JPH10276530A - Rotating edge for reaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating edge for a reaper facilitating work while surely reaping weeds, etc., and reducing a weight at the time of reaping. SOLUTION: Plural opening parts 8 are formed at a disk-like main body 1 and at the time of reaping, weeds, etc., elastically abutting on the lower face of the main body 1 are projected from these parts 8 and these projected weeds, etc., are reaped by an edge part formed at the inner peripheral faces 9 of the parts 8. In addition a projecting part 10 where air flowing on the upper face of the main body 1 hits at the time of reaping is integrally formed at the edge part of the parts 8 on the upper face of the main body 1 by tilting toward the side of the parts 8 to generate bouyancy at the main body 1. In addition air hitting to the part 10 flows toward the lower face of the main body 1 through the part 8 to add upward force to the lower face of the main body 1 by the air flow of this.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade for a brush cutter that cuts ridges, field weeds, and undergrowth of forests, and more particularly to a disk-shaped main body of the rotary blade for a brush cutter.

[0002]

2. Description of the Related Art Conventionally, a rotary blade for a brush cutter used for a brush cutter includes a metal cutter body (hereinafter referred to as a cutter body) which is a disk-shaped main body and a cutter body for cutting weeds and the like. And a plurality of teeth formed at substantially equal intervals on the outer periphery of the gear. It is to be noted that the teeth are generally used by brazing a carbide tip to the tip and using the carbide tip as a cutting edge.

[0003]

In such a conventional rotary blade for a brush cutter, weeds and the like are cut by high-speed rotation. However, when the weeds and the like have flexibility, weeds and the like are cut off. But, for example, before the carbide tip hits,
It may be pushed down by weeds and the like that have been cut earlier, fall down, and fall under the cutter body. Then, if weeds or the like enter under the cutter body in this way, there is a problem that it is not possible to mow well.

[0004] When weeds and the like are trimmed, the weeds and the like that have been cut off sometimes come to cover the cutter body. When the weeds and the like are overlaid on the cutter body in this way, there is a problem that the overgrown weeds and the like are burned by the heat of the cutter body or wrapped around the mounting portion of the cutter body.

[0005] On the other hand, there has been a problem that a large force is required for operating the brush cutter because the rotary blade for the brush cutter is heavier than before.

Accordingly, the present invention has been made to solve such a conventional problem, and it is possible to reliably cut grass and the like and reduce the weight at the time of cutting. It is a first object of the present invention to provide a rotary blade for a brush cutter that can be used. It is a second object of the present invention to provide a rotary blade for a brush cutter that can prevent weeds and the like from seizing on a cutter body and winding around a portion where the cutter body is attached.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a rotary blade for a brush cutter having a disk-shaped main body and a plurality of teeth formed on the outer periphery of the main body so as to brush weeds and the like. A plurality of openings for projecting weeds and the like elastically abutting on the lower surface of the body at the time of mowing, and cutting the projecting weeds and the like on the inner peripheral surface of the opening. A blade portion is formed.

In the invention, it is preferable that the opening is formed by obliquely punching the main body into an elliptical, circular, triangular or polygonal shape, and the blade is formed by obliquely punching the blade. Characterized in that the inner peripheral surface is inclined.

According to the present invention, the edge of the opening on the upper surface of the main body is integrally formed with a convex portion which is exposed to air flowing through the upper surface of the main body to generate buoyancy in the main body at the time of mowing. It is characterized by the following.

[0010] The present invention also provides an inflow opening through which air flowing through the upper surface of the main body is directed to the lower surface of the main body.
It is characterized in that a buoyancy is generated in the main body by hitting air flowing on the upper surface of the main body, and a guide convex portion for directing the hit air to the inflow opening is inclined toward the inflow opening to be integrally formed.

Further, as in the present invention, a plurality of openings are formed in the disk-shaped main body, and when weeding, weeds or the like elastically contacting the lower surface of the main body are elastically projected from the openings. At the same time, the protruding weeds and the like are cut by the blades formed on the inner peripheral surface of the opening.

