JP2003111509A - Hand-pushed bush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand-pushed bush cutter capable of safely and simply conducting mowing operation without requiring skill. SOLUTION: This hand-pushed bush cutter is provided with a frame 2 holding an engine 1, a pair of left and right wheels 3 and 3 disposed at the lower end 23b of the frame 2, a handle 4 disposed on the upper end 23a of the frame 2 and a mowing blade 5 disposed in front of the pair of left and right wheels 3 and 3 and rotated by the engine 1. In the hand-pushed bush cutter, the wheels 3 and 3 are formed into a barrel shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-type brush cutter.

[0002]

2. Description of the Related Art A conventional hand-operated brush cutter has a frame for holding an engine, a pair of left and right wheels provided at a lower end of the frame, a handle provided at an upper end of the frame, and a pair of left and right wheels. A blade provided with a cutting blade which is provided in front and which is rotated by an engine is known. When cutting grass with this hand-operated brush cutter, the operator holds the handle while moving it forward while pushing the mowing blade to a certain height, and swinging the handle to the left or right to rotate the mowing blade. I used to shake it to the left and right to cut wide.

[0003]

However, since the width (thickness) of the wheel of this conventional hand-operated brush cutter is small, when cutting grass in a place where the unevenness of the ground is severe, the wheel is not a concave part of the ground. It is easy to fit, so the brush cutter cannot be tilted greatly to the left or right or cannot be pushed forward smoothly by hand, and since the handle is installed at a high position, it is difficult to shake it to the left and right to cut wide grass, etc. It was difficult and dangerous, so it was difficult for an adult expert to master it.

[0004] Therefore, an object of the present invention is to provide a hand-operated brush cutter capable of safely and easily performing grass cutting work without requiring skill.

[0005]

In order to achieve the above object, a hand-operated brush cutter according to the present invention comprises a frame for holding an engine, a pair of left and right wheels provided at the lower end of the frame, A handle provided on the upper end of the frame,
In a hand-operated brush cutter equipped with a cutting blade which is provided in front of the pair of left and right wheels and which is rotated by the engine, the wheels are formed in a barrel shape.

A frame for holding the engine, a pair of left and right wheels provided at a lower end of the frame, a handle provided at an upper end of the frame, and a engine provided at the front of the pair of left and right wheels. In a hand-operated brush cutter equipped with a mowing blade that rotates at, the pair of left and right wheels are attached to an axle so that the vehicle width can be adjusted.

A frame for holding the engine, a pair of left and right wheels provided at a lower end of the frame, a handle provided at an upper end of the frame, and a engine provided at a front of the pair of left and right wheels. In a hand-operated brush cutter equipped with a cutting blade that rotates at a position, the tip end side of the handle is vertically and vertically oriented.

A frame for holding the engine, a pair of left and right wheels provided at a lower end of the frame, a handle provided at an upper end of the frame, and a engine provided at the front of the pair of left and right wheels. In a hand-operated brush cutter equipped with a cutting blade that rotates with, an angle adjusting mechanism is provided at a connecting portion between the base end of the handle and the upper end of the frame, and the handle of the handle is attached by the angle adjusting mechanism. By adjusting the vertical inclination angle on the base end side, the vertical height on the distal end side can be adjusted.

Further, a frame for holding the engine, a pair of left and right wheels provided at the lower end of the frame, a handle provided at the upper end of the frame, and a holding member provided so as to project downward from the engine in a forwardly inclined manner. A hand-operated brush cutter equipped with a cutting blade which is provided at a tip of a rod and which is rotated by an engine, wherein an extendable blade height adjuster having a sliding contact plate slidably contacting the ground is attached to the holding rod. The height of the cutting blade can be adjusted with the blade height adjusting tool.

Further, a frame for holding the engine, a pair of left and right wheels provided at the lower end of the frame, a handle provided at the upper end of the frame, and a holding member projecting from the engine in a forward downward inclination. A hand-operated brush cutter provided with a cutting blade provided at a tip of a rod and rotated by an engine, the cutting blade being attached to the tip so as to swing around the holding rod, and a cutting blade angle. Is adjustable.

