JP2016013119A - Herbicidal cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a herbicidal cutter that has high versatility and that hardly gives damage to farm crops and the like.SOLUTION: A herbicidal cutter 10 is for cutting weeds by connecting to a rotation output part 69 of a rotary driving device, including a cutter body 20, a cover 30 for covering the cutter body from above, and a fastener 40 for fastening the cutter body 20 and the cover 30 to the rotation output part 69. The cover 30 comprises: a part to be fastened 32 which is fastened to the rotation output part 69 together with the cutter body 20; a cover body 34 which is arranged on the outside in the rotation radial direction and which has an outer peripheral surface for preventing the cutter body 20 from coming into contact with an object other than herbicidal targets by being positioned further outer side from the end in the outside of the rotation radial direction of the cutter body 20; and a bearing 36 which allows relative rotation of the part 32 to be fastened and the cover body 34.

Description

  The present invention relates to a cutter that is connected to a rotary drive device such as a main body of a brush cutter and performs cutting for weeding.

  Conventionally, as a means for performing weeding, for example, a brush cutter described in Patent Document 1 is known. This brush cutter has a brush cutter body including an engine and the like, and a rotary blade mounted on the brush cutter, which cuts grass while being driven to rotate at high speed by the brush cutter body.

JP 2011-87549 A

  The brush cutter has the following problems to be solved.

  First, the rotary blade included in the brush cutter has low versatility. That is, the rotary blade is used as a set with the brush cutter body, and is not used by being connected to another rotary drive device. In the market, it is required to provide a versatile weeding cutter capable of exerting herbicidal action by being connected to various rotary drive devices, and responding to the demand is an important issue. Yes.

  Further, as another problem, when the brush cutter is used for weeding in farmland such as a field or a rice field, there is a risk that the rotary blade may accidentally come into contact with the crop to damage the crop. As a means for avoiding this, it may be possible to prevent the contact between the rotary blade and the crop by attaching a cover that guards the rotary blade from the outside in the radial direction of rotation to the brush cutter body. Apart from the blade, the cover must also be attached to the main body of the brush cutter, and versatility is further reduced.

  In view of such circumstances, the present invention is a weeding cutter capable of performing a weeding action by being connected to a rotary drive device, and has a high versatility while erroneously performing a weeding operation. An object of the present invention is to provide a product that can prevent damage to a non-weeding object such as a crop.

  The present invention provides a weeding cutter that performs a weeding operation for cutting grass by being connected to the rotation output unit of a rotary drive device having a rotation output unit. The weeding cutter includes a cutter body having a cutting blade portion capable of cutting the grass by contacting the grass while rotating, a cover that covers the cutter body from the upper side in the rotational radius direction, and the cutter. And a fastener that detachably fastens the cutter body and the cover to the rotation output unit by being coupled to the rotation output unit while passing through the body and the cover while overlapping each other. The cover has a shape surrounding an insertion hole through which the fastener can be inserted, and a fastening portion fastened to the rotation output portion together with the cutter body by the fastener, and an outer side in a rotational radius direction of the fastening portion And a cover body having an outer peripheral surface that prevents the cutter body from coming into contact with an object other than the weeding target by being located further outside than the end of the cutter body in the rotational radius direction, A bearing that is interposed between the fastened portion and the cover main body and allows relative rotation between the two.

  According to this weeding cutter, the outer peripheral surface of the cover body of the cover that covers the cutter body from the upper side is located further outside the outer end of the cutter body, and the cutter body and an object not to be weeded (for example, crops) ; Hereinafter referred to as “non-object”), the herbicidal operation can be easily proceeded without damaging the non-object. In addition, since the cutter body and the cover are fastened to the rotation output portion of the rotary drive device by a common fastener that passes through them, the cutter body and the cover can be easily mounted on various rotary drive devices. Is expensive.

  Further, the cover includes a fastened part, a cover main body, and a bearing, and the bearing is a cover main body with respect to the fastened part in a state where the fastened part is fastened together with the cutter main body to the rotation output part of the rotary drive device. Therefore, it is possible to prevent the cover main body from rotating together with the cutter main body and the fastened portion, so that when the cover main body comes into contact with the non-object, It is possible to effectively prevent the object from being damaged.

