JP2002181263A - Dissimilar pipe connecting convertible joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dissimilar pipe connecting convertible joint capable of connecting a resin pipe to a metallic pipe, to provide a dissimilar pipe connecting convertible joint having expanding and contracting function and dropping-out preventing function, and to provide a dissimilar pipe connecting convertible joint suitably usable for the plumbing work of a protective pipe for wire or communication cable. SOLUTION: A resin-made sleeve connection part 12 and a metallic pipe connection part 13 are formed on a joint body 10. The connection part 12 comprises a tapered first slide surface 21, a cylindrical second slide surface 31 and a working part 40. A slip check ring 60 is fitted onto a resin-made sleeve 10 inserted to the connection part 12. The first slide surface 21 has the function of contracting the diameter of the ring 60 and the function of guiding the ring 60 to the second slide surface 31 side. The working part 40 exhibits the slip check effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a different pipe connection conversion joint used for connecting a metal pipe and a resin pipe.

[0002]

2. Description of the Related Art Hitherto, there has been known an underground type joint which is used for plumbing work and which exhibits an expansion / contraction action and a retaining action. This helps to prevent the connection point with the rupture or the pipe from coming out of the joint.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joint for connecting different kinds of pipes which is suitable for connecting a metal pipe and a resin pipe in a joint which exhibits an expansion / contraction action and a retaining action. Aim.

[0004]

According to a first aspect of the present invention, there is provided a conversion joint for connecting different types of pipes, wherein a cylindrical joint body is provided with a resin sleeve connecting portion and a metal pipe connecting portion, and the resin sleeve is connected to the resin sleeve connecting portion. Is plugged in. Therefore, by connecting the resin tube to the resin sleeve and connecting the metal tube to the metal tube connection portion of the joint body, the resin tube and the metal tube are connected via the conversion joint. The “metal pipe” connected to the metal pipe connection portion includes, of course, a metal pipe such as a steel pipe having an outer surface or an inner surface having a metal skin without an inner surface coating or an outer surface coating. Are covered with resin or the inner surface is covered with resin, so-called coated metal pipes and the like are included, and the metal pipes belonging to these are suitable for use when embedded in the ground because the coating exhibits a rust-preventive action. Further, the “joint main body” may be one whose outer surface is not coated with a resin or one whose resin is coated with a resin.

According to the present invention, the resin sleeve connection portion includes a tapered first sliding surface, a cylindrical second sliding surface extending from the small-diameter end of the first sliding surface, This second
An action portion connected to one end of the second slide surface on the side opposite to the first slide surface with the slide surface interposed therebetween, and an elastic member attached to the resin sleeve inserted into the resin sleeve connection portion; A retaining ring made of an elastic material, which is fitted in the outside in an in-contact state and which can be enlarged and reduced in diameter, is provided in a space surrounded by the first sliding surface.

The first sliding surface is prevented from sliding by reducing the diameter of the retaining ring by sliding the retaining ring when the retaining ring is moved together with the resin sleeve in the withdrawal direction of the resin sleeve. It has a function of causing the inner peripheral edge of the ring to bite into the resin sleeve, and a function of guiding the retaining ring biting into the resin sleeve to the second sliding surface side. When the retaining ring in contact with the second sliding surface is moved in the extracting direction, the retaining ring has a function of sliding in the extracting direction while keeping its outer diameter integrally, and the action section includes the (2) It has a function of contacting the retaining ring that has been moved in the withdrawal direction by sliding on the sliding surface and preventing the retaining ring from moving in the withdrawal direction.

In this heterogeneous pipe connection conversion joint, since the retaining ring is provided in the space surrounded by the tapered first sliding surface at the resin sleeve connecting portion, the inner peripheral edge of the retaining ring is made of resin. The diameter is not reduced enough to bite into the sleeve wall. Therefore, there is little risk that the resin sleeve inserted into the resin sleeve connection will have abrasion with the retaining ring.Even if the abrasion remains, the abrasion is small. It is easy to ensure the sealing performance.

[0008] Further, in this heterogeneous pipe connection conversion joint,
When the resin sleeve is moved in the pull-out direction, the retaining ring moves together with the resin sleeve in the pull-out direction. In the initial stage of the movement at this time, the retaining ring slides on the first sliding surface to reduce the diameter, and the inner peripheral edge of the retaining ring bites into the resin sleeve. Thereafter, when the resin sleeve is further moved in the withdrawing direction, the retaining ring is guided from the first sliding surface to the second sliding surface side along with the resin sleeve, and slides on the second sliding surface. .

