JP3489808B2 - Operation lever device for work equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating lever device for controlling a prime mover in a working machine of a type in which a working implement is driven by a prime mover such as a brush cutter, a chemical sprayer, and a dust collector. .

[0002]

2. Description of the Related Art A working machine of a type in which a driving machine is carried on a back and a work implement is driven by the driving machine, for example, a brush cutter, is conventionally known from Japanese Utility Model Publication No. 63-14035. This type of mowing machine is one in which a handle provided on an operating rod equipped with a cutting blade that is rotated and driven by a prime mover is gripped by hand, and the operating rod is moved left and right and up and down to perform mowing work. Is. The operating handle is provided with an operating section for controlling the prime mover, and the output of the prime mover is controlled by controlling a throttle lever provided on the operating section, thereby controlling the rotation speed of the cutting blade. By the way, it is generally configured to operate the throttle lever together while holding the operation handle with the hand, and work with the throttle lever held by the hand, and the weeding machine is used for cutting off the weeds. Since the worker needs to continue to hold the throttle lever with his finger during the work, the burden on the worker is large.

For this reason, in order to reduce the burden of continuing to grip the throttle lever during work, a locking mechanism that locks the throttle lever in a predetermined position and keeps this state, and a releasing mechanism thereof are provided. An attempt is made to attach it to the handle or the operation part. As an operation lever device in which a throttle lever and a lock lever are arranged in parallel, Japanese Utility Model Publication No. 55-21536, Japanese Utility Model Publication No. 60-41539, and Japanese Utility Model Publication No. 53-42661 are available.
The techniques of Japanese Patent Laid-Open No. 8-303263 are disclosed.

[0004]

In any of the above-mentioned prior arts, the throttle lever is set at a predetermined position, and in this state, the throttle lever is locked to hold it at that position via a lock mechanism. It is configured to unlock. In the above technique, the throttle lever and the release lever are separately provided in the handle grip portion, so that the levers are arranged close to each other, but the operability is poor, the structure is complicated, and the number of parts is also large. Will increase. Although the throttle lever and the lock lever are coaxially arranged, the strong elastic force of the spring directly acts on the pivotal support of each lever to rotate each lever.
A large force is required, the operability is poor, and if the spring is weakened, the throttle lever regulation force of the lock lever is reduced. Since the throttle lever and the lock lever are separately arranged and the rolling pawl which connects each lever between them is provided, the technology of (3) has a complicated structure and a large number of parts.
In the technology of (1), the throttle lever and the lock lever are coaxially provided, but since the rotation of the lock lever is restricted only by the spring, there is a problem similar to the above technology.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention comprises a throttle lever and a lock lever,
It is an object of the present invention to provide an operating lever device for a working machine that can simplify the structure of the lock mechanism of the throttle lever and reduce the number of parts. Another object of the present invention is to
The locking operation of the throttle lever at the operation position in the motor control operation is reliable, the lock lever can be easily locked, and the throttle lever and the lock lever can be arranged close to each other. It is an object of the present invention to provide an operating lever device for a working machine, which is capable of achieving a more compact outer shape and improved operability.

[0006]

In order to solve the above-mentioned problems, the first aspect of the present invention is to provide a working machine equipped with a working tool driven by a prime mover and an operating handle having an operating portion for controlling the prime mover. The operation unit provided includes a throttle lever and a lock lever that regulates the operation position of the throttle lever via a pressing mechanism, and the pressing mechanism is integrated with the main body of the operation handle coaxially with the support shaft of the lock lever. A first cam formed on the first cam, a second cam provided on a lock lever engaged with the first cam, and a pressure urging means arranged on the opposite side of the second cam. And the second cam is configured so that the second cam is
Characterized by pressing the throttle lever
It

According to the first aspect of the present invention, it is possible to reliably lock the throttle lever at the operation position with the lock lever by the pressing mechanism, which constitutes the pressing mechanism.
Since one of the individual cams is formed integrally with the operation handle body, the structure of the pressing mechanism can be simplified and the number of parts can be reduced.

According to a second aspect of the present invention, in the first aspect, the tubular portion is provided on one of the outer periphery of the first cam integrally provided on the main body of the operating portion or the outer periphery of the second cam provided on the lock lever, and the other is provided. The cam was fitted in the tubular portion. In claim 2, the first
Since the cam and the second cam have an internal and external fitting relationship,
It is possible to prevent dust and the like from entering between both cams, which is excellent in dustproofness, and it is possible to ensure a reliable and smooth operation of the cams. In particular, with a brush cutter, chemical sprayer, dust collector, etc. that work outdoors with a large amount of dust, there is a risk that dust will enter the operating section, ensuring a high degree of dust resistance and ensuring the operation of the throttle lever lock mechanism. It is preferable for smoothness.

