JP3180762U - Brush cutter for brush cutter - Google Patents

Abstract

A brush cutter for a brush cutter with improved safety by improving the balance at the time of rotation and preventing the cutting edge from biting into grassland or soil and improving safety.
In a brush cutter blade 1 composed of a disc-shaped rotating body 3 having a shaft hole 2 formed in the center, a plurality of wave surfaces concentric with the shaft hole 2 are formed on one surface 3a of the rotating body 3. did. Specifically, convex curved portions 4a, 4b, and 4c inclined upward at a predetermined angle θ from the axial hole 2 in the radial direction are formed, and the convex curved portions 4a, 4b, and 4c are formed into a concave curved surface 5a. The wave surfaces were formed by connecting them at 5b and 5c, and the inclination angles of the convex curved portions 4a, 4b and 4c were 1 to 45 degrees.
[Selection] Figure 1

Description

  The present invention relates to a cutting blade for a brush cutter that improves the cutting performance by causing the locus of the cutting edge to rotate during the rotation, and prevents the cutting edge from biting into grassland or soil, thereby improving safety.

  As a cutting blade of a brush cutter used for cutting grass, cutting under a forest or cutting a small-diameter tree, as shown in FIG. 11 (a), a disk-shaped rotating body 13 having a shaft hole 12 drilled in the center thereof. There is known a brush cutter 11 for a brush cutter in which a large number of cemented carbide chips 14 are brazed to the outer peripheral portion at regular intervals as a blade portion. In addition, a configuration in which the blade portion is directly engraved on the outer peripheral portion of the rotating body 13 instead of the carbide tip 14 is also known. In use, as shown in FIG. 11 (b), the gear portion 16 connected to the shaft 15 of the brush cutter main body (not shown) is connected to the shaft hole 12 so that it can be detachably attached to the brush cutter main body. Yes. And as shown in FIG.11 (b), the rotary surface 13a of the rotary body 13 of the conventional brush cutter blade is straight from the shaft hole 12 to the outer peripheral part, and is located on the same plane. .

  Further, in order to prevent grass winding, which is one of the problems of a brush cutter, a plurality of grass winding prevention blades provided with a plurality of grass winding prevention holes slightly larger than the shaft hole on a concentric circle with the shaft hole. (Patent Document 1) and a mowing blade provided with a plurality of protrusions in which an anti-winding blade portion is formed on a portion of the rotating body facing the rotation direction on one main surface of the rotating body are also provided. (Patent Document 2).

Utility Model Registration No. 2541579 Japanese Patent No. 4137758

  Since the cutting blade for a brush cutter rotates at a high speed, the brush cutting operation requires great care. The conventional cutting blades for brush cutters are dangerous because the rotation trajectory of the blade portion is a linear circle, the blade portion is easy to bite into the ground or grassland and is difficult to come out, and pebbles and the like rebound more frequently. Was expensive. When the cutting edge hits the curb or stone, the cutting edge is often damaged or worn, and it is necessary to frequently repair the carbide tip as the cutting edge or to polish the cutting edge. . In addition, the damage and wear of the blade edge caused the balance of the blade for the brush cutter to go wrong, increasing the risk. Furthermore, the mowing grass often wraps around or entangles with the shaft of the brush cutter, and it is necessary to interrupt and remove the work each time.

  According to the cutting blades for brush cutters shown in Patent Documents 1 and 2, the grass cutting prevention means is employed, but according to Patent Document 1, it is necessary to separately form a plurality of grass winding preventing holes. In addition, according to Patent Document 2, it is necessary to separately form a wrapping prevention blade portion, which is not only complicated, but also has a risk of losing the balance of the brush blade for a brush cutter.

  Therefore, the present invention pays attention to the rotation trajectory of the blade part of the brush cutter for the brush cutter, and by making the rotation trajectory into a circular shape made of a wave-like curve, the brush cutting performance is improved and the cutting edge of the cutting edge to the grassland or soil is An object of the present invention is to provide a brush cutter for a brush cutter that prevents biting and has improved safety.

  In order to achieve the above-mentioned object, the present invention is a brush cutter for a brush cutter comprising a disc-shaped rotating body having a shaft hole formed in the center thereof, and a plurality of wave surfaces concentric with the shaft hole are bent on one surface of the rotating body. The brush cutter for the brush cutter is provided as a basis. Then, a convex curved portion that is inclined upward at a predetermined angle in the radial direction from the shaft hole is formed, and a wave surface is formed by connecting the convex curved portions with a concave curved surface. The inclination angle was 1 to 45 degrees. Further, the convex curved portions were formed in three directions at equal intervals from the shaft hole, or the convex curved portions were formed in four directions at equal intervals from the shaft hole.

