JP2000175534A - Hand lever device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hand lever device capable of ensuring high safety and making hands and fingers scarcely tired and excellent in operating efficiency by installing a specific pushing and moving part for pushing and moving a main lever in a lever piece shaft. SOLUTION: This hand lever device 10 is obtained by installing a main lever 30 for performing operations to move from an opened position separated from a gripping part 11 to a closed position U adjacent to the gripping part 11, a sub-lever 51 held at an optional position from the minimum set position to the maximum set position H and a turning back member 45 freely rotatably held in a lever piece shaft 60 integrally provided in the sub-lever 51. The hand lever device 10 is further equipped with a pushing and moving part 70 for pushing and moving the main lever 30 so as to move from the opened position to the closed position U when moving the sub-lever 51 from the side of the maximum set position H to the minimum set position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand lever device for operating a driven member such as a carburetor throttle valve of an internal combustion engine via a cable, and more particularly to a working machine such as a hedge trimmer and a bush cutter. The present invention relates to a hand lever device which is disposed near a grip portion of a handlebar and is suitable for opening and closing the throttle valve via a throttle cable.

[0002]

2. Description of the Related Art For example, in a working machine such as a hedge trimmer or a bush cutter driven by a working unit such as a cutting blade by an internal combustion engine, the output of the internal combustion engine is adjusted at hand. A hand lever device for adjusting a carburetor throttle valve opening of the internal combustion engine is disposed near a grip portion such as a U-shaped handle or a bar handle.

[0003] This hand lever device usually has a throttle trigger (throttle lever) which is operated by a finger of an operator. By rotating this throttle lever, the throttle valve is opened via a throttle cable. The opening is adjusted. Normally, the throttle valve is normally biased in the direction of the minimum opening (idling rotation opening), and is held at the idle rotation opening in a natural state, and play is provided when the throttle cable is pulled for a predetermined length or more. Then, it is started to open from the idle rotation opening to the high-speed rotation side.

In such a hand lever device for adjusting the opening degree of a throttle valve, when the throttle lever is released from a rotating operation state, the lever is automatically moved together with the throttle valve to its original position (idle rotation). (Opening degree), and a fixed type in which the throttle lever can be held at a desired rotational operation position even after releasing a finger. (See Japanese Utility Model Publication No. 57-19944).

In the automatic return type, when the finger is released from the throttle lever, the engine automatically returns to the idling state, and the engine rotational driving force is transmitted to a working unit including a cutting blade or the like via a centrifugal clutch. Work machine,
Since the centrifugal clutch is disengaged and power transmission to the working unit is cut off, in the event of an unexpected situation, the working unit can be stopped by immediately returning the throttle valve to the idle rotation opening. On the other hand, while the advantage that safety is enhanced is obtained, the throttle lever must be always held by a finger to maintain a desired rotational operation position, so that it is difficult to use the intermediate opening degree, the finger becomes tired, and the operation amount ( Rotation speed) is not constant.

In general, in consideration of usability, a rotary operation lever operated by a finger, such as a throttle lever, takes only two positions of a release position and a set position (grip position) without taking an intermediate opening degree. When the throttle valve is set to the intermediate opening (partial opening) or fully opened (WOT), it is preferable to set the same rotation operation position (set position) for better operability. Conceivable.

On the other hand, the fixed type can solve the problem of the automatic idle rotation opening return type, and can always hold the throttle lever at a desired rotational operation position even if the user releases the throttle lever. Although there are advantages such as the freedom of fingers and ease of work, there is a need for another operation to release the position holding function of the throttle lever in the event of an unexpected situation, and the working unit is immediately stopped Therefore, there is a problem in that the safety is inferior to that of the automatic idle rotation opening return type.

In any of the above-mentioned 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. In many cases), the rotational operation position of the throttle lever must be readjusted, and the operation is troublesome, and there is still room for improvement in operability.

In order to solve or attain the conventional problems and problems relating to the above-mentioned hand lever device, the applicant of the present invention has disclosed, for example, Japanese Patent Application No. 7-108340 (Japanese Patent Application Laid-Open No. 8-303262). ), A main lever and a sub-lever that are swingably operated, and a cable connected to a driven member is pulled by the main lever via a folding member such as a pulley, and A hand lever device has been proposed in which the folding member is moved by the sub lever.

