JPH10276531A - Edge for reaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent super-hard chips from flying away to the side of an outer peripheral direction with respect to an edge for a reaper obtained by braze- fixing the many ultra-hard chips to the outer peripheral part of a disk-like edge plate. SOLUTION: This edge for a reaper consists of the edge plate 2 forming saw edges 9 at the outer peripheral part and forming cutting parts at its corner part, and the ultra-hard chips 3 forming projecting parts extended in a lateral side direction from side parts along the edge parts of the cutting parts. The side parts of the chips 3 are made along the edge part of the cutting parts and the projecting parts are turned to be positioned on the plate face of the edge plate 2 to braze-fix.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary blade used for a power-type brush cutter.

[0002]

2. Description of the Related Art As shown in FIG. 1, a power-type mower used for mowing work or the like is provided with a rotary output of a power motor 11 to a flange portion at a tip end via a shaft disposed inside a rod 12. The blade is attached by screwing it so that the center of the blade is pressed against the lower surface of the flange. Such a brush cutter often uses a tip saw in which a number of carbide tips 14 are attached to an outer peripheral portion of a circular metal blade plate 13.

[0003]

In the case of mowing using a brush cutter, during the operation, the tip of the carbide tip frequently comes into contact with a stone rolling on the ground, In order to prevent the cemented carbide tip from falling off the blade plate due to the strong impact constantly applied to the cemented carbide part, in the case of recent ones, the cemented carbide tip was formed on the blade plate. It is common to have a configuration in which brazing is performed in a state inserted into the notched concave portion.

[0004] However, in the case where a notch recess is formed in the blade plate and brazing is performed in a state where a carbide tip is inserted into the recess, the carbide tip is fixed only at the side brazing portion. The disadvantage is that the brazing part fatigues in a short period of time due to the strong impact from the bottom surface by the stones rolled on the ground and the strong centrifugal force applied during work, causing the chips to fly. There is.

[0005] The present invention is to solve such a problem in the conventional configuration.

[0006]

According to the present invention, a number of cuts are formed in the outer periphery of a circular blade plate, and brazing is performed with the side of the carbide tip being along the side of the cut. In the fixed blade of the brush cutter, the cemented carbide tip is formed with a protruding portion that protrudes outwardly from the side thereof, thereby increasing the brazing strength and increasing the tip of the tip during operation. This is to prevent flying.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 2 to 6, a blade 1 for a brush cutter has a hole 8 for attaching to the brush cutter at the center. .. Are formed on the outer peripheral portion of the circular blade plate 2, and the notches 4 are formed at the respective corners of the tip, while the cutouts 4 are formed at the corner positions of the side portions 5 of the carbide tip 3 in the outward direction. When the carbide tip is attached to the blade plate 2, the side portion 5 is made to be along the side 6 of the cut portion 4 formed in the blade plate 2, and the protrusion 7 Is the blade plate 2
It has a schematic configuration in which it is brazed and fixed so as to cover the plate surface.

That is, the blade plate 2 has a sawtooth portion 9.
.. is formed by a disk-shaped metal plate having a saw-toothed portion 9 on both sides 5.
It has a width approximately equal to the width between 5 and its depth is
The configuration is such that the cut portion 4 having a shape slightly shallower than the height of the carbide tip 3 is formed.

On the other hand, as shown in FIG. 2 to FIG. 6, the width of the cemented carbide tip 3 between the one side 5 and the other
Are formed so as to be substantially equal to the width of the cut portion 4 formed on the side surface, and projecting portions 7.7 are formed at both corner portions of the side portion 5, and the corner portion on one side and the corner portion on the other side are formed. The spacing between the protruding portions 7, 7 formed on the cemented carbide tip 3 is substantially equal to the thickness of the blade plate 2.
Is inserted into the notch 4 formed in the blade plate 2, the both sides 5 of the carbide tip 3 are in a state along the side 6 of the notch 4, and the inner surface of the protrusion 7 is 2 is formed so as to be substantially in contact with the plate surface portion, and by performing brazing under this condition, the contact portion between the side portion 5 of the carbide tip and the side portion 6 of the cut portion 4 is formed. As a result, the silver brazing flows into the projections 7 and is fixed in a state where the wax reservoirs 10 are formed on both sides of the protruding portion 7. That is, as in the embodiment shown in the figure, when the projections 7 are arranged in a side-by-side manner and a recess is formed between the projections 7, the wax reservoir 10 has filled the recess. It will be formed in shape.

[0010]

The blade for a brush cutter according to the present invention is configured as described above, and prevents the carbide tip from coming off the blade plate in the circumferential direction due to an impact applied during use.
This has the advantage that the durability of the blade itself can be extremely increased.

That is, as in the case of the conventional configuration, when a notch is formed in the blade plate, and a cemented carbide tip is inserted therein and brazed and fixed, the cemented carbide tip is The shape is held only by the side brazing part, and the brazing part becomes fatigued by the impact from the lower surface side during work and the impact from the outer peripheral side of the blade, and the carbide Although the tip comes off in the outer peripheral direction and flies, in the blade for the brush cutter according to the present invention, the inner surface of the protruding portion 7.7 of the carbide tip 3 corresponds to the surface of the blade plate 2. Because it is brazed in contact with
Carbide tip 3 due to impact from the back side of the blade during work
It goes without saying that the wax does not come off, and the solder pools are formed on both sides of the protrusion 7 (a recess formed between the protrusions 7 when the protrusions 7 are formed side by side). 10 is done,
As long as the wax reservoir 10 itself is a strong support portion, the carbide tip 3 does not fly in the outer peripheral direction unless the portion is scraped off from the blade plate 2, and the durability of the entire blade can be extremely improved. There are advantages.

[Brief description of the drawings]

FIG. 1 is an overall view showing a state where a blade is attached to a brush cutter.

FIG. 2 is a front view showing the entire blade of the mower according to the present invention.

FIG. 3 is a partially enlarged view of a blade for a brush cutter according to the present invention.

FIG. 4 is a longitudinal sectional view showing a configuration of a carbide tip.

FIG. 5 is a partially enlarged perspective view showing a configuration of a blade plate and a carbide tip.

FIG. 6 is a partially enlarged perspective view showing an attached state of a carbide tip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blade for brush cutter 2 Blade plate 3 Carbide tip 4 Notch 5 Side 6 Side 7 Projection

Claims (1)

[Claims] 1. A blade plate 2 having a saw blade 9 formed on an outer peripheral portion thereof and a cut portion 4... Formed on a corner thereof, and a side portion 5 extending along a side portion 6 of the cut portion 4. And a cemented carbide tip 3 having a projecting portion 7 projecting in the lateral direction,
The cutting device is characterized in that the side portion 5 of the hard tip 3 is along the side portion 6 of the cut portion 4 and brazed and fixed so that the protruding portion 7 is positioned on the plate surface of the blade plate 2. Blades for payment machines.