JP2009103169A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint capable of extending a lifetime by mutually rotatably constructing a joint and a resin pipe and suppressing force acting on the resin pipe. <P>SOLUTION: The joint 10 comprises a cylindrical joint body 11, an insert 13 inserted in and supported by the joint body 11 at one end side thereof and having an expanded diameter part 12a of an end part of the resin pipe 12 externally fitted on another end side thereof, a sleeve 14 fastening and fixing the expanded diameter part 12a of the resin pipe 12 to the insert 13. A relative rotation member allowing relative rotation of the joint body 11 and the insert 13 is provided between the joint body 11 and the insert 13. The relative rotation means comprises a first engagement groove 21 formed on an inner circumference of the joint body 11, a second engagement groove 25 formed on an outer circumference surface of the insert 13, and an expandable split ring 27 engaging with the first engagement groove 21 and the second engagement groove 25. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to, for example, a joint used for connecting between the ends of resin pipes or between the ends of resin pipes and faucets in a water supply system or a hot water supply system piping system. The present invention relates to a joint that can prevent a resin pipe from rotating and twisting when connected to a water faucet or the like and shortening the life of the resin pipe.

  In recent years, resin pipes have been widely used as pipes for water supply, hot water supply, or drainage, and such resin pipes are connected to joints such as headers to construct water supply, hot water supply, or drainage piping systems. . Recently, various structures have been proposed for resin pipe connection methods. As such a joint, for example, a joint described in Patent Document 1 is known.

That is, the connection tool (joint) includes a connection tool body provided with an insertion tube portion inserted into a connection end portion of a synthetic resin pipe (resin pipe), and a connection end portion of the resin pipe between the insertion tube portion. In order to sandwich and connect the pipe, it is constituted by a moving sleeve that moves in the axial direction with respect to the inner tube portion. And when connecting a resin pipe to this joint, after expanding the internal diameter of a resin pipe using a diameter expansion tool, it inserts in the insertion cylinder part of a connector main body. Subsequently, the resin sleeve can be connected to the joint by press-fitting the movable sleeve into the inner tube portion and sandwiching the resin pipe between the inner tube portion and the movable sleeve.
JP 2002-349779 A (the second page and FIGS. 1 to 4)

  However, in the joint described in Patent Document 1, since the resin pipe is pressure-bonded between the insertion tube portion and the moving sleeve, the resin pipe rotates integrally with the joint. Therefore, when connecting the joint to a water supply device such as a water tap, the resin pipe also follows and rotates as the joint rotates. Therefore, after the joint is connected to the water supply device, the resin pipe is held in a twisted state, and there is a problem that the life of the resin pipe is shortened. Furthermore, when water hammer (water hammer) is applied to the joint after the resin pipe is connected to the joint, there is a problem that the life of the resin pipe is shortened because the impact acts directly on the resin pipe.

  Accordingly, an object of the present invention is to provide a joint that can be relatively rotated between the joint and the resin pipe, and can extend the life by suppressing the force applied to the resin pipe.

  In order to achieve the above object, a joint according to a first aspect of the present invention includes a tubular joint body, one end inserted into the joint body and supported, and the other end of the resin pipe end. An insert in which the expanded diameter portion is externally fitted, and a sleeve that is fitted into the expanded diameter portion of the resin pipe in a state in which the expanded diameter portion of the resin pipe is externally fitted to the insert, and is fastened and fixed to the insert. A relative rotation means for relatively rotating the joint body and the insert is provided between the joint body and the insert.

  According to a second aspect of the present invention, there is provided the joint according to the first aspect, wherein the relative rotation means includes a first engagement groove formed on the inner peripheral surface of the joint main body and a second engagement formed on the outer peripheral surface of the insert. It is characterized by comprising a joint groove and an expandable / contractible split ring that engages with the first engagement groove and the second engagement groove.

  According to a third aspect of the present invention, there is provided the joint according to the second aspect, wherein a tapered surface is formed on the inner peripheral edge of the joint body on the insert insertion side so as to increase in diameter toward the opening side in order to facilitate the insertion of the split ring. It is characterized by.

