JP2003097785A - Connection structure of resin pipe and joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable connecting structure of a resin pipe and a joint allowing easy operation of fastening a box nut even in a small working site. SOLUTION: This structure is provided with a joint main body 1, a box nut 7, and a resin pipe fastening means installed in the box nut 7 beforehand and temporarily fixing the same to the joint main body 1. The resin pipe fastening means comprises a tapered collet 11 having a claw 12 on an inner circumference and a ring body 16 having an inner tapered surface 17 abutting on a tapered surface 14a formed on the outer circumference end part of the tapered collet 11 formed on an inner circumference.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a connection structure for a resin pipe and a joint.

[0002]

2. Description of the Related Art In the construction of piping for water supply and hot water supply, the main water supply pipe and the main water supply pipe from the hot water supply facility are pulled indoors,
The water supply main pipe and the hot water supply main pipe are connected to a water supply pipe header and a hot water supply pipe header, respectively, and these headers are connected to, for example, each stopcock located upstream of the hot and cold water mixing tap in the washroom. As a water supply pipe or hot water supply pipe, a resin pipe with excellent durability such as cross-linked polyethylene or cross-linked polybutene that is resistant to heat, does not easily deform, and does not rust, is inserted into a bellows-shaped sheath pipe. Therefore, in the case of water leakage, etc., it is convenient in that the resin pipe can be taken out from the sheath pipe and replaced by simply disconnecting both ends of the resin pipe while leaving the sheath pipe as it is. .

By the way, as a conventional resin pipe joint, there is a joint comprising a joint body 71, a cap nut 72 and a split ring 73, as shown in FIGS. 10 and 11. The procedure for connecting the resin pipe P is as follows.

(1) First, in order to confirm the insertion amount L of the resin pipe P into the joint body 71, a mark 74 is formed with a pen or the like at a position separated from the end face a of the resin pipe P by the insertion amount L.
Is drawn [see FIG. 10 (A)]. (2) The cap nut 72 and the split ring 73 are once removed from the joint body 71 of the joint assembled at the time of factory shipment, and the cap nut 72 and the split ring 73 are inserted into the resin pipe P in this order [Fig. 10 (B)]. (3) Be sure to insert the resin pipe P into the joint body 71 as far as it will go (see FIG. 10C). (4) Push the split ring 73 until it abuts against the joint body 71, and confirm that the split ring 73 and the mark 74 are in the same position (see FIG. 11A). (5) From the cap nut end 72a to the tip 7 of the split ring 73
The cap nut 7 is attached to the joint body 71 until the 3a protrudes by about 1 mm.
Tighten 2 [see FIG. 11 (B)]. The claw 73a formed on the inner periphery of the split ring 73 bites into the outer peripheral surface of the resin pipe P. In this case, the cap nut 72 is tightened with a tool, but it is necessary to rotate the cap nut 72 about three times so that the split ring 73 does not come off from the resin pipe P. (6) After tightening, draw a mark 75 on the cap nut 72 and the joint body 71 [see FIG. 11 (C)].

[0005]

However, it is not easy to tighten the cap nut 72 by three turns in a narrow construction site where the space is small. Therefore, there is a one-touch type joint having a structure in which a claw that bites into the outer peripheral surface of the resin pipe is pressed by an elastic member such as a spring without using a tool, but the reliability is low because the elastic member is used.

The present invention has been made in view of the above matters, and an object thereof is to provide a highly reliable resin pipe-joint connection structure capable of facilitating the tightening work of a cap nut even in a narrow construction site. Is.

[0007]

