JP2544628Y2 - 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 an improvement in a coupling 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, as shown in FIG. 3 of the accompanying drawings, a joint body 11 having an inner core portion 12 integrally protruded therefrom, A split ring 13 fitted on the inner core portion 12 so that the plastic pipe p can be sandwiched between the core portion 12 and a fastening ring 14 slidably fitted on the split ring 13 are provided. While the split ring 13 is provided with a locking portion 13a for locking with the locking portion 12a provided on the inner core portion 12, the split ring 1
The outer peripheral surface of 3 is formed in a tapered surface portion 13b inclined so that the locking portion 13a side becomes gradually smaller in diameter, and the split ring 13 is tightened by the tightening ring 14 so that the plastic pipe p can be connected to the joint body 11. A structure is known (see Japanese Utility Model Application Laid-Open No. 63-125281).

In FIG. 3, reference numeral 13c denotes a flange provided on the split ring 13, reference numeral 15 denotes a notch provided on the outer peripheral surface of the inner core portion 12, and reference numeral 16 denotes a ridge provided on the inner peripheral surface of the split ring 13. It is.

[0004]

In the conventional joint device shown in FIG. 3, the inner core portion 12 and the split ring 13 are locked by locking portions 12a, 13a provided on both sides. The operation of fitting the split ring 13 to the inner core portion 12 requires a considerable amount of skill.
In the initial stage of the tightening operation in which the tightening ring 14 slides on the tapered surface portion 13b of the split ring 13 (indicated by an imaginary line in the figure), the tightening ring 1 is tightened.
No. 4 is easily inclined, and causes a problem that the tightening force on the split ring 13 lacks uniformity.

Further, there is a problem that the adhesion between the inner core portion 12 and the inner wall of the plastic pipe p is poor, which causes water leakage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a joint between an inner core portion and a split ring without providing a locking portion for locking the inner core portion and the split ring. Screw the split nut into the main body, slide the tightening ring, crimp the tightening ring to the split ring, tighten the split ring to easily connect the plastic pipe, and even out the tightening force on the split ring. Another object of the present invention is to provide a plastic pipe joint device improved so that the inner core portion and the split ring can be firmly adhered to the plastic pipe.

Another object is to solve the problem that the plastic pipe is unduly twisted at the time of connection work, and to visually confirm the state of complete insertion of the plastic pipe, which is convenient for performing the connection work correctly. Another object of the present invention is to provide an improved plastic pipe joint device.

[0008]

In order to achieve the above-mentioned object, a plastic pipe joint device according to the present invention is characterized in that an inner core portion is integrally formed with an externally threaded pipe portion on the side to which the plastic pipe is connected. A split ring fitted on the inner core portion so that a plastic pipe can be held between the joint body and the inner core portion, and a tightening ring slidably fitted on the split ring portion. A joint device for a plastic pipe comprising: a plurality of locking notches inclined along an axial direction of the inner core portion on an outer peripheral surface of the inner core portion; and an inner peripheral portion of the split ring. On the surface, at the time of completion of tightening of the split ring by the tightening ring, a ridge portion is provided so as to face the valley of the above-mentioned notch portion, and the outer peripheral surface on the rear end side of the split ring gradually decreases in diameter toward the front end. And forming a tapered surface which is inclined, the rear end side inner peripheral surface of the ring fastening in correspondence with the tapered surface portion is formed into a tapered surface is in.

[0009] Then, in the male thread tube portion of the joint body,
A rear end opening is formed in a flange portion abutting on a rear end portion of the tightening ring, and a split nut having a width larger than at least the outer diameter of the plastic tube is provided along the axial direction, and this is screwed together. At the time of completion of the tightening of the tightening ring by the split nut, a gap is formed between the mouth end of the male thread pipe portion and the front end of the tightening ring, and a notch is provided at the front edge of the split ring. It consists of

[0010]

When the tightening ring is slid by the split nut screwed into the male screw tube, a gap is formed between the mouth end of the male screw tube and the front end of the tightening ring when the sliding operation is completed. While being formed, the split ring is tightened by a tightening ring, and a plastic tube can be tightened and connected between the inner core portion and the split ring. The notch of the inner core and the ridge of the split ring bite into the inner and outer wall of the plastic tube, respectively, so the split ring and the tightening ring are fixed on the inner core together with the plastic tube, and the tightly connected state is It is firmly defined and, due to the presence of the gap, it is possible to visually check whether the plastic tube is completely inserted through a cutout at the front end of the split ring.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2, a joint body generally indicated by reference numeral 1 is provided with a male screw pipe 2 connected to a fluid supply port side and a male screw pipe part 3 connected to a plastic pipe p so as to communicate with each other. In addition, an inner core portion 4 into which a plastic tube p is inserted is formed integrally with the mouth end portion 3a of the male screw tube portion 3 so as to protrude therefrom.

On the outer peripheral surface of the inner core portion 4, a plurality of locking notches 4a inclined along the axial direction are engraved, and the inner core portion 4 is provided on the inner core portion 4. A split ring 5 is fitted in the gap 4 so that a plastic tube p can be inserted therein, and a split portion 5a is provided in a state slightly inclined with respect to the axial direction.

