JPH0436081Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to an electric joystick that controls the output voltage according to the tilt angle of the operating lever.

(Prior Art) The conventional electric joystick shown in FIG. 2 has an operating lever 3 rotatably attached to the ceiling plate 2 of a case 1, and a rocker arm 4 provided below the operating lever 3.

The case 1 is provided with four guide members 5, and a plunger 6 is slidably inserted into each of these guide members 5. Then, the lower end of this plunger 6 is connected to the guide member 5.
The spring receiver 7 is made to protrude slightly downward, and the spring receiver 7 is fitted to the protruding end. A spring 9 is interposed between the spring receiver 7 and the bottom plate 8 provided at the lower end of the case 1, and the spring force of the spring 9 causes the upper end of the plunger 6 to protrude above the guide member 5. There is.

As described above, the plunger 6 that projects above the guide member 5 has its projecting end pressed against the rocker arm 4. Therefore, the spring force of the spring 9 is applied to the rocker arm 4 via the plunger 6.
The operating force of the spring 9 maintains the operating lever 3 in the neutral position shown, that is, in the upright position.

The shoulder portion 5a of the guide member 5 also functions as a stopper. That is,
When the operating lever 3 is tilted to the maximum, the rocker arm 4 comes into contact with the shoulder portion 5a, so that the operating lever 3 is prevented from rotating at this contact position.

The same number of potentiometers 10 as the plungers are provided below the plunger 6, and a spring 12 is applied to the push rod 11 of the potentiometer 10 so that the upper end of the push rod 11 is brought into contact with the lower end of the plunger 6. There is.

When the operating lever 3 is tilted in a predetermined direction, the plunger 6 located in the tilting direction is pushed by the rocker arm 4 and moves against the spring 9. If the plunger 6 moves downward,
Since the plunger 6 pushes the push rod 11, the push rod 11 also moves against the spring 12.

If the push rod 11 of the potentiometer 10 moves as described above, the push rod 1
A voltage corresponding to the amount of movement of 1 is output from this potentiometer 10. The maximum output at this time is determined according to the tilt angle of the operating lever 3,
As described above, the maximum tilt angle is regulated at the position where the rocker arm 4 abuts against the shoulder portion 5a of the guide member 5.

Therefore, by connecting a solenoid of a solenoid valve (not shown) to this potentiometer 10, the solenoid valve can be controlled within the range of the tilt angle of the operating lever 3.

(Problems to be Solved by the Present Invention) In the conventional electric joystick as described above, the rocker arm 4 is brought into contact with the shoulder portion 5a of the guide member 5 to regulate the tilting angle of the operating lever 3. Therefore, the rocker arm 4 contacts a limited portion of the shoulder portion 5a intensively. Therefore, stress concentrates on the contact portion of the shoulder portion 5a, causing wear or deformation of that portion. When the shoulder portion 5a is worn or deformed in this manner, there is a problem in that the maximum tilt angle of the operating lever 3 changes during the course of its use.

Furthermore, the maximum tilting angle of the operating lever 3 is likely to be influenced by the assembly accuracy of the guide member 5, and furthermore, the assembly accuracy becomes extremely inconsistent when assembly errors of other members are accumulated. There was also this problem.

(Means for Solving Problems) This invention is based on the following configuration of the electric joystick and is concerned with its improvement.

In other words, the premise of this invention is that by tilting the operating lever, a plunger facing the rocker arm is pressed, and a potentiometer is arranged in series with the plunger. This is an electric joystick that presses the push rod of a potentiometer with the plunger and outputs a voltage according to the amount of pressure.

Based on the above configuration, this invention includes a spring receiver provided on the lower side of the plunger,
It is fixed to the bottom plate of the body and includes a cylindrical stopper facing the spring receiver, and a coil spring fitted on the outside of the cylindrical stopper. It is characterized by a structure that restricts the maximum tilt angle of the operating lever.

(Function of the present invention) This invention is constructed as described above, so that when the operating lever is tilted and the plunger is pushed, the spring retainer provided on the plunger engages with the cylindrical stopper at the maximum tilt angle position. Contact. In other words,
According to this invention, the linearly moving spring receiver comes into contact with the cylindrical stopper facing it, so that the contact portions between the two come into surface contact.

(Effects of the Present Invention) According to the electric joystick of the present invention, the spring receiver and the stopper are in surface contact, so that the contact portion is not unevenly worn or deformed.

Furthermore, since this stopper is directly fixed to the bottom plate of the body, there is no possibility that the stopper will become misaligned due to accumulation of assembly errors.

Furthermore, since the stopper is cylindrical, the entire circumference of the spring receiver contacts the cylindrical stopper. Therefore, when the spring receiver is in contact with the stopper, the spring receiver and the plunger will not tilt.

Moreover, since the coil spring is fitted to the outside of the stopper, the coil spring is restricted by the stopper and does not shift.