According to such a hand lever device, the opening of a throttle valve or the like as a driven member can be adjusted via a cable, can be easily held at a desired opening, and can be immediately reduced to a minimum opening (idle (Rotational opening) to ensure high safety, reduce finger fatigue, and eliminate the need for readjustment if you want to set the throttle valve to the opening before returning to idle rotation. Can be obtained.

[0011]

However, in the hand lever device proposed above, the amount of pulling of the cable depends on the swing operation angle of the main lever. There is a disadvantage that the swing operation angle of the main lever must be relatively large. Accordingly, a relatively large space is required between the grip portion of the handle and the main lever in order to obtain a required swing operation angle of the main lever. In addition, the main lever that protrudes outward from the handle is particularly susceptible to damage by being caught on something during transportation or work, etc. Improvement has been demanded as a factor for reducing workability and operability.

SUMMARY OF THE INVENTION The present invention has been made in order to meet the above-mentioned demand, and an object of the present invention is to adjust the opening degree of a carburetor throttle valve or the like as a driven member through a cable and to obtain a desired opening degree. Can be easily held, and
When you can quickly return to the minimum set position (idle rotation opening) to ensure high safety, reduce finger fatigue, and set the throttle valve to the opening before returning to the idle rotation opening To provide a hand lever device capable of eliminating the need for readjustment, and further minimizing the main lever from being damaged or obstructed during transportation or work. It is in.

[0013]

In order to achieve the above object, a hand lever device according to the present invention basically comprises a moving operation from an open position away from a grip portion to a closed position close to the grip portion. A main lever, a sub-lever held at an arbitrary position from a minimum setting position to a maximum setting position, and a folding member rotatably held on a lever piece shaft provided integrally with the sub-lever. Wherein a cable for pulling the driven member is operatively connected to the main lever in a state where the cable is hung around the folding member, and moves the main lever from the open position to the closed position. Pulling the cable through the folding member, and moving the sub-lever from the minimum set position to the maximum set position. It is the folded member to move in a direction of pulling the cable by.

When the sub-lever is moved from the maximum set position to the minimum set position, the lever piece shaft is pushed to move the main lever from the open position to the closed position. And a pushing portion such as a cam that moves.

In a preferred aspect of the hand lever device according to the present invention, the main lever includes an operating portion operated by a finger so as to approach the grip portion, a rotating base portion pivotally supported by a support shaft, and the turning portion. The rocking lever portion protrudes upward from the moving base end portion, and the pressing portion pushes the rocking lever portion, and the cable is connected to a distal end portion of the rocking lever portion.

In another preferred embodiment, there is provided a biasing means for constantly biasing the main lever in the open position direction. A typical, but non-limiting application of the hand lever device according to the present invention is for use in adjusting the opening of a carburetor throttle valve of an internal combustion engine.

In a preferred embodiment of the hand lever device according to the present invention configured as described above, when the sub-lever is rotated from the maximum setting position to the minimum setting position, a lever piece shaft is moved together with the sub-lever. Is rotated, and a pushing portion such as a cam provided on the lever piece shaft pushes the main lever to rotate from the open position side to the closed position.

When the sub-lever is turned to the minimum set position, the main lever is automatically turned to the closed position close to the grip. In this case, since the sub-lever is held at an arbitrary rotation operation position, the main lever is in the closed position unless the sub-lever is rotated toward the maximum set position side. It is held immovable. In this state, the cable (carburetor throttle cable) connected to the driven member (throttle valve) is pulled by the main lever for a predetermined length, the play is eliminated, and the driven member (carburetor throttle valve) is removed. ) Is maintained at the minimum set position (idle rotation opening).

Next, when the sub-lever is rotated by an arbitrary angle from the minimum setting position, the lever piece shaft is also rotated, and the folding member is forcibly moved in a direction to pull the cable, As a result, the cable is further pulled through the folding member, and the driven member is moved to the minimum set position (idle opening).
Is moved in the opening direction to adjust the opening degree.
In such a state, the pushing portion of the lever piece shaft that has pushed the main lever is separated from the main lever, but at this time, the main lever is grasped and thus remains in the closed position.

