JPH0555837U - Tip saw for brush cutter - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the sharpness of the tip saw of a brush cutter, and to prevent the risk of chips falling off or being damaged during the brush cutting operation. In a tip saw of a brush cutter, the cutting blade of the tip has a sharp triangular shape, and a protrusion is provided on the peripheral edge of a disk having a larger radius of rotation than the tip.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 INDUSTRIAL APPLICABILITY The present invention is a cutting blade used for weeding grasses, ridges, ditches, and other weeds in forests and forests, and is a blade for cutting grass. The present invention relates to the technology of joined tip saws.

[0002]

[Prior Art]

 Conventionally, a technique relating to a tip saw of a cutting blade used for a brush cutter is known. For example, it is like the technique described in Japanese Utility Model Publication No. 3-23055. In the prior art, as shown in FIGS. 6 and 7, a step 5a is formed on the rising front end edge of the tooth profile 5 formed on the peripheral edge of the blade plate 4, and a chip is formed on the step 5a. One side of 6 was brazed and joined.

[0003]

[Problems to be solved by the device]

 However, in the tip saw of the conventional brush cutter, although the tip had a clearance angle A of 5 to 15 degrees as shown in FIG. 7, the tip saw had a shape close to that of a rectangular parallelepiped. It was easy to receive and had poor sharpness. Also, it is difficult to carry out brazing work that provides a large joining strength while maintaining the pressing force between the joining surface of the tip and the joining surface of the blade plate, which is the base material, and during cutting work There was also the danger that the slab would fall off or be damaged by the impact force. The present invention is intended to solve the above-mentioned problems of the conventional technology.

[0004]

[Means for Solving the Problems]

 The problems to be solved by the present invention are as described above, and the means for solving the problems will be described below. That is, in the tip saw of the brush cutter, the shape of the cutting edge 3a of the tip 3 is made into a sharp triangular shape that is oriented in the rotation direction of the tooth profile 2, and the shape of a disc with a larger radius of rotation than the tip end of the tip 3 is used. The protrusion 2b is provided on the peripheral portion.

[0005]

[Action]

 Next, the operation will be described. In other words, because of the above-mentioned structure, the sharpness of the tip saw of the brush cutter is improved, and there is no risk of the tip falling off or being damaged during the work.

[0006]

【Example】

 The problems to be solved and the means for solving the present invention are as described above. Next, the specific configuration of the present invention will be described with reference to the accompanying drawings. 1 is an overall front view of a tip saw for a brush cutter of the present invention, FIG. 2 is an enlarged view showing a tip mounting portion of the present invention, FIG. 3 is an enlarged view of a tip of the present invention, and FIG. 4 is a book showing another embodiment. FIG. 5 is an enlarged view of the device of the invention, and FIG. 5 is an enlarged perspective view of the device of the invention.

1 to 5, the structure of the tip of the tip saw for a brush cutter of the present invention will be described. As shown in FIG. 1, a large number of tooth profiles 2 are provided on the peripheral edge of a blade plate 1 of the tip saw for a brush cutter of the present invention, and a tip 3 is embedded in each tooth profile 2 as shown in FIG. Since they are brazed and joined, the cutting blade 3a of the chip 3 is used for the weeding of weeds such as banks, ridges and ditches, and the forest, and the cutting of bamboo grass.

Specifically, as shown in FIG. 2, a base end portion 3b of a tip 3 made of tungsten carbide, which is a super hard material, is inserted into a recess 2a of a tooth profile 2 of a tip saw for a brush cutter, and brazing. It will be joined.

As shown in FIG. 5, the tip 3 has a cutting edge 3 a at its front part, and the shape of the cutting edge 3 a is an isosceles triangular pyramid. In the direction of rotation, the apex of the isosceles triangle is formed as a sharp blade. The rear portion is composed of a base end portion 3b for inserting into the recess 2a of the tooth profile 2, and the shape of the base end portion 3b is a rectangular parallelepiped.

Next, the shape of the tooth profile of the tip saw for a brush cutter of the present invention will be described. When enlarged, each tooth profile 2 of the brush cutter tip saw of FIG. 1 is configured as shown in FIG. 3, and each tooth profile 2 of the brush cutter tip saw has a rotation of the tooth profile 2 that is larger than the rotation radius 3r of the tip 3. The radius 2r is longer. The protrusion 2b is formed by a length longer than the turning radius 3r of the tip 3 to protect the cutting edge 3a of the tip 3 from obstacles, and even if the protrusion 2b is formed as shown in FIG. It's good.

[0011]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. First, by forming the cutting edge of the tip of a mower tip saw into a pyramidal shape with an isosceles triangular base, the resistance of the tip to the cutting grass is reduced and the sharpness is improved. is there.

Secondly, because the tooth profile of the brush cutter tip saw is provided with protrusions that are longer than the turning radius of the chip, the tip of the brush cutter tip saw is made of stone or the like in the cutting work of weeds. Protected from the obstacles of the above, the danger of chips falling off and breaking during conventional work and the dangers associated therewith has been resolved.

[Brief description of drawings]

FIG. 1 is an overall front view of a tip saw for a brush cutter of the present invention.

FIG. 2 is an enlarged view showing a tip mounting portion of the present invention.

FIG. 3 is an enlarged view of the chip of the present invention.

FIG. 4 is an enlarged view of the chip of the present invention.

FIG. 5 is an enlarged perspective view of the chip of the present invention.

FIG. 6 is an enlarged view showing a conventional chip mounting portion.

FIG. 7 is an enlarged perspective view of a conventional chip.

[Explanation of symbols]

 1 Blade Plate 2 Tooth Profile 2a Recess 2b Projection 2r Rotation Radius 3 Tip 3a Cutting Blade 3b Base End 3r Rotation Radius

Claims (1)

[Scope of utility model registration request] 1. In a tip saw of a brush cutter, a tip 3
The cutting blade 3a has a sharp triangular shape that faces the direction of rotation of the tooth profile 2, and a protrusion 2b is provided on the peripheral edge of a disk having a larger radius of rotation than the tip of the tip 3. A saw for a brush cutter.