JP2007020588A5 - - Google Patents

Description

Brush cutter guide device

  A brush cutter with a head that attaches a rotary blade to the tip of a support rod and cuts grass and shrubs with a rotary blade attached to the head using an engine or motor as a power source. It is invention which concerns on the guide apparatus for cut | disconnecting a thing.

2. Description of the Related Art A brush cutter for cutting a weed or a forest by attaching a rotary blade such as a tip saw to a head portion provided at the tip of a support rod is widely spread and widely used. Such a brush cutter is suitable for cutting weeds, etc., but when trying to cut a relatively thick thing such as a thick shrub or bamboo, it is rebounded vigorously by the reaction of the rotating blade rotating at high speed. And dangerous. For this reason, thin shrubs and the like are cut by a brush cutter, but when cutting thick shrubs and bamboo to some extent, the actual situation is that they are cut manually by using a hand saw.
In the brush cutter, in order to prevent the cut object such as grass cut by the rotary blade from scattering to the periphery, a guide for guiding the cut object to one side of the rotary blade and discharging it is provided above the rotary blade. The idea of arrangement is disclosed in Patent Document 1. However, there was no means for safely cutting bamboo and some thick shrubs using a brush cutter.
Japanese Patent No. 2931284

Cutting bamboo and shrubs by hand has the disadvantage of requiring a lot of labor and time. In addition to manual work, cutting with a chainsaw is also being carried out. In this case, however, the cutter part is dangerous because it is close to the hand and body, and it is a work that bends down.
In view of the above disadvantages of the prior art, the present invention provides a guide device that can cut bamboo and shrubs safely and efficiently using a brush cutter mainly used for cutting grass such as weeds. It is the purpose. It is another object of the present invention to provide a guide device for a brush cutter that has good workability and can safely proceed even when used for a normal mowing operation.

The invention according to claim 1, which achieves the above object, comprises a head portion to which a rotary blade is attached at the tip of a support rod, and cuts an object to be cut such as grass, shrub or bamboo by the rotary blade attached to the head portion. A brush cutter guide device to be mounted on a brush cutter, having protrusions on the upstream side and the downstream side of the rotary blade, wherein the upstream protrusion portion protrudes larger than the outer peripheral edge of the rotary blade, The downstream protrusion also protrudes larger than the outer peripheral edge of the rotary blade, and an introduction part for the object to be cut is formed between the upstream protrusion and the downstream protrusion, and the upstream protrusion and the downstream protrusion It is a guide device for brush cutters characterized by being able to introduce an object to be cut between parts.

The invention according to claim 2 is the brush cutter guide device according to claim 1, wherein the protrusion is formed sideways with respect to the supporting rod direction.

The invention according to claim 3 is equipped with a head part for attaching a rotary blade to the tip of the support rod, and attached to a brush cutter for cutting an object to be cut such as grass, shrub or bamboo by the rotary blade attached to the head part. The brush cutter guide device has protrusions protruding from the outer peripheral edge of the rotary blade on the upstream side and the downstream side of the rotary blade, and the downstream protrusion rotates with respect to the support rod direction. The brush cutter guide device is characterized in that it projects toward the side of the blade, and the downstream projecting portion is pressed against the portion to be cut and the reaction force is supported at the time of cutting.

The invention according to claim 4 has a pair of guide rods, and the pair of guide rods has a base end portion fixed to a fixing member such as a support rod, and the protruding portions are formed by the pair of guide rods. The brush cutter guide device according to any one of claims 1 to 3, wherein the brush cutter guide device is provided.

The invention according to claim 5 is the brush cutter according to claim 4, wherein a folded portion that is folded back to the base at a position below the rotary blade is formed on both or one of the projecting portions. It is a guide device.

