JPH0953475A - Hand lever device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a hand lever device having both functions of ensuring high safety and obtaining good operability. SOLUTION: A hand lever device is so constructed that one end of an inner cable 22 inserted in an outer tube 21 of a Bowden cable 20 to operate a driven member is connected to a main lever 30 operated to rotate, and includes feed means 40 such as screw feed mechanisms 41, 45,... for forcedly moving one end part 21a of the outer tube 21 along the longitudinal direction of the inner cable 22.

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 throttle valve of an internal combustion engine via a cable, and more particularly to a handle grip in a working machine such as a hedge trimmer or a brush cutter. The present invention relates to a hand lever device which is arranged in the vicinity of a portion and is suitable for opening and closing the throttle valve through a throttle cable.

[0002]

2. Description of the Related Art For example, in a working machine such as a hedge trimmer or a brush cutter which is designed to drive a working part such as a cutting blade by an internal combustion engine, the output of the internal combustion engine is adjusted at hand, and therefore it is equipped with it. A hand lever device for adjusting the opening degree of the throttle valve of the internal combustion engine is arranged near a grip portion such as a U-shaped handle or bar handle.

This hand lever device is usually provided with a throttle trigger (throttle lever) which is operated by the operator's finger, and when this throttle lever is rotationally operated, the throttle valve of the throttle valve is operated via a throttle cable. It is designed to adjust the opening. 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 that can always hold the throttle lever at a desired rotational operation position even when the finger is released. Is known (see Japanese Utility Model Publication No. 57-19944).

[0005]

In the automatic return type, the engine automatically returns to the idling state when the finger is released from the throttle lever, and the engine output is transferred to the working unit including the cutting blade via the centrifugal clutch. If it is a working machine that transmits power, the centrifugal clutch will be in the disengaged state and power transmission to the working section will be cut off, so in the event of an unexpected situation, immediately open the throttle valve at the idle rotation opening degree. The advantage is that the working part can be stopped by returning to the work position and the safety can be improved, but the throttle lever must always be held with fingers to maintain the desired turning operation position, so the intermediate opening Is difficult to use, fingers are tired, and the operation amount (number of rotations) is not constant.

Generally, in consideration of usability, a rotary operation lever such as a throttle lever, which is operated by fingers, does not require an intermediate opening degree, and a release position and a set position (grip position).
It is desirable to make it take only two positions,
Regardless of whether the throttle valve is in the middle opening (partial opening) or in the full opening (WOT), it is considered that the operability is better if the turning operation position (set position) is the same. .

On the other hand, the fixed type can solve the problem of the automatic idle rotation opening return type, and it is possible to always keep the throttle lever in an immovable state even if the throttle lever is manually released to a desired turning operation position. However, it is possible to obtain the advantage that the fingers can be freed and the work can be done easily, but in the event of an unexpected situation, another operation to release the position holding function of the throttle lever is required, and the work unit immediately Since it cannot be stopped, there is a problem in that it is inferior to the automatic idle rotation opening return type in terms of safety.

The present invention has been made in view of the above problems, and an object thereof is to eliminate the disadvantages of the automatic idle rotation opening return type and the fixed type, and combine the advantages. A hand lever device, specifically, for example, the opening of a throttle valve as a driven member can be adjusted via a cable, can be held at a desired opening, and can be immediately returned to the minimum opening. It is an object of the present invention to provide a hand lever device capable of ensuring high safety, preventing fingers from getting tired, and achieving good operability.

[0009]

In order to achieve the above object, the hand lever device according to the present invention is basically such that a main lever which is operated to be rotated is inserted into an outer tube of a Bowden cable. One end of an inner cable for operating a driven member is connected, and a feeding means for forcibly moving one end of the outer tube along the longitudinal direction of the inner cable is provided. .

In a preferred aspect of the present invention, the feeding means is a screw including a male screw portion externally fitted and fixed to one end of the outer tube and an adjusting dial screwed onto the outer periphery of the male screw portion. A feed mechanism, or an adjusting lever that is turned, a turning link integrally connected and fixed to the adjusting lever, and an interposing between the turning link and one end of the outer tube. Examples include a lever mechanism composed of a mounted traction coupler.

