JP2002039467A - Sleeve type pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint permitting easy connecting work, facilitating the identification of connection after construction without causing the dispersion of connecting strength, and allowing easy piping construction using a small tool. SOLUTION: This sleeve type pipe joint 10 comprises a joint body 11 having a core portion 12 to be inserted and supported into the inner face of a connection pipe 30 and a diameter shrinking member 20 to be mounted on the outer face of the connection pipe externally inserted into the core portion 12 for shrinking the diameter of the connection pipe, the diameter shrinking member having a diameter-shinkable sleeve portion 1, a thin shearing portion 25 and an annular portion 24 to be compressed in the axial direction, sheared at the shearing portion and fitted at its inner face into the outer face of the sleeve portion for shrinking the diameter of the sleeve. The diameter shrinking member 20 can be locked to the joint body 11. The joint body 11 and the diameter shrinking member 20 can be locked with a locking protrusion 23 formed on the sleeve portion and a locking protrusion 63 on the annular portion, respectively. The sleeve portion has a cut-off 27 at a portion on its circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting a resin pipe or a thin metal pipe, and more particularly, a sleeve type joint for connecting a pipe by compressing a reduced diameter member in the axial direction of the pipe.

[0002]

2. Description of the Related Art Conventionally, resin pipes such as polyethylene and polybutene have been used as fluid transport pipes such as gas pipes and water pipes, and there are various types of joints for connecting the resin pipes. A mechanical type pipe joint is often used in which a nut is screwed into the pipe and a packing or a bite ring mounted between the joint body and the nut is compressed to be connected.

[0003]

In the above-mentioned pipe joint, a pipe having a nut, packing, biting ring, etc. mounted on the outer surface of the end of the connecting pipe is inserted into the joint body, and the nut is screwed into the joint body. It is connected by tightening. For this reason, it is difficult to check the tightening of nuts, check the assembly of parts, and check the insertion of pipes.
In addition, the joint itself became large, and there was also a problem in workability such as tightening a nut with a wrench. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to provide a pipe joint that can easily perform connection work, has no variation in connection strength, can easily check connection after construction, and can easily perform piping with a small tool. To provide.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a joint body having a core portion which is inserted into and supported by the inner surface of a connecting pipe, and which is connected to the outer surface of the connecting pipe which is externally inserted into the core portion. A diameter reducing member for reducing the diameter of the pipe, the diameter reducing member is sheared by the shearing portion by compressing in an axial direction with a sleeve portion provided so as to be able to reduce the diameter and a shearing portion provided in a thin wall, so that an inner surface is formed. An annular portion which fits on the outer surface of the sleeve portion to reduce the diameter of the sleeve portion. In the above, the reduced diameter member is locked to the joint main body.

[0005] In the above, the sleeve portion of the reduced diameter member is provided with an engagement portion with the joint body, the reduced diameter member is engaged with the joint body, and the annular portion is moved to the joint body side to reduce the sleeve portion. It is a sleeve type pipe joint characterized by having a diameter.
In the above, the engagement portion with the joint main body is provided on the annular portion of the reduced diameter member, the reduced diameter member is locked on the joint main body, and the sleeve portion is reduced in diameter by moving the sleeve portion to the joint main body side. This is a sleeve type pipe joint characterized by the following. In the above, the sleeve portion of the reduced-diameter member has a cut on a part of the circumference. Further, in the above, the reduced diameter member is made of a synthetic resin, and is a sleeve-type pipe joint.

[0006]

The present invention has the above-mentioned structure, and has only two members, a joint body and a reduced diameter member, and compresses the reduced diameter member in the axial direction after installing the pipe, thereby shearing the reduced diameter member. The part is sheared and the annular part fits on the outer surface of the sleeve part, the sleeve part is compressed and reduced in diameter on the inner surface of the annular part, the outer surface of the connecting pipe is compressed on the inner surface of the sleeve part, and the connecting pipe is connected to the core of the joint body. And are connected between them. Therefore, connection can be made using a relatively simple tool, and handling is easy because the sleeve portion and the annular portion are integrated. At this time, if the reduced diameter member is locked and integrated with the joint main body, further assembling errors do not occur and handling is easy.

By holding the reduced diameter member on the joint main body, when a pulling force is applied to the connecting pipe, the core and the reduced diameter member holding the pipe are locked together with the joint main body. Therefore, the pull-out inhibiting force is high, and the pipe joint is a single member, so that the workability is good. The engagement between the joint body and the reduced-diameter member is achieved by providing a locking portion on the sleeve portion of the reduced-diameter member and engaging with the joint body. In this case, the annular portion is sleeved only by the frictional force that fits on the outer surface of the sleeve portion. The diameter of the portion is reduced to reduce the outer diameter of the tube. In addition, an engagement portion with the joint body can be provided on the annular portion of the reduced-diameter member to be engaged with the joint body. In this case, the sleeve portion is press-fitted between the annular portion and the outer peripheral surface of the tube, and Is compressed to reduce the diameter.

