JP4457092B2 - Attachment for brush cutter and brush cutter - Google Patents

Description

  The present invention is used in a brush cutter that cuts off an object such as grass or a small tree with a rotating disk-shaped cutting blade, defines the cutting depth in the radial direction of the cutting blade, and the operator of the brush cutter and The present invention relates to an attachment for a brush cutter that minimizes biting of the cutting blade when the cutting blade hits the surrounding person by mistake, and a brush cutter using the attachment for the brush cutter.

Conventionally, as a brush cutter that defines the cutting depth in the radial direction of a cutting blade, for example, the one described in Patent Document 1 (Japanese Utility Model Laid-Open No. 6-19419) is known.
As shown in FIGS. 12 and 13, the brush cutter Sa includes an operating rod 101 and a cutting blade 102 fixed to a rotary shaft provided at the tip of the operating rod 101. On the lower surface of the cutting blade 102, a donut-shaped ridge 104 having a diameter smaller than that of the cutting blade 102 is provided integrally with the cutting blade 102. Then, the cutting blade 102 is rotated to cut off the target object 100 such as weed on the outer periphery of the cutting blade 102. In this case, the cutting depth in the radial direction of the cutting blade 102 is defined at the outer peripheral edge of the ridge 104, and when the cutting blade 102 accidentally hits the operator of the brush cutter Sa and the surrounding people. In addition, since the outer periphery of the ridge 104 is in contact with the vicinity of the cut end, the cutting blade 102 can be held in a minimum.

Conventionally, as a brush cutter that defines a cutting depth in the radial direction of a cutting blade, for example, a type using an attachment described in Patent Document 2 (Japanese Utility Model Publication No. 2-28668) is also known. .
As shown in FIG. 14, the brush cutter Sb includes an operating rod 101 and a cutting blade 102 fixed to a rotary shaft 105 provided at the tip of the operating rod 101. The rotating shaft 105 is provided with a seat 106 that moves together with the rotating shaft 105 on the base end side. The cutting blade 102 includes a disc 102a having a through hole in the center and a plurality of blades 102b fixed to the disc 102a. The rotating shaft 105 is inserted through the through hole of the disc 102a. The cutting blade 102 is fixed to the rotating shaft 105 by a presser member 107 that presses and holds the cutting blade 102 against the seat 106. The presser member 107 has an insertion hole that is inserted through the rotary shaft 105 at the center of the presser member 107, and presses and holds the cutting blade 102 by screwing a nut 107 a into a male screw 105 a formed on the rotary shaft 105. ing. In the figure, reference numeral 108 denotes a cover that moves together with the rotary shaft 105 and covers the upper surface of the cutting blade 102.

The attachment Ma is detachably attached to the lower surface side of the cutting blade 102 and is fixed to the disc body 109 having a smaller diameter than the cutting blade 102 and defining the cutting depth in the radial direction of the cutting blade 102 by the outer peripheral end, and the rotary shaft 105. An attachment member 110 for attaching the disk body 109 is provided.
The disk body 109 is formed in a shallow bowl shape, and is fixed so that the inner side faces the lower surface side of the cutting blade 102. The attachment member 110 is rotatably provided on the outer side of the pressing member 107 via a bearing 111. The mounting member 110 is formed with a female screw 112. The disk body 109 is attached to the mounting member 110 by inserting a bolt 113 into a hole 109 a provided in the disk body 109 and fastening the bolt 113 to the female screw 112 of the mounting member 110.
In this state, the brush cutter Sb cuts off an object that can be cut by the cutting blade 102 even if the cutting depth is relatively small, such as weeds, by the rotation of the rotary shaft 105.
In this case, the cutting depth in the radial direction of the cutting blade 102 is defined at the outer peripheral edge of the disk body 109, and the cutting blade 2 is accidentally hit by the operator of the brush cutter Sb and the surrounding people. Furthermore, since the outer periphery of the disk body 109 abuts near the cut end, the cutting blade 102 can be minimized.

