JPH0742883A - Device for connecting synthetic resin pipe and method and jig for machining end of synthetic resin pipe - Google Patents

Abstract

PURPOSE:To enable firm connection without removing a synthetic resin pipe by tightening a cover nut having an internal thread formed thereon that engages with the external thread of a connector, thus sandwiching the flange portion of the synthetic resin pipe between the cover nut and the end face of the connector. CONSTITUTION:To connect a synthetic resin pipe 1 to a connector 2, a cover nut 3 is fitted around a sleeve 4 before a flange portion 1a is formed in the synthetic resin pipe 1. The flange portion 4b of the sleeve 4 is made to abut to the flange portion 1a of the synthetic resin pipe 1, and the synthetic resin pipe 1 is inserted along the socket guide portion 2c of the connector 2, and the end portion of the synthetic resin pipe 1 is enclosed in a storage recessed portion 2b via a sealing member 5. Under these conditions, the cover nut 3 is engaged with the connector 2 and tightened in order to press the sleeve 4 against the connector 2 and reduce the diameter of a diameter-reduced portion 4a using the inner hole 3b of the cover nut 3. Thereby the flange portion 1a of the synthetic resin pipe 1 is firmly held in place via the sealing member 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe connecting device for connecting a synthetic resin pipe used for hot water supply, water supply, gas supply or the like or equipment for using the same to a connected object such as a joint or a branch pipe. More particularly, the present invention relates to a synthetic resin pipe connecting device capable of firmly connecting a synthetic resin pipe to a body to be connected while the synthetic resin pipe is retained. Further, the present invention relates to a method of processing an end portion of a synthetic resin pipe for forming a collar portion at the end portion of the synthetic resin pipe when connecting the synthetic resin pipe, and a processing jig used for the method.

[0002]

2. Description of the Related Art Conventionally, as a method of connecting a synthetic resin pipe of this kind to a body to be connected, for example, a method of adhering with an adhesive, a method of press fitting, etc. have been adopted. Not only is the method laborious to connect, but also the connection strength and sealability are not sufficiently reliable.
The connecting device as shown in FIG. 4 is generally adopted.

FIG. 14 is a sectional view showing a conventional connecting device for synthetic resin pipes.

That is, FIG. 14 is shown in Japanese Patent Laid-Open No. 63-280992.
1 shows a connecting device for synthetic resin pipes disclosed in Japanese Patent Publication No.

First, in order to connect the synthetic resin pipe 1 to the connected body 2, the synthetic resin pipe 1 is inserted into the receptacle guide portion of the connected body 2, and then the connected body 2 is covered with a cap nut in the form of a cap nut. Screw 3 and tighten. At this time, since the sleeve 4 has a taper and is formed so as to have a reduced diameter, the sleeve 4 is pressed by the inner periphery of the cover nut 3 to reduce the diameter, and the synthetic resin pipe 1 is connected to the connected body 2. Press against the socket guide part of. In this way, the synthetic resin pipe 1 is connected to the connected body 2
Connected to.

[0006]

According to such a conventional connecting device for synthetic resin pipes, the synthetic resin pipes can be connected by a simple operation. However, in the conventional connection device for synthetic resin pipes, if the tightening force of the cover nut is not set appropriately, the connected body etc. may be deformed and destroyed by the excessive tightening force, or the tightening force may be reduced. There was a possibility that the synthetic resin pipe would fall out due to lack of it. Even if the cover nut has a proper tightening force, especially when expansion and contraction due to temperature differences are repeated, the coupling force of the connection part gradually decreases due to aging, and finally the synthetic resin pipe is pulled out. There was also a possibility.

[0007] Therefore, a first object of the present invention is to provide a connecting device for a synthetic resin pipe in which the synthetic resin pipe is firmly connected without being pulled out. Further, in general, the connection of the synthetic resin pipe to the connected body is performed on site by adjusting the synthetic resin pipe to an appropriate length. Therefore, the present invention provides a method for processing an end portion of a synthetic resin pipe in which a flange is formed at the end portion of the synthetic resin pipe when configuring the above-described connecting device for the synthetic resin pipe, and a processing jig used therefor. Is the second subject.

[0008]

According to a first aspect of the present invention, there is provided a synthetic resin pipe connecting device including a synthetic resin pipe having a flange portion at an end, a connected body having a male screw at the end, and a male screw thereof. And a cover nut having a female screw to be screwed onto the connecting nut, and by screwing the cover nut onto the connected body and tightening the cover nut, the flange portion of the synthetic resin pipe is inserted between the end surface of the connected body and the cover nut. It is sandwiched by and the synthetic resin pipe is connected to the connected body.

According to a second aspect of the present invention, there is provided a synthetic resin pipe connecting device in which a synthetic resin pipe having a flange portion at an end thereof, a connected body having a male screw at the end, and a female screw screwed to the male screw. A cover nut having, and a sleeve having a tapered reduced diameter portion that is mounted in the cover nut, and by screwing and tightening the cover nut to the connected body,
Reduce the diameter of the sleeve to press it against the synthetic resin pipe, and hold the collar of the synthetic resin pipe between the sleeve and the end face of the connected body to connect the synthetic resin pipe to the connected body. It is the one.

The connected body of the connecting device for a synthetic resin pipe according to a third aspect of the present invention has a tubular receiving guide portion which is inserted inside the synthetic resin pipe and supports the synthetic resin pipe.

According to a fourth aspect of the present invention, there is provided a connecting device for a synthetic resin pipe, wherein the collar portion of the synthetic resin pipe is provided between the end face of the body to be connected,
A seal member made of an elastic material is arranged.

According to a fifth aspect of the present invention, there is provided a method for processing an end portion of a synthetic resin pipe, wherein the end portion of the synthetic resin pipe is partially heated to be softened,
The synthetic resin pipe is fitted into the inner diameter holding portion and pressed against a flat surface perpendicular to the cylindrical surface in a supported state, thereby expanding the diameter of the softened portion of the synthetic resin pipe and forming the collar portion. .

