JP2000084869A - Shouldered type working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shouldered type working machine which can make this shoulder frame to be supported by a worker more stably without enlarging the shoulder frame. SOLUTION: This shouldered type working machine is provide with a shoulder frame 30 supported to both shoulders or back of a worker through a shawl belt 20, an engine 40 mounted and supported to this shoulder frame 30, an operation pipe 50 connected to the output part of this engine 40 through a flexible transmission means and having a working body 60 operated by the output of the engine 40 on its tip. One end of the shawl belt 20 can not be turned in the front/rear direction for the upper part of the shoulder frame 30 and is connected to the upper end of the hang member 70 with a prescribed length provided turnably in right/left directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backpack working machine, for example, by supporting an engine occupying a large part of the total weight on a worker's back via a backing frame, such as a backpack brush cutter. It relates to things that work.

[0002]

2. Description of the Related Art FIG. 6 shows the structure of a conventional back-type brush cutter. The engine 40 is mounted on the carrying frame 30.
The shoulder frame 20 and the backrest mat 34 are attached to the backrest frame 30. Therefore, the shoulder frame or the engine 40 mounted on the backrest frame 30 allows the operator to carry the shoulder belt 20 and the backrest mat 34 via the shoulder belt 20 and the backrest mat 34. Supported on both shoulders or back. A flexible transmission shaft passed through a flexible tube 51 is connected to an output portion of the engine 40. An operating pipe 50 having rigidity is connected to the flexible tube 51. Inside the operating pipe 50, a transmission shaft to which the rotational force from the flexible transmission shaft is transmitted is incorporated. I have. In addition, a rotary blade 60
The rotary blade 60 is rotated by the rotation output of the engine 40 transmitted by the transmission shaft. An operation grip 5 for gripping and swinging the operation tube 50 by an operator is provided at an appropriate portion of the operation tube 50.
2, and a throttle lever and the like for controlling the number of revolutions of the engine 40 are attached.

[0003] According to the above-structured brush cutter, the weight of the engine, which accounts for a large part of the total weight, is supported on the shoulders or back of the worker, and the arms are burdened for supporting the engine. Because it does not require, compared to an engine-integrated brush cutter in which the engine is integrally connected to the rear end of the operation tube, it is said that the operation tube is supported by both hands, and the brushing operation by swinging this can be performed easily. There are advantages.

[0004]

The back frame includes a horizontal support portion 31 to which the lower portion of the engine 40 is connected, a rising portion 32 extending upward from a front portion of the horizontal support portion 31,
An upper extension 33 is provided extending from the upper end of the rising portion 32 and connected to the upper portion of the engine. At the same time, the upper end of the shoulder belt 20 is connected to the upper extending portion 33, and the forked lower end of the shoulder belt 20 is connected to an appropriate portion of the rising portion 32.

By the way, in order to minimize the influence of the heat generated by the engine on the worker's body, a certain clearance is provided between the engine 40 mounted on the shoulder frame 30 and the rising portion 32 of the shoulder frame 30. Therefore, the center of gravity of the carrying frame 30 in a state where the engine 40 is mounted must be located considerably behind the rising portion 32.

Therefore, when the back frame 30 is mounted on the body of the worker, as shown in FIG. 7, the entire back frame 30 is inclined rearward, and the upper part of the back support mat 34 is separated from the back of the worker. Unstable state. That is, if the worker walks or swings the operation pipe in such a state, or leans his body in the slope work, the backpack frame 30 swings unnecessarily, and all movements of the worker become unstable. Become Further, there is a problem that the exhaust gas of the inclined engine 40 hits the feet of the worker.

Such a problem can be reduced to some extent by extending the upper part of the backpack frame 30 further upward and moving the upper and lower connecting positions of the backpack belt 20 further upward.
In such a case, the size of the carrying frame 30 becomes larger than the size required for the function of mounting and supporting the engine 40, and another problem such as an increase in weight, packing, and transportation costs is caused.

The present invention has been conceived in view of the above circumstances, and allows a worker to more stably support the carrying frame without increasing the size of the carrying frame. It is an object of the present invention to provide a backpack type working machine.