The second sliding surface has a function of sliding when the retaining ring is moved in the withdrawing direction while keeping the outer diameter of the retaining ring in contact with the second sliding surface constant. As a result, it is possible to move the resin sleeve in the withdrawing direction by a length corresponding to the length of the second sliding surface.
Therefore, a situation does not occur in which the resin sleeve connecting portion inserted into the resin sleeve connecting portion is immediately stopped by the retaining ring, and the resin sleeve cannot be moved in the pull-out direction.

The retaining ring which has been moved in the withdrawal direction by sliding on the second sliding surface hits the action portion and is prevented from moving in the withdrawal direction. Thereby, the resin sleeve is stopped.

In the present invention, the outer peripheral surface of the joint body is covered with a resin layer, and one end and the other end of the coating layer are extended in the axial direction. Of the respective extension layers extended from the resin sleeve connection portion side packing is held in close contact with the resin sleeve, the metal pipe connection portion side extension layer In addition, a structure in which a packing that is in close contact with a metal pipe inserted into the metal pipe connection portion is held can be provided. According to this, when the heterogeneous pipe connection conversion joint is buried in the ground, packing of soil and water into the inside of the joint main body is prevented by the packing.

In the present invention, the action portion of the resin sleeve connection portion has a tapered contact surface extending from one end of the second sliding surface on the resin sleeve connection portion side,
The contact surface has a function of sliding on the second sliding surface of the resin-made sleeve connection portion and hitting the retaining ring which has been moved in the withdrawing direction, and has a function of applying a tightening force in the diameter reducing direction to the retaining ring. Is desirable. With this configuration, when the resin sleeve is pulled in the pull-out direction with the retaining ring abutting against the contact surface of the action portion, the tightening force of the retaining ring against the resin sleeve is equal to the tension at that time. It increases in proportion to the force and exhibits excellent retaining performance. Preferably, the inner peripheral edge of the retaining ring is formed as a sharp biting tooth.

In the present invention, the resin-made sleeve connecting portion has a cylindrical surface extending from the large-diameter end of the first sliding surface, is disposed in a space surrounded by the cylindrical surface, and ,
It is desirable to have a retaining ring holding member for positioning the retaining ring provided in a space surrounded by the first sliding surface of the resin sleeve connecting portion concentrically with the first sliding surface. In this device, the retaining ring is positioned concentrically with the first sliding surface by the action of the retaining ring holding member provided in the space surrounded by the cylindrical surface. A situation in which the resin sleeve cannot be inserted by hitting the retaining ring does not occur.

In the present invention, the retaining ring retaining member elastically cooperates with the retaining ring provided in the space surrounded by the first sliding surface of the resin sleeve connecting portion with the first sliding surface. It may have a function of positioning the retaining ring concentrically with the first sliding surface of the resin-made sleeve connection portion by pinching it.

In the present invention, the metal pipe connecting portion can be configured as follows. That is, a tapered first sliding surface, a cylindrical second sliding surface extending from the small-diameter end of the first sliding surface, and the second sliding surface are connected to the metal pipe connection portion. A working portion is provided on the opposite side of the first sliding surface on the opposite side from the first sliding surface, and is fitted in a metal tube inserted into the metal tube connection portion in an elastic contact state. An expandable / reducible retaining ring made of an elastic material is provided in a space surrounded by the first sliding surface, and the first sliding surface on the side of the metal pipe connection portion is connected to the metal pipe by the pull-out stopper. When the retaining ring is moved together with the metal tube in the metal tube withdrawal direction, the retaining ring is slid to reduce the diameter by sliding the retaining ring so that the inner peripheral edge of the retaining ring is bitten by the metal tube; A function of guiding the retaining ring biting into the pipe to the second sliding surface side on the metal pipe connection portion side. And, the second sliding surface of the metal pipe connecting portion side, the second
When the retaining ring in contact with the sliding surface is moved in the pull-out direction, the ring has a function of sliding in the pull-out direction while keeping its outer diameter constant. The second sliding surface on the side thereof has a function of hitting the retaining ring that has been moved in the withdrawal direction and having the function of preventing the movement of the retaining ring in the withdrawal direction. It is possible.

