JPS5838806B2 - sousasouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating device for working machines such as brush cutters and tea cutters.

In this type of work machine, throttle operation is performed by operating a lever attached to the grip, and a control mechanism is provided on the driven side of the automatic centrifugal clutch, and when this control mechanism is released, the automatic centrifugal Power is transmitted to driven parts such as the cutting blade through the clutch, and the control mechanism is released by operating a lever attached to the grip.

Therefore, in the event of an accident such as falling while working, simply release the lever and the throttle will return to idling.
The braking device automatically resets and applies braking force to the driven side, reducing or cutting off power transmission to dangerous parts such as the blade, and stopping the machine by braking, thereby ensuring safety.

However, in addition to releasing the lever, the immediate reaction of the worker is to strongly pull the lever toward the grip side, which causes the throttle operating force to increase at that moment and speed up the engine. Moreover, the brake on the driven side is released, and dangerous parts such as the blade are driven, which is extremely dangerous.

This invention allows the throttle to be released and returned to idling in response to either release or strong pull of the lever on the grip, or automatic control of the control mechanism on the driven side. The object is to provide an improved operating device around the lever that can return the lever, avoid danger, and enable safe work.

The present invention will be specifically explained below based on the illustrated embodiment applied to a brush cutter (here, the structure of the operating device will be explained regarding the control device for the driven side of the automatic centrifugal clutch; (Of course, the present invention can also be applied to an operation mechanism for changing the throttle from idling to high speed rotation.)

In the figure, reference numeral A denotes an operating rod having a gear housing B at one end, and a drive shaft B1 protruding from the gear housing B has a disc-serrated blade C attached thereto.

That is, a cap-shaped braking element B2 is wedged on the drive shaft B1 by a key B5, and this braking element B2
Fit the blade C above, apply the holding washer B3, and tighten the nut B.
It is tightened at 4.

Further, a clutch case D of a centrifugal clutch is provided at the other end of the operating rod A, and is connected to the housing of the prime mover E.

The centrifugal clutch automatically becomes connected when the rotational speed of the prime mover E exceeds a predetermined value, and becomes disengaged when it decreases.

The driven side of this centrifugal clutch includes a transmission shaft passing through the operating rod A.

Power is then transmitted to the drive shaft B1 and the blade C via this transmission shaft.

The clutch case D is provided with a hanging fitting F, and by hanging a belt on this hanging fitting F, the brush cutter is held on the shoulder by the operator.

Further, a handle G is attached to the middle of the operating rod A, and its right grip H is attached with a throttle lever mechanism J, and its left grip K is attached with a brake lever mechanism. .

The throttle lever mechanism J is connected to the throttle valve of the prime mover E via a throttle wire M, and the brake lever mechanism is connected to a braking mechanism P installed in the gear case B via a brake wire N. .

The braking mechanism P includes a braking body 1 having an arc-shaped brake shoe 2 pressed against the outer periphery of a braking element B2, and this braking body 1 is pivotally supported on a pivot shaft 5.

A cover 4 surrounding the gear housing B is fastened to the gear housing B by bolts and nuts 3, and a compression coil spring 6 is disposed between the inner wall surface of the cover 4 and the brake body 1.
Accordingly, the brake shoe 2 is pressed against the braking element B2.

Further, the brake wire N is connected to its outer tube N.
1 is fixed to the cover 4, and its inner tube N2 is fixed to the brake body 1.

Both the throttle lever mechanism J and the brake lever mechanism are constructed as shown in FIGS. 5 to 7.

Here, the brake lever mechanism will be explained.

The lever holder 7 is a housing whose front and upper sides are open, and houses a lower part of a lever 8, an interlocking tool 9, and a U-shaped bullet 10 inside.

A protrusion 7b having a groove 7a formed by notching 7 is protruded from the lower surface of the holder 7, and the end of the outer tube N1 of the brake wire N is fixed to this protrusion 7b.

