JPH09296739A - Engine throttle lever device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple, easy-to-attach engine throttle lever device. SOLUTION: A throttle lever device has, on its operating grip 4 for controlling an engine such as in a lawn mower, a throttle lever 11 and a lock lever 12 for engaging with or disengaging from the throttle lever 11 which are provided in opposed sides to each other, and a lock button 13 provided in the vicinity of the lock lever 12 for retaining the throttle lever 11 in its half- throttling position. The respective throttle lever 11, lock lever 12 and lock button 13 are pushed or gripped for their operation toward the center of the operating grip 4. The lock lever 12 and the lock button 13 are integrally formed and are urged through an elastic means to always project outward from the operating grip 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an improvement in the structure of a throttle lever, a lock lever and a lock button provided on an operating grip of a brush cutter, a chainsaw or the like.

[0002]

2. Description of the Related Art In conventional brush cutters and chainsaws, an operation grip is provided with a throttle lever for controlling the rotation of an engine. Therefore, when the operator grips the operation grip, the throttle lever is pushed in at the same time. In order to prevent the blades for brush cutting and the chainsaw from being driven, a lock lever is provided on the opposite side of the throttle lever so that the throttle lever cannot be operated unless the lock lever is operated.

Further, when the engine is started, it is necessary to push the throttle lever to an intermediate position in the movable range to keep the half throttle state. For this reason, a lock button is provided near the lock lever of the operation grip, and a throttle lever device is provided to lock the lock button on the throttle lever in the half throttle state and hold it in this state.

The operating grip is divided into two parts, left and right, and the components such as a throttle lever, a lock lever, a lock button, and a spring constituting a throttle lever device are attached to the two components, and then the components are closed. The throttle lever device is assembled. When the above-mentioned parts are attached to the two constituent members, the throttle lever is assembled to one operation grip constituent member, the lock lever and the lock button are assembled to the other constituent member, and the two parts are assembled in the respective states. The parts were joined together and closed.

[0005]

However, when closing the two components, care must be taken so that the assembled parts do not fall off, and each of the above parts projects outside the operating grip. It was necessary to attach a spring that urges like this, and it required a fine nerve and skill for hand-cutting when assembling a small spring.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an engine throttle lever device which has a small number of parts and is easy to install.

[0007]

In order to solve the above-mentioned problems, an engine throttle lever device according to the present invention comprises:
Operate the throttle lever and the lock lever that engages and disengages with the throttle lever on opposite sides of the engine control operation grip of the brush cutter, and operate the lock button that holds the throttle lever at the half throttle position near the lock lever. The throttle lever is provided so as to be able to be pushed in, and the throttle lever is formed with a first engaging portion that engages and disengages with the lock lever and a second engaging portion that engages and disengages with the lock button. The first locking portion is normally locked to the lock lever, and the lock is released by pushing the lock lever, and when the throttle lever is pushed to the half throttle position, the lock button is pushed. Lock the throttle lever in the half-throttle position by locking it with the second locking part of the throttle lever. In the throttle lever device which is configured to be disengaged from the second engagement portion when pushed in, the lock lever and the lock button are integrally formed, and the lock lever and the lock button are provided with elastic means. It is characterized in that it is always urged so as to project to the outside of the operating grip.

[0008]

1 and 2 are a perspective view and an enlarged vertical sectional view of the inside of a brush cutter, respectively. This brush cutter rotatably supports a disc-shaped blade 2 for brush cutting on one end of a main rod 1, and an engine 3 for driving the blade 2 on the other end.
Is provided, and the operating handle 4 and the auxiliary rod 5 are provided on the main rod 1.
And the operation grip 4 is provided with a throttle lever device 6 for controlling the rotation of the engine 3.

The operating grip 4 is divided into two parts, left and right.
The two component members 4a and 4b are closed together from both sides of the main rod 1 and joined to the band fitting 7 with screws. FIG. 2 shows the internal state of one component member 4a. A cavity is formed inside the two component members 4a and 4b which are closed together, and the first opening 8, the second opening 9 and the third opening 10 formed in the cavity are formed. The throttle lever 11 for controlling the engine 3, the lock lever 12 for engaging and disengaging the throttle lever 11, and the lock button 13 for holding the throttle lever 11 at the half throttle position can be pushed into the center side of the operation grip 4, respectively. It is provided in. The throttle lever 11 and the lock lever 12 are arranged on opposite sides (bottom and top) of the operation grip 4, and the lock button 13 is formed integrally with the lock lever 12.

