JP3504181B2 - Operation handle device for work equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an improvement of the working machine operating handle device such as a brush cutter.

[0002]

2. Description of the Related Art As an operation handle of a brush cutter, the technique disclosed in Japanese Patent Publication No. 57-21962, the actual Japanese utility model publication No. 57-
There is a technique disclosed in Japanese Patent No. 42261. The above-mentioned technique has a structure in which a throttle lever is swingably disposed on an upper half portion of one surface of the operation handle, and a brake lever is disposed on a lower half portion of the same surface of the operation handle. In this structure, the operation handle is grasped by the hand, and the throttle lever and the brake lever arranged on the same side are selectively pulled with the finger. According to the above-mentioned technique, the throttle lever is swingably arranged on the upper half part of one surface of the operation handle , and the brake lever is arranged on the lower half part of the other surface facing the operation handle so as to be rotatable around the handle member. The structure is arranged. With this structure, hold the operating handle with your hand, pull the throttle lever with your finger, apply the part of the palm near the wrist to the brake lever, twist your wrist along the circumference of the handle member, and move the brake lever around the handle member. Rotate and release the brake lever.

[0003]

When a brush cutter is used as a working machine, for example, when the brush cutter is used to mow the weeds, vibrations caused by the surrounding work environment, continuous work, and the operation of the brush cutter are considered. , Etc. put a heavy burden on the operator's hands and arms. As a result, the hands and arms are fatigued, and the gripping force and gripping state of the operating handle are constantly changing. Under such circumstances, the weeding work of the weeds by the bush cutter is performed.

The conventional techniques mentioned above have the following problems. In the technology, since both the throttle lever and the brake lever are provided on the same surface of the operation handle, when the operator grips the operation handle by hand and operates the throttle lever and the brake lever, It is necessary to grip the operation handle and the brake lever with the fingers and then perform the pulling operation while controlling the throttle lever with the fingers.
As you can see from this, grasping the handle with your finger,
Brake lever and throttle lever operations are concentrated, and the operator's hands, especially fingers, tend to get tired. Therefore, it becomes difficult to maintain and hold the work posture of the brush cutter or the continuous work, unevenness in finishability after weeding of weeds or the like occurs, and fatigue of the operator increases.

In the technique of (1), while operating the throttle lever of the operating handle with a finger, the operator operates the brake lever by gripping the operating handle with the palm and twisting the wrist to rotate the brake lever around the handle member. It is necessary to operate to maintain and hold in the releasing direction. As can be understood from the above, it is necessary to operate the throttle lever with your finger, put your palm on the brake lever, and twist your wrist. Easy,
In addition, the twisting of the wrist is required, which limits the posture for work. In addition, with this structure of the technology, the throttle lever operation by the operator's finger and the brake lever release operation by twisting the wrist are performed at the same time, so the brake lever release operation by the wrist twist operation is performed by the finger. May affect the operation of. This means that the "open" operation of the throttle lever and the "release" operation of the brake lever may be simultaneously executed in parallel, which may impair the workability of the brush cutter.

In addition to the above, in the above structure, since the fulcrum portion of each lever and the wire are exposed to the outside of the operation handle, the operation stroke becomes large when operating the lever, which makes it difficult to operate the lever. There is a possibility that the operability of the lever operation may be deteriorated, which in turn may impair the operability and workability of the brush cutter. The above is a common problem in various working machines equipped with the same operation handle device.

The present invention has been made to solve the above problems. An object of the present invention is to first operate a throttle lever and a brake release lever arranged on an operation handle device by a pulling operation with a finger while holding a handle member and a simple operation by a palm holding the handle member. The operation of both the throttle lever and the brake lever is smooth, easy, and reliable to improve the operability, and the operation handle is securely held, and the posture of the work machine is ensured. It is possible to easily respond to changes in the operating conditions and holding / maintenance of the working machine, and to reduce fatigue of the operator when operating these levers, and to improve the operability and workability of the working machine. To provide an operating handle device.

Another object of the present invention is to make it possible to store the respective operation arm portions of the wires of the respective levers in the handle portion and arrange them by wrapping them, and wrap each operation arm portion in the handle portion. It is possible to make the outer shape of the operating handle easy to grip while arranging the arms, and to secure the length of each arm to ensure smooth operability of the throttle lever and brake release lever. An operation handle device is provided. It is also an object to obtain an operation handle device for a working machine in which the operation arm part of each lever and a wire are housed in the handle part of the operation handle to facilitate the lever operation and protect the wire. To do. Further, both the brake release lever and the throttle lever constitute a lock mechanism to ensure that the brake release lever holds the brake lock position and the throttle lever lock position, and the smooth and easy operation of these lock position release operations. (EN) Provided is an operating handle device for a working machine capable of facilitating holding of a turning position (holding of a throttle adjusting position) when operating a lever.

