JP3793285B2 - Throttle operating device for power working machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throttle operating device for a power working machine such as a brush cutter, and in particular, a handle and a grip member are provided, and the throttle lever can be turned in a direction approaching or moving away from the grip. The present invention relates to a throttle operating device for a power working machine supported by the machine.
[0002]
[Prior art]
Conventionally, such a throttle operating device is already known, for example, from Japanese Patent Publication No. SHO 57-19196, Japanese Utility Model Publication No. 3-11387, Japanese Utility Model Publication No. 57-50506, and the like.
[Problems to be solved by the invention]
By the way, in a general brush cutter, when an operator removes his / her hand from the throttle lever while using the brush cutter, the throttle lever returns to idle rotation of the engine in consideration of safety. However, a configuration for adjusting the rotational position of the throttle lever to maintain the engine speed at an intermediate value between the idle speed and the maximum speed has not been realized. Even in the brush cutter disclosed in Japanese Utility Model Publication No. 3-11387, such a configuration is not disclosed.
[0003]
On the other hand, in the brush cutter disclosed in Japanese Utility Model Publication No. 57-50506, an adjustment member is mounted on the throttle lever so that the throttle lever can be moved along its longitudinal direction, and the adjustment member is brought into contact with the grip. The rotation position is adjusted. However, since the adjustment member is moved along the longitudinal direction of the throttle lever, it is difficult to move the adjustment member to change the rotation position of the throttle lever while using the brush cutter. It is difficult to change the rotation position of the throttle lever on the way.
[0004]
The present invention has been made in view of such circumstances, and has a compact structure in which the rotation position of the throttle lever can be easily adjusted at least in the working rotation range when the worker is using the power working machine. Another object of the present invention is to provide a throttle operating device for a power working machine which is configured simply and easily.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a power operation in which a grip and a support member are provided on a handle, and a throttle lever is supported by a support member so as to be able to rotate in a direction approaching and separating from the grip. In the throttle operating device of the machine, the support member is a box-shaped part that rotatably supports the throttle lever, a neck part that is connected to the box-shaped part, and projects from the neck part to the outside and adjacent to the end part of the grip. An adjustment member for abutting the throttle lever to adjust the rotation position of the throttle lever so as to be adjustable is substantially orthogonal to the longitudinal direction of the grip. fitted as operable in a plane, the adjustment member, together with both ends in sliding contact with the respective box-shaped section and ChoIzurutsuba portion of the support member, both inner side surfaces of the adjustment member and At least one of both outer surfaces of the portion is provided with an uneven portion for generating a frictional force between the outer surfaces, and the frictional force is adjusted when the operator applies a normal operating force to the throttle lever. operating position does not change, also is characterized in that is sized to the operating position of the adjustment member can be easily changed when adding a large operating force than the normal operating forces, the support member and the throttle A compact configuration in which at least a part of the adjusting member is arranged in the dead space generated between the lever and the dead space is effectively used, and at least in the working rotation area by the adjusting member without releasing the hand from the grip. possible of easily adjusting the throttle opening as ing. Moreover , when the operator applies a normal operating force to the throttle lever, the operating position of the adjusting member does not change, and when an operating force greater than the normal operating force is applied, the operating position of the adjusting member easily changes. Therefore, it is easy to change the throttle opening by operating the adjustment member when using the power working machine .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view of a brush cutter in a used state, FIG. 2 is a side view of the brush cutter, and FIG. 3 is an end portion of a right handle. 4 is an enlarged longitudinal sectional view, and FIG. 4 is a sectional view taken along line 4-4 of FIG.
[0007]
First, in FIG. 1 and FIG. 2, a brush cutter as a power working machine includes an operating rod 11 made of a pipe, and a power unit 12 including an engine, a fuel tank, and the like is provided at the rear end of the operating rod 11, A drive shaft (not shown) connected to the power unit 12 is rotatably housed in the operation rod 11. The tip of the operation rod 11 covers a gear case 13 having a built-in gear mechanism whose input end is connected to the drive shaft, a cutting blade 14 provided at the output end of the gear mechanism, and a rear side of the cutting blade 14. A cover 15 is provided.
