JP2024083758A - Multifunctional weeder - Google Patents

Abstract

[Problem] Conventional weeders have a long repetition cycle of weeding, which takes time to weed, and most of them are single-function tools that repeat the same weeding operation. [Solution] The blade plate 1 is located just before the grip 14, and the force point and the action point are adjacent to each other to efficiently transmit the force of the arm to the blade, and the weeder is swung from the wrist or elbow to the left and right to scrape the ground, shortening the repetition cycle of the weeding operation and enabling high-speed weeding, thereby shortening the working time. The ground is scraped more easily by scraping with a blade that is inclined obliquely to the weeding direction and a bow-shaped blade. Weeding is possible by using both sides of the blade plate differently, and several types of weeding methods, such as turning the blade plate over and pushing the handle forward to remove weeds, have excellent weeding ability for single weeds. The combination of multiple blade shapes and multiple weeding methods makes the weeder small, lightweight, and simple in structure, yet multifunctional, and the optimal blade and weeding method can be instantly selected and used for each weed to be removed. [Selected Figure] Figure 1

Description

The present invention relates to a weeding tool whose main purpose is to remove relatively small weeds in gardens, fields, parks, etc.

Conventional weeding tools include those that insert the forked sharp tip into the base of the weed and use the principle of leverage to pull it out, and those that remove weeds by pulling the handle towards you while pressing the blade formed on the lower edge of the trapezoidal blade against the ground to scrape the ground.
Other types include sickle cutters that cut roots by moving a saw-like blade back and forth, ones that cut roots by sticking the front half of a wide, leaf-shaped blade into the ground, ones that press a long, flat blade in the front-to-back direction tightly against the ground and remove weeds by thinly scraping the ground left and right with the straight blade on the side edge, and ones with a step between the sickle handle and blade that allows the blade to penetrate under the ground and the handle to be pulled towards you to cut roots and remove weeds.

The weed puller in Patent Document 1 uses the principle of leverage to pull out the weeds one by one by inserting the sharp, forked tips into the base of the weeds, placing the fulcrum on the ground, and pushing down on the rear of the handle.

The weeding tool of Patent Document 2 places a blade on the ground on the opposite side of the weed to be removed, and pulls the handle toward oneself while pressing the blade against the ground, thereby scraping off the weed together with the ground to remove the weed.

The weed root cutting tool of Patent Document 3 cuts the roots by inserting a saw-shaped blade into the ground and moving it back and forth.

The application documents for the weed puller in Patent Document 4 state that it operates back and forth to cut the roots of grass.
The front half of the blade is inserted into the base of the weed, cutting it at the root and removing it.

The specification for the weeding tool in Patent Document 5 states that if the blade 4 is made parallel to the soil surface and the tool is used to scrape off the grass as if shaving, the grass can be easily cut. The blade is placed in close contact with the ground and the ground is thinly scraped left and right to remove weeds.
The front blade is inserted into the base of the weed and the grip is pressed down to use the principle of leverage to dig up the roots and remove the weed.

The root-cutting weed remover in Patent Document 6 is shaped like a sickle, with a step so that the blade is lower than the handle. The blade is inserted below the ground surface and the handle is pressed downward while being pulled toward the user to remove the weed by scraping off the roots together with the ground.

Although Patent Document 7 does not describe how to use the root cutter, it can be assumed that the blade at the front of the blade plate is used to insert into the base of weeds in relatively soft ground to cut the roots, the straight blade on the right edge is used to swing it to the right to scrape off the weed together with the ground, and the saw-shaped blade on the left edge is pressed against the right side of the weed and moved back and forth to cut the roots.

JP 2002-84801 A JP 2009-45046 A Japanese Utility Model Application Publication No. 3-18701 Japanese Patent Application Laid-Open No. 63-237701 Japanese Utility Model Application Publication No. 59-16301 JP 2018-183127 A Design Registration No. 857785

The weed puller in Patent Document 1 requires the operator to insert the tip of the weed into the base of each weed and then push down on the rear of the handle to pull out the weed, which makes weeding time-consuming and inefficient, and makes the weed puller unsuitable for removing a large number of weeds.

The weed cutter of Patent Document 2 has a blade section and a handle connected via a handle, which is the described handle, and the presence of this intermediate support handle makes the length from the handle to the blade section longer.
For this reason, when the user presses the gripped handle downward and pulls the handle toward him/her while pressing the blade against the ground, the force with which the blade is pressed against the ground is weak because the distance from the point of force to the point of action is long.
Therefore, it is designed so that the two hands share the tasks of pressing the tip of the blade against the ground and pulling the handle towards you by holding the top of the blade with the other hand.
However, because the hand holding down the upper side of the blade blocks the view of the weeds to be removed, it is necessary to repeatedly place the blade on the ground to remove the weeds and then place the other hand on the ground to press down the upper side of the blade. This operation is extremely cumbersome and has the disadvantage of lengthening the repetition cycle of the weeding operation.
This weed cutter scrapes the ground with a fixed blade width, so when scraping off sparsely grown weeds one by one, it has the drawback of scraping off more ground than necessary. Also, the direction in which the blade is pressed and the direction in which it is scraped off are not the same, so it is difficult to keep the depth of the blade scraping the ground constant, and it is difficult to scrape off an extremely thin layer of ground.
Because the weed removal method involves pulling the handle towards you to scrape the ground with a fixed blade width, it has the disadvantage that it cannot be used to remove weeds in areas narrower than the width of the blade.

The root cutting tool in weed soil described in Patent Document 3 cuts roots by moving the saw blade back and forth underground, but the root cutting tool shown in the drawings of this document is limited to use in relatively soft ground, as it is impossible to penetrate the blade into the ground in hard-packed ground such as that found in a schoolyard.
The weeding method of cutting the roots by moving a saw blade back and forth is effective for cutting large weeds or weeds with stubborn roots, but the saw blade has the disadvantage of easily becoming clogged with cut roots.
However, in the case of small weeds, it is quicker and easier to remove them by scraping them off with a weed cutter with a normal blade rather than by running a saw blade back and forth underground to cut the tough roots, so this root cutter is designed to remove large weeds in relatively soft ground.

The weed puller of Patent Document 4 has a wide, leaf-shaped blade plate with a nearly vertical edge at the rear half of the side edge, and the drawings do not clearly show any blade-shaped parts on the side edge of the blade plate.
Therefore, this weed puller is designed to cut the roots by inserting it into the base of the weed.
The arched edge at the front half of the side edge is not designed to remove weeds by scraping the ground. Weeding by root cutting or digging is inefficient, and it is not suitable for long-term work to remove a large number of weeds.

The method of using the weeding tool of Patent Document 5 is as described in the above-mentioned "Background Art." As a result of making and using a prototype of an equivalent tool, it was found that the grip holding part of the weeding tool is located high above the ground when the tool is in the position for weeding, which causes problems in operation.
The prototype, based on the size of the grip, is 220 mm long and 100 mm high.
The length of the blade protruding forward is 85 mm.
When the blade on the side edge is used to cut off weeds to the left and right, in other words, when the back surface of the blade plate is in close contact with the ground, the height from the ground to the center of the thickness of the grip holding part is 85 mm and the grip holding part is in a nearly horizontal position, which requires the user to bend their wrist upwards while weeding, making it unsuitable for long-term work.
The operation of pressing the underside of the blade against the ground and cutting left and right is limited to small weeds with shallow roots, but since the load on the blade is light, it is possible to cut off the weeds together with the ground. However,
Because it is rather large in size and the grip is high, it is difficult to swing it from side to side to remove weeds, and it is not suitable for long-term work such as removing a large number of weeds.
Because the grip is high and has a large difference in height from the ground, when it comes to small, rooted weeds or slightly large weeds, the entire weeding tool tilts significantly in the direction of the weed the moment the blade is loaded, making it difficult to cut them down. Weeders like this one, which cut weeds by swinging a straight blade almost perpendicular to the weeding direction back and forth, have the disadvantage that if the difference in height from the underside of the blade plate to the underside of the front end of the grip is large, the weeding tool will easily tilt in the direction of the weed when the blade is loaded.
The tool shown in FIG. 3 of this document is used for weeding by moving the saw blade back and forth, so the weeding speed is slow and it is not suitable for removing a large number of weeds.
Therefore, the main use of the straight blade on the side edge is to remove small weeds with shallow roots by swinging the weeder left or right with the entire underside of the blade in contact with the ground, scraping the ground very thinly.
The front blade of the blade plate is for removing larger weeds, by inserting it into the base of the weed and using the principle of leverage to dig up the roots.
It is difficult to insert the blade into the ground, and the large step makes it difficult to use for digging up, and the long blade makes it difficult to operate, making it impossible to remove weeds in short repetitive cycles.

The root-cutting weed remover in Patent Document 6 has a shape similar to that of a sickle, with the cutting blade and gripping bar intersecting at almost a right angle and a step provided between the cutting blade and the gripping bar to prevent interference between the fingers holding the gripping bar and the ground.
The cutting blade penetrates below the ground and the gripping rod is pressed downward while being pulled toward you to cut the roots and remove weeds.
When cutting weeds with a sickle, the above-ground stem is cut off, so there is no need to press the blade against the ground, but to scrape off the roots below ground, it is necessary to pull the gripping bar towards you while pressing the entire width of the blade downward. However, because the entire cutting blade protrudes to the side of the gripping bar, the closer you get to the tip of the cutting blade, the greater the distance from the gripping bar becomes, which has the drawback that the force pressing the blade downward weakens, so it is necessary to apply a force to rotate the gripping bar counterclockwise and pull the gripping bar towards you while pressing it evenly up to the tip of the cutting blade, which creates problems with operability.
The weeding operation is repeated about once per second, and like the weeder in Patent Document 2, it cannot be used in places narrower than the width of the cutting blade or in narrow places with obstacles around. When weeding a single weed,
It has the disadvantage of cutting into the ground more than necessary.

Assuming that the diameter of the handle is 30 mm, the root cutter of Patent Document 7 has a blade plate length of about 260 mm and a maximum width of about 147 mm. The height from the bottom surface of the blade plate to the bottom surface of the front end of the handle is about 117 mm, and the length of the handle is about 167 mm. The inclination angle of the handle with respect to the blade plate is 40
It is degrees.
Since the handle is approximately 167 mm long, this root cutter can be operated with one hand, but because the blade plate is of a large size and therefore quite heavy, swinging it to the right to scrape off the ground where weeds are with the right edge of the blade places a heavy strain on the arm, making quick weeding impossible and causing considerable arm fatigue, making it unsuitable for long periods of work.
The straight blade on the right edge is about 227 mm long, and although it can shave widely, the force with which the blade scrapes the ground is distributed over the entire length of the blade, so it is weaker than a blade with a shorter length, making it difficult to remove weeds with deep roots, and the weeds that can be scraped are limited to relatively small ones. In the front view, the straight blade is inclined at about 14 degrees to the handle, but when holding the handle and scraping to the right, the effect of tilting the blade at this angle is small.
Because the blade is large, it is impossible to cut off weeds by swinging it to the right in places with obstacles nearby or in narrow spaces.
Because the height from the underside of the blade plate to the underside of the front end of the handle is approximately 117 mm, when using the straight blade to cut weeds to the right, there is a disadvantage that when a load is applied, the handle rotates and the entire tool tends to tilt in the direction of weeding.
When the handle is tilted at a steep angle of 40 degrees to the blade, the tool is moved to the right to scrape the ground.
The operation of moving the blade on the left edge back and forth to cut weeds is difficult to operate and difficult to use.
As a tool to be operated with one hand, it is too large and heavy, which makes it difficult to operate and unsuitable for long-term work. If the length of the blade plate were reduced to one-quarter or less, it would be easy to operate with one hand, but the handle diameter would be about 8 mm or less, which would make the handle too thin.
It becomes difficult to get a firm grip.

Among the weeders described in the above patent documents, the straight blades in Patent Documents 2, 5, 6, and 7 are used to remove weeds by scraping the ground, and all of them remove weeds in a direction approximately perpendicular to the blade. Patent Documents 2 and 6 are used to remove weeds by pulling the handle toward you, so they are not suitable for scraping by pulling the handle diagonally backward.
The straight blades of Patent Documents 5 and 7, when viewed in a plane when in use, can be tilted diagonally relative to the weeding direction to perform cutting operations, but because the grip is positioned high, they are difficult to operate and unsuitable for repeating weeding operations in short cycles.
When weeding, if it were possible to scrape the ground by tilting the blade at a certain angle or more with respect to the weeding direction 55 as shown in Figure 7 in a plan view, the weeding width would be narrower, but this would have the advantage that it would be easier to scrape off slightly hard ground or weeds with deep roots. However, it does not appear that any conventional weeding tools are designed to achieve this effect.

The problems with the weeding tools described in the above patent documents have been described above, but the weeding tools described in patent documents 1 to 4 and patent documents 6 and 7 all have the disadvantage that they use the whole arm to operate, making it difficult to perform quick weeding and requiring a long repetition period for weeding. The weeding tools described in patent documents 5 and 7 have a high grip, which makes them difficult to operate and unsuitable for weeding that is repeated in a short cycle.

There are various known weeding tools that remove weeds by scraping the ground, but all of them remove weeds by uniformly scraping the ground in a thin strip of approximately the same width, and it appears that none of them can be used in conjunction with a weeding method that removes weeds by instantly scraping the ground around the weeds in a small, concave shape.
From the perspective of a weeder, when removing scattered small weeds,
It is sufficient to scrape the ground around the weeds in a narrow width, and there is no need to scrape it wide. If there was a weeder that could scrape the ground in two ways, one to scrape the ground in a wide, thin width to remove multiple weeds at the same time, and the other to scrape the ground around the weeds in an instant in a small width, it would be easier and more convenient to use.
If a weeder with a blade and a grip adjacent to each other, a low grip, and a left-right weeding system can cut in two different ways, it is easier to use because the weeding operation can be repeated in short cycles. If the two types of cutting can be done in the same weeding direction, it will be even easier to use.

In addition to the shape of the blade and the method of operation, the size and shape of the handle are also important factors in determining the ease of use of a weeder. The handle is the point of contact where the force of the arm is transmitted to the blade and weeding claws, and it is desirable for it to fit comfortably in the hand, be able to be held firmly without discomfort, reduce arm fatigue, be less slippery, transmit little force, and be capable of weeding for long periods of time.
The thickness of the grip of commercially available weeders that can be operated with one hand is often 80 mm to 90 mm in circumference, and some are equipped with a flat handle with a circumference of 60 mm.
A handle with a short circumference of the gripping part has a small contact area with the palm and fingers of the gripping hand, so it is difficult to obtain a sufficient gripping force and is not suitable for long-term work. A handle that is as thick as possible is desirable.
When we tried making prototypes with the same blade but with thick and thin handles and comparing them, the difference in ease of use was clear. The quality of the handle makes all the difference in the feel of the knife, and the size and shape of the handle greatly affect ease of use in practical terms.
(Description of the main points of the weeding tool of the present invention)

To put it simply, the weed killer of the present invention in general has an extremely fast weed killing speed, which is a feature not found in other weed killers, and although it is small, lightweight, and has a simple structure, it is capable of performing a wide variety of weed killing methods.
The common shape of the weeding tool of the present invention is a blade body composed of a blade plate, a rising portion, and an attachment portion,
The blade plate is attached to the front part of a rod-shaped handle, and the relative positions of the blade plate and the handle are in a basic positional relationship as described below in (Explanation of Terminology), i.e., the front end of the blade plate protrudes forward from the handle, and the rear end of the blade plate is located below the underside of the front end of the handle.
The weeding tool of the present invention, by virtue of the synergistic effect of this common shape, the handle shape, and the blades of various shapes, is capable of high-speed weeding and ease of use not found in conventional weeding tools.
In addition to flat blade shapes, there are also bent blade shapes, weeders in which the side edge of the straight blade of the weeder in Figure 25 is bent slightly diagonally downward as shown in Figures 26 and 27, twisted blade shapes, and blade shapes like an upside-down spoon. The edge shape of the blade plate can be straight, bow-shaped, obtuse-angled, or pointed at the front.
These blade shapes are modifications of the blade shape of the weeding tool of Example 1 shown in FIG. 1, which is a representative shape of the present invention.
The front and back of the handle are made thin, allowing for an extremely easy weeding method, with the blade turned over to remove weeds, a distinctive feature not found in other weed removers.
By arranging blades of different shapes on the left edge, right edge, front edge, or the same side edge of the blade plate, the user can frequently select and use multiple blade shapes while weeding, making it easier to use and enabling weeding in a shorter time.The main functional features are as described in (i) to (j) below.
(stomach)

It is small and lightweight, has a fast weeding speed, and reduces working time.
The blade is located just in front of the handle, so the handle can be held low and close to the ground as shown in Figure 5, and because the grip is adjacent to the blade plate, the force of the arm can be transmitted efficiently to the blade plate. The shape of the weeder is suitable for swinging it left or right to scrape the ground with the blade on the side edge, and this weeding method allows the weeding operation to be repeated in short cycles.
The weeding method of swinging a weeder of this shape from side to side to scrape the ground has the advantage that the weeding operation can be repeated at high speed compared to the weeding method of pulling the handle towards you to scrape the ground. When swinging the elbow from the elbow from side to side, the weeding operation can be repeated about 2 to 3 times per second, and when swinging the wrist from the wrist from side to side, the weeding operation can be repeated about 3 to 4 times per second. A weeder that can repeat the weeding operation at such high speed is not found in conventional weeders. By using the method of Figure 9, the point of force and the point of action are closer to each other, making weeding easier.
The weeding tool in Patent Document 5 uses a blade on the side edge to cut off weeds, but because the grip is located at a high position, there is a drawback in that when a load is applied to the blade, the entire weeding tool tilts toward the weeding side.
The weeds to be removed are limited to small ones with shallow roots that can be removed by placing the blade in close contact with the ground. The grip is located high up, making it difficult to operate, and it is not suitable for repeated high-speed cutting of the ground.
(B)

When weeding, the blade cuts the ground in a direction that is not perpendicular to the ground, making it difficult to cut ground and
It can also handle established weeds.
Conventional weed removers that cut off weeds cut in a direction nearly perpendicular to the blade, whereas the weed remover of the present invention mainly cuts in a direction not perpendicular to the blade, but can also cut in a perpendicular direction.
In Patent Documents 5 and 7, the straight blades on the side edges are not perpendicular to the weeding direction, but the angle of the blades relative to the weeding direction is close to 90 degrees, so the effect of inclining the blades is small.
This operation allows you to feel the difference in ease of weeding compared to forcibly weeding in a direction perpendicular to the blade, as shown in Fig. 7, where the blade direction when viewed from above is inclined with respect to the weeding direction 55, or in Fig. 12, where the bow-shaped blade turns and strokes the ground, similar to how it is easier to cut with a sliding knife blade compared to cutting in a direction perpendicular to the blade.
In the blade inclined in the weeding direction as shown in FIG. 7, as the degree of inclination increases, the blade protrudes more to the side of the handle, causing the blade plate to become unbalanced from left to right. However, this defect can be corrected by shifting the blade plate.
What is noteworthy about this weeding method, which uses a blade inclined to the weeding direction, is the technique of cutting the ground in the Y direction or close to the Y direction in Figure 10. Although the weeding width is narrow, the ground can be cut lightly, making it very easy to use and allowing you to feel the difference in sharpness. Details are as described in the explanation of how to use the weeding tool in Example 1.
The second point to note is the weeding method in which, in the weeding posture shown in Figure 18, the blade is angled at about 60 degrees to the ground, and the handle is pushed in the direction b, which is slightly diagonally forward from the tip of the blade, to cut off the weeds with the convex bow-shaped blade. This method is effective even on relatively hard ground, and although the cutting width is narrow,
This is an excellent weed removal method that allows for easy cutting operations.
Other techniques that make it easier to remove weeds include moving a bow-shaped blade in an arching motion, swinging the blade from side to side is suitable for quickly removing small weeds, and rotating the blade is suitable for removing weeds with established roots.
(C)

By adopting a handle with a thin front part, interference between the front part of the handle and the ground can be avoided, and even with a blade plate with a relatively short length, several easy-to-use weeding methods are possible, such as pushing the handle forward and downward with the blade plate turned upside down, and a variety of weeding methods can be used by using both sides of the blade plate appropriately.
In the front view of Example 1 of the weeder of the present invention, shown in Figure 3, the blade plate is shaped to be inclined with respect to the center line of the handle. Therefore, in addition to the position shown in Figure 5, in the position shown in Figure 15 or a weeding position similar to that shown in Figure 15, it is easy to push the handle to scrape the ground, chip the ground, dig up the ground, and weed hard ground or ground mixed with pebbles. It is also possible to use both the front and back sides of the blade plate to selectively weed, providing an ease of use not found in conventional weeders.
Each weeding method, in which the blade is turned over and the handle is pushed to cut off weeds, is extremely easy to use as the blade and handle are at an optimal angle to the ground, and is used frequently and is an excellent method of use that is not found in other weed removers, greatly improving operability and further increasing the options for weed removal methods, and is the most distinctive feature of the weed remover of the present invention.
It is difficult to describe in words how easy this weeding method is to use, but the fact that the weeding can be done lightly, smoothly, and comfortably with an appropriate angle between the ground and the handle that is easy to work with relieves the mental fatigue of the worker and reduces arm fatigue during long hours of work. Details of how to use the weeding tool are as described in the instructions for use of each example.
(D)

By providing a convex-arch shaped blade on the side edge, a variety of weeding methods can be used.
The present invention has a common shape, as shown in FIG. 1, which has a handle with a thin front part.
Or, in a weed remover in which the side edges of the blade plate are inclined relative to the center line of the handle when viewed from behind, the convex-bow shaped blade on the side edge of the blade plate makes it possible to remove weeds with the blade plate turned upside down, and is a convenient and easy-to-use blade that can be used for a variety of purposes, such as smoothing, pushing, concave cutting, rotating, and weeding by cutting into the ground, and details are as described in the explanation of how to use the weed remover in Example 1.
The weed puller in Patent Document 4 does not explicitly show a blade on the convex, arched edge of the front half of the blade plate, and even if a blade is formed, the blade that can be formed is only about half the length of the edge, and when the ground is scraped left and right or scooped up, the lower part of the upright edge of the rear half interferes with the ground and becomes an obstacle to weeding.
(E)

The blade plate can be provided with a plurality of weed-cutting functions by forming blades of different shapes on the left, right and front edges.
In the weed remover of Patent Document 2, in which the handle is pulled towards the user to cut off weeds, there is only one edge on which a blade is formed, but in the weed remover of the present invention, blades of different shapes can be formed on the front edge as well as the left and right edges, and the weed remover can be used with the blade plate upside down, making it possible to accommodate a wider variety of weed removal methods.
The straight blades formed on the side edges are for flat cutting and are suitable for cutting off multiple weeds in one weeding operation, while the convex arched blades are suitable for cutting off a single weed, allowing a variety of weeding methods to be used.
The leading edge of the blade is suitable for cutting.
By providing blades of different shapes in this manner, it is possible to provide the functions of a number of weeding tools, and this has the advantage that blades of different shapes can be used frequently and selectively.
A blade plate with a symmetrical shape, with the same blade shape formed on the left and right edges, has the advantage that it can be used equally well by either left-handed or right-handed people, as it can scrape the ground in both directions under the same conditions.
When the blade on one side edge becomes worn, the blade on the other side edge can be used as a spare blade.
(F)

The direction in which the blade presses against the ground is the same as the direction in which it cuts the ground.
The weeding operation of the weeding tools in Patent Document 2 and Patent Document 6 is a method of removing weeds by scraping the ground.
The direction in which the blade is pressed and the direction in which it is scraped are different, so you need to press the blade against the ground while simultaneously pulling the handle towards you.
In the weeding tool of the present invention, the direction in which the blade is pressed and the direction in which the ground is scraped are the same whether it is scraped left and right or pushed forward to use both sides of the blade plate to scrape the ground with the front edge blade, so the blade is moved simultaneously by pressing the blade, which is a feature that makes it extremely easy to operate. In the weeding position of Figure 5, the handle can be held at a low position close to the ground, so the blade plate is less likely to wobble, and the blade can be held down effectively, allowing the weeding operation to be repeated in short cycles by swinging it left and right.
In the straight blades of Patent Documents 5 and 7, the blade is pressed in the same direction as the ground is scraped, but the height of the gripping portion is high, making it difficult to operate, and when a load is applied, the handle rotates, making the weeder prone to tilting, making them unsuitable for applications requiring repeated weeding operations at high speed.
(to)

By forming blades on the front edge and the left and right edges, you can remove weeds in the left, right, front, rear and diagonal directions.
The weeder of the type described in Patent Document 2, which scrapes the ground by pulling the handle toward you, can only scrape in one direction, but the weeder with the above blade can scrape in the left/right direction, forward direction, diagonally forward direction, and diagonally backward direction. A weeder with a straight blade with a blade angle of less than 90 degrees can select the weeding direction as shown in Figure 10, and when scraping in the Y direction, the scraping width is Y1 in Figure 11, so although the scraping width is narrow, it has the advantage of being easy to weed and can be used on difficult ground.
(blood)

The weed remover having the type 1 bending blade and type 2 bending blade shown in Figures 30 to 33 makes it easier to scrape flat and concave surfaces. Details are as described in the weed remover of Example 7.
(R)

In the blade plate shown in FIG. 37, the blades formed on the edge of the same twisted side, left or right, can be selected by simply rotating the handle, and the angle between the same handle and the ground,
The blade has an appropriate angle with respect to the ground, and is easy to use, and has the advantage that multiple blades can be used to weed in the same weeding direction. Details are as described in the explanation of the weeding tool in Example 8.
(Nu)

The weeder having a blade plate shaped like an upside-down spoon as shown in Figures 40 to 42 can perform two weeding operations in one stroke by pressing the blade against the ground and swinging it from side to side, and can also be used for a variety of other purposes.
Details are as described in the explanation of the herbicide in Example 9.

