JPS6310657Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a cutting blade for use in a brush cutter A as shown in Fig. 1, which is used for cutting weeds in ridges, banks, etc., undergrowth in mountain forests, cutting bamboo grass, etc. This is an invention related to a tip saw in which a tip such as a tungsten carbide tip is attached to the periphery of a plate-shaped saw blade.

As shown in FIGS. 5 and 6, in the conventional chip saw, a chip 3' having a thickness t considerably larger than the thickness T of the saw blade 1 is brazed to the peripheral edge of the saw blade, and the chip can be removed from both the front and back sides of the saw blade. Usually, some parts of the image stand out.

Further, the tip thereof is formed to protrude beyond the outer peripheral edge 1' of the saw blade 1, as shown in FIG.

By the way, when a brush cutter is in use, there is a very high possibility that the cutting blade will hit something other than the object to be cut, such as stones or gravel.
Therefore, in the conventional tip saw, the tip 3' protrudes from the surface of the saw blade 1, especially since the tip protrudes from the lower surface of the saw blade 1 facing the ground.
There was a drawback that stones and gravel could directly hit the chips, causing chipping or cracking, resulting in damage.

Therefore, the present invention prevents the tip from protruding from the lower surface of the saw blade 1, thereby avoiding the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 2 and 3 are plan views of a tip saw for a brush cutter according to the present invention, in which a large number of gullets 2, 2 are formed on the peripheral edge of a disc-shaped saw blade 1, and a large number of gullets 2, 2 are formed between the gullet parts 2, 2. A cutting blade 4 is formed by brazing chips 3, 3 to the protruding portion.

As shown in FIG. 4, the lower surface of the tip 3 is positioned inward so that it does not protrude from the lower surface of the saw blade 1 (in the illustrated example, the lower surface of the saw blade and the lower surface of the tip are flush with each other), and the upper surface causes a part of tip 3 to protrude.

That is, in order to braze the tip 3, a part of the saw blade to which the tip 3 is to be attached is cut out to form a stepped portion 5.
The chip 3 is brazed to the stepped portion 5. At this time, the tip 3 is thick as in the conventional case, and the tip is made to protrude from both the front and back sides of the saw blade. After brazing, the lower surface is polished and the protruding portion of the chip 3 is removed.

As shown in FIG. 4, the tip 3 may be flush with the lower surface of the saw blade 1 so that it does not protrude at least, or it may be cut further inward.

On the other hand, the upper surface of the tip 3 is preferably ground diagonally so that the joint portion matches the thickness of the saw blade 1, and the cutting edge 3a projects upward, so that the cutting edge angle α is made more acute.

On the other hand, it is preferable that the joint portion of the upper surface of the tip 3 is made to match the thickness of the saw blade 1, and the cutting edge angle α is formed to be more acute.

The outer end of the tip 3 is ground flush with the outer peripheral edge 1' of the saw blade 1, as shown in FIG. 3, so that it does not protrude significantly.

As shown in FIG. 1, when the tip saw is attached to the brush cutter A and used, weeds and the like first enter the gullet 2 and are cut by the tip 3.

In this case, according to the tip saw of the present invention, with the tip saw having a cutting blade, pebbles on the ground do not hit only the tip, and the possibility of the tip being damaged can be reduced as much as possible.
Weeds and the like introduced into the gullet 2 can be sharply and reliably cut with the tip of the tip protruding from the saw blade.

Then, as in the embodiment, if the joint part of the tip 3 is made to match the thickness of the saw blade and the cutting edge is made to protrude upward to form the cutting edge angle α to be more acute, it is possible to cut more sharply.

Note that it is also possible to make the tip 3 itself thinner so that it does not protrude from both the front and back sides of the saw blade 1 to prevent stones, etc. from hitting the tip itself, but in that case, the strength of the tip 3 itself, especially wax Although the strength of the attached portion is inferior, according to the present invention, the strength of the chip itself and its attached portion can be increased, making it stronger overall.

[Brief explanation of the drawing]

Figures 1 to 4 of the attached drawings show an embodiment of the tipsaw for a brush cutter according to the present invention. 3 is an enlarged view of only a portion of FIG. 2, FIG. 4 is a plan view of only a portion, FIGS. 5 and 6 are an example of a conventional chipsaw, and FIG. FIG. 6 is a plan view thereof. 1...Saw blade, 1'...Outer rim, 2...Garlet,
3... Chip, 3a... Blade tip, 4... Cutting blade, 5
...Danbe.

Claims (1)

[Claims for Utility Model Registration] 1. In a chipsaw in which a large number of chips 3, which are cutting blades, are attached to the peripheral edge of a disc-shaped saw blade 1, the lower surface of the chips 3 is inward so as not to protrude from the lower surface of the saw blade 1. and the upper surface is the saw blade 1.
A tipsaw for a brush cutter, characterized by a tip that protrudes beyond the top surface. 2. The chip saw for a brush cutter according to claim 1, wherein the joint part of the chip 3 is made to match the thickness of the saw blade 1, the cutting edge is made to protrude upward, and the cutting edge angle α is formed at an acute angle.