The invention according to claim 6 is the guide in which the protruding dimension of the protruding portion of the guide rod located on the downstream side in the rotation direction of the rotary blade among the pair of left and right guide rods is located on the upstream side in the rotation direction of the rotary blade. The guide device for a brush cutter according to claim 4 or 5, wherein the guide device is larger than a protruding dimension of the protruding portion of the ridge.

The invention according to claim 7 is characterized in that the folded portion formed on the protruding portions of the pair of left and right guide rods has a warped shape in which the folded portion has an inclined portion. A brush cutter guide device.

The invention according to claim 8 is characterized in that the pair of left and right guide rods are integrally formed and detachable from a fixing member such as a support rod. This is a guide device for a dispenser.

In order to achieve the above object, the invention related to the invention described in claim 1 is provided with a head portion 3 for attaching the rotary blade 2 to the tip of the support rod 1, and the grass is formed by the rotary blade 2 attached to the head portion 3. In a brush cutter that cuts a shrub or shrub, an upper guide 4 is disposed above the rotary blade 2, and a lower guide 5 is disposed below the rotary blade 2. The upper guide 4 disposed above the rotary blade 2 is provided with a protruding portion 6 that projects forward on the upstream side of the rotation of the rotary blade 2, and the lower guide 5 disposed below the rotary blade 2 includes A protruding portion 7 protruding forward is formed on the downstream side of the rotation of the rotary blade 2. The protruding portion 6 of the upper guide 4 and the protruding portion 7 of the lower guide 5 are arranged at an interval at which an object to be cut such as bamboo or shrub can be introduced.

  With the above-described configuration, the tip of the support rod 1 is pushed forward in a state where an object to be cut such as bamboo or shrub is positioned between the protrusion 6 of the upper guide 4 and the protrusion 7 of the lower guide 5. Then, the rotary blade 2 comes into contact with the workpiece and cutting is performed. At this time, the reaction force acting on the brush cutter when the rotary blade 2 abuts on the workpiece acts so as to press the workpiece against the protruding portion 7 of the lower guide 5, and the brush cutter is stable without being rebounded. To do. In this state, when the rotary blade 2 is pushed forward, an object to be cut such as bamboo or shrub is cut, and the cut bamboo or shrub slides on the upper surface of the rotary blade 2 to the downstream side of the rotation of the rotary blade 2. To be discharged.

According to the brush cutter guide device of the present invention, even if it is relatively thick, such as bamboo or shrub, and is rebounded by the reaction force of the rotational force of the rotary blade 2, the reaction force caused by the rotation of the rotary blade 2 is not affected. It acts so as to press the cut object against the protrusion 7 of the lower guide 5 and stabilizes. Therefore, it is possible to cut a relatively thick bamboo or shrub safely and easily by pushing the entire brush cutter, in other words, the rotary blade 2 forward. At this time, the cut object is smoothly discharged by sliding on the upper surface of the rotary blade 2, and does not bite between the protruding portion of the lower guide 5 and the rotary blade 2, so that the work can be efficiently performed. Can proceed.

In order to achieve the above-mentioned object, another invention related to the invention described in claim 1 fixes the upper guide 4 to the support rod 1 or the head portion 3 of the brush cutter as a specific configuration. On the other hand, the lower guide 5 is detachable from the upper guide 4. As a result, when the lower guide 5 is removed, only the upper guide 4 is attached, which is used for normal undergrowth cutting and the like. At this time, the lower guide 5 does not interfere with the mowing, and the upper guide 4 can prevent the cut grass from scattering and function as a guide means for accumulating the objects to be cut.

According to the present invention, the lower guide 5 can be removed and used as a brush cutter for cutting ordinary weeds and the like. At this time, the upper guide 4 prevents the cut object from scattering and functions as a guide for bringing the weeds that have been cut to the one side as much as possible, so that it can be used as a convenient tool for cleaning after mowing. Can do.
If the upper guide 4 is detachably attached to the support rod 1 and the head portion 3 of the brush cutter and the lower guide 5 is detachably attached to the upper guide 4, a general-purpose brush cutter currently in use can be used. Bamboo and shrubs can be cut safely and efficiently.

