JP4547059B2 - 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 at hand. 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, and the opening degree of the throttle valve is adjusted via a throttle cable by swinging the throttle lever. Have been to. 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 and 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.
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.
[0008]
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.
[0009]
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.
[0010]
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.
[0011]
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).
[0012]
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.
[0013]
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.
[0014]
Here, the position of the connecting point between the tension lever and the cable when the main lever is in the release position is set on the first rotation axis that is the rotation fulcrum of the sub lever, and the rotation of the sub lever No matter where the operation position is from the high speed side to the low speed side, the position of the coupling point between the tension lever and the cable is made constant, so even when the sub lever is operated to rotate during idling, The cable does not move, and therefore the throttle valve also keeps the idle rotation opening, so that the idle rotation speed does not fluctuate and becomes stable, and the cable does not sag. Becomes difficult to come off from the connecting part, etc., and as a result, the reliability increases and the commercial value is improved.
[0015]
[Problems to be solved by the invention]
By the way, when the opening degree control of the carburetor throttle valve of the internal combustion engine mounted on the working machine such as the hedge trimmer or the brush cutter is performed by the hand lever device as described above, the following problems may occur. was there.
That is, when starting (starting up) the internal combustion engine, it is usually necessary to release the hand lever device in order to operate a recoil starter or the like. Therefore, when starting the engine, the main lever is in the release position. In other words, regardless of whether the sub lever is in the low speed position or the high speed position, in other words, depending on the rotation operation position of the sub lever, the pulling amount of the cable does not change, and the opening degree of the throttle valve is minimum open. Degree (idle rotation opening).
[0016]
For this reason, in an internal combustion engine, in general, the startability can be improved by increasing the intake air amount and the fuel supply amount by making the opening degree of the carburetor throttle valve larger than the idle rotation opening degree at the time of starting. Regardless, in the hand lever device, the opening degree of the throttle valve cannot be increased from the idling rotation opening degree, and therefore the startability cannot be improved.
[0017]
The present invention has been made to meet the above-mentioned demands, and the 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 If you want to set the degree of opening, you can eliminate the need for readjustment and prevent the sub-lever from causing unexpected movement, which can improve productivity, reliability, product value, etc. During specific operations such as starting, the cable can be pulled by the sub lever even when the main lever is in the released position, so that startability can be improved. It is to provide a hand lever device which is to so that.
[0018]
[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 that is held stationary at the operation position, and a tension lever that is pivoted about a second pivot axis that is disposed on an integral pivot that is pivoted together with the sub-lever; A push lever that pivots in conjunction with the pivot of the main lever; a push pin that is provided on the push lever and pivots the tension lever; A position limiting means for limiting the maximum rotation position of the sub lever, and a cable for controlling the driven member is connected to the tension lever, and the tension lever is moved to the second position by the main lever. The cable is pulled by rotating about the axis.
[0019]
And when the main lever is at the set position on the sub lever. The pulling lever is pushed by the push pin by turning the push lever in conjunction with the turning of the main lever, The maximum tensile amount of the cable From start to end In addition to the normal restricted state that restricts, also when the main lever is in the release position Rotate the tension lever with the push pin It is characterized in that a restriction releasing state in which the cable can be pulled by a predetermined amount can be taken.
[0020]
In a preferred aspect of the present invention, the position restricting means is provided on the sub-lever, and is provided on an operation member that can take two positions of a non-operation position and an operation position, and a case member of the hand lever device. A stopper member that causes the sub-lever to take the normal restriction state when the operation member is in the non-operation position, and causes the sub-lever to take the restriction release state when the operation member is in the operation position; Consists of.
[0021]
In this case, in a more specific preferable aspect, the operation member includes a push rod that is slidably fitted into the sub lever, and a locking piece that is provided so as to project laterally from the push rod. And a biasing means for constantly biasing the push rod in a direction to take the non-operation position, and the stopper member has a wide guide groove into which the locking piece is loosely inserted, And a narrow guide groove that is provided continuously in the length direction of the wide guide groove and allows the push rod to pass therethrough but does not allow the locking piece portion to pass therethrough.
In another preferable aspect of the hand lever device according to the present invention, when the main lever is in the release position where the main lever is not operated to rotate, the pull lever, the cable, The position of the coupling point is made constant.
[0022]
In a more specific preferred aspect, the position of the coupling point when the main lever is in the release position is set on the first rotation axis.
A typical but non-limiting application of the hand lever device according to the present invention is to use it for controlling the opening of a throttle valve of an internal combustion engine. In this case, when the internal combustion engine is started, The sub lever is made to take the restriction release state.