A common problem with conventional weeding tools that are operated with one hand is the drawback of a slow weeding speed. In order to improve this problem, the weeding tool of the present invention has improved operability and weeding speed by improving the structure of the weeding tool body, the shape of the blade, the shape of the handle, and the weeding method.
In contrast to a single-function weeding tool that repeatedly uses a single weeding method, the small, lightweight weeding tool of the present invention that can use multiple weeding methods in combination provides ease of use not found in conventional weeding tools.
While most conventional weeders have a single function, the weeder of the present invention can form different shaped blades on the left edge, right edge, and front edge of the blade plate, allowing the optimum blade and weeding method to be instantly selected for each weed to be removed, and has the characteristic of being able to use a variety of weeding methods at high speed despite its simple structure. The weeder equipped with a handle with a thin front part can remove weeds with the blade plate turned upside down even with a blade that is relatively short in length, further expanding the options for weeding methods.
By making it possible to weed with the blade upside down, both sides of the blade can be used, resulting in a weeding tool that is both easy to use and has high weeding ability.
In addition, a weed trimmer having two types of blades formed on the same edge has the advantage that the two types of blades can be used in the same weeding direction, which is convenient, compared to a weed trimmer having one type of blade each formed on separate left and right edges.

In the weeding method, the technique of pulling out weeds one by one takes a long time no matter how good the weeding tool used, and is an extremely inefficient weeding method.
In contrast, the weed removal method of scraping off the weeds along with the ground can simultaneously cut the roots and separate the weeds from the ground. This method is faster than the weed removal method of pulling out the weeds, and is suitable for removing large numbers of weeds.
The weeder of the present invention enables efficient weeding work by weeding operations that cut off weeds in the left and right directions, forward, diagonally forward, diagonally backward, and backward directions.

The weeding tool of the present invention is basically operated with one hand, and by using a small rake in the other hand, the weeding can be done while removing the weeds that have been removed, making it easy to see which weeds have been missed and allowing for efficient weeding work.

In order to solve the problems of conventional weeders, the weeder of the present invention is a small, lightweight weeder with a low weeding posture, and has a shape suitable for swinging the weeder from side to side to scrape the ground with the blades on the side edges of the blade plate attached to the front of the rod-shaped handle, and it is possible to repeat the weeding operation in short cycles, thereby shortening the time required for weeding.
The essential conditions for enabling this high speed weeding are that the height of the rising part of the blade body is low, and that the blade plate is positioned immediately before the handle, which is the basic shape of the present invention.
The operation of scraping the ground from side to side with a weeder with a low handle has the advantage that it can be repeated in short cycles and can remove weeds quickly, compared to a weeder that scrapes the ground by pulling the handle towards you. If blades are formed on the left and right edges of the blade plate, high-speed weeding in either direction is possible.
With the weeding tool of the present invention, the direction in which the blade is pressed and the weeding direction are the same whether the weeding tool is used for weeding by swinging it from side to side or for weeding by pushing the handle forward to cut off the weeds, so compared to weeding tools in which the direction in which the blade is pressed and the direction in which the weeding is cut off are different, weeding can be done by simply moving the blade back and forth, allowing for fast, repeated operation.
The weeder of the common shape of the present invention can have its handle held low and close to the ground as shown in Figure 5, making it suitable for weeding by cutting off weeds to the left or right with the blade on the side edge. Such a weeder, which allows the weeder to be swung back and forth using the wrist or elbow as a fulcrum to quickly and repeatedly weed, is not found in conventional weeders.
By placing the blade plate and the gripping part adjacent to each other and bringing the point of force and the point of action closer together, the blade plate is gripped close to the gripping part.
The shape of the weed cutter allows the power of the arm to be efficiently transmitted to the blade plate when pressing the blade against the ground and swinging the weed cutter from side to side.
As shown in Figures 8 and 9, if you place your index finger on the front top surface or front right side of the handle,
Furthermore, it is possible to increase the force with which the blade is pressed against the ground and the force with which the blade is pushed to the left. When weeding with the right edge of the blade, the thumb can be placed on the front left side of the handle to increase the force with which the blade is pushed to the right.
This operation of bringing the point of force close to the blade and encouraging the index finger or thumb to push the blade in the weeding direction is made possible by placing the blade plate and the handle adjacent to each other, and is very easy to use. It makes it easier to weed by swinging the weeder back and forth at high speed, and is an excellent way of using the tool that allows you to feel the difference in operability. Place your index finger on the blade as shown in Figure 9 and push it in the direction from the X direction to the Y direction in Figure 10.
The operation of weeding in any direction is easier to scrape the ground and is a more user-friendly method.
However, weed cutters with a large step at the rising portion or weed cutters with a large distance between the blade and the front end of the handle are not suitable for this operation because the point of force and the point of action are far apart.
In the weeding tools described in the above-mentioned patent documents, which are operated using the entire arm, when continuous weeding operations are performed, the number of repetitions is about once per second, and it is difficult to perform operations twice per second in succession.
On the other hand, in the method of the present invention in which the weeder is swung left or right and the blade on the side edge cuts off weeds together with the ground, there is no need to move the whole arm, and weeds can be removed by swinging the elbow or wrist from side to side, so continuous weeding operations are possible about 2 to 4 times per second, which has the advantage of shortening the time required for weeding.In the weeding method of pushing the handle and cutting off weeds with the blade on the front edge of the blade plate, as shown in Figure 15, small weeds can be removed one by one by placing the blade on the front edge against the base of the weed and pushing the handle forward by 20 mm to 30 mm, so weeding operations can be performed 2 to 3 times per second.

As a second solution to the problem, by cutting with a blade inclined at an angle to the weeding direction 55 as shown in Figure 7, it is easier to scrape off the ground compared to cutting in a direction perpendicular to the blade. The straight blade 6 of the weeder in Figure 2 is an example of an obliquely inclined blade.
A blade that is inclined at an obtuse angle to the weeding direction has the same effect, but compared to a blade with an acute angle, when the blade wears down and becomes dull, it is more likely to slip and escape.
Just like a peeler with a blade attached at an angle, by moving the pressed blade at an angle, you can scrape the ground more easily. When pruning garden trees, it is difficult to cut thick branches with scissors in a direction perpendicular to the branch, but it is easy to cut with the blade at an angle. Similarly, a blade inclined to the weeding direction is effective for hard-to-scrape ground and weeds with stubborn roots.
When you swing the weed trimmer from side to side using your wrist or elbow as a fulcrum, the blade moves in a bow-like path.
When the side edge of the arched blade is swung to the left or right, the arched blade moves in an arching motion, and this method of weeding, in which the blade swings in a stroking motion to scrape the ground, has the same effect.
However, in the case of the blade inclined with respect to the weeding direction 55 in Fig. 7, as the blade angle 20 decreases from 90 degrees to 0 degrees, the blade plate protrudes significantly to the side of the handle, causing the left and right balance of the weeder to deteriorate, but this can be corrected by shifting the blade plate.
The blade plate has been shifted to the right to correct the balance.
In FIG. 2, as the blade angle 20 becomes smaller, the width of the cutting to the left becomes narrower, but since the cutting is done in a manner that strokes the ground, there is an advantage that cutting is easier.
As shown in FIG. 10, the linear blade 6 of FIG. 1 is arranged in a range of 90 degrees from the X direction to the Y direction.
The weeding direction can be selected as desired, and the weeding width is maximum at Z1 in the Z direction and minimum at Y1 in the Y direction in Figures 10 and 11. In the Y direction, the blade angle is 150 degrees to the weeding direction, so the weeding width is 50% compared to the Z direction perpendicular to the weeding direction, but it can be shaved more easily with less force and has an improved sharpness when used.
This operation of pulling the handle in the Y direction or close to the Y direction to scrape the ground is very easy to use and is a technique that you will want to use often.
The operation of cutting in the X direction has the advantage that the weeding can be performed by swinging the weeding tool from side to side, and therefore the repetition period is shorter than that in the Y direction, and high-speed weeding can be achieved. In Figures 10 and 11, the weeding width in the X direction is 86% of that in the Z direction.
By selecting the weeding direction, the ground that is easy to scrape is scraped to the maximum width and the ground that is difficult to scrape is scraped to the minimum width, so that it is possible to weed the ground that is difficult to scrape and also to scrape weeds with deep roots, and it becomes easy to scrape them off.
Compared with a blade perpendicular to the weeding direction, an inclined blade has a narrower cutting width, but the angle of the blade plate to the ground is stable and less likely to wobble, there is less variation in the cutting depth of the ground, and it has the effect of preventing the blade from penetrating too deeply into the ground.
In FIG. 3, if the height difference of the rising portion 2 becomes large, the weeder is likely to tilt in the weeding direction when a load is applied. However, the linear blade inclined to the weeding direction in FIG. 2 is at a blade angle of 20.
The advantage of this is that the blade is less likely to tilt as the angle difference from 90 degrees increases. A blade inclined in the opposite direction to the weeding direction has the same effect.
In the weeding tool of the present invention, most of the weeding operations in which the straight blade scrapes the ground are performed by a blade inclined relative to the weeding direction.

The third solution to the problem is to adopt a convex-bow shaped blade, in which a blade is formed on the arch-shaped protruding edge of the blade plate. The blade 7 on the right edge of the weeder in Fig. 1 is an example of a convex-bow shaped blade. This type of blade has the advantage that it can be used for multiple purposes, as it can cut weeds by using both sides of the blade plate.
The weeding tool shown in Fig. 3 has a blade inclined relative to the center line of the handle and a handle with a thinner front part, and the convex arch shaped blade formed on the side edge of the blade can be used for many purposes such as pushing, smoothing, concave cutting, turning, weeding by cutting the ground, crescent cutting, etc., and can be used to weed using many different weeding methods, making it extremely valuable. Details of the many different weeding methods are as described in the explanation of how to use the weeding tool in Example 1.
The convex bow-shaped blade on the side edge is also suitable for weeding in recessed areas that are difficult to cut with a straight blade.
It is also effective in removing weeds that grow close to the sides of stones or walls.

As a fourth solution to the problem, Example 7, Figs. 30 to 32, shows a weeder equipped with a type 1 bending blade on the left edge and a type 2 bending blade on the right edge. The type 1 bending blade makes it easier to scrape flat surfaces, and the type 2 bending blade makes it easier to scrape concave surfaces. Details are as described in the explanation of each blade and in the explanation of Example 7.

As a fifth solution to the problem, Example 8, Fig. 37, is a weeding tool with a twisted blade. The twisted blade can select one of multiple blades formed on the edge of the side with the left or right twisted blade by simply rotating the handle, so there is an advantage that the angle between the handle and the ground is constant, the angle between the blade plate and the ground is an easy-to-use moderate angle, and multiple blades can be used separately to weed in the same weeding direction that is easy to use. Details are as described in the explanation of the weeding tool in Example 8.

As a sixth solution to the problem, Example 9 (Figures 40 to 42) shows a weeder equipped with a blade plate shaped like an upside-down spoon. The feature of this weeder is that the blades on the left and right edges are shaped to contact the horizontal surface at the same time at a moderate inclination angle, so when the weeder is swung left and right, one round trip can scrape the ground in both directions, one time each, making for efficient work. This weeder with a blade plate shape can also be used for many other purposes.

The seventh solution to the problem is to improve the shape and thickness of the handle.
The first improvement is that the thickness of the front part of the handle is made thinner than the thickness of the handle itself.
No. 32 is the part where the front top surface of the handle has been cut away to make it thinner.
Unlike simple chamfering, this shape enables an extremely easy-to-use weeding method in which, even with a blade having a relatively short blade length, the front part of the handle does not interfere with the ground when the blade is turned upside down in the weeding position shown in Figure 15, and the handle is pushed in this position to scrape the ground with the front edge of the blade and remove weeds.
The weeding tool shown in Fig. 1 has a convex arched blade extending from the front edge to the side edge, is equipped with a handle of this shape, and has a blade plate inclined with respect to the center line of the handle. In a weeding posture similar to that shown in Fig. 15, it is possible to weed by cutting up the ground, by smoothing, by scraping, by scraping in a crescent shape, by digging up weeds, and by weeding hardened ground or ground containing pebbles. By making it possible to use both sides of the blade, the weeding function is expanded. Details of these weeding methods are as described in the explanation of the method of using the weeding tool in Example 1.
The second improvement is that the thickness of the rear part of the handle has been made thinner so that in the weeding method shown in Figure 15, in which the blade is turned over, the rear part of the handle is held in the palm of the hand, and the handle is pushed to remove weeds, the rear part of the handle fits snugly against the palm of the hand, eliminating the uncomfortable feeling of the corners of the rear part of the handle hitting the palm, making it easier to grip and push.
In Figure 3, 33 denotes a cut-out portion at the rear of the handle. A handle of this shape has the advantage that it is very easy to grip with the blade upside down, there is no slippage, and it is easy to push the handle to remove weeds.
The third improvement is that the top and sides of the front part of the handle are flat. When pressing the blade plate and pushing it left or right by placing the index finger on the top and sides of the front part of the handle and placing the thumb on the front left side of the handle as shown in Figures 8 and 9, it is easier to place the fingertips on them compared to a cylindrical, round handle, making it easier to weed.
The fourth improvement is simply to make the handle thicker and to make the cross-sectional shape elliptical.
By increasing the contact area between the gripping fingers and the palm, the handle is less likely to slip when pushing, pulling, rotating, or swinging from side to side, improving grip strength and making it suitable for long-term work.
It's really easy to use.
In the weeding operation in which the handle is rotated, a thick handle can be rotated with less force, and an elliptical cross-section handle has the advantage of being less likely to slip than a circular cross-section handle.
It is desirable to make the handle about 0 to 130 mm. This is because the size of the hand varies from person to person, so it is impossible to adjust the thickness of the handle to suit the user, but it is desirable to make the handle within the range that can be gripped comfortably.
Preferably a thicker pattern.
(Explanation of terms)

Below, the section up to "Effects of the Invention" will be explained in detail with reference to the basic posture of the weeding tool of the present invention, the positional relationship between the blade and the handle,
The shape that provides the best operability and the terms used are explained in the following order.
(1) Basic posture of the weeder (2) Basic positional relationship between the blade and the handle (3) Shape that provides the best operability (4) Blade body, blade, raised portion, attachment portion (5) Center line of the handle (6) Center line of the handle width (7) Flat blade (8) Flat blade, side edges are flat (9) Deviation, deviation ratio (10) Straight blade (11) Convex bow blade, convex bow shaped blade, obtuse angle blade (12) Concave bow shaped blade, concave bow shaped blade (13) Curved blade (14) Type 1 curved blade (15) Type 2 curved blade (16) Twisted blade (17) Spoon shaped blade, blade shaped like an upside down spoon (18) Blade angle reference line (19) Blade angle (20) Blade angle of a straight blade (21) Angle of the blade of the convex arched blade (22) Angle of the blade of the concave arched blade (23) Inclination angle of the handle (24) Thickness of the handle (25) Handle with a thinner front part, handle with a thinner rear part (26) Shift of the blade plate (27) Front-back, left-right,
(28) Tip of the blade, front end of the blade (29) Rear end of the side edge, rear end of the blade (30) Left edge, right edge, side edge, front edge, front edge (31) Rotation of the handle, swiveling of the handle (32) Flat scraping, smooth scraping (33) Concave scraping, concave scraping (34) Swiveling scraping, gouging weeding method (35) Push scraping (36) Weeding method by cutting into the ground

The basic position of the weed cutter is the basic position of the weed cutter for explanation purposes, and the following two items describe the state of the weed cutter in the basic position.
- The blade and handle are in their basic positional relationship - Rear end of the side edge Details are described in the explanation of the rear end of the side edge The basic posture for each shape of weed cutter is as follows.
1 to 3 are perspective views of a weeder having a flat blade plate and a stepped portion at the rising portion 2 of the blade body, which is a typical shape of the weeder of the present invention. The basic position is shown in FIG. 3, in which the underside of the blade plate is in close contact with a horizontal surface.
Even if the blade plate is not flat, if the side edges are flat, the basic position for each side edge is such that the lower surface of the blade plate is in close contact with a horizontal surface.
In the case of a blade whose side edge is not flat but curved to protrude downward, in FIG.
The angle 135 between the horizontal plane 45 and the center line 36 of the handle is set to 20 degrees, and the rear end 125 of the side edge is set to 20 degrees when the horizontal plane 45
The basic position is the position in which the projection area of the blade plate onto the horizontal plane from the light source directly above the blade plate is maximized when the blade plate is in contact with the horizontal plane.
If the bending shapes of the left and right edges are not the same, the basic position is the position in which the rear end of each side edge is in contact with a horizontal surface in the above-mentioned position.
In the case of a blade plate shape in which the above-mentioned curved blade and a flat blade having a length of 20 mm or more are provided on the same left or right side edge, the basic posture of the blade on the rear side of the side edge is the basic posture of the weed cutter. In other words, for a blade whose rear side edge is flat, the basic posture is the posture in which the underside is in contact with the horizontal surface,
In the case of a blade with a curved side edge as shown in Figure 45, the angle between the horizontal plane and the center line of the handle is 20 degrees.
This is the position in which the rear part of the side edge of the bent portion is in contact with the horizontal plane and the projection area of the blade plate from the light source directly above the blade plate onto the horizontal plane is maximized.
The basic position of a weeder with a spoon-shaped blade is with the blade facing down on a horizontal surface.

Next, the positional relationship between the blade and the handle of the weeder of the present invention will be described. This is the relative positional relationship between the blade and the handle in the basic position of the weeder of the present invention, and is common to the entire present invention.
In FIG. 3, which is a front view of the weeder of Example 1 in the basic position, the front end 24 of the blade plate protrudes forward of the front end 12 of the handle, and the rear end 27 of the side edge is located below the underside 28 of the front end of the handle.
This positional relationship is also the same in the rear view of the basic position.
This is the positional relationship between the blade and the handle in the front view or rear view of the basic position, which is common to all weeders of the present invention, and is called the basic positional relationship between the blade and the handle. This positional relationship is also the same for weeders of shapes other than that shown in Figure 1.
This type of weeder has a blade located just before the handle, and as shown in Figure 5, the height of the front part of the handle is low relative to the ground 50, making it suitable for a weeding method in which the handle is held at a low position close to the ground and the weeder is swung from side to side to scrape the ground with the blade formed on the side edge of the blade plate.
In the drawings of each embodiment, the blade attachment part is attached to the front underside of the handle, but this is not limited to the shape attached to the underside of the handle. In each embodiment, the rising part and the attachment part are plate-shaped, but they may be rod-shaped materials joined to the blade plate by welding or other methods.

