JPH10286017A - Tip saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the flying off of cemented carbide tip in the circumferential direction of a bush cleaner blade produced by soldering a number of cemented carbide tips to the circumferential part of a blade disk. SOLUTION: This tip saw 1 is composed of a blade disk 2 having a number of saw teeth 9 on the outer circumference, notches formed on the edges and a number of cemented carbide tips 3 protruded sideways along the side of the notched part. The tip is soldered and fixed in a state to place the side of the tip 3 along the side of the notched part and position the protruded part on the plane of the blade disk.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tip saw used for a power type brush cutter, a power type cutting machine, and the like.

[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]

For example, in the case of mowing using a brush cutter, the tip of the carbide tip frequently comes into contact with a stone rolling on the ground during the operation. However, a strong impact is constantly applied to the cemented carbide tip, and in order to prevent the cemented carbide tip from falling off the blade plate due to the impact, the cemented carbide tip is formed on the blade plate in recent ones In general, it is configured to be brazed while being inserted into the cut-out 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 tip saw, the cemented carbide tip is formed with a protruding part that protrudes outward from the side to increase the brazing strength and prevent the tip from flying during work. It is assumed that.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 2 to 6, a tip saw 1 has a hole 8 for attachment to a brush cutter or a power-type cutting machine at the center thereof. Are provided on the outer periphery of the circular blade plate 2 having
And a notch 4 is formed at each of the corners of the tip, and a protruding portion 7 that protrudes outward is formed at a corner position of the side portion 5 of the carbide tip 3, and is formed on the blade plate 2. When the cemented carbide tip is attached, the side portion 5 is along the side portion 6 of the cutout 4 formed in the blade plate 2, and the back surface of the protrusion 7 is over the plate surface of the blade plate 2. Thus, it has a schematic configuration brazed and fixed.

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 tip saw 1 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 fatigues due to the impact during work and the impact from the outer peripheral side of the blade, and the carbide tip comes out in the outer peripheral direction during the work Will fly away,
In the tip saw 1 according to the present invention, since the inner surfaces of the protruding portions 7 of the carbide tips 3 are brazed in contact with the surface of the blade plate 2, from the side surface added during the work. Of course, the cemented carbide tip 3 does not come off due to the impact of (2), and both sides of the protrusion 7 (when the protrusions 7 are formed side by side, they are formed between the protrusions 7 and 7). Is formed in the recessed portion), the wax reservoir 10 itself serves as a strong support portion, and unless the portion is scraped off from the blade plate 2, the cemented carbide tip 3 does not fly in the outer peripheral direction, and the blade 10 The advantage is that the overall durability can be significantly improved.

[Brief description of the drawings]

FIG. 1 is an overall view showing a state where a chief saw is attached.

FIG. 2 is a front view showing the entire tip saw according to the present invention.

FIG. 3 is a partially enlarged view of the tip saw 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 Tip saw 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,
It 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 brazing is performed so that the protruding portion 7 is located on the plate surface of the blade plate 2. Tip saw.