According to a sixth aspect of the present invention, there is provided an inner diameter holding portion for holding an inner diameter of a synthetic resin pipe obtained by partially heating and softening the end of the synthetic resin pipe. A means for expanding the softened portion of the synthetic resin pipe by pressing it against a surface in the vertical direction with respect to the inner diameter holding portion,
And a means for molding the softened portion of the diameter-expanded synthetic resin pipe into the collar portion.

According to a seventh aspect of the present invention, there is provided a jig for processing an end portion of a synthetic resin pipe, wherein a means for partially heating the end portion of the synthetic resin pipe to soften it and an inner diameter of the softened synthetic resin pipe. Means for expanding the softened portion of the synthetic resin pipe by pressing against a surface in a direction perpendicular to the inner diameter holding part while being fitted to the inner diameter holding part to hold, and softening the expanded synthetic resin pipe And a means for molding the portion into a collar portion.

[0015]

According to the first aspect of the present invention, the flange portion of the synthetic resin pipe is sandwiched between the end surface of the connected body and the cover nut by screwing and tightening the cover nut onto the connected body, and the synthetic resin pipe is covered. Since the flange portion of the synthetic resin pipe is connected to the connecting body and prevents the synthetic resin pipe from coming off, the synthetic resin pipe is firmly connected without being pulled out.

According to a second aspect of the present invention, the cover nut is screwed onto the connected body and tightened so that the reduced diameter portion of the sleeve is reduced in diameter and pressed against the synthetic resin pipe. The collar portion of the synthetic resin pipe is sandwiched between them, and the synthetic resin pipe is connected to the connected body. Therefore, the flange portion of the synthetic resin pipe serves as a stopper and the synthetic resin pipe is firmly connected without being pulled out.

According to the third aspect of the present invention, since the solid resin pipe has a solid tubular guide portion which is inserted inside the synthetic resin pipe and supports the synthetic resin pipe, the end faces of the synthetic resin pipe and the connected body are provided. The reliability of connection with can be improved.

According to a fourth aspect of the present invention, a seal member made of an elastic material is arranged between the collar portion of the synthetic resin pipe and the end surface of the connected body.

In the present invention, the end of the softened synthetic resin pipe is pressed against the surface, the softened portion is expanded outward in the radial direction, and the softened portion of the expanded synthetic resin pipe is formed into the collar portion. Therefore, the synthetic resin pipe is always pressed perpendicularly to the surface, whereby the diameter expansion is made uniform.

According to the present invention, the end of the softened synthetic resin pipe is pressed against the surface, and the softened portion is expanded outward in the radial direction, thereby forming the enlarged flange portion. Since the collar portion can be formed while supporting the synthetic resin pipe, the synthetic resin pipe is always pressed perpendicularly to the surface, whereby the diameter expansion can be uniformly formed.

According to the present invention, the end portion of the softened synthetic resin pipe is pressed against the surface by heating, and the softened portion is expanded outward in the radial direction, thereby forming the enlarged flange portion. Since the flange portion can be formed with the synthetic resin pipe being supported, the synthetic resin pipe is always pressed vertically against a flat surface, whereby the diameter expansion can be uniformly formed.

[0022]

Embodiment 1 An embodiment of the synthetic resin pipe connecting device of the present invention will be described below.

<First Embodiment> FIG. 1 is a sectional view showing a first embodiment of a synthetic resin pipe connecting device according to the present invention.

In FIG. 1, reference numeral 1 is a commercially available flexible synthetic resin pipe, 1a is a collar portion formed at the end of the synthetic resin pipe 1, and 2 is a body to be connected, such as hot water, hot water or gas. It corresponds to a joint used for piping such as, a branch pipe, or a connection port of a device using hot water, water supply, gas, or the like. Reference numeral 2a is a male screw formed at the end of the connected body 2, 2b is a housing recess formed at the end of the connected body 2, 2c is a receptacle guide formed at the end of the connected body 2, 3 is a cover nut in the shape of a substantially cap nut having an opening at the center of the tip having an inner hole 3b having a smaller diameter than the threaded portion, 3a is a female screw formed inside the cover nut 3, 4 is a sleeve, and 4a is a sleeve. 4 reduced diameter section,
4b is a collar portion, and 5 is a seal member made of an elastic body.

Next, a detailed description will be given of the synthetic resin pipe connecting device of this embodiment, which is equipped with the synthetic resin pipe 1, the connected body 2, the cover nut 3, the sleeve 4 and the seal member 5.

The synthetic resin pipe 1 of this embodiment is made of a synthetic resin such as cross-linked polyethylene or polybutene, and has a flange 1a at its end. In particular, the collar portion 1a of the present embodiment is double formed with a crushed U-shaped cross section. The connected body 2 is generally formed of a metal or a relatively hard synthetic resin. A male screw 2a is formed on the outer surface of the end on the side to which the synthetic resin pipe 1 is connected, and a recess 2b for accommodating the end of the synthetic resin pipe 1 is formed. Further, the connected body 2 is integrally provided with a socket guide portion 2c which is fitted in the synthetic resin pipe 1 and guides and positions it.

The cover nut 3 is the male screw 2 of the connected body 2.
It has a female screw 3a screwed into a and has an inner hole 3b having a diameter slightly larger than the diameters of the synthetic resin pipe 1 and the end of a sleeve 4 described later. The cover nut 3 is made of a material such as metal or hard synthetic resin. The sleeve 4 is a tubular member having an inner diameter substantially equal to the outer diameter of the synthetic resin pipe 1, and when arranged, the reduced diameter portion 4 a is provided on the side opposite to the connected body 2 and the connected body 2 of the connected body 2. Each side end has a collar portion 4b. The diameter-reduced portion 4a has a tapered outer surface whose diameter becomes smaller as the distance from the connected body 2 increases, and when the cover nut 3 is tightened, the diameter is reduced by being pressed by the inner hole 3b. In order to enable this diameter reduction, the sleeve 4
May be made of a soft metal or a synthetic resin, and the reduced diameter portion 4a may be provided with an appropriate number of slits in the lengthwise direction, if necessary. Usually, the reduced diameter portion 4a is caulked by the inner hole 3b of the cover nut 3 to reduce the diameter. The seal member 5 is formed in a ring shape having a size that can be accommodated in the accommodation recess 2b of the connected body 2 and is made of an elastic material such as rubber.

