JP3187237U - Rotary blade for weeding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary blade for weeding capable of improving the working efficiency of weeding work.
SOLUTION: A base portion 10 extending in a radial direction centering on a rotation axis L, and a plurality of blade portions 20 connected to the base portion 10 and formed so that a lower surface 21 extends in a plane orthogonal to the rotation axis L. And formed on the lower surface of the blade portion 20 so as to extend in a direction intersecting the circumferential direction centering on the rotation axis L, having a cross-sectional shape protruding downward, and arranged in a direction perpendicular to the rotation axis L. A plurality of sharpening blades 30.
[Selection] Figure 1

Description

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

  Conventionally, rotary blades for weeding are known (see, for example, Patent Document 1).

  This weeding rotary blade has a plurality of protrusions on one side of a plate having a mounting hole in the center. The plurality of protrusions extend in the rotation direction of the weeding rotary blade. As a result, weed the grass by scraping the ground in the same manner as mowing the grass.

Japanese Utility Model Publication No. 5-4831

  However, in the rotary blade for weeding described in Patent Document 1, since the plurality of protrusions draw a linear trajectory and scratch the work symmetry plane by the rotation of the rotary blade for weeding, the rotary blade for weeding and the work target surface There was a problem that the contact area was narrow and the working efficiency of the weeding work was poor.

  In order to solve the above problems, a rotary blade for weeding according to an aspect of the present invention is a rotary blade for weeding that is attached to a brush cutter and is driven to rotate around a rotation axis by a driving unit of the brush cutter, A base portion extending in a radial direction around the rotation axis, a plurality of blade portions connected to the base portion and formed such that a lower surface extends in a plane perpendicular to the rotation axis, and a lower surface of the blade portion A plurality of cutting blades formed so as to extend in a direction intersecting a circumferential direction centering on the rotation axis, having a cross-sectional shape protruding downward, and arranged in a direction perpendicular to the rotation axis. .

  According to this configuration, the contact area between the rotary blade for weeding and the work target surface can be expanded, and the working efficiency of the weeding work can be improved.

  The lower surface of the blade portion may be positioned below the lower surface of the base portion in the extending direction of the rotation axis.

  According to this configuration, the cutting blade and the work target surface can be brought into contact with each other more reliably.

  The cutting blade may be formed between a plurality of concave grooves recessed upward from the lower surface of the blade portion.

  According to this configuration, the configuration can be simplified, and the manufacturing is advantageous and the manufacturing cost is low.

  A cutting blade may be formed on a side edge of the blade portion on the rotational drive direction side of the mounting shaft.

  According to this configuration, it is possible to efficiently perform the weeding work on the work target surface on which weeds having relatively high height are grown.

  A protection having a circular outer peripheral edge extending in a circumferential direction centering on the rotational axis, and the outer peripheral edge positioned outside the base and the plurality of blades in a direction orthogonal to the rotational axis. A part may be further provided.

  According to this structure, it can prevent that the rotating blade part damages a crop.

  The protection part may be provided so as to cover the plurality of blade parts from above.

  According to this configuration, it is possible to prevent the pebbles that have jumped up from flying toward the worker.

  The present invention has an effect of improving the working efficiency of the weeding work.

It is a partially broken side view which shows the structural example of the front-end | tip part of the brush cutter which attached the rotary blade for weeding concerning embodiment of this invention. It is a disassembled perspective view which shows the structural example of the rotary blade for weeding of FIG. 1, and the front-end | tip part of a brush cutter.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited by the present embodiment. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

(Embodiment)
FIG. 1 is a partially broken side view showing a configuration example of a tip portion of a brush cutter 110 to which a rotary blade 100 for weeding according to an embodiment of the present invention is attached. FIG. 2 is an exploded perspective view showing a configuration example of the tip portions of the rotary blade 100 for weeding and the brush cutter 110 according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the rotary blade 100 for weeding according to the present embodiment is attached to the distal end portion of the brush cutter 110 and is used for, for example, weeding work on a field (work target surface).

