JP6664633B1 - Rotary cutting blade for brush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary cutting blade for a brush cutter capable of cutting grass more efficiently. A rotary cutting blade (10) for a brush cutter that cuts grass by mounting a blade for mowing on a rotary shaft (6), and mainly has a mounting part for mounting on the rotary shaft (6). A flat plate-shaped rotary main body 12 provided on the outer peripheral portion, and a blade portion 14 protruding from the outer edge of the rotary main body 12 toward the outer diameter side and inclined to form a predetermined angle with respect to the rotary main body 12. The blade portion 14 includes an even number of plate portions 16a to 16d, and the adjacent plate portions 16a to 16d are inclined with respect to the rotary body portion 12 so as to form predetermined angles in opposite directions. Characterize that. [Selection diagram] Fig. 1

Description

  The present invention relates to a rotary blade for a brush cutter.

  2. Description of the Related Art Conventionally, when weeds and the like grow and grow in fields where agricultural products are grown, mowing is appropriately performed. As a technique related to the present invention, for example, Patent Literature 1 discloses a free angle of a peripheral edge portion (3) of a rotary cutter (1) having a mounting hole (2) for a rotary shaft (A) of a mower in the center. There is disclosed a mowing rotary cutter which is provided with a protective band (5) projecting from a tip (4a) of each tooth (4) of a peripheral edge portion (3) at intervals.

JP-A-11-46546

  According to Patent Literature 1, grass can be cut by rotating a disk-shaped rotary cutter. However, if the grass continues to be cut, the cut grass winds around the rotation shaft portion and cannot be cut efficiently. May be in a state.

  An object of the present invention is to provide a rotary cutting blade for a bush cutter capable of cutting grass more efficiently.

The rotary cutting blade for a brush cutter according to the present invention is a rotary cutting blade for a brush cutter for cutting grass by mounting a blade for mowing on a rotary shaft and rotating the blade, and mounted on the rotary shaft. A mounting portion for mounting is provided at the center portion of the rotating main body portion in a flat plate shape, and is projected from an outer edge portion of the rotating main body portion to an outer diameter side, and is inclined so as to form a predetermined angle with respect to the rotating main body portion. And four blade portions, wherein the four blade portions are projected at equal intervals in a circumferential direction, and an adjacent blade portion of each of the blade portions is provided with respect to the rotating main body portion. , And are inclined so as to form the predetermined angle in opposite directions.

Further, in the rotary cutting blade for a brush cutter according to the present invention, a rotary cutting blade for a brush cutter for cutting grass by mounting a blade for mowing on a rotary shaft portion and rotating the rotary shaft portion, A flat-plate-shaped rotating main body portion provided with a mounting portion for mounting on a central portion, and an outer peripheral portion of the rotating main body portion is projected to an outer diameter side and tilted so as to form a predetermined angle with respect to the rotating main body portion. And three blade portions provided, wherein the three blade portions are protruded at equal intervals in a circumferential direction, each blade portion includes two plate portions, and each blade portion Preferably, the adjacent plate portions are inclined to form the predetermined angle in opposite directions with respect to the rotation main body portion .
Further, in the rotary cutting blade for a brush cutter according to the present invention, a rotary cutting blade for a brush cutter for cutting grass by mounting a blade for mowing on a rotary shaft portion and rotating the rotary shaft portion, A flat-plate-shaped rotating main body portion provided with a mounting portion for mounting on a central portion, and an outer peripheral portion of the rotating main body portion is projected to an outer diameter side and tilted so as to form a predetermined angle with respect to the rotating main body portion. And two blade portions provided, wherein the two blade portions are protruded at equal intervals in a circumferential direction, and each blade portion includes two plate portions, and each blade portion includes Preferably, the adjacent plate portions are inclined to form the predetermined angle in opposite directions with respect to the rotation main body portion.

  According to the present invention, grass can be cut more efficiently.

It is a top view and a side view of a rotary cutting blade for a brush cutter of an embodiment concerning the present invention. FIG. 4 is a plan view illustrating a state where a user cuts grass using a brush cutter equipped with a rotary cutter blade for the brush cutter in the embodiment according to the present invention. In the embodiment according to the present invention, it is a figure showing a grass growing in a field or the like and a state where a user is about to cut grass using a brush cutter equipped with a rotary cutter blade for the brush cutter. In the embodiment which concerns on this invention, it is the top view and side view of the rotary cutting blade for the brush cutter which is a 1st modification. It is the top view and side view of the rotary cutting blade for the brush cutter which is a 2nd modification in embodiment concerning this invention. It is the top view and side view of the rotary cutting blade for brush cutters which are a 3rd modification in embodiment concerning this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, the same reference numerals are given to the same elements in all the drawings, and overlapping description will be omitted. Further, in the description in the text, the symbols described earlier are used as necessary.

