JPH02307110A - Control lever - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to intermittent operation of working machines such as lawn mowers and υ1 tractors (cludge action between rotary blades or tilling claws and a power source, etc.). and the control lever that controls the operating state settings (such as the height and depth settings of the rotary blade and the υ1 moving claw) via a rod or wire.

L Prior Art] Fig. 4 shows a lawn mower called a rugger for mowing the side edges of a lawn. Set the rotary blade 50 at the lower front at an appropriate height, drive it to rotate with the engine 40, grasp the handle grip 21, and push the machine lO.
The rotary blade 50 cuts the grass or its roots on and under the ground.

In the same figure, the reference numeral 23L indicates the intermittent rotation of the rotary blade 5G (
This is a control lever for setting the height of the rotary blade 50. Rod 2 is attached to lever 23L.
5 are connected to each other, and this rod 25 is further connected to a rotary blade support mechanism 30 as shown in FIG. The support mechanism 30 rotatably holds the support shaft 51 of the rotary blade 50 at the tip of the support rod 31, and the support rod 3 is compressed and inserted into the swing arm 33 with a spring 32 interposed. It is. The swing arm 33 is attached to the fuselage 10 (
It is formed integrally with a swing lever 34 pivotally mounted to the frame 20 (see FIG. 4), and the swing lever 34 is urged upward in the figure by a return spring 35 and is connected to the rod 25 at the bottom. There is. Further, a transmission belt 42 is wound between the driving pulley 4L on the engine 40 side and the driven pulley 52 attached to the support 51. When the swing arm 33 is at the imaginary line position on either side of the figure, the belt 42 becomes loose and the drive pulley 41 idles, but when the swing arm 33 is rotated to the solid line position, the driven pulley 52 (support shaft 51 ) is drive pulley 4
1, the belt 42 is stretched, and the driving force is transmitted to the driven pulley 52 (and therefore the rotary blade 50).

Swing arm 3: (Since the spring 32 is interposed between the support rod 31 and the support rod 31, the above driving force can be transmitted by slightly changing the rotational position of the swing arm 33 and adjusting the height of the rotary blade 50. The swing arm 33 is integrated with the swing lever 34, and the swing lever 34 is pulled by the rod 25 to determine its rotational position, so by operating the control lever 23L in FIG. , on/off of the driving force to the rotary blade 50 (clutch action) and setting of the height of the rotary blade 50 are performed.

In the lawn mower shown in FIG. 4, when the operator interrupts work for a short time, the handle grip
After letting go of the robot, the user operates the control lever 23L to stop the rotation of the rotary blade 50, and then leaves the aircraft IO. In other words, when the operator releases his/her hand, the rotary blade 50 automatically
It is impossible to automatically release the clutch (belt engagement), such as stopping the clutch. Similar to this lawn mower, the lawn mower disclosed in Japanese Patent Application Laid-Open No. 62-236406 is not equipped with a mechanism for automatic clutch release.

Recently, lever 24L as shown in Fig. 6 has been used as a control lever to enable automatic clutch release of lawn mowers, grass cutters, etc.
is publicly known. This lever 24L is provided, for example, in a lawn mower as shown in FIG.
The rod for setting the height of is the second lever 12, and this is
As shown in the figure, it is attached to the first lever 11 which can be grasped together with the handle grip 21.

In order to set the height of the rotary blade 50, a bracket lie is provided integrally with the first lever 11 and has a plurality of retaining holes 11d that can be engaged with and detached from the bin 12b on the side surface of the second lever 12. By selecting the hole ttd and engaging the bin 12b, the set angle of the second lever 12 with respect to the first lever 11 is changed, and the second lever 12 comes to rotate together with the second lever 12.

The first lever 11 is gripped together with the handle grip 21 [1
t, the second lever I2 rotates to an angle determined by the engagement between the bin 12b and the hole lid and attracts the rod 25, thereby transmitting the driving force to the rotary blade 50 and setting the height of the rotary blade 50. will be done.