Further, a frame for holding the engine, a pair of left and right wheels provided at the lower end of the frame, a handle provided at the upper end of the frame, and a holding member projecting downwardly from the engine in a forward inclined manner. A hand-operated brush cutter provided with a cutting blade which is provided at a tip of a rod and which is rotated by an engine, having a sphere that rolls on the ground, and has a large number of spheres that rotatably hold the sphere. And a blade height adjusting tool provided with a hemispherical shell-shaped receiving member for forming a gap between the small sphere and the spherical upper half of the sphere to hold a large number of the small sphere in the gap. It is attached and the height of the cutting blade can be adjusted by the blade height adjusting tool.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings showing the embodiments.

1 and 2 show a first embodiment of the present invention. As shown in the side view of FIG. 1 and the perspective view of FIG.
The hand-operated brush cutter according to the present invention includes a frame 2 that holds an engine 1, a pair of left and right wheels 3 and 3 provided at a lower end 23b of the frame 2, and a handle 4 provided at an upper end 23a of the frame 2. The cutting blade 5 is provided in front of the pair of left and right wheels 3 and 3 and is rotated by the engine 1. The cutting blade 5 is made of a plastic string-like body, and is attached to the rotary disc 49 so as to project radially outward (see FIG. 8).

The frame 2 has a prismatic center frame 6 whose upper end is inclined rearward, a plate 7 attached to the front face of the center frame 6 and at an upper and lower intermediate position, and a front face of the center frame 6 and an upper end side thereof. Support rod 8 for attaching the handle, and a frame body in which both ends of the pipe body are bent in a U shape are fixed to the front surface of the plate 7 and are bent in a substantially J shape in side view, and the front end side is inclined forward. 9 and.

The axle is attached to the lower end of the center frame 6.
A pair of left and right wheels 3, 3 are rotatably mounted via a handle 10, and a handle 4 is mounted on an upper end of a support rod 8 projecting above the center frame 6 via an angle adjusting mechanism 11 (described later). ing. Also, the engine 1
It is fixed to a mounting plate 12 attached to the forwardly inclined portion of the frame body 9 by a screw fastener or the like.

Reference numeral 13 is a power transmission mechanism for holding a rotary disk 49 having cutting blades 5, 5 rotatably in front of the wheels 3, 3 and for transmitting a rotational force from the engine 1 to the rotary disk 49. is there. The power transmission mechanism 13 includes a clutch case 14 attached to the front side of the mounting plate 12, a cylindrical holding rod having a base end 15b connected to the clutch case 14 and a tip 15a protruding forward and downward. 15, a gear case 16 provided at the tip 15a of the holding rod 15, and a mounting board 45 provided at the lower end of the gear case 16, and the engine 1 and the gear case 16 are provided.
And a drive shaft rotatably provided inside the holding rod 15 for connecting the first gear inside thereof, a rotary shaft for connecting the second gear meshing with the first gear and the rotary disk 49, and the like. .

As shown in FIGS. 1 to 3, the left and right wheels 3,
3 is formed in a barrel shape having a width L of 200 mm and a diameter φ of 200 mm, for example. More specifically, the wheel 3 has a wheel 17 and a tire 18 fitted on the wheel 17.
The wheel 17 has a central boss portion 20, an outer peripheral wall portion 21, a plurality of radial ribs 22 ... Which are provided at equal intervals in the circumferential direction and which connect the boss portion 20 and the outer peripheral wall portion 21, Each radial rib 22 ...
The tire 18 is barrel-fitted on the outer edge of the mountain shape. In addition, in the wheel 17, the boss portion 20 is in a state of being pulled in closer to the center in the axial direction than the left and right side surfaces.

By thus forming the wheel 3 into a barrel shape having a large width L, as shown in FIG. 3A, even if the ground G has many irregularities such as depressions, protrusions, gravel, etc.
Fits into the depression and the brush cutter tilts left and right
It can be run smoothly with a light hand pushing force.