  FIG. 1 is a plan view and a side view of a rotary cutting blade 10 for a brush cutter according to an embodiment of the present invention. FIG. 2 is a plan view showing how the user 2 cuts grass using the bush cutter 4 to which the rotary blade 10 for the bush cutter is mounted.

  FIG. 3 is a diagram illustrating grass growing in a field or the like and a situation where the user 2 is about to cut grass using the brush cutter 4 equipped with the rotary blade 10 for the brush cutter.

  The mower 4 is a machine for mowing grass and small-diameter trees while being operated by the user 2, and may also be called a mower or a bush. The brush cutter 4 includes a prime mover, a shaft that is rotated by the prime mover, and a rotary blade 10 for the brush cutter mounted on a rotating shaft 6 provided at a tip of the shaft.

  The user 2 operates the handle fixed to the shaft of the bush cutter 4 to perform mowing, and can adjust the rotation speed of the engine by adjusting the lever-shaped throttle provided on the handle.

  The rotary cutting blade 10 for the brush cutter is a blade for mowing the grass by mounting it on the rotary shaft 6 and rotating the blade. The rotary blade 10 for the brush cutter includes a rotary body 12 and a blade 14.

  The rotary cutting blade 10 for a brush cutter is a material having a suitable strength, for example, a type of steel that is an alloy of iron and carbon, in which the content of elements other than carbon is less than or equal to the amount not classified as alloy steel. Certain carbon steel can be used.

  The rotating main body 12 is a flat circular member provided with a mounting portion for mounting on the rotating shaft 6 at the center. To describe an example of the size of the rotating body 12, the radius of the circle is 85 mm and the thickness is 1.4 mm. Further, a through hole 11 having a diameter of 25 mm is formed in the center of the rotating main body 12. The through hole 11 is a hole to be mounted on the rotating shaft 6 at the tip of the shaft of the brush cutter 4.

The blade portion 14 protrudes from the outer edge of the rotating main body portion 12 toward the outer diameter side, and is inclined so as to form a predetermined angle with respect to the rotating main body portion 12. The predetermined angle, specifically, as shown in FIG. 1, the angle theta ₁ with the radial direction of the rotating body portion 12, here will be described as a 30 °.

The blade portion 14 includes four plate portions 16a, 16b, 16c, and 16d. Plate portions 16a, 16b, 16c, in 16d, the plate portion 16a, 16c are tilted at an angle theta ₁ in the same direction, it is inclined to the plate portion 16b, 16d forms an angle theta ₁ in the same direction ing. In addition, the radial length of the plate portions 16a to 16d can be set to, for example, 45 mm.

As shown in FIG. 1, the plate portions 16b and 16d are bent downward, and the plate portions 16a and 16c are bent upward. That is, the adjacent plate portions 16a~16d, to the rotary body portion 12, are inclined to form a predetermined angle theta ₁ in opposite directions. As described above, since the blade is bent in a balanced state, the rotary blade 10 for the brush cutter can be rotated in a balanced state when the blade is mounted on the brush cutter 4.

As shown in FIG. 1, the plate portions 16a to 16d have blades 15 for mowing at both ends along the projecting direction. Here, although described as the angle theta ₂ of the blades 15 is 45 ° for each plate portions 16 a to 16 d, of course, can be changed as appropriate. As described above, the blades 15 are formed at both ends of the plate portions 16a to 16d along the protruding direction, so that the grass can be cut regardless of whether the rotation direction of the rotary cutting blade 10 for the brush cutter is rotated left or right. Can be done.

  Next, the operation of the rotary cutting blade 10 for the brush cutter having the above configuration will be described. In a field where crops are grown, when weeds grow and grow, it is necessary to mow the grass at an appropriate timing. Mowing the grass by hand takes time and effort, so the mowing machine 4 may be used for mowing.

  Since the rotary blade of a general brush cutter is a circular plate-shaped saw, as shown in FIG. 2, the user 2 operates the handle of the brush cutter 4 so that the movement of the rotary blade becomes an arc. When the grass is cut, the cut grass is wrapped around the rotating shaft 6 while the grass is being cut. When the wrapped grass increases, there is a problem that the working efficiency is reduced afterwards because the grass is not cut well.

  The rotary blade of the conventional brush cutter is a circular plate-shaped saw as described above, and cuts the grass by rotation. Even if the blade is cut in a single character, the grass does not immediately fall and the upright state is maintained. Therefore, when the handle of the brush cutter 4 is operated in an arc shape, the grass in the upright state is involved.

  Here, the rotary blade 10 for the brush cutter of the embodiment of the present invention is bent up and down such that the plate portions 16b and 16d are bent downward and the plate portions 16a and 16c are bent upward. It is characterized by having a blade portion 14.