According to a third aspect of the present invention, in the first aspect, the pressing biasing means is configured to engage the first and second cams with each other and press a part of the throttle lever. In claim 3,
When the throttle lever is operated, in addition to the pulling force of the throttle lever control cable, an appropriate frictional force is obtained by the pressing biasing means of the pressing mechanism.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals. FIG. 1 is an explanatory view showing an example of work by the working machine 1, and in the embodiment, weeding work of weeds by a backpack-type mower is shown. The working machine 1 includes a prime mover 3 such as a gasoline engine mounted on a frame 2, a flexible tube 4 connected to an output portion of the prime mover 3, a flexible transmission shaft (not shown) passing through the flexible tube 4, and a long body composed of a rigid body. Of the operating rod 5, a cutting blade 6 provided at the tip of the operating rod 5, and the cutting blade 6 is rotated by the output of the prime mover 3 via a transmission shaft passing through the operating rod 5.
To drive.

A grip handle 7 and an operation handle 10 are provided on the rear half of the operation rod 5, and the respective handles 7, 1 are provided.
0 is provided so as to stand above the operating rod 5. The worker M carries the frame 2 carrying the prime mover 3 via the backrest pad 9 via the backrest belt 8, exposes the operating rod 5 to the right side of the body, and holds the grip handle with the left and right hands, for example, the left hand LH. The operation handle 10 is gripped like a gun grip with the right hand RH, and the operation rod 5 is swung up and down, left and right, and the weeding work is performed. The left hand LH mainly grips the grip handle 7, and bears the up / down and left / right operation functions of the operating rod 5. On the other hand, the right handle RH grips the manipulation handle 10, and the right hand RH grips the manipulation handle 10. The throttle is adjusted to control the output of the prime mover 3.

FIG. 2 is a perspective view showing the appearance of the operation handle 10. Arrow F in the figure is the front and RR is the rear. The operation handle 10 has a gun-grip-shaped outer shape, and is provided with a grip-shaped grip portion 11 to be gripped by a hand, and a main body 12 of the operation handle constituting the operation portion. The main body 12 has a split middle structure including a joined body of left and right members 13 and 14. A throttle lever 30 is arranged on the front surface of the main body 12 so as to project forward and tilt downward, and a lock lever 40 is arranged on the rear surface so as to project backward and tilt downward. . Further, the start switch 80 of the prime mover 3 is arranged on the rear upper half of the main body 12 in a rearwardly inclined portion. Further, on the left side surface of the main body 12, the throttle lever is locked and the adjustment operation is performed to perform the secondary adjustment. The lever 60 was placed.

FIG. 3 shows the operation section body 1 of the operation handle 10.
FIG. 2 is an exploded perspective view of the component 2, showing the individual components in an exploded manner. The left and right members 13, 14 that form the main body 12 are
Peripheral piece portions 13b and 14b symmetrically projecting inward are integrally provided at respective peripheral edge portions of the base plate portions 13a and 14a.
Notches 13c, 13d, 14d, 13e, and 14e are provided in the lower half portion, the upper half portion, and the rear lower portion of the front portions 3b and 14b.
Symmetrically (the cutout corresponding to the cutout 13b of the member 13 of the member 14 is not shown hidden in FIG. 2). These cutouts form an opening through which the throttle lever 30, the lock lever 40, and the starting switch 80 are led out of the main body 12 in a state where the members 13 and 14 are assembled and integrated.

On the inner side surface of each of the left and right members 13 and 14, cylindrical shaft parts 15 and 16 are coaxially and projectingly provided in the front part so as to be symmetrically opposed to each other, and 15 is a cylindrical hole shape. On the other hand, the end portion 16 is closed by the substrate portion of the member 14, and the inner peripheral portion is a screw hole. In addition, at the rear part of the same inner surface, a cylindrical shaft part 1 with chamfered upper and lower surfaces
7 and 18 are provided so as to be symmetrically opposed to each other. At the upper part of the inner side surface of the member 13 on the right side of FIG. 2, a shaft portion 19 provided with a screw hole is provided so as to project. At the lower ends of the left and right members 13 and 14,
Symmetrically semicircular holding portions 13f and 14f (14f is shown in FIG.
Then it does not appear hidden. (See FIG. 7). When the left and right members 13 and 14 are assembled and integrated, the holding portion 13
Fit the upper end of the pipe 20 made of metal or the like to f and 14f,
Attach the main body 12 to the upper end portion of the pipe 20 by screwing and support the main body 12 around the pipe 20, and hold the above-mentioned gripping portion 11 around the pipe 20.
Attach.

A through hole 21 is provided in the upper middle portion of the front half of the base plate portion 14a of the left member 14 so as to be loosely engaged with the head portion of a support shaft 61 which will be described later. An annular flange portion 21 a protruding outward is provided on the outer peripheral portion of the through hole 21. Also, the substrate portion 14a
An arc-shaped guide elongated hole 22 centered on the cylindrical shaft portion 16 is provided on the outer side of the through hole 21. A first cam 23, which is coaxial with the left through hole 21, is provided on the inner surface of the base plate portion 13a of the right member 13, and the first cam 23 is integrated with the main body, and thus one side that constitutes the main body. Member 13 which is a member of
It is formed on the inner surface of the base plate portion 13a so as to integrally project therewith so as to protrude in the inner side surface direction. The specific cam shape will be described later. At the center of the cam 23, a support shaft hole 23a coaxial with the through hole 21 is provided so as to penetrate in the width direction.