(Embodiment of the present invention) The body 13 of the embodiment shown in FIG.
5 are integrally formed. A connecting member 16 is fixed to this pedestal 15, and a rocker arm 18 having an operating lever 17 fixed to this connecting member is rotatably connected.

A plurality of guide protrusions 19 integral with the body 13 are formed around the pedestal 15, and a sleeve 20 is fitted onto the guide protrusions 19. The upper end of this sleeve 20 is opened on the surface of the guide protrusion 19, and the lower end is opened on the surface of the guide protrusion 19.
It is opened in a recess 21 formed in 3.

A plunger 22 is slidably inserted into the sleeve 20 constructed as described above, with the upper end of the plunger 22 protruding toward the rocker arm 18 and the lower end protruding into the recess 21. A spring receiver 2 is provided at the protruding end within this recess 21.
3 is fitted.

Further, a bottom plate 24 is fixed to the lower end of the body 13, and an insertion hole 25 corresponding to the recess 21 is formed in the bottom plate 24. However, the diameter of the insertion hole 25 is made smaller than the inner diameter of the recess 21 so that the edge portion of the insertion hole 25 protrudes more inward than the opening of the recess 21.

A flange portion 27 formed at the lower end of the cylindrical stopper 26 is fixed to the edge portion protruding inside the bottom plate 24, and a flange portion 27 formed at the lower end of the cylindrical stopper 26 is disposed between the flange portion 27 and the spring receiver 23 fitted to the plunger 22. ,
A coil spring 28 is interposed. In other words, the coil spring 28 is fitted on the outside of the cylindrical stopper 26.

The spring force of the coil spring 28 is applied to the rocker arm 18 via the plunger 22.
The operating force of the spring 28 maintains the operating lever 17 in the neutral position shown in the figure, that is, in the upright state, and its function is exactly the same as that of the conventional one.

The same number of potentiometers 29 as the plungers are provided below the plunger 22, and the push rods 30 of the potentiometers 29 are located within the stopper 26.

Note that this push rod 30 is normally maintained at the illustrated position, that is, a position where the tip of the push rod 30 slightly protrudes beyond the stopper 26 by the action of a spring (not shown).

Thus, when the operating lever 17 is tilted in a predetermined direction, the plunger 2 located in the tilted direction
2 is pushed by the Rocker arm 18, and the spring 2
Move against 8. When the plunger 22 moves downward, the plunger 22 pushes the push rod 30, so that the push rod 30 also moves against a spring (not shown).

When the push rod 30 of the potentiometer 29 moves as described above, the push rod 30 of the potentiometer 29 moves as described above.
A voltage corresponding to the amount of movement of 0 is output from this potentiometer 29. The maximum output at this time is determined according to the tilt angle of the operating lever 17, and the maximum tilt angle is regulated at the position where the spring receiver 23 contacts the stopper. In other words, the rocker arm 18 is
The spring receiver 23 is made to contact the upper end of the stopper 26 before it hits the stopper 9.

As described above, according to this embodiment, the spring receiver 23 as a spring receiver moves linearly and comes into surface contact with the tip of the stopper 26, so that the stress acting on the stopper 26 is dispersed. Therefore,
This stopper 26 will not be deformed.

Further, since the spring receiver 23 and the stopper 26 are in surface contact, the contact portion is not unevenly worn or deformed.

Furthermore, since the stopper 26 is directly fixed to the bottom plate 24 of the body 13, the stopper will not be misaligned due to accumulation of assembly errors.

Furthermore, since the stopper 26 is cylindrical, the entire circumference of the spring receiver 23 comes into contact with the cylindrical stopper 26. Therefore, when the spring receiver is in contact with the stopper, the spring receiver and the plunger will not tilt.

Moreover, since the coil spring 28 is fitted on the outside of this stopper, this coil spring will not shift.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention, and FIG. 2 is a sectional view showing a conventional electric joystick. 13...Body, 17...Operation lever, 18...
...Rotzker arm, 22...Plunger, 23...
... Spring receiver, 24 ... Bottom plate, 26 ... Stopper, 29 ... Potentiometer, 28 ... Coil spring, 30 ... Push rod.

Claims (1)

[Scope of utility model registration request] By tilting the operating lever rotatably attached to the upper surface of the body, a plunger facing the rocker arm provided on the operating lever is pressed, and a potentiometer is connected to the plunger. In an electric joystick that is arranged in series and that presses the push rod of this potentiometer with the plunger and outputs a voltage according to the amount of pressure, it is fixed to a spring catch provided on the underside of the plunger and to the bottom plate of the body. , a cylindrical stopper facing the spring holder, and a coil spring fitted on the outside of the cylindrical stopper, and the maximum tilting angle of the operating lever is determined by the facing distance between the spring holder and the stopper when in neutral. Electric joystick configured to regulate