JP2000240473A - Throttle regulating device for bush cutter and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lever device for controlling rotation of an engine combining convenience of a friction lever type with safety of a trigger type. SOLUTION: A trigger lever 7 is rotatably mounted on a case 2 fixed at a pipe for the handle of a bush cutter. A drum holder 14 to hold a drum 6 at the end of a throttle regulation wire to regulate rotation of an engine is rotatably mounted on a trigger lever 7 and the drum holder 14 is held at a specified angle with the trigger lever 7. A stopper lever to be engaged with and disengaged in an initial position from the drum holder 14 and a sublever 9 to be engaged with the drum holder 14 and regulate movement of the drum holder 14 in the drawing-out direction of the throttle regulation wire during engagement are mounted on the opposite side to the trigger. A position where the sublever 9 is engaged with the drum holder 14 is regulatable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle adjusting device with good operability in an emergency and a real operation of a throttle for adjusting the rotation of an engine in a brush cutter or the like.

[0002]

2. Description of the Related Art Japanese Patent Application No. 4-66 discloses a throttle adjusting lever device for controlling the rotation of an engine such as a brush cutter.
No. 01, Japanese Patent Application No. 6-24060 and the like, a method called a friction lever type, and Japanese Patent Application Laid-Open No. 9-2967.
A system called a trigger lever type as shown in JP-A-39-39 is known.

[0003] The friction lever type is frictionally held at an arbitrary position, so that it is convenient to work while keeping the engine speed constant. On the other hand, in an emergency, release the hand from the machine. Is also dangerous because the engine speed does not change.

On the other hand, in the trigger lever type, a throttle adjustment wire is connected to the trigger lever,
By operating the trigger lever by hand, the engine speed is increased, and by releasing the hand, the engine is returned to the idling state. Therefore, it is possible to respond quickly in an emergency, but on the other hand, in such a method, if the grip of the trigger lever is too strong, the rotation speed will increase too much, and if it is too weak, the rotation speed will decrease. Therefore, during actual operation, it is necessary to stably adjust the rotation speed of the engine by setting the throttle to the intermediate opening degree, and for that purpose, it is necessary to slightly adjust the strength of gripping the trigger lever. It is necessary to grip the handle pipe by hand and swing it to the left and right for mowing, so continuing to adjust the grip of the trigger lever during that work will impose a heavy burden on the fingers, He was very tired and had to concentrate his attention for a long time, which was accompanied by mental fatigue.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lever device for controlling the rotation of an engine which has both the convenience of a friction lever type and the safety of a trigger lever type.

[0006]

In order to solve the above-mentioned problems, a throttle adjusting device according to the present invention comprises a trigger lever rotatably mounted on a case fixed to a handle pipe of a mower or the like, and a trigger lever. A rotatable tie holder that holds the tie at the end of the throttle adjustment wire that adjusts the rotation of the engine is held rotatably. And a sub-lever for restricting the movement of the tie holder in the pull-out direction of the throttle adjustment wire at the time of engagement is attached, and a position at which the sub-lever engages with the tie holder is adjustable.

It is preferable that the sub-lever is arranged at a position where it can be operated by a thumb.

It is preferable that a stop lever is provided on the opposite side of the trigger from the Tyco holder at an initial position thereof, and the stop lever is always urged in a direction to engage with the Tyco.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a handle pipe provided in a machine such as a brush cutter. A case 2 having a throttle lever device for adjusting the number of revolutions of the engine is fixed to the handle pipe. This case 2 is provided with an engine start button 3 and an introduction portion 5 for a throttle adjustment wire 4. Adjustment wire 4 is outer wire 4
The inner wire 4b is provided inside a, and a tie 6 is fixed to an end of the inner wire 4b. The rotation speed of the engine can be increased by pulling out the inner wire 4b together with the tie 6.

The case 2 is provided with a trigger lever 7, a stop lever 8, and a sub-lever 9.
The trigger lever 7 is rotatably attached to the support shaft 10 of the case 2, and is constantly urged to one offset position (initial position) by a return spring 11 attached to the support shaft 10.