Further, in this case, the cable is pulled by the folding member in a state of being looped around the folding member, so that the cable is pulled twice as long as the moving amount of the folding member (by the pulley). This is the same as the enlargement of the displacement). For this reason, the amount of operation of the sub-lever required to adjust the opening of the driven member (carburetor throttle valve), that is, the amount of movement of the folding member, can be small,
Also from this point, the size and weight of the device can be reduced.

Here, even if you release your hand from the sub-lever,
The sub-lever is held immovably in its operating position by position holding means provided on the sub-lever, and the carburetor throttle valve is held at its adjusted opening (set opening). Thereby, the burden on the fingers is reduced.

In the state where the opening degree of the driven member (carburetor throttle valve) is adjusted as described above, when it is desired to greatly reduce the engine speed immediately after an unexpected situation occurs, for example, Release the lever. In such a case, the pushing portion of the lever piece shaft is separated from the main lever, and the cable is constantly urged in the closing direction of the driven member (carburetor throttle valve). By providing a biasing means for biasing the lever in the opening direction), the main lever is pulled in a direction away from the grip portion and opened to the open position, and the driven member (carburetor throttle valve) is opened. The engine returns to the minimum set position (idle rotation opening) and enters the idling state.

Here, in the case of a working machine in which the engine rotational driving force is transmitted to a working section comprising a cutting blade or the like via a centrifugal clutch, the centrifugal clutch is turned off and the power to the working section is reduced. Since the transmission is interrupted, the working unit such as the cutting blade is immediately stopped. Once the main lever is released in this way, when the main lever is rotated again to the closed position close to the grip portion, the play of the cable is eliminated, and the sub-lever is held at the previous rotational operation position. Since the throttle valve remains open, the throttle valve is returned to the opening before the main lever was released, so that the sub-lever need not be readjusted.

As described above, in the hand lever device according to the present invention, the opening of the throttle valve or the like as the driven member can be adjusted via the cable, can be easily held at the desired opening, and can be immediately performed. When the throttle valve can be returned to the minimum set position (idle rotation opening), high safety can be ensured, fingers can be hardly tired, and the throttle valve should be set to the opening before returning to the idle rotation opening. No need for readjustment.

When not in use (when not working), the sub-lever is returned to the minimum set position, and accordingly, the main lever is returned to the closed position close to the grip portion as described above, Also, at the time of use (at the time of work), the main lever is held in the closed position while the main lever is held unless the main lever is released while the sub-lever is rotated to the maximum set position side. In addition, the main lever can be effectively prevented from being damaged or obstructed during transportation or work.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a brush cutter to which an embodiment of a hand lever device according to the present invention is applied. The illustrated brush cutter 1 includes a working unit 3 including a cutting blade 13, a safety cover 14, and the like at a tip end of a cylindrical bar handle (operation rod) 7 having grip portions 11, 12 arranged side by side at a predetermined interval. A recoil starter 6 and a fuel tank 4 as power sources for driving the cutting blade 13 via a drive shaft (not shown) inserted into the bar handle 7 are attached to the rear end side. Internal combustion engine (small air-cooled two-cycle gasoline engine) 2
The internal combustion engine 2 is provided with a carburetor throttle valve CV (driven member) and a spark plug 5.

In this embodiment, the throttle valve CV
Is always urged in the minimum (idle rotation) opening direction, and play occurs when a later-described throttle (inner) cable 17 (FIG. 5) connected thereto is pulled from a non-operation state by a predetermined length or more. It is made to start to open from the said minimum opening degree lost. And the grip 1
The hand lever device 10 of the present embodiment is attached to the vicinity of the grip portion 11 on the rear side, which is usually gripped by the right hand, of the handle levers 10 and 12 in order to adjust the opening of the throttle valve CV.

The hand lever device 10 is shown in FIGS.
As shown in FIG.
And a case member 20 externally fitted and fixed near the rear grip portion 11. The throttle cable 17 inserted through the outer tube 16 of the Bowden cable 15 connected to the throttle valve CV is inserted into the case member 20. The pulling main lever 30 is held so as to be swingable.

The case member 20 has a three-part structure including a right cover case 21, an intermediate cover case 22, and a left cover case 23 made of synthetic resin (FIG. 6).
reference). The right cover case 21 and the left cover case 23 each have a substantially square dish-like appearance, and screws 24, 24, 2
5, the opposing surfaces 21A, 21A, 22A, 22A having a semicircular cross section provided at the front and rear ends thereof (FIG. 6, FIG.
7 is brought into contact with the outer peripheral surface of the bar handle 7, and is externally fitted and fixed so as to sandwich the bar handle 7.

