JP4094786B2 - Hand lever device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hand lever device for operating a driven member such as a throttle valve of an internal combustion engine via a cable, and in particular, disposed near a grip portion of a handle in a working machine such as a hedge trimmer or a brush cutter. The present invention relates to a device suitable for opening and closing the throttle valve via a throttle cable.
[0002]
[Prior art]
For example, in a working machine such as a hedge trimmer or a brush cutter driven by a working unit such as a cutting blade by an internal combustion engine, the U-shaped provided in the working machine such as a trimming machine or a brush cutter is provided to adjust the output of the internal combustion engine A hand lever device for adjusting the opening degree of the throttle valve of the internal combustion engine is disposed in the vicinity of a grip portion such as a handle or a bar handle.
[0003]
This hand lever device is usually provided with a throttle trigger (throttle lever) that is operated by a finger of an operator. By swinging the throttle lever, the opening degree of the throttle valve is controlled via a throttle cable. It is designed to adjust. The throttle valve is normally urged in the direction of the minimum opening (idle rotation opening) at all times, and is held at the idle rotation opening when the throttle lever is not operated, and the throttle cable is longer than a predetermined length. When pulled, there is no play, so that the idle rotation opening degree starts to open to the high speed rotation side.
[0004]
As such a hand lever device for adjusting the opening of the throttle valve, when the throttle lever is released from the rotating operation state, the lever is automatically moved together with the throttle valve to the original position (idle rotation opening). There are two types: an automatic idle rotation opening return type that is set to return to a fixed type, and a fixed type that allows the throttle lever to be held in a stationary state at a desired rotational operation position even after the finger is released. It is known (see Japanese Utility Model Publication No. 57-19944).
[0005]
The automatic return type is a working machine in which the engine automatically returns to an idling state when the finger is released from the throttle lever, and the engine rotational driving force is transmitted to a working unit such as a cutting blade through a centrifugal clutch. If this is the case, the centrifugal clutch is disengaged and power transmission to the working unit is interrupted. Therefore, in the event of an unexpected situation, the throttle valve is immediately returned to the idle rotation position and the working unit is stopped. Although it is possible to improve the safety, the throttle lever must be held with the fingers at all times to maintain the desired rotation operation position, so the intermediate opening is difficult to use and the fingers become tired. The problem is that the operation amount (rotation speed) is not constant.
[0006]
In general, in consideration of usability, a rotation lever such as a throttle lever that is operated by a finger can take only two positions of a release position and a set position (grip position) without taking an intermediate opening. It is desirable to make the throttle valve the same rotation operation position (set position) when the throttle valve is set to an intermediate opening (partial opening) or fully open (WOT). It is done.
[0007]
On the other hand, the fixed type can solve the problem of the automatic idle rotation opening return type, and the throttle lever can always be kept in a stationary state even if it is released to the desired rotation operation position. Although there are advantages such as freeing fingers and making work easier, if an unexpected situation occurs, another operation to release the position holding function of the throttle lever is required, and the work section is immediately stopped. Therefore, there is a problem that the safety is inferior to that of the automatic idle rotation opening return type.
[0008]
In any of the above-described types, after the throttle lever is once released and the operation is interrupted, the throttle valve is returned to the previous opening in order to resume the operation (this is often the case with a working machine such as a brush cutter). ) Had to be readjusted, and there was still room for improvement in terms of operability such as troublesome operation.
[0009]
In order to eliminate or achieve the conventional problems and problems related to the hand lever device as described above, the applicant of the present invention has previously been rotated, for example, as described in JP-A-8-303262. A main lever and a sub lever, and a cable connected to the driven member is pulled by the sub lever via a folding member such as a movable pulley, and the folding member is moved by the main lever. We have proposed a hand lever device.
[0010]
According to such a hand lever device, the opening degree of a throttle valve or the like as a driven member can be adjusted via a cable and can be easily maintained at a desired opening degree. Degree), ensuring high safety, making it difficult for the fingers to get tired, and even if you want to reset the throttle valve to the opening before returning to the idle rotation position, readjustment is unnecessary The advantages of being able to do so are obtained.
[0011]
However, in the proposed hand lever device, when the main lever is in the release position where the main lever is not rotated (during idling), the throttle cable is loosened (played), so the sub lever is rotated. When operated, there is a problem that the throttle cable moves slightly, and accordingly, the opening degree of the throttle valve, which is a driven member, changes and the idle rotation speed fluctuates. Such fluctuations in the idling speed are not a problem in actual work, but there is a risk that the reliability and commercial value of the hand lever device may be lowered, and it is desired to be improved.
[0012]
Further, in the proposed hand lever device, in addition to the above problems, the cable is slack, so that the cable is easily detached from the connecting portion and the folding member, a plurality of cables are required, and the assembling property is poor. There was also a problem.
