JP3457588B2 - Tip saw - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip saw for cutting off weeds in a field or a field.

[0002]

2. Description of the Related Art Since the disk body of a conventionally known tip saw for a brush cutter has a horizontal surface, weeds to be mowed during the horizontal rotation of the brush fell down on the tip saw and come to the rotary shaft. We had to get rid of it by interrupting the mowing work often, and in the mowing work on the ridge, weeds felled from the ridge surface to the paddy field and covered the water surface. It became entangled in rice and caused pests.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an epoch-making tip saw that eliminates the structural defects of the conventional tip saw.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, in a tip saw in which a disc-shaped whole has a shaft hole portion as a maximum bottom portion and a loose arcuate curved surface is formed to extend to the outer peripheral edge portion, parallel to the outer peripheral edge portion of the disc body. Circular folds are provided at appropriate intervals toward the axial hole, or linear folds are provided at appropriate intervals from the outer peripheral edge of the disk toward the axial hole. Is.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Now, when the cutting operation is performed using the tip saw having the above-mentioned structure, the grass mowed by the horizontal rotation of the disk body is pushed continuously to the grass after it is mowed. It falls down and tries to entangle around the rotating shaft,
Since the rotation axis of the disk body is located below the position of the blade portion on the outer circumference of the disk body, the grass to be wound up comes into contact with the blade portion again and is shaken off.

Even if the mowed grass is wound around the rotary shaft of the disk body, one end of the grass to be wound up is always higher than the rotary shaft at the bottom, and therefore the rotary shaft is It will be wound diagonally. Therefore, this type of diagonal winding is easier to loosen, unlike the conventional tip saw that winds at a right angle. And it will be shaken off quickly.

When the grass entangled with the disk body is scattered by centrifugal force, it collides with the disk body itself having an arcuate curved surface and is flipped up. However, a large number of folds are stepped on the arcuate curved surface. By providing the grass, the grass will be prevented from slipping against the disk body, so that the bounce effect will be increased.

Further, at the time of mowing work on the ridge in the field, due to this flipping effect, the grass is flipped up in the diagonal direction of the ridge and does not fall in the direction of the paddy field.

Further, since the blade surface of the disk body is located at an angle above the cutting surface, contact with foreign matter such as pebbles is eliminated, and the disk can be safely rotated.

[0010]

Embodiment 1 is a disk body having a large number of blades 2 formed on the outer peripheral edge thereof, and a cemented carbide tip 3 is fixed to the blades.

A shaft hole 4 into which a rotary shaft is inserted and fixed is provided at the center of the disk body 1.

The disc body 1 having such a structure is formed in a gentle arcuate surface or an arcuate curved surface with the shaft hole 4 portion as the maximum bottom portion toward the outer peripheral edge portion. Therefore, the periphery of the central shaft hole 4 is not a flat dish-shaped surface. (Figs. 1 and 2)

Reference numeral 5 designates a plurality of circular folds provided in parallel with the outer peripheral edge of the disc body 1 at appropriate intervals toward the axial hole 4 and the folds have the arcuate curved surface. Body 1
To form a step. (Figs. 3 and 4)

Reference numeral 6 denotes a plurality of folds linearly provided toward the shaft hole 4 with a proper distance from the outer peripheral edge of the disc 1 and the folds are formed into the arcuate curved face. To form a radial step. (Fig. 5, Fig. 6, Fig. 7)

Reference numeral 7 is a rotary shaft portion to which the disc body 1 is attached, and 8 is a handle body.

[0016]

Since the present invention is a tip saw having the above-mentioned structure, the following effects can be exhibited.

Even if the grass mowed by the horizontal rotation of the disk body is pushed down and tries to entangle and wind around the rotary shaft, just before that, the grass comes into contact with the blade portion again and is reliably shaken off and jumped.

The grass entangled in the disk body has a large number of folds formed on the arcuate curved surface of the disk body before being scattered by the centrifugal force, so that the grass that collides with the arcuate curved surface is slippery. It can be used as a stop to increase the jumping effect.

[Brief description of drawings]

FIG. 1 is a front view of a basic tip saw body.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a front view of an embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a front view of another embodiment of the present invention.

FIG. 6 is a sectional view taken along line C-C of FIG.

FIG. 7 is a cross-sectional view taken along the line 5D-D of FIG.

FIG. 8 is a cross-sectional view of a main part showing a state of attachment to a rotating shaft part.

[Explanation of symbols]

1 Bow-shaped curved disk 4 shaft holes 5 Folds 6 folds 7 Rotating shaft

Claims (2)

(57) [Claims] 1. A tip saw in which a disc body has a shaft hole portion as a maximum bottom portion and is formed into a gentle arcuate curved surface extending to an outer peripheral edge portion, and a plurality of folds are formed in parallel with the outer peripheral edge portion of the disc body at appropriate intervals. A tip saw provided facing the shaft hole. 2. A tip saw in which a disc body is formed with a shaft hole portion as a maximum bottom portion to form a gentle arcuate curved surface toward the outer peripheral edge portion, and a straight line is formed from the outer peripheral edge portion of the disc body toward the shaft hole portion at an appropriate interval. A saw with multiple folds.