In addition, a pivot hole 7c is provided in the center of the side surface of the holder 7, and a hole 7e is provided in the rear portion of the side surface for mounting close to the rear wall 7d.
Each is drilled.

The lever 8 has a longitudinally long long hole 8a bored in its lower part, a notch 8b in the lower front part, and a long upper part extending upward.

The interlocking tool 9 has a U-shaped cross section with its rear portion cut out, and a pin hole 9a is bored in the front side of the cut portion, and a pivot hole 9b is bored in the rear side of the cut portion. 11 is inserted, and the remaining portion is provided with a groove 9c, into which the end of the inner cable N2 of the brake wire N is locked.

Fitting the lower part of the lever 8 into the cut out part of the interlocking tool 9,
After locking the notch 8b with the pin 11, the pivot shaft 12 is inserted into the pivot holes 7c and 9b of the holder 7 and the interlocking tool 9, and the long hole 8a of the lever 8, and the lever 8 and the interlocking tool 9 are connected. However, the nut 13 is screwed to such an extent that it can be rotated about the pivot shaft 12.

Furthermore, the band Q passed through the attachment hole 7e of the holder 7 is wrapped around the handle G, and when the tensioner R is tightened and the brake lever mechanism is attached to the handle G, one side 10a of the bullet 10 is tightened. Band Q and rear wall 7 of holder 7
d, and the other side 10b is brought into contact with the lower part of the lever 8, and the lower part of the lever 8 is urged toward the pin 11 side implanted in the interlocking tool 9, and the notch of the lever 8 is pressed. 8b is pin 11
Make sure that it does not come off carelessly.

With such a configuration, when the prime mover E is stopped or idling, neither the lever of the throttle lever mechanism J nor the lever of the brake lever mechanism is pulled toward the grip side, and the respective speed regulators attached to the carburetor Due to the return spring (not shown) of the valve and the elasticity of the spring 6,
It is in a state where it has been pulled back to the left end in FIG.

At this time, the braking device P operates as shown in FIGS.
As seen in the figure, the brake shoe 2 is connected to the braking element B2.
The action of the spring 6 is applied to the brake body 1 so that it comes into pressure contact with the outer periphery of the brake body 1.
is giving to

During work, the lever 8 of the brake lever mechanism should be moved until the upper end of the lever comes into contact with the left grip K (indicated by the two-dot chain line in FIG. 5, and shown in the state shown in FIG. 6). The interlocking tool 9 is rotated about the pivot shaft 12 while the notch 8b at the bottom of the lever 8 is locked to the pin 11 of the lever.

During this operation process, the inner wire N2 resists the spring 6.
is pulled, the shoe 2 gradually reduces the pressure contact force against the braking element B2, and the brake is released.

On the other hand, the lever of the throttle lever mechanism J is rotated from the left end position in FIG. 5 to the position shown by the two-dot chain line.
During this time, throttle control is performed and speed regulating control is performed.

Next, the operation when the lever 8 is pulled toward the left grip beyond the above-mentioned brake release area will be explained.

When the lever 8 is in the position shown by the two-dot chain line in FIG. 5, the lower part of the lever 8 is biased to the left in the figure by the U-shaped projectile 10 as shown in FIG. Push the lever 8 towards the left grip.

Then, the lever 8 is brought into contact with its upper grip.
The pin 11 is rotated counterclockwise in the figure within the range of the elongated hole 8a, and the pin 11 is thereby removed from the notch 8b, resulting in the state shown in FIG.

For this reason, the inner wire N2, which has been pulled against the spring 6, is released from its pulling force and returns, causing the shoe 2 to come into pressure contact with the braking element B2 again, thereby applying the control to the driven side of the centrifugal clutch. regain power.

Regarding the throttle lever mechanism J, this can be explained by the fact that when the notch 8b is released from the pin 11, the throttle operating force is released and the engine returns to idling.

