JP2011167075A - Protective body and brush cutter equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To a protective body that achieves the whole weight reduction and yet further lightens an economical load when exchanged and a brush cutter equipped with the same. <P>SOLUTION: The protective body A includes a press metal fitting 3 that is mounted so as to be integrally rotated together with a drive shaft 2 in a state in which the drive shaft 2 of the brush cutter B is inserted into the pressing metal fitting, a protective part 5 made of a synthetic resin so as to hold the lower end part of the drive shaft 2, and a connection structure for detachably connecting the press metal fitting 3 to the protective part 5, and rotates the protective part 5 integrally with the drive shaft 2 in a state in which the press metal fitting 3 is linked to the protective part 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a protector used by being mounted on a drive shaft of a brush cutter.

  As a protector to be attached to the drive shaft of a brush cutter, a presser fitting that is attached so as to rotate integrally with the drive shaft of the brush cutter and a synthetic resin protection portion are integrally molded ( For example, see Patent Document 1). According to such a protector, the presser fitting can be made of a high strength member, and the protective portion can be made of resin to reduce the overall weight.

  However, as described above, when the presser fitting and the synthetic resin protective part are integrated, there is a large difference in use between the presser fitting replacement time and the protective part replacement time. There's a problem. In other words, if the protective part made of synthetic resin is worn out and the replacement time is reached, it is necessary to replace the entire protective body with a new one even if the high strength presser bracket itself has not reached the replacement time. The problem is that it is an economy.

  Also, when trying to use various protectors according to the situation, it is necessary to prepare a dedicated protector and replace the entire protector, which is also uneconomical.

JP 2008-295465 A

  The present invention has been invented to solve such problems, and provides a protector capable of reducing the economic burden during replacement while achieving overall weight reduction. Let it be an issue. Furthermore, it is an object to provide a brush cutter provided with this protector.

  In order to solve the above-mentioned problem, the protector A according to the present invention includes a presser fitting 3 that is mounted so as to rotate integrally with the drive shaft 2 while the drive shaft 2 of the brush cutter B is inserted, and a lower end of the drive shaft 2. A protection portion 5 made of synthetic resin formed so as to accommodate the portion and a coupling structure for detachably coupling the presser fitting 3 and the protection portion 5, with the presser fitting 3 and the protection portion 5 being coupled, It is assumed that the protection unit 5 is provided so as to rotate integrally with the drive shaft 2.

  By doing in this way, when one of the presser fitting 3 and the protective part 5 comes to the replacement time first, the presser fitting 3 and the protective part 5 are separated, and one of them is replaced with a new one. can do. In addition, the protection unit 5 can be replaced with an appropriate one according to the situation.

  Further, in order to solve the above-mentioned problem, the protector A of the present invention is formed by a presser fitting 3 that is mounted so as to rotate integrally with the drive shaft 2 while the drive shaft 2 of the brush cutter B is inserted, and insert molding. A synthetic resin fitting holder 30 molded integrally with the presser fitting 3, a synthetic resin protection portion 5 formed so as to accommodate the lower end portion of the drive shaft 2, and the fitting holder 30 and the protection portion 5 are attached and detached. It is good also as what provided the coupling | bonding structure combined freely and provided so that the protection part 5 might be rotated integrally with the drive shaft 2 in the state which couple | bonded the metal fitting holding body 30 and the protection part 5. FIG.

  By doing in this way, if one of the metal holding body 30 (holding metal 3) and the protective part 5 comes first, the metal holding body 30 and the protective part 5 were separated and one of them was replaced with a new one. It can be recombined and used. In addition, the protection unit 5 can be replaced with an appropriate one according to the situation. Further, since there is no need to provide a coupling structure on the side of the presser fitting 3, the metal presser fitting 3 itself can be made as compact as possible to realize further weight reduction and cost reduction of the entire protective body A.

  In the protection body A of the present invention, it is preferable that the presser fitting 3 is configured to sandwich the rotary blade 1 with the receiving fixture 10 of the brush cutter B and rotate the rotary blade 1 integrally with the drive shaft 2. . According to this, the mowing work can be performed by the rotary blade 1 securely held between the high-strength metal fittings 3 and 10.