For weed removers that remove weeds by gripping the handle as shown in Figure 5 and swinging the weed remover from side to side to cut off weeds, or by scooping up the ground at the base of the weed with the convex arched blade, or by pushing the handle as shown in Figures 14 and 15 to cut the ground with the front edge blade, the shape that provides the best operability can be determined as follows.
When weeding by swinging the weeder from side to side, the blade formed on the side edge of the blade plate is slightly tilted relative to the ground to scrape the ground, so it is desirable that the blade plate be located immediately before the handle, the rising part be low in height, and the handle adjacent to the blade plate be gripped so that the blade plate can be swung from side to side with good pressure. A shape in which the point of force and the point of action are close to each other is desirable, and a shape in which the distance between the grip and the blade plate is far is unsuitable.
Weeders with a high raised portion have the disadvantage that when a load is applied during the operation of cutting off weeds in the left and right direction, the handle rotates and the weeder tends to tilt in the direction of cutting weeds.
The distance between the bottom of the handle and the ground when weeding needs to be high enough that the fingers gripping the handle do not interfere with the ground, but for weeding positions where the handle is parallel or nearly parallel to the ground, the blade plate is operated at a slight angle to the ground, so the height from the bottom of the handle to the blade plate needs to be 35 mm or more to avoid interference with the ground. Since weeding is done with the wrist bent upwards, this is not suitable for long-term work.
The position of the weeder when weeding is preferably such that the angle of the center line of the handle with respect to the ground is within the range of 15 degrees to 30 degrees. If the height of the rising part of the blade is about 15 mm and the shape is designed so that the center line of the handle can be weeded at an angle of 20 degrees to 25 degrees with respect to the ground, interference between the fingers gripping the handle and the ground can be avoided and operation can be performed with almost no bending of the wrist, which is advantageous for long-term work.
In Figure 3, if the height of the rising portion 2 of the blade body is set to about 15 mm and a straight line 29 that passes through the underside of the grip of the handle and is parallel to the center line of the handle, is shaped to intersect with the blade plate, the weeding operation will be easy to operate, and even in the weeding position with the blade plate turned upside down as in Figure 15, the weeding operation can be performed at an angle between the ground and the blade plate and an angle between the ground and the handle that are easy to use.
In FIG. 3 , it is desirable that the blade plate be shaped so as to intersect with any of the straight lines parallel to the center line of the handle, passing through a section within 50 mm below the center line 36 of the handle, with the center line 36 being the upper limit, as shown by straight line 29.
The shape of the handle is preferably that shown in Figs. 1 to 3. A handle with a thinner front portion can avoid interference between the front portion of the handle and the ground even with a blade having a relatively short blade, making it possible to use the weeding method of turning the blade over as shown in Fig. 15 and several similar easy-to-use weeding methods, and a handle with a thinner rear portion can make these weeding methods even easier to use.

The blade body is a general term for the blade plate, the rising portion, and the mounting portion. In FIG. 1, 1 is the blade plate, 2 is the rising portion, 3 is the mounting portion, and 4 is the blade body.
The blade plate refers to the edge that forms the blade, the flat surface that is the same as the edge, and the curved surface of the plate, excluding the rising portion and the attachment portion. A blade plate with a wide shape or a large area can be made lighter by drilling holes. The total length of a blade plate refers to the length from the tip of the blade plate to the rear part of the blade plate, which is the longest length.
The rising portion is an intermediate support between the blade plate and the mounting portion, and is defined as follows when viewed from the front in the basic position:
Or, in rear view, it is the height difference portion from the rear end of the side edge that contacts the horizontal plane to the lower surface of the front end of the handle. In Fig. 3, it is the portion from the rear end of the side edge 27 to the lower surface 28 of the front end of the handle.
In the case of a blade plate having a shape in which a raised portion is provided at an intermediate position between the front end and the rear end, or a shape having a rod-shaped raised portion, a blade cannot be formed on the raised portion. However, the rear portion of the side edge can be bent upward in a bow shape, and a blade can be formed on this bent portion. Therefore, the blade formed on this bent portion is regarded as a blade formed on the raised portion.
For a blade plate having both a curved blade and a flat blade with a length of 20 mm or more on the same side edge, the raised portion is the height difference between the horizontal plane where the rear end of the side edge touches and the underside of the front end of the handle in a front or rear view of the blade behind the edge in the basic position.
FIG. 3 shows a blade shape that is curved from the upper part of the rising portion to the mounting portion, but the inclination angle of the rising portion can be set to about 15 to 30 degrees with respect to the horizontal plane, and the blade shape can be such that there is no bent portion at the upper part of the rising portion and only the lower part of the rising portion is simply bent into a dogleg or bow shape.
For this shape, in a front view or rear view of the basic position, the raised part is the height difference from the horizontal plane where the rear end of the side edge meets to the underside of the front end of the handle attached to the inclined part of the blade, which serves as both the raised part and the attachment part.
The step of the rising part is a shape in which the upper and lower parts of the rising part are bent as shown in Figure 3, and Figure 2
8. This refers to the difference in height from the rear end of the side edge to the underside of the front end of the handle when the weeder is in the basic position, in which a raised portion is provided halfway between the front and rear ends of the blade plate as shown in Figure 29, or in which only the lower part of the raised portion is bent, or in which the weeder has a rod-shaped raised portion.
The blade formed on the rising part belongs to the rising part. If the lower part of the rising part is bent to have a rounded shape as shown in Figure 3 and a blade is formed on this part, this bow-shaped bent blade and
By using the blade at the rear of the side edge in combination, the weeding operation can be performed by scooping up the weeds together with the ground. In Fig. 2, if the blade 16 at this portion is shaped so as to protrude to the right side of the handle with respect to the right side of the handle, this weeding operation becomes easier.
In Figure 3, the height difference between the horizontal plane 45 and the underside 28 of the front end of the handle is the rising part, and this height difference and the inclined handle keep the fingers gripping the handle away from the ground as shown in Figure 5, avoiding interference with the ground and allowing the handle to be held at a low position close to the ground.
In order to secure a sufficient distance between the fingers gripping the handle and the ground and to hold the handle at a low position close to the ground to remove weeds, it is desirable for the height of the rising part to be about 15 mm. In the weeder of the shape shown in Figure 1, if the difference in height of the rising part becomes large, the front part of the handle will interfere with the ground in the weeding method shown in Figure 15.
This easy-to-use weed control method becomes impossible.

The center line of the handle refers to a straight line connecting the centers of the thickness of the cross section at both ends of a central 50 mm section of the length of the handle, and its extension. In Figure 3, 36 is the center line of the handle.
For handles with a total length exceeding 170 mm, the above straight line and its extension shall be the center line of the handle in a central 50 mm section of the 170 mm length from the tip.

The handle width center line is a straight line that serves as the reference for drawing the blade angle reference line.
With the upper surface of the blade plate facing upward and the handle horizontal, both ends of a 50 mm section in the middle of the handle length are marked on the upper surface of the handle, and when viewed from a light source directly above the blade plate in a plan view in which the area of the blade plate projected onto the horizontal plane is maximized, the handle width center line is a straight line connecting the centers of the handle width at both ends of the 50 mm section, and an extension of this line. In Figure 2, reference numeral 18 denotes the handle width center line.
For handles with a total length exceeding 170 mm, the above straight line and its extension shall be the handle width center line in a central 50 mm section of the 170 mm length from the tip.

A flat blade is a blade formed on the flat edge or an edge close to the flat edge of a blade plate, having a length of 20 mm or more and a deviation rate due to bending of the blade of less than 5%, and here refers to any of a straight blade, a convex arched blade, a concave arched blade, and an obtuse-angled blade.
Flat blades also include blades with edges that are curved downward relative to the flat surface and where the deviation due to the bend is less than 5%. Flat blades also include blades with slightly upwardly curved side edges and where the deviation due to the bend is less than 2%.

A flat plate means a blade plate whose entirety, or whose left or right edge is flat or nearly flat. Here, it is used to mean a plate whose side edges are curved so that they gently protrude downward, including a flat plate, and whose deviation due to the bending of the blade is less than 5%. A blade that is slightly curved upward and whose deviation due to the bending of the blade is less than 2% is also considered to be a flat plate. A blade plate having the above shape and having holes drilled therein to reduce weight is also considered to be a flat plate.
When referring to the entire blade plate, a flat blade plate is one that is flat or close to the above-mentioned flat plane. When referring to only the side edges, a flat blade plate is one in which a portion of the plate 10 mm wide from each end of the left and right edges, including the portion where no blade is formed, is flat for 70% or more of the total length of the side edge when viewed in a plan view from a light source directly above the blade plate in an attitude in which the projected area of the blade plate onto the horizontal plane is maximum.
This means that if 70% or more of the length of the left or right edge in plan view is flat,
This is because it is possible to form a blade with substantially the same functionality as a blade plate whose entire edge is flat.

The deviation will be explained with reference to Fig. 43 to Fig. 45. Fig. 43 is a plan view of a weeder equipped with a convex-bow shaped blade 100 on the left edge of the blade plate, and Fig. 44 is a plan view of a weeder equipped with a concave-bow shaped blade 110 on the left edge of the blade plate. Although the shapes and sizes of the blade plates are different, the front views of each are similar to those of Fig. 3.
The distance 103 between the furthest point of the blade tip and the straight lines 101, 111 connecting both ends of the convex bow blade and the concave bow blade is the deviation of the convex bow blade, and 113 is the deviation of the concave bow blade, both expressed in millimeters.
The deviation ratio is the ratio of the deviation 103 to the length 102 of the straight line connecting both ends of the blade.
Similarly, the ratio of the deviation 113 to the length 112 of the straight line is expressed as a percentage as the deviation ratio, which is about 26% in Fig. 43 and about 6% in Fig. 44.
When viewed from a light source directly above the blade plate, the blade plate is in a position where its projected area onto the horizontal plane is maximized.
The deviation and deviation ratio of a blade whose edge of a flat blade plate protrudes at an obtuse angle of 120 degrees or more, or is recessed at an obtuse angle of 120 degrees or more, are expressed in the same manner as the above-mentioned convex bow-shaped blade and concave bow-shaped blade.
The deviation due to the bend of the blade relative to the plane and the ratio of deviation due to the bend of the blade are similarly expressed as follows:
Figure 45 is a front view of the basic posture of a weeder with a blade whose side edge is curved to protrude downward, in which the angle 135 between the horizontal plane 45 and the center line 36 of the handle is 20 degrees, and the rear end 125 of the side edge is in contact with the horizontal plane 45, and this is the posture in which the projection area of the blade plate from the light source directly above the blade plate onto the horizontal plane is maximized. However, in this figure, the side edge blade is formed on the edge on the upper surface side of the blade plate.
In FIG. 45, a straight line 127 connects a rear end 125 of the side edge to a front end 126 of the blade of the side edge.
The distance 129 between this straight line and the part of the blade that is farthest from it is the deviation due to the bending of the blade, and the ratio of the deviation 129 due to the bending of the blade to the length 128 of this straight line is the ratio of the deviation due to the bending of the blade. In this figure, the ratio of the deviation due to the bending of the blade is about 10%.
The deviation ratio due to bending of a blade in which the portion forward of the rear end of the side edge is not curved in an arch shape but is curved in a shape that protrudes downward at an obtuse angle of 120 degrees or more is also expressed in a similar manner.
For blade plates with a shape in which the front portion of the side edge is bent back, the bent back portion shall be excluded from the judgment.

A straight blade is a blade having a straight edge and a length of 20 mm or more when viewed from a light source directly above the blade plate in a plan view in which the projected area of the blade plate onto a horizontal plane is maximum, as well as a convex-bow blade with a deviation ratio of less than 5%, and a concave-bow blade. Blades having obtuse-angled protruding edges and obtuse-angled recessed edges with a deviation ratio of less than 5%, each of which has an edge length of 10 mm or more, are also considered to be straight blades.
However, when the blade length is less than 20 mm, the term "straight blade" is used.
For each blade, the deviation due to blade bending is less than 5%.
It is also possible to form two straight blades in succession at a certain angle on the same edge, and in this shape, each straight blade can be used alone, or the apex where the two blades intersect can be used to scoop up the ground at the base of weeds or to dig up the weeds by inserting the blade into the base.
The blade 6 on the left edge of FIG. 1 is an embodiment of a straight blade, which is suitable for use in cutting multiple weeds simultaneously using the entire blade width.
The blade is a straight blade formed on the front edge of the blade plate, with the blade angle relative to a blade angle reference line being 120 degrees or more and 180 degrees or less, and a blade with a narrow width from left to right can be used to cut off weeds one by one by pushing and to dig up weeds by inserting the blade into the base of the weed, while a blade with a wide width from left to right can be used to cut off multiple weeds at the same time by pushing.
In the case of a blade having a plurality of blade shapes on the same side edge, such as the right edge in Fig. 43, each blade is treated as a straight blade and a convex arcuate blade in this figure. The obtuse angled protruding portion 105 is treated as an obtuse angled blade.

A convex arched blade is a blade having a blade length of 20 mm or more, an edge of the blade plate that is formed in an arch shape having a diameter of 10 mm or more on the edge of the plate that protrudes outward, a deviation ratio of 5% or more, and a deviation ratio due to bending of the blade of less than 5%. The blade 7 on the right edge of Figure 1 is an example of a convex arched blade.
A blade of this shape is suitable for scooping up the ground at the base of weeds in a concave shape, and for scraping off the ground at the base of weeds by rotating the blade, and can be used for the multiple purposes described in the description of the weed remover in Example 1.
A blade that satisfies the above conditions also includes a circular or elliptical blade plate, a blade plate whose edge is shaped like a part of a circular or elliptical plate, and a blade formed by connecting straight or nearly straight blades to form a broken line-like quasi-convex arch blade.
A convex bow-shaped blade is a blade formed on the edge of a plate that protrudes outward in an arch shape.
The above does not fall under the category of convex bow-shaped blades, the deviation ratio is less than 5%, and the deviation ratio due to blade bending is 5%.
A general term for blades with a length of 20 mm or more, including those less than 20 mm.
A plurality of convex arch-shaped blades having different arc sizes may be provided on the same side edge.
The convex bow-shaped blade located at the front edge of the blade plate can be used to cut the ground into a concave or concave shape by pushing and cutting.
The convex-arch shaped blade disposed on the front edge of the blade plate may be in the shape of a fan-shaped blade plate if the blade plate has a shape in which the front part is wider than the base part of the blade plate.
Compared with a convex-bow-shaped blade formed on the side edge, it is easier to press the blade and rotate the handle left and right multiple times, and it is possible to perform weeding operations by penetrating the blade over a wide width.
The obtuse-angled blade is a blade formed on an edge that protrudes at an obtuse angle, and falls within the range of an obtuse angle, and each edge that constitutes the obtuse-angled blade has a length of 10 mm or more. The obtuse-angled blade formed on the side edge is
The blade can be used to scoop up weeds along with the ground, just like the convex bow blade. In addition, the blade can be used to press the blunt blade against the ground and cut it into pieces. The angle of the blunt blade on the front edge is 12
For angles of 0 degrees or more, the front and back of the blade plate can be used separately, allowing for push-cutting with each straight blade.
If the two blades that make up an obtuse-angled blade meet the above conditions for a straight blade or a convex arcuate blade, each blade is treated as an independent straight blade or convex arcuate blade. The edge of an obtuse-angled blade that is composed of two blades including a straight blade is also an edge that has a straight blade.
An obtuse-angled blade is one in which the apex of the obtuse-angled portion is rounded to less than a circular arc with a diameter of 10 mm, and the blade length is 20 mm or more.
The obtuse-angled protruding portion 1 of the front part of the blade plate in FIG. 24, the front part of the blade plate in FIG. 43, and the right edge blade
No. 05 is an example of an obtuse-angled blade.

A concave bow-shaped blade is a blade formed on an edge that is bowed inward from a straight line 111 connecting both ends of the blade, such as the blade 110 on the left edge in Fig. 44. The deviation ratio due to the bending of the blade is less than 5%. When limiting to a deviation ratio of 5% or more, the term concave bow-shaped blade is used.
When the concave-bow shaped blade formed on the left edge is used to scrape the ground with the blade plate in contact with the ground and the weeder swung to the left, the concave-bow shaped blade rotates in a convex-bow shape, moving as if stroking the ground and scraping it, making it easier to scrape than a straight blade and making it possible to scrape a very thin layer of ground, making it suitable for scraping off small weeds that are densely grown and have shallow roots.
However, when the blade plate is inclined with respect to the ground, the central blade floats off the ground, so unless the deviation ratio is small, it is not suitable for cutting the ground somewhat deeply.

The bent blade is a blade in which the side edge of the blade plate is bent so as to protrude downward as shown in FIG. 45. In FIG. 45, the angle 135 between the horizontal plane 45 and the center line 36 of the handle is set to 20 degrees, and the side edge rear end 12
A blade with a deviation due to bending of 5% or more in the basic position where the projected area of the blade plate onto the horizontal plane from a light source directly above the blade plate is maximum with the blade plate in contact with a horizontal plane. A blade with a deviation due to bending of less than 5% and a length of 20 mm or more is treated as a flat blade.
For blades with the front of the side edge bent back, the bent back part is excluded when determining whether or not it is a bent blade. A blade that is bent from the rear end of the side edge to the front end of the side edge at an obtuse angle protruding downward, with a deviation ratio due to the bend of the blade of 5% or more, and with each edge of the obtuse angle part being 10 mm or longer, is treated as a bent blade.
30 to 32 show an embodiment of a weeder having a type 1 bending blade on the left edge and a type 2 bending blade on the right edge.

A type 1 bent blade is a blade in which the side edge of the concave bow-shaped blade of a flat blade plate is bent into a shape that protrudes in a bow shape downward as shown in Figure 31, and which satisfies the above-mentioned conditions for a bent blade, and the blade 77 on the left edge of the weed cutter shown in Figures 30 to 32 is an example of a type 1 bent blade. A blade in which a similar concave bow-shaped edge is formed by connecting multiple straight blades and is bent into a shape that protrudes in a bow shape downward, and which satisfies the above-mentioned conditions for a bent blade, also belongs to the type 1 bent blade.
In the weeding position shown in FIG. 32, the first type bent blade has the entire side edge in contact with the ground at a substantially constant angle, so the blade plate is less likely to wobble relative to the ground compared to a straight blade formed on a straight edge.
This has the advantage of making it easier to maintain a constant angle.
In Figure 32, the blade is inclined to the ground. When the weeder is swung in the direction of the arrow,
With the entire tip of the blade in a concave arc in contact with the ground, the blade is moderately inclined toward the ground and moves in an arc as it rotates, stroking the ground, which has the advantage of making it easier to cut than a straight blade. It is suitable for cutting down multiple weeds at the same time.

A type 2 bent blade is a blade having a straight edge on a flat blade plate, an edge that protrudes outward in a convex bow shape, or
The side edge protruding outward at an obtuse angle and in a trapezoidal shape is bent into a shape that protrudes towards the underside of the blade plate as shown in Figure 31, thereby satisfying the conditions of the bent blade described above. Example 7, Figures 30 to 32, shows a weeding tool equipped with a type 2 bent blade 78 on the right edge.
Compared to a flat convex-arch shaped blade, the Type 2 curved blade makes it easier to scoop up weeds along with the ground.
The type 2 bent blade can be placed next to the flat blade on the same side edge by bending only a part of the side edge of the flat blade into a shape that protrudes downward. This shape has the advantage that two types of blades can be used in the same weeding direction.
The blade plate has a rounded spoon-like edge with a blade formed on it, and the blade plate has the same shape but no bottom.
This type of bent blade is included in the Type 2. The operation of scooping the ground with the blade formed on the edge of the spoon-shaped blade plate and the weeding operation of scraping the ground are similar to the weeding performed by the blade 78 on the right edge of Figures 30 to 32.

The blades 80 and 83 on the left edge of Fig. 37 are examples of twisted blades. A twisted blade is a blade that is twisted on the side edge to rotate different sections of the blade on the same side of the left or right edge without changing the angle between the ground and the handle.
It can be selected and used simply by rotating the handle.
A blade with a twisted side edge necessarily has a curved shape, and therefore has multiple blade shapes on the same side edge. A blade with a side edge bent diagonally in an intersecting direction also belongs to the category of twisted blades.
The twisted blade has an advantage that the angle between the ground and the handle is constant, and multiple blades on the edge of the same side can be selected and used by rotating the handle while keeping the handle at an appropriate angle that is easy to use, and weeds can be removed with blades of multiple shapes in the same easy-to-use weeding direction.
Fig. 36 is a plan view of the weeder of Example 8 with the handle held horizontally, and Fig. 37 is a front view of the same. Fig. 38 shows the handle being gripped with the angle between the horizontal plane and the center line of the handle set at 25 degrees.
From the position shown in Figure 38, the handle is rotated slightly to the left and the curved blade 83 is used to scoop up the ground at the base of the weed. When the handle is rotated further to the left to the position shown in Figure 39, the curved blade 83 leaves the ground, the entire straight blade 80 comes into contact with the ground, the blade is inclined in the weed-cutting direction, and the blade plate is at a moderate angle of inclination to the ground, so that the weed cutter can be swung to the left to scrape off a flat surface.

A weeder with a spoon-shaped blade is a blade with a blade similar in shape to a rounded spoon, with a blade formed on the edge, attached to the front of the handle. The operation of scraping the ground is done by scooping the ground from side to side with the spoon, and the function is the same even if the spoon does not have a bottom part.
The spoon-shaped blade can be used not only to scoop up the ground but also to remove weeds by turning the blade upside down.
It can be used to cut up the ground, push and scrape with the front blade, and weed on relatively hard ground. It can be considered a Type 2 bent blade with a convex bow shaped blade formed on the left and right edges of the flat blade plate bent downward, and is classified as a Type 2 bent blade based on the blade shape.
Example 9, Figures 40 to 42, show a weeder equipped with a blade plate shaped like an upside-down spoon, which is functionally different from a weeder equipped with a spoon-shaped blade plate. Even though it does not have a part equivalent to the bottom of the spoon, it is functionally the same.
This weeder has a similar shape to a small shovel that can be operated with one hand, but as shown in the front view (Figure 41), it has a step between the blade and the handle, which is different from a shovel.
The handle can be easily gripped by ensuring a certain distance between it and the ground, and weeds can be removed by swinging it from side to side while the blade plate is pressed down.
In the position shown in Figure 41, when the blades on both the left and right edges are inclined appropriately relative to the ground and are in contact with the ground at the same time and swung from side to side, two weeding operations can be performed in one stroke, and it can also be used for a variety of other purposes.
The type 1 bent blade 77 in Figure 30 has a shape in which the concave-arc shaped side edges of a flat plate are bent so as to protrude downward as shown in Figure 31, whereas the weed cutter in Figures 40 and 41 has a feature in that it has edges on the left and right sides of the blade plate that are similar in shape to a flat plate with convex-arc shaped side edges bent so as to protrude upward.
If the side edges of the blade plate are made angular, the blades on the side edges will be straight or close to straight, so that when the blade plate is laid down in a weeding position, the straight blades with the left and right edges inclined toward the ground can be used to make flat cuts in both directions, and the front edge blade can be used for push cuts.
The right, left and leading edges may be shaped differently.
As blade shapes similar to those of the weeding tools of Figs. 40 to 42, there are fan-shaped, trapezoidal, inverted trapezoidal,
In the case of square, flat blade plates with a shape in which the center is higher than the left and right edges and protrudes upward, that is, blade plates bent into the shape of a part of a cone or cylinder with a cut-away shape, or blade plates shaped like a roof, the left and right edges are inclined and simultaneously contact the horizontal surface, so that by swinging the blade left and right, two weeding operations can be performed in one round trip, and the blade formed at the front of the blade plate can be used to cut into the ground in a concave shape or shallow valley shape by turning the blade over and pushing the handle.
Similar to the roof-shaped blade, the bent cross section is U-shaped, and the left and right edges of the blade can be used with different angles to the ground. The bent cross section can also be trapezoidal. These blade shapes also belong to the upside-down spoon blade shape.

