JPH10313635A - Rotary blade for bush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the scattering of soil and small stones without bringing a blade into contact with a ground surface and to improve the operability of a bush cutter by an operator. SOLUTION: This rotary blade 3 for bush cutter used for a bush cutter for cutting weeds and rotated by driving force transmitted from a driving force source is provided with a disk-shaped rotating body 31 rotated by the driving force from an engine to be the driving force source and the blade 32 in a thin plate shape attached in the posture of extending a projected end from the peripheral edge part of the rotating body 31 whose projected end part 32b is bent at a prescribed angle β to the rotating body 31. An end part 32c arranged oppositely to the projected end part 32b of the blade 32 is also bent at the prescribed angle β to the rotating body 31 and blade tips 32e and 32f are respectively formed in the posture of facing each other in the rotating direction of the rotating body 31 on both sides of the projected end part 32 and the end part 32c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade for a brush cutter, which is used in a brush cutter for weeding and is rotated by a driving force transmitted from a power source such as an engine.

[0002]

2. Description of the Related Art Generally, a brush cutter for weeding is an engine serving as a power source, an operating pipe having the engine mounted at one end and a rotary blade supported at the other end in a state of being supported by a rotary blade, and an engine. In order to transmit the driving force to the rotary blade, a transmission shaft inserted into the operation pipe, a handle attached in the middle of the operation pipe, and the like are provided, and such a brush cutter is transmitted from the engine via the transmission shaft. The rotating blade is configured to be rotated by the applied driving force.

In this type of brush cutter, an operator grips a grip of a handle attached in the middle of the operation tube, and moves a rotary blade pivotally supported at the tip of the operation tube left and right as viewed from the operator. Meanwhile, the mowing operation is performed by the worker himself moving.

A rotary blade for a brush cutter used in such a brush cutter includes a disk which is rotated by a driving force from an engine,
And a thin plate-shaped blade attached with a protruding end extending from the peripheral edge of the disc, and the protruding end of the blade has a cutting edge formed in a posture facing the rotating direction of the disc. I have.

[0005] In the rotary blade for a brush cutter having such a configuration, when the rotary blade rotates, the protruding end of the blade extending from the peripheral edge of the disc also rotates, and the blade of the rotating protruding portion causes the leaf stem of the weed. Has been cut and the weeds have been trimmed.

[0006]

However, in the conventional rotary blade for a brush cutter described above, when the brush cutter is used in a normal condition, that is, the disk of the rotary cutter is not parallel to the ground but is somewhat parallel to the ground. In a situation where the blade moves left and right so as not to contact the ground at an angle of, the protruding end of the blade extending from the peripheral edge of the disk may come into contact with the ground. If the tip of the rotating blade comes into contact with the ground in such a situation, the tip will fly off the soil and pebbles on the ground and scatter around it. This was an obstacle, making it difficult for the operator to operate the brush cutter.

The present invention has been conceived in view of the above circumstances, and prevents the scattering of soil and pebbles without bringing the tip of the blade into contact with the ground. It is an object of the present invention to provide a rotary blade for a brush cutter that can improve the operability of the brush cutter.

[0008]

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

That is, the rotary blade for a brush cutter according to the first aspect of the present invention is used for a brush cutter for cutting weeds, and is a rotary blade for a brush cutter that is rotated by a driving force transmitted from a power source. A rotating body that is rotated by a driving force from the power source, and a protruding end is attached to the rotating body at a predetermined angle with respect to the rotating body, while the protruding end is attached to the rotatable body. And a blade.

[0010] The rotary blade for a brush cutter according to the second aspect of the present invention is the rotary blade for a brush cutter according to the first aspect,
The blade is characterized in that a distal end opposed to the protruding end is bent at a predetermined angle with respect to the rotating body.

According to a third aspect of the present invention, there is provided a rotary blade for a brush cutter according to the first or second aspect, wherein the blade includes a rotating direction of the rotary body. Is characterized in that the cutting edge is formed in a posture opposite to.

In the rotary blade for the brush cutter according to the first aspect of the present invention, the rotating body is not parallel to the ground, but is moved right and left so as not to contact the ground at some angle. When moving, the tip of the blade passing through the position closest to the ground, the predetermined angle bent with respect to the rotating body is subtracted from the angle between the rotating body and the ground, so that the blade is substantially in contact with the ground. The parallel state is maintained.

As a result, the tip of the blade, which rotates integrally with the rotating body, does not contact the ground, and prevents the tip of the blade from splashing soil and pebbles on the ground and scattering around. Have been.

Therefore, according to the rotary blade for a brush cutter according to the first aspect, the tip of the blade rotating integrally with the rotating body does not come into contact with the ground, and scattering of soil and pebbles is prevented. Therefore, it is possible to perform a normal mowing operation for mowing only weeds, and to improve the operability of the mower by the operator.

In addition, since the blade does not come into contact with the ground, the wear of the blade is reduced, and the durability of the blade can be improved.