Next, the assembling of the synthetic resin pipe connecting device of this embodiment will be described.

In order to connect the synthetic resin pipe 1 to the connected body 2, the cover nut 3 and the sleeve 4 are fitted in advance before the collar portion 1a is formed on the synthetic resin pipe 1, or the synthetic resin pipe 1 is fitted. With fitting from the other end of the pipe 1, the collar portion 4b of the sleeve 4 is in contact with the collar portion 1a of the synthetic resin pipe 1,
The synthetic resin tube 1 is inserted along the receptacle guide portion 2c of the connected body 2, and the end portion thereof is housed in the housing recess 2b in which the seal member 5 is arranged in advance. Then, the cover nut 3 is screwed into the connected body 2 and tightened. By tightening the cover nut 3, the sleeve 4 is pressed in the direction of the connected body 2, and the reduced diameter portion 4a thereof is reduced in diameter by the inner hole 3b of the cover nut 3. As a result, the collar portion 1a at the tip of the synthetic resin pipe 1 is the accommodation recess 2b that is the end surface of the connected body 2.
Is firmly sandwiched between the bottom surface of the sleeve 4 and the collar portion 4b of the sleeve 4 via the seal member 5, and the synthetic resin pipe 1 is fixed to the receptacle guide portion 2c by the reduced diameter portion 4a of the sleeve 4. It

As described above, the connecting device for the synthetic resin pipe of the present embodiment includes the synthetic resin pipe 1 having the flange portion 1a at the end, the connected body 2 having the male screw 2a, and the connected body. Female screw 3a to be screwed into male screw 2a of
The collar part 1 of the synthetic resin pipe 1 by tightening the
and a cover nut 3 for connecting the synthetic resin pipe 1 inserted to the end face of the connected body 2 and connecting the inserted synthetic resin pipe 1 to the connected body 2, which is the embodiment of claim 1. Corresponds to the example.

Therefore, since the collar portion 1a of the synthetic resin pipe 1 is sandwiched between the end surface of the connected body 2 and the cover nut 3, the synthetic resin pipe 1 is securely prevented from coming off and a strong connection is made. You can get the status. The collar portion 1a may have a single collar shape, but in the present embodiment, it has a double-layered structure with a crushed U-shaped cross section. Therefore, the collar portion 1a not only has higher strength, but also can retain elasticity due to the bent shape of the crushed U-shaped cross section, and absorbs expansion and contraction of the synthetic resin pipe 1. be able to. Further, the connection by elastically sandwiching the U-shaped collar portion 1a also acts as a locking stopper for the cover nut 3.

Further, in the connecting device for synthetic resin pipes of the present embodiment, the synthetic resin pipe 1 having the flange portion 1a at its end and the male screw 2 are used.
Connected body 2 in which a is formed, and male screw 2 of the connected body 2
By forming a female screw 3a to be screwed into a and tightening the female screw 3a, the reduced diameter portion 4a of the sleeve 4 is reduced in diameter and pressed against the synthetic resin pipe 1, and the synthetic resin pipe 1 is inserted. And a cover nut 3 for connecting the synthetic resin pipe 1 to the connected body 2 by sandwiching the collar portion 1a between the connected body 2 and the end surface of the connected body 2, which is defined in claim 2. It corresponds to the embodiment.

In this embodiment, a flange portion 1a is formed at the end of the synthetic resin pipe 1, and the flange portion 1a is sandwiched and fixed between the end surface of the connected body 2 and the flange portion 4b of the sleeve 4. Therefore, the reduced diameter portion 4a of the sleeve 4 reduces the diameter of the synthetic resin tube 1 to prevent the tensile force from being applied only to the collar portion 1a of the synthetic resin tube 1, and the reduced diameter portion 4a of the sleeve 4 prevents the tensile force from being applied. Since it can be distributed, a stable mounting state can be maintained.

The connected body 2 has a cylindrical socket guide portion 2c which is inserted inside the synthetic resin pipe 1 and supports the synthetic resin pipe 1. This is the embodiment of claim 3. Equivalent to. In particular, in this embodiment, since the synthetic resin pipe 1 is contracted and pressed by the reduced diameter portion 4a of the sleeve 4 and the receiving port guide portion 2c, the tensile force is applied only to the collar portion 1a of the synthetic resin pipe 1. Of the sleeve 4 and the reduced diameter portion 4a of the sleeve 4
Since it can be dispersed in, a more stable mounting state can be maintained. Further, in this embodiment, since the connected body 2 has the socket guide portion 2c, the connection end portion of the synthetic resin pipe 1 can be easily positioned. Also, the sleeve 4
Since the synthetic resin pipe 1 is sandwiched and fixed between the reduced diameter portion 4a and the reduced diameter portion 4a, even if an external force such as bending is applied to the piped synthetic resin pipe 1, the stress such as bending is not affected by the collar portion. Since it does not reach the holding portion of 1a, the connecting force of the synthetic resin pipe 1 does not decrease.

Further, in this embodiment, the collar portion 1a of the synthetic resin pipe 1 is used.
The seal member 5 made of an elastic material is disposed between the end face of the connected body 2 and this, and this corresponds to the embodiment of claim 4.

In this embodiment, since the sealing member 5 made of an elastic material is used, the sealing effect corresponding to the expansion and contraction of the synthetic resin pipe 1 can be made more reliable.

In this embodiment, the connected body 2 has a housing recess 2b on the end face thereof, and the socket guide portion 2c positions the synthetic resin pipe 1 and the connected body 2 and also the cover nut. Since movement can be restricted on the inner circumference of 3,
The housing recess 2b can be omitted as appropriate.

<Second Embodiment> The second embodiment of the synthetic resin pipe connecting device according to the present invention is the same as the connected body 2 in the first embodiment.
The socket guide portion 2c integrally provided in the above is configured as a separate and independent member.