  The cutter body preferably has a plurality of blades extending radially from the center of rotation toward the outer side in the radial direction of rotation, and each blade has a cutting blade located at the front edge in the rotational direction. It is. In this cutter body, it is possible to form a sufficient space for receiving grass between each blade, so that it is difficult to cause clogging of the grass, and weeding can proceed smoothly.

  More preferably, each blade of the cutter body has the cutting blade portions on both side edges in the rotational direction. The cutter main body having such a so-called double-edged blade can perform weeding even if it is rotationally driven in any direction, so that versatility is further enhanced.

  The cover main body is a rotation blocking unit that prevents relative rotation of the cover main body with respect to the rotation driving device by contacting the rotation driving device with the fastened portion fastened to the rotation output unit of the rotation driving device. It is preferable to have The rotation preventing portion rotates even when the rotation resistance of the bearing of the cover is relatively large, that is, even when the bearing has a relatively low ability to allow relative rotation of the cover body with respect to the fastened portion. By using the drive device itself, it is possible to more reliably prevent the cover body from being rotated with the fastened portion.

  The weeding cutter according to the present invention may further include a relay member connected to the rotation output unit of the rotation drive device. In this case, the fastener is configured to fasten the cutter body and the cover to be fastened to the relay member, so that the cutter main body and the cover body to be fastened are connected to the rotation output portion via the relay member. Can be fastened.

  As described above, according to the present invention, it is a weeding cutter capable of performing a weeding action by being connected to a rotary drive device, and has a high versatility while erroneously performing a weeding operation. What can be effectively deterred from damaging non-weeding objects such as crops is provided.

It is a perspective view which shows the example with which the weeding cutter which concerns on the 1st Embodiment of this invention was mounted | worn with the main body of the brush cutter as a rotation drive device. FIG. 2 is an assembled cross-sectional front view of the weeding cutter in the example shown in FIG. 1. It is a disassembled perspective view of the said weeding cutter in the example shown in FIG. It is a top view of the cutter main body of the said weeding cutter. It is sectional drawing along the VV line of FIG. It is an assembly cross-sectional front view which shows the example with which the said weeding cutter was mounted | worn with the main body of the disk grinder as a rotation drive device. It is a disassembled perspective view of the said weeding cutter in the example shown in FIG. It is a top view which shows the 1st modification about the shape of the cutter main body in the said weeding cutter. It is a top view which shows the 2nd modification about the shape of the cutter main body in the said weeding cutter. It is an assembly cross-sectional front view of the weeding cutter according to the second embodiment of the present invention. It is an assembly bottom view of the weeding cutter which concerns on the 2nd Embodiment of this invention. It is an assembly sectional front view of the weeding cutter concerning a 3rd embodiment of the present invention. It is an assembly cross-sectional front view which shows the 4th Embodiment of this invention. It is an assembly sectional front view showing a 5th embodiment of the present invention.

  Preferred embodiments of the present invention will be described with reference to the drawings.

  1 to 7 show a weeding cutter 10 according to an embodiment of the present invention. The weeding cutter 10 is connected to and driven by the rotation output shaft of the rotation driving device to perform a weeding operation for cutting grass. FIGS. 1 to 4 illustrate a brush cutter body 60 as the rotation driving device. 6 and 7 show examples in which the main body 70 of the disk grinder is used as the rotational drive device. Thus, the weeding cutter 10 can be used by being mounted on either the brush cutter body 60 or the disc grinder body 70, and has high versatility.

  A brush cutter main body 60 shown in FIG. 1 includes a main body shaft 62 extending in one direction, an operation handle 64 provided at an intermediate portion of the main body shaft 62, and a prime mover 66 provided at the upper end of the main body shaft 62. And a brush cutter head 68 provided at the lower end of the main body shaft 62. The main body shaft 62 incorporates a mechanism for transmitting the power generated by the prime mover 66 to the brush cutter head 68. The brush cutter head 68 includes a rotation output shaft 69 shown in FIG. 2 and a transmission mechanism (not shown) that transmits the transmitted power to the rotation output shaft 69 to rotate the rotation output shaft 69.

  As shown in FIGS. 2 and 3, the weeding cutter 10 includes a cutter body 20 that performs cutting for weeding, a cover 30 that guards the cutter body 20, and the cutter body 20 and the cover 30. And a fastener 40 fastened to the rotation output shaft 69 of the brush cutter body 60.