The blade angle reference line is a straight line perpendicular to the handle width center line, and serves as a reference for expressing the angle of a blade whose side edge is a flat blade. In Figure 2, a straight line 19 perpendicular to the handle width center line 18 is the blade angle reference line.

The blade angle is the angle between the straight blade formed on the blade plate and the convex bow-shaped blade with a deviation ratio of less than 10%.
Similarly, for a concave bow-shaped blade, the angle between the blade and the angle reference line 19 is expressed in the range of 0 degrees to less than 180 degrees when viewed from above in the basic position. The straight blade formed on the front edge may also be a 180-degree blade.
When weeds are removed by scraping the ground with a straight blade formed on the side edge, a blade inclined with respect to the weeding direction 55 in FIG. 7 has the advantages described in the "Means for solving the Problems" section.
As a measure of the degree of inclination of a blade having this advantage, the blade angle is expressed as follows for a straight blade, a convex bow-shaped blade with a deviation ratio close to that of a straight blade of less than 10%, and a concave bow-shaped blade.

The blade angle of a straight blade represents the degree of inclination of the straight blade relative to a blade angle reference line.
To express the blade angle of a straight blade, the blade must be straight when viewed in a plane. For blades that fall under the category of straight blades but are not straight, the straight line connecting both ends of the straight blade when viewed in a plane in the basic position is regarded as the blade, and the angle between this line and the blade angle reference line is expressed.
In FIG. 2, a blade angle reference line 19 perpendicular to the handle width center line 18 is drawn, and the angle 20 between this blade angle reference line and the straight blade 6 is the blade angle of the straight blade.
The blade angle is expressed in the range from 0 degrees to less than 180 degrees, with the blade angle reference line being 0 degrees, and the angle value increasing clockwise for a straight blade on the left edge and counterclockwise for a straight blade on the right edge. However, the straight blade formed on the leading edge may also be a 180 degree blade.
In the case where a straight blade and a blade of another shape are mixed on the same side edge of the blade plate, the blade angle of the straight blade is defined as the angle between a straight line connecting both ends of the longest section corresponding to the straight blade and the blade angle reference line in a plan view of the basic position.

The blade angle of a convex arcuate blade represents the average inclination of the convex arcuate blade relative to the blade angle reference line for blades with a deviation ratio of the convex arcuate blade of less than 10%.
In a plan view of the basic posture, both ends of the convex bow-shaped blade having a deviation ratio of less than 10% are connected by a straight line;
The angle between this straight line and the blade angle reference line is the blade angle of the convex arcuate blade, and is expressed in the same manner as the blade angle of a straight blade.
Convex arcuate blades are versatile blades with a range of blade angles suited to each individual application.
For blades with a deviation ratio of 10% or more over the entire area of the convex arched blade, the section is divided and the partial blade angles suitable for each application are expressed as follows:
Any section of the convex arched blade is connected with a straight line 10 mm long, and the section is divided into sections where the deviation ratio of the section is less than 10%, and the angle between the straight line and the blade angle reference line 19 is represented for each divided section.
When expressing a partial angle of this 10 mm section, the expression "section angle" is used. The blade of each section has different suitability depending on the angle, which will be explained below.
As an example, for the edge of the semicircular convex arched blade on the left half of a weed cutter equipped with a circular, flat blade plate with a diameter of 70 mm, if any section is divided by connecting any of the sections with a straight line 10 mm long as described above and the section angle between this line and the blade angle reference line is expressed, the approximate range of section angles suitable for each application will be as follows:
The blades with an angle of 40 degrees to 150 degrees are used for flat and concave shaving, the blades with an angle of 60 degrees or more are used for turning and stroking, the blades with an angle of 90 degrees to 150 degrees are used for weeding by cutting the ground, and the blades with an angle of 130 degrees are used for weeding by cutting the ground.
Blades with an angle of 70 degrees or more are suitable for push-cutting. Blades with an angle of 70 degrees or less can be used to cut the ground diagonally backward. A convex-arc blade with a wide range of section angles like this example can be used for a variety of weeding methods. It is also possible to form a convex-arc shaped blade with partially different arc sizes within the same side edge.

The blade angle of a concave arcuate blade represents the average inclination of the concave arcuate blade relative to the blade angle reference line when viewed in a plane in the basic position, similar to a straight blade, for a blade with a deviation ratio of less than 10%.
A straight line is connected to both ends of the concave arcuate blade where the deviation ratio is less than 10%, and the angle between this line and the blade angle reference line is defined as the blade angle of the concave arcuate blade.

The inclination angle of the handle refers to the degree of inclination of the center line of the handle with respect to the horizontal plane to which the underside of the side edge is in contact when viewed from the front or back in the basic position of a weed cutter that has a stepped portion at the raised part and has flat side edges of the blade plate.
In FIG. 3, the angle 40 between the horizontal plane 45 with which the lower surface of the blade plate is in contact and the center line 36 of the handle is the inclination angle of the handle.
When viewed from the front or back with the underside of the side edge in contact with the horizontal plane, the horizontal plane and the center line of the handle are parallel, which is 0 degrees. If the rear end of the handle center line is lower than the front end of the handle,
The angle is expressed by adding a minus sign (-) to the numerical angle.
For knives with a step at the rising edge and a handle inclination angle of around 0 degrees, if the height of the rising edge is low, the fingers gripping the handle will interfere with the ground, so this height must be 35 mm or more. As the distance between the bottom of the handle and the ground becomes wider, for straight blades with a blade angle of around 90 degrees,
When swinging the handle back and forth to scrape the ground, the moment the blade is loaded, the weeder tends to tilt in the direction of the weed. When the handle is tilted at an angle of nearly 0 degrees, the handle must be held horizontal or nearly horizontal when scraping the ground, so the wrist and hands must be bent upwards, making it unsuitable for long-term work.
In FIG. 3, the inclination angle 40 of the handle is 25 degrees, and even if the height of the rising portion is low, the handle can be gripped near the front without interference between the ground and the fingers as shown in FIG. 5, and the handle can be held at a low position.
To enable weeding by swinging the weeder from side to side with almost no bending of the wrist, and to enable weeding at a moderate handle angle even in a weeding posture with the blade plate turned upside down, and a handle angle of about 20 degrees to 25 degrees is easy to use.
Figure 3 shows a flat blade plate, but by inclining the handle so that a straight line 29 that passes through the underside of the gripping part of the handle and is parallel to the center line of the handle intersects with the blade plate, even in a weeder equipped with a blade with curved side edges, the handle can be operated at a moderate angle to the ground, and weeding can be performed with the handle at a moderate angle to the ground even when the weeding tool is in a weeding position with the blade plate turned upside down.

The thickness of the handle is defined as the thickness of a central 50 mm section of the handle length when viewed from the front with the blade plate facing upward and the blade plate in a position where the projection area of the blade plate from a light source directly above the blade plate onto the horizontal plane is maximized.
The maximum thickness from the bottom surface of the handle to the top surface of the handle. In Figure 3, 37 is the thickness of the handle.
For handles longer than 170 mm, the above procedure shall be followed for a 50 mm section in the center of the 170 mm length from the tip.

A handle with a thin front part is one in which the front upper or lower surface of the handle is cut away over a section of 15 mm or more from the front end of the handle in FIG. 3, so that the thickness of the front end is 80% of the handle thickness (37).
The term "15 mm or more" refers to a handle that is a cut-out portion of the front of the handle. However, this section of 15 mm or more is the distance from the front end of the handle on a straight line parallel to the center line of the handle. In Figure 3, 32 is the cut-out portion of the front of the handle.
FIG. 3 shows a shape in which the front upper surface of the handle has been removed, but even if the front lower surface has been removed, it is possible to make the blade functionally equivalent by changing the inclination angle of the attachment portion 3 of the blade body, since the angle between the blade plate and the center line of the handle can be made the same.
With a handle of this shape, even if the blade length is comparatively short, it is possible to prevent interference between the front part of the handle and the ground in the weeding method shown in Figure 15, in which the blade is turned over and the handle is pushed forward and downward to remove weeds, and it becomes possible to carry out several easy-to-use weeding methods in which weeds are removed in similar positions.
In the weeding posture of Figure 6, even when the front part of the handle is gripped, the recess between the thumb and index finger does not come into contact with the cut part. Therefore, although the perimeter of the front part of the handle is shortened by the cutting, the contact area between the fingers and the palm gripping the handle is not reduced.
A handle with a thin rear part is one in which the rear part of the handle is cut off so that the rear part is thinner than the handle over a section of 15 mm or more from the rear end.
This refers to a pattern that is 80% or less of the original size.
In Figure 3, 33 is the cut-out part on the bottom of the rear part of the handle. In the weeding method shown in Figure 15, where the blade is turned over and the handle is pushed to remove weeds, the handle is gripped with the palm of the hand and pushed forward and downward to remove weeds, and the shape of the handle fits the hand well and is easy to grip and push, without the uncomfortable feeling of the rear corners hitting the palm of the hand. This shape makes the weeding method shown in Figure 15 and similar positions where the handle is pushed to remove weeds very easy to use.

The shifting of the blade plate will be described with reference to FIG.
As the blade angle 20 of the straight blade approaches 0 degrees from 90 degrees, the blade plate protrudes significantly to the side of the handle. The straight blade angle 20 of the weed cutter in Figure 22 is 45 degrees, and if there is no shift in the blade plate, the blade will protrude to the left side of the handle as shown by the two-dot chain line, resulting in poor left-right balance.
To remove weeds by scraping the ground with the straight blade on the left edge, unlike cutting weeds with a sickle,
Whether the weeding direction is to the left, rear left, or rear, it is necessary to press the blade tip firmly against the ground over the entire width of the blade.
However, in the blade shown by the two-dot chain line, the straight edge of the left edge protrudes entirely to the left of the handle,
As you get closer to the tip of the blade, the distance from the handle width center line 18 increases, and the force point increases.
The force pressing the blade into the ground becomes weaker.
In order to press the blade firmly into the ground, all the way to the tip of the left edge, it is necessary to press the handle downward while simultaneously applying force to rotate it to the left, which causes a lot of fatigue in the arm and makes it difficult to operate.
In Figure 22, the portion of the blade plate indicated by the two-dot chain line is shifted to the right to correct the left-right balance of the blade plate with respect to the handle width center line 18. By reducing the amount by which the straight blade protrudes to the side of the handle, it is easier to press the entire straight blade against the ground and the left-right balance of the blade plate is corrected.
Shifting the blade to the right or left in relation to the center line of the handle width to correct the left-right balance of the blade is called blade shifting.
The shift amount of the blade plate will be described. In FIG. 22, as a result of shifting the blade plate to the right in order to correct the left-right balance, the center 61 of the left-right width 60 of the blade plate at the lower part of the rising portion and the center line 18 of the handle width are
This deviation distance 62 is the amount of shift of the blade plate and is expressed in millimeters.
Unless the blade plate has a shape that is well balanced between the left and right, it is desirable to improve operability by correcting the balance by shifting the blade plate.

The front and rear of the weed cutter refer to the front and rear when the front end of the handle is the front and the rear end is the rear. The left and right of the weed cutter refer to the left and right when viewed from above when the top surface of the blade faces upward and the front end of the handle faces forward.
It means right.

The tip of the blade is a point of intersection 22 between a line 21 perpendicular to a handle width center line 18 drawn at the front end of the handle in FIG. 2, which is a plan view of the basic posture of the weeder of Example 1, which is a representative shape.
The end of the blade that protrudes most forward or diagonally forward from the handle, 23, is the tip of the blade.
The front end of the blade plate is the end of the blade plate that protrudes most forward with respect to the straight line 21 in FIG.
is the front end of the blade plate. The front end of the blade plate and the tip of the blade plate are not necessarily the same.
For blade plates with other shapes, the tip end and the front end of the blade plate shall be similar to the above when viewed in a plan view in the basic posture.
In the case of a blade plate shape in which a straight blade with a blade angle of 180 degrees is located at the front end, the entire straight blade is the front end, and in the case where both ends of the straight blade are equidistant from the above intersection point 22, the intersection point 2 with the side edge is the front end.
The tip of the blade plate is at this point. If the leading edge is concave, there may be two tips.

The rear end of the side edge is the rearmost part of the side edge that contacts the horizontal plane when viewed from the front or rear in the basic position, and there is a rear end on each of the left and right side edges. In Fig. 3, the rear end is 27, and in Fig. 45, it is 125. In the case of the shape in Fig. 28, the rear ends of the left and right side edges are the same.
The rear end of the blade plate refers to the rearmost end of either the left or right side edge of the blade plate.

The left edge, right edge, side edge, front edge and front edge are as follows.
When viewed from above with the front end of the handle facing forward and the top surface of the blade plate facing upward, from a light source directly above the blade plate, in a position where the projected area of the blade plate onto a horizontal plane is at its maximum, the edge on the left side of the blade plate to the front end of the blade plate is called the left edge.
The edge on the right side of the blade plate up to the front end is called the right edge. The left and right edges are called the side edges.
The front edge refers to an edge that is located in front of half of the length of the blade plate in the front-rear direction in the plan view.
This refers to the edge that faces forward or diagonally forward.
The leading edge is the edge at the forefront of the blade plate that faces forward or diagonally forward, and refers to any of the following blade shapes: a convex bow-shaped blade, a straight blade, a concave bow-shaped blade, or a blade shaped similar to two sides of a triangle formed by two straight blades.
For those whose leading edge is shaped like a convex bow or a shape similar to the two sides of a protruding triangle, the left and right edges of the front end of the leading edge part are part of the left edge or right edge, but the blade of the leading edge is mainly used for weeding by pushing the handle, and the blade of the side edge behind the leading edge is mainly used for weeding by swinging the handle from side to side, so when both the leading edge and side edge are listed, the side edge refers to the section excluding the leading edge part.

Rotating the handle is the operation of turning the handle around the center line of the handle, and is mainly the operation of weeding by twisting the handle to the left or right.
Or it refers to the operation of rotating the handle counterclockwise.

Plane cutting is a process where the blade on the side edge is used to cut left and right, diagonally forward, diagonally backward, and backward, other than push cutting.
This refers to the weeding operation of scraping off a thin layer of the ground. This includes the sweeping technique of scraping the ground by swinging the weeding tool back and forth.
The stroking method involves weeding the ground by sliding the blade over it, as if stroking the ground.
Compared to cutting perpendicular to the blade, the cutting width is narrower but it is easier to cut and is also suitable for weeding wet ground. The operation of cutting the ground by swinging a convex bow shaped blade, concave bow shaped blade, type 1 bent blade, or upside down spoon shaped blade back and forth is similar to the operation of cutting by sliding a knife, because the bow shaped blade cuts while moving in a bow-like manner, and just as a curved sword cuts better than a straight sword, it has the advantage of being easier to cut than a straight blade.
The operation of scraping the ground in the Y direction in Figure 10 involves a linear blade that is significantly inclined relative to the weeding direction, scraping the ground in a stroking motion, so although the scraping width is narrow, it is an excellent technique that makes scraping very easy.
In FIG. 18, the angle of the blade to the ground is set at 60°.
It is also possible to scrape off weeds by pushing the handle in direction b, slightly diagonally forward from the tip of the blade, at a distance of about 150 degrees. This method is also suitable for removing weeds on dry, hard ground, and although the scraping width is narrow, it is a very easy weed removal method.
Just as it is easier to cut soft materials with a knife by sliding the blade across the surface, a long blade is advantageous for scraping and is also suitable for weeding wet ground.
The arched edge of the blade can form a longer blade than a straight edge, and when you scrape the ground by swinging your elbow or wrist from side to side, the blade moves in an arch shape, making it suitable for sweeping. Swinging only your wrist to remove weeds allows for a shorter repetitive cycle than swinging your elbow to remove weeds, making it suitable for removing densely grown small weeds.

Concave cutting refers to cutting with a convex bow-shaped blade or a blade curved to protrude downward, as shown in Figure 13.
Place the brush next to the weed as shown in the image, and scoop up the ground at the base of the weed until it is 1mm deep.
This is a weed removal method in which the weed is removed in a concave shape of about 5 mm.
Since it can instantly remove small pieces of ground around weeds, it is suitable for removing scattered weeds one by one, and it can reduce the amount of ground that is removed beyond the required width.
Relatively fast iterative operations up to three times are possible.
Concave scraping refers to the operation of scraping the ground with the blade into a shallow bow-shaped or shallow V-shaped groove.
If you use a scooping motion, it will create a concave cut, and if you cut continuously, it will create a concave cut.
The convex-bow shaped blade formed on the front edge of the blade plate can also be cut into a concave or concave shape by pressing the handle.

Swivel cutting is a weeding method in which a convex-bow shaped blade or a blade curved to protrude downwards is pressed against the side or front of the weed as shown in Figure 13, and the handle is turned counterclockwise to cut it off. The blade moves while turning around the weed, making it easy to cut and suitable for removing weeds with established roots. When using a weed cutter with a blade shaped as described above on the left edge, the direction of the handle turning is clockwise.
A fan-shaped blade plate, in which a convex-bow-shaped blade is arranged on the front edge of the blade plate, makes it easy to press the blade and rotate the handle left and right multiple times, allowing the blade to penetrate widely.
The gouging method of weeding involves inserting the blade into the ground to a certain depth and rotating or swiveling the handle to cut the roots, which is slightly different from swiveling scraping. When performing this operation with a weeder that has a straight blade on one side and a convex-blade on the other, it is easier to scrape by rotating or swiveling the handle toward the convex-blade.
Both the rotary scraping and gouging methods of weed control are effective in removing established weeds.

Push-shave is a weeding method in which the handle is pushed forward or downward and the front edge of the blade scrapes off the weeds along with the ground, and both sides of the blade can be used to remove weeds, as shown in Figures 14 and 15. The direction in which the blade is pressed and the direction in which it is scraped off are the same, so weeds can be removed by simply pushing the handle in a straight line, making this a very easy-to-use weeding method with good operability, and it is possible to weed 2 to 3 times per second.
The push weeding method shown in Figure 15, in which the blade plate is turned over to scrape the ground, is characterized by the fact that the blade plate is at a moderate angle to the ground by making the center line 36 of the handle inclined with respect to the blade plate, and by pushing the handle in a straight line, the blade is pressed against the ground and moves at the same time, and since the direction in which the handle is pushed and the direction in which the front edge of the blade faces are balanced, the ground can be scraped to an almost constant depth for weeding, making it a very easy-to-use and excellent weeding method. In the weeding tool shown in Figure 17, in which the center lines of the blade plate and the handle are parallel, the direction in which the handle is pushed and the direction of the cutting edge are the same, so the blade tends to go straight deep into the ground and is not suitable for scraping the ground.
By adopting a handle with a thinner rear section, when pushing weeds with the blade upside down,
Gripping the rear part of the handle rather than gripping the periphery of the handle prevents slipping and the rear part of the handle fits snugly against the palm of the hand, making it easier to press and making this weeding method easier to use.
In plan view, if you push the handle with a blade that is inclined toward the direction of the handle, the weeding will be done in the same way as with smooth weeding.
This has the advantage of being easier to cut than a blade that is perpendicular to the weeding direction.

The weeding method of breaking up the ground involves placing the convex bow-shaped blade against the side of a weed, with the blade plate inclined at a steep angle to the ground, and pushing the handle in the direction a diagonally downward from the tip of the blade plate, cutting into the ground and breaking up the ground to remove the weed, as shown in Figure 18. It is easier to break up the ground by twisting the handle left and right in combination. The convex bow-shaped blade penetrates the ground as shown by the two-dot chain line in Figure 19, making it possible to remove weeds with somewhat deep roots that are difficult to remove by flat scraping, and weeds on relatively hard ground.
This weeding method involves concentrating a pushing force on the ground where only a portion of the convex arcuate blade is in contact, causing the convex arcuate blade to slide in, which is not possible with a straight blade whose blade width in contact with the ground is long.
It is also possible to perform weeding operations such as scraping the ground in a crescent shape or smoothing the ground by operating in a similar position to this weeding position, and the details are as described in the explanation of how to use the weed remover in Example 1.

To provide a weeding tool which has a high weeding speed because the weeding operation can be repeated in a short cycle, shortens the time required for the weeding work, is small, lightweight and has a simple structure, yet can be used to weed using multiple types of weeding methods in combination with the same weeding tool, and has good operability and high utility value.

FIG. 1 is a perspective view of a weeding tool according to a first embodiment. FIG. 2 is a plan view of the weeding tool of the first embodiment. FIG. 3 is a front view of the weeding tool of the first embodiment. FIG. 4 is an enlarged view of the AA cross section of the weeding tool of Example 1. FIG. 5 shows the weeder of Example 1 in a position where the lower surface of the blade is in close contact with the ground and the handle is gripped. FIG. 6 is an explanatory diagram of flat surface scraping with a straight blade of the weeding tool of Example 1. FIG. 7 is an explanatory diagram of weeding using a linear blade inclined relative to the weeding direction. FIG. 8 is an explanatory diagram showing how the force with which the index finger presses the blade plate is increased. FIG. 9 is an explanatory diagram for facilitating the lateral pushing of the blade plate with the index finger. FIG. 10 is an explanatory diagram of the weeding direction of the inclined linear blade. FIG. 11 is an explanatory diagram of the weeding width with respect to the weeding direction in FIG. FIG. 12 is an explanatory diagram showing smooth cutting with a convex bow-shaped blade. FIG. 13 is an explanatory diagram showing concave cutting using a convex bow-shaped blade. FIG. 14 is an explanatory diagram showing the state in which the upper surface of the blade plate faces upward and the leading edge blade performs push cutting. FIG. 15 is an explanatory diagram showing the state in which the lower surface of the blade plate faces upward and the leading edge blade performs push cutting. FIG. 16 is a plan view of FIG. FIG. 17 is an explanatory diagram showing that the weeding method shown in FIG. 15 is impossible with a weeder in which the center lines of the blade and handle are parallel. FIG. 18 is an explanatory diagram showing how the blade plate is set at a steep angle to the ground to cut away and smooth the ground. FIG. 19 is an explanatory diagram of the movement of the blade during the ground breaking operation of FIG. FIG. 20 is an explanatory diagram showing how the upper surface of the blade plate faces upward and digs up weeds. FIG. 21 is an explanatory diagram showing how the lower surface of the blade faces upward to dig up weeds. FIG. 22 is a plan view of the weeding tool of the second embodiment. FIG. 23 is a plan view of the weeding tool of the third embodiment. FIG. 24 is a plan view of the weeding tool of the fourth embodiment. FIG. 25 is a plan view of the weeding tool of the fifth embodiment. FIG. 26 is a front view of the weeding tool of the fifth embodiment. FIG. 27 is an enlarged view of the cross section B-B of the weeding tool of Example 5. FIG. 28 is a plan view of the weeding tool of the sixth embodiment. FIG. 29 is a front view of the weeding tool of the sixth embodiment. FIG. 30 is a plan view of the weeder of Example 7 with the handle held horizontally. FIG. 31 is a front view of the weeder of Example 7 with the handle held horizontally. FIG. 32 is a perspective view of the weeding tool of Example 7 in a position where a type 1 bent blade is used for flat surface scraping. FIG. 33 is a perspective view of the weeder of Example 7 in a position where the type 2 curved blade is used for concave cutting. FIG. 34 is an explanatory diagram of the weeding tool of Example 7 in which the blade plate is turned over and the front edge blade is used for pushing and cutting. FIG. 35 is a perspective view of the weeding tool of Example 7 in a position where the blade plate is turned over and part of the type 2 bent blade is used for smoothing. FIG. 36 is a plan view of the weeder of Example 8 with the handle held horizontally. FIG. 37 is a front view of the weeder of Example 8 with the handle held horizontally. FIG. 38 is a front view of the handle gripped in the position shown in FIG. 37 with the handle at an angle of 25 degrees relative to the horizontal plane. FIG. 39 is a perspective view of the handle rotated left from the position shown in FIG. 38 so that the entire straight blade is in contact with a horizontal surface, ready for flat surface scraping. FIG. 40 is a plan view of the weeding tool of the ninth embodiment. FIG. 41 is a front view of the weeding tool of Example 9. FIG. 42 is an enlarged view of the CC cross section of the weeder of Example 9. FIG. 43 is an explanatory diagram of a convex arcuate blade and an obtuse angled blade. FIG. 44 is an explanatory diagram of a concave arcuate blade. FIG. 45 is an explanatory diagram of a bending blade.