  A joint according to a fourth aspect of the present invention is the joint according to any one of the first to third aspects, wherein the outer peripheral surface of the insert is provided with a retaining protrusion that prevents the diameter-enlarged portion of the resin pipe from slipping out. It is characterized by being.

  According to a fifth aspect of the present invention, there is provided the joint according to any one of the first to fourth aspects, wherein a chamfered portion for facilitating the insertion of the sleeve is provided on the inner peripheral edge of the distal end portion in the insertion direction of the sleeve. It is formed.

  In the joint according to the first aspect of the present invention, an insert in which the expanded portion of the resin pipe is fastened and fixed is interposed between the joint body and the expanded portion of the end portion of the resin pipe. Is provided with a relative rotation means for relatively rotating the insert and the joint body. For this reason, when a joint main body rotates, an insert, ie, a resin pipe, can hold the original state, without rotating. Therefore, it can comprise between a joint and a resin pipe so that relative rotation is possible, the force added to a resin pipe can be suppressed, and a lifetime can be extended.

  In the joint according to the second aspect of the present invention, the first engaging groove in which the relative rotation means is formed in the inner peripheral surface of the joint body, the second engaging groove formed in the outer peripheral surface of the insert, and the first It is comprised from the engagement ring and the split ring which can be expanded / contracted engaged with a 2nd engagement groove. Therefore, in addition to the effect of the first aspect of the invention, the relative rotation means can be configured easily and the insertion of the insert from the joint body can be prevented.

  In the joint according to the third aspect of the present invention, the inner peripheral edge of the joint main body on the insert insertion side is formed with a tapered surface whose diameter increases toward the opening side. For this reason, in addition to the effect of the invention according to claim 2, the split ring is guided by the tapered surface when the insert is inserted into the joint body, and the split ring is inserted into the first engagement groove and the second engagement groove. It can be done easily.

  In the joint according to the fourth aspect of the present invention, the outer peripheral surface of the insert is provided with a retaining protrusion for preventing the diameter-enlarged portion of the resin pipe from slipping out. For this reason, in addition to the effect of the invention according to any one of claims 1 to 3, the retaining protrusion is engaged with the inner peripheral surface of the resin pipe, so that the resin pipe can be firmly fixed to the insert.

  In the joint according to the fifth aspect of the present invention, a chamfered portion for facilitating insertion of the sleeve is formed on the inner peripheral edge of the distal end portion in the insertion direction of the sleeve. Therefore, in addition to the effects of the invention according to any one of claims 1 to 4, the sleeve can be smoothly attached to the outer peripheral surface of the resin pipe.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
(First embodiment)
As shown in FIG. 1 (a), a joint 10 of this embodiment includes a joint body 11 having a substantially cylindrical shape, a base end side inserted into the joint body 11 and supported, and a resin pipe 12 on the tip side. Is formed of a cylindrical insert 13 and a sleeve 14 that fastens and fixes the resin pipe 12 to the insert 13. In the present embodiment, the left end side in FIG. 1A is referred to as a proximal end side, and the right end side is referred to as a distal end side.

  As shown in FIG.1 (b), the base end side of the coupling main body 11 is provided with a male screw portion 15 for connecting to a water supply device such as a water tap (not shown), and the male screw portion 15 is connected to the water supply device at the center portion. A tool engaging protrusion 16 is provided for engaging a tool to be screwed into the female screw portion. A tool locking projection 17 for mounting the sleeve 14 is provided at the distal end of the joint body 11.

  A fitting hole 19 having a diameter larger than that of the water passage hole 18 on the proximal end side is formed in the inner peripheral portion on the distal end side of the joint body 11, and the proximal end side of the insert 13 is formed in the fitting hole 19. It is comprised so that it may be fitted. The inner end portion of the fitting hole 19 is a contact surface 20 formed in a step shape, and the base end surface of the insert 13 is in contact. A first engagement groove 21 having an annular shape and a U-shaped cross section is formed in the inner peripheral surface of the joint body 11 (on the opening end side of the fitting hole 19). A first tapered surface 22 whose diameter increases toward the opening side is formed on the inner peripheral surface of the distal end portion of the joint body 11 (the distal end side from the first engagement groove 21).