  The cutter body 20 is formed of a suitable metal material or other hard material, for example, tool steel, and is fastened to the rotary output shaft 69 by being fastened integrally with the rotary output shaft 69. It has a shape capable of cutting the grass in contact with the cutter body 20. Specifically, as shown in FIG. 4, the cutter body 20 integrally includes a boss portion 22 and a plurality of blades 24, and has a plate shape as a whole.

  The boss portion 22 has an annular shape and surrounds a circular insertion hole 23 that allows the fastener 40 to pass therethrough. The boss 22 is fastened to the rotary output shaft 69 by the fastener 40 together with the cover 30.

  Each blade 24 has a shape extending radially outward from the boss portion 22 in the rotational radius direction. In the cutter body 20 according to this embodiment, each blade 24 extends linearly outward from two positions spaced apart from each other by 180 ° in the circumferential direction in the boss portion 22.

  Each of the blades 24 has a cutting blade portion 26 at each edge portion in the rotational direction. These cutting blade portions 26 have a shape capable of cutting the grass by contacting the grass when the cutter body 20 rotates. Specifically, as shown in FIG. 5, each cutting blade portion 26 according to this embodiment becomes lower on the upper surface of the blade 24 at both edges in the rotational direction as the upper surface approaches the tip (that is, the blade 24). It is formed by giving a taper.

  The cover 30 is a member that covers the cutter body 20 from above, and includes a boss portion 32 that is a fastening portion, a cover body 34, and a bearing 36.

  The boss part 32 is a part fastened to the rotary output shaft 69 together with the boss part 22 of the cutter body 20 by the fastener 40. The boss portion 32 has a substantially cylindrical shape, and surrounds a circular insertion hole 33 that allows the fastener 40 to be inserted, like the boss portion 22. The boss portion 32 according to this embodiment has an inner diameter that is substantially the same as the inner diameter of the boss portion 22. That is, the diameter of the insertion hole 33 surrounded by the boss portion 32 and the diameter of the insertion hole 23 surrounded by the boss portion 22 are substantially the same.

  The inner diameter of the upper end portion of the boss portion 32 according to this embodiment is slightly smaller than the diameter of the insertion hole 33. This is for centering by fitting between the boss portion 32 and the protruding portion 68a on the lower surface of the brush cutter head 68. If there is another portion that can be centered, the setting of the inner diameter is not essential. .

  The cover body 34 is positioned outside the boss portion 32 in the rotational radius direction and has a shape that guards the cutter body 22 from the outside and the upper side in the rotational radius direction. Specifically, the cover main body 34 according to this embodiment integrally includes a base portion 34a, a top wall 34b, and a peripheral wall 34c. The base portion 34 a has a substantially cylindrical shape arranged in parallel with the boss portion 32, and has an inner diameter larger than the outer diameter of the boss portion 32. The top wall 34b extends outward in the rotational radius direction from the upper end of the base portion 34a, and the boss portions 22 and 32 are both fastened to the rotational output shaft 69 (hereinafter referred to as “mounted state”). It forms a donut plate shape that guards the cutter body 20 from above. The peripheral wall 34c is an outer peripheral portion that extends substantially downward from the outer peripheral edge of the top wall 34b, and has an outer peripheral surface that is positioned further outward than an outer end portion in the rotational radius direction of the cutter body 20 in the mounted state. . That is, the outer diameter of the peripheral wall 34 c is larger than the diameter of the circumscribed circle of the cutter body 20.

  The lower end position of the peripheral wall 34 c is slightly above the upper surface of the cutter body 20. The relative position is set so as to prevent the cutter body 20 from coming into contact with other non-objects, that is, non-weeding objects (for example, crops) while allowing the cutter body 20 to cut the grass. Is done.

  The bearing 36 is interposed between the boss part 32 and the cover body 34 so as to allow the relative rotation of the cover body 34 with respect to the boss part 32 in addition to connecting the boss part 32 and the cover body 34 to each other. Specifically, the bearing 36 according to this embodiment includes an inner ring 36a fixed on the outer peripheral surface of the boss portion 32, an outer ring 36b fixed on the inner peripheral surface of the base portion 34a of the cover body 34, A rolling element (for example, a hard ball or a roller) 36c interposed between the inner ring 36a and the outer ring 36b. The rolling element 36c allows relative rotation of the outer ring 36b and the base part 34a with respect to the inner ring 36a and the boss part 32. Roll to do.