Further, as shown in FIGS. 4A and 4B,
The left and right wheels 3, 3 are mounted on the axle 10 so that the vehicle width W can be adjusted. Specifically, the mounting structure of the wheel 3 on the axle 10 will be described. As shown in FIG. 3A, a pipe body 19 (shorter than the axle 10) is provided in the horizontal direction at the lower end of the center frame 6 of the frame 2. The axle 10 is inserted into the pipe body 19 with both left and right ends protruding. Then, on the end side of the axle 10, the boss portion 20 of the wheel 17 is
The wheel 3 is mounted by fitting the wheel 3 onto the axle 10
A cylindrical spacer 24 is fitted between the pipe body 19 and the pipe body 19,
By attaching a retaining member 25 (for example, a split pin) to the end of 10, the vehicle width W of the left and right wheels 3 and 3 can be set to a large value as shown in FIG. Even on the ground G with a lot of rattling, the brush cutter can be stably run. At this time, since the wheels 3 and 3 are barrel-shaped, the stability becomes synergistically excellent.

Further, the retaining member 25 is pulled out from the state of FIG. 3 (a), the wheel 3 and the spacer 24 are removed from the axle 10, and the wheel 3 is first attached to the axle 10 as shown in FIG. 3 (b). , Install a spacer 24 on the end of the axle 10
As shown in Fig. 4 (b), the vehicle width W is reduced by using the lock to prevent the ground (road surface) with a narrow width such as a ridge.
Even G can run.

Further, as shown in FIG. 5, by increasing the vehicle width W, in the work on the sloping ground (slope) G,
You can operate and run the brush cutter stably without falling.

As shown in FIGS. 1 and 2, the handle 4 is
It has a front-rear direction portion 27 on the side of the base end 26b, a vertical direction portion 28 with the tip 26a side facing up and down, and an intermediate curved portion 29 connecting the front-back direction portion 27 and the vertical direction portion 28. . The base end 26b of the handle 4 (the end of the front-rear direction portion 27) is attached to the upper end 23a of the frame 2 via the angle adjusting mechanism 11.

As shown in FIGS. 2 and 6, the angle adjusting mechanism 11
Is a first member 31 having an annular first meshing tooth 30 fixed to the upper end 23a of the frame 2 and directed to the left and right sides.
And a second member having an annular second meshing tooth 32 fixed to the base end 26b of the handle 4 and meshing with the first meshing tooth 30.
A bolt portion 34 and a nut portion which connect the first and second members 31 and 33 with the 33 and the first and second meshing teeth 30 and 33 engaged with each other.
35 and. Reference numeral 36 denotes a male screw of the bolt portion 34 which is inserted into the holes of the first and second meshing teeth 30 and 32.

As described above, since the angle adjusting mechanism 11 is provided at the joint between the base end 26b of the handle 4 and the upper end 23a of the frame 2, the nut portion 35 of the angle adjusting mechanism 11 is loosened,
When the second member 33 is separated from the first member 31 and the meshing state of the first and second meshing teeth 30, 32 is released, the handle 4 becomes free as shown by the phantom line in FIG. The front-rear direction portion 27 on the side of 26b can be vertically swung, and the nut portion 35 can be tightened and fixed at a desired vertical inclination angle. That is, by adjusting the vertical inclination angle of the front-rear direction portion 27, the vertical direction portion 28 on the tip end 26a side can be adjusted to a desired vertical height.

Therefore, it is possible to adapt to the height of the worker who uses the brush cutter, and the mowing work under a low tree such as an orchard becomes easy. Further, as shown in FIG. 2, since the tip 26a side for gripping the handle 4 is vertically oriented vertically, the handle 4 can be easily shaken left and right with one hand (as indicated by an arrow A), and the cutting blade together with the turntable 49 can be used. Wide cutting by swinging 5, 5 to the left and right becomes easy. In addition, handle 4
When the tip 26a is attached to the ground G, it serves as a leg for raising and placing the cutting blade 5.