Japanese Utility Model Publication No. 6-19419 No. 2-28668

By the way, in the brush cutter Sa described in Patent Document 1, it is preferable to cut grass. For example, when a relatively thick object such as a tree branch is to be cut, the ridge 104 is formed on the cutting blade 102. Since it is fixed, the ridges 104 get in the way and cannot be cut. That is, there is a problem that the object cannot be cut beyond the cutting depth defined by the disc body 109.
In the brush cutter Sb using the brush cutter attachment Ma described in Patent Document 2, when it is desired to cut a relatively thick object such as a tree branch, the disc body 109 of the brush cutter attachment Ma is used. Since the bolt 113 is attached to the attachment member 110 via the bolt 113, the disc body 109 can be removed by removing the bolt 113. However, if the bolt 113 is not loosened using a tool such as a spanner. Therefore, there is a problem that the work of attaching and detaching the disc body 109 becomes complicated. Especially in places where grass and tree branches are mixed and grass cutting and branch cutting are repeated alternately, the disk body 109 is frequently attached and removed, and every time it is attached and removed, Since the bolts 113 must be tightened and loosened with a tool one by one, it becomes increasingly complicated.

  The present invention has been made in view of the above-described problems. The disk body can be attached to and detached from the attachment member without using a tool, and the attachment / detachment work is facilitated to improve versatility. An object of the present invention is to provide a brush cutter attachment and a brush cutter using the brush cutter attachment.

  An attachment for a brush cutter according to the present invention for achieving such an object includes a disk-shaped cutting blade that is fixed by inserting a central through-hole into a rotation shaft at a tip end portion of an operating rod. An attachment for a brush cutter used in a brush cutter for cutting off an object with the cutting blade by rotation, wherein the attachment is detachably attached to the lower surface side of the cutting blade, and the cutting depth in the radial direction of the cutting blade is set by the outer peripheral end. An attachment for a brush cutter comprising: a disc body having a diameter smaller than that of the cutting blade to be defined; and an attachment member fixed to the rotating shaft and attached to the disc body, wherein the tightening direction is in the center of the disc body. A female screw having a direction opposite to the rotation direction of the blade is formed, the mounting member is formed in a cylindrical shape having a male screw that is screwed to the female screw, and the disk body is attached to the mounting member. The female screw and male screw It has a configuration in which a handle for performing tightening or the loosening of.

  When cutting an object that can be cut even if the cutting depth is relatively small, such as weeds, etc., grip the handle, rotate the disc body, and tighten the disc body's female screw to the mounting member's male screw. Attach the disk to the member. Thus, the disk body can be attached to the mounting member without using a tool, simply by gripping the handle by hand and rotating the disk body. In this state, the rotating shaft is rotated, the cutting blade is applied to the object, and this is cut off.

At this time, since the tightening direction of the female screw of the disk body is the reverse rotation direction to the rotation direction of the cutting blade, the female screw of the disk body is the male screw of the mounting member even if the disk body is rubbed against the ground by rotating the cutting blade. Therefore, it is possible to prevent the disk body from being detached from the mounting member during the brushing operation.
In addition, the cutting edge in the radial direction of the cutting blade is defined by the outer peripheral edge of the disk body, and even if the cutting blade hits the operator of the brush cutter and the surrounding person by mistake, the outer peripheral edge of the disk body Since it comes into contact with the vicinity of the cut edge, the cutting blade can be minimized.

After that, for example, when cutting a large object such as a relatively thick branch, especially when it is desired to cut beyond the cutting depth specified by the disc body, the rotation of the rotary shaft of the brush cutter is stopped. Then, grip the handle, rotate the disk body, loosen it with respect to the mounting member, and remove the disk body from the mounting member. Thus, the disk body can be detached from the mounting member without using a tool, simply by gripping the handle by hand and rotating the disk body.
And in this state, a rotating shaft is rotated and an object is cut | disconnected. At this time, since the disc body is removed, the cutting depth can be increased, and even a relatively thick branch can be easily cut.

  Further, when cutting out weeds and the like again, the disc body is attached to the attachment member in the same manner as described above. That is, since the disc body can be rotated by gripping the handle, the disc body can be attached to and detached from the attachment member one by one without using a tool. Therefore, attachment / detachment work can be easily performed, and versatility can be improved.

Further, if necessary, a male screw is formed on the rotating shaft, an insertion hole is formed through the rotating shaft at the center of the mounting member, and the cutting blade is attached to the rotating shaft by screwing a nut onto the rotating shaft. The mounting member is pressed and held.
As a result, the attachment blade can press and hold the cutting blade against the rotation shaft, and the attachment member can be fixed to the rotation shaft, thereby simplifying the structure of the entire brush cutter attachment. Therefore, it can be manufactured easily and a reduction in manufacturing cost can be expected.