Further, as the driven member, a throttle valve of an internal combustion engine can be cited as a typical example.
In this case, the throttle valve is constantly urged in the idle rotation opening direction, and when the throttle cable connected to the throttle valve is pulled for a predetermined length or more from the non-operating state, the play is eliminated and the throttle valve is opened. It will start to open. Further, in the hand lever device according to the present invention arranged near the grip of the handle of the working machine configured to drive the working part such as the cutting blade by the internal combustion engine provided with the throttle valve, A throttle cable is inserted into the outer tube of the Bowden cable, and one end of the throttle cable is connected to a main lever that is rotatably operated, and one end of the outer tube is forced to extend along the longitudinal direction of the inner cable. It is provided with a feeding means for moving the sheet.

In a preferred mode of the hand lever device according to the present invention having such a configuration, when the main lever is in the released state, the throttle valve is at the minimum opening (idle rotation opening), When the main lever is rotated from the state to the set position close to the grip, the throttle lever, which is an inner cable of the Bowden cable, is pulled by the main lever for a predetermined length to eliminate the play.

On the other hand, when the adjusting dial, which constitutes the feeding means, is screwed onto the outer periphery of the male screw portion externally fitted and fixed to one end portion (main lever side) of the outer tube, for example, is rotated clockwise. The position of one end portion of the outer tube together with the male screw portion is moved along the direction in which the throttle cable is pulled, so that the outer tube that is normally bent and routed is slightly deformed and moved. And with it,
The position of one end (main lever side) of the throttle (inner) cable inserted through the outer tube does not change, but the other end (throttle valve side) pulls in a direction to increase the opening of the throttle valve. (For the movement of the inner cable due to such deformation movement of the outer tube, see, for example, Japanese Patent Publication No. 3-35856).

Therefore, when the position of one end of the outer tube is adjusted to an appropriate position by operating the adjustment dial in advance and the main lever is rotated to the set position close to the grip, The throttle valve is opened to an opening degree corresponding to the moving position of the one end of the outer tube. In other words, the opening of the throttle valve is adjusted by the adjustment dial.

Further, when it is desired to greatly reduce the rotational driving force of the engine immediately after an unexpected situation occurs, for example,
Completely release the main lever. As a result, the throttle cable is urged in the throttle valve closing direction, so that the main lever is pulled by the throttle cable to return to its original state, and the throttle cable is returned to the non-operation state, so that the throttle valve is closed. Is automatically returned to the original idle rotation opening position, and the internal combustion engine is idling. Here, in the case of a working machine in which the engine rotational driving force is transmitted to a working unit such as a cutting blade via a centrifugal clutch, the centrifugal clutch is in a disengaged state and power transmission to the working unit is cut off. As it leans, the working parts such as the cutting blade are immediately stopped.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a brush cutter adopting an embodiment of a hand lever device according to the present invention. The brush cutter 1 of the illustrated example includes a U-shaped handle 7 in which grip portions 11 and 12 are juxtaposed with each other at a predetermined interval on the left and right,
A working portion 3 including a cutting blade 13 and a safety cover 14 is provided on the tip side of the operating rod 8 that supports the U-shaped handle 7.
On the rear end side, as a power source for driving the cutting blade 13 via a drive shaft 9 inserted in the operating rod 8,
An internal combustion engine (small air-cooled two-cycle gasoline engine) 2 provided with a recoil starter 6 and a fuel tank 4 is provided, and the internal combustion engine 2 is provided with a carburetor (not shown) having a throttle valve CV and an ignition plug 5. Has been.

In the present embodiment, the throttle valve CV is always urged in the minimum (idle rotation) opening direction, and a throttle (inner) cable 22 connected to the throttle valve CV, which will be described later, is at least a predetermined length from the non-operated state. When pulled, the play is eliminated and the opening of the idle rotation opening is started. Then, the pair of grips 1
A hand lever device 10 of the present embodiment is provided on a grip 11 of 1 and 12 that is normally held by the right hand (on the right side in FIG. 1) to adjust the opening of the throttle valve CV.

As shown in FIG. 2, the hand lever device 10 includes a fastening fixture 25, 26, 26
The right and left vertical split type cases 15A and 15B fastened together at 27, 28 and 31 are provided on the overhanging portion 11a provided on the upper portion of the grip 11, and the base portion 30a is also used as the fastening fixture. It has a main lever 30 having a substantially "V" shape, which is composed of a grip operating portion 30A pivotally supported by a bolt shaft 31 and a pulling portion 30B. The main lever 30 allows the outer tube 21 of the Bowden cable 20 to The throttle cable 22, which is an inserted inner cable, is pulled.

