JPH0739333U - Rotary blade for brush cutter - Google Patents

Abstract

(57) [Summary] [Purpose] The main purpose of this is to prevent cut grass from being wound around the mounting shaft when cutting grass with a brush cutter. [Structure] An inner blade having a saw-shaped blade tip is provided upward from the rotary blade main body side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a rotary blade mounted on a brush cutter main body for use. In particular, the present invention relates to a rotary blade that prevents the cutting of the grass by cutting the grass or the vine (hereinafter simply referred to as grass) that is going to be wound around the mounting shaft of the rotary blade when the brush cutter is used. .

Furthermore, in a rotary blade for a brush cutter of this type, which is provided with a weight-reducing hole for the purpose of reducing the weight of the rotary blade, secondary cutting of the grass around the weight-reducing hole occurs. It relates to a rotary blade that tries to prevent entanglement.

It is well known that this type of brush cutter is widely used in fields and home gardens. In normal use, a person stands in front of the grass and cuts the grass by rotating the rotary blade of the brush cutter. In this case, uncut grass is naturally proliferating on the back side of the brush cutter, so the cut grass is scattered on the uncut grass side, but a considerable amount of uncut grass is obstructed. Then, the cut grass cuts down and scatters on the mounting shaft side of the rotary blade.

Therefore, it has been impossible to prevent the cut grass that is scattered on the mounting shaft side from winding around the mounting shaft.

In particular, since the rotary blade is usually attached to the mounting shaft in an inverted inverted T-shape, the base of the mounting shaft is subjected to rotational stress and the cutting blade is strongly wrapped around the mounting shaft. It was difficult to remove it.

Further, in this type of brush cutter, a so-called weight-reducing hole is formed in the rotary blade main body in order to reduce fatigue in labor management of an operator. Although it can be evaluated that the problem has been solved, there is a secondary problem that the above-mentioned mowed grass after cutting fills the weight-reducing hole, is wound, or is entangled (see Japanese Utility Model Publication No. 60-26582). ).

[0007]

[Prior art]

 Therefore, of the above-mentioned problems, in the former case, a so-called auxiliary blade having a plurality of cutting edges around the mounting hole provided at the center of the rotary blade main body is raised in a direction perpendicular to the main body. There is a device that cuts grass that is to be wound around the mounting shaft side with this auxiliary blade (Japanese Utility Model Laid-Open No. 5-51031).

However, with the auxiliary blade of this conventional example, the blade tip (which is in a position parallel to the rotary blade body) at a position separated from the rotary blade body by a certain height causes the blade to move toward the mounting shaft side after cutting. Although it can be expected to cut off scattered grass, there is no cutting edge on both sides of the auxiliary blade (which is positioned in the direction perpendicular to the rotary blade body), and both sides are in a direction perpendicular to the rotary blade body. Since it stands upright, the grass that comes flying after cutting is not cut along both sides of the auxiliary blade, but is wound around the lower body of the auxiliary blade or is scattered over the rotary blade body as it is. However, after all, there is a problem that not only the mounting shaft but also the brush cutter itself is wound.

As for the latter problem, as far as the inventor is aware, the fact is that nothing has been solved yet.

[0010]

[Problems to be solved by the device]

 The problems to be solved by this invention are around the mounting shaft of the rotary blade of the brush cutter, and in particular, wrapping of cutting grass scattered after cutting by the outer peripheral blade with respect to the base located at the boundary between the mounting shaft and the rotary blade. In addition to the entanglement, in addition to the fact that the rotary blade has a so-called lightening hole to reduce the weight of the rotary blade, the grass cut off after cutting may fill the lightening hole or may scatter after cutting into the hole. It is a problem that the sown grass is entangled or entangled.