The main lever 30, which is swingably held by the case member 20, is made of synthetic resin.
As can be clearly understood from FIG. 8, the linear operation part 31 and the support shaft 35, which are rotated by fingers so as to approach the lever receiving part 11 a provided at the lower end of the rear grip part 11, are loosely attached to the support shaft 35. The swing base 32 externally fitted, and the swing base 3
2 comprises a swing lever portion 33 which extends obliquely upward and is curved in accordance with the outer peripheral shape of the bar handle. The right end of the support shaft 35 is located at the lower rear end of the right cover case 21. The left end portion is press-fitted into an insertion hole 22d formed in the intermediate cover case 22 and loosely inserted into the insertion hole 23d formed in the left cover case 23. Has been passed.

The main lever 30 swings by an angle α (FIG. 2) from an open position (FIG. 11) away from the rear grip portion 11 to a closed position (FIG. 10) close to the grip portion 11. A torsion coil spring 80 is mounted on the outer periphery of the cylindrical base 32 so that the main lever 30 is always urged in the open position D direction. The torsion coil spring 80 has one end locked to the swing lever 33 and the other end locked to the internal rib 21 a of the case member 20.
3 is urged clockwise in FIG.

Here, the throttle cable 17 is pulled by the main lever 30 having the above-described structure to increase the pulling amount mechanism 40.
And it is configured to be pulled through a pulley 45 (FIGS. 5 and 8) which is a folded member. 7 and 8, the tension-enlarging mechanism 40 includes a bearing hole 21g provided at a lower portion on the front end side of the right cover case 21 and a shaft supporting portion provided near the center. 2
1f and a lever 41 rotatably fitted to a support shaft 42 whose both ends are supported by a shaft support portion 22f provided on the intermediate cover case 22. The lever 41 has a long half body 41A. An end fitting 19 attached to the tip of the throttle cable 17 is fitted and locked at the tip (left end) of the throttle cable 17.

The distal end (right end) of the short side half body 41B of the lever 41 and the distal end cylindrical portion 33a of the swing lever portion 33 of the main lever 30 are respectively provided with pulleys 45 which are folding members. End fittings 1 attached to both ends of a short cable 18 that is wound around and turned over
9 and 19 are fitted and locked.

In such a configuration, as can be clearly understood with reference to FIG.
When 1) is rotated in a direction approaching the rear grip portion 11, the short-side half body 41B of the lever 41 is pulled rearward via the short cable 18, and the lever 41 is clocked in plan view. The throttle cable 17 is rotated in the circumferential direction, and accordingly, the throttle cable 17 is pulled forward by the long half body 41A of the lever 41 and is pulled out. In this case, the amount of pulling of the throttle cable 17 by the main lever 30 is increased by the lever ratio of the lever 41.

Further, in this embodiment, a position adjusting mechanism 50 for forcibly moving the pulley 45 in a direction in which the throttle cable 17 is pulled (rearward) and holding the pulley 45 immovably at an arbitrary moving position is provided. ing. The position adjusting mechanism 50 has a sub-lever 51 and a lever piece shaft 60 integrally attached to the sub-lever 51, as can be clearly understood with reference to FIGS. As shown in FIG. 9, the lever piece shaft 60 has a U-shaped storage portion 64 for storing the pulley 45, and a serrated shaft portion 6 provided at one end of the storage portion 64.
2, and a cylindrical shaft portion 63 provided on the other end side of the storage portion 64, and an insertion hole 63a into which the pin 46 serving as a rotation support shaft of the pulley 45 is inserted in the storage portion 64. , 6
3b is drilled.

On the side of the storage portion 64 where the cylindrical shaft portion 63 is provided, the main lever 30 is pivoted forward from the open position D to the closed position U. A cam portion 70 as a pushing portion for pushing to protrude is provided. The sub-lever 51 includes a serration shaft portion 62 provided on the lever piece shaft 60 and a serration portion 52 fitted on the outside of the right cover case 21. A screw 55 is provided on the right end of the lever piece shaft 60. (See FIG. 6). The serrated shaft portion 6 on the right end side of the lever piece shaft 60
2 is supported by a bearing portion 21 e provided on the right side of the right cover case 21, and the cylindrical shaft portion 63 on the left end side is supported by the bearing portion 2 provided on the intermediate cover case 22.
The pulley 45 is rotatably supported by a pin 46 in the storage portion 64. Here, the center axis O 'of the pin 46 for supporting the pulley 45 is deviated upward by a predetermined distance E with respect to the rotation axis O of the sub-lever 51 (the center axis of the lever piece shaft 60). The sub-lever 5
By tilting 1 toward the rear side, the pulley 45 is moved in the direction of pulling the throttle cable 17 (rearward).

