limited. As the elastic body 5, hard rubber or the like can be used.
FIG. 2 shows an example in which hard rubber is used as the elastic body. In this case, dish-shaped washers 3 and 4 are used above and below the rotary blade 1. The cutting pin 2 protruding below the rotary blade was confirmed to be very effective in removing weeds and the like by confirming the action of reducing the grass that was cut off and cutting the roots of the grass.
Further, the cutting pin 2 protruding above the rotary blade 1 is effective for trimming long grass, and even when the grass once trimmed is gradually cut and long grass grows, the trimming work is performed. There is an advantage that can be continued. It is also particularly suitable for trimming weeds that are intertwined with vine-like vines.

The present invention is characterized in that a ring-shaped cutting protection guide 8 having an inner diameter that is at least 20 mm larger than the outer diameter of the rotary blade 1 is attached. A metal ring is preferred.
To protect the rotating blade from obstacles such as large stones and metal, and to increase the scope of protection so as not to damage or mow the necessary flowers, crops, trees, etc., larger than the rotating blade, and The brush cutter is characterized in that it is attached with a ring-shaped edge cutting protection guide 8 to improve the work efficiency of edge cutting and to greatly improve the work efficiency.

As described above, the brush cutter according to the present invention to which the rotary blade 1 attached with the rod-shaped cutting pin 2 protruding above and below the rotary blade and the ring-shaped cutting protection guide 8 is attached is a weed, compared with a conventional machine. It has become possible to cut roots. Therefore, weed management became easier. In addition, weeding work became easier even with long grasses. In addition, weeds can be removed even in the case of weeds that are entwined with vines such as kuzu. Also, by attaching the ring-shaped cutting protection guide 8, the rotary blade 1 is protected from obstacles such as large stones and metals, and the life of the blade is considerably improved. It was also confirmed that necessary flowers, crops and trees could be prevented from being damaged or cut down, the workability was greatly improved, the efficiency of weeding work was improved, and the weeding time was greatly shortened. .
As described above, the effect of the present invention is extremely large.

Schematic diagram when the cutting pin 2 and the ring-shaped edge cutting protection guide 8 of the present invention are attached to the rotary blade 1 of the brush cutter When attaching the cutting pin 2 of the present invention to the rotary blade 1 of the brush cutter, the assembly diagram when the elastic body 5 is made of hard rubber and the parts 3 to 7 used for the assembly The figure which shows the assembly example of the ring-shaped edge cutting protection guide 8 used for this invention. The figure which shows the relationship between the rotary blade 1, the cutting pin 2, and the ring-shaped edge cutting protection guide 8 of a brush cutter. The figure which shows the example of the attachment metal fitting of the ring-shaped edge cutting protection guide 8

A commercially available engine-driven rotary blade and a brush cutter with an outer diameter of 255 mm are used, and a rod-shaped cutting pin 2 of the present invention shown in FIG. 2 is made of a metal with an outer diameter of 6 mm and a length of 50 mm. Attached as shown in FIG. A pair of dish-shaped washers 3 and 4 are used above and below the rotary blade 1, and the elastic body 5 is attached as hard rubber, and the cutting pin 2 is approximately 30 mm in total at the lower part of the rotary blade and approximately 30 mm at the upper part. Four pieces were attached so as to protrude 20 mm, considering the balance, and having an interval of 90 degrees. The diameter of the center line for attaching the cutting pin 2 is about 180 mm. Although it depends on the state of the grass to be cut, the outer diameter of the cutting pin 2 is preferably about 5 to 8 mm, and the length of the cutting pin 2 protruding below the rotary blade is preferably about 15 to 30 mm. The length protruding upward is preferably 25 to 50 mm. The material of the cutting pin 2 is preferably made of metal, and the surface thereof is preferably hard and rigid. For example, high speed steel or cemented carbide. The material is not limited. The dish type washers 3 and 4 used when assembling the cutting pin 2 are for facilitating the movement of the pin when an impact of an obstacle is applied to the cutting pin 2. In addition, the elastic body to be used has a very large effect because it absorbs the impact applied to the cutting pin to prevent the pin from being damaged and the pin can easily return to the original position. The elastic body is preferably made of hard rubber or the like, but the material is not limited.

By using the ring-shaped cutting protection guide 8, the range to protect the rotary blade from stone and metal obstacles is widened, so that the rotary blade 1 can be protected and mowing can be done without damaging important flowers, crops and trees. It can be performed smoothly, weeding work becomes easier, work efficiency increases, and work time can be greatly shortened. The size of the ring should basically be larger than the outer diameter of the rotary blade, but is preferably at least 20 mm or more and 80 mm larger than the outer diameter of the rotary blade 1. This time, it was 20 mm larger than the outer diameter of the rotary blade.
At this time, the thickness of the ring of the cutting protection guide 8 is preferably about 5 to 8 mm although it depends on the material. This time, the thickness was 8 mm. The material is preferably made of metal, but it can also be used with iron-cored plastic.

A conventional machine and actual mowing using a brush cutter, which is assembled as shown in FIGS. 1 and 2, with the cutting pin 2 and the cutting protection guide 8 described in the above [0009] and [0010] items attached thereto. Various comparative tests were conducted. As a result, in the case of the machine according to the present invention, in the case of short weeds, the cut grass becomes finer than the conventional machine, and the cut root does not leave the grass roots, and the grass is completely trimmed. It became a state to be able to. Next, a test was conducted in a place where long weeds with a plant height of about 50 cm were grown. As a result, with conventional machines, workability was poor and it was not possible to continue working. On the other hand, in the case of the brush cutter according to the present invention, even in the case of a long grass, it was possible to continue the mowing, and the weeds to be trimmed were shortened, and it was confirmed that the workability was greatly improved. . In the case of weeds with longer plant heights and intertwined vines such as kudzu, the conventional machines could not continue to cut. However, in the case of the machine according to the present invention, it was possible to continue the mowing easily and continuously. Further, in the case of the present invention in which the ring-shaped cutting protection guide 8 is installed, the machine can be moved freely from side to side and back and forth to reliably protect the rotary blade from large obstacles such as stones and metal. .
It was also confirmed that there was no worry of damaging important flowers, crops and trees, the work efficiency was good and weeding was completed in a short time, and the life of the cutting pin 2 was greatly extended.

Claims (3)

The present invention relates to a brush cutter for a mowing machine. Attach two or more stick-shaped cutting pins that protrude above and below the rotary blade of the brush cutter in order to make it easier to trim the roots of weeds and long grasses. A brush cutter with a ring-shaped guide for protection against cutting so as not to cut. 2. The method according to claim 1, wherein when the mowing pin protruding above and below the rotary blade is fixed firmly and attached, the mowing pin is immediately damaged, and therefore, a dish-shaped washer is used at the upper and lower sides and further attached through an elastic body. Brush cutter In order to protect the rotary blade and not to cut off important flowers, trees, etc., in order to widen the scope of protection, it is larger than the rotary blade, and its shape is attached with a ring-shaped cutting protection guide, The brush cutter according to claim 2, wherein workability is improved and work time is greatly improved.

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