Since the present invention describes a large number of embodiments and the contents of the specification are broad, a section (Explanation of the Key Points of the Claims) is provided at the end of the specification, and the key points of each claim are explained for each claim.

When the left and right edges of the blade plate have different shapes, the usability of the left and right edge blades varies depending on whether the operator is right-handed or left-handed. Therefore, depending on the weeding method, it may be easier to use a blade with the left and right edge blades of the opposite shape to that shown in the example.
Only the weeder in Example 6 and Figure 28 employs an exceptionally long blade plate in order to widen the cutting width, but for other shapes of weeders, blade plates with a length of around 60 mm are easy to use from the standpoint of operability.

Although there are differences in the shape and size of the blade plate and the shape of the blade body among Examples 1 to 4, Fig. 1, and Figs. 22 to 24, the outline shape of the blade body, the angle between the blade plate and the handle, and the positional relationship between the blade plate and the handle in front view are all similar to those in the front view of the weed cutter of Example 1, Fig. 3, and the cross-sectional shape of the blade plate is similar to that in Fig. 4, so Figs. 22 to 24 of Examples 2 to 4 are only plan views.

The shape of the handle in each of the drawings of the embodiments and each of the explanatory drawings is the same as that of the weeder of Example 1, FIGS. 1 and 3, and in the drawings showing only the front part of the handle, the other parts are omitted.

Hereinafter, the weeding tool of the present invention will be described with reference to Examples 1 to 9 with reference to Figs. 1 to 42. However, Figs. 1 to 21 relate to the shape and usage of the weeding tool of Example 1.
In each example, except when weeding by holding the handle with both hands, a small rake held in the other hand is used to weed and remove the weeds that have been removed in parallel, making it easier to see which weeds have been missed and allowing for efficient weeding. A small, lightweight metal rake with a handle length of about 35 cm is suitable for removing weeds that have been cut, for pushing weeds together, and for hitting weeds with the back of the rake to remove the soil attached to the roots.

FIG. 1 is a perspective view of the weeding tool of Example 1, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the same, and FIG.
FIG.
In FIG. 1, the mounting portion 3 of the blade body 4 is mounted on the underside of the front portion of the handle 11, the raised portion 2 is located below the front end 12 of the handle, and the blade plate 1 is located in front of that.
A straight blade 6 is formed on the left edge of the blade plate 1, and a convex arched blade 7 is formed on the right edge, and the tip of the blade plate is sharp. In Fig. 3, the rising portion 2 is bent at the upper and lower parts to provide a step, and the blade is formed up to approximately the midpoint of the height of the step.
In this embodiment, the straight blade is placed on the left edge, and the blade is arranged in a way that prioritizes the use of a right-handed person who uses the straight blade to weed from right to left, left rear, and rearward. In terms of the relationship between the dominant hand and the weeding direction, when a left-handed person uses the straight blade to weed from left to right, or when a right-handed person uses the convex bow blade to weed from right to left, it is slightly easier to use a blade plate with an edge shape that is the opposite of that shown in Figure 2. In the weeding method in which the handle is pushed forward and downward, there is almost no difference in operability regardless of whether the dominant hand is left or right.

In FIG. 2 , since the shape of the blade plate is asymmetrical, the blade plate is shifted to the right with respect to the handle width center line 18 in order to correct the left-right balance of the blade plate.
The blade angle 20 of the linear blade is 60 degrees, and in a plan view during weeding, the blade moves in an inclined state with respect to the weeding direction 55 as shown in FIG. 7 to scrape the ground and remove weeds. In addition, as shown in FIG.
Scraping can be performed in any direction between the X and Y directions.

In Fig. 3, the handle 11 is inclined relative to the blade plate, and the inclination angle 40 of the handle is set to 25 degrees. By inclining the handle, even if the height difference of the rising part 2 is small, it is possible to avoid interference between the fingers gripping the handle and the ground as shown in Fig. 5, and since the operation can be performed with almost no bending of the wrist, it is suitable for long-term work, and there is an advantage that the handle can be operated at an appropriate angle relative to the ground even in several types of weeding methods in which the blade plate is turned over as shown in Fig. 15 and similar methods.
The blade formed on the rising portion 2 serves to cut the ground when the blade is inserted somewhat deeply to scrape the ground.
The raised portion and the inclined handle, as shown in FIG. 5, move the fingers gripping the handle away from the ground 50 to avoid interference and bring the point of force closer to the blade plate, so that the handle can be gripped at a position close to the ground near the front end of the handle and weeds can be removed by scraping the ground left and right with the blade held down effectively.
Furthermore, when weeding operations are repeated at high speed, it is advantageous for the blade to be moved instantaneously and accurately to the weeding start position, which changes from moment to moment, if the gripping portion is closer to the blade plate.
This raised section and slanted handle are ideal for removing weeds that grow along stone or concrete walls.
You can avoid interference by keeping your fingers holding the handle away from the sides of the stone and the wall.
Weeders in which the center lines of the blade and handle are parallel are unsuitable for long-term weeding because the handle is nearly horizontal in the weeding position shown in Figure 5, requiring the user to keep the wrist and hands bent upward. Also, in the weeding method shown in Figure 15, in which the blade is turned over and pushed to shave, the direction in which the handle is pushed and the direction of the blade tip match as shown in Figure 17, so the blade tends to go straight deep into the ground, making this unsuitable for weeding operations that involve thin scrapings of the ground.

By making the handle thicker, the contact area with the fingers and palm holding the handle is increased, allowing for a firm grip, and the slightly elliptical cross-sectional shape makes it less slippery than a handle with a circular cross-section when rotating the handle for weeding, and a thick handle has the advantage of requiring less force to rotate, making it very easy to use.
In the weeding method in which the blade plate is turned over and the handle is pushed to remove weeds, the handle with a thinner front portion in Fig. 3 avoids interference between the front portion of the handle and the ground as shown in Fig. 15 and Fig. 21, and enables several types of easy-to-use weeding methods to be performed in this position. In the weeding method in which the blade plate is turned over and the handle is held so that the rear portion of the handle is in contact with the palm of the hand, the handle with a thinner rear portion in contact with the palm of the hand is held so that the rear portion of the handle fits snugly against the palm of the hand, and there is no discomfort caused by the corners of the rear portion of the handle hitting the palm, making it easy to grip and push.

The weeding tool of Example 1 can be used for about 10 different weeding methods. The usage of the weeding tool is as follows:
The following description will be given in order from FIG. 1 to FIG.

The first method of use is to remove weeds by using the slanted straight blade on the left edge of the blade to scrape flatly to the left.
The handle is held as shown in Figure 5, and the underside of the blade plate is placed against the ground 50. The handle is rotated slightly to the left to tilt the blade plate slightly against the ground, and the weeder is swung from right to left as shown in Figure 6, and the blade tilted against the weeding direction 55 is used to scrape the ground as shown in Figure 7, allowing multiple weeds to be removed at the same time.
As shown in Figure 5, the handle of this weeder is located low and close to the ground, and the thick handle with an oval cross section can be firmly gripped. This eliminates the problem with the weeding tool in Patent Document 5 mentioned above, that is, when scraping the ground with the blade on the side edge, the moment the blade is subjected to load, the entire weeder tilts in the direction of weeding, and it is also possible to scrape the ground somewhat deeply.
When the weeder is swung from right to left to scrape the ground, the blade traces an arch-like path as shown in Figure 6. When the weeder is moved in a straight line from right to left, the whole arm is used to operate it, which makes it somewhat difficult to use and increases the repetitive cycle of the weeding operation, whereas when the weeder is swung from side to side using the elbow or wrist as a fulcrum, the repetitive cycle is short, making it easy to use and easy to operate.
Depending on the distribution of weeds, you can either use your elbow or just your wrist to remove them.
Weeds may be removed in small increments, but it is possible to remove weeds 2 to 4 times per second.
The technique of placing the index finger on the front right side of the handle in Figure 9 brings the point of force closer to the blade plate and facilitates the operation of pushing the blade to the left, making it easier to weed the ground and making it easier to weed, and is an excellent operating method not available with conventional weed cutters.
The weeding method of swinging the weeder back and forth is ideal for removing a large number of small weeds. After repeating this weeding operation 5 to 20 times, you can remove the weeds that you have removed with a small rake held in your other hand, and then repeat this weeding pattern to remove any weeds that you have missed, allowing you to remove weeds efficiently.

The linear blade of this weeder is inclined in the weeding direction, and as shown in FIG. 10, any weeding direction can be selected within a 90 degree interval from the X direction to the Y direction.
In FIG. 10 and FIG. 11, the width of the ground to be cut is X1 in the X direction, Y1 in the Y direction,
In the Z direction, Z1 is the maximum and Y1 is the minimum.
In this embodiment, if the weeding width Z1 is 100%, X1 is 86% and Y1 is 50%.
The Z direction allows for the widest weeding width, but the blade is perpendicular to the weeding direction, so the load on the arms is the greatest. The Y direction allows for the smallest weeding width, but the load on the arms is the lightest, and it is possible to weed dry, slightly hard ground that is difficult to weed in the Z direction, and weeds with stubborn roots. Compared to the X and Z directions, it is easier to weed and can weed the ground lightly, and is also suitable for weeding wet ground. It is an excellent weeding method with improved sharpness and usability.
When using this weeder with the left hand to cut in the Y direction, it is easier to cut by holding the handle sideways and cutting from right to left than by pulling the handle towards you.
The ease of weeding varies greatly depending on the geology and the dryness of the ground, so by using different weeding directions, ground that is easy to weed can be weeded to the maximum width, and hard ground that is difficult to weed or weeds with stubborn roots can be weeded by narrowing the weeding width.
Because the blade plate and the handle are adjacent, when weeding in the Y direction, by holding the front end of the handle with the index finger as shown in Fig. 8, it is possible to perform an operation with one hand similar to the operation of the weeder of the above-mentioned Patent Document 2, in which the blade is pressed against the ground with both hands while pulling the handle toward you to weed. Because the blade is greatly inclined in the weeding direction, the ground can be scraped easily, and the shape of the blade plate shifted to the right makes this operation even easier.

On ground with many weeds, some will be missed even if you think you have scraped them off, so a convex bow-shaped blade with a narrower cutting width is more suitable for scraping these weeds than a straight blade. As shown in Figure 13, you can instantly remove the weed by placing the convex bow-shaped blade against the base of the weed and twisting your wrist as if scooping up the weed.
The pushing and cutting weeding method 5 is also suitable for cutting off weeds that have not been removed by the weeding method.

Figures 8 and 9 show usage methods in which the point of force is even closer to the blade plate. Because the blade plate is located just in front of the grip, pressing the front top surface of the handle with the index finger as in Figure 8 helps to press the blade against the ground, and placing the index finger on the front right side of the handle as in Figure 9 helps to push the blade to the left.

The second method of use is to remove weeds by smoothing them down with the convex arched blade on the right edge of the blade.
In this weeding method, the weeder is swung to the right as shown in Figure 12, and the convex-arc-shaped blade moves in a convex-arc shape, stroking the ground, thus removing weeds by stroking.
Using a technique similar to that shown in Figure 9, by placing your thumb against the front left side of the handle, the point of force will be closer to the blade plate, facilitating the action of pushing the blade to the right, making it easier to sharpen.
When you use your wrist or elbow as a fulcrum and swing the weeder to the right, the blade moves in an arch shape. The convex arch blade moves in an arch shape, stroking the ground, so the width of the ground it cuts is narrow, but it has the advantage of being able to remove weeds with less force. This is similar to how a curved sword cuts better than a straight sword.
In the operation of weeding by swinging the right hand to the right in FIG. 12, it is more convenient to swing the wrist and hands to the right to weed, as described below, than to swing the right arm widely to weed.
For weeds with shallow roots, it is easier to remove them by stroking the tool with just your wrist and forehead, which allows for quick, repetitive movements. The operation is as follows:
In this embodiment, since there is a convex arcuate blade on the right edge, due to the movable angle of the wrist joint, it is easier to cut weeds by moving from the front left to the front right when operating with the right hand, and from the front left to the front right when operating with the left hand.
For small weeds with shallow roots, the convex arched blade can be placed against the base of the weed and the wrist tip can be moved 45 to 60 degrees to the right to remove the weeds, allowing the weeding operation to be repeated in short cycles.

The third method of use is to use a convex-blade to scrape the ground in a concave shape. When scraping flat with a straight blade, the force of the arm is distributed over the entire length of the blade, whereas in concave scraping, part of the convex-blade edge is used to scrape only the ground where the weeds are, so the force of the arm is concentrated in this part, making it suitable for removing a single weed and providing a stronger scraping force than with a straight blade.
When removing a single sparsely grown weed, the straight blade on the left edge uses the entire width of the blade to remove more ground than necessary, whereas a weeding method that uses part of the convex arcuate blade to remove the ground in a concave shape can remove only the necessary ground around the weed.
As shown in Figure 13, you can instantly remove a weed by placing the convex bow blade next to the weed and twisting your wrist to scoop up the ground where the weed is to the right. You can also place the convex bow blade in front of the weed and scoop it up to the other side. This weeding method can also be used to remove weeds in recessed areas that are difficult to remove with a straight blade.
This weeding method, which shallowly removes the ground around the weeds in a concave shape, can be performed 2 to 3 times per second. If you operate the weeding method by placing your thumb on the left side of the front end of the handle, you can increase the force pushing the convex arcuate blade in the direction of the weed, making it easier to weed.

This weeding method, which involves scooping the ground with a convex arched blade, is also suitable for removing small weeds that grow close to the sides of stone or concrete structures.
If the stone or concrete structure is tall, hold the handle with your left hand and point the convex blade downwards.
Place the underside of the blade along the side of a stone or concrete structure, insert the centre of the convex arched blade vertically into the ground and rotate the handle to the left to remove weeds.
In this embodiment, the convex bow-shaped blade is on the right edge, so when the convex bow-shaped blade is pointed downward to weed the side of a high wall, the right hand is on the side farthest from the wall, making it difficult to operate with the right hand and requiring operation with the left hand.
If the wall or stone is low, you can operate it from above with your right hand.
In the above operation, the handle is held at an angle to the ground and the central blade of the convex bow-shaped blade is used to remove weeds, but if the handle is held vertically and the front part of the blade plate is inserted from above along the wall and then the handle is rotated to dig up the weed, it can be operated with the right hand even if the wall is high.
The raised portion and the handle that is inclined relative to the blade plate keep the fingers gripping the handle away from the wall surface, thereby preventing interference with the wall surface.

The fourth method of use is weeding by rotating the blade. In the concave blade position shown in FIG.
With the convex bow-shaped blade pressed against the base of the weed, rotate the handle counterclockwise from 60 degrees to 1 degree in a plan view.
This is a method similar to the smooth cutting method, where the blade is rotated about 20 degrees to the right. The convex bow-shaped blade moves around the weeds, making it easy to cut them, and it is also possible to remove weeds with widespread roots that are difficult to cut on a flat surface or to scoop up the ground with the convex bow-shaped blade.
This operation can be performed repeatedly in relatively short cycles by rotating the handle using only the wrist and hand, making it possible to scrape off small pieces of the ground around the weeds.
If you place your thumb on the front left side of the handle, you can press the convex arcuate blade against the ground more firmly, making it easier to shave.
Holding the handle with both hands and rotating the handle while pressing the convex arched blade against it makes it easier to cut down, and this method is suitable for removing weeds with widespread roots or slightly larger stalks.

The fifth method of use is a weeding method in which the upper surface 25 of the blade plate faces upward as shown in FIG. 14 and the leading edge blade 8 of FIG. 1 is used to push and cut away weeds.
In Figure 14, the tip of the front part of the convex arcuate blade is placed on the ground in front of the weed, and the handle is pushed forward to thinly scrape the ground and instantly remove the weed. In Figure 3, the blade plate is inclined so that the angle of the blade plate to the ground is shallow relative to the center line 36 of the handle, so this weeding method is suitable for scraping off shallow-rooted weeds and liverwort. Pressing the front edge of the blade and rotating the handle left and right several times makes it easier for the blade to penetrate and allows a relatively wide area to be scraped off.
For weeds with stubborn roots, twist the handle about 15 degrees to the left and right while pressing the front edge of the blade against them, which makes it easier for the blade to penetrate into the ground and make it easier to remove the weed.
To do this weeding operation, twist the handle left and right once or twice so that the blade penetrates the ground.
It is also effective for weeding stubborn weeds or weeds on hard ground that are difficult to remove by swinging the blade to the right. Holding the handle with both hands allows you to press the blade firmly, making it easier to remove weeds.

The sixth method of use is to use the leading edge blade 8 in Fig. 1 to turn over the blade plate in Fig. 15 and push it down, which is a unique weeding method of this weeding tool, and is extremely easy to use and ideal for cutting off weeds one by one. This weeding method of turning over the blade plate to cut off weeds is a feature not found in conventional weeding tools, and the fact that this method is possible has greatly contributed to improving the ease of use of this weeding tool.
In Figure 3, this weeding method is made possible by using a handle with a thinner front and a blade that is inclined relative to the center line of the handle. A handle with a thinner rear makes this weeding method easier to use.
In Figure 15, the thickness of the front part of the handle is made thin to prevent the front part of the handle from interfering with the ground, and the handle is moderately inclined with respect to the blade, so that even when the blade is turned upside down, the angle with respect to the ground is moderate, making this weeding method very easy to use. This is an excellent weeding method that is frequently used when weeding a single weed.
In FIG. 3, a straight line 29 is parallel to the center line of the handle and passes through the lower surface of the grip of the handle.
By making the blade cross the weeding blade in a shape such that the blade crosses the weeding blade, the blade is inclined at a suitable angle to the ground even in the weeding method of FIG.
FIG. 15 is a front view of the weeding tool in the weeding position for this weeding method, and FIG. 16 is a plan view.
As shown in the figure, turn the blade over, hold the back of the handle with your palm, and push the handle to instantly cut off the weed. This weeding method uses part of the front edge of the convex arcuate blade to remove the weed, so the width of the weed is narrower than when using the straight blade on the left edge to remove it flat, making it suitable for removing individual weeds.
In FIG. 15, the blade is inclined downward and forward with respect to the center line 36 of the handle.
The special feature of this weed remover is that by pushing the handle in a straight line, the angle between the direction in which the handle is pushed and the direction in which the front edge of the blade faces is balanced, allowing the weed to be removed by thinly scraping the ground to an almost constant depth.
With the weeding tool in Patent Document 2 mentioned above, the direction in which the blade is pressed and the direction in which it is scraped are different, so the operation of pressing the blade against the ground and the operation of pulling the handle to scrape the ground are done simultaneously with both hands, whereas with this weeding method, the handle is simply pushed in a straight line, and the blade is pressed against the ground and moved simultaneously, making it possible to scrape the ground to an almost constant depth. This method is extremely easy to operate and allows weeding operations to be performed 2 to 3 times per second.
In this weeding method, it is effective to twist the handle left and right while pressing the front edge of the blade against the weeds with stubborn roots. This method can also be used to weed on hard ground, and by twisting the handle and pressing the blade against the weeds, it is possible to weed the ground in front of the blade from the front side to the front side.
In the weed remover shown in Figure 17 with a blade plate parallel to the center line 36 of the handle, the direction in which the blade at the front edge of the blade plate faces coincides with the direction in which the handle is pushed, so the blade plate tends to move straight down deep into the ground, making it unsuitable for use in cutting off weeds by pushing the handle.

The seventh method of use is to cut up the ground by tilting the convex arch-shaped blade at a steep angle and pushing the handle, which is suitable for weeding on relatively hard ground. Figure 18 is an explanatory diagram of this weeding method.
In this weeding method, the convex arched blade is set at a steep angle to the ground and the handle is pushed in the direction in which the front end of the blade plate is facing, i.e., in the direction a in Figure 18, to cut up the ground and remove weeds.This is a very effective weeding method on hard ground.
With this weeding method, a straight blade has a wide blade width that touches the ground, making it difficult for the blade to penetrate the ground. However, with the protruding edge of a convex arched blade, only a portion of the blade comes into contact with the ground. By pushing the handle diagonally downward toward the front end of the blade, the blade slides against the resistance of the ground as it penetrates, cutting into the ground and removing weeds.
If you press the handle against the ground with the convex bow blade perpendicular to it, it will just make a cut in the ground.
By tilting the blade slightly or twisting the handle left and right while pushing it, you can cut into the ground and remove weeds.
The weeding method of Figure 15 described above removes weeds by thinly scraping away the ground, whereas this weeding method has a sharp blade angle and the convex arch-shaped blade penetrates somewhat deeper into the ground, cutting up the ground and removing weeds.
In FIG. 18, the rear part of the handle is grasped with the palm of the hand, the convex arcuate blade is inclined at a steep angle to the ground, the front edge is placed on the ground in front of the weeds to the right and the handle is pushed in the direction a.
In Figure 19, when the handle is pressed, the convex arched blade moves forward as shown by the two-dot chain line and penetrates into the ground, breaking up the soil and removing weeds. Using both hands for operation makes weeding easier.
This weeding method is also suitable for removing weeds from dry, relatively hard ground that is difficult to remove by flat scraping. If you push the handle while twisting it from side to side, the blade can penetrate more easily and it becomes easier to cut up the ground.