Therefore, the applicant of the present invention previously proposed a hand lever device having the following configuration in order to solve the above-mentioned problems (see Japanese Patent Application No. 11-153802).
[0013]
The hand lever device includes a main lever that is pivoted, a sub lever that is pivotally operated with the first pivot axis as a fulcrum, and is held stationary at an arbitrary pivoting position, and the sub lever A tension lever that is pivoted about a second pivot axis disposed on an integral pivot section that is pivoted together, and a cable for controlling the driven member is connected to the tension lever. The cable is pulled by rotating the tension lever around the second rotation axis by the main lever, and the main lever is in a release position where the main lever is not operated to rotate. In some cases, the position of the coupling point between the tension lever and the cable is made constant regardless of the position of the rotation operation of the sub lever. The position of the coupling point is set to said first rotary shaft line is a rotation fulcrum of the sub-lever.
[0014]
In the hand lever device having such a configuration, the cable length or the like is previously set so that the cable controlling the driven member (throttle valve) does not loosen (play) even when the main lever is in the release position (idling). When the main lever is turned to the set position, the cable is pulled, and accordingly, the throttle valve is turned from the minimum opening (idle opening) to the opening direction, The opening is adjusted according to the rotation operation position of the sub lever.
[0015]
Here, the position of the coupling point between the tension lever and the cable when the main lever is in the release position (during idling) is set on the first rotation axis that is the rotation fulcrum of the sub lever, The position of the connecting point between the tension lever and the cable is kept constant regardless of the position of the sub lever to be rotated between the high speed side and the low speed side, so that the sub lever can be operated to rotate during idling. Even so, the cable does not move, and therefore the throttle valve also maintains the idling rotation opening, so that the idling speed does not fluctuate and becomes stable, and the cable does not sag. Therefore, it becomes difficult for the cable to come off from the connecting portion and the like, and as a result, the reliability is increased and the commercial value is improved.
[0016]
[Problems to be solved by the invention]
By the way, it is desirable in terms of device cost and productivity that the hand lever device as described above has versatility that can be commonly used for various devices, but in the proposed hand lever device, for example, If the specifications (dimensions, etc.) of the carburetor throttle valve mounted on the portable power work machine are different, the carburetor throttle valve can be opened from the minimum opening (idle opening) to the maximum opening (WOT). The required pull amount of the throttle cable (required full open pull amount) differs.
[0017]
However, in order to make the hand lever device versatile, the maximum opening degree (maximum rotation position) of the sub lever is set so as to correspond to the carburetor throttle valve having the largest required full opening tension. Therefore, if the same hand lever device is used to control the opening degree of the carburetor throttle valve, the required full opening tension is relatively small, the following problem arises.
[0018]
That is, in the state where the main lever is in the release position, the sub lever can be rotated to the maximum rotation position on the high speed side even when the required full-open tension amount is relatively small. However, in the proposed hand lever device, the cable length and the like are set in advance so that the throttle cable does not loosen (play) even when the main lever is in the release position. When the main lever is gripped and rotated to the set position while being rotated to the maximum rotation position, the sub lever and the tension lever are connected to the carburetor throttle valve having the maximum required full-open tension and the The required full open tension amount returns to the low speed side by the opening corresponding to the difference in the required full open tension amount with the carburetor throttle valve having a relatively small required full open tension amount. The movement of the sub-lever returning is not a problem in actual work, but is an unexpected and undesired movement, giving the user anxiety and lowering the reliability and commercial value of the hand lever device. There is a fear and it is desirable to improve.
[0019]
Further, when the sub lever is rotated from the low speed side to the high speed side with the main lever held in the set position, the sub lever can be further rotated even after the carburetor throttle valve is fully opened. Therefore, the carburetor throttle valve and the parts around the cable are overloaded and may be damaged, and the carburetor throttle valve and the parts around the cable may have excessive rigidity and strength. There is also a problem in that the cost of the apparatus is increased as required.
[0020]
The problem as described above can be solved by changing the components such as the main lever, the sub lever, the tension lever, and the case member according to the required fully opened tension amount of each carburetor throttle valve. Since it is necessary to prepare many types of components with different dimensions and shapes, it is necessary to prepare many types of molds, resulting in higher equipment costs and lower productivity. Also.
[0021]
The present invention has been made in view of such problems, and an object of the present invention is to control the opening degree of a throttle valve or the like as a driven member via a cable and easily achieve a desired opening degree. It can be held and instantly returned to the minimum opening (idle rotation opening), ensuring high safety, making it difficult for the fingers to get tired, and before returning the throttle valve to the idle rotation opening Readjustment can be made unnecessary when the opening is set to be, and even if the required maximum (full open) tensile amount of the cable is different, the change of the component parts can be suppressed to an unnecessary or minimum, The sub-lever can be prevented from causing unexpected movement, so that the versatility can be increased and the device cost can be kept low, and the productivity and reliability can be reduced. Is to provide a hand lever device which is to obtain aim also improvement of commercial value.
