JP3217662U - Rotary blade for weeding - Google Patents

Abstract

The present invention provides a rotary blade for weeding capable of preventing a reduction in sharpness over a long period of time.
A base 1 attached to a brush cutter and driven to rotate about a rotation axis L1 by a driving unit of the brush cutter, and a plurality of blade units 2 formed on an outer peripheral edge 12 of the base and arranged in the rotation direction. Each blade unit has a plurality of blades arranged in the rotation direction when viewed from the direction orthogonal to the rotation axis, and the rotation forward direction R1 side than the blade positioned closest to the rotation reverse direction R2 among the plurality of blades The blade located at is located on the radially inner side centering on the rotation axis with respect to the blade adjacent to the blade in the reverse rotation direction.
[Selection] Figure 2

Description

  The present invention relates to a rotary blade for weeding.

  Conventionally, a blade for a mower has been known (for example, see Patent Document 1).

  In this blade for mowers, a plurality of large blade portions having cutting edges are provided on the outer periphery of the mounting base portion that can be attached to the rotary shaft of the mower so as to extend radially outward at equal intervals in the circumferential direction. . Thereby, weeds etc. can be cut | disconnected with the cutting blade of a large sized blade part. Moreover, if the cutting edge of a large-sized blade part is worn out by long-term use, it can be used for a long time after polishing and repairing.

Japanese Utility Model Publication No. 7-30006

  However, the blade for the mower described in Patent Document 1 needs to prepare a separate tool for performing the polishing repair work, and may require a large amount of money to entrust the polishing repair work to an outsider, When the cutting edge is worn, there is a problem that it may be discarded in a short period of time and replaced by a new one without performing polishing repair work.

  In order to solve the above-described problem, a rotary blade for weeding according to an aspect of the present invention is attached to a brush cutter, and a base portion that is driven to rotate around a rotation axis by a driving portion of the brush cutter, and an outer peripheral edge of the base portion. A plurality of blade units formed and arranged in the rotation direction, each of the blade units having a plurality of blades arranged in the rotation direction when viewed from a direction orthogonal to the rotation axis, and among the plurality of blades The blade positioned on the rotation forward direction side of the blade positioned closest to the rotation reverse direction side is disposed radially inward with the rotation axis as the center than the blade adjacent to the rotation reverse direction side of the blade. Has been.

  According to this configuration, when wear of one blade among a plurality of blades of the blade unit proceeds by use, the blade tips of the blades adjacent to the rotation forward side of the blade gradually protrude, and the newly protruded blade Can cut weeds and the like. In this way, since the blade tips of the blades adjacent to the worn blade in the forward rotation direction protrude in order, the sharpness can be prevented from being lowered for a long period of time.

  The plurality of blades may be arranged in a straight line, and each of the blades may be formed in a tapered shape that becomes thinner from the inner side toward the outer side in the radial direction around the rotation axis.

  According to this structure, the sharpness of the blade of each blade unit can be easily improved.

  A plurality of guide portions disposed between adjacent blade units among the plurality of blade units are further provided, and each guide portion is formed on an outer peripheral edge of the base portion and viewed from a direction orthogonal to the rotation axis. A first inclined portion extending in the reverse direction of rotation and extending obliquely inward in a radial direction centered on the rotation axis, and an end of the first inclined portion on the rotation reverse direction side, A second inclined portion extending in the opposite direction of rotation when viewed from the direction orthogonal to the rotation axis and extending inward in a radial direction centered on the rotation axis. An inclination angle with respect to a circumferential direction around the rotation axis may be larger than an inclination angle of the first inclined portion with respect to the circumferential direction around the rotation axis.

  According to this configuration, it is possible to effectively reduce jumping of pebbles and the like during weeding work.

  Each of the blades extends in the forward rotation direction when viewed from a direction orthogonal to the rotation axis and extends outward in a radial direction centered on the rotation axis, and the rotation axis from the tip of the back portion. A contact portion extending inward in the radial direction of the center, and the back portion and the contact portion of the blade located closest to the rotation forward direction among the plurality of blades of each blade unit. The angle of the corner may be configured to be larger than the angle formed by the back portion and the contact portion of the other blades of the plurality of blades.