This weeding method can also be used to scrape off the ground in a crescent shape. If you tilt the blade slightly to the right and loosely grip the rear of the handle and push the handle, the convex bow blade will have a rounded shape, as shown in Figure 3.
Because the blade is inclined toward the center line of the handle, the convex bow-shaped blade penetrates into the ground while slightly rotating to the right. After cutting away the surface of the weed, the blade will emerge above ground when the pressure on the handle is reduced.
It can scrape away the ground in a crescent shape with a V-shaped cross section, shallow at both ends and wide and deep in the middle.
It can be used to remove individual weeds with relatively deep roots.

In FIG. 18, as the angle between the blade plate and the ground is gradually decreased from a steep angle,
This cutting method is similar to the push cutting method shown in Figure 15.
A weeding method intermediate between this cutting away of the ground and the push-and-scrape method of FIG. 15 will be described below, in which the angle between the blade and the ground in FIG. 18 is about 60 degrees, and the handle is pushed in the direction b to remove weeds.
In this weeding method, the pushing force is concentrated on a part of the edge of the convex bow-shaped blade that is in contact with the ground, the width of the ground is narrow, and the blade moves diagonally forward to the right, resulting in a smooth weeding motion that can effectively weed even relatively hard ground.It is a very easy and effective technique to use, and is operated as follows.
By pushing the handle in the direction b, which is slightly diagonally forward from the direction in which the tip of the blade faces, the cutting width is narrow but the cutting force is strong, making it possible to easily cut off a single weed, and it is possible to repeat the operation 2 to 3 times per second. This is one of the excellent weeding methods of this weed remover.

The eighth method of use is a weeding method in which the roots of weeds are cut and the weeds are dug up together with the ground.
The difference with the weeder is that the action of inserting the forked tip into the ground is a preparatory action for pulling out weeds, whereas with this weeder, when the tip of the blade is inserted into the ground to a certain depth, the roots are cut by the leading edge of the blade, and the root cutting is already almost complete. This weeding method is similar to flat scraping and
It is also suitable for weeds that have slightly deeper roots than those that can be removed by pushing.
Compared to the weed remover of Patent Document 1, which inserts sharp weed-removing claws into the ground and pulls out the entire root, this weed remover makes it easier to dig up the weeds since the root cutting is almost complete.
Fig. 20 shows digging with the top surface of the blade plate facing upward, and Fig. 21 shows digging with the bottom surface of the blade plate facing upward. In Fig. 21, if you hold the rear part of the handle with your palm, there will be no slippage even if you hold it loosely, and it is easy to push the handle and insert the blade.
In the weeding tool of Patent Document 1, the rear part of the handle is pushed down to pull out weeds, whereas in this weeding method, the root cutting is almost completed at the time the blade plate is inserted into the ground, so that by rotating the handle around the convex bow-shaped blade as a fulcrum, the ground above the blade plate that has penetrated into the ground can be dug up, along with the weeds.
In the operation of rotating the handle, a handle with a thick oval cross section can be rotated with less force and is less likely to slip than one with a circular cross section, making it suitable for this operation. The weeding method of Figure 21 is easy to operate, and the series of operations of inserting the front part of the blade plate into the base of a weed and rotating the thick oval cross section handle to the right to dig it up can be repeated in a shorter cycle than the weeding tool of Patent Document 1, making it possible to perform weeding operations about twice per second.
As shown in Figures 20 and 21, insert the blade diagonally downward just before the roots of the weeds.
In the example shown in FIG. 21, the handle is rotated to dig up the weeds, or the rear part of the handle is pushed down. In the example shown in FIG. 22, the handle is rotated to dig up the weeds.
Digging by rotating the handle is easier to operate and allows for quicker repetitive operations. The protruding edge of the convex arcuate blade can be used as a fulcrum when rotating the handle to dig.
The blades in Figure 20 are suitable for removing shallow-rooted weeds, while those in Figure 21 are suitable for removing slightly deeper-rooted weeds. By using the upper and lower blade faces depending on the type of weed being removed, the digging depth and the angle at which the blades penetrate into the ground can be selected.
The weeding operation performed by turning the blade over as shown in Figure 21 is also effective for small weeds that are difficult to remove.
The series of operations of inserting the front part of the blade into the base of the weed and rotating the handle to dig it up is effective for removing sparsely grown weeds.
It is suitable for removing a large number of weeds with somewhat established roots, and is capable of repeated operations about twice per second.
A steeper angle of the blade in Figure 20 would allow for deeper digging. This weeding operation is also suitable for removing purple wood sorrel bulbs, a troublesome weed that cannot be removed by ground scraping methods.

The ninth method of use is to cut and scoop out the roots of weeds, which is effective for removing single weeds with widespread roots. In the position shown in Figure 20, insert the blade deeply into the weed from the base, diagonally downward, and rotate the handle to the right to cut and remove the weed. By rotating the handle in combination, it is possible to scoop out smaller weeds. Larger weeds can be removed more easily by holding the handle with both hands.

The tenth method of use is for weeding on dry, hard ground or ground mixed with pebbles. In such ground, it is difficult to remove weeds by scraping them off, so this method of weeding involves concentrating the pushing force on the narrow blade width part where the tip of the blade plate touches the ground, and twisting the handle left and right to press the tip of the blade plate against the roots of the weeds, which is an effective weeding method on hard ground.
In the same position as in FIG. 15, the lower surface of the blade is faced upward, and the tip of the blade is placed against the ground just before the roots of the weeds.
If you press the blade against the ground while twisting the handle slightly left and right, the tip will penetrate into the ground and you can easily remove weeds. This weeding method is effective on hard ground because you can remove weeds by pressing the tip of the blade against the ground and twisting the handle once or twice.
Similarly, on ground mixed with pebbles, by slightly twisting the handle left and right and pressing the tip of the blade against it, the tip of the blade will push aside the pebbles and penetrate, making it easy to remove weeds.
This weeding method is also effective for removing weeds with stubborn roots. By twisting the handle and pressing the tip of the blade against the weed, the blade can easily penetrate the weed, making it an ideal method for removing weeds that are difficult to remove.

The eleventh method of use is a weeding method in which a curved blade formed at the rear of the convex arch-shaped blade and at the bottom of the rising part is used to remove small concave pieces of ground around weeds.
If you place the rear blade of the convex arch blade and the curved blade formed at the bottom of the rising part (part 16 in Figure 2) on the ground to the left of the weed and twist your wrist as if scooping it diagonally forward to the right, you can instantly scrape off a small piece of ground around the weed. When operating with your left hand, place the blade of part 16 on the front left part of the weed and scrape it off toward the front right.
In this embodiment, the lower part of the rising part from the rear part of the side edge projects to the right side of the handle, so that the curved blade at part 16 can be used to easily scoop up a small piece of ground at the base of the weeds.
If you place your thumb on the left side of the front end of the handle when using with your right hand, or your index finger on the left side when using with your left hand, you can push the blade to the right more easily, making it easier to sharpen.

FIG. 22 is a plan view of a weeder of Example 2. The blade plate has a similar shape to that of the weeder of Example 1.
The angle 20 of the straight blade is set to 45 degrees, and when cutting the ground to the left, the weeding width is narrower than that of the weeder of Example 1, making it easier to cut.
10 and 11, in the weeding tool of Example 1, the weeding width X1 when shaving in the X direction is 86% of the weeding width Z1 in the Z direction perpendicular to the blade. In the weeding tool of this example, the weeding width in both the X and Y directions is about 70% of the maximum weeding width. Although the weeding width is the same in the X and Y directions, the operation of shaving in the X direction has the advantage that the elbow and wrist can be swung left and right to perform a fast repetitive operation.
By cutting in a direction perpendicular to the straight blade, the maximum width of weeds can be removed. Depending on the dryness of the ground, how easy it is to cut the ground and weeds, and whether there are obstacles on the left or right, you can cut left or right, or diagonally backwards.
You can choose to pull the handle back and shave backwards.
The uses of the convex arched blade are the same as those of the weed remover of Example 1. Since the width of the blade at the front arched edge is wide, it is suitable for push cutting and rotary cutting, and since the convex arched edge is long, it is easy to use for applications that require frequent use of the convex arched blade.

Example 3, Fig. 23, is a weeding tool with a slender blade compared to the weeding tool in Example 1. Although the rigidity is reduced, the weight is light, making it ideal for applications in which the operation of swinging the blade to the left and scraping the ground with the straight blade is repeated at high speed, and the ground can be scraped continuously and lightly. If the method of Fig. 9 for promoting the force to push the blade in the weeding direction is used, it becomes even easier to use and reduces arm fatigue.
The narrow blade width has the advantage that soil is less likely to adhere to the blade than with the weeder of Example 1 when weeding on wet ground.
It has a straight blade on the left edge and a convex arcuate blade on the right edge, and in terms of functionality it can perform weeding operations almost similar to those of the weeder in Example 1.
In a weed removal method in which the ground around weeds is scooped up, if the blade is wide, frictional resistance increases when the blade is rotated underground, and if the blade is inserted deeply into the ground, the movement of the blade is restricted, making it difficult to scoop out small diameter weeds.
A slim blade makes it easier to penetrate the ground and allows more freedom when rotating the blade underground.
It has little frictional resistance, is small in diameter, and is suitable for somewhat deep gouging. It is similar to using a thin saw to cut a circle out of a wooden board. When gouging, it is easier to cut by inserting the blade into the base of the weed and then rotating or pivoting the handle toward the convex-bow shaped blade.
This weeder has a narrow blade and a sharp blade shape, making it suitable for weeding in tight spaces and ideal for removing weeds that grow around the base of small flowering trees. Because the blade is narrow, it is also easy to use for removing weeds that grow in the gaps between crops in fields.
Small weeds growing on soft ground can be removed by scooping them up with the front part of the straight blade, while larger weeds can be easily removed by picking up the stems with the other hand. For removing weeds growing in the valleys between the ridges of a field, a convex bow blade is more suitable than a straight blade because it allows for a scooping operation.
The technique of turning the blade over and pressing the tip against the base of the weed while twisting the handle left and right is suitable for weeding on hard ground, and even in ground mixed with pebbles, the sharp blade can easily push the pebbles aside and remove the weed.
It can also be used to dig up weeds; as the blade is tilted to the left, when the front part of the blade is inserted into the base of a weed, the width of the blade below ground is slightly wide, allowing the handle to be rotated to dig up the weed.
On relatively hard ground, the series of operations of turning the blade over, inserting the front part into the base of the weed and rotating the handle to dig it up is easy to use and can be repeated about twice per second.

Example 4, Figure 24, shows a weeder with a wide leaf-like symmetrical blade plate, with a convex bow-shaped blade and a straight blade with a blade angle of about 70 degrees and 140 degrees on both the left and right side edges. Since the convex bow-shaped blade and the straight blade are provided on the same side edge, two types of blades can be used in the same weeding direction, and it can be used by either right-handed or left-handed people.
The blade on the front edge is for pushing, cutting roots and digging up. By turning the blade over and pressing the tip against the base of a weed and twisting the handle left and right, it is possible to remove weeds on hard ground. It is also possible to insert the front part of the blade into the base of a weed and dig it up.
The straight blades on the front edges on both sides of the sharpened part are used for push-cutting, with the front and back of each blade being used separately. The straight blades on the rear edges of the left and right edges are used for flat cutting, and the convex arched blades can be used for multiple purposes, just like the weeder in Example 1.
It can also be used to cut the roots of relatively large weeds with many stems, and is used as follows:
In the same position as in Figure 20, hold the handle with both hands, hold the blade at an angle of 30 to 60 degrees to the ground, and place the front end of the blade on the ground in front of the weed. If you tilt your upper body forward and downward, the entire blade will penetrate into the ground under your body weight, making it easy to cut the roots.
This weeding method makes it possible to cut relatively large weeds by using body weight without using physical strength. Even weeds with multiple stems and a base diameter of about 50 to 60 mm can be removed by shifting the blade position and performing this operation about twice. The ground where weeds grow is relatively soft, making this weeding method possible.

FIG. 25 is a plan view of the weeding tool of Example 5, FIG. 26 is a front view of the weeding tool in a position where the underside of the blade plate other than the straight blade portion on the left edge is in intimate contact with a horizontal surface 45, and FIG. 27 is an enlarged view of the B-B cross section of the same weeding tool.
In this embodiment, as shown in Figs. 26 and 27, the left edge of the straight blade is bent slightly obliquely downward with respect to the blade plate.
With this shape, when the blade is pressed against the ground and scraped to the left, the blade does not wobble, and the tip of the straight blade protrudes slightly diagonally downward from the reference plane to which the underside of the blade is in contact, making it easier to scrape the ground thinly and suitable for simultaneously scraping off multiple weeds ranging from a few mm to about 40 mm in height.
With the lower surface of the blade plate in close contact with the ground and the blade plate pressed against the ground, the blade plate is moved in the direction from the X direction to the Y direction in FIG.
By cutting in the direction, you can scrape off a thin layer of the ground. By holding the front top of the handle with your index finger, you can help press the blade into the ground.
If the blade plate is not in contact with the ground but is inclined appropriately, it can be used in the same way as the straight blade of the weeder in Figure 1. The convex arched blade on the right edge can be used for multiple purposes, just like the weeder in Example 1.

Example 6, Figs. 28 and 29 show a weeder having a rising portion 67 provided at a midpoint between the front end and the rear end of the blade plate, Fig. 28 being a plan view and Fig. 29 being a front view.
By providing the rising portion at the middle position of the length of the blade plate, it is possible to avoid the distance from the lower part of the rising portion to the front end of the blade plate becoming long, and this shape is advantageous for weed cutters with long blade plates.
The blade plate is shifted to the right to ensure proper left-right balance, and is joined with rivets.
This embodiment is equipped with a long straight blade, which is advantageous for smoothing and is suitable for flat surface shaving with a wide shaving width. The convex bow-shaped blade on the right edge is for smoothing, concave shaving, and pushing, and the sharp tip is used to pierce the base of weeds and pull them out.

Example 7, Figures 30 and 31 show a weeder equipped with a type 1 bent blade on the left edge of the blade plate and a type 2 bent blade on the right edge, with Figure 30 being a plan view and Figure 31 being a front view, with the handle held horizontal. The blade plate, which has a flat surface with a concave bow-shaped left edge and a convex bow-shaped right edge, is bent to gently protrude downward as shown in Figure 31, with the left edge 77 being a type 1 bent blade and the right edge 78 being a type 2 bent blade.
The blade 77 on the left edge of this weeder is unique in that it is a curved blade that rotates to scrape flat surfaces. The blade 78 on the right edge is a curved blade that is used for scraping concave surfaces, making it easier to scrape the ground by scooping it up compared to a flat convex bow-shaped blade. This weeder is used as follows.

The first method of use is a weeding method in which flat weeding is performed using the type 1 bent blade 77 on the left edge. In the weeding posture shown in Figure 32, the entire blade of the type 1 bent blade 77 is in contact with the ground in an arch shape, the type 2 bent blade on the right edge is raised above the ground, and the blade plate is at a moderate inclination angle to the ground.
Because the blade makes contact with the ground in an arched shape, it is less likely to wobble than a straight blade, and when the weeder is swung in the direction of the arrow, it makes contact with the ground in a concave arch, is moderately inclined relative to the ground, and the blade, which is also inclined relative to the weeding direction, moves in a convex arch while rotating in a stroking manner to cut the ground.This makes it very easy to cut on a flat surface, and it is possible to weed 2 to 3 times per second.
This weeding operation utilizes the fact that the blade's trajectory is arched by swinging the weed cutter from side to side, and the arched blade is moved in an arched manner at a moderate angle to the ground to remove weeds by stroking them.

The second method of use is to use the Type 2 curved blade 78 on the right edge to scrape the ground at the base of the weed into a concave shape. As shown in Figure 33, the blade is placed against the side of the weed and the weed is removed by scooping it up in a forward right direction, allowing for two to three weeding operations per second. The curved blade makes it easier to scrape a concave shape compared to a flat convex bow blade, and it can also scrape off weeds that have grown in a concave shape.

The third weeding method is a weeding method in which the type 2 bending blade 78 on the right edge is turned and scraped.
In FIG. 30, the type 2 bending blade on the right edge curves from the rear right to the front left.
As shown in Figure 33, place the blade against the side of the weed and rotate the handle counterclockwise in a plan view.
When the weed saw is operated to scrape off the ground around the weeds, the blade on the rear right edge penetrates the ground when turning and scraping begins, and then the part of the blade scraping the ground slides from the rear right edge and gradually moves to the front right edge, completing the turning and scraping. This is a method of scraping off the ground by gently stroking it with a curved blade.
This weeding method is suitable for removing small weeds with widespread roots because the curved blade moves around the side of the weed, making it easy to remove. When used in conjunction with rotating the handle, it is possible to remove small weeds.

The fourth weeding method is to turn the blade over and use the front edge of the blade to push and cut away the weed, as in Figure 34. Like Figure 15, this is a very easy-to-use method that is suitable for removing individual weeds. Place the front edge of the blade against the base of the weed and push the handle to instantly cut and remove the weed.
In this position, you can also remove weeds from hardened ground by twisting the handle left and right and pressing the blade against it.

The fifth weeding method is to cut off weeds one by one by holding the blade at a steep angle to the ground and pushing the handle slightly forward from the direction the tip of the blade is facing, in the weeding position shown in Figure 35. This weeding method involves stroking the blade at a steep angle to the ground. The cutting width is narrow, but the cutting force is strong, making it suitable for weeding on relatively hard ground. It is the same as pushing the handle in the direction b in Figure 18.

Figures 36 and 37 show the weeder of Example 8 in a position where the handle is held horizontally and the rear parts of the left and right edges are in contact with a horizontal surface, with Figure 36 being a plan view and Figure 37 being a front view. Figure 38 shows a position where the handle is gripped from the front view and the angle between the horizontal surface 45 and the center line of the handle is 25 degrees. This example is characterized by having a twisted blade with a twisted blade plate.
The blade plate has a straight blade 80 on the left edge and a type 2 bent blade 82 on the right edge, and has a twisted shape.
The lower part of the rising portion from the rear part of the left edge is provided with a curved blade 83. The lower part of the rising portion from the rear part of the right edge is also formed with a blade.
By rotating the handle slightly to the left from the position shown in Figure 38, the curved blade 83 at the lower part of the rising part from the rear of the left edge comes into contact with the ground, and the curved blade can be used to scoop up the ground at the base of weeds.
39, the curved blade 83 leaves the ground and the entire straight blade 80 comes into contact with the ground with an inclination to the left, and the straight blade portion of the blade plate is at an appropriate inclination angle to the ground. By swinging the weeder to the left, flat surfaces can be scraped with the straight blade inclined to the weeding direction.
By adding a twist, the angle between the horizontal plane and the handle is kept constant, and the handle can be rotated to the left in two stages from the position shown in Figure 38 while keeping the handle at a comfortable angle, allowing concave cutting and flat cutting to be performed by selecting two types of blades on the edge on the same side.
Compared to Figure 38, in the case of a blade plate shape without twist, in order to weed with a straight blade, the rear part of the handle must be raised until the entire straight blade touches the horizontal plane, and the angle between the horizontal plane and the handle becomes steep, which makes it difficult to operate. If the handle is rotated left while maintaining the angle between the horizontal plane and the handle, the straight blade will be at a steep angle with respect to the horizontal plane.
The twisted blade of this embodiment allows you to select between two types of blades on the left edge by simply rotating the handle, and each blade can be used at the optimal angle between the blade and the ground and the handle, allowing you to cut flat and concave weeds in the same direction, making it very easy to use. The use of the type 2 bent blade on the right edge is the same as that of the weeder in Example 7.

40 to 42 show the weeding tool of Example 9. FIG. 40 is a plan view, FIG. 41 is a front view, and FIG.
1 is an enlarged view of the cross section taken along the line CC. This embodiment is a weeder having a blade plate shape with a shallow spoon placed upside down.
An upside-down spoon without a bottom also works in the same way.
In the drawing, the blade is formed on the lower surface side of the blade plate, but it may be formed on the upper surface side.
In the position shown in Figure 41, the blades on the left and right edges are inclined at the same angle to the horizontal plane and are in contact with it at the same time, so the blade plate does not wobble, and the weeder can be swung from side to side to remove weeds in both directions while keeping the blade plate pressed against the ground.
By swinging the handle from side to side, the blade, which is moderately inclined toward the ground, moves in an arched manner, stroking the ground, allowing two weeding operations in one stroke.
It is possible to cut deeper by increasing the angle of the blade against the ground. By turning the blade over, concave cutting, rotating cutting, and weed removal methods that cut into the ground are possible.
When weeding, tilting the weed cutter to the right when weeding to the left in a plan view and tilting it to the left when weeding to the right will narrow the weeding width but make it easier to weed.
The weeder of Example 4, Fig. 24, has a flat blade, so when cutting in both the left and right directions, the weeding direction is left and right, and the angle of the edge blade to be used relative to the ground must be set for each operation. However, in the weeder of this example, the left and right edge blades are always in contact with the ground at a moderate inclination,
There is no need for this, and the device can be used equally well by either left-handed or right-handed people.
This weeder can use both sides of the blade, and can remove weeds by smoothing, concavely scraping, rotating, and cutting into the ground, as well as by pushing and scraping with the front blade and twisting the handle to remove weeds from hardened ground.