  Then, the outer peripheral end of the rotating body forms a gentle wave-like curve that continuously varies in the vertical direction along the convex curved portion and the concave curved surface, and the outer peripheral end portion of the rotating body The rotation trajectory was a circle consisting of a gentle wave curve.

  According to the present invention, various types of cutting such as grass cutting, cutting under a forest, and small diameter trees are easy, and the cutting performance is high. In addition, the blade portion does not bite into the ground, grassland, etc., and further, the pebbles and the like are not rebounded, and the danger can be greatly reduced. In use, the brush cutter can be easily brushed by the above-described action only by moving the cutter blade mounted on the brush cutter lightly left and right on the brush target. In addition, since the position of the shaft hole serving as the center of rotation does not change, even if the rotation trajectory of the outer peripheral end portion of the rotating body is a gentle wave-like curve, vibration and vibration do not occur.

  Even when the cutting edge hits the curb or stone, the cutting edge is less likely to be damaged or worn, so that it can be used stably for a long time. In addition, since the balance of the cutting blade for a brush cutter is less likely to be out of order due to damage or wear of the cutting edge, the desired performance can be stably exhibited over a long period of time. Furthermore, since the mowing grass is mowed in a plurality of directions along the wave of the cutting edge, the mowing grass is less likely to be wound or entangled with the shaft of the brush cutter.

The top view which shows 1st Embodiment of the cutting blade for brush cutters concerning this invention. The front view. The rear view. AA sectional drawing of FIG. BB sectional drawing of FIG. The top view which shows 2nd Embodiment of the cutting blade for brush cutters concerning this invention. The front view. C arrow line view of FIG. DD sectional drawing of FIG. EE sectional drawing of FIG. The (a) top view of the conventional cutting blade for brush cutters, (b) Central cross-sectional view.

  Embodiments of a brush cutter for a brush cutter according to the present invention will be described below with reference to the drawings. 1 is a plan view showing a first embodiment of a brush cutter for a brush cutter according to the present invention, FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 4 is a cross-sectional view taken along line AA in FIG. It is BB sectional drawing of FIG. The cutting blade 1 for a brush cutter is composed of a disk-shaped rotating body 3 having a shaft hole 2 formed in the center, and a large number of cemented carbide chips (not shown) are brazed to the outer periphery at regular intervals. Or the blade part (not shown) is directly engraved.

  The cutting blade 1 for a brush cutter has convex curved portions 4a, 4b, 4c inclined at a predetermined angle θ (see FIG. 3) upward from the shaft hole 2 in a radial direction on one surface 3a of the rotating body 3 at equal intervals. It is formed in three directions. As shown in FIGS. 2 to 5, the tops of the convex curved portions 4 a, 4 b, 4 c are composed of gently curved surfaces having the same curvature. By connecting the convex curved portions 4a, 4b, and 4c with concave curved surfaces 5a, 5b, and 5c, a plurality of wave surfaces concentric with the shaft hole 2 are formed on one surface 3a of the rotating body 3. In addition, although the upper surface of the rotating body was used as one surface 3a of the rotating body 3 that forms the convex curved portions 4a, 4b, 4c, the lower surface may be used.

  The inclination angle θ from the shaft hole 2 of the convex curved portions 4a, 4b, and 4c shown in FIG. 3 is in the range of 1 to 45 degrees, and preferably in the range of 3 to 7 degrees. In the case of the brush cutter 1 having a diameter of about 255 mm, when the inclination angle θ is 5 degrees, the outer peripheral end 3 b of the convex curved portions 4 a, 4 b, 4 c is formed at a position about 7 mm higher than the shaft hole 2. . The angle θ is not particularly limited, and can be set at an arbitrary angle depending on the intended use.

  FIG. 6 is a plan view showing a second embodiment of a brush cutter for a brush cutter according to the present invention, FIG. 7 is a front view, FIG. 8 is a view taken along arrow C in FIG. 6, and FIG. 10 and 10 are sectional views taken along line EE in FIG. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The cutting blade 1 for a brush cutter has convex curved portions 6a, 6b, 6c, 6d that are inclined upward at a predetermined angle θ (see FIG. 7) in the radial direction from the shaft hole 2 on one surface 3a of the rotating body 3. It is formed in four directions at intervals. As shown in FIGS. 7 to 10, the tops of the convex curved portions 6a, 6b, 6c, and 6d are composed of gentle curved surfaces having the same curvature. By connecting the curved portions 6a, 6b, 6c, and 6d with concave curved surfaces 7a, 7b, 7c, and 7d, one surface 3a of the rotating body 3 is formed as a wave surface.

