JPH1019176A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance pull-out proofing strength between a joint main body and a pipe to a great extent, and thereby surely prevent the pipe from being pulled out because of impact by a water hammer and the like by screwing a fastening nut to a joint main body to which the pipe is inserted, and forming a toothed ring in such a way as to bite in the outer circumferential surface of the pipe. SOLUTION: When a vinyl chroride pipe 2 is connected in water supply pipelines and the like, the vinyl chroride pipe 2 is inserted in the inside of a joint main body 1 by a length as specified in a state that a fastening nut 4, a toothed ring 11 and an elastic ring are outwardly fitted in the vinyl chroride pipe 2 by way of a joint main body 1. Subsequently, when the fastening nut 4 is threadedly fastened with a male screw 3, the elastic ring 7 and the toothed ring 11 are pressed in the axial direction by the end face of the joint main body 1 and the end wall 6 of the fastening nut 4. In this case, the tip ends of the teeth 12 of the toothed ring 11 are brought into contact therewith with pressure in such a way as to be bit in the outer circumferential surface of the vinyl chroride pipe 2, and concurrently the aforesaid teeth are inclined to the direction reverse to the direction that the vinyl chroride pipe 2 is pulled out, so that the joint main body 1 can thereby be connected with the vinyl chroride pipe 2 with high pull-out strength provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint, for example, a pipe joint for water supply piping.

[0002]

2. Description of the Related Art In general, as a pipe joint for water supply piping using vinyl chloride, for connection by a cold construction method, an adhesive is applied to both sides of a receptacle and a spigot, and the receptacle and the spigot are inserted and bonded. A pipe joint that is connected by solidification of an agent and a pipe joint that can be connected even in water without using an adhesive are known.

FIG. 6 shows the latter pipe joint which is conventionally used. A joint body 1 made of a synthetic resin is connected to a vinyl chloride pipe 2.
Is formed into a cylindrical shape having an inside diameter into which the joint is inserted.
A female screw 5 and an end wall 6 which are externally screwed to the male screw 3 are provided on a tightening nut 4 which is externally fitted to the nut.
Is inserted into the joint body 1 with the vinyl chloride pipe 2 having the outside fitted therein.
The nut 4 is screwed onto the external thread 3 of the joint body 1, and the elastic ring 7 is compressed by the end of the joint body 1 and the end wall 6 of the nut 4. The outer periphery is tightened, and by this tightening, the joint between the joint body 1 and the polyvinyl chloride pipe 2 is provided with water tightness and pull-out resistance.

[0004]

In the above-mentioned pipe joint, since the pull-out resistance of the polyvinyl chloride pipe 2 is obtained only by the tightening force generated by the deformation of the elastic ring due to the compression, sufficient pull-out resistance is obtained. Is difficult to obtain, and there is a problem that the connection state is disconnected when an unexpected force such as a hydraulic impact (water hammer) is applied.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe joint in which a joint body and a pipe are joined by biting a toothed ring or a tightening press fitting to greatly improve pull-out resistance. .

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a joint body having an inner diameter into which a pipe is inserted and having an external thread provided on an outer peripheral surface of an end, and a pipe. A tightening nut that is externally threadedly engaged with the external thread while being externally fitted to the external thread;
It consists of an elastic ring and a toothed ring interposed between the joint body and the opposing surfaces of the tightening nut in a state of being externally fitted to the pipe, and the toothed ring has a plurality of teeth on its inner periphery, and has an axial direction formed by the tightening nut. The configuration adopts a configuration in which the teeth are engaged with the outer peripheral surface of the tube in the pull-out resistant direction by tightening.

