JP3056044U - Rotary blade of brush cutter - Google Patents

Abstract

(57) Abstract: A rotary blade of a brush cutter, wherein an inverted trapezoidal protruding portion (3) is integrally formed on each apex portion (2) of a square blade plate (1), and an entire outer peripheral edge (4). Is formed with a blade portion 5. [Effect] Since the inverted trapezoidal protrusions are integrally formed at each apical corner of the square blade plate, both sides of the protrusions are formed by the intersection of the inverted trapezoidal oblique side and the square side. A concave portion is formed, and in addition, a blade portion is formed on the entire outer peripheral edge of the blade plate. The blades are cut by the blades so that the plants can be cut sharply, and the plants are hardly wrapped around, and a safe mowing operation can be performed without worrying about the wrapping of the plants. Further, even if the pressing force on the plants is reduced as compared with the related art, and even if the number of rotations is reduced, cutting of the plants can be sharpened, and the degree of fatigue of the mowing operation can be reduced.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

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

[0002]

[Prior art]

 As rotary blades of brush cutters, Japanese Utility Model Publication No. 55-25787, Japanese Utility Model Publication No. 55-36975, Japanese Utility Model Publication No. 56-44343, Japanese Utility Model Publication No. 58-44816, Japanese Utility Model Application Publication No. 5-4832, etc. are proposed. As described above, rotary blades of brush cutters of various shapes and materials (steel, resin, etc.) have been proposed or have been practically used.

[0003]

[Problems to be solved by the invention]

 The rotary blades of the brush cutter proposed in Japanese Utility Model Publication No. 55-25787, Japanese Utility Model No. 55-36975, Japanese Utility Model No. 56-44343, and Japanese Utility Model Publication No. The protruding part is provided, and the blade part is provided on one or both sides of the protruding part.However, if the blade part is provided on both sides, the rotary blade is turned over and both blade parts are used. In addition to changing the shape of each blade, it can be used according to the condition of the vegetation. However, in the case of a rotary blade having this structure, the sharpness tends to be reduced. Although it is not clear whether this is the cause, vegetation often winds around the rotating blade. If the trees are wrapped in this way, not only must the cutting and cutting work be interrupted, but also there is a safety problem in the cutting and cutting work. And the degree of fatigue in the mowing work is large.

On the other hand, the tip saw proposed in Japanese Utility Model Laid-Open No. 5-4832 has a relatively small blade damage and is sharp and practical, but it is expensive to manufacture and is heavy in a narrow place or at home. It is uneconomical to use.

Accordingly, the present invention has been made in view of the above circumstances, and has as its object to improve the sharpness and to reduce the winding of plants and trees so that the mowing operation can be performed safely. It provides a blade.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the rotary blade of the brush cutter according to the present invention has an inverted trapezoidal protrusion integrally formed at each apex of a square blade plate, and a blade portion on the entire outer peripheral edge. Is formed.

In the above configuration, the inverted trapezoidal protrusions are integrally formed at each apex of the square blade plate, so that the inverted trapezoidal oblique side and the square trapezoidal shape are provided on both sides of the protrusions. A concave portion is formed by the intersection with the side, and in addition, a blade portion is formed on the entire outer peripheral edge of the blade plate, so that when cutting the vegetation, the vegetation is captured in the concave portion. In addition, the blades formed on the outer peripheral edge except for the concave parts are cut by stroking, so that the cutting of plants can be sharpened, and the plants are hardly wrapped around, and care is taken about the winding of plants. And safe mowing work is possible. In addition, the cutting force of the plant can be sharpened even if the pressing force on the plant is reduced and the rotation speed is reduced as compared with the conventional case.

[0008] In the rotary blade of the brush cutter according to the present invention, the base angle of the inverted trapezoidal projection formed at the apex is defined by the extension of the oblique side of the inverted trapezoidal projection. May be formed to be equal to or smaller than the base angle formed by passing through the vegetation, and this configuration makes it easier for the vegetation to be caught by the recess when cutting the vegetation. Therefore, the above-described effects can be more effectively enjoyed.

The shape of the blade plate in the rotary blade of the brush cutter according to the present invention may be any one of a regular triangular shape, a regular pentagonal shape, and a regular hexagonal shape in addition to a square shape. If it exceeds a square shape, the general size of this type of blade plate is about 150 mm to 250 mm in rotating diameter, so the spacing between the protrusions is narrow, and the plants are caught in the recess and it is difficult to cut On the other hand, in the manufacture of the rotary blade, it becomes difficult to perform the cutting work on the entire outer peripheral edge, and the manufacturing cost increases, which is not practical.

[0010]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of a rotary blade of a brush cutter according to the present invention, in which a is a plan view and b is a cross-sectional view taken along line AA of a.