  The inclination angle θ of the convex curved portions 6a, 6b, 6c, and 6d shown in FIG. 7 from the shaft hole 2 is in the range of 1 to 45 degrees, and preferably in the range of 3 to 7 degrees. In the case of the brush cutter 1 having a diameter of about 255 mm, when the inclination angle θ is 5 degrees, the outer peripheral end 3 b of the convex curved portions 6 a, 6 b, 6 c, 6 d is formed at a position about 7 mm higher than the shaft hole 2. Is done. The angle θ is not particularly limited and can be set at an arbitrary angle.

  In the first embodiment, three convex curved portions 4a, 4b, 4c are adopted, and in the second embodiment, four convex curved portions 6a, 6b, 6c, 6d are adopted, but the number of convex curved portions is adopted. There is no limitation, and the number of the surface may be more than four, and a feature of the present invention is to form a plurality of wave surfaces.

  According to the first and second embodiments of the above configuration, the outer peripheral end 3b of the rotating body 3 includes the convex curved portions 4a, 4b, 4c (6a, 6b, 6c, 6d) and the concave curved surface 5a, A gentle wave-like curve is continuously formed along the positions 5b and 5c (7a, 7b, 7c, and 7d) so that the positions in the vertical direction are continuously different. For this reason, when mounted on a brush cutter and used, the rotation trajectory of the outer peripheral end portion 3b of the rotating body 3 is a circular shape having a gentle wave-like curve.

  When the brush cutter 1 having the above-described configuration is mounted on a brush cutter and rotated and used, the rotation locus of the outer peripheral end 3b of the rotating body 3 becomes a circular shape composed of a gentle wave-like curve, so that the cutting is performed. With respect to objects to be cut off such as grass, undergrass, and small diameter trees, the positions of the blades of the cutting blade 1 for a brush cutter are moved up and down so that they are sequentially lifted and moved in different positions. It will be mowing while.

  According to the present invention described above, various types of cutting such as mowing, undercutting of forests and small diameter trees are easy, and cutting performance is high. In addition, the blade portion does not bite into the ground, grassland, etc., and further, the pebbles and the like are not rebounded, and the danger can be greatly reduced. In use, the brush cutter can be easily brushed by the above-described action only by moving the cutter blade mounted on the brush cutter lightly left and right on the brush target. In addition, since the position of the shaft hole serving as the center of rotation does not change, even if the rotation trajectory of the outer peripheral end portion of the rotating body is a gentle wave-like curve, vibration and vibration do not occur.

  Even when the cutting edge hits the curb or stone, the cutting edge is less likely to be damaged or worn, so that it can be used stably for a long time. In addition, since the balance of the cutting blade for a brush cutter is less likely to be out of order due to damage or wear of the cutting edge, the desired performance can be stably exhibited over a long period of time. Furthermore, since the mowing grass is mowed in a plurality of directions along the wave of the cutting edge, the mowing grass is less likely to be wound or entangled with the shaft of the brush cutter.

DESCRIPTION OF SYMBOLS 1 ... Brush blade for brush cutter 2 ... Shaft hole 3 ... Rotating body 3a ... One side (of rotating body 3) 3b ... (Outside of rotating body 3) 4a, 4b, 4c, 6a, 6b, 6c, 6d ... Convex Concave curved surfaces 5a, 5b, 5c, 7a, 7b, 7c, 7d ... concave curved surface

Claims (7)

In the cutting blade for a brush cutter made of a disc-shaped rotating body with a shaft hole drilled in the center,
A cutting blade for a brush cutter, wherein a plurality of wave surfaces concentric with a shaft hole are formed on one surface of a rotating body.   2. A brush cutter according to claim 1, wherein a convex curved portion inclined at a predetermined angle upward from the shaft hole in a radial direction is formed, and the wave curved surface is formed by connecting the convex curved portions with a concave curved surface. Cutting blade.   The cutting blade for a brush cutter according to claim 2, wherein the inclination angle of the convex curved portion is 1 to 45 degrees.   The cutting blade for a brush cutter according to claim 2 or 3, wherein the convex curved portion is formed in three directions at equal intervals from the shaft hole.   The cutting blade for a brush cutter according to claim 2 or 3, wherein the convex curved portion is formed in four directions at equal intervals from the shaft hole.   6. The outer peripheral end of the rotating body forms a gentle wave-like curve having different vertical positions continuously along the convex curved portion and the concave curved surface. Cutting blade for brush cutter.   The cutting blade for a brush cutter according to claim 1, 2, 3, 4, 5 or 6, wherein the rotation locus of the outer peripheral end portion of the rotating body is a circular shape having a gentle wave-like curve.

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