Further, as in the present invention, the protrusion to which the air flowing on the upper surface of the main body is hit at the time of mowing is formed integrally with the edge of the opening on the upper surface of the main body by inclining toward the opening side. Try to create buoyancy. Further, the air hitting the convex portion is directed to the lower surface of the main body through the opening, so that an upward force is applied to the lower surface of the main body by the flow of the air.

[0013]

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

FIG. 1 is a plan view of a rotary blade for a brush cutter according to a first embodiment of the present invention. In the figure, A is a rotary blade for a brush cutter (hereinafter referred to as a rotary blade), and 1 is a rotary blade A.
The cutter body 1 has a substantially disc-shaped cutter body. At the center of the cutter body 1, an attachment hole 2 for attaching the cutter body 1 to a drive shaft of a brush cutter body (not shown) is formed. A plurality of teeth 3 are formed on the outer periphery of the cutter body 1 at substantially equal intervals.

Here, the tooth portion 3 has a tip seat 4 at its tip.
Forming a, a bladed teeth 3 ₁ a hard tip 5 is brazed as the cutting edge to the tip seats 4, without forming the tip seats 4,
And it is configured to protect the projection 6 from the blade without teeth 3 ₂ formed.

The protective projection 6 is formed so as to protrude outward by a predetermined amount from the tip of the carbide tip 5 in the radial direction and to protrude downward by a predetermined amount from the lower surface of the carbide tip 5. . The cutting edge of the cemented carbide tip 5 can be protected from stones and gravel by the protective projection 6 at the time of mowing, and the elastic grass is guided to the tip pocket 7 side and cut by the cemented carbide tip 5. You can do it.

On the other hand, in the figure, reference numeral 8 denotes a plurality of, in this embodiment, four, elliptical openings formed in the cutter body 1. Here, by providing such an opening 8, at the time of mowing, as described above, the cutter 8 is pushed down by the weeds or the like cut earlier and falls down, and the cutter body 1 rotates in the direction shown by the arrow B. Weeds and the like that sneak in and abut elastically on the lower surface of the cutter body 1 can be elastically projected on the surface of the cutter body 1.

The opening 8 is formed in an elliptical shape by, for example, inclining the cutter body 1 and punching the cutter body 1 with a cylindrical punch or the like in this state. Here, by punching the cutter body 1 obliquely in this way, as shown in FIG. 2 which is an AA cross-sectional view of FIG. 9b is an inclined surface.

Then, the facing surface 9 of the inner peripheral surface 9 is
By setting the a and 9b as inclined surfaces, at the time of mowing, the opposed surfaces 9a and 9b, actually one opposed surface 9b, act as a blade portion by the rotation of the cutter body 1 and protrude from the opening 8. Weeds and the like are cut.

As described above, when cutting, the cutter body 1
An opening 8 for projecting weeds and the like is formed on the surface of the blade, and a blade portion (one opposing surface) 9b for cutting weeds and the like is formed on the inner peripheral surface of the opening 8 so that the cutter can be used when cutting. Weeds and the like that have sunk under the body 1 can be reliably cut.

By forming the plurality of openings 8 in this way, the weight of the rotary blade A itself can be reduced, so that the operation becomes easier. Furthermore, since the heat radiation effect of the rotary blade A is improved, seizure and winding of weeds and the like can be prevented.

In this way, by preventing the weeds and the like from seizing and winding, it is possible to prevent the horsepower of the engine from being reduced, and to save energy and fuel. In addition, it is possible to save time and effort for removing wrapped weeds and the like, thereby improving work efficiency, eliminating danger during removal work, and ensuring work safety.