  According to this configuration, it is possible to prevent the base from being damaged.

  Of the plurality of blades of each of the blade units, a blade positioned closest to the rotation direction side may be disposed on a radially outer side centering on the rotation axis than the guide portion.

  According to this structure, a blade, weeds, etc. can be contacted more reliably and the working efficiency of a weeding operation can be improved.

  The present invention has an effect that the sharpness can be prevented from being lowered over a long period of time.

It is a perspective view which shows the structural example of the brush cutter which mounted | wore with the rotary blade for weeding based on Embodiment 1 of this invention. It is a bottom view which shows the structural example of the rotary blade for weeding of FIG. It is a principal part enlarged plan view which shows the structural example of the rotary blade for weeding of FIG. It is a top view which shows the structural example of the rotary blade for weeding based on Embodiment 2 of this invention. It is a top view which shows the structural example of the rotary blade for weeding based on Embodiment 3 of this invention.

  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 1)
FIG. 1 is a perspective view showing a configuration example of a brush cutter 110 equipped with a rotary blade 100 for weeding according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the rotary blade 100 for weeding of this Embodiment is attached to the front-end | tip part of the brush cutter 110, for example, is used for the weeding work of a field (work object surface).

  The brush cutter 110 is provided with a drive unit (not shown) at the base end and a gear case 111 at the tip. The drive unit and the gear case 111 are connected by a hollow cylindrical flange 112. A transmission shaft (not shown) that is rotationally driven by the drive unit is provided inside the collar 112 so as to be rotatable with respect to the collar 112. In addition, a mounting shaft (not shown) 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. The weeding rotary blade 100 is fixed to the mounting shaft via the attachment member 113. Then, when the mounting shaft is driven to rotate about the rotation axis L by the driving force of the drive unit, the weeding rotary blade 100 fixed to the mounting shaft is driven to rotate about the rotation axis L in a predetermined rotation direction. Is done. Hereinafter, the rotation direction when the weeding rotary blade 100 is rotationally driven by the brush cutter 110 may be referred to as a rotation forward direction R1, and the direction opposite to the rotation forward direction may be referred to as a rotation reverse direction R2. Moreover, below, the direction which goes to the ground at the time of use of the rotary blade 100 for weeding may be referred to as “down”, and the direction away from the ground may be referred to as “up”. Since the brush cutter 110 is a known brush cutter, further description thereof is omitted.

  FIG. 2 is a bottom view illustrating a configuration example of the weeding rotary blade 100.

  As shown in FIG. 2, the weeding rotary blade 100 includes a base 1 and a plurality of blade units 2. Further, the weeding rotary blade 100 has a plurality of guide portions 3 arranged between adjacent blade units 2 among the plurality of blade units 2.

  The base 1 is attached to the brush cutter 110 and is driven to rotate about the rotation axis L by the driving unit of the brush cutter 110.

  In the present embodiment, the base portion 1 is formed in a substantially disc shape, for example. The base 1 is formed with a central hole 11 connecting the upper surface and the lower surface at the center. The center hole 11 is formed on the rotation axis L. The center hole 11 is a hole in which the attachment member 113 is mounted.

  The plurality of blade units 2 are formed on the outer peripheral edge 12 of the base 1 and are arranged in the rotation direction.

  In the present embodiment, for example, eight blade units 2 are formed, and are arranged at equal intervals on the outer peripheral edge 12 of the base 1. That is, the eight blade units 2 are formed at positions that are rotationally symmetric every 45 degrees around the rotation axis L.

  FIG. 3 is an enlarged plan view of a main part showing a configuration example of the weeding rotary blade 100.

  As shown in FIG. 3, each blade unit 2 has a plurality of blades arranged in the rotation direction when viewed from the direction orthogonal to the rotation axis L. That is, the plurality of blades are provided in a row on the outer peripheral edge 12. In the present embodiment, five blades, for example, 21A to 21E are formed.