[0009]

In order to solve the above problems, a first aspect of the present invention is to provide a prime mover attached to one end of an operating rod.
A working machine having a working tool attached to the other end of the operating rod, the operating rod having a brake mechanism for the working tool, in which the operator operates the power of the prime mover. In addition, in the operating handle device of the working machine, which is provided with a handle portion to be held by a hand for holding the working posture of the working machine, and the handle portion includes a throttle lever and a brake release lever, The operator holds the throttle lever that is operated by pulling or loosening the finger on the finger side in a state of being gripped by an operator, and the operator grips the palm side in a gripping direction of the palm in a state of being held by the operator. only set at the operating brake release lever for releasing the brake mechanism, before
The throttle lever and the brake release lever are
Rotor lever and the brake release lever and the prime mover
Connect to the throttle mechanism of the
Each arm has an attachment part to attach each wire
Each arm part is arranged in the handle part and
Place the wire attachment part of the cable part so that it does not interfere
Characterized in that it was.

According to the first aspect, when the handle portion is gripped,
The throttle lever is arranged on the finger side, and the brake release lever is arranged on the palm side.The operation of each lever is shared by the fingers and palm, and the operator pulls the finger by hooking it on the throttle lever and pulling the wrist. Each operation of the throttle lever and the brake release lever can be performed by a simple pressing operation on the handle portion of the brake release lever without requiring any twisting operation. Then, each lever is
The arm part connected to the wire of the
The wire mounting parts are arranged so that they do not interfere with each other.
Therefore, it is necessary to secure the operation arm length of each lever.
And reduce the operating force of each lever to ensure proper operation.
You can In the handle part, the arm part,
The mounting parts can be arranged while wrapping adjacent to each other.
Hand while storing the arm and wire in the handle
The outer shape of the lever does not become large, and each lever is
Place them as close as possible while arranging them at symmetrical positions of the dollar part
Operation handle that can be easily gripped and lever operated
Can be obtained.

A second aspect of the present invention is characterized in that, in the first aspect, the inside of the handle portion is hollow and the wires are passed through the handle portion. According to the second aspect , it is advantageous in protecting the wire, and since the wire is not exposed to the outside of the handle portion, the operability of the operation handle is good.

According to a third aspect of the present invention, in the first aspect, an end portion of the arm portion of the throttle lever is provided with an abutting portion that abuts against the brake release lever, and the brake release lever has an arm portion of the throttle lever. It is characterized in that it comprises a sliding portion which abutting portions of the end portions of the sliding contact with and slides, and a concave portion which is provided in a portion adjacent to the sliding portion and into which the corresponding contact portion fits.

According to the third aspect of the present invention, the brake release lever and the throttle lever are locked by the concave and convex fitting between the contact portion at the end portion of the arm portion of the throttle lever and the recessed portion of the arm portion of the brake release lever. A simple mechanism can be surely performed without requiring a separate mechanism. Further, since the contact portion of the end portion of the arm portion of the throttle lever slides with respect to the sliding portion of the arm portion of the brake release lever, it is possible to obtain an appropriate friction, and when operating the throttle lever, It becomes easy to hold the rotation adjustment position.

[0014]

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. 7 shows a brush cutter as an example of the working machine, and in the figure, it is an explanatory view showing a state of the weeding work of the weeds. The brush cutter 50 includes a prime mover 52 at a rear end portion of the operating rod 51 and a cutting blade 53 at a front end portion thereof. The cutting blade 53 is rotated by the power of the prime mover 52 to perform weeding work for weeds, etc. A power transmission member (not shown) transmits power from the output unit (not shown) to the cutting blade 53 through the operating rod 51.

The prime mover 52 has a throttle mechanism (not shown) for adjusting the output of the prime mover, and the cutting blade 53 has
A brake mechanism (not shown) that locks and releases the rotational drive is provided. A shoulder belt 54 is provided on a portion of the operating rod 51 near the prime mover 52, and the worker M carries the work by carrying the work implement 50 on his shoulder via the shoulder belt 54. The middle portion of the operating rod 51 is provided with a gripping handle 55 that stands up and protrudes outward in the radial direction of the operating rod 51, and the worker M grips the gripping portion 55a of the gripping handle 55 with the left hand LH in the figure, On the other hand, in front of the grip handle 55, the operation handle 1 is provided so as to stand and project outward in the radial direction of the operation rod 51, and the operation handle 1 is gripped by the right hand RH to release the brake or to drive the prime mover. Weeding work is performed while adjusting the output.