  Moreover, in the protection body A of the present invention, it is also preferable that the protection part 5 is one that rotates the rope cutter 7 integrally. According to this, using the rope cutter 7 that rotates together with the protection unit 5, it is possible to perform mowing work safely even near an obstacle such as a concrete wall.

  Moreover, in the protection body A of the present invention, it is also preferable that the protection part 5 is in sliding contact with the ground surface E. According to this, since the lightweight protective part 5 made of resin can be used as a grounding body and a stable posture can be maintained for a long time, the load of mowing work is greatly reduced.

  And in order to solve the said subject, the brush cutter B of this invention is good also as what was equipped with the protection body A which consists of the said structure.

  According to the present invention, while achieving the weight reduction of the protector attached to the drive shaft of the brush cutter, it is possible to further reduce the economic burden at the time of replacement.

It is principal part side sectional drawing which shows the brush cutter in the state which attached the protector of the 1st example in embodiment of this invention. It is a perspective view which shows the state which removed the pressing metal fitting of the protection body same as the above. It is a perspective view of a brush cutter same as the above. It is a perspective view which shows the protection part of another form used for a protection body same as the above. It is a perspective view which shows the modification of the attachment / detachment structure of the same holding metal fitting. It is a perspective view which shows the other modification of the attachment or detachment structure of a clamp metal same as the above. It is principal part sectional drawing which shows the brush cutter in the state which attached the protection body of the 2nd example in embodiment of this invention. It is a perspective view which shows the state which removed the metal fitting holding body of the protection body same as the above. The holding metal fittings arranged on the same metal holding body are shown, (a) is a plan view and (b) is a cross-sectional view.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  First, the protector A of the first example and the brush cutter B having the same according to the embodiment of the present invention will be described. FIG. 1 shows a state in which the protector A of the first example is attached to the brush cutter B. FIG. 2 is a perspective view of the protector A, and FIG. 3 is a perspective view of the brush cutter B.

  The brush cutter B is obtained by inserting a rotary shaft 32 into the hollow main shaft 14, and forms a horizontal rotation conducting portion at the tip of the rotary shaft 32. A drive shaft 2 (see FIG. 1) is suspended from the horizontal rotation conducting portion, and the rotary blade 1 such as a tip saw is attached to the drive shaft 2 by a fastening means from below.

  A handle 13 is provided in the middle of the main shaft 14 of the brush cutter B. An engine 15 is mounted on the base end side of the main shaft 14, and the rotary blade 1 is rotationally driven by the drive of the engine 15 through the rotary shaft 32, the horizontal rotation conducting portion, and the drive shaft 2. A safety cover 16 and a shoulder strap 12 are further attached to the main shaft 14, and the handle 13 is held after the shoulder strap 12 is hung on the shoulder, and the mower B is swung left and right to cut the grass.

  The protection body A of the first example attaches the rotary blade 1 to the brush cutter B, and rotates together with the drive shaft 2 and the rotary blade 1 to make sliding contact with the ground surface E. The protector A is a recess that accommodates a cylindrical presser fitting 3 that is attached by inserting the drive shaft 2 of the brush cutter B and a lower end portion (a male screw portion 19 described later) of the drive shaft 2 that is inserted through the presser fitting 3. It is formed with the protection part 5 which has the place 4 inside.

  The protective part 5 is a light-weight synthetic resin member having a sufficient strength, and a tubular part 40 penetrating vertically, and a bowl-like shape extending from the lower end part of the tubular part 40 in the outer peripheral direction. Part 41. The presser fitting 3 is detachably coupled to the synthetic resin protection part 5.

  The bottom part of the protection part 5 is a part composed of a lower end part of the cylindrical part 40 and a base end part of the flange-like part 41, and this part becomes the wear-resistant part 11 formed thicker than other thicknesses. Yes. In the upper part of the wear-resistant part 11 (upper part of the base end part of the bowl-shaped part 41), a plurality of recesses 33 for life confirmation are formed at intervals in the circumferential direction. Since the wear-resistant portion 11 is a portion whose bottom surface is in sliding contact with the ground surface E, when the wear-resistant portion 11 is worn more than a certain amount from the bottom side, the recess 33 is exposed to the bottom side of the wear-resistant portion 11. By confirming this visually, the user knows that the protection unit 5 is in the replacement period.

