JPH0237353Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pipe joint for detachably connecting pipes.

[Conventional technology]

Pipe joints for connecting pipes often use balls or claws as a means of connecting and fixing pipes. For example, balls or claws are provided on the cylindrical body that makes up the pipe joint, and these are attached in a centripetal direction using a sleeve or the like. It uses a structure in which balls and claws are pressed into contact with the outer circumferential surface of the pipe inserted into the cylindrical body. According to such fixing means using balls or claws, the balls or claws make point contact with the outer circumferential surface of the pipe, which increases surface pressure and may damage the outer circumferential surface of the pipe, especially if the pipe is made of aluminum. If the ball was made of steel or copper, it was necessary to be very careful when operating the ball or claw.

[Problem that the invention attempts to solve]

As mentioned above, traditional pipe fittings for pipe connections are
The outer circumferential surface of the pipe is fixed with balls or claws, so if used to connect aluminum or copper pipes, it will damage the outer circumferential surface, and if the fixing force is weakened, the pipe will not be fixed sufficiently. A number of problems arose.

In view of the above-mentioned problems, this invention aims to prevent pipe damage and secure fixation by increasing the contact area with the outer circumferential surface of the pipe, and also to provide a pipe joint that enables auto-locking. be.

[Means for solving problems]

In order to achieve the above object, this invention constitutes the main body of a pipe joint with an outer cylinder body and an inner cylinder body whose relative positions do not change, and the inner cylinder body and the inner cylinder body into which a pipe is inserted from the front. A sliding body that is urged forward by compressed air is airtightly fitted between an outer cylinder located on the outside, and a pipe is allowed to be inserted inward at the front of the outer cylinder. An annular protrusion having a hole concentric with the inner cylinder and having a predetermined gap in the axial direction between it and the front end of the inner cylinder is provided, and in this gap, a pipe pressure contact surface is formed on the inner surface of the annular protrusion. An annular chuck having a tapered surface that becomes smaller in diameter toward the front and divided into three or more parts in the axial direction is positioned at the front and rear parts, respectively, and the front part of the chuck is connected to the annular protrusion and the rear part is connected to the inner cylinder. The chuck is supported at the front end of the body so as to be expandable and narrow in the centrifugal direction, and furthermore, the large diameter portion of the rear end of the chuck can come into contact with the front surface of the sliding body, and a chuck is provided between the chuck and the annular protrusion. It has a structure with a spring that biases it backwards.

[Effect]

When the pipe is disconnected, the chuck moves rearward due to the spring provided between the annular protrusion and the chuck, and the chuck moves backward so that its tapered surface touches the front end of the inner cylindrical body. The chuck slides and moves backward while expanding in the centrifugal direction using the tapered surface as a guide, and at this time, the sliding body is pushed back by the large diameter portion of the rear end of the retreating chuck. In this state, when a pipe is inserted into the inner cylinder and compressed air is also introduced between the outer cylinder and the inner cylinder to push the sliding body forward, the sliding body resists the elastic force of the spring. move forward and move the chuck forward. As the chuck moves forward in this way, the tapered surface formed on its front end comes into contact with the annular protrusion, and this tapered surface acts as a guide and narrows in the centripetal direction, and the pipe pressure contact surface formed on the inner surface of the chuck contacts the annular projection. Press it against the outer circumferential surface of the previously inserted pipe to fix the pipe. When the pressurizing action of compressed air on the sliding body is stopped,
The chuck is pressed rearward by the spring and expands while retreating, releasing the pressing force against the outer circumferential surface of the pipe.

〔Example〕

This invention will be described in detail below based on embodiments shown in the drawings, but this invention is not limited to the embodiments.

In the drawings, 1 is an outer cylinder, and 2 is an inner cylinder that is fitted into the outer cylinder 1 so that the relative position between the outer cylinders 1 does not change. A certain pipe 3 can be inserted. 4 is a sliding body that is airtightly fitted between the outer cylindrical body 1 and the inner cylindrical body 2, and is slidable in the axial direction. Compressed air can be introduced into the air passage 5 and is urged forward by this compressed air. Reference numeral 6 denotes an air supply/discharge port opened in the outer cylindrical body 1, and communicates with the air passage 5. 7 is a sealing material.