FIG. 1 is an external perspective view of an operation handle of the brush cutter as the working machine. Operation handle device 1
Is a handle body 2 standing upright and protruding from the outer circumference of the operating rod 51, a grip portion 3 provided in an upper half of the handle body 2, and a head 4 provided on an upper end portion of the grip portion 3. Become. The handle portion is constituted by these. The operation portion of the throttle lever 9 is arranged on the front edge side of the head portion 4, and the operation portion of the brake release lever 11 is arranged symmetrically on the opposite rear edge side.

FIG. 2 shows the operation handle device 1 shown in FIG.
FIG. The handle main body 2 is formed of a pipe material, and is provided so as to stand and project radially outward in a part of the outer peripheral portion of the operating rod 51. The upper circumference of the handle body 2 is covered with the grip portion 3. The grip portion 3 has, for example, a gun grip outer shape and is formed of resin or the like, and the middle portion in the height direction is slightly curved backward so that it is easy to grip, and the left and right widths and the front and rear widths are also easy to grip. Set to dimensions. Inward and downward recesses 3a and 3b are formed symmetrically above and below the front and rear portions of the grip portion 3, and the grip portion 3 is provided so as to cover the front of the upper portion of the handle body 2.

The upper portion of the throttle wire 5 and the brake wire 6 are internally passed through the hollow portion inside the handle body 2 described above, and the lower portion of the portion through which the wires 5 and 6 are passed is the grip portion 3 of the handle member 2. The lead-out portion is led out to the outside of the rear portion through a through hole 2a provided in the lower rear portion of the, and the lead-out portion is bundled and led out as one cable 7. The head 4 is mounted on the grip 3 on the upper end of the handle body 2.

As shown in FIG. 1, the head portion 4 is a structure in which the left and right divided bodies 4a and 4b are joined and integrated. The head 4 is provided with openings 4c and 4d on the lower side and the front and rear sides, and the upper surface 4
e, the rear surface 4f continuous with this is closed, the front opening 4c is formed in front of the upper surface 4e, and the rear opening 4d is formed below the rear surface 4f. Front opening 4
A support shaft 8 is provided in the front part of the head 4 above c, and the support shaft 8 has an intermediate bent portion 9 of a substantially inverted L-shaped throttle lever 9.
Also, a is pivotally supported, and a tip portion 11a of a brake release lever 11 is pivotally supported by an intermediate support shaft 10 in the head portion 4, and the brake release lever 11 is substantially linear.

The bent tip portion 9b of the throttle lever 9 protruding from the front opening portion 4c of the head portion 4 to the front surface of the head portion 4 is easy to be familiar when pulling operation with a finger. As shown in FIG. 1, it has a width to the left and right and is formed to have a concave cross section. The rear portion 11b having a length of the brake release lever 11 protruding from the rear opening 4d of the head portion 4 to the rear surface of the head portion 4 has a width so that the palm fits well, and is formed in an inverted L-shaped cross section.

The shaft supporting portion 9a of the throttle lever 9 and the arm portion 9c extending rearward from the shaft supporting portion 9a are housed in the head 4.
It is arranged. Also, the shaft support 1 of the brake release lever 11
A portion from the longitudinal middle portion including 1a is housed and arranged in the head portion 4, extends forward from the shaft supporting portion 11a, and includes an arm portion 11c bent from the shaft supporting portion 11a in an inverted L shape, In addition, a stopper arm portion 11d that stands upright from the shaft support portion 11a is integrally provided, and the stopper arm portion 11d and the arm portion 11c are arranged in a V shape at an angle.

The piece 5b provided at the tip of the inner 5a of the throttle wire 5 is attached and held via the attachment portion 12 at the tip of the arm portion 9c of the throttle lever 9. Further, the piece 6b provided at the tip of the inner 6a of the brake wire 6 is attached and held via the attachment portion 13 at the tip of the brake release lever 11. The guides 5c, 6c at the upper end from which the inners 5a, 6a of the respective wires 5, 6 are drawn out are held on the upper end 2b of the handle body 2 by a holder 14 provided in the lower part of the head 4, This portion of 4 is fixed to the handle main body 2 with a screw 15 provided in a portion near the upper end of the handle main body 2.