  The protection part 5 and the presser fitting 3 are integrated by a screw-type attachment / detachment structure. The inner peripheral surface of the cylindrical portion 40 penetrating up and down the protective portion 5 is continuous with a lower inner peripheral surface 42 surrounding the recess 4 and an upper inner peripheral surface 43 having a larger diameter through a step 44 in the vertical direction. An internal thread is formed on the upper inner peripheral surface 43. On the outer peripheral surface 45 of the presser fitting 3 having a cylindrical shape, a male screw having a size and shape to be screwed with the female screw is formed. When the presser fitting 3 is fitted into the upper opening of the cylindrical portion 40 of the protective part 5 and is screwed downward, the presser fitting 3 is attached to the protective part 5 without a gap at a predetermined position where it abuts the step 44. And integrated.

  A male screw portion 19 is formed at the lower end portion of the drive shaft 2 of the brush cutter B, and a spline shaft portion 18 is formed above the male screw portion 19. The spline shaft portion 18 of the drive shaft 2 is fitted with the central spline hole 20 of the receiving metal fitting 10 provided as a fixture on the brush cutter B side.

  When attaching the rotary blade 1 using the protector A, first, the upper surface of the rotary blade 1 is brought into contact with the receiving surface 27 provided on the lower surface of the receiving metal fitting 10. At this time, the boss 22 projecting from the central portion of the lower surface of the metal fitting 10 is fitted into the circular insertion hole 21 that the rotary blade 1 has in the center. A portion on the outer peripheral side of the boss 22 of the receiving metal 10 becomes a receiving surface 27 for attaching the rotary blade 1.

  And the drive shaft 2 is inserted in the insertion hole 23 which the presser fitting 3 of the protection body A has in the center. Since the male threaded portion 19 of the drive shaft 2 protrudes into the recess 4 through the insertion hole 23 of the presser fitting 3, the nut 24 is lowered below the male threaded portion 19 of the drive shaft 2 in the recess 4. Can be screwed in.

  When the nut 24 is screwed upward, an upward pressing force is applied to the presser fitting 3 (and thus the entire protection body A). With the pressing force, the rotary blade 1 is clamped and fixed between the receiving surface 27 of the receiving metal 10 and the rotary blade mounting surface 8 which is the upper surface of the holding metal 3.

  According to the protector A of the first example having the above configuration, the rotary blade 1 can be firmly sandwiched and fixed between the metal fitting 10 that is also made of metal by the presser fitting 3 that is located at the upper end portion thereof. .

  In addition, the protective portion 5 that accommodates the lower end portion of the drive shaft 2 is a synthetic resin member that is molded as a very light weight compared to metal while maintaining sufficient strength. For this reason, the lightweight protective part 5 is used as a grounding part (that is, the protective body A is used as a grounding body), and the mowing work can be easily performed while being in sliding contact with the ground surface E.

  By the way, in the first example, through holes 6 are formed in the lower part of the cylindrical part 40 that forms the protective part 5 and the tip part of the hook-like part 41, and a synthetic resin is formed in each through hole 6. A flexible string-shaped rope cutter 7 made of metal is inserted. A large-diameter portion 25 is formed at the end of the rope cutter 7 by caulking or the like, and the large-diameter portion 25 is locked to the lower inner peripheral surface 42 of the tubular portion 40, so that the rope cutter 7 We are trying to prevent it.

  When removing the rope cutter 7 from the protective portion 5, it is only necessary to insert a hand from the side of the recess 4 that opens downward and to pull out the rope cutter 7 from the through hole 6 with the large diameter portion 25. Moreover, the operation | work which penetrates the rope cutter 7 to the through-hole 6 can also be performed from the recess 4 side. As described above, in this example, it is designed so that the rope cutter 7 can be replaced from the recess 4 side of the protective part 5, but various designs can be adopted as a configuration that allows the rope cutter 7 to be replaced. It is.

  According to the protector A, the rotary blade 1 and the rope cutter 7 can be used in combination. At the time of combined use, the rotation trajectory of the rope cutter 7 is made larger than the rotation trajectory of the rotary blade 1 so that the tip of the rope cutter 7 passes outside the rotary blade 1. Therefore, the grass near the obstacle can be safely cut by the flexible rope cutter 7 without bringing the rotary blade 1 into contact with an obstacle such as a concrete wall or a stone block. At this time, the protector A that is in sliding contact with the ground surface E maintains the rope cutter 7 and the rotary blade 1 at a predetermined height from the ground surface E, respectively.