[0022]
[Means for Solving the Problems]
  In order to achieve the above-described object, the hand lever device according to the present invention is basically operated to rotate with the main lever to be rotated and the first rotation axis as a fulcrum, and to any rotation. A sub-lever held stationary at the operating position; a tension lever that is pivoted about a second pivot axis disposed on an integral pivot that is pivoted together with the sub-lever; and the tension lever A push lever that pushes the lever,Internal combustion engine throttle valveIs connected to the tension lever, and the position of the second rotation axis is moved by the turning operation of the sub lever, and the turning operation of the main lever is performed.RotateThe push leverWith push pinA hand lever device configured to pull the cable by rotating the tension lever around the second rotation axis, wherein the hand lever device is separate from the sub lever, the tension lever, and the case member. A position limiting member for limiting the maximum rotation position of the sub lever is provided, and the position limiting memberIs mounted and held on the case member or the sub-lever so as to change the posture in order to change the maximum rotation position of the sub-lever.Of the sub-leverBy restricting the maximum rotation position, the movement of the position of the second rotation axis of the tension lever is limited, so that the pushing movement between the pushing pin and the tension lever of the pushing lever is limited. A play gap is formedThe maximum pulling amount of the cable due to the turning operation of the main lever is limited.
[0023]
  AndIn a more specific preferred mode, a stop pin protrudes from the sub-lever, and an arc-shaped elongated hole into which the stop pin is movably inserted is formed on the outer surface of the case member. The position limiting member is mounted and held at the end of the elongated lever in the rotation direction of the sub lever.
[0024]
In a more specific preferred embodiment, the position limiting member is formed of a stopper piece having a cross or convex cross section having a plurality of stopper surfaces with different protruding lengths from the fixed center point.
In another preferred embodiment, when the main lever is in a release position where the main lever is not operated to rotate, the position of the coupling point between the tension lever and the cable is constant regardless of the position of the sub lever. It is made to become.
[0025]
  In a more preferred aspect, the position of the coupling point when the main lever is in the release position is set on the first rotation axis..
[0026]
In the hand lever device according to the present invention, the position limiting member is a driven member, for example, a carburetor throttle valve mounted on a portable power work machine is opened from a minimum opening (idle opening) to a maximum. The maximum rotation position of the sub-lever is limited according to the amount of throttle cable tension (required fully opened tensile amount) required to open up to the degree (WOT). In order to correspond the maximum rotation position of the sub-lever to each of the carburetor throttle valves, a plurality of types of position limiting members of a fixed position fixing type are prepared in advance, and when the hand lever device is assembled, the plurality of types of A suitable one of the position limiting members may be mounted and held on the case member or the like, or the sub-restriction member may be changed by changing the mounting and holding posture. A variable limit position type (for example, the cross-shaped) position limit member that can change the maximum rotation position of the lever is prepared, and when the hand lever device is assembled, it is used as the case member or the like. In addition, it may be mounted and held in a corresponding posture (orientation).
[0027]
In a preferred aspect of the hand lever device according to the present invention configured as described above, the cable for controlling the driven member (throttle valve) is slack even when the main lever is in the release position (idling). The cable length and the like are set in advance so as not to cause (play), and when the main lever is turned to the set position, the cable is pulled, and accordingly, the throttle valve is opened to the minimum opening (idle opening). ) In the opening direction, and the opening degree is adjusted according to the rotation operation position of the sub-lever.
[0028]
Here, since the position limiting member is mounted and held (position fixed) on the case member or the like as described above, the maximum rotation position of the sub lever is limited. That is, when the required full-open tension amount of the carburetor throttle valve is small, the maximum opening of the sub lever is made smaller than when it is large, and the maximum rotation position of the sub lever is limited to a position closer to the low speed side. .
[0029]
For this reason, when the main lever is in the release position, the smaller the required full-open tension amount, the rotation action point of the main lever with respect to the tension lever (pushing pin 44 in the embodiment described later) and the tension. A larger play gap is formed between the lever. By forming the play gap, when the main lever is gripped and rotated to the set position, the tension lever cannot be rotated at the beginning of gripping, and therefore the cable is not pulled. The grip lever starts to rotate after being gripped to some extent, and the cable is pulled.
[0030]
That is, as the required full-open tension amount is smaller, the play gap is increased. Therefore, the tension lever of the rotation operation opening degree from the release position to the set position in the main lever is rotated. The effective opening that can be pulled (the cable can be pulled) is reduced as the required full-open tension amount is smaller. As a result, the smaller the required full-open tension amount, the smaller the maximum tensile amount is.
[0031]
As a result, even when the required fully open tension is relatively small, the sub lever is rotated to the maximum rotation position on the high speed side, and the main lever is gripped and rotated to the set position. However, the sub-lever does not move, and therefore the unexpected and undesired movement of the sub-lever does not occur as described above.
