JPS5856348Y2 - Engine brush cutter throttle lever mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a throttle lever mechanism for an engine brush cutter.

Safety improvements for brush cutters are being made under administrative guidance based on the Agricultural Machinery Safety Appraisal Standards.

Among these, it is recommended to adopt a structure in which when the throttle lever for driving the engine is released, the throttle lever automatically returns to its original position.

However, in conventional brush cutters using this method, as shown in Figure 2, the throttle lever 20 must be kept at the intermediate position required for brush cutting work, as shown by the solid line, which can cause hand fatigue. At the same time, the grip 12 at the tip of the handle 4
The disadvantage is that the handle cannot be gripped sufficiently, resulting in poor operability.

Furthermore, during operation, it is easy to accidentally pull the throttle lever 20 to the fully pulled position shown by the chain line, which causes the engine to run at high speed, which is dangerous.

Note that when the throttle lever 20 is released, the throttle lever 20 returns to the position shown by the broken line and the engine speed is reduced.

An object of the present invention is to eliminate the drawbacks of the prior art described above and provide a throttle lever mechanism that is easy to operate.

The present invention focuses on the fact that an elastic body can be deformed and that the greater the deformation, the greater the deformation load.The present invention is characterized in that the throttle lever is made of an elastic body to adjust the amount of pull of the wire. That is.

The present invention will be explained below with reference to illustrated embodiments.

In the figure, 1 is a main rod with a cutting blade 2 attached to its tip, an engine 3 fixed to its rear end, and a long and thin transmission shaft (not shown) connecting the engine 3 and the cutting blade 2. There is.

Furthermore, a handle 4 for swinging the main rod 1 to perform work is fixed to the intermediate portion.

A throttle lever mechanism 5 is attached to the handle 4 and connected to the engine 3 by a wire 6.

An outer tube 8 of a wire 6 is held at a fixed portion 7 of the throttle lever mechanism 5 to the handle 4.

The rear end of the inner wire 10 of the wire 6 and the throttle lever 11 are attached to the connecting member 9 rotatably attached to the fixed part 7.
The lower ends of each are attached.

By grasping the throttle lever 11 together with the grip 12 attached to the tip of the handle 4, the inner wire 10 is pulled to open and close a throttle valve (not shown) that controls the output of the engine 3.

A band 13 fixes the throttle lever mechanism 5 to the handle 4 via the fixing part 7.

α and α' are rotation angles caused by the rotation of the connecting member 9, and are adjusted by the grip of the throttle lever 11.

Next, the operation of the present invention will be explained.

3 to 5, the connecting member 9 is rotatable, and as the rotation angle α of the connecting member 9 increases, the inner wire 10 is drawn longer in proportion to the rotational angle α, and the rotational speed of the engine 3 increases. The inner wire 10 is energized in the direction in which the rotation angle α of 9 is O, that is, in the direction in which the rotational speed of the engine 3 is decreased.

In addition, a throttle lever 11 made of an elastic material such as thin plate spring steel or rubber material that can be deformed by hand grip force is fixed to the connecting member 9 so as to protrude almost parallel to the grip 12. When the throttle lever 11 near the tip is squeezed together with the grip 12, the connecting member 9
The rotation angle α is relatively small, and the rotation of the engine 3 can be kept low.

Furthermore, when the vicinity of the base of the throttle lever 11 is gripped together with the grip 12 as shown in FIG. 5, the rotation angle α' (
α'>α) increases, the rotational speed of the engine 3 increases, and the output increases.

Note that the upper end of the throttle lever 11 may be fixed to or elastically supported by the grip 12.

As described above, the present invention uses a deformable elastic body for the throttle lever, and when the throttle lever and the bundle are fully grasped, the wire can be pulled to the desired amount to give an appropriate engine rotational speed. You won't get tired and the operation will be easier.

In addition, it is safe because it prevents the wire from being pulled too much by mistake, and at the same time, the engine speed can be easily changed by simply shifting the grip position of the bundle and throttle lever up and down.

[Brief explanation of drawings]

FIG. 1 is a side view showing the general configuration of an engine brush cutter, FIG. 2 is a front view showing a conventional throttle lever mechanism, and FIG. 3 is a front view showing an embodiment of the throttle lever mechanism of the present invention. 4 and 5 are explanatory diagrams of the operation of FIG. 3. In the figure, 1 is the main rod, 2 is the cutting blade, 3 is the engine, 4 is the bundle, 5 is the throttle lever mechanism, 6 is the wire, 1
1 is a throttle lever, and 12 is a grip.

Claims (1)

[Scope of utility model registration request] A cutting blade driven by an engine via a long and slender transmission shaft, a handle attached to a main rod holding the transmission shaft for rotating the cutting blade, and a throttle valve for controlling the output of the engine. In the engine brush cutter, the engine brush cutter is equipped with a wire that allows the wire to move, and a throttle lever that is connected to the rear end of the wire and rotatably mounted on the handle, wherein the throttle lever is made of an elongated deformable elastic body; The throttle lever mechanism is configured such that the throttle lever is disposed substantially parallel to the grip of the handle, so that the throttle lever and the grip can be appropriately grasped closely over the entire area thereof.