[0011]

[Means for Solving the Problems]

 The basic configuration of the present invention is that the rotary blade body is inclined from the rotary blade body side upward with respect to a horizontal rotary blade body with a certain distance from the mounting hole of the rotary blade body provided with the outer peripheral blade. In addition, it is characterized in that it is provided with an inner blade having a sawtooth blade edge,

In a rotary blade for a brush cutter having a saw blade on the outer peripheral edge and a mounting hole at the center, a weight-reducing hole is provided at a constant distance from the mounting hole, and a rotating direction of the rotary blade And a feature that an auxiliary blade is provided at the edge of the weight-reducing hole on the side opposite to

Further, in a rotary blade for a brush cutter having a horizontal blade edge on the outer peripheral edge and a mounting hole at the center, an endless weight-reducing hole is provided at a constant distance from the mounting hole. It is also mentioned that an auxiliary blade is provided on the entire inner peripheral edge of the weight-reducing hole.

[0014]

[Action]

[ Claim 1 ] A considerable amount of grass is cut by the outer peripheral blade and then scattered toward the outside of the rotary blade main body, but the rest is scattered by the outer peripheral blade and then scattered to the mounting shaft side. Although they try to wrap around the shaft side, these cuttings are not limited to the base of the mounting shaft as well as the base of the mounting shaft due to the inner blade having a serrated cutting edge that is gradually inclined upward from the rotary blade body side. Even at a height away from, it is surely cut.

In particular, since the inner blade is provided stepwise, the remaining grass is cut along the inclined blade edge without sliding again by sliding upward.

[0016]

[Action]

[ Claim 2 ] Since the weight-reducing hole is provided, after cutting the grass with the saw-shaped outer peripheral blade, the cutting blade scatters toward the outside of the rotary blade body, but the remaining portion is cut with the outer peripheral blade. After that, it scatters on the mounting shaft side and tries to wind it around the weight reduction hole or try to entangle it, but because the edge of the weight reduction hole has an auxiliary blade on the opposite side to the rotation direction of the rotary blade, Cut grass is cut by this auxiliary blade after cutting.

[0017]

[Action]

 [Claim 3] Since the auxiliary blade of the weight-reducing hole has an endless shape, it can be used without being restricted in the rotating direction of the rotary blade when the outer edge of the blade is horizontal, and the auxiliary blade of the weight-reducing hole is caught in the weight-reducing hole. The cutting grass can be cut by its auxiliary blade.

[0018]

Embodiment 1 The details of the present invention will be described below with reference to the accompanying drawings. 1 to 3 are drawings of Embodiment 1, FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG.

A disk-shaped rotary blade main body 12 having an outer peripheral edge 10 provided on the outer peripheral edge (in all the examples, including the following examples in this specification, the rotary blade main body has a disk-like shape, A mounting hole 14 for supporting a mounting shaft (not shown) of the brush cutter is provided at the center of the rotary blade body. Although the type of the outer peripheral blade 10 is shown as a saw-shaped one in the drawing, it may be a horizontal type instead of a so-called flat blade saw-shaped type, and the type is not limited. Absent.

A pair of inner blades 18 are provided at a fixed distance from the mounting hole 14.

These inner blades 18 scatter to the mounting shaft side after being cut by the outer peripheral blade 10 during use, and secondarily cut the grass to be wound, thereby cutting the cutting grass to the mounting shaft side. This is to prevent the wraparound.

As is apparent from FIG. 2, the inner blade 18 is gradually inclined upward from the rotary blade body 12 side in a direction perpendicular to the horizontal rotary blade body 12 and upward. A saw blade 16 is provided on the top.

Since the cutting edge 16 has a serrated shape, the type of cut grass is hard, or the cut grass becomes hard when the summer season has passed and the cut grass has fallen. Is.

The inner blade 18 inclines gradually from one side to the other side in FIG. 2, but it is easy to catch grass when the inclination angle is an acute angle rather than an obtuse angle.

Further, referring to FIG. 3, although the pair of inner blades 18 themselves are inclined with respect to the rotary blade body 12 in an inverted C shape (indicated by a half at a right angle in the drawing). It may be upright, and there is no particular limitation as long as there is no inclination and the angle is obtuse at this point. Further, the cutting edges 16 may be provided with different shapes and angles.

