JPH104741A - Bush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush cutter capable of reducing the load of a cutting work, capable of improving the environment of the work and simultaneously high in workability and safety. SOLUTION: This bush cutter is made by inserting a power-transmitting shaft into an operation pipe 1 having a prescribed length, disposing a cutting blade part 2 driven through the shaft on the tip of the operation pipe 1, separating an engine 3 for transmitting a power to the shaft from the operation pipe 1, loading and supporting the engine 3 in a state capable of being carried on the ground so that the center of the engine 3 is placed on the wheel shaft of a pair of right and left ground contact wheels 4 traveling on the ground and having a prescribed outer diameter between the right and left ground contact wheels 4, pivotally supporting a movement-controlling member on the wheel shaft to control the backward movement of the engine 3, connecting the output part of the engine 3 to the base end part of the operation pipe 1 through a flexible member 32, and transmitting and connecting the output part of the engine 3 to the power-transmitting shaft in the operation pipe 1 through the flexible shaft inserted into the flexible member 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush cutter for cutting grass and the like, and more particularly, to a power pipe for transmitting power to a cutting blade portion, which is separated from an operating pipe for performing a bushing operation. The power source is configured to be movable on the ground.

[0002]

2. Description of the Related Art In recent years, various brush cutters have been proposed as equipment for easily cutting grass and the like. These brush cutters are generally provided with a cutting blade having a rotary blade, a reciprocating blade and the like at one end of an operating pipe, and a power source such as an engine for rotating the cutting blade at the other end of the operating pipe. Is provided. Then, the worker performs a required operation by holding a control handle provided on the operation pipe.

[0003] The above-mentioned brush cutter is operated by one worker. Therefore, it is required to reduce the weight of the brush cutter in order to reduce the work load, and to reduce noise and vibration of a drive source such as an engine in order to improve a working environment.

A brush cutter described in Japanese Utility Model Laid-Open Publication No. Sho 62-130422 has been proposed as a proposal for solving the above-mentioned demand. In this brush cutter, as shown in FIG. 4, an engine c is mounted on a truck b having traveling wheels a, and the engine c
And one end of the operation pipe d are connected by a flexible shaft e, so that rotational power is transmitted to a rotary blade f provided at the other end of the operation pipe d. Then, the operator operates the operation pipe d without feeling noise and vibration while performing the relatively heavy engine c on the bogie b on the ground, and performs the mowing operation.

[0005]

In the above-mentioned conventional brush cutter, the engine is simply mounted on a bogie having traveling wheels. Therefore, there is a problem that the balance is poor when moving and traveling on the uneven ground, and in a severe case, the bogie is overturned and the workability is deteriorated. Also, when working on slopes,
Since the bogie is not provided with the brake means, the bogie runs out of control on the slope, which causes a problem of deteriorating work safety.

The present invention has been devised to solve these problems, and an object of the present invention is to provide a brush cutter with high workability and safety while reducing the work load and improving the work environment. Is what you do.

[0007]

According to the present invention, a power transmission shaft is inserted into an operation pipe having a required length, and the tip of the operation pipe is driven through the shaft. A driving source for transmitting power to the shaft with respect to the operation pipe is provided separately from the cutting blade portion, and the power source is located between a pair of right and left grounding wheels having a required outer diameter traveling on the ground. Then, the power source is mounted and supported so that the center of the power source is located on the axle line of the left and right ground wheels so as to be movable on the ground, and the output part of the power source and the base end of the operation pipe are flexibly connected. In addition to the connection by a member, the output portion of the power source and the power transmission shaft in the operation pipe are operatively connected by a flexible shaft inserted into the flexible member.

An operating section for controlling the output of the power source is provided at a base end side of the operating pipe, and the driving of the power source is controlled from the operating pipe side.

Further, a movement restricting member is pivotally supported by the power source mounted and supported between the pair of right and left grounding wheels, and the movement restricting member moves in a direction in which the power source is pulled toward the operation pipe and moves. It does not operate, but is movably supported so as to prevent movement in the opposite retreating direction.