In the above description, the elliptical shape of the opening 8 is long along the outer periphery. However, the present embodiment is not limited to this, and the opening 8 may be circular, triangular or polygonal. It may be formed, or may have an elliptical shape that is long toward the mounting hole 2 as shown in FIG. In addition,
As shown in FIG. 4, if the opening 8 is formed so that the long axis direction of the opening 8 and the radial direction of the cutter body 1 are orthogonal to each other, the blade portion (one facing surface) 9b of the opening 8 Comes into contact with weeds and the like at a right angle, and weeds and the like can be cut efficiently.

Further, in order to cover the portion of the cutter body 1 where the weeds and the like abut, the opening 8 may be enlarged as long as the rotary blade A can maintain the strength required for cutting. May be increased. Further, the forming positions need not be formed on the same circumference as shown in FIGS. 1 and 3, but may be formed alternately at positions far from the mounting holes 2 and at positions close thereto.

Next, a second embodiment of the present invention will be described.

FIG. 5 is a plan view of the rotary blade for a brush cutter according to the present embodiment. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

In FIG. 1, reference numeral 10 denotes a protrusion integrally formed on the edge of the opening on the upper surface of the cutter body 1 so as to be inclined toward the opening.
By forming 0 at the edge of the opening 8,
The air flowing on the upper surface of the cutter body 1 hits the convex portion 10 and, as shown in FIG.
Will occur. By generating the buoyancy Pa in this way, the weight of the cutter body 1 during mowing can be reduced, and the operation can be performed easily.

After hitting the projection 10 in this way,
The air is directed from the upper surface 1a to the lower surface 1b of the cutter body 1 via the opening 8. Here, by directing the air to the lower surface 1b of the cutter body 1, air can be blown to the ground (not shown),
By blowing this air, the lower surface 1b of the cutter body 1
Is to receive an upward force. The weight of the cutter body 1 can be reduced by the upward force and the buoyancy Pa, and the operation can be performed more easily.

On the other hand, by providing the projections 10 as described above, even if the cut weeds or the like are overlaid on the cutter body 1, the weeds or the like covered by the projections 10 can be dispelled. Can also be expected. Further, since a gap is formed between the weeds and the like covered by the protrusions 10 and the cutter body 1, the heat of the cutter body 1 is less likely to be transmitted to the weeds and the like, so that the weeds and the like are burned or attached to the mounting portion. Can be prevented from winding around.

By the way, the projection 10 can be formed of a burr that is intentionally generated by, for example, reducing the punching speed when the cutter body 1 is punched obliquely.

The projection 10 is provided on the cutter body 1.
After forming a rectangular opening 8 as shown in FIG. 7 by diagonally punching, the other opposing surface 9b facing the opposing surface 9b serving as the blade is cut and raised as shown in FIG. Can also be formed. Note that, as described above, the protrusion 10
Is formed by cutting and raising, the tip of the convex portion 10 has an acute angle as shown in FIG. 8, and an effect of cutting out overgrown weeds and the like can be expected. The projection 10 is formed by punching the cutter body 1 obliquely and opening the opening 8.
, The other opposing surface 9b side can be formed by bending so as to expand upward.

Next, a third embodiment of the present invention will be described.

FIG. 9 is a plan view of a rotary blade for a brush cutter according to the present embodiment. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

In FIG. 1, reference numeral 11 denotes an inflow opening through which air flowing on the upper surface of the cutter body 1 flows.
Numeral 12 denotes a guide projection integrally formed by being cut and raised between the openings 8 so as to be inclined toward the inflow opening side.

Here, by forming the guide projections 12 in this manner, as shown in FIG.
The air flowing on the upper surface 1a of the
A buoyancy Pa is generated as a component of the contact pressure P.
Then, by generating the buoyancy Pa in this way,
The weight of the cutter body 1 at the time of mowing can be reduced, and the operation can be performed easily.

