JP2523018Y2 - Rotary cutter for brush cutter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutter for a brush cutter which is rotated by a power source such as an engine, and more particularly to a rotary cutter for a portable brush cutter.

[0002]

2. Description of the Related Art This type of portable brush cutter is unstable because a human arm is used to determine the position of the grass against the grass, and the brush cutter is operated close to the ground. , The soil where the rotating cutter is attached to the grass,
In addition to cutting off dust, sand, and the like at the same time, they may come into contact with trees, stones, mud, and the like on the ground, and sometimes cut into the ground. When the cutter hits such a foreign substance, the blade tip is easily chipped, and sometimes grass is wound around the blade, so that troubles such as overloading the engine and causing engine stall are often observed. In such a case,
The work efficiency is significantly reduced because the cutters with missing blades are replaced or the grass stuck to the cutting edge is manually removed each time. Naturally, this kind of cutter blade, as mentioned above, cuts off soil, dust, sand, stones, etc. together with grass, so the cutting edge of the blade is reduced and the durability and durability are short. For that reason, it was necessary to frequently replace the battery.

[0003] As a cutter for solving this kind of problem, for example, as shown in FIG. 3 (Japanese Utility Model Application Laid-Open No. 63-10840), the rotary cutter 1 comes into contact with a stone on the ground or a cutting edge cuts into the ground. The outer peripheral edge of the cutter body is inclined obliquely upward so that the plate 13 having the saw blade 12 is screwed to the rotating plate 14 as shown in FIG. The plate 13 itself can be freely rotated, and even if the rotary cutter hits the foreign matter S, the impact is reduced to prevent the chipping of the blade. Further, a hard blade is fitted and welded to the edge of the blade. No. 63-92529) or a blade having a wing-like shape and having a straight saw-toothed blade at its tip (Japanese Utility Model Laid-Open No. 3-83020) or a rake face of a cutting blade.
Alternating top and bottom (Japanese Utility Model No. 56-134128)
With two cutting blades inclined in the same direction (June 6
No. 1-5063) have been devised.

[0004]

However, these conventional rotary cutters are inadequate in terms of performance and durability and furthermore in handling, and satisfactory results have not been obtained.
That is, as shown in Figure 3 of the foregoing, even biting of the cutting edge to indeed ground is prevented, reduced, etc. hardly escaped the sharpness of the cutter, also as shown in FIG. 4 is a plate itself original to perform the recovery position is difficult, there are operational problems. In addition, none of these methods solves the problem of the sharpness of the cutter. Further, the hard blade separately fitted and welded or the wing-shaped cutter have not been solved at all in terms of the sustainability of the sharpness of the cutter and the lack of the cutting edge. On the other hand, the cutting blade is provided in two stages.
The cutting edge is the same, so the sharpness is slightly reduced.
I cannot escape.

The present invention has been made in order to cope with the actual situation as described above. In particular, the present invention finds a new configuration for the shape of the cutting blade of the cutter, its inclination direction, arrangement, and the like, so that it can be used for a long time. Even if the sharpness does not decrease,
In addition, the replacement frequency is low, and the object is to improve the work efficiency.

[0006]

That is , the feature of the rotary cutter for the brush cutter of the present invention which can achieve the above-mentioned object is that the rotary cutter body in the form of a disk plate has a circumferential edge at the tip thereof.
And arcuate were opened in the rotational direction at a substantially equal interval, the rotation
The blade edge of the rotary cutter body is continuously
A cutting inner blade inclined to one side with respect to the plate surface;
Certain cutting blade in two stages in which the cutting edge at substantially the same shape in the radially outer side of the inner cutter is made of a cutting outer blades inclined in said blade and counter-<br/> contralateral where obtained by plural number.

[0007]

[Action] rotary cutter of the present invention is a two-stage blade radially outer and inner as arcuate cutting blade, moreover inclined direction of the cutting edge of the cutting blade is a table back opposite in one group A plurality of, preferably eight, are provided. In the conventional rotary cutter, only the outer one-stage cutting blade is provided. On the other hand, the inclination directions of the cutting edges of the inner and outer cutting blades are opposite to each other. Since there are two blades and inner blades, grass penetration is assured, and even if the outer cutting blade is worn due to use, there is still an inner cutting blade. It will work effectively. Therefore, the life of the entire cutter is about twice as long as that of the outer cutter alone.
In the case of mowing with a mower equipped with the cutter of the present invention, first, the grass is cut into the outer cutting outer blades. Lost in this case becomes a also function cutting the blade at an early stage, biting outer cutter grass from cutting the blade and cutting outer cutter is an inclined direction of the cutting edge on the opposite side
Even if you lose, you will cut the grass completely with this inner blade. When alternately on the opposite side, the cutter can be used from both the front and back surfaces, in addition to complementing the bite.