The sub-lever 51 can be swung from a minimum (low speed) set position L as shown in FIG. 5 to a maximum (high speed) set position H as shown in FIG. A cylindrical push button 53 having an open lower surface is slidably fitted in the upper part of the sub lever 51 in the vertical direction.
The bottomed sleeve 57, which is constantly urged downward, is slidably fitted in the front-rear direction with its bottom protruding downward and in contact with the right shoulder of the right cover case 21. .

On the left side of the lower end of the push button 53, a sawtooth-shaped movable side tooth portion 58 is provided facing upward, and on the upper part of the right cover case 21, it is sufficient to refer to FIGS. As can be seen, the saw-tooth-shaped fixed side teeth 28 with which the movable side teeth 58 mesh are provided so as to draw a circular arc about the rotation axis O of the sub-lever 51 downward and in the front-rear direction. ing.

In the position adjusting mechanism 50 having the above structure, when the push button 53 is pressed, the movable tooth 5
When the meshing state between the gear 8 and the fixed side tooth portion 28 is released, and the push button 53 is pulled to an arbitrary position on the rear side as it is, the sub lever 51 swings rearward, and accordingly, the pulley 45 The throttle cable 17 is moved in the pulling direction (rearward). In this state, when the pressing of the push button 53 is released, the movable side tooth portion 58 and the fixed side tooth portion 28 are meshed again, and the sub lever 51 is moved. And the pulley 45 is held at the rotation operation position at that time.

The right side cover case 21 and the left side cover case 23 have rectangular cutouts 21k and 23k formed in the center of the upper surface thereof, and the ignition plug 5 of the internal combustion engine 2
A slide stop switch 67 for shutting off the power to the engine 2 and stopping the engine 2 is attached so as to be sandwiched therebetween.

When the hand lever device 10 of this embodiment having the above-described configuration is attached to the bar handle 7, the main lever 30, the tension The movable mechanism members such as the amount enlargement mechanism 40, the pulley 45, and the position adjustment mechanism 50 are housed and held, and the intermediate cover case 22 is assembled to the right cover case 21 using screws (not shown).

Next, the right cover case 21 and the intermediate cover case 22, which house and hold movable mechanism members such as the main lever 30, the pulling amount expanding mechanism 40, the pulley 45, and the position adjusting mechanism 50, are provided. The handle 7 is closed so as to sandwich the handle 7 between the assembled body and the left cover case 23. At this time, the bar handle 7
The convex portion 29 provided on the intermediate cover case 22 is fitted into the concave portion 9 provided at the position, and positioning is performed. Thereafter, the right cover case 21, the intermediate cover case 22, and the left cover case 23 are connected to each other. The screw 24,
Fastened at 24,25.

In the hand lever device 10 according to the present embodiment having the above-described structure, as shown in FIG.
When the sub lever 51 is tilted from the maximum set position H side to the minimum set position L, the sub lever 5
1 together with the lever piece shaft 60, the cam portion 70 provided on the lever piece shaft 60 pushes the swing lever portion 33 forward, and the main lever 30
Is rotated from the open position D to the closed position U.

That is, when the sub-lever 51 is turned to the minimum set position L, the main lever 30 is automatically turned to the closed position U close to the rear grip portion 11. In this case, the sub-lever 51 is fixedly held at an arbitrary rotational operation position by the position adjusting mechanism 50 including the movable tooth portion 58 and the fixed tooth portion 28. The main lever 30 is held immovably at the closed position U unless the sub lever 51 is tilted toward the minimum set position L. In this state, the throttle cable 17 connected to the throttle valve CV is pulled by the main lever 30 for a predetermined length, and
The play is eliminated, and the throttle valve CV is maintained at the minimum opening (idling rotation opening).