A shaft 13 protrudes outside the rising piece 12 of the trigger lever 7 on the case 2 side, and a Tyco holder 14 is rotatably supported on the shaft 13. Then, a return spring 15 is attached to the shaft 13,
This return spring 15 allows the Tyco holder 14
Is biased to one offset position and is held at a fixed angle with respect to the trigger lever 7. In addition, Tyco holder 1
The tip 6 of the throttle adjusting wire 4 is engaged with and held by the tie 4, and a projection 16 is formed on the outside.

Next, on the opposite side of the trigger lever 7, a stop lever 8 and a sub lever 9 are mounted. The stop lever 8 is disposed so as to face the trigger lever 7, and a shaft 17 provided on the case 2 at an intermediate portion thereof.
An engaging claw 18 is formed on the end of the case 2 so as to be able to swing and to be fitted into the case 6 so as to be detachable from the tie 6. Stop lever 8 is shaft 17
Is always urged in a direction to be engaged with the Tyco holder 14 by a return spring (not shown).

The sub-lever 9 restricts the movement of the tie holder 14 in the pull-out direction of the throttle adjusting wire 4 and is rotatably mounted on a shaft 19 provided in the case 2. The part is operably protruded out of the case 2, and a regulating wall 20 is formed at the other end at a position facing the convex part 16 of the Tyco holder 14. The restriction wall 20 is configured to be able to enter the movement range of the Tyco holder 14 by the rotation of the sub-lever 9. By the way, the sub lever 9
Is not freely rotatable, part of which is case 2
It is set so that it can rotate by applying force by friction.

The Tyco holder 14 is held at a fixed angle with respect to the trigger lever 7 by the spring force of the return spring 15.
Is set to be larger than the pulling force of the throttle adjustment wire 4. As a result, when the throttle adjustment wire 4 is pulled, the trigger lever 7 and the Tyco holder 14 move integrally, so that the stroke amount can be adjusted by operating the throttle adjustment wire 4 by operating the trigger lever 7. .

The spring force of the return spring 15 is set to be smaller than the force for operating the sub-lever 9 against the frictional resistance between the sub-lever 9 and the case 2. That is, when the tie holder 14 is stationary in the middle of the rotation range, the sub-lever 9 is turned to engage the restricting wall 20 with the convex portion 16 of the tie holder 14 and press it, and the return spring 15 is pressed. Even if the hand is released from the sub-lever 9 after pushing the tie holder 14 back, the sub-lever 9 is not pushed back by the spring force of the return spring 15. Further, when the restricting wall 20 of the sub-lever 9 is at a position where it has entered the movement range of the Tyco holder 14, when the Tyco holder 14 moves together with the trigger lever 7 and the projection 16 engages with the restricting wall 20, the trigger lever 7 Is further restricted, the movement of the Tyco holder 14 is restricted, and the Tyco holder 14 cannot follow the trigger lever 7. Therefore, the return spring 15 bends, and the angle between the Tyco holder 14 and the trigger lever 7 changes.

Next, a description will be given of an operation mode of the throttle adjusting device having the above configuration. After the start button 3 is pressed to operate the engine, it is necessary to increase the engine speed in order to rotate the cutting blade. Then, the throttle operation is performed. First, the stop lever 8 and the trigger lever 7 are simultaneously squeezed by hand as shown in FIG. The operation of the stop lever 8 causes the engagement claw 18 and the Tyco holder 14 to move.
And the trigger lever 7 rotates from the initial position to the opposite end. At this time, since the trigger lever 7 and the Tyco holder 14 move integrally, the throttle adjustment wire 4 is pulled out by the entire stroke by the above operation of the trigger lever 7, and the engine speed is increased to the maximum.

Next, when lowering and adjusting the rotation speed of the engine, as shown in FIG. 4, the sub-lever 9 is rotated with the thumb while holding the trigger lever 7 and the protrusion of the Tyco holder 14 is held by the regulating wall 20. 16 and the Tyco holder 1
Only 4 rotates and is pushed back. As a result, the throttle adjustment wire 4 contracts, so that the engine speed decreases.
Release the hand from the sub-lever 9 at the optimum rotation speed. The Tyco holder 14 is held in that position together with the sub lever 9, and the throttle is adjusted optimally.

Although the throttle adjustment is performed by the sub-lever 9, the trigger lever 7 is kept tight.
Therefore, in an emergency, immediately releasing the trigger lever 7 as shown in FIG.
Returns to the initial position by the return spring 11, so that the Tyco holder 14 also follows the trigger lever 7 from the middle, puts the engine in an idling state, and stops the rotation of the cutting blade (not shown). The engaging claw 18 of the stop lever 8 is engaged with the tie 6 of the tie holder 14 that has returned to the initial position,
The rotation of the cutting blade is kept stopped.