[0023]
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 or the like is set in advance so that (play) does not occur. When the main lever is rotated to the set position and the sub lever is rotated to the desired position, the cable is pulled, and accordingly The throttle valve is rotated in the opening direction from the minimum opening (idle rotation opening), and is adjusted to the opening corresponding to the rotation operation position of the sub lever.
[0024]
When the position restricting means takes the normal restricting state, in other words, when the operating member is in the non-operating position, a range in which the sub lever and the operating member can be rotated is, for example, the stopper member. It is a range from the start end portion (low speed position) to the end portion (high speed position) of the provided wide guide groove, and the start end portion and the end portion of the wide guide groove serve as a stopper.
[0025]
Accordingly, during normal operation except for specific operation such as start-up, if the operation member is set to the non-operation position, substantially the same as the previously proposed hand lever device (Japanese Patent Application No. 11-153802), The position of the connecting point of the tension lever and the cable when the main lever is in the release position is set on the first rotation axis that is the rotation fulcrum of the sub lever, and the rotation operation position of the sub lever is high speed. Since the position of the connecting point between the tension lever and the cable is made constant at any position from the low speed side to the low speed side, the sub lever can be rotated when idling when the main lever is in the release position. Even so, the cable does not move, and therefore the throttle valve also keeps the idle rotation opening, so that the idle rotation speed does not fluctuate and is stable. Ri, also, since not cause slack in the cable, the cable is hardly disengaged from the connecting portion or the like, as a result, reliability is increased, thereby improving the commercial value.
[0026]
On the other hand, when the position restriction means takes the restriction release state, in other words, when the operation member is set to the operation position, the sub lever and the operation member are, for example, the wide width provided in the stopper member. It is possible to turn the guide groove beyond the end portion (high speed position) of the guide groove to the narrow guide groove side, and the rotation operation range of the sub-lever is expanded as compared with the normal operation.
For this reason, when the operation member is moved to the operation position and the sub lever is rotated from the high speed position in a direction to further increase the opening degree in a specific operation such as start-up, with the main lever in the release position. The tension lever (rotation fulcrum = second rotation axis) is moved in the same direction together with the sub lever, whereby the cable is pulled and the opening of the throttle valve is larger than the idle rotation opening. As a result, the intake air amount and the fuel supply amount of the internal combustion engine are increased, and the startability of the engine is improved.
[0027]
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 an embodiment of a 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.
[0028]
In the present embodiment, the throttle valve CV is normally urged in the direction of the minimum (idle rotation) opening degree 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 above-mentioned conventional one, and when it is pulled from the 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.
[0029]
The hand lever device 10 includes a case member 20 that is externally fitted and fixed near the front end of the rear grip portion 11 of the bar handle 7, and one end of the case lever 20 is connected to the throttle valve CV. 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 disposed to pull the throttle cable 16 inserted through the outer tube 17 of the Bowden cable 15 (FIG. 2). To FIG. 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.
[0030]
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.
[0031]
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.
[0032]
The gear portion 36 formed on the main lever 30 has a third pin-shaped support shaft that protrudes from the right cover case 22. 39B A gear portion 38 provided on a lower end boss portion 37A of a generally C-shaped push lever 37 that is loosely fitted to the outer periphery is meshed with the main lever 30 (the operation portion 32 thereof) in FIG. When the pivoting operation (rotation angle α) is performed from the release position F as indicated by ま で to the set position S close to the rear grip portion 11 as indicated by the solid line, the push lever 37 is Said Third pin spindle 39B Rotate clockwise around 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.
Further, when the main lever 30 is rotated from the release position F to the set position S, the intermediate portion of the push lever 37 is in contact with a front end surface 42a of a vertical piece portion 42 of the tension lever 40 described later. Accordingly, a push pin 44 serving as a turning point for projecting the tension lever 40 clockwise in FIG. 4 is provided.
[0033]
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 cylindrical protrusion 22a. The sub-lever 50 is disposed outside the cylindrical protrusion 22a. A fitting hole 51A having a non-circular cross section (both sides parallel chamfering type) is formed in the base end side boss portion 51 provided at the lower end of the arm portion 50A having a U-shaped cross section of the sub-lever 50, and the fitting hole 51A. The fitting convex portion 62 formed on the shaft portion 61 of the integral rotating portion 60 that is pivotally supported by the bearing hole 26 formed in the right cover case 22 is fitted, and is integrally rotated by the screw 53. The sub-lever 50 is connected to the first rotation axis Oa () by pushing back and forth a rotation operation portion 52 with a non-slip groove protruding leftward from the upper end of the arm portion 50A. The screw 53 is rotated back and forth with the center axis of the screw 53 as a fulcrum.