Next, while holding the rear grip portion 11 and maintaining the main lever 30 in the closed position U,
When the sub-lever 51 is rotated by an arbitrary angle from the minimum setting position L to the rear maximum setting position H, FIG.
As shown at 0, the lever piece shaft 60 also moves rearward, and the pulley 45 is forcibly moved in a direction of pulling the throttle cables 17, 18, whereby the throttle cables 17, 18 are moved. The throttle valve CV is further pulled through the pulley 45 to move the throttle valve CV from the minimum opening (idling opening) to the opening direction, and the opening is adjusted. In such a state,
The cam portion 70 pushing the main lever 30 is separated from the main lever 30.
0 remains in the closed position U because it is gripped.

In this case, since the throttle cable 17 is pulled by the pulley 45 while being wound around the pulley 45, the throttle cable 17 is pulled twice as long as the moving amount of the pulley 45 (dynamic). This is the same as the displacement increase due to the pulley). Therefore, the amount of operation of the sub-lever 51 required to adjust the opening of the throttle valve CV, that is, the amount of movement of the pulley 45, may be small, and from this point, the size and weight of the device can be reduced.

Here, even if the hand is released from the sub-lever 51, the sub-lever 51 is held immovably at its operating position by the engagement of the movable-side tooth portion 58 and the fixed-side tooth portion 28. The CV is held at the adjusted opening (set opening). Thereby, the burden on the fingers is reduced.

In the state where the opening degree of the throttle valve CV is adjusted as described above, when it is desired to drastically reduce the rotation speed of the engine 2 immediately due to, for example, an unexpected situation, the main lever 30 is operated. release. At this time, since the cam portion 70 is separated from the main lever 30 and the throttle cable 17 is constantly urged in the throttle valve CV closing direction (the main lever 30 is connected to the torsion coil spring 80). 11), the main lever 30 is moved to the rear grip portion 11 as shown in FIG.
The throttle cable 17 is returned to the open position D, the throttle cable 17 is returned by that amount, the throttle valve CV returns to the idle rotation opening degree, and the engine 2 enters an idling state.

Here, in the case of a working machine in which the engine rotation driving force is transmitted to a working section composed of a cutting blade or the like via a centrifugal clutch, the centrifugal clutch is turned off and the power to the working section is reduced. Since the transmission is interrupted, the working unit such as the cutting blade is immediately stopped. Once the main lever 30 is released in this way, when the main lever 30 is turned again to the closed position U close to the rear grip portion 11, the play of the throttle cable 17 is eliminated,
Since the sub-lever 51 remains held at the previous rotational operation position, the throttle valve CV is
The opening is returned again to the opening before 0 was released, and readjustment of the sub-lever 51 becomes unnecessary.

As described above, in the hand lever device 10 of the present embodiment, the throttle valve C as the driven member
The degree of opening such as V can be adjusted via the cables 17 and 18 and can be easily maintained at a desired degree of opening, and can be immediately returned to the minimum degree of opening (idle rotation degree of opening), thereby ensuring high safety. In addition to securing the fingers, the fingers can be made less tiring, and further, when it is desired to set the throttle valve CV to the opening before returning to the idle rotation opening, readjustment can be unnecessary.

When the sub-lever 51 is returned to the minimum set position L when not in use (when not working), the main lever 30 is accordingly brought close to the rear grip portion 11 as described above. The main lever 3 is automatically returned to the closed position U, and even during use (during work), unless the main lever 30 is released while the sub lever 51 is rotated to the maximum set position H side.
Since the closed position U is maintained while being gripped, it is possible to effectively prevent the main lever 30 from being damaged or obstructed during transportation or work.

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 the present invention is not limited to the above-described embodiments. Various changes can be made. For example, as the folded member, a non-circular plate-like body or the like can be used in addition to the one using the pulley 45 as described above.

As a mechanism for expanding the amount of tension, in addition to the mechanism using the lever 41 as described above, for example, Japanese Unexamined Patent Publication No.
As described in Japanese Patent No. 35318, a gear or the like can be used. In the present embodiment, the hand lever device 10 is used to adjust the opening of the throttle valve CV of the internal combustion engine 2. However, the hand lever device of the present invention is used for purposes other than adjusting the opening of the throttle valve CV. Needless to say, it can also be used. Further, the hand lever device 10 can be used by being directly attached to not only the bar handle 7 but also a U-shaped handle.

