JP2003259713A - Portable power grass cutter and method of using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power source-integrated portable grass cutter having improved operability. <P>SOLUTION: The portable power grass cutter includes an operative pipe 10, a rotary blade 31 supported on the tip of the pipe 10, and a power source 20 integratedly connected to the basal end of the pipe 10. This grass cutter operates so as to rotate the blade 31 by the rotating output from the power source 20. This grass cutter also includes a 1st band connective part 13 set at an appropriate point of the pipe 10 and a 2nd band connective part 16 set on the power source 20 or behind it. The 1st end 41 and 2nd end 42 of a shoulder band 40 are connected to the 1st band connective part 13 and 2nd band connective part 16, respectively. Preferably, an elastic stretch part 44 is provided at an appropriate point of the shoulder band 40. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable power brush cutter used for cutting grasses such as weeds growing on the surface of the ground from the vicinity of their roots. The present invention relates to a portable power brush cutter of a type in which a small engine as a power source is directly connected to a section.

[0002]

2. Description of the Related Art As shown in FIG. 3, a portable power brush cutter 1 of this type is provided with a rotary blade 31 at the tip of an operation tube 10,
The rotation output of the power source 20 is transmitted to the rotary blade 31 via a transmission shaft that is inserted in the operation tube 10, and is rotated. As the power source, for example, a small gasoline engine is adopted, and is directly connected to the base end portion of the operation pipe 10. The operation tube 10 is usually equipped with a grip handle 7 for swinging the operation tube 10.

[0003] And, such a portable power brush cutter 1
As shown in the figure, an annular shoulder strap 40 is connected at an appropriate portion of the operation tube 10, preferably at a position that is the center of gravity of the entire brush cutter, and the weight thereof is set to the shoulder strap 40 described above. It is configured to perform the brush cutting work while being supported by the operator's body via the above. More specifically, FIG.
As shown in FIG. 5, the operation tube 10 is located under the right armpit of the worker, and the shoulder strap 40 is hung around the left shoulder of the worker in a so-called draping manner.

The operation tube 10 can freely swing up, down, left and right with a connection portion with the shoulder strap 40 as a fulcrum. Therefore, the operator can move the operation tube 10 in the vertical or horizontal direction via the grip handle 7 to guide the rotary blade 31 at the tip of the operation tube 10 to the target position to be mowed, while cutting. You can pay.

[0005]

By the way, in the case of mowing bushes on a flat ground, the operator moves forward, for example, while swinging the operation pipe 10 in the left-right direction as described above. To cut the plants at a certain height from
It is required to improve the quality of the brush cutting work. in this case,
Operation tube 1 for keeping the height of the rotary blade 31 from the surface constant
Although 0 must be swung, this work is relatively difficult. This is because, as described above, since the operation tube 10 can freely swing up and down with the connection portion with the shoulder strap 40 as a fulcrum, the up and down posture of the operation tube 10 can be maintained only by the arm force of the operator. Because it depends on. For this reason, in the conventional portable power brush cutter having the above-described configuration, it was difficult to hold the rotary blade 31 at a certain height above the surface of the earth and to move the rotary blade 31 as intended.

When the operation pipe 10 is swung in the left-right direction, the rotational moments in the left-right direction are alternately alternated against the inertia of the operation pipe 10 and the rotary blades 31 attached to the front and rear ends thereof and the small engine 20. It is to give to. In this case, in the conventional portable power brush cutter having the above structure, the operation pipe 1
A phenomenon occurs in which 0 repeatedly collides with the waist of the worker. That is, when the operating tube 10 is swung leftward and the direction is swung rightward, the operating tube 10 collides with the right waist of the worker. On the contrary, when the operating tube 10 is swung leftward by changing its direction from the state of being swung rightward, the operating tube 10 behaves as if it is separated from the right waist of the operator.