The above-mentioned arm portion 9 of the throttle lever 9
A square fitting protrusion 16 (abutting portion) is provided at the rear end of c, while the fitting recess 1 is provided above the shaft support 11a of the stopper arm 11d of the brake release lever 11.
7 is provided, in the locked state of the brake release lever 11 and the open state of the slotter lever 9 as shown in the drawing, these concave-convex fitting portions 16 and 17 are fitted, and the brake release lever 11 is in the locked state and the slotter lever 9 is in the open state. Lock and hold. Further, the throttle lever 9 is provided at the tip of the fitting concave portion 17 of the stopper arm portion 11d of the brake release lever 11.
The sliding surface 18 (sliding portion) slidably abutting the end surface of the fitting convex portion 16 at the rear end portion of the arm portion 9c is provided.

Around the shaft support 9a of the throttle lever 9,
The torsion spring 19 is wound, and one end of the torsion spring 19 is attached to the head 4
And the other end is hooked on the throttle lever 9.
A torsion spring 20 is wound around the shaft supporting portion 11a of the brake release lever 11, and one end of the torsion spring 20 is attached to the head 4.
Further, the other end is hooked on the brake release lever 11.
As a result, the throttle lever 9 is rotated and biased around the support shaft 8 in the direction of arrow A in the figure (the opening direction of the throttle lever 9), and around the support shaft 10 of the brake release lever 11 in the direction of arrow B (the brake). (The direction to lock the release lever 11)
Rotate and urge. In the figure, reference numeral 21 is a stopper for positioning the brake release lever 11, and 22 is a release switch of the prime mover.

FIG. 3 is a sectional view taken along line 3-3 of FIG. The arm portion 9c of the throttle lever 9 and the arm portion 11c of the brake release lever 11 are arranged in the head portion 4 so as to be slightly overlapped in the left-right direction and wrap in the left-right direction. They are arranged crossing as shown. Each arm portions 9c, 11c is in Na <br/> over wires 5a, projecting symmetrically each inwardly spaced mounting parts 12 and 13 are front and rear 6a, in Na over wire 5
a and 6a are spaced apart in the front-rear width direction of the head 4 in the front-rear direction and are arranged in substantially the same vertical plane.
It is configured so that they do not interfere with each other when the 11c rocks. In the embodiment, the support shafts 8 and 10 are projectingly provided on one of the left and right halves 4a and 4b of the head 4, and the screws 23 and 24 are passed from the other end to the support shafts 8 and 10 to form the halves 4a and 4b. Combined with each other.

Next, the operation of the operation handle device described above will be described. FIG. 2 shows a state in which the brake operating lever 11 is not unlocked and the throttle lever 9 is open. The levers 9 and 11 have springs 19 and 2 described above.
By the action of 0, it is urged in the directions of arrows A and B in FIG.
The brake operating lever 11 contacts the stopper 21 and is restricted from rotating in the direction of arrow B, and is held at the position shown in the figure. Further, the fitting convex portion 16 of the rear end portion of the arm portion 9c of the throttle lever 9 is fitted into the fitting concave portion 17 of the brake release lever 11, whereby the rotation of the throttle lever 9 in the arrow A direction is restricted, The brake lock state of the brake operating lever 11 and the open state of the throttle lever 9 shown in FIG. 2 are held in the locked state. In this state, the concave-convex fitting portion 1
It is held by fitting 6,7.

FIG. 4 is a view similar to FIG. 2 showing a state in which the brake release lever 11 is released and set to the release position, and the throttle lever 9 can be operated to throttle the prime mover. FIG. is there. First, the grip of the operation handle 11 and the operation of the throttle lever 9 and the brake release lever 11 are performed as follows. The grip portion 3 including the lower portion of the head 4 of the operation handle 1 is gripped by the right hand. finger,
Specifically, the index finger, or the abdomen of the index finger and the middle finger, is put on the outer surface of the tip 9a of the throttle lever 9. The abdomen below the thumb of the palm is attached to the outer surface of the rear portion 11b of the brake release lever 11. The remaining middle finger, ring finger, little finger, or ring finger,
The little finger is placed on the front surface of the grip portion 3, and the middle portion of the palm is placed on the right outer side surface of the grip portion 3. As described above, the grip portion 3 is gripped.

