JPH0755438Y2 - Plastic pipe fitting equipment - Google Patents

Description

[Detailed description of the device] [Industrial applications]

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.

[Prior art]

As a joint device for connecting a plastic pipe to a fluid supply port such as hot and cold water, as shown in FIG. 3 of the accompanying drawings, a joint body 11 integrally provided with an inner core portion 12 and the inner core portion 12 are provided. A split ring 13 fitted on the inner core portion 12 so that a plastic pipe p can be sandwiched between
The split ring 13 is provided with a tightening ring 14 slidably fitted on the split ring 13, and the split ring 13 is provided with a locking portion 13a that locks with a locking portion 12a provided on the inner core portion 12. The outer peripheral surface of the ring 13 is formed into a tapered surface portion 13b inclined so that the locking portion 13a side is gradually reduced 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. It is known to have a structure (see Japanese Utility Model Laid-Open No. 63-125281).
In FIG. 3, 13c is a collar portion provided on the split ring 13.

[Problems to be solved by the device]

In the above conventional coupling device, the tightening ring having a relatively small width is used.
14 is slid to tighten the split ring 13, so that the tightening ring is slid on the tapered surface portion 13b of the split ring 13 at the initial stage of the tightening operation (shown by a virtual line in FIG. 3).
Since 14 easily tilts, there is a problem that the tightening force for the split ring 13 lacks uniformity, and the inner core portion 12 and the split ring 13 have locking portions provided on both sides.
The inner core portion 12 is locked by the 12a and 13a.
There is a problem that a considerable skill is required to fit the split ring 13 into the. The present invention solves the above-mentioned problem, and the purpose thereof is to disengageably engage with a joint body without providing a locking portion between the inner core portion and the split ring. Sliding the tightening ring with the split nut, crimping this tightening ring to the split ring, tightening the split ring to easily connect the plastic pipe, and improving the plastic force so that the tightening force on the split ring becomes uniform. It is to provide a joint device. In addition, another purpose is to improve the plastic pipe so that the plastic pipe can be checked by screwing it into the inner core part while the plastic pipe is unduly twisted during connection work. It is to provide a joint device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a joint device for a plastic pipe, which is a feature of the present invention, includes a joint body in which an inner core portion is integrally projectingly provided on a male screw pipe portion on a side where the plastic pipe is connected, and the inner core. A split ring fitted on the inner core so that a plastic tube can be fitted between the split ring and the inner ring, and a tightening ring slidably fitted on the split ring. A collar portion is provided on the tip end side of the split ring where the tapered surface portion of the tip end abuts the taper surface portion of the mouth end of, and the outer peripheral surface of the split ring on the rear end side gradually becomes smaller toward the rear end. The tapered inner peripheral surface of the tightening ring is formed so as to correspond to the tapered surface, and the inner peripheral surface of the tightening ring on the rear end side is formed on the tapered surface. In which tongue provided on the rear end of the clamping ring the split and the rear end opening of greater width than the outer diameter of consisting screwed removably split nut provided with a flange portion in line contact.

[Action]

When the tightening ring is slid by the split nut that is screwed into the male threaded pipe, the sliding ring causes the tip of the split ring to contact the inner peripheral surface of the male end of the male threaded pipe, and the split ring is tightened. The plastic pipe inserted between the inner core portion and the tightening ring can be tightened and connected by tightening. Since the rear end of the tightening ring is in line contact with the split nut, friction can be reduced, rotation is prevented, and the plastic tube is not twisted. Also, the split ring and tightening ring are crimped together and placed together with the plastic pipe on the inner core part in a fixed state, so the split nut can be unscrewed and pulled toward the plastic pipe side, and this can also be removed and placed. is there.