  The cover main body 34 according to this embodiment further includes a rotation preventing portion 38. The rotation preventing portion 38 protrudes upward from an appropriate position of the cover main body 34 (the top wall 34b in the examples shown in FIGS. 2 and 3), and is cut in an appropriate portion of the rotation drive device (in the examples shown in FIGS. 2 and 3). By abutting against the side surface of the dispenser head 68, relative rotation of the cover main body 34 with respect to the rotational drive device is prevented. The rotation preventing portion 38 illustrated in FIG. 2 includes a bolt 38a that passes through the top wall 34b upward, and a nut 38b that is attached to the bolt 38a to fix the bolt 38a.

  The fastener 40 is coupled (screwed and tightened) to the rotation output shaft 69 while being inserted into the insertion holes 23 and 33 surrounded by the boss portions 22 and 32, whereby the boss portions 22 and 32 are connected. These are fastened to the rotation output shaft 69 in a state where they overlap in the axial direction.

  Specifically, the fastener 40 according to this embodiment includes a bolt 42, a pressing member 44, and a flat washer 46.

  The bolt 42 has a screw shaft portion 42a and a head portion 42b having a larger diameter. The screw shaft portion 42a has an outer peripheral surface on which a male screw is formed. The outer diameter of the screw shaft portion 42a is set to a diameter that can be screwed into the screw hole 69a formed in the rotation output shaft 69 as shown in FIG.

  The presser member 44 is used to sandwich the boss portions 22 and 32 between the presser member 44 and the brush cutter head 68 as the bolt 42 is screwed into the screw hole 69a of the rotation output shaft 69. It is a member.

  Specifically, the pressing member 44 integrally includes a first cylindrical portion 44a, a second cylindrical portion 44b, and a pressing portion 44c in order from the top in the mounted state. The first and second cylindrical portions 44a and 44b have the same outer diameter, specifically, outer diameters that can be fitted inside the boss portions 22 and 32 with almost no gap, but have different inner diameters. Have. The inner diameter of the first cylindrical portion 44 a is larger than the outer diameter of the screw shaft portion 42 a of the bolt 42 and smaller than the outer diameter of the flat washer 46. The inner diameter of the second cylindrical portion 44 b is slightly larger than the outer diameter of the flat washer 46. The pressing portion 44c protrudes in a bowl shape outwardly in the radial direction of rotation from the outer peripheral surface of the second cylindrical portion 44b further below the second cylindrical portion 44b.

  The presser member 44 having the shape described above can press the bosses 22 and 32 toward the brush cutter head 68, that is, upward as the bolt 42 and the rotary output shaft 69 are screwed together. It is. Specifically, as shown in FIG. 2, a pressing member 44 is fitted inside the bosses 22 and 32 that are overlapped with each other, and on the lower surfaces of the head portion 42b of the bolt 42 and the first cylindrical portion 44a. With the plain washer 46 interposed, the screw shaft portion 42 a of the bolt 42 is screwed into the screw hole 69 a of the rotation output shaft 69, so that the space between the presser portion 44 c of the presser member 44 and the lower surface of the brush cutter head 68. It is possible to put both the boss portions 22 and 32 into the mounting state.

  If the diameters of the screw shaft portion 42a and the head portion 42b of the bolt 42 are sufficiently large, the pressing member 44 can be omitted and the bolt 42 can constitute a fastener alone. That is, the head portion 42b of the bolt 42 can function as a pressing member.

  The weeding cutter 10 shown in FIGS. 1 to 5 can be mounted on the main body 70 of the disc grinder shown in FIGS. 6 and 7 in the same manner as described above. Specifically, the main body 70 of the disc grinder has a motor (not shown) and a rotation output shaft 72 that is rotationally driven by the output of the motor, and the weeding cutter 70 is connected to the rotation output shaft 72. Is possible.

