JPH0638436U - Rotary cutter for brush cutter - Google Patents

Abstract

(57) [Summary] [Purpose] In a rotary cutter for a brush cutter, it is intended to prevent deterioration of sharpness, maintain its durability and durability, and improve work efficiency. [Arrangement] An arc-shaped outer cutting blade 4 having a tip end opened in the rotational direction with respect to the rotational direction of the cutter, and a diameter of the outer cutting blade 4, on the outer peripheral edge of the disk-plate-shaped rotary cutter body 1. This is a rotary cutter for a brush cutter, in which a plurality of cutting inner blades 5 having substantially the same shape are formed inward in the direction to form a plurality of two-stage blades.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary cutter for a brush cutter that is rotated by a power source such as an engine, and particularly to a rotary cutter for a brush cutter that is operated as a portable type.

[0002]

[Prior art]

 This type of portable brush cutter is unstable because it is held by a person's arm to determine the position of the grass when cutting grass, and since it is operated by sliding on the ground, the rotary cutter is used. Not only can soil, dust, sand, etc. adhering to the soil be mowed at the same time, but it may come into contact with trees, stones, mud, etc. on the ground, or even cut into the ground. When the cutter hits such foreign matter, the blade tip is easily chipped, and sometimes grass is wrapped around the blade, which often causes trouble such as engine stall due to excessive load on the engine. In such a case, the cutter lacking the blade is replaced or the grass stuck at the blade edge is removed by hand each time, so the work efficiency is significantly reduced. As a matter of course, this type of cutter blade cuts off dirt, dust, sand, stones, etc. along with grass as described above, so the sharpness of the cutting edge is reduced, and the durability is short. , Therefore, it was often necessary to replace it.

Therefore, as a cutter for solving this kind of problem, for example, as shown in FIG. 3 (No. Shokai 63-10840), the rotary cutter 1 comes into contact with a stone on the ground or the cutting edge bites into the ground. To prevent this, the outer peripheral edge of the cutter body is inclined upward, as shown in FIG. 4 (Actual No. Sho 63-45145), the plate 13 with the saw blade 12 is screwed to the rotary plate 14. In this way, the plate 13 itself is allowed to freely rotate so that the rotary cutter absorbs the foreign matter S to absorb the impact and prevent the blade from chipping. Furthermore, a hard blade is fitted and welded to the cutting edge (actually, the actual cutting is performed). No. 63-92529) and a cutter having a blade shape with a linear saw-tooth cutting edge at its tip (Actual No. 3-83020).

[0004]

[Problems to be solved by the device]

 However, these conventional rotary cutters are insufficient in terms of performance and durability, and also in handling, and satisfactory results have not been obtained. That is, the above-mentioned one shown in FIG. 2 can prevent the cutting edge from being cut into the ground even if the cutting edge is prevented from biting, and the one shown in FIG. It is difficult to restore it to the position and there is a problem in operation. In addition, none of these have solved the problem of the reduction in cutter sharpness. Furthermore, neither a hard blade separately fitted and welded nor a blade-shaped cutter has been solved in terms of the durability of the sharpness of the cutter and the lack of the cutting edge.

The present invention has been made to deal with the above-mentioned actual situation, and in particular, it has been used for a long period of time by discovering a new configuration regarding the shape of the cutting blade of the cutter, its inclination direction, the arrangement, and the like. Even if the sharpness is not deteriorated and the replacement frequency is low, the objective is to improve work efficiency.

[0006]

[Means for Solving the Problems]

 One of the features of the rotary cutter for a brush cutter of the present invention that can achieve the above-mentioned object is that one is opened in the rotational direction at substantially the same intervals in the circumferential direction at the tip of the outer peripheral edge of the disc plate-shaped rotary cutter body. In addition to forming a plurality of cutting blades each having a circular arc shape and having at least two radial inner and outer blades, the plurality of cutting blades are alternately arranged in the circumferential direction or the cutting edges are inclined to one side at appropriate intervals. In order to achieve the same purpose, the other one has a front blade that is inclined toward the outer peripheral edge of the disk plate-shaped rotary cutter, and the A cutting outer blade with an arcuate shape that is used with respect to the rotational direction at a distance and whose cutting edge is inclined to one side, and a cutting outer blade that is approximately the same shape radially inward and the cutting edge is inclined to the opposite side. This is where a plurality of two-step cutting blades consisting of inner cutting blades are formed.

[0007]

[Action]

 The rotary cutter of the present invention is a circular-shaped cutting blade that is a two-step blade on the outer side and the inner side in the radial direction. Moreover, the inclination direction of the cutting edge of the cutting blade is within one set or between adjacent sets. On the contrary, a plurality of, preferably eight, blades are provided. In the conventional rotary cutter, only the outer one cutting edge is provided, whereas the inner and outer cutting blades are inclined in opposite directions, and Since there are two blades, the outer and inner blades, it is certain that the grass bites, and even if the outer cutting blade is worn by use, the inner cutting blade still exists, so The performance will still work effectively. Therefore, the life of the entire cutter is about twice that of the outer cutter alone. In addition, when cutting with a brush cutter equipped with the cutter of the present invention, the outer cutting blade is used to cut the grass. At this time, the inner cutting edge will also function at the initial stage, but if the inner cutting edge and the outer cutting edge have their cutting edges tilted on opposite sides, it may fail to bite the outer blade or grass. Even if you do this, you will cut the grass completely with this inner blade. When they are on the opposite side alternately, they can be used from both the front and back sides of the cutter in addition to the above-mentioned complementary bite.