In order to achieve the above-mentioned object, the present invention has a connecting portion at the downstream end, and an inner cylinder portion extending from the downstream side to the upstream side of the connecting portion. On the other hand, while having an outer tubular portion that extends from the connecting portion toward the upstream side shorter than the inner tubular portion and forms an annular groove with the inner tubular portion, a male screw is provided on the outer peripheral surface of the outer tubular portion. A joint body having, and a resin pipe inserted into the annular groove,
From the downstream side, sequentially from the downstream side, a female screw portion formed with a female screw that is screwed into the male screw of the outer cylinder portion, a ring inner surface portion and a cap nut having a resin pipe insertion hole portion with which the outer periphery of the resin pipe abuts, and this cap nut. The cap nut is pre-fitted into the cap nut from the side of the female screw portion and is arranged on the annular inner surface portion in a state of being locked to the peripheral edge of the resin pipe insertion hole portion, whereby the cap nut is temporarily attached to the joint body. And a resin pipe tightening means capable of being stopped, and the resin pipe tightening means further comprises a taper collet having a claw on the inner circumference,
The inner taper surface that abuts the taper surface formed on the outer peripheral end of the taper collet is formed of a ring body formed on the inner circumference, and the annular shape of the cap nut when the cap nut is connected to the joint body. Between the inner surface portion and the inner cylindrical portion, an annular space for resin pipe insertion that communicates with the annular groove is formed, and in this state, the resin pipe of the joint body is inserted through the annular space during construction. When the cap nut is finally tightened after being inserted into the annular groove, the claws of the taper collet bite into the outer peripheral surface of the resin pipe, and the resin pipe for changing the bending direction of the resin pipe after the main tightening, The taper collet and the ring body are integrally rotatable around the central axis of the inner cylindrical portion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. 1 to 3 show a first embodiment of the present invention.

FIG. 1 shows a resin pipe joint assembled at the factory shipment stage. In this case, the cap nut is temporarily fixed to the joint body without using a tool.

FIG. 2 shows an O-ring groove formed on the outer peripheral surface of the inner cylindrical portion 3 facing the annular inner surface portion of the cap nut and an O-ring fitted in the O-ring groove.

FIG. 3 shows details of the tightening means for tightening the resin pipe when the cap nut is fully tightened.

1 to 3, reference numeral 1 denotes a joint body of a resin pipe joint 60. The joint body 1 is connected to, for example, a flow rate adjusting member (not shown) connected to communicate with an inlet of a water faucet (not shown) located downstream.
The joint body 1 has a male screw portion 2 (an example of a connecting portion) at the downstream end, and an inner cylinder portion 3 extending from the downstream side to the upstream side inside the male screw portion 2 while the male screw portion 2 has a male screw portion. An outer cylinder portion 5 extending from the portion 2 toward the upstream side shorter than the inner cylinder portion 3 is provided, and a male screw m is provided on the outer peripheral surface of the outer cylinder portion 5. Further, the male screw portion 2 is composed of a cylindrical portion 2b formed with a male screw e which is screwed into a female screw formed on the upstream end portion of the flow rate adjusting member, while the joint body 1 is composed of the cylindrical portion 2b and the outer cylinder. Between the parts 5, there is a hexagonal part 1a having an external hexagonal shape. Reference numeral 3a is a communication hole formed by the inner cylindrical portion 3, and 2a is a through hole penetrating the male screw portion 2,
It communicates with the communication hole 3a. Reference numeral 4 denotes an annular groove formed on the outer side of the inner tubular portion 3, and in this embodiment, it is formed so as to straddle the outer tubular portion 5 and the hexagonal portion 1a. That is, the annular groove 4
Is formed between the outer tubular portion 5 and the hexagonal portion 1 a and the inner tubular portion 3.

A resin pipe 6 is inserted into the annular groove 4. The resin pipe 6 is made of a pipe such as cross-linked polyethylene or cross-linked polybutene, which has excellent durability such as resistance to heat, deformation, and rust. The resin pipe 6 is, for example, a water supply pipe and a hot water supply which are respectively connected to a water flow control mechanism and a hot water flow control mechanism or a water flow control mechanism with a hot water stop function located upstream of a hot and cold water mixing tap Used as a tube. The male screw portion 2 of the joint body 1 is connected to the inlet of each of the flow rate adjusting mechanisms.

Reference numeral 7 denotes a cap nut, which is in contact with a female screw portion 8 in which a female screw n to be screwed into a male screw m of the outer cylindrical portion 5 is formed in order from the downstream side, an annular inner surface portion 9 and an outer periphery j of the resin pipe 6. It has a resin pipe insertion hole portion 10 in contact therewith.

The characteristic structure of the present invention will be described below.

Reference numeral 11 is a taper collet, and one end of the outer circumference having a taper surface is divided into a plurality of tightening pieces 14 (see FIG. 3) by a slit-shaped vertical groove S. 14a
Is a tapered surface portion formed on the outer periphery of each tightening piece 14. Each fastening piece 14 has a plurality of claws 12 on the inner circumference along the circumferential direction. Further, the tapered surface portion 14a
Is appropriately set to an inclination angle at which the tightening piece 14 is likely to be displaced inward when an external force is applied and to be easily subjected to an external force, and a large area as much as possible. Also, taper collet 1
The other end of 1 has an outward flange 15 at the lower end.