  Unlike the rotation output shaft 69, the rotation output shaft 72 constitutes a male screw portion. However, the rotation output shaft 72 is similar to the rotation output shaft 69 only by using a simple adapter 48 as shown in FIGS. Further, the cutter body 20 and the cover 30 can be fastened to the rotation output shaft 72. Specifically, the adapter 48 has a substantially cylindrical shape, an upper portion of the inner peripheral surface thereof forms a screw hole 48a that can be screwed with the rotary output shaft 72, and a lower portion of the inner peripheral surface is connected to the bolt 42. A screw hole 48b that can be screwed is formed. When the rotation speed of the rotation output shaft 72 is higher than that of the rotation output shaft 69, a spring washer 47 as shown in FIG. 6 and FIG. .

  As described above, the weeding cutter 10 can be connected to both the rotation output shaft 69 of the brush cutter main body 60 and the rotation output shaft 72 of the disc grinder main body 70 by common basic components. High versatility. Moreover, the weeding cutter 10 includes a cover 30 in addition to the cutter body 20, and these are fastened to the rotary output shafts 69 and 72 by a common fastener 40, so that while having high versatility, It is possible to prevent the cutter body 20 from coming into contact with non-objects that are not to be weeded.

  For example, as shown in FIG. 2, when the rotary output shaft 69 rotates in a state where the weeding cutter 10 is connected to the rotary output shaft 69, the boss portion 32 of the cutter body 20 and the cover 30 is integrally formed therewith. Rotate. At this time, since the cutter body 20 is positioned slightly below the cover 30, the cutting blade portion 26 of the blade 24 of the cutter body 20 can cut the root portion of the grass and mow the grass. When the outer peripheral surface of the peripheral wall 34c of the cover main body 34 of the cover 30 hits a non-target object such as a crop at a position outside the outer end of the cutter main body 20, the cutter main body 20 comes into contact with the non-target object. To prevent damage.

  Further, in the cover 30, since the bearing 36 is interposed between the boss portion 32 and the outer cover body 34, the cover body 34 is prevented from rotating at high speed integrally with the boss portion 32. Accordingly, damage to the non-object due to contact between the cover body 34 and the non-object is effectively suppressed. In particular, in this embodiment, the rotation preventing portion 38 included in the cover main body 34 corresponds to an appropriate portion of the brush cutter head 68 of the brush cutter main body 60 shown in FIG. 2 or the disc grinder main body 70 shown in FIG. In order to prevent relative rotation of the cover main body 34 with respect to the brush cutter head 68 and the disc grinder main body 70 by contact, when the rotational resistance of the bearing 36 is relatively large, that is, the bearing 36 is a cover main body with respect to the boss portion 32. Even when the capability of allowing the relative rotation of 34 is relatively low, it is possible to reliably prevent the cover main body 34 from being rotated around the boss portion 32 by using the brush cutter main body 60 or the disc grinder main body 70 itself. .

  Furthermore, the cutter body 20 according to this embodiment has a plurality of radially extending blades 24, and a sufficient space is secured between the blades 24, so that grass clogging is unlikely to occur. Moreover, since the cutting blade portions 26 are provided at both edges in the rotational direction of the blades 24, the weeding operation can be performed regardless of which direction the cutter body 20 is driven to rotate. In particular, when the brush cutter main body 60 and the disc grinder main body 70 shown in FIG. 2 are used as a rotation driving device, the former rotation output shaft 69 is often right-handed rotation, while the latter rotation output shaft 72 is left-handed. Since the rotation is often performed, the double-edged blade 24 as described above is effective.

  However, the specific shape of the cutter body according to the present invention is not particularly limited. For example, even if the cutter main body 20 has a plurality of blades 24A like the cutter main body 20A shown in FIG. 8, when the direction of rotation is determined at the time of use, only the front side of the rotation direction is used. The cutting blade part 26 should just be provided. Further, “radially extending outward in the rotational radius direction” is not necessarily limited to linearly extending. For example, like the cutter body 20B shown in FIG. 8, a blade having a shape that curves to the front in the rotational direction as it goes outward in the rotational radius direction can capture grass more reliably. Needless to say, the number of the blades is not limited. Or the cutter main body which concerns on this invention may have a disk-shaped rotary plate as described in patent document 1, and a some blade part with which the outer peripheral part is mounted | worn.