  The brush cutter 110 is provided with a not-shown prime mover (drive unit) at the base end and a gear case 111 at the tip. The prime mover and the gear case 111 are connected by a hollow cylindrical rod 112. A transmission shaft (not shown) that is rotationally driven by a prime mover is provided inside the cage 112 so as to be rotatable with respect to the cage 112. In addition, a mounting shaft 113 connected to the distal end portion of the transmission shaft is provided inside the gear case 111 so as to be rotatable with respect to the gear case 111. And the protrusion part 114a which protrudes below from the center part of the upper surface side cover 114 is engage | inserted from the upper direction of the rotary blade 100 for weeding to the center hole 61 of the protective cover 2 mentioned later. Further, a protruding portion 115 a protruding upward from the center portion of the lower surface side cover 115 is fitted into the center hole 11 of the rotating blade body 1 described later from below the weeding rotary blade 100. And the center hole 11 of the rotary blade main body 1 mentioned later, the center hole 61 of the protective cover 2, the hole 114b formed in the center part of the upper surface side cover 114, and the hole 115b formed in the center part of the lower surface side cover 115. A bolt 116 having a washer 117 attached thereto is inserted therethrough and is screwed onto the mounting shaft 113, and the weeding rotary blade 100, the upper surface side cover 114 and the lower surface side cover 115 are fastened together. Accordingly, the weeding rotary blade 100 is fixed to the mounting shaft 113 in a state where the weeding rotary blade 100 is sandwiched between the upper surface side cover 114 and the lower surface side cover 115. Then, when the mounting shaft 113 is driven to rotate about the rotation axis L by the driving force of the prime mover, the weeding rotary blade 100 fixed to the mounting shaft 113 rotates about the rotation axis L in a predetermined rotation direction. Driven. Hereinafter, the rotation direction of the weeding rotary blade 100 may be referred to as a rotational drive direction. Since the brush cutter 110 is a known brush cutter, further description thereof is omitted. In the following description, the direction toward the ground when using the weeding rotary blade 100 is referred to as “down”, and the direction away from the ground is referred to as “up”.

  The weeding rotary blade 100 includes a rotary blade body 1 and a protective cover 2 disposed above the rotary blade body 1.

  The rotary blade body 1 is made of a steel plate having a stickiness such as a spring steel material. Accordingly, it is possible to prevent the rotary blade body 1 from coming into contact with a stone or the like during the weeding operation and the blade from being chipped.

  The rotary blade body 1 includes a base portion 10, a plurality of blade portions 20, a plurality of cutting blades 30 formed on the blade portion, and a cutting blade 50 formed on the blade portion.

  The base 10 is a plate body that extends in the radial direction about the rotation axis L. Hereinafter, a predetermined direction (left-right direction in FIG. 1) orthogonal to the extending direction of the rotation axis L is referred to as a first direction for convenience of explanation. For the convenience of explanation, the extending direction of the rotation axis L and the direction orthogonal to the first direction are referred to as a second direction. As shown in FIG. 2, both side edges 10 a of the base portion 10 are formed so as to swell outward in the second direction, that is, in a direction away from the rotation axis L.

  And the base 10 has the center hole 11 formed so that an upper surface and a lower surface may be connected to a center part, as shown in FIG.1 and FIG.2. The center hole 11 is formed on the rotation axis L and is configured to be fitted to the protruding portion 115 a of the lower surface side cover 115 of the brush cutter 110.

  Further, the base 10 has a pair of engagement holes 12 located on both sides in the first direction of the center hole 11. The pair of engagement holes 12 are configured to fit into engagement protrusions 62 of the protective cover 2 described later.