[0016]

FIG. 1 is a partially cutaway side view of an embodiment according to the present invention. The different pipe connection conversion joint A is formed by processing a thin steel pipe. That is, the cylindrical joint body 10 has a connecting wall portion 11 having a small diameter at the axial center portion thereof, and the joint body 1 has a small diameter.
The resin sleeve connecting portion 12 and the metal tube connecting portion 1
3 is provided.

In the resin sleeve connecting portion 12, the joint body 10 has a first wall portion 20 whose inner peripheral surface is formed as a first sliding surface 21 having a tapered shape, and is connected to one end of the first wall portion 20. A second wall portion 30 having an inner peripheral surface formed as a cylindrical-shaped second sliding surface 31 extending from the small-diameter end of the first sliding surface 21; An operation portion 40 is provided on the opposite side of the first wall portion 20 with respect to the one end of the second wall portion 30. Also, the first wall 2
A third wall portion 50 is provided at the other end of the first sliding surface 21 and has an inner peripheral surface formed as a cylindrical surface 51 extending from an end portion of the first sliding surface 21 on the large-diameter side.

A retaining ring 60 is provided in a space surrounded by the first wall 20. This retaining ring 60
For example, it is formed of a missing circular ring made of metal in which one portion in the circumferential direction is removed, and can expand and contract in diameter against its own elasticity. The retaining ring 60 has a biting tooth 61 on the inner peripheral edge thereof. The inner diameter of the retaining ring 60 in a no-load state (natural state) is slightly shorter than the outer diameter of the resin sleeve 100 described later. Therefore, when the retaining ring 60 is provided in the space surrounded by the first wall 20 and the resin sleeve 100 is inserted into the joint body 10, the resin sleeve 100 is While being inserted inside, the retaining ring 60 is fitted over the resin sleeve 100 in an elastic contact state. When the resin sleeve 100 is inserted into the retaining ring 60 and the outer peripheral surface rubs against the biting teeth 61 of the retaining ring 60, the biting teeth 61 damage the outer peripheral surface of the resin sleeve 100. Is less likely to occur, and even if it is damaged, the wound is only a small wound.

A retaining ring holding member 70 is provided in a space surrounded by the third wall 50. The retaining ring holding member 70 has a plurality of protrusions 71 at one end in a plurality of circumferential positions.
And is formed by a rubber ring having an annular projecting piece 72 on the inner peripheral side. The retaining ring holding member 70 is held in a fixed position by elastically contacting the third wall 50, and the protrusion 71 is disposed in a space surrounded by the first wall 20. The retaining ring 60
The retaining ring 60 is positioned concentrically with the first sliding surface 21 by being pressed against the sliding surface 21. The retaining ring holding member 70 has a sealing function of closely contacting the cylindrical surface 51 of the third wall portion 50 and the outer peripheral surface of the resin sleeve 100 inserted into the joint body 10 to seal the tightly contacted portions. are doing.

As shown in FIG. 1, when the resin sleeve 100 whose outer periphery is chamfered is inserted until it hits the connecting wall 11, the retaining ring 60 and the retaining ring holding member 70 are inserted into the resin sleeve during the insertion. 100. In this case, the retaining ring 60 is
0 in an elastic contact state, and the retaining ring holding member 70 is
It is in close contact with the outer peripheral surface of the resin sleeve 100, and at the same time, the third
It also adheres to the cylindrical surface 51 of the wall 50. Therefore, at the stage where the resin sleeve 100 is inserted into the joint body 10 by an appropriate length, each of the contact portions between the retaining ring holding member 70 and the cylindrical surface 51 of the third wall portion 50 and the outer peripheral surface of the resin sleeve 100 are It is sealed to exhibit sealing properties.

FIG. 2 is an enlarged cross-sectional view of a main part in a state where the different pipe connection conversion joint has a retaining function.

The first sliding surface 21 has a function of engaging the biting teeth 61 of the retaining ring 60 with the resin sleeve 100 and a function of guiding the retaining ring 60 to the second sliding surface 31 side. ing. That is, when the resin sleeve 100 is pulled from the state of FIG. 1 and moved in the withdrawal direction indicated by the arrow P in FIG. 2, the retaining ring 60 elastically in contact with the resin sleeve 100 moves with the resin sleeve 100. Since it moves in the pulling-out direction P, the retaining ring 60 that has been in contact with the first sliding surface 21 is slid to reduce the diameter. When the retaining ring 60 is reduced in diameter in this way, the biting teeth 61 bite into the outer peripheral surface of the resin sleeve 100. Thereafter, when the resin sleeve 100 is further pulled and moved in the withdrawing direction, the retaining ring 60 is moved. It moves while being guided to the second sliding surface 31 side.