[0008]
A handle 16 is fixed to the rear intermediate portion of the operation rod 11 via a connection fitting 17. The handle 16 includes a connecting portion 16a extending from both sides of the connecting bracket 17 and left and right handle portions 16b and 16c rising upward from both ends of the connecting portion 16a. The operator can hold the left and right handle portions 16b and 16c with the left and right hands, respectively. Further, a metal fitting 19 is fixed to the operation rod 11 between the connecting metal fitting 17 and the power unit 12, and the metal fitting 19 is used for the operator to hang the brush cutter on his shoulder as shown in FIG. A suspension band 18 is connected.
[0009]
In FIG. 3, a grip 20 made of an elastic material such as rubber and a support member 21 ₁ made of a synthetic resin are provided at the end of the right handle portion 16 c of the handle 16, and approach and separate from the grip 20. The throttle lever 22 is supported by the support member 21 ₁ so as to be rotatable in the direction.
[0010]
The grip 20 is provided with a handle insertion hole 23 into which the right handle portion 16c is fitted and a wire insertion hole 24 into which the throttle wire 25 is inserted over the entire length in the longitudinal direction. The portion is fitted into the handle insertion hole 23 so that the end surface thereof is flush with the outer end surface of the grip 20, and the relative position of the grip 20 and the right handle portion 16 c is maintained by the elastic force of the grip 20. . In addition, when the grip 20 is attached to the end of the right handle portion 16c, the wire insertion hole 24 is disposed on the rear side (right side in FIG. 3) of the right handle portion 16c.
[0011]
The support member 21 ₁ has a rectangular box-shaped portion 26 is hollow, and neck 27 ₁ of the cross-section rectangle continuing to lower the該函shaped portion 26, overhangs outward from the lower end of該首27 ₁ Zhang Detsuba A first fitting protrusion 29 projecting downward from the overhanging flange 28 so as to be fitted to the end portion of the right handle portion 16c, and an overhanging collar capable of fitting into the wire insertion hole 24 of the grip 20. And a second fitting protrusion 30 protruding downward from the portion 28. The support member 21 ₁ inserts the first and second fitting protrusions 29 and 30 into the right handle portion 16c and the wire until the overhanging flange portion 28 contacts the end surface of the right handle portion 16c and the outer end surface of the grip 20. When both ends of the pin 31 penetrating the first fitting protrusion 29 along the one diameter line are engaged with the side wall of the right handle portion 16c in the state of being fitted in the hole 24, the right handle portion 16c. It is fixed to the end. In addition, the engaging portions of the both ends of the pin 31 to the right handle portion 16c are covered by the grip 20 in which the right handle portion 16c is fitted, and the detachment of the pin 31 from the right handle portion 16c is prevented by the grip 20. Is done.
[0012]
The throttle lever 22 is disposed on the front side of the grip 20 (left side in FIG. 3), and a window 32 through which a portion near the base end portion of the throttle lever 22 can be rotated is penetrated. Provided on the front surface of the portion 26, the base end portion of the throttle lever 22 is rotatably supported by a support shaft 33 that is fixedly provided between both side walls of the box-shaped portion 26. As a result, the operator who holds the grip 20 can turn the throttle lever 22 in a direction in which the grip 20 approaches or separates from the grip 20.
[0013]
In the box-shaped portion 26, a connecting arm 34 extending rearward is integrally connected to the proximal end portion of the throttle lever 22, and the throttle wire 25 is connected to the rear end portion of the connecting arm 34.
[0014]
Throttle wire 25 is for inner wire 25 _I is formed by inserting movably the outer wire 25 in _O, the outer wire 25 _O is the end to the second fitting projection 30 of the support member 21 ₁ It is inserted from below into the wire insertion hole 24 of the grip 20 until it abuts. One end portion of the inner wire 25 _I protruding from the end portion of the outer wire 25 _O is connected to the lower part of the second fitting protrusion 30, the overhanging flange portion 28, the neck portion 27 _1, and the box-shaped portion 26 in the support member 21 ₁ . A drum-shaped locking piece 37 that penetrates into the box-like portion 26 and is fixed to the end of the inner wire 25 _I is engaged and connected to the rear end of the connecting arm 34. On the other hand, the other end of the inner wire 25 _I is intended to be connected to the throttle valve of the carburetor of the power unit 12 (not shown), by turning operation of the throttle lever 22 on the grip 20 side, the throttle The valve will be opened. Moreover, the throttle valve is spring-biased in the valve closing direction, and the spring biasing force acts on the throttle lever 22 via the inner wire 25 _I , and the throttle lever 22 rotates in a direction away from the grip 20. It is energized.