According to a second aspect of the present invention, there is provided a joint body having an inner diameter into which a pipe is inserted and having an external thread provided on an outer peripheral surface of an end portion, and a tightening nut which is externally engaged with the external thread while being externally fitted to the pipe. And an elastic ring, a washer, and a clamping press fitting interposed between the joint body and the opposing surfaces of the tightening nut in a state of being externally fitted to the pipe. It is mounted so that it can be mounted, the claw fitting has teeth at the inside tip, and the teeth are engaged with the outer peripheral surface of the tube in the pull-out resistant direction by tightening the tightening nut in the axial direction. is there.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a first example suitable for a vinyl chloride pipe.
In the example shown in FIG.
Main body 1 having an inner diameter for inserting
A tightening nut 4 externally threadedly fitted to both ends of the joint body; an elastic ring 7 made of rubber or the like and a toothed ring 11 interposed between the joint body 1 and the opposing surfaces of the tightening nut 4 in a state of being externally fitted to the vinyl chloride pipe 2; It is constituted by.

The joint body 1 and the tightening nut 4 are made of a synthetic resin. The joint body 1 has external threads 3 on the outer peripheral surfaces of both ends. A mating female screw 5 and an end wall 6 are provided.

The elastic ring 7 is formed in an elliptical section or the like having an inner diameter that elastically fits on the vinyl chloride pipe 2 and an outer diameter that fits in the tightening nut 4.
As shown in FIG. 3, a thin metal plate is used and has an inner diameter that is fitted to the polyvinyl chloride pipe 2 and an outer diameter that fits in the tightening nut 4. A plurality of teeth 12 are arranged on the inner circumferential side at regular intervals in the circumferential direction. It has a structure in which the outer peripheral portion is bent toward one side.

The pipe joint of the first example has the above-described configuration. To connect the vinyl chloride pipes 2, the pipe joints are fastened to the vinyl chloride pipes 2 on both sides to be connected to each other via the joint body 1. With the nut 4, the toothed ring 11 and the elastic ring 7 fitted in the outside, vinyl chloride pipes 2 are inserted into the joint main body 1 from both ends by a predetermined length, and in this state, each tightening nut 4 is connected to the joint body 1. When the elastic ring 7 and the toothed ring 11 are moved toward the main body 1 and screwed to the male screw 3, the elastic ring 7 and the toothed ring 11 are pressed in the axial direction by the end face of the joint main body 1 and the end wall 6 of the tightening nut 4.

The elastic ring 7 is deformed by compression in the axial direction to tighten the outer peripheral surface of the vinyl chloride pipe 2 to maintain a watertight state, and at the same time, pushes the toothed ring 11 back toward the end wall 6 of the tightening nut 4. , For this the toothed ring 1
1 is a vinyl chloride tube 2 having the tips of the teeth 12 as shown in FIG.
And the teeth 12 are inclined reversely to the direction in which the polyvinyl chloride pipe 2 is pulled out.

Thus, when water pressure acts on the polyvinyl chloride pipe 2 in the pull-out direction, the teeth 12 further work to bite into the vinyl chloride pipe 2, and the joint body 1 and the vinyl chloride pipe 2
The pull-out resistance of the pipe is greatly improved, and the pipe can be prevented from coming off due to the impact of a water hammer or the like.

Next, FIGS. 4 and 5 show a second example suitable for connecting a metal tube, which has an inner diameter into which the metal tube 21 is inserted.
A joint body 23 having external threads 22 on the outer peripheral surfaces of both ends;
One end is a small-diameter portion externally fitted to the metal tube 21, and a female nut 24 on the inner peripheral surface of the other end is externally fitted to the male screw 22. An elastic ring 26, a washer 27, and a tightening press fitting 28 are provided between the joint body 23 and the opposing surface of the tightening nut 25 so as to be accommodated in the inside 25.

The end face of the joint body 23 and the tightening nut 2
The inner end surface of the one end portion 5 is formed as an inverted inclined surface that becomes wider toward the inner peripheral side as shown in FIG. 4, and the elastic ring 26 has a trapezoidal cross-sectional shape with a wider inner diameter side. ,
The washer 27 is a flat washer which is arranged at a position close to the joint body 23 and has an inner diameter fitted to the metal tube 21 and an outer diameter fitted in the tightening nut 25.

