JPH0672319U - Tip saw for brush cutter - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the tip blade is worn or chipped, the sharpness of the tip saw is unlikely to decrease, and shrubs, etc. can be cut,
To provide a tip saw for a brush cutter that is easy to manufacture. [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 blade, and the blade 3a of the tip 3 is formed so as to face the saw blade 1 radially outward. Further, flanks 3b of each chip 3 are alternately formed toward the upper surface side and the lower surface side of the saw blade 1, and the upper surface of the chip 3 having a blade 3a formed on at least the upper surface side of the saw blade 1 is protruded, The lower surface of the chip 3 having the blade 3a formed on the lower surface side of the body 1 is projected. [Effect] Even if the blade is worn or chipped in the direction of rotation, not all of the blade is lost, and the sharpness is maintained by the remaining portion of the blade. Further, the blade of the tip can be formed by forming only the flank. The blade of each tip has the same structure as that provided with a so-called clam, and can cut a relatively hard shrub.

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. Examples of such a tip saw for a brush cutter include those shown in the plan view of FIG. 7 and the partially enlarged view of FIG. 6 (a).

As shown in FIG. 7, this tip saw has a large number of convex tip mounting portions 24 and gallets 22 on the periphery of a saw blade 21, and the tip mounting portion 24 has a rotation direction indicated by an arrow 26. A recess 25 is formed toward the side. As shown in FIG. 6A, a chip 23 is attached to the recess 25, and a blade 23a is formed at the tip of the chip 23. Further, in this tip saw, as shown in FIG. 6A, the blade 23 a of the tip 23 is formed on the front side in the rotation direction of the saw blade 21. Then, as shown in FIG. 7, the ridge line 24a on the rotation direction side of the chip 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 rotates about the rotation center. Since it extends in the direction opposite to the direction, the gullet 22 forms a relatively deep recess. Therefore, 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 of the tip 23 is substantially perpendicular to the rotation direction indicated by the arrow 26, as shown in FIG. 6 (b), the blade 23a is worn by a relatively short time. There is a problem that it does. Further, when a small stone hits the blade 23a of the tip 23, the entire blade 23a is damaged as shown in FIG. 6 (c), and the sharpness of the tip saw deteriorates in a relatively short time from the start of use. There is a point. Further, in the above-mentioned conventional tip saw, since the tip 23 having the shape shown in FIG. 6 (a) has to be formed, the flank 23b and the rake face 23c have to be cut. Therefore, there is a problem that a relatively complicated process is required.

The present invention solves such a conventional problem, and an object of the present invention is to prevent the sharpness of the tip saw from being deteriorated even if the blade of the tip is worn or chipped, and to prevent shrubs and the like. It is to provide a tip saw for a brush cutter that can be mowed and is easy to manufacture.

[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. A saw blade having a flank facing the one surface of the saw blade so that the blade of each tip is positioned on the other surface side of the saw blade. It is characterized in that it is formed toward the outside in the radial direction.

Further, the blades of the chips are alternately formed on the upper surface side and the lower surface side of the saw blade, and the upper surface of the chip having the blade formed on the upper surface side of the saw blade protrudes from the upper surface of the saw blade. In addition, it is possible to add a configuration in which the lower surface of the tip having a blade formed on the lower surface side of the saw blade is projected from the lower surface of the saw blade.

[0008]

[Action]

 In the tip saw for the brush cutter having the above structure, the tip is attached to the concave portion provided at the tip of the convex tip attaching portion. The flank of the tip blade is formed towards one side of the saw blade, and thus the tip blade is formed on the side of the other side of the saw blade approximately along the circumference of the saw blade. Normally, the wear and chipping of the blade that occurs when using a tip saw is likely to occur at the part on the rotating direction side of the chip.However, even if the cutting edge wears and chips due to the shape of the blade of such a chip. The sharpness of the tip saw can be maintained by the remaining part of the blade behind it. Further, since the blade of the chip can be formed by forming only the flank as described above, the step of forming the blade of the chip is simplified.

Further, the blades of the chips are alternately formed on the upper surface side or the lower surface side of the saw blade, and the upper surface of the chip having the blade formed on the upper surface side of the saw blade protrudes from the upper surface of the saw blade, and In the configuration in which the lower surface of the tip with the blade formed on the lower surface side is projected from the lower surface of the saw blade, the blades of the tip are alternately formed at intervals wider than the thickness of the saw blade, so the blade of each tip is so-called. The configuration is the same as that provided with the clam, and it is possible to cut even a relatively hard shrub.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows a plan view of a tip saw for a brush cutter according to an embodiment of the present invention, and FIG. 2 shows 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 periphery of the saw blade 1, and a large number of gullets 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 indicated by 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. If the angle β is larger than 15 °, the cutting edge is apt to be chipped and the strength of the tip 3 is lowered. In this embodiment, the angle β is 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 to the rotation center 10 side of the saw blade 1 is on the rotation direction side from the rotation center 10 of the saw blade 1. Has been stretched to. Therefore, the gullet 2 has a gentle shape. 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. 4, the flanks 3b of each tip 3 are formed alternately toward the upper surface 1a side and the lower surface 1b side of the saw blade 1, and therefore the blade 3a of each tip 3 is on the lower surface side of the saw blade 1. Alternatively, they are alternately formed on the upper surface side. The angle α of the edge of the blade 3a of the tip 3 is preferably 25 ° to 45 °. When the angle α is out of this range, the sharpness of the tip saw is reduced. In this embodiment, this angle α is set to 35 °. Further, as shown in FIG. 3, in the tip saw of the present embodiment, the centers of the chips 3, 3 ... In the thickness direction are attached so as to coincide with the center plane of the saw blade 1 in the thickness direction. There is. As a result, the upper surface 3c and the lower surface 3d of the chip 3 are evenly projected from the upper surface 1a and the lower surface 1b of the saw blade 1, respectively. Therefore, at least the upper surface 3c of the chip 3 having the blade 3a formed on the upper surface 1a side of the saw blade 1 protrudes from the upper surface 1a of the saw blade 1, and the lower surface 3d of the chip 3 having the blade 3a formed on the lower surface 1d side of the saw blade 1. Protrudes from the lower surface 1b of the saw blade 1.