[0010]

In the brush cutter according to the present invention, the power source for driving the cutting blade portion is located between a pair of right and left ground wheels having a required outer diameter traveling on the ground. The unit is mounted and supported so that it is located on the axle line of the left and right ground wheels, and is movable on the ground. Therefore, the operator carries out the mowing work while holding the operating pipe alone, reducing noise and vibration, and pulling the drive source easily as if operating a vacuum cleaner. At this time, the driving source travels on the ground stably without losing the balance.

In the brush cutter according to the second aspect of the present invention, the operating section for controlling the driving of the driving source is provided on the operating pipe of the operator, despite the configuration in which the driving source is separated.
The mowing operation can be performed properly.

Further, in the brush cutter according to the third aspect, since the movement restricting member is pivotally supported by the power source mounted and supported between the pair of right and left ground wheels, particularly in the brush cutter operation on an inclined ground or the like.
The operator travels in the direction in which the operator pulls the drive source, but the movement is prevented by the movement restricting member in the opposite (retreat) direction. Therefore, runaway of the drive source due to the inclination can be prevented.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view of a bush cutter of the present invention. In the figure, reference numeral 1 denotes an operation pipe, which is a hollow pipe made of a relatively lightweight metal such as aluminum. A cutting blade portion 2 having a rotary blade 21 is provided at a distal end portion of the operation pipe 1, and an engine 3 which will be described later in detail through a power transmission shaft inserted into the operation pipe 1 though not shown. It is driven to rotate by receiving the power from. Further, a control handle 11 is provided on the base end side of the operation pipe 1, and the control handle 11 is provided with a throttle lever 5 for controlling the rotation of the engine 3.

In the figure, reference numeral 3 denotes an engine for supplying power to the rotary blade 21. The engine 3 is disposed between a pair of right and left grounding wheels 4 having a required outer diameter and is separated from the operation pipe 1. It is configured to be able to move and travel on the ground. The output shaft of the engine 3 and the power transmission shaft are connected by a flexible shaft 31.
The flexible shaft 31 is covered by a flexible member 32 that connects the output portion of the engine 3 and the base end of the operation pipe 1.

As shown in FIG. 2, the engine 3 is a relatively small engine having a displacement of about 25 cc, and has a fuel tank 33 disposed below the engine 3 as shown in FIG. Things. The grounding wheel 4 has an outer diameter at least larger than the height of the engine 3 and is made of a rigid material such as iron. Also,
Although not shown, an elastic material such as rubber may be provided on the outer periphery to reduce running vibration.

Further, an axle 41 is provided at the center of the contact wheel 4, and an engine mounting bracket 42 having a U-shaped cross section is provided across the axles 41, 41.
41 is rotatably supported by the shaft. The height of the engine mounting bracket 42 is determined such that the output shaft 31 of the engine 3 is located on the line of the axles 41, 41 in this embodiment. The engine 3 is installed above. Therefore, the engine 3 having the grounding wheel 4 has a structure in which the heavy fuel tank is provided on the lower side and the center (center of gravity)
Is stable on the line of the axles 41, 41, and can travel on the ground without breaking the balance. Further, as shown in FIG. 2, a carrying tote 43 may be provided on the engine installation bracket 42.

Further, a movement restricting member 6 is rotatably supported on the axles 41, 41. As shown in FIGS. 2 and 3, the movement restricting member 6 is an L-shaped metal member having a required width, and the length from the pivot portion to the end is longer than at least the radius of the grounding wheel 4. ing. As shown in FIG. 3, when the ground contact wheel 4 runs on the protruding side of the flexible shaft 32 (to the left in the drawing), the movement restricting member 6 is simply dragged and does not restrict the running. When the ground contact wheel 4 attempts to travel in the direction (rightward direction in the drawing), the end of the movement restricting member 6 hits the ground, and functions to regulate the traveling.

Next, the operation of the bush cutter constructed as described above will be described. When performing the mowing operation, the engine 3 is first started, and the power of the engine 3 is transmitted to the rotary blade 21 via the flexible shaft 31 and the power transmission shaft inserted into the operation pipe 1. Then, the operator holds the control handle 11, adjusts the throttle lever 5, and shakes the control handle 11 right and left to perform the mowing operation. In addition, when moving, the engine 3 having the ground contact wheel 4 is moved and traveled by pulling the flexible member 32 so as to operate the vacuum cleaner.