The diameter of the sleeve portion can be easily reduced if a part of the circumference is cut so as to be reduced in diameter. In addition, when the connecting pipe is inserted into the joint body, the connecting pipe can be confirmed from the outside via the cutout portion of the sleeve part, so that insufficient insertion of the pipe can be solved. The reduced diameter member can be formed of a synthetic resin. In this case, the sheared portion can be formed into a shape that is easily sheared, and the tube can be compressed by easily compressing in the axial direction from the sheared portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 to 3 show a first embodiment of the present invention. FIG. 1 shows a state before connection with a connection pipe 30 mounted, FIG. 2 shows a perspective view of a reduced diameter member, and FIG. It is a fragmentary sectional view showing the state after. The pipe joint 10 includes a joint body 11 made of metal or resin and a reduced diameter member 20 made of metal or resin. The joint body 11 has a cylindrical core 12 inserted into the inner surface of the connection pipe 30, and the outer surface of the core 12 is provided with a saw-tooth-shaped uneven portion 13 in cross section. A tube end abutting portion 14 against which the end of the connecting tube abuts is provided in the back of the core 12, and a locking groove 15 for engaging with the reduced diameter member 20 is provided in the back thereof.

The diameter reducing member 20 has a substantially cylindrical shape as a whole, and a sleeve portion 21 provided with a cutout portion 27 capable of reducing the diameter, a cylindrical annular portion 24, and the sleeve portion 21 and the annular portion 24 are connected to each other for easy shearing. And a shear portion 25 formed as thin as possible. The end of the sleeve portion 21 is the locking groove 1 of the joint body.
5 is provided with a locking projection 23 for locking the sleeve 21 from the end of the joint body so that the locking projection 23 is locked in the locking groove 14 of the main body. Further, a flange portion 22 is provided so as to protrude from the outer surface, and a pressure-receiving outer surface 26 having a thick large-diameter portion and a tapered surface is provided on the end side. The end of the tapered surface is formed integrally with the annular portion 24 via a thin shear portion 25. The inner diameter of the annular portion 24 is provided to be larger than the outer diameter of the small diameter side of the tapered surface, and is further provided in a thick cylindrical shape which is more rigid than the sleeve portion 21.

By compressing the space between the annular portion 24 and the flange portion 22 formed on the outer surface of the sleeve portion in the axial direction, the shear portion 25 is sheared, and the annular portion 24 rides on the pressure receiving outer surface 26 of the sleeve portion 21, and gradually. The diameter of the sleeve portion 21 is reduced on the inner surface of the annular portion 24 by the tapered surface having a large diameter. The diameter of the sleeve portion 21 is easily reduced because the cut portion 27 is provided at a plurality of positions on the circumference. FIG. 3 shows a state in which the sleeve 30 and the annular portion are axially compressed to reduce the diameter of the tube 30 and the connection is completed. When the diameter of the sleeve portion 21 is reduced, the connecting tube 30 is strongly pressed against the outer peripheral surface of the core 12, and the inner surface of the tube 30 bites into the uneven portion 13 on the outer surface of the core, thereby preventing sealing and pulling out.

In this embodiment, a reduced diameter member 20 is attached to the joint body 11.
Since the pipes are locked and assembled, the work of connecting the pipes is only required to compress the reduced diameter member 20 in the axial direction after insertion into the joint, and no assembly error of the parts occurs. In addition, the compression operation of the reduced diameter member in the axial direction can be easily performed by using a simple manual compression tool 50 as shown in FIG. Further, since the cut portion 27 is provided in the sleeve portion 21 of the diameter reducing member 20, the connection pipe 30 is externally passed through the cut portion 27.
Can be confirmed, and whether the connection pipe 30 is correctly in contact with the pipe end contact portion 14 of the joint body can be confirmed, and insufficient insertion of the connection pipe 30 into the joint body 11 can be prevented. Further, the completion of the connection operation can be easily confirmed by confirming whether or not the annular portion 24 is in contact with the flange portion 22.

FIG. 5 is a partial sectional view showing a second embodiment of the present invention before connection. In this embodiment, there is no locking projection 23 for locking to the joint body of the first embodiment, and the reduced diameter member 200 and the joint body 11 are provided as separate members without being locked. Therefore, the diameter reducing member 200 is almost the same except for the locking projection 23 of the first embodiment. Further, a flange 15 is provided on the outer peripheral surface of the joint body 11 so as to protrude, and the space between the flange 15 and the annular portion 24 of the reduced diameter member is compressed in the axial direction, so that the sleeve portion 201 of the reduced diameter member is similar to the first embodiment. Is reduced in diameter to compress the outer surface of the connection pipe 30, and is sandwiched between the core 12 and a seal to prevent pull-out.