In addition, even if the cutter of the present invention is used for a long period of time and the outer blade is worn and the sharpness is deteriorated, the inner blade is still perfect, so that the function of the inner blade is fully exerted. Be done. Therefore, the work efficiency of the brush cutter as a whole cutter does not decrease at all. Furthermore, even if the cutter of the present invention is worn out and worn back by using both the outer and inner blades at the end, it can be easily repaired with a normal round file since it has an arc shape with almost the same shape. (The blade shape will be deformed when a glider is used.) Therefore, not only maintaining the performance of the cutter, but also improving the durability contributes to the improvement of work efficiency.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic view showing an example of a rotary cutter according to the present invention, in which 1 is a rotary cutter body, 2 is a mounting hole for mounting the cutter on the shaft of the brush cutter body, Reference numeral 3 denotes a cutting blade which is formed in two steps in the radial direction inside and outside in the direction of rotation at the tip of the outer peripheral edge of the rotary cutter body 1, and the cutting blade 3 can be easily pushed by a manual round file or the like. In the illustrated example, the outer cutter outer cutter 4 and the inner cutter inner cutter 5 continuously located inward of the outer cutter outer cutter 4 are divided into eight stages by dividing the circumference into substantially equal parts in the illustrated example. It is provided.

In the embodiment shown in FIG. 1, the cutting blades 3 arranged substantially equally in the circumferential direction have a cutting edge structure of a front blade and a back blade in which the cutting edges are alternately inclined in the opposite direction. . Here, the eight cutting blades 3 arranged in approximately equal parts usually have the same shape, and only the cutting edge directions are inclined in the opposite directions, but the shapes are not necessarily the same and there are some differences. It doesn't matter. Further, the outer cutting blade 4 and the inner cutting blade 5 do not necessarily have to have the same shape, and it is sufficient that they can fulfill their functions.

Further, the number of the cutting blades 3 having two inner and outer stages arranged on the outer peripheral edge of the cutter body 1 is not limited to eight, but at least a plurality of them are necessary because of a general cutter structure, Naturally, depending on the size, the shape of the cutting edge, the size, etc., the setting of 6 to 8 is most effective, and they are arranged in the outer peripheral edge of the cutter body 1 substantially equally.

In the embodiment described above, the cutting blades 3 alternately serve as the cutting edges of the front blade and the back blade in the circumferential direction. It can also be applied to the outer and inner blades.

FIG. 2 is an embodiment showing such a case, in which the outer arc-shaped cutting outer blade 4 is formed as a front blade, while the inner arc-shaped cutting inner blade 5 is formed as a back blade.

In this case, the outer cutting blades 4 and the inner cutting blades 5 are alternately arranged in the circumferential direction so that the outer cutting blades 4 and the inner cutting blades 5 are staggered alternately. It is also possible to arrange them.

Such arrangement of the inside and outside of the front and back sides is suitable for equalizing the sharpness and cutting of both the inside and outside cutting blades.

In both of the above embodiments, the inclination angle α between the line connecting the vertices of the arc of the cutting blade and the line connecting the center of the rotary cutter body 1 and the outermost point of the cutting outer blade 4 A preferred range is 10 to 45 °. If it is less than 10 °, the complementary function of the inner cutting blade 5 is lowered. On the other hand, when the angle exceeds 45 °, the outer blade 4 and the inner blade 5 are worn at the same time, which is not so preferable.

[0018]

[Effect of device]

 As described above, the present invention is provided with a plurality of two-step cutting blades including an arc-shaped cutting outer blade and an inner cutting blade having the same shape as the cutting outer blade on the outer peripheral edge of the rotary cutter body for the brush cutter. Since these blades are configured to use blade edges that are inclined on opposite sides, when the cutter is attached to a brush cutter that is rotated by a power source for operation, the cutting blade has an arc shape. Since the grass does not escape and the angle of inclination of the cutting edge is opposite to each other, the grass is well bited into the cutting edge, and therefore the grass cutting efficiency is very good, and the outer blade is damaged by stones or the like. Even if the wear disappears, the inner blade in the second step continues to function instead, so the sharpness of the rotary cutter does not deteriorate at all, and its performance is demonstrated over a long period of time compared to conventional rotary cutters. To maintain work efficiency It can be. 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 blades can be easily restored with a round file again. Combined with the reduction of the burden and the reduction of fuel consumption, it has a remarkable effect that greatly contributes to the improvement of the efficiency of mowing work.

Since the rotary cutter of the present invention has an arcuate shape and is formed so as to cut in and out, it is possible to cut even soft grass or moving scraps in a stationary state, and to cut hedges or vegetation. It is also useful for pruning.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of a rotary cutter according to the present invention.

FIG. 2 is a schematic plan view showing another embodiment of the rotary cutter according to the present invention.

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

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

[Explanation of symbols]

 1 Rotating cutter 2 Mounting hole 4 Outer cutting blade 5 Inner cutting blade S Foreign material

Claims (2)

[Scope of utility model registration request] 1. A cutting blade having an arcuate shape, which is opened in the rotational direction at substantially equal intervals in the circumferential direction at the tip of the outer peripheral edge of a disk plate-shaped rotary cutter body, and which has at least two radial inner and outer blades. A plurality of cutting blades are alternately formed in the circumferential direction, or a plurality of cutting blades are arranged in a circumferential direction, or at a proper interval, the cutting edge is a front blade inclined to one side and a back blade inclined to the opposite side. Rotary cutter for brush cutters. 2. A cutting outer blade having a circular arc shape used at a peripheral edge of a disk-plate-shaped rotary cutter body at substantially equal intervals in the circumferential direction and used in the rotational direction, and the blade edge of which is inclined to one side,
A brush cutter having a plurality of cutting blades each having a two-step structure of an inner cutting blade having substantially the same shape and an inner cutting edge inclined toward the opposite side on the inner side in the radial direction of the outer cutting blade. Rotary cutter.