JPS608202Y2 - Vibration isolating device for the handle attachment part of a brush cutter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration isolating device for a handle attachment part of a brush cutter.

In general, it is said that brush cutters give large vibrations and shocks to the operator during operation, and if used for a long period of time, there is a risk of causing white wax disease.

Therefore, various devices have been developed and provided in order to reduce the vibrations given to the operator when working with a brush cutter, but the most common improvement is the handle attachment part, that is, the part where the operator holds the brush cutter. This relates to the structure of the part that connects the handle rod to the main rod for swinging the rotary blade left and right or front and back.

However, this type of structure currently known is
For example, according to the invention described in Japanese Utility Model Publication No. 52-50110, the handshake that fixes the handlebar is in close contact with the main lever, so even if a vibration isolation space is provided, the vibration transmitted to the main lever will still be absorbed by the handshake. Since the vibrations that are directly transmitted to the handshake and the handshake are directly transmitted to the handlebar via the mounting bracket, the vibration-proofing effect is not as great as that shown in the left.

On the other hand, according to the invention described in Japanese Utility Model Publication No. 52-50106, a support body having a rotation prevention effect is fixed to the main rod, an elastic body is arranged surrounding this support body, and this elastic body is The covering handle bracket is installed so that it does not come into contact with the main rod, but this idea is relatively ineffective in preventing physical vibration transmission since the main rod and handle bracket are not in direct contact but are interposed via a buffer. However, since the structure of the handle bracket is made smaller, the anti-rotation effect becomes stronger.
The supporting force during operation is relatively weak, and since the structure is complex and the number of parts is large, assembly and manufacturing are complicated, leading to complicated processes and high product costs.

In view of these circumstances, the purpose of the present invention is to provide a handle attachment part for a brush cutter that not only increases the vibration-proofing effect but also prevents rotation and increases supporting force, and is easy to assemble and manufacture. It is something to do.

The present invention will be explained below with reference to an illustrated embodiment.
As shown in the figure, 1 is a main rod, and a prime mover 7 is provided at one end of the rod and a rotary blade 8 is provided at the other end.
A drive shaft 9 that connects the rotary blade 8 and the rotary blade 8 is inserted therethrough.

2 to 5, fixed cylinders 5, 5 are closely fixed to the handle attachment portion of the main rod 1 at a constant interval in the axial direction.

As shown in FIG. 6, this fixed cylinder 5 has protrusions 10 on its outer peripheral surface.
The outer surface of the main rod 1 and the tightening part 13.13 are integrally formed with a tightening part 13 which is divided into quarters and provided with a cutout part 12 at one end. Clamp 14
．． It's tight at 14.

Note that the fixed cylinders 5, 5 are not necessary if the buffer bodies 2, 2 are directly fixed to the main rod 1.

Buffer bodies 2, 2 are fitted or adhered to the upper surfaces of the fixed cylinders 5, 5, and this buffer body 2 is made of rubber or a flexible synthetic resin material, and the inside of the buffer body pressers 6, 6, which will be described later. Although it is formed as a single cylindrical unit in the illustrated example, it may be divided in the axial direction or diametrical direction and arranged with appropriate gaps.

Note that the shock absorbers 2, 2 may be attached directly to the main rod 1, and in that case, the shock absorbers 2, 2 may be attached to the main rod 1 with adhesive or without attaching the fixed tubes 5, 5. It may be fixed by baking or by screwing.

A handle attachment ring 3 is disposed on the opposing peripheral edges of the buffer bodies 2, 2, interposed therebetween.

This handle attachment ring 3 has inner circumferential edge stepped portions 4, 4 at both ends,
By fitting the peripheral edge portions of the buffer bodies 2, 2 into the step portions 4, 4, the buffer bodies 2, 2 have a constant distance from the main rod 1, and
are fixedly held at appropriate intervals.