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1 and FIG. 2, a male screw pipe 2 connected to a fluid supply port side is provided in a joint body generally indicated by reference numeral 1.
And a male pipe portion 3 for connecting the plastic pipe p to each other are provided in a communicating state, and an inner core portion 4 for inserting the plastic pipe p is integrally provided at the mouth end portion 3a of the male screw pipe portion 3 so as to project. A notch 4a for locking is formed on the peripheral surface of the inner core portion 4. A split ring 5 is fitted on the inner core portion 4 with a gap into which the plastic pipe p can be inserted, and 5a is a cracked portion thereof which is slightly inclined with respect to the axial direction. It is provided in. The outer peripheral surface of the split ring 5 is formed on the flat surface portion 5c on the side of the flange portion 5b provided at the tip, and on the tapered surface portion 5d that is inclined so that the portion from the flat surface portion 5c to the rear end portion is gradually reduced in diameter. The end surface of the collar portion 5b is in surface contact with the taper surface portion 3b of the mouth end portion 3a of the male screw tube portion 3 and is formed in the taper surface portion 5e so as to increase the friction resistance. A tightening ring 6 is slidably fitted on the split ring 5, and the inner peripheral surface of the tightening ring 6 is a flat surface portion of the split ring 5.
It is formed on a portion 6a having an inner diameter that is almost the same as the outer diameter of 5c (the diameter after tightening) and a tapered surface portion 6b corresponding to the tapered surface portion 5d of the split ring 5, and the tip portion 6c is the split ring 5
It comes into contact with the collar portion 5b. An arcuate or pointed convex edge portion 6d is annularly provided at the rear end portion of the tightening ring 6, and the split nut 7 described later is screwed into the male screw pipe portion 3 and rotated. 7 and the convex edge portion 6d are in line contact with each other so that friction can be reduced. The split nut 7 screwed into the male screw tube portion 3 has a split nut 7 having a width larger than at least the outer diameter of the plastic pipe p inserted into the inner core portion 4.
7a is provided, and the rear end opening of the split nut 7 is formed on the inward flange portion 7b, and the convex edge portion 6d provided at the rear end portion of the tightening ring 6 abuts on this flange portion 7b, so that the split nut The tightening ring 6 is slid by the screwing operation of 7, and the split ring 5 is tightened to firmly attach the plastic pipe between the inner core portion 4 and the split ring 5, and the connection with the joint body 1 is made firm. It is designed only to keep it watertight. Since the tightening ring 6 does not come loose when it is pressed against the split ring 5, remove the split ring 7 after the connection is completed.
The split nut 7 can be used for other similar connection work.

[Effect of device]

The present invention is as described above, and it is easy to attach the split ring and to easily connect the plastic pipe by screwing the split nut to the male screw pipe portion. It is convenient for visually confirming the inserted state of the plastic pipe through the cracked part and the split nut, and to perform the connection work correctly. Then, the end face of the collar portion provided at the tip of the split ring is formed into a tapered surface to make surface contact with the male screw pipe side of the joint body, while the flange portion provided at the rear end of the tightening ring and the split nut side. Since the wires can be brought into line contact with each other, it is possible to prevent the plastic pipe from being twisted during the connection work. Also, after the connection is completed, the split nut can be removed and this split nut can be used for other similar connection parts, and the split ring can be evenly tightened by the sliding motion of the tightening ring. The practical value is extremely large.

[Brief description of drawings]

1 is a front sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of a split ring and a tightening ring, and FIG. 3 is a front sectional view showing a conventional coupling device. In the figure, 1 is a joint body, 3 is a male screw pipe portion, 3a is a mouth end portion, 3b
Is a tapered surface portion, 4 is an inner core portion, 5 is a split ring, 5a is a cracked portion, 5b is a collar portion, 5d is a tapered surface portion, 5e is a tapered surface portion, 6 is a tightening ring, 6b is a tapered surface portion,
6d is a convex edge portion, 7 is a split nut, 7a is a split portion, 7b is a collar portion, p
Is a plastic tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Kureha Takashi Kureha 8-3, Chuo, Ami-cho, Inashiki-gun, Ibaraki Ryowa Sanshi Co., Ltd. Product Research Laboratory (72) Satoshi Fujii 4 Aioi-cho, Itabashi-ku, Tokyo No. 13 Chiyoda Manufacturing Co., Ltd. (72) Inventor Kazuhiro Sueyoshi 1-20-5 Chiyoda, Yotsukaido-shi, Chiba (56) Bibliographic references 51-113215 (JP, U) Actual development 63-28127 ( JP, U)

Claims (1)

[Scope of utility model registration request] 1. A joint body in which an inner core portion is integrally projectingly provided on a male screw pipe portion on a side to which a plastic pipe is connected,
A split ring fitted on the inner core portion so that a plastic tube can be sandwiched between the inner core portion and the inner ring portion;
In a plastic pipe joint device provided with a tightening ring slidably fitted on the split ring, the tip of the split ring in which the tapered surface portion of the distal end abuts the tapered surface portion of the mouth end portion of the male screw pipe portion. The outer peripheral surface of the rear end of the split ring is formed into a tapered surface that gradually decreases in diameter toward the rear end, and the rear end of the tightening ring is made to correspond to this tapered surface. The inner peripheral surface of the section is formed into a tapered surface section, while the male threaded tube section has a width at least larger than the outer diameter of the plastic tube to be connected and a convex edge section provided at the rear end section of the tightening ring at the rear end opening. A joint device for a plastic pipe, characterized in that a split nut provided with a flange portion that comes into line contact is detachably screwed.