To release the brake release lever 11, the palm below the thumb is pushed forward and the brake release lever 11 is pushed forward. The brake release lever 11 rotates in the direction of arrow C in FIG. 4 about the support shaft 10 as a fulcrum against the elastic force and the urging force of the spring 20. As a result, the arm portion 11c rotates clockwise about the support shaft 10 as a fulcrum and moves upward, and the inner wire 6a is pulled up. The brake (not shown) is released by pulling up the inner wire 6a.

Further, when the brake release lever 11 rotates about the support shaft 8, the stopper arm portion 11d also integrally rotates in the clockwise direction and is lifted up.
d also rotates in the moving direction, and the fitting concave portion 17 thereof is provided on the rear end portion of the arm portion 9c of the throttle lever 9 so that the fitting convex portion 16 is provided.
Get out of. As a result, the throttle lever 9 is unlocked by the brake release lever 11. Therefore, the throttle lever 9 can be rotated. The rear portion 11b of the brake release lever 11 is housed in a recess 3b provided on the rear surface of the grip portion 3. This state is shown in FIG.

FIG. 5 is a view showing a state in which the throttle lever 9 is operated in the closing direction from the state shown in FIG. Next, while the brake release lever 11 is being pressed by the palm as described above, the index finger, or the index finger, the middle finger is pulled toward you. The throttle lever 9 rotates in the direction of arrow D in FIG. 5 about the support shaft 8 as a fulcrum against the resilient and urging force of the spring 19. As a result, the arm portion 9c rotates counterclockwise about the support shaft 8 as a fulcrum and moves upward, and the inner wire 5a is pulled up. When the inner wire 5a is pulled up, the throttle mechanism (not shown) for adjusting the output of the prime mover operates in the opening direction and operates in the direction of increasing the output of the prime mover. FIG. 5 shows a state where the throttle lever 9 is pulled to the limit (a state where the throttle valve is opened to the limit).
The tip portion 9b of the throttle lever 9 is housed in the recess 3a on the front surface of the grip portion 3.

FIG. 6 is a view showing a state in which the throttle lever is operated in the opening direction from the state shown in FIG. 5, and is a diagram showing a transition to the opened state. When the pressing force of the brake release lever 11 is slightly relaxed, the lever 11 rotates about the shaft 10 as a fulcrum so as to return to the counterclockwise direction in the figure to some extent by the elastic force and the urging force of the spring 20. On the other hand, when the pulling force of the throttle lever 9 is loosened, the lever 9 tries to rotate in the clockwise direction indicated by the arrow E with the support shaft 8 as a fulcrum by the elastic force and the urging force of the spring 19. On this occasion,
The end surface of the fitting protrusion 16 at the rear end of the arm portion 9c is the sliding surface 1 provided at the tip of the arm portion 11c of the brake release lever 11.
8 and slide while making contact as shown by arrow F. Due to the friction between the end surface of the fitting convex portion 16 and the sliding surface 18, an appropriate friction is given to the return rotation of the throttle lever 9, and the rotation position of the throttle lever 9 is easily held. .

As described above, by gripping the operation handle 1,
By a simple pressing operation of the palm on the rear surface of the grip portion 3 in the grip operation, the brake release lever 11 is pressed so as to be pressed against the rear surface of the grip portion 3, while the thumb or the like is pressed.
It is possible to adjust the throttle lever 9 by hooking on and pulling like a trigger. Therefore,
The operations of the brake release lever 11 and the throttle lever 9 are shared by the individual operations of the palm, the thumb, and the like. As described above, the simple operation of pressing the rear surface of the grip portion 3 of the palm, the thumb, etc. It can be easily done by hooking on and pulling like a trigger. Therefore, it is not necessary to operate both the brake release lever and the throttle lever with the thumb or the like, and it is not necessary to operate the brake release lever in an unreasonable posture of the thumb or the like to twist the palm.

When the pulling force of the throttle lever 9 is released, the lever 9 is further rotated in the F direction of FIG. 6 by the elastic force and the urging force of the spring 19, and finally the fitting convex portion 16 releases the brake. When the brake release lever 11 is released from the pushing force of the brake release lever 11, the state is returned to the state shown in FIG.

8 to 11 show another embodiment of the present invention. FIG. 11 is an explanatory view of a brush cutter 50 having an operation handle device according to another embodiment. The same parts as those in FIG. 7 are designated by the same reference numerals and the description thereof will be omitted. In the present embodiment, the operation handle device 101 has a structure in which it is provided around the operation rod 51 so as to surround it.

