JPH0624902U - Tip saw for brush cutter - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tip saw for a brush cutter, which is not easily flipped upward even when hit by pebbles and the like, and the sharpness of the tip saw is not easily deteriorated. [Structure] A large number of concave gullets 2 are provided on the peripheral edge of a disk-shaped saw blade 1, and a large number of convex chip mounting parts 4 are formed between them. Recessed portion 5 provided at the tip of the chip mounting portion 4
The tip 3 is attached to the, and the blade 3a of the tip 3 is formed along the circumference of the saw blade 1. Further, the ridge line 4a of the chip mounting portion 4
The shape of the gullet 2 is formed so that the extension line L of the gullet 2 extends from the rotation center 10 of the saw blade 1 toward the rotation direction side. As a result, the weeds that have entered the gullet 2 are guided to the blade 3a of the tip 3, and the blade 3a cuts the weeds guided from the gullet 2 while rotating them.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tip saw for a brush cutter, which is used by being attached to a brush cutter for cutting weeds, bamboos, etc. that grow on ridges, banks, forests and the like.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, a brush cutter is often used for cutting weeds, bamboo grass, etc. that grow on ridges, banks, and forests. This brush cutter uses a tip saw with a large number of tips on the periphery of the saw blade. As a tip saw for such a brush cutter, for example, the one described in Japanese Utility Model Publication No. 63-10657 can be mentioned. FIG. 6 shows a plan view of the tip saw for the brush cutter described in this publication, and FIG. 7 shows a side view thereof.

This tip saw has a large number of convex tip attachment portions 24 and a garret 22 on the periphery of the saw blade 21, and is used by rotating it in the direction shown by arrow 26. Further, a step portion 25 is formed on the ridge line on the rotation direction side of the chip mounting portion 24, and the chip 23 is attached to the step portion 25. The blade 23a of the tip 23 is oriented in the direction of rotation indicated by the arrow 26. Further, as shown in the side view of FIG. 7, the blade 23a of the tip 23 projects only on the upper surface of the saw blade 21, and the lower surface of the blade 23a and the lower surface of the saw blade 21 coincide with each other. Further, in this tip saw, the ridge line 24a on the rotation direction side of the tip mounting portion 24, that is, the extension line L to the rotation center side of the ridge line on the side opposite to the rotation direction side of the gullet 22 is opposite to the rotation direction of the rotation center. Since it extends to the side, the gullet 22 forms a relatively deep recess. Therefore, the weeds and the like to be cut are taken into the gullet 22 by the rotation of the saw blade 21 and cut by the blade 23a.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional tip saw, since the blade 23a is projected on the upper surface of the saw blade 21, when a small stone hits the tip saw, it is easily blown upward, and not only the user of the brush cutter but also the surrounding area. People are also at risk. Further, since the blade 23a of the tip 23 is oriented in the rotation direction shown by the arrow 26, there is a problem that the blade 23a is easily damaged by pebbles and the sharpness of the tip saw is easily deteriorated. Furthermore, when a conventional tip saw is used, the grass is caught in the gullet 22 and cut, so that the grass falls in various directions. Therefore, there is a problem that it is not possible to mow the grass while pulling it in one direction.

The present invention solves such a conventional problem, and an object of the present invention is to prevent the tip saw from being easily flipped up even if pebbles or the like are hit, and the sharpness of the tip saw is not easily deteriorated. It is to provide a tip saw for a brush cutter that can perform mowing while moving.

[0006]

[Means for Solving the Problems]

 A tip saw for a brush cutter according to the present invention has a disk-shaped saw blade that rotates in a plane substantially parallel to the ground, a large number of concave gullets formed on the peripheral edge of the saw blade, and these galleys. Chip cutter for a brush cutter, which has a large number of convex tip mounting portions provided between the blades, a concave portion provided at the tip of each tip mounting portion, and a large number of chips attached to the concave portions. In the psaw, the blade of the tip is formed toward the outer side in the radial direction of the saw blade, and the extension line of the ridge line on the rotation direction side in the tip mounting portion to the rotation center side of the saw blade is It is characterized in that it extends in the direction of rotation from the center of rotation of the saw blade.

Further, a configuration is added in which the upper surface of each of the chips is aligned with the upper surface of the saw blade, and the concave surface of the blade of each of the chips is formed toward the lower side of the rotating surface of the saw blade. be able to.