The upper guide 4 and the lower guide 5 can be formed not by being arranged at the upper position and the lower position of the rotary blade 2 but by being arranged at the upper position of the rotary blade 2 and folding back the tip portion thereof.
In another related invention, a pair of guide rods 27 and 28 are arranged at an upper position of the rotary blade 2 at an interval at which an object to be cut such as bamboo or shrub can be introduced. The pair of guide rods 27 and 28 fix the base end portion to a fixing member such as the support rod 1, and the pair of guide rods 27 and 28 are respectively formed with protruding portions 29 and 30 protruding forward. Folded portions 29a and 30a are formed on both or one of the projecting portions 29 and 30 so as to be folded back toward the base at a position lower than the rotary blade 2.

That is, according to the present invention, a relatively thick such bamboo and shrubs, be as repelled by the reaction force of the rotational force of the rotary blade 2, the reaction force that occur I by the rotation of the rotary blade 2 is Then, the object to be cut is acted and pressed against the projecting portion 30 of the guide rod 28 , and is stabilized. Therefore, it is possible to cut a relatively thick bamboo or shrub safely and easily by pushing the entire brush cutter, in other words, the rotary blade 2 forward. At this time, since the projecting portion 30 of the guide rod 28 has the folded portion 30a, the object to be cut is supported at two places above and below the cutting position by the rotary blade, reducing the shake of the brush cutter and enabling stable cutting work. It becomes.

Of the pair of left and right guide rods 27, 28, the protruding dimension of the protruding portion 30 of the guide rod 28 located on the downstream side in the rotational direction of the rotary blade 2 is set to the guide rod located on the upstream side in the rotational direction of the rotary blade 2. It is recommended that the protrusion size of the 27 protrusions 29 be larger.
Further, it is desirable that the folded portions 29a, 30a formed on the protruding portions 29, 30 of the pair of left and right guide rods 27, 28 have a sled shape having inclined portions 29b, 30b. Further, it is desirable that the pair of left and right guide rod portions 27 and 28 are formed integrally and detachable from a fixing member such as the support rod 1.

According to the present invention, an object to be cut can be smoothly taken in, and the object to be cut can be stably supported during cutting. According to the present invention, in addition to operations such as cutting shrubs, the rotary blade can be stably moved so as to slide relative to the ground without cutting into the ground during mowing operations such as weed cutting. In addition , according to the present invention, the entire guide rod is integrated to facilitate handling and improve work efficiency.

According to the brush cutter guide device of the present invention, the reaction force caused by the rotation of the rotary blade 2 is relatively thick, such as bamboo or shrub, and is rebounded by the reaction force of the rotary force of the rotary blade 2. Acts and stabilizes against pressing. Therefore, it is possible to work efficiently.

Hereinafter, preferred embodiments of a brush cutter guide device according to the present invention will be described with reference to the accompanying drawings.
1 is a perspective view of the entire brush cutter with a guide device attached thereto, FIG. 2 is a plan view of only the tip portion of the brush cutter shown in FIG. 1, and FIG. 3 is a perspective view of only the guide device.

  The brush cutter shown in FIG. 1 is provided with a rotation drive means such as an engine 8 or a motor at the base end portion of the support rod 1, and a head portion 3 having a built-in gear at the distal end portion of the support rod 1. A rotary blade such as a tip saw is mounted on the head. As a result, the operator moves the rotary blade 2 attached to the tip with the support rod 1 along the ground, thereby performing weed cutting and weeding operations in the forest.

  A guide device formed by bending a wire is attached to the tip of the support rod 1. As can be understood from FIGS. 2 and 3, the guide device includes an upper guide 4 in which a wire is bent and a lower guide 5 in which the wire is also bent. Thus, the support rod 1 is detachable.