The front part of the outer cylinder body 1 allows insertion of at least the pipe 3 toward the inside, and the inner cylinder body 2
An annular protrusion 10 having a hole 8 concentric with the inner cylindrical body 2 and having a predetermined gap 9 in the axial direction is provided between the inner cylindrical body 2 and the front end thereof. Reference numeral 11 denotes an annular chuck located in the gap 9, and this annular chuck 11 has a pipe pressure contact surface 12 on its inner surface, and taper surfaces 13 whose diameter becomes smaller toward the front at its front and rear parts, respectively. , 14 are formed and divided into four in the axial direction. Also, this check 11
, whose front tapered surface 13 is connected to the annular protrusion 1
0, rear tapered surfaces 14 are slidably supported on the front end of the inner cylinder body 2, and the chuck 1
When the chuck 1 moves forward, the tapered surface 13 comes into contact with the annular protrusion, and the tapered surface 13 acts as a guide and narrows in the centripetal direction, and when the chuck 11 retreats,
A tapered surface 14 contacts the front end of the inner cylinder 2, and the tapered surface 14 serves as a guide to expand in the centrifugal direction. 15 is a tapered surface formed on the annular protrusion 10, and is in sliding contact with the tapered surface 13 of the chuck 11. 16 is a tapered surface formed at the front end of the inner cylindrical body 2;
It comes into sliding contact with the tapered surface 14 of. Further, the large diameter portion of the rear end of the chuck 11 can come into contact with the front portion of the sliding body 4. A compression spring 17 is provided between the annular projection 10 and the chuck 11, and the chuck 11 is biased rearward by the elastic force of the spring 17.

Note that 18 is a sliding tube fitted into the inner cylinder 2, and this sliding tube 18 is urged forward by a spring 19.

Reference numeral 20 denotes a sealing material provided on the front surface of the sliding tube 18, so that the end surface of the pipe 3 inserted into the inner cylinder 2 comes into contact with the sealing material 20. 21 is a sealing material.

Next, the operation of the above embodiment will be explained. pipe 3
When the chuck 11 is not connected, the chuck 11 moves rearward due to the elastic force of the spring 17, and at this time,
The chuck 11 has a tapered surface 1 formed at the rear.
4 is a tapered surface 16 formed at the front end of the inner cylindrical body 2.
The sliding body 4 slides and retreats while expanding in the centrifugal direction with the tapered surface 14 acting as a guide, and the sliding body 4 whose front surface abuts the large diameter portion of the rear end of the chuck 11 is pressed by this chuck 11 and retreats. . In this state, insert the tip of the pipe 3 into the inner cylinder 2,
The end of the pipe 3 is brought into contact with the sealing material 20 provided on the front surface of the sliding tube 18 for sealing, and the air supply and
A compressed air passage is supplied from the discharge port 6 to the air passage 5. Due to the pressing action of the compressed air, the sliding body 4 moves forward against the elastic force of the spring 17, thereby moving the chuck 11 forward. The chuck 11 that has moved forward in this way has a tapered surface 13 formed on its front portion that is connected to a tapered surface 1 formed on the annular protrusion 10.
5, the tapered surface 13 acts as a guide and narrows in the centripetal direction, and the pipe pressure contact surface 12 formed on the inner surface of the chuck 11 comes into pressure contact with the outer peripheral surface of the inserted pipe 3, thereby fixing the pipe 3.

In such a connected state, compressed air is passed through the air path 5.
When the chuck 11 is removed from the spring 17
It is pushed backward and expands while retreating, and the pressing force, that is, the fixing force on the pipe 3 is released.

[Effects of the invention] As described above, according to this invention, the pressure contact area of the pipe inserted into the inner cylindrical body is increased by means of a chuck, which reduces the surface pressure of the chuck that presses the pipe. Moreover, it can be fixed securely. Therefore, there is no possibility of damaging the pipes when connecting the pipes, making it ideal as a pipe joint for connecting soft pipes that are particularly susceptible to damage. Furthermore, since the present invention can fix and release the pipe by supplying and exhausting air, it does not require a large force to connect and fix the pipe, and the pipe can be easily released by remote control. .

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal side view showing an embodiment of this invention, Fig. 2 is a partially longitudinal side view showing the state in which the pipes are connected, Fig. 3 is a partially longitudinal enlarged side view showing the chuck, FIG. 4 is a front view of FIG. 3. 1... Outer cylindrical body, 2... Inner cylindrical body, 3... Pipe,
4...Sliding body, 8...Hole, 9...Gap, 10...
Annular protrusion, 11...chuck, 12...pipe pressure contact surface, 13...tapered surface, 14...tapered surface, 17...spring.

Claims (1)

[Scope of utility model registration request] The main body of the pipe joint is composed of an outer cylindrical body and an inner cylindrical body whose relative positions do not change, and between the inner cylindrical body and the outer cylindrical body located outside of the inner cylindrical body, into which a pipe is inserted from the front. , a sliding body urged forward by compressed air is fitted airtightly, and the front part of the outer cylinder body has a hole that allows insertion of a pipe toward the inside and is concentric with the inner cylinder body. In addition, an annular protrusion having a predetermined gap in the axial direction is provided between the inner cylinder and the front end of the inner cylinder, and in this gap, a pipe pressure contact surface is formed on the inner surface, and a pipe is formed in the front and rear portions of the annular protrusion. An annular chuck having a tapered surface with a small diameter and divided into three or more parts in the axial direction is positioned, and the front part of the chuck is expanded and narrowed in the centrifugal direction by the annular protrusion and the rear part by the front end of the inner cylinder. The tube is configured such that the large diameter portion of the rear end of the chuck can come into contact with the front surface of the sliding body, and a spring is provided between the chuck and the annular protrusion to bias the chuck rearward. Fittings.