[0008]

[Action]

 With the tip saw for a brush cutter having the above structure, a recess is provided at the tip of the tip mounting part, and the tip is attached to this recess, so even if the tip saw rotates and hits a pebbles, the pebbles will not be on the tip. It does not hit directly, but hits the part on the rotation side of the chip mounting part. Therefore, in the tip saw of the present invention, the breakage of the tip is very unlikely to occur.

Further, normally, the chipping of the blade that occurs when the tip saw is used is likely to occur at the portion on the side of the tip in the rotation direction. In view of this point, in the tip saw of the present invention, since the blade of each tip is provided toward the outer side in the radial direction of the saw blade, even if the portion on the rotational direction side of the blade is slightly absent, the remaining portion You can mow grass with. In addition, since the extension line to the rotation center side of the ridge line on the rotation direction side of the tip mounting part, that is, the ridge line on the side opposite to the rotation direction side of the gullet extends to the rotation direction side from the rotation center, It forms a gentler recess than the one. Therefore, the weeds taken into the gullet are further guided to the tip of the tip mounting portion and are mowed by the blade formed toward the outer side in the radial direction of the saw blade. Furthermore, by providing a blade on the outer periphery of the saw blade, weeds can be cut by rotating the weeds instead of winding the weeds to be cut into the gullet as in the past, so that it is sharper. The sharpness is obtained, and it is possible to mow while pulling the grass in one direction.

Further, in the tip saw for the brush cutter of the present invention, since the upper surface of each tip is attached so as to match the upper surface of the saw blade, the pebbles that hit the tip saw are blown off by the upper surface of the saw blade. There is no such thing. At the same time, the bald surface of the blade of each tip is formed toward the lower side of the rotating surface, so the pebbles that hit the lower surface of the tip saw are thrown toward the ground and then upward. There is no such thing.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a plan view of a tip saw for a brush cutter according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. The tip saw for a brush cutter of this embodiment has a disk-shaped saw blade 1, a large number of concave gullets 2 formed on the peripheral edge of the saw blade 1, and a large number of gallets 2 provided between these gullets 2. It has a convex chip mounting portion 4. The tip saw of this embodiment is attached to the rotary shaft of the brush cutter by the attachment hole 9 at the center of the saw blade 1, and rotates in the direction shown by the arrow 6.

Further, as shown in FIG. 2, in the present embodiment, a recess 5 is provided at the tip of the chip mounting portion 4, and the chip 3 is mounted in the recess 5 by brazing or the like. Further, the chip 3 has a blade 3a formed toward the outer side in the radial direction of the saw blade 1. The angle β formed by the ridgeline of the blade 3a and the outer circumference circle 8 of the saw blade 1 may be in the range of 0 ° to 15 °. The sharper the angle β, the better the sharpness. In this embodiment, the angle β is set to 15 °. Further, as shown in FIG. 1, an extension line L of the ridgeline 4a on the rotation direction side of the tip mounting portion 4 toward the rotation center 10 side of the saw blade 1 is located on the rotation direction side of the rotation center 10 of the saw blade 1. It is stretched. Therefore, the gullet 2 has a gentler shape than the conventional tip saw. With this configuration, the weeds that have entered the gullet 2 are guided to the blade 3a of the tip 3 without staying in the gullet 2.

FIG. 3 shows an A-A ′ arrow view of FIG. 2, and FIG. 4 shows a B-B ′ arrow view of FIG. As shown in FIG. 3, in the tip saw of this embodiment, the upper surfaces of the chips 3, 3 ... Are attached so as to coincide with the upper surface of the saw blade 1. Further, as shown in FIG. 4, the burr surface 3b of the blade 3a of the tip 3 is formed toward the lower side of the rotation surface of the saw blade 1, and the angle α of the blade edge is preferably 25 ° to 45 °. In this embodiment, this angle α is set to 35 °.

In the tip saw for the brush cutter of the present embodiment, the tip 3 is attached to the recess 5 at the tip of the tip attaching portion 4, so even if the tip 3 hits the pebbles by rotation, the pebbles are attached to the tip attaching portion. It hits the portion on the rotation direction side of 4 and does not directly hit the tip 3. Therefore, the tip saw for the brush cutter of the present embodiment is very unlikely to break the tip 3. Further, even if the tip 3 is damaged, the chipping of the blade 3a occurs at the portion on the rotational direction side of the blade 3a, so that grass or the like can be cut by the remaining portion of the blade 3a.