When the retaining ring 60 is moved in the removal direction P, the second sliding surface 31 is slid while keeping the outer diameter of the retaining ring 60 in contact with the second sliding surface 31 constant. Has functions. Therefore, after the retaining ring 60 has shifted from the first sliding surface 21 to the second sliding surface 31, the resin sleeve 100 must be moved in the pulling direction by the length until the retaining ring 60 hits the action portion 40. P can be moved. For this reason, a situation in which the retaining action acts unexpectedly and the resin sleeve 100 is inadvertently prevented from being removed does not occur.

The action portion 40 has a function of contacting the retaining ring 60 which has been moved in the withdrawing direction P by sliding on the second sliding surface 31 and preventing the movement of the retaining ring 60 in the withdrawing direction. I have. For this reason, as shown in FIG.
Of the resin sleeve 100
Cannot be moved in the pulling-out direction P, and the retaining action is exhibited.

In this embodiment, the action portion 40 has an inner peripheral surface formed as a tapered tapered contact surface 41 extending from one end of the second sliding surface 31. However, it has a function of hitting the retaining ring 60 and applying a tightening force to the retaining ring 60 in the diameter reducing direction.
Therefore, as shown in FIG. 2, the resin sleeve 10 is held in a state where the retaining ring 60 is in contact with the contact surface 41 of the action section 40.
When 0 is pulled in the pulling direction P, the tightening force of the retaining ring 60 or the biting force of the biting teeth 61 on the pipe 100 increases in proportion to the pulling force at that time, and excellent retaining performance is exhibited. Is done.

Although the structure and operation of the resin sleeve connecting portion 12 of the joint body 10 have been described above, the joint body 1
The same applies to the structure and operation of the metal pipe connecting portion 13 of No. 0. In other words, the metal pipe connecting portion 13 has a tapered first
A sliding surface 21a, a cylindrical second sliding surface 31a extending from the small-diameter end of the first sliding surface 21a, and a second sliding surface 31a.
The action portion 40a provided on one side of the second sliding surface 31a on the opposite side of the first sliding surface 21a across the sliding surface 31a.
Are provided. A space surrounded by the first sliding surface 21a is a retaining ring 60a made of an elastic material, which is elastically fitted to a metal pipe (not shown) inserted into the metal pipe connecting portion 13 and is elastically fitted. Has been deployed. The first sliding surface 21a is provided on the retaining ring 6 fitted to the metal pipe.
0a is moved together with the metal tube in the metal tube withdrawal direction, by sliding the retaining ring 60a to reduce the diameter thereof so that the inner peripheral edge of the retaining ring can be bitten by the metal tube; Retaining ring 60 biting into the tube
a to the second sliding surface 31a side. In addition, the second sliding surface 31a is
Has a function of sliding in the withdrawal direction while keeping its outer diameter constant when the withdrawal-preventing ring 60a in contact with is moved in the withdrawal direction. Further, the action section 40a
Has the function of sliding against the second sliding surface 31a and hitting the retaining ring 60a that has been moved in the withdrawing direction, and has the function of preventing the movement of the retaining ring 60a in the withdrawing direction. Further, the first sliding surface 21a has a cylindrical surface 51a extending from the large-diameter end portion, and a retaining ring holding member 70a is provided in a space surrounded by the cylindrical surface 51a, so that the retaining ring 60a can be removed. It is positioned concentrically with the first sliding surface 21a.

In this embodiment, the outer peripheral surface of the joint main body 10 is covered with a resin layer 80, and one end and the other end of the resin layer 80 are extended in the axial direction to form the respective extension layers 81. A seal packing 82 is held on the inside of the end of the seal. In this one, a resin sleeve connecting portion 1
The packing 82 on the second side has a function of closely adhering to the resin sleeve 100 inserted into the joint body 10 and imparting a sealing property to that portion. The packing 82 on the side of the metal pipe connection portion 13 has a function of closely adhering to the metal pipe inserted into the joint body 10 and imparting a sealing property to that location. Therefore, in the case of such a configuration, it is not always necessary to exert the sealing property by the retaining ring holding member 70. Therefore, the retaining ring holding member 7
It suffices that 0 has a function of positioning the retaining ring 60 concentrically with the first sliding surface 21 and does not necessarily have to have a function of exhibiting sealing properties.