FIG. 2 is a sectional view showing a second embodiment of the synthetic resin pipe connecting device of the present invention. In the drawings, the same reference numerals and symbols as those in the first embodiment show the same or corresponding components as those of the first embodiment, and therefore, duplicated description will be omitted here.

In FIG. 2, the socket guide member 6 has a cylindrical portion 6a having an outer diameter that fits in the synthetic resin pipe 1 and a flange portion 6b at one end thereof. In order to connect the synthetic resin pipe 1 to the connected body 2 by using the socket guide member 6, the cover nut 3 and the sleeve 4 are pre-fitted in the synthetic resin pipe 1 as in the case of the first embodiment. At the same time, the socket guide member 6 is inserted into the end portion of the synthetic resin pipe 1 with the flange portion 6b facing outward. In this way, the synthetic resin pipe 1 fitted with these is brought into contact with the accommodation recess 2b of the connected body 2, and the cover nut 3 is screwed into the connected body 2 and tightened. As a result, FIG.
As shown in FIG. 2, the flange portion 1a of the synthetic resin pipe 1 is pressed toward the end surface of the connected body 2 by the flange portion 4b of the sleeve 4, and the flange portion 4b and the end surface of the connected body 2 (accommodating recess 2
It is clamped between the bottom surface b) and the flange portion 6b of the socket guide member 6. Further, the reduced diameter portion 4a of the sleeve 4 is reduced in diameter by the inner hole 3b of the cover nut 3, and the synthetic resin pipe 1 is pressed and fixed to the receiving port guide member 6.

The connecting device of the synthetic resin pipe of this embodiment is constructed in this way, and the collar portion 1a of the synthetic resin pipe 1 is between the collar portion 4b of the sleeve 4 and the collar portion 6b of the receiving port guide member 6. Since it is sandwiched between the end faces of the connected body 2 and is fixed in the axial direction, the synthetic resin pipe 1 can be reliably prevented from coming off, as in the first embodiment. . Further, the tubular portion 6a of the receiving port guide member 6 supports and reinforces the end portion of the synthetic resin pipe 1 as in the first embodiment, and the flange portion 6b of the connected body 2 is provided. By fitting in the accommodation recess 2b, it can also function as a positioning means for connecting the synthetic resin pipe 1. In addition, the effect of this embodiment is similar to that of the first embodiment, but in this embodiment, the seal member 5 used in the first embodiment is omitted. Although the sealing effect is also sufficient by this, the sealing effect can be further enhanced by using the receiving port guide member 6 of soft synthetic resin.

The present embodiment corresponds to the first, second and third embodiments.

<Third Embodiment> The inlet guide portion 2c in the first embodiment and the inlet guide member 6 in the second embodiment may be omitted.

FIG. 3 is a sectional view showing a third embodiment of the synthetic resin pipe connecting device of the present invention. In the drawings, the same reference numerals and symbols as those in the above-mentioned respective embodiments show the same or corresponding components as those in the above-mentioned respective embodiments, and therefore, redundant description will be omitted here.

In FIG. 3, the collar portion 1a of the synthetic resin pipe 1 is shown.
Is clamped and fixed between the flange portion 4b of the sleeve 4 and the end surface of the connected body 2 (bottom surface of the housing recess 2b), so that the synthetic resin pipe 1 is reliably prevented from being pulled out. Further, the reduced diameter portion 4a of the sleeve 4 is reduced in diameter by the inner hole 3b of the cover nut 3 and pressed against the outer periphery of the synthetic resin pipe 1 to be tightened, as in the above-described embodiment. The end portion is fixed and reinforced by the sleeve 4 in the inner hole 3b of the cover nut 3. In addition, the collar portion 4 of the sleeve 4
b functions as a positioning when connecting the synthetic resin pipe 1.

In this embodiment, the seal member 5 of the first embodiment is also omitted. However, if necessary, the sealing member 5 can be appropriately arranged, and thereby the sealing effect can be further enhanced.

In this embodiment, as described above, the collar portion 1a is provided at the end portion.
, A non-connecting body 2 having a male screw 2a at its end, a cover nut 3 having a female screw 3a screwed to the male screw 2a, and a cover nut 3 loosely fitted in the cover nut 3. A sleeve 4 having a reduced diameter portion 4a at one end and a collar portion 4b at the other end, and by tightening the cover nut 3, the collar portion 4 of the sleeve 4 is provided.
2b and the end face of the connected body 2 between the collar portion 1a of the synthetic resin pipe 1
And the reduced diameter portion 4a of the sleeve 4 is reduced in diameter and pressed against the outer surface of the synthetic resin pipe 1, which corresponds to the embodiments of claims 1 and 2.

<Fourth Embodiment> An embodiment in which the connecting device for synthetic resin pipes according to the present invention is the simplest will be described.

FIG. 4 is a sectional view showing a fourth embodiment of the synthetic resin pipe connecting device of the present invention. In the drawings, the same reference numerals and symbols as those in the above-mentioned respective embodiments show the same or corresponding components as those in the above-mentioned respective embodiments, and therefore, redundant description will be omitted here.

In FIG. 4, this embodiment shows a synthetic resin pipe 1.
And the non-connecting body 2 and the cover nut 3 only. Further, the flange portion 1a of the synthetic resin pipe 1 is also formed as a simple single flange. However, the cover nut 3 has an inner hole 3
Unlike the previous embodiments, b has an annular convex portion 3c protruding inward in the axial direction.

Then, the flange portion 1a of the synthetic resin pipe 1 is sandwiched between the annular convex portion 3c and the end surface of the connected body 2 (bottom surface of the accommodating concave portion 2b) by tightening the cover nut 3. As a result, the synthetic resin tube 1 is connected to the connected body 2 in a state in which the synthetic resin tube 1 is securely prevented from being pulled out, as in the previous embodiments. In this case, the positioning of the synthetic resin pipe 1 is performed exclusively by the collar portion 1a of the synthetic resin pipe 1.