[0034]
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.
In this embodiment, the sub lever 50 and the right cover case 22 are provided with a push operation member 91 and a stopper member 27 that constitute position limiting means 90 for limiting the maximum rotation position of the sub lever 50, respectively. It has been.
[0035]
As can be understood with reference to FIGS. 3 and 5, the push operation member 91 has a small-diameter insertion hole 72 provided in the insertion support portion 54 on the upper portion of the arm portion 50 </ b> A of the sub lever 50 and its intermediate portion. And a push rod 93 that is slidably inserted into a guide hole 73 provided in a guide plate portion 57 projecting from the guide plate. A cylindrical push button portion 94 that is loosely inserted into a large-diameter hole 71 formed in the upper portion of the fitting insertion holding portion 54 is fixed to the upper end portion of the push rod 93. A C-shaped or ring-shaped spring receiving member 98 that is locked at the lower end of the small-diameter insertion hole 72 of the fitting insertion support portion 54 is fixed to the portion, and further, the lower end portion of the push rod 93 is A short cylindrical locking piece 95 is fixed.
Further, between the spring receiving member 98 of the push rod 93 and the guide plate portion 57, the push rod 93 is always upward (the push button portion 94 projects upward from the large-diameter hole 71). A compression coil spring 96 as an urging means is urged in the direction.
[0036]
On the other hand, the stopper member 27 protrudes rightward from the overhanging portion 22A of the right cover case 22 as can be understood by referring to FIG. 6 in addition to FIGS. A relatively wide guide groove 28 having a relatively wide width is formed by an arcuate plate portion centered on the axis Oa, and the locking piece portion 95 of the push rod 93 is loosely inserted from the rear side toward the front side. In addition, a narrow guide groove 29 having a relatively narrow width that allows the push rod 93 to pass therethrough but does not allow the locking piece portion 95 to pass therethrough is formed.
[0037]
The start end portion 28a and the end end portion 28b of the thick guide groove 28 (also the start end portion 29a of the narrow guide groove 29) serve as stoppers for stopping the locking pieces 95 that are swung together with the sub lever 50. The end portion 29 b of the narrow guide groove 29 serves as a stopper for stopping the push rod 93 that is swung together with the sub lever 50.
[0038]
Therefore, in this embodiment, as shown in FIGS. 3, 4, 7, and 8, when the operator does not press the push button portion 94 (the push operation member 91 is in the non-operation position M). The locking piece 95 is in the wide guide groove 28, and the sub lever 50 has the locking piece 95 from the low speed position L closest to the rear. 28 to the high speed position H where the terminal portion 28b is brought into contact with and stopped. The maximum tensile amount of the cable 16 is limited. It is rotated by the opening degree θa (normally limited state).
[0039]
On the other hand, when the push button portion 94 is pressed (when the push operation member 91 is at the operation position N), as shown in FIG. 3 (virtual line), FIG. 10, and FIG. Since the stop piece 95 is pulled downward from the wide guide groove 28, the sub lever 50 is further brought into contact with the end portion 29 b of the narrow guide groove 29 from the high speed position H. It is possible to make an extra rotation by the opening degree θb until it is stopped at the extended position Z (limit release state).
[0040]
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.
[0041]
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. A tip 17a 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, The throttle cable 16 extends straight from the locking portion 18 and is connected to the bottom 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.
[0042]
The lock lever 80 disposed on the left cover case 21 side is a palm that grips the rear grip portion 11 so as to be close to the upper surface of the rear grip portion 11, and is clockwise in FIG. A linear operation unit 81 that is rotated and extends rearward and obliquely upward, a boss portion 82 that is loosely fitted on a fourth pin-shaped support shaft 83A protruding from the left cover case 21, and the push button A locking portion 84 that is locked by the locking locking portion 47 provided at the distal end portion of the moving lever 37. One end 85 a of the locking portion 84 is biased counterclockwise by a torsion coil spring 85 locked to the case member 20.
[0043]
Therefore, when both the main lever 30 and the lock lever 80 are in the release position F as shown in FIGS. 4 and 9, the locking portion 84 is rotated in cooperation with the main lever 30. Abutting on the locking latch portion 47 of the push lever 37, the unexpected rotation thereof is prevented.
Further, a slide-type stop switch 67 for stopping the engine 2 by interrupting the discharge of the spark plug 5 of the internal combustion engine 2 between the upper surface portions of the left cover case 21 and the right cover case 22. Is provided.