  The rear half of the upper guide 4 is bent in a semicircular shape around the rear outer peripheral edge of the rotary blade 2 at a position above the rotary blade 2 to form the attachment portions 10 and 10 with the support rod 1. A fixing bracket 9 is attached to the portion 10. The front half of the upper guide 4 forms a protrusion 6 that protrudes larger than the outer peripheral edge of the rotary blade 2 on the upstream side of the rotation of the rotary blade 2, that is, on the left side of the center of the rotary blade that rotates counterclockwise. The wire of the upper guide 4 forming the portion 6 bypasses the head portion 3 located at the center of the rotary blade 2 and crosses the rotary blade 2 on the right side of the rotary blade. The transverse portion 4a of the upper guide 4 is formed continuously and integrally with a circulating portion that circulates behind the rotary blade 2.

  The lower guide 5 is extended in the left-right direction of the rotary blade 2 at a position below the rotary blade 2, and both end portions thereof are detachably fixed to the opposing positions of the upper guide 4 with screws 11, 11. The front half of the lower guide 5 that bends the wire rod is a protruding portion that protrudes larger than the outer peripheral edge of the rotary blade 2 on the downstream side of the rotation of the rotary blade 2, that is, on the right side of the center of the rotary blade that is rotating counterclockwise. 7 is formed. The protruding portion 7 of the lower guide 5 and the protruding portion 6 of the upper guide 4 form an introduction portion 12 for the workpiece A while holding a constant width W across the center of the rotary blade 2 that is the extending direction of the support rod 1. is doing. The width W of the introduction part 12 is a width that allows at least a relatively thick workpiece such as bamboo to be cut to pass freely.

In order to cut an object to be cut such as bamboo using the brush cutter provided with the above guide device, the object to be cut is introduced from the introduction unit 12, and the brush cutter is pushed out toward the object to be cut. When the brush cutter is pushed forward, the workpiece A hits the rotary blade 2 as shown in FIG. 4, and cutting is started by a cutting blade such as a tip or a saw blade formed on the outer peripheral edge of the rotary blade 2. The rotation of the rotary blade 2 in the direction of the arrow causes a force to push the workpiece A to the right. However, since the workpiece is in a fixed position, the brush cutter is swung left as a reaction force. At this time, the protrusion 7 of the lower guide 5 positioned below the rotary blade 2 is pressed against and supported by the workpiece A. Therefore, cutting progresses in a stable state, and the operator can safely proceed with cutting work such as bamboo only by pushing forward the head portion 3 of the brush cutter with the rotary blade 2 attached thereto.
In the illustrated embodiment, the brush cutter is pushed forward to perform the cutting operation of the object to be cut. However, when the brush cutter is moved in the left-right direction and the cutting operation is performed, the protrusions 6 and 7 are lateral. It will be formed towards.

  When the cutting is completed, the cut object A is pushed so as to slide on the upper surface of the rotary blade 2 and discharged. At this time, the brush cutter is supported by the ground portion where the cutting object A is left uncut, and there is a risk that the brush cutter is shaken as soon as the cutting operation is completed. It is possible to safely complete the cutting operation. As described above, since the work can be safely performed in a stable state, when the cutting work of one bamboo or the like is completed, the work can be immediately safely transferred to the next cutting work, and the work can be efficiently performed. be able to.

  If the lower guide 5 is loosened and the lower guide 5 is removed and the lower guide 5 is removed, the lower guide 5 is removed when weeding the weeds and the like to move the rotary blade 2 along the ground. It does not get in the way. Therefore, it is possible to proceed with normal mowing work without hindrance. At this time, since the second half of the upper guide 4 circulates around the outer periphery of the rotary blade 2, the operator's safety is secured as a safety cover (safety guard), and weeds that have been cut and dropped on the upper surface of the rotary blade 2. The fine cut object is blocked by the crossing portion 4a of the upper guide, and the cut object can be prevented from scattering as much as possible. Further, the protruding portion 6 protruding forward can be made to act so as to gather grass and the like to be cut at the time of mowing work. Therefore, it is preferable that the crossing portion 4a of the upper guide 4 is curved so that grass and the like gather as much as possible.