This embodiment has a simple structure and can be applied to a relatively simple pipe. If the cover nut 3 is tightened sufficiently, a sufficient sealing effect can be obtained. . Of course, by using the seal member 5 described above, a more reliable sealing effect can be obtained, and by using the socket guide member 6 or by providing the connected body 2 with the socket guide portion 2c, the combination is achieved. The positioning of the resin pipe 1 and the fixing and reinforcement of the end portion can be made more reliable.

As described above, in this embodiment, the collar portion 1a is provided at the end portion.
And a cover nut 3 having a female screw 3a which is screwed to the male screw 2a, and a tightened cover nut 3 The flange portion 1a of the synthetic resin pipe 1 is clamped between the end surface of the connected body 2 and the cover nut 3 to connect the synthetic resin pipe 1 to the connected body 2 according to the embodiment of the present invention. Equivalent to.

In the synthetic resin pipe connecting device of the present embodiment, the components such as the connected body 2 and the cover nut 3 are described as having a specific shape, but the present invention is not limited to this. However, various modifications are possible. For example, the accommodating recess 2b of the connected body 2 can be omitted, and instead of the accommodating recess 2b, it is possible to provide a positioning protrusion having a shortened receptacle guide 2c. Further, although the seal member 5 is formed in the shape of a disc, it may be formed in the shape of an O-ring.
In this case, it is desirable to form an annular groove for holding this in the end surface of the connected body 2.

<Fifth Embodiment> The first to fourth embodiments have been described as the embodiments of the connecting device for the synthetic resin pipe. However, when constructing such a connecting device for the synthetic resin pipe, the synthetic resin The collar portion 1a at the end of the pipe 1 can be formed in advance at the time of molding the synthetic resin pipe 1, but the synthetic resin pipe 1 is generally formed as a long material and cut into an appropriate length at a pipe construction site. used. For this reason, it is necessary to form the collar portion 1a at the end of the synthetic resin pipe 1 on the spot. Next, a method of processing an end portion of a synthetic resin pipe for forming such a collar portion 1a and a processing jig used therefor will be described.

First, a single collar portion 1 is attached to the end of the synthetic resin pipe 1.
The case of forming a will be described with reference to FIGS.

FIG. 5 is a perspective view showing a first embodiment of a method of processing an end portion of a synthetic resin pipe and a processing jig of the present invention, and FIG. 6 shows the processing jig shown in FIG. It is sectional drawing which shows the shaping | molding of the collar part of the edge part of a synthetic resin pipe. It should be noted that, in the drawings, the same reference numerals and symbols as those in the above-mentioned embodiment indicate the same or corresponding components as those in the above-mentioned embodiment, and therefore, duplicated explanations are omitted here.

In the figure, 1 is a synthetic resin pipe, 10 is a working jig, 11 is a base portion of the working jig 10, and 12 is an inner diameter holding portion of the working jig 10. The processing jig 10 is made of metal, ceramics, or other heat resistant material,
It has a base portion 11 having a flat surface, and an inner diameter holding portion 12 provided perpendicularly to the base portion 11. The inner diameter holding portion 12 has a columnar shape having a diameter close to the synthetic resin pipe 1, and fits into the synthetic resin pipe 1 to support it. These surfaces are formed as sufficiently smooth non-adhesive surfaces so that the softened synthetic resin pipe 1 is unlikely to adhere to them. In the working jig 10, in this embodiment, a rounded portion 13 having a predetermined curvature is formed so that the base end surface of the inner diameter holding portion 12 is gently curved and continuous with the surface of the base portion 11. Therefore, the diameter of the end portion of the synthetic resin pipe 1 can be easily expanded.

In order to form the collar portion 1a at the end portion of the synthetic resin pipe 1 using such a processing jig 10, the synthetic resin pipe 1
The area which becomes the collar portion 1a at the end portion of is heated by a lighter, a torch lamp, a dryer, a hot air blower or the like to be softened. At the same time, the synthetic resin pipe 1 is inserted into the inner diameter holding portion 12 of the processing jig 10 and is pressed against the surface of the base portion 11 while being supported by the cylindrical surface thereof in the direction of the arrow shown in the drawing. As a result, the end portion of the synthetic resin pipe 1 is expanded in diameter from the tip thereof and is expanded into a disc shape to form a collar portion 1a as shown by a broken line in the figure. At this time, the rounded portion 13 guides the tip of the synthetic resin pipe 1 outward in the radial direction, and facilitates the diameter expansion of the synthetic resin pipe 1 in a disk shape from the tip.

Here, the heating for softening the end portion of the synthetic resin pipe 1 is performed even before the synthetic resin pipe 1 is inserted into the inner diameter holding portion 12 of the processing jig 10.
It may be in a state of being fitted to 2. As a heating means, a lighter, a torch lamp, a hot air blower, a heating burner, or any other method can be used. Further, when the heating jig is inserted into the processing jig 10, a heating element may be incorporated inside the processing jig 10, or the heating means may be assembled at an appropriate position of the processing jig 10. it can.

As described above, the method for processing the end portion of the synthetic resin pipe of the present embodiment is such that the end portion of the synthetic resin pipe 1 is heated and softened, and the softened synthetic resin pipe 1 is held at its inner diameter. In the state of being fitted to the inner diameter holding portion 12, the pressing step is performed on the base portion 11 having a flat surface perpendicular to the inner diameter holding portion 12 to expand the diameter of the softened portion of the synthetic resin pipe 1, and at the same time,
And a step of molding the softened portion of the expanded synthetic resin pipe 1 into the collar portion 1a, which corresponds to the embodiment of claim 5.

Therefore, the end portion of the synthetic resin pipe 1 is softened by partial heating, and the synthetic resin pipe 1 is fitted into the cylindrical inner diameter holding portion 12 and is supported by the cylindrical surface. It is pressed against the base portion 11 having a vertical flat surface, whereby the diameter of the end portion of the synthetic resin pipe 1 is expanded and the flange portion 1a is formed. Therefore, since it is supported by the cylindrical surface, the synthetic resin pipe 1 is always pressed perpendicularly to the flat surface, and as a result, it is possible to uniformly and radially expand outward in the radial direction. Since the processing jig 10 lowers the temperature of the softened portion of the synthetic resin pipe 1, the collar portion 1a
Stable molding becomes easy, and workability is good due to its curing speed.

