JPH07317577A - Power working machine - Google Patents

Abstract

PURPOSE:To provide a power working machine which performs the cleaning works etc., using an air stream jetted out of a power blower and which allows easy and quick adjustment of the full open position of a throttle valve, by furnishing an adjusting means to adjust the full open position of the throttle valve through restriction of the pivoted motions of a throttle lever. CONSTITUTION:A power blower as a power working machine has a finger setting part 25 for a throttle lever 21 which protrudes down outward from a grip 9 when a throttle valve 17a is in full closed position. On this case, an adjusting means 40 is furnished to restrict an upward pivoting motion of the down tail 26 of the lever 21 toward the full open position so that the throttle valve 17a is opened fully in a noise restricted district etc. and the internal combustion engine is prevented from high speed revolutions. The adjusting means 40 is composed of an adjust screw 41 having a conical tip 41a engaged by the swollen part 51 of a covering part 5 and a cylindrical connection part 42 in which a horizontal part 27a formed at the top of an interlocking member 27 is fitted rotatably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power work machine, and more particularly to a power work machine adapted to perform cleaning work by utilizing an air flow ejected from a power blower driven by a power source of an internal combustion engine. Regarding

[0002]

2. Description of the Related Art As shown in FIGS. 4, 5 and 6, a power blower as an example of this type of power working machine is a small air-cooled two-cycle gasoline engine or the like on the body 1 near one side thereof. Internal combustion engine 2 is provided, and a blower fan 3 is provided near the other side of the machine body 1. Further, a cover 4 is attached to the machine body 1, and the cover 4 has left and right cover portions 5 formed in two parts on both sides.
And 6. The right cover part 5 has a cylinder cover 8 integrally formed on the side thereof and covering the cylinder of the internal combustion engine 2. The both cover portions 5 and 6 are integrally formed with half portions of a hollow handle 9 at their upper joints, and these half portions are connected to each other to form a hollow handle 9 that can be gripped by a user. Form.
The left cover portion 6 is formed so as to cover the blower fan 3, and an air intake opening 10 for taking in external air to the blower fan 3 is formed in a central portion thereof. The air taken in through this opening 10 is
It is pressurized by the blower fan 3 and is ejected to the outside from an ejection port 11 formed by combining the left and right cover portions 5 and 6 at the front part of the machine body 1, and the ejection airflow is used for cleaning work and the like. To be able to do.

As shown in FIG. 6, inside the handle 9, the handle 9 extends in the front-rear direction, and its rear end portion is downwardly curved into a substantially U-shape. A throttle lever 21 integrally molded of resin is stored. The throttle lever 21 is supported at its middle curved portion 22 by a pivot shaft 23 attached to the rear portion of the handle 9 so as to be vertically pivotable. An upper front end portion 24 of the throttle lever 21 extending forward from the pivot shaft 23 is located along the inner space of the handle 9 and is elongated in the front-rear direction formed at the lower joint of the handle 9. Finger hook 2 protruding downward from the slot 16
5 are integrally formed. On the other hand, the lower rear end portion 26 that is folded back toward the front of the throttle lever 21 is short.
Is arranged near the upper end inside the machine body 1 and is connected to a throttle valve 17a of the carburetor 17 (which will be represented by its rotating lever in the following description) by an interlocking member 27 such as a linkage rod. .

The throttle valve 17a is used for the carburetor 1
7 is pivotally mounted in a venturi (not shown), and is constantly biased by a spring (not shown) to an idling position for maintaining a minimum opening required to maintain the idling state of the internal combustion engine 2. Normally, it is held at that position (hereinafter referred to as the fully closed position). In this way, the throttle lever 21 is normally in the position shown by the solid line in FIG. 6, and the finger hook portion 25 of the upper front end portion 24 of the throttle lever 21 is in the position protruding downward from the handle 9. Has been maintained. When the output of the internal combustion engine 2 is increased to operate the blower fan 3, the index finger of the hand holding the handle 9 pulls the finger hook portion 25 of the throttle lever 21 upward to pull the throttle lever. By pivoting 21 toward the operating position shown by the phantom line in FIG. 6, the opening degree of the throttle valve 17a is increased and the amount of the air-fuel mixture sent to the cylinder of the internal combustion engine 2 is increased. It has become.