  As shown in FIG. 1 (c), two annular grooves 23 are formed on the outer peripheral surface of the base end portion of the insert 13, and a rubber seal ring 24 is fitted into these annular grooves 23. And the joint body 11 are kept watertight. A second engagement groove 25 having an annular shape and a U-shaped cross section is recessed in the front end side of the annular groove 23 on the outer peripheral surface of the insert 13. The second engagement groove 25 is formed at the same position in the axial direction of the joint 10 as the first engagement groove 21 of the joint body 11 and the insert 13 is mounted on the joint body 11. The depth of the second engagement groove 25 is set to be larger than the diameter of the split ring 27 so as to accommodate a split ring 27 described later when the insert 13 is inserted into the fitting hole 19 of the joint body 11. .

  A second taper surface 26 having a diameter increasing toward the base end side is formed on the base end side of the outer peripheral surface of the insert 13 from the second engagement groove 25. A split ring (C ring) 27 is accommodated in the first engagement groove 21 of the joint body 11 and the second engagement groove 25 of the insert 13. The split ring 27 is configured to be expandable / contractable by a metal having a spring property such as phosphor bronze or stainless steel. In the state of FIG. 1A, the split ring 27 is urged in the diameter expansion direction. The first engaging groove 21, the second engaging groove 25, and the split ring 27 constitute a relative rotating means for the joint body 11 and the insert 13. The flow hole 13a in the inner peripheral portion of the insert 13 has substantially the same diameter as the water flow hole 18 of the joint body 11, and the flowing water can flow without resistance.

  The first taper surface 22 and the second taper surface 26 are inserted into the fitting hole 19 of the joint body 11 to reduce the diameter of the split ring 27 and the first engagement groove 21 and the second engagement groove 25. This guides the insertion of the split ring 27. The outer peripheral edge of the distal end portion of the insert 13 becomes a guide surface 28 formed in an arc shape in cross section, and the enlarged diameter portion 12a at the end portion of the resin pipe 12 is easily fitted on the insert 13. The outer diameter of the insert 13 is set slightly smaller than the inner diameter of the resin pipe 12. The resin pipe 12 is formed of a synthetic resin such as polyolefin (cross-linked polyethylene, polybutene, etc.), and the diameter of the resin pipe 12 is expanded until the end on the insertion side to the insert 13 is substantially the same as the outer diameter of the insert 13 by a diameter expansion jig. The enlarged diameter portion 12 a is fitted on the insert 13. Since the resin pipe 12 is thus provided with the enlarged diameter portion 12a and connected to the joint 10 by the enlarged diameter portion 12a, the inner diameter of the resin pipe 12, the flow hole 13a of the insert 13, and the water passage hole 18 of the joint body 11 are provided. The diameters are almost the same, and flow loss in the joint 10 can be avoided.

  On the outer peripheral surface of the distal end side of the insert 13, three annular retaining protrusions 29 forming an annular shape for preventing the resin pipe 12 from slipping out, that is, a first retaining protrusion 29 a at the distal end and a pair of proximal end side first protrusions 29 a. Two retaining protrusions 29b are provided. The first retaining protrusion 29a at the tip is formed wider than the second retaining protrusion 29b. An annular sleeve 14 is fitted on the outer periphery of the enlarged diameter portion 12 a of the resin pipe 12, and the tightening surface 43 on the inner circumference of the sleeve 14 tightens the enlarged diameter portion 12 a of the resin pipe 12, and the enlarged diameter portion 12 a It is clamped between the sleeve 14 and the insert 13. In this case, when the sleeve 14 is pushed into the outer periphery of the resin pipe 12 and attached, the retaining protrusion 29 bites into the inner periphery of the resin pipe 12, and the resin pipe 12 is fixed to the insert 13. As shown in FIG. 1 (d), chamfered portions having a circular arc cross section for enabling the sleeve 14 to be smoothly inserted into the outer peripheral surface of the enlarged diameter portion 12 a of the resin pipe 12 at the inner peripheral edges of the sleeve 14. 30 is formed. The inner diameter of the sleeve 14 is set slightly smaller than the outer diameter obtained by adding the thickness of the resin pipe 12 to the outer diameter of the insert 13. The joint body 11, the insert 13 and the sleeve 14 are made of a highly rigid metal material such as stainless steel or brass.