[0032]
Further, when the sub lever is rotated from the low speed side to the high speed side with the main lever held in the set position, the maximum rotation position of the sub lever is set to the required full open (maximum) by the position limiting member. ) Since it is limited according to the amount of tension, after the carburetor throttle valve is fully opened, the cable is not pulled any further. Therefore, an excessive force is not applied to the carburetor throttle valve and the parts around the cable, and it is not necessary to give the carburetor throttle valve and the parts around the cable more rigidity and strength than necessary.
[0033]
In the hand lever device of the present invention, the position of the coupling point between the tension lever and the cable when the main lever is in the release position (during idling) is the first rotation that is the rotation fulcrum of the sub lever. Since the position of the connecting point between the tension lever and the cable is set to be constant regardless of where the rotation operation position of the sub lever is on the high speed side or the low speed side, Even if the sub-lever is turned, the cable does not move. Therefore, the throttle valve also keeps the idling rotation opening, so that the idling speed does not fluctuate and becomes stable. Since no slack is generated in the cable, it is difficult for the cable to come off from the connecting portion or the like. As a result, the reliability increases and the commercial value is improved.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a brush cutter in which the first embodiment of the hand lever device according to the present invention is adopted. The brush cutter 1 in the illustrated example includes a working unit 3 including a cutting blade 13 and a safety cover 14 on the distal end side of a cylindrical bar handle (operating rod) 7 in which grip portions 11 and 12 are arranged in parallel at a predetermined interval. And a recoil starter 6 or a fuel as a power source for driving the cutting blade 13 via a drive shaft 8 (see FIGS. 2 to 4) inserted in the bar handle 7 on the rear end side. An internal combustion engine (small air-cooled two-cycle gasoline engine) 2 provided with a tank 4 is provided, and the internal combustion engine 2 is provided with a carburetor having a throttle valve CV and a spark plug 5.
[0035]
In the present embodiment, the throttle valve CV is always urged in the minimum (idle rotation) opening direction as a general method in a carburetor, and a throttle (inner) cable 16 (described later) connected thereto. In FIGS. 2 to 4)), there is no slack (play) as in the conventional case described above, and when the actuator is pulled from a non-operating state, it immediately starts to open from the minimum opening.
The hand lever device 10 of the present embodiment is attached to the grip portion 11, 12 in the vicinity of the rear grip portion 11 that is normally gripped with the right hand in order to adjust the opening degree of the throttle valve CV. Yes.
[0036]
The hand lever device 10 has a case member 20 that is fitted and fixed in the vicinity of the rear grip portion 11 of the bar handle 7, and the outer member of the Bowden cable 15 connected to the throttle valve CV is connected to the case member 20. A main lever 30, a sub lever 50, a tension lever 40, a lock lever 80, and the like, which will be described later, are rotatably provided for pulling the throttle cable 16 inserted through the tube 17 (see FIGS. 2 to 4). .
The case member 20 is made of synthetic resin and has a two-part structure including a left cover case 21 positioned on the left side when viewed from the rear and a right cover case 22 positioned on the right side when viewed from the rear.
[0037]
The left cover case 21 and the right cover case 22 have a substantially square dish-like appearance each having a different depth, and are inserted and screwed into two upper and lower positions so as to sandwich the bar handle 7. The main lever 30, the sub lever 50, and the tension lever are externally fitted and fixed by screwed screws 23, 24 and screws 25 for tightening the tightening bands 66 provided on the front side thereof. Reference numeral 40 is arranged to be biased toward the right cover case 22 of the two cases 21 and 22, and the lock lever 80 is disposed on the left cover case 21 side.
[0038]
The main lever 30 that is rotatably held by the case member 20 is made of synthetic resin and is close to the lower surface of the rear grip portion 11 as can be understood by referring to FIGS. A U-shaped operation portion 32 that is rotated by a finger, and a boss portion 31 that is loosely fitted on a first pin-shaped support shaft 33A that protrudes from the right cover case 22, A gear portion 36 is formed at an oblique upper portion on one end side (the right cover case 22 side) of the boss portion 31. On the other end side of the boss portion 31 (on the left cover case 21 side), a second pin-shaped support shaft 33B that is pivotally supported on the left cover case 21 side protrudes. The main lever 30 is externally provided with a torsion coil spring 35 that constantly urges the main lever 30 in a direction away from the rear grip portion 11 (in the release position F direction). One end portion 35 a of the torsion coil spring 35 is locked in the case member 20, and the other end portion 35 b is locked in the notch portion 32 a of the boss portion 31.
