JPH06315311A - Rotary blade for grass mower - Google Patents

Abstract

PURPOSE:To improve the sharpness of a chip and prevent the damage and the breaking-off of cutting edges by positioning the base of a scooping body at a specific depth, wherein the scooping body is attached on the periphery of a rotating blade disk. CONSTITUTION:A blade table 2 is formed by attaching uniformly spaced scooping bodies 3 at the periphery of a rotating disk 1. A hollow groove 5 facing the scooping body 3 is formed on the blade table 2. The inner base 6 of the groove 5 is positioned on or inside of the circular line formed by linking the bases 4 of the scooping bodies 3. A blade of an ultrahard chip is engaged in the groove 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade for a brush cutter.

[0002]

2. Description of the Related Art Conventionally, in a rotary blade for a brush cutter, a cemented carbide tip projecting from a peripheral portion of a rotary disc body and fixedly welded at equal intervals connects bases of a rake portion with which the base portion is in contact. Since it was located on the outer side of the circumference line, when a large impact is applied to the blade of the rotating disc during the brush cutting operation, the blade base will be bent or twisted in the direction perpendicular to the rotation direction. By the way, the cemented carbide chip lacking in toughness could not follow the deformation due to it, and it was broken or chipped.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate such drawbacks of conventional rotary blades and to provide rotary blades with high practicality.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, in a scooping portion and a blade base portion formed around a disk body, a base of each scooping portion is attached to a blade base portion facing the scooping portion from a cemented carbide tip. The blade body is formed to have the same depth as or shallower than the base of the recessed groove portion.

[0005]

When the brush cutter equipped with the rotary blade of the present invention is used, even if foreign matter collides with the blade body on the rotary disc during operation and impact is applied, the base of the blade body is located inside the concave groove portion. Since it deeply enters the part and is fixed, the mowing work by the normal rotation can be continued without being affected by the foreign matter.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1 is a rotating disk body, 2 ... Is a blade base portion provided with rake portions 3 at the periphery of the disk body 1 at equal intervals, and 4 is a base of the rake portion 3.

Reference numeral 5 is a concave groove portion provided on the blade base portion 2 facing the rake portion 3, and the base of the inner deep portion 6 of the concave groove portion is on the circumferential line a connecting the base 4 of the rake portion 3. Alternatively, it is deeply formed so as to be located inward of this.

The base 4 of the scoop portion 3 is replaced with the concave groove portion 5
It is located at the same depth as the base of or is formed shallower than this.

Reference numeral 7 denotes a blade body made of a cemented carbide tip which is fitted and fixed to the inner groove portion 6 of the concave groove portion 5, and a base portion 8 of the blade body is fitted to the inner rear portion 6. Reference numeral 9 denotes a rake face of the blade body 7 facing the rake portion 3.

The shorter the length between the circumferential line b connecting the tip of the blade 7 and the circumferential line a connecting the base 4 of the scoop portion 3, the shorter the blade 7 of the cemented carbide tip. The impact resistance is high, but it is limited.

[0011]

As described above, according to the present invention, since the base portion of the cemented carbide tip is fixed to the body portion of the disk body having high rigidity, it becomes extremely strong against impact by foreign matter, and the cutting is performed. It becomes possible to improve the sharpness of the tip by reducing the resistance of the tip to the cutting object to be paid off, and because the weight of the whole tip does not cause deflection while vibrating during rotation, the rotating action is always It is carried out smoothly and the metal fatigue is reduced. Therefore, the blade body of the cemented carbide tip is not damaged or missing, and the good condition of the rotary blade can be maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is an overall front view

FIG. 2 is an enlarged front view of a main part.

[Explanation of symbols]

 2 Blade base part 3 Rake part 4 Base of rake part 5 Recessed groove part 6 Inner back part of recessed groove part 7 Blade body 8 Base part of blade body

Claims (2)

[Claims] 1. A rake portion and a blade base portion that are formed around a disk body, in which a base body of each rake portion is attached to the blade base portion facing the rake portion, and a blade body formed of a cemented carbide tip is fitted into the recess. A rotary blade for a brush cutter, which is formed to have the same depth as or shallower than the base of the groove. 2. A rake portion and a blade base portion which are formed around a disk body, and a concave groove portion is formed in the blade base portion facing the rake portion, and an inner back portion of the groove line connects the base of the rake portion or A rotary blade for a brush cutter, which is formed so as to be located inward of this, and in which a blade body made of a cemented carbide tip and a base portion thereof are fitted and fixed to the concave groove portion and an inner depth portion thereof.