JPH0543354Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a coupling device used to connect a plastic pipe to a fluid supply port such as hot water or the like.

[Conventional technology]

As a coupling device for connecting a plastic pipe to a fluid supply port such as hot water or water, as shown in Fig. 3 of the attached drawings, a male threaded pipe 2 screwed onto the fluid supply port side of a joint body 1 is connected to a plastic pipe P. A male threaded port 3 is provided in a communicating state, and an inner core 4 having a flange portion 4a at its tip that opposes a shoulder portion 3a formed in the inner part of the male threaded port 3 is inserted into the male threaded port 3. A plastic tube p is inserted onto the core 4, a tightening ring 5 is fitted onto the plastic tube p, and the tightening ring 5 is screwed into the male threaded port 3 with a cap nut 6 to tighten the male threaded port 3. A structure is known in which the plastic pipe p can be connected to the joint body 1 by tightening the joint body.

[Problem that the idea aims to solve]

In the conventional device shown in FIG.
The clamping ring 5 and the plastic tube p are then crimped onto the plastic tube p. In this state, in the final stage of the connection work in which the tightening by the cap nut 6 further progresses, the cap nut 6, the tightening ring 5, and the plastic tube p rotate as one, and the plastic tube p is twisted and seated. Begins to succumb. Also, the reaction force due to twisting is the plastic tube p
There is also the problem that the plastic tube is not properly fitted into the inner core, causing water leakage. The present invention was made to solve the above problem, and its purpose is to tighten the tightening ring with a cap nut to prevent twisting of the plastic pipe when connecting the plastic pipe to the fluid supply port side. It is an object of the present invention to provide a joint device for plastic pipes which is improved so as to prevent this from occurring and to conveniently check the connection state at the time of inspection after connection.

[Means to solve the problem]

In order to achieve the above object, a joint device for plastic pipes, which is a feature of the present invention, includes a joint body having a male threaded pipe, an inner core that is press-fitted into a plastic pipe connected to the joint body, and In a joint device for a plastic pipe, which includes a tightening ring that fits onto the plastic pipe in the part to be press-fitted, and a cap nut that is screwed onto the male threaded pipe and tightens the tightening ring, the inner core is connected to the male threaded pipe. The opening of the tightening ring, which is integrated and protrudes from the end surface of the male threaded pipe, and which faces the end surface, is provided with a hole that prevents the male threaded pipe and the tightening ring from rotating relative to each other. Male and female engaging portions that can be engaged are provided, and the length of the male engaging portion is longer than the depth of the female engaging portion.

[Effect]

When the tightening ring is tightened with a cap nut, near the final stage of tightening, the male threaded pipe of the joint body from which the inner core is integrally protruded and the tightening ring are engaged by the male and female engaging parts. Since relative rotation is prevented, the plastic tubes can be connected without twisting. In addition, since the length of the male engaging part is longer than the depth of the female engaging part, the end of the plastic tube comes into contact with the end surface of the male threaded tube through the gap created by the difference, and the end of the plastic tube contacts the end surface of the male screw tube. You can check whether the tube is completely fitted onto the inner core.

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2, 11 is a joint body, and a male thread pipe 12 connected to the fluid supply port side and a male thread pipe 13 connecting the plastic pipe p are connected to the joint body 11 in a communicating state. An inner core 14 is integrally formed with the male threaded pipe 13 and protrudes concentrically from the end face 13a of the male threaded pipe 13. On the other hand, a tightening ring 15 is fitted onto the plastic pipe p that is fitted into the inner core 14, and this tightening ring 15 is tightened onto the male threaded pipe 1 by tightening the cap nut 16 screwed onto the male threaded pipe 13.
It is joined to the end face portion 13a of No.3. Also, male thread pipe 1
The end surface portion 13a of No. 3 is provided with an engaging portion (chamfered portion functioning as a female engaging portion) 17 formed by cutting out a part of the periphery of the end surface portion 13a.
Mouth 15a of tightening ring 15 facing 3a
is provided with an engaging portion 18 that can be engaged with the engaging portion 17 in a state corresponding to the engaging portion 17, and the male threaded pipe 13 and the tightening ring are connected by both engaging portions 17 and 18. 15 is designed to prevent relative rotation. In the illustrated case, the engaging portion 18 functioning as a male engaging portion is formed by providing opposing locking pieces that can be locked to the engaging portion 17 on the mouth portion 15a of the tightening ring 15. There are, but
Of course, this, including the engaging portion 17, is not limited to the illustrated form. Of both the male and female engaging parts 17 and 18, the length of the male engaging part (engaging part 18 in the case shown) is determined by the depth of the female engaging part (engaging part 17 in the case shown). The present invention is implemented by making the plastic pipe p longer than the plastic pipe p so that a slight gap can be formed between the end face 13a of the male threaded pipe 13 and the opening 15a of the tightening ring 15 when the connection of the plastic pipe p is completed.

[Effect of the idea]

The present invention is as described above, and when tightening with a cap nut, the male threaded pipe side and the tightening ring are placed in a state where they cannot rotate relative to each other due to the male and female engaging parts, so rotation of the plastic pipe is prevented. Twisting of the pipe can be completely prevented, there is no need to worry about buckling the plastic pipe during connection work, and water leakage after connection can be prevented. And, since the inner core is formed integrally with the male threaded pipe of the fitting body,
This method has the advantage of being extremely easy to connect plastic pipes, and is also effective in maintaining the watertightness of the plastic pipe joints. Furthermore,
For inspection after connection, simply loosen the cap nut and remove it from the top of the tightening ring. It is possible to check whether the plastic tube is completely fitted onto the inner core by touching the end surface of the male threaded tube, and this is extremely effective in ensuring the safety of the connection state.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of the present invention, Fig. 2 is a front sectional view showing an embodiment of the present invention;
This figure is a perspective view of the same as above in a separated state, and FIG. 3 is a perspective view of a conventional coupling device in a separated state. In the figure, 11 is the joint body, 13 is a male threaded pipe, 13
a is an end surface, 14 is an inner core, 15 is a tightening ring, 15a is a mouth portion, 16 is a cap nut, 1
7 and 18 are engaging portions, and p is a plastic tube.

Claims (1)

[Scope of utility model registration request] A fitting body having a male threaded pipe, an inner core that is press-fitted into a plastic pipe connected to this fitting body, a tightening ring that fits on the plastic pipe where the inner core is press-fitted, and a tightening ring that fits on the plastic pipe where the inner core is press-fitted. In a joint device for a plastic pipe, the inner core is integrated with a male threaded pipe and protrudes from the end face of the male threaded pipe, and the inner core is integrated with the male threaded pipe and protrudes from the end face of the male threaded pipe, and The mouth of the tightening ring facing the male threaded pipe is provided with male and female engaging portions that can engage with each other to prevent relative rotation between the male threaded pipe and the tightening ring. A joint device for a plastic pipe, characterized in that the depth is longer than the depth of the female engagement part.