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. In many cases, it hits the edge 4a of 4 and the probability of hitting the chip 3 directly is small. Therefore, the tip saw for the brush cutter of the present embodiment is unlikely to break the tip 3.

Further, even if the blade 3a of the tip 3 before use shown in FIG. 5 (a) is worn as shown in FIG. 5 (b), the remaining blade 3a ′ should continue to cut grass etc. Can Further, even when a stone or the like hits the blade 3a of the tip 3 and the tip 3 is damaged, the tip 3 has a shape as shown in FIG. 5C, so that the blade 3a 'left can cut grass and the like continuously. be able to.

Moreover, in the tip saw for the brush cutter of the present embodiment, the blade 3a can be formed only by cutting the flank 3b of the tip 3. Therefore, as compared with the case where it is necessary to cut two sides, a flank face and a rake face, as in the case of the conventional tip (Fig. 6 (a)), the step of forming the blade 3a of the tip 3 is simplified. Moreover, it becomes easy to align the tips of the blades 3a of the chips 3.

Further, in the tip saw for the brush cutter of the present embodiment, as shown in FIGS. 1 and 3, the blades 3a of each tip 3 are alternately formed on the lower surface 1b side and the upper surface 1a side of the saw blade 1. ing . Further, as shown in FIG. 3, the lower surface 3d of the tip 3 having the blade 3a formed on the lower surface 1b side of the saw blade 1 protrudes from the lower surface 1b of the saw blade 1, and the blade is formed on the upper surface 1a side of the saw blade 1. Since the upper surface 3c of the chip 3 protrudes from the upper surface 1a of the saw blade 1, the blades 3a of the chip 3 are alternately formed at the upper and lower sides at intervals wider than the thickness of the saw blade 1. Therefore, the blade 3a of each tip 3 has the same effect as providing a so-called clam, and it is possible to cut a relatively hard shrub mixed with weeds.

Further, in the present embodiment, since the extension line L of the ridge line of the tip mounting portion extends from the rotation center 10 toward the rotation direction side, the weeds taken into the gullet are further transferred 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 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. 1, 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.

Further, in the present embodiment, since the blade 3a is provided toward the outer side in the radial direction of the saw blade 1, the weeds to be mowed are not wound into the galette 2 and cut, but are rotated by the blade 3a. Weeds can be cut like weeds. Therefore, the angle α (FIG. 4) of the blade edge of the blade 3a can be made sharper than in the conventional case, and sharp sharpness can be obtained even at a low rotation speed. In addition, weeds can be cut smoothly without getting entangled with 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 with respect to the weeds at any angle in any direction, so that the weeding can be performed simultaneously with the cutting.

[0021]

[Effect of device]

 In the tip saw for the brush cutter according to the present invention, the flank of the tip blade is formed toward one side of the saw blade, and the tip blade is located on the other side of the saw blade in the radial outside of the saw blade. Since it is formed toward the tip, even if the blade is worn or chipped on the rotation side of the tip, all of the blade is not lost, and the sharpness of the tip saw can be maintained by the remaining portion of the blade. Further, since the tip blade can be formed by forming only the flank as described above, the step of forming the tip blade is simplified.

Therefore, it is possible to inexpensively supply a tip saw having a high sharpness.

In addition, the blade of each tip is provided with a so-called clam by alternately forming the blade of each tip on the lower surface side or the upper surface side of the saw blade and projecting the upper and lower surfaces of the chip from the upper and lower surfaces of the saw blade. The configuration is similar to the above, and it is possible to cut a relatively hard shrub.

Therefore, even when the shrubs are mixed with the weeds and grow, the mowing can be performed without lowering the sharpness.

[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.

5A is an enlarged perspective view of a tip of the tip saw for the brush cutter shown in FIG. 1, and FIG. 5B is an enlarged perspective view of a worn tip.
FIG. 6C is an enlarged perspective view of a chip having a chip.

FIG. 6A is an enlarged perspective view of a tip of a conventional brush cutter tip saw, and FIG. 6B is an enlarged perspective view of a worn tip.
FIG. 6C is an enlarged perspective view of a chip having a chip.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Saw blade 1a ... Upper surface 1b ... Lower surface 2 ... Galette 3 ... Tip 3a ... Blade 3b ... Flank surface 3c ... Upper surface 3d ... Lower surface 4 ... Chip mounting portion 5 ... Recessed portion

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 mounting portion, a concave portion provided at a tip end portion of each tip mounting portion, and a large number of chips attached to each concave portion. By forming the flank of the blade toward the one surface side of the saw blade, the blade of each tip is formed on the other surface side of the saw blade toward the outer side in the radial direction of the saw blade. This is a tip saw for brush cutters. 2. The blade of each of the chips is alternately formed on the upper surface side and the lower surface side of the saw blade, and the upper surface of the chip having the blade formed on the upper surface side of the saw blade protrudes from the upper surface of the saw blade. The tip saw for a brush cutter according to claim 1, wherein the lower surface of the tip having a blade formed on the lower surface side of the saw blade is projected from the lower surface of the saw blade.