When the grass is cut in a state where the rotary cutting blade 10 for the brush cutter is rotated, the grass 3 is cut at two places, an upper part 5T and a lower part 5B, as shown in FIG. First, either the upper part 5T or the lower part 5B is cut first, and the other is cut later, but one side is already cut when the plate parts 16a to 16d cutting the other come into contact. Therefore, the grass 3 can be cut while falling down. Incidentally, the plate portion 16a~16d has an inclination angle theta _1, since the upper 5T, lower 5B is beveled, there is an advantage that tends grass 3, taken slipping down.

  In this manner, the grass 3 can be cut while falling down, so that the cut grass 3 can be prevented from wrapping around the rotating shaft 6. This has a remarkable effect that the grass can be cut efficiently.

  Next, a rotary cutting blade 10a for a brush cutter, which is a first modified example of the rotary blade 10 for a brush cutter, will be described. FIG. 4 is a plan view and a side view of the rotary blade 10a for the brush cutter.

  The rotary cutting blade 10a for the bush cutter is a blade for mowing to cut the grass by being mounted on the rotary shaft 6 and rotating, similarly to the rotary blade 10 for the bush cutter. The differences will be mainly described. The rotary cutting blade 10a for the brush cutter includes a rotary body 12a and a blade 14a.

  The rotating main body 12a is a substantially cross-shaped flat plate member in which a mounting portion for mounting to the rotating shaft 6 is provided at the center. The through-hole 11 a is a hole for mounting the rotary shaft 6 at the tip of the shaft of the brush cutter 4.

The blade 14a protrudes from the outer edge of the rotating main body 12a toward the outer diameter side, and is inclined so as to form a predetermined angle with respect to the rotating main body 12a. The predetermined angle, specifically, as shown in FIG. 4, the angle theta ₁ with the radial direction of the rotating main body portion 12a, here be described as a 30 °.

The blade portion 14 is configured to include four plate portions 17a, 17b, 17c, and 17d. In the plate portion 17a to 17d, the angle theta ₁ with the radial direction of the rotating body portion 12a, the plate portion 17a, and 17c are inclined in the same downward, the plate portion 17b, and 17d are inclined in a direction the same upward I have.

  Next, the operation of the rotary blade 10a for the brush cutter will be described. The rotary cutting blade 10a for the brush cutter is provided with plate portions 17a to 17d that are vertically inclined in the same manner as the plate portions 16a to 16d of the rotary cutter blade 10 for the brush cutter, and cuts the grass 3 while falling down. Therefore, there is a remarkable effect that the grass can be efficiently mown while suppressing the grass mowed around the rotating shaft portion 6.

  Next, a rotary cutter blade 10b for a brush cutter, which is a second modification of the rotary cutter blade 10 for the cutter, will be described. FIG. 5 is a plan view and a side view of the rotary blade 10b for the brush cutter.

  The rotary cutting blade 10b for the bush cutter is a blade for mowing to cut the grass by being mounted on the rotary shaft 6 and rotating, similarly to the rotary blade 10 for the bush cutter. The differences will be mainly described. The rotary blade 10b for the brush cutter includes a rotary body 12b and a blade 14b.

  The rotation main body 12b is a three-pronged flat plate member provided with a mounting portion for mounting on the rotation shaft portion 6 at the center, and divided into three parts and shifted in the radial direction to protrude in a direction shifted by 120 °. The through hole 11b is a hole for mounting the rotary shaft 6 at the tip of the shaft of the brush cutter 4.

Blade portion 14b protrudes from the outer edge portion of the rotatable body portion 12b on the outer diameter side, are inclined to form a predetermined angle theta ₁ with respect to the rotating body portion 12b. The blade part 14 is configured to include three protruding plate parts 18a, 18b, 18c.

Constituted projecting plate portion 18a, as in respect to the rotation body portion 12b forms a predetermined angle theta _1, a plate portion 18a ₁ which is inclined upward, and a plate portion 18a ₂ which is inclined to the lower side .

Constituted projecting plate portion 18b, such that the relative rotation body portion 12b forms a predetermined angle theta _1, a plate portion 18b ₁ which is inclined upward, and a plate portion 18b ₂ which is inclined to the lower side .

Constituted projecting plate portion 18c is so to rotate the body portion 12b forms a predetermined angle theta _1, a plate portion 18c ₁ which is inclined upward, and a plate portion 18c ₂ which is inclined to the lower side .

Next, the operation of the rotary blade 10b for the brush cutter will be described. The rotary cutting blade 10b for the brush cutter includes six plate portions 18a ₁ , 18a ₂ , 18b ₁ , 18b ₂ , 18c which are tilted up and down similarly to the plate portions 16a to 16d of the rotary cutter blade 10 for the brush cutter. ₁ , 18c ₂ are provided, and cutting can be performed while the grass 3 is being tilted. Therefore, the grass can be cut efficiently while suppressing the cut grass from being wound around the rotating shaft portion 6. Effect.