Further, since the blade 3a is provided along the circumferential direction of the saw blade 1 in this embodiment, the weeds to be mowed are not wound into the galette 2 and cut, but are rotated by the blades 3a. It can be cut as if cut out. Therefore, the angle α (FIG. 4) of the blade edge of the blade 3a can be made sharper than in the conventional case, and a sharp sharpness can be obtained even at a low rotation speed. In addition, weeds can be cut smoothly without entanglement of weeds, and the fuel efficiency of the brush cutter can be reduced. Further, there is an advantage that the blade 3a after use can be easily re-polished. Further, since the blade 3a is provided on the outer periphery, the tip saw can be used against weeds at any angle and in any direction, so that weeding and grass cutting can be performed at the same time.

Further, in the present embodiment, since the extension line L of the ridgeline of the tip mounting portion extends from the rotation center 10 toward the rotation direction side, the weeds taken into the gallet are further fed to the tip mounting portion 4. The blade 3a is guided to the tip and cut by the blade 3a formed along the circumferential direction of the outer peripheral portion of the saw blade 1.

Further, in the tip saw for a brush cutter of the present invention, since the upper surface of each tip 3 is attached so as to match the upper surface of the saw blade 1, pebbles and the like are not thrown upward. In addition, since the barbed surface 3b of the blade of each tip 3 is formed toward the lower side of the rotating surface, the pebbles that hit the lower surface of the tip saw must be blasted toward the ground and blasted upward. There is no. Therefore, even when cutting short grass, the pebbles and the like are hardly thrown away by the tip saw, and the cutting work can be performed safely.

Further, in this embodiment, since the chip 3 is mounted in the recess 5 at the tip of the chip mounting portion 4, the brazing area can be made larger than in the conventional case. Therefore, the saw blade 1 can be made thin, and the weight of the tip saw can be reduced. Further, as shown in FIG. 5, by providing the holes 7, 7 ... In the saw blade 1, the weight of the tip saw can be further reduced, and the tip saw having an excellent design can be obtained.

[0019]

[Effect of device]

 In the tip saw for the brush cutter according to the present invention, the tip is attached to the recessed portion of the tip attaching portion, so that it is possible to prevent the pebbles from directly hitting the tip by the rotation. Moreover, since the blade is formed along the circumferential direction of the saw blade, even if a slight chipping of the blade occurs, the sharpness of the tip saw is not deteriorated.

Further, in the present invention, the gullet is formed with a gentle concave portion as compared with the conventional one, so that the weeds are easily guided from the gullet to the blade of the tip mounting portion and cut by cutting with the blade. Be done.

Further, in the tip saw for the brush cutter of the present invention, the upper surface of each tip is attached so as to match the upper surface of the saw blade, and the bald surface of the blade of each tip is located below the rotating surface. Since it is formed facing, the pebbles that hit the tip saw are not thrown upward, but are thrown toward the ground.

[Brief description of drawings]

FIG. 1 is a plan view of a tip saw for a brush cutter according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the tip saw for the brush cutter shown in FIG.

3 is a view on arrow A-A 'of FIG.

FIG. 4 is a view on arrow B-B ′ of FIG. 1.

FIG. 5 is a plan view of a tip saw for a brush cutter according to another embodiment of the present invention.

FIG. 6 is a partially enlarged view of a conventional tip saw for a brush cutter.

FIG. 7 is a side view of a conventional tip saw for a brush cutter.

[Explanation of symbols]

 1 ... Saw blade 2 ... Gallet 3 ... Tip 3a ... Blade 3b ... Bald surface 4 ... Chip mounting part 5 ... Concave

Claims (2)

[Scope of utility model registration request] 1. A disk-shaped saw blade that rotates in a plane substantially parallel to the ground, a large number of concave gullets formed on the peripheral edge of the saw blade, and a large number provided between these gullets. Is a tip saw for a brush cutter, comprising a convex tip attaching portion, a concave portion provided at the tip of each tip attaching portion, and a large number of tips attached to the concave portions, the blade of the tip being Is formed toward the outer side in the radial direction of the saw blade, and the extension line of the ridge line on the rotation direction side of the tip mounting portion toward the rotation center side of the saw blade is in the rotation direction from the rotation center of the saw blade. A saw for a brush cutter characterized by being extended to the side. 2. The upper surface of each tip is aligned with the upper surface of the saw blade, and the burr surface of the blade of each tip is formed toward the lower side of the rotation surface of the saw blade. The tip saw for a brush cutter according to claim 1.