[0015]
An opening 35 is provided on the rear surface (right side in FIG. 3) of the box-shaped part 26 in order to facilitate the engagement and connection operation of the locking piece 37 to the connecting arm 34 in the box-shaped part 26. The opening 35 is closed by a lid 36 that is detachable by fastening or the like and is attached to the box-shaped portion 26. Further, in order to draw the end portion of the inner wire 25 _I into the box-shaped portion 26, the neck portion 27 ₁ , the overhanging flange portion 28, and the second fitting projection portion 30 are provided with a groove 38 _{1 that} is open on the rear surface thereof. A slit 39 connecting the groove 38 ₁ and the opening 35 is provided at the lower part of the box-shaped part 26.
[0016]
Referring also to FIG. 4, the support member 21 ₁ is adjustable lever position adjusting means 40 ₁ the rotational position of the throttle lever 22 is provided, the lever position adjusting means 40 _1, the throttle lever The adjustment member 41 ₁ that contacts the contact 22 and determines the rotational position of the throttle lever 22 can be operated in a plane substantially orthogonal to the longitudinal direction of the grip 20, so that the neck 27 ₁ of the support member 21 ₁ It is made up of wearing.
[0017]
The adjustment member 41 ₁ is formed, for example, with a synthetic resin in a substantially U-shaped cross section with the rear side open, and is supported while the upper and lower ends are in sliding contact with the box-shaped portion 26 and the overhanging flange portion 28. the neck portion 27 ₁ of the member 21 _1, the proximity to the throttle lever 22 in a plane substantially perpendicular to the longitudinal direction of the grip 20, is mounted as allow away. Moreover, the adjustment member 41 ₁ is attached to the neck portion 27 ₁ so as to be operable within a range in which the rotation position of the throttle lever 22 can be adjusted from the low rotation range to the high rotation range of the brush cutter.
[0018]
Further, at least _one of both inner side surfaces of the adjustment member 41 ₁ and both outer side surfaces of the neck portion 27 _{1 which} are opposed to each other is provided with uneven portions 42 such as serrations, and adjustment is performed by frictional force generated by the uneven portions 42. The member 41 ₁ can be displaced in a direction in which the throttle lever 22 is brought into contact with the grip lever 20 to adjust the rotational position thereof, but acts from the throttle lever 22 when the operator performs an operation in the direction of approaching the grip 20. The force makes the displacement impossible, and it is supported by the neck portion 27 ₁ . In order to facilitate understanding, the uneven portion 42 is exaggerated in FIG. 4, but the unevenness that is large enough to obtain the above-described frictional force is at least on the adjusting member 41 ₁ and the neck portion 27 ₁ . It only has to be formed on one side.
[0019]
Next, to explain the action of this real施例, the neck portion 27 ₁ of the support member 21 _1, the lever position adjusting means having an adjusting member 41 ₁ in contact with the throttle lever 22 determining the rotational position of the throttle lever 22 40 ₁ is provided, and the amount of rotation of the throttle lever 22, that is, the throttle opening, is determined by rotating the throttle lever 22 with the right hand that grips the grip 20 until the throttle lever 22 is brought into contact with the adjustment member 41 ₁ . For example, the engine speed of 3000 rpm can be obtained with the hand released from the throttle lever 22, and the throttle lever 22 can be maximized until it comes into contact with the adjustment member 41 ₁ in the state where the protrusion amount from the neck portion 27 ₁ is minimum. When the engine speed of 10000 rpm or more is obtained when the rotation is limited, the adjustment amount of the adjustment member 41 ₁ from the neck portion 27 ₁ is adjusted, so that a delicate adjustment operation with the fingertip while holding the grip 20 is performed. For example, it is possible to maintain a desired throttle opening within a range of engine rotation speeds of 4500 to 8000 rpm that is always used, and it is possible to improve the efficiency of the brush cutting work by the brush cutter, thereby reducing the fatigue of the operator. It can also contribute to mitigation.