Further, the inner blade 18 according to this embodiment is curved outward along the outer peripheral edge of the rotary blade main body 12, but this is not a limitation.

The processing means of the inner blade 18 of this embodiment is such that a part of the rotary blade main body 12 is internally punched out by press molding and a part of the rotary blade main body 12 is erected, and the part thereof is erected to provide the saw-shaped blade edge 10. In this way, the inner hole is eventually used as the weight-reducing hole 20, but the structure of the inner blade 18 is not limited to this embodiment, and the presence or absence of the weight-reducing hole 20 is irrelevant.

Here, the term “lightening hole” is used in this specification for the purpose of reducing the weight of the rotary blade body 12 when it is used. There is.

Further, the number of inner blades 18 is not necessarily limited to the embodiment.

As will be apparent from FIG. 1, an auxiliary blade 22 is formed on the edge of the weight-reducing hole 20 on the side opposite to the rotating direction of the rotary blade body 12, and the auxiliary blade 22 has a weight-reducing hole. When 20 is provided on the rotary blade main body 10, it is intended to prevent the grass to be wound up from entering the weight-reducing hole 20 and being wound or entangled.

[0031]

Example 2

4 to 6 are drawings of the second embodiment, FIG. 4 is a front view, FIG. 5 is a sectional view taken along the line CC of FIG. 4, and FIG. 6 is a sectional view taken along the line DD of FIG. is there.

This embodiment is essentially the same as the first embodiment in terms of the concept of the invention.

In this embodiment, as is apparent from FIG. 4, inner blades 18 are provided on the left and right sides of the drawing with a space therebetween, and two inner blades 18 are provided.

In other words, the inner blade 18 in the first embodiment has a shape in which it is divided at the central portion.

In the inner blade 18 according to this embodiment, in order to suppress the weakening of the strength that occurs when the lightweight blade 20 is provided in the rotary blade body 12, the connecting portion 24 is left between the pair of inner blades 18. There is something.

Since the other configurations and functions are the same as those of the first embodiment according to the above, the description of the first embodiment is applied to the common points and the description thereof is omitted.

[0038]

Third Embodiment FIGS. 7 to 9 are drawings of a third embodiment, FIG. 7 is a front view, FIG. 8 is a sectional view taken along line EE of FIG. 7, and FIG. 9 is a sectional view taken along line FF of FIG. It is a figure.

The configurations of the outer peripheral blade 10, the rotary blade body 12, the central mounting hole 14, the weight-reducing hole 20, and the auxiliary blade 22 at the edge of the weight-reducing hole 20 of this embodiment are the same as those of the first embodiment. .

This embodiment is characterized in that two types of inner blades 26 and 28, which are triangular when viewed from the front, are provided on the mounting hole 14 side of the four weight-reducing holes 20.

Of these two types of inner blades 26, 28, one inner blade 28 is apparent with reference to FIG. 9, and is inclined outward and obliquely upward with respect to the rotary blade body 12. .

The other inner blade 26 stands upright with respect to the rotary blade body 12.

A blade tip 30 is provided on each of the inner blades 26, 28, except for one side of the inner blades 26, 28 on the rotary blade body 12 side.

This embodiment is an example in which two kinds of inner blades 26, 28 are provided in combination. However, since the slanting inner blade 26 extends to the outside, at the time of use. The grass to be wound around the mounting shaft side is first cut by the cutting edge 30 of the slanted inner blade 26, and the cutting grass leaked by the cutting edge 30 is substantially positioned inside thereof. The cutting edge 30 of the inner blade 28 is cut.

Needless to say, the grass that is further caught in the weight-reducing hole 20 is cut by the auxiliary blade 22 provided in the same manner as in the first embodiment.