That is, the end of the pulling portion 30B of the main lever 30 is provided with a locking portion 34 for locking the end fitting 24 fixed to the one end 22a of the throttle (inner) cable 22. The main lever 30
By rotating the grip operating portion 30A, the throttle cable 22 is pulled by the pulling portion 30B for a predetermined length to eliminate the play.

An end fitting 23 such as a parallel chamfer is attached to the one end 21a of the outer tube 21 of the Bowden cable 20 on the grip 11 side so as to prevent whirling, and the end fitting 23 is fixed to the end fitting 21a. A cylindrical male screw portion 41 having a predetermined length is integrally provided on the tip side, and an anti-slip groove 45a is formed on the outer periphery of the male screw portion 41.
An adjustment dial 45 having a groove is screwed on. The adjustment dial 45 has an opening 4 formed in a part of the outer peripheral portion thereof at a position slightly lower than the projecting portion 11a of the side peripheral portion of the grip 11 on the side opposite to the main lever 30.
The holding portions 42 and 4 which are exposed to the outside from 7 and project inside the grip 11 (inside the cases 15A and 15B).
It is held rotatably by 2, and in a state in which the male screw portion 41 is prevented from moving (vertical movement) in the pitch direction.

Accordingly, the screw feed mechanism 40 is constituted by the male screw portion 41 provided on the one end portion 21a side of the outer tube 21, the adjusting dial 45 screwed onto the outer periphery of the male screw portion 41, and the like. By rotating the adjustment dial 45, the male screw portion 41
At the same time, the position of the one end 21a of the outer tube 21 is moved. In this case, the one end portion 21a of the outer tube 21 is released even if the fingers are removed from the adjustment dial 45.
Does not move and retains its position.

In the hand lever device 10 of the present embodiment having such a structure, when the main lever 30 is in the released state as shown by the solid line in FIG. 2, the throttle valve CV has the minimum opening ( 2 and the main lever 30 from this state.
When it is fully rotated to the set position close to the grip 11 as shown by the phantom line, the main lever 30 pulls the throttle cable 22 for a predetermined length to eliminate the play.

On the other hand, when the adjusting dial 45 screwed onto the outer circumference of the male screw portion 41 on the one end 21a side of the outer tube 21 which constitutes the feeding means is rotated clockwise, for example, the male screw portion 41 and The position of the one end portion 21a of the outer tube 21 is moved in the direction in which the throttle cable 22 is pulled (upward in FIG. 2), and as a result, it is normally bent with an appropriate allowance as shown in FIG. The outer tube 21 of the Bowden cable 20 that is pulled around is slightly deformed and moved, and accordingly, one end portion (on the side of the main lever 30) of the throttle cable 22 that is inserted into the outer tube 21 is The position does not change, but the other end (on the side of the throttle valve CV) is the opening of the throttle valve CV. Pulled in the direction of increasing is moved to. On the contrary, when the adjusting dial 45 is rotated counterclockwise, the position of the one end portion 21a of the outer tube 21 together with the male screw portion 41 is moved downward in FIG. Are moved in a direction to decrease the opening degree of the throttle valve CV.

Therefore, the adjustment dial 45 is previously set.
Is operated to adjust the position of the one end 21a of the outer tube 21 to an appropriate position, and the main lever 30
When the hand is fully rotated to the set position close to the grip 11, the play of the throttle cable 21 is eliminated and the throttle valve CV is opened according to the moving position of the one end 21a of the outer tube 21. Open to. In other words, the opening of the throttle valve is adjusted by the adjustment dial 45.

When it is desired to greatly reduce the rotational driving force of the engine 2 immediately after an unexpected situation occurs, the main lever 30 is completely released. As a result, the throttle cable 22 is constantly connected to the throttle valve C.
Since it is biased in the V closing direction, the main lever 30
Is pulled back by the throttle cable 22 and returned to the original state, the throttle cable 22 is returned to the non-operating state, the throttle valve CV is returned to the original idle rotation opening position, and the internal combustion engine 2 automatically It will be idling. Here, in the case of the working machine 1 in which the engine rotational driving force is transmitted to the working unit 3 including the cutting blade 13 via the centrifugal clutch, the centrifugal clutch is in the disengaged state and the working unit 3 Since the power transmission is cut off, the working portion 3 such as the cutting blade 13 is immediately stopped.