Further, in the brush cutter of the present invention, as shown in FIGS. 1, 2 and 7, the power transmission mechanism 13 is provided with a retractable blade height adjuster 38 having a sliding contact plate 37 which is in sliding contact with the ground G. A cutting blade height H can be adjusted by a blade height adjusting tool 38 attached to the holding rod 15. More specifically, the blade height adjuster 38 includes a cylindrical short tubular portion 39 fitted on the holding rod 15, an outer tubular portion 40 continuously connected to the short tubular portion 39 so as to project downward, and an outer barrel. A bowl-shaped sliding contact plate 37 integrally having a shaft portion 41 slidably inserted into a lower end opening of the portion 40 and a nut portion 44 screwed to a male screw 41a at the lower end of the shaft portion 41, Is equipped with. Further, in the blade height adjuster 38, a set screw 42 is screwed into a screw hole provided at the lower end of the outer tubular portion 40 to fix the shaft portion 41 to the outer tubular portion 40, and to the short tubular portion 39. Set screw 51 in the provided screw hole
And the blade height adjuster 38 is fixed to the holding rod 15 (Fig. 8).
reference). In addition, the sliding contact surface (lower surface) of the sliding contact plate 37 with the ground G is formed in an upwardly curved shape from the center toward the outer circumference,
It is prevented from being caught by the unevenness of the. Note that 43
Is a hole in the sliding contact plate 37.

According to this blade height adjuster 38, the shaft portion 41
By adjusting the amount of protrusion from the outer cylinder portion 40 with the setscrew 42, the height H of the turntable 49 having the cutting blades 5, 5 from the ground G can be adjusted. That is, the left and right wheels 3,
It is possible to maintain the desired cutting blade height H in a state in which the three and the sliding contact plate 37 are supported by three points, and it is possible to cut grass to a uniform height as in the case of lawn cutting.

Further, as shown in FIGS. 8 and 9, in this brush cutter, the cutting blades 5, 5 are attached to the tip 15a of the holding rod 15 so as to swing around the holding rod 15, and the cutting blade angle θ is set. It is adjustable. That is, in the power transmission mechanism 13, the gear case
The cylindrical short tube portion 46 integrally provided on the 16 is attached to the tip of the holding rod 15.
The short cylinder portion 46 is fixed to the holding rod 15 by externally fitting to the 15a, and a set screw 47 is screwed into a screw hole provided in the short cylinder portion 46.
Therefore, if the set screw 47 is loosened, the short cylinder part 46 and the gear case
The unit body 50 including the 16 and the mounting plate 45 and the rotary plate 49 having the cutting blades 5 and 5 can be swung around the holding rod 15 (as indicated by the arrow B) and stopped at the desired cutting blade angle θ. Tighten the screw 47. At this time, as shown in FIGS. 1, 2, and 8, a grass clippings prevention plate 48 is attached to the rear end of the mounting board 45, and the blade height adjustment tool 38 is attached to the grass clippings prevention plate 48.
When the shaft portion 41 of the blade penetrates, the blade height adjuster 38 also loosens its set screw 51 and rotates in the same direction (as indicated by arrow C).

Since the cutting blade angle θ can be adjusted in this manner, as shown in FIG. 9, for example, the cutting blade angle θ
If you adjust the angle to near 90 °, the ground (road surface) such as ridges and banks
It is also possible to easily mow when G.

10 and 11 show a second embodiment. This hand-operated brush cutter is a blade height adjustment tool (of different structure)
38 ', and the blade height adjuster 38' is attached to the holding rod 15. The cutting blade height H can be adjusted by the blade height adjuster 38 '.

The blade height adjuster 38 'is a sphere rolling on the ground G.
A large number of small spheres 101 having 100 and holding the sphere 100 rotatably, and a small space S between the spherical upper half of the sphere 100 to form a large number of small spheres 101. A hemispherical shell-shaped receiving member 102 held at S is provided. The sphere 100 is made of, for example, a hollow shell-shaped plastic. In addition, the hemispherical shell-shaped receiving member 102
Has a horizontal collar portion 102b at the lower end.

Reference numeral 103 denotes a retaining ring that holds the sphere 100 in place and prevents the small sphere 101 from coming off the gap S. The retaining ring 103 is continuously connected to the downward retaining portion 104 and the upper end of the retaining portion 104, and is attached to the horizontal flange portion 102b of the hemispherical shell receiving member 102 by a bolt 105 and a nut 106. Horizontal collar part to be fixed
It consists of 107 and.