FIG. 3 is a partially cutaway side view of a different pipe connection conversion joint A in which the joint body 10 is manufactured by cutting a thick steel pipe. FIG. 4 is a perspective view of the different pipe connection conversion joint A shown in FIG. It is a principal part expanded sectional view in the state which is exhibiting the function.

The different type pipe connection conversion joint A of the embodiment shown in FIGS. 3 and 4 has a point that the joint body 10 is manufactured by cutting a thick steel pipe, and prevents the outer and inner surfaces of the joint body 10 from being cut off. Although the hot-dip galvanizing or painting is performed for rust, etc., and the retaining ring holding member 70 has a function of positioning the retaining ring 60 concentrically with the first sliding surface 21, the sealing property is not improved. 1 and 2 in that it does not have a function to exhibit and does not have a resin layer 80. Other configurations and operations are described in FIGS. 1 and 2. Therefore, the same or corresponding parts have the same reference characters allotted, and detailed description thereof will not be repeated.

FIG. 5 is a partially cutaway side view of a different pipe connection conversion joint A in which the joint body 10 is a cast product, and FIG. 6 shows a state in which the different pipe connection conversion joint A of FIG. It is a principal part expanded sectional view.

5 and 6, the joint body 10 is a cast product, and the retaining ring holding member 70 connects the retaining ring 60 to the first sliding surface 21. It differs from that described in FIGS. 1 and 2 in that it has a function of concentric positioning but does not have a function of exhibiting sealing properties.

In this embodiment, the third wall portion 50 is connected to the second wall portion 30 by omitting the first wall portion 20 of the joint body 10 described with reference to FIGS. ,
Instead of the first sliding surface 21 described in FIGS. 1 and 2, the inner peripheral surface 71 of the retaining ring holding member 70 provided in the space surrounded by the third wall 50 is formed in a tapered shape, When the retaining ring 60 is moved in the withdrawing direction, the inner peripheral surface 71 slides the retaining ring 60 that is in contact with the inner peripheral surface 71 to reduce the diameter of the retaining ring 60, thereby reducing the diameter of the retaining ring 60. A point that the inner peripheral edge has a function of biting the resin sleeve 100 and a function of guiding the inner peripheral edge 61 of the retaining ring 60 to the inner peripheral surface 71 side after biting the resin sleeve 100. However, they are different from those described with reference to FIGS.

Other structures and operations are the same or substantially the same as those described with reference to FIGS. 1 to 4 and the like, and the same or corresponding portions are denoted by the same reference characters and detailed description thereof will not be repeated.

[0034]

As described above, according to the present invention, the resin tube can be connected to the metal tube by connecting the resin tube to the resin sleeve and connecting the metal tube to the metal tube connection portion. become. In addition, the length of movement of the resin sleeve inserted into the joint body in the pull-out direction can be appropriately changed by design, and can be set to an appropriate length. It becomes possible to provide a connection conversion joint.

The different pipe connection conversion joint according to the present invention can be suitably used for pipe work of protecting pipes of electric wires and communication cables.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an embodiment according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part in a state where the different pipe connection conversion joint of FIG. 1 has a retaining function.

FIG. 3 is a partially cutaway side view of another embodiment according to the present invention.

FIG. 4 is an enlarged sectional view of a main part in a state where the different pipe connection conversion joint of FIG. 3 is performing a retaining function.

FIG. 5 is a partially broken side view of still another embodiment according to the present invention.

