JPS5814839Y2 - Kaliharai Kinohogoban - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protection plate for a rotary blade in a portable brush cutter.

As seen in the side view of Fig. 1, the portable brush cutter runs from an engine 1 to a main pipe 2 containing a main shaft.
This is a device that cuts grass, bushes, etc. using a rotary blade 3 attached to the tip of the blade, but because the rotary blade rotates at high speed, pebbles and other small pieces may scatter towards the operator, creating a danger. Therefore, various protective devices are being studied.

Among these methods, the method of providing a protective plate from the main pipe to the rear surface of the rotary blade is simple and highly effective, but the conventional method causes practical inconvenience because the method of fixing the protective plate is insufficient.

In other words, when the protection plate is fixed directly to the main pipe, the impact when the protection plate hits an obstacle, or the impact of the stone on the protection plate when the rotary blade hits a stone and knocks it off, is There is a disadvantage that the impact is directly transmitted to the worker, and if a soft protection plate is hung swingably to absorb such a shock, the protection plate will be unstable and undesirable.

If you try to increase the protective effect by installing a twisted protection plate close to the rotating blade, if it is a fixed type, the blade will be damaged by grass etc., and if it is installed vertically in a swinging type, the protection plate will be damaged. may hit the rotating blade, which is dangerous.

The present invention uses a support rod made of a curved leaf spring when attaching the protection plate, and also takes into consideration the shape of the protection plate.

The drawings show one embodiment of the present invention; FIG. 1 is an overall side view of a brush cutter with a protection plate 4 attached, FIG. 2 is a plan view of a portion of the brush cutter with the protection plate attached, and The figure is an enlarged front view of the support rod and the protection plate, and FIG. 4 is a sectional view taken along the line AA in FIG. 3.

As is clear from these figures, the protection plate 4 is attached to the main pipe 2 with a mounting bracket 6 via a support rod 5 made of a curved leaf spring.

As shown in the drawing, the support rod made of curved leaf springs has two approximately semicircular leaf springs protruding from each other and is installed parallel to both sides of the main pipe.These two curved leaf springs are combined into one wide body. There is no problem even if you make an arc-shaped notch only in the part where the main pipe passes.

Here, when the semicircular curved leaf spring faces the convex curved surface toward the rotating blade, the mown grass and stones absorb the impact appropriately with the elasticity of the support rod and fall downward, causing the rotating blade to Even if the protective plate is placed close to the grass, grass will not get stuck between the protective plates.

Moreover, when pushing the protection plate from the right side in FIG. 4, that is, from the outside, the spring force acts strongly and the protection plate does not come into contact with the rotary blade, making it safe.

As shown in FIGS. 3 and 4, when the rotary blade 2 rotates counterclockwise, the protective plate 4 is extended to the left side from the center, and is designed to be as light and strong as possible at the center and outer periphery. Reinforcing protrusions 7 and 8 are provided on each side, and both sides of the protective plate are bent forward by 15 to 30 degrees so as to wrap around the fixed blade.

As described above, when the protection plate is supported by a support rod made of a curved leaf spring at the rear of the rotary blade of the brush cutter, the protection plate is fixed securely and with appropriate elasticity, so that stones thrown by the rotary blade can be removed. Not only can it accurately prevent debris from flying toward the worker, but it can also alleviate the shock caused by rocks or the like colliding with the protection plate, allowing safe and comfortable brush cutting work.

[Brief explanation of the drawing]

Figure 1 is an overall side view of a brush cutter with the protective plate of the present invention attached, Figure 2 is a plan view of the protective plate, Figure 3 is an enlarged plan view of the support rod and protective plate, and Figure 4 is the third FIG. AA is a sectional view. 1... Engine, 2... Main pipe, 3... Rotating blade, 4... Protective plate, 5...
...... Support rod made of a curved leaf spring, 6... Mounting bracket, 7, 8... Protrusion part for reinforcing the protective plate.

Claims (1)

[Scope of utility model registration request] When attaching the protection plate to the rear of the brush cutter blade, a support rod 5 made of a curved leaf spring with a convex curved surface facing the rotating blade direction is inserted between the main pipe mounting bracket 6 and the protection plate 4. A protection plate for a brush cutter, characterized in that the protection plate 4 is attached close to a rotary blade.