  The blade part 20 is provided so that a base end may be continued to the base part 10. Moreover, the front-end | tip of the blade part 20 is a free end. And the lower surface 21 of the blade part 20 is formed so that it may extend in the plane orthogonal to the rotating shaft L. As shown in FIG. In the present embodiment, two blade portions 20 are provided. The one blade portion 20 is provided so as to be connected to one end portion of the base portion 10 in the first direction via the connection portion 40. The other blade portion 20 is provided so as to be connected to the other end portion of the base portion 10 in the first direction via the connection portion 40. Therefore, when viewed from the extending direction of the rotation axis L, the one blade portion 20, the base portion 10, and the other blade portion 20 extend in a straight line in the first direction. Thus, since the two blade portions are provided at equal intervals, the center of gravity of the weeding rotary blade 100 can be easily positioned on the rotation axis L, and vibration during the weeding operation can be suppressed. .

  In addition, in this Embodiment, although the rotary blade 100 for weeding includes the two blade parts 20, it is not restricted to this, The three or more blade parts 20 may be provided.

  Further, the blade portion 20 is configured to be positioned below the lower surface 21 in the extending direction of the rotation axis L. And the connection part 40 is inclined and extended with respect to the 1st direction so that the base 10 and the blade part 20 may be connected.

  The distance between the lower surface 15 of the base portion 10 and the lower surface 21 of the blade portion 20 in the extending direction of the rotation axis L is configured to be equal to or greater than the height of the lower surface side cover 115 of the brush cutter 110. Has been. Therefore, the lower surface side cover 115 positioned below the rotary blade body 1 can be prevented from becoming an obstacle when the cutting blade 30 described later is brought into contact with the ground of the field during the weeding operation. 30 and the ground of a field can be contacted more reliably.

  Furthermore, in a state where the rotary blade 100 for weeding is attached to the brush cutter 110, the lower surface 21 of the blade portion 20 is a position where the lower end of the lower surface side cover 115 of the brush cutter 110 is located in the extending direction of the rotation axis L. Or it is comprised so that it may be located below this position. Accordingly, it is possible to prevent the lower surface side cover 115 protruding downward from the lower surface 21 of the blade portion 20 from coming into contact with the ground and damaging the lower surface side cover 115 during the weeding operation. In the present embodiment, as described above, the position of the lower surface 21 of the blade portion 20 in the extending direction of the rotation axis L is formed at the lower end position of the lower surface side cover 115 of the brush cutter 110. However, the present invention is not limited to this, and instead, the lower surface 21 of the blade portion 20 is positioned below the lower end position of the lower surface side cover 115 of the brush cutter 110 in the extending direction of the rotation axis L. You may comprise.

  A plurality of concave grooves 31 that are recessed upward from the lower surface 21 are formed on the lower surface 21 of each blade portion 20. These concave grooves 31 are continuously arranged in the first direction. The cross section of each groove 31 is formed in a substantially triangular shape. Therefore, a ridge having a substantially triangular cross-sectional shape protruding downward is formed between the groove 31 and the groove 31. This ridge constitutes the cutting blade 30. Note that the cross-sectional shape of the cutting blade 30 is not limited to a substantially triangular shape. Therefore, the cutting blades 30 are formed so as to be continuously arranged in the first direction. Further, the cutting blade 30 has one end located on one side edge of the lower surface 21 of the blade part 20 and extending in the second direction therefrom, and the other end located on the other side surface of the lower surface 21 of the blade part 20. . That is, the cutting blade 30 extends in a direction intersecting with the circumferential direction around the rotation axis L.

  When the cutting blade 30 configured as described above rotates about the rotation axis L, the cutting blade 30 draws a planar trajectory and scratches the work symmetry plane. Therefore, the contact area between the cutting blade 30 and the work target surface can be increased. Further, since the plurality of cutting blades 30 are provided so as to be aligned in the direction orthogonal to the rotation axis L, the contact area between the cutting blades 30 and the work target surface can be further expanded. Therefore, the working efficiency of the weeding work can be improved.

  As described above, the cutting blade 30 is formed by forming a plurality of concave grooves 31 having a substantially triangular cross-sectional shape recessed upward on the lower surface 21 of the blade portion 20. The configuration can be simplified, and the manufacturing is advantageous and the manufacturing cost is low.