[0039]
The gear portion 36 formed on the main lever 30 has a lower boss of a generally C-shaped push lever 37 loosely fitted on a third pin-shaped support shaft 39A protruding from the right cover case 22. A gear portion 38 provided on the portion 37A is meshed, and the main lever 30 (the operation portion 32 thereof) is moved from the release position F as indicated by the phantom line in FIG. 6 to the rear grip as indicated by the solid line. When the rotation operation (rotation angle α) is performed to the set position S close to the portion 11, the push lever 37 rotates clockwise around the third pin-shaped support shaft 39A. Further, an L-shaped locking engagement portion 47 is provided at the distal end portion of the push lever 37 so as to be engaged with the engagement portion 84 of the lock lever 80.
[0040]
Further, at the intermediate portion of the push lever 37, when the main lever 30 is turned from the release position F to the set position S, a turning action point for turning a tension lever 40 which will be described later. A push pin 44 is projected.
As shown in FIGS. 3 and 5, the right side surface of the right cover case 22 is provided with a rice ball-shaped overhanging portion 22A and a thick protruding portion 22a. The sub lever 50 is disposed outside the thick protrusion 22a. A fitting hole 51A having a non-circular cross section (both sides parallel chamfered) is formed in the base end side boss portion 51 of the sub lever 50, and a bearing formed in the right cover case 22 in the fitting hole 51A. A fitting convex portion 62 formed on the shaft portion 61 of the integral rotating portion 60 that is pivotally supported in the hole 26 is fitted, and is connected so as to be integrally rotatable by a screw 53. The sub lever 50 is The first pivot axis Oa (the central axis of the screw 53) is pivoted back and forth.
[0041]
In addition, a wave washer 55 is interposed between the sub lever 50 and the right cover case 22 to hold the sub lever 50 in an unmoved state at an arbitrary rotation operation position. The wave washer 55 is pressed against the sub lever 50 and the right cover case 22 by the tightening force of the screw 53, and the sub lever 50 is held at an arbitrary rotational operation position by a frictional resistance therebetween. It has become.
[0042]
And in this embodiment, while the stop pin 57 protrudes in the said sub lever 50, the said stop pin 57 is inserted in the said thick protrusion part 22a of the said right side cover case 22 so that a movement is possible, An arc-shaped elongated hole 27 centered on the first rotation axis Oa is formed, and a mounting hole 29 is continuously provided in a terminal end (front end) portion 27b of the elongated hole 27 viewed in the rotation direction of the sub lever 50. Further, a positioning hole 28 is formed in the mounting hole 29, and the throttle cable 16 is provided in the mounting hole 29 and the positioning hole 28 in accordance with a required full-open tension amount of the carburetor throttle valve CV. In order to limit the maximum pulling amount, a stopper piece 90 as a position limiting member for limiting the maximum rotation position of the sub lever 50 and a positioning pin 95 projecting from the stopper piece 90 are, for example, light pressure. It is mounted held by.
[0043]
The mounting hole 29 includes four grooves 29a, 29b, 29c and 29d arranged in a cruciform shape including the end portion 27b of the long hole 27. From the fixed center point J (the center line of the positioning pin 95) so that the maximum rotation position of the sub lever 50 can be changed into four by changing the mounting and holding posture (turning 90 degrees to change the direction). The right cover case 22 and the sub-lever 50 are separate parts having a convex cross section having four stopper surfaces 91, 92, 93, 94 having different projecting lengths.
[0044]
In the embodiment shown in FIGS. 2 to 7, the stopper piece 90 has the longest protrusion length from the fixed center point J of the stopper surfaces 91 to 94 as shown in FIG. The short stopper surface 91 is mounted and held (first mounting and holding mode) in a state where the short stopper surface 91 is in contact with the terminal end portion 27b of the long hole 27, and the sub lever 50 has the stop pin 57 at the maximum. Opening from the minimum rotation position L (A) contacting the start end (rear end) portion 27a of the long hole 27 to the maximum rotation position H (A) stopped contacting the shortest stopper surface 91 It can be rotated by an angle θa.
[0045]
Further, as shown in FIG. 9, of the stopper surfaces 91 to 94, the stopper surface 92 having the second shortest protruding length from the fixed center point J is opposed to the terminal portion 27 b in the elongated hole 27. In the state of being attached and held in the mounting hole 29 in the contacted state (second mounting and holding mode), the sub lever 50 has the stop pin 57 contacting the start end portion 27a of the elongated hole 27 at the maximum. It is rotated by the opening degree θb (<θa) from the minimum rotation position L (A) to the maximum rotation position H (B) that comes into contact with the second shortest stopper surface 92 and stops.
[0046]
Furthermore, as shown in FIG. 10, the stopper surface 93 having the second longest protruding length from the fixed center point J of the stopper surfaces 91 to 94 is opposed to the terminal portion 27 b in the elongated hole 27. In the state of being attached to and held in the mounting hole 29 in a contacted state (third mounting and holding mode), the sub-lever 50 has the stop pin 57 contacting the start end portion 27 a of the elongated hole 27 at the maximum. It is rotated by the opening degree θc (<θb) from the minimum rotation position L (A) to the maximum rotation position H (C) that comes into contact with the second long stopper surface 93 and stops.
