JP2584019Y2 - Plastic pipe fitting equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device used for connecting a plastic pipe to a fluid supply port for hot water or the like.

[0002]

2. Description of the Related Art As a joint device for connecting a plastic pipe to a fluid supply port for hot water or the like, a plastic pipe can be clamped between a joint body having an inner core integrally protruding therefrom and the inner core. A tightening ring fitted on the inner core, and a cap nut screwed into the male screw part of the joint body to tighten the tightening ring, and when the tightening of the tightening ring has progressed, the male screw part and the tightening ring In order to prevent the relative rotation of the male screw part, there is provided a structure in which an engaging part placed in a male and female relationship is provided at two places at the end face part of the male screw part and the mouth part of the tightening ring opposed to the end face part. It is known (see Japanese Utility Model Laid-Open No. 1-149087).

[Problems to be solved by the invention]

In the above-mentioned known joint device, the male and female engaging portions are provided at two places to prevent the relative rotation between the male screw portion and the tightening ring. It could be solved, but by screwing the cap nut
Alone clamping pressing ring, clamping inhibited to clamping ring plastic tube engaging clamping rings engaging portion of the engaging portion and the male screw portion of a insufficient tightening of the plastic tube, the It was found that the connection was incomplete and there was a risk of water leakage.

[0004] The present inventors have studied variously and applied the above-described relative rotation preventing means to a split ring which can be firmly tightened. However, since the engaging portions of the male and female are present at two places each. It was not possible to tighten the split ring so that it could not be split, and the original function of the split ring could not be fully demonstrated. SUMMARY OF THE INVENTION An object of the present invention is to provide a plastic pipe joint device improved so that the connection can be strengthened by tightening with a split ring without causing twisting of the plastic pipe.

[0005]

In order to achieve the above-mentioned object, a plastic pipe joint device characterized by the present invention has a male thread portion formed in a joint body, and the male thread portion has an end face portion on the end face thereof. An inner core integrated with the screw portion is protruded, and a split ring for holding a plastic tube between the inner core and the inner core is fitted onto the inner core. One end of the front end of the split ring which is screwed into the threaded portion and faces the external threaded portion and the end faced portion, so that the male screw portion and the split ring cannot be rotated relative to each other. Is provided with an engaging portion placed on the surface.

[0006]

Near the final stage of tightening and tightening the split ring has progressed in [action] bag nut, the male screw portion and the split ring of the joint body which inner core is protruded integrally phase <br/> correspondingly The relative rotation is prevented by the engagement of the provided male and female engaging portions, and the plastic tubes are connected without twisting. In this case, since the male and female engaging portion is provided only in one place in mutually corresponding, not Okoshira the problem of the difficulty in tightening of the split ring, also split ring
Is reduced overall by tightening the cap nut and split ring
Plastic tube to the inner core
Since it can be crimped, the plastic tube can be firmly connected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2, the joint body is generally indicated by reference numeral 1. The joint body 1 has a male screw pipe 2 connected to the fluid supply port side on one side, and a cap nut described later on the other side. Male screw 3
An inner core 4 is integrally formed with the male screw portion 3 to protrude from the end face portion 3a.

A split ring 5 for holding the plastic pipe p between the inner core 4 and the inner core 4 is fitted, and a cap nut 6 is screwed into the male screw portion 3 to be tightened. 5 so that the plastic tube p can be clamped and connected between the inner core 4 and the inner tube 4.

An engaging portion 7 formed by cutting off a part of the end surface portion 3a is provided at one position of the end surface portion 3a of the male screw portion 3, while the front end of the split ring 5 facing the end surface portion 3a is provided. An engaging portion 8 is provided at one portion of the portion 5a so as to be freely engageable with the engaging portion 7 in a state corresponding to the engaging portion 7, and the male and female engaging portions 7, 8 are used to form a male screw portion. 3 and split ring 5
The present invention is implemented by engaging such that they cannot rotate relative to each other.

[0010] In the case shown in the figure, one of the engaging portions 7 is connected to the end face portion 3a.
The other engaging portion 8 is formed as a locking piece protruding from the front end portion 5a as a chamfered portion provided at one place on the periphery of the above, but the engaging portions 7, 8 are not limited to such a shape. Of course. Further, the engaging portion 8 on the side of the split ring 5 may be provided at two places with the split 5b sandwiched. In this case, the split ring 5 is tightened to substantially eliminate the split 5b. It is a place.

It is to be noted that, similar to the conventional joint device of this type, a notch 4a for locking, which is inclined at an acute angle along the axial direction, is provided on the outer peripheral surface of the inner core 4, A ridge 5 that cuts into the plastic pipe p on the inner peripheral surface
d are projected from each other. In addition, the split ring 5 is formed on a tapered surface that is inclined such that the right half side in the drawing gradually decreases in diameter toward the rear end 5c.

[0012]

[Effects of the Invention] The present invention is as described above. When tightening with the cap nut, the male screw portion and the split ring are placed in a state where they cannot rotate relative to each other due to the male and female engagement portions. It is prevented and twisting can be completely prevented. Therefore, the plastic tube has no risk of buckling and is effective in preventing water leakage after connection,
Moreover, the practical value of the split ring is extremely large, for example, the split ring can be completely tightened and the plastic pipe can be firmly connected.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the one shown in FIG. 1;

[Explanation of symbols]

1 is a joint body, 3 is a male screw part, 3a is an end face part, 4 is an inner core, 5 is a split ring, 5a is a front end, 5b is split, 6 is a cap nut, 7, 8 is an engaging part, and p is It is a plastic tube.

Claims (1)

(57) [Scope of request for utility model registration] A male thread is formed in a joint body, and an inner core integrated with the male thread is projected from an end face of the male thread, and the inner core is formed on the inner core. A split ring that clamps the plastic pipe is fitted between them, and a cap nut for tightening the split ring is screwed into the male screw part, and the end face of the male screw part and the front end of the split ring facing the end face part A joint device for a plastic pipe, characterized in that an engaging portion arranged in a male and female relationship is provided so as to prevent relative rotation between the male screw portion and the split ring at one position in the portion.