JPS6245550Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shock absorbing device for a handle rod in a brush cutter.

That is, as a shock absorbing device for a handle rod in a conventional brush cutter, there is a technical configuration described in Japanese Utility Model Application Publication No. 51-37532.

However, in this conventional technical configuration, elastic bodies such as rubber are individually provided on each of the connecting rod 5 and the handle 1, and the connecting rod 5 and the handle 1 are fixedly connected to each other. Further, it is necessary to separately provide a holding fitting around the outer periphery of each elastic body, and the holding fittings 2a, 2b are configured to be tightened and fixed with bolts or the like.

For this reason, the structure is complicated, and installation is labor-intensive and expensive.Furthermore, the elastic body such as rubber deteriorates with long-term use, resulting in a reduction in the cushioning effect.

Therefore, in order to solve the above-mentioned conventional problems, the present invention provides a brush cutter in which a handle rod is orthogonally connected to an operating culm that is equipped with an engine and a cutting blade on both ends and has a transmission shaft inside. It has a structure that adequately buffers vibrations generated in the operating culm so that they are not directly transmitted to the handle rod, and in particular can reliably buffer vibrations occurring in the longitudinal direction and vertical direction of the operating culm, and also connects and supports the handle rod well. The present invention provides that the buffering effect does not deteriorate even when used for a long time, and that the structure is simple and easy to manufacture, so that it can be suitably implemented.

Next, the embodiment shown in the drawings will be described.

FIG. 1 shows a side view of the brush cutter with some parts omitted. An engine E, a band hanging fitting 6, etc. are connected to one end side of the operating rod 3 that houses the transmission shaft 2, and a circular ring is attached to the other side. The plate-shaped cutting blades 1, etc. are arranged in series, and a handle rod 4 equipped with grips 4a, etc. on both ends of the operating rod 3 is installed in the upper part of the operating rod 3 so that it can be connected in a direction perpendicular to the operating rod 3. It is constructed in the same way as the shape and structure.

Mounting brackets A and B are fixed to the upper and lower corresponding parts of the handle rod 4 and operation rod 3, respectively.
The mounting bracket B is an upper and lower bracket 7 that can hold the operation stick 3.
a and 7b, and a total of four bolts 8a are inserted into the metal fittings 7a and 7b at the front and rear positions on both sides of the operating rod 3, and the tips of each bolt 8a protrude upward from the upper surface of the upper metal fitting 7a. The washer 9 is fitted to each of the mounting brackets A, and the nuts 8b are screwed together and fixed in place.
are upper and lower metal fittings 10a that can hold the handle rod 4;
10b, and a total of four bolts 11a are attached to the metal fittings 1 on both sides of the handle bar 4.
0a, 10b, and the lower metal fitting 10
A washer 9 is fitted to the tip of each bolt 11a protruding downward from the lower surface of b, and each nut 11b is tightened.
It is configured by screwing them together and fixing them.

Reference numerals 5a and 5b are spring plates having a U-shaped side surface and having a constant width W. Both spring plates 5a and 5b are curved in the longitudinal direction of the operating rod 3 at the front and back of the handle rod 4, and the width W of the spring plates 5a and 5b is The direction of the operation stick 3 is the lateral direction of the operation rod 3, and as shown in FIGS. 8a, 8a and join it to the upper surface of the metal fitting 7a, and each bolt 8a.
a and tighten the nuts 8b, respectively, and insert the bolts 11a, 11a into the holes formed at the upper ends of both spring plates 5a, 5b, and insert the bolts 11a, 11a into the metal fitting 10a.
At the same time as joining the upper surface of each bolt 11a, a nut 11b is screwed onto the lower end of each bolt 11a and tightened.
Both spring plates 5a and 5b are attached and constituted.

FIG. 5 shows another embodiment, which has the same structure as the previous embodiment as indicated by the same reference numerals, but the lower parts of both spring plates 5a and 5b are connected to the upper surface of the lower mounting bracket B as in the previous embodiment. The upper part is attached to the lower surface of the upper mounting bracket A.

FIG. 6 shows another embodiment of the spring plate, in which both spring plates 5a and 5b are formed integrally, the lower part is separated or connected as shown in the drawing, and the upper and lower parts are , the bolt 11a,
Each hole 12 is formed to be inserted into the hole 8a.

Further, FIGS. 7 and 8 show other examples of the spring plate 5a, each formed with a different curved shape, and bolts 11a,
Each hole 13 is formed to be inserted into the other spring plate 5.
b is formed in the same manner.

Therefore, during operation, the grips 4a, 4a on both ends of the handle rod 4 are grasped with both hands, and both spring plates 5a, which curve toward the longitudinal direction of the operating rod 3, are attached at the front and rear of the handle rod 4. ,5
Since the upper and lower parts of b are connected to the mounting brackets A and B, respectively, with the direction of the width W in the lateral direction of the operating stick 3, vibrations occurring in the longitudinal direction and the vertical direction of the operating stick 3 are absorbed by the spring plate 5a. , 5b, and the vibration is not transmitted directly to the handlebar 4, so that the vibration can be operated while swinging the handlebar 4 with little vibration.

As described above, the present invention is a brush cutter in which the handle rod is orthogonally connected to the operation rod which is equipped with an engine and a cutting blade on both ends and has a transmission shaft inside. Mounting brackets are fixedly attached to each of the parts, and spring plates are curved in the longitudinal direction of the operating stick and have a constant width at the front and back of the handle stick so that the width direction thereof is in the lateral direction of the operating stick. Since the upper and lower parts of the handlebar are connected to the two mounting brackets via bolts and nuts, the spring plate effectively damps vibrations generated in the longitudinal direction and the vertical direction of the operating stick, so that the vibrations are not directly transmitted to the handlebar. In addition, the handle rod can be well connected and supported to the operating rod, the structure is simple and easy to manufacture, and the cushioning effect does not deteriorate even when used for a long time. It has the advantage of being suitable for implementation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially omitted side view of a brush cutter, FIG. 2 is an enlarged view of a portion thereof, and FIG. 3 is a view taken along the line - in FIG.
4 is a perspective view taken along the - line in FIG. 2, FIG. 5 is a side view of the main part of another embodiment, and FIGS. 6 to 8 each show other embodiments of the spring plate. E...Engine, 1...Mower blade, 2...Transmission shaft,
3...Operation stick, 4...Handle bar, A, B...Mounting bracket, 5a, 5b...Spring plate, W...Width, 8
a, 11a...Bolt, 8b, 11b...Natsu.

Claims (1)

[Scope of utility model registration request] In a brush cutter that is configured by connecting the handle rod orthogonally to the operation rod that has an engine and cutting blade installed on both ends and a transmission shaft inside, mounting brackets are installed on the upper and lower corresponding parts of the handle rod and operation rod, respectively. fixedly installed, and a spring plate curved in the longitudinal direction of the operating stick and having a constant width at the front and back of the handle stick, with its width direction parallel to the lateral direction of the operating stick, and the upper and lower parts of the spring plate A shock absorbing device for a handlebar, characterized in that it is connected to a mounting bracket through bolts and nuts.