FIG. 3 shows another embodiment of the hand lever device according to the present invention. In this example, the main lever 30
The one end 22a of the throttle cable (inner cable) 22 is connected to the same as in the above-described embodiment (details omitted), but a feeding means for forcibly moving the one end 21a of the outer tube 21. As shown in detail in FIG. 4 and FIG.
The adjusting lever 70 that is disposed outside the A and 15B and is rotatably operated, and the adjusting lever 70 integrally with the case 1
Rotation link 67 connected and fixed in 5A and 15B
The present embodiment is different from the above-described embodiment in that the lever mechanism 60 including the pulling link 62 interposed between the rotation link 67 and the one end 21a of the outer tube 21 is used.

That is, the adjusting lever 70 is provided with an operation convex portion 70b at its tip and a fitting concave portion 72 having an oval cross section on a bottomed cylindrical base portion 70a.
The rotation link 67 has a large-diameter base shaft portion 67a, and an arm portion 67 protruding from the base shaft portion 67a in the radial direction.
b, small-diameter support shaft portions 67c and 67e projecting from the left and right ends of the base shaft portion 67a, and the left support shaft portion 67c.
And a parallel-chamfered rotation-stop fixing portion 67d connected to each other, and a female screw portion 69 is formed on the rotation-stop fixing portion 67d and the left side support shaft portion 67c so as to pass through the central axis thereof.

The fitting recess 72 of the adjusting lever 70 is provided on the left end side of the rotating link 67 and is provided in the case 15
The rotation stopper fixing portion 67d protruding outward from A is fitted into the rotation stopper 67 and the adjusting lever 70.
Is connected and fixed so as to rotate integrally with each other by a screw 75 screwed into the female screw portion 69 via a washer 74. The rotating link 67 is connected to the supporting shaft portions 67c, 67e. A part is rotatably supported by the cases 15A and 15B.

A disc spring 80 is interposed between the adjusting lever 70 and the left case 15A, and the resilience of the disc spring 80 is used to adjust the screwing amount of the screw 75. By adjusting, the frictional force between the case 15A, (the left end surface of the base shaft portion 67a of) the rotation link 67, and the adjustment lever 70 is adjusted, whereby the adjustment lever 70 is not held by fingers. However, it is held immovably at any rotation position.

On the other hand, the traction connecting member 62 interposed between the rotating link 67 and the one end portion 21a of the outer tube 21 is composed of a horizontal bottom plate portion 62a and side plate portions 62b and 62b rising from both ends thereof. The tubular male screw portion 61 connected and fixed to the one end portion 21a of the outer tube 21 via the end fitting 23 is inserted into the bottom plate portion 62a, and the bottom plate portion 62a is inserted into the bottom plate portion 62a. The outer tube 21 and the pulling connection tool 62 are connected and fixed by a pair of lock nuts 63 and 63 screwed to the male screw portion 61 so as to sandwich the portion 62a, and the side plate portions 62b and 62b are connected to the case. 15A, 1
It is slidable vertically by being guided by the guide wall portions 15C, 15C of 5B.

The turning link 67 and the pulling connection tool 62 are provided with an elongated hole 68 formed in an arm portion 67b of the turning link 67 and a side plate portion 62 of the pulling connection tool 62.
B and 62b are rotatably connected to each other by a shaft pin 65 with a C-shaped stopper 66 that is inserted through insertion holes 64 and 64 formed at the upper ends of the b and 62b. Here, the adjusting lever 70
When, for example, is rotated clockwise, the one end portion 21a of the outer tube 21 is moved upward together with the male screw portion 61 via the rotation link 67 and the pulling connection tool 62. In this case, even if you release your finger from the adjustment lever 70,
(The base shaft portion 67 of the case 15A and the rotation link 67
Due to the frictional force between the left end surface of a) and the adjusting lever 70, the adjusting lever 70, the rotation link 67, the pulling connection tool 62, and the one end portion 21a of the outer tube 21 do not move, and their positions are maintained.