On the other hand, 16 is a ring body which covers each fastening piece 14 of the taper collet 11 from the outside, and the inner circumference has the tapered surface portion 14 formed on each fastening piece 14.
It is composed of an inner tapered surface 17 that contacts a.

Then, the ring body 16 is attached to the taper collet 1
When the inner taper surface 17 is in contact with the taper surface portion 14a, the length Z between the flange 15 of the taper collet 11 and the one surface 16b of the ring body 16 when covered with the inner surface 16b of the ring body 16 is reduced.
An annular space 18 is formed having The outer peripheral surface 11b of the taper collet 11 corresponding to the length Z has a straight shape. Then, at the stage of factory shipment, the inner taper surface 17 is in contact with the taper surface portion 14a, and the inner peripheral surface 10a of the resin pipe insertion hole portion 10 of the cap nut 7 is attached to the other annular surface of the ring body 16. The ring body 16 and the taper collet 11 are positioned inside the cap nut 7 with the peripheral surface 16a being locked and the flange 15 being in contact with the end surface 5a of the outer cylinder 5.

The inner cylindrical portion 3 has a pair of annular grooves 20 and 21 on the outer peripheral surface of the inner cylindrical portion 3 facing the annular inner surface portion 9 of the cap nut 7. The annular groove 21 has an inner diameter slightly longer than the annular groove 20. That is, the inner diameter R of the annular groove 21 is longer than the inner diameter r of the annular groove 20 by Δ.

An O-ring 20a having an inner diameter r is fitted in the annular groove 20. The protruding length of the O-ring 20a from the annular groove 20 (the protruding length from the outer peripheral surface 3a of the inner cylindrical portion 3) is small. On the other hand, an O-ring 21 a having an inner diameter R is fitted in the annular groove 21. By the way, since the O-ring 20a and the O-ring 21a have the same thickness, as shown in FIG. 2, the amount of protrusion of the O-ring 21a from the annular groove 21 is equal to the amount of protrusion of the O-ring 20a from the annular groove 20. It is large in comparison. That is, the O-ring 20a
The O-ring 21 a protrudes from the annular groove 21 by a length corresponding to the above-mentioned Δ longer than the protruding length of. In addition, the inlet end portion 23 of the annular groove 21 opposite to the annular groove 20 side.
2 (see FIG. 2) is formed in a ring shape with a divergent tapered surface that inclines downward as it goes outward.

Further, at the factory shipment stage, the ring body 16 and the taper collet 11 are fitted into the cap nut 7 in this order from the female screw portion 8 side of the cap nut 7, and the resin pipe insertion hole portion 10 of the cap nut 7 having an annular shape. After the ring body 16 and the tapered collet 11 are arranged on the annular inner surface portion 9 of the cap nut 7 in a state where the other annular peripheral surface 16a of the ring body 16 is locked to the inner peripheral surface 10a, the bag is formed without using a tool. The nut 7 is temporarily fixed to the joint body 1. When temporarily fixed, an annular space S for inserting the resin pipe, which communicates with the annular groove 4, is formed between the annular inner surface portion 9 of the cap nut 7 and the inner cylindrical portion 3. In addition, the temporarily fixed joint 60 for resin pipes
At the end face w of the hexagonal portion 1 a of the joint body 1 and the female screw portion 8 of the cap nut 7 positioned so as to face the end face w.
The distance L from the end surface 8a of the is set smaller than the length Z. Further, the outer diameter Y of the ring body 16 is preset so that a slight annular gap X is formed between the ring body 16 and the annular inner surface portion 9 in the temporarily fixed state and the final tightened state.

When the resin pipe 6 is inserted into the annular groove 4 through the annular space S, the O-ring 20a, which first contacts the resin pipe 6 in the annular space S, has a function of guiding the resin pipe 6. Subsequently, although the O-ring 21a that hits the resin pipe 6 has a large amount of protrusion into the annular space S, the inlet end 23 of the annular groove 21 is formed into a divergent tapered surface, so that it is crushed by the resin pipe 6. However, it is only deformed along the inlet end portion 23, and the rough resin pipe end surface 6a that has been cut does not cut the O-ring 21a. And this O
The sealability can be maintained by the ring 21a.

