JPS5930664Y2 - grass cutting rotary blade - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary mowing blade made of a recyclable synthetic resin material and having a wave-shaped outer circumference.

Generally, mowing rotary blades are made of metal, but
Nowadays, safety regulations are becoming stricter, and products made of urethane-based polymer materials are being put into practical use.

Although mowing performance of rotary mowing blades made of this kind of synthetic resin is lower than that of metal blades, they are safe enough to be used for mowing grass.

Although it is inferior to metal materials in terms of wear resistance, it is characterized by the fact that it can be easily refurbished and repaired.

In view of the above-mentioned advantages and disadvantages of the conventional synthetic resin rotary blade, the present invention has developed a rotary mowing blade that can repair the consumable part by cutting off the blade part that cannot be repaired and regenerates the rectangular shape. The purpose is to provide

The configuration of the present invention will be explained below according to the embodiments shown in the drawings.

Figure 1 shows a lawn mower with an engine 2 attached to the rear of the handle 1.
It has a rotary blade 3 at the front end.

The details of this rotary blade 3 are shown in FIGS. 2 to 4, and it has eight blades made of urethane polymer material.

This rectangle is composed of a straight line portion 4 extending in the radial direction and a curved portion 5 located on the back side and extending to the base of the adjacent straight line portion 4, forming a wave-shaped blade portion.

A through hole 6 is provided near the bottom of this corrugation, a cut line 7 is formed in contact with the through hole, and cutting is performed from the cut line, thereby making the blade portion recyclable.

More specifically, when the rotary blade 3 is rotated at high speed and used, the tip of the blade portion, that is, the apex 8 of the straight portion 4 is worn out and becomes rounded.

This roundness reduces the sharpness of the blade due to scratches, so the roundness is usually removed by lightly contacting the outer periphery of the rotating blade with a rough surface such as a grained file or cleat.

If such repairs by grinding VC are repeated, the outer diameter of the rotary blade will be reduced, and the straight portion 4 will become too short to be usable.

Therefore, in the past, it was possible to repeat such repairs by increasing the height of the blade pattern in advance, but a high blade pattern has the disadvantage of weakening the blade.

Therefore, there is a limit to how large the blade pattern can be, and an economical shape is determined.

The outer diameter of the rotary blade shown in FIG. 2 was determined with these considerations in mind.

What is important to note in this process is that by providing the through hole 6, it is possible to form a new rectangular shape without making the blade pattern higher than necessary.

That is, by cutting and removing a portion of the rotary blade that is no longer needed using the through hole 6 and the cut line 7, the rectangular shape can be regenerated.

Incidentally, the cut line 7 may be formed on both sides of the rotary blade as shown in FIG. 4, or may be formed on one side.

This cutting can be done with a cutting tool such as scissors, and a rotary blade shaped like the broken line in FIG. 2 can be easily regenerated by being guided by the intermittent cutting lines.

This regeneration work can be performed by anyone without the need for special tools or skill.

In addition, the through holes 6 provide flexibility to the blade and can be expected to have a cushioning effect, and also have the effect of preventing damage to the entire rotary blade.

As described above, the configuration of the present invention has practical effects such as providing an economical and safe rotary blade that can be repeatedly used for a long period of time by providing simple processing guidance such as a rotary force meter through hole and a score line. There is something big.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the mower, Fig. 2 is a plan view of the rotary blade, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a side view of the mower. FIG. 2 is a cross-sectional view taken along line IV-N in FIG. 2; 3... Rotating blade, 4... Straight line part, 5...
...Curved portion, 6...Through hole, 7...
... Cut line.

Claims (1)

[Scope of utility model registration request] The outer periphery of the blade is formed into a wave shape, a hole is provided near the bottom of the wave, and an intermittent cut line is provided along the edge of the blade in contact with the hole, and the blade can be regenerated by cutting from this cut line. A rotary mowing blade made of synthetic resin material.