JPH085014Y2 - Electric cutter blade - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a blade body of an electric cutter, and more particularly to a blade body for cutting concrete members, asphalt, stone materials, pile / fume pipes, rocks, reinforcing bars or iron plates.

[0002]

2. Description of the Related Art A blade of a conventional electric cutter will be described by taking a diamond blade as an example. On the outer peripheral surface of the diamond blade, a whetstone segment containing abrasive grains of diamond is fixed as a blade. And FIG.
Further, as shown in FIG. 6, the grindstone segment 8 is made of a single material and has a thickness equal to or larger than the blade main body, and it is fixed to the blade main body by a method such as brazing or laser welding. The surface of the conventional grindstone segment may be flat,
In order to reduce the cutting or grinding resistance to the work material and improve the sharpness, the surface is made into a crank-shaped uneven surface or a wavy uneven surface as shown in FIG. Also,
It has also been attempted to reduce the grinding resistance of the cutting edge by reducing the thickness of the grindstone segment to improve the sharpness.

In order to reduce the grinding resistance of the blade and improve the sharpness, the conventional products have been devised as described above. However, even if the surface of the grindstone segment has an uneven surface, the segment itself has a considerable thickness, so that the thickness of the cutting edge, which is the grinding width, becomes large, and it is not possible to obtain sufficiently good sharpness. Further, however, if the thickness of the grindstone segment is reduced, the segment itself may be damaged, or the strength of the fixed portion of the segment becomes insufficient, causing the segment to separate from the blade body.

[0004]

In the blade body of an electric cutter in which a cutting blade 2 extends around a circular blade body 1, the cutting blade 2 has a relatively thin two cutting edges 3. , 4, the cutting edges 3, 4 extend on both sides of the cutting edge 2 along the circumferential surface, and the gap portions of both cutting edges 3, 4 slide along the circumference.
The inner and outer surfaces of both cutting edges 3 and 4 are alternately arranged so that concave and convex surfaces are alternately arranged so as to meander while drawing a kana arc, and the uneven surfaces on both inner surfaces face each other, and the heights of the tops 6 and 7 of the respective convex portions on the respective inner surfaces are increased. The lines connecting the tops 6 of the respective convex surfaces on one inner surface reach the lines connecting the tops 7 of the respective convex surfaces on the other inner surface. It is characterized in that the filling member 5 having a lower hardness than that is interposed.

[0005]

Embodiments of the present invention will now be described with reference to the drawings. The blade main body 1 is a circular metal plate, and eight cuts 9 are provided at equal intervals around the metal plate. The cut 2 is fixed around the blade body divided by the cut 9. The cut 2 has two relatively thin cutting edges 3 and 4 along both sides of the periphery thereof, and the cutting edges 3 and 4 have a function of actually grinding a stone material or an iron plate. Since the entire thickness of the cutting edge 2 of the present invention is almost the same as that of the conventional one, the present invention in which the cutting edge is divided by providing a gap in the center thereof has a cutting edge and a work material. The contact area is about 30 to 50% smaller than the conventional product. As the material for the cutting edge, any material having hardness that can cut concrete members, iron plates, etc. may be used, and for example, metal containing cemented diamond grains, cemented carbide, or new ceramic is used.

The inner surfaces of the cutting edges 3 and 4 are wavy.
The convex surface on one inner surface and the concave surface on the other inner surface are arranged so as to face each other. Therefore, the gaps between the cutting edges 3 and 4 meander with the same width and amplitude. As shown in FIG. 4, the line connecting the tops 6 of the respective convex surfaces arranged on one inner surface coincides with the line connecting the tops 7 of the respective convex surfaces arranged on the other inner surface. In FIG. 4, a line connecting the tops 6 and 7 of the respective convex portions arranged on both inner surfaces is the center line 11 of the cutting edge 2. In the present invention, it is a condition that these two lines are at least coincident with each other, and one line may slightly exceed the other line. Thus, the reason why the line connecting the tops 6 and the lines connecting the tops 7 of the respective convex portions arranged on both inner surfaces must be at least coincident with each other is that if one line does not reach the other line, This is because the grinding action is not performed in the area between these lines. Further, the tops 6 or 7 lined up on the inner surface are formed at substantially the same height. However, some of the tops may be slightly lower than the straight line connecting the tops, and in the present invention, As long as such a thing can exhibit the effect of this invention, it is naturally one aspect of this invention.