Between the left and right members 13 and 14 described above, the throttle lever 30, the lock lever 40, and the parts constituting the pressing mechanism are interposed. The throttle lever 30 includes a lever portion 31, a cylinder shaft portion 32 provided at an upper end portion thereof, and a cylinder shaft portion 3.
A fan-shaped piece 33 having 2 as a fulcrum, and an arc-shaped guide elongated hole 34 provided in the fan-shaped piece 33 and having the cylindrical shaft portion 32 as a center are provided. The throttle lever 30 is provided on one side surface of the fan-shaped piece 33, at an end portion on the half body side of the cylindrical shaft portion 32, and on the left side member 14.
The knob 35 was projected in the direction of and the top and bottom of the knob 35 were chamfered. On the surface of the throttle lever 30 on the side opposite to the knob 35 of the fan-shaped piece 33, the throttle lever 30 and
A holding portion 36 that rotatably holds a piece 38 of a control cable 37 that connects the operation shaft of the throttle valve of the prime mover 3 is provided in a protruding manner (see FIG. 6 for the structure of this portion).

The lock lever 40 is provided with a long lever portion 41, an upper portion of the lever portion 41, and a base piece portion 42 and a base piece portion 4 which are bent in a direction perpendicular to the lever portion 41.
The hook portion 43 is provided at the lower end portion of the second lever portion 41 side. The inner tubular portion 45 and the outer tubular portion 4 are provided at the tip of the base piece portion 42.
The tubular portion 44 integrally including the inner and outer double tubular portions 6 is integrally provided. The inner cylinder portion 45 of the cylinder portion 44 is provided over a length of about ½ in the axial direction, and a second cam 45 described later with reference to FIG. 4 is provided on the inner end surface of the cylinder portion that does not include the inner cylinder portion 45. Equipped with. When the throttle lever 30 and the lock lever 40 are pivotally supported, the space between the cylinder portion 44 of the lock lever 40 and the fan-shaped piece 33 of the throttle lever 30 and between the fan-shaped piece 33 and the member 14 of the member 14 side of the board 14a. In between, a pair of disc springs 52, 52, which are the pressing biasing means of the pressing mechanism, three washers 53,
53, a pair of disc-shaped rubber plates 54, 54 are interposed.

In FIG. 3, reference numeral 60 designates a curved ball-shaped secondary adjusting lever 60, 61 designates a support shaft constituted by bolts, 6
2 is a nut, 63 and 63 are long-necked screws, 64 is a connecting screw for the pipe 20, 65 is a nut, and 66 is a 2
The fixing screw of the next adjusting lever 60, 67 is a return spring of the throttle lever 30 composed of a torsion spring, 68 is a return spring of the lock lever 40 composed of a coil spring, 69
Indicates a screw that supports one end of the return spring 68.

FIG. 4 is an explanatory enlarged perspective view of a cam portion for explaining the first cam integrally provided on the right member 13 of the main body 12 and the second cam provided on the lock lever 40. First
The cam 23 is integrally formed with the member 13,
Is formed in a cylindrical shape and has a support hole 23a penetrating through the center thereof. The outer peripheral portion 23b is a perfect circle,
A plurality of valleys 24a radially provided on the projecting end face in the axial direction.
(Representing a plurality, the same applies hereinafter), and a cam portion 24 including a plurality of mountain portions 24b. Each valley 24a ... and each mountain 2
4b ... Are continuous by slopes 24c provided in the rotational direction, and the opposite side is continuous by a right-angled wall.

Inner cylinder 4 of cylinder 44 of lock lever 40
5, the outer cylinder portion 46 is formed coaxially, and the inner cylinder portion 45
Is provided to have a length of about ½ of the axial length of the outer tubular portion 46. The inner diameter of the extension cylinder portion 46a of the outer cylinder portion 46 in the axial direction on the opposite side from the inner cylinder portion 45 is equal to that of the first cam 23.
The diameter is set so as to fit with the outer peripheral portion 23b. Extension tube part 46
A partition wall 44a is provided between the axial inner end portion of a and the axial inner end portion of the inner cylindrical portion 45, and the first cam 23 is provided on the partition wall 44a.
A second cam 47 is provided that engages with. Second cam 47
Has a ridge portion and a valley portion that are symmetrical to the ridge portion and the valley portion of the first cam portion 24, and they engage with each other and rotate, so that the tubular portion 44 is axially moved by the cam action. Move in the direction.