The air that has hit the guide projection 12 in this way is directed to the lower surface 1 of the cutter body 1 via the inflow opening 12. By directing the air to the lower surface 1b of the cutter body 1, an upward force is applied to the lower surface 1b of the cutter body 1 as in the second embodiment. And
The weight of the cutter body 1 can be reduced by the upward force and the buoyancy Pa, and the operation can be performed more easily.

The guide projections 12 are formed by raising the cutter body 1 after cutting the cutter body 1 at an angle, and thus forming the guide projections 12 according to the second embodiment described above. Like the convex portion 10, the tip portion has an acute angle, and an effect of cutting out overgrown weeds and the like can be expected.

In this embodiment, the inflow opening 11 is not formed in a separate process from the guide projection 12, but is formed by an opening formed in the cutter body 1 when the guide projection 12 is cut and raised. It is composed.

The inflow opening 11 and the guide projection 1
If the cutter blade 2 is formed on the cutter body 1 having the protrusion 10 according to the second embodiment described above, the weight of the rotary blade A at the time of mowing can be further reduced.

[0040]

As described above, according to the present invention, at the time of mowing, weeds and the like elastically contacting the lower surface of the main body from the opening formed in the main body are elastically projected, and the inside of the opening is formed. The protruding weeds and the like can be cut by the blades formed on the peripheral surface, so that the weeds and the like can be reliably cut off.

Also, a convex portion is integrally formed on the edge of the opening on the upper surface of the main body, and air flowing through the upper surface of the main body is applied to the convex portion to give buoyancy to the main body, thereby reducing the weight at the time of mowing. And mowing can be performed easily. Further, by directing this air to the lower surface of the main body and applying an upward force to the lower surface of the main body by the flow of the air, the weight at the time of mowing can be further reduced, and mowing can be performed easily. Become like

Further, by forming an opening in the main body, the heat radiation effect can be improved, and it is possible to prevent weeds and the like from burning and winding.

[Brief description of the drawings]

FIG. 1 is a plan view of a rotary blade for a brush cutter according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of the rotary blade.

FIG. 3 is a view showing another shape of an opening formed in the rotary blade.

FIG. 4 is a diagram illustrating the formation position of the opening.

FIG. 5 is a plan view of a rotary blade for a brush cutter according to a second embodiment of the present invention.

FIG. 6 is a diagram illustrating the flow of air in the rotary blade for the brush cutter.

FIG. 7 is a plan view of another rotary blade for a brush cutter according to the second embodiment of the present invention.

FIG. 8 is a diagram illustrating the flow of air in the rotary blade for the brush cutter.

FIG. 9 is a plan view of a rotary blade for a brush cutter according to a third embodiment of the present invention.

FIG. 10 is a diagram illustrating the flow of air in the rotary blade.

[Explanation of symbols]

 Reference Signs List A Rotary blade for brush cutter 1 Cutter body 1a Upper surface of cutter body 1b Lower surface of cutter body 3 Teeth 8 Opening 9 Inner peripheral surface of opening 9b One opposing surface (blade) of inner peripheral surface 10 Convex 11 Inflow opening 12 Guide convex part Pa Buoyancy

[Procedure amendment]

[Submission date] July 6, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

However, in such a conventional rotary blade for a brush cutter, since the rotary blade for a brush cutter is heavier than the conventional one, a large force is required for operating the brush cutter. There was a point.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

On the other hand, in conventional rotary blades for brush cutters, weeds and the like are cut by high-speed rotation. However, when the weeds and the like have flexibility, the weeds and the like are exposed to, for example, a cemented carbide tip. In some cases, the weeds and the like that have been cut earlier may push the unit and fall, and may fall under the cutter body. Then, if weeds or the like enter under the cutter body in this way, there is a problem that it is not possible to mow well.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

Further, when weeds and the like are trimmed, the weeds and the like that have been cut off may come to cover the cutter body. When the weeds and the like are overlaid on the cutter body in this way, there is a problem that the overgrown weeds and the like are burned by the heat of the cutter body or wrapped around the mounting portion of the cutter body.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