At the time of factory shipment, the joint 60 for resin pipe is preassembled by temporarily fixing the cap nut 7 to the joint body 1 without using a tool.

Then, at the construction site, the resin pipe 6
After inserting the above into the annular groove 5 of the joint body 1 through the annular space S, the hexagonal portion 1a of the joint body 1 and the cap nut 7 are simultaneously tightened by using tools respectively. Do the work.

In this final tightening work, the cap nut 7 is moved by the distance L until the end surface 8a of the female screw portion 8 of the cap nut 7 contacts the end surface w of the hexagonal portion 1a of the joint body 1. At this time, in the ring body 16, the one surface 16b of the ring body 16 passing through the outer peripheral surface 11b of the taper collet 11 is slidably in contact with the taper surface portion 14a of the taper collet 11 supported by the joint body 1. Move until you hit 15. During this movement, each tightening piece 14 of the taper collet 11 is uniformly displaced inward by the external force transmitted from the cap nut 7 via the ring body 16, and the taper collet 11 is moved.
That is, the claws 12 are surely bite into the outer peripheral surface of the resin pipe 6. In this way, since the claw 12 surely bites into the outer peripheral surface of the resin pipe 6 only by moving the ring body 16 by the short length Z, in this embodiment, the cap nut 7 is used.
The final tightening work can be completed only by tightening 180 degrees.

After the final tightening is completed, the resin pipe 6
When the operator turns the resin pipe 6 to change the bending direction, a slight annular gap X is formed between the ring body 16 and the annular inner surface portion 9, so that the resin pipe 6, the taper collet 11 and The ring body 16 is attached to the inner cylinder portion
It can be turned around the central axis of the. As a result, it is possible to surely avoid the situation where the resin body 6 spins around the inner surface of the ring body 16 without breaking the ring body 16 and the bite of the claw 12 is destroyed.

The joint body 1 has a lateral hole 30 having a circular shape in plan view and a small diameter in a portion where the annular groove 4 is located. In this embodiment, the lateral hole 30 is formed in the hexagonal portion 1 a of the joint body 1. Means for indicating the completion of the inserting operation to determine whether the resin pipe 6 is securely inserted is composed of a fitting member 31 fitted in the lateral hole 30 and a film 32. That is, the fitting member 31 has a cylindrical portion 33 having a size that fits into the lateral hole 30, a conical portion (one tip portion) 34 having a bottom surface having the same diameter as the diameter of the cylindrical portion 33, and the conical portion ( One tip portion) 34 and a conical portion (other tip portion) 35 having a bottom surface with a smaller diameter. The conical portion 34 and the conical portion 35 are provided at both ends of the cylindrical portion 33, respectively. The film 32 is attached at the time of factory shipment so as to cover the lateral hole 30 formed in the hexagonal portion 1a. Then, when the fitting member 31 moves outward in the lateral hole 30, the film 34 previously attached to the joint body 1 at the time of factory shipment so as to cover the lateral hole 30 has the fitting member 3 attached thereto.
It is broken by the conical portion 34 constituting 1. It is preferable that the film 32 and the fitting member 31 have different colors.

FIG. 4 shows the cap nut 7 after the final tightening is completed.
2 shows a second embodiment of the present invention, which is provided with a loosening prevention mechanism for preventing the loosening. In addition, in FIG.
The same symbols as those shown in are the same or equivalent.

The female screw portion 8 of the cap nut 7 has a lateral hole 36 at its tip. Inside this lateral hole 36, from the inside,
A fitting member 37, a spring 39 for constantly urging the fitting member 37 toward the inner cylinder portion 3, a film 38, and an E ring 39a for holding the spring 39 in the lateral hole 36 so that the spring 39 is not outside the lateral hole 36 are provided. Has been. On the other hand, in the vicinity of the hexagonal portion 1a of the joint body 1 in the outer tubular portion 5, an inclined surface 40 that gradually inclines outward as it goes to the hexagonal portion 1a, a concave portion 41 that follows this, and a hexagonal portion that follows this. Flat surface 42 extending to the portion 1a
Are formed.

Further, the fitting member 37 is composed of a columnar portion 43 having a diameter fitted in the recess 41, a columnar portion 44 having a larger diameter than this, and a conical portion 45.