FIG. 5 is a vertical sectional side view of the operation handle.
The operation handle body 12 on the grip portion 11 is configured by joining and integrating the left and right members 13 and 14 described above. As shown in the figure, by joining the left and right members 13 and 14, a front downwardly inclined opening 12a is formed by the above-mentioned notch 13c, and a top rearwardly downwardly inclined rearward opening 12b is formed. The cutouts 13d and 14d are formed, and the opening 12c formed in the lower half of the rear part is formed by the cutouts 13e and 14e.
The pipe 20 described above stands and is held on the operating rod 5,
The grip 20 is surrounded by the grip-shaped grip portion 11, and the pipe 20 extends vertically through the grip portion 11. In the upper half of the rear part of the grip portion 11, a vertically elongated concave portion 11a is provided so as to dip forward.
When gripped, the lever portion 41 is housed in the recess 40.

A through hole 20a is provided in the lower portion of the pipe 20, and the outermost member 37c of the control cable 37 is led out from the through hole 20a to control the rule cable 37.
Is from the opening 11b at the bottom of the grip 11 to the prime mover 3 described above.
Connect to the vaporizer. The lower part of the pipe 20 also has the opening 11
It is led out downward from b and is supported on the above-mentioned operating rod 5. The upper end of the outer 37b of the control cable 37 is provided with a mouthpiece 37d, the mouthpiece 37d is held by a locking portion 13h provided on an upper portion of the holding portion 13f of the member 13, and the inner 37a of the control cable 37 is attached to the slotter lever 30. A piece 38 at the tip end is engaged with and held by the holding portion 36. The upper end of the pipe 20 has the left and right members 13,
It is held between the holding portions 13f and 14f provided between the lower portions of 14 (see FIG. 7), the screw 64 is passed through the through holes 13g and 14g provided in the lower portions of the members 13 and 14 (see FIG. 7), and the nut 6
The pipe 20 and the operation handle body 12 are connected while connecting the lower parts of the members 13 and 14 at 5.

The starting switch 80 of the prime mover 3 is fitted in the opening 12b in the upper rear half of the main body 12, and the cylinder shafts 15, 16 of the upper members 13, 14 in the front of the main body 12 are fitted. , Through the screw 63, the cylinder shaft portion 32 of the throttle lever 30 is fitted to the cylinder shaft portions 15 and 16 from the outside, and the lever portion 31 is tilted forward and downward from the opening 12a provided in the front portion of the main body 12. Project to. Coil portion 67 of return spring 67
a is wound around the cylinder shaft 32, and one end 67b is attached to the main body 12
The other end 67c of the lever portion 31
5, and the throttle lever 30 is urged to rotate in the clockwise direction in FIG. 5 about the cylinder shaft portion 32 as a fulcrum. In this state, the lever portion 31 is lifted as shown in FIG. 5, and is projected forward so as to be inclined forward and downward. This state is the neutral position.

The support shaft 61 is disposed in the width direction in the middle of the main body 12 below the screw 63, and the support shaft 61 has an arc shape provided on the fan-shaped piece 33 of the throttle lever 30. The guide long hole 34 is penetrated. Around the support shaft 61, the cylindrical portion 4
The lever portion 41 of the lock lever 40, which is rotatably fitted and supported via the inner cylinder portion 45 of the No. 4, extends rearward from the opening 12c in the rear lower half of the main body 12 so as to incline rearward. Be done. The return spring 68 has one end portion 68 a locked to the hook portion 43, the other end portion 68 b locked to the screw 69 fixed to the shaft portion 19 projecting from the inner surface of the top of the member 13, and the lock lever 40.
Is urged to rotate counterclockwise in FIG. 5 with the support shaft 61 as a fulcrum. Part of the upper surface of the lever portion 41 of the lock lever 40
The half bodies 13 and 14 are brought into contact with the lower surfaces of the chamfered portions of the cylindrical shaft portions 17 and 18 formed by joining the half bodies 13 and 14 with screws 63 to form a stopper. As shown in FIG. 5, the lever portion 4 is slanted backward and downward.
The state in which 1 is projected is the neutral position.

FIG. 6 is a sectional view taken along line 6-6 of FIG. The peripheral piece portions 13b and 14b of the left and right members 13 and 14 are butted, and the screw 63 is passed through the cylindrical shaft portions 15 and 16 provided in the front portion of the inner side surface upper portion of the members 13 and 14 and screwed together to form both front portions. It can be understood that the upper part is coupled, the cylinder shaft part 32 of the throttle lever 30 is fitted around the cylinder shaft parts 15 and 16, and the coil part 67a of the return spring 67 is wound around the outside thereof. Also, screws 63 are attached to the cylindrical shaft portions 17 and 18 at the lower rear portions of the members 13 and 14.
It is possible to understand the structure in which the rear and middle parts of both are joined together through. As described above, the lever portion 41 contacts the stopper portion formed by the chamfered lower surfaces of the cylindrical shaft portions 17 and 18 to hold the neutral position. The Control B Lumpur cable 37 frames for holding the ends of the inner 37a of, fitted to the holding portion 36 of the throttle lever 30, it is possible to understand the state held.

