JPH025712Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a hanging device for a brush cutter that can greatly reduce the propagation of vibrations, shocks, etc. to workers during grass cutting operations using a brush cutter. It is something.

[Conventional technology]

A brush cutter used for mowing weeds, lawns, vines, etc. is: (i) For example, as shown in Figure 1, the brush cutter is installed in front of engine E (in Figure 1, the left side is the front and the right side is the rear). A transmission shaft 1 is rotatably supported inside a clutch case C connected to the clutch case C via a bearing (not shown), and the transmission shaft 1 is sequentially attached to a stopper 3 fixed in the middle of an outer tube 2 covering the transmission shaft 1. , while the shoulder strap 7 is connected through the connecting fittings 4, 5, and 6 in a loose state, a handle H having a throttle lever 8 and a stop lever 9 attached to the front of the stoppering fitting 3 is attached to the outer peripheral edge of the outer tube 2. The cutting blade 10 is rotatably mounted on the lower end of a gear housing G that accommodates a gear group (not shown) that can be attached and set at the front end of the gear housing G.

(ii) As another type of brush cutter, a vibration isolating material made of an elastic body is fitted and covered in the middle of an outer tube with an engine at the upper end and a cutting blade at the lower end, and the vibration isolating material is surrounded.・It has also been proposed that the lower end of the shoulder band is fixed to a mounting fixture to suspend the outer tube.

[The problem that the idea attempts to solve]

In case (i) of the methods described in the prior art section, when cutting grass, a worker (not shown) hangs the shoulder strap 7 over his shoulder, grasps the handle 7, and then turns on the engine. When engine E starts, vibrations, shocks, etc. generated by this engine E are not completely absorbed by the vibration isolating material inside the clutch case C, and some of them propagate to the outer tube 2, causing the vibrations and shocks generated by the engine E to be transmitted to the outer tube 2. The vibrations and shocks are transmitted to the shoulder strap 7 through the metal fittings 4, 5, and 6 connected to the metal fittings 3, so that the vibrations and shocks from the shoulders are applied to the entire body of the worker during mowing work. In addition to the noise generated by the engine E, since the stopper 3 is fixed to the outer pipe 2, extra force is required to position the brush cutter in a position that matches the object to be cut, leading to early physical fatigue. As a result, it is virtually impossible to work for a long time, and there are concerns regarding the health management of workers.

In case (ii), although a part of the outer tube is covered with a vibration isolator, all of the vibrations and shocks generated by the engine are not absorbed by the vibration isolator, and some of the vibrations and shocks generated by the engine are not absorbed by the vibration isolator. Since the heat is transmitted to the shoulder strap through the air, there is a problem in that, as in case (i), it causes early fatigue of the worker.

This idea was proposed by focusing on the above-mentioned problems, and its purpose is to reduce the
This greatly reduces the propagation of vibrations and shocks generated by the engine to the worker, and prevents early fatigue of the worker by forming a rotatable suspension part between the outer pipe and the connecting fitting. In addition, it is an object of the present invention to provide a hanging device for a brush cutter that does not make the structure unnecessarily complicated.

[Means to solve the problem]

In order to achieve the above object, the brush cutter suspension device of this invention has a vibration isolator fixed to an outer tube having an engine at one end and a cutting blade at the other end, and is mounted through the vibration isolator. In a brush cutter in which an outer pipe is suspended by a shoulder strap, a substantially annular stopper is fixed to the outer pipe, and a substantially annular stopper is fitted to the outer pipe, and is provided along both sides of the stopper in the circumferential direction. a support body having a recess formed therein; a suspension ring connected to an upper end at a horizontal portion and having a curved portion formed below the support body rotatably fitted in the recess; and a suspension ring that can be engaged with and detached from the horizontal portion. It consists of a shoulder strap and a connecting fitting.

〔Example〕

Examples will be described below with reference to FIGS. 2 to 5. First, in FIGS. 2 to 4 of the first embodiment, a cross section is shown in which the outer tube 21 is in close contact with the outer peripheral edge of the outer tube 21 that covers a transmission shaft (none of which is shown) driven by an engine, and the lower end portion t is open. The front and back of the magnifying glass-shaped stopper 22 (in Fig. 2, the left side is the front and the right side is the rear) are made of a rubber-like material with a highly elastic vibration-proofing function, and the outside of the outer tube 21 is A pair of support bodies 23, 23 fitted loosely or closely together are installed along the peripheral edge, and a curved suspension ring 24 is placed in a recess a having a U-shaped cross section formed at the center of the outer peripheral edge of these support bodies 23, 23. The part d is rotatably fitted, and the lower end of a ring-like connecting fitting 25 is loosely inserted into the horizontal part e at the upper end of the hanging ring 24, and the lower end is inserted into the upper end of the connecting fitting 25. The lower end of the shoulder band B is loosely inserted into the annular connecting fitting 26. The set position of the stopper 22 on the outer tube 21 can be maintained by tightening the end portion t of the stopper 22 with a fastener j such as a bolt or nut.