In the final tightening work, the end surface 8a of the female screw portion 8 of the cap nut 7 is connected to the end surface w of the hexagonal portion 1a of the joint body 1.
The cap nut 7 is moved by the distance L until it hits. At this time, the columnar portion 43 rides on the inclined surface 40 so that the film 3
8 is broken by the conical portion 45, and then the columnar portion 43 fits into the recess 41, whereby the cap nut 7 can be locked to the joint body 1 via the columnar portion 43.

Therefore, even if the final tightening work is completed by merely contacting the end surface 8a of the female screw portion 8 of the cap nut 7 with the end surface w of the hexagonal portion 1a of the joint body 1, the cap nut 7 can be prevented from loosening thereafter.

In this embodiment, because the inclined surface 40 is provided on the outer circumference of the outer cylinder portion 5, the inner diameter and the outer diameter of the female screw portion 8 are larger than those of the female screw portion 8 of the cap nut 7 used in the first embodiment. Will be bigger than

FIG. 5 shows a distance L between the end surface w of the hexagonal portion 1a of the joint body 1 and the end surface 8a of the female screw portion 8 of the cap nut 7 when the cap nut 7 is temporarily fixed to the joint body 1. The 3rd Embodiment of this invention constituted so that it can be maintained until the final tightening work at the construction site so that the above will not be changed. Note that, in FIG. 5, the same reference numerals as those shown in FIGS. 1 to 4 are the same or equivalent.

In FIG. 5, 50 is a resin pin,
It is inserted across a lateral through hole 51 provided in the female screw portion 8 of the cap nut 7 and a hole groove 52 provided in the outer periphery of the outer cylindrical portion 5 at a position corresponding to the through hole 51. This insertion operation is performed when the resin pipe joint 60 is assembled at the factory shipment stage.

If the cap nut 7 of the resin pipe joint 60 brought to the construction site is loose, it is necessary to tighten the cap nut 7 by 180 ° or more, but such a situation can be reliably prevented. .

In each of the above embodiments, the ring body 1 is attached to the cap nut 7 from the female screw portion 8 side of the cap nut 7 at the stage of factory shipment.
6 and the taper collet 11 were separately fitted in this order.

6 and 7, the ring body 16 'and the taper collet 11' are configured to be fitted into the cap nut 7 in a locked state at the stage of factory shipment. 4 shows a fourth embodiment of the present invention for avoiding the loss of '. In FIGS. 6 and 7, the same reference numerals as those shown in FIGS. 1 to 5 are the same or equivalent. Further, in FIG. 6, for easy comparison,
The ring body 16 'and the taper collet 11' in the temporarily fixed state are shown on the left side as viewed from the front, while the ring body 16 'and the taper collet 11' in the fully tightened state are shown on the right side as viewed from the front.

6 and 7, the ring body 16 'used in this embodiment has a different shape from the ring body 16 used in each of the above embodiments. Further, the taper collet 11 'used in this embodiment also has a different shape from the taper collet 11 used in each of the above embodiments.

As shown in FIG. 7A, the ring body 16 'has an annular claw 50 in a state of protruding inward from the inner peripheral surface.
Has a tapered surface M on the other end side of the inner peripheral surface.
Have. Further, the claw 50 has a tapered surface 50a.

On the other hand, the taper collet 11 'is shown in FIG.
As shown in (B), the inner peripheral surface has a pair of claws 12a, 12b provided along the circumferential direction, and the hooking portion 51 and the engaging portion 56 provided along the circumferential direction are provided on the outer circumference. Have on the surface. The hooking portion 51 and the engaging portion 56 are provided at positions corresponding to the claw 12a and the claw 12b, respectively. The hooked portion 51
Is engageable with the pawl 50, and the engaging portion 56 is
Engages with the pawl 50 in the final tightened state. Further, the claws 12a and 12b bite into the outer peripheral surface of the resin pipe 6 at the time of final tightening similarly to the claw 12 used in each of the above embodiments. Further, the taper collet 11 ′ has the taper surface 50 a when the cap nut 7 is temporarily fixed to the joint body 1.
The engaging portion 56 has a tapered surface 56a that abuts on the engaging portion 56, and the hooking portion 51 has a tapered surface 51a that abuts the tapered surface M. Further, in the temporarily fixed state, the inner peripheral surface 1 of the resin pipe insertion hole portion 10 of the cap nut 7 is
0a and the end surface 5a of the outer cylinder 5 with the flange 15 of the taper collet 11 'abutting, the ring body 16' and the taper collet 11 'are located in the cap nut 7, but the claw 50
After the ring body 16 'and the tapered collet 11' are fitted into the cap nut 7 with the hook portion 51 engaged with the ring body 16 'through the tapered surface 51a and the tapered surface M by tightening the cap nut 7 Moves toward the end surface 5a, so that the claw 50 is separated from the hooked portion 51, as shown in FIG.

