JP3694106B2 - Engine throttle lever device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to an improvement in the configuration of a throttle lever, a lock lever, and a lock button provided in an operation grip such as a brush cutter or a chain saw.
[0002]
[Prior art]
In conventional brush cutters and chainsaws, the operation grip is equipped with a throttle lever for engine rotation control. In order to prevent the blade and the chain saw 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.
[0003]
Further, when starting the engine, it is necessary to push the throttle lever to the middle position of the movable range so as to be in a half throttle state. For this reason, a lock button is provided in the vicinity of the lock lever of the operation grip, and a throttle lever device is provided that is locked to the throttle lever in the half throttle state and held in this state.
[0004]
The operation grip is divided into left and right parts, and components such as a throttle lever, a lock lever, a lock button, and a spring constituting the throttle lever device are attached to the two constituent members, and then the constituent members are closed to thereby close the throttle. The lever device is assembled. Then, when attaching the above components to two components, the throttle lever is assembled to one operation grip component, the lock lever and the lock button are assembled to the other component, and the two components are assembled to each component. The members were combined and closed.
[0005]
[Problems to be solved by the invention]
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 must be equipped with a spring that urges it to protrude outward from the operating grip. In the work of assembling a small spring, it required fine nerves and skill in hand cutting.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide an engine throttle lever device that solves the above-described problems, has a small number of parts, and is easy to install.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, an engine throttle lever device according to the present invention has a throttle lever and a lock lever that engages and disengages the throttle lever on opposite sides of an operation grip for engine control such as a brush cutter. In addition, a lock button for holding the throttle lever in the half throttle position is disposed in the vicinity of the lock lever, and the throttle lever, the lock lever, and the lock button are provided so as to be able to be pushed into the center side of the operation grip. Forming 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, and the first engaging portion is normally engaged with the lock lever. The lock is released by pushing the lock lever, and the throttle lever is pushed into the half throttle position. When the lock button is pressed, the throttle lever is locked to the second locking portion of the throttle lever to hold the throttle lever at the half throttle position. When the throttle lever is further pressed, In the throttle lever device in which the lock is released, the lock lever is formed of a synthetic resin by folding it back into a U-shape on the grip, and the folding lever is folded into two sides, a side closer to the grip and a side far from the grip. with a grip portion for operating pushing the lock lever side remote from the grip, of the opening portion at both ends of the U-shaped of the locking lever, to form the lock button on the end of the grip portion side, the other end to form an engaging piece for engaging with the first engagement portion of the throttle lever, the grip portion and the lock using the elasticity of the folded portion Characterized by being urged to protrude a button outside the constantly operating grip.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are a perspective view of a brush cutter and an enlarged longitudinal sectional view of the inside thereof, respectively. In this brush cutter, a disk-shaped brush cutter blade 2 is rotatably supported at one end of a main rod 1, and a driving engine 3 for the blade 2 is provided at the other end. The operating grip 4 is provided with a throttle lever device 6 for controlling the rotation of the engine 3.
[0009]
The operation grip 4 is composed of two component members 4a and 4b divided into left and right sides, which are combined and closed from both sides of the main shaft 1 and coupled with a band metal fitting 7 with screws. FIG. 2 shows the internal state of one component member 4a. It is shown. A cavity is formed inside the two components 4a and 4b that are closed together, and the first opening 8, the second opening 9, and the third opening 10 formed in the cavity are formed in the cavity. A throttle lever 11 that controls the engine 3, a lock lever 12 that engages and disengages the throttle lever 11, and a lock button 13 that holds the throttle lever 11 in the half throttle position can be pushed into the center of the operation grip 4, respectively. Is provided. The throttle lever 11 and the lock lever 12 are disposed on the opposite sides of the operation grip 4 (lower and upper in the figure), and the lock button 13 is formed integrally with the lock lever 12.
[0010]
The throttle lever 11 is a member in which the lever portion 11 a and the wire attachment portion 11 b are bent and connected in the middle, and the bent portion is pivotally attached to the support shaft 14 of the operation grip 4. A chord spring 15 is attached to the support shaft 14, and one end 15 a is engaged with the notch 16 of the lever portion 11 a and the other end 15 b is engaged with the recess 17 of the operation grip 4. The lever portion 11a is always urged by the string spring 15 so as to protrude outward. A Tyco receiver 18 is formed at the tip of the wire attachment portion 11b, and a Tyco 19a at the end of the throttle wire 19 is fitted into the Tyco 18. For this reason, the amount of movement of the throttle wire 19 is changed by rotating the throttle lever 11 about the support shaft 14, so that the throttle of the engine 3 can be adjusted and controlled.
[0011]
As shown in FIG. 3, a first locking portion 20 that engages and disengages with the lock lever 12 and a second locking portion 21 that engages and disengages with the lock button 13 are arranged in parallel at the tip of the wire attachment portion 11 b. ing. The 1st latching | locking part 20 is formed in circular arc shape, and the 2nd latching | locking part 21 is formed in protrusion shape.
[0012]
Next, as shown in FIGS. 2 and 4, the lock lever 12 and the lock button 13 are integrally formed of an elastic body made of synthetic resin (polyacetal or the like). The lock lever 12 is configured by forming a locking piece 24 that is locked to the throttle lever 11 via a bearing 23 on one end side 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 disposed in the second opening 9, and the lock button 13 is disposed in the third opening 10. A locking projection 27 is formed at the tip of the lock button 13.
[0013]