  In the embodiment shown in FIGS. 1 to 4, the upper guide 4 and the lower guide 5 are each made of a wire, but as shown in FIGS. 5 and 6, they are made of a strong plate-like member such as a steel plate. You can also. The upper guide 13 of the embodiment shown in FIGS. 5 and 6 is provided with a shaft hole 15 through which a rotation shaft passes in a circular central portion, and four mounting holes 16, 16 slightly outside the shaft hole 15. The latter half is formed in a substantially semicircular shape having a larger diameter than the rotary blade 2. The front half portion of the upper guide 13 forms a protruding portion 17 that protrudes toward the left front side in the drawing, as in the embodiment shown in FIGS. 1 to 4, and the center portion and the right side portion of the upper guide 13 are A transverse part 13a that crosses the rotary blade 2 is formed by cutting in a lateral direction at a position slightly forward from the center. That is, a substantially semicircular shape is used as a basic shape, and the protruding portion 17 is formed on the left side.

  An outer collar 18 is formed in the rear half of the upper guide 13 that is substantially semicircular, and a plurality of attachment holes 19 are formed in the outer collar. The upper guide 13 described above passes the rotating shaft protruding from the head portion 3 of the brush cutter through the shaft hole 15 and is fixed to the flange portion 20 of the head portion 3 with the bolt 21 using the attachment hole 16.

On the other hand, the central portion and the left side portion of the lower guide 14 are cut in the lateral direction at a position behind the circular center, and the protruding portion 22 is formed only on the right side. In the latter half of the lower guide 14 that is substantially semicircular, a rising portion 23 that can maintain a fixed distance from the upper guide 13 is formed so that the rotary blade 2 can freely rotate, and the upper guide 13 is formed at the upper end thereof. The outer casing 24 corresponding to the outer casing 18 is formed, and the mounting hole 25 corresponding to the mounting hole 19 of the upper guide is formed in the outer casing 24. Accordingly, the upper guide 13 and the lower guide 14 can be assembled by tightening the bolts 26 and 26 in the mounting hole 19 and the mounting hole 25, and the lower guide 14 can be removed by removing the bolt 26.
In this embodiment, the latter half of the rotary blade 2 is completely closed by the upper guide 13 and the lower guide 14, and the rotary blade is not exposed, so that it is safer.

  The projecting portion 17 of the upper guide 13 and the projecting portion 22 of the lower guide 14 form a workpiece introduction portion 12 while maintaining a constant width W across the center of the rotary blade 2. The functions of the upper guide 13 and the lower guide 14 when the width is at least the width W through which the cut object such as bamboo passes, or when the cut object such as bamboo or shrub is cut are described with reference to FIGS. This is the same as the case of the embodiment shown in FIG.

  7 to 9 show still another embodiment of the present invention. FIG. 7 is a perspective view, FIG. 8 is a plan view, and FIG. 9 is a side view. The guide device according to this embodiment is constituted by a pair of guide rods 27 and 28 arranged at an interval at which a workpiece such as bamboo or shrub can be introduced at a position above the rotary blade 2, that is, with a constant width W. ing. In the illustrated example, an embodiment in which wires are combined and joined together and formed integrally is shown. However, a plate material may be combined in addition to the wire.

