JP2001349481A - Sleeve type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint not causing the variations in bonding strength at simple work execution, easily confirmed after the execution of work, and facilitating the piping work execution with a comparatively small tool. SOLUTION: In this sleeve type pipe joint composed of a joint body having a cylindrical part to be inserted into an inner periphery of a pipe to be connected, an approximately cylindrical ring having an inner diameter larger than an outer diameter of the pipe, and a cylindrical sleeve fitted between an inner peripheral surface of the ring and an outer face of the pipe, inserting the cylindrical part of the joint body into the inner periphery of the pipe, reducing the diameter of the sleeve on the inner peripheral face of the ring, and holding the pipe between the cylindrical part of the joint body and the sleeve to connect the pipe, the joint body, the ring and the sleeve are assembled in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a resin pipe or a thin metal pipe, and more particularly, to a joint for connecting a pipe by press-fitting a sleeve which is a component of the pipe joint in a pipe axial direction. It is about.

[0002]

2. Description of the Related Art Conventionally, there are various joining methods for resin pipes such as polyethylene, polybutene, and polypropylene as fluid transport pipes such as gas pipes and water pipes. A widely used joining method is to screw a nut onto a joint body. There is a mechanical type pipe joint that seals and connects by compressing a packing or a biting ring mounted between a joint body and a nut. In this connection method of the joint, a biting ring or packing is attached to the outer peripheral surface of the pipe end, and the joint body and the nut are tightened with a wrench.

[0003]

The above-mentioned conventional mechanical pipe joint has a drawback in that it is not possible to confirm whether or not the pipe has been inserted correctly after the completion of the construction, and further, it is also necessary to confirm the degree of tightening of the nut. It was difficult, and the performance of the pipe connection was likely to vary. Therefore, there were insufficient insertion of the tube, insufficient tightening of the nut, or incorrect mounting of the bite ring. In this case, the only means to check the quality of the construction after construction is a leak test, and even if it passes the short-term leakage test immediately after construction, the pipe may fall out or leak during long-term use . SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to provide a pipe joint that can be easily checked after installation without a variation in joint strength by a simple operation, and that can be easily installed with a relatively small tool. To provide.

[0004]

The gist of the present invention is to provide a joint body having a cylindrical portion inserted into the inner periphery of a pipe to be connected, and a substantially cylindrical body having an inner diameter larger than the outer diameter of the pipe. Ring, and a cylindrical sleeve that fits between the inner peripheral surface of the ring and the outer surface of the tube.The cylindrical portion of the joint body is inserted into the inner periphery of the tube, and the sleeve is A pipe joint whose diameter is reduced on an inner peripheral surface of a ring, and a pipe is connected by sandwiching a pipe between a cylindrical portion and a sleeve of the joint main body, wherein the joint main body, the ring, and the sleeve are assembled in advance. A sleeve type pipe joint characterized by the above-mentioned.

[0005] A sleeve type pipe joint according to the above, wherein the rigidity of the sleeve is smaller than the rigidity of the ring. In the above, there is provided a sleeve-type pipe joint, wherein a locking portion for locking a ring or a sleeve is provided at a base of a cylindrical portion of the joint body. In the above, there is provided a sleeve-type pipe joint in which a small-thick portion and a large-thick portion are provided in the sleeve, and the ring is attached to an outer peripheral position of the small-thick portion of the sleeve. In the above, the sleeve is inserted between the tube and the ring to reduce the diameter of the sleeve, or the ring is moved in the axial direction on the outer peripheral surface of the sleeve attached to the outer peripheral surface of the tube to reduce the diameter of the sleeve. It is a sleeve type pipe joint characterized by the above-mentioned.