[0005]

In the prior art as described above, when the output of the internal combustion engine is increased during use of the power blower, until the finger-holding portion of the throttle lever is completely immersed in the handle with the fingers. The throttle valve was fully opened by operating the throttle. However, when the throttle is fully open, noise is generated due to high engine speed.Therefore, in areas with severe noise restrictions, avoid operating with the throttle opening fully open, and suppress noise by restricting the rotation of the internal combustion engine. There is a need to. for that reason,
While the worker pays close attention to the amount of pulling operation of the finger rest of the throttle lever, he also operates the throttle lever so as not to open the throttle fully, but it requires skilled operation technology. It was insufficient as a noise countermeasure.

On the other hand, in order to control the engine speed,
For example, it is possible to regulate the opening of the throttle valve by adjusting the adjuster attached to the carburetor itself.
Adjusting the carburetor, which can be said to be the heart of the internal combustion engine at the user stage, could lead to an accident if you make a mistake.
Moreover, the manufacturer cannot guarantee the safety, which is not desirable as a noise countermeasure.

The present invention has been made in view of such a problem, and an object thereof is to maintain the characteristics defined by the carburetor, and to quickly open the fully open position of the throttle valve. (EN) Provided is a power working machine that can be easily adjusted, has a simple structure, and can maintain a stable rotation speed with less noise by a simple operation.

[0008]

In order to achieve the above object, a power working machine according to the present invention basically comprises a machine body having an internal combustion engine, and a hollow handle formed in the machine body. And a substantially U-shaped throttle lever which is pivotally attached to the rear end of the handle and extends in the handle in the direction of the front end thereof and a lower rear end extending in the body. A finger hook portion protruding from the handle to the outside is integrally formed at the front end portion, and the lower rear end portion is connected to a throttle valve of the internal combustion engine by an interlocking member, and the throttle valve is in a fully closed position. In a power working machine in which the finger hook portion of the throttle lever is sometimes held at a position protruding from the handle to the outside, the pivotal movement of the throttle lever is restricted to adjust the fully open position of the throttle valve. It is characterized by comprising adjustment means for.

More specifically, the adjusting means is provided so as to be capable of contacting the throttle lever in the vicinity of the throttle fully open position, and is capable of adjusting the amount of movement of the throttle lever to the throttle fully open position. It is preferable that the throttle lever is formed of a synthetic resin, which is characterized by including a screw.

[0010]

[Operation] In the power working machine according to the present invention configured as described above, when the output of the internal combustion engine is increased from the idling position in the noise control area, the worker completely immerses the finger hook in the handle. The throttle lever movement is regulated by the adjusting means even when the throttle lever is fully pulled down to the position where it is fully closed, and the cushioning action of the throttle lever allows the operator to pull the finger at a constant pulling amount without adjusting the pulling operation amount. The throttle valve can be fully opened by the throttle amount.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In addition, in the drawings for explaining the embodiment, FIG.
The same reference numerals are given to the portions corresponding to the respective portions of the conventional technique shown in 6, and their duplicate description will be omitted.
The differences from the prior art will be mainly described.

FIG. 1 is a right side perspective view of an embodiment according to the present invention, FIG. 2 is a longitudinal sectional view of an enlarged main part of the embodiment of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of FIG. . In the power blower as the power working machine of the illustrated example, the lower rear end portion 26 of the throttle lever 21 is in the throttle fully open position so that the throttle valve 17a does not fully open and the internal combustion engine 2 does not rotate at high speed in the noise regulated area. Adjusting means 40 is provided for restricting further upward pivoting from near to the fully open position. The adjusting means 40 includes an adjusting screw 41 having a conical tip portion 41a screwed into a bulging portion 51 formed near the upper end portion of the right cover portion 5, and a lower rear end of the throttle lever 21. Part 2
6, a cylindrical connecting portion 4 in which a horizontal portion 27a formed at the upper end portion of the interlocking member 27 is rotatably fitted and inserted.
It consists of 2.

