JPS6339507Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of pipe joints for plastic and rubber, and more specifically, in pipe joints that allow the pipe bodies to be easily attached and detached, the connected pipe bodies can be freely rotated without compromising airtightness. This relates to a pipe joint that can be moved.

In recent years, pipes made of plastic or rubber have been used to transport fluids instead of conventional copper pipes or processed steel pipes due to their weight, flexibility, chemical resistance, etc. Various pipe fittings for connection have been developed. Among these, pipe joints that have a structure that allows pipe bodies to be easily attached and detached without the use of tools are widely used in various types of equipment because they are easy to handle. Their basic structure consists of a joint body, a seal ring that maintains airtightness, a fixing means for connecting and fixing the inserted tube, and an opening means for removing it.
Several methods have been proposed for fixing means and releasing means.

By the way, general characteristics required of pipe joints include airtightness, pull-out strength, repeatability, etc., but in addition to these, the connected pipe bodies must be able to rotate freely without compromising airtightness. is also an important matter. For example, when piping is connected to a moving part, the pipe body is often subject to repeated torsional loads, so if the pipe body remains fixed,
Airtightness deteriorates due to the flattening of the pipe, and if the torsional load is large, the pipe surface is damaged, and parts related to the fixing means inside the pipe joint are deformed and broken. That is, the torsional load applied to the pipe promotes a decrease in repeatability or performance of the pipe and the pipe joint. In addition, pipe bodies often become twisted during piping, and if left twisted, performance will similarly deteriorate.

However, conventional pipe joints have the disadvantage that due to their structure, the connected pipe bodies cannot be rotated without reducing the airtightness. For example, Jikko 57-
No. 20947 discloses a locking body having a plurality of locking claws that prevents the movement of a tube inserted into the joint body in the pulling direction by biting its tip into the outer wall surface of the tube. There is a description of a pipe joint that is arranged to abut against the end edge of the pipe body insertion side of a cylindrical elastic sleeve (also serving as a seal ring) made of rubber or the like arranged inside the sleeve. In this case, the locking body that bites into the outer peripheral surface of the tube and grips it is held between the tapered edge of the elastic sleeve and the joint body, which causes friction and prevents smooth rotation. Therefore, although it is possible to rotate the piping to correct twisting, it cannot be used as a rotating part that is subject to repeated torsional loads. In addition, Utility Model Application Publication No. 58-20787 has a different structure in which a collar having a surface inclined radially outward with respect to the axis of the tube insertion hole is provided inside the end of the fitting body on the tube insertion port side. The tube is held against the collar, and has an edge portion that bites into and grips the outer peripheral surface of the tube body at the inner tip portion, and furthermore, the edge portion is pressed inward in cooperation with the inner inclined surface of the collar. A pipe fitting is described in which a clamping member, preferably with an outwardly inclined surface, is arranged such that it can be moved axially within said collar. However, even in such a structure, during connection, the inclined surface of the tightening member is brought into close contact with the inclined surface of the collar due to back pressure, so that the tubular body does not rotate.

This invention was devised to eliminate the above-mentioned drawbacks of conventional pipe joints, and its purpose is to ensure that the connection part rotates smoothly when the connected pipe body receives a torsional load. To provide a pipe joint that can always maintain a normal connection state even when connected to a movable part or twisted during piping by making the twist state easily correctable. be.

That is, in a pipe joint that allows the pipe body to be easily attached and detached, the annular base of the gripper is made of an elastic metal material and has a plurality of claws on the inner peripheral edge side of the annular base that bite into the outer circumferential surface of the pipe body and grip the pipe body. , because it is held by loosely fitting into the annular gap formed between the step in the joint body and the end face of the push ring, so when in use, only the annular base of the gripping tool is attached to the joint body or the end face of the push ring. Although there is a possibility of contact with the push ring,
Since the claw pieces do not come into contact with anything other than the tube body, there is extremely little friction during rotation. Therefore, the gripper can smoothly rotate while gripping the tubular body. This rotation quickly releases the torsional load and maintains a normal state at all times. Therefore, there is no deformation or damage of the tube and the gripping tool due to torsional loads, and as a result, it is possible to prevent deterioration of usage characteristics such as airtightness, pull-out strength, and repeatability. Further, since the pipe body can freely rotate during piping work, there is also the benefit of improving the workability of piping.

Next, the present invention will be explained in more detail with reference to the drawings, but of course the present invention is not limited to the embodiments, and modifications can be made within the technical idea of the present invention.

As shown in FIG. 1, for example, a pipe joint 20 according to the present invention includes a joint body 1 in which a pipe body can be fitted into a hollow part and has a stepped part for holding a member in the hollow part, and a joint body 1 that is locked in the joint body 1. A seal ring 2 sealingly holds the outer periphery of the fitted pipe in contact with the inner circumferential surface of the joint, and a seal ring 2 is press-fitted and supported inside the end 3 on the side of the pipe insertion opening in the joint body 1, and the inner diameter is fixed at the tip. A push ring 4 having an enlarged step 5, rotatable within an annular gap 8 at a predetermined interval provided between a distal end surface 6 of the push ring 4 and a step 7 provided circumferentially within the joint body 1. It is equipped with a gripping tool 9 having a claw piece that bites into the outer periphery of the tube body to be loosely fitted and connected, and a tapered surface 11 is formed at the tip for releasing the biting of the claw piece into the outer circumferential surface of the tube body. Open tube 10 having a flange portion 12
However, the step 5 and the flange portion 12 are supported and loosely inserted into the inner wall surface of the push ring 4 so as to engage with each other.
In this configuration, the gripping tool 9 is loosely fitted into the annular gap 8 formed between the distal end surface 6 of the push ring 4 that holds the open tube 10 and the inner circumferential surface of the joint body 1. This is advantageous because the annular gap 8 for loosely fitting the gripping tool 9 can be formed while maintaining the optimal relationship between the tool 9 and the open cylinder 10.