[0046]

Fourth Embodiment FIGS. 10 to 12 are drawings of a fourth embodiment, FIG. 10 is a front view, FIG. 11 is a sectional view taken along line XX of FIG. 10, and FIG. 12 is a sectional view taken along line YY of FIG. It is a figure.

The configurations of the outer peripheral blade 10, the rotary blade body 12, the central mounting hole 14, the weight-reducing hole 20, and the auxiliary blade 22 at the edge of the weight-reducing hole 20 of this embodiment are the same as those of the first embodiment. .

This embodiment is characterized in that two types of inner blades 25, 27 are provided on the mounting hole 14 side of the four weight-reducing holes 20.

Of the two types of inner blades 25, 27, one inner blade 25 is apparent with reference to FIG. 12, but is provided in an inverted L shape.

The other inner blade 27 stands upright with respect to the rotary blade body 12.

This embodiment is an example in which two types of inner blades 25 and 27 are provided in combination, but the inverted L-shaped inner blade 25 extends to the outside, so that it can be used at the time of use. Most of the grass to be wound around the mounting shaft side is first cut by the blade tip provided from the base of this inverted L-shaped inner blade 25, and the grass cut by this inner blade 25 is substantially cut. It is cut by the upright inner blade 27 located inside thereof.

Needless to say, the grass that is further wound into the weight-reducing hole 20 is cut by the auxiliary blade 22 that is provided as in the first embodiment.

[0053]

Fifth Embodiment FIGS. 13 to 15 are drawings of a fifth embodiment, FIG. 13 is a front view, FIG. 14 is a sectional view taken along line GG of FIG. 13, and FIG. 14 is a sectional view taken along line HH of FIG. It is a figure. This embodiment also has no change in the essence of the invention as compared with the above-mentioned embodiment. In particular, it has a lot in common with the third embodiment.

In this embodiment, since the rotary blade 32 of this type is made of ordinary steel, heat treatment is performed in production processing. Then, in consideration of production efficiency, it is advantageous to stack and process the layers.

Therefore, in this embodiment, the device is devised so that the two rotary blades 32 can be stacked.

As can be understood by referring to FIG. 13 to FIG. 15, and like the third embodiment, the four lightening holes 20 have two types of triangular shapes when viewed from the front side on the mounting hole 14 side. Blades 26, 28 are provided.

However, these inner blades 26, 28 are provided so as to project from the rotary blade body 12, respectively. Therefore, even if two rotary blade bodies 12 are to be stacked, the protruding inner blades 26, 28 become obstacles, and the inner blade is formed on one surface of the rotating blade 32 provided with the inner blades 26, 28. The other side surface of the rotary blade 32 provided with 26 and 28 cannot be laminated.

Therefore, in this embodiment, as shown in FIG. 13, on the same circumference as the two kinds of inner blades 26, 28, there are two kinds of inner blades 26, 28 between the inner blades 26, 28. A first inner blade insertion hole 34 and a second inner blade insertion hole 36 each having a size corresponding to the front shape are provided.

Thus, in the embodiment, the second rotary blade (not shown) is rotated to the left side in the drawing by about 45 degrees in the drawing so as to be tilted from the front. The inner blade 26, which has a large area when viewed, has a small area when viewed from the front, while the inner blade 28 which is provided upright from the rotary blade body 12 in the adjacent first inner blade insertion hole 34 having a large area has a small area. The inner blade 28 is configured to be inserted into the second inner blade insertion hole 36 having a small area.

Thus, it will be easily understood that the two rotary blades 32 can be laminated.

The configurations of the outer peripheral blade 10, the rotary blade body 12, the central mounting hole 14, the weight-reducing hole 20, and the auxiliary blade 22 at the edge of the weight-reducing hole 20 of this embodiment are the same as those of the third embodiment. .

[0062]

Sixth Embodiment FIGS. 16 and 17 are drawings of a sixth embodiment, FIG. 16 is a front view, and FIG. 17 is a sectional view taken along line P-P of FIG.