According to this control lever 24L, when the operator releases his hand from the handle grip 21 held together with the first lever U,
Due to the action of the return spring 35 (or similar biasing means) shown in FIG. 5, the swing arm 33, rod 25, etc. immediately return to the original position (the position indicated by the imaginary line in FIG. 5), and the rotary blade 50 rises. At the same time, the transmission of driving force to it is interrupted. In other words, in a lawn mower or the like equipped with this control lever 24L, automatic clutch release is possible. Conventionally, the first lever 11 and the second lever 12 of the control lever 24L have been rotatably attached to the frame 20 (body 10) by a common fulcrum 11a, as shown in FIG.

[Problems to be Solved by the Invention] The above-mentioned control lever 24L (Fig. 6) is praised for making it possible to automatically release the clutch of working machines such as lawn mowers, but it does not meet the needs of the operator (operator). It cannot be said that sufficient measures have been taken to reduce the burden on grip strength and reduce fatigue. It is from the fulcrum 11a to the connecting point 25a of the rod 25.
This is because although the distance from the fulcrum 11a to the gripping portion 11b of the first lever 11 is made larger than the distance from the fulcrum 11a to the gripping portion 11b of the first lever 11, and the required gripping force is reduced based on the lever principle, the following two points are inadequate.

(2) The grip force required for a long period of time during work is not designed to be smaller than the operating force required for a short period of time to drive the rotary blade 50 (Figs. 4 and 5) at the start of work. The first lever l is connected from the rod 25 via the second lever 12.
The load moment acting on l is the lever length from the fulcrum 11a to the rod 25, that is, from the fulcrum 11a to the rod 25.
For example, if the second lever 12 is set at the position of the imaginary line in FIG. The force is maximum when the grip is held as shown in the figure. During work, hold the grip portion 1 of this first lever 11.
Since it is necessary to constantly hold 1b and grip 21, if the force (grip strength) required in this gripping state is large, the operator may become fatigued due to long hours of work.

■When the first lever 11 is gripped together with the grip 21, the length of the lever from the fulcrum 11a to the [1st point 25] (above) is the second lever! 2, the load moment varies widely depending on the set angle. This means that the grip force required during work is
2, each time the angle is changed, causing discomfort to the operator.

As a measure to reduce the operating force of the first lever 11, the first lever 1 from the fulcrum 11a to the gripping portion 11b is
1 or the second lever 12.
The lever is separated from the first lever 11 to form a two-stage lever, and both are connected by an intermediate rod (both not shown).
can also be considered.

However, the former is difficult to operate because the rotation distance increases with the length and size of the lever U, and the latter is also difficult to operate because the second lever 12 is far from the hand (near the handle grip 21).

The above-mentioned problems regarding the control lever are not limited to lawn mowers and violet mowers.
This was common in working machines that were used by holding the handle grip.

The purpose of this invention is to enable the automatic clutch release of a working machine, and also to have a compact structure, so that it is possible for the operator (at the workbench) to control the intermittent operation of the machine and to set the operating state at hand. 11. It is an object of the present invention to provide a control lever that can reduce the burden on people as much as possible.

[Means for Solving the Problems] The control lever of the present invention has the control lever shown in FIG. 6 described above. A first lever for rotation, similar to the two pillars of the 21 lever, and a second lever connected to the rad or wire! , III is a control lever, but the attachment fulcrum of the second lever to the first lever is provided on the aircraft body separately from the axis fulcrum of the first lever, and its position is such that the first lever is attached to the handle grip. In the gripped state, a) from the connection point of the rod or wire in the second lever to the pivot point of the first lever, no matter what set angle the second lever is mounted via this mounting fulcrum; (b) When the second lever is attached near the center of the variable setting range, the above rod or wire in the second lever makes an acute angle with the longitudinal direction of the rod or wire. The direction from the connecting point to the mounting fulcrum point is approximately perpendicular to the longitudinal direction of the rod or wire.