Further, if necessary, the handle is formed in a block shape in the center of the lower surface of the disc body, and a recess is formed on the outer periphery of the handle so that a finger can be hooked.
Thereby, when rotating a disk body with respect to an attachment member, a finger | toe is latched and held in a recess and a disk body is rotated with respect to an attachment member.
Moreover, since the handle is bulged and formed in a block shape, the handle becomes relatively strong. For example, even if the handle comes into contact with the ground during rotation of the cutting blade, the handle situation is hardly damaged. Furthermore, the appearance quality is relatively good.

Furthermore, at least the disk body of the disk body and the mounting member is formed of resin as necessary.
Since the resin is relatively easy to process, the disk body can be easily manufactured.

Next, if necessary, protrusions are provided on the outer periphery of the lower surface of the disk body.
As a result, protrusions are provided on the outer periphery of the lower surface of the disk body, and the outer end edge of the disk body that is raised by the protrusions contacts the object, so that the cutting depth of the cutting blade is reliably defined. be able to.

Further, as necessary, at least the disk body of the disk body and the mounting member is formed of resin, and metal is embedded in the ridges of the disk body along the outer circumferential direction of the disk body.
Thereby, the ridges of the disk body are reinforced, and damage such as the ridges being shaved can be reduced even when the top of the ridges of the disk body and the ground rub against each other.

In addition, when the disk body is removed, a protective member that is attached to the mounting member instead of the disk body and covers the mounting member to protect the mounting member is provided as necessary.
In this case, after removing the disk body, the protection member is attached to the attachment member, and the rotating shaft is rotated in this state to cut the object with the cutting blade. Therefore, the mounting member is covered with the protective member and protected and is not exposed to the outside, so that it is possible to prevent a situation where the male screw is damaged.

And the brush cutter of this invention for solving the said subject uses said attachment for brush cutters.
In the attachment for a brush cutter, the attachment and detachment of the disk body does not have to be performed using a tool one by one, so that the disk body can be easily attached and detached.

According to the brush cutter attachment and the brush cutter of the present invention, the handle is gripped to rotate the disc body, and the disc body is attached to the mounting member by fastening the female screw of the disc body to the male screw of the mounting member. The disc body is rotated by rotating the disc body and loosening the disc body screw with respect to the male screw of the mounting member to remove the disc body from the mounting member, so by simply holding the handle and rotating the disc body one by one The disc body can be attached to and detached from the attachment member without using a tool, and the attaching / detaching operation of the disc body to the attachment member can be easily performed, thereby improving versatility.
In addition, since the tightening direction of the female screw of the disk body is the direction opposite to the rotation direction of the cutting blade, when the object is scraped off by rotating the cutting blade, the female body of the disk body will be rubbed against the ground. Since the screw does not loosen with respect to the male screw of the mounting member, it is possible to prevent the disc body from being detached from the mounting member during the brushing operation.

  Hereinafter, the attachment for a brush cutter and the brush cutter according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 to 4, the brush cutter S using the brush cutter attachment M includes an operating rod 1 and a cutting blade 2 fixed to a rotary shaft 3 provided at a distal end portion 1 a of the operating rod 1. ing. The rotating shaft 3 is provided with a seat 5 that moves together with the rotating shaft 3 on the proximal end side, and a male screw 3a is formed on the distal end side thereof. At the center of the seat 5, a circular convex portion 5 a provided coaxially with the rotary shaft 3 is formed to project. The cutting blade 2 is formed with a saw blade 2a on the outer periphery. A through hole 6 is provided at the center of the cutting blade 2. In addition, the rotary shaft 3 is inserted into the through hole 6 of the disk, and the convex portion 5a is inserted. Then, the cutting blade 2 is fixed to the rotary shaft 3 via an attachment member 30 described later. Although not shown, the rotary shaft 3 is rotated in the rotation direction R1 by receiving power from the engine or the like via a transmission shaft inserted into the operation rod 1.

  In the embodiment, an existing brush cutter is used as the brush cutter S. As shown in FIG. 9, in the brush cutter S, the cutting blade 2 is fixed to the rotating shaft 3 by a presser member 10 that holds the cutting blade 2 on a seat 5. The presser member 10 is formed with an insertion hole 11 inserted into the rotary shaft 3 at the center of the presser member 10, and presses the cutting blade 2 by screwing a nut 12 into a male screw 3 a formed on the rotary shaft 3. Hold. When attaching the brush cutter attachment M of the present invention to the brush cutter S, the nut 12 is previously loosened and the presser member 10 is removed from the rotary shaft 3 in advance.