  Moreover, according to the said protection body A, the rotary blade 1 can be removed and grass can be cut only with the rope cutter 7. FIG. A protective body mounting surface 9 to which the protective body A is attached when the rotary blade 1 is removed is formed below the rotary blade mounting surface 8 through a step on the inner periphery side of the rotary blade mounting surface 8 of the presser fitting 3. is doing. The lower surface of the boss 22 formed on the receiving bracket 10 on the brush cutter B side is a protective body receiving surface 28 that is one step lower than the receiving surface 27.

  As shown in FIG. 1, when the rotary blade 1 is attached, a gap G is formed between the protective body receiving surface 28 of the receiving metal fitting 10 and the protective body attaching surface 9 of the holding metal fitting 3. The gap G is provided so as to be thinner than the thickness of the rotary blade 1. Accordingly, when the rotary blade 1 is removed and the protector A is attached, the presser fitting 3 approaches the protector A side by the gap G, and the protector mounting surface 9 of the presser fitting 3 is the protector receiving surface 28 of the catcher 10. Abut. If the protector A is attached in this state, only the rope cutter 7 can be mowed. Of course, mowing with only the rotary blade 1 is also possible.

  And in the said protection body A, the synthetic resin formed so that the presser fitting 3 with which the drive shaft 2 of the brush cutter B was penetrated, and the lower end part of the drive shaft 2 with which the brush cutter B was mounted | worn may be accommodated. Since the protective portion 5 is detachably provided with a screw type, the protective portion 5 made of synthetic resin is worn by sliding contact with the ground surface E, and the recess 33 penetrates to the bottom surface side at the time of replacement. When knowing that there is, only the protection part 5 can be replaced with a new one. That is, since it is not necessary to replace the presser fitting 3 side that has not yet reached the replacement time, the cost can be reduced. When the presser fitting 3 side comes to the replacement time, it is sufficient to replace only the presser fitting 3 while leaving the protective part 5 side as it is.

  Further, according to the protector A, the protector 5 can be properly used depending on the situation. In this case, for example, protective parts 5 having different dimensions and materials can be prepared and used appropriately.

  FIG. 4 shows another form of the protection unit 5. In this protection part 5, it forms so that the outer-periphery edge part 41a of the collar-shaped part 41 may stand | start up, and the ditch | groove 46 opened to a radial direction outer side is formed over the perimeter of this outer-perimeter edge part 41a. The through hole 6 on the side of the flange-shaped portion 41 is opened at the bottom surface of the groove 46. In addition, a pair of insertion passages 47 are formed on the upper surface of the bowl-shaped portion 41 to connect the outer peripheral edge portion 41a of the bowl-shaped portion 41 and the cylindrical portion 40 located inside thereof. The insertion passage 47 is a passage through which the through-holes 6 on the cylindrical portion 40 side and the flange-like portion 41 side communicate with each other on a one-to-one basis. In this protection part 5, guidance is provided when the rope cutter 7 is inserted through the insertion passage 47 so that the user can easily replace the rope cutter 7.

  Moreover, as the protection part 5, the thing for exclusive use of the rotary blade 1 which does not have the structure which mounts the rope cutter 7, and the thing for exclusive use of the rope cutter 7 can be prepared, and it can also use suitably. The rope cutter 7 is dedicated to the rope cutter 7, and when the tip of the rope cutter 7 is worn away by use, the rope cutter 7 It is also suitable to use a well-known structure that can be extended.

  5 and 6 show modified examples of the coupling structure in which the presser fitting 3 and the protective portion 5 are detachably coupled. In this modified example, a fitting type coupling structure is employed instead of the screw type. Here, the protection part 5 of the type which is not provided with the through-hole 6 or the recess 33 is shown.

  In the coupling structure of FIG. 5, a plurality of recesses 50 are formed on the outer peripheral surface 45 of the cylindrical presser fitting 3 at intervals in the circumferential direction, and the upper part of the cylindrical part 40 that forms the protective part 5. On the inner peripheral surface 43, convex portions 51 are respectively formed at locations where the recesses 50 on the side of the presser fitting 3 are fitted one-on-one. In other words, the presser fitting 3 and the protective portion 5 are detachably integrated by fitting the recess 50 and the convex portion 51, but the presser fitting 3 side is convex and the protective portion 5 side is concave to fit. There may be.