  And in each blade unit 2, blade 21B-21E located in the rotation forward direction R1 side rather than blade 21A located in the rotation reverse direction R2 side among several blades 21A-21E from the blade adjacent to this blade. Is also arranged on the inside in the radial direction with the rotation axis L as the center. That is, the blade 21B is disposed radially inward with the rotational axis L as the center from the blade 21A, the blade 21C is disposed radially inward with the rotational axis L as the center from the blade 21B, and the blade 21D is disposed in the blade. The blade 21E is disposed radially inward with the rotation axis L as the center from the blade 21D, and is disposed radially inward with the rotation axis L as the center from 21C.

  These five blades 21A to 21E are arranged in a straight line. In the present embodiment, the blades 21 </ b> A to 21 </ b> E are arranged so as to be aligned on a virtual straight line D.

  Each blade 21 </ b> A to 21 </ b> E has a back portion 22 and a contact portion 23.

  The back portion 22 extends in the rotation forward direction R1 when viewed from the direction orthogonal to the rotation axis L, and extends outward in the radial direction centering on the rotation axis L. That is, the back portion 22 is provided to be inclined toward the outer side in the forward rotation direction along the outer peripheral edge 12.

  The contact portion 23 extends from the tip of the back portion 22 inward in the radial direction centered on the rotation axis L. The angle formed by the distal end of the back portion 22 and the proximal end of the contact portion 23 constitutes the cutting edge 24 of the blades 21A to 21E. Therefore, the blades 21A to 21E are formed in a triangular shape, and the plurality of blades 21A to 21E of each blade unit 2 are formed in a saw blade shape as a whole.

  Of the plurality of blades 21A to 21E of each blade unit 2, the angle θ5 formed by the back portion 22 and the contact portion 23 of the blade 21E located closest to the rotation forward direction R1 is the angle of the other blades 21B to 21E. It is formed larger than the angles θ1 to θ4 formed by the back portion 22 and the contact portion 23.

  Each of the blades 21A to 21E is formed in a tapered shape that becomes thinner from the inside toward the outside in the radial direction with the rotation axis L as the center. That is, the upper surfaces of the blades 21A to 21E extend in the horizontal direction and are formed flat. Further, the lower surfaces of the blades 21A to 21E are inclined so as to approach the upper surface from the inner side toward the outer side in the radial direction centering on the rotation axis L. Thereby, the blade edge | tip 24 of blade 21A-21E can be made thin, and the sharpness of blade 21A-21E can be improved. Further, at the time of manufacturing, the cutting edges 24 of the blades 21A to 21E can be easily processed to be thin, which is advantageous for manufacturing. In addition, you may comprise so that the upper surface of blade 21A-21E may incline so that it may approach toward a lower surface, as it goes to inner side from the inner side in the radial direction centering on the rotating shaft L.

  As shown in FIG. 2, the plurality of guide portions 3 are formed on the corresponding forward rotation direction R <b> 1 side of each blade unit 2, and eight guide portions 3 are formed. That is, the eight guide portions 3 are formed at positions that are rotationally symmetric every 45 degrees around the rotation axis L. And as shown in FIG. 3, the guide part 3 guides weeds etc. toward the blade unit 2 at the time of use so that it may mention later. The guide part 3 includes a first inclined part 31 and a second inclined part 32.

  The first inclined portion 31 is formed on the outer peripheral edge 12 of the base portion 1, extends in the rotation reverse direction R <b> 2 when viewed from the direction orthogonal to the rotation axis L, and faces inward in the radial direction centered on the rotation axis L. Inclined and distracted. The second inclined portion 32 is connected to the end of the first inclined portion 31 on the rotation reverse direction R2 side, extends in the rotation reverse direction R2 when viewed from the direction orthogonal to the rotation axis L, and is centered on the rotation axis L. Inclined and extended inward in the radial direction. That is, the first inclined portion 31 and the second inclined portion 32 are provided so as to be inclined toward the inner side in the rotation reverse direction along the outer peripheral edge 12. The inclination angle θb with respect to the circumferential direction around the rotation axis L of the second inclined portion 32 is formed larger than the inclination angle θa with respect to the circumferential direction around the rotation axis L of the first inclined portion 31. Yes.