FIG. 7 is a sectional view taken along line 7-7 of FIG. The upper end of the pipe 20 is held by the holding portions 13f and 14f below the members 13 and 14, the screws 64 are passed through the through holes 13f and 14f, and the nuts 65 are tightened.
The lower ends of the pipe 20 and the pipe 20 are fastened together and connected. With the fan-shaped piece 33 of the throttle lever 30, the knob 35 protruding from the tip of the surface on the member 14 side is fitted into the arc-shaped guide elongated hole 22 provided in the base plate portion 14a of the left member 14, and The ends project from the outer surface of the body 12 in the joined state. Set the small diameter portion 35a at the tip of the knob 35 to 2
Fit into the recess 60a provided on the back surface of the next adjustment lever 60,
A screw 66 is inserted from the end face to connect with the lever 60. The secondary adjustment lever 60 is arranged outside the left side surface of the main body 12.

FIG. 8 is an enlarged view of the support shaft portion, showing the pressing mechanism of the throttle lever. In the embodiment, the support shaft 61 includes a circular head portion 61a having a large diameter and a shaft portion 6 having a smaller diameter than this.
1b and a male screw portion 61c provided at the tip of the shaft portion, and has a bolt shape. The head portion 61a is the substrate portion 14a of the member 14.
The wrench is loosely fitted in the through hole 21 provided in the, and, for example, a wrench is inserted into the hexagonal hole 61d formed in the end face of the head and rotated. Instead of this, a head having a hexagonal outer shape may be used, and in this case also, the head is loosely engaged with the through hole 21 and is rotatable. The shaft portion 61b of the support shaft 61 is passed through the arc-shaped guide elongated hole 34 provided in the fan-shaped piece 33 of the throttle lever 30, and the shaft portion 61b is further inserted into the cylinder hole 45a of the inner cylinder portion 45 of the cylinder portion 44 of the lock lever 40. Pass through. The male screw part 61c is the member 13 on the right side.
Through the support hole 23a of the first cam 23 that is integrally provided on the inner surface of the base plate portion 13a.
To the outer surface of. At this time, a collar 70 was provided in the support hole 23a, and an annular recess 13i was provided on the outer surface of the portion having the first cam 23 to accommodate the half of the nut 62. Incidentally, instead of the collar, an insert nut may be used in order to ensure the fixing of the support shaft 61 to the handle body 12, and in this case, the nut 62 constitutes a lock nut.

The outer cylinder portion 46 of the cylinder portion 44 of the lock lever 40.
The above-mentioned first cam 23 is rotatably fitted in the inner peripheral portion 46b of the extension cylinder portion 46a provided in the above, and the cam portion 24 provided on the axial end surface of the first cam 23 and the extension cylinder portion The cam portion 48 of the second cam 47 provided on the axial bottom of 46a is engaged. When engaging the cams 23 and 47, the extension cylinder portion 46a
Since the first cam 23 is fitted in the inner peripheral portion 46b of the, the intrusion of dust and dirt between the cam portions 24 and 48 is prevented, and the dust and the like of the cam portions 24 and 48 are protected from dust and the like. It is possible to ensure the stability and reliability of the operation of the pressing mechanism. A disc spring, which is a means for elastically urging and biasing from the outside, between the surface of the fan-shaped piece 33 of the throttle lever 30 on the member 14 side and the end surface 61d of the head 61a of the support shaft 61 around the shaft portion 61b of the support shaft 61. 52, a washer 53 inside this, and a rubber plate 54 in contact with the side surface of the fan-shaped piece 33. On the half-side surface of the fan-shaped piece 33, a rubber plate 54, a washer 53, a disc spring 52 are arranged from the inside.
Is fitted so as to fit around the shaft portion 61b, and a washer 53 is further interposed between the disc spring 52 and the end surface of the cylindrical portion 44 of the lock lever 40.

The pressing mechanism 50 for the throttle lever 30 is constructed as described above. In the throttle lever 30, the fan-shaped piece 33 is pressed from both sides by the disc springs 52, 52 with an appropriate pressing force in the axial direction. The throttle lever 3
Since the support shaft 61 is a bolt, the elastic force urging force by the pressing mechanism to 0 moves to the left and right in the axial direction of FIG. It is possible to adjust the pressing force on 30.

FIG. 9 is an external side view showing the throttle levers operation, and the lock lever operation state. Next, the operation of the throttle lever of the operation handle 10 and the operation of the lock lever will be described.
Hold with H. The upper half of the grip portion 11 and the body 12 with the palm
The lower half part is grasped, and the lever part 31 of the throttle lever 30 protruding forward of the main body 12 is pulled and pressed by the index finger F2. As a result, the throttle lever 30 is rotated rearward, and the thumb F is rotated at a predetermined angle of the throttle lever 30.
1 The lever portion 4 of the lock lever 40 by the lower palm portion
1 is pressed forward, and the thumb F1 is pressed against the rear surface of the secondary adjustment lever 60.

