JPH0928154A - Cutting blade for brush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide cutting blades for a brush cutter, capable of simultaneously cutting weeds without replacing the blades depending on the kind of bottom grass and weeds and further cutting the grass short and hardly broken even by contact with hard materials. SOLUTION: The cutting blades for a brush cutter are obtained by superposing rotating disk units with an interval kept therebetween, installing blades so as to enable the free rotation along the peripheral side edges of the rotating disk units in the gap between the rotating disk units and forming the blades so as to freely protrude or retreat from the peripheral side edges of the rotating disk units. Thereby, the blades protrude by centrifugal force due to the rotation of the rotating disk units and retreat when brought into contact with hard materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade for a brush cutter, which is attached to a brush cutter used for cutting off undergrowth, weeds and the like.

[0002]

2. Description of the Related Art Conventionally, in this cutting blade for a seed mower,
As shown in FIG. 5, a rotating disk body having a peripheral edge formed in a concavo-convex shape to form a blade has been generally used.

[0003]

By the way, in the conventional brush cutters equipped with the above-mentioned conventional blades for brush cutters, the types of blades must be changed depending on the types of undergrowth, weeds, etc. (nylon). Saw, 4-blade, 8-blade, saw blade, tip saw, etc.) In addition, there is a problem that it is easily damaged when it comes into contact with a hard object such as a stone or a concrete wall, and the life is shortened remarkably. The present invention has been developed in view of the above circumstances, and can be mowed simultaneously without changing the blade depending on the type of undergrowth, weeds, etc. It is hard to damage even if it comes into contact with hard objects such as stones, and cuts shortly. An object of the present invention is to provide a cutting blade for a brush cutter that can be used.

[0004]

In order to achieve the above object, according to the present invention, rotating discs are superposed with a space therebetween, and a gap between the rotating discs is provided along a peripheral side edge of the rotating discs. The blade is rotatably attached, and this blade is formed so as to project or retreat from the peripheral side edge of the rotating disk body.The blade projects due to the centrifugal force due to the rotation of the rotating disk body, stones, etc.
It is formed so that the blade retracts when it comes into contact with a hard object.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given based on the illustrated embodiment. Reference numeral 1 is a cutting blade for a brush cutter of the present invention, 2 is a rotating disk body disposed on the front surface, and 3 is a rotating disk body disposed on the back surface. The rotary disc body 2 is formed in an inverted dish shape that bulges slightly upward, and a rotary shaft insertion hole 2a is formed in the center thereof, and the rotary shaft insertion hole 2a portion and its periphery are concavely formed into a dish shape. I have it. Further, bolt holes 2b are formed along the circumferential side edge at positions that divide the circumferential direction into three equal parts, and this portion is also recessed. Rotating disk 3
Is formed to be slightly larger than the rotating disk body 2 in a smooth shape, has a large round hole 3a formed in the center thereof, and is divided into three equal parts in the circumferential direction along the circumferential side edge. Bolt hole 2
A bolt hole 3b communicating with b is bored.

Reference numeral 4 denotes a blade. The blade 4 has a mounting hole 4a formed in the base end of a rectangular metal plate. Further, both left and right edges in the longitudinal direction are notched in an arc shape, and the notches are obliquely cut to form the cutting edges 4b and 4b. The cutting edges 4b provided on the respective side edges are in opposite directions. It has a slope. A bolt insertion hole 5a is formed in the center of the attachment hole 4a of the blade 4, and a ring 5 having a thickness slightly larger than that of the blade 4 is inserted. The blade 4 is inserted through the bolt insertion holes 5a of the ring 5 into the bolts 6 inserted through the respective bolt holes 2b of the rotary disk body 2, and the bolts 6 are inserted through the respective bolt holes 3b of the rotary disk body 3 to form a disk. The nut 7 is tightly attached to the back surface of the body 3, and the rotary disc body 2 and the rotary disc body 3 are arranged so as to be overlapped with each other with a space therebetween, and the gap 8 is provided on the peripheral side edges of the rotary disc bodies 2 and 3. The blades 4 are attached rotatably around the bolts 6 via the rings 5, and three blades 4 are attached so as to project or retract from the peripheral side edges of the rotary disk bodies 2 and 3. The number of blades 4 is not limited to three, and four blades or other required number may be attached (not shown).

The cutting blade 1 for a brush cutter according to the present invention having the above structure is rotated by driving a motor 10 in a rotary body insertion hole 2a formed in the surface of a rotary disc body 2 as shown in FIG. It is connected to the rotating body 9 with a bolt and is attached to the tip of the gripping rod 11. In FIG. 3, reference numeral 12 indicates a safety guard, and 13 indicates a grip portion. When the rotating disc bodies 2 and 3 are rotated (counterclockwise) during use, the centrifugal force causes the blade 4 to rotate the rotating disc bodies 2 and 3.
3 protrudes outward from the peripheral side edge of 3 and cuts off undergrowth, weeds, etc. by the blade edge 4b. Further, when contacting a hard object such as a stone, the blade 4 rotates and retracts into the rotating disk bodies 2 and 3 to avoid a strong impact.

As described above, according to the present invention, since the blade is further rotatably attached along the peripheral side edge of the rotating disk body, the blade is projected by the centrifugal force due to the rotation of the rotating disk body and the undergrowth, the weeds and the like are cut off. When contacting a hard object such as a stone, the blade rotates and retracts to avoid impact, so there is no risk of damaging the blade. For this reason, weeds, weeds, etc. can be cut short,
It has a long blade life and is economical, and can cut thin and flexible undergrowth to thick weeds at the same time. Further, since the blade is attached to the shaft through the ring, the ring portion absorbs the energy of the shock, so that it can withstand a considerably strong shock. In addition, the cutting edge has a so-called receding angle in which the side edge of the rectangle is cut out in an arc shape, so it is possible to mow thin flexible grass without escaping outward, and the cutting edge is provided on both side edges of the rectangle. Therefore, when the cutting edge deteriorates due to long-term use, it can be easily replaced by simply turning the blade over.

[Brief description of drawings]

FIG. 1 is a partially crushed plan view.

FIG. 2 is an AA vertical sectional view showing a state in which the brush cutter is mounted on the brush cutter.

FIG. 3 is an enlarged vertical sectional view of a blade mounting portion.

FIG. 4 is a perspective view showing a state in which the brush cutter is mounted on the brush cutter.

FIG. 5 is a plan view showing an example of a conventional cutting blade for a brush cutter.

[Explanation of symbols]

 1 Mowing blade for brush cutter 2 Rotating disc body 3 Rotating disc body 4 Blade 5 Ring 6 Bolt 7 Nut 8 Gap 9 Rotating body 10 Motor 11 Gripping rod 12 Safety guard 13 Gripping part

Claims (5)

[Claims] Claims: 1. Rotating discs are superposed with a space therebetween, and a blade is rotatably attached along the peripheral side edge of the rotating discs in the gap between the rotating discs. A cutting blade for a brush cutter, which is formed so as to project or retract from the peripheral edge. 2. The cutting blade for a brush cutter according to claim 1, wherein the blade is attached to the shaft through a ring inserted in the base end portion. 3. The cutting blade for a brush cutter according to claim 2, wherein the shaft comprises a bolt tightly connected between the rotating disc bodies. 4. A mowing machine for a brush cutter according to claim 1, 2 or 3, wherein the blade is formed by notching both left and right edges of a rectangular plate in a circular arc shape and cutting the notched portion obliquely. blade. 5. The cutting blade for a brush cutter according to claim 4, wherein the cutting edges provided on the left and right side edges have inclinations in mutually opposite directions.