  10 and 11 show a weeding cutter 10C according to a second embodiment of the present invention. This weeding cutter 10C has the same basic configuration as the weeding cutter 10 shown in FIG. 2, but the lower surface of the pressing portion 44c of the pressing member 44 recognizes the degree of wear of the pressing portion 44c. A groove 44d is formed. The presser portion 44c of the presser member 44 protrudes below the lower surface of the blade 24 of the cutter body 20 and comes into sliding contact with the ground when in use. Therefore, the presser portion 44c is easily worn, and if the presser portion 44c breaks, the cutter body 20 and The cover 30 cannot be held. Therefore, if the groove 44d as described above is provided on the lower surface of the presser part 44c so that the degree of wear of the presser part 44c can be recognized from the depth of the groove 44d, the presser part 44c is not damaged before the presser part 44c is damaged. The member 44 can be exchanged.

  Alternatively, as in the weeding cutter 10D shown in FIG. 12 as the third embodiment, the lower surface 24d of the blade 24 is formed by interposing a step portion 28 between the boss portion 22 of the cutter body 20 and each blade 24. It is also effective to position it below the lower surface of the boss portion 22 and further below the lower surface of the pressing portion 44c. The step portion 28 allows the lower surface 24d of the blade 24 to come into contact with the ground to prevent contact between the presser portion 44c and the ground, thereby preventing wear of the presser portion 44c.

  The “fastener” referred to in the present invention is not limited to the one that directly connects the cutter body and the cover to the existing rotary output shaft provided in the rotary drive device. For example, the adapter 48 shown in FIGS. 6 and 7 is a relay member interposed between the boss portion 32 of the cutter body 20 and the cover 30 and the rotation output shaft 72 of the disc grinder body 70, and is shown in FIG. The fastener 40 is fastened to the adapter 48 serving as a relay member by fastening the cutter body 20 and the boss part 32, thereby connecting the cutter body 20 and the boss part 32 to the rotary output shaft 72 via the adapter 48. To be indirectly concluded. In the present invention, when such a relay member is provided, the specific shape and dimensions of the relay member are not limited.

  For example, when the weeding cutter 10 is connected to an electric power tool 80 as shown in FIG. 13 as a fourth embodiment and having a rotary output shaft 82 having a male screw portion, the adapter 48 is the same as described above. However, a further relay member may be interposed between the rotation output shaft 82 and the adapter 48.

  As a further relay member, in the fifth embodiment shown in FIG. 14, a plurality of long relay shafts 91 and 92 and a plurality of relay adapters 93 and 94 are connected to the rotation output shaft 82 and the adapter 48. It is interposed between. The relay shaft 91 includes a distal end portion 91a coupled to the adapter 48 and an end portion on the opposite side to the proximal end portion 91b coupled to the distal end portion 92a of the relay shaft 92 via the relay adapter 93. And having. The relay shaft 92 includes the distal end portion 92 a and a base end portion 92 b that is the opposite end portion and is connected to the rotation output shaft 82 of the electric power tool 80 via the relay adapter 94. Further, in order to make it possible to extend the rotation blocking portion in accordance with the introduction of the relay member including the relay shafts 91 and 92, the rotation blocking portion 38 'according to the fifth embodiment includes a plurality of splicable portions. It includes relay shafts 38c and 38d.

  According to the fourth and fifth embodiments shown in FIG. 13 and FIG. 14, by using a common power tool 80, the relay output member 82 and the cutter body 20 and the boss portion 32 intervene through a relay member. It becomes possible to perform weeding work in a plurality of postures. For example, the length of each relay member can be set so that the weeding operation can be performed in the middle waist posture in the form shown in FIG. 13 and in the standing posture in the form shown in FIG.

  Also in the fifth embodiment, the specific structure of the relay member is not limited. For example, the relay shafts 91 and 92 and the relay adapter 93 shown in FIG. 14 may be replaced with a single shaft or a hollow pipe that is lighter than that.