  Of the plurality of blades 21A to 21E of each blade unit 2, the angle θ5 formed by the back portion 22 and the contact portion 23 of the blade 21E located closest to the rotation forward direction R1 is the angle of the other blades 21B to 21E. It is formed larger than the angles θ1 to θ4 formed by the back portion 22 and the contact portion 23. Accordingly, the contact portion 23 of the blade 21E and the second inclined portion 32 can be connected by an arcuate surface having a large radius of curvature, so that the connection portion between the contact portion 23 of the blade 21E and the second inclined portion 32 is connected. Stress concentration can be relaxed. Thereby, the intensity | strength of the rotary blade 100 for weeding can be raised.

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

  First, the weeding rotary blade 100 is mounted on the brush cutter 110, and the weeding rotary blade 100 is rotated in the rotation forward direction R1.

  Then, weeding work is performed while pressing the weeding rotary blade 100 against weeds or the like. Since the weeding rotary blade 100 rotates at a high speed, most of the weeds that come into contact with the weeding rotary blade 100 enter the plurality of blades of the blade unit 2 before entering inward in the radial direction centering on the rotation axis L. Of 21A to 21E, the blade 21A located on the radially outer side centering on the rotation axis L is contacted and cut.

  Further, when the weeding operation is performed while pressing the weed rotary blade 100 against the weeds or the like, the relatively inclined cutting object such as the weeds has the first inclined portion 31 extending in the circumferential direction around the rotation axis L. In the existing area A1, it is pressed against the first inclined portion 31 in a bent state and moves on the first inclined portion 31. Thereafter, in the region A2 in which the second inclined portion 32 extends in the circumferential direction around the rotation axis L, the cutting object is centered on the rotation axis L due to the repulsive force generated by the cutting object being bent. Quickly enters the radial inner side and moves on the second inclined portion 32. Then, the cutting object that has entered deep inside in the radial direction centering on the rotation axis L comes into contact with the contact portion 23 of the blades 21A to 21E and is cut.

  On the other hand, relatively hard obstacles such as wood and stone move on the first inclined portion 31 in the region A1 in which the first inclined portion 31 extends in the circumferential direction around the rotation axis L. Thereafter, in the region A2 in which the second inclined portion 32 extends in the circumferential direction centered on the rotation axis L, the obstacles immediately enter the blades 21A to 21E before entering the radial inside centered on the rotation axis L. Contact the contact portion 23. That is, a relatively hard obstacle such as wood or stone does not move on the second inclined portion 32 but moves on the extension line of the first inclined portion 31 and contacts the contact portion 23 of the blades 21A to 21E. Therefore, an obstacle can penetrate deeply inward in the radial direction centering on the rotation axis L, and for example, an obstacle that contacts the contact portion 23 of the blade 21E can be reduced.

  Thus, by the guide part 3 having the first inclined part 31 and the second inclined part 32, a relatively hard obstacle such as wood, stone or the like deeply enters inward in the radial direction around the rotation axis L, for example, the blade 21E. Obstacles that come into contact with the hitting portion 23 are reduced, whereby the jumping of these obstacles can be effectively reduced.

  And as above-mentioned, many of the weeds etc. which contact the rotary blade 100 for weeding are in the blade 21A located in the radial direction outermost centering on the rotating shaft L among the some blades 21A-21E of the blade unit 2. In order to contact, usually, it wears in order from blade 21A. When the blade 21A is worn, the cutting edge 24 of the blade 21A shrinks radially inward with the rotation axis L as the center. Thereby, in the radial direction centering on the rotation axis L, the step with the blade edge 24 of the adjacent blade 21B is gradually reduced and protrudes. And the weeds etc. which contact the rotary blade 100 for weeding come to contact the blade 21B. As a result, when the blade 21A is worn, the blade 21B cuts weeds and the like instead, so that the sharpness of the rotary blade 100 for weeding can be prevented from being lowered. In this way, even when the wear of the blade unit 2 proceeds, the cutting edge of the blade 21E from the blade 21A sequentially protrudes radially outward centered on the rotation axis L, so that the sharpness of the rotary blade 100 for weeding is reduced. Can be prevented over a long period of time.

