JP3246576U - Grass cutting blade - Google Patents

Abstract

[Problem] To provide a grass cutting blade whose sharpness can be easily improved without specialized sharpening equipment or skilled sharpening techniques when the sharpness of the blade decreases with use. [Solution] A large number of cutter units 23 are integrally formed at a predetermined pitch from the same steel plate as the base on the outer periphery of a disk-shaped steel plate base 22, each cutter unit is bent so as to be nearly perpendicular to the base, and each cutter unit is provided with a blade 23a and a recess 23b provided at the rear of the blade in the rotation direction, and an inward folded portion 23c is formed in the middle of each recess. [Selected Figure] Figure 5

Description

This invention relates to a grass cutting blade that is attached to a brush cutter to cut grass and twigs in forests, gardens, fields, etc.

A conventional grass cutting blade is known that has a large number of teeth formed on the outer periphery of a disk-shaped base body, and has a super-steel tip blade brazed to the tip of each tooth (see, for example, Patent Document 1).
In the case of a grass cutting blade having a brazed super steel tip blade, when the super steel tip blade becomes worn and loses its sharpness during weeding work, each tip blade is sharpened using a dedicated diamond tool.

Japanese Patent Application Laid-Open No. 10-42653

However, since grinding the carbide tip with a diamond tool requires a skilled technique, it is very difficult for an average user to improve the sharpness of the tip blade by grinding with a diamond tool. Therefore, when the sharpness of the carbide tip becomes dull after mowing, average users often discard the grass cutting blade without grinding the tip blade.
In addition, a new cemented carbide tipped blade has the characteristic that its sharpness becomes somewhat dull immediately after use, and that dulled sharpness continues for a long time. However, as described above, it is difficult for a user to sharpen the cemented carbide tipped blade, and the user ends up using a grass cutting blade that has become somewhat dull, which is inconvenient to use.

Therefore, the object of this invention is to provide a grass cutting blade that allows a general user to easily improve the sharpness of the blade when the sharpness of the blade deteriorates with use, even without having a specialized sharpening device or skilled sharpening techniques.
Another object of the present invention is to provide a grass cutting blade which is resistant to wear by preventing the blade from colliding with a wall surface and being damaged or deformed, and which allows smooth mowing work.

In order to achieve the above object, the grass cutting blade of the present invention is characterized in that a number of cutter units are formed integrally with the same steel plate as the base at a predetermined pitch on the outer periphery of a disk-shaped steel plate base, each cutter unit is bent so as to be nearly perpendicular to the base, and each cutter unit is provided with a blade portion and a recess provided at the rear of the blade portion in the rotational direction.

The grass cutting blade of this invention is also characterized in that the cutter unit is bent at an angle of approximately 75 to 90 degrees relative to the base portion.

In the grass cutting blade of this invention, the cutter unit is also characterized in that the recess provided at the rear of the blade in the rotational direction is formed to a depth of approximately half the height of the blade.

This invention has the following major advantages:
The grass cutting blade of claim 1 is characterized in that a number of cutter units are formed at a predetermined pitch around the outer periphery of a disk-shaped steel plate base, and are integrally made of the same steel plate as the base, each cutter unit is bent so as to be nearly perpendicular to the base, and each cutter unit is provided with a blade portion and a recess provided at the rear of the blade portion in the rotational direction.
Therefore, each cutter unit can cut grass efficiently even in narrow areas close to walls, and the grass cutting blade can be used in a sharp state for a long period of time.
In addition, each cutter unit can cut the material underneath it, making it possible to cut accurately and improving work efficiency. Also, kickback during use can be prevented.

In the grass cutting blade of claim 2, when each cutter unit is bent so as to be nearly at a right angle to the base portion, if the material to be cut is standing vertically, the material will end up being wound up along the blade portion, resulting in very poor cutting efficiency.
Therefore, if the angle of each cutter unit is bent to approximately 75 degrees with respect to the base portion, the material to be cut can be efficiently cut by the blade portion.

In the grass cutting blade according to the third aspect, the cutter unit has a recess provided at the rear of the blade in the rotational direction, the recess being formed to a depth approximately half the height of the blade.
Therefore, the material to be cut is not wound up along the blade, and cutting efficiency is very good.

1 is a schematic plan view showing a first embodiment (almost right angle) of a grass cutting blade according to the present invention; FIG. FIG. FIG. FIG. FIG. 4 is a schematic plan view showing a second embodiment (angled) of a grass cutting blade according to the present invention. FIG. FIG. FIG. FIG. FIG. 11 is a reference perspective view showing a modified example of the grass cutting blade according to the present invention.

The grass cutting blade of the present invention will be described in detail below with reference to the drawings showing an embodiment.
Figures 1 to 4 show a first embodiment (almost right angle) of the grass cutting blade of the present invention, and this grass cutting blade 11 has a number of cutter units 13 integrally formed on the outer periphery 12a of a disk-shaped steel plate base 12 at a predetermined pitch P and made of the same steel plate as the base 12.
In other words, the grass cutting blade 11 is formed of a disk-shaped base portion 12 formed by processing a single disk-shaped steel material, and a number of cutter units 13 integrally connected to the outer periphery 12a of the base portion 12.

The numerous cutter units 13 are formed integrally with the base 12 from the same steel plate at a predetermined pitch P, and each cutter unit 13 is bent by drawing or the like so as to be nearly perpendicular to the base 12, and each cutter unit 13 is provided with a blade 13a and a recess 13b at the rear of the blade 13a in the rotation direction, and an inward folded portion 13c formed when drawing each cutter unit 13 is formed between each blade 13a and the recess 13b. Therefore, each cutter unit 13 can efficiently cut grass even at a narrow wall, and the grass cutting blade 11 can be used in a sharp state for a long period of time. Each cutter unit 13 can also cut the material below it, allowing for accurate cutting and very efficient work. It can also prevent kickback during use.

