JPS5820085Y2 - backpack-type power brush cutter - Google Patents

Description

[Detailed description of the invention] This invention attaches a cutting blade to the tip of the handle rod, and connects the output end of the engine placed on the backpack frame and the rear end of the handle rod using a flexible tube with a built-in flexible drive shaft. This invention relates to an improvement of a backpack-type power brush cutter that cuts grain, weeds, bushes, etc. by transmitting the driving force of an engine to a cutting blade through a drive shaft to rotate the cutting blade.

A commonly used brush cutter of this type is shown in FIG. 5.

However, when this brush cutter is used for cutting grass, there is a drawback that the machine body is unstable due to the moment in the P direction generated by the weight of the cutting blade portion a', making the work difficult.

In addition, in order to maintain balance, it was necessary to apply more force than necessary to the left and right grips btb, causing severe fatigue in both hands and arms of the operator, making it difficult to withstand long hours of work.

Also, when the cutting blade a collides with an obstacle T such as a stone or stump while rotating in the S direction, the reaction force F causes the handle C to pivot in the N direction, and the operator's hand grips b.

There was a risk that a dog could cause an accident that could result in injury or death.

Also, as shown in the figure, the worker works with his armpits loose.

Since the machine is supported, there is a misalignment between the movement of the worker's hands and arms and the machine body, making it difficult to work accurately and smoothly, and the support of the machine body is unstable, resulting in a lack of safety.

Therefore, it is extremely difficult to perform mowing work by turning the handle violently from side to side, work on uneven ground or sloped land, and work in places where the material to be cut is located above.

The purpose of this invention is to eliminate the various deficiencies of the above-mentioned conventional examples.It allows all operations to be performed smoothly, accurately, and quickly, reduces fatigue even during long-term mowing operations, and is safe. The purpose of the present invention is to provide an extremely superior backpack-type power brush cutter.

The present invention will be explained in detail 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 an engine 4 is placed on a backpack frame 3, and the output end of this engine 4 and the rear end of the handle rod 1 are connected. are connected by a flexible tube 5 with a built-in flexible drive shaft.

7 is a forearm base support placed on the rear and lateral sides of the handle rod 1;
It restrains at least both sides and the lower surface of the worker's forearm base A, and is supported by the forearm base A.

For example, as shown in FIG. 2, this forearm base support 7 can be composed of a lower support 8 formed of a U-shaped rigid body and an upper band 9 attached to the upper part of the lower support 8.

The lower bracket 8 is welded to the side surface of a base body 11 consisting of a pair of split metal fittings fastened to the handle rod 1, and a slowing member 10 made of rubber or the like is attached to the inner peripheral surface of the lower bracket 8. It is pasted.

The dimensions of this lower support 8 are determined so that it can restrain both sides and the lower surface of the worker's forearm base A.

On the other hand, the upper band 9 is for restraining the upper surface of the forearm base A, and is formed so that the forearm base A can be tightened by attaching a tightening fitting 6.

For safety reasons, it is preferable that the upper band 9 be formed so that it can be removed instantly.

It is preferable that the forearm base support 7 is formed so that its attachment position can be adjusted in the axial direction of the handle rod 1.

Reference numeral 12 denotes a first grip part protruding from one side of the handle rod 1, which is located in front of the forearm base support 7 and grips the forearm base A by the side B on the side restrained by the forearm base support 1. Ru.

Reference numeral 13 denotes a second grip portion protruding from the other side of the handle rod 1, which is gripped by the other hand.

As described in the above-mentioned embodiment, the present invention has the following features: ``A forearm base support 7 formed to restrain at least both sides and the lower surface of the worker's forearm base A is attached to the rear lateral side of the handle rod 1, A first grip part 12 is provided in front of this, which is gripped by the hand of the side supported by the forearm base support 7, and the other hand is placed in front of this first grip part and on the opposite side to the handle rod 1. It is characterized by being provided with a second grip part 13 that can be gripped by.

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

In the present invention, the machine body is supported by three points on both sides of the handle rod, that is, the forearm base support 7, the first grip part 12, and the second grip part, and the weight of the cutting blade part 2' is used to support the machine body in the P direction. Since the moment is supported by the worker's forearm R via the forearm base support 7, the balance of the machine body is maintained extremely well.

Moreover, almost no effort is required to maintain this balance (as shown in Figure 1, if the left arm is extended and the button is pressed, the reaction force of both the moment in the P direction and the moment in the N direction is applied to the base of the forearm. The operator only experiences a slight compressive force from the tool 7 pushing the elbow upward in the axial direction of the upper arm, and the force hardly depends on the muscular strength of the operator to stabilize the machine.

), there is almost no fatigue in the hands and arms of the worker, and the worker does not get tired even during long hours of work.

Further, the right forearm R of the worker and the handle rod 1 are in an integral relationship (the moment in the P direction acts to integrate the two),
Since the movement of the worker's right forearm R and the movement of the handle rod 1 can be integrated, and the right upper arm E can move freely without being restricted in any way, the worker can operate the handle rod 1 according to his will. be able to.