Thereafter, when the trigger lever 7 is squeezed again, the Tyco holder 14 also pivots partway, but is again regulated by the regulating wall 20 of the sub-lever 9 and the trigger lever 7 pivots, but the Tyco holder 14 is no longer pivoted. Cannot rotate. Therefore, the rotation of the engine is automatically adjusted to the optimum state before idling as shown in FIG.

Finally, when the mowing operation is completed,
When the hand is released from the trigger lever 7 as shown in FIG. 6, the engine enters the idling state as described above, the rotation of the cutting blade is stopped, and the trigger lever 7 also returns to the initial position by the return spring 11, and the Tyco holder 1
The engagement pawl 18 of the stop lever 8 is engaged with the tie 6 of FIG. Further, the sub-lever 9 may be returned to the initial position when the engine is stopped.

Note that the sub-lever 9 is not necessarily limited to a rotating one. You may comprise so that it may move linearly.

Further, the present invention is not limited to the throttle adjusting device of the mower. It can also be applied to chainsaws, hedge trimmers, cultivators and the like.

As described above, during the operation, the trigger lever 7 may be kept squeezed, and the fine adjustment of the throttle may be performed by the sub-lever 9. In order to operate this machine, the handle must be held in any case, and it is not necessary to change the gripping state, so that the fingers are hardly tired. Also, since there is no need for careful attention, there is little feeling of mental fatigue.

Further, in an emergency, it is only necessary to release the hand from the trigger lever 7, and it is possible to respond quickly.

Further, since the stop lever 8 and the trigger lever 7 are arranged on the opposite sides with one hand, the thumb is released when both levers are gripped and tightened. The sub-lever 9 can be operated with an empty thumb. Therefore, the throttle adjustment operation can be performed with one hand. In addition, since the operation direction of the sub-lever 9 and the adjustment direction of the throttle adjustment wire 4 coincide with each other, malfunction does not easily occur and operability is good.

Further, since the position of the sub-lever 9 can be visually checked from the outside, the adjustment amount of the throttle can be easily confirmed.

When the work is not being performed, the Tyco holder 14 is automatically locked by the stop lever 8, so that an accident is unlikely to occur.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a throttle adjusting device according to the present invention.

FIG. 2 is a cross-sectional view of the throttle adjusting device.

FIG. 3 is an explanatory view showing an initial operation of the throttle adjusting device.

FIG. 4 is an explanatory diagram showing a throttle adjustment mode of the throttle adjustment device.

FIG. 5 is an explanatory view of an emergency operation mode of the throttle adjusting device.

FIG. 6 is an explanatory diagram of the throttle adjusting device at the end of work.

[Explanation of symbols]

 1 Pipe 2 Case 4 Throttle Adjustment Wire 6 Tyco 7 Trigger Lever 8 Stop Lever 9 Sub Lever 14 Tyco Holder

Continuation of the front page (72) Inventor Yuji Okabe 4-4, Momoi, Suginami-ku, Tokyo Starng Industrial Co., Ltd. F-term (reference) 3G065 BA04 CA22 GA46 JA02 JA06 JA11 KA05

Claims (3)

[Claims] A trigger holder rotatably mounted on a case fixed to a handle pipe of a mower or the like, and a Tyco holder for holding a Tyco at an end of a throttle adjusting wire for adjusting rotation of the engine to the trigger lever. Is rotatably mounted, and the tie holder is held at a fixed angle with respect to the trigger lever by a spring. The tie holder is engageable with the tie holder. When the tie holder is engaged, the tie holder is moved in the pull-out direction of the throttle adjustment wire. A throttle adjusting device, wherein a restricting sub-lever is attached, and a position at which the sub-lever is engaged with the Tyco holder can be adjusted. 2. The throttle adjusting device according to claim 1, wherein the sub-lever is arranged at a position operable with a thumb. 3. A stop lever which is disengaged from the trigger holder at an initial position thereof is provided on a side opposite to the trigger lever, and the stop lever is always urged in a direction of engaging with the Tyco holder. The throttle adjusting device for a brush cutter or the like according to claim 1, wherein: