JP5396024B2 - Plug-in fittings - Google Patents

Description

  The present invention relates to an insertion-type pipe joint that is used for hot water supply / water supply piping and the like, and can be connected in a seal shape by simply inserting a connection pipe. More specifically, the connection pipe can be prevented from unexpectedly coming out of the joint body. It is a thing.

  As this type of plug-in type pipe joint, for example, those shown in FIGS. 5 and 6 are known (for example, refer to Patent Documents 1 and 2). The plug-in type pipe joint is reduced in diameter when a pulling force is applied to the connection pipe P inserted into the joint main body (trunk cylinder) 30 and bites into the outer periphery of the connection pipe P to restrict the connection pipe P from coming out. The retaining ring 31 includes an auxiliary ring 32 that is reduced in diameter with the diameter of the retaining ring 31 and that tightens the connecting pipe P to restrict the withdrawal of the connecting pipe P.

  According to the plug-in type pipe joint having such a configuration, when a pulling force is applied to the connected connecting pipe P, the retaining ring 31 in addition to the biting into the connecting pipe P against the pulling force. The connecting pipe P is tightened by the reduced diameter of the auxiliary ring 32 accompanying the reduced diameter of 31. Therefore, the connection pipe P can be effectively prevented from coming out.

JP 2007-162786 A JP 2007-177978 A

  However, in the plug-in type pipe joint, since the auxiliary ring 31 is incorporated so as to be superimposed on the retaining ring 31 in the inner space of the tightening nut 33 that is screwed into the distal end portion of the joint main body 30, The auxiliary ring 32 cannot be seen from the outside of the joint body 30 or the tightening nut 33, and it is difficult to confirm that the auxiliary ring 32 has been forgotten to be assembled. For this reason, there exists a possibility that it may be actually used with the auxiliary ring 32 not being incorporated. Further, since the auxiliary ring 31 is formed separately from the tightening nut 33, there is a disadvantage that the number of members of the plug-in type pipe joint and the assembling man-hour are increased accordingly.

  The present invention has been made to solve such problems, and the object of the present invention is to reduce the diameter when a pulling force is applied to the connecting pipe inserted into the joint body as described above. In a plug-in type pipe fitting that has a retaining ring that cuts into the outer periphery of the connecting pipe and restricts the withdrawal of the connecting pipe, this retaining ring uses a retaining ring holding member that holds the retaining ring against the joint body. By providing the holding member with a biting restriction function that limits the inclination of the biting teeth of the retaining ring, it is possible to effectively suppress the withdrawal of the connecting pipe, and to facilitate the confirmation of the incorporation of the retaining ring retaining member, Another object of the present invention is to provide a plug-in type pipe joint capable of reducing the number of members and the number of assembling steps and cost.

In order to make the contents of the invention easy to understand, the plug-in type pipe joint of the present invention will be described with reference to the reference numerals attached to FIGS. Between the inner cylinder 2 having a fluid communication passage communicating with the fluid passage 7 and the outer peripheral surface of the inner cylinder 2 at one end in the axial direction of the joint body 1 formed so as to penetrate in the axial direction. And an outer cylinder 3 that forms a connection pipe insertion gap 8 that receives the end of the pipe P. The inner cylinder 2 or the outer cylinder 3 is connected to the end of the connection pipe P and the inner cylinder 2 or the outer cylinder 3. In a plug-in type pipe joint in which a seal ring 4 for sealing a gap is fitted and a retaining ring 5 is provided in the outer cylinder 3, the retaining ring 5 includes an annular outer diameter ring portion 5a and the outer diameter ring portion 5a. Extending from the inner periphery of the connecting pipe P to the connecting pipe P inclining direction, and pulled to the connecting pipe P inserted into the connecting pipe insertion gap 8. The outer cylinder 3 is formed in a shape having a plurality of deformable diameter deformable teeth 5b that reduce the diameter when the pulling force is applied and bite into the outer periphery of the connection pipe P to restrict the extraction of the connection pipe P. The outer diameter ring portion 5a of the retaining ring 5 is held between the distal end portion of the retaining ring 5 and the annular retaining ring holding member 6 fitted to the distal end portion. A biting restriction projection 20 is provided to limit the inclination of the biting tooth 5b due to the pulling force applied to P, and the inner circumference 18b of the connection pipe insertion hole 18 of the retaining ring holding member 6 and the outer circumference of the opening end of the inner cylinder 2 are provided. insert guide ring 14 is fitted between the inner diameter of the inlet 18a of the connecting tube insertion hole 18 is rather smaller than the inner diameter of the inner peripheral 18b of the connecting tube insertion hole 18, the insertion guide ring 14 is pushed by the connection pipe P bite Push the tooth 5b open Are those particular having features arranged in expanded position.

  According to the above configuration, the pulling-out force is applied to the connection pipe P inserted into the connection pipe insertion gap 8 between the inner and outer cylinders 2 and 3 of the joint body 1, and the biting teeth 5b of the retaining ring 5 are reduced in diameter and connected. When the tube P is bitten and tilted, the tilt is limited by the biting restriction protrusion 20 of the retaining ring holding member 6, and the warping of the biting teeth 5b in the pulling direction is effectively restrained, so that the biting teeth 5b are warped. The resulting escape of the connecting pipe P can be effectively regulated. Moreover, since the retaining ring holding member 6 that effectively regulates the restriction of the connection pipe P being pulled out is screwed into the distal end portion of the outer cylinder 3, the presence or absence of the retaining ring holding member 6 is determined. Easy to check visually. Therefore, if the forgotten installation of the retaining ring holding member 6 is forgotten, it can be easily confirmed and the installation is promoted.

  The plug-in type pipe joint according to claim 1 is formed on the outer periphery of the distal end portion of the outer cylinder 3 as means for fitting the retaining ring holding member 6 to the distal end portion of the outer cylinder 3 as described in claim 2. A configuration including a male screw 13 and a female screw 6 a that is cut in the inner surface of the central hole of the retaining ring holding member 6 and screwed into the male screw 13 can be employed.

  The plug-in type pipe joint according to claim 1 has a shaft centered on the outer periphery of the distal end portion of the outer cylinder 3 as a means at the distal end portion of the outer cylinder 3 to which the retaining ring holding member 6 is fitted. The tapered outer peripheral surfaces 3e and 3f formed in a taper gradually narrowing outward in the direction and the inner surface of the central hole of the retaining ring holding member 6 are formed in a taper gradually narrowing outward in the axial direction. A configuration including tapered holes 6c and 6e that are taper-fitted to the outer peripheral surface of the taper in a retaining manner can be employed.

  The plug-in type pipe joint according to any one of claims 1 to 3, as described in claim 4, is inward from the inner periphery of the central hole of the retaining ring holding member 6 on the outer side in the axial direction. The flange portion 6b is projected inward in the radial direction, and the outer diameter ring portion 5a of the retaining ring 5 is formed between the overlapping surfaces of the inner end surface of the inward flange portion 6b and the outer end surface of the distal end portion of the outer cylinder 3. Can be adopted, and the biting restriction protrusion 20 is integrally projected from the inner diameter portion of the inward flange portion 6b toward the inner side in the axial direction.

  In the plug-in type pipe joint according to any one of claims 1 to 4, the inner cylinder 2 is integrally formed from one axial end of the joint body 1 outward in the axial center direction. A projecting configuration can be employed.

  In the plug-in type pipe joint according to any one of claims 1 to 5, as described in claim 6, the outer cylinder 3 is formed separately from the joint body 1, and the shaft of the joint body 1 is formed. A configuration in which the inner cylinder 2 is concentrically attached to one end in the central direction can be employed.

  In the plug-in type pipe joint according to any one of claims 1 to 6, the seal ring 4 is fitted into a seal ring fitting groove 21 provided on the outer periphery of the inner cylinder 2 as described in claim 7. The configuration can be adopted.

  According to the present invention, it is possible to effectively prevent the connection pipe from being pulled out, to facilitate the confirmation of the incorporation of the retaining ring holding member provided with the biting restriction protrusion, and to remove the biting restriction protrusion. There is an advantage that it is provided integrally with the retaining ring holding member, so that the number of members, the number of assembling steps and the cost can be reduced.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half cutaway cross-sectional view showing a plug-in type pipe joint according to an embodiment of the present invention before the connection pipe is inserted, and FIG. 2 is a half-cutaway view showing the plug-in type pipe joint of FIG. Fig. 3 is a cross-sectional view of a saddle, and Fig. 3 is a half-cut cross-sectional view showing a state in which a pulling force is applied to the connecting pipe inserted into the plug-in type pipe joint of Fig. 1.

  1 and 2, an insertion-type pipe joint showing an embodiment of the present invention includes a joint body 1, an inner cylinder 2, an outer cylinder 3, a seal ring 4, a retaining ring 5, and a retaining ring holding member 6. Etc.

  As shown in FIGS. 1 and 2, the joint body 1 is formed in a cylindrical shape from a metal such as bronze casting or plastic, and has a fluid passage 7 formed in a penetrating shape in the axial direction. The inner cylinder 2 is integrally formed so as to protrude outward in the axial direction in parallel with the central axis O of the fluid passage 7 from one end in the center direction, and the fluid passage 7 is formed in communication with the inside of the inner cylinder 2. Further, at one end in the axial direction of the joint main body 1, an outer cylinder 3 formed in a cylindrical shape with a transparent or translucent resin separately from the joint main body 1 is placed between the outer surface of the inner cylinder 2 and the polybutene. In order to form a connecting pipe insertion gap 8 for receiving an end portion of a connecting pipe P made of resin such as cross-linked polyethylene or metal or metal, it is attached concentrically with the inner cylinder 2. At the time of attachment, a female screw 9 is provided on the inner periphery of the opening of the base end portion on the inner side in the axial direction of the outer cylinder 3, and this female screw 9 is formed on the outer periphery of the base portion of the inner cylinder 2 of the joint body 1. Screw in and fix.

  On the inner periphery of the other end in the axial direction of the joint body 1, there is provided a female thread portion 11 that is screwed into a faucet or an elbow (not shown). A tool engaging portion 12 having a polygonal cross section is provided on the outer periphery of the other end portion in the axial direction of the joint body 1 to engage a tool such as a spanner or a pipe wrench.

  As shown in FIG. 1 and FIG. 2, the retaining ring 5 is a stainless steel product, and has an annular outer diameter ring portion 5a and an elastic expansion / contraction that is integrally bent on the inner periphery of the outer diameter ring portion 5a. It is formed in a shape having a plurality of biting teeth 5b that are freely deformable in diameter. Each biting tooth 5b is integrally formed so as to extend in an inclined manner from the inner circumference of the outer diameter ring portion 5a to the insertion direction of the connecting pipe P.

  The outer cylinder 3 is formed so that the outer diameter of the base end side 3a on the inner side in the axial center direction is smaller than the outer diameter of the tool engaging portion 12 of the joint body 1, and is hung on the tool engaging portion 12. The upper jaw of the pipe wrench and the teeth of the denture are prevented from coming into contact with the outer peripheral surface of the proximal end side 3a and being damaged, and the male screw 13 is formed on the outer periphery of the distal end portion 3b in the axial direction outward direction. To do. On the inner periphery of the distal end portion 3b of the outer cylinder 3, a biting tooth escape taper 3c that gradually narrows inward in the axial direction is formed. A predetermined region (part B indicated by a broken line) on the base end side 3a of the outer cylinder 3 is processed to be opaque by applying a squeezing process or by applying an opaque coating or a seal, and the opaque part B and the inner cylinder 2 A guide ring entry space 15 into which an insertion guide ring 14 to be described later enters is formed in communication with the inner back of the connection pipe insertion gap 8. The axial length of the guide ring entry space 15, that is, the axial length of the opaque portion B of the outer cylinder 3 is the same as or slightly deeper than the axial length of the insertion guide ring 14 described later. doing.

  A female screw 6a cut into the inner surface of the central hole of the annular retaining ring holding member 6 is screwed into the male screw 13 of the distal end portion 3b of the outer cylinder 3, and the outer end surface 3d of the distal end portion 3b of the outer cylinder 3 is retained. The outer diameter ring portion 5 a of the retaining ring 5 is held between the ring holding member 6 so that the tip of the biting tooth 5 b protrudes into the connecting pipe insertion gap 8. The retaining ring holding member 6 has an inward flange 6b projecting radially inward from the inner periphery of the center hole of the center hole in the axial direction on the outer end surface side, and a connecting pipe is connected to the inner diameter of the inward flange 6b. A connection pipe insertion hole 18 through which P can be inserted is opened so as to communicate with the axially outer end of the connection pipe insertion gap 8. The inner end surface of the inward flange portion 6b of the retaining ring holding member 6 is overlapped with the outer end surface 3d of the distal end portion 3b of the outer cylinder 3, and the outer diameter ring portion 5a of the retaining ring 5 is retained between the overlapping surfaces. The From the periphery of the connecting pipe insertion hole 18 of the inward flange part 6b (to limit the inclination of the biting teeth 5b due to the pulling force applied to the connecting pipe P), the biting restriction projection 20 having a conical section is directed inward in the axial direction. Projected together. The inner diameter of the inlet 18 a of the connecting pipe insertion hole 18 is smaller than the inner diameter of the inner periphery 18 b of the connecting pipe insertion hole 18.

  The retaining ring 5 is held between the distal end portion 3b of the outer cylinder 3 and the inward flange portion 6b of the retaining ring holding member 6 screwed into the distal end portion 3b, so that the connecting tube is pulled out. When a large force is applied, the biting restricting projection 20 of the retaining ring holding member 6 overlaps the biting teeth 5b of the retaining ring 5 and restrains the curling of the biting teeth 5b in the connecting tube pulling direction. Is securely held. Moreover, since the retaining ring holding member 6 screwed into the distal end portion 3b of the outer cylinder 3 can be seen from the outside, it is easy to check if the retaining ring retaining member 6 is forgotten to be assembled. Can do.

  As shown in FIG. 1, a seal ring fitting groove 21 is provided on the outer circumferential surface of the inner cylinder 2. The seal ring fitting groove 21 includes an inner circumference at the end of the connecting pipe P, an outer circumference of the inner cylinder 2, and the like. A seal ring 4 made of synthetic rubber, natural rubber, synthetic resin, or the like for sealing between the two is fitted.

When pushed by the connecting pipe P between the inner periphery 18b of the connection pipe insertion hole 18 of the retaining ring holding member 6 and the outer periphery of the open end of the inner cylinder 2, the biting tooth 5b is pushed open and inserted into a position where the diameter is increased. A guide ring 14 is inserted. The insertion guide ring 14 is a resin molded product such as nylon, and is colored differently from the color of the outer surface of the connection pipe P so that it can be clearly distinguished from the connection pipe P. For example, when the color of the connecting pipe P is white, the insertion guide ring 14 is blue, red, or green. The insertion guide ring 14 has a taper 14a that expands backward from the front end to the inner diameter portion, and the outer diameter portion has a taper 14a from the rear end to the front, contrary to the inner diameter portion. A taper 14b having a front expanding shape that gradually expands is provided to form a V-shaped cross section. Further, the insertion guide ring 14 is fluorescent / phosphorescent by applying a luminescent paint using a phosphor / phosphor or molding it with a synthetic resin containing a luminescent pigment so that the insertion can be easily confirmed even in a dark place. Can be formed. The insertion guide ring 14 is assembled between the inner periphery 18b of the connection tube insertion hole 18 and the outer periphery of the opening end portion of the inner cylinder 2 with the front end facing the inlet 18a side of the connection tube insertion hole 18 of the retaining ring holding member 6. It is.

  Next, a usage mode of the plug-in type pipe joint having the above configuration will be described. In the on-site construction, the connecting pipe P is cut to a required length. As shown in FIG. 2, the cut end of the connection pipe P is inserted into the connection pipe insertion hole 18 of the retaining ring holding member 6, and the insertion guide ring 14 is connected to the end of the connection pipe P. Is pushed inward from the front side of the connecting pipe insertion gap 8. The inserted guide ring 14 to be pushed in is pushed out by the tapers 14b of the retaining ring 5 by the outer diameter taper 14b to expand the diameter, and protrudes from the outer peripheral surface of the inner cylinder 2 by the inner taper 14a. The protrusion 4a of the seal ring 4 passes while being compressed radially inward. In this way, the taper 14a of the insertion guide ring 14 passes through the protruding portion 4a of the seal ring 4 protruding from the outer peripheral surface of the inner cylinder 2 while being compressed, so that the inner periphery of the end portion of the connecting pipe P is chamfered in advance. Even if not, the connecting pipe P can be smoothly inserted without sticking to the seal ring 4.

  Whether or not the connecting pipe P normally pushes the insertion guide ring 14 and whether the insertion guide ring 14 and the connecting pipe P normally pass through the retaining ring 5 are determined by the outer cylinder 3. It is transparent or translucent, and the insertion guide ring 14 is given a color different from that of the connection pipe P and can be easily distinguished from the connection pipe P, so that it can be easily confirmed visually from the outside. Therefore, for example, there is a problem that the connection pipe P is erroneously inserted obliquely and the insertion guide ring 14 is not normally pushed, or the insertion guide ring 14 does not normally pass through the retaining ring 5. If it occurs, this can be discovered very quickly, so that the insertion of the connecting pipe P can be immediately stopped and reinserted.

As shown in FIG. 2, when the end of the connection pipe P is completely inserted into the connection pipe insertion gap 8, the projecting portion 4 a of the seal ring 4 comes into close contact with the inner peripheral surface of the connection pipe P in a compressed manner. Thus, a state is obtained in which the space between the inner peripheral surface of the connection pipe P and the outer peripheral surface of the inner cylinder 2 is obtained, and the biting teeth 5b of the retaining ring 5 are reduced in diameter to engage with the outer peripheral surface of the connection pipe P. Thus, the connection pipe P can be prevented from being pulled out.
When the end portion of the connecting pipe P is completely inserted into the connecting pipe insertion gap 8 as shown in FIG. 2, the insertion guide ring 14 enters the guide ring in the opaque portion B of the outer cylinder 3. Although it has entered the space portion 15 and is covered with the opaque portion B and cannot be seen from the outside, the insertion guide ring 14 does not completely enter the guide ring entry space portion 15 when the insertion is insufficient. Therefore, it can be easily confirmed whether or not the end of the connection pipe P is completely inserted to the back of the connection pipe insertion gap 8. Accordingly, it is possible to prevent poor insertion or insufficient insertion of the connecting pipe P that causes water leakage.

  Next, as shown in FIG. 3, when a pulling force is applied to the connecting pipe P connected to the joint body 1, the biting teeth 5 b of the retaining ring 5 are reduced in diameter and bite into the outer peripheral surface of the connecting pipe P. The inclination angle of the biting tooth 5b with respect to the axial direction is increased. At this time, the biting teeth 5b of the retaining ring 5 abut against the biting restriction protrusions 20 integral with the retaining ring holding member 6, so that the force due to the inclination of the biting teeth 5b is received by the biting restriction protrusions 20 to The restricting protrusion 20 suppresses excessive biting of the biting teeth 5b into the connecting pipe P, and restrains the warpage of the biting teeth 5b. Therefore, the connection pipe P can be effectively prevented from coming out.

In the above embodiment, as means for fitting the retaining ring holding member 6 to the distal end portion of the outer cylinder 3, the male screw 13 formed on the outer periphery of the distal end portion of the outer cylinder 3 and the inner surface of the central hole of the retaining ring retaining member 6 Although the structure which consists of the internal thread 6a cut and screwed by the external thread 13 is employ | adopted, it is not restricted to this. Instead, as shown in FIG. 4, as a means for fitting the retaining ring holding member 6 to the distal end portion of the outer cylinder 3, a taper gradually narrowing outward in the axial direction on the outer periphery of the distal end portion of the outer cylinder 3. The first and second tapered outer peripheral surfaces 3e and 3f formed on the inner surface of the central hole of the retaining ring holding member 6 and the first and second tapered portions gradually tapered outward in the axial direction. A configuration including first and second tapered holes 6c and 6e that are taper-fitted to the outer peripheral surfaces 3e and 3f in a retaining manner can also be employed. In this case, the inner surface of the central hole of the retaining ring holding member 6 includes a first tapered hole 6c and a second tapered hole 6e formed at the axially outer side end of the first tapered hole 6c. A retaining step portion 6d is formed between the outer periphery of the outer cylinder 3 and the outer periphery of the distal end portion of the outer cylinder 3 is a first tapered outer peripheral surface 3e and an axial center of the first tapered outer peripheral surface 3e. A retaining step portion 3g can be formed between the second tapered outer peripheral surface 3f formed at the outer end in the direction and formed into a sawtooth waveform in cross section.
Moreover, in the said Example, as a means to attach the base end part of the outer cylinder 3 to the axial direction one end part of the coupling main body 1, the internal thread 9 is provided in the opening inner periphery of the base end part of the axial direction inner side of the outer cylinder 3. The female screw 9 is screwed into a male screw 10 formed on the outer periphery of the base portion of the inner cylinder 2 of the joint body 1. Instead of this, as shown in FIG. A lip 3h is provided inwardly on the inner periphery of the opening at the base end on the inner side in the direction, and the lip 3h is press-fitted into a groove 1a formed on the outer periphery of the base portion of the inner cylinder 2 of the joint body 1 for engagement. Can be fixed together.

Further, in the above embodiment, the seal ring 4 is fitted on the outer periphery of the inner cylinder 2, but instead, the seal ring 4 is fitted on the inner circumference of the outer cylinder 3 so that the end of the connecting pipe P and the outer cylinder are fitted. 3 can be sealed.
Furthermore, in the above-described embodiment, the outer cylinder 3 has a predetermined region (portion indicated by a broken line) at the base end portion of the outer cylinder 3 made opaque, and the other is formed transparent or translucent so that the insertion guide ring 14 Although the insertion state of the end of the connecting pipe P is easily visible from the outside, the present invention is not limited to this, and the outer cylinder 3 may be formed entirely opaque.

  The joint body 1 is not limited to the socket type shown in the illustrated example, and can be similarly applied to any case such as an elbow or a T type.

It is a half notched cross-sectional view showing the plug-in type pipe joint of one embodiment of the present invention in a state before inserting the connecting pipe. FIG. 2 is a half cutaway cross-sectional view showing the plug-in type pipe joint of FIG. 1 in a state after the connection pipe is inserted. FIG. 2 is a half-broken sectional view showing a state in which a pulling force is applied to a connecting pipe inserted into the plug-in type pipe joint of FIG. 1. It is a partial cross section figure which shows the insertion type pipe joint of another Example. It is a half notched cross-sectional view showing the plug-in type pipe joint of the conventional example in a state before inserting the connecting pipe. It is a half notched cross-sectional view showing the plug-in type pipe joint of another conventional example in a state before inserting the connecting pipe.

P Connection pipe 1 Joint body 2 Inner cylinder 3 Outer cylinder 3e, 3f Tapered outer peripheral surface 4 Seal ring 5 Retaining ring 5a Outer ring part 5b Biting tooth 6 Retaining ring holding member 6a Female thread 6b Inward flange part 6c, 6e Taper Hole 7 Fluid passage 8 Connection pipe insertion gap 13 Male screw 18 Connection pipe insertion hole 18a Inlet 18b Inner circumference 20 Biting restriction protrusion 21 Seal ring fitting groove

Claims (7)

Connected between an inner cylinder having a fluid communication path communicating with the fluid path and an outer peripheral surface of the inner cylinder at one axial end of the joint body in which a fluid path is formed so as to penetrate in the axial direction. An outer cylinder that forms a connection pipe insertion gap for receiving an end of the pipe, and seals between the end of the connection pipe and the inner cylinder or the outer cylinder on the inner cylinder or the outer cylinder. In the plug-in type pipe joint that is fitted with a sealing ring of
The retaining ring has an annular outer diameter ring portion, and extends from the inner periphery of the outer diameter ring portion so as to incline in the connection tube insertion direction, and pulls out the connection tube inserted into the connection tube insertion gap. Is formed into a shape having a plurality of bite teeth that are deformable to expand and contract to reduce the diameter when acted on, and bite into the outer periphery of the connection pipe to regulate the extraction of the connection pipe,
An outer diameter ring portion of the retaining ring is held between a distal end portion of the outer cylinder and an annular retaining ring holding member fitted to the distal end portion. A biting restriction protrusion is provided to limit the inclination of the biting tooth due to the pulling force applied to the connecting pipe;
An insertion guide ring is inserted between the inner periphery of the connection pipe insertion hole of the retaining ring holding member and the outer periphery of the opening end of the inner cylinder,
The inlet of the inner diameter of the connection pipe insertion hole rather smaller than the inner circumference of the inner diameter of the connection pipe insertion hole,
An insertion-type pipe joint, wherein the insertion guide ring is disposed at a position where the bite teeth are pushed open when the insertion guide ring is pushed in by the connecting pipe .   The means for fitting the retaining ring holding member to the distal end portion of the outer cylinder includes a male screw formed on the outer periphery of the distal end portion of the outer cylinder, and an inner surface of the center hole of the retaining ring retaining member and screwed into the male screw. The plug-in type pipe joint according to claim 1, comprising a female screw to be joined.   The means for fitting the retaining ring holding member to the distal end portion of the outer cylinder includes a tapered outer peripheral surface formed in a taper that gradually narrows outward in the axial direction on the outer periphery of the distal end portion of the outer cylinder, 2. The insertion according to claim 1, comprising a tapered hole formed in a taper that gradually narrows outward in the axial direction on the inner surface of the central hole of the retaining ring holding member, and that is taper-fitted to the outer peripheral surface of the taper in a retaining manner. Type pipe fittings.   An inward flange is projected radially inward from the inner circumference of the center hole of the retaining ring holding member on the axially outer end surface side, and the inner end surface of the inward flange and the tip of the outer cylinder The outer diameter ring portion of the retaining ring is held between the overlapping surfaces with the outer end surface of the portion, and the biting restriction projection is integrally projected from the inner diameter portion of the inward flange portion toward the axially inward direction. The insertion-type pipe joint according to any one of claims 1 to 3.   The plug-in type pipe joint according to any one of claims 1 to 4, wherein the inner cylinder is integrally formed so as to protrude outward in the axial center direction from one axial end portion of the joint body.   The said outer cylinder is formed separately from the said joint main body, and is attached to the axial direction one end part of this joint main body concentrically with the said inner cylinder. Plug-in type pipe fittings.   The plug-in type pipe joint according to any one of claims 1 to 6, wherein the seal ring is fitted in a seal ring fitting groove provided on an outer periphery of the inner cylinder.

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