JPS5853938Y2 - portable power brush cutter - Google Patents

Description

[Detailed description of the invention] This invention consists of attaching a cutting blade to the tip of the handle rod, and installing the engine directly at the rear end of the handle rod, and transmitting the driving force of the engine to the drive shaft inserted inside the handle rod. This invention relates to an improvement to a portable power brush cutter that cuts away grains, weeds, bushes, etc. by transmitting power to the cutting blade through the power and rotating the cutting blade.

The brush cutter of this invention supports the main body of the brush cutter at three points: the left and right hands of the operator and one of the forearms.
BACKGROUND ART Prior to the filing of this application, a brush cutter configured to support the brush cutter body using the forearm of the operator was known.

(Refer to Utility Model Application Publication No. 134226/1983). As shown in Fig. 4, this brush cutter has an arm support member added to the rear upper surface of the handle rod a, and this member is formed to restrain the circumference of the worker's forearm C, and the upper part is provided in front of the arm support member. Although it is constructed with a protruding grip d facing toward the user, it has the following drawbacks.

That is, the first drawback is that the handle a is suspended below and parallel to one of the worker's hands, generally the right forearm C. Even if an attempt is made to cut the workpiece e, the acting force F is not effectively transmitted to the cutting blade f, making it impossible to proceed with the work efficiently.

That is, referring to Fig. 4, the acting force F and the cutting resistance force G form a couple, and the acting force F is mainly used to rotate the brush cutter body in the M direction. It is.

A second drawback is that when working on a slope, it is extremely difficult to maintain the state in which the cutting blade f is rotated by a predetermined angle around the axis of the handle rod a for a long period of time.

This is because, as shown in Fig. 5, the moment M around the right forearm caused by the weight of the brush cutter is large, and a very large force is required to counter this, and the moment M around the right forearm is large.
This is because they have to continue working in an unnatural posture with their hands raised.

The third drawback is that when working on uneven ground, it is difficult to quickly change the angle of the cutting blade f to follow the unevenness of the uneven ground.

This is because the arm support member that restrains the right forearm C of one worker is in an inappropriate position for the angle changing work.

The fourth drawback is that because the worker's right forearm C is inserted through the arm support member, it is difficult to immediately remove the right forearm C from the arm support member in the event of an engine fire, etc., which is a safety issue. There is a problem.

The present invention aims to correct the various drawbacks of the above-mentioned conventional examples all at once.

The present invention will be specifically described below based on embodiments shown in the drawings.

Reference numeral 1 denotes a handle rod, at the tip of which a cutting blade 2 such as a rotary blade or a blade chain is attached, and at the same time an engine 3 is directly attached to the rear end.

4 is a forearm base supporter that restrains the upper surface and left and right side surfaces of the forearm base A of the worker, with the lower part released, and 4 is a forearm base supporter that restrains the upper surface and left and right side surfaces of the forearm base A of the operator, and is placed near the center of gravity of the brush cutter main body or in a position in front of it, on the rear right side of the handle rod 1; It is located on the right side of the worker.

As shown in FIG. 2, this forearm base support 4 is preferably formed into an inverted U-shape, and a buffer member 8 is preferably attached to the inner peripheral surface thereof.

Further, it is preferable that the forearm base support 4 is attached to the handle rod 1 via the holding fitting 5 so that its position can be adjusted in the axial direction.

Reference numerals 6 and 7 denote a pair of grips protruding left and right provided at the front position of the forearm base support 4. The tool 7 is buttoned in front of the right grip tool 6 so as to protrude leftward from the handle rod 1.
Each handle is added to 1 rod.

By supporting the forearm base support tool 4 and the right grip tool 6 with the right hand and supporting the left grip tool 7 with the left hand, the worker can:
Brush cutting work can be performed with the brush cutter main body supported at three points.

At this time, most of the weight of the brush cutter body is, for example, a moment in the direction M in FIG. 4 with the left grip 7 as the fulcrum.
The support is stopped on the upper surface of the worker's forearm wound A via the forearm base support 4.

Next, the effects of the present invention will be explained.

In the portable power brush cutter according to the present invention, the right forearm C of the worker is parallel to the right side of the handle rod 1 (in front of the worker supporting the brush cutter, that is, the right side when facing the cutting blade 2). , and maintains an integral relationship with the handle rod 1.

Moreover, since the right and left sides of the base A of the worker's right forearm C are restrained by the forearm base support 4, when the right forearm C is moved left and right and the handle 1 is swung left and right, the acting force is It is effectively transmitted to the cutting blade 2, and the workpiece e can be cut efficiently.