Accordingly, the present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a rotary blade for a brush cutter which can reduce the weight at the time of brush cutting. This is the first purpose. It is also an object of the present invention to provide a rotary blade for a brush cutter that can surely trim weeds and the like, and also prevent seizure of the weeds and the like on a cutter body and winding around a mounting portion of the cutter body. This is the purpose of 2.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

SUMMARY OF THE INVENTION The present invention relates to a rotary blade for a brush cutter having a disk-shaped main body and a plurality of teeth formed on the outer periphery of the main body so as to brush weeds and the like. A plurality of openings are formed in the main body, and a convex portion for generating buoyancy in the main body at the time of mowing is formed at the edge of the opening by hitting air flowing along the main body. is there.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

Further, the present invention is characterized in that a blade portion for cutting the projecting weeds or the like is formed on the inner peripheral surface of the opening.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

In the present invention, the opening is formed by obliquely punching the main body into an elliptical, circular, triangular or polygonal shape, and the blade is formed by obliquely punching the main body. Characterized in that the inner peripheral surface is inclined.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

Further, the present invention is characterized in that the main body is integrally formed with a guide convex portion for causing air flowing along the main body toward the lower side of the main body to generate buoyancy in the main body.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Further, as in the present invention, while a plurality of openings are formed in the main body, a projection integrally formed on an edge of the opening has:
At the time of mowing, buoyancy is generated in the main body by being exposed to air flowing along the main body. Further, the guide convex portion formed integrally with the main body causes air flowing along the main body to be directed downward of the main body so as to generate buoyancy in the main body.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Further, as in the present invention, when weeding, weeds and the like elastically contacting the lower surface of the main body are elastically projected from the plurality of openings formed in the main body, and the inner peripheral surface of the opening is provided. The protruding weeds and the like are cut by the blade portion formed in the above.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

[0040]

As described above, according to the present invention, buoyancy is given to the main body by applying air flowing along the main body to the convex portion formed integrally with the edge of the opening of the main body, thereby making it possible to reduce The weight can be reduced, and the mowing can be performed easily. In addition, the guide convex portion formed integrally with the main body directs air flowing along the main body toward the lower side of the main body to give buoyancy to the main body, so that the weight at the time of mowing can be further reduced, and mowing can be performed. You will be able to do it easily.

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

Further, at the time of mowing, weeds and the like elastically contacting the lower surface of the main body are elastically protruded from the opening formed in the main body, and the blades formed on the inner peripheral surface of the opening form the blade. Since the protruding weeds and the like can be cut, the weeds and the like can be reliably cut.

Claims (4)

[Claims] A rotary blade for a brush cutter, comprising: a disk-shaped main body; and a plurality of teeth formed on an outer periphery of the main body so as to brush weeds and the like. Forming a plurality of openings for projecting weeds and the like elastically contacting the lower surface of the main body,
A rotary blade for a brush cutter, wherein a blade portion for cutting the protruding weeds or the like is formed on an inner peripheral surface of the opening. 2. The opening is formed into an elliptical shape, a circular shape, a triangular shape, or a polygonal shape by obliquely punching the main body, and the blade portion is formed by obliquely punching the inclined body. 2. The rotary blade for a brush cutter according to claim 1, wherein the rotary blade is formed by an inner peripheral surface. 3. A ridge that is formed integrally with an edge of an opening on the upper surface of the main body, which is inclined to the opening side to generate buoyancy in the main body when the air flows on the upper surface of the main body during mowing. The rotary blade for a brush cutter according to claim 1 or 2, 4. An inflow opening for directing air flowing through the upper surface of the main body to the lower surface of the main body, a buoyancy generated in the main body when the air flows on the upper surface of the main body, and the hit air is transmitted to the inflow opening. The rotary blade for a brush cutter according to any one of claims 1 to 3, wherein the guide convex portion to be directed is inclined and formed integrally with the inflow opening side.