JP2023041703A - Grass cutting blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grass cutting blade that, when sharpness decreased through the use, general users can easily increase the sharpness, even if they have no polishing device nor skilled polishing technique.

SOLUTION: On the outer periphery of a disk-like steel substrate, a large number of cutter units are integrally formed with a prescribed pitch and with the same steel plate as the substrate. Each cutter unit is nearly orthogonally bent for the substrate, and is provided with blades and concavity which is prepared in the rear part of the blade in the rotation direction.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2023,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mowing blade attached to a mowing machine for mowing grass and twigs in forests, gardens, fields, and the like.

Conventional mowing blades are known in which a large number of teeth are formed on the outer circumference of a disk-shaped base, and a carbide tipped blade is brazed to the tip of each tooth (see, for example, Patent Document 1). .
In mowing blades with brazed cemented carbide tipped blades, each tipped blade is ground using a dedicated diamond tool when the carbide tipped blades are worn and lose sharpness due to mowing work.

JP-A-10-42653

However, polishing a carbide tip with a diamond tool requires a high level of skill, so it is very difficult for ordinary users to sharpen the tip edge by polishing with a diamond tool. Therefore, when the sharpness of the cemented steel tip deteriorates due to mowing work, the general user often discards the mowing blade without going through the work of polishing the tip blade.
In addition, new carbide tipped blades tend to lose a little sharpness immediately after being used, and are characterized by a long-lasting state of reduced sharpness. However, as described above, it is difficult for the user to sharpen the cemented carbide tip, and the user has to use a slightly dull mowing blade for mowing work, which is inconvenient.

Therefore, according to the present invention, when sharpness has deteriorated due to use, general users can easily improve sharpness without having specialized polishing equipment or skilled polishing techniques. The purpose is to provide a mowing blade.
It is another object of the present invention to provide a mowing blade that prevents the blade from being damaged or deformed due to collision with a wall surface, is less likely to be worn, and enables smooth mowing work.

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

The mowing blade according to the present invention is characterized in that the cutter unit is bent at an angle of approximately 75 to 90 degrees with respect to the base portion.

In the mowing blade according to the present invention, the cutter unit is also characterized in that the recess provided at the rear portion of the blade portion in the rotational direction is formed to a depth approximately half the height of the blade portion. be.

ADVANTAGE OF THE INVENTION This invention has the following big effects.
In the mowing blade according to claim 1, a large number of cutter units are integrally formed on the outer periphery of a disk-shaped steel plate base portion at a predetermined pitch and by the same steel plate as the base portion, and each cutter unit is: It is characterized in that each cutter unit is bent so as to be nearly perpendicular to the base portion, and that each cutter unit is provided with a blade portion and a recess provided at the rear portion of the blade portion in the rotational direction. be.
Therefore, each cutter unit can cut grass efficiently even near a narrow wall, and the cutting blade can be used in a sharp state for a long period of time.
Moreover, each cutter unit can mow the material to be mowed under it, and accurate mowing is possible, resulting in very good working efficiency. It can also prevent kickback while in use.

In the mowing blade according to claim 2, when each of the cutter units is bent so as to be nearly perpendicular to the base portion, when the material to be cut is raised vertically, As a result, the material is rolled up along the blade, resulting in a problem of very poor cutting efficiency.
Therefore, if the angle of each cutter unit is bent to about 75° with respect to the base portion, the material to be cut can be efficiently cut by the blade portion.

In the mowing blade according to claim 3, in the cutter unit, the recess provided at the rear portion of the blade portion in the rotational direction is formed to a depth approximately half the height of the blade portion.
Therefore, the material to be cut is not rolled up along the cutting edge, and the cutting efficiency is very good.

1 is a schematic plan view showing a first embodiment (substantially perpendicular) of a mowing blade according to the present invention; FIG. It is the schematic bottom view. It is a schematic side view thereof. It is the schematic perspective view. Fig. 10 is a schematic plan view showing a second embodiment (angled) of the mowing blade according to the present invention; It is the schematic bottom view. It is a schematic side view thereof. It is the schematic perspective view. It is a reference perspective view showing the state of use. It is a reference perspective view which shows the modification of the mowing blade which concerns on this invention.

BEST MODE FOR CARRYING OUT THE INVENTION The mowing blade of the present invention will be described in detail below with reference to the drawings showing the embodiments.
1 to 4 show a first embodiment (substantially right-angled) of the mowing blade of the present invention. This mowing blade 11 has a disk-shaped steel plate base 12 on the outer circumference 12a, and a number of cutter units 13 are mounted on the outer circumference 12a. It is integrally formed with the pitch P and with the same steel plate as the base portion 12 .
In other words, the mowing blade 11 is formed by a disk-shaped base portion 12 formed by processing a piece of disk-shaped steel material, and a large number of cutter units 13 integrally connected to the outer circumference 12a of the base portion 12. It is

The plurality of cutter units 13 are formed integrally with the same steel plate as the base portion 12 with a predetermined pitch P, and each cutter unit 13 is drawn so as to be nearly perpendicular to the base portion 12. etc., and each cutter unit 13 is repeatedly provided with a blade portion 13a and a concave portion 13b provided at a rear portion of the blade portion 13a in the rotational direction. An inward folded portion 13c is formed when the cutter unit 13 is drawn. Therefore, each cutter unit 13 can cut grass efficiently even near a narrow wall, and the cutting blade 11 can be used in a sharp state for a long period of time. Moreover, each cutter unit 13 can mow the material to be mowed under it, which enables accurate mowing, and the working efficiency is very good. It also prevents kickbacks during use.