Next, a method for connecting the resin pipe 12 to the joint 10 configured as described above will be described.
As shown in FIG. 2 (a), first, the insert 13 is inserted into the fitting hole 19 of the joint body 11 until the tip of the insert 13 comes into contact with the contact surface 20 of the joint body 11, and the split ring 27 is inserted into the fitting body 11. The first engagement groove 21 is engaged with the second engagement groove 25 of the insert 13. At this time, since the joint body 11 is provided with the first taper surface 22 and the insert 13 is provided with the second taper surface 26, the split ring 27 is formed by the first taper surface 22 and the second taper surface 26. Is smoothly guided into the first engagement groove 21 and the second engagement groove 25 while being reduced in diameter. In the state where the split ring 27 is accommodated in the first engagement groove 21 and the second engagement groove 25, the split ring 27 is urged in the diameter increasing direction. On the other hand, a sleeve 14 is inserted into the end of the resin pipe 12.

  Subsequently, as shown in FIG. 2B, the diameter of the end portion of the resin pipe 12 is increased using a diameter expanding jig to form the expanded diameter portion 12a. In this case, the length of the enlarged diameter portion 12 a is formed to be the length of the exposed portion of the insert 13 from the joint body 11, and the inner diameter is formed to be larger than the outer diameter of the insert 13.

  Next, as shown in FIG. 2C, the enlarged diameter portion 12 a of the resin pipe 12 is inserted into the outer peripheral portion of the insert 13. At this time, since the guide surface 28 is provided on the outer peripheral edge of the tip of the insert 13, the enlarged diameter portion 12 a of the resin pipe 12 can be smoothly formed on the outer peripheral portion of the insert 13 without damaging the inner peripheral surface of the resin pipe 12. Can be plugged into.

  Finally, as shown in FIG. 2 (d), using a sleeve mounting tool, the sleeve 14 is placed on the outer periphery of the enlarged diameter portion 12 a of the resin pipe 12 until the tip abuts against the side surface of the tool locking projection 17. Push in. In this case, since the inner diameter of the sleeve 14 is set slightly smaller than the outer diameter of the insert 13 plus the thickness of the resin pipe 12, the expanded diameter portion 12 a of the resin pipe 12 is reduced in diameter, and the insert 13 The retaining protrusion 29 on the outer peripheral surface bites into the inner peripheral surface of the enlarged diameter portion 12 a of the resin pipe 12. Furthermore, since the chamfered portion 30 is formed at the inner peripheral edge of the end portion of the sleeve 14, the sleeve 14 can be easily pushed into the outer periphery of the enlarged diameter portion 12 a of the resin pipe 12 without damaging the outer peripheral surface of the resin pipe 12. it can. In this manner, the resin pipe 12 is prevented from being detached from the insert 13, and water is stopped between the enlarged diameter portion 12 a of the resin pipe 12 and the insert 13.

The effects exhibited by the above first embodiment will be described collectively below.
In the joint 10 of the first embodiment, an insert 13 separate from the joint body 11 in which the expanded diameter portion 12a of the resin pipe 12 is fastened and fixed is interposed between the joint body 11 and the resin pipe 12. Between the insert 13 and the joint main body 11, a relative rotation means for relatively rotating the insert 13 and the joint main body 11 is provided. For this reason, when the joint main body 11 rotates, the insert 13, that is, the resin pipe 12 can maintain the original state without rotating. Therefore, when the joint body 11 is connected to a faucet or the like, the resin pipe 12 does not rotate and twist, and when a water hammer is applied to the joint body 11, the impact acts directly on the resin pipe 12. There is nothing. Therefore, the joint 10 and the resin pipe 12 are configured to be rotatable relative to each other, and the force applied to the resin pipe 12 can be suppressed to prevent the resin pipe 12 from being damaged and its life can be extended.

