JPH0518486Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention allows arm members or link members to be tilted freely relative to each other via a universal joint, and to maintain a desired tilt angle. The present invention relates to a joint device that can be held fixed.

(Prior Art) Conventionally, joint devices generally have a configuration in which arm members and the like are connected via a universal joint so that they can mutually tilt freely.

(Problems to be Solved by the Invention) However, in the conventional configuration, since the length of the arm member is constant, there is a problem that the arm member may be bent significantly into an unstable shape.

[Structure of the invention] (Means for solving the problems) In view of the conventional problems as mentioned above, the present invention has the following features:
A joint device in which a first fluid pressure cylinder and a second fluid pressure cylinder are connected via a universal joint device, and the spherical portion provided on the first fluid pressure cylinder side is connected to the second fluid pressure cylinder side. The first, hemispherical recess is rotatably engaged with the hemispherical recess, and is fixedly provided by supplying a working fluid to a fluid chamber between the spherical part and the hemispherical recess. An on-off valve is provided in a flow path connecting one fluid pressure chamber and the other fluid pressure chamber in each second fluid pressure cylinder.

(Example) FIG. 1 shows a universal joint device 1 used in a joint device according to the present invention. This universal joint device 1 includes, for example, a shaft-shaped first member 3 and a second member 5.
A spherical part 7 is provided at one end of the first member 3.

An engaging portion 9 for engaging the spherical portion 7 is provided at one end of the second member 5 .

The engaging part 9 includes a receiver 13 having a hemispherical recess 11 that receives about half of the spherical part 7, and the receiver 13.
and an annular detachment prevention member 17 that is integrally attached to the spherical section 7 by a threaded section 15 and prevents the spherical section 7 from detaching from the hemispherical recessed section 11.
A fluid chamber 19 having a small gap is formed between the surfaces facing the hemispherical recess 11.

On the surface of the hemispherical recess 11 facing the spherical part 7,
A fluid supply/discharge port 21 is formed for supplying and discharging a working fluid such as pressure oil or compressed air to and from the fluid chamber 19 .

An O-ring 23 that prevents the working fluid supplied to the fluid chamber 19 from leaking is provided on the inner peripheral surface of the open end of the hemispherical recess 11 so as to be in close contact with the spherical part 7 .

In the above configuration, after the first member 3 and the second member 5 are tilted relative to each other to adjust the desired angle in a state where the working fluid is not supplied to the fluid chamber 19, the fluid supply/discharge port 21 is opened. When the working fluid is supplied to the fluid chamber 19, the spherical portion 7 is firmly pressed against the inner circumferential surface 17a of the detachment prevention member 17.

The rotation of the spherical part 7 is restrained by the pressure, and the mutual tilting angle of the first member 3 and the second member 5 can be fixed and maintained at a desired tilting angle.

When the working fluid is discharged from the fluid supply/discharge port 21, the spherical part 7 is no longer pressed by the detachment prevention member 17, and the fixed holding is released.

In the above embodiment, the fluid supply/discharge port 21 is formed in the hemispherical recess 11, but it is formed on the surface of the spherical part 7 facing the hemispherical recess 11 (imaginary line in FIG. 1).
You may do so.

FIG. 2 shows a universal joint device 25 of another embodiment,
The same members as those of the universal joint device 1 of the embodiment shown in FIG. 1 will be described with the same reference numerals.

In the receiver 13, a cup-shaped restraining body 27 made of metal with a large coefficient of friction that can be brought into close contact with the spherical part 7 by elastic deformation is attached between the spherical part 7 and the hemispherical recessed part 11. It is provided so as to approach and separate from 7.

A fluid chamber 29 having a small gap is formed between the opposing surfaces of the restraining body 27 and the hemispherical recess 11.

An O-ring 31 is provided on the outer periphery of the open end of the restraint body 27 so as to be in close contact with the inner circumferential surface of the open end of the hemispherical recess 11 to prevent leakage of working fluid.

In such a structure, when the working fluid is supplied to the fluid chamber 29 from the fluid supply/discharge port 21, the restraining body 27 is elastically deformed by the working fluid to reduce its diameter and comes into close contact with the spherical part 7. Separation prevention member 1
7 on the inner surface 17a.

Due to this close contact action and the pressing action, the rotation of the spherical part 7 is restrained, and the mutual tilting angle of the first member 3 and the second member 5 can be fixed and maintained at a desired tilting angle. can.

FIG. 3 shows a joint device using the universal joint device, and in this embodiment, for example,
An operating unit 33 for operating the NC machine tool is suspended from a main body 35 of the NC machine tool, and is illustrated as a link mechanism device 37 that can be fixed at any position in space.