Incidentally, the cutter unit 13 has a recess 13b provided at the rear of the blade portion 13a in the rotational direction, the recess 13b being formed to a depth approximately half the height of the blade portion 13a.
Therefore, the material to be cut is not wound up along the blade portion 13a, and the cutting efficiency is very good.

The cutter unit 13 has a horizontally long hollow portion 13d formed at the base of the blade portion 13a.
Therefore, the material to be cut is not wound up along the blade portion 13a, and the cutting efficiency is very good.
The grass cutting blade 11 can be provided with sufficient strength by subjecting its surface to quenching or the like. However, care must be taken because quenching may make the grass cutting blade 11 too hard, which may reduce its impact strength.

Figures 5 to 8 show a second embodiment (angled) of the grass cutting blade of the present invention, in which the grass cutting blade 21 has a disk-shaped steel plate base 22 on its outer periphery 22a, on which a number of cutter units 23 are integrally formed at a predetermined pitch P and made of the same steel plate as the base 22.
When each cutter unit 23 is bent nearly at a right angle to the base portion 22 as in the first embodiment, if the material to be cut is standing vertically, the material will end up being wound up along the blade portion 23a, resulting in poor cutting efficiency.
Therefore, if the angle of each cutter unit 23 is bent to be approximately 75° with respect to the base portion 22, the material to be cut can be efficiently cut by the blade portion 23a. Also, each cutter unit 23 can efficiently cut grass even in a narrow wall, and the grass cutting blade 21 can be used in a sharp state for a long period of time.

In this embodiment, the numerous cutter units 23 are also formed integrally with the base portion 22 from the same steel plate at a predetermined pitch P, and each cutter unit 23 is bent by drawing or the like so as to be approximately 75° relative to the base portion 22, and each cutter unit 23 is repeatedly provided with a blade portion 23a and a recess 23b provided at the rear of the blade portion 23a in the rotational direction, and an inward folded portion 23c is formed in the middle of each recess 23b when the cutter unit 23 is drawn.

Even in the second embodiment (angled) of the grass cutting blade of the present invention, if each cutter unit 23 is bent so as to be nearly at a right angle to the base portion 22, if the material to be cut is standing vertically, the material will end up being wound up along the blade portion 23a, resulting in very poor cutting efficiency.
However, as in this embodiment, if the angle of each cutter unit 23 is bent to approximately 75° with respect to the base portion 22, the material to be cut can be efficiently cut by the blade portion 23a.
The grass cutting blade 21 is provided with strength by subjecting its surface to hardening or the like. This hardening is very important since it significantly affects the service life of the grass cutting blade 21.

Figure 9 shows an example of a shoulder-mounted grass cutter 31 that is used by attaching the grass cutting blades 11 and 2 of Examples 1 and 2, and 32 is a cover to prevent cut grass and other debris from scattering.

FIG. 10 shows a modified example of a grass cutting blade according to the present invention. In this grass cutting blade 41, a number of cutter units 43 are integrally formed on the outer periphery 42a of a disk-shaped steel plate base 42 using the same steel plate as the base 42.
If the cutter units 43 are bent at an angle of approximately 75° with respect to the outer periphery 42a of the base portion 42 as in the second embodiment, the material to be cut can be efficiently cut by the blade portion 43a. Also, the cutter units 43 can efficiently cut grass even in narrow areas close to walls, and the grass cutting blade 41 can be used in a sharp state for a long period of time.

In this embodiment as well, the numerous cutter units 43 are formed integrally with the base portion 42 from the same steel plate at a predetermined pitch P, and each cutter unit 43 is bent by drawing or the like so as to be approximately 75° relative to the base portion 42, and each cutter unit 43 is repeatedly provided with blade portions 43a and recesses 43b provided at the rear of the blade portions 43a in the rotational direction, and an inward folded portion 43c is formed in the middle of each recess 43b when each cutter unit 43 is drawn.
In addition, by providing the cutting blade 43e on the blade portion 43a of each cutter unit 43 as in this modified example, it is possible to provide a grass cutting blade with a higher cutting efficiency.

The grass cutting blade of this invention is constructed as described above, so it can be used effectively in shoulder-mounted grass cutters. Of course, it goes without saying that it can also be used in grass cutters other than shoulder-mounted grass cutters.

11 Grass-cutting blade 12 Steel plate base portion 12a Outer periphery 13 Cutter unit 13a Blade portion 13b Recess 13c Folded portion 13d Hollow portion 21 Grass-cutting blade 22 Steel plate base portion 22a Outer periphery 23 Cutter unit 23a Blade portion 23b Recess 23c Folded portion 31 Shoulder-mounted grass cutter 32 Scattering prevention cover 41 Unit 42 Base portion 42a Outer periphery 43 Cutter unit 43a Blade portion 43b Recess 43c Folded portion 43e Cutting blade P Predetermined pitch

Claims (3)

A grass cutting blade characterized in that cutter units are formed at a predetermined pitch around the outer periphery of a disk-shaped steel plate base, and are integrally formed from the same steel plate as the base, each cutter unit is bent so as to be nearly perpendicular to the base, and each cutter unit is provided with a blade and a recess provided at the rear of the blade in the rotational direction. The grass cutting blade according to claim 1, characterized in that the cutter unit is bent at an angle of approximately 75 to 90 degrees relative to the base portion. 3. The grass cutting blade according to claim 1, wherein the cutter unit has a recess provided at a rear portion of the blade in a rotational direction, the recess having a depth approximately half the height of the blade.

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