  Next, a rotary cutting blade 10c for a brush cutter, which is a third modified example of the rotary blade 10 for a brush cutter, will be described. FIG. 6 is a plan view and a side view of the rotary cutting blade 10c for the brush cutter.

  The rotary cutting blade 10c for the bush cutter is a blade for mowing to cut the grass by being mounted on the rotary shaft portion 6 and rotating similarly to the rotary blade 10 for the bush cutter. The differences will be mainly described. The rotary blade 10c for the brush cutter includes a rotary body 12c and a blade 14c.

  The rotating main body 12b is a rectangular flat plate member in which a mounting portion for mounting on the rotating shaft 6 is provided at the center. The through-hole 11 c is a hole for mounting on the rotating shaft 6 at the tip of the shaft of the brush cutter 4.

Blade portion 14c protrudes from an outer edge of the rotatable body portion 12c on the outer diameter side, are inclined to form a predetermined angle theta ₁ with respect to the rotating body portion 12c. The blade portion 14 is configured to include two protruding plate portions 19a and 19b.

Constituted projecting plate portion 19a, as in respect to the rotation body portion 12b forms a predetermined angle theta _1, a plate portion 19a ₁ which is inclined upward, and a plate portion 19a ₂ which is inclined to the lower side .

Constituted projecting plate portion 19b, such that the relative rotation body portion 12b forms a predetermined angle theta _1, a plate portion 19b ₁ which is inclined upward, and a plate portion 19b ₂ which is inclined to the lower side .

Next, the operation of the rotary cutting blade 10c for the brush cutter will be described. Rotation cutting blade 10c for brush cutter, the plate portion _19a 1 of the four which is inclined to the vertical similar to the plate portion 16a~16d of the rotary cutting blade 10 for brush _{cutter, 19a 2, 19b 1, 19b} 2 are provided Since the grass 3 can be cut while falling down, there is a remarkable effect that the grass can be cut efficiently while the cut grass is not wrapped around the rotating shaft portion 6.

2 user, 3 grass, 4 brush cutter, 5B lower part, 5T upper part, 6 rotary shaft part, 10, 10a, 10b, 10c rotary cutter blade for brush cutter, 11, 11a, 11b, 11c through hole,
12, 12a, 12b, 12c rotatable body portion, 14, 14a, 14b, 14c blade section 15 cutting edge, 16a, 16b, 16c, 16d , 17a, 17b, 17c, 17d, 18a 1, 18a 2, 18b 1, 18b _{2, 18c 1, 18c 2,} 19a 1, 19a 2, 19b 1, 19b 2 plate portion, 18a, 18b, 18c projecting plate portion.

Claims (3)

A rotary cutting blade for a brush cutter that cuts grass by mounting a blade for mowing on a rotating shaft and rotating the blade,
A flat-plate-shaped rotating main body portion provided with a mounting portion for mounting on the rotating shaft portion at a central portion,
Four blades protruding from the outer edge of the rotating body to the outer diameter side and inclined to form a predetermined angle with respect to the rotating body;
With
The four blades are projected at equal intervals in the circumferential direction,
A rotary cutting blade for a brush cutter, wherein adjacent blade portions of the respective blade portions are inclined with respect to the rotating main body portion so as to form the predetermined angle in opposite directions. A rotary cutting blade for a brush cutter that cuts grass by mounting a blade for mowing on a rotating shaft and rotating the blade,
A flat-plate-shaped rotating main body portion provided with a mounting portion for mounting on the rotating shaft portion at a central portion,
Three blades protruding from the outer edge of the rotating body to the outer diameter side and inclined to form a predetermined angle with respect to the rotating body;
With
The three blades are protruded at equal intervals in the circumferential direction,
Each of the blade portions includes two plate portions,
A rotary cutting blade for a brush cutter, wherein an adjacent plate portion among the blade portions is inclined to form the predetermined angle in opposite directions with respect to the rotary body portion. A rotary cutting blade for a brush cutter that cuts grass by mounting a blade for mowing on a rotating shaft and rotating the blade,
A flat-plate-shaped rotating main body portion provided with a mounting portion for mounting on the rotating shaft portion at a central portion,
Two blades protruding from the outer edge of the rotating body to the outer diameter side and inclined to form a predetermined angle with respect to the rotating body;
With
The two blades are projected at equal intervals in the circumferential direction,
Each of the blade portions includes two plate portions,
A rotary cutting blade for a brush cutter, wherein an adjacent plate portion among the blade portions is inclined to form the predetermined angle in opposite directions with respect to the rotary body portion.

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