  In the coupling structure of FIG. 6, a plurality of engagement holes 55 penetrating in the radial direction are formed in the cylindrical presser fitting 3 at intervals in the circumferential direction. From the outer peripheral surface of the cylindrical part 40 which forms the protection part 5, the elastic piece 56 is integrally extended so that a front-end | tip may spread outside. The elastic pieces 56 are arranged at intervals in the circumferential direction so that the tip ends thereof are fitted into the engagement holes 55 on the presser fitting 3 side from the inside. That is, when the distal end portion of the elastic piece 56 made of synthetic resin is fitted into the engagement hole 55, the presser fitting 3 and the protection portion 5 are detachably integrated. Of course, the present invention is not limited to these, and other coupling structures may be adopted.

  Next, the protector A of the second example and the brush cutter B having the same according to the embodiment of the present invention will be described. FIG. 7 shows a state in which the protection body A of the second example is attached to the brush cutter B. FIG. 8 shows the protector A, and FIG. 9 shows the presser fitting 3 provided in the protector A. In the following, detailed description of the same configuration as in the first example will be omitted, and only the characteristic configuration different from the first example will be described in detail.

  In the protector A of the second example, the presser fitting 3 attached to the brush cutter B with the drive shaft 2 inserted is formed integrally with a cylindrical metal fitting holder 30 made of synthetic resin by insert molding. ing. The metal fixture 30 and the protection unit 5 are integrated by a screw-type attachment / detachment structure.

  The screw-type attachment / detachment structure here is the same structure as the screw-type attachment / detachment structure in which the presser fitting 3 and the protection portion 5 are integrated in the first example. That is, a female screw is formed on the upper inner peripheral surface 43 of the cylindrical portion 40 that forms the protective portion 5, and the outer peripheral surface 31 of the cylindrical metal fitting holder 30 is sized and shaped to be screwed with the female screw. A male screw is formed. When the metal fitting holder 30 is fitted into the upper opening of the cylindrical portion 40 forming the protection portion 5 and screwed downward, the metal fitting holding body 30 is at a predetermined position where it abuts on the step 44 of the cylindrical portion 40. It is attached to the protection part 5 without a gap and integrated.

  According to the protector A of the second example having the above-described configuration, the rotary blade 1 is firmly clamped and fixed between the holding metal 10 provided on the brush cutter B side by the presser metal 3 exposed at the upper end portion thereof. It is also possible to use the rotary blade 1 and the rope cutter 7 in combination.

  In the presser fitting 3 of the second example, a plurality of stepped through holes 17 are formed at intervals in the circumferential direction (see FIG. 9). Each through-hole 17 is filled with a synthetic resin portion 35 (see FIG. 7) of the metal fitting holder 30 at the time of insert molding. Thereby, the connection strength between the presser fitting 3 and the metal fitting holding part 30 is sufficient.

  In the following, the configurations of the presser fitting 3 and the metal fixture 30 will be described in more detail.

  As shown in FIG. 9, the presser fitting 3 of the second example is a dish-shaped metal member having a step formed by press molding. An annular portion 34 higher than the others is formed on the outer peripheral upper edge provided one step higher than the presser fitting 3. The upper surface of the annular portion 34 becomes the rotary blade mounting surface 8 for mounting the rotary blade 1.

  The inner diameter F of the annular portion 34 is set equal to the outer diameter of the boss 22 of the metal fitting 10 that is the equipment on the brush cutter B side, and the inner peripheral surface of the annular portion 34 abuts the outer peripheral surface of the boss 22 over the entire circumference. Thus, the protective body A is centered.

  The upper surface of the synthetic resin portion 35 introduced into the through hole 17 of the presser fitting 3 is molded so as to be substantially flush with the rotary blade mounting surface 8 of the annular portion 34. Further, a taper 38 is formed by chamfering at the hole edge of the through hole 17 and the upper outer edge of the annular portion 34. As the synthetic resin wraps around the taper 38, the bonding strength between the presser fitting 3 and the protective portion 5 is further increased.

  Abutting ribs 36 are raised at the radially intermediate portion of the annular rotary blade mounting surface 8 so as to connect adjacent through holes 17 in the circumferential direction. The height of the contact rib 36 is about 0.02 mm, but can be changed as appropriate.