[0006] In the above, a protrusion for engaging the joint body is provided on the inner peripheral side of one end of the ring so as to bend in the axial or radial direction by utilizing elastic deformation, and provided on the outer periphery of the joint body. A sleeve type pipe joint which is attached to a locking portion. In the above, there is provided a sleeve-type pipe joint, wherein a protrusion is provided on the inner periphery of the distal end of the sleeve, and the projection is attached to the engaging portion of the joint body by utilizing elastic deformation of the distal end of the sleeve. In the above, there is provided a sleeve-type pipe joint, wherein a cutout portion in an axial direction is provided on a side of the ring or the sleeve that is engaged with the joint body.

In the above, there is provided a sleeve-type pipe joint characterized in that a flange is provided on the side of the thick wall of the sleeve so that the end face of the ring comes into contact with the flange when connection with the pipe is completed. In the above, before inserting the cylindrical portion of the joint main body into the pipe, the sleeve and the ring are prevented from relatively compressively moving in the axial direction even when an external force of a certain load or less is applied to the end face of the sleeve or the ring. It is a sleeve type pipe joint characterized by the following. In the above, there is provided a sleeve-type pipe joint, wherein a projection is provided on an outer periphery of a distal end on a small diameter side of the sleeve, and the projection is engaged with a notch provided in the ring.

[0008] In the above, there is provided a sleeve-type pipe joint, wherein a projection provided on an outer periphery of the sleeve is engaged with an inner periphery of the ring to assemble. In the above, there is provided a sleeve-type pipe joint, wherein a step is provided on the outer periphery of the joint main body, and the end face of the ring coincides with the step when the connection with the pipe is completed. In the above, after inserting the cylindrical portion of the fitting into the inner surface of the pipe, the sleeve is moved by moving the fitting body and the ring or the sleeve and the ring relatively in the pipe axis direction without shifting the relative position of the sleeve and the pipe. A sleeve-type pipe joint characterized in that the diameter is reduced.

[0009]

According to the present invention, the ring and the sleeve are locked so as not to be easily detached from the joint body, so that the joint and the pipe do not come off due to vibration during the transportation by the vehicle. The work is performed by inserting the cylindrical portion of the joint into the inner peripheral surface of the pipe end, press-fitting the sleeve or ring, and reducing the diameter of the sleeve, thereby making the connection. In addition, since the ring or the sleeve is mounted on the joint body in advance, there is no mounting error of parts and no construction error occurs.

Further, since the rigidity of the sleeve is smaller than the rigidity of the ring, the sleeve can be easily deformed, compressing the outer peripheral surface of the tube, and obtaining a large clamping force. Further, by providing a locking portion for locking the ring or the sleeve at the base of the cylindrical portion at the end of the joint body, the ring or the sleeve can be mounted on the joint body so as to be located on the outer periphery of the cylindrical portion. In addition, the sleeve is provided with a small thick part and a large thick part, and the ring is attached to the outer periphery of the small thick part of the sleeve. Then, a tube is sandwiched between the sleeve and the main body cylindrical portion.

The ring or the sleeve is attached so that the ring or the sleeve is not easily detached from the joint main body by engaging the protrusion provided on the inner periphery of one end of the ring or the sleeve with the engaging portion of the joint main body by utilizing elastic deformation. You can do it. In addition, since the notch is provided at a portion where the ring or the sleeve is locked to the joint main body, the ring or the sleeve is easily elastically deformed when mounted on the main body, thereby facilitating the mounting. In addition, it can be visually confirmed from the outside of the joint that the notch is securely inserted into the end of the pipe to be connected up to the predetermined cylindrical portion. Also, by inserting the flange provided on the sleeve to the position where the end face of the ring abuts, it is possible to check the insertion completion position of the sleeve with respect to the joint main body, it is possible to reliably check the completion of insertion, and to prevent construction defects such as insufficient insertion etc. I can do it.

Further, since the relative position between the ring and the sleeve is not changed even when a thrust of a certain load or less is applied to the joint end surface before the pipe is inserted, the sleeve receives an external force during transportation of the joint and the like, so that the sleeve is not connected before the connection. It is possible to prevent a problem that the tube cannot be inserted due to reduced diameter. Also, when attaching the sleeve to the ring attached to the main body, make sure that the protrusion provided on the outer periphery of the tip of the sleeve is locked to the step or notch provided on the inner periphery of the ring so that it does not easily come off. Can be done. The ring can be mounted on the sleeve mounted on the main body so that the inner circumference of the ring is not easily disengaged by engaging the inner circumference of the ring with a projection provided on the outer circumference of the sleeve.

Further, by inserting the ring to the position where the step provided on the outer periphery of the joint main body and the end face of the ring coincide with each other, it is possible to check the position where the ring has been completely inserted into the joint main body, and to prevent poor installation such as insufficient insertion. Also, when connecting the pipe, the sleeve is reduced in diameter after inserting the pipe into the joint without shifting the relative position of the sleeve and the pipe, so that frictional resistance between the sleeve and the pipe does not occur and the ring moves. Required thrust can be made relatively small.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a state in which a pipe to be connected to a pipe joint according to an embodiment of the present invention has been inserted and immediately before pushing of a sleeve is started. Reference numeral 10 denotes a pipe joint, which includes a joint body 11, a ring 20, and a sleeve 3.
0. 40 is a tube to be connected. The end of the joint body 11 is a cylindrical portion 12 that fits into the inner diameter of the pipe 40, and a plurality of ridges 13 having a sawtooth cross section are provided on the outer peripheral surface thereof. Further, a tube end contact surface 14 is provided at the back of the cylindrical portion 12. At one end of the ring 20, two notches 21 are provided on the circumference, and a projection 22 is provided on the inner periphery of the tip on the side of the notch 21. Inlaid.

As shown in FIG. 2, the sleeve 30 has a cylindrical shape as a whole, and is provided with two projections 31 extending to the end and extending therefrom, and two split portions 33 between them. The other end is provided with a collar 32. As shown in FIG. 1, the protrusion 31 extending to the tip
Locked to 1. FIG. 3 shows a connection completed state in which the sleeve 30 is pushed into the inner surface of the ring 20 and the outer surface of the tube 40 is compressed. When the end face of the collar 32 on the distal end side of the sleeve 30 is pushed into the ring 20 using a tool or the like, the small-thickness portion at the tip is inserted deeper while reducing the diameter along the hollow conical portion 22 of the ring. The pipe 40 is reduced in diameter and pressed against the outer peripheral surface of the cylindrical portion 12 of the joint main body to clamp it.
A protruding ridge 13 provided on the outer surface of the cylindrical portion 13 bites into the inner surface of the tube 40 and is prevented from falling off and sealed.

In order to sufficiently exert the function of joining the pipes, it is desirable that the rigidity of the ring 20 and the body cylindrical portion 12 be larger than the rigidity of the pipe 40 and the sleeve 30. For example, as shown in FIG. 2, a notch 33 is provided at the distal end of the sleeve 30, and the rigidity is reduced so that the sleeve 30 can be easily reduced in diameter when inserted into the hollow conical portion 22 of the ring 20. And good. The feature of this embodiment is that the ring 20 and the sleeve 30 are locked to the joint main body 11 by the locking portions and are assembled in advance. Thus, the operation for connecting the pipe 40 only requires inserting the pipe 40 into the joint cylindrical portion 12 and pushing the sleeve 30 into the ring 20. Therefore, the work of assembling the parts by the plumbing contractor can be omitted, and the assembling work of the parts does not occur. In addition, whether or not the insertion of the pipe into the joint has been reliably performed can be confirmed by visually checking the end of the pipe 40 against the pipe end contact surface 14 from the outside by the cut portion 21 provided on the ring 20.
Insufficient insertion of the tube 40 into the cylindrical portion 12 can be eliminated. Further, the completion of the pushing operation of the sleeve 30 can be confirmed by inserting the sleeve 30 until the flange 32 of the sleeve 30 abuts on the end of the ring 20, and the connection after the installation is easy.

FIG. 4 is an external view showing an example of an insertion tool 50 for inserting the sleeve 30, showing an example of a manual type. Not only the manual type but also an electric type or a hydraulic type may be used. FIGS. 5 and 6 show another embodiment of the present invention. A different point from the embodiment of FIG. 1 is that an engagement portion 301 with the ring 200 is provided on the outer peripheral side of the sleeve 300.
A protrusion 302 is provided on the inner peripheral side of the distal end of the ring and is locked to the ring 200. As shown in FIG. 6, the sleeve 300 is provided with a cylindrical locking portion 301 which covers the outer periphery of the ring, and four cutout portions 303 are provided on the circumference. Lock to 200.

FIG. 7 shows still another embodiment of the present invention, and is a partial sectional view showing a state before connecting a pipe 40 to be connected. The difference from the embodiment of FIG. 1 is that a projection 311 is provided on the outer periphery of the sleeve 310. The feature of this embodiment is that the joint in which the components are assembled is not disassembled during transportation to the piping site, and even if external force is applied to the sleeve 310 in the pushing direction into the ring, 15 kgf (147 N).
If it is less than about, the protrusion 311 provided on the outer surface of the sleeve contacts the end face of the ring 20, and the sleeve 31 is inserted into the ring 20.
The dimension of the projection 311 was set so that 0 did not enter. This can prevent the sleeve 310 from being reduced in diameter. Therefore, at the time of connection work with the pipe, the pipe 40 is connected to the joint cylindrical portion 12.
Can be easily plugged into When the sleeve 310 is inserted into the ring 20 using the sleeve insertion tool, the thrust is 80 to 1 for a resin tube having an outer diameter of 10 to 25 mm.
It is about 00Kgf (784-980N). It should be noted that, besides providing the protrusion 311 on the sleeve as in this embodiment, by setting the taper angle of the hollow tapered surface 22 of the ring 20 or the rigidity of the sleeve 310 to an appropriate value, 1
The sleeve can not be inserted with an external force of about 5 kgf or less, and can be provided so as not to reduce the diameter.

FIGS. 8 and 9 show still another embodiment of the present invention. FIG. 8 shows a state where a tube to be connected is inserted, and FIG. 9 is an external view of a sleeve 320 of FIG. is there. 1 and 2 of the above embodiment is that the sleeve 3
A groove 322 for eliminating the large-diameter portion is provided on the back side of the projection 321 at the tip. According to this shape, when the sleeve 320 is formed by resin injection molding, injection molding can be performed by opening and closing the mold in the axial direction of the tube, and the structure of the mold is simplified. This eliminates the need to use a mold opening / closing slide mechanism that is partially perpendicular to the opening / closing direction of the molding die.
The molding die can be simplified, a multi-cavity molding die can be formed, and the molding can be easily performed, for example, by shortening the extraction time after molding.

FIGS. 10 and 11 show still another embodiment of the present invention. FIG. 10 shows a state before the connection pipe is inserted and the sleeve 330 is inserted, and FIG. 11 is an external view of the sleeve 330. The difference from the embodiment of FIGS. 5 and 6 is that the sleeve 3
A notch 303 is provided on the back side of a projection 302 provided on the inner periphery of the distal end side of the locking portion 301 of FIG. By adopting this shape, the sleeve 320 shown in the embodiment of FIG.
In the same manner as described above, injection molding can be easily performed only by opening and closing the molding die in the tube axis direction, and the molding die can be simplified, a multi-cavity molding die can be formed, and molding can be easily performed.

FIG. 12 shows still another embodiment of the present invention.
FIG. 6 is a partial cross-sectional view showing a state before connection is started in a state where the connection pipe 40 is inserted into the cylindrical portion 12. The difference from the above-described embodiment is that the inner projection 342 of the locking portion 341 extending toward the distal end of the sleeve 340 is locked in the groove 15 of the main body 11, and the ring 210 mounted on the outer peripheral surface of the sleeve 340 is slid toward the end. That is, the diameter of the sleeve 340 is reduced. The ring 210 is a projection 34 provided on the outer surface of the locking portion 341 of the sleeve.
3 engages with the thick portion of the sleeve.
FIG. 13 is an external view showing the sleeve 340 of FIG.
A protrusion 342 that locks into the main body groove 15 is provided inside the locking portion 341 extending to the distal end side of the sleeve 340, and is locked with the main body 11. A flange 344 is provided at the opposite end.

After inserting the tube 40 into the cylindrical portion as shown in FIG.
The ring 210 is moved toward the thick portion of the sleeve 340 until it comes into contact with the flange 344 as shown in FIG. The end face 211 of the ring 210 contacts the flange 344 of the sleeve 340, and the connection of the tube 40 is completed. As the ring 210 moves from the small-diameter portion to the large-diameter portion of the sleeve 340, the diameter of the sleeve 340 is reduced, and accordingly, the tube 40 is reduced in diameter and pressed against the outer peripheral surface of the main body cylindrical portion 12. And the tube is convex 13
And the tube 40 is prevented from slipping off and sealed. A feature of this embodiment is that the sleeve 34 is
0 is a point that does not move. Therefore, when the ring 210 is slid and connected using a tool or the like, no frictional resistance is generated on the outer peripheral surface of the tube 40, and the frictional portion is formed on the sleeve 340.
Since there is only the outer peripheral surface and the inner peripheral surface of the ring 210, and no frictional resistance is generated between the outer peripheral surface of the tube 40 and the inner peripheral surface of the sleeve, the thrust required to move the ring 210 can be reduced. Notch 34 provided at the tip of sleeve 340
5, the rigidity of the sleeve can be appropriately reduced, the diameter can be easily reduced, and the thrust for sliding the ring at the time of pipe connection can be appropriately reduced.

FIG. 15 shows still another embodiment of the present invention, in which a pipe 40 to be connected is inserted. The difference from the embodiment of FIG.
The ring 220 is slid toward the joint main body 11 by reversing the positional relationship between the flange 351 and the ring 220.
The point is that the diameter is reduced and the connection is made. The ring 220 is locked by a protrusion 352 provided on the outer peripheral end side of the sleeve 350 so as not to come off. Also in this embodiment, friction resistance does not occur on the outer peripheral surface of the pipe 40 as in the previous embodiment, and connection can be easily made.

FIG. 16 shows still another embodiment of the present invention, in which a pipe 40 to be connected is inserted. The difference from the previous embodiment is that
Is attached to the main body 120, the ring 230 is slid with respect to the main body 120, the diameter of the sleeve 360 is reduced, and the tube 40 is connected. At the time of connecting the pipe, the sleeve 360 does not move with respect to the pipe 40 and no sliding frictional resistance is generated on the surface of the pipe, so that the same effect as in the embodiment of FIGS. FIG. 17 is an external view showing the sleeve 360 of FIG. The large-diameter slit 361 also serves as a window for confirming insertion of a tube, and the small-diameter slit 362 is for reducing rigidity so that the sleeve can be easily reduced in diameter. FIG. 18 shows a state in which the ring 230 is moved toward the main body 120 by using a ring pushing tool or the like from the state of FIG. 16 and the end face of the ring 230 is pushed until it comes into contact with the flange 121 of the main body 120 to connect with the pipe 40. Indicates a state in which has been completed.
At this time, the distal end surface 231 of the ring 230 is
Pushing in until it matches 22 makes it easy to confirm connection completion.

FIG. 19 shows still another embodiment of the present invention, in which a pipe to be connected is inserted.
The difference from the embodiment of FIG. 16 is the locking structure between the ring 240 and the main body 110.
Is provided, and a claw 112 provided on the inside of the tip of the protrusion is engaged with a ridge 241 provided on the outer periphery of the end of the ring 240. In the case of this embodiment, as in the embodiment of FIGS.
Is reduced in diameter. The sleeve 360 is the same sleeve as the embodiment of FIGS. 16 and 17, and the state of the completion of the connection is shown in FIG.
From the state of FIG. 19, the ring 240 is slid toward the main body 110 using a pushing tool or the like to
Forty step portions 242 are provided on the end surface 11 of the extension protrusion 111 of the main body.
By abutting on 3, the sleeve is reduced in diameter, and the tube 40 is compressed to the cylindrical portion 12 of the main body to complete the connection.