As shown in FIG. 5, the clamping press fitting 28 is provided with a plurality of claw fittings 30 at a plurality of locations on a ring-shaped connecting ring 29 made of a metal wire so as to be swingable at equal intervals in a radial manner.
An outer end of each claw fitting 30 is pivotally connected to the connecting ring 29, and a tooth 31 is formed at an inner end facing the inside of the connecting ring 29.

The pipe joint of the second example has the above-described configuration. To connect the metal pipe 21, a fastening nut 25, a fastening press fitting 28, a washer 27 and an elastic ring 26 are connected to the metal pipe 21. The end of the metal tube 21 is inserted into the joint main body 23 by a predetermined amount, and the tightening nut 25 is moved toward the joint main body 23 in this state, as shown in FIG. Then, the tightening nut 25 is screwed into the joint body 23.

When the tightening nut 25 is screwed, the nut 25 approaches the joint body 23, and the elastic ring 26 and the washer 2 are provided at the opposed end faces of the nut 25 and the joint body 23.
7 and the clamping press fitting 28 are axially compressed,
As shown in FIG. 4 (B), the elastic ring 26 is deformed by compression along the internal space of the tightening nut 25 to make the fitting portion between the metal tube 21 and the joint main body 23 watertight, and to tighten via the washer 27. The claw fitting 30 of the press fitting 28 is pressed toward one end of the nut 25.

When the claw fitting 30 is rotated about the connecting ring 29, the teeth 31 are pressed against the outer surface of the metal tube 21 in a biting manner, thereby ensuring the pull-out resistance of the joint body 23 and the metal tube 21. I do.

[0021]

As described above, according to the present invention, the toothed ring is made to bite into the outer peripheral surface of the tube by screwing the tightening nut into the joint body into which the tube has been inserted. The pull-out resistance of the pipe is greatly improved, and the pipe can be reliably prevented from coming off due to the impact of a water hammer or the like.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of a pipe joint according to the present invention before tightening.

FIG. 2 is an enlarged sectional view of a main part showing a tightened state of the same.

FIG. 3 is a perspective view of a toothed ring.

FIG. 4A is a longitudinal sectional view showing a second example of a pipe joint before being tightened, and FIG. 4B is a longitudinal sectional view showing a tightened state of the same.

FIG. 5 is a perspective view of a fastening press fitting.

FIG. 6 is a longitudinal sectional view showing a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint main body 2 Vinyl chloride pipe 3 Male screw 4 Tightening nut 5 Female screw 6 End wall 7 Elastic ring 11 Toothed ring 12 Teeth 21 Metal tube 23 Joint main body 25 Tightening nut 26 Elastic ring 27 Washer 28 Tightening press fitting 29 Connecting ring 30 Claw Fitting 31 teeth

Claims (2)

[Claims] 1. A joint body having an inner diameter into which a pipe is inserted and having an external thread provided on an outer peripheral surface of an end portion, a tightening nut which is externally fitted to the external thread while being externally fitted to the pipe, and externally fitted to the pipe. In this state, the elastic ring and the toothed ring are provided between the joint body and the opposing surfaces of the tightening nut, and the toothed ring has a plurality of teeth on an inner periphery, and the teeth are tightened in the axial direction by the tightening nut. A pipe joint adapted to bite in the pull-out resistance direction with respect to the outer peripheral surface of the pipe. 2. A joint body having an inner diameter into which a pipe is inserted and having an external thread provided on an outer peripheral surface of an end portion, a tightening nut which is externally fitted to the external thread while being externally fitted to the pipe, and externally fitted to the pipe. In this state, it consists of an elastic ring, a washer, and a tightening press fitting which are interposed between the joint body and the opposing surfaces of the tightening nut. A pipe joint in which the metal fitting has teeth at its inner end, and the teeth are engaged in the pull-out resistant direction with respect to the outer peripheral surface of the pipe when the tightening nut is axially tightened.