  And as shown in FIG. 2, the blade part 20 has the cutting blade 50 formed in the side edge 20a by the side of a rotational drive direction. That is, the blade portion 20 is formed so that the upper surface 22 of the blade portion 20 approaches the lower surface 21 as it approaches the side edge 20a toward the rotational drive direction, and the side edge 20a constitutes a sharp cutting blade 50. ing.

  The protective cover 2 is made of resin. Thereby, for example, compared with the case where the protective cover 2 is made of stainless steel, the weight can be reduced, and the workability of the weeding work can be improved.

  And the protective cover 2 is formed in the inverted dish shape. That is, the protective cover 2 extends in a plane orthogonal to the rotation axis L, and the disc portion 60 formed in a disc shape and the base end portion are connected to the outer peripheral edge of the disc portion 60, and the outside downward from here And an annular portion 70 extending toward the center.

  The disc portion 60 is formed with a central hole 61 connecting the upper surface and the lower surface of the disc portion 60 at the center. The center hole 61 is formed on the rotation axis L and is configured to be fitted to the protruding portion 114 a of the upper surface side cover 114 of the brush cutter 110.

  In addition, a pair of engaging protrusions 62 that protrude downward from the lower surface of the disk part 60 are formed on both sides of the center hole 61 of the disk part 60 in the first direction. The pair of engaging protrusions 62 are configured to be fitted into the pair of engaging holes 12 as described above. Thus, when the pair of engagement protrusions 62 and the pair of engagement holes 12 are engaged, the protective cover 2 is fixed so as not to move relative to the rotary blade body 1 in a plane perpendicular to the rotation axis. Is done.

  Further, on both sides of the center hole 61 of the disc portion 60 in the second direction, a pair of projecting walls 63 projecting downward from the lower surface of the disc portion 60 and extending in the first direction are formed. The wall surface on the rotation axis L side (inner side) of the protruding wall 63 extends along the side edge 10a of the base 10 of the rotary blade body 1 in a state where the engagement protrusion 62 and the engagement hole 12 are engaged. It is formed to do. As a result, the protective cover 2 is held against the rotary blade body 1 so as not to be displaced in a plane perpendicular to the rotation axis. In particular, since both side edges 10a of the base 10 are formed so as to bulge outward in the second direction, they are held so as not to deviate in both the first direction and the second direction.

  In the present embodiment, as described above, the weeding rotary blade 100 engages the pair of engagement holes 12 of the rotary blade main body 1 and the pair of engagement protrusions 62 of the protective cover 2, and the rotary blade main body 1. It is assembled by engaging both side edges 10a of the base 10 and the pair of protruding walls 63 of the protective cover 2. However, the rotary blade main body 1 and the protective cover 2 may be fixed in advance with a bolt, an adhesive, or the like.

  The annular portion 70 is formed in a circular shape with the outer peripheral edge 71 extending in the circumferential direction centered on the rotation axis L. And the diameter of the outer periphery 71 is formed larger than the length dimension of the rotary blade main body 1, that is, the dimension from the tip of one blade part 20 to the tip of the other blade part 20. This prevents the crop abutting on the outer peripheral edge 71 from being caught on the outer peripheral edge 71 during the weeding operation, and can prevent the crop from being damaged or cut.

  Further, as described above, the protective cover 2 attached to the rotary blade body 1 is provided so as to cover the two blade portions 20 from above. As a result, pebbles and the like jumped upward by the blade portion 20 that rotates during the weeding operation come into contact with the protective cover 2 to prevent the pebbles and the like from hitting the worker.

[Example of use]
Next, the usage example of the rotary blade 100 for weeding is demonstrated.

  When weeding a field using the brush cutter 110 equipped with the weeding rotary blade 100, first, the weeding rotary blade 100 is rotated by the driving force of the prime mover. Then, the brush cutter 110 is supported so that the weeding rotary blade 100 is in a posture along the horizontal direction.