[Function] The control lever of the present invention first consists of the control lever 24 in FIG.
Similar to L, it has the following effect.

b) When the first lever is rotated, the second lever is also rotated, and a predetermined displacement is given to the rod or wire connected to it, thereby intermittent operation of the work machine and setting of the operating state. . The displacement m of the rod or wire when the first lever is gripped by the handle grip, that is, the operating state of the working machine, can be arbitrarily determined by the set angle of the second lever.

)1) When the operator releases his/her hand from the handle grip, the first and second levers return to the position of the rod or wire and can stop the operation of the working machine, so the machine's automatic clutch release is disabled. enable.

8) The second lever is mounted on the first lever, making it compact, and both levers are provided near the handle grip, allowing for hand operation.

Furthermore, the control lever of the present invention has the following characteristic functions.

2) Handle grip force (Lkt force), that is, the force required to continuously operate the working machine, is calculated from the force required for a short time to pull the first lever toward the handle grip at the start of machine operation. Let's reduce the size and explain the above [issue] (2).

This is based on point a) of ``biped [means]'', so the position of the mounting fulcrum of the second lever that is 4 degrees relative to the first lever is Ll + t I' when the first lever is on the handle grip. +
This is because the position is set such that the direction from the connection point of the first rod or wire to the pivot point of the first lever makes an acute angle with the longitudinal direction of the rod or wire.

When a lever that uses a lever is used to pull a rod or wire connected to it, the angle between the direction from the connection point to the pivot point of the lever and the direction of the rod or wire gradually decreases, but the rod or wire The load moment acting on the lever from the wire is maximum when the perpendicular line drawn from the pivot point of the lever to the rod or wire becomes the longest, that is, when the above angle becomes 90°, and after that, the angle decreases as the angle becomes more acute. (sine value of) decreases as and. Therefore, as mentioned above, if the above-mentioned angle is an acute angle when the first lever is grasped together with the handle grip, the force required in that grasping state is the force required to operate the first lever in that state. The value is smaller than the required force (minimum value).

N) The force required to hold the first lever between the handle grip and the handlebar grip is made almost constant regardless of the set angle of the second lever, thereby solving [Problem] (2).

This is in addition to b) of the above-mentioned [means], and the position of the mounting fulcrum of the second lever is set so that the second lever is near the center of the set angle range and the first lever handle grip is This is because when the rod or wire is held up, it is positioned either in the direction from the connecting point of the rod or wire toward the attachment fulcrum, or in a position that is approximately perpendicular to the longitudinal direction of the rod or wire.

In other words, if the above conditions are not met, if the setting angle of the second lever is changed, the perpendicular line drawn from the above-mentioned mounting fulcrum to the rod or wire with the first lever held by the grip and the pole. The change in length becomes smaller. In the gripping state described above, the positional relationship between this mounting fulcrum and the shaft fulcrum of the first lever is constant, so the force for changing the length of the perpendicular line (a small one means that the vertical line from the shaft fulcrum of the i-th lever to the rod or wire is This indicates that only the length of the vertical line changes.Since the length of this perpendicular line is the lever length of the load moment acting from the Cl put or wire, the above means that this negative Y
:j moment will be kept almost constant.

[Embodiment] FIGS. 1 and 2 are a side view and a plan view (a view taken along the line ■-■ in FIG. 1) of a control lever 12 according to an embodiment of the present invention, respectively. This control lever L is provided near the handle grip 21 of a lawn mower similar to that shown in FIG. A rod 25 is connected to the lever lever, and this rod 25 is further connected to the rotary blade support mechanism 30 as shown in FIG. The height of the rotary blade 50 can be set intermittently.