[0009]

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

That is, the backpack-type working machine according to the present invention comprises a backing frame supported on both shoulders or back of a worker via a shoulder belt, an engine mounted and supported on the backing frame, and an output of the engine. And a control pipe having a working body at the tip thereof that is operated by the output of the engine, wherein one end of the shoulder belt is connected to the backrest. It is characterized in that it is not rotatable in the front-rear direction with respect to the upper part of the frame, but is connected to the upper end of a suspension member of a predetermined length provided rotatably in the left-right direction.

In a preferred embodiment, the back frame includes an engine supporting portion to which the lower portion of the engine is connected, a rising portion extending upward from a front portion of the engine supporting portion, and a rearward or oblique direction from an upper end of the rising portion. A rear extending portion extending rearward, and the suspending member is provided at a portion of the rear extending portion located a predetermined distance behind the rising portion.

In a preferred embodiment, the shoulder belt has one end connected to the suspension member,
The other end part is bifurcated from this one end part, and one end part is connected to the hanging member,
The other end is connected to an appropriate left and right portion of the rising portion of the backpack frame.

The shoulder belt for supporting the carrying frame on the worker's body is for supporting the carrying frame by hanging it on both shoulders of the worker. As described above, in a preferred embodiment, The forked part is bifurcated from one end connected to the upper part of the backpack frame, the forked part is hung on both shoulders of the worker, and the end part is connected to an appropriate part of the rising part of the backpack frame. That is, this carrying frame is supported on both shoulders or the back of the worker like a rucksack.

In the present invention, a suspending member having a predetermined length is provided above the backrest frame, and one end of the shoulder belt is connected to the suspending member. In addition, the suspension member can rotate in the left-right direction, but cannot rotate in the front-rear direction. In other words, the upper end of the suspension member extends further upward from the upper end of the backrest frame and is rigid in the front-rear direction. Therefore, when the shoulder frame is worn on the body via the shoulder belt, the shoulder belt acts to draw a predetermined distance above the upper end of the shoulder frame to the worker's back. Such an effect is obtained by increasing the distance from the connection portion at one end of the shoulder belt to the backrest frame and the center of gravity of the engine mounted on the backrest frame as compared with the related art. As a result, the backrest frame has the front surface of the rising portion properly in close contact with the worker's back, and a stable mounting state is obtained.

The hanging member is rotatable left and right with respect to the backrest frame. Therefore, when this work machine is not used, the hanging member can be folded and the storage space for the work machine can be saved. In addition, the carrying frame itself does not become unnecessarily large, and an increase in weight, packaging, and transportation costs can be suppressed to a minimum.

Further, since the suspension member can be rotated left and right in the body-mounted state, the rotation of the shoulder of the worker is allowed, and the effect of swinging the operation tube can be expected more easily. .

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

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to FIGS.

The embodiment shown in FIG.
It is configured as As shown in FIG. 1, the backpack brush cutter 10 includes a backrest frame 30 supported on both shoulders or back of a worker by a shoulder belt 20, a small gasoline engine 40 mounted on the backrest frame 30, and the engine. An operation tube 50 is connected to an output portion of the operation tube 40 via a flexible tube 51, and a rotary blade 60 supported at a distal end portion of the operation tube 50. Tube 51
Or at least a tube 51 inside the operation tube 50.
A transmission shaft (not shown in the drawing) having flexibility is incorporated in a portion that passes through the inside, and the rotation output of the engine 40 rotates the rotary blade 60 via the transmission shaft. A grip 52 for the operator to grip and swing the operation tube 50, a throttle lever (not shown) for controlling the rotation speed of the engine 40, and the like are attached to the operation tube 50. .

The backing frame 30 has a horizontal engine support portion 31 on which the engine 40 is mounted and supported, a rising portion 32 extending upward from the front of the engine support portion 31, and a rising portion 32 of the rising portion 32. In the embodiment shown in the drawings, the extension portion 33 is formed by bending a metal pipe. That is, the engine support portion 31 includes a pair of left and right parallel pipe portions 31a and 31b and the parallel pipe portion 31.
a, 31b and a U-shaped pipe section 31b connecting the rear ends of the pipes. The rising portion 32 rises upward from the front end of each of the pair of parallel pipe portions 31a, 31b of the engine support portion 31 and approaches a mutually upwardly rising pair of rising pipe portions 32a, 32a.
2b. Further, the extension portion 33 has a form in which the pair of right and left upright pipe portions 32a and 32b is bent rearward in a state of being brought close to each other. And this extension part 33 is a pair of pipes 33a,
A connecting member 36 made of sheet metal is provided to hold and fix the members 33b. On the front surface of the rising portion 32 of the backpack frame 30, a backrest mat 34 is provided which is in close contact with the worker's back and reduces the impact.