FIG. 10 is a vertical cross-sectional side view showing the relative positions of the internal mechanism in the state of FIG. Throttle lever 3
By pulling the lever part 31 of 0 backward with the index finger F2,
The throttle lever 30 rotates counterclockwise against the return spring 67 with the cylinder shafts 15 and 16 as fulcrums. As a result, the inner 37a of the control cable 37 is pulled upward and acts in the direction of opening the throttle valve of the carburetor of the prime mover 3, thereby adjusting the output of the prime mover 3 in the direction of increasing it.
FIG. 10 shows the upper limit state (full throttle state) of the output adjustment of the prime mover 3. Subsequent, or together with the adjusting operation of the throttle levers 3 0 to press forward the lever portion 41 of the lock lever 40 with the palm. The lock lever 40 rotates in the clockwise direction in FIG. 10 about the support shaft 61 as a fulcrum against the return spring 68. As a result, the second cam 47 provided inside the tubular portion 44 rotates, and the second cam 47 is fixed to the first cam 23.
Since the cam portions 48 and 24 are engaged with each other, the cam action causes the second cam 47, and thus the lock lever 40 including the tubular portion 44, to move toward the throttle lever 30 in the axial direction.

As a result, the pair of disc springs 52, 52 sandwiching the fan-shaped piece 33 of the throttle lever 30 are pressed in the closing direction, and the pressing force on the fan-shaped piece 33 is increased. Therefore, the pressing force of the pressing mechanism 50 to the throttle lever 30 to the throttle lever 30 becomes strong, and the throttle lever 30 is pressed and held at that position. This state is shown in Figure 10.
Is. Since the guide elongated hole 34 of the throttle lever 30 is an arc centered on the cylinder upper portions 15 and 16 which are the support shafts, even if the support shaft 61 and the guide elongated hole 34 are in an engaging relationship, the rotation thereof is not supported. Done.

The secondary adjusting lever will be described. The secondary adjustment lever 60 is fixed to the knob 35 of the throttle lever 30 protruding from the elongated guide hole 22 as described above.
As shown in FIG. 9, the thumb F1 is applied to the rear surface of the secondary adjustment lever 60, and the lever portion 31 of the throttle lever 31 is pulled by the index finger F2 as shown in FIG. Press 60 forward. This allows
The throttle lever 30, which is locked by the lock lever 40, rotates around the cylinder shaft portion 32 as a fulcrum via the knob 35 against the pressing force of the pressing mechanism 50 and slips clockwise in FIG. To do. This rotation is performed by the member 14
This is allowed by the arc-shaped guide elongated hole 22 provided in the base plate portion 14a.

Therefore, when it is desired to press the throttle lever 30 to the full throttle position and then decrease the output (rotation speed) of the prime mover 3 (low rotation speed), the lock state of the lock lever 40 is maintained. By pressing the secondary adjustment lever 60 forward, the throttle lever 30 rotates in the direction of decreasing the output, and the throttle lever 3
The output (rotation speed) of the prime mover 3 can be adjusted while maintaining the locked state of 0. At this time, since the secondary adjustment lever 60 is operated by the thumb F1 in the push-hand direction, it is easy to apply force to the finger, and the secondary adjustment of the throttle lever 30 by the secondary adjustment lever 60 is performed with good operability. It can be easily performed under the lock operation state by the lock lever 40.

FIG. 11 is a view showing another example of the pressing mechanism,
It is a figure which shows the state before lock operation of a lock lever. other
In the description of the above example, the same parts as those in the above-described embodiment of the present invention are denoted by the same reference numerals and detailed description thereof will be omitted. The cylindrical portion 144 provided at the base of the lock lever 40 includes annular recesses 144a and 144b on both sides in the axial direction. Member 13
A second cam 47 is provided on the axial bottom of the side recess 144a. Further, in the recessed portion 144b on the side of the member 14, that is, on the side having the throttle lever 30, the disc spring 152 is locked by the retaining ring 171 on the shaft portion 61a of the support shaft 61. The disc spring 152 moves the tubular portion 144 to the right in the drawing, and thus the cam 2
3 and 47 are installed so that they are elastically biased in a direction in which they engage with each other. On the other hand, on both sides around the support shaft 61 of the fan-shaped piece 33 of the throttle lever 30, rubber plates 154 and 154 are provided inside.
And washers 153, 153 on the outside of the shaft portion 6
1b is fitted and inserted. 172 in FIG.
Is an annular recess 144 provided at an axially intermediate portion of the tubular portion 144.
The sealing grease filled in c may be replaced by an O-ring. As described above, the pressing mechanism 1
Make up 50.

As shown in FIG. 11, in the throttle lever 30, there is a gap between the washer 153 on the lock lever 40 side of the fan-shaped piece 33 and the opposite end of the cylindrical portion 144. Therefore, the pressing mechanism 150 provided on the lock lever 40
The pressing force due to does not act on the throttle lever 30 at all, and is held in the state of FIG. 5 by the elastic force of only the return spring 67 described above.