[0054]

As will be understood from the above description, according to the hand lever device of the present invention, the opening of the throttle valve or the like as the driven member can be adjusted via the cable and the desired opening can be easily attained. , And can be immediately returned to the minimum opening (idling rotation opening) to ensure high safety, reduce finger fatigue, and return the throttle valve to the idle rotation opening. When it is desired to set the opening to the previous opening, readjustment can be made unnecessary, and furthermore, the main lever can be minimized from being damaged or obstructed during transportation or work.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a brush cutter in which an embodiment of a hand lever device according to the present invention is employed.

FIG. 2 is a left side view showing an embodiment of the hand lever device according to the present invention.

FIG. 3 is a plan view showing an embodiment of a hand lever device according to the present invention.

FIG. 4 is a right side view showing an embodiment of the hand lever device according to the present invention.

FIG. 5 is an enlarged cutaway left side view showing a state in which a left cover case of the hand lever device of the embodiment is removed.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5;

FIG. 8 is a schematic perspective view showing a position adjusting mechanism and a tension increasing mechanism of the hand lever device according to the embodiment, and parts related thereto;

9A and 9B show a lever piece shaft of the hand lever device according to the embodiment, wherein FIG. 9A is a left side view and FIG. 9B is a plan view.

FIG. 10 is a cutaway left side view showing, in an enlarged manner, a state in which a left cover case is removed, which is used for explaining the operation of the hand lever device of the embodiment.

FIG. 11 is a cutaway left side view showing, in an enlarged manner, a state different from FIG. 10 from which the left cover case is removed, for explaining the operation of the hand lever device of the embodiment.

[Explanation of symbols]

 2 Internal combustion engine 7 Bar handle 10 Hand lever device 11 Rear grip part 17, 18 Throttle cable 30 Main lever 31 Operating part 32 Opening degree base 33 Swing lever part 35 Support shaft 45 Pulley (return member) 51 Sub-lever 60 Lever piece shaft 70 Cam part (pushing part) CV Driven member (carburetor throttle valve) D Open position H Maximum set position L Minimum set position U Closed position 80 Biasing means (torsion coil spring)

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[Procedure amendment]

[Submission date] January 6, 1999 (1999.1.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

However, in the hand lever device proposed above, the amount of pulling of the cable depends on the swing operation angle of the main lever. There is a disadvantage that the swing operation angle of the main lever must be relatively large. Accordingly, a relatively large space is required between the grip portion of the handle and the main lever in order to obtain a required swing operation angle of the main lever. In addition, the main lever that protrudes outward from the handle is particularly susceptible to damage by being caught on something during transportation or work, etc. factors that reduce the workability and operability, improvement thereof has been desired.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

In order to achieve the above object, a hand lever device according to the present invention basically comprises a moving operation from an open position away from a grip portion to a closed position close to the grip portion. A main lever, a sub-lever held at an arbitrary position from a minimum set position to a maximum set position, and a folding member rotatably held on a lever piece shaft provided integrally with the sub-lever, A cable for pulling the driven member is operatively connected to the main lever in a state where the cable is hung around the folding member, and by moving the main lever from the open position to the closed position. Pulling the cable through the folding member and moving the sub-lever from the minimum set position to the maximum set position More is said folding member to move in a direction of pulling the cable.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

[0015] In a preferred aspect of the hand lever device of the present invention, the main lever is an operation part operated by a finger so as to approach the grip part, and a swing supported by a support shaft.
Base, and has become the swing lever protruding upward from the rotational base portion, together with the pressing portion該揺Do lever portion is pushed, is the cable to the distal end portion of the swing lever portion Be linked.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

When the sub-lever is turned to the minimum set position, the main lever is automatically turned to the closed position close to the grip. In this case, since the sub-lever is held at an arbitrary rotation operation position, the main lever is in the closed position unless the sub-lever is rotated toward the maximum set position side. It is held immovable. In this state, the cable ( throttle cable ) connected to the driven member ( carburetor throttle valve ) is pulled by the main lever for a predetermined length, the play is eliminated, and the driven member (carburetor throttle valve) is removed. ) Is maintained at the minimum set position (idle rotation opening).