Further, the jig 10 for processing the end of the synthetic resin pipe of this embodiment is provided with an inner diameter holding portion 12 for holding the inner diameter of the synthetic resin pipe 1 by partially heating and softening the end. In the fitted state, a means for pressing the inner diameter holding portion 12 against a flat surface in the vertical direction to expand the softened portion of the synthetic resin pipe 1 and a softened portion of the expanded synthetic resin pipe 1 are provided. Collar 1a
It is provided with a means for molding into a sheet and corresponds to the embodiment of claim 6.

Therefore, since the inner diameter holding portion 12 having the cylindrical surface is provided, the synthetic resin pipe 1 can be easily softened. Further, the inner diameter holding portion 12 has a rounded portion 13 at the base end thereof, and the base end surface of the inner diameter holding portion 12 has a base portion 1.
Since the surface of 1 is gently curved, the synthetic resin tube 1 can easily expand its diameter from its tip.

<Sixth Embodiment> Next, at the end portion of the synthetic resin pipe 1, a double collar portion 1 bent into a crushed U-shaped cross section is formed.
A method for forming a and a processing jig will be described.

FIG. 7 is a perspective view showing a second embodiment of the method of processing the end portion of the synthetic resin pipe and the processing jig of the present invention, and FIG. 8 shows the processing jig shown in FIG. It is sectional drawing which shows the shaping | molding of the collar part of the edge part of a synthetic resin pipe. In the figure, the same reference numerals and symbols as those used in the above-mentioned embodiment indicate the same or corresponding components as those of the above-mentioned embodiment.

As shown in the drawing, the formation of the double collar portion is carried out by the same operation as that of the above-mentioned embodiment and using the same processing jig 10. In particular, the processing jig 10 of this embodiment is
An annular recess 14 having a curved surface is formed at the base end of the inner diameter holding portion 12 on the surface of the base portion 11.
It is possible to receive and engage the tip of the. Then, the synthetic resin pipe 1 is inserted into the processing jig 10, and the end portion of the synthetic resin pipe 1 is heated to be sufficiently softened. Then, the synthetic resin tube 1 is pressed against the surface of the base 11 while being supported by the cylindrical surface of the inner diameter holding portion 12. At this time, since the tip of the synthetic resin pipe 1 is housed and locked in the annular recess 14, the inner portion thereof bulges outward in the radial direction,
Expand the diameter. In this way, as shown by the dotted line in the figure,
The double collar 1a is formed.

As described above, the method for processing the end portion of the synthetic resin pipe of the present embodiment is such that the end portion of the synthetic resin pipe 1 is heated and softened, and the inner diameter of the softened synthetic resin pipe 1 is maintained. In the state of being fitted to the inner diameter holding portion 12 that is to be pressed, the step of pressing the inner diameter holding portion 12 having the annular recessed portion 14 to expand the diameter of the softened portion of the synthetic resin pipe 1 and the expanded synthetic resin at the same time. And a step of forming the softened portion of the pipe 1 into the collar portion 1a, which corresponds to the embodiment of claim 5.

Accordingly, the vicinity of the end of the synthetic resin pipe 1 is softened by heating, and in a state where the synthetic resin pipe 1 is fitted and supported by the cylindrical inner diameter holding portion 12, a flat surface perpendicular to the cylindrical surface is formed. Press on the base 11 of the surface, thereby
The diameter of the end portion of the synthetic resin pipe 1 is expanded to form the collar portion 1a. Therefore, since the synthetic resin pipe 1 is supported by the cylindrical surface, it can be pressed against the inner diameter holding portion 12 having the annular recess 14, and as a result, the diameter can be uniformly expanded outward in the radial direction. Since the processing jig 10 lowers the temperature of the softened portion of the synthetic resin pipe 1, the collar portion 1a
Stable molding becomes easy, and workability is good due to its curing speed.

Further, the jig 10 for processing the end portion of the synthetic resin pipe of this embodiment is provided with an inner diameter holding portion 12 for holding the inner diameter of the synthetic resin pipe 1 by partially heating and softening the end portion. A means for pressing the inner diameter holding portion 12 having the annular recessed portion 14 in the fitted state to expand the softened portion of the synthetic resin pipe 1 and a flange portion for the softened portion of the expanded synthetic resin pipe 1. 1a, and means for molding into 1a, which corresponds to the embodiment of claim 6.

Therefore, since the inner diameter holding portion 12 having the cylindrical surface is provided, the softening of the synthetic resin pipe 1 can be facilitated and the diameter expansion from the vicinity of the tip thereof can be facilitated.

Also in this embodiment, similarly to the above-mentioned embodiment, since the synthetic resin pipe 1 is supported by the cylindrical surface of the inner diameter holding portion 12, it is always pressed vertically to the surface of the base portion 11, and the radial direction is increased. The outward diameter expansion is made uniform. In particular, the processing jig 10 of the present embodiment is provided with the annular concave portion 14, which allows the double flange portion 1a to be easily formed. The processing jig 10 corresponds to the embodiments of claims 5 and 6.

Note that such a double collar portion can also be formed by the processing jig 10 having no annular recess 14. That is, the synthetic resin tube 1 is inserted into the inner diameter holding portion 12 and is pressed against the surface of the base portion 11 while being supported by the cylindrical surface, but at that time,
This is to be performed in a state where a portion slightly inside the tip of the synthetic resin pipe 1 is sufficiently softened. As a result, the diameter of the tip of the synthetic resin pipe 1 is not expanded, and the inside of the synthetic resin pipe 1 is expanded radially outward in a bent shape. Also in this method, since the synthetic resin tube 1 is supported by the cylindrical surface of the inner diameter holding portion 12, it is possible to form the double collar portion 1a having the same diameter as in the above-described embodiment.