  The relative rotation means includes a first engagement groove 21 formed on the inner peripheral surface of the joint body 11, a second engagement groove 25 formed on the outer peripheral surface of the insert 13, and the first engagement grooves. 21 and an expandable / contractible split ring 27 that engages with the second engagement groove 25. For this reason, the relative rotation means can be configured easily, and the insertion 13 can be prevented from being pulled out from the joint body 11.

  A first tapered surface 22 whose diameter increases toward the opening side is formed on the inner peripheral edge of the joint body 11 on the insert 13 insertion side, and a second taper is formed on the proximal end side from the second engagement groove 25 of the insert 13. A surface 26 is formed. For this reason, when the insert 13 is inserted into the fitting hole 19 of the joint body 11, the split ring 27 is guided by the first tapered surface 22 and the second tapered surface 26 and is reduced in diameter, and the first engaging groove 21 and the second 2 is accommodated in the engaging groove 25. Therefore, the split ring 27 can be easily inserted into the first engagement groove 21 and the second engagement groove 25.

  A retaining protrusion 29 for preventing the resin pipe 12 from slipping out is provided on the outer peripheral surface of the insert 13. For this reason, the sleeve 14 is inserted into the outer periphery of the enlarged diameter portion 12a of the resin pipe 12 to press the enlarged diameter portion 12a against the insert 13, and the retaining projection 29 bites into the inner peripheral surface of the enlarged diameter portion 12a. Therefore, the resin pipe 12 can be firmly fixed to the insert 13, and water can be stopped between the enlarged diameter portion 12 a of the resin pipe 12 and the insert 13.

A chamfered portion 30 for facilitating insertion of the sleeve 14 is formed on the inner peripheral edge of the sleeve 14 on the insertion side. Therefore, when the sleeve 14 is mounted on the outer peripheral surface of the enlarged diameter portion 12 a of the resin pipe 12, the chamfered portion 30 of the sleeve 14 can be smoothly performed while being in sliding contact with the outer peripheral surface of the enlarged diameter portion 12 a of the resin pipe 12.
(Second Embodiment)
In the second embodiment, the shape of the sleeve 14 and the shape of the retaining protrusion 29 are mainly changed, and the other configuration is the same as that of the first embodiment. Therefore, the differences from the first embodiment will be mainly described. The description of the same configuration as that of the first embodiment is omitted.

  As shown in FIG. 3D, a bulge-absorbing recess 35 is formed in an annular shape on the inner peripheral surface of the sleeve 14, and a retaining recess 36 is provided on the inner peripheral surface of the distal end side. The first retaining protrusion 29a is formed in an annular shape so as to have the same depth (width). The bulge absorbing recess 35 is for absorbing the bulge on the proximal end side of the enlarged diameter portion 12a when the sleeve 14 is fitted into the enlarged diameter portion 12a of the resin pipe 12. An inclined surface 37 is provided in the inner back portion (tip side) of the bulge absorbing concave portion 35, so that the sleeve 14 can be easily inserted into the enlarged diameter portion 12 a of the resin pipe 12.

  When the sleeve 14 is fitted into the enlarged diameter portion 12a of the resin pipe 12 and the enlarged diameter portion 12a is fastened to the insert 13, the enlarged recess portion 36 is formed by the first retaining protrusion 29a of the insert 13. 12a enters into the retaining recess 36 and holds the sleeve 14 so as not to slip out. Therefore, it is preferable that the inner diameter of the sleeve 14 in the portion where the retaining recess 36 is formed is set smaller than the diameter of the enlarged diameter portion 12 a of the resin pipe 12. The engagement surface 38 at the base end of the retaining recess 36 is provided in a plane orthogonal to the axis of the sleeve 14 so that the retaining of the sleeve 14 functions effectively.