  Next, the lower surface 21 of the blade part 20 of the rotary blade 100 for weeding is applied to the ground of the field. Thereby, the cutting blade 30 formed on the lower surface 21 can scrape the ground, and weeds having relatively low height growing on the ground can be weeded. Furthermore, since the cutting blade 30 scrapes the ground and weeds the roots of the weeds, it is possible to make it difficult for the weeds to grow again after the weeding operation. Moreover, the cutting blade 50 of the blade part 20 can cut and weed relatively tall weeds.

  At this time, since the cutting blade 30 of the rotary blade 100 for weeding scratches the ground, pebbles and the like may be splashed upward by the rotary blade body 1 that rotates during the weeding operation, but the protective cover 2 has two blade portions. Since it is provided so as to cover 20 from above, the protective cover 2 prevents these pebbles from flying toward the user. Therefore, the user can use the rotary blade 100 for weeding more safely.

  Next, the brush cutter 110 is operated to move the weeding rotary blade 100 in the horizontal direction. At this time, when the weeding rotary blade 100 and the crop approach each other, the outer peripheral edge 71 of the protective cover 2 comes into contact with the crop, and the outer peripheral edge 71 of the protective cover 2 regulates the approach between the blade portion 20 and the crop. This can prevent the rotating blade 20 from damaging the crop.

  As described above, in the rotary blade 100 for weeding of the present invention, when the cutting blade 30 rotates around the rotation axis L, the cutting blade 30 draws a planar trajectory and scratches the work symmetry plane. Therefore, the contact area between the cutting blade 30 and the work target surface can be increased. Further, since the plurality of cutting blades 30 are provided so as to be aligned in the direction orthogonal to the rotation axis L, the contact area between the cutting blades 30 and the work target surface can be further expanded. Therefore, the working efficiency of the weeding work can be improved.

  From the above description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the foregoing description is to be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. Details of the structure and / or function may be substantially changed without departing from the spirit of the present invention.

  The present invention is useful for mowing work such as agriculture.

DESCRIPTION OF SYMBOLS 1 Rotating blade main body 2 Protective cover 10 Base part 10a Side edge 11 Center hole 12 Engagement hole 15 Lower surface 20 Blade part 20a Side edge 21 Lower surface 22 Upper surface 30 Cutting blade 31 Groove 40 Connection part 50 Cutting blade 60 Disc part 61 Center hole 62 engaging protrusion 63 protruding wall 70 annular portion 71 outer peripheral edge 100 rotary blade for weeding 110 brush cutter

Claims (6)

A rotary blade for weeding that is attached to a brush cutter and is driven to rotate about a rotation axis by a driving unit of the brush cutter,
A base extending radially about the axis of rotation;
A plurality of blade portions that are connected to the base portion and have a lower surface extending in a plane orthogonal to the rotation axis;
The lower surface of the blade portion is formed so as to extend in a direction intersecting with a circumferential direction centering on the rotation axis, has a cross-sectional shape protruding downward, and is arranged in a direction orthogonal to the rotation axis A rotary blade for weeding, comprising a cutting blade.   The rotary blade for weeding according to claim 1, wherein the lower surface of the blade portion is positioned below the lower surface of the base portion in the extending direction of the rotation axis.   The rotary blade for weeding according to claim 1 or 2, wherein the cutting blade is formed between a plurality of concave grooves recessed upward from a lower surface of the blade portion.   The rotary blade for weeding according to any one of claims 1 to 3, wherein a cutting blade is formed on a side edge of the blade portion on the rotational drive direction side of the mounting shaft.   A protection having a circular outer peripheral edge extending in a circumferential direction centering on the rotational axis, and the outer peripheral edge positioned outside the base and the plurality of blades in a direction orthogonal to the rotational axis. The rotary blade for weeding according to any one of claims 1 to 4, further comprising a section.   The rotary blade for weeding according to any one of claims 1 to 5, wherein the protection portion is provided so as to cover the plurality of blade portions from above.

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