The cutting edges 3 and 4 consist of two thin members,
A cutting blade 2 is formed by sandwiching a thin filling member 5 therebetween and fixing these members. The filling member 5 has cutting edges 3 and 4
Any material with a lower hardness than, for example, copper, soft iron,
Soft metals such as brass and heat resistant synthetic resins are used. The filling member 5 is not for cutting or grinding,
This is to reinforce the strength of the two thinly formed cutting edges 3 and 4. Therefore, before the use of the blade body, the ends of the cutting edges 3 and 4 and the surface of the filling member 5 have the same height,
During use, the relatively soft filling member 5 immediately rubs and its surface recedes, so that only the two cutting edges 3 and 4 project to perform cutting and grinding operations. Further, since the filling member 5 is interposed, even if the cutting edges 3 and 4 are cracked during use, they remain fixed to the filling member 5, so that the broken cutting edge particles are not scattered. It's safe. The structure of the cutting blade 2 of the present invention is not limited to this embodiment, and as shown in FIG. 3, a groove may be provided on the upper surface of the cutting member 10 and the filling member 5 may be filled therein. Good. Further, the surface of the cutting edge 2 is not limited to the case where it is formed in a wavy shape, and it may be a flat surface.

[0008]

The present invention is constructed as described above, and the cutting edge 2 has two relatively thin cutting edges 3 and 4, and these cutting edges 3 and 4 are formed on the circumferential surface. It extends along both sides of the cutting edge 2. Therefore, the contact area between the cutting edges 3 and 4 and the work material is small, and the width of each cutting edge 3 and 4 is small, so that cutting and grinding resistance is small, and sharpness is improved. Further, by reducing the cutting and grinding resistance, the load on the motor is lightened and the rotation speed is kept high and maintained, so that the cutting and grinding speed can be increased.
Conventionally, the periphery of the blade has two cutting edges and
What was formed in the three layers of filling members between
However, the filling member has crank-shaped irregularities as shown in FIG.
Therefore, the inner surface of the cutting edge also has a crank-like uneven surface.
Had become. As a result, when the blade rotates,
Since the bent part hits stones at a right angle, cutting
There was a risk of cracks in the edges and breakage of the cutting edges. this
On the other hand, in the present invention , concave and convex surfaces are alternately arranged on both inner surfaces of both cutting edges 3 and 4 so that the gap portions of both cutting edges 3 and 4 meander while drawing a smooth arc along the circumference. The uneven surfaces on both inner surfaces face each other. Therefore, when cutting,
The inner surface does not hit the stone at right angles to the direction of rotation, but at an angle
Since it hits, the cutting edge is cracked or the cutting edge is damaged.
That can be effectively prevented.

[Brief description of drawings]

1 is a front view of the present invention

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view showing another embodiment of FIG.

FIG. 4 Peripheral view of cutting edge

5 is a cross-sectional view of the conventional product of FIG.

FIG. 6 is a peripheral view of a conventional cutting blade.

[Explanation of symbols]

1 Blade Main Body 2 Cutting Edge 3 Cutting Edge 4 Cutting Edge 5 Filling Member 6 Top 7 Top 8 Grindstone Segment 9 Cutting 10 Cutting Member 11 Centerline

Claims (1)

[Scope of utility model registration request] 1. A blade body of an electric cutter in which a cutting blade 2 extends around a circular blade body 1, the cutting blade 2 being relatively thin.
With the cutting edges 3 and 4 of the stripes, the cutting edges 3 and 4 extend on both sides of the cutting edge 2 along the circumferential surface, and the gap portions of both cutting edges 3 and 4 extend along the circumference. The inner and outer surfaces of both cutting edges 3 and 4 are arranged alternately with concave and convex surfaces so that the concave and convex surfaces of both inner surfaces face each other, and the heights of the tops 6 and 7 of the respective convex surfaces of the respective inner surfaces face each other so as to meander while drawing a smooth arc. The lines connecting the tops 6 of the respective convex surfaces on one inner surface reach the lines connecting the tops 7 of the respective convex surfaces on the other inner surface. Blade body of an electric cutter, characterized in that a filling member 5 having a hardness lower than that of the blade is interposed