[0047]
Finally, as shown in FIG. 11, of the stopper surfaces 91 to 94, the stopper surface 94 having the longest protrusion length from the fixed center point J is brought into contact with the end portion 27 b in the elongated hole 27. When the mounting lever 29 is mounted and held in the mounted state (fourth mounting and holding mode), the sub-lever 50 is at a maximum and the stop pin 57 is in contact with the start end portion 27a of the elongated hole 27 at the maximum. It is rotated by the opening degree θd (<θc) from the rotation position L (A) to the maximum rotation position H (D) that comes into contact with the longest stopper surface 94 and stops.
[0048]
  On the other hand, the pulling lever 40 having an L-shaped cross section (see FIG. 3) is rotatably held by the integral rotating portion 60 via a screw 45 and a sleeve 46. The screw 45 and the sleeve 46 are inserted in a substantially central portion of the vertical side portion 42 of the tension lever 40, and the tension lever 40 is a second rotation that is a center line of the screw 45 and the sleeve 46. It can be turned around the axis Ob.The position of the second rotation axis Ob moves according to the position of the sub lever 50.It looks like(See Figs. 4 and 6).
[0049]
An end fitting 16 a attached to the tip of the throttle cable 16 is mounted and locked to the bottom 41 of the tension lever 40. The tip of the outer tube 17 of the Bowden cable 15 through which the throttle cable 16 is inserted is locked by a locking portion 18 (FIGS. 2 and 4) provided in the rear grip portion 11, and the throttle The cable 16 extends straight from the locking portion 18 and is connected to the bottom side portion 41 of the tension lever 40. Here, during idling when the main lever 30 is at the release position F, the cable K is arranged such that the position of the coupling point K between the tension lever 40 and the cable 16 is on the first rotation axis Oa. 16 lengths etc. are set.
[0050]
  The lock lever 80 disposed on the left cover case 21 side is rotated in a clockwise direction by a palm that grips the rear grip portion 11 so as to be close to the upper surface of the rear grip portion 11. A linear operation portion 81 extending obliquely rearward and a fourth pin-shaped support shaft protruding from the left cover case 2183BAnd a locking portion 84 that is locked by a locking locking portion 47 provided at the distal end of the push lever 37. The locking portion 84 has one end 85a.SaidIt is urged counterclockwise by a torsion coil spring 85 locked to the case member 20.
[0051]
Therefore, when both the main lever 30 and the lock lever 80 are in the release position F as shown in FIG. 4, the pushing lever is configured such that the locking portion 84 is rotated in conjunction with the main lever 30. 37 abuts on the locking engaging portion 47 of the lock, and prevents such unexpected rotation.
Further, a slide-type stop switch 67 for stopping discharge of the ignition plug 5 of the internal combustion engine 2 and stopping the engine 2 is provided between the upper surface portions of the left cover case 21 and the right cover case 22. Is provided.
[0052]
In the hand lever device 10 of the present embodiment configured as described above, even when the main lever 30 is in the release position F as shown in FIGS. 4 and 7 (during idling), the throttle valve CV. The cable length or the like is set in advance so that the throttle cable 16 that controls the slack (play) does not occur, and the position of the coupling point K between the tension lever 40 and the cable 16 is the rotation fulcrum of the sub lever 50. Is set on the first rotation axis Oa, so that the position of the rotation of the sub-lever 50 is anywhere on the low speed L side (FIG. 4) to the high speed H side (FIG. 7). The cable 16 does not move even when the sub lever 50 is rotated during idling when the position of the coupling point K is constant (non-moving) and the main lever 30 is in the release position F. Accordingly, the throttle valve CV also maintains the idling rotation opening, so that the idling rotation speed does not fluctuate and becomes stable, and the cable 16 does not sag, so that the cable 16 is connected. As a result, the reliability increases and the product value also increases.
[0053]
On the other hand, as shown in FIG. 6, when the sub lever 50 is at the high speed position H, if the lock lever 80 and the main lever 30 are rotated to the set position S close to the rear grip portion 11, the push lever The upper half side of the tension lever 40 is pushed clockwise by the push pin 44 of the moving lever 37, whereby the position of the coupling point K between the lower half tension lever 40 and the cable 16 is Moving from the first rotation axis Oa forward (leftward as viewed in FIG. 6), the cable 16 is pulled, and the throttle valve CV rotates from the minimum opening (idle rotation opening) to the opening direction. The opening degree is adjusted according to the rotational operation position of the sub-lever 50 by being moved.