Thus, with the claw 50 of the ring body 16 'and the hooked portion 51 of the taper collet 11' engaged, the ring nut 16 'and the taper collet 1 are attached to the cap nut 7.
This embodiment has an advantage that the fitting work 1'can be fitted, the fitting work can be facilitated as compared with the above-mentioned respective embodiments, and the loss of the ring body 16 'or the tapered collet 11' can be avoided.

At the time of final tightening, the claw 50 rides over the taper surface 56a of the engagement portion 56, and the ring body 16 'and the taper collet 11' are retained with the claw 50 locked to the engagement portion 56. Located in the cap nut 7.

As shown in FIG. 6, the corner 63 of the hexagonal portion 1a of the joint body 1 is slightly shaved to form a curved surface portion 64, and the lateral hole 30 is provided in the curved surface portion 64, so that the final tightening work can be performed. When the hexagonal portion 1a is held by a tool, it can be easily held, and workability can be improved.

8 and 9, the ring body 16 'and the tapered collet 11' are fitted into the tightening nipple 61 instead of the cap nut 7 ', and the cap nut 7'is loosened after the final tightening is completed. , Claws 12a, 1 for the resin pipe 6
The 5th Embodiment of this invention constituted so that it can prevent certainly that the bite of 2b is destroyed is shown. In FIGS. 8 and 9, the same reference numerals as those shown in FIGS. 1 to 7 are the same or equivalent. Further, in FIG. 8, for ease of comparison, the ring body 16 'and the taper collet 11' in the temporarily fixed state are shown on the left side in the front direction, while the ring body 16 'in the final tightened state and A taper collet 11 'is shown.

In FIGS. 8 and 9, the cap nut 7 ′ has a female screw portion 8 having at one end a female screw n ′ that is screwed into the male screw m of the outer cylinder portion 5 of the joint body 1, and the inner diameter X of this female screw portion 8. It has a small diameter portion 9'having an internal thread n "formed on the inner peripheral surface 9'd having a smaller inner diameter Y. Reference numeral 64 is a step surface that connects the inner peripheral surface 8d of the female screw portion 8 and the inner peripheral surface 9'd of the small diameter portion 9 '. Further, 65 is a surface of the inner peripheral surface 8d on which the female screw n'is not formed.

On the other hand, the tightening nipple 61 is formed with a male screw m ′ that is screwed into the female screw n ″, and has an insertion portion 62 through which a small diameter portion 9 ′ is inserted, and a stepped surface 64 with a larger diameter.
The large-diameter portion 66 located inside the surface 65 of the cap nut 7'is prevented from moving into the small-diameter portion 9 '.
67 is a step surface that connects the outer peripheral surface of the large diameter portion 66 and the outer peripheral surface of the insertion portion 62.

In this embodiment, the ring body 16 ′ is not in the cap nut 7 ′ but in the large diameter portion 66 of the tightening nipple 61.
And the taper collet 11 'is fitted.

At the factory shipping stage, the screws m ',
After connecting the tightening nipple 61 and the cap nut 7 ′ through the n ″ without using a tool, the ring body 16 ′ and the taper collet 1 are inserted into the large diameter portion 66 of the tightening nipple 61.
1'is fitted, and in this state, the cap nut 7'is permanently fastened to the joint body 1 with a tool via the screws m and n'coated with an adhesive. As a result, the resin pipe joint 60 'in which the cap nut 7'and the joint body 1 are fixed via the screws m and n'is assembled.

In the final tightening work at the construction site, the hexagonal portion 1a of the joint body 1 and the insertion portion 62 of the tightening nipple 61.
And are fully tightened with a tool. Also in this case, the final tightening work can be completed only by tightening the tightening nipple 61 by about 180 ° as in each of the above-described embodiments.
The a and 12b can be surely bited into the outer peripheral surface of the resin pipe 6. Further, in the final tightening work, it is necessary to work so that the tool does not touch the cap nut 7 ′ as much as possible. There is a risk that the cap nut 7'and the joint body 1 may become unfixed,
If it is released, the cap nut 7'may loosen.