Further, in the rotary blade for a brush cutter according to the second aspect, when the rotating body rotates, the tip of the blade also rotates integrally with the rotating body, and the tip cuts the leaf stem of the weed. . At the same time, the terminal end opposite to the protruding end rotates around the center of the rotating body at a predetermined angle with the rotating body, and the weeds are entangled near the center of the rotating body. Will be cut out.

On the other hand, when the wear of the protruding end of the blade progresses and the mowing performance deteriorates, the blade can be turned over and replaced with the end opposite to the protruding end as the protruding end. Like the original tip, the original distal end obtained by inverting the blade cuts the leaf stem of the weed while rotating at a predetermined angle with the rotating body.

Therefore, according to the rotary blade for a brush cutter according to the second aspect, since the end of the blade cuts out the weed entangled in the vicinity of the center of the rotating body, the operator himself has entangled the weed in the vicinity of the center of the rotating body. The mowing operation can be performed smoothly without removing the garbage.

[0019] In addition, since the tip and the end of the blade can be exchanged according to the degree of wear by inverting and exchanging the blade, the blade alone can be replaced as compared with the case where only one end of the blade is used. Can greatly improve the use limit.

In the rotary blade for a brush cutter according to the third aspect of the present invention, the blade edge formed at the tip or the end of the blade rotating integrally with the rotating body cuts into the leaf stem of the weed. Disconnect.

Therefore, according to the rotary blade for a brush cutter according to the third aspect, the cutting edge formed at the protruding end or the end of the rotating blade cuts into the weed leaf stem to cut the weed. Weeds can be reliably and well cut down.

The fact that such excellent effects are obtained in the present invention will be more apparent from the embodiments described below.

[0023]

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

FIG. 1 is an external perspective view showing one embodiment of a brush cutter provided with a rotary blade for a brush cutter according to the present invention.

As shown in this figure, a brush cutter 1 for cutting weeds includes an engine 2 serving as a power source, the engine 2 attached to one end, and a rotary blade 3 supported at the other end. The operating tube 4 includes a supported operating tube 4, a transmission shaft (not shown) inserted into the operating tube 4 for transmitting the driving force of the engine 2 to the rotary blade 3, and a handle 5 attached in the middle of the operating tube 4. In such a brush cutter 1, the rotary blade 3 is configured to be rotated by the driving force transmitted from the engine 2 via the transmission shaft.

The engine 2 burns fuel supplied from a fuel tank and generates driving force on a transmission shaft (not shown) by a built-in piston mechanism or the like.

FIG. 2 is a plan view showing the rotary blade 3 shown in FIG. 1, and FIG. 3 is a sectional view showing a section taken along line XX of FIG. In FIG. 2, some members are omitted for convenience.

As shown in both figures, the rotary blade 3 has a disk-shaped rotating body 31 which is rotated by the driving force from the engine 2.
And a thin plate-like blade 32 to which a plurality of blades are attached with the protruding end extending from the peripheral edge of the rotating body 31.

The rotating body 31 is formed in a disc shape from a steel material, and has a center hole 31a for connecting to a transmission shaft (not shown) at a center portion thereof, and a blade at a peripheral portion thereof. Locking hole 31b for fixing screw 32
Are opened at regular intervals. In this center hole 31a,
The tip of the transmission shaft is fixed via a fastening screw or the like.

The blade 32 is formed in a substantially rectangular thin plate shape by using a steel material, and is entirely composed of a base 32a, a protruding end 32b, and a distal end 32c.

The base 32a of the blade 32 has a rotating body 3
1, a through-hole 32d is formed in alignment with the locking hole 31b, and the through-hole 32d is connected to the locking hole 31b.
The base 32a is fixed to the rotating body 31 via a bolt / nut 33 or the like in a state where it is aligned.

The tip 32b of the blade 32 is
1 and is bent at a predetermined angle with respect to the rotating body 31. That is, the protruding end portion 32b is bent so as to be inclined upward from the vicinity of the broken line shown in FIG. 2 with respect to the ground as shown in FIG. Further, on both sides of the protruding end portion 32b, a cutting edge 32e is formed in a posture facing the rotating direction of the rotating body 31.

The end portion 32c of the blade 32 is
1 and is bent at a predetermined angle with respect to the rotating body 31 at the same angle as the protruding end 32b. That is, the distal end portion 32c is bent in such a manner as to be inclined upward from the vicinity of the broken line shown in FIG. 2 with respect to the rotating body 31 as shown in FIG. Also, the end portion 32c
A cutting edge 32f is formed on both sides of the rotating body 31 so as to face the rotating direction of the rotating body 31.

The tip 32b and the end 32c
Keeps the same shape and posture even if the blade 32 is inverted and replaced so that it is replaced with each other.

Referring again to FIG. 1, the operation tube 4 will be described.
Is bent near the distal end supporting the rotary blade 3, and the transmission shaft inserted therein is turned around by a bevel gear or the like near the bend and connected to the rotary blade 3.

The handle 5 is provided so as to easily move the rotary blade 3 supported at the tip thereof to the right and left while swinging the operation tube 4, and has a shape extending in a direction perpendicular to the operation tube 4. Grip portions 5a are provided at both ends.