[0054]
Further, when the opening degree of the throttle valve CV is adjusted, for example, when an unexpected situation occurs, the main lever 30 is released when it is desired to greatly reduce the engine speed immediately. As a result, the throttle cable 16 is always urged in the closing direction of the throttle valve CV, so that the tension lever 40 is rotated in the opposite direction (counterclockwise) to the tension lever 40. The connection point K with the cable 16 is returned to the position on the first rotation axis Oa, the cable 16 is in the non-operation state, the throttle valve CV is returned to the idle rotation opening, and the engine 2 is It automatically enters the idling state.
[0055]
Here, if the working machine 1 is configured to transmit the engine rotational driving force to the working unit 3 composed of a cutting blade or the like via a centrifugal clutch (not shown) having a configuration known per se, the centrifugal clutch is in a disconnected state. Thus, the power transmission to the working unit 3 is interrupted, so that the operation of the cutting blade or the like is immediately stopped.
[0056]
As described above, once the main lever 30 is released, when the main lever 30 is rotated again to the set position S close to the rear grip portion 11, the sub lever 50 remains held at the previous operation position. Therefore, the throttle valve CV is returned again to the opening before the main lever 30 is released, and readjustment of the sub lever 50 is not necessary.
[0057]
Therefore, in the hand lever device 10 of the present embodiment, the opening degree of the throttle valve CV as the driven member can be adjusted via the cable 16 and can be easily held at a desired opening degree, and immediately opened to the minimum. If you want to set the opening before returning the throttle valve CV to the idling rotation opening, it is possible to return to the degree (idle rotation opening) and to ensure high safety, to make the fingers less tired Readjustment can be eliminated.
[0058]
Further, in the hand lever device 10 of the present embodiment, the stopper piece 90 as the position limiting member as described above is mounted and held in the mounting groove 29 formed in the right cover case 22, so that the sub lever The maximum rotation position of 50 corresponds to H (A), H (B), H (C in FIGS. 8 to 11 in accordance with the mounting and holding postures (first to fourth mounting and holding modes) of the stopper piece 90. ) And H (D). That is, when the required fully open tension amount of the carburetor throttle valve CV is small, the maximum opening degree of the sub lever 50 is reduced (θa> θb> θc> θd) and the maximum rotation of the sub lever 50 is smaller than when the required full open tension amount is large. The moving position is limited to a position closer to the low speed side.
[0059]
For this reason, when the main lever 30 is in the release position F, the smaller the required full-open tension amount, the more the push pin 44 and the tension that are the turning action points of the main lever 30 relative to the tension lever 40 A larger play gap G (see FIG. 7) is formed between the lever 40 and the lever 40. Since the play gap G is formed, when the main lever 30 is gripped and rotated to the set position S, the tension lever 40 cannot be rotated at the beginning of the gripping. The throttle cable 16 is not pulled, and when the gap G becomes zero after being grasped to some extent, the tension lever 40 starts to rotate and the cable 16 is pulled.
[0060]
In other words, the play gap G is increased as the required full-open tension amount is smaller. Therefore, the tension lever 40 in the rotation operation opening degree from the release position F to the set position S in the main lever 30 is increased. Can be rotated (the cable 16 can be pulled), the effective opening is reduced as the required full-open tension is smaller. As a result, the smaller the required full-open tension is, the smaller the maximum tensile amount is. Is reduced.
[0061]
  Thereby, even when the required full-open tension amount is relatively small, the sub lever 50 is rotated to the maximum rotation position on the high speed H side (FIG.), Even if the main lever 30 is gripped and rotated to the set position S, the sub lever 50 does not move, and therefore, the unexpected and undesired movement of the sub lever as described above does not occur.
[0062]
Further, when the sub lever 50 is rotated from the low speed L side to the high speed H side while the main lever 30 is gripped to the set position S, the maximum rotation position of the sub lever 50 is set by the stopper piece 90. As described above, the restriction is made in accordance with the required fully open (maximum) pulling amount, so that the throttle cable 16 is not pulled any more after the carburetor throttle valve CV is fully opened. Therefore, an excessive force is not applied to the carburetor throttle valve CV and the parts around the cable, and it is not necessary to give the carburetor throttle valve CV and the parts around the cable unnecessarily rigid and strong.
[0063]
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 designs can be used without departing from the spirit of the invention described in the claims. It can be changed.
For example, in the illustrated embodiment, the hand lever device is used to adjust the opening degree of the throttle valve CV of the internal combustion engine 2, but the hand lever device of the present invention is used for purposes other than the opening degree adjustment of the throttle valve CV. Needless to say, it can also be used.
Further, the hand lever device can be used as it is attached not only to the bar handle 7 but also to a U-shaped handle or the like.
[0064]
【The invention's effect】
As can be understood from the above description, according to the hand lever device of the present invention, the opening degree of a throttle valve or the like as a driven member can be controlled via a cable and can be easily held at a desired opening degree, In addition, it can be instantly returned to the minimum opening (idle rotation opening), ensuring high safety, making it difficult for the fingers to get tired, and further opening the throttle valve to the opening before returning to the idle rotation opening. If you want to set, readjustment is unnecessary, and even if the required maximum (full open) tension amount of the cable is different, the change of the components can be suppressed to unnecessary or minimal, and the sub lever can be expected. It is possible to prevent unintentional movements, thereby increasing versatility and keeping the equipment cost low, and in addition, productivity, reliability, product price Improvement of may also aim.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a brush cutter adopting an embodiment of a hand lever device according to the present invention.