A cross member 31 extending between the pair of parallel pipe portions 31a and 31b is also provided on the engine support portion 31.
c is provided, and a cylindrical shaft 35 is provided upright at the center of the cross member 31c, as shown in FIG. The cylindrical shaft 35 rotatably supports a shaft portion 41 protruding from a lower portion of the engine 40. A shaft portion 42 having the same vertical axis as the lower shaft portion 41 protrudes from an upper portion of the engine 40, and the upper shaft portion 42 is connected to the upper extending portion 3 of the backrest frame 30.
3 is rotatably supported. Thereby, the engine 40 is supported on the backing frame 30 so as to be rotatable about a vertical axis passing through the cylinder shaft 35. It is desirable that the shaft portions 41 and 42 provided above and below the engine 40 be set so as to pass through the center of gravity of the engine 40 as much as possible, in order to smoothly rotate the engine 40 on the carrying frame 30. Also, the rising part 3 of the carrying frame 30
It is desirable to provide a predetermined clearance between the engine 2 and the engine 40 in order to reduce the influence of the heat generated by the engine 40 on the operator.

As described above, the engine 40 is
Is rotatable about an up-down axis, so that an operation tube 5 connected to an output portion of the engine 40 via a flexible tube 51 or a flexible transmission shaft.
The left and right swing operation can be easily performed.

The shoulder strap 20 has one end 21 located above the backrest frame 30 and shoulders 22a and 22b which are bifurcated from the one end. The one end 21 and the shoulder 22a are provided. , 22b, a connecting ring 23 is attached to each end. A shoulder pad 24 is attached to each of the shoulder portions 22a and 22b.

The above-mentioned one end 21 of the shoulder belt 20 is connected to a shoulder frame 30 via a suspending member 70 which will be described in detail later.
Of the shoulder 22
a, 22b are connected to the backing frame 3 via the connecting fitting 38.
0, more specifically, to the right and left upright pipe portions 32a, 32b.

In the present invention, the suspension member 70
Has a predetermined length and is rotatable in the left-right direction with respect to the upper extension portion 33 of the backpack frame 30, but is attached so as not to rotate in the front-rear direction. In the embodiment shown in the drawings, the hanging member 70 is formed by bending a metal rod to have a lower rectangular ring 71 and an upper circular ring 72, and a lower rod 71a forming the lower rectangular ring 71.
Are supported by being inserted into support holes 37 formed by cutting and raising a metal plate on the upper surface of the connection member 36. Thereby, the hanging member 70 is connected to the lower rod 71 of the lower rectangular ring 71.
a can be turned around the support shaft. The support hole 37 for supporting the lower rod 71a is formed to extend in the front-rear direction of the connecting member 36. Therefore, the suspending member 70 can rotate in the left-right direction with respect to the upper extension portion 33 of the backrest frame 30, but cannot rotate in the front-rear direction. In other words, the hanging member 70
It becomes rigid in the front-back direction. In addition, this hanging member 70
It is desirable that the mounting position is disposed at a predetermined distance behind the rising portion 33 of the backpack frame 30 in order to alleviate the feeling of cramp due to the shoulder belt 20 when worn on the body. In addition, since the suspension member 70 approaches the vertical axis passing through the center of gravity of the engine 40 in this way, the inclination of the engine 40 when the backrest frame 30 is worn by an operator can be further reduced.

As shown in FIG. 4, the backpack frame 30 of the backpack-type brush cutter 10 having the above structure is mounted on the body of the worker as if carrying a rucksack. That is, the shoulder belt 20 is hung on both shoulders of the worker, and the weight of the backpack frame 30 or the engine 40 is supported on both shoulders of the worker. And, by the action of gravity, the shoulder frame 30
Is brought into close contact with the operator's back.