The outer peripheral surface on the rear end portion side of the split ring 5 is a tapered surface portion 5 inclined so as to gradually decrease in diameter toward the distal end.
b on the inner peripheral surface of the split ring 5 at the time when the tightening of the split ring 5 by the tightening ring 6 described later is completed so as to face the valley 4b of the notch 4a. It is provided. A plurality of cutouts 5e (for example, about three cutouts) are provided at the front edge 5d of the split ring 5 at intervals.

A tightening ring 6 is slidably fitted on the split ring 5, and the inner peripheral surface of the tightening ring 6 is substantially the same as the outer diameter (diameter after tightening) of the flat surface portion 5 f of the split ring 5. It is formed on a portion 6a having a certain inner diameter and a tapered surface portion 6b corresponding to the tapered surface portion 5b of the split ring 5. The peripheral edge 6c of the rear end portion of the tightening ring 6 is formed in an arc shape or a pointed shape. When the split nut 7 described below is screwed into the male screw pipe portion 3 and rotated, the split nut 7 is tightened. The rear end of the ring 6 is in line contact with the peripheral edge 6c to reduce friction and prevent the plastic pipe p from being twisted during connection work.

The split nut 7 screwed into the male screw pipe portion 3 has a rear end formed in an inward flange portion 7a and a split 7b having a width larger than at least the outer diameter of the plastic pipe p.
Are provided along the axial direction. When the rear end peripheral edge 6c of the fastening ring 6 is brought into contact with the flange portion 7a, and the fastening ring 6 is slid by the screwing operation of the split nut 7, the split ring 5 is tightened and the inner core portion 4 and the split ring 5 are split.
A plastic tube p is clamped between the two, and the connection is established.

At the time of completion of the screwing operation of the split nut 7 in this connection work (in other words, at the time of completion of the fastening of the split ring 5 by the fastening ring 6), as shown in FIG. A gap a is formed between 3 a and the front end 6 d of the fastening ring 6. Then, through the gap a and the notch 5e of the split ring 5, it can be visually confirmed whether or not the plastic pipe p to be connected is completely inserted. If the split nut 7 is removed after the connection is completed, the split nut 7 can be used for other similar connection work.

[0017]

[Effects of the Invention] The present invention is as described above. The split ring can be easily mounted, and the plastic pipe can be easily connected by screwing the split nut to the male thread pipe portion. At this point, the ridge of the split ring is in close contact with the plastic pipe in a state facing the valley of the cut portion of the inner core portion, so that the sealing action between these members is strong and is particularly excellent in preventing water leakage.

When the connection is completed, a gap is formed between the mouth end of the male screw tube and the front end of the tightening ring, and a notch is provided on the front end side of the split ring. It is possible to visually check whether or not the plastic tube is completely inserted, which is convenient for correctly performing a connection operation, and its practical value is extremely large.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing one embodiment of the present invention in a connection completed state.

FIG. 2 is an exploded perspective view of the components in FIG.

FIG. 3 is a front sectional view showing a conventional joint device.

[Explanation of symbols]

 1 is a joint body 3 is a male threaded tube portion 3a is a mouth end portion 4 is an inner core portion 4a is a notched portion 4b is a valley portion 5 is a split ring 5a is a broken portion 5b is a tapered surface portion 5c is a ridge portion 5d is a front end edge 5e is a cutout 6 is a tightening ring 6b is a tapered surface 6d is a front end 7 is a split nut 7a is a flange 7b is split a is a gap p is a plastic pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Kureha 1-12-3 Shibaura, Minato-ku, Tokyo Ryowa Sanyo Co., Ltd. (72) Inventor Noriaki Hattori 8-3 Chuo, Ami-cho, Inashiki-gun, Ibaraki Prefecture No. 2 Inside Ryowa Sanshi Co., Ltd. (72) Inventor Tetsu Fujii 4-13 Aioicho, Itabashi-ku, Tokyo Inside Chiyoda Manufacturing Co., Ltd. (72) Inventor Kazuhiro Sueyoshi 1-chome 20 Chiyoda, Yokkaido, Chiba Prefecture No. 5

Claims (1)

(57) [Scope of request for utility model registration] 1. A plastic pipe having an inner core portion integrally protruding from a male threaded pipe portion on the side to which the plastic pipe is connected, and the inner core portion so that the plastic pipe can be clamped between the joint body and the inner core portion. What is claimed is: 1. A joint device for a plastic pipe comprising: a split ring fitted on a core portion; and a tightening ring slidably fitted on the split ring, wherein the inner core portion is provided on an outer peripheral surface of the inner core portion. A plurality of notches for locking, which are inclined along the axial direction of the split ring, and the inner peripheral surface of the split ring faces the valley of the notch when the tightening of the split ring by the tightening ring is completed. Protrusions are provided respectively, and the outer peripheral surface on the rear end side of the split ring is formed on a tapered surface portion inclined so as to gradually decrease in diameter toward the front end, and the tightening ring of the tightening ring is made corresponding to this tapered surface portion. A rear end side inner peripheral surface is formed as a tapered surface portion, and a rear end opening is formed in a flange portion abutting against a rear end portion of the tightening ring in the male screw tube portion of the joint body, and the plastic tube is formed. At the time when the tightening of the tightening ring by the split nut is completed, the mouth end of the male thread tube portion and the front end of the tightening ring are screwed together. A joint device for a plastic pipe, characterized in that a gap is formed between the split ring and a notch at a front edge of the split ring.