  In the upper position of the rotary blade 2, guide rods 27 and 28 arranged at regular intervals on the left and right are integrally joined at the base end portions thereof, and the distal ends of the guide rods 27 and 28 are as shown in FIG. The protrusions 29 and 30 are formed so as to extend outward from the outer peripheral edge of the rotary blade 2. The protrusions 29 and 30 are respectively folded back at positions below the rotary blade 2 and include folded portions 29a and 30a. The folding manner may be a semicircular arc shape, but in the illustrated embodiment, it is folded by a small arc, and the horizontal folding portions 29a, 30a are provided via the inclined portions 29b, 30b, thereby warping. It has a shape. The tips of the folded portions 29a, 30a are cut off at the lower ends to form small rear end inclined portions 29c, 30c. The folded portion may be configured such that the folded portion 30a is formed only on one of the guide rods 27 and 28, for example, the protruding portion 30 located on the downstream side in the rotation direction of the rotary blade 2. In any case, both or either of the guide rods 27 and 28 are folded back to the lower position so as to embrace the periphery of the rotary blade from the upper position of the rotary blade 2 as shown in FIG.

  The projecting dimensions of the left and right guide rods 27 and 28 may be the same, but in the illustrated embodiment, the projecting dimension of the guide rod 27 located on the upstream side of the rotation of the rotary blade 2 is small, and The protruding dimension of the guide rod 28 located on the downstream side of the rotation is formed large. Thereby, taking up of a to-be-cut object can be performed moderately, and a to-be-cut object can be supported reliably.

  The guide rods 27 and 28 are joined at the base end portion and extended backward to form a mounting screw portion 31, and reinforcing rods 32 and 33 are joined to the upper surfaces of the guide rods 27 and 28. Further, the reinforcing rods 32 and 33 are joined, and the reinforcing rod 33 is extended rearward to form a mounting screw portion 34. Thus, the entire guide device is made detachable by clamping the support rod 1 of the brush cutter with the fixtures 35 and 36 attached to the attachment screw portion 31 and the attachment screw portion 34 and tightening the nut 37.

  The guide device shown in FIGS. 7 to 8 has the same function as the guide device of the embodiment shown in FIG. 2 corresponds to the protrusion 29 in the embodiment shown in FIG. 7, and the protrusion 7 in FIG. 2 corresponds to the folded portion 30a of the protrusion 30 in FIG. At this time, in the embodiment shown in FIG. 7, the guide rod 30 positioned on the downstream side in the rotation direction of the rotary blade 2 has a folded structure. And since it cut | disconnects by the rotary blade 2 in the intermediate position of a support, the reaction force of cutting resistance is applied equally and a rotation moment does not act on a brush cutter. That is, it is different in that the brush cutter can be used stably without shaking.

  Furthermore, the folded portions 29a, 30a of the guide rods 29, 30 have a sled shape, so that the folded portions 29a, 30a can be stably slid in a grounded state, and a fixed dimension position can be moved from the ground surface. Can do. Therefore, the mowing work such as weeds and bushes can be efficiently performed in a state where the cutting size from the ground surface is constant. In addition, since the rear end inclined portions 29c and 30c are also formed at the rear end portion of the folded portion, when the brush cutter is moved forward (in the cutting operation direction, forward or left-right direction), the ground surface is It is possible to move back without being caught.

  As another use method, the protruding portion of the sled-shaped guide rod is moved in contact with an obstacle such as a rod or a foundation stone, so that the rotary blade 2 can be safely trimmed without directly contacting the obstacle. Work can be done. As described above, the present invention has the feature that not only can bamboo and shrubs be cut safely, but also the work can be carried out safely and efficiently even in normal mowing work.

  In the illustrated embodiment, the folded portions 29a and 30a are formed on both of the pair of guide rods 27 and 28 disposed above the rotary blade 2, but the folded portion is formed only on one of the guide rods. It may be formed. That is, even if the turning portion is formed only on the guide rod 28 on the downstream side of the rotation of the rotary blade 2, it is possible to cut shrubs and the like stably, and the rotary blade 2 on the upstream side of the rotation. In the case where the folded portion is formed only on the guide rod 27, it can function as a guide for sliding the brush cutter.