A handle 16 is fixedly supported on the handle attachment ring 3 via bolts 15 and 15.

a shock absorber retainer 6 that covers the outer periphery of the shock absorbers 2, 2 and is integrally connected to the handle attachment ring 3 via four bolts 17;
6 is provided, and this buffer presser 6.6 is connected to a clamp 14.6.
A circular hole 18, 1 is formed on the side of 14 so as not to contact the fixed cylinder 5, 5.
8 is provided to prevent vibrations generated in the main rod 1 from being directly transmitted to the shock absorber holders 6, 6.

By integrally connecting this shock absorber retainer 6°6 to the handle attachment ring 3, the shock absorbers 2, 2 are compressed and sink into the concave portion 11 of the fixed cylinder 5°5, while the protrusion 10 is Because it bites into the shock absorbers 2, 2, the shock absorbers 2, 2 are attached to the fixed tube 5.
, 5, and the buffer pressers 6, 6 are also in close contact with the buffers 2, 2.
Therefore, the handle attachment ring 3 is firmly fixed and rotationally prevented.

Furthermore, by integrally connecting the handle attachment ring 3 and the shock absorber retainers 6, 6, a space 19 is formed between the main rod 1, the handle attachment ring 3, and the shock absorbers 2, 2, and the handle attachment ring 3 is Even if the damped vibrations transmitted from the shock absorbers 2, 2 occur, the vibrations generated in the main rod 1 due to the above-mentioned space with the handle attachment ring 3 are not transmitted.

As described above, according to the present invention, a pair of buffer bodies are arranged at a predetermined interval in the axial direction of the main rod, and the handle attachment ring is interposed and supported between the buffer bodies. By forming a space between the handle attachment ring and the main rod, the contact area between the handle attachment ring and the main rod is minimized to isolate vibrations generated from the brush cutter, resulting in extremely high vibration isolation.

Therefore, the worker can work comfortably without feeling uncomfortable.

Further, since the shock absorber and the shock absorber retainer are arranged in the axial direction of the main rod around the handle attachment ring and are integrally connected, the supporting force of the handle becomes strong.

Furthermore, a fixed tube is arranged between the buffer body and the main rod, and the fixed tube can firmly hold the main rod and the buffer body in close contact, which is highly effective in preventing rotation, and also reduces the size of the device. In addition, the process can be simplified and the product cost can be reduced because the handle mounting ring and the front and rear shock absorber retaining parts can be assembled and manufactured in three parts.

Furthermore, this invention has a vibration isolator on the handle side, so
It has the advantage that the position, angle, etc. of the handle can be adjusted by operating the screw from the outside.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is an overall perspective view of the brush cutter, and Fig. 2 is Fig. 1 showing the structure of the operating rod attachment part.
Figure 3 is a cross-sectional view along the line ■-m in Figure 2, Figure 4 is a cross-sectional view along the line IV--IV in Figure 2, Figure 5 is a cross-sectional view along the line ■-■ in Figure 2, The figure is a side view showing the fixed cylinder. 1... Main rod, 2... Buffer, 3...
...Handle mounting ring, 4...Both ends inner peripheral edge step, 5...Fixed shaft, 6...Buffer retainer,
10... Projection, 11... Concave surface portion, 12
...Notch part, 13...Tightening part, 16.
·····handle.

Claims (1)

[Scope of utility model registration request] A fixed cylinder 5.5 is closely fixed to the outer peripheral surface of the handle attachment part of the main rod 1 at a predetermined interval in the axial direction, and a buffer body 2.2 is fixed to the upper surface of the fixed cylinders 5, 5. , the buffer 2,
The handle attachment ring 3 is interposed between the facing peripheral edges of the shock absorbers 2 and 2, and the shock absorber retainers 6, 6 are integrally connected to the handle attachment ring 3 and cover the outer circumferences of the shock absorbers 2, 2. , the fixed cylinder 5 has a circumferential surface portion 11 having a protrusion 10 on the outer circumferential surface.
and a tightening part 13 having a cutout part 12 are integrally formed, and a space part 19 is formed between the main rod 1, the buffer bodies 2, 2, and the handle attachment ring 3. Anti-vibration device.