FIG. 12 shows another example of FIG.
It is a figure which shows the state which carried out the lock operation of the lock lever. By pushing the lock lever 40 as shown in FIG.
The reference numeral 44 rotates around the shaft portion 61b of the support shaft 61. As a result, the tubular portion 144 moves leftward in the drawing against the disc spring 152 due to the mutual engagement of the cam portions 24 and 48. Tubular part 144
Of the throttle lever 30 through the rubber plate 153 to the supporting shaft 61 through the rubber plate 154 and the washer 153. Inner end face 61e of the head 61a of the
Press on. This state is shown in FIG.
The throttle lever 30 is locked and held at the adjustment position.

In the other examples described above, the operation force of the throttle lever 30 is lighter than that of the above- described embodiment of the present invention . The operation force of the throttle lever 30 is the return spring 67,
And the resistance force to the resultant force of the pulling force of the control cable 37. And the throttle lever 30
After the adjusting operation of (1), the lock force is applied for the first time by locking the lock lever 40 as described above.

As described above, in the embodiment and other examples , the pressing mechanism 5 is used.
Although a disc spring is used as the pressing and urging means for 0 and 150, a coil spring or the like having a small axial width may be used. In the embodiment and other examples , the operation lever device of the brush cutter is described as an embodiment, but the operation lever device is not limited to this. The following work machines are targeted for implementation.

FIG. 13 shows a pruning saw machine 201 driven by a prime mover 203. The saw machine 201 is provided with a prime mover 203 at a rear portion thereof and a grip handle 207 on a side of a main body 203a. Is equipped with the above-mentioned operation lever device, and is a prime mover 2
Operate 03. The pruning work of the tree is performed by the saw portion 206 protruding forward from the main body 203a. The operation lever device according to the present invention can be also applied to the pruning saw 201.

FIG. 14 shows an example in which the chemical spraying machine 301 is used. A worker M carries a prime mover 303 on a frame 302, and a chemical solution tank with a pump 390 is mounted below the prime mover 303 on the frame 302. Rigid pipe 3
05 is equipped with a spray nozzle 306 at the tip of the pipe 305
A handle 307 for gripping is provided at the base of the
It is gripped with H, and the above-mentioned operation lever device is provided in this portion. The pipe 305 and the chemical liquid tank 390 with a pump are connected by a hose 304, and the pump is driven by the driving of the prime mover 303, and the chemical liquid stored in the tank is sprayed from the spray nozzle 306 to spray the chemical liquid on trees and the like. The operation lever device according to the present invention can also be applied to such a chemical liquid sprayer 301.

FIG. 15 shows an example in which the ejector 401 is used. The operator M carries the engine M 403 on his / her back via the frame 402, and an operating handle 410 is provided at the base of an ejecting cylinder 405 corresponding to the operating rod. It is equipped with the operation lever device described above, and is operated by the right hand RH. The spout 405 is the hose 40.
4 is connected to a compressor 490 driven by a prime mover 403, supplies compressed air to a pipe 405, ejects compressed air from a nozzle portion 405a at the tip end, and collects dust such as dust on the road or fallen leaves. The operation lever device according to the present invention can also be applied to the ejector 401.

FIG. 16 shows another embodiment of the dust collector 501.
A frame 502 is equipped with a prime mover 503 and a suction machine 590 driven by this, and a hose 504 connects the suction machine 590 and a pipe 505 corresponding to an operating rod.
The base of No. 5 is equipped with an operation handle 510, which can be used as a hand RH.
The operation handle 510 is equipped with the above-described operation lever device. A dust collecting portion 506 is provided at the tip of the pipe 505.
Is equipped to collect dust and fallen leaves. Such a dust collector 5
Also in 01, the operation lever device according to the present invention can be implemented. Although an example of the working machine is shown in FIGS. 13 to 16 above, the target of the operation lever device according to the present invention is as follows.
The present invention is not limited to the above, and can be implemented as an operating lever device for various types of working machines with a prime mover.

[0044]

The present invention has the following effects due to the above configuration. According to a first aspect of the present invention, in a working machine including a working tool driven by a prime mover and an operating handle having an operating section for controlling the prime mover, the operating section provided on the operating handle includes a throttle lever and an operating position of the throttle lever. With a lock lever that regulates via a pressing mechanism, the pressing mechanism is
A first cam integrally formed with the main body of the operation handle coaxially with the support shaft of the lock lever, a second cam provided on the lock lever engaging with the first cam, and a second cam of the second cam. constituted by the pressing biasing means arranged on a side opposite to the surface, before
Note that the second cam is provided with the slot via the pressing biasing means.
Since the torque lever is pressed, it is possible to reliably lock the throttle lever at the operation position by the lock lever by the pressing mechanism attached to the lock lever.

In particular, according to the present invention, since the two cams forming the lock lever pressing mechanism for locking the throttle lever are formed integrally with the operation handle body, the number of parts can be reduced. The structure of the pressing mechanism can be simplified. Further, by integrating the first cam with the handle body in advance, the number of man-hours for assembling the cam is reduced in assembling the operation lever device, and the operation lever device having excellent assembling property can be obtained. Further, since the cam is provided integrally with the operation handle body, the second cam is formed and assembled with the first cam on the operation handle side as a reference, so that the cam mechanism of the pressing mechanism with good accuracy can be obtained.

