JPS5830102Y2 - engine operating device - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a control lever system that allows the operator to automatically return the engine from any rotational speed to an idling rotation state or a stopped state by letting go of the handle grip. The purpose is to prevent fatigue during work, especially in the ring finger and little finger that press the safety lever toward the handle grip.

Generally, in a brush cutter, as shown in Fig. 1, an operating rod 3 having an engine 1 at one end and a cutting blade 2 at the other end is hung from the shoulder by a band, and a blade 4 is fixed to the operating rod 3. The operator grasps the grips 5, 5 at both ends with both hands and operates the throttle lever 6 with his fingers while working.

After adjusting the throttle lever 6 to a predetermined opening position, the operator can take his or her finger off the throttle lever 6, and in an emergency such as when the operator falls down, the operator can take his or her hand off the handle grip 5. At the same time, a safety lever 7 (Figs. 2 and 3) is provided so that the throttle lever returns to the idle link or stop position.

In FIGS. 2 and 3, 8 is a lever holder fixed to the handle 4, 9 is a pin attached to the holder 8, and both the throttle lever 6 and the safety lever 7 are supported on the pin 9.

The inner wire 11 in the throttle cable 10 is connected to the throttle lever 6, and when the throttle lever 6 is operated toward the handle grit 5 side toward the arrow A (FIG. 3),
The inner wire 11 is pulled toward the engine speed increasing side against the elasticity of a return spring (not shown) in the carburetor.

One end of the outer cable 12 of the throttle cable 10 is fixed to the holder 8.

A spring 14 is stretched between a spring receiver 13 provided on the holder 8 and the safety bar 7, and the safety lever 7 normally receives a moment in the direction away from the handle grip 5 (in the reverse A direction).
In the free state, it occupies the position shown in Figure 3.

A wave washer-shaped cam 16 centered on the pin 9 is mounted on the opposing surfaces of the boss portions of the throttle lever 6 and the safety lever 7.
17, these cams 16, 17 do not press against each other when the safety lever 7 is in the free state shown in FIG. The cam 17 is held in the idle link (or stop) position shown in FIG. is pressed, the boss portion of the throttle lever 6 is pressed against the disc spring 18, providing resistance to the throttle lever 6, and the throttle lever 6 can be fixed at any position after operation.

However, since the conventional safety lever has a straight shape as shown by the two-dot chain line 7' in FIG. 3, there is a problem in that fingers become fatigued when the lever is grasped together with the handle grip 5 and pressed against the handle grip 5.

In other words, the ring finger and little finger of the right hand are the root side section L□ of the safety lever 7.
is always held toward the handle grip 5 side, but the index finger and middle finger, which should be applied to the tip end section L2, often work together with the thumb to adjust the opening of the throttle lever 6.
A sufficient pressing force cannot be applied to the lever tip side section L2.

For this reason, the ring finger and little finger that hold down the root side section L1 near the pin 9 are likely to be burdened, resulting in noticeable fatigue.

The present invention solves the above conventional problems by
Bend the tip side section L2 in a step-like manner so as to separate it from the handle grip 5 with respect to the section L1 on the base side,
At least part of the index finger and middle finger can apply pressing force to the safety lever 7 at all times during work, and the surface of the section L2 (the surface where the fingers touch) is lower than the surface of the section L1 by the lift L3 (
For example, the distance is 10 mm) from the handle grip 5.

In FIG. 4 showing the situation during work, the worker is holding the safety lever 7 together with the handle grip 5 mainly with the thumb 15a, ring finger 15d, and little finger 15e of the right hand 15.
The tip of the throttle lever 6 is operated by the index finger 15b and middle finger 15c against the aforementioned resistance (such as the elasticity of the disk spring 18).

However, even in this state, the tip side section L of the safety lever 7
2 is separated from the handle grip 5 in a stepped manner,
The base of the index finger 15b and middle finger 15c receives the pressing force toward the handle grip 5 side, and the ring finger 15d and little finger 1
This reduces the burden on 5e.

When the position of the throttle lever 6 is determined according to the working situation, the index finger 15b and the middle finger 15c are released from the throttle lever 6, and the tip side section L2 of the safety lever 7 can be grasped and held toward the handle grip 5 side. The safety lever 7 can be reliably held in pressure contact with the handle grip 5 by applying a slight force to a position away from the handlebar grip 9.

Therefore, the burden on the ring finger 15d and little finger 15e is reduced, and fatigue is also reduced.