At this time, one end 21 of the shoulder belt 20 is connected to the extending portion 3 of the shoulder frame 30 via the suspending member 70 described above.
3 and the suspension member 70 is rotatable in the left-right direction, but is not rotatable in the front-rear direction.
In other words, the upper end of the hanging member 70 is
0 extends further upward from the upper end, and is rigid in the front-rear direction. Therefore, the shoulder belt 20 acts to draw a predetermined distance above the upper end of the shoulder frame 30 toward the worker's back. Such an effect is caused by the fact that the distance from the connecting portion of the one end 21 of the shoulder belt 20, that is, the upper circular ring portion 72 of the suspension member 70 to the shoulder frame 30 or the total center of gravity of the engine mounted on the shoulder frame 30 is smaller than in the past. Obtained by lengthening. As a result, as shown in FIG. 4, the backrest mat 34 on the front surface of the rising portion 32 of the backrest frame 30 properly adheres to the worker's back, and a stable mounting state is obtained.

Moreover, the hanging member 70 is mounted on the backing frame 3.
It can rotate in the left-right direction with respect to 0. Therefore, when this work machine is not used, the hanging member 70 can be folded in the left-right direction, and the storage space for the work machine can be saved. In addition, the size of the carrying frame 30 itself is not increased unnecessarily, and an increase in weight, packaging, and transportation costs can be suppressed to a minimum.

Further, since the hanging member 70 can be rotated left and right in the body-mounted state, the backrest mat 34
The rotation of the operator's shoulder while the body is kept in close contact with the back is allowed, and the effect of twisting the upper body and swinging the operation tube 50 in the left-right direction can be expected.

As described above, in the backpack type working machine according to the present invention, the backrest frame can be supported by the worker more stably without increasing the size of the backrest frame, and stable work can be performed. It is possible to do.

Of course, the scope of the present invention is not limited to the above-described embodiment, and various changes can be made within the scope of the items described in the claims. The specific structure of the carrying frame and the support structure of the engine are not limited. The shoulder belt can also connect one end of two separate belts to the suspension member. The working body is not limited to the rotary blade. Further, the specific form of the operation tube is not limited.

Further, the form of the suspension member 70 is not limited to the above-mentioned form, and as shown in FIG. And a shaft 71,
The 71 may be rotatably inserted and supported in a support hole 37 formed in the connecting fitting 36 of the extension 33 of the backpack frame 30 via the standing pieces 38, 38.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an embodiment of a backpack-type working machine according to the present invention.

FIG. 2 is a side view of a shoulder frame of the working machine shown in FIG. 1 and an engine mounted thereon.

FIG. 3 is a perspective view of a main part of the working machine shown in FIG. 1;

FIG. 4 is a diagram for explaining the operation of the present invention.

FIG. 5 is a perspective view of a main part of another embodiment of the present invention.

FIG. 6 is an overall perspective view of a backpack type working machine according to a conventional example.

FIG. 7 is a diagram for explaining a problem of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 backpack working machine 20 shoulder belt 21 one end of shoulder belt 30 backrest frame 31 engine support portion of backrest frame 32 rising portion of backrest frame 33 extension portion of backrest frame 34 backrest mat 40 engine Reference Signs List 50 Control tube 60 Work body (rotary blade) 70 Suspension member

Claims (3)

[Claims] 1. A backpack frame supported on both shoulders or a back of a worker via a shoulder belt, an engine mounted and supported on the backframe, and an output portion of the engine connected to a power transmission means via a flexible transmission means. And an operating pipe having a working body at the tip thereof that is operated by the output of the engine, wherein one end of the shoulder belt rotates in the front-rear direction with respect to the upper part of the backing frame. A shoulder-type work machine, which is immovable and is connected to an upper end portion of a suspension member having a predetermined length provided to be rotatable in the left-right direction. 2. The backrest frame includes an engine supporting portion to which the lower portion of the engine is connected, a rising portion extending upward from a front portion of the engine supporting portion, and a rearward or obliquely rearward portion from an upper end of the rising portion. 2. The shoulder-type work according to claim 1, further comprising a rear extending portion that extends, wherein the suspending member is provided at a position located a predetermined distance behind the rising portion in the rear extending portion. 3. Machine. 3. The shoulder belt has one end connected to the hanging member and the other end branched in a forked manner from the one end, and one end is connected to the hanging member. 3. The backpack-type working machine according to claim 1, wherein the other end is connected to a right and left suitable portion of a rising portion of the backpack frame. 4.