[0044]
In the hand lever device 10 of the present embodiment configured as described above, the push operation member 91 is moved to the non-operation position without touching the push button 94 during normal operation except during a specific operation such as start-up. M is set so that the position restriction means 90 is in the normal restriction state. Thereby, the range in which the sub lever 50 can be rotated is equal to the length of the wide guide groove 28 into which the locking piece 95 is loosely inserted, that is, the start end portion 28a of the wide guide groove 28. This is a range (opening angle θa) from (low speed position L) to the end portion 28b (high speed position H).
[0045]
Here, even when the main lever 30 is at the release position F as shown in FIGS. 4 and 9 (during idling), the throttle cable 16 that controls the throttle valve CV does not loosen (play). The cable length or the like is set in advance, and the position of the coupling point K between the tension lever 40 and the cable 16 is set on the first rotation axis Oa that is the rotation fulcrum of the sub lever 50, and The position of the coupling point K is constant (non-moving) no matter where the rotation operation position of the sub lever 50 is between the low speed position L side (FIG. 4) to the high speed position H side (FIG. 7). Even when the sub lever 50 is turned when the lever 30 is idling when the lever 30 is in the release position F, the throttle cable 16 does not move. Therefore, the throttle valve CV is also idled. Since the rotation speed is maintained, the idling speed does not fluctuate and becomes stable, and since the throttle cable 16 is not slackened, it is difficult to come off from the connecting portion and the like. As a result, reliability is increased. The product value is also improved.
[0046]
As shown in FIG. 7, 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 is pushed. The pulling 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 pulling lever 40 and the cable 16 is on the first rotation axis Oa. The cable 16 is pulled and the throttle valve CV is rotated in the opening direction from the minimum opening (idle rotation opening), and the opening corresponding to the rotation operation position of the sub lever 50 is performed. It is adjusted to a degree (maximum opening in the case of FIG. 7).
[0047]
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. Accordingly, as shown in FIG. 9, since the throttle cable 16 is always urged in the closing direction of the throttle valve CV, the tension lever 40 rotates in the opposite direction (counterclockwise). The connecting point K between the tension lever 40 and the throttle cable 16 is returned to the position on the first rotation axis Oa, the throttle cable 16 is in the non-operating state, and the throttle valve CV is in the idle state. Returning to the rotational opening, the engine 2 is in an idling state.
Here, if the working machine 1 is configured to transmit the engine rotational driving force to the working unit 3 including the cutting blade 13 and the like via a centrifugal clutch (not shown), the centrifugal clutch is in a disconnected state and the working unit 3 Since the power transmission to is cut off, the operation of the cutting blade 13 and the like is immediately stopped.
[0048]
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 to the opening degree before the main lever 30 is released, and the sub-lever 50 does not need to be readjusted.
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. When it is possible to return to the minimum opening (idle rotation opening) to ensure high safety, to prevent the fingers from getting tired, and to set the throttle valve CV to the opening before returning to the idle rotation opening There is no need for readjustment.
[0049]
On the other hand, when starting the engine 2, as shown in FIG. 3 (imaginary line), FIG. 10, and FIG. Thus, the push operation member 91 is set to the operation position N, and the sub lever 50 is rotated from the low speed position L to the high position H to the extended position Z side. As a result, the second rotation axis Ob that is the rotation fulcrum of the tension lever 40 moves in the same direction together with the sub lever 50, and the front end surface 42 a of the tension lever 40 moves to the push pin 44. The tension lever 40 is rotated in the clockwise direction in FIG. 10 so as to be brought into contact with and pushed by this, whereby the cable 16 is pulled by the starting tension length Q, and the opening degree of the throttle valve CV is increased. Is made larger than the idle rotation opening, and as a result, the intake air amount and the fuel supply amount of the internal combustion engine 2 are increased, and the startability of the engine 2 is improved.
[0050]
Here, after the engine 2 is started, when the sub lever 50 is returned between the high speed position H to the low speed position L with the main lever 30 in the release position F, the throttle cable 16 is connected to the throttle valve. The throttle valve CV is pulled by an urging means such as a spring attached to the CV, and the throttle valve CV returns to the idle rotation opening.
[0051]
When the engine rotational driving force is transmitted to the working unit 3 including a cutting blade or the like via a centrifugal clutch, the amount of tension of the throttle cable 16 (starting tensile length Q) when starting the engine is If the rotational speed at which the centrifugal clutch is actuated (ON) is set slightly smaller than the amount of pulling at which the centrifugal clutch is obtained, it is safe because power transmission to the working unit 3 such as the cutting blade 13 is not performed at the time of starting.
[0052]
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.