In FIG. 1, the symbol l indicates the bolt
A first lever, reference numeral 2, is rotatably supported on a shaft fulcrum 1a made of a nut or the like, and is attached to the first lever via an attachment fulcrum 2a.
The second lever is connected to the second lever. A plurality of (
Here, it is a bracket with a 7g) engagement hole 1d! 1c is formed integrally with the lever I, and a pin 2b that can be engaged with any one of the holes 1d is protruded from the side surface of the lever 2, and a bolt is used as the mounting fulcrum 2a of the lever 2.
In addition to the nut, a hinge ring 2a' shown in FIG. 2 is interposed.

As shown in FIG. 1, the first lever ■ is moved from the position where the grip portion 1b is away from the handle grip 21 (the position shown by the imaginary line).
It rotates around the pivot point 1a to the position where it is held together with the grip 21 (the position indicated by the solid line) during work with the lawn mower.
If the hole 1d is selected for the integrated bracket Ic and the bottle 2b is engaged, the second lever 2 will rotate to the angular position corresponding to the hole 1d with respect to the levers L and B. A displacement is applied to the rod 25. The reason why a spring 2a' (Fig. 2) is inserted at the mounting fulcrum 2a is that it urges the lever 2 and the pin 2b moves into the engagement hole 1d of the lever 1.
so that it fits into hole I (1 (therefore, lever 2)
This is because when changing the setting angle of the lever 2, it is sufficient to operate the lever 2 against the biasing force. In addition, a
The lever 1 is formed to have an appropriate length so that the force that rotates the first lever 1 against the force applied as a load to the lever 25 is as small as possible due to the lever principle. The point 25a is provided close to the mounting fulcrum 2a and the shaft fulcrum 1a.

The feature of this control lever L is that the second lever
The mounting fulcrum 2a of the lever 2 is connected to the second frame 20.
This is provided separately from the pivot point 1a of the lever 2. And the position of the mounting fulcrum 2a is a lever! The position is such that the following two conditions are satisfied when the handle grip 21 is held by the handlebar grip 21 and the handlebar grip 21. That is, a) the direction from the connection point 25a of the rod 25 on the second lever 2 to the pivot point 1a of the second lever 2;
The angle α between the lever 2 and the longitudinal direction of the lever 2 is an acute angle no matter which set angle the lever 2 is attached to (that is, which hole 1d it engages with). b) The angle β between the direction from the connection point 25a to the mounting fulcrum 2a and the longitudinal direction of the rod 25 is a second
When lever 2 is placed near the center of the setting angle variable range (for example, 7
There are two reasons: when the screw is attached (by engaging with the center one of the engaging holes 1d), the height becomes 9G''.

By satisfying the condition a), handle grip 2
The force required when the first lever 1 is gripped between 1 and 1 is smaller than the force required when operating (rotating) the lever 1 to that OiI, and the condition b) is also satisfied. As a result, the force required in the gripping state described above is approximately constant regardless of the set angle of the second lever 2. These points will be explained below using FIG. 3.

Since FIG. 3 schematically depicts the control lever L, the same reference numerals as in FIGS. 1 and 2 are given to parts corresponding to each structure. Angles α and α in this figure.

and β, β° also correspond to the above-mentioned angles α and β.

12w, QoSQ', Q'o, and Q''W all represent the length of the perpendicular line drawn from the shaft fulcrum 1a to the rod 25 (lever length), of which 12w, (!'v, 12'w are the second lever length), respectively. The above length when the second lever 2 is gripped together with the handle grip 21 when the lever 2 is attached at both ends and the center of the variable setting angle range, Q
o and Q'o respectively refer to the state in which the lever 1 is released when the lever 2 is at both ends of the above range. Further, F is a force acting as a load from the rod 25 to the connection point 25a.

The load moment acting on the control lever L is the product of the above-mentioned lever length and the force F, and the force required to operate the lever L against it, i.e. the gripping portion 1 of the first lever 1
The force that draws b toward the grip 21 is the moment divided by the distance from the pivot point 1a to the gripping portion 1b.