Next, the operation of the brush cutter 1 having the rotary blade 3 having the above-described configuration will be described with reference to FIGS.

FIG. 4 is a conceptual diagram showing a state of a brush-cutter operation by the bush cutter 1. As shown in FIG.
Normally, the operation tube 4 is swung while the handle 5 is gripped by hanging the belt 6 wrapped around the operation tube 4 on the shoulder.

When the operation tube 4 is swung, the rotary blade 3 supported at the tip moves left and right in a posture slightly inclined with respect to the ground.

FIG. 5 is a side view showing a posture in which the rotary blade 3 is inclined with respect to the ground. As shown in FIG. 5, the rotating body 31 of the rotary blade 3 is not parallel to the ground. ,
Assuming that it does not contact the ground at an angle α,
The protruding end portion 32b of the blade 32 that passes through the position closest to the ground is substantially separated from the ground by subtracting an angle β bent against the rotating body 31 from an angle α formed between the rotating body 31 and the ground. The parallel state is maintained.

As a result, the tip 32b of the blade 32, which rotates integrally with the rotating body 31, does not come into contact with the ground, and the tip 32b of the blade 32 repels soil and pebbles on the ground and scatters around. Is prevented.

The tip 3 of the rotating blade 32
2b is a cutting edge 32 formed on both sides thereof, which is closer to the rotation direction.
e cut into the weed leaf stem.

At the same time, the distal end portion 32c opposed to the protruding end portion 32b rotates around the center of the rotating body 31 while maintaining an angle β with the rotating body 31. 32f is the operation tube 4 near the center of the rotating body 31
Cut out the weeds that get entangled in the.

On the other hand, when the wear of the tip 32b of the blade 32 progresses and the mowing performance deteriorates, the tip 3b
The blade 32 is turned over and replaced with the end 32c opposed to 2b as a protruding end.

Then, the original distal end portion 32c, which is a protruding end obtained by inverting the blade 32, has the same shape and posture as the original protruding end portion 32b. The leaf stem will be cut off.

As will be understood from the above description, according to the brush cutter 1 having the rotary blade 3 having the above configuration and operation,
The effects listed below can be obtained.

Since the tip 32b of the blade 32, which rotates integrally with the rotating body 31, does not contact the ground and the scattering of soil and pebbles is prevented, a normal mowing operation for mowing only weeds can be performed. This can improve the operability of the bush cutter 1 by the operator.

Since the blade 32 does not come into contact with the ground, wear of the blade 32 is reduced and the blade 32
Can be improved in durability.

The end portion 32c of the blade 32 is
Since the weeds entangled in the vicinity of the center of the rotating body 31 are cut off, the worker himself can perform the mowing operation smoothly without removing the weeds entangled in the vicinity of the center of the rotating body 31 by hand.

Since the tip 32b and the end 32c of the blade 32 can be replaced according to the degree of wear by inverting and replacing the blade 32, compared with the case where only one end of the blade 32 is used. The use limit of the blade 32 alone can be remarkably improved.

The cutting edge formed at the protruding end portion 32b or the end portion 32c of the blade 32 rotating integrally with the rotating body 31 cuts the weed by cutting into the leaf stem of the weed, so that the weed can be efficiently and reliably removed. You can mow.

In this embodiment, the blade 32
Are provided at the peripheral portion of the rotating body 31, but the number is not particularly limited to six, and may be a smaller number.
In order to obtain a constant mowing ability, it is preferable that the number of blades is such that the gap between the blades 32 has a constant interval.

The angle of the protruding end portion 32b of the blade 32 with respect to the rotating body 31 may be larger or smaller than the angle shown in FIGS. The angle may be steeper or gentler than the illustrated angle, depending on the angle between them.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of a brush cutter provided with a rotary blade for the brush cutter according to the present invention.

FIG. 2 is a plan view showing the rotary blade shown in FIG.

FIG. 3 is a sectional view showing a section taken along line XX of FIG. 2;

FIG. 4 is a conceptual diagram showing a state of a bush cutting operation by the bush cutter shown in FIG. 1;

FIG. 5 is a side view showing a posture in which the rotary blade is inclined with respect to the ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush cutter 3 Rotary blade 31 Rotary body 32 Blade 32b Protrusion 32c End 32e Blade 32f Blade

Claims (3)

[Claims] 1. A rotary blade for a brush cutter, which is used for a brush cutter for weeding and is rotated by a driving force transmitted from a power source, the rotating body being rotated by a driving force from the power source, A blade mounted at a position where a protruding end extends from a peripheral portion of the rotating body, and having a protruding end bent at a predetermined angle with respect to the rotating body. . 2. The rotary blade for a brush cutter according to claim 1, wherein the blade has a distal end, which is opposed to the protruding end, bent at a predetermined angle with respect to the rotating body. 3. The rotary blade for a brush cutter according to claim 1, wherein the blade has a cutting edge formed in a posture facing the rotating direction of the rotating body.