JP2570516Y2 - 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, for example, a plastic pipe is provided between a joint main body having an inner core portion integrally projecting therefrom and the inner core portion. A split ring fitted on the inner core portion so as to be able to be clamped, and a fastening ring slidably fitted on the split ring, and the fastening ring is slid using a split nut or the like; There is known a structure in which a split ring is fastened so that a plastic tube can be clamped between an inner core portion and the split ring (see Japanese Utility Model Laid-Open No. 3-78198).

[0003]

In this known joint device, when a tightening member such as a split nut is removed from the tightening ring, the tightening ring is reduced in diameter and becomes larger than the split ring that has crimped the plastic pipe. There is a problem that the connection is incomplete because it is pushed back by the repulsive action of the hem portion on the radial side.
Therefore, an object of the present invention is to provide a plastic pipe joint device improved so that the tightening state of the tightening ring is maintained even if a tightening member such as a split nut is removed, and the return thereof can be prevented.

[0004]

In order to achieve the above object, a plastic pipe joint device characterized by the present invention has an inner core portion protruding from one end of a joint body integrally with the joint body. In a joint device in which a split ring for clamping a plastic pipe between the inner core portion and the inner core portion and a fastening ring for fastening the split ring are fitted on the split ring, a fastening ring is provided. The inner peripheral surface of the distal end portion facing the joint body side is formed in a tapered surface portion expanded toward the distal end portion, and the portion of the inner peripheral surface adjacent to the tapered surface portion is formed along the circumferential direction. While the groove is provided, a ridge is provided on the outer peripheral surface of the split ring so that the groove can be engaged with the groove at the time when the tightening of the tightening ring is completed.

[0007]

When the tightening of the split ring by the tightening ring is completed, the concave groove and the ridge engage, the return of the tightening ring is prevented, and the connection state of the plastic pipe is determined. Also, the moment the concave groove and the ridge engage, the tightening force weakens,
It is possible to determine the completion of the tightening based on the feeling at that time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 and 2, the joint body is indicated by reference numeral 1, and an inner core portion 2 is integrally provided with the joint body 1 at one end 1 a of the joint body 1.
Note that, in the figure, a male thread tube portion and a flange portion connected to the fluid supply port side are omitted.

A split ring 3 for holding a plastic pipe p between the inner core 2 and the inner core 2.
However, a fastening ring 4 for fastening the split ring 3 is fitted on the split ring 3, and the split ring 3 is tightened by sliding the fastening ring 4 toward the joint body 1, and the plastic pipe p is attached to the inner core. It is a mechanism that can be sandwiched and connected with the part 2.

An inner peripheral surface of the tightening ring 4 on the side of the distal end 4a facing the joint body 1 is formed on a tapered surface 4b which is expanded toward the distal end 4a. A concave groove 5 is provided along the circumferential direction on the peripheral surface, and a convex ridge 6 is formed on the outer peripheral surface of the split ring 3 so that the concave groove 5 can be engaged with the concave groove 5 when the tightening of the tightening ring 4 is completed. It is designed so that the tightening state of the tightening ring 4 can be maintained.

In the above structure, the concave grooves 5 are provided continuously, but the convex shapes 6 may be provided in a discontinuous state.
Is equal to or less than the depth of the groove 5. Also,
It is preferable in terms of strength to form a horizontal portion 4c between the tapered surface portion 4b and the concave groove 5.

It is to be noted that, similar to the conventional joint device of this type, an engaging notch 2a inclined at an acute angle along the axial direction is provided on the outer peripheral surface of the inner core portion 2, and a split ring 3 is provided. Are provided on the inner peripheral surface of the plastic pipe p. Further, the split ring 3 is formed on a tapered surface 3c which is inclined so that the diameter on the right half side gradually decreases toward the rear end 3b in the figure.
d indicates division.

[0013]

The present invention is as described above, and the engagement of the concave groove and the ridge at the time of completion of the tightening prevents the tightening ring from returning, so that the connection state of the plastic pipe is perfect. Become. Further, the completion of the tightening can be determined in a timely manner, which is effective in preventing unreasonable tightening.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a connection state according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a released state in which a plastic tube has been removed from that shown in FIG.

[Explanation of symbols]

 1 is a joint body 1a is one end 2 is an inner core 3 is a split ring 4 is a tightening ring 4a is a tip 4b is a tapered surface 5 is a concave groove 6 is a ridge p is a plastic pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner core portion is integrally formed with one end of a joint body to project from the joint body, and a split ring for holding a plastic tube between the inner core portion and the inner core portion is provided on the inner core portion. Further, in a joint device in which a tightening ring for tightening the split ring is fitted on the split ring, an inner peripheral surface on a distal end side of the tightening ring facing the joint body side is expanded toward the distal end. Formed on the tapered surface portion, a groove is provided along the circumferential direction on the inner peripheral portion adjacent to the Taber surface portion, and the concave groove is formed on the outer peripheral surface of the split ring when the tightening of the tightening ring is completed. A joint device for a plastic pipe, characterized in that it is provided with a ridge that can be engaged.