Condition a) above means that the angle α in the figure is an acute angle no matter what angle the lever 2 is at, that is, even the largest α° is an acute angle (approximately 30° here). In order for the condition to be satisfied, the lever length (1ws, (1'*) when lever 1 is gripped by grips 21 and 6 is smaller than the lever length QoSQ"o before gripping, as shown in the figure. Becomes shorter.

The load moment increases or decreases depending on the length of these levers, so as mentioned above, the grip 21 and the first lever! The necessary force is applied while grasping the lever, but before that, operate lever 1 (
This means that the force required for rotation is still smaller than that required for rotation.

On the other hand, the condition b) is that the angle β when the lever 2 is near the center of the set angle range, that is, the angle β° is
The angle should be approximately 90°. Since this condition is satisfied, the lever length related to the load moment in the grasping state is changed from g'w (or (!w) to 12' as shown in the figure).
It changes only in a narrow range up to v. This means that the force required in the gripping state is approximately constant regardless of the set angle of the lever 2, as described above.

The control lever L for the rotary blade of a lawn mower has been introduced above as an embodiment of the present invention, but the present invention is not limited to this; however, the present invention is not limited to this, and the present invention is not limited to this. It can be widely applied as a control device via a For example, there is a control lever that controls the intermittent operation of the υ toe in a tiller (clutch lever between the engine and the engine) and a control lever that sets the depth of the tiller to 11 in the soil, or a clutch lever in various power transmission means. It can be used as a control lever that also functions as a gear shift lever.

[Effects of the Invention] The control lever of the present invention enables automatic clutch release of a working machine, is compactly constructed, enables hand-operated operation of both the intermittent operation of the machine and the setting of the operating state, and has the following points. This makes it possible to reduce the burden on the grip force of the operator (operator) and the resulting fatigue.

l) The force when gripping the lever (first lever) together with the handle grip, ie the force required during continuous operation of the working machine, is minimized.

2) The force required in step 1) above is approximately constant regardless of the set angle of the second lever.

[Brief explanation of the drawing]

Figures 1 to 3 relate to embodiments of this invention.
Figure 1 is a side view of the control lever, Figure 2 is from ■-■ in Figure 1.
3 is a schematic diagram corresponding to FIG. 1 of the same control lever. Fig. 4 is an overall perspective view of a lawn mower equipped with a conventional control lever, Fig. 5 is a side view of the rotary blade support mechanism of the lawn mower, and Fig. 6 is a side view of another conventional control lever. be. ! ,...control lever, 1st...th! Lever, la...
・Axis fulcrum, 11)...111f Samurai part, 2...Second lever, 2a...Mounting fulcrum, 20...Frame, 21
... Handle grip, 25... Rod, 30... Rotating blade support mechanism, 50... Rotating blade.

Claims (1)

[Claims] In order to control, via a rod or wire, the interruption of operation and the setting of the operating state of a working machine that is handled by gripping the handle grip, the machine is rotatably supported on the body of the machine. Consisting of a first lever that is held together with the handle grip during operation, and a second lever that is attached to the first lever so that its angle can be changed and rotated together with the first lever, and that is connected to the rod or wire mentioned above. The control lever is provided with a fulcrum for attaching the second lever to the first lever separately from an axial fulcrum of the first lever to the aircraft body, and the position thereof is set to the first lever.
With the lever gripped together with the handle grip, a) from the point of connection of the rod or wire on the second lever to the point of connection of the rod or wire on the second lever, no matter which of the above-mentioned set angles the second lever is mounted via this mounting fulcrum; If the direction toward the pivot point of the first lever makes an acute angle with the longitudinal direction of the rod or wire, and b) the second lever is installed near the center of the variable setting angle range, A control lever characterized in that the direction from the connection point of the rod or wire to the mounting fulcrum is approximately perpendicular to the longitudinal direction of the rod or wire.