[0020]
Also the amount of rotation of the throttle lever 22 never amount of rotation of the throttle lever 22 is changed adjustment member 41 ₁ is moved in a force acting from the throttle lever 22 when the operator performs an operation in a direction to be close to the handle 20 Since it can be held in a semi-fixed state, it is not necessary to change the operating force of the throttle lever 22 even when the throttle opening is different, and if the throttle lever 22 is operated with a normal operating force until it hits the adjusting member 41 _1. Good.
[0021]
Moreover, the adjustment member 41 ₁ is mounted on the neck portion 27 ₁ of the support member 21 ₁ so as to be operable in a plane substantially orthogonal to the longitudinal direction of the grip 20 and uses a brush cutter. Sometimes, the operating position of the adjusting member 41 ₁ , that is, the rotational position of the throttle lever 22 is easily changed by applying a force larger than the normal operating force to the throttle lever 22 or operating the adjusting member 41 ₁ with a finger. It is easy to change the throttle opening when the brush cutter is used.
[0022]
Further adjustment member 41 ₁ is to place the part between the support member 21 ₁ and the throttle lever 22, the support members 21 ₁ and adjusted by effectively utilizing the dead space created between the throttle lever 22 members 41 ₁ by placing the can place the lever position adjusting means 40 ₁ compact.
[0023]
5 and 6 show a reference example. FIG. 5 is an enlarged longitudinal sectional view showing an end portion of the right handle portion, and FIG. 6 is a sectional view taken along line 6-6 in FIG.
[0024]
A grip 20 and a support member 21 ₂ made of synthetic resin are provided at the end of the right handle portion 16c of the handle 16, and the throttle lever 22 can be rotated in a direction approaching / separating from the grip 20. Is supported by the support member 21 ₂ .
[0025]
The support member 21 ₂ includes a hollow rectangular box portion 26, a neck portion 27 ₂ having a circular cross section that is continuous with the lower portion of the box portion 26, and an overhanging flange that protrudes outward from the lower end of the neck portion 27 _1. A neck portion 27 _{2 that} can be fitted into the wire insertion hole 24 of the grip 20 and the first fitting projection 29 that protrudes downward from the overhanging flange portion 28 so as to be fitted to the end portion of the right handle portion 16 c. It is intended and a second fitting projection 30 projecting downward from Zhang Detsuba portion 28 at the rear side of, and is fixed to an end portion of the right handle section 16c in the same manner as the actual施例above.
[0026]
End of the outer wire 25 _O inner wire 25 _I projecting from the end portion of the throttle wire 25, the second fitting projection 30 of the supporting member _212, the lower portion of ChoIzurutsuba 28 and Hakojo unit 26 through Then, a drum-shaped locking piece 37 which is inserted into the box-shaped portion 26 and fixed to the end portion of the inner wire 25 _I is engaged and connected to the rear end portion of the connecting arm 34. And Thus, in order to pull the end of the inner wire 25 _I in the box-shaped portion 26, the ChoIzurutsuba portion 28 and the second fitting projections 30, grooves 38 ₂ which is open on the rear surface thereof is provided.
[0027]
The support member 21 ₂ is provided with a lever position adjusting means 40 ₂ capable of adjusting the rotational position of the throttle lever 22, and the lever position adjusting means 40 ₂ is in contact with the throttle lever 22 and the throttle lever 22. The adjustment member 41 ₂ that determines the rotation position is attached to the neck portion 27 ₂ of the support member 21 ₂ so that the adjustment member 41 ₂ can be operated in a plane substantially orthogonal to the longitudinal direction of the grip 20.
[0028]
The adjustment member 41 ₂ is in contact with the neck portion 27 ₂ of the support member 21 ₂ in a plane substantially orthogonal to the longitudinal direction of the grip 20 while sliding the upper and lower ends to the box-shaped portion 26 and the overhanging flange portion 28. is intended to be mounted as pivotable around a neck 27 ₂ is formed in a substantially annular synthetic resin has a one place along the slit 43 for allowing attachment to the neck 27 ₂ in the circumferential direction The
[0029]
On the side facing to the throttle lever 22 of the adjustment member 41 ₂ is provided with a cam surface 44 that the distance is made different in the circumferential direction from the neck 27 ₂ of the axis, and adjustment at the rear side of the neck portion 27 ₂ member 41 the _2, together with the long hole 45 which allowed to inserting the inner wire 25 _I is formed in an arc shape about the axis of the neck portion 27 _2, a slit 46 for inserting the inner wire 25 _I into the long hole 45 It is provided continuously with the long hole 45.