As shown in FIG. 8, on the outer periphery of a part of the pipe-shaped handle body 102 of the operating rod 51 (the handle body 102 forms a part of the operating rod 51 because the operating rod 51 is hollow).
The grip portion 103 is provided so as to surround this, and the grip portion 10
3 is a structure in which the left and right halves 103a and 103b are joined together to form an integrated structure, and a cylindrical grip portion 103 that is easy to grip with a hand.
To form. The brake release lever 111 is arranged on the upper surface of the grip portion 103, and the throttle lever 109 is arranged on the lower surface.
And a release switch 122 for the prime mover similar to the switch 22 described above is provided on the front portion of the upper surface.

FIG. 9 is a vertical sectional side view of the operation handle device. A tip portion 104 of the grip portion 103 bulges vertically, and a support shaft 110 is provided horizontally in an upper bulge portion 104a, and the support shaft 110 is provided with a tip portion 1 of a brake release lever 111.
11a is rotatably supported, and the lever 111 is rotated and urged in a counterclockwise direction indicated by an arrow G by a torsion spring 120. An arm portion 111c and a stopper arm portion 111d having an L shape are provided at the tip of the shaft support portion 111a (tip portion) of the brake release lever 111. The tip of the arm portion 111c is attached to the inner wire 106a of the brake wire by the piece 106b.
The wire 106a is extended to the outside through a gap between the handle body 102 and the grip portion 103.

Further, the shaft support 11 of the brake release lever 111
A fitting recess 117 and a sliding surface 118 are provided on the stopper arm portion 111d at the end of 1a. The rear portion 111b of the brake release lever 111 is exposed on the grip portion 103 through an opening 103d provided in the upper portion of the grip portion 103, and when the grip portion 103 is gripped by hand, the palm of the rear portion 1b of the lever 111 is exposed.
It is set so as to press against the upper surface of 11b.

A support shaft 108 is provided horizontally in a bulging portion 104b below the tip portion 104 of the grip portion 103, and a tip portion 109a of a throttle lever 109 is rotatably supported on the support shaft 108. The lever 109 is rotated and biased by a torsion spring 119 in the direction of arrow H which is the clockwise direction. An arm portion 109c is provided at the tip of the shaft support portion 109a (front portion) of the throttle lever 109 so as to form an L shape as a whole.
The tip portion of the arm portion 109c is connected to the inner wire 105a of the brake wire via the bridge 105b, and the wire 105a is connected to the handle body 102 and the grip portion 10.
It passes through the gap between the two and is extended to the outside.

At the tip of the arm portion 109c, there is provided a fitting convex portion 116 for fitting with the fitting concave portion 117 provided on the stopper arm portion 111d of the brake release lever 111. The rear portion 109b of the throttle lever 109 is provided with an opening portion 103c provided on the lower surface of the grip portion 103 through the grip portion 103.
It is exposed on the lower surface of the so that the thumb can easily follow it.

FIG. 10 is a sectional view taken along line 10-10 of FIG. As shown in the figure, the grip 103 includes the left and right halves 103.
a and 103b are combined to form a vertically long rectangular box-shaped cross section. The arm portion 109c of the throttle lever 109 described above is
The handle part made of pipe material is arcuate or U-shaped so as not to interfere with the outer periphery of the right half of the drawing, and the arm portion 111c of the brake release lever 111 has a symmetrical shape and has an outer periphery of the left half of the handle body 102 in the drawing. It is arcuate or U-shaped so that it does not interfere with. Therefore, this portion of both levers 109 and 111 including the shaft support portion and the arm portion is arranged symmetrically in the left-right direction and the vertical direction. Although not shown in FIG. 10, the stopper arm portion 111d of the brake release lever 111 is not shown.
Is projected from the shaft supporting portion 11a to the side opposite to the arm portion 111c, and is arranged in front of the arm portion 109c of the throttle lever 109 in the figure.

In the above, in the state shown in FIG. 9, the grip portion 103 parallel to the operating rod 51 is gripped by hand, and this portion is held with the palm up and the rear portion 11 of the brake release lever 111 is held.
1b, and the thumb or the like is applied to the throttle lever 109, and the brake release lever 111 is first pushed down against the spring 120 via the palm in the direction opposite to the arrow G. As a result, the lever 111 rotates in the same direction with the support shaft 110 as a fulcrum, and the arm portion 111c swings to the left in the drawing,
The brake wire 106a is pulled to the left in the figure, and the brake mechanism is released in the same manner as above. Further, the stopper arm portion 111d swings upward as shown by a chain line I in the figure, and the fitting between the fitting convex portion 116 and the fitting concave portion 117 of the throttle lever 109 is released.