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

Further, the cutter unit 13 is formed with a laterally long hollow portion 13d at the base of the blade portion 13a.
Therefore, the material to be cut is not rolled up along the blade portion 13a, and the cutting efficiency is very good.
The mowing blade 11 may have its surface hardened to ensure its strength. It should be noted that quenching may make the mowing blade 11 too hard and reduce impact strength, so caution is required.

5 to 8 show a second embodiment (with an angle) of the mowing blade of the present invention. This mowing blade 21 has a disk-shaped steel plate-made base portion 22 and a large number of cutter units 23 on the outer circumference 22a. are formed integrally with the same steel plate as the base portion 22 with a predetermined pitch P. As shown in FIG.
When each cutter unit 23 is bent so as to be nearly perpendicular to the base body 22 as in the first embodiment, when the material to be cut is erected vertically, As a result, the material is rolled up along the blade portion 23a, resulting in a problem of poor cutting efficiency.
Therefore, if the angle of each cutter unit 23 is bent to about 75° with respect to the base portion 22, the material to be cut can be efficiently cut by the blade portion 23a. In addition, each cutter unit 23 can cut grass efficiently even near a narrow wall, and the cutting blade 21 can be used in a sharp state for a long period of time.

Also in this embodiment, the multiple cutter units 23 are formed integrally with the same steel plate as the base portion 22 with a predetermined pitch P, and each cutter unit 23 is about 75 mm from the base portion 22 . , and each cutter unit 23 is repeatedly provided with a blade portion 23a and a concave portion 23b provided at the rear portion of the blade portion 23a in the rotational direction. is formed with an inward folded portion 23c which is formed when each cutter unit 23 is drawn.

In the second embodiment (angled) of the mowing blade of the present invention as well, if each cutter unit 23 is bent so as to be nearly perpendicular to the base portion 22, the material to be cut is perpendicular to the blade. In such a case, the material to be cut is rolled up along the blade portion 23a, resulting in a very poor cutting efficiency.
However, if each cutter unit 23 is bent at an angle of about 75° with respect to the base portion 22 as in this embodiment, the material to be cut can be efficiently cut by the blade portion 23a. becomes.
The mowing blade 21 has its surface quenched or the like to ensure its strength. This quenching is very important because it greatly affects the life of the mowing blade 21 .

FIG. 9 shows an example of a shoulder type mower 31 to which the mowing blades 11 and 21 of Examples 1 and 2 are attached.

FIG. 10 shows a modification of the mowing blade according to the present invention. This mowing blade 41 has a disk-shaped steel plate-made base portion 42 on an outer circumference 42a, and a large number of cutter units 43 are attached to the base portion 42. It is integrally formed with the same steel plate.
If each cutter unit 43 is bent so that the angle of each cutter unit 43 is about 75° with respect to the outer circumference 42a of the base portion 42, as in the second embodiment, the material to be cut will reach the blade portion 43a. It will be cut efficiently. In addition, each cutter unit 43 can cut grass efficiently even near a narrow wall, and the cutting blade 41 can be used in a sharp state for a long period of time.

Also in this embodiment, the plurality of cutter units 43 are formed integrally with the same steel plate as the base portion 42 with a predetermined pitch P, and each cutter unit 43 is positioned about 75 degrees from the base portion 42 . , and each cutter unit 43 is repeatedly provided with a blade portion 43a and a concave portion 43b provided at the rear portion of the blade portion 43a in the rotational direction. is formed with an inward folded portion 43c which is formed when each cutter unit 43 is drawn.
In addition, by providing the cutting edge 43e on the blade portion 43a of each cutter unit 43 as in this modified example, it is possible to provide a mowing blade with a higher cutting efficiency. can.

Since the mowing blade of the present invention is constructed as described above, it can be suitably used for a shoulder mower. Of course, it goes without saying that the present invention can also be applied to mowers other than shoulder-mounted mowers.

11 mowing blade 12 steel plate base 12a outer periphery 13 cutter unit 13a blade 13b recess 13c folded portion 13d hollow portion 21 mowing blade 22 steel plate base 22a outer periphery 23 cutter unit 23a blade 23b recess 23c folded portion 31 shoulder mower 32 Scattering prevention cover 41 Unit 42 Base portion 42a Outer circumference 43 Cutter unit 43a Blade portion 43b Concave portion 43c Folded portion 43e Cutting edge P Predetermined pitch

Claims (3)

A large number of cutter units are integrally formed on the outer periphery of a disk-shaped steel plate base portion with a predetermined pitch and with the same steel plate as the base portion, and each cutter unit is substantially perpendicular to the base portion. A mowing blade, characterized in that each cutter unit is bent so as to come closer, and each cutter unit is provided with a blade portion and a recess provided at a rear portion of the blade portion in a rotational direction. The mowing blade according to claim 1, wherein the cutter unit is bent at an angle of approximately 75 to 90 degrees with respect to the base portion. 3. The mowing blade according to claim 1, wherein said cutter unit has a recess provided at a rear portion of said blade portion in the rotational direction, the recess being formed to a depth approximately half the height of said blade portion.

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