  As described above, the rotary blade 100 for herbicidal use according to the present invention is used when the wear of one blade among the plurality of blades 21A to 21E of the blade unit 2 progresses in the forward rotation direction R1 side of the blade. The blade edge 24 adjacent to the blade gradually protrudes, and weeds and the like can be cut by this blade. Thus, since the blade edge 24 of the blade adjacent to the rotation direction R1 side of the worn blade protrudes in order, the sharpness can be prevented from being lowered for a long period of time.

(Embodiment 2)
FIG. 4 is a diagram illustrating a configuration example of the weeding rotary blade 200 according to the second embodiment.

  As shown in FIG. 4, in the present embodiment, the weeding rotary blade 200 has a cutting blade 204 disposed between each guide portion 3 and the blade unit 2 positioned on the rotation forward direction R1 side of the guide portion 3. It is installed. The cutting blade 204 extends in the radial direction on the rotation axis L.

(Embodiment 3)
FIG. 5 is a diagram illustrating a configuration example of the weeding rotary blade 300 according to the third embodiment.

  As shown in FIG. 5, in this embodiment, the rotary blade 300 for weeding includes a cemented carbide tip 304 between each guide portion 3 and the blade unit 2 located on the rotation forward direction R1 side of the guide portion 3. It is arranged.

  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.

L Rotation axis R1 Rotation forward direction R2 Rotation reverse direction 1 Base 2 Blade unit 3 Guide part 11 Center hole 12 Outer peripheral edge 21 Blade 22 Back part 23 Contact part 24 Cutting edge 31 First inclined part 32 Second inclined part 100 Rotary blade for weeding 110 Brush cutter

Claims (5)

A base attached to the brush cutter and driven to rotate about a rotation axis by a driving unit of the brush cutter;
A plurality of blade units formed on the outer peripheral edge of the base portion and arranged in the rotation direction,
Each of the blade units has a plurality of blades arranged in the rotation direction when viewed from a direction orthogonal to the rotation axis, and the rotation forward direction side of the blades that are positioned closest to the rotation reverse direction among the plurality of blades The blade located at is a rotary blade for weeding, which is disposed radially inward with the rotation axis as a center with respect to the blade adjacent to the blade in the reverse rotation direction.   2. The weeding according to claim 1, wherein the plurality of blades are arranged in a straight line, and each of the blades is formed in a tapered shape that becomes thinner from the inside toward the outside in a radial direction centering on the rotation axis. Rotating blade. A plurality of guide portions disposed between adjacent blade units among the plurality of blade units;
Each of the guide portions is formed on the outer peripheral edge of the base portion, extends in the direction opposite to the rotation when viewed from the direction orthogonal to the rotation axis, and inclines toward the inside in the radial direction around the rotation axis. In the radial direction centered on the rotation axis and extending in the rotation reverse direction when viewed from the direction orthogonal to the rotation axis. A second inclined portion that inclines and extends inward, and an inclination angle of the second inclined portion with respect to a circumferential direction centering on the rotation axis is the rotation axis of the first inclined portion. The rotary blade for weeding according to claim 1 or 2, wherein the rotary blade is larger than an inclination angle with respect to a circumferential direction as a center. Each of the blades extends in the forward rotation direction when viewed from a direction orthogonal to the rotation axis and extends outward in a radial direction centered on the rotation axis, and the rotation axis from the tip of the back portion. A contact portion extending inward in the radial direction of the center,
The angle of the angle formed by the back portion and the contact portion of the blade located closest to the rotation forward direction side among the plurality of blades of each blade unit is determined by the back portion of the other blades of the plurality of blades and the The rotary blade for weeding according to claim 3, wherein the rotary blade is larger than an angle formed by the contact portion.   The blade located closest to the rotation reverse direction among the plurality of blades of each blade unit is disposed on the radially outer side centering on the rotation axis with respect to the guide portion. The rotary blade for weeding described.

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