JP2000215760A - Control switch of remote control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability and controllability of a control switch of a remote control device for remotely controlling a working machine. SOLUTION: A control switch is composed of a pair of tact switches 35, 36, and an elastic body (plate spring 33) having an energizing force stronger than a spring resetting force of the tact switches is interposed between the switch control part of a control lever 30 and working elements of the pair of the tact switches 35, 36, to thereby enlarge a reserved control stroke of the control lever 30 from the state where the tact switch 35 or 36 is turned to the ON state by the maximum control of the control lever 30 to the state where the tact switch 35 or 36 is turned to the OFF state by the reset control of the control lever 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation switch of a remote control device configured to remotely control various actuators for driving a working machine.

[0002]

2. Description of the Related Art Some working machines such as on-board cranes use an operation signal generator called a radio control or a remote control.
A configuration is used in which various actuators for driving the working machine can be remotely controlled from a remote place.

As shown in FIG. 4, an operation signal generator 1, which is an operation unit of a remote control device of this kind, has a plurality of operation switches 2a, 2b, 2c, 2d provided on an operation panel 1a, and a back portion provided on the back. A common speed control lever 3 is provided. In order to remotely control a working machine using the operation signal generator 1, first, an actuator to be driven by operating the plurality of operation switches 2a, 2b, 2c, 2d (when the working machine is a vehicle-mounted crane, , A swing motor 4 for swinging the telescopic boom 3, a hoisting cylinder 5 for driving the telescopic boom 3, a winch motor 7 for driving the hook 6 up and down, and a telescopic cylinder 8 for telescopically driving the telescopic boom 3, and the driving direction thereof. Then, by remotely pulling the speed control lever 3 and instructing the drive speed of the selected actuator, remote control is performed.

In the conventional operation signal generator 1, a lever-operated potentiometer is generally used as the speed control lever 3, and the operation switches 2a, 2b, 2
As c and 2d, two-way operation type toggle switches as shown in FIG. 5 are used.

[0005]

However, a toggle switch generally has a low switch durability (mechanical durability) of about 50,000 times, and generates an operation signal which is used for a long time in a severe environment such as vibration. The operation switch of the vessel lacked reliability. Therefore, the operation switch is changed to a highly durable tact switch (generally, the mechanical durability of the tact switch is about 5 million times), and the tact switch is operated by a tilting operation lever. It is conceivable to improve the durability of the device, but in such a configuration, the following problem has occurred. That is, when the operation amount of the operation lever is slightly decreased due to a slip of a finger or the like while the operation machine is being operated by operating the operation lever, the switch is turned on even though the operator is not conscious at all. There was a problem that the work machine was turned off and the work machine stopped. This is because the operation stroke of the tact switch is extremely short (generally, the operation stroke of the tact switch is about 0.2 mm), and the switch is turned off by only slightly reducing the operation amount of the operation lever. For this reason, it is necessary to operate the operation lever with a strong force beforehand so that the switch does not turn off even if the operation amount of the operation lever is slightly reduced, which causes a problem of poor operability. Was.

In view of the above-described conventional problems, the present invention sets a large operation stroke of the operation lever from when the switch is turned on to the time when the operation lever is returned to the state where the switch is turned off. It is an object of the present invention to provide an operation switch of a remote control device with improved operability.

[0007]

The present invention employs the following configuration as specific means for solving the above-mentioned problems. In other words, the operation switch is turned on / off by a bidirectional swing operation of the operation lever, and the operation switch of a remote operation device configured to be capable of remotely operating a work machine with an operation signal from the operation switch is intended. .

The operation switch is constituted by a pair of tact switches having a short operation stroke, and a force greater than a spring return force of the tact switch is provided between a switch operating portion of the operation lever and an operating member of the pair of tact switches. The extra operation stroke of the operation lever from the state where the tact switch is turned on by operating the operation lever to the maximum and the operation lever is returned to the state where the tact switch is turned off is increased by interposing an elastic body having power. It is characterized by.