FIG. 1 is a perspective view of the entire bush cutter attached with a guide device, FIG. 2 is a plan view of only the tip portion of the brush cutter shown in FIG. FIG. 3 is a perspective view of only the guide device, FIG. 4 is a schematic diagram showing a cutting situation when cutting an object, FIG. 5 is a plan view of only a tip portion of a brush cutter attached with a guide device according to another embodiment; 6 is a perspective view of only the guide device of the embodiment shown in FIG. FIG. 7 is a perspective view of only a guide device according to another embodiment, 8 is a plan view of the guide device shown in FIG. FIG. 9 is a side view of the guide device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Support rod, 2 ... Rotary blade, 3 ... Head part, 4 ... Upper guide, 4a, 13a ... Crossing part, 5 ... Lower guide, 6, 7 ... Projection part, 8 ... Engine, 9 ... Fixing bracket, 10 ... Mounting part, 11 ... Screw, 12 ... Introduction part, 13 ... Upper guide, 14 ... Lower guide, 15 ... Shaft hole, 16 ... Mounting hole, 17 ... Projection, 18 ... Outer rod, 19 ... Mounting hole, 20 ... 鍔Part, 21 ... bolts,
22 ... Projection, 23 ... Rising, 24 ... Outer flange, 25 Mounting hole, 26 ... Bolt, 27, 28 ... Guide rod, 29, 30 ... Projection, 29a, 30a ... Folded, 29b, 30b ... Inclined , 29c, 30c ... rear end inclined part, 31, 34 ... mounting screw part, 32, 33 ... reinforcing rod, 35, 36 ... fixing tool, 37 ... nut.

Claims (8)

This is a guide device for a brush cutter that is equipped with a head portion that attaches a rotary blade to the tip of a support rod, and that is attached to a brush cutter that cuts an object to be cut such as grass, shrubs, or bamboo with the rotary blade attached to the head portion. Te, have a protruding portion into an upper stream side of the rotary blade and the downstream side, the upstream side of the protrusion is greater protrudes from the outer peripheral edge of the rotary blade, the outer peripheral edge of the rotation blade for the projecting portion of the lower stream side greater protrudes than the introduction portion of the object to be cut between the protrusion of the upper stream side and lower stream side projection is formed, introducing the object to be cut between the protruding portion of the upstream side and the downstream side projecting portion A guide device for a brush cutter, characterized in that it can be used. Brushcutter guide device according to claim 1 which protrusion is characterized that you have been formed toward the side of the support rod direction as a reference. This is a guide device for a brush cutter that is equipped with a head portion that attaches a rotary blade to the tip of a support rod, and that is attached to a brush cutter that cuts an object to be cut such as grass, shrubs, or bamboo with the rotary blade attached to the head portion. Te, have a protrusion protruding from the outer peripheral edge of the rotary blade in the upper stream side of the rotary blade and the downstream side, the projecting portion of the downstream toward the side of the rotary blade supporting rod direction basis projecting brush cutter guide apparatus characterized by protrusions of the downstream side press and against being reaction force to be cut portion is supported at the time of cutting. The pair of guide rods has a base end portion fixed to a fixing member such as a support rod, and the protruding portions are formed by the pair of guide rods. The guide apparatus for brush cutters in any one of thru | or 3. 5. The brush cutter guide device according to claim 4, wherein a folded portion that is folded back toward the base at a position below the rotary blade is formed on both or any one of the protruding portions. Of the pair of left and right guide rods, the protruding dimension of the protruding portion of the guide rod located on the downstream side in the rotation direction of the rotary blade is larger than the protruding size of the protruding portion of the guide rod located on the upstream side in the rotational direction of the rotary blade. The guide device for a brush cutter according to claim 4 or 5 , wherein the guide device is large. The guide device for a brush cutter according to any one of claims 4 to 6 , wherein the folded portion formed on the protruding portions of the pair of left and right guide rods has a sled shape in which the folded portion has an inclined portion. The brush cutter guide device according to any one of claims 4 to 7 , wherein the pair of left and right guide rods are integrally formed and detachable from a fixing member such as a support rod.