In FIG. 5 of the second embodiment, the curved portion k of the hanging ring 34 is rotatably fitted into the recess v of the support body 33 in which the left and right annular bodies are integrally connected by the connecting piece 30. Although this embodiment differs from the first embodiment in that a single support body 33 and a suspension ring 34 are combined, the other points are the same, so a description thereof will be omitted.

In the figure, W is a throttle wire, F is a fuel tank, 31 is an outer pipe, and 32 is a connecting fitting.

[action, effect]

Since this idea has the above-mentioned configuration, the first
In the embodiment, a worker with a shoulder band hung over his shoulder grips a handle, starts an engine, and performs cutting work with a cutting blade. Thus, the substantially annular portion of the hanging ring is rotatably fitted into the recess of the support provided along the stopper fastened to the outer pipe, and the horizontal portion of the hanging ring is connected detachably. Since the shoulder strap is attached via the metal fittings, (i) slipping between the outer tube and the stopper is reliably prevented, and the work can be carried out safely without fear of the stopper fitting loosening unexpectedly; .

(ii) The support body interposed between the outer tube and the suspension ring absorbs the vibrations and shocks of the outer tube, and the suspension ring is rotatably fitted through the recess in the support body. Since the outer pipe is rotatable relative to the hanging ring, it is possible to adjust the working position of the brush cutter as appropriate for tasks such as mowing or cutting weeds and branches of trees on slopes. At the same time, the vibrations and shocks of the outer tube are absorbed by the support as mentioned above, so there is no risk of the suspension ring swinging unnecessarily, so the worker can use the shoulder strap in a comfortable position. Since the brush cutter can be held, there is no possibility of early fatigue during work.

(iii) Since the stopper can be tightened in a place where there is less vibration on the outer pipe, it is convenient for the worker to handle it, and the outer pipe of the stopper can be tightened depending on the working conditions and the physique of the worker. positioning, and the overall configuration is not significantly more complicated than conventional equipment of this type.

In the second embodiment, the annular portion of the hanging ring is rotatably fitted into the recess of the support body in which the left and right annular bodies are integrally connected, so that it is different from the first embodiment. Similarly, vibrations and shocks in the outer tube are absorbed by the support and are not propagated to the hanging ring or shoulder band, so that the worker does not become fatigued early during work.

[Brief explanation of drawings]

Figure 1 is a front view of the main parts of a conventional brush cutter, Figure 2
The figure is a vertical sectional view of the main part of the first embodiment of the present product with a part cut away, FIG. 3 is a sectional view taken along the line -0-0 in FIG. 2, and FIG. , FIG. 5 is a longitudinal cross-sectional view of a main part of a second embodiment of the present product, with a portion cut away. 21, 31... Outer tube, 22, 32... Fastener, 23, 33... Support body, 24, 34... Hanging ring, 25, 26... Connecting metal fitting, B... Shoulder band, a, v... ...Concavity, d, k...Curved part, e...
horizontal part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A vibration isolator is fixed to an outer tube that has an engine at one end and a cutting blade at the other end, and the outer tube is attached with a shoulder strap attached through the vibration isolator. In a hanging brush cutter, substantially annular stoppers 22, 32 are fastened to the outer pipes 21, 31, and fittings are fitted into the outer pipes 21, 31 and along both side edges of the stoppers 22, 32. Supports 23, 23, 33 provided with recesses a and v in the circumferential direction, and a horizontal portion e at the upper end.
a curved portion d formed below the
Hanging rings 24, 34 are rotatably fitted into the recesses a, v, and a shoulder band B is provided with connecting fittings 25, 26 that can be attached to and detached from the horizontal part e. Holding device. (2) The suspension device for a brush cutter according to claim 1, wherein the supporting bodies 23, 23, and 33 are fitted to the outer tubes 21, 31 as a pair or as a single unit.