FIG. 21 shows still another embodiment of the present invention.
The state where the pipe 40 to be connected is inserted is shown. The difference from the embodiment of FIG.
And a locking structure. A plurality of serrations 131 for locking the ring are provided on the outer periphery of the main body 130, and the cutting edge at the tip of the locking projection 231 of the ring 230 is formed by a plurality of protrusions 1 on the main body.
31 is engaged with the groove. At the time of pipe connection, the ring 230 is pressed toward the main body 130 using a tool or the like, and the cutting edge of the tip of the locking projection 231 of the ring 230 jumps over the plurality of ridges 131 of the main body 130 as shown in FIG. And move in the axial direction. The advantage of this embodiment is that the ring 23
0 can be prevented from loosening. Also, during the transfer of the joint to the piping site, the ring 23
0 is not disassembled, and even if external force in the pushing direction is applied to the ring 230 at the end of the joint, if the external force in the pushing direction is about 15 kgf or less, the cutting edge of the locking projection 231 of the ring 230 does not climb over the ridge 131 of the main body. By setting the dimensions, the sleeve 360 and the ring 230 do not relatively move, so that the sleeve 360 does not contract in diameter, and therefore, it is easy to insert the pipe 40 into the joint cylindrical portion 12 at the time of connecting work. Note that the same effect can be obtained even if a plurality of convex stripes are provided on the ring 230 side. Further, the plurality of ridges may be screws.

In any of the above embodiments, the inner peripheral surface of the ring and the outer peripheral surface of the sleeve are strongly pressed by using a tool or the like, thereby reducing the diameter of the sleeve and compressing the outer peripheral surface of the tube to form a contact with the outer peripheral surface of the cylindrical portion. Since the rigidity of the ring is greater than the rigidity of the sleeve, it is effective in increasing the clamping force of the tube. That is, it is effective to provide a notch in the sleeve to facilitate deformation, or to use a material having a small elastic coefficient for the sleeve and a material having a large elastic coefficient for the ring.

[0028]

As described above, according to the present invention, the fitting parts are pre-assembled, the piping work can be easily performed by a simple operation, there is no variation in joint strength, and the connection after the work can be easily confirmed. It is a pipe joint that does not cause construction errors.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view just before connection showing an embodiment of the present invention.

FIG. 2 is an external view showing the sleeve of FIG.

FIG. 3 is a partial cross-sectional view after the pipe connection of FIG. 1 is completed.

FIG. 4 is an external view showing a use state of a tool according to the present invention.

FIG. 5 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

FIG. 6 is an external view showing the sleeve of FIG. 5;

FIG. 7 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

FIG. 8 is a partial cross-sectional view immediately before connection showing another embodiment of the present invention.

FIG. 9 is an external view showing the sleeve of FIG. 8;

FIG. 10 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

FIG. 11 is an external view showing the sleeve of FIG. 10;

FIG. 12 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

FIG. 13 is an external view showing the sleeve of FIG.

FIG. 14 is a partial cross-sectional view after the pipe connection of FIG. 12 is completed.

FIG. 15 is a partial sectional view just before connection showing another embodiment of the present invention.

FIG. 16 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

FIG. 17 is an external view showing the sleeve of FIG. 16;

FIG. 18 is a partial cross-sectional view after the completion of the pipe connection in FIG. 16;

FIG. 19 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

20 is a partial cross-sectional view of FIG. 19 after completion of the pipe connection.

FIG. 21 is a partial cross-sectional view just before connection showing another embodiment of the present invention.