Therefore, the position of the one end portion 21 of the outer tube 21 is adjusted to an appropriate position by operating the adjusting lever 70 in advance, and the main lever 30 is set with the fingers to approach the grip 11. When it is fully rotated, the play of the throttle cable 21 is eliminated and the throttle valve CV is opened to an opening degree corresponding to the moving position of the one end portion 21a of the outer tube 21, similar to the above-described embodiment. Then, the opening of the throttle valve CV is adjusted.

When it is desired to greatly reduce the rotational driving force of the engine 2 due to an unexpected situation or the like, the main lever 30 is completely released. As a result, the throttle cable 22 is returned to the non-operated state, and the throttle valve CV is automatically returned to the original idle rotation opening position, and substantially the same operational effect as the above-described embodiment is obtained.

Although the two embodiments of the present invention have been described in detail, the present invention is not limited to the above-mentioned embodiments, and does not depart from the spirit of the invention described in the claims. Therefore, various changes can be made in the design. For example, instead of the screw feed mechanism 40 or the lever mechanism 60, the one end 21a of the outer tube 21 may be slid on a straight line to pull the one end 21a of the outer tube 21 instead of the screw feeding mechanism 40 or the lever mechanism 60. It is also possible to use a sliding knob mechanism including a sliding knob and a friction holding means for holding the sliding knob at an arbitrary sliding position.

In the illustrated example, the hand lever device 10 according to the present invention is used to adjust the opening degree of the throttle valve CV of the internal combustion engine 2. However, the hand lever device according to the present invention is used for the throttle valve CV. It goes without saying that it can also be used for purposes other than adjusting the opening degree. Further, the hand lever device 10 can be used by directly attaching it to the bar handle as well as the U-shaped handle 7.

[0036]

As can be understood from the above description, according to the hand lever device of the present invention, for example, the opening of the throttle valve as the driven member can be appropriately adjusted via the cable and the desired opening can be achieved. It is possible to maintain the degree of time, and it is possible to immediately return to the idle rotation opening degree so as to ensure high safety, to prevent fingers from getting tired, and to obtain good operability.

[Brief description of 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 partially cutaway left side view showing an embodiment of a hand lever device according to the present invention.

FIG. 3 is a partially cutaway left side view showing another embodiment of the hand lever device according to the present invention.

FIG. 4 is an exploded perspective view of a main part of the embodiment of FIG.

FIG. 5 is a sectional view taken along the line VV of FIG. 3;

[Explanation of Codes] 2 ... Internal Combustion Engine 10 ... Hand Lever Device 20 ... Bowden Cable 21 ... Outer Tube 21a ... One End 22 ... Throttle (Inner) Cable 22a ... One End 30 ... Main Lever 40 ... Screw Feed Mechanism 41 ... Male Thread Part 45 ... Adjusting dial 60 ... Lever feeding mechanism 62 ... Traction connecting tool 67 ... Rotating link 70 ... Rotating lever (adjusting lever) CV ... Throttle valve (driven member)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area G05G 1/04 G05G 1/04 A

Claims (4)

[Claims] 1. A hand lever device 10 in which an end portion 22a of an inner cable 22 that is inserted into an outer tube 21 of a Bowden cable 20 to operate a driven member CV is connected to a main lever 30 that is rotated. 2. The hand lever device according to claim 1, wherein the outer tube 21 is provided with feeding means 40, 60 for forcibly moving the one end 21 a of the tube 21 along the longitudinal direction of the inner cable 22. 2. The screw configured by the feeding means, which comprises a cylindrical male screw portion 41 connected to one end portion 21a of the outer tube 21 and an adjusting dial 45 screwed onto the outer periphery of the male screw portion 41. The hand lever device according to claim 1, comprising a feeding mechanism 40. 3. An adjusting lever 70 for rotating the feeding means, a rotating link 67 integrally connected and fixed to the adjusting lever 70, and one end portion of the rotating link 67 and the outer tube 21. The hand lever device according to claim 1, wherein the hand lever device includes a lever mechanism 60 including a traction connection tool 62 interposed between the hand lever device 21a and the pulling connection tool 21a. 4. The hand lever device according to claim 1, wherein the driven member is a throttle valve CV of the internal combustion engine 2.