The blade plate 1 is a steel plate having a thickness t of about 1.6 mm, and has a substantially square shape as shown in the figure, and an inverted trapezoidal projection 3 is integrally formed at each apex 2. ing. A blade portion 5 is formed on the entire outer peripheral edge 4 of the blade plate 1, and a mounting hole 6 for mounting on a rotating shaft of the brush cutter is formed in a central portion. In this example, the oblique side 7 of the protruding portion 3 at the opposing position is formed so as to be inclined so as to pass through the center of rotation of the blade plate 1, and on both sides of the protruding portion 3, the inverted trapezoidal oblique side 7 and the square side are provided. The recess 9 is formed by the intersection with the recess 8. The size of the blade plate 1 is about 200 mm in diagonal length, and the size of the protrusion 3 is about 50 mm in length of the base (tip side) 10 of the inverted trapezoidal shape and about 50 mm in height. It is about 20mm.

Since the rotary blade of the brush cutter according to the present invention has the above-described configuration, when cutting the vegetation using the rotary blade, the vegetation is captured by the concave portion 9 and the concave portion 9 is formed. The cutting is performed by the blades 5 formed before and after the cutting, so that the cutting of the vegetation can be sharpened, the vegetation hardly wraps around, and a safe mowing operation can be performed without worrying about the wrapping of the vegetation. Also, the cutting force of the plants can be sharpened even if the pressing force on the plants is reduced and the rotation speed is reduced. In addition, the rotary blade can be used on both the front and back surfaces. If the sharpness of the front surface deteriorates, cutting the plants can be similarly sharpened even if the installation to the brush cutter is reversed and used.

In the above example, the blade portion 5 is described as a single blade as shown in FIG. 1A, but may be formed on both blades as shown in FIG.

FIG. 3 and FIG. 4 are plan views of the rotary blade of the brush cutter according to the present invention showing another embodiment, and the rotary blade of the brush cutter shown in FIG. An inverted trapezoidal protrusion 3 is integrally formed on each of the apical corners 2 in a triangular shape, and a blade 5 is formed on the entire outer peripheral edge 4 of the blade plate 1. The rotary blade of the brush cutter shown in FIG. 3B has a blade plate 1 having a regular pentagonal shape, an inverted trapezoidal projection 3 formed integrally with each vertex 2, and an outer peripheral edge 4 of the blade plate 1. Are formed with the blade portions 5. In addition, the rotary blade of the brush cutter shown in FIG. 4 has a shape of a blade plate 1 having a regular hexagonal shape, and an inverted trapezoidal protruding portion 3 integrally formed at each apex portion 2. Are formed with the blade portions 5. As described above, even when the shape of the blade plate 1 is a regular triangle, a regular pentagon, or a regular hexagon, the same operation and effect as described in the above-described paragraph [0012] can be obtained.

[0015]

[Effect of the invention]

 As described above, according to the rotary blade of the brush cutter according to the present invention, since the inverted trapezoidal projections are integrally formed at each apex of the square blade plate, both sides of the projection are provided. The concave portion is formed by the intersection of the oblique side of the inverted trapezoid and the square side, and in addition, a blade portion is formed on the entire outer peripheral edge of the blade plate, so that when cutting grass, It is cut by the blades formed before and after the concave portion so as to be caught in the concave portion, and the cutting of the plant can be sharpened, and the plant is hardly wrapped, and it is safe without worrying about the wrapping of the plant. We can cut and brush. In addition, even if the pressing force on the plants is reduced as compared with the conventional case, and even if the number of rotations is reduced, cutting of the plants can be sharpened and the degree of fatigue of the mowing operation can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a rotary blade of a brush cutter according to the present invention, wherein a is a plan view and b is a cross-sectional view taken along line AA of a.

FIG. 2 is a partial cross-sectional view of another embodiment of the rotary blade of the brush cutter according to the present invention.

FIG. 3 is a plan view showing another embodiment of the rotary blade of the brush cutter according to the present invention, wherein a denotes a blade plate having a regular triangular shape;
Is an example where the shape of the blade plate is a regular pentagonal shape.

FIG. 4 is a plan view showing another embodiment of the rotary blade of the brush cutter according to the present invention, in which the shape of the blade plate is a regular hexagon.

[Explanation of symbols]

1: Blade plate 2: Apex corner
3: Projection 4: Outer edge 5: Blade
6: Mounting hole 7: Inverted trapezoidal oblique side 8: Square side
9: recess 10: inverted trapezoidal bottom

Claims (3)

[Utility model registration claims] 1. A rotary blade of a brush cutter, wherein an inverted trapezoidal protrusion is integrally formed at each apex portion of a square blade plate, and a blade portion is formed on an entire outer peripheral edge. . 2. The base angle of the inverted trapezoidal projection formed at the apex corner is the same as the base angle formed by the extension of the hypotenuse of the inverted trapezoidal projection passing through the center of rotation. The rotary blade of the brush cutter according to claim 1, wherein the rotary blade is formed to be smaller than that. 3. The rotary blade of the brush cutter according to claim 1, wherein the square blade plate is replaced with a blade plate of any one of a regular triangle, a regular pentagon, and a regular hexagon.