[0030]
Further, an uneven portion 47 such as serration is provided on at least one of the inner peripheral surface of the adjustment member 41 ₂ and the outer peripheral surface of the neck portion 27 ₂ facing each other, and the adjustment member is caused by the frictional force generated by the uneven portion 47. 41 ₂ can be rotated in the direction to change the contact position of the throttle lever 22 with the cam surface 44 with respect to the neck portion 27 _2, but when the operator performs an operation in the direction to bring the grip 20 close. The force acting from the throttle lever 22 makes the displacement impossible and is supported on the neck portion 27 ₂ . In order to facilitate understanding, the uneven portion 47 is exaggerated in FIG. 6, but the unevenness that is large enough to obtain the above-described frictional force is at least on the adjusting member 41 ₂ and the neck portion 27 ₂ . It only has to be formed on one side.
[0031]
This reference example as well, and allowed to rotate the adjustment member 41 ₂ around the neck portion 27 ₂ of the support member 21 _2, similarly to the actual施例by changing the contact position of the cam surface 44 of the throttle lever 22 The effect of can be produced.
[0032]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0033]
For example, according to the present invention, not only a brush cutter but also a handle is provided with a grip and a support member, and the throttle lever is supported by the support member so as to be able to rotate in a direction approaching and separating from the grip. It can be widely implemented in connection with the throttle operating device of the machine .
[0034]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the throttle with a compact configuration in which at least a part of the adjustment member is disposed in the dead space generated between the support member and the throttle lever so as to effectively use the dead space. only a simple operation of Komu grip the lever grip side, Ru can be easily perform fine adjustment of the throttle opening at least the working rotation range without performing fine adjustment operation with the finger. Moreover , when the operator applies a normal operating force to the throttle lever, the operating position of the adjusting member does not change, and when an operating force greater than the normal operating force is applied, the operating position of the adjusting member easily changes. As a result, it is possible to easily change the throttle opening during the use of the power work machine by facilitating the displacement operation of the adjusting member during the use of the power work machine.
[Brief description of the drawings]
FIG. 1 is a perspective view of a brush cutter in a use state according to an embodiment of the present invention .
FIG. 2 is a side view of a brush cutter.
FIG. 3 is an enlarged longitudinal sectional view showing an end portion of a right handle portion.
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is an enlarged longitudinal sectional view showing an end portion of a right handle portion in a reference example.
6 is a cross-sectional view taken along line 6-6 of FIG.
[Explanation of symbols]
16 ... handle 20 ... grip 21 ₁ ... support member 22 ... throttle lever
26 ... Box-shaped part
27 ₁ ・ ・ Neck
28 ... Overhang barb 41 ₁ .. Adjustment member
42 ... Uneven portion

Claims (1)

The handle (16) is provided with a grip (20) and a support member (21 ₁ ), and the throttle lever (22) can be pivoted in a direction approaching or moving away from the grip (20). ₁ ) In the throttle operating device of a power work machine supported by
The support member (21 ₁ ) includes a box-shaped part (26) that rotatably supports the throttle lever (22), a neck part (27 ₁ ) connected to the box-shaped part (26), and a neck part (27 ₁ ). And an overhang flange (28) adjacent to the end of the grip (20). The neck (27 ₁ ) abuts against the throttle lever (22) and An adjustment member (41 ₁ ) for determining the rotation position of the throttle lever (22) to be adjustable is fitted so as to be operable in a plane substantially perpendicular to the longitudinal direction of the grip (20) .
The adjustment member (41 ₁ ) is in sliding contact with the box-shaped part (26) and the overhanging flange part (28) of the support member (21 ₁ ) at both ends, and is located on both sides of the adjustment member (41 ₁ ). On at least one of the outer side surfaces of the side surface and the neck portion (27 ₁ ), an uneven portion (42) that generates a frictional force between the outer side surfaces is provided,
The frictional force is such that when the operator applies a normal operating force to the throttle lever (22), the operating position of the adjustment member (41 ₁ ) does not change, and a larger operating force than the normal operating force is applied. A throttle operating device for a power working machine, characterized in that the operating position of the adjusting member (41 ₁ ) sometimes changes easily .

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