  That is, between the adjacent contact ribs 36, 36, there is a top surface of the synthetic resin portion 35 that is substantially flush with the rotary blade mounting surface 8 and is lowered by the height of the contact rib 36. Become. The contact rib 36 is divided in the circumferential direction by the through hole 17 (synthetic resin portion 35) to form an arc shape, but the contact rib 36 as a whole is formed in an annular shape.

  Therefore, even if the presser fitting 3 is distorted during press molding or punching of the through hole 17 and the rotary blade mounting surface 8 is distorted, it is one step higher than the rotary blade mounting surface 8 and annularly. The formed contact rib 36 stably contacts the rotary blade 1. Since the contact of the contact rib 36 with the lower surface of the rotary blade 1 is stabilized, the rotary blade 1 can be mounted satisfactorily.

  As shown in FIG. 7, when the rotary blade 1 is attached, a gap G is formed between the protective body receiving surface 28 of the metal fitting 10 and the protective body attaching surface 9 of the holding metal fitting 3, and the rotary blade 1 is removed. When the protective body A is attached, the protective body mounting surface 9 that is one step lower than the rotary blade mounting surface 8 of the presser fitting 3 comes into contact with the protective body receiving surface 28 of the receiving metal fitting 10. If the protector A is attached with the rotary blade 1 removed, only the rope cutter 7 can be mowed as in the case of the first example.

  In the protective body A of the second example, a synthetic resin-made metal holder 30 in which the presser metal fitting 3 is insert-molded, and a synthetic-resin-made protective part 5 formed so as to accommodate the lower end of the drive shaft 2; Since the protective part 5 is worn and the recess 33 is exposed from the bottom side, only the metal holding body 30 integrated with the holding metal 3 is replaced. This can be done and the cost can be reduced.

  Further, since there is no need to provide a coupling structure on the side of the presser fitting 3, the presser fitting 3 itself can be miniaturized as much as possible. Further weight reduction and cost reduction of the whole A are achieved.

  Furthermore, according to the protector A of the second example, the protector 5 can be used properly according to the situation. The protective part 5 is used in the same manner as in the first example, and it is preferable to prepare a different dimensional shape and material, a dedicated one for the rotary blade 1 and a special one for the rope cutter 7 and use them appropriately. .

  Further, the coupling structure for detachably coupling the metal holding body 30 and the protection unit 5 is not limited to the screw type, but adopts a fitting type coupling structure similar to that shown in FIGS. 5 and 6 of the first example. Alternatively, other coupling structures may be employed.

  Although the present invention has been described based on the embodiments shown in the accompanying drawings, the present invention is not limited to the above-described embodiments, and appropriate design changes can be made within the intended scope of the present invention. Is possible.

DESCRIPTION OF SYMBOLS 1 Rotating blade 2 Drive shaft 3 Presser fitting 5 Protection part 7 Rope cutter 10 Receptacle 30 Bracket holding body A Protection body B Brush cutter E Ground surface

Claims (6)

  A presser fitting that is mounted so as to rotate integrally with the drive shaft in a state where the drive shaft of the brush cutter is inserted, a protective part made of synthetic resin formed so as to accommodate the lower end portion of the drive shaft, a presser fitting, and a protection And a protective structure, wherein the protective part is provided so as to rotate integrally with the drive shaft in a state where the presser fitting and the protective part are joined.   A presser fitting that is mounted to rotate integrally with the drive shaft while the drive shaft of the brush cutter is inserted, a synthetic resin bracket holder that is integrally formed with the presser fitting by insert molding, and a lower end portion of the drive shaft A protective part made of synthetic resin formed so as to accommodate the metal, and a coupling structure for detachably coupling the bracket holder and the protective part, and driving the protective part in a state where the bracket holder and the protective part are coupled A protector provided to rotate integrally with a shaft.   The protector according to claim 1 or 2, wherein the presser fitting sandwiches the rotating blade with a receiving bracket of the brush cutter and rotates the rotating blade integrally with the drive shaft.   The protector according to any one of claims 1 to 3, wherein the protector rotates the rope cutter integrally.   The protector according to any one of claims 1 to 4, wherein the protector is in sliding contact with the ground surface.   A brush cutter comprising the protector according to any one of claims 1 to 5.

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