As described above, the method of processing the end portion of the synthetic resin pipe and the processing jig of this embodiment have been described with reference to the specific embodiment, but the present invention is not limited to this. It is not a thing but various changes and additions can be made. In particular, although the processing jig 10 is shown as having the simplest shape, the base 11 may have any shape as long as it has a partially flat surface, and the base 11 is It can be assembled on a suitable support or integrated. Also, on the surface of the base 11,
Providing an annular wall that limits the diameter of the formed collar portion 1a,
Means for heating the end of the synthetic resin tube 1 may be added.

<Seventh Embodiment> FIGS. 9 to 12 show a method of processing an end portion of a synthetic resin pipe according to the present invention and a processing jig when a processing jig is used as a third embodiment of the processing jig. FIG. 9 is a cross-sectional view of the processing jig body in a heated state, and FIG.
Reference numeral 0 is a cross-sectional view of the processing jig main body and auxiliary tool in a preheated state, FIG. 11 is a cross-sectional view of the processing jig main body and auxiliary tool in a diameter expansion processing state, and FIG. 12 is processing of a synthetic resin pipe in a molded state. It is a sectional view of a jig main body and an auxiliary tool. In the figure, the same reference numerals and symbols as those in the above-mentioned embodiment indicate the same or corresponding components as those of the above-mentioned embodiment.

As shown in the figure, the processing jig main body 20 is made of metal or ceramics, and has a hollow columnar inner diameter holding portion 22 formed in the center thereof. A through hole 28 is formed at the center of the inner diameter holding portion 22, and a thick portion 27 and a thin portion 29 are formed. A thin portion 29 is formed up to a predetermined distance from a plane perpendicular to the inner diameter holding portion 22 of the base portion 21 of the processing jig body 20, and a thick portion 27 is formed for a predetermined distance. Thick part 2
Reference numeral 7 directly receives heat from the trowel portion 31 through the through hole 28 to the extent that the trowel portion 31 at the tip of the soldering iron 30 can be inserted.
The thin portion 29 increases its temperature by heat transfer from the thick portion 27. Inner diameter holding portion 2 of base portion 21 of processing jig body 20
An annular recess 24 having a partly flat surface is formed on a surface perpendicular to 2 and can accommodate the tip of the synthetic resin pipe 1. A coating 25 made of a heat insulating material is provided on the surface of the grip portion 23 of the processing jig body 20. As a result, the trowel portion 31 at the tip of the soldering iron 30 is inserted into the through hole 28.
When it is attached to the gripping part 23 due to the center of gravity of the soldering iron 30.
With the end of the coating 25 as a fulcrum, the base 21 side of the processing jig main body 20 is floated to prevent its heat transfer. By the way,
The soldering iron 30 used in this embodiment has a power consumption of 30.
[W]. A joining projection 26 is provided outside the base 21 of the processing jig body 20.

The auxiliary tool 40 is formed by an auxiliary main body portion 41 which is entirely made of metal or ceramics, and an annular guide portion 43 which is arranged around the auxiliary main body portion 41 which is entirely made of metal. The auxiliary main body portion 41 has a structure in which a substantially cylindrical shape is vertically divided in its length direction, and an annular concave portion 42 is formed on an end surface of the large diameter portion 41a, and serrations are formed around the annular concave portion 42. And is formed so as to be freely engageable with the large diameter portion 43a of the guide portion 43. In addition, the large diameter portion 4 of the guide portion 43
3a is formed with a threaded recessed groove 44 that fits with the joining projection 26 arranged on the outside of the base portion 21, and by the relative rotation of the processing jig body 20 and the auxiliary tool 40, the processing jig is processed. The tool body 20 and the auxiliary tool 40 are configured to be tightly coupled.

The method of processing the end portion of the synthetic resin pipe of this embodiment and the use of the processing jig will be described.

First, as shown in FIG. 9, the trowel portion 31 at the tip of the soldering iron 30 is inserted into the through hole 28 of the inner diameter holding portion 22 of the processing jig body 20, and the thick portion 27 is heated. on the other hand,
The auxiliary main body 41 divided into two parts is inserted into the guide part 43 to be integrated, and as shown in FIG.
The auxiliary tool 40 including the auxiliary main body portion 41 and the guide portion 43, which are integrated with each other, is inserted from the tip of the auxiliary tool. Next, after a lapse of a predetermined time, or a thermo-label or a thermo-paint is applied to the processing jig main body 20, the temperature state is judged from the hue, and when a predetermined temperature rises, The soldering iron 30 is detached from the auxiliary body 41. And FIG.
As shown in FIG.
It is inserted in the inner diameter holding portion 22 of 0. The inserted synthetic resin tube 1 is heated by the heat of the thick portion 27 and the thin portion 29. Since the thick portion 27 has a large heat capacity, the corresponding portion of the thick portion 27 of the synthetic resin pipe 1 is softened, and the corresponding portion of the thin portion 29 is softened slowly.

Here, when the corresponding portion of the thick portion 27 of the synthetic resin pipe 1 is appropriately softened, when the synthetic resin pipe 1 is pressed toward the processing jig body 20, as shown in FIG. Since the end portion of the synthetic resin pipe 1 is housed in the annular recess 24 and the tip end portion thereof is locked, the softened portion double bulges outward in the radial direction and expands in diameter. In this state, the threaded recessed groove 44 of the guide portion 43 and the joint projection 26 arranged outside the base portion 21 are fitted to each other, and the processing jig body 20 and the auxiliary tool 4 are engaged.
The jig main body 20 for processing and the auxiliary tool 40 are rotated relative to each other so that the connection of 0 is tight. As a result, as shown in FIG. 12, the processing jig main body 20 and the auxiliary tool 40 are tightly coupled to each other, and the annular concave portion 24 formed at the base end of the inner diameter holding portion 22 and the end surface of the large diameter portion 41a are formed. Due to the annular recess 42, the diameter of the synthetic resin pipe 1 is increased uniformly, and the double flange portion 1a is closely attached.
Can be formed. In particular, since the auxiliary tool 40 side is not heated, it is possible to form the double collar portion 1a on the synthetic resin tube 1 and take it out by a quick molding operation.