  As shown in FIGS. 1 to 8, the attachment M used in the brush cutter S is detachably attached to the lower surface 7 side of the cutting blade 2 and defines the cutting depth h in the radial direction of the cutting blade 2 by the outer peripheral end. A disc body 20 having a diameter smaller than that of the cutting blade 2 and an attachment member 30 fixed to the rotary shaft 3 for attaching the disc body 20 are provided.

The disk body 20 is formed of resin, and a protruding line 21 is provided on the outer periphery of the lower surface 25 of the disk body 20. A metal 22 is embedded in the ridges 21 of the disk body 20 along the outer circumferential direction of the disk body 20. Since the resin is relatively easy to process, the disk body 20 can be easily manufactured. The metal 22 is formed in a ring shape, and forms a concave groove 23 at the top of the ridge 21 and is embedded in the concave groove 23. Furthermore, a plurality of holes 28 for reducing the weight of the disk body 20 are formed in the general part of the disk body 20.
Further, in the center of the disk body 20, a female screw 24 whose tightening direction is a rotation direction R2 opposite to the rotation direction R1 of the cutting blade 2 is formed.

The attachment member 30 is made of resin, and is formed in a columnar shape in which a male screw 31 that engages with the female screw 24 is formed. An insertion hole 32 that is inserted through the rotary shaft 3 is formed at the center of the attachment member 30. Further, a concave portion 33 into which the convex portion 5 a enters is formed on one end surface of the mounting member 30. Then, the cutting blade 2 is pressed and held by the mounting member 30 by screwing the nut 35 onto the rotating shaft 3. The nut 35 has a screw groove formed in a tightening direction in a rotation direction R2 opposite to the rotation direction R1 of the cutting blade 2. Furthermore, when the attachment member 30 is not fixed to the rotary shaft 3 and is accidentally screwed into the female screw 24 of the disk body 20 and difficult to remove, for example, a wrench or the like is inserted into the attachment member 30. Is rotated with respect to the disk body 20, and a hole 38 for taking out the attachment member 30 from the female screw 24 of the disk body 20 is provided. The hole 38 is formed in a hexagonal shape so that a hexagon wrench can be inserted.
In the figure, reference numeral 36 is a washer provided integrally with the nut, and reference numeral 34 is a hole recessed in a circular cross section to hold the nut.

Further, the disc body 20 is integrally provided with a handle 40 for rotating the disc body 20 with respect to the mounting member 30 to tighten or loosen the female screw 24 and the male screw 31. The handle 40 is bulged and formed in a block shape at the center of the lower surface 25 of the disk body 20. On the outer periphery of the handle 40, a recess 41 capable of hooking a finger is formed. In the embodiment, the handle 40 is formed in a hemispherical shape on the lower surface 25 of the disk body 20. Four recesses 41 are provided in an equiangular relationship. Further, the handle 40 is provided with a concave portion 42 with a predetermined depth from the side of the disc body 20 facing the cutting blade 2, and a female screw 24 is formed on the inner periphery of the concave portion 42.
Furthermore, if the female screw 34 of the disc body 20 is too tightly tightened with respect to the male screw 31 of the mounting member 30, the handle 40 is provided with the female screw 34 with respect to the male screw 31 using a wrench or the like. A hole 45 is formed so that it can be loosened. The hole 45 is formed in a hexagonal shape so that a hexagon wrench can be inserted.

  As shown in FIGS. 6 to 8, when removing the disk body 20, a protective member 50 is attached to the mounting member 30 instead of the disk body 20 and covers the mounting member 30 to protect the mounting member 30. Is provided. The protection member 50 is formed in a cup shape with resin, and a female screw 52 that can be screwed to the male screw 31 of the mounting member 30 is formed on the inner periphery 51 thereof. The female screw 52 is formed so that the tightening direction is the rotation direction R2 opposite to the rotation direction R1 of the cutting blade 2. In addition, a plurality of recesses 53 capable of hooking fingers are formed on the outer periphery of the protection member 50. Four recesses 53 are provided in an equiangular relationship. Further, a hole 55 similar to the hole 45 is formed in the protective member so that the female screw 52 can be loosened with respect to the male screw 31 using a wrench or the like.