As a result, the centrifugal clutch becomes in a low speed state, cutting off power transmission.

Of course, if the operating force on the lever 8 is released (if you release your hand), the lever 8 will return to its original position due to the action of the spring 6.
It will be in idling and braking state.

In this way, if you have an accident such as falling while working,
If you immediately release your hand from the lever 8 or pull the lever 8 strongly toward the grip side, the throttle will be released or the driven side of the centrifugal clutch (in this example,
Since the braking is applied to the cutting blade part), even if the blade body C touches the body, no one will be injured, and safety is ensured.

In this embodiment, a long hole 8a is made in the lever 8, a pivot shaft 12 is inserted into the long hole 8a, and a spring 10 is used to elastically support the lever 8 in the direction of separating it from the grip. 8b and the pin 11, but in short, when the lever is pulled beyond the throttle control area or brake release operation area, the control mechanism is disconnected from the control mechanism. Of course, any structure may be used as long as the mechanism can automatically return to its original state.

Further, in this embodiment, the throttle lever mechanism has the same structure as the brake lever mechanism, but either one of them may have the structure of the operating device as described above.

Further, the brake lever mechanism may include a switch that short-circuits the electric circuit of the prime mover when the brake lever mechanism exceeds the brake release area.

In addition, a mechanism that determines the priority order is interposed between the throttle lever and the brake lever so that the operation of the throttle lever mechanism system is restricted while the brake lever system is in operation, and a rotary centrifugal clutch of the prime mover is provided. The signal may not be transmitted to the driven side via.

As described in detail above, the present invention operates a control mechanism in the process of rotating and pulling a lever attached to a grip toward the grip, and the above invention is such that the control mechanism is automatically returned when the operating force on the lever is released. In addition to configuring the control mechanism, the lever is equipped with a disengagement mechanism that pulls the lever toward the grip side, disconnects the lever from the control mechanism, and returns the control mechanism to coarse movement. When working on work equipment with other types of blades, in the event of an accident such as a fall, the throttle can be released by letting go of the lever or, conversely, by pulling it firmly toward the grip, or the centrifugal clutch can be activated. Can brake the side,
This has the practical effect of being able to stop the blade, preventing serious injury to the worker or his attendants, and maintaining safety.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view showing one embodiment of the present invention;
3 is a sectional view taken along line 1-1 of FIG. 2, FIG. 4 is an exploded perspective view of the lever device, and FIGS. 5 to 7 are explanatory diagrams of the operation. A...operation rod, B...gear housing, B1...drive shaft,
B2...Control element, B3...Pressure washer, B4...
Nut, B5...Key, C...Blade body, D...Clutch case, E...Motor, F...Hanging bracket, G...
・Handle, H...grip, J...throttle lever mechanism [K...grip, L...) v--t-lever mechanism, M...throttle wire, N...brake wire, N1...Outer tube, N2...Inner wire, P...Brake & Q...Band, R...
Tightening tool, 1...brake body, 2...brake shoe, 3...bolt/nut, 4...cover, 5...
Pivot, 6... Spring, 7... Lever holder, 7a.
...Groove, 7b...Protrusion, 7c...Pivot L7d...
Rear wall, 7e... Mounting hole, 8... Lever, 8a...
・Long hole, 8b...notch, 9...interlocking tool, 9a...
Sen hole, 9b... Pivot, 9c... Groove, 10... Bullet, 10a...-side, 10b... Other side, 1... Pin, 12... Pivot shaft , 13...Natsuto.

Claims (1)

[Claims] 1. In a device that operates a control mechanism in the process of rotating and pulling a lever attached to the grip toward the grip, the control mechanism is configured so that it automatically returns when the operating force on the lever is released, and the lever is attached to the grip. The operating device is characterized in that the lever is provided with a link release mechanism so that when the lever is pulled to the side beyond the control item area, the lever is disconnected from the control mechanism and the control mechanism automatically returns.