FIG. 22 is a partial cross-sectional view after the pipe connection in FIG. 21 is completed.

[Explanation of symbols]

10 Fittings 11, 110,
120 Joint body 12 Cylindrical part 15 Locking recess 20, 200, 210, 220, 230, 240, 25
0 ring 22 protrusion 31 protrusion 30, 300, 310, 320, 330, 340, 35
0, 360 Sleeve 32 Flange 33 Cutting part 40 Pipe 50 Pressing tool

Claims (14)

[Claims] 1. A joint body having a cylindrical portion to be inserted into the inner periphery of a pipe to be connected, a substantially cylindrical ring having an inner diameter larger than the outer diameter of the pipe, and an inner circumference of the ring A cylindrical sleeve that fits between the surface and the outer surface of the tube;
The cylindrical portion of the joint body is inserted into the inner periphery of the tube, the sleeve is reduced in diameter at the inner peripheral surface of the ring, and the tube is sandwiched and connected between the cylindrical portion of the joint body and the sleeve. A pipe joint, wherein the joint body, a ring, and a sleeve are assembled in advance. 2. The sleeve type pipe joint according to claim 1, wherein the rigidity of the sleeve is smaller than the rigidity of the ring. 3. The sleeve-type pipe joint according to claim 1, further comprising a locking portion for locking a ring or a sleeve at a base of the cylindrical portion of the joint body. 4. The sleeve-type pipe joint according to claim 1, wherein a small-thick portion and a large-thick portion are provided on the sleeve, and the ring is attached to an outer peripheral position of the small-thick portion of the sleeve. 5. The sleeve is inserted between a tube and a ring to reduce the diameter of the sleeve, or the ring is axially moved on the outer peripheral surface of the sleeve attached to the outer peripheral surface of the tube to contract the sleeve. The sleeve-type pipe joint according to claim 1, wherein the diameter is a diameter. 6. An engagement member provided on an inner peripheral side of one end of the ring, which is provided on the outer periphery of the joint body by bending the protrusion portion to be engaged with the joint body in an axial direction or a radial direction by utilizing elastic deformation. The sleeve type pipe joint according to any one of claims 1 to 5, wherein the sleeve type pipe joint is mounted on a stop portion. 7. A projection is provided on the inner periphery of the distal end of the sleeve,
7. The sleeve-type pipe joint according to claim 1, wherein the sleeve-type pipe joint is mounted on the engaging portion of the joint body by utilizing elastic deformation of a sleeve tip. 8. The sleeve-type pipe joint according to claim 1, wherein an axial cutout is provided on a side of the ring or the sleeve that is engaged with the joint body. 9. The sleeve mold according to claim 1, wherein a flange is provided on a side of the large thickness portion of the sleeve so that the end face of the ring abuts on the flange when connection with the pipe is completed. Pipe fittings. 10. Before the cylindrical portion of the joint body is inserted into the pipe, the sleeve and the ring are prevented from relatively compressively moving in the axial direction even when an external force of a certain load or less is applied to the end face of the sleeve or the ring. 10. The method according to claim 1, wherein:
The described sleeve type pipe joint. 11. The sleeve-type pipe joint according to claim 1, wherein a projection is provided on an outer periphery of a tip on a small diameter side of the sleeve, and the projection is engaged with a notch provided in the ring. 12. The sleeve type pipe joint according to claim 1, wherein a projection provided on an outer periphery of said sleeve is engaged with an inner periphery of said ring for assembly. 13. The joint according to claim 1, wherein a step is provided on the outer periphery of the joint body so that the end face of the ring coincides with the step when connection with the pipe is completed.
The sleeve-type pipe joint according to item 1. 14. After inserting the cylindrical portion of the joint into the inner surface of the tube, by moving the joint body and the ring or the sleeve and the ring relatively in the axial direction of the tube without shifting the relative position of the sleeve and the tube. 14. The sleeve type pipe joint according to claim 1, wherein a diameter of the sleeve is reduced.