Furthermore, since the forearm base support 7 is disposed on the rear and lateral sides of the handle 1, the operator can support the machine by holding the handle rod 1 between the right forearm R1, right hand B, and left hand. can.

Therefore, the force exerted by the right forearm B of the worker is reliably transmitted via the side surfaces 14, 14 of the forearm base support 7 (i.e., the force exerted by the worker's right forearm B is transmitted through the side surfaces 14, 14 of the forearm base support 7) (i.e., the force exerted by the worker's right forearm B is transmitted through the side surfaces 14, 14 of the forearm base support 7). (can be easily operated by rotating the first grip part 12), and the forces applied by the left and right 1000 B and D are added to this, and the left and right rotation of the handle lever 1 is smoothly operated.
It can be done accurately and quickly.

The most important feature of this invention is that the operator supports the machine with his arms tightened and can operate the handle rod 1 in unison with the movement of the right front R. The greatest effect of this invention is that it is possible to transmit information to the machine most efficiently, to control the operator's intentions, and to work in a comfortable posture with less fatigue.

Further, as a result, mowing work performed by turning the handle rod 1 violently from side to side, and work on uneven ground or sloped land can be performed extremely smoothly, accurately, and quickly.

Furthermore, according to the present invention, even if the cutting blade 2 hits an obstacle T such as a stump while performing a cutting operation in the S direction as shown in FIG. Rotation of the rod 1 can be reliably prevented.

The axial rolling force in the N direction is applied to the lower surface 15 of the forearm base support 7.
This is because it comes into contact with the lower surface of the worker's forearm base A and is thereby blocked.

Moreover, the support reaction force acting on the base of the worker's forearm is only felt as a slight compressive force that compresses the worker's upper arm in the axial direction, and the worker does not need to use his or her muscular strength. Even a fairly large shaft rolling force in the N direction can be easily stopped.

Therefore, it is possible to overcome the reaction force and hold the aircraft body, thereby preventing the occurrence of personal accidents.

Further, according to the present invention, work can be carried out smoothly even when the object to be cut is located above.

That is, in this case, as shown in FIG. 4, it is possible to block the moment in the P direction at the lower surface 15 of the forearm base support 7, but by moving the forearm base A up and down,
This has the effect that the angle of inclination of the handle rod 1 can be controlled upward.

Moreover, since the right forearm R is located on the lateral side of the handle 1,
The worker's posture is completely natural, and the worker can continue working with ease and without fatigue.

As described above, according to the backpack-type power brush cutter according to the present invention,
The engine 4 is supported on the back of the worker via the backpack frame 3, while the weight of the handle is supported by skillfully utilizing the skeleton of the worker's upper body and arms. After all, the operator does not have to use lateral muscle strength to support the weight of the brush cutter.

The worker's muscular strength can be used only to turn the handle in the up, down, left and right directions, and since that force is effectively transmitted to the handle at three points, the operability is improved compared to conventional methods. It increases dramatically.

The present invention has the functions and effects as described above, but if the forearm base support 7 is taken over so as to restrain the worker's both sides and not only the bottom but also the top, as shown in FIG. Even if the cutting blade 2 hits an obstacle in front and the machine tries to bounce back toward the worker as a reaction, this is prevented by the forearm base support 7 that comes into contact with the front of the worker's upper arm E. be able to.

Therefore, it is possible to eliminate accidents such as cutting a leg due to the cutting blade 2 that rebounds, which is extremely effective as a safety measure.

Further, the integral relationship between the right forearm R of the worker and the handle rod 1 can be further strengthened, and the operability can be further improved.

As mentioned above, the present invention has a simple structure, and even when cutting grass under various adverse conditions, the work can be done smoothly, accurately, and quickly, with less fatigue on the worker, and with safety. The effect is also favorable from above.

[Brief explanation of the drawing]

1 to 4 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 FIGS. 3 and 4 are perspective views showing the working state. , FIG. 5 is a perspective view of a conventional example. 1...handle, 2...cutting blade, 3...back frame, 4...
...Engine, 7.. Forearm base support, 12.. First grip portion, 13.. Second grip portion, A.. Forearm base.

Claims (2)

[Scope of utility model registration request] (1) A backpack-type power mower with a cutting blade attached to the tip of the handle rod, and a flexible tube with a built-in flexible drive shaft connecting the output end of the engine placed on the backpack frame and the rear end of the handle rod. In the hair removal machine, a forearm base support 7 formed to restrain at least both sides and the lower surface of the worker's forearm base is attached to the rear and lateral sides of the handle rod 1, and is supported by the forearm base support 7 in front of it. A first grip part 12 is provided to be gripped by the hand on the side to be held, and a second grip part 13 is provided in front of the first grip part and on the opposite side of the handle 1 to be gripped by the other hand.
A backpack-type power brush cutter characterized by being equipped with. (2) The backpack-type power brush cutter according to claim 1, wherein the forearm base support 7 is formed so as to be able to restrain the circumference of the forearm base of the worker.