According to a second aspect of the present invention, in the first aspect, the tubular portion is provided on one of the outer periphery of the first cam integrally provided on the main body of the operating portion or the outer periphery of the second cam provided on the lock lever, and the other of the two is provided. Since the cam is fitted in the tubular portion, the first cam and the second cam have an inner and outer fitting relationship, and in addition to the effect of claim 1, dust and dirt are present between the two cams. It is possible to prevent intrusion. Therefore, it is excellent in dustproofness, and it is possible to prevent dust and dirt from entering between the cams, and to ensure the reliable and smooth operation of the cams. In particular, with a brush cutter, chemical sprayer, dust collector, etc. that work outdoors where there is a lot of dust, there is a danger that dust and dirt will enter the operating section, ensuring a high degree of dust resistance and operating the throttle lever locking mechanism. This is preferable for ensuring the reliability and smoothness. Further, as a structure for ensuring dustproofness, it can be achieved by forming one of the facing cams as a protrusion and the other as a cylinder or a recess to be fitted therein, so that the structure is simple.

According to a third aspect of the present invention, in the first aspect, the pressing biasing means is configured to engage the first and second cams with each other to press a part of the throttle lever. In addition to the effect, when operating the throttle lever, in addition to the pulling force of the throttle lever control cable,
An appropriate frictional force can be obtained by the pressing and urging means of the pressing mechanism. Therefore, it is possible to obtain an appropriate resistance in the operation of the throttle lever, and to obtain a throttle lever with good operability.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of work by a work machine.

FIG. 2 is a perspective view showing the appearance of an operation handle.

FIG. 3 is an exploded perspective view of the main body of the operation portion of the operation handle, showing the individual components in an exploded view.

FIG. 4 is an explanatory enlarged perspective view of a cam portion for explaining a first cam and a second cam.

FIG. 5 is a vertical sectional side view of the operation handle.

6 is a sectional view taken along line 6-6 of FIG.

7 is a sectional view taken along line 7-7 of FIG.

FIG. 8 is an enlarged view of a support shaft portion showing a pressing mechanism of a throttle lever.

FIG. 9 is an external side view showing the state of operating the throttle lever and the lock rubber.

FIG. 10 is a vertical cross-sectional side view showing the relative positions of the internal mechanism in the state of FIG.

FIG. 11 is a view showing another example of the pressing mechanism, showing the state before the lock operation of the lock lever.

FIG. 12 is a diagram showing a state where the lock lever is locked in another example of FIG. 11.

FIG. 13 is an explanatory view showing another example implemented in a pruning saw driven by a prime mover.

FIG. 14 is an explanatory diagram showing an example implemented in a chemical sprayer.

FIG. 15 is an explanatory view showing an example implemented in a blower for drawing dust with compressed air.

FIG. 16 is an explanatory view showing another example implemented in the dust collector.

[Explanation of symbols]

1, 201, 301, 401, 501 ... Working machine, 3,
203, 303, 403, 503 ... Motor, 6,20
6, 306, 506 ... Work implement, 10 ... Operation handle, 12 ... Handle body, 23 ... First cam, 3
0 ... Throttle lever, 40 ... Lock lever, 46
a ... Cylindrical part, 47 ... Second cam, 52, 152 ... Press urging means, 61 ... Support shaft, 171 ... Locking means.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Ikeda, Takashi Ikeda, 1-4-1, Chuo, Wako-shi, Saitama, Ltd. Inside the Honda R & D Co., Ltd. (56) Reference: JP-A-8-303263 (JP, A) 60-41539 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/68, 34/76 A01M 7/00 F02D 11/02

Claims (3)

(57) [Claims] 1. A working machine provided with a work implement driven by a prime mover and an operating handle having an operating section for controlling the prime mover, wherein the operating section provided on the operating handle includes a throttle lever and an operation of the throttle lever. A lock lever for controlling the position of the lock lever via a pressing mechanism, wherein the pressing mechanism includes a first cam integrally formed with the main body of the operation handle coaxially with a support shaft of the lock lever, and the first cam. A second cam provided on a lock lever that engages with the cam, and a pressure urging means disposed on the side of the surface opposite to the second cam are provided, and the second cam is provided with the pressing force . The slot through the force means
And to press the Ttorureba control lever apparatus for a working machine, characterized in that. 2. A tubular portion is provided on one of the outer periphery of a first cam provided integrally with the main body of the operation portion or the outer periphery of a second cam provided on the lock lever, and the other cam is provided inside the tubular portion. The operating lever device for a working machine according to claim 1, wherein the operating lever device is fitted to the operating lever device. 3. The work according to claim 1, wherein the pressing biasing means is configured to engage the first and second cams with each other and press a part of the throttle lever. Machine control lever device.