[0008] Even if the cutter of the present invention has been used for a long period of time and the outer cutter has been worn and its sharpness has deteriorated, the inner cutter is still perfect, so that the function of the inner cutter is fully exhibited. You. Therefore, the working efficiency of the bush cutter as a whole does not decrease at all. Furthermore, even if the cutter of the present invention finally wears out both the outer blade and the inner blade, it can be easily repaired with an ordinary round file because it has an almost identical arc shape. (Blade type With gley down Zehnder is deformed.) Thus the performance maintenance of the cutter, of course, the improvement of durability, thereby contributing to the improvement of work efficiency.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the basic structure of the rotary cutter according to the present invention.
FIG. 2 is a schematic view showing an example for explaining the configuration, in which 1 is a rotary cutter main body, 2 is a mounting hole for mounting the cutter on a shaft of a brush cutter main body, and 3 is an outside of the rotary cutter main body 1. The cutting edge 3 is an arc-shaped opening that opens in the rotation direction at the tip of the peripheral edge, and is formed in two steps in the radially inner and outer directions. The cutting blade 3 is easily formed by a hand-operated round file or the like. In the example shown in the figure, eight circumferentially equally divided circumferential parts are provided on the rotary cutter main body 1 as two-stage blades of the cutting inner blades 5 that are continuously positioned on the inside in the rotation direction front side. Have been.

[0011] In the configuration shown in FIG. 1, 1-stage
No. 56-134128
As shown in FIG. 2, the cutting blades 3 which are substantially equally distributed in the circumferential direction have a cutting edge structure of a front blade and a rear blade whose cutting edges are alternately inclined in opposite directions, but in the present invention, FIG. As shown
In the outer blade 4 and the inner blade 5 of one cutting blade, the above-mentioned front blade and back blade
Is adopted. That is, the outer circle in FIG.
The arcuate cutting blade 4 is used as the front blade, while the inner arc is formed on the inside.
The cutting inner blade 5 is formed as a back blade. Here, the eight cutting blades 3 arranged approximately equally are usually the same shape, and only the cutting edge direction is inclined in the opposite direction, but the shapes are not necessarily the same and there are some differences. No problem. Further, it is not always necessary that the outer cutting edge 4 and the inner cutting blade 5 have the same shape, and it is sufficient if they can fulfill their functions.

Further, the number of the cutting blades 3 having a two-stage configuration inside and outside disposed on the outer peripheral edge of the cutter body 1 is not limited to eight as shown in the figure, but at least a plurality of cutting blades are necessary from a general cutter structure. It is naturally determined by the size of the cutter, the shape and the size of the cutting edge, etc., but the setting of 6 to 8 pieces is most effective, and the setting is substantially equally arranged on the outer peripheral edge of the cutter body 1.

In the above, the outer cutting edge 4 and the inner cutting edge 5 are alternately used as a front blade and a rear blade in the circumferential direction, respectively, so that the outer cutting blade 4 and the inner cutting blade 5 are alternately arranged. It is also possible to arrange. Such an arrangement with the inside and outside front and back is suitable for averaging the sharpness and the mowing of both the inside and outside cutting blades.

[0014] The inclination angle of the line connecting the apex of the arc of the cutting blade in the above you施例, a line connecting the outermost point and the center of the cutting outer blades 4 of the rotating cutter body 1 alpha The preferred range of (see FIG. 1) is 10 to 45 °. If the angle is less than 10 °, the complementary function of the inner cutting edge 5 is reduced. On the other hand, if the angle exceeds 45 °, the outer cutter 4 and the inner cutter 5 are simultaneously worn, which is not preferable.

[0015]

[Effects of the Invention] As described above, the present invention provides a two-stage cutting blade consisting of an arc-shaped cutting outer blade and a cutting inner blade having substantially the same shape on the outer peripheral edge of the rotary cutter body for a brush cutter. Provide multiple,
In addition, since these blades are constructed using blades that are inclined to the opposite sides inside and outside , when this cutter is mounted on a brush cutter that is rotated by a power source and operated, the cutting blade has an arc shape. Because there is no grass escape
Moreover, because the angles of inclination of the inner and outer blades are opposite, the cutting blades have good penetration of the grass, and the grass cutting efficiency is very good. Instead, the inner blade of the second stage continues to function, so the cutting performance of the rotary cutter does not decrease at all, and its performance can be exhibited over a longer period compared to the conventional rotary cutter, and the work efficiency can be maintained. it can. In addition, both the outer and inner blades can be easily created with a round file, and even if the wear disappears, the sharpening of the blade can be easily restored with the round file again. It has a remarkable effect that greatly contributes to improvement of mowing work efficiency in combination with reduction of fuel consumption and fuel consumption.

The rotary cutter of the present invention has an arc shape,
Since it is formed so as to be called and cut, it can be cut in a stationary state even with a soft grass or a moving sword, and is also useful for cutting a hedge or a plant.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of a rotary cutter for explaining a basic configuration of the present invention.

2 is a schematic plan view showing the actual施例rotary cutter according to the invention.

FIG. 3 is a partial perspective view showing a use state of a conventional rotary cutter.

FIG. 4 is a partial plan view showing a use state of a conventional rotary cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary cutter 2 Mounting hole 4 Outer cutting edge 5 Inner cutting edge S Foreign matter

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk plate-shaped rotary cutter body of the outer peripheral edge tip in the circumferential direction substantially equidistantly spaced cutting edge thereof continuously in a circular arc shape at and longitudinal rotation direction was opened in the rotational direction is the times
Rolling and cutting the blade plate surface of the cutting body against inclined to one side, the cutting edge at substantially the same shape in the radially outer side of the該切write the blade sloping cutting outer cutter on the opposite side of the inner blade A rotary cutter for a brush cutter, comprising a plurality of cutting blades having a two-stage configuration.