In order to take out the synthetic resin pipe 1 having the double collar 1a formed therein, first, the coupling between the processing jig main body 20, the threaded concave groove 44 of the auxiliary tool 40 and the joint projection 26 is released. Then, the processing jig body 20 is removed. Then, in order to separate the guide part 43 and the auxiliary body part 41 which form the auxiliary tool 40, only the guide part 43 is slid in the direction of the serration groove in the direction opposite to the collar part 1a of the synthetic resin pipe 1, and the auxiliary part is there. Body part 41
Is divided into two and separated from both sides of the synthetic resin pipe 1. Then, only the guide portion 43 is moved in the direction of the collar portion 1a of the synthetic resin pipe 1 to separate it.

In this embodiment, the auxiliary main body portion 41 is divided into two parts to avoid the trouble of pulling it out from the end portion of the synthetic resin pipe 1 in the opposite direction of the collar portion 1a, and to facilitate the removal.
When practicing the present invention, when the synthetic resin pipe 1 is pulled out from the end portion in the opposite direction of the collar portion 1a, it is not always necessary to divide the auxiliary main body portion 41 into two.

As described above, the jig for processing the end of the synthetic resin pipe of this embodiment is a jig main body for partially heating the end of the synthetic resin pipe 1 by the thick portion 27 to soften it. 20 means and the softened synthetic resin pipe 1 are fitted to the inner diameter holding portion 22 holding the inner diameter thereof, and are pressed against the surface of the base portion 21 in the direction perpendicular to the inner diameter holding portion 22, Means including the base portion 21 of the processing jig main body 20 for expanding the diameter of the softened portion of the synthetic resin tube 1 and the base of the inner diameter holding portion 22 for molding the softened portion of the expanded diameter synthetic resin tube 1 into the collar portion 1a. It comprises an annular recess 24 formed at the end and a means comprising an annular recess 42 formed at the end surface of the large diameter portion 41a, which can be an embodiment corresponding to claims 5 to 7. .

Therefore, the vicinity of the end of the synthetic resin pipe 1 is softened by heating, and in a state where the synthetic resin pipe 1 is fitted and supported by the cylindrical inner diameter holding portion 22, a flat surface perpendicular to the cylindrical surface is formed. The flange portion 1a is formed by pressing the surface of the synthetic resin pipe 1 toward the base portion 21 side, thereby expanding the diameter of the synthetic resin pipe 1 in the vicinity of the tip portion thereof, and since the collar portion 1a is supported by the cylindrical surface, Inner diameter holding portion 2 having annular recess 24
It is possible to press against 2, and as a result, the diameter can be uniformly expanded outward in the radial direction. Further, since the auxiliary tool 40 lowers the temperature of the softened portion of the synthetic resin tube 1, stable molding of the collar portion 1a is facilitated, and workability is good in view of its curing speed. Further, since the collar portion 1a is formed by the annular concave portion 24 and the annular concave portion 42, even if the flange portion 1a cannot be formed to have a uniform diameter, it can be accurately held between the connected body 2 and the cover nut 3.

Particularly, by connecting the processing jig body 20 and the auxiliary tool 40, the diameter of the synthetic resin tube 1 can be uniformly expanded, and the closely-engaged double collar portion 1a with high dimensional accuracy can be accurately formed. Moreover, since the auxiliary tool 40 is not heated, it is possible to form the double collar portion 1a on the synthetic resin pipe 1 and take it out by a quick molding operation. In this embodiment, since the collar portion 1a of the synthetic resin pipe 1 is formed in a double shape having a crushed U-shaped cross section, the collar portion 1a is formed in such a double shape. The strength of the collar portion 1a can be further increased, and therefore, the connection strength between the synthetic resin tube 1 and the connected body 2 can be further improved. Further, the collar portion 1a has elasticity in the thickness direction because the brim portion 1a is bent in a U shape in which the cross-sectional shape is crushed, and can absorb expansion and contraction of the synthetic resin pipe 1 due to temperature change. it can.

When forming the double collar portion 1a in this embodiment, the heating is stopped.
In the case of carrying out the present invention, reheating can be performed to correct and shape the shape of the collar portion 1a.

<Eighth Embodiment> FIG. 13 shows a fourth embodiment of the method for processing the end portion of the synthetic resin pipe and the processing jig of the present invention. It is sectional drawing of a tool. It should be noted that, in the drawings, the same reference numerals and symbols as those in the above-mentioned embodiment indicate the same or corresponding components as those in the above-mentioned embodiment, and therefore, duplicated explanations are omitted here.

In the figure, a through hole 28 is formed in the center of the inner diameter holding portion 22 protruding in the center of the processing jig body 20, and a thick portion 27A and a thin portion 29A are formed. The thick portion 27A directly receives the heat from the trowel portion 31 through the through hole 28 to which the trowel portion 31 at the tip of the soldering iron 30 can be inserted. The thin portion 29A increases its temperature by heat transfer from the thick portion 27A. In the present embodiment, the thick portion 27A is formed by a predetermined distance from the base end of the inner diameter holding portion 22 in order to heat and soften the tip of the synthetic resin pipe 1. The tip of the inner diameter holding portion 22 has a thin portion 29A.
Has become. A rounded portion 24B having a predetermined curvature is formed on the base 21 side of the inner diameter holding portion 22 of the processing jig body 20.

The auxiliary tool 40 is composed of an auxiliary main body portion 41A which is entirely made of metal or ceramics, and an annular guide portion 43 which is arranged around the auxiliary main body portion 41A which is entirely made of metal. The auxiliary main body portion 41A has a structure in which a substantially cylindrical shape is vertically split, and the end surface of the large diameter portion 41a is a flat surface, and the annular recessed portion 42 is not formed unlike the above-described embodiment.

Particularly, in the synthetic resin pipe connecting device of this embodiment, the processing jig body 20 and the auxiliary tool 40 are joined together,
The end portion of the synthetic