The bearing 23 is for bearing 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. In addition, a convex portion 28 that protrudes inward is formed at the opening edge of the second opening portion 9, and this convex portion 28 is located between the folded-back portions 29 of the lock lever 12 so that the lock lever 12 faces outward. Prevents jumping out.
[0014]
According to the above configuration, the grip portion 22 of the lock lever 12 is disposed inside the second opening portion 9 and the lock button 13 is disposed inside the third opening portion 10, whereby the elasticity of the folded portion 29 is increased. The lock button 13 is urged so as to always protrude outward from the third opening 10, and the support shaft 30 is closer to the lock lever 12 than the center of the lock button 13. 22 is always urged by the elasticity of the folded portion 29 so as to protrude outward from the second opening 9.
[0015]
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 is driven by the spring force of the string spring 15 as shown in FIG. The lock lever 12 and the lock button 13 are at the rotation end in the clockwise direction due to the elasticity of the constituent material itself. At this time, the first end of the wire attaching portion 11b of the throttle lever 11 The locking portion 20 is locked to the locking piece 24 of the lock lever 12. In this state, the throttle lever 11 cannot be rotated clockwise, so that the throttle lever 11 cannot be pushed. Therefore, the throttle wire 19 is not pulled.
[0016]
On the other hand, as shown in FIG. 5, the gripping portion 22 of the lock lever 12 is pushed in and rotated counterclockwise, whereby the locking piece 24 and the first locking portion 20 of the throttle lever 11 are moved. The lock is released, the pushing operation of the throttle lever 11 becomes possible, and the throttle wire 19 can be controlled.
[0017]
When the engine 3 is started and kept in the half throttle state, as shown in FIG. 6, the throttle lever 11 is pushed to a position slightly beyond the half throttle, the lock button 13 is pushed, and the throttle lever 11 is further released. Then, since the locking protrusion 27 of the lock button 13 is locked to the second locking portion 21 of the throttle lever 11, the throttle lever 11 cannot return any further and is held at the half throttle position. When the throttle lever 11 is further pushed after the engine 3 is started, the locking projection 27 of the lock button 13 and the second locking portion 21 of the throttle lever 11 are released, and the lock button 13 is made by the elasticity of the material. Since the projection moves outward, the rotation of the engine 3 can be controlled by freely operating the throttle lever 11.
[0018]
When the throttle lever 11 and the lock lever 12 are released during a break after using the brush cutter, the levers 11 and 12 return to the state shown in FIG. 2, so that the throttle lever 11 pushes the lock lever 12. Only after that can the push operation be performed.
[0019]
As described above, in the throttle lever device 6, since the lock lever 12, the lock button 13, and the spring are integrally formed, the number of parts can be reduced as compared with the conventional case.
[0020]
In addition, conventionally, two components (throttle lever and spring) are attached to one component of the operation grip 4, and three components (lock lever, lock button, and spring) are separately attached to the other component. However, since the integrated part may be attached to one of the constituent members together with the throttle lever 11, assembly work such as assembly of the parts and closing of the constituent members becomes much easier.
[0021]
Therefore, according to the throttle lever device 6, it is possible to reduce material and assembly costs.
[0022]
Further, when the lock button 13 is pushed in, the lock button 13 is rotated 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, so that the lock button 13 operates linearly. Therefore, engagement / disengagement with the throttle lever 11 becomes smooth.
[0023]
The lock lever 12 and the lock button 13 are not limited to an example in which elastic synthetic resin is integrally formed in a U shape and the resin material itself is used as elastic means. For example, the lock lever 12 and the lock button 13 are formed separately and connected together, and are urged so as to protrude from the corresponding opening of the operation grip 4 via elastic means such as a spring. Also good. In this case, the elastic means is preferably attached to the lock lever 12 and the lock button 13 integrally in advance.
[0024]
In the above example, the main rod 1 penetrates the operation grip 4, but the operation grip 4 may be attached to the tip of the main rod 1.
[Brief description of the 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 an engine of the brush cutter. FIG. 3 is a perspective view of a part of a throttle lever. FIG. 5 is a cross-sectional view of the throttle lever device when the lock lever is pushed in. FIG. 6 is a cross-sectional view of the throttle lever device when the lock button is pushed.
4 Operation grip 11 Throttle lever 12 Lock lever 13 Lock button 20 First locking portion 21 Second locking portion 24 Locking piece 27 Locking protrusion

Claims (1)

A lock lever that holds the throttle lever in the half-throttle position is located near the lock lever and a throttle lever and a lock lever that engages and disengages the throttle lever with respect to an engine control operation grip such as a brush cutter. A button is provided, and the throttle lever, the lock lever, and the lock button are provided on the center side of the operation grip so as to be able to be pushed in. A second locking portion that engages with and disengages from the button, and the first locking portion is normally locked to a lock lever, and the lock lever is released by a pushing operation of the lock lever. When the throttle lever is pushed into the half-throttle position, the lock button is pushed to engage the second latching portion of the throttle lever. In throttle lever apparatus that holds the throttle lever to half throttle position, engagement between the second engaging portion is disengaged when that further push the throttle lever and,
The lock lever is made of synthetic resin by folding it back into a U shape on the grip, and the lock lever is pushed into the side that is far from the grip out of the two sides that are folded back into the side close to the grip and the side far from the grip. The lock button is formed at the end of the U-shaped open portion of the lock lever at the end of the grip portion, and the first engagement of the throttle lever at the other end. An engine characterized in that a locking piece to be locked to the locking portion is formed and the grip portion and the lock button are constantly urged to protrude outward from the operation grip by using the elasticity of the folded portion. Throttle lever device.

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