FIG. 6 is an enlarged cross-sectional view of a main part in a state where the different pipe connection conversion joint of FIG. 5 exhibits a retaining function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joint main body 12 Resin sleeve connection part 13 Metal pipe connection part 21, 21a First sliding surface 31, 31a Second sliding surface 40, 40a Working portion 41 Contact surface 60, 60a Retaining ring 70, 70a Retaining ring holding member Reference Signs List 80 resin layer 81 extension layer 82 packing 100 resin sleeve

Claims (6)

[Claims] 1. A heterogeneous pipe connection conversion joint in which a tubular joint body is provided with a resin sleeve connection part and a metal pipe connection part, and a resin sleeve is inserted into the resin sleeve connection part. A tapered first sliding surface, a cylindrical second sliding surface extending from the small-diameter end of the first sliding surface, and a second sliding surface sandwiching the second sliding surface at the resin sleeve connection portion. An operating portion is provided on the opposite side of the first sliding surface from one end of the second sliding surface, and is externally fitted in an elastic contact state with a resin sleeve inserted into the resin sleeve connecting portion. A retaining ring made of elastic material, which can be enlarged and reduced in diameter, is provided in a space surrounded by the first sliding surface, wherein the first sliding surface is formed of a resin sleeve in a direction in which the retaining ring is pulled out of the resin sleeve. Slide the retaining ring when it is moved with The function of causing the inner peripheral edge of the retaining ring to bite into the resin sleeve, and the function of guiding the retaining ring biting to the resin sleeve to the second sliding surface side. The second sliding surface has a function of sliding the retaining ring in contact with the second sliding surface in the withdrawal direction while keeping its outer diameter integrated when the ring is moved in the withdrawal direction; The actuation portion has a function of sliding on the second sliding surface and hitting the retaining ring that has been moved in the withdrawal direction, and has a function of preventing movement of the retaining ring in the withdrawal direction. Pipe connection conversion fitting. 2. A tapered first sliding surface, a cylindrical second sliding surface extending from a small-diameter end of the first sliding surface, and a second cylindrical sliding surface formed on the metal pipe connecting portion. An operating portion connected to one end of the second sliding surface on the opposite side of the first sliding surface with respect to the sliding surface, and being in elastic contact with the metal pipe inserted into the metal pipe connecting portion; An expandable / reducible retaining ring made of an elastic material is externally fitted in the space surrounded by the first sliding surface, and the first sliding surface on the metal pipe connection portion side is externally fitted to the metal pipe. Further, when the retaining ring is moved together with the metal tube in the metal tube withdrawing direction, the retaining ring is slid to reduce the diameter, thereby causing the inner peripheral edge of the retaining ring to bite the metal tube. And a function of guiding the retaining ring biting the metal tube to the second sliding surface side on the metal tube connection portion side. The second sliding surface on the metal pipe connection portion side is configured such that when the retaining ring in contact with the second sliding surface is moved in the extracting direction, the outer diameter thereof is kept constant. The action portion slides on the second sliding surface on the side of the metal pipe connection portion and hits the retaining ring that has been moved in the removing direction, and the removal of the retaining ring is performed. 2. The different pipe connection conversion joint according to claim 1, which has a function of preventing movement in a direction. 3. An outer peripheral surface of the joint main body is covered with a resin layer, and one end and the other end of the coating layer extend in the axial direction, and extend from each end. Out of each of the extended layers, a packing in close contact with the resin sleeve is held in the extended layer on the resin sleeve connecting portion side, and the extended layer on the metal tube connecting portion side is
3. The different pipe connection conversion joint according to claim 1 or 2, wherein a packing is held in close contact with the metal pipe inserted into the metal pipe connection portion. 4. The operation section of the resin sleeve connection section,
A tapered contact surface extending from one end of the second sliding surface on the resin-sleeve connection portion side, and the contact surface slides on the second slide surface of the resin-sleeve connection portion. 4. The different pipe connection conversion according to claim 1, further comprising a function of hitting the retaining ring moved in the pull-out direction and applying a clamping force in the radial direction to the retaining ring. Fittings. 5. The resin-made sleeve connecting portion has a first
It has a cylindrical surface extending from the large-diameter end of the sliding surface, is disposed in a space surrounded by the cylindrical surface, and is disposed in a space surrounded by the first sliding surface of the resin sleeve connection portion. 5. A retaining ring holding member for positioning said retaining ring concentrically with said first sliding surface.
A conversion joint for connecting different kinds of pipes according to any one of the above. 6. The retaining ring holding member elastically cooperates with the retaining ring provided in a space surrounded by the first sliding surface of the resin sleeve connecting portion in cooperation with the first sliding surface. 6. The different pipe connection conversion joint according to claim 5, which has a function of positioning the retaining ring concentrically with the first sliding surface of the resin sleeve connection portion by being sandwiched.