With this configuration, a tact switch having high durability can be used as an operation switch, and the durability of the switch can be greatly improved as compared with a switch using a conventional toggle switch. You can.

The operating force of the operating lever is transmitted to the pair of tact switches via an elastic body that is set so that the biasing force is greater than the spring return force of the tact switch. Then, the tact switch is first turned on, and remote operation can be performed with the same operational feeling as a conventional operation switch.

On the other hand, after the tact switch is operated by the operation of the operation lever, the elastic body interposed between the switch operation portion of the operation lever and the operating members of the pair of tact switches is deformed, so that the operation is continued. The lever can be operated. For this reason, in this operation region, an urging force equal to or more than the OFF operation force of the tact switch is accumulated in the elastic body due to the operation of the operation lever, and even if the operation amount of the operation lever is slightly reduced for some reason, the elastic body accumulates in the elastic body. The ON operation of the tact switch is continued by the applied urging force. Therefore, it is not necessary to always operate the operation lever with a strong force so that the switch is not turned off, and the operability of the operation switch can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An operation switch of a remote control device according to an embodiment of the present invention will be described below with reference to FIGS.

First, the configuration of the operation signal generator 1 will be described with reference to FIG. 2 by taking a radio control transmitter generally used for a vehicle-mounted crane as an example. 1a is an operation panel. The operation panel 1a is composed of upper and lower three stages,
In the lower stage, the turning operation switch 10 for driving the turning motor 4, the undulating operation switch 11 for driving and operating the undulating cylinder 5, the winch operation switch 12 for driving and operating the winch motor 7, and the driving of the telescopic cylinder 8 are sequentially operated from the left. A telescopic operation switch 13 is provided. These operation switches 10, 11, 12, 13 are used for selecting the actuators 4, 5, 7, 8 to be driven and the driving direction thereof.

On the upper part of the operation panel 1a, in order from the right, a power switch 15, a display 16 for displaying the operating state of the working machine (for example, the load factor of the working machine, the suspended load, etc.), and the display 16 Is provided with a display changeover switch 17 for switching the display contents of the above. In the middle of the operation panel 1a, a height regulating switch 18 for regulating the working height of the telescopic boom 3 from exceeding a predetermined height, a horn switch 19 for sounding an alarm sound (horn), and a hook 6 are arranged in order from the left. A hook retracting switch 20 for automatically retracting and a slow speed switch 21 for driving the working machine at a slow speed are provided.

On the back side of the operation signal generator 1,
A common speed control lever 22 is provided. The speed control lever 22 is used for instructing the drive speed of the actuators 4, 5, 7, 8 selected by the operation switches 10, 11, 12, 13.

The operation switches 10, 11, 12, and 13 are configured as shown in FIG. That is, reference numeral 30 denotes an operation lever formed in an inverted T shape. The operation lever 30 is
Swing shaft provided on panel member 31 constituting operation panel surface 1a
32 is pivotally supported by the operating unit 30.
By operating a, swinging operation can be performed in the a direction and the b direction. A leaf spring 33 having an elongated shape and having switch pressing portions 33a and 33b at both ends is attached to a switch operating portion 30b located below the operating lever 30 by screws 34 or the like. The leaf spring 33 corresponds to the elastic body in claim 1 of the present application, and its urging force is set to be greater than the spring return force of the tact switches 35 and 36 described later. The leaf spring 33 is
In another embodiment, as shown in FIG. 3, a pair of coil springs 37, 37 provided on both sides of the operation lever 30 can be used. Further, instead of the coil springs 37, 37, an elastic body (not shown) such as sponge rubber may be used.

A pair of tact switches constituting a switch
The switches 35 and 36 are mounted on a switch mounting board 38 disposed close to the panel member 31 so as to have a positional relationship corresponding to the switch pressing portions 33a and 33b of the leaf spring 33. 39a
, 39b are tact switches 35, 36 of the panel member 31.
Is a through hole formed at a position corresponding to
Switch pressing pieces 40a and 40b are inserted in 39a and 39b. The switch pressing pieces 40a and 40b function as operation force transmitting members when transmitting the operation force of the operation lever 30 to the pair of tact switches 35 and 36 via the leaf spring 33.