When the swinging operation as described above is repeated, the waist of the worker may be damaged, and when viewed from the side of the operation tube, an external force is applied from the waist of the worker. As a result, as described above, even when the operation tube is swung while maintaining the height of the rotary blade 31 above the ground constant, the operability is also affected and the ground surface height of the rotary blade is reduced. It becomes more and more difficult to carry out stable brush cutting work while maintaining a constant level.

The present invention was conceived under the above circumstances, and its object is to further improve the operability of a portable power brush cutter with an engine.

[0009]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention adopts the following technical means.

That is, in the portable power brush cutter provided by the first aspect of the present invention, the operation tube, the rotary blade supported on the distal end portion of the operation tube, and the base end portion of the operation tube are integrated. A portable power brush cutter configured to rotate the rotary blade by a rotation output of the power source, the power brush being provided in an appropriate portion in the extension direction of the operation pipe. And a second band connecting portion provided on the power source or a rear portion thereof.

In a preferred embodiment, a grip handle is attached to an appropriate portion of the operation tube, and the first band is provided at an appropriate portion of the operation tube between the grip handle and the power source. A connection is provided.

The preferred embodiment also includes a shoulder strap, the shoulder strap having a first end connected to the first band connection and the second strap.
A second end connected to the band connecting portion and a shoulder portion provided between the first end and the second end are provided.

In a preferred embodiment, the shoulder strap has an elastic stretchable portion between the shoulder strap and the second end.

A method of using the portable power brush cutter provided by the second aspect of the present invention is the method of using the portable power brush cutter according to the first aspect, wherein the operation tube extends forward. It is characterized in that the above-mentioned shoulder strap is hung on the shoulder in a rugged manner.

The portable power brush cutter according to the present invention does not support one point of the operation tube on the shoulder strap as in the conventional case, but includes two points in the entire length up to the power source including the operation tube.
They are supported by shoulder straps at points. for that reason,
In the use state, the degree of freedom of vertical swing of the operation tube is limited to some extent. However, on the other hand, the vertical posture of the operating tube can be stabilized, and the work of swinging the operating tube while keeping the ground height of the rotary blade constant becomes extremely easy.

Further, between the shoulder portion of the shoulder strap and the second end portion, the rear portion of the operating tube is pulled toward the body of the operator when the operating tube is swung leftward. Therefore, even if the operating tube is swung to the left abruptly, the operating tube is less likely to be carelessly separated from the right waist of the operator. As a result, it is less likely that the operating tube once separated from the body will collide with the waist of the worker even when the direction is changed from the left swing to the right swing.

From the above, the operability of the portable power brush cutter according to the present invention is remarkably improved as compared with the conventional one.

Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 shows an overall structure of a portable power brush cutter 1 according to an embodiment of the present invention in a state where an operator supports it, and FIG. 2 shows a main part of the brush cutter 1 shown in FIG. It shows concretely. The brush cutter 1 includes an operation pipe 10 and the operation pipe 10.
Small engine 20 as a power source connected to the base end of a vehicle
And a rotary blade 31 supported on the tip of the operation tube 10, the rotation output of the small engine 20 is generated by a transmission shaft (not shown) inserted through the inside of the operation tube 10. It is adapted to be transmitted to the rotary blade 31 via.

The operation pipe 10 is formed of a lightweight metal pipe such as aluminum, and a clutch housing 11 is integrally attached to the base end portion thereof. The clutch housing 11 is connected to the main body of the engine 20,
As a result, the base end portion of the operation pipe 10 is connected to the engine 20. A clutch drum (not shown) is rotatably supported inside the clutch housing 11, and the base end of the transmission shaft is connected to the clutch drum. The clutch drum forms a centrifugal clutch in cooperation with a clutch shoe (not shown) on the engine side. When the rotational speed of the engine 20 is increased by operating a throttle lever (not shown), the centrifugal clutch will not move.
Is transmitted to the clutch drum and the transmission shaft is rotated, whereby the rotary blade 31 at the tip of the operation tube 10 is rotated.