Here, the gripping tool 9 is made of an elastic metal material, and its shape is, for example, as shown in detail in FIG. 2 and FIG. It has a dish-shaped cut surface that is bent in the insertion direction of the tube on the inner peripheral edge side. The gripping tool 9 is loosely fitted into an annular gap 8 provided in the pipe joint at the annular base 14, and when in use, the claws 13 are not in contact with any part of the pipe joint. It's getting old. Therefore, the gripping tool 9 has a small contact area with the joint body, etc., and there is little friction during rotation, so that it can be smoothly rotated within the pipe joint. The number of claws 13 and the shape of the edges in the gripping tool 9 can be changed as appropriate depending on the material, outer diameter, wall thickness, etc. of the pipe to be connected.

Next, we will explain the usage mode of the pipe joint 20 according to the present invention in a fourth manner.
This will be explained based on the diagram.

When the tube body 30 is inserted into the joint body 1, the tube body 3
0 is inserted into a predetermined position against the elastic force of the claw piece 13 of the gripping tool 9, that is, to a position where its tip abuts on the stepped portion 15. When a force is applied to pull it out, the edge formed at the tip of the claw piece 13 of the gripper 9 bites into the outer peripheral surface of the tube body 30 and stands up.
The tube body 30 is connected and fixed. The gripping tool 9, which bites into the outer circumferential surface of the tube body 30 and grips it, is loosely fitted into the annular gap 8 at the annular base 14 and can rotate freely, so it can be used, for example, in a movable part to handle torsional loads. When the torsional load is applied, the tube body 30 is quickly rotated while being held to release the torsional load, thereby maintaining a normal connection state at all times.

Note that if a lubricant such as solid oil is applied to the surface of the seal ring 2 in advance, there will be less friction between the tube body 30 and the seal ring 2, and rotation of the tube body 30 when subjected to a torsional load will be prevented. Even easier,
It is also effective in maintaining airtightness.

The pipe joint according to the present invention has a gripping tool that grips the pipe body, which is loosely fitted into an annular gap at a predetermined interval provided in the pipe joint, and is rotatable, so that it connects when subjected to a torsional load. The condition is immediately corrected to a normal condition so that no strain is placed on the pipe body and the gripping tool in the pipe joint. In other words, in order to prevent flattening of the tube body due to torsional load that causes a decrease in airtightness, and to avoid applying more than necessary force to the claws of the gripping tool,
No deformation of the claw pieces occurred, and no deterioration in pull-out strength or repeatability was observed.

As explained above, according to the present invention, in a pipe joint in which the pipe body can be easily attached and detached without using tools, a plurality of claws that bite into the outer peripheral surface of the pipe body and grip the pipe body are provided inside the annular base. The gripper made of an elastic metal material on the peripheral side is held by loosely fitting the annular base into the annular gap formed between the step in the joint body and the end face of the push ring.
The gripper can freely rotate within the fitting. As a result, when the connected pipe body receives a torsional load, the connection part rotates smoothly and corrects the twisting state, so it can be used for moving parts and subjected to repeated torsional loads, or when piping. Normal connection is always maintained against twisting. Therefore, there is no deterioration in airtightness, pull-out strength, repeatability, etc., and it is particularly convenient for use in moving parts, and has the excellent effect of improving piping workability.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional side view of the pipe joint according to the present invention, Fig. 2 is a plan view showing an example of the gripping tool, Fig. 3 is a sectional view of the same, and Fig. 4 is a pipe fitting of the pipe joint according to the present invention. FIG. 1: Joint body, 2: Seal ring, 4: Push ring, 8: Annular gap, 9: Grip, 10: Open tube,
13: Claw piece, 14: Annular base, 20: Pipe joint, 3
0: tube body.

Claims (1)

[Scope of utility model registration request] A joint body into which a pipe body can be fitted into a hollow part and which has a stepped part for holding a member in the hollow part, and a joint body that is locked and fitted into this joint body and is sealed in contact with the outer periphery of the pipe body and the inner circumferential surface of the joint. A gripping tool made of an elastic metal material and having a plurality of claws on the inner circumferential edge side of the annular base, which are located in the joint body and are inclined in the direction of insertion into the tube, for biting into the outer periphery of the tube and gripping it. ,
A push ring is fitted and supported by the end of the joint body on the side of the tube body insertion port, and the push ring is slidably fitted into the push ring, and the claw piece is pushed down toward the inner wall of the joint body with its tip. The gripping tool has an open tube that releases the biting into the outer circumferential surface of the pipe body, and the gripping tool has an annular base that is free in an annular gap formed between the tip end surface of the push ring and the step in the joint body. A pipe joint characterized by being fitted and rotatably held.