The throttle lever 11 is a member in which a lever portion 11a and a wire mounting portion 11b are bent and connected in the middle, and the bent portion is rotatably attached to a support shaft 14 of the operating grip 4. A helical spring 15 is attached to the support shaft 14, and one end 15a thereof is provided with a cutout portion 16 of the lever portion 11a.
The other end 15b is engaged with the recess 17 of the operating grip 4. The lever portion 11a is constantly urged by the coiled spring 15 so as to always project outward. Wire mounting part 1
A Tyco receiver 18 is formed at the tip of 1b.
A Tyco 19a at the end of the throttle wire 19 is fitted in the. Therefore, the throttle lever 11 is attached to the support shaft 1
The throttle wire 19
Since the amount of movement of the engine changes, the throttle of the engine 3 can be adjusted and controlled.

At the tip of the wire attaching portion 11b, there is further provided a first engaging portion 2 for engaging and disengaging with the lock lever 12 as shown in FIG.
0 and a second locking portion 21 that engages with and disengages from the lock button 13 are juxtaposed. The first locking portion 20 is formed in an arc shape, and the second locking portion 21 is formed in a protrusion shape.

Next, as shown in FIGS. 2 and 4, the lock lever 12 and the lock button 13 are integrally formed by an elastic body made of synthetic resin (polyacetal or the like). The lock lever 12 is configured by forming a locking piece 24 that locks with the throttle lever 11 via a bearing 23 at one end of a grip portion 22 that is folded back in a U shape. Further, the lock button 13 is integrally formed on the other end side of the grip portion 22 via an extension portion 26. The grip portion 22 is arranged in the second opening portion 9, and the lock button 13 is arranged in the third opening portion.
Is arranged in the opening 10. A locking protrusion 27 is formed at the tip of the lock button 13.

The bearing 23 bears the support shaft 30 on the operation grip 4 side, and is arranged closer to the lock lever 12 side than the center of the lock button 13. Further, a convex portion 28 that protrudes inward is formed at the opening edge of the second opening portion 9, and the convex portion 28 is formed by the lock lever 12.
The lock lever 12 is located between the folded-back portions 29 to prevent the lock lever 12 from jumping outward.

According to the above configuration, the grip portion 22 of the lock lever 12 is arranged inside the second opening 9, and the lock button 1
By disposing 3 inside the third opening 10, the elasticity of the folded-back portion 29 is suppressed, and the lock button 13 is set to the third position.
Since the support shaft 30 is closer to the lock lever 12 side than the center of the lock button 13 while being constantly urged to project outward from the opening portion 10, the grip portion 22 is always elastic due to the folding back portion 29. The second opening 9 is biased so as to project outward.

Here, the operation mode of the throttle lever device 6 will be described. In a normal state where the throttle lever 11, the lock lever 12 and the lock button 13 are not operated, the throttle lever 11 has a coiled spring 15 as shown in FIG. The lock lever 12 and the lock button 13 are located at the counterclockwise rotation end due to the spring force, and the lock lever 12 and the lock button 13 are located at the clockwise rotation end due to the elasticity of the constituent materials themselves. The first locking portion 20 is locked to the locking piece 24 of the lock lever 12. In this state, the throttle lever 11 cannot rotate clockwise, so the throttle lever 11 cannot be pushed. Therefore, the throttle wire 19
Is not drawn.

On the other hand, as shown in FIG. 5, the lock lever 1
By pressing the grip portion 22 of the second member 2 and rotating it in the counterclockwise direction, the locking piece 24 and the throttle lever 11 are locked.
The first lock portion 20 of the throttle wire 11 is released, and the throttle lever 11 can be pushed in.
Can be controlled.