A rotary blade support member 30 is provided at the tip of the operation tube 10. A bevel gear mechanism is incorporated in the rotary blade support member 30, and the rotary blade support shaft is supported at an angle to the axial direction of the operation tube 10. As the rotary blade 31 attached to the rotary blade support shaft, for example, one having a saw blade directly formed on the outer periphery of a metal disk, or one having a super steel chip blade attached is preferably used.

A grip handle 7 curved in a U-shape is provided at a portion of the operation pipe 10 which is located a predetermined distance ahead of the engine 20. A first band connecting portion 13 is provided at an appropriate portion of the operation tube 10 between the grip handle 7 and the engine 20. This first
As shown in FIG. 2, the band connecting portion 13 can be configured by attaching the ear piece 14 having the hole 14a to the operation tube 10 via, for example, a band member. The position where the first band connecting portion 13 is provided is preferably selected in the vicinity of the center of gravity of the brush cutter main body including the operation tube 10, the rotary blade 31 and the engine 20, but is located in front of the vicinity of the center of gravity. May be.

Further, in the present invention, the engine 20
Alternatively, the second band connecting portion 16 is provided at the rear portion thereof. In this embodiment, the second band connecting portion 16 is provided at an appropriate portion of the component parts of the engine 20 so as to extend rearward. The second band connecting portion 16 can also be configured by the ear piece 17 having the hole 17a as well shown in FIG.

The first band connecting portion 13 and the second band connecting portion 16 are provided with connecting members 41a and 42a provided at the first end portion 41 and the second end portion 42 of the shoulder strap 40, respectively.
Connection is made through the holes 14a and 17a formed in the ear pieces 14 and 17, respectively. A shoulder pad 43 is provided at an appropriate portion of the middle portion of the shoulder strap 40 that contacts the shoulder of the operator, and the shoulder pad 43 and the second end portion 42 are provided.
An elastic expansion / contraction portion 44 is provided between and. As the elastic expansion / contraction part 44, a relatively strong rubber band may be provided, or a tension coil spring or the like may be interposed.

A portable power brush cutter 1 having the above structure
As shown in FIG. 1, the shoulder strap 40 is hung on the shoulder of the worker and is supported by the body of the worker. That is, for a right-handed worker, the operation tube 10 is positioned on the lower right side and the shoulder strap 40 is hung so that the shoulder pad 43 contacts the left shoulder.

As a result, the brush cutter 1 is supported by the body of the operator via the shoulder strap 40 at the two points of the first band connecting portion 13 and the second band connecting portion 16. As described above, since the first band connecting portion 13 is provided in the vicinity of the center of gravity of the entire brush cutter, it is basically the first band connecting portion 13.
The operation tube 10 can swing vertically and horizontally with the vicinity of the band connecting portion 13 as a fulcrum.

In this case, the vertical swing of the operation tube 10 causes the shoulder pad 40 of the shoulder strap 40 to move.
The elastic stretchable portion 44 between the second end portion 42 and the second end portion 42 is allowed to stretch. The elastic expansion / contraction part 44 is
It seems that the operation of holding the grip handle 7 and moving the operation tube 10 in the vertical direction is restricted.
It is rather convenient when the operation tube 10 is swung in the left-right direction while maintaining the ground surface height of the rotary blade 31 constant. Also,
When performing the mowing work on the sloped ground with the tip of the toe lowered or the tip of the toe raised, it is necessary to change the inclination angle of the operation pipe 10 as compared with the case of performing the mowing work on the flat surface.
Even in such a case, by expanding and contracting the elastic expansion / contraction portion 44, the operation tube 10 can easily take a desired tilted posture, and furthermore, the operation tube 10 is shaken while the posture is stabilized. It can be operated twice. Further, since the change of the inclination angle of the operation tube 10 as described above is dealt with by expanding and contracting the elastic expansion / contraction part 44,
The problem that the shoulder pad 43 shifts on the shoulder of the worker does not occur.