In the state shown in FIG. 5, the middle finger 15c is used exclusively for gripping the safety lever 7, and the index finger 15b is used for gripping the safety lever T and adjusting the throttle lever 6 in cooperation with the thumb 15a. .

In this case as well, the safety lever 7 can be gripped by the index finger 15b and the middle finger 15c in the distal section as far away as possible from the pin 9, thereby reducing the burden on the ring finger 15d and little finger 15e.

As explained above, in the present invention, the throttle lever 6 is pivoted to the lever holder 8 fixed to the handle 4 for actuation operation via a pin 9 perpendicular to the handle 4 so as to be rotatable on the side of the handle. Then, the tip of the outer cable 12 of the throttle cable 10 is fixed to the holder 8, and the inner wire 11 is connected to the throttle lever 6. When the tip of the throttle lever 6 is operated toward the handle grip 5, the inner wire 11 is connected to a return spring (not shown). ), the safety lever 7 is pivotally mounted on the pin 9 between the throttle lever 6 and the handle grip 5, and the thumb 15 of the worker's right hand is pulled during work.
a on the tip of the handle grip 5, and the rest of the fingers of the right hand are placed on the safety lever 7 with the little finger 15e occupying the pin 9 side, and only when the safety lever 7 is pressed against the handle grip 5, the throttle lever 6 In an engine operating device designed to stop the engine at any position, when the safety lever 7 is pressed against the handle grip 5 with the little finger 15e, ring finger 15d, middle finger 15c, and index finger 15b of the worker's right hand, the worker's index finger 15b and middle finger 15c Bend the tip section L2 of the safety lever, which is slightly stiff, in a step-like manner to separate it from the handle grip with respect to the section L1 on the base side, and while working, grasp the safety lever 7 together with the handle grip 5 with the little finger 15e1 and the ring finger 15d, and press it wide. The amount of bending of the safety lever tip side section L2 is determined so that the base portions of the index finger 15b and middle finger 15c can apply a pressing force to the safety lever 7 even when the throttle lever 6 is operated with the extended index finger 15b and middle finger 15c. Therefore, in Figure 4, which shows the situation during work, the tip of the throttle lever 6 (right end in the figure) is quite far away from the handle grip 5 (therefore, Figure 4 shows the engine idle link). At this time, the safety lever 7 is held toward the handle grip 5 side by the little finger 15e1 and the ring finger 15d, and the forefinger 15b and middle finger 15c are stretched out.
The tip of the throttle lever 6 is operated in this state, but since the tip section L2 of the safety lever 7 is bent in a step-like manner away from the handle grip 5, the middle finger 15c and index finger Press the root part (midway part) of 15b against the tip side section L2 of the safety lever 7,
A moment can be added to the safety lever 7 toward the handle grip 5 side, so that the little finger 15e and the ring finger 15d
can reduce the burden of

That is, when the safety lever 7 is grasped with only the little finger 15e and the ring finger 15d located close to the pin 9 in order to press the safety lever 7 toward the handle grip 5 side, the pin 9, the little finger 15e, and the ring finger 1 are held close to the pin 9.
Because the distance at 5d1 is short, you have to firmly grasp the safety lever 7 with your little finger 15c1 and your ring finger 15d, but with your middle finger 15c
Since the safety lever 7 can be pressed toward the handle grip 5 side by the base of the first index finger 15b, even if the pressing force is small, the point of application of the pressing force on the safety lever 7 is sufficiently far away from the pin 9. Therefore, the base portions of the middle finger 15c and the index finger 15b act effectively in holding the safety lever 7 in the working position device shown in FIG.

At this point, the section L2 on the tip side of the safety lever is defined by the two-dot chain line 7 in FIG.
In the case of a button with a conventional structure in which it is connected in a straight line with the root section L1 as shown in Figure 4, the little finger 15e1 ring finger 15d
, hold the safety lever (7' in Figure 3) towards the handle grip 5 side, and extend your index finger 15b and middle finger 1.
5c, when the throttle lever 6 is operated, the tip side section L2 of the safety lever 7' is already...
Because they are in close contact with the surface of the index finger 15b and middle finger 15c,
It is not possible to press the tip end section L2 of the safety lever 7' toward the handle grip 5 at the base, and in order to hold the safety lever 7' in the working position, the little finger 15e located close to the pin 9, The burden is only on the ring finger 15d, and the little finger 15
e. Since the point of action of the ring finger 15d on the safety lever 7' is close to the pin 9, a large force is required, which increases the burden on the little finger 15e and the ring finger 15d, making them easily fatigued.