[0033] LIST OF SYMBOLS 1 Blade plate 2 Rising portion 3 Mounting portion 4 Blade body 6 Straight blade 7 Convex-bow shaped blade 8 Front edge blade 11 Handle 12 Front end of handle 13 Rear end of handle 14 Grip portion 16 Curved blade formed at bottom of rising portion and rear portion of convex-bow shaped blade 17 Handle width 18 Handle width center line 19 Blade angle reference line 20 Blade angle of straight blade 21 Straight line perpendicular to the handle width center line drawn at the front end of the handle 22 Intersection of the straight line perpendicular to the handle width center line drawn at the front end of the handle and the handle width center line 23 Tip of blade plate 24 Front end of blade plate 25 Top surface of blade plate 26 Bottom surface of blade plate 27 Rear end of side edge 28 Bottom surface of front end of handle 29 Straight line parallel to the center line of the handle passing through the bottom surface of the grip portion of the handle in the front view 32 Cut-out portion of front part of handle 33 Removal part at rear of handle 36 Center line of handle 37 Thickness of handle 40 Inclination angle of handle 45 Horizontal plane 50 Ground surface 55 Weeding direction 60 Left and right width of blade plate at lower part of rising portion 61 Center of left and right width of blade plate at lower part of rising portion 62 Shift amount of blade plate 67 Rising portion 77 Type 1 bending blade 78 Type 2 bending blade 80 Straight blade 82 Type 2 bending blade 83 Curved blade 100 Convex-bow shaped blade 101 Straight line connecting both ends of convex-bow shaped blade 102 Length of straight line connecting both ends of convex-bow shaped blade 103 Displacement of convex-bow shaped blade 105 Obtuse-angled blade 110 Concave-bow shaped blade 111 Straight line connecting both ends of concave-bow shaped blade 112 Length of straight line connecting both ends of concave-bow shaped blade 113 Displacement of concave-bow shaped blade 125 Rear end of side edge 126 Front end 127 of the blade on the side edge Straight line 128 connecting the rear end of the side edge and the front end of the blade on that side edge Length 129 of the straight line 127 Deviation 135 due to bending of the blade Angle between the horizontal plane and the handle X Weeding direction X1 perpendicular to the handle Weeding width in the weeding direction X Y Weeding direction Y1 parallel to the handle Weeding width in the weeding direction Y Z Weeding direction Z1 perpendicular to the straight blade Weeding width in the weeding direction Z a Weeding direction for cutting up the ground b Weeding direction for stroking and scraping (Explanation of the main points of the claims)

The present invention has a structure in which a blade body consisting of a blade plate, a raised portion, and an attachment portion is attached to the front part of a rod-shaped handle, with the blade plate located immediately before the handle, and the positional relationship between the blade plate and the handle is such that, as described in the explanation of terms, when the blade plate and the handle are in the basic positional relationship, i.e., when viewed from the front in the basic position where the underside of the blade plate is in contact with a horizontal plane, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is located below the underside of the front end of the handle, this is a weed cutter that has been designed with ingenuity in the shape of the blade body and the shape of the handle in mind, which is a common shape for all weed cutters.
Fig. 3 is a front view of a weeder that is a representative shape of the weeder of the present invention, but in all weeders of each claim, the positional relationship between the blade body, which is composed of the blade plate, the body rising portion, and the attachment portion, and the handle is the same as in Fig. 3, with the front end of the blade plate protruding forward of the handle and the rear end of the side edge being located below the underside of the front end of the handle. The shape of the blade plate differs for each weeder.
For any weeder, if the handle is made thinner at the front, both sides of the blade can be used.
The weed-killing tool can use a wide variety of weed-killing methods, can frequently select a different weed-killing method for each weed, is small and lightweight, and can remove weeds quickly. It is easy to use and has features not found in conventional weed-killing tools, as well as the ability to use a variety of weed-killing methods in combination.
The handle, with its thinner front section, contributes greatly to improved functionality.

This weeder of common shape has the same shape for the main parts, i.e., the relative positions of the blade and handle, and the main weeding operation for all weeders is to remove weeds by swinging the weeder from side to side and pushing the handle forward and downward.The common problem with conventional weeders, that is, their slow weeding speed, has been improved by designing the weeder so that the weeding operation can be repeated in short cycles, thereby improving operability.
The shape of the blade surface may be a flat blade shape, a curved blade shape, a twisted blade shape,
There are also ones shaped like an upside-down spoon. By widening the width of the blade to a certain extent, one side edge can be a flat blade and the other side edge can be a curved or twisted blade.
The basic blade shapes are straight, convex, concave, and obtuse.
There are ones that are twisted and ones with a pointed front part of the blade.

This weeder of common shape has the point of force and the point of action adjacent to each other, so the force of the arm can be efficiently transmitted to the blade plate, and it is suitable for gripping the handle adjacent to the blade plate, swinging the weeder back and forth at high speed, and scraping the ground with the blade on the side edge to remove weeds. This shortens the time required for weeding compared to conventional weeders,
Improved efficiency is a common feature of all weeding implements according to the invention.
In the above-mentioned common weeding tools with the blade and handle adjacent to each other, the technique of placing the index finger on the top or side of the tip of the handle or the thumb on the left side of the tip as shown in Figures 8 and 9 brings the point of force and the point of action closer together, facilitating the operation of pressing the blade and pushing the blade in the weeding direction, making the weeding operation easier and allowing for a snappy and smooth weeding, and is an excellent method of use not found in conventional weeding tools. This facilitating operation is not possible with weeding tools with a shape in which the grip part and the blade are not adjacent or with a weeding tool with a high rise part.
By providing blades of multiple shapes, the shortcomings of one blade can be compensated for by blades of other shapes,
A blade having a symmetrical shape has the advantage that it can be used equally by either the left or right hand.
With blades that have the same shape on both the left and right edges, when the blade in regular use becomes dull, the other blade can be used as a spare, so you only need to sharpen the blades when both blades become dull, which can extend the frequency of this sharpening.When weeding by scraping the ground, blade wear is inevitable, so this has the advantage of cutting the frequency of sharpening the blade by almost half.

The weeding tool of the present invention has a simple structure, but by utilizing the synergistic effect of the above-mentioned common shape and the combined blade and handle shapes, it is able to achieve high-speed weeding and a wide variety of weeding methods that were not possible with conventional weeding tools, and can be used frequently and selectively.
The blade is pressed in the same direction as the blade is scraped off, making the weeding operation easier. By providing blades of different shapes on each edge of a single blade plate, there is an advantage that a wider variety of weeding methods can be accommodated without increasing the blade plate area.
In addition to being able to use different blades formed on the left, right and front edges of the blade plate to remove weeds, by adopting a handle with a thinner front part, it is possible to prevent the front part of the handle from interfering with the ground in the weeding position shown in Figure 15, even with a blade with a relatively short blade plate, and it is possible to turn the blade plate over and push the handle to remove weeds, making it possible to use several easy-to-use weeding methods, and one of many weeding methods can be instantly selected and used for each weed.
This common shape weeder is held at a low position close to the ground as shown in Figure 5 by gripping the handle adjacent to the blade, allowing the power of the arm to be efficiently transmitted to the blade, and is suitable for a weeding method in which the ground is repeatedly scraped back and forth in short cycles.

When swinging the weeder back and forth at high speed to scrape the ground, it is essential that the front part of the handle adjacent to the blade be shaped so that it can be gripped at a low position close to the ground; this is a feature common to all present inventions and greatly contributes to high-speed weeding operation and improved operability.
Therefore, the types of weeders with high rising parts as in Patent Documents 5 and 7 have the disadvantage that the grip is positioned high and makes them difficult to operate, and when a load is applied to the blade, the handle rotates and the blade plate tends to tilt in the weeding direction. Furthermore, types in which the blade plate and the grip are not adjacent to each other cannot efficiently transmit the power of the arm to the blade plate, and therefore neither are suitable for high-speed weeding operations that involve scraping the ground in a left-right direction.
In the weeder of the present invention, compared to Patent Documents 5 and 7, the weeding method in which a straight blade that is greatly inclined in the weeding direction is swung back and forth to scrape the ground, and the weeding method in which a bow-shaped blade is swung back and forth and rotated in a bow shape to scrape the ground both reduce the load on the blade, and coupled with the shape of the raised part with a low height, make it more difficult to tilt the blade plate, making it easier to perform continuous high-speed weeding operations.

The handle is thin at the front, and in the front view of the basic position, it is 50 mm below the center line of the handle.
A weeder in which the blade crosses one of the straight lines passing through a section and parallel to the center line of the handle, can be used not only to scrape the ground by swinging it from side to side, but also to push the handle in this position to remove weeds, since interference between the front of the handle and the ground can be avoided even with a blade that is relatively short, in a weeding position similar to that shown in Figure 15 with the blade turned upside down. A handle with a thin rear part makes this weeding operation even easier.
In the weeding posture of Figure 5, the handle is inclined relative to the ground, so the height of the rising part is relatively low at about 15 mm, which prevents interference between the fingers gripping the handle and the ground and allows the handle to be held at a low position close to the ground, allowing weeding with good pressure from the blade plate.
The weeding tool of the present invention has a shape that allows the handle to be held at a low position close to the ground and to be used for weeding with the handle inclined relative to the ground, and by providing a handle with a thinner front portion, both sides of the blade plate can be used. Combined with the handle with a thinner rear portion, this provides significantly improved functionality and operability compared to weeding tools that weed with the handle held in a position that is roughly parallel to the ground.
The weeding method of removing weeds by turning the blade upside down is a frequently used method, and the most distinctive feature of the weeding tool of the present invention is that it makes it possible to use this weeding method, greatly improving the ease of use of the weeding tool.

Each claim, by incorporating the content thereof, makes it possible to do things that were not possible with conventional weed-killing tools, or makes weed-killing operations easier.
The gist of each claim will be explained below. The numbers in brackets correspond to the claim numbers.
Claims 9 to 15 relate to weeders equipped with a blade of a unique shape not found in conventional weeding tools, or equipped with either a straight blade with a blade angle of 25 degrees to 85 degrees, a convex bow shaped blade, or a concave bow shaped blade, and the blade plate is shifted to correct the left and right balance of the blade plate to improve the ease of weeding the ground, and all of the claims exclude the condition of being equipped with a handle with a thin front part.
According to the nineteenth aspect of the present invention, the shape of the rear part of the handle is improved to improve the operability of the weeding operation by pushing the handle with the blade plate in an upside-down position.
[1]

The weeding tool described in claim 1 is equipped with a handle with a thin front portion, and therefore in addition to using the blades on the left and right side edges of the blade plate to swing the weeding tool from side to side and to push the handle forward and downward, if the blade plate is inclined relative to the center line of the handle when viewed from the front, even with a relatively short blade plate, it is possible to turn the blade plate over and push the handle forward and downward to remove weeds, enabling several easy-to-use weeding methods that are not available with conventional weeding tools.
In the weeding positions shown in Figs. 6 and 12, where the upper surface of the blade plate faces upward, the weeder is swung from side to side, and in the weeding position shown in Fig. 14, the handle is pushed to scrape the ground, and the lower surface of the blade plate faces upward.
5. In the weeding posture of Fig. 18, the front part of the handle is prevented from interfering with the ground, and the ground is scraped by pushing the handle, making it possible to use an easy-to-use weeding method. In any weeding posture, the center line of the handle is at a moderate angle to the ground, so weeding can be done with almost no bending of the wrist, and arm fatigue is reduced even during long periods of weeding work, resulting in a shape that is easy to use and easy to operate.
Although the shape of each blade is not particularly distinctive, the provision of two types of blades, a straight blade and a convex-bow blade, in the above-mentioned common-shaped weeder with a handle with a thin front portion enables the various weeding methods described in the explanation of the weeder in Example 1, and although the shape is simple, it can incorporate many functions for weeding small weeds. Among them, the weeding method of scraping off weeds by turning the blade plate over as shown in Figure 15, the weeding method of scraping off weeds in the Y direction as shown in Figure 10, and the weeding method of pushing the handle in the b direction slightly forward from the front end direction of the blade plate while holding the blade plate at an angle of about 60 degrees to the ground in the weeding position as shown in Figure 18 are features not found in conventional weeders and are very easy to use,
It is used frequently.
Since the blade plate is located just before the handle, it is possible to bring the point of force even closer to the blade plate, making it easier to perform the operations of pressing the top of the handle with the index finger to press the blade plate against the ground (Figure 8), placing the index finger on the right side of the front end of the handle and pushing the blade plate to the left (Figure 9), and pushing the blade plate to the right by placing the thumb on the left side of the front end of the handle.
Using these techniques reduces the burden on the worker and makes it easier to remove weeds, and the difference in feel is clearly noticeable.

The weed remover in FIG. 1 having a handle with a thin front portion has a simple shape, but is capable of performing about 10 types of weed removal methods as described in the explanation of the method of using the weed remover in Example 1, and allows the user to instantly select the weed removal method most suitable for the weed to be removed and frequently use a variety of weed removal methods.
In ground with a high weed density, a straight blade is used to remove multiple weeds at the same time, and in ground where the weeds are somewhat widely spaced apart, a convex-bow shaped blade is used to remove each weed one by one by pushing, concave and rotating, thereby reducing the amount of ground that is removed beyond the required width.
By locating the blade just before the handle and holding the handle adjacent to the blade at a low position close to the ground, the blade can be held down effectively and the weeder can be swung from side to side for high speed weeding.
Among them, the one in Example 3, which has the shape shown in Figure 23, is light in weight and is ideal for high-speed weeding by swinging it from side to side. Since the blade width is narrow, it is also suitable for weeding in tight spaces, and has the advantage that soil does not easily adhere to the blade when weeding on damp ground.
The linear blade inclined in the weeding direction allows the weeding direction to be selected as shown in Figure 10, and the weeding width to be changed as shown in Figure 11, allowing the weeding width to be adjusted to the maximum for ground that is easy to cut and the minimum for ground that is difficult to cut, making it possible to deal with difficult ground and weeds that are difficult to cut. The weeding operation in the Y direction in Figure 10 and the weeding method of pushing the handle in the b direction in Figure 18 allow weeds to be easily cut off, are very easy to use, and are features not found in other weeding tools.
[2]

This weeding tool has a blade plate with flat side edges and curved blades on both the left and right side edges. The curved blades on the side edges can be used for multiple purposes, as explained in the method of using the weeding tool in Example 1.
A blade with a convex bow shape with a small deviation ratio on one side edge and a convex bow shape with a large deviation ratio on the other side edge allows the blade with the small deviation ratio to perform flat shaving just like a straight blade, and can cut off multiple weeds at the same time using the entire blade width. A convex bow shape with a large deviation ratio allows for a variety of weeding methods to remove single weeds.
In other words, by providing convex bow-shaped blades with different deviation ratios on the left and right edges, it is possible to achieve the same function as a weeder that has a convex bow-shaped blade on one edge and a straight blade on the other edge.
It is also possible to provide a blade having a convex bow shape with the arc of the bow portion differing in size on the same side edge, thereby making it possible to perform both flat surface cutting and concave surface cutting.
The blades with the convex arch shape on the side edges are symmetrical, so that the right and left edges can be used under the same conditions.
It can be used by either the left or right handed person. In addition, when one blade becomes dull due to wear, the other blade can be used as a spare blade.

The deviation, deviation ratio, blade angle, and blade section angle of the convex bow shaped blade can be formed in various ways, and there are many types of overall blade plate shapes when these are combined.
Depending on the shape of the front portions of the arched blades formed on the left and right side edges, the front end or tip of the blade plate can be either pointed or arched.
Those with a sharp blade at the front can weed hardened or gravelly ground by pressing the sharp blade against the weed and twisting the handle, and can also be used to dig up the roots by inserting the blade into the base of the weed. Those with a wide blade can be used to cut roots by pushing and scraping, or by using body weight.
Blades with a bow-shaped front end can be used for push-cutting, or for weeding by pressing the blade against the base of the weed and rotating the handle left and right. When push-cutting, the ground can be scraped into a concave, recessed shape.
The handle, with a thinner front section, makes it possible to remove weeds by turning the blade over, greatly improving operability.
[3]

This claim is a weeder with a convex bow-shaped blade on one side and a concave bow-shaped blade with a deviation ratio of 20% or less on the other side. A weeder with a concave bow-shaped blade with a small deviation ratio can scrape flat surfaces in the same way as a straight blade.
The operation of cutting off weeds by placing the concave blade in close contact with the ground and swinging the weeder back and forth creates a smooth cutting motion in which the concave blade moves while rotating in a convex shape, making it suitable for cutting off a very thin layer of weeds densely grown on the ground. The convex blade on the other edge can be used for multiple purposes.
The handle, with a thinner front section, makes it possible to remove weeds by turning the blade over, greatly improving operability.
[4]

The blunt-angled blade on the side edge is in a weeding position with the top surface of the blade plate facing upwards, and one of the two blades that make up the blunt-angled blade can be used to scrape flat surfaces and scoop up the ground at the base of weeds with the blunt-angled blade.By pressing the blunt-angled blade against the weed and rotating the handle, it is possible to scrape off rooted weeds by rotating the blade.This makes it a versatile blade.
By adopting a handle with a thin front part, it is possible to perform a weeding method that breaks up the ground similar to the operation of weeding in the direction a in Figure 18 by turning the blade upside down, and an operation to weed in the direction b by narrowing the weeding width and easily cutting off weeds.
Of the two blades that make up the obtuse-angled blade on the side edge, the angle of the straight blade located at the front is 1
Those equipped with a blade angle of 20 degrees or more can use the front and back of the blade plate for push-cutting.
The individual blades that make up the obtuse-angled blade are either straight blades or convex-bow-shaped blades with small deviations.
It is possible to use it alone, or multiple obtuse-angled blades can be formed on the same side edge.
The blade with a pointed front where it intersects with the blade formed on the other side can be used to dig up weeds by inserting it into the base of the weeds, or by pressing the tip against the blade and twisting the handle, it can be used to weed hardened ground or ground mixed with pebbles by using the front and back of the blade.
If an obtuse-angled blade, straight blade, convex-bow shaped blade, concave-bow shaped blade, or type 2 curved blade is provided on the other side edge, the options for weeding methods will increase further. By frequently using the blades on the left and right edges and the blade at the front of the blade plate, it can be used for a variety of weeding methods, including flat cutting and removing individual weeds.
A blade having a plurality of obtuse-angled blades on the same side edge has the advantage that there is greater freedom in the shape of the edge, and there is also greater freedom in the blade angle of each of the linear blades that make up the obtuse-angled blade.
The handle, with a thinner front part, makes it possible to remove weeds by turning the blade over, and by using the front edge blade or the other side edge blade in combination, it greatly contributes to improved operability.
[5]

The weeder in FIG. 1 has a straight blade on one of the left and right edges and a convex bow-shaped blade on the other edge.
Or, when weeding by swinging it to the right, the weeding direction is reversed depending on the blade used, so the ease of weeding is slightly different between the left and right directions. If a convex bow blade and a straight blade are installed side by side on the same side edge, two types of blades can be used in the same easy-to-use weeding direction.
In the case of FIG. 24, both the left and right edges are provided with both a convex arcuate blade and a straight blade.
The advantage is that the convex bow blade and the straight blade can be used in the same weeding direction regardless of whether the user is left-handed or right-handed.
The leading edge of the blade can be used for pushing and weeding on hard or gravelly ground, and for using body weight to weed.
The weeder in Figure 24 has a symmetrical shape, with a convex arched blade in the center of the side edge, a straight blade at the front edge, and a straight blade at the rear edge on each side edge, so that when the blade on the edge that is usually used becomes dull, the blade on the other edge can be used as a spare blade. The blunt blade on the front edge can be used for weeding using body weight, or for weeding hard ground or removing weeds with stubborn roots by pressing the tip of the blade plate against it and twisting the handle. It is also possible to use a weeding method in which the blade plate is turned over and the straight blades on the front edge are used to push and cut the weeds. The left and right edges can also be asymmetrical.
The handle, with a thinner front section, makes it possible to remove weeds by turning the blade over, greatly improving operability.
[6]

This weeding tool has straight blades on the left and right side edges and a convex bow-shaped blade on the front edge of the blade plate.
Convex arch-shaped blades include blades with many different arch-shaped protrusions, ranging from those with a shape close to a straight blade with a small deviation ratio, to semicircular blades with a large deviation ratio.
The straight blades include convex bow blades with a deviation ratio of less than 5%, concave bow blades, and
Since obtuse-angled blades are also included, in addition to the function of a straight blade, it also includes the function of a blade that is slightly bowed, protruding at an obtuse angle, or concave.
The angle of the straight edge of the side edge can be any angle within the range of 25 degrees to 160 degrees.
The blade plate shape can be a fan shape, a rectangular shape, a shape close to a trapezoid, or an asymmetrical shape.
The straight blade on the side edge of the blade plate is mainly used for flat surface cutting, and by swinging it from side to side, the entire blade length can be used to cut off multiple weeds at the same time, making it possible to repeat the weeding operation in short cycles.
The straight blades on the left and right edges can cut flat surfaces in both directions, and the blade plate shape is symmetrical.
It can be used in the same way by either left or right handed people. When one straight blade becomes dull, the other straight blade can be used as a spare blade.
The one equipped with a straight blade with different blade angles at the left and right edges can change the weeding width depending on whether the weeding direction is leftward or rightward, and a blade with an angle that provides a wide weeding width can be selected for ground that is easy to weed and a blade with an angle that provides a narrow weeding width can be selected for ground that is difficult to weed.

As shown in Figure 5, the handle can be held low near the ground, and by gripping the handle adjacent to the blade, the blade can be held down effectively and the blade is less likely to wobble. The weeder can then be swung left or right.
It is possible to perform flat surface cutting at high speed.
The linear blade inclined in the weeding direction can be operated to change the weeding width by selecting the weeding direction as shown in Figures 10 and 11, and can weed ground of various hardness by weeding ground that is easy to weed with the maximum width and ground that is difficult to weed with the minimum width.

The convex arch shaped blade provided on the front edge of the blade plate may be either symmetrical or asymmetrical in plan view.
The length of the straight blades on the left and right edges can be changed so that the convex bow-shaped blade on the front edge is inclined diagonally forward. In this shape, as shown in Figure 3, the center line of the handle is inclined relative to the blade plate, and the handle is made thinner at the front. By turning the blade plate over and pushing the handle, it is possible to push and shave, break up the ground, and smooth the ground.
The convex bow-shaped blade on the front edge can be used to remove weeds by turning the blade plate over as shown in Figure 15, and the ground can be scraped into a concave or concave shape by pushing and scraping, and both sides of the blade plate can be used to easily scrape off single weeds, and by turning the blade plate over and pushing and scraping while twisting the handle, the ground on the front side of the blade plate can be scraped continuously even on somewhat hard ground.
The blade plate with a fan-shaped shape makes it easy to press the convex bow-shaped blade at the front edge and rotate the handle left and right multiple times, allowing the blade plate to penetrate widely for weeding. Since the straight blades on both the left and right side edges of the fan-shaped blade plate are both inclined in the weeding direction, either the left or right straight blade can be used for weeding.
As shown in Figures 10 and 11, the weeding direction can be selected to change the weeding width.
When removing multiple weeds at the same time, the straight blade can be moved left or right, or removed diagonally backward, or the handle can be pulled towards you and removed backward. When removing weeds one by one, the front and back of the convex bow-shaped blade can be used to push and remove them, allowing the straight blade and convex bow-shaped blade to be used interchangeably frequently for weed removal work.

A blade cutter with a fan-shaped blade in which a straight blade on the side edge and a convex-bow-shaped blade on the front edge intersect at an acute angle can cut off rooted weeds by inserting the acute-angled blade into the base of the weed and rotating the handle.
A fan-shaped or similarly shaped blade having an obtuse angle between the convex-arch shaped blade at the front edge and the straight blade at the side edge can be used to scoop up the ground at the base of weeds.