10, 10C, 10D Weeding cutter 20, 20A, 20B Cutter body 22 Boss portion 23 Insertion hole 24, 24A, 24B Blade 26 Cutting blade portion 30 Cover 32 Boss portion (fastened portion)
33 Insertion hole 34 Cover body 34c Peripheral wall 36 Bearing 38, 38 'Rotation prevention part 40 Fastener 42 Bolt 44 Holding member 46 Plain washer 48 Adapter (relay member)
60 Brush cutter body (rotary drive)
69 Rotation output shaft (Rotation output part)
70 Disc grinder body (rotary drive)
72 Rotation output shaft (Rotation output part)
80 Electric tools (rotary drive)
82 Rotation output shaft (Rotation output part)
91,92 Relay shaft (relay member)
93,94 Relay adapter (relay member)

The present invention provides a weeding cutter that performs a weeding operation for cutting grass by being connected to the rotation output unit of a rotary drive device having a rotation output unit. The herbicidal cutter includes a cutter body having a cutting edge portion which is capable of cutting the grass by contact with grass while rotating, and a cover covering the cutter body from the upper side of its said cutter body and And a fastener that detachably fastens the cutter body and the cover to the rotation output unit by being connected to the rotation output unit while penetrating through the cover in a state of overlapping each other. The cover has a shape surrounding an insertion hole through which the fastener can be inserted, and a fastening portion fastened to the rotation output portion together with the cutter body by the fastener, and an outer side in a rotational radius direction of the fastening portion And the cutter body cuts the grass by being located further outside than the end of the cutter body in the rotational radius direction and located above the end over the entire circumference. the allowable said cutter body while to allow the cover body having an outer circumferential surface for preventing the contact with the object other than herbicide target, the intervention to relative rotation therebetween between said cover body and the coupling part And a bearing that prevents the outer peripheral surface of the cover body from rotating together with the cutter body .

According to this weeding cutter, the outer peripheral surface of the cover body of the cover that covers the cutter body from the upper side is located further outside and above the outer end of the cutter body, and the cutter body and an object that is not to be weeded. (For example, crops; hereinafter referred to as “non-object”) is prevented, so that weeding can be easily performed without damaging the non-object. In addition, since the cutter body and the cover are fastened to the rotation output portion of the rotary drive device by a common fastener that passes through them, the cutter body and the cover can be easily mounted on various rotary drive devices. Is expensive.

Further, the cover includes a fastened part, a cover main body, and a bearing, and the bearing is a cover main body with respect to the fastened part in a state where the fastened part is fastened together with the cutter main body to the rotation output part of the rotary drive device. since allowing the relative rotation, said cutter body and said it is possible the outer peripheral surface of the cover body together with the fastening portion is suppressed to rotate, thereby, the outer peripheral surface of the cover body the non-target object It is possible to effectively prevent the non-object from being damaged when touched.

Claims (5)

A weeding cutter that performs a weeding operation to cut grass by being connected to the rotation output unit of a rotation drive unit having a rotation output unit,
A cutter body having a cutting blade portion capable of cutting the grass by contacting with the grass while rotating;
A cover covering the cutter body from the upper side in the rotational radius direction;
A fastener for detachably fastening the cutter body and the cover to the rotation output unit by being connected to the rotation output unit while passing through the cutter body and the cover in a state of overlapping each other. ,
The cover has a shape surrounding an insertion hole through which the fastener can be inserted, and a fastening portion fastened to the rotation output portion together with the cutter body by the fastener, and an outer side in a rotational radius direction of the fastening portion And a cover body having an outer peripheral surface that prevents the cutter body from coming into contact with an object other than the weeding target by being located further outside than the end of the cutter body in the rotational radius direction, A weeding cutter comprising: a bearing that is interposed between the fastened portion and the cover main body and allows relative rotation of both.   2. The weeding cutter according to claim 1, wherein the cutter body has a plurality of blades extending radially from the center of rotation toward the outside in the rotational radial direction, and each blade is provided at a front edge in the rotational direction. A weeding cutter having a cutting blade located.   3. The weeding cutter according to claim 2, wherein each blade of the cutter body has the cutting blade portions at both side edges in the rotation direction. 4.   The weeding cutter according to any one of claims 1 to 3, wherein the cover body is in contact with the rotary drive device in a state where the fastened portion is fastened to a rotation output portion of the rotary drive device. A weeding cutter having a rotation blocking portion for blocking relative rotation of the cover main body with respect to the rotation driving device.   The weeding cutter according to any one of claims 1 to 4, further comprising a relay member connected to a rotation output portion of the rotary drive device, wherein the fastener is a fastening portion of the cutter body and the cover. A weeding cutter that fastens the fastened portion of the cutter main body and the cover main body to the rotation output portion via the relay member by fastening the screw to the relay member.

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