Between the NC machine tool body 35 and the telescopically adjustable first fluid pressure cylinder 39a, between the first fluid pressure cylinder 39a and the second fluid pressure cylinder 39b, and between the second fluid pressure cylinder 39a and the second fluid pressure cylinder 39b.
Between the fluid pressure cylinder 39b and the operating section 33,
First, second and third universal joint devices 1a and 1, respectively.
b, 1c.

First, second, third universal joint devices 1a, 1b,
1c has the same structure as the universal joint device 1 shown in FIG. This corresponds to member 5, respectively.

First and second fluid pressure cylinders 39a, 39b
Since they have the same structure, only the structure of the first fluid pressure cylinder 39a will be explained. A piston 43 is provided in the cylinder 41 of the first fluid pressure cylinder 39a.
and the piston 43 is connected to the first universal joint device 1a.
A spring 45 is provided for biasing toward.
One fluid pressure chamber and the other fluid pressure chamber partitioned on both sides of the piston 43 are connected by a flow path 47, and an on-off valve 49 provided in this flow path 47 allows the two fluid chambers to be opened. They are connected and cut off.

In the above configuration, each universal joint device 1a, 1
After making the parts b and 1c freely tiltable and opening the on-off valve 49, the operator manually moves the operating part 33 to a desired position in the space. Then, the piston 43 is pulled or pushed and moves inside the cylinder 41, and the fluid in one fluid pressure chamber side of the piston 43 passes through the flow path 47 and the on-off valve 49 to reduce the fluid pressure in the other fluid pressure chamber. Flows into the chamber side. Thereby, the fluid pressure cylinders 39a, 39b are expanded and contracted. Further, the universal joint devices 1a, 1b, and 1c are tilted.

After moving the operating section 33 and determining the position in this way, the universal joint device 1
a, 1b, 1c, the tilting of the universal joint devices 1a, 1b, 1c is restrained, and the on-off valve 49 is closed, after which the operating portion 33 is held fixed at the determined position. I can do it.

The on-off valve 49 may be any on-off valve that can freely shut off the flow of the working fluid, such as a valve that is opened and closed manually or a solenoid valve that is automatically opened and closed by remote control. .

As can be understood from the above description of the embodiments, the present invention is based on the first fluid pressure cylinder 3.
9a and the second fluid pressure cylinder 39b are connected via a universal joint device, and the first
The spherical part 7 provided on the side of the second fluid pressure cylinder 39a is rotatably engaged with the hemispherical recess 11 provided on the side of the second fluid pressure cylinder 39b, and the spherical part 7 and the hemispherical recess are provided. The first and second fluid pressure cylinders 39a, 39b are fixedly provided by supplying working fluid to the fluid chamber 19 between the first and second fluid pressure cylinders 39a, 39b.
An on-off valve 49 is provided in a flow path 47 connecting one fluid pressure chamber and the other fluid pressure chamber.

As is clear from the above configuration, the joint device according to the present invention is formed by connecting the first and second expandable hydraulic cylinders 39a and 39b via a universal joint, and the universal joint is rotatable. It is flexible and fixed. Each of the first and second fluid pressure cylinders 39a and 39b has an on-off valve 49 provided in a flow path 47 connecting one fluid pressure chamber and the other fluid pressure chamber.

Therefore, according to the present invention, by opening the on-off valve 49, the expansion and contraction of the fluid pressure cylinders 39a, 39b can be adjusted, and by closing the on-off valve 49, the adjusted length of the fluid cylinders 39a, 39b can be adjusted. It can be fixed to

That is, according to the present invention, the first fluid pressure cylinder 39a and the second fluid pressure cylinder 39b connected via a rotatable and fixable universal joint can be adjusted and fixed at any angle, and the first fluid pressure cylinder 39a and the second fluid pressure cylinder 39b can be fixed at any angle. The first and second fluid pressure cylinders 39a and 39b can be adjusted to any desired length and fixed.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a universal joint device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of a universal joint device according to another embodiment of the present invention, and Fig. 3 is an example of the use of the universal joint device of the present invention. This is a link mechanism device shown. 1, 25... Universal joint device, 7... Spherical part, 1
DESCRIPTION OF SYMBOLS 1...Semispherical recess, 39a, 39b...Fluid pressure cylinder, 47...Flow path, 49...Opening/closing valve.

Claims (1)

[Scope of utility model registration request] A joint device is formed by connecting a first fluid pressure cylinder 39a and a second fluid pressure cylinder 39b via a universal joint device, and the first fluid pressure cylinder 39
The spherical part 7 provided on the a side is connected to the second fluid pressure cylinder 3.
The spherical part 7 and the hemispherical recess 1 are provided rotatably engaged with the hemispherical recess 11 provided on the 9b side.
1, and connects one fluid pressure chamber and the other fluid pressure chamber in each of the first and second fluid pressure cylinders 39a, 39b. A joint device characterized in that an on-off valve 49 is provided in a flow path 47.