Furthermore, 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.
[0053]
【The invention's effect】
As understood from the above description, according to the hand lever device of the present invention, the opening degree of the throttle valve or the like as the driven member can be controlled via the cable and can be easily held at the 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 the opening before returning the throttle valve to the idle rotation opening It is possible to eliminate readjustment and to prevent unexpected movement of the sub-lever, so that productivity, reliability, product value, etc. can be improved, and at the time of starting, etc. During the specific operation, the cable can be pulled by the predetermined amount by the sub lever while the main lever is in the release position, so that the startability and the like can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a brush cutter employing 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 showing 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, used for explaining the operation of the hand lever device shown in FIG. .
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 enlarged plan view for explaining the configuration and operation of sub-lever and position limiting means arranged on the right side of the hand lever device shown in FIG. 1; FIG.
7 is a partially cutaway enlarged 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. Figure.
8 is a right side view 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;
9 is a partially cutaway enlarged 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 in a release position, for explaining the operation of the hand lever device shown in FIG. Figure.
10 is a partially cutaway enlarged left side view showing a state in which the left cover case is removed when the sub lever is in the maximum extended position and the main lever is in the released position, used for explaining the operation of the hand lever device shown in FIG. Plan view.
FIG. 11 is a right side view when the sub lever is in the maximum extension position and the main lever is in the release position, used for explaining the operation of the hand lever device shown in FIG. 1;
[Explanation of symbols]
2 Internal combustion engine
10 Hand lever device
16 Throttle cable (cable)
20 Case member
27 Stopper member
28 Wide guide groove
29 Narrow guide groove
30 Main lever
40 Tension lever
50 Sub lever
60 Integrated rotating part
90 Position limiting means
91 Operation members
93 Push rod
94 push button
95 Locking piece
96 Compression coil spring (biasing means)
CV driven member (throttle valve)
M Non-operation position
N Operation position
F Release position
S Set position
Oa First rotation axis
Ob Second rotation axis
K attachment point

Claims (6)

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) rotated about a second rotation axis (Ob) disposed on an integral rotation part (60) rotated integrally with the sub lever (50), and the main lever A push lever (37) that rotates in conjunction with the rotation of (30), a push pin (44) that is provided on the push lever (37) and rotates the tension lever (40), and Position limiting means (90) for limiting the maximum rotation position of the sub lever (50), and a cable (16) for controlling the driven member (CV) is connected to the tension lever (40). The main lever (30) A lever the (40) second rotation axis hand lever device which is adapted to pull said cable (16) by rotating about the (Ob) (10),
When the main lever (30) is in the set position (S), the position restricting means (90) is connected to the sub lever (50) in conjunction with the rotation of the main lever (30). 37) is rotated to push the pull lever (40) by the push pin (44), thereby limiting the maximum pull amount of the cable (16 ) from the start end (28a) to the end end (28b). In addition to the normal restricted state, the cable (16) is rotated by rotating the tension lever (40) by the push pin (44) even when the main lever (30) is in the release position (F). A hand lever device characterized in that a restriction release state in which a predetermined amount (Q) can be pulled can be taken.   The position limiting means (90) is provided on the sub-lever (50) and is configured to be capable of taking two positions, a non-operation position (M) and an operation position (N), and the hand When provided in the case member (20) of the lever device (10) and the operation member (91) is in the non-operation position (M), the sub-lever (50) is placed in the normal restricted state, and the operation The stopper member (27) that causes the sub-lever (50) to take the restriction release state when the member (91) is in the operation position (N). Hand lever device.   The operating member (91) includes a push rod (93) slidably fitted into the sub-lever (50), and a lock provided so as to project laterally from the push rod (93). And a biasing means (96) for constantly biasing the push rod (93) in a direction to assume the non-operation position (M). The stopper member (27) The wide guide groove (28) into which the locking piece (95) is loosely inserted, and the longitudinal width of the wide guide groove (28) are continuously provided, and the push rod (93) is passed through the The hand lever device according to claim 2, wherein the locking piece (95) has a narrow guide groove (29) through which the locking piece (95) does not pass. 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) can be used regardless of the rotation operation position of the sub lever (50). ) and the hand lever device according to any one of claims 1 to 3, the position of the coupling point (K) is characterized in that it is so as to be constant. Claim 4 wherein said coupling point in time the main lever (30) is in the release position (F) the position of (K), characterized in that it is set on the first pivot axis (Oa) The hand lever device described in 1. The hand lever device according to any one of claims 1 to 5, wherein the driven member is a throttle valve (CV) of an internal combustion engine (2).

Images