Next, the operation of the power working machine according to the embodiment of the present invention thus constructed will be described. When the output of the internal combustion engine 2 is increased in order to operate the blower fan 3 from the idling position shown by the solid line in FIG. 2 in a noise regulated area or the like, the throttle with the index finger of the hand holding the handle 9 is used. The finger hook portion 25 of the lever 21 is fully squeezed upward so that the throttle lever 2
1 is pivoted towards the operating position shown in phantom in FIG.
At this time, as can be seen from FIG. 2, even if the operator pulls the finger-holding portion 25 to the position where the finger-holding portion 25 is completely retracted into the handle 9, the connecting portion 42 causes the tip of the adjusting screw 41 to squeeze. When the throttle lever 21 comes into contact with the lower surface side of the portion 41a to restrict further pivotal movement, the throttle lever 21 itself made of synthetic resin having appropriate elasticity is appropriately bent to reach the regulated noise value. It can be avoided that the throttle is fully opened.

On the other hand, when the output of the internal combustion engine 2 is to be fully increased (to the throttle fully open state originally possessed by the carburetor) in an area where noise is not regulated, the screwing of the adjust screw 41 is returned. (Move to the right in FIG. 3) so that the connecting member 42 does not contact the adjusting screw 41 when the throttle lever 21 pivots upward. The upper limit rotational speed can be changed as appropriate by adjusting the position of the tip portion 41a to the middle thereof.

As described above, the throttle fully opened position can be adjusted by the buffering action of the adjusting means 40 and the throttle lever 21, so that the operator does not have to adjust the pulling operation amount of the finger-holding portion 25, but it is always constant. The finger hook 25 can be operated by the amount of pulling. Also, since the user does not adjust the carburetor that has been tuned carefully by the manufacturer, safety is guaranteed.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various design changes can be made without departing from the present invention described in the claims. It can be performed. For example, the present invention is not limited to the power blower, and it goes without saying that the present invention can also be used in models such as chain saws and brush cutters that operate an internal combustion engine with a throttle lever.

The material of the throttle lever is
It is needless to say that the material is not limited to the synthetic resin, and any material having appropriate elasticity and flexibility can be used.

[0018]

As can be understood from the above description, according to the present invention, the characteristics defined by the carburetor can be maintained, and yet the fully open position of the throttle valve can be adjusted quickly and easily. In addition, the structure is simple, and it is possible to maintain a stable rotation speed with less noise by a simple operation.

[Brief description of drawings]

FIG. 1 is a right side perspective view of a power work machine according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of an essential part of the power working machine shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a right side perspective view of a conventional power working machine.

5 is a left side view of the power work machine of FIG. 4. FIG.

6 is a longitudinal sectional view of an enlarged main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airframe 2 ... Internal combustion engine 9 ... Handle 17a ... Throttle valve 21 ... Throttle lever 24 ... Front end 25 ... Finger hook 26 ... Lower rear end 27 ... Interlocking member 40 ... Adjusting means 41 ... Adjust screw

Claims (3)

[Claims] 1. A machine body 1 provided with an internal combustion engine 2, a hollow handle 9 formed on the machine body 1, and a rear end portion of the handle body 9 pivotally attached to the inside of the handle body 9 toward a front end portion thereof. A throttle lever 21 having a substantially U-shaped configuration including a front end portion 24 extending to the inside of the body 1 and a lower rear end portion 26 extending to the inside of the machine body 1, and a finger hook protruding from the handle 9 to the outside at the front end portion 24 of the throttle lever 21. The part 25 is integrally formed, and
The lower rear end portion 26 is connected to the throttle valve 17a of the internal combustion engine 2 by an interlocking member 27.
In a power working machine in which the finger hook portion 25 of the throttle lever 21 is held in a position in which the finger hook portion 25 of the throttle lever 21 is projected to the outside from the handle 9 when the throttle lever 7 is in the fully closed position, the pivotal movement of the throttle lever 21 is restricted. Adjusting means 40 for adjusting the fully open position of the throttle valve 17a
Powered working machine characterized by having. 2. The adjusting means 40 is provided with an adjust screw 41 which is provided so as to be able to contact the throttle lever 21 in the vicinity of the throttle fully open position and which is capable of adjusting the amount of movement of the throttle lever 21 to the throttle fully open position. The power working machine according to claim 1, further comprising: 3. The power working machine according to claim 1, wherein the throttle lever 21 is made of synthetic resin, and the front end portion 24 side has appropriate elasticity.