This embodiment also has no change in the essence of the invention compared to the previously described embodiments. It is also the same that the mounting hole 14 is provided at the center of the rotary blade body 12, and the outer peripheral blade 10, the weight-reducing hole 20, and the auxiliary blade 22 are provided.

In this embodiment, the inner blade 38 described in the previous embodiment is not provided near the mounting hole 14 of the weight-reducing hole 20, but is provided outside the weight-reducing hole 20, that is, near the outer peripheral blade 10. The point is that it is.

Since the inner blade 38 is provided at a position closer to the outer peripheral blade 10 of the weight-reducing hole 20, the grass cutting scattered on the mounting shaft side due to the winding tightness is caused by the inner blade 38 located outside the light-reducing hole 20. This is an example where consideration is given so that the grass cut into the weight-reducing hole 20 can be suppressed because it plays the role of a screen.

[0066]

Embodiment 7 FIGS. 18 and 19 are drawings of Embodiment 8, FIG. 18 is a front view, and FIG. 19 is a sectional view taken along line JJ of FIG.

The overwhelming majority of the configuration of this embodiment is the same as that of the previous embodiment. An outer peripheral blade 10, a mounting hole 14 at the center of the rotary blade body 12, a weight reducing hole 20, and an auxiliary blade 22 are provided.

This embodiment is characterized in that the inner blades 40, 42 are provided at the mounting hole 14 side of the weight-reducing hole 20 and the outer peripheral blade 10 side, respectively.

In short, by providing a pair of inner blades 40, 42 at opposite positions, the function of cutting the grass to be wound around the mounting shaft twice, the outer inner blade 42 and the inner inner blade 40, twice. Is played. The inner blade 42 and the inner blade 40 are free to have different heights. Furthermore, the inventor also plans to change the height of each of the inner blades 40 and 42.

[0070]

Embodiment 8 FIGS. 20 and 21 are drawings of Embodiment 8, FIG. 20 is a front view, FIG. 21 is a sectional view taken along the line KK of FIG. 20, and FIG. 22 shows a rotary blade 32 of this embodiment. It is a principal part enlarged view in the state which laminated | stacked three sheets.

The outer peripheral blade 10, the mounting hole 14 at the center of the rotary blade main body 12, the weight-reducing hole 20, and the inner blade 44 are provided as in the previous embodiment.

As in the case of the above-described Example 5, this example is designed so that the layers can be laminated for the convenience of thermal processing.

As shown in FIG. 20, a pair of weight-reducing holes 20 are provided on both sides of the mounting hole 14, but both 20 are symmetrical with each other and have a constricted shape. The inner blade 44 is also provided at a symmetrical position of the weight reduction hole 20.

Therefore, because of the above configuration, as is clear with reference to FIG. 22, when the three rotary blade bodies 12 are stacked in the same direction, the adjacent inner blades 44 are adjacent to each other and the weight is reduced. It is inserted into the hole 20.

[0075]

Ninth Embodiment FIGS. 23 and 24 are drawings of a ninth embodiment, FIG. 23 is a front view, and FIG. 24 is a sectional view taken along line LL in FIG.

In this embodiment, the rotation direction of the rotary blade 32 is not restricted when the rotary blade 32 is used.

In the case of the serrated outer peripheral blade 10, it is well known that the rotating direction of the rotary blade is limited to a certain direction depending on the direction of the blade tip.

In this embodiment, what is called a flat blade or a relative blade that can be used by reversing the type of the outer peripheral blade 10 is adopted. In this case, the lightening hole 20 is provided in a circular shape, and the auxiliary blade 22 is provided at the inner edge of the lightening hole 20.

In other words, the shape of the weight-reducing hole 20 is not limited to a circle, but may be an ellipse, and the endless auxiliary blade 22 is provided.