As described above, the throttle lever 109 becomes free, and the thumb or the like pulls the rear portion 109b of the throttle lever 109 arranged on the lower surface of the grip portion 103.
Since the arm portion 109c is released from the constraint of the stopper arm portion 111d, the arm portion 109c swings in the direction opposite to the arrow H, and the arm portion 109c moves leftward in the figure as indicated by a chain line J in the figure. pull the throttle wire 105a, open the throttle mechanism, for adjusting the slot torr mechanism in the direction of outputting the prime mover is increased. Brake release lever 1
By releasing the pushing force of 11, the lever 111 returns in the direction of arrow G by the action of the spring 120, and by releasing the pulling force of the fingertip of the throttle lever 109, the lever 109 moves in the direction of arrow H by the action of the spring 119. Returning, the sliding surface 118 comes into contact with the tip end of the fitting convex portion 116 which is the abutting portion, and the end face of the fitting convex portion 116 and the sliding surface 118 are brought into contact with each other, so that the throttle lever 109 is returned. As a result, moderate friction is imparted to the movement, and similarly to the above, the rotational position of the throttle lever 109 can be easily maintained.

[0043]

The present invention has the following effects due to the above configuration. Claim 1 is a working machine comprising a prime mover attached to one end of an operating rod, a work implement attached to the other end of the operating rod, and the operating rod provided with a brake mechanism for the work implement. The work machine is provided with a handle portion that is held by a hand that holds the work posture of the work machine while an operator operates the power of the prime mover, and the handle portion is provided with a throttle lever and a brake release lever. In the operating handle device of the working machine, the handle portion is provided with the throttle lever operated by pulling or loosening the finger on the finger side while being held by the operator, and the operator of the handle portion holds the throttle lever. state, on the palm side, only setting the brake release lever to release the brake mechanism in operation in the gripping direction 該掌, Ro
The slot for the toggle lever and the brake release lever is
Lever and the brake release lever and the prime mover slot
Cable to connect the brake mechanism and the brake mechanism of the work implement.
Each arm has a mounting part to attach
Parts are placed inside the handle part, and wire attachment for each arm part
The parts were arranged so as not to interfere with each other.

According to the first aspect, when the handle portion is gripped,
The throttle lever is arranged on the finger side, and the brake release lever is arranged on the palm side.The operation of each lever is shared by the fingers and palm, and the operator pulls the finger by hooking it on the throttle lever. Each operation of the throttle lever and the brake release lever can be performed by simply pushing the palm against the handle portion of the brake release lever while holding the operation handle without requiring any twisting operation.

Therefore, when the operator operates the throttle lever and the brake release lever while gripping the operation handle, as described above, the operator pulls the throttle lever on the finger side and the brake release lever on the palm side. It is possible to obtain the operation handle device of the working machine which has good workability and is easy to work, since it is possible to surely grip the gripping portion and reduce the fatigue of the worker by sharing the pressing operation. And
In the handle part, the arm part connected to the wire of each lever is
The wire mounting parts of each arm part interfere with each other.
The levers are arranged so that they do not cross each other.
Sufficient arm length can be secured. Therefore, each
You can reduce the operating force of the lever and make it proper.
It In the handle, the arm and attachment are adjacent to each other.
Can be placed while wrapping, and each arm,
While storing the ear in the handle part,
The outer shape, especially the width, does not increase, making it easy to grip and use
Easy operation with throttle lever and brake release lever
A work handle device can be obtained. In addition, each lever
Place them as close as possible while arranging them in symmetrical positions of the handle
Can be placed, can be naturally held, easy to hold,
You can get an operation handle that makes it easy to operate each lever.
It

According to a second aspect, in the first aspect , the inside of the handle portion is hollow, and each wire is passed through the inside of the handle portion. According to the second aspect , in addition to the effect of the first aspect, it is advantageous in protection of the wire, and the wire is not exposed to the outside of the handle portion, so that the operability of the operation handle is good.

According to a third aspect of the present invention, in the first aspect , an end portion of the arm portion of the throttle lever is provided with an abutting portion that comes into contact with the brake release lever, and the brake release lever has an end portion of the arm portion of the throttle lever. And a sliding portion that abuts and slides on the abutting portion, and is provided in a portion adjacent to the sliding portion.
The contact portion has a recess into which the contact portion fits.