Therefore, when the brush cutter S is used, the following is performed.
When cutting an object that can be cut even if the cutting depth is relatively small, such as weeds, as shown in FIGS. At the same time, the attachment member 30 is prevented from rotating, and the handle 40 is held by holding the finger in the recess 41 to rotate the disc body 20 in the rotation direction R2 opposite to the rotation direction R1. The disk body 20 is attached to the mounting member 30 by tightening the female screw 24 of the disk body 20 to 31. Accordingly, the disk body 20 can be attached to the attachment member 30 without using a tool by simply holding the handle 40 and rotating the disk body 20, so that the attachment work of the disk body 20 to the attachment member 30 is possible. Can be easily performed.

Then, the rotary shaft 3 is rotated, the saw blade 2a of the cutting blade 2 is applied to the object, and the object is cut off.
At this time, the tightening direction of the female screw 24 of the disk body 20 is the rotation direction R2 opposite to the rotation direction R1 of the cutting blade 2. Therefore, even when the cutting blade 2 is rotated and the disk body 20 is rubbed against the ground, The female screw 24 does not loosen with respect to the male screw 31 of the mounting member 30, and the situation where the disk body 20 is detached from the mounting member 30 during the brushing operation is prevented.

Further, even if the cutting edge h in the radial direction of the cutting blade 2 is defined at the outer peripheral edge of the disk body 20 and the operator of the brush cutter S and the surrounding person accidentally hit the cutting blade 2, Since the outer peripheral edge of the body 20 abuts, the biting of the cutting blade 2 can be minimized.
Further, the protrusion 21 protrudes from the outer periphery of the lower surface 25 of the disk body 20, and the outer peripheral edge of the disk body 20 raised by the protrusion 21 abuts on the side surface of the object to be cut. The definition of the depth h can be ensured. In addition, since the metal is embedded in the ridges 21 of the disk body 20, the ridges 21 of the disk body 20 are reinforced, for example, even if the top of the ridges 21 of the disk body 20 is rubbed against the ground. Damage such as the strip 21 being cut can be reduced.
Furthermore, since the handle 40 is formed in a block-like shape at the center of the lower surface 25 of the disc body 20, the handle 40 becomes relatively strong, and the handle 40 is not affected even if the handle 40 contacts the ground when the cutting blade 2 rotates. It becomes difficult to damage itself.

  Further, for example, when cutting a large object such as a relatively thick branch that cuts beyond the cutting depth h defined by the disk body 20, as shown in FIGS. While the rotation of the rotary shaft 3 of the blower S is stopped, the cutting blade 2 is pressed by hand, and the disc body 20 is rotated in the rotation direction R1 by hooking a finger on the recess 41 of the handle 40 and holding it with the hand. Then, loosen the mounting member 30 and remove the disc body 20 from the mounting member 30. As a result, the disc body 20 can be removed from the mounting member 30 without using a tool by simply holding the handle 40 and rotating the disc body 20 one by one. Removal work can be performed easily.

Then, the finger of the hand is hooked on the recess 53 to grip the protection member 50, the cutting blade 2 is pressed by hand, the protection member 50 is rotated in the rotation direction R2 opposite to the rotation direction R1, and the female of the protection member 50 The protective member 50 is attached to the mounting member 30 by tightening the male screw 31 of the mounting member 30 to the screw 52.
In this state, the rotating shaft 3 is rotated to cut the object. At this time, since the disc body 20 is removed, the cutting depth can be increased, and even a relatively thick branch can be easily cut. Moreover, since the attachment member 30 is covered and protected by the protection member 50 and is not exposed to the outside, it is possible to prevent the male screw 31 from being damaged.

Thereafter, when weeds and the like are to be removed again, the finger of the hand is hooked in the recess 53 to grip the protective member 50, the cutting blade 2 is pressed by hand, and the protective member 50 is rotated in the rotation direction R1. Then, the female screw 52 of the protective member 50 is loosened with respect to the male screw 31 of the mounting member 30, and the protective member 50 is removed from the mounting member 30. Next, the disk body 20 is attached to the attachment member 30 in the same manner as described above. Thereby, the disk body 20 can be attached to and detached from the attachment member 30 without using a tool one by one, the attachment / detachment work can be easily performed, and versatility can be improved.
Further, instead of the pressing member 10, the cutting blade 2 can be pressed and held on the rotating shaft 3 by the mounting member 30, and the structure of the mounting member 30 becomes simple and can be manufactured at low cost. Furthermore, since the attachment member 30 can be fixed to the rotary shaft 3 of the existing brush cutter S, the versatility can be improved.