FIG. 6 is a partial sectional view showing a third embodiment of the present invention before connection. In this embodiment, the positional relationship between the sleeve portion and the annular portion of the reduced diameter member in the first embodiment is reversed. That is, similarly to the first embodiment, the joint body 10 has a cylindrical core 12 inserted into the inner surface of the connection pipe 30, and the outer surface of the core 12 is provided with a concave-convex portion 13 having a sawtooth cross section. A tube end abutting portion 14 against which the end of the connecting tube abuts is provided in the back of the core 12, and a locking groove 15 for engaging with the reduced diameter member 20 is provided in the back thereof.

The diameter reducing member 60 includes a sleeve portion 61 having a cut portion 67, a cylindrical annular portion 64, and a shear portion 65 formed between the sleeve portion 61 and the annular portion 64 so as to be capable of shearing. . The difference from the first embodiment is that the diameter reducing member 6
0 and the joint body 11 are locked, and in this embodiment, the reduced diameter member 60 is used.
A plurality of locking projections 63 are provided on the annular portion 64 so as to protrude,
This is the point that this is locked in the locking groove 15 of the joint body. A flange 62 is provided at the end of the sleeve 61 so as to protrude. The inner diameter of the annular portion 64 is provided to be larger than the outer diameter of the tapered surface 66 on the small diameter side, and is further provided in a thick cylindrical shape which is more rigid than the sleeve portion 61.

The space between the annular portion 64 and the flange 62 formed on the outer surface of the sleeve portion is compressed in the axial direction in the same manner as in the first embodiment, so that the sleeve portion 61 is sheared from the shear portion 65.
Is pressed into the inner surface of the annular portion 64, and the diameter of the sleeve portion 61 is reduced on the inner surface of the annular portion 64 by the tapered surface 66 of the sleeve portion 61 having a gradually increasing diameter. Since the sleeve portion 61 is provided with the cut portions 67 at a plurality of positions on the circumference, the diameter can be easily reduced. The outer surface of the connection tube 30 is reduced by the inner surface of the sleeve portion, and the inner surface of the connection tube is formed by the core 12. The outer surface is compressed to provide sealing and pull-out prevention.

[0017]

As described in detail above, the sleeve type pipe joint according to the present invention is formed with a minimum number of parts, can be easily and securely connected, shortens the work time at the time of connection, and causes a work error. Absent.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of the present invention with a connection pipe attached.

FIG. 2 is a perspective view showing a reduced diameter member 20 of the first embodiment.

FIG. 3 is a partial cross-sectional view showing a connected state of the first embodiment.

FIG. 4 is a front view showing a state at the time of connection using a manual compression tool 50;

FIG. 5 is a partial sectional view showing a second embodiment of the present invention.

FIG. 6 is a partial sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Pipe joint 11 Joint main body 12 Core 13 Saw-toothed uneven part 14 Locking concave groove 15 Pipe end butting part 20, 60 Reduced diameter member 21, 61
Sleeve part 22 Tsuba 23, 63
Locking projection 24 annular part, 64 25, 65
Shearing part 26, 66 Tapered surface 27, 67
Cutting part 30 Connecting pipe 50 Manual compression tool

Claims (6)

[Claims] 1. A joint body having a core portion inserted into and supported on an inner surface of a connecting pipe, and a reduced-diameter member mounted on an outer surface of the connecting pipe externally inserted into the core portion to reduce the diameter of the connecting pipe. The diameter-reducing member includes a sleeve portion provided so as to be reduced in diameter and a thin-walled shearing portion, and is compressed in the axial direction so as to be sheared by the shearing portion so that the inner surface fits into the outer surface of the sleeve portion. A sleeve-type pipe joint comprising an annular portion whose diameter is reduced. 2. The sleeve type pipe joint according to claim 1, wherein said reduced diameter member is locked to said joint body. 3. The sleeve portion of the reduced diameter member is provided with an engagement portion with the joint body, the reduced diameter member is engaged with the joint body, and the annular portion is moved to the joint body side to reduce the diameter of the sleeve portion. The sleeve-type pipe joint according to claim 1, wherein 4. An annular portion of the reduced diameter member is provided with an engagement portion with the joint body, the reduced diameter member is engaged with the joint body, and the sleeve portion is moved to the joint body side to reduce the diameter of the sleeve portion. The sleeve-type pipe joint according to claim 1, wherein 5. The sleeve-type pipe joint according to claim 1, wherein the sleeve portion of the reduced diameter member has a cut in a part on a circumference. 6. The sleeve type pipe joint according to claim 1, wherein said reduced diameter member is made of a synthetic resin.