JPH08191619A - Mowing rotating blade for preventing grass from twining - Google Patents

Abstract

PURPOSE: To provide a mowing rotating blade capable of preventing grass or bines from twining around a rotating shaft of a bush and grass clearing cutting rotating blade, retaining the durability of the blade capable of preventing the twining therefor and eliminating a danger of falling off and scattering. CONSTITUTION: This mowing rotating blade is obtained by forming notched tooth shapes 5 having root parts 5a forming a gentle chevron shape at an interval on the concyclic orbit in the intermediate part in the radial direction of a plate surface 4a of a bush and grass clearing rotating blade 4, standing the notched tooth shapes 5 perpendicularly to the plate surface 4a and providing teeth 6, capable of preventing the twining and forming tooth parts 5b on the outside upper edges thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotary blade having a large number of saw blades formed in a circumferential direction, which is mounted on a weeding machine and used.

[0002]

2. Description of the Related Art When a round horizontal rotary blade is attached to a rotary shaft at the tip and a mowing machine of a type that operates a handle is used for mowing work, ankles, vines such as legumes, and kaya and rice It is easy for the plant to get wrapped around the rotary shaft and get entangled, and if left alone, it will cause a malfunction. For that reason, he is swinging around the handle to manage to shake off the entangled plants, but he does not feel like it, and there is a risk of causing personal injury. Also, it is extremely difficult to remove grass that has been tightly wrapped.

In order to prevent winding and entanglement of vines on the rotary shaft, a cutting blade is installed upright in the middle of the upper surface of the plate.
Proposals such as -197818 and Japanese Utility Model Laid-Open No. 62-33231 have been made. However, these circular rotary blades have the effect of preventing winding and entanglement of vines on the rotary shaft, but in all cases, the blade die is tacked to the plate surface of the circular rotary blade and fixed by welding. , Metal fatigue progressed due to momentary large load and vibration during work, and finally there was a danger that the welding and tacking parts would be damaged and only the blade die would scatter (dangerous because it scatters in the centrifugal direction).

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and involves winding grass around a rotary shaft of a rotary blade.
It is intended to provide a safe rotary blade for cutting grass which prevents entanglement and prevents the blade die from falling off during use.

[0005]

In order to solve the above-mentioned problems, the present invention forms a cutting blade die 5 in which a root portion 5a forms a gentle mountain shape at a radial center of a plate surface 4a of a mowing rotary blade 4. In addition, the cutting blade die 5 is erected perpendicularly to the plate surface 4a, and the anti-entanglement blade 6 having the blade portion 5b formed on the outer upper edge thereof is provided. Further, a plurality of the entanglement preventing blades 6 are provided at intervals on the same circumferential orbit. Further, the cut hole 8 formed by the cut portion is enlarged from the outer shape area of the cut blade die 5.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a rotary blade for cutting grass according to the present invention is mounted on a rotary shaft 3 of a tip 2a of a handle rod 2 of a weed cutter 1 which is operated by gripping a handle 12. The rotating shaft 3
Is connected to a drive engine 13 via a transmission shaft 10 in the handle rod 2. Further, a scattering prevention cover 11 for stones and the like is attached in the middle of the handle rod 2 behind the mowing rotary blade.

According to the present invention, in the circular grass cutting rotary blade used in the brush cutter 1, as shown in FIG. 3, a radial direction of the plate surface 4a of the brush cutting rotary blade 4 having a large number of saw blades 9 formed on the circumference thereof. A semi-circular linear notch that bulges toward the center at equal intervals on the same circumferential orbit is made in the middle of. Then, make a cut in the shape of a semicircle, bend the cut portion upward, and plate 4
Stand upright to a. The bent base of the bent upright portion is processed into a gentle mountain shape with the intermediate part (root 5a) directed toward the tip to form a cutting blade mold 5, and an outer upper edge portion of the cutting blade mold 5 is formed. The blade portion 5b curved upward is sharpened to form the anti-entanglement blade 6.

If the blade portion 5b is not pointed but curved, it has the effect of reducing the risk of accidental stinging when not in use. The height of the anti-entanglement blade 6 to the tip is preferably equal to the distance between the lowest part of the tip 2a of the handle rod 2 and the plate surface 4a of the anti-entanglement blade 6. Cutting blade type 5
When the grass is not vertically erected with respect to the plate surface 4a but is half-raised obliquely, the effect of cutting off when vines or the like tries to wind around the rotary shaft is small.

[0009] Conventional circular rotary blades have been devised such that a circular punching hole is provided in order to generate frictional heat during use and release this heat. The cut hole 8 formed by bending the semicircular cut portion of the present invention serves as a heat radiation hole for radiating friction heat generated by using the cut hole 8 as it is.
If the cut portion is further enlarged than the outer shape area of the cutting blade die 5, the heat dissipation effect is enhanced.

Further, the entanglement prevention blade 6 is the cutting brush rotary blade 4
Although it is effective to use only one sheet, it is preferable to provide two to five sheets at equal intervals on the same circumference. If too many anti-entanglement blades 6 are used, the resistance will only increase, but the anti-entanglement effect will not increase. On the contrary, it only lowers the strength of the brush cutting rotary blade 4 and increases the manufacturing cost.

[0011]

The present invention is as described above. When the grass or vine or the like is about to be wrapped around the rotary shaft of the brush cutting rotary blade 4 by the entanglement prevention blade 6, that portion is cut. Therefore, winding and entanglement around the rotary shaft are prevented. In addition, the anti-entanglement blade 6 is integrated with the brush cutting rotary blade 4, and the root portion 5a is provided.
Since it has a gentle mountain shape, it can never be removed from the bush cutting rotary blade 4. It is very safe because the blade part cannot fall off and scatter during use.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of the present invention.

FIG. 2 is a vertical sectional side view taken along the line AA of FIG. 3 showing a usage state.

FIG. 3 is a perspective view of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush cutter 2 Handle rod 2a Tip of handle rod 3 Rotating shaft 4 Cutting rotor blade 4a Plate surface 5a Root portion 5 Cutting blade type 5b Blade portion 6 Entanglement prevention blade 7 Mounting hole 8 Cutting hole 9 Saw blade 10 Transmission shaft 11 Anti-scatter cover 12 Handle 13 Drive engine

Claims (3)

[Claims] 1. A cutting blade mold (5) in which a root portion (5a) forms a gentle mountain shape at a radial center of a plate surface (4a) of a brush cutting rotary blade (4), and the cutting blade mold is formed. An anti-entanglement mowing rotary blade comprising an anti-entanglement blade (6) in which (5) is erected perpendicularly to the plate surface (4a) and an outer upper edge portion thereof has a blade portion (5b). 2. The anti-entanglement mowing rotary blade according to claim 1, wherein a plurality of anti-entanglement blades (6) are provided at intervals on the same circumferential orbit. 3. A notch hole (8) formed by a notch part.
Is larger than the outer surface area of the cutting blade die (5), the entanglement prevention grass cutting rotary blade according to claim 1 or 2.