By the way, even if the tightening nipple 61 is loosened and moved toward the small diameter portion 9 of the cap nut 7'via the screws m'and n '' after the final tightening is completed, the stepped surface of the tightening nipple 61 will be changed. 67 can hit the step surface 64 of the cap nut 7'and prevent further movement. This allows
The bites of the claws 12a and 12b with respect to the resin pipe 6 are not destroyed.

[0052]

As described above, according to the present invention, it is possible to provide a highly reliable connection structure for a resin pipe and a joint which can easily tighten the cap nut even in a narrow construction site.

Further, it is possible to provide a connection structure for the resin pipe and the joint, which can surely connect the resin pipe to the joint for the resin pipe.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part configuration in the embodiment.

FIG. 3 is an exploded perspective view of essential parts in the embodiment.

FIG. 4 is a configuration explanatory view for explaining an operation of the second embodiment of the present invention.

FIG. 5 is a structural explanatory view showing a third embodiment of the present invention.

FIG. 6 is a structural explanatory view showing a temporarily fixed state and a final tightened state according to a fourth embodiment of the present invention.

FIG. 7A is an explanatory diagram of a main part configuration showing a ring body used in the fourth embodiment. (B) is a principal part configuration explanatory view showing a taper collet used in the fourth embodiment.

FIG. 8 is a structural explanatory view showing a fifth embodiment of the present invention.

FIG. 9 is an exploded cross-sectional view of essential parts in the fifth embodiment.

FIG. 10 is a configuration explanatory view showing a connection procedure of a conventional resin pipe joint.

FIG. 11 is a structural explanatory view showing a connection procedure of a conventional resin pipe joint.

[Explanation of Codes] 1 ... Fitting body, 6 ... Resin pipe, 7 ... Cap nut, 11 ...
Taper collet, 12 ... Claw, 14a ... Tapered surface portion, 1
6 ... Ring body, 17 ... Inner taper surface, 60 ... Joint for resin pipe.

Claims (2)

[Claims] 1. A connecting portion is provided at a downstream end of the connecting portion, and an inner cylindrical portion extending from the downstream side to the upstream side of the connecting portion is provided, while the inner cylindrical portion extends from the connecting portion toward the upstream side. While having an outer tubular portion that extends shorter than the inner tubular portion and forms an annular groove with the inner tubular portion, a joint body having a male screw on the outer peripheral surface of the outer tubular portion, and a resin pipe inserted into the annular groove, From the downstream side, sequentially from the downstream side, a female screw portion formed with a female screw that is screwed into the male screw of the outer cylinder portion, a ring inner surface portion and a cap nut having a resin pipe insertion hole portion with which the outer periphery of the resin pipe abuts, and this cap nut. The cap nut is pre-fitted into the cap nut from the side of the female screw portion and is arranged on the annular inner surface portion in a state of being locked to the peripheral edge of the resin pipe insertion hole portion, whereby the cap nut is temporarily attached to the joint body. Resin pipe tightening hand that can be stopped Further, the resin pipe tightening means is provided with a step, and a taper collet having a claw on the inner circumference,
The inner taper surface that abuts the taper surface formed on the outer peripheral end of the taper collet is formed of a ring body formed on the inner circumference, and the annular shape of the cap nut when the cap nut is connected to the joint body. Between the inner surface portion and the inner cylindrical portion, an annular space for resin pipe insertion that communicates with the annular groove is formed, and in this state, the resin pipe of the joint body is inserted through the annular space during construction. When the cap nut is finally tightened after being inserted into the annular groove, the claws of the taper collet bite into the outer peripheral surface of the resin pipe, and the resin pipe for changing the bending direction of the resin pipe after the main tightening, A connecting structure for a resin pipe and a joint, wherein the taper collet and the ring body are integrally rotatable around a central axis of the inner cylindrical portion. 2. The cap nut has a tightening nipple fitted with the taper collet and a ring body fitted therein by screwing. Further, the cap nut and the tightening nipple are fitted after the main tightening is completed. 2. A loosening prevention means for preventing the tightening nipple from loosening.
Connection structure of resin pipe and joint described in.