JPH0216583Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a brush cutter for mowing grass, etc. on the ground using a rotating rotary blade. This relates to a connecting pipe that connects an engine and a bearing body that supports the shaft.

(b) Prior Art Conventionally, the connecting pipe of this type of brush cutter is made of an aluminum alloy pipe, and as shown in FIGS. 4 and 5, a transmission shaft 29 passes through the inside, and this transmission shaft
In order to support the intermediate position of the bearing bush 33 made of synthetic resin, a plurality of ribs 35, 3 made of rubber etc.
5,... is fitted into the ring body 37, and this rib 35
was fitted into the inner diameter portion of the connecting pipe 31.

(c) Problems that the invention aims to solve In conventional connecting pipes, this bushing 3
3 into the ring body 37 and the ring body 37 into the inner diameter of the connecting pipe 31, and the ring body 37 with the ribs 35 cannot be made of rubber, synthetic resin, etc. However, it was not possible to make it inexpensive, including the manufacturing cost of the mold. Furthermore, depending on the type of work, connecting pipes may bend or become insufficient in strength, but with conventional configurations, it is necessary to increase the wall thickness or diameter of the pipe, but increasing the wall thickness also increases the weight. The strength does not increase as compared to the increase in the diameter, and increasing the outer diameter has disadvantages such as difficulty in gripping.

(d) Means for solving the problem In order to solve the above-mentioned drawbacks, the present invention forms a connecting pipe by forming an outer pipe and an inner pipe provided in the center into one body through a plurality of ribs. It can be easily formed into a lightweight, strong shape by extrusion molding of aluminum alloy, and the inner diameter surface of the inner pipe in contact with the transmission shaft is equipped with a bearing. A wear-resistant synthetic resin bushing can be inserted to prevent wear.

(e) Effect In this invention, a tubular bush made of synthetic resin is inserted into the inner pipe, and a transmission shaft is rotatably supported inside the bush to transmit the engine power to the rotary blade. The operator grasps the handle provided at an appropriate position on the connecting pipe with both hands and uses the rotary blade to cut grass, etc. on the ground.

(f) Example In the figure, the brush cutter 1 is constructed as follows. That is, the rotary blade 5 is rotatably supported on the bearing body 3, and the bearing body 3 and the engine 7 are connected by a connecting pipe 9. Connecting pipe 9
A handle 11 is fixed at an intermediate position, and grips 13, 13 are fixed to both ends of the handle 11. A cover 15 connects the connecting pipe 9 behind the rotary blade 5.
It is stuck to. Near the rear end of the connecting pipe 9,
A hanger 17 for locking a shoulder band (not shown) and a buffer body 19 for preventing the worker's waist from colliding with the connecting pipe 9 are attached. The connecting pipe 9 is constructed as follows. That is, the inner pipe 23 has a plurality of ribs 25, 25,
It is molded into one body with the outer pipe 21 through extrusion molding. A tubular bearing bush 27 made of synthetic resin is inserted into the inner diameter of the inner pipe 23 to rotatably support a transmission shaft 29 passing through the interior.

(g) Effects of the invention Since the invention has the configuration as described in the claims, it can be formed by extrusion molding of aluminum alloy, and can be manufactured easily and at low cost. It is. Furthermore, since it is assembled by inserting a tubular bush, the assembly work is easy and wear resistance can be maintained. It is also lightweight and has high strength against bending.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view of a brush cutter, Figs. 2 and 3 are a side sectional view and a front sectional view of an embodiment of the present invention, respectively, and Figs. 4 and 5 are side sectional views of a conventional example, respectively. , is a front cross-sectional view. 3... Bearing body, 5... Rotating blade, 7... Engine, 9... Connecting pipe, 21... Outer pipe, 23
...inner pipe, 25...rib, 27...butsuyu.

Claims (1)

[Scope of utility model registration request] The connecting pipe 9 connecting the engine 7 and the bearing body 3 that rotatably supports the rotary blade 5 is connected to the outer pipe 2.
1 and an inner pipe 23 provided at the center are formed into one body via a plurality of ribs 25, 25, and a bush 27 made of synthetic resin for a tubular bearing is provided on the inner diameter of the inner pipe 23. A connecting pipe for a brush cutter characterized by being inserted into the connecting pipe.