The blade plate has a convex bow-shaped leading edge with a small deviation ratio, a left-right width of about 30 mm, a leading edge and a side edge intersecting at an angle of about 85 degrees, and a blade plate length of about 50 mm.
The narrow blade width makes it light in weight, and the front edge blade is suitable for push-cutting, whereby weeds are cut off one by one by using both the front and back of the blade plate. Because the blade plate is narrow from side to side, the straight blades on the left and right edges can be used by rotating the handle slightly left and right and tilting the left and right edge blades alternately to the ground at an appropriate angle, allowing for alternating cutting operations in the left and right directions.
The handle, with a thinner front section, makes it possible to remove weeds by turning the blade over, greatly improving operability.
[7]

The blade has straight blades on the left and right side edges, and two straight blades on the front edge, with the angle of the apex being 8.
A weeder with a blade that has two sides of a triangle with an angle of 0 degrees or more and less than 180 degrees and a similar shape. A blade with an angle at the apex that is extremely close to 180 degrees is equivalent to a straight blade.
That is, in a weeding tool having a pentagonal blade with the angle of the apex extremely close to 180 degrees, the blade shape is an inverted trapezoid, a square, or a trapezoid.
For those with a straight blade on the side edge with a blade angle of less than 90 degrees, the weeding width can be selected as shown in Figures 10 and 11 and the weeding operation can be performed.
Blades with a apex angle of 80 degrees or more and less than 120 degrees can be used to weed hardened ground or ground mixed with pebbles, dig up weeds, and cut roots using body weight by pressing the front end against the blade and twisting the handle, while blades with a apex angle of 120 degrees or more can be used to push the ground around weeds in a shallow V-shape with the blade at the apex, and the individual straight blades on the front edge that make up a blade of this shape can be used to push and cut by using the front and back of the blade plate appropriately.
Blades with a trapezoidal or rectangular shape can be used for applications where the front and back of the blade are used for pushing and scraping with the front edge blade, or for applications where the left and right ends of the front edge and the straight front parts of the side edges are used together to scoop up the ground at the base of weeds with a blade shaped like two sides of a triangle. Blades with a narrow front edge blade can be used for applications where weeds are scraped off one by one by pushing and scraping, or for applications where the blade is inserted into the base of a weed and dug it up.
The straight blade on the side edge behind the front edge is for flat surface cutting. Blade angles of less than 90 degrees are
By selecting the weeding direction as shown in Figures 10 and 11 and changing the weeding width, it is possible to deal with ground that is difficult to cut.
The handle, with a thinner front section, makes it possible to remove weeds by turning the blade over, greatly improving operability.
[8]

This weeder has straight blades on the left and right side edges and a straight blade on the front edge. The blade shape is square.
They are available in trapezoid, inverted trapezoid, and parallelogram shapes. The straight blade with a narrow cutting edge at the front edge is suitable for pushing weeds one by one, and can also be used to dig up weeds by inserting the blade into the base of the weed. The straight blade with a wide cutting edge at the front edge can push and remove multiple weeds at the same time.
When the blade shape is close to a parallelogram, one of the straight edges on the side is inclined in the weeding direction. When the tip of the blade plate is thin and sharp with an acute angle, the left and right balance of the blade plate becomes poor, but by shifting the blade plate, the left and right balance can be corrected, and this shape of blade has the advantage of being easy to use for weeding in narrow spaces.
The handle, with a thinner front section, makes it possible to remove weeds by turning the blade over, greatly improving operability.
[9]

When the weeder shown in Figures 25 to 27 is used to press the underside of the blade against the ground and scrape the ground to the left, the blade does not wobble, the ground against which the underside of the blade is in contact is used as the reference plane, the approach angle of the straight blade bent diagonally downward is fixed, and the straight blade can maintain a shallow approach angle relative to the surface to be scraped, making it easy to scrape a thin layer of ground and easy to scrape off a large number of small weeds with heights ranging from a few mm to about 40 mm. It is also possible to change the weeding width as shown in Figures 10 and 11.
A weeder with a straight blade of this shape is easy to use for thinly scraping the ground, and if the blade plate is tilted moderately without being in close contact with the ground, it can also scrape a little deeper, and can be used in the same way as a straight blade formed on the side edge of a flat blade plate. By using the blade formed on the other side edge in combination, multiple blade shapes can be used frequently to remove weeds.
[10]

This weeding tool is characterized in that the side edge of the blade plate is provided with a linear blade inclined in the weeding direction with a blade angle of 25 degrees or more and 85 degrees or less, and the blade plate is shifted by 2 mm or more.
To provide a weed cutter having a blade plate with a straight blade inclined in the weeding direction on one side edge and an asymmetric blade on the other side edge, the blade plate may become unbalanced from side to side, but the balance can be corrected by shifting the blade plate.
Providing a straight blade inclined in the weeding direction on the side edge has the advantage that even if the blade plate has a narrow width at the front part, it is easy to arrange a convex bow-shaped blade on the front edge.
Compared to a weeder equipped with a straight blade with a blade angle of approximately 90 degrees on the side edge, a convex bow-shaped blade can be formed on the front edge even if the area of the blade plate is small, which leads to a reduction in the weight of the blade plate.
Those with a convex-bow shaped blade on the front edge can easily make shallow concave or concave scrapes by pushing the handle forward and downward, and can perform repetitive operations 2 to 3 times per second, making them suitable for scraping off weeds one by one.
In weeders where the blade is located just before the handle and the front part of the handle is gripped and swung left and right to scrape the ground with the blade on the side edge, the operation of swinging the linear blade inclined in the weeding direction left and right necessarily results in the blade being placed at an angle against the weeds and scraping them off without the operator being aware of it when viewed from above.
Compared to cutting perpendicular to the weeds, this has the advantage that the cutting width is narrower but it is easier to cut.
Conventional weed cutters that cut weeds along with the ground cut in a direction that is nearly perpendicular to the blade, whereas this claim requires that by swinging the weed cutter from side to side, the weed cutter will necessarily cut in a direction that is not perpendicular to the blade, but it is also possible to cut in a perpendicular direction.
Depending on the difficulty of weeding, such as the hardness of the ground or the stubbornness of the weed roots, the weeding direction closer to the Y direction in Figures 10 and 11 can be selected, which has the advantage of narrowing the weeding width. Weeding in the Y direction requires less force than weeding in the perpendicular direction, which reduces arm fatigue when weeding a relatively large area of ground.

As an example of using the weeding tool in the Y direction, when weeding a ground several meters wide from side to side using the weeding tool in Figure 1, the weeding width in the front and back directions is set to about 30 cm, and the weeding operation in the Y direction in Figure 11 is performed continuously using a rake. This weeding pattern, which moves sideways while weeding, reduces arm fatigue and makes weeding easier. By repeating this weeding pattern, it is possible to weed a relatively large area, making it suitable for weeding in parks, etc.
In soft ground such as fields where it is difficult to remove weeds, the slender blade shown in Figure 23 is suitable, and an effective technique is to use the approximately 15 mm part at the tip of the straight blade to hook and scoop up the weeds, and a straight blade inclined in the direction of weed removal is optimal.
A straight blade with a blade angle of 30 degrees has the same effect as weeding in the Y direction in Figure 10, when swinging the weeder back and forth to scrape the ground with the side edge blade, i.e., pulling the blade toward you with a blade angle of 150 degrees to the weeding direction. This makes it possible to scrape the ground with ease, and has the advantage that the weeding operation can be repeated quickly compared to pulling the handle toward you to scrape the ground.
In a weeding method in which a weeder is swung from side to side to scrape the ground, a straight blade inclined to the weeding direction has the effect of preventing the blade plate from wobbling against the ground and preventing the blade from penetrating too deeply, as compared with a straight blade with a blade angle of 90 degrees to a blade angle reference line, and has the advantage of being easier to scrape although the weeding width is narrower.
As the difference in the blade angle from 90 degrees increases, the weeding width becomes narrower when swinging the blade left and right to scrape the ground, but it becomes easier to scrape, and when a load is applied to the blade, the blade plate is less likely to tilt, and the effect of suppressing the blade from penetrating too deeply increases. The weeding width is narrow, but the function of the straight blade is improved to make it easier to scrape.
[11]

Instead of the straight blade of the weeding tool according to claim 10, the angle of the blade is 25 degrees or more and 85 degrees or less,
This weed cutter is equipped with a convex bow-shaped blade with a deviation ratio of less than 10% and the blade plate is shifted by 2 mm or more.
A convex-arc shaped blade with a small deviation ratio is functionally nearly equivalent to a straight blade.
[12]

Instead of the straight blade of the weeding tool according to claim 10, the angle of the blade is 25 degrees or more and 85 degrees or less,
This weed cutter is equipped with a concave bow-shaped blade with a deviation ratio of less than 10% and the blade plate is shifted by 2 mm or more.
A concave arcuate blade with a small deviation ratio is functionally nearly equivalent to a straight blade.
[13]

As shown in Figure 32, the type 1 bending blade has a bow-shaped blade 77 that is moderately inclined relative to the ground and the entire blade contacts the ground in a concave bow shape, so the blade plate is less likely to wobble than a straight blade, and has the advantage that it is easier to maintain the blade plate at a constant angle relative to the ground.
When the weeder is swung in the direction of the arrow in the position shown in Figure 32, the blade that contacts the ground in a concave bow shape rotates in a convex bow shape at a moderate angle to the ground, stroking it to remove weeds, which has the advantage of being easier to remove than a straight blade when scraping a flat surface. Since the entire blade width is used to remove weeds, it is suitable for removing multiple weeds at the same time.
The weeding tools shown in Figures 30 to 32 are equipped with both a Type 1 bending blade suitable for simultaneously cutting off multiple weeds, as described in the explanation of Example 7, and a Type 2 bending blade with multiple functions suitable for removing a single weed, and can be used frequently to perform efficient weeding work.
[14]

The twisted blade with a twisted side edge has an advantage that the blades of a plurality of shapes formed on the edge of the twisted side edge in the section from the lower part of the rising part to the tip of the side edge can be selected and used at an optimum handle angle for easy operation without changing the angle between the ground and the handle, by simply rotating the handle.
The blade on the left edge of Figure 37 is an example of a twisted blade, and this weeder can select the straight blade on the left edge and the type 2 bent blade by rotating the handle while keeping the handle at the optimal angle without changing the angle between the center line of the handle and the ground, and can shave flat or concave in the same weeding direction. The type 2 bent blade on the right edge has a larger bent diameter, and can be used for multiple purposes like the type 2 bent blade in Example 7.
Compared to using separate blades on the left and right edges to weed, the twist blade has the advantage that multiple blades on the same side edge can be selected and used simply by rotating the handle, with the same easy-to-operate weeding direction, the same angle between the handle and the ground, and a moderate angle between the blade and the ground, making it extremely easy to use.
[15]

The blade plate is shaped like an upside-down spoon, with the blades on both sides inclined to the horizontal plane and in contact with it at the same time, so you can scrape the ground in both directions while pressing the blade plate against the ground.
Two weeding operations are possible with a round trip, making for efficient weeding work. This type of weeder can be used to weed by using the front and back sides of the blade plate. Figures 40 to 42 show this embodiment, which can be used for multiple purposes. In the position shown in Figure 41, the blade can be swung left and right to scrape the ground with the side edge blade to remove weeds.
It can be used to push the blade downwards to cut weeds with the front edge of the blade, or to press the front edge of the blade against the weed and twist the handle, and when the blade is turned upside down, it can be used for concave cutting, rotating cutting, and weeding by cutting into the ground. Blades with a pointed front make it easier to press the front of the blade against the base of a weed and twist the handle to remove it, and are suitable for weeding on hard ground or ground with pebbles. The left and right edges can also be asymmetrical.
[16]

By providing a blade having a convex bow shape, various types of weeding methods using a blade of this shape, as described in the explanation of the weeding tool in Example 1, are possible.
[17]

The type 2 bending blade may be formed over the entire side edge of one side, or a small type 2 bending blade may be provided by bending only a portion of the side edge of the flat blade.
By providing the Type 2 bending blade, it becomes easier to cut the ground around the weeds into a concave shape. The type 2 bending blade on the entire side edge allows for several types of weed removal methods, as described in the explanation of Example 7.
[18]

By shifting the blade plate, the left-right balance of the blade plate can be corrected, making it easier to press the entire blade area of the left or right edge against the ground, improving operability. Even in blades with significantly different left and right side edge shapes, the weight balance of the left and right blade plates can be corrected by shifting, which has the advantage of increasing the degree of freedom in the left and right side edge shapes.
[19]

The handle with a thinner rear section is used for the weeding method in which the blade is turned upside down and pushed against the handle.
The corners of the rear part of the handle do not come into contact with the palm of the hand, and the rear part of the handle fits snugly against the palm of the hand when the hand grips the rear part of the handle in a manner that wraps around it, making it easy to grip, and there is no slippage, which can remarkably improve the operability of pushing the handle to remove weeds.
[20]

This claim provides the following three advantages. In the drawings of each embodiment, the blade is attached to the front underside of the handle parallel to the center line of the handle, with the blade attached at an angle to the blade plate.
Similar to the shape 32 of the cut-out portion of the front upper surface of the handle in Figure 3, a handle with a cut-out shape of the front underside of the handle can be used, and the blade body shape is such that the blade plate is parallel to the attachment portion of the blade, and the blade is attached to the cut-out underside of the front of the handle, so that the blade plate can be inclined with respect to the center line of the handle, thereby achieving the same effect.
The first effect is that when the weeder is swung from side to side to scrape the ground to remove weeds, the weeding operation can be performed with the center line of the handle inclined to the ground, so that even with a weeder with a low rising part of the blade, interference between the fingers gripping the handle and the ground can be avoided when weeding by gripping the front end of the handle as shown in Figure 5 or Figures 8 and 9. Since it is possible to grip the handle at a low position close to the ground, the point of force is close to the blade plate, and weeding can be performed with the blade plate held down effectively and with the blade plate less likely to wobble. Weeding can be performed with almost no bending of the wrist, which has the advantage of reducing arm fatigue when working for long periods of time.
The second effect is that in the weeding position shown in Figure 15 where the blade is turned over to remove weeds, the front edge of the blade is at a moderate angle to the ground. Therefore, even with a blade of a relatively short and easy-to-use size, this, combined with the adoption of a handle with a thin front part, makes it possible to scrape away the ground by pushing, as described below, and makes it easy to press the front end of the blade against the base of a weed and twist the handle on hard ground.
This weeding method, in which the blade is turned over and pushed to remove the weeds together with the ground, is a characteristic of the weeder of the present invention, in which the blade is pressed against the ground and moved simultaneously by simply pushing the handle in a straight line, and the angle of the center line of the handle to the ground and the angle of the front blade of the blade to the ground are balanced, allowing the ground to be removed to a nearly constant depth, and it is possible to weed about three times per second, making it very easy to use and allowing weeds to be removed smoothly.
A nearly parallel weed cutter has a tendency for the blade to go straight deep into the ground, making it unsuitable for this weed removal method.
The third effect is that in the weeding method of digging up weeds (Fig. 20 and Fig. 21), the angle at which the blade enters the ground can be selected by using the front and back of the blade plate with almost the same handle angle relative to the ground. Therefore, without having to greatly change the handle angle relative to the ground, it is possible to select the angle of the blade plate entering the ground within the range of handle angles that are easy to operate.
By using the front and back of the blade, the angle at which the blade penetrates the ground can be selected.

Claims (20)

The thickness between the upper and lower surfaces of the handle is equal to or greater than the thickness of the handle (37) for a length of 15 mm or more from the front end of the handle.
The handle (11) is thinner than the handle (37) and has a thickness at the front end of the handle (11) of 80% or less of the handle thickness (37).
The blade body (4) is composed of a blade plate (1), a rising portion (2), and an attachment portion (3) and is attached to the front of the handle, and the blade plate is located just before the handle. The left and right side edges of the blade plate are flat. When viewed from the front in a position where the projected area of the blade plate onto a horizontal plane is maximized from a light source directly above the blade plate, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is located below the underside of the front end of the handle. The overall length of the blade plate is 150 mm.
1. A weeding tool having a blade width of 1.0 mm or less, characterized in that one side edge of the blade plate has a straight blade and the other side edge has a convex bow-shaped blade. 2. A weeding tool according to claim 1, further comprising a convex-arc shaped blade instead of the straight blade. 2. A weeding tool according to claim 1, further comprising a concave arch blade having a deviation ratio of 20% or less, instead of the straight blade. The thickness between the upper and lower surfaces of the handle is equal to or greater than the thickness of the handle (37) for a length of 15 mm or more from the front end of the handle.
and a rod-shaped handle (11) having a thickness at the front end of 80% or less of the handle thickness (37);
A weeder having a blade body composed of a blade plate, a raised portion, and an attachment portion attached to the front of a handle with the blade plate located immediately in front of the handle, with blades on the left and right side edges of the blade plate, with the front end of the blade plate protruding forward of the handle and the rear end of the blade plate located below the underside of the front end of the handle when viewed from the front in a position in which the projection area of the blade plate onto the horizontal plane is maximum from a light source directly above the blade plate, and with a total length of the blade plate being 150 mm or less, characterized in that the side edges of the blade plate have edges with obtuse-angled blades. The thickness between the upper and lower surfaces of the handle is equal to or greater than the thickness of the handle (37) for a length of 15 mm or more from the front end of the handle.
and a rod-shaped handle (11) having a thickness at the front end of 80% or less of the handle thickness (37);
A weeder with a blade body consisting of a blade plate, a rising portion, and an attachment portion attached to the front of a handle, with the blade plate located immediately before the handle, with the front end of the blade plate protruding forward of the handle and the rear end of the blade plate located below the underside of the front end of the handle when viewed from the front in a position in which the projection area of the blade plate onto a horizontal plane is at its maximum from a light source directly above the blade plate, and with a total length of the blade plate of 150 mm or less,
A weeding tool having an edge that includes both a straight blade and a convex arcuate blade. The thickness between the upper and lower surfaces of the handle is equal to or greater than the thickness of the handle (37) for a length of 15 mm or more from the front end of the handle.
and a rod-shaped handle (11) having a thickness at the front end of 80% or less of the handle thickness (37);
A weed cutter having a blade body composed of a blade plate, a raised portion, and an attachment portion, attached to the front of a handle with the blade plate located immediately before the handle, with the front end of the blade plate protruding forward of the handle and the rear end of the blade plate located below the underside of the front end of the handle when viewed from the front in a position in which the projection area of the blade plate onto the horizontal plane is maximum from a light source directly above the blade plate, and with a total length of the blade plate being 150 mm or less, characterized in that the blade plate has straight blades on both left and right side edges and a convex bow-shaped blade on the front edge. In the weeding tool according to claim 6, the angle of the apex portion is 8.
This weeding tool is characterized by having a blade having a shape similar to two sides of a triangle, the shape of which is within an angle of 0 degrees or more and less than 180 degrees. 7. A weeder according to claim 6, further comprising a straight blade instead of the convex-arc shaped blade at the front edge. A weeder equipped with a blade plate having a total length of 150 mm or less, in which a blade body consisting of a blade plate, a rising portion, and an attachment portion is attached to the front of a rod-shaped handle (11) and the blade plate is located immediately before the handle, and in which, when viewed from the front in a position in which the projected area of the blade plate onto a horizontal plane is maximized from a light source directly above the blade plate, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is located below the bottom surface of the front end of the handle,
This weeding tool is characterized in that it is provided with a blade plate having a shape in which the side edge of one of the straight blades of the blade plate is bent obliquely downward relative to the blade plate. In a weeder having a blade plate with a total length of 150 mm or less, a blade body consisting of a blade plate, a rising portion, and an attachment portion is attached to the front of a rod-shaped handle (11), the blade plate is located immediately before the handle, and when viewed from the front in a position where the projection area of the blade plate onto the horizontal plane is maximum from a light source directly above the blade plate, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is located below the underside of the front end of the handle, the blade angle (20) of the side edge of the blade plate is set to a value that is greater than the blade angle reference line (19) in a plan view in the basic position.
A weeder having a straight blade in the range of 25 degrees to 85 degrees, and a shift amount of the blade plate of 2 mm or more. The weeding tool according to claim 10, further comprising a convex-bow shaped blade, instead of the straight blade, in which the deviation ratio of the side edge is less than 10% and the blade angle is within the range of 25 degrees to 85 degrees with respect to the blade angle reference line (19), and the shift amount of the blade plate is 2 mm or more. The weeding tool according to claim 10, further comprising a concave-bow-shaped blade, instead of the straight blade, in which the deviation ratio of the side edge is less than 10% and the blade angle is within the range of 25 degrees to 85 degrees with respect to the blade angle reference line (19), and the shift amount of the blade plate is 2 mm or more. A weeder equipped with a blade plate having a total length of 150 mm or less, in which a blade body consisting of a blade plate, a rising portion, and an attachment portion is attached to the front part of a rod-shaped handle (11) with the blade plate located immediately before the handle, and in which, when viewed from the front in a position in which the projection area of the blade plate onto the horizontal plane is maximized from a light source directly above the blade plate, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is located below the underside of the front end of the handle, characterized in that the side edge of the blade plate has a type 1 bent blade. This weeding tool has a blade body consisting of a blade plate, a rising portion, and an attachment portion attached to the front of a rod-shaped handle (11), with the blade plate located immediately before the handle, and when viewed from the front in a position in which the projection area of the blade plate onto the horizontal plane is maximized from a light source directly above the blade plate, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is located below the underside of the front end of the handle, and has a blade plate with a total length of 150 mm or less, characterized in that it has a twisted blade with the side edge of the blade plate twisted. This weeding tool is equipped with a blade plate having a total length of 150 mm or less, in which a blade body consisting of a blade plate, a rising portion, and an attachment portion is attached to the front part of a rod-shaped handle (11), the blade plate is positioned immediately before the handle, and when viewed from the front with the left and right side edges of the blade plate in contact with a horizontal surface, the front end of the blade plate protrudes forward of the handle and the rear end of the blade plate is positioned below the underside of the front end of the handle, and the blade plate has a blade plate shaped like an upside-down spoon. A weeder according to any one of claims 4 and 9 to 14, further comprising a convex-bow shaped blade attached to the other side edge. The weeding tool according to any one of claims 1 to 14, further comprising a type 2 bending blade attached to a side edge. In the weeding tool according to any one of claims 1 to 9 and claims 13 to 15,
A weeder in which the shift amount of the blade is 2 mm or more. A weed remover according to any one of claims 1 to 15, characterized in that the thickness of the rear part of the handle is thinner than the thickness of the handle (37) over a length of 15 mm or more from the rear end of the handle when viewed from the front, and the thickness of the rear end is 80% or less of the thickness of the handle (37). A weeder according to any one of claims 1 to 15, wherein the handle is inclined with respect to a horizontal plane so that, when viewed from the front in a position in which the projection area of the blade plate onto the horizontal plane is maximized from a light source directly above the blade plate, any straight line parallel to the center line of the handle passing through a section within 50 mm below the center line of the handle intersects with the blade plate.