As is clear from FIG. 1, the brush cutter of the present invention is operated by swinging the handle 1 from side to side around the forearm base support 4, that is, the upper arm of one worker.

Since the center of gravity of the monthly payment type of the present invention is located near the forearm base support 4 or slightly behind this, the position of the center of gravity does not fluctuate when swinging the handle rod 1 as described above. As a result, the left and right swinging operation of the handle rod 1 described above can be performed very easily.

The conventional example had the disadvantage that the brush cutter body rotated in the direction M in FIG.
7 so as to protrude from the handle rod 1 in a substantially horizontal direction, the brush cutter body can be positioned at three points on the substantially horizontal plane of the forearm base support 4 and the left and right grips 6 and 7. The structure is such that the force for swinging the handle rod 1 can be applied almost along the axis of the handle rod 1, so that the drawbacks of the above-mentioned conventional example can be corrected. Can be done.

Furthermore, even if a couple of forces are generated that try to rotate the handle rod 1 in the direction M, the left and right grips 6. By adjusting the force for grasping γ, it is possible to effectively prevent the handle rod 1 from rotating on its axis.

Additionally, in the present invention, the forearm base support 4 is attached to the right side of the handle rod 1 near or in front of the center of gravity of the brush cutter body.

As a result, the following unique effects can be expected.

That is, since the forearm base support 4 is attached near the center of gravity of the brush cutter body or in front of it, the force applied to the left and right grips 6 and 7 is not considered, but the handle rod 1 tries to float upward using the forearm base support 4 as a fulcrum.

However, if we focus on the arm of a power worker, the base of the forearm is located slightly forward of the elbow joint. There is a force that tries to rotate it.

Therefore, the tendency of the handle rod 1 to rise upward as described above is offset by the force of the worker's forearm attempting to rotate downward, and as a result, the worker applies a force to his arm. At the very least, you can balance the brush cutter almost horizontally.

For this reason, in the working state, almost no arm strength is required for the purpose of supporting the weight of the brush cutter, and almost all of that arm strength is used to swing the handle rod 1 from side to side or up and down. This allows the user to focus solely on operations, which greatly improves operability.

In particular, it becomes easier to trim upper branches, etc., which was nearly impossible in the conventional case.

Further, according to the present invention, work on a slope can be carried out easily and with less fatigue.

That is, as shown in FIG. 3, by slightly lifting the forearm base support 4 located in the lateral direction of the handle rod 1, the cutting blade 2 can be maintained in a state rotated by a predetermined angle around the axis of the handle rod 1. The moment N generated when the right forearm rotates around zero can be reliably received and stopped on the upper surface of the right forearm base A, and the work can be continued.

As a result, workers have to raise their right shoulder slightly while working, but this posture is not unnatural, so there is little fatigue during work.

Further, according to the present invention, when working on uneven ground, the angle of the cutting blade 2 can be quickly changed to follow the unevenness of the uneven ground, and the work can be carried out.

This is because the right forearm base A is located on the lateral side of the handle rod 1, so it is possible to change the cutting blade 2 to a desired angle by slight vertical movement of the right forearm base A.

In addition to the above-mentioned effects, the present invention is advantageous in terms of safety because the right forearm C can be immediately removed from below the forearm base support 4 in the event of an engine fire or the like.

In this way, the portable power brush cutter of the present invention allows for efficient and accurate swinging of the brush cutter body from side to side, and allows for smooth work on slopes and uneven ground.
It has the advantage of being advantageous in terms of safety.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a perspective view of the main part, and FIG. 3 is a perspective view of the present invention.
FIGS. 4 and 5 are perspective views showing the state of use of the conventional example. 1...handle, 2...cutting blade, 3...
··engine. 4...Forearm base support, 6... Right grip,
7...Azumi Hidanami.

Claims (1)

[Scope of utility model registration request] In a portable power monthly payment machine that has a cutting blade attached to the tip of the handle and an engine mounted directly to the rear end of the handle,
The upper surface and left and right sides of the worker's forearm base are restrained, and the forearm base support device, which is released downward, is placed on the right side of the handle (on the right hand side of the worker) at a location near or in front of the center of gravity of the brush cutter body. ), a right hand grip is provided which protrudes almost horizontally to the right side from the handle at the front position of the forearm base support, and a right hand grip is provided in front of the right hand grip and extends almost horizontally from the handle to the left from the handle. A left grip protruding from the forearm base support, a right grip, and A portable power brush cutter characterized by having three members arranged in the left grip A.