Each of the operation switches 10, 11, 12, and 13 is configured as described above. When the operation lever 30 is operated in the direction a (position a1), the operation force changes the leaf spring 33 and the switch pressing piece 40a. Is transmitted to the actuating member 35a of the tact switch 35, and the tact switch 35 is turned on.
Is operated in the direction b (position b1), the operating force is
3, transmitted to the operating member 36a of the tact switch 36 via the switch pressing piece 40b, so that the tact switch 36 is turned on. For this reason, in these two operation regions, the tact switch 35 or 36 is first turned on by the operation of the operation lever 30, so that remote control can be performed with the same operational feeling as a conventional switch.

On the other hand, if the operation lever 30 is further operated in the direction a (from the position a1 to the position a2), the tactile switch 35 remains on and the leaf spring 33 bends to continuously operate the operation lever 30. Can be operated (see a chain line diagram in FIG. 1). Further, the operating lever 30 is further moved to b
When operated in the direction (between position b1 and position b2)
Also, the operation lever 30 can be continuously operated by bending the leaf spring 33 while the tact switch 36 is kept on. For this reason, in these two operation regions, the tactile switch 35,
Even if an urging force equal to or greater than the off-operation force of 36 is accumulated, and the operation amount of the operation lever 30 is slightly reduced, the on-operation of the tact switch 35 or 36 is continued by the urging force accumulated in the leaf spring 33. is there. For this reason, tact switch
This eliminates the need to always operate the operation lever 30 with a strong force so that the 35 and 36 do not turn off, thereby improving the operability of the operation switch.

In FIG. 1, reference numeral 41 denotes a waterproof cover which covers the periphery of the operation lever 30 to prevent rainwater or the like from entering the operation signal generator 1 from the operation lever 30. It is a waterproof sheet for preventing rainwater or the like from entering the signal generator 1.

[0021]

According to the operation switch of the remote control device of the present invention, since the operation switch is constituted by a pair of tact switches, the durability of the operation switch can be greatly improved. An elastic body having an urging force greater than the spring return force of the tact switch is interposed between the actuating members of the tact switch. Since the extra operation stroke was increased, the operability of the operation switch could be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of an operation switch of a remote control device of the present invention.

FIG. 2 is an explanatory diagram of an operation signal generator equipped with the operation switch of the present invention.

FIG. 3 is an explanatory diagram of a second embodiment of the operation switch of the present invention.

FIG. 4 is an explanatory diagram of a conventional remote control device.

FIG. 5 is an explanatory diagram of a conventional operation switch.

[Explanation of symbols]

1; operation signal generator; 1a; operation panel; 3; telescopic boom; 4; swivel motor; 5; undulating cylinder; 6; hook, 7; winch motor;
0: turning operation switch, 11; undulating operation switch, 12;
Winch operation switch, 13; Telescopic operation switch, 22;
Speed control lever, 30: Operation lever, 32; Swing axis, 3
3; leaf spring, 35, 36; tact switch, 35a, 36a;
Operating member, 37; coil spring, 38; switch mounting board, 39a, 39b; through hole, 40a, 40b; switch pressing piece,

Claims (1)

[Claims] An operation switch of a remote operation device configured so that an operation switch is turned on and off by a bidirectional swing operation of an operation lever and an operation signal from the operation switch allows a work machine to be remotely operated. The operation switch includes a pair of tact switches having a short operation stroke, and an elastic force having a biasing force greater than a spring return force of the tact switch between the switch operating portion of the operation lever and the operating member of the pair of tact switches. With a body interposed, a marginal operation stroke of the operation lever from the state where the tact switch is turned on by maximally operating the operation lever and the state where the tact switch is turned off by returning the operation lever to a state where the tact switch is turned off is characterized in that Operation switch of the remote control device.