Note that the attachment member 30 of the brush cutter attachment M of the present invention has the insertion hole 32 formed in a circular cross section, but is not limited to this, and as shown in FIG. According to the shape of the rotating shaft 3, for example, it may be formed in a spline shape, and the design may be changed as appropriate. In this case, it is difficult for the attachment member 30 to rotate freely with respect to the rotating shaft 3, and the disk body 20 can be easily attached.
The disc body 20 of the present invention has a plate-like general portion, but is not limited to this. For example, as shown in FIG. 11, a handle 40 at the center of the disc body 20 is used. It is good also as a structure provided with the some flame | frame 29 extended toward the protruding item | line 21 of an outer periphery.
Moreover, although the metal 22 was embed | buried under the protruding item | line 21 provided in the disc body 20 of this invention, it is not necessary to provide the metal 22, and it does not interfere with a design change suitably.

It is a perspective view which shows the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention. It is a disassembled perspective view which shows the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention. It is sectional drawing which shows the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing at the time of attaching the disc body to an attachment member, showing the brush cutter using the brush cutter attachment and the brush cutter attachment according to the embodiment of the present invention. It is a perspective view which shows the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention from the back surface. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention, and having attached the protection member to the attachment member. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing at the time of attaching the protection member to the attachment member, showing the brush cutter using the brush cutter attachment and the brush cutter attachment according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view from the back side which shows the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention, and shows the state which attached the protection member to the attachment member. It is sectional drawing of a common brush cutter. It is a figure which shows the modification of the attachment member of the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention. It is a figure which shows the modification of the disc body of the brush cutter using the attachment for brush cutters and the attachment for brush cutters concerning embodiment of this invention. It is a figure which shows an example of the conventional brush cutter. It is a figure which shows an example of the cutting blade of the conventional brush cutter. It is a figure which shows another example of the attachment for a conventional brush cutter, and a brush cutter.

Explanation of symbols

M attachment for brush cutter S brush cutter 1 operation rod 1a tip 2 cutting blade 3 rotating shaft 3a male screw 5 seat 5a convex portion 6 through-hole 7 lower surface 20 of cutting blade disc 21 ridge 22 metal 23 concave groove 24 female screw 25 Lower surface 28 of disc body Hole R1 Direction of rotation of cutting blade R2 Direction of reverse rotation of cutting blade rotation direction 30 Mounting member 31 Male screw 32 Insertion hole 33 Recessed portion 34 Hole 35 Nut 36 Washer 38 Hole 40 Handle 41 Recess 42 Recess 45 Hole 50 Protection member 51 Inner circumference 52 of protection member Internal thread 53 Recess 55 Hole

Claims (8)

A brush cutter for use in a brush cutter that has a disc-shaped cutting blade that is fixed by inserting a through hole at the center of the rotary shaft at the tip of the operation rod, and that cuts off an object by the rotation of the rotary shaft. Attachment for removably attaching to the lower surface side of the cutting blade and defining a cutting depth in the radial direction of the cutting blade by an outer peripheral end and fixed to the rotating shaft and the rotating shaft And an attachment for a brush cutter provided with an attachment member for attaching the disk body,
Forming in the center of the disc body a female screw whose tightening direction is the reverse of the direction of rotation of the cutting blade, and forming the mounting member in a cylindrical shape with a male screw threadingly engaged with the female screw, An attachment for a brush cutter, wherein the disc body is provided with a handle for rotating the disc body with respect to the mounting member to tighten or loosen the female screw and the male screw.   A male screw is formed on the rotating shaft, an insertion hole is formed through the rotating shaft at the center of the mounting member, and the cutting blade is pressed and held by the mounting member by screwing a nut onto the rotating shaft. The brush cutter attachment according to claim 1, wherein the attachment is provided.   3. The brush cutter according to claim 1, wherein the handle is formed in a block shape so as to bulge out at the center of the lower surface of the disc body, and a recess is formed on the outer periphery of the handle so that a finger can be hooked. attachment.   4. The brush cutter attachment according to claim 1, wherein at least the disk body of the disk body and the mounting member is made of resin.   5. A brush cutter attachment according to claim 1, wherein a protrusion is provided on the outer periphery of the lower surface of the disc body. Of the disk body and the mounting member, at least the disk body is formed of resin,
The attachment for a brush cutter according to claim 5, wherein a metal is embedded in the ridges of the disc body along the outer circumferential direction of the disc body.   A protective member that is attached to the mounting member instead of the disk body and covers the mounting member to protect the mounting member when the disk body is removed is provided. , 4, 5 or 6. A brush cutter using the brush cutter attachment according to any one of claims 1 to 7.

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