  As shown in FIGS. 3B and 3C, the base edge of the first retaining protrusion 29 a is an arc surface 39, and the first retaining protrusion 29 a is inserted into the insert 13. It is configured so that the enlarged diameter portion 12a does not break by biting into the enlarged diameter portion 12a of the pipe 12. An intermediate portion of the first retaining protrusion 29a is a flat portion 44, and the enlarged diameter portion 12a is pushed into the retaining recess 36. The base edge of the pair of second retaining protrusions 29b becomes a sharp portion 40, and the sharp portion 40 bites into the enlarged diameter portion 12a of the resin pipe 12 that is inserted into the insert 13 to effectively prevent the enlarged diameter portion 12a from coming off. It is supposed to be. The leading edge of the second retaining protrusion 29b is an arc surface 41, and the diameter-enlarged portion 12a of the resin pipe 12 is smoothly inserted into the insert 13.

  As shown in FIG. 3A, when the sleeve 14 is inserted into the enlarged diameter portion 12a of the resin pipe 12, the tightening surface 43 of the inner periphery of the sleeve 14 inserts the inner peripheral surface of the enlarged diameter portion 12a of the resin pipe 12. By tightening to 13, the pair of second retaining protrusions 29b bite into the inner peripheral surface of the enlarged diameter portion 12a, and the resin pipe 12 is retained by the insert 13. Further, the enlarged diameter portion 12 a of the resin pipe 12 bulges by the flat portion 44 of the first retaining protrusion 29 a of the insert 13 and enters the retaining recess 36 of the sleeve 14, and the sleeve 14 becomes the expanded diameter portion of the resin pipe 12. 12a is prevented from coming off. Accordingly, the resin pipe 12 can be prevented from coming off and the sleeve 14 from coming off at the same time simply by fitting the sleeve 14.

It should be noted that the embodiment described above can be modified and embodied as follows.
As shown in FIG. 4A, a stepped chamfered portion 31 can be formed on the inner peripheral edge of both ends of the sleeve 14 instead of the chamfered portion 30 having the circular arc shape of the embodiment. Moreover, as shown in FIG.4 (b), it can replace with the chamfering part 30 which makes cross-sectional arc shape of embodiment, and can also form the inclined chamfering part 32. FIG.

  -As the joint 10 of the embodiment, the insert 13 can be used in common, and the male thread portion 15 of the joint main body 11 having a different type, size, etc., for example, a female screw or a flanged one can be used. Can be achieved.

  The first taper surface 22 provided on the inner peripheral edge of the joint body 11 and the second taper surface 26 provided on the insert 13 are changed in taper inclination angle or in a cross-sectional arc shape. You can also

It is also possible to form the guide surface 28 having a circular arc cross section formed on the outer peripheral edge of the distal end portion of the insert 13 with an inclined surface.
The retaining protrusion 29 on the outer peripheral surface of the insert 13 can be formed in a trapezoidal cross-sectional shape, a triangular sectional shape, or the like, and the retaining protrusion 29 can be one or two, or the retaining protrusion 29 The protrusion 29 can be omitted.

Further, the technical idea that can be grasped from the embodiment will be described below.
(1) The outer surface of the insert is formed with a taper surface that expands toward the base end side and is continuous with the second engagement groove, according to any one of claims 3 to 5. Fitting described. In this case, in addition to the effect of the invention according to any one of claims 3 to 5, the split ring is easily accommodated in the first engagement groove and the second engagement groove via the tapered surface. be able to.

  (2) The joint according to claim 4 or 5, wherein a guide surface for facilitating insertion of the resin pipe is formed on the outer peripheral edge of the tip portion of the insert. When comprised in this way, in addition to the effect of the invention which concerns on Claim 4 or Claim 5, the insertion of the resin pipe with respect to insert can be smoothly performed with a guide surface.