The hemispherical shell-shaped receiving member 102 is integrally molded with the screw member 108, and at the top portion 102a of the hemispherical shell-shaped receiving member 102,
The hemispherical shell-shaped receiving member 102 and the lower end of the screw member 108 are connected to each other. The screw member 108 is screwed into a screw hole 109 formed in the inner surface of the outer tubular portion 40. The screw member 108 is prevented from loosening at the lower end portion of the outer tubular portion 40 by the lock nut 110. The material of the blade height adjuster 38 'is plastic except for the outer cylinder portion 40, the screw member 108, the bolt 105 and the nut 106 in order to prevent rust and to reduce weight and friction resistance. It is desirable in terms of reduction.

According to the brush cutter of the present invention having such a structure, the wheels 3 and 3 are formed in a barrel shape and the vehicle width W is adjustable, so that the ground G or the slope having a lot of unevenness can be used. Running ability
The stability is increased, it is possible to run on narrow roads such as a ridge, and the tip 26a side of the handle 4 can be adjusted vertically and vertically, and the height can be adjusted. Easy to operate without Further, since the cutting height H can be adjusted by providing the blade height adjusting tool 38 or the blade height adjusting tool 38 ', it is possible to easily carry out plane cutting, and adjust the left and right wheels 3, 3 and the blade height. 3 by tool 38 (blade height adjuster 38 ')
It is possible to perform work with point support, and it is not necessary for the operator to balance the cutting blades 5 and 5 with the handle 4 so that the cutting blades 5 and 5 float above the ground G. Further, since the cutting blade angle θ can be adjusted, it is also possible to easily perform the near cutting. Therefore, since the conventional machine was difficult and dangerous to operate and work, only an adult expert could handle it, but with the brush cutter of the present invention, even unfamiliar women and children can safely and easily operate the grass cutting work. It can be performed.

[0035]

Since the present invention is configured as described above, it has the following effects.

By making the wheel 3 a barrel shape having a large width L (according to claim 1), even if the ground G has many irregularities such as depressions, protrusions, gravel, etc. The bush cutter can be smoothly moved with a light hand push force without being slid into the bush and tilting to the left or right.

By increasing the vehicle width W of the left and right wheels 3 and 3 (according to claim 2), the lawn mower can be stably driven even on the ground G having many irregularities such as depressions, protrusions, and gravel. In addition, the brush cutter can be stably operated and run without tilting even when working on the inclined ground G. Further, by reducing the vehicle width W, it becomes possible to travel even on a narrow ground G such as a ridge.

Since the tip 26a side for gripping the handle 4 is vertically oriented (according to claim 3), the handle 4 can be easily swung left and right with one hand, and the cutting blades 5, 5 are swung left and right. Wide cutting becomes easy. In addition, handle 4
If the tip 26a is attached to the ground G, it can also be used as a leg when raising the cutting blades 5 and 5.

(According to claim 4) Since the vertical height on the side of the tip 26a for gripping the handle 4 can be adjusted, it is possible to adapt to the height of the worker who uses the brush cutter and at the same time in the orchard. Mowing work under such a low tree is also easy.

By providing the blade height adjuster 38 (according to claim 5), the cutting blades 5 and 5 can be set to desired cutting blades by supporting the left and right wheels 3 and 3 and the sliding contact plate 37 at three points. It can be maintained at the height H, and the grass can be trimmed to a uniform height like the lawn mowing.

Since the cutting blade angle θ can be adjusted (according to claim 6), if the cutting blade angle θ is adjusted to near 90 °, for example, mowing on a ridge or a bank can be performed easily. it can.

(According to claim 7) The resistance of the ground G is small, and the ground G can be run lightly. Also, the direction can be changed lightly and quickly.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the walk-behind brush cutter when viewed obliquely from behind.

FIG. 3 is a cross-sectional view of an essential part showing a mounting structure of a wheel on an axle when changing a vehicle width.