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

The main lever 30, which is swingably held by the case member 20, is made of synthetic resin.
As can be clearly understood from FIG. 8, the linear operation part 31 and the support shaft 35, which are rotated by fingers so as to approach the lever receiving part 11 a provided at the lower end of the rear grip part 11, are loosely attached to the support shaft 35. The swing base 32 externally fitted, and the swing base 3
2 comprises a swinging lever portion 33 extending obliquely upward and curved in accordance with the outer peripheral shape of the bar handle 7. The right end of the support shaft 35 is located below the rear end of the right cover case 21. The left end portion is press-fitted into an insertion hole 22d formed in the intermediate cover case 22, and the left end portion is inserted into an insertion hole 23d formed in the left cover case 23, near the side corner. It is loosely passed.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

On the side of the storage portion 64 where the cylindrical shaft portion 63 is provided, the main lever 30 is pivoted forward from the open position D to the closed position U. A cam portion 70 as a pushing portion for pushing to protrude is provided. The sub-lever 51 includes a serration shaft portion 62 provided on the lever piece shaft 60 and a serration portion 52 fitted on the outside of the right cover case 21. A screw 55 is provided on the right end of the lever piece shaft 60. (See FIG. 6). The serrated shaft portion 6 on the right end side of the lever piece shaft 60
2 is supported by a bearing portion 21 e provided on the right side of the right cover case 21, and the cylindrical shaft portion 63 on the left end side is supported by the bearing portion 2 provided on the intermediate cover case 22.
The pulley 45 is rotatably supported by a pin 46 in the storage portion 64. Here, the center axis O 'of the pin 46 for supporting the pulley 45 is deviated upward by a predetermined distance E with respect to the rotation axis O of the sub-lever 51 (the center axis of the lever piece shaft 60). The sub-lever 5
By tilting 1 toward the rear side, the pulley 45 is moved in the direction of pulling the throttle cable 17 (rearward).

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 2 Internal combustion engine 7 Bar handle 10 Hand lever device 11 Rear grip part 17, 18 Throttle cable 30 Main lever 31 Operating part 32 Swing base 33 Swing lever 35 Support shaft 45 Pulley (return member) 51 Sub-lever 60 Lever piece shaft 70 Cam (pressing part) CV Driven member (carburetor throttle valve) D Open position H Maximum set position L Minimum set position U Closed position 80 Biasing means (torsion coil spring)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B083 AA02 BA02 CA27 DA02 HA23 HA29 HA52 2B382 GA02 GA07 GB05 GC05 GC12 JA02 JA12 JA21 3G065 BA04 CA22 JA02 JA06 JA12 KA05 3J070 AA03 BA41 CC12 CC23 CC34 DA03

Claims (5)

[Claims] 1. A main lever (30) moved from an open position (D) away from the grip portion (11) to a closed position (U) close to the grip portion (11), and a minimum set position (L). ) To the maximum set position (H), and a sub-lever (51) held at an arbitrary position, and a lever piece shaft (60) provided integrally with the sub-lever (51) to be rotatably held. Folding member (45)
And a cable (18) for pulling the driven member (CV) is operatively connected to the main lever (30) in a state where the cable (18) is wound around the folding member (45). By moving (30) from the open position (D) to the closed position (U), the cable (18) is pulled through the folding member (45), and the sub-lever (51) is set to the minimum set position. A hand lever device (10) adapted to move the folding member (45) in a direction in which the cable (18) is pulled by moving from a position (L) to the maximum set position (H). When the sub-lever (51) is moved from the maximum set position (H) to the minimum set position (L) on the piece shaft (60), A hand lever device provided with a pushing portion (70) for pushing the main lever (30) from the open position (D) side to the closed position (U). The main lever (30) includes an operating part (31) operated by a finger so as to approach the grip part (11), and a rotating base (3) pivotally supported by a support shaft (35).
2) and a swing lever portion (33) projecting upward from the rotation base end (32), and the pushing portion (70) pushes the swing lever portion (33). Along with
The cable (1) is attached to the tip of the rotating lever (33).
The hand lever device according to claim 1, wherein 8) is connected. 3. The hand lever device according to claim 1, wherein the pressing portion is a cam (70). 4. An apparatus according to claim 1, further comprising an urging means for urging the main lever in the direction of the open position. 3. The hand lever device according to claim 1. 5. The hand lever device according to claim 1, wherein the driven member is a carburetor throttle valve (CV) of an internal combustion engine (2).