  (3) On the inner peripheral surface of the rear end portion in the insertion direction of the sleeve, a diameter-enlarged portion of the resin pipe bulges by a retaining protrusion provided at the distal end portion of the insert, thereby preventing the retaining sleeve from coming off. The joint according to any one of claims 1 to 5, wherein a place is provided. When constituted in this way, in addition to the effect of the invention according to any one of claims 1 to 5, it is possible to prevent the sleeve from coming off with respect to the enlarged diameter portion of the resin pipe.

  (4) The retaining protrusion provided at the tip of the insert is provided with a flat portion for expanding the diameter-expanded portion of the resin pipe and entering the retaining recess of the sleeve. The joint described in the technical concept (3). In this case, in addition to the effect of the invention according to the technical idea (3), the expanded diameter portion can be expanded without damaging the expanded diameter portion of the resin pipe.

  (5) The technical idea (3) or the technical idea (3) characterized in that an engagement surface is provided in a surface perpendicular to the axis of the sleeve at the inner end forming the recess for preventing the sleeve from coming off. The joint described in 4). In this case, in addition to the effect of the invention according to the technical idea (3) or the technical idea (4), the diameter-expanded portion of the resin pipe can be engaged with the engagement surface to effectively prevent the sleeve from coming off.

  (6) The joint according to claim 4 or 5, characterized in that a sharp portion that bites into a diameter-expanded portion of the resin pipe is provided at the top of the retaining protrusion. When comprised in this way, in addition to the effect of the invention which concerns on Claim 4 or Claim 5, the removal prevention of the enlarged diameter part of the resin pipe with respect to insert can be performed effectively.

(A) is sectional drawing which shows the coupling in the state which connected the resin pipe in 1st Embodiment, (b) is a half sectional view which shows a coupling main body, (c) is a half sectional view which shows an insert, (d) is a sleeve FIG. (A)-(d) is sectional drawing which shows the effect | action of a coupling. (A) is sectional drawing which shows the joint in the state which connected the resin pipe in 2nd Embodiment, (b) is a half sectional view which shows an insert, (c) is a partial expanded sectional view which shows an insert, (d) is a sleeve FIG. (A) And (b) is a half sectional view which shows another example of a sleeve.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Joint main body, 12 ... Resin pipe, 12a ... Diameter expansion part, 13 ... Insert, 14 ... Sleeve, 21 ... 1st engaging groove which comprises relative rotation means, 22 ... 1st taper surface, 25 ... 2nd engagement groove which comprises relative rotation means, 27 ... Split ring which comprises relative rotation means, 29 ... Detachment protrusion, 30 ... Chamfering part.

Claims (5)

A tubular joint body, an insert in which one end side is inserted and supported in the joint body, and a diameter-expanded portion of the resin pipe end portion is fitted on the other end side, and the diameter of the resin pipe is expanded in the insert And a sleeve that is fitted and inserted into the enlarged diameter portion of the resin pipe in a state in which the portion is externally fitted, and the enlarged diameter portion is fastened and fixed to the insert. Between the joint body and the insert, And a relative rotation means for relatively rotating the joint. The relative rotation means includes a first engagement groove formed on the inner peripheral surface of the joint main body, a second engagement groove formed on the outer peripheral surface of the insert, the first engagement groove and the second engagement groove. The joint according to claim 1, wherein the joint is configured with an expandable / contractible split ring that engages with the groove. 3. The joint according to claim 2, wherein a taper surface that increases in diameter toward the opening side is formed on an inner peripheral edge of the joint body on the insert insertion side in order to facilitate insertion of the split ring. The joint according to any one of claims 1 to 3, wherein a retaining protrusion that prevents the diameter-enlarged portion of the resin pipe from slipping out is provided on the outer peripheral surface of the insert. The chamfered part for making insertion of a sleeve easy is formed in the inner periphery of the insertion direction direction part of the said sleeve, The Claim 1 characterized by the above-mentioned. Fittings.

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