FIG. 4 is an explanatory diagram for explaining operational effects when the vehicle width is large and when the vehicle width is small.

FIG. 5 is an explanatory diagram showing a grounded state of a wheel on an inclined ground.

FIG. 6 is a plan view of an essential part showing an angle adjusting mechanism.

FIG. 7 is a cross-sectional view of essential parts showing a blade height adjuster.

FIG. 8 is a plan view of relevant parts showing a state in which the bush cutter is attached to the holding rod so that the bush can be swung.

FIG. 9 is an explanatory diagram showing a mowing state when the mowing blade angle is 90 °.

FIG. 10 is a side view showing a second embodiment of the present invention.

FIG. 11 is a cross-sectional view of essential parts showing a blade height adjuster.

[Explanation of symbols]

1 engine 2 frames Three wheels 4 handles 5 cutting blade 10 axles 11 Angle adjustment mechanism 15 Holding rod 15a tip 23a upper end 23b bottom 26a tip 26b base 37 Sliding board 38 Blade height adjuster 38 ′ blade height adjuster 100 spheres 101 small balls 102 hemispherical shell receiving member G ground H cutting blade height W car width θ Cutting blade angle

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) A01D 34/74 A01D 34/74

Claims (7)

[Claims] 1. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided at a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
In a hand-operated brush cutter provided with a pair of left and right wheels 3 and 3 in front of which are rotated by the engine 1, the wheels 3 and 3 are formed into a barrel shape. A hand-operated brush cutter characterized by doing the above. 2. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided at a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
And a pair of left and right wheels 3, 3 provided in front of the pair of left and right wheels 3, 3, and a cutting blade 5 rotated by the engine 1. A hand-operated brush cutter that is mounted on the vehicle so that the vehicle width W can be adjusted. 3. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided at a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
And a cutting blade 5 which is provided in front of the pair of left and right wheels 3 and 3 and which is rotated by the engine 1, in a manual brush cutter, the tip 26a side of the handle 4 is vertically moved vertically. Hand-operated brush cutter characterized by being oriented. 4. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided at a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
And a cutting blade 5 which is provided in front of the pair of left and right wheels 3 and 3 and which is rotated by the engine 1, in a hand-operated brush cutter, the base end 26b of the handle 4 and the frame 2 are provided. An angle adjusting mechanism 11 is provided at a connecting portion with an upper end 23a of the handle, and the vertical adjusting angle on the base end 26b side of the handle 4 can be adjusted by the angle adjusting mechanism 11 to adjust the vertical height on the tip end 26a side. A hand-operated brush cutter that is characterized by 5. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided at a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
And a holding rod projecting downward from the engine 1
Cutting blade 5 provided at the tip of 15 and rotated by engine 1
And a retractable blade height adjuster 38 having a sliding contact plate 37 that is in sliding contact with the ground G.
A hand-operated brush cutter, which is attached to the blade 15, and is capable of adjusting the cutting blade height H with the blade height adjuster 38. 6. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided on a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
And a holding rod projecting downward from the engine 1
A hand-operated brush cutter equipped with a cutting blade 5 which is provided at the tip 15a of 15 and rotates by the engine 1, and which can swing the cutting blade 5 around the holding rod 15 to the tip 15a. A hand-operated brush cutter, which is attached so that the cutting blade angle θ can be adjusted. 7. A frame 2 for holding an engine 1, and a pair of left and right wheels 3, 3 provided at a lower end 23b of the frame 2.
3 and a handle 4 provided on the upper end 23a of the frame 2
And a holding rod projecting downward from the engine 1
Cutting blade 5 provided at the tip of 15 and rotated by engine 1
And a small number of small balls 101 having a sphere 100 rolling on the ground G and holding the sphere 100 rotatably, and the sphere 100 described above. A blade height adjusting tool provided with a hemispherical shell-shaped receiving member 102 for forming a gap S between the spherical upper half portion and the large number of small balls 101 ...
A hand-operated brush cutter, wherein 38 'is attached to the holding rod 15, and the cutting blade height H can be adjusted by the blade height adjusting tool 38'.