When the engine 3 is to be kept in the half throttle state when it is started, as shown in FIG. 6, the throttle lever 11 is pushed to a position slightly beyond the half throttle, and then the lock button 13 is pushed. When 11 is released, the locking projection 27 of the lock button 13 is locked by the second locking portion 21 of the throttle lever 11, so that the throttle lever 11 cannot return any further and is held at the half throttle position. . Engine 3
When the throttle lever 11 is pushed further in after the start, the locking protrusion 27 of the lock button 13 and the throttle lever 1
The lock button 13 is released from the lock with the second lock portion 21, and the elasticity of the material causes the lock button 13 to project outward. Therefore, the throttle lever 11 can be freely operated to control the rotation of the engine 3. it can.

When the throttle lever 11 and the lock lever 12 are released at the time of break after using the brush cutter,
Since these levers 11 and 12 return to the state of FIG. 2, the throttle lever 11 cannot be pushed in until after the lock lever 12 is pushed in.

As described above, in the above-mentioned throttle lever device 6, the lock lever 12, the lock button 13 and the spring are integrally formed, so that the number of parts can be reduced as compared with the prior art.

Moreover, conventionally, two components (throttle lever and spring) are separately provided to one component of the operating grip 4, and three components (lock lever, lock button and spring) are separately provided to the other component. Although the above-mentioned integral parts are attached to one of the constituent members together with the throttle lever 11, the assembling work such as the assembling of the parts and the closing of the constituent members is remarkably facilitated.

Therefore, the above-mentioned throttle lever device 6
According to this, the material and the cost of assembly can be reduced.

When the lock button 13 is pushed, the lock button 13 rotates about the folded portion 29 of the lock lever 12, and the distance between the lock button 13 and the center of the rotation is long. Operate. Therefore, engagement / disengagement with the throttle lever 11 also becomes smooth.

The lock lever 12 and the lock button 13
Is not limited to an example in which an elastic synthetic resin is integrally configured in a U shape and the resin material itself is used as the elastic means. For example, the lock lever 12 and the lock button 13 are formed separately, and they are integrally connected, and each is biased via an elastic means such as a spring so as to project from the corresponding opening of the operation grip 4. Good. In this case, it is preferable that the elastic means is integrally attached to the lock lever 12 and the lock button 13 in advance.

In the above example, the main rod 1 penetrates the operating grip 4, but the operating grip 4 may be attached to the tip of the main rod 1.

[Brief description of drawings]

FIG. 1 is an external perspective view of a brush cutter according to the present invention.

FIG. 2 is a cross-sectional view of a throttle lever device of the engine of the brush cutter.

FIG. 3 is a partial perspective view of a throttle lever.

FIG. 4 is a perspective view of a lock lever and a lock button.

FIG. 5 is a cross-sectional view of the throttle lever device with the lock lever pushed in.

FIG. 6 is a cross-sectional view of the throttle lever device with a lock button pushed in.

[Explanation of symbols]

 4 Operation Grip 11 Throttle Lever 12 Lock Lever 13 Lock Button 20 First Locking Part 21 Second Locking Part 24 Locking Piece 27 Locking Projection

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidenobu Takahashi 4-4-4 Momoi, Suginami-ku, Tokyo Within STARTING Industry Co., Ltd.

Claims (2)

[Claims] 1. A throttle lever and a lock lever for engaging and disengaging the throttle lever are opposite to each other with respect to an engine control operation grip of a brush cutter or the like, and the throttle lever is held at a half throttle position near the lock lever. A lock button is provided on the center side of the operation grip so that it can be pushed and operated, and the throttle lever is provided with a first engaging portion that engages and disengages with the lock lever and a second engaging portion that engages and disengages with the lock button. At the same time, the first locking portion is normally locked to the lock lever, and the lock is released by the pushing operation of the lock lever, and is locked when the throttle lever is pushed to the half throttle position. When the button is pressed, it is locked to the second locking part of the throttle lever to hold the throttle lever in the half throttle position, In a throttle lever device in which the locking with the second locking portion is released when the lever is further pushed, the lock lever and the lock button are integrally formed, and the lock lever and the lock button are elastic. A throttle lever device for an engine, wherein the throttle lever device is urged so as to always protrude to the outside of the operating grip via the means. 2. The lock lever is formed of a synthetic resin by being folded back into a U shape, and a locking piece for locking the first locking portion of the throttle lever is formed at one end of the lock lever, and the other end is extended. The throttle lever device for an engine according to claim 1, wherein the lock button is formed.