FIG. 2 is a horizontal sectional view of the hand lever device shown in FIG.
3 is a cross-sectional view taken along the line III-III in FIG. 2;
4 is a partially cutaway left side view illustrating a state in which the left cover case is removed when the sub lever is in the low speed position and the main lever is in the release position, for explaining the operation of the hand lever device shown in FIG. 1; .
5 is an exploded perspective view showing a sub lever and the like disposed on the right side of the hand lever device shown in FIG. 1. FIG.
6 is a partially cutaway left side view showing a state in which the left cover case is removed when the sub lever is at a high speed position and the main lever is at a set position, for explaining the operation of the hand lever device shown in FIG. 1; .
7 is a left side view showing a state in which the left cover case is removed when the sub lever is in a high speed position and the main lever is in a release position, used for explaining the operation of the hand lever device shown in FIG. 1;
8 is a right side view showing the maximum rotation position of the sub lever when the position limiting member is mounted and held in the first mounting holding mode in the hand lever device shown in FIG. 1;
9 is a right side view showing the maximum rotation position of the sub lever when the position limiting member is mounted and held in the second mounting and holding mode of the hand lever device shown in FIG. 1;
10 is a right side view showing the maximum rotation position of the sub lever when the position limiting member is mounted and held in the third mounting holding mode in the hand lever device shown in FIG. 1;
11 is a right side view showing the maximum rotation position of the sub lever when the position limiting member is mounted and held in the fourth mounting holding mode of the hand lever device shown in FIG. 1;
[Explanation of symbols]
2 Internal combustion engine
16 cable (throttle cable)
20 Case member
27 Long hole
27b Termination
30 Main lever
40 Tension lever
50 Sub lever
57 Stopping pin
60 Integrated rotating part
90 Stopper piece (position limiting member)
91-94 Stopper surface
CV driven member (throttle valve)
J Fixed center point
Oa First rotation axis
Ob Second rotation axis
K attachment point
F Release position

Claims (5)

A main lever (30) that is rotated, a sub-lever (50) that is rotated around the first rotation axis (Oa), and is held stationary at an arbitrary rotation operation position; A tension lever (40) pivoted about a second pivot axis (Ob) disposed on an integral pivot section (60) pivoted integrally with the sub lever (50); and the tension lever A push lever (37) for pushing (40), and a cable (16) for controlling the throttle valve (CV) of the internal combustion engine is connected to the tension lever (40), and the sub lever ( moves the position of the second pivot axis (Ob) by rotational operation of 50), the pressing lever (37) pushing pins which rotates by the rotation operation of the main lever (30) (44 ) in the tension lever (4 ) A said second rotation axis (hand lever device which is adapted to pull said cable (16) by rotating around the Ob) (10),
A position limiting member (90) for limiting the maximum rotation position of the sub lever (50) is provided separately from the sub lever (50), the tension lever (40), and the case member (20). The limiting member (90) is mounted and held in such a manner that its posture can be changed with respect to the case member (20) or the sub lever (50) in order to change the maximum rotation position of the sub lever (50).
By limiting the maximum rotation position of the sub lever (50 ) by the position limiting member (90), the movement of the position of the second rotation axis (Ob) of the tension lever (40) is limited. Thus, a play play gap is formed between the push pin (44) of the push lever (37) and the tension lever (40), and the cable is operated by turning the main lever (30). The hand lever device according to (16), wherein the maximum amount of tension is limited. A stop pin (57) protrudes from the sub lever (50), and an arc-shaped elongated hole is inserted into the outer surface of the case member (20) so as to be movable. 27), and the position restricting member (90) is mounted and held on the terminal end portion (27b) of the elongated hole (27) viewed in the rotation direction of the sub-lever (50). Item 10. The hand lever device according to Item 1 . The position limiting member comprises a stopper piece (90) having a cross-shaped or convex cross section having a plurality of stopper surfaces (91, 92, 93, 94) having different projecting lengths from the fixed center point (J). The hand lever device according to claim 1 or 2 , wherein the hand lever device is provided. When the main lever (30) is in the release position (F) where the rotation operation is not performed, the tension lever (40) and the cable (16) are located wherever the rotation operation position of the sub lever (50) is. The hand lever device according to any one of claims 1 to 3 , wherein the position of the coupling point (K) with the head is constant. The position of the coupling point (K) when the main lever (30) is in the release position (F) is set on the first rotation axis (Oa). To 4. The hand lever device according to any one of 4 to 4 .

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