FIG. 5 shows a high-speed operation state in which the tip of the throttle lever 6 approaches the handle grip 5. At this time, in addition to the little finger 15e1 and the ring finger 15d, the middle finger 15c also moves the safety lever 7 toward the handle grip 5. Since the middle finger 15c is gripping the safety lever 7, the tip side section of the safety lever 7 is bent away from the handle grip 5, and the middle finger 15c strongly hits the tip side section of the safety lever 7, causing the middle finger 15c to It is also advantageous that the point of action on the safety lever 7 is sufficiently far away from the pin 9, and the safety lever 7 can be held in the working position shown in FIG. 5 by simply grasping the safety lever 7 with a light force using the middle finger 15c. This reduces the burden on the little finger 15e and ring finger 15d.

Moreover, since the root of the index finger 15b that operates the tip of the throttle lever 6 also applies a pressing force to the tip section of the safety lever 7, its point of action is farthest from the pin 9, so the root of the index finger 15b The pressing force is also very effective in holding the safety lever 7 in the working position shown in FIG.

Therefore, the burden on the little finger 15e, ring finger 15d, and middle finger 15c can be further reduced.

In this regard, if the safety lever I is a straight type (conventional type) as shown by the two-dot chain line 7' in FIG. Even if you hold it toward the handle grip 5 side, you have to apply a lot of force to the little finger 15e and ring finger 15d on the pin 9 side in order to press the safety lever 7' against the handle grip 5, and the little finger 15e1 ring finger 15d burden increases.

That is, much force cannot be distributed to the finger on the side away from the pin 9 (for example, the middle finger 15c).

Furthermore, when holding the safety lever 7' of the conventional structure as shown in FIG. 5, it is impossible to press the tip end section of the safety lever 7' with the base of the index finger 15b.
The burden on the little finger 15e, ring finger 15d, and middle finger 15c increases.

As described above, according to the present invention, by only slightly changing the shape of the safety lever 7, the safety lever 7 can be adjusted while the throttle lever 6 is being adjusted.
Even when gripping the safety lever 7 together with the handle grip 5 with all fingers, the pressing force from the middle finger 15c and index finger 15b that presses against the distal end section L2 away from the pin 9, which is the fulcrum of the safety lever 7, is effectively applied. It may not work.

That is, even if the safety lever 7 is pushed toward the handle grip 5 side with a slight force by the middle finger 1501 and the index finger 15b, a large moment is applied to the safety lever 7 toward the handle grip 5 side because the point of action is separated by a light distance from the pin 9. This allows the safety lever 7 to be easily brought into the working position shown in FIG. 4, which is effective in reducing fatigue.

When embodying the present invention, it is not necessary to bend the safety lever 7 itself as shown in the embodiment drawings, as long as the surface of the safety lever 7 that the finger touches is bent in a stepped manner.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a brush cutter to which the present invention is applied, Fig. 2 is a view of the handle grip section in the direction of arrow A, and Fig. 3 is a - - of Fig. 2.
(2) A side view in the direction of arrows, and FIGS. 4 and 5 are perspective views showing working conditions. 5... Handle grip, 7... Safety lever, 15b... Index finger, 15c...
・Middle finger, Ll... Root side section, L2...
・Tip side section, L3... Lift.

Claims (1)

[Scope of utility model registration request] The throttle lever is pivoted to the lever holder fixed to the handle for operating the work equipment via a pin perpendicular to the handle so that it can rotate freely on the side of the handle, and the outer cable end of the throttle cable is fixed to the holder. Then, connect the inner wire 11 to the throttle lever so that when the tip of the throttle lever is operated toward the handle grip side, the inner wire is pulled toward the engine speed increasing side against the elasticity of the return spring. Pivotly attach the safety lever on the above pin between the handle grips,
When working, place the thumb of the worker's right hand on the tip of the handle grip, and place the remaining fingers of the right hand on the safety lever with the little finger occupying the pin side.
In an engine operating device that allows the throttle lever to stop at a desired position only when the throttle lever is pressed against the steering wheel grip, when the safety lever is pressed against the steering wheel grip with the little finger, ring finger, middle finger, and index finger of the worker's right hand. Bend the tip section of the safety lever, where the worker's index and middle fingers rest, against the section at the base of it in a step-like manner so as to separate it from the handle grip, and while working, grasp the safety lever with the little finger and ring finger along with the handle grip. An engine characterized in that the amount of bending of the tip side section of the safety lever is determined so that the root portions of the index and middle fingers can apply pressing force to the safety lever even when the throttle lever is operated with the extended index and middle fingers. Operating device.