[0080]

[Effect of device]

 Since the present invention has the above-mentioned configuration, it has the following advantages. (1) Although a considerable amount of grass is cut by the outer peripheral blade, it scatters toward the outside of the rotary blade body, but the remaining part scatters on the mounting shaft side after cutting by the outer peripheral blade and around the mounting shaft side. However, these cuttings are not limited to the base of the mounting shaft as well as the base of the mounting shaft due to the inner blade having a serrated cutting edge that is gradually inclined upward from the rotary blade main body in a direction perpendicular to the Even at a height away from, it is surely cut. In particular, since the inner blade is provided in a staircase shape, the rest of the grass is cut along the inclined cutting edge without sliding again by sliding upward.

(2) Since the lightening hole is provided, after the cutting grass is cut by the saw-shaped outer peripheral blade, it scatters toward the outside of the rotary blade main body, but the remaining portion is cut by the outer peripheral blade. , Scatters on the mounting shaft side and tries to wind it around the lightening hole or try to entangle it, but it cuts because the edge of the lightening hole has an auxiliary blade on the side opposite to the rotating direction of the rotary blade. Later grass is cut by this auxiliary blade.

(3) Since the auxiliary blade of the weight-reducing hole has an endless shape, when the outer peripheral edge of the blade is a reversing type, it can be used without any restrictions regarding the rotating direction of the rotary blade, and the weight-reducing hole can be used. The auxiliary blade can cut the cut grass.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a front view of the second embodiment.

5 is a sectional view taken along line CC of FIG.

6 is a cross-sectional view taken along line DD of FIG.

FIG. 7 is a front view of the third embodiment.

8 is a cross-sectional view taken along the line EE of FIG.

9 is a sectional view taken along line FF of FIG.

FIG. 10 is a front view of the fourth embodiment.

11 is a sectional view taken along line XX of FIG.

12 is a sectional view taken along line YY of FIG.

FIG. 13 is a front view of the fifth embodiment.

14 is a sectional view taken along line GG of FIG.

15 is a sectional view taken along line HH of FIG.

FIG. 16 is a front view of the sixth embodiment.

17 is a cross-sectional view taken along the line P-P of FIG.

FIG. 18 is a front view of the seventh embodiment.

19 is a cross-sectional view taken along the line JJ of FIG.

FIG. 20 is a front view of the eighth embodiment.

21 is a cross-sectional view taken along line KK of FIG.

22 is a partially enlarged perspective view showing a state in which the three rotary blades of FIG. 20 are stacked.

FIG. 23 is a front view of the ninth embodiment.

24 is a sectional view taken along line LL in FIG. 23.

[Explanation of symbols]

 10 Outer peripheral blade 12 Rotating blade main body 14 Mounting hole 16 Blade edge 18 Inner blade 20 Lightening hole 22 Auxiliary blade

Claims (3)

[Scope of utility model registration request] 1. A rotary blade body 12 provided with an outer peripheral blade 10.
The inner blade 1 is provided with a saw-shaped blade tip 16 which is gradually inclined upward from the rotary blade main body 12 side with respect to the horizontal rotary blade main body 12 at a constant distance from the mounting hole 14 of the.
A rotary blade for a brush cutter, which is provided with 8. 2. A rotary blade for a brush cutter having a saw blade on the outer peripheral edge and a mounting hole 14 in the center thereof, wherein a weight-reducing hole 20 is provided at a constant distance from the mounting hole 14, A rotary blade for a brush cutter, wherein an auxiliary blade 22 is provided on the edge of the weight-reducing hole 20 on the side opposite to the rotating direction of the rotary blade body 12. 3. A rotary blade for a brush cutter, which is provided with a horizontal outer peripheral blade 10 on its outer peripheral edge and a mounting hole 14 in the center, and is endless and lightweight with a certain distance from the mounting hole 14. Hole 2
0 is provided, and the auxiliary blade 2 is provided on the entire inner peripheral edge of the weight reduction hole 20.
A rotary blade for a brush cutter, wherein the rotary blade is provided with 2.