In addition to the effect of claim 1, the third aspect of the present invention is, in addition to the effect of the first aspect, an abutting portion at the end portion of the arm portion of the throttle lever and a concave portion at the concave portion of the arm portion of the brake release lever.
The lock between the brake release lever and the throttle lever
By the concave-convex fitting of the abutting portion and the concave portion, it is possible to surely perform with a simple mechanism without separately requiring each locking mechanism. Then, the brake release of the brake release lever and the lock release of the throttle lever are linked by the depression operation of the brake release lever causing the concave portion on the lever side to disengage from the contact portion formed by the convex portion on the throttle lever side. The unlocking operation is performed smoothly and surely, and the operability is good.

Further, since the abutting portion of the end portion of the arm portion of the throttle lever slides with respect to the sliding portion of the arm portion of the brake release lever, a proper friction can be obtained in the operation of the throttle lever. Therefore, when the throttle lever is operated, it becomes easy to hold the rotational adjustment position of the throttle lever due to friction. Further, the sudden return operation of the throttle lever can be adjusted by friction, and the throttle lever can be obtained in the operation handle device having excellent operability.

[Brief description of drawings]

FIG. 1 is an external perspective view of an operation handle of a work machine.

FIG. 2 is a vertical sectional side view of the operation handle device 1 shown in FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a view similar to FIG. 2 showing a state in which a brake release lever is released and set to a release position, and a throttle lever of a prime mover can be operated;

FIG. 5 is a diagram of a state in which the throttle lever is operated in the closing direction from the state of FIG.

FIG. 6 is a diagram showing a state where the throttle lever is operated in the opening direction from the state of FIG.

FIG. 7 is an explanatory view showing a bush cutter as an example of a working machine, showing a state of the weeding work of the weeds.

FIG. 8 is an external perspective view showing another embodiment of the operation handle.

FIG. 9 is a vertical sectional side view of the operation handle of FIG.

10 is a sectional view taken along line 10-10 of FIG.

FIG. 11 is a view similar to FIG. 7 showing another embodiment of the operation handle device in the working machine.

[Explanation of symbols]

1, 101 ... Operation handle device, 2, 3, 4, 10
2, 103 ... Handle part, 5, 6, 105, 106 ...
Wire, 9,109 ... Throttle lever, 11,1
11 ... Brake release lever, 9c, 11c, 109
c, 111c ... Arm part, 12, 13, 112, 11
3 ... Mounting part, 16, 116 ... Abutting part, 17, 117 ...
Recessed portion, 18, 118 ... Sliding portion, 51 ... Working machine, 5
2 prime mover, 53 ... work implement.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Higashi, Inventor Kenji Higashi 1-4-1, Chuo, Wako-shi, Saitama, Ltd. Inside the Honda R & D Co., Ltd. (56) References Fields investigated (Int.Cl. ⁷ , DB name) A01D 34/68 F02D 11/02

Claims (3)

(57) [Claims] 1. A prime mover attached to one end of an operating rod,
A working machine having a working tool attached to the other end of the operating rod, the operating rod having a brake mechanism for the working tool, in which the operator operates the power of the prime mover. In the operating handle device of the working machine, further comprising a handle portion to be held by a hand for holding the working posture of the working machine, the handle portion including a throttle lever and a brake release lever. On the finger side while being held by the person
A brake for releasing the brake mechanism by an operation in the gripping direction of the palm is provided on the palm side while the throttle lever that is operated by pulling or loosening the finger is provided and is held by the operator of the handle portion. setting the release lever only, wherein the throttle lever and the brake release lever, the
The throttle lever, the brake release lever, and the prime mover
Connected to the throttle mechanism of the machine and the brake mechanism of the work implement.
Attach the arm part that has the attachment part to attach each wire.
S wherein the arm portions are arranged in the handle part, of the arms
An operating handle device for a working machine, wherein the wire attachment portions are arranged so as not to interfere with each other . Wherein a hollow said handle portion, wherein the through respective wires within the handle portion according
Item 1. An operating handle device for a working machine according to Item 1 . 3. An end portion of an arm portion of the throttle lever is provided with an abutting portion that abuts against the brake release lever, and the brake release lever has an abutting portion at an end portion of the arm portion of the throttle lever. 2. The operating handle device for a working machine according to claim 1 , further comprising: a sliding portion that abuts and slides, and a recessed portion that is provided in a portion adjacent to the sliding portion and that the contact portion fits into. .