JPH0591814A - Cutting blade structure of bush cutter - Google Patents

Abstract

PURPOSE:To obtain the subject apparatus capable of preventing cut grass from entering a rotating part, facilitating operation and reducing cost without requiring a cover seat by curving the shape of a cutting blade in a bush cutter upward, providing a dishlike shape and forming grooves extending in the radial direction in the surface of the cutting blade. CONSTITUTION:In a bush cutter equipped with an engine 12 attached to the rear end of a body cylinder 10 holdable by hands and a cutting blade head 14 installed in the front, a main shaft 18 is pivoted in the interior of a head cylinder 16 constructing the cutting blade head 14 and a driving disk 22 and a pushing disk 24 are fitted to the main shaft 18. The cutting blade 20 is sandwiched with the driving disk 22 and the pushing disk 24 and a bolt 26 is used to tighten and fix the pushing disk 24 to the side of the driving disk 22. Power of the engine 12 is transmitted with a driving shaft 30 passing through the interior of the body cylinder 10 to the main shaft 18 and the cutting blade 20 is curved upward and formed into a dishlike shape. Grooves 32 extending in the radial direction are formed in the surface of the cutting blade 20 to prevent cut grass from entering the rotating part and facilitate operation of the bush cutter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade structure for a brush cutter.

[0002]

2. Description of the Related Art There are various types of cutting blades for a brush cutter, such as a round blade and a polygonal blade, all of which have a straight plate shape in the radial direction.

[0003]

Therefore, depending on the angle of action with respect to the ground, the cutting blade may dig into the ground and damage the blade, or the operator himself may be in danger.
In addition, if the cutting blade is straight, the cutting point and the cutting blade surface are aligned, so the cut grass is easy to enter (grass bite) into the rotary part through the gap between the main body side cover member and smooth There was a case that hindered the rotation. If there is grass biting, complicated work such as removing the cutting blade must be performed to remove it. The present invention solves these problems by bending the shape of the cutting blade upward to form a dish.

[0004]

SUMMARY OF THE INVENTION Under the above problems, the present invention provides a mowing blade for a bush cutter, wherein the shape of the blade is curved upward to form a dish. Provide a blade structure.

[0005]

By using the above means, the curved portion of the curve can be grounded for the work, so that the work is easy and the cutting blade does not bite into the ground. Further, since the cutting point of the cutting blade is located at a position much higher than the central portion of the cutting blade, grass cutting is reduced.

[0006]

EXAMPLE FIG. 5 is a perspective view of a brush cutter, but the structure of the brush cutter itself is the same as the conventional one. That is, the engine 12 is attached to the rear end of the main body cylinder 10 that can be held by hand, and the cutting blade head 14 is attached to the front part.

FIG. 3 is a sectional view of the cutting head 14,
A main shaft 18 is axially supported inside a head cylinder 16 which constitutes the cutting blade head 14, and a cutting blade 20 is mounted on the main shaft 18. That is, the drive plate 22 and the pressing plate 24 are fitted to the main shaft 18, the cutting blade 20 is sandwiched between the drive plate 22 and the pressing plate 24, and the pressing plate 24 is fastened to the drive plate 22 side with the bolt 26. Fix it. The power of the engine 12 is transmitted to the main shaft 18 by the drive shaft 30 passing through the inside of the main body cylinder 10. In addition, although not shown in the drawings, a cover seat that can be fastened by a bolt 26 or the like may be provided below the pressing plate 24.

FIG. 1 is a perspective view of a cutting blade 20 as a round blade, and FIG. 4 is a perspective view of a cutting blade 20 as a double blade dedicated to mowing. In the present invention, these cutting blades 20 are moved upward. It is curved to form a dish. The degree of bending may be appropriate, but the condition is that the dish should have the highest outer peripheral edge. Further, the cutting blade 20 having a plate-like shape as described above is not limited to the above-mentioned round blade and two-blade blade, and is applicable to all types and shapes.

When such a cutting blade 20 is attached and a mowing operation is performed, the curved portion of the cutting blade 20 can be grounded to the ground for the operation. Therefore, the rounded portion serves as a guide and the grass can be mowed at a constant height (lower than the conventional height), and the cutting edge does not cut into the ground (GL). In this respect, in the conventional one, the cover seat in the center was moved against the ground, but with this, the length of the grass to be cut changes with only a slight inclination, and it also bites into the ground. .

FIG. 2 is a perspective view showing another embodiment of the cutting blade 20. In this example, a groove 32 extending in the radial direction on the cutting blade 20 is shown.
Is formed. Due to the presence of the groove 32, an upward wind is generated on the upper surface of the cutting blade 20, and the cut grass is scattered upward, so that the grass is less likely to be bitten. In this sense, the heights of the wall surfaces on both sides of the groove 32 may be changed (the rear side in the rotation direction is increased).

[0011]

Since the present invention is as described above, the following effects can be expected. a) Since the cutting operation can be performed while the curved portion of the curved cutting blade is grounded on the ground, anyone can easily and easily cut grass, and the length of grass can be cut low. b) Since the cutting property of the cutting blade is improved, the sharpness of the cutting edge is not required as much as in the past, and the life is long. c) Since the cutting blade does not cut into the ground, it is safe and there is little pain in the cutting blade. d) Since the cutting point rises considerably above the center of the cutting blade,
The grass that has been cut also scatters upward, and there is less chance of grass biting into the head through the gap between the head cylinder and the cutting blade. In addition,
At this time, if a groove extending in the radial direction is formed on the cutting blade,
Winds are generated by this groove, and the grass is scattered further upward to further reduce the situation of grass biting. e) Since a cover seat or the like for holding the cutting blade at a constant height is not always necessary, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a cutting blade showing an embodiment of the present invention.

FIG. 2 is a perspective view of a cutting blade showing another embodiment of the present invention.

FIG. 3 is a sectional view of a head showing an embodiment of the present invention.

FIG. 4 is a perspective view of a cutting blade showing another embodiment of the present invention.

FIG. 5 is a perspective view of a brush cutter.

[Explanation of symbols]

 20 cutting blade 32 groove

Claims (2)

[Claims] 1. A cutting blade structure for a brush cutter, wherein the cutting blade (20) has a dish shape by bending the shape of the cutting blade (20) upward. 2. A cutting blade structure for a brush cutter, wherein a groove (32) extending in a radial direction is formed on a surface of the cutting blade (20) according to claim 1.