At this time, since the operator has only the operation pipe 1, he can easily perform the mowing operation without feeling an excessive weight burden. Further, since the engine 3 is separated from the operation pipe 1 and is on the ground, the work can be performed comfortably without feeling noise and vibration.

Further, even when the working ground has irregularities, the engine 3 provided with the ground contact wheel 4 has a good balance, so that it can run stably without falling down. Even when the unevenness is large, the bottom surface of the engine ground bracket 42 becomes like a sled, and the unevenness can be overcome.

Further, even when working on a slope, the operator moves and runs in the direction in which the operator pulls the engine 3, but is prevented from moving by the movement restricting member 6 in the opposite (reverse) direction. Runaway 3 can be prevented, and work safety can be ensured.

Although the embodiments of the present invention have been described above, in the embodiments, the cutting blades have been described using the rotary blades, but the present invention is not limited to this, and other cutting blades such as reciprocating blades and cord blades can be used. May be used.

[0023]

As described above, according to the present invention, the power source for driving the cutting blade portion is located between a pair of right and left ground wheels having a required outer diameter traveling on the ground, and Since the center is located on the axle of the left and right ground wheels, it is mounted and supported so that it can move on the ground, so the operator has only the operation pipe and pulls the drive source easily without feeling noise and vibration. The mowing operation can be performed while the drive source is
You will be able to travel on the ground stably without breaking the balance.

In addition, despite the configuration in which the driving source is separated, the operating section for controlling the driving of the driving source is provided on the operating pipe of the operator, so that the mowing operation can be performed properly.

Further, since the movement restricting member is supported by the power source mounted and supported between the pair of right and left ground wheels, particularly in a mowing operation on an inclined ground or the like, the moving source moves in the direction in which the operator pulls the driving source. However, since the movement is prevented by the movement restricting member in the opposite (retreat) direction, runaway of the drive source due to inclination can be prevented, and work safety can be ensured. .

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a brush cutter according to an embodiment of the present invention.

FIG. 2 is a front view of an engine mounted state of the brush cutter according to the embodiment of the present invention.

FIG. 3 is a side view showing a state in which an engine of the brush cutter according to the embodiment of the present invention is mounted.

FIG. 4 is an explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operating pipe 11 Control handle 2 Cutting blade 21 Rotating blade 3 Engine 31 Flexible shaft 32 Flexible member 33 Fuel tank 4 Grounding wheel 41 Axle 42 Engine installation bracket 43 Totte 5 Throttle lever 6 Movement restricting member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Megumi Fujiwara 482-1, Otami, Okayama-shi, Okayama Pref. (72) Inventor Hisayuki Ueyama 482-1, Otoda, Okayama-shi, Okayama Pref.

Claims (3)

[Claims] A power transmission shaft is inserted into an operation pipe having a required length, and a cutting blade portion driven at the tip of the operation pipe through the shaft is provided. The power source is separated between a pair of left and right ground wheels having a required outer diameter traveling on the ground, and the center of the power source is connected to the left and right ground wheels. A flexible shaft that is mounted and supported so as to be located on the axle line so as to be movable on the ground, and that connects an output portion of the power source and a base end portion of the operation pipe by a flexible member, and is inserted into the flexible member. And a power transmission shaft in the operation pipe, which is connected to the output portion of the power source by a power transmission. 2. A brush cutter according to claim 1, further comprising an operation section for controlling an output of the power source, provided on a base end side of the operation pipe, and performing drive control of the power source from the operation pipe side. A brush cutter characterized in that: 3. The brush cutter according to claim 1, wherein the power source mounted between and supported by the pair of right and left grounding wheels is supported by a movement restricting member, and the power source includes an operating pipe. Characterized in that the brush cutter does not operate in the direction in which it is pulled toward the side, but is movably supported so as to prevent movement in the reverse direction.