Next, the second end 42 of the shoulder strap 40.
Is connected to the rear of the engine 20 on the right side of the worker and behind the back. Therefore, the shoulder strap 4 extending from the left shoulder of the worker including the elastic stretchable portion 44.
This part of 0 always acts to pull the operation tube 10 around the right waist of the operator. Therefore, even when the operation tube 10 is rapidly swung to the left, the operation tube 10 is less likely to be carelessly separated from the right waist of the operator. Therefore, when the direction is changed from the left swing to the right swing, it is less likely that the operation tube 10 collides strongly with the right waist of the worker.

As described above, according to the portable power brush cutter 1 having the above-described structure, the operation of swinging the operation pipe 10 left and right in order to move the rotary blade 31 along the surface of the earth can be performed more stably. In addition, the problem that the operation tube 10 repeatedly collides with the waist of the worker is suppressed to a minimum, and the operation feeling becomes extremely excellent.

Of course, the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in each claim are included in the scope of the present invention.

For example, the position of the first band connecting portion 13 to be provided at an appropriate portion along the extension direction of the operation tube 10 is important because the position in the extension direction of the operation tube 10 is important.
It is not necessary to directly provide it to the engine, but it may be provided, for example, via a stay or the like extending forward from the engine or the clutch housing.

Further, in the embodiment, the elastic stretchable portion 44 is provided between the shoulder pad 43 and the second end portion 42 of the shoulder strap 40. However, whether or not the elastic stretchable portion is provided is a matter of choice. Is. Further, such elastic stretchable portion 44 may be provided between the shoulder pad 43 and the first end portion 41.

The material and type of the shoulder strap 40 are not limited. Of course, it is also possible if the structure is adjustable. As the shoulder-hanging portion, a shoulder-hanging pad 43 may be provided, and the shoulder-hanging portion may be wide or only a friction member may be attached.

Further, there is a brush cutter of this type in which the angle of the rotary blade 31 with respect to the operation tube 10 can be adjusted. Of course, the tip of the operation tube 10 can be attached through such an angle adjusting mechanism. The case of supporting the rotary blade 31 is also included in the scope of the present invention.

[Brief description of drawings]

FIG. 1 shows an embodiment of a portable power brush cutter according to the present invention in a state where an operator supports the brush cutter.

FIG. 2 is an enlarged view of a main part of the embodiment shown in FIG.

FIG. 3 shows a conventional form-type power brush cutter in a state of being supported by an operator.

[Explanation of symbols]

1 Portable power brush cutter 7 Grip handle 10 Operation tube 13 1st band connection 16 Second band connection 31 rotary blade 40 shoulder band 41 First end (shoulder strap) 42 Second end (shoulder strap) 43 shoulder pad 44 Elastic expansion / contraction part

Claims (5)

[Claims] 1. An operating pipe, a rotary blade supported at a distal end portion of the operating pipe, and a power source integrally connected to a base end portion of the operating pipe. A portable power brush cutter configured to rotate the rotary blade, wherein the first band connecting portion is provided at an appropriate portion in the extension direction of the operation tube, and is provided at the power source or a rear portion thereof. A portable power brush cutter, comprising: a second band connecting portion. 2. A grip handle is attached to an appropriate portion of the operation tube, and the first band connecting portion is provided to an appropriate portion of the operation tube between the grip handle and the power source. The portable power brush cutter according to claim 1, 3. A shoulder strap further comprising a first end connected to the first band connecting portion and a second end connected to the second band connecting portion. The portable power brush cutter according to claim 1 or 2, further comprising: a shoulder portion provided between the first end portion and the second end portion. 4. The portable power brush cutter according to claim 3, wherein the shoulder strap has an elastic stretchable portion provided between the shoulder strap portion and the second end portion. 5. The method of using the portable power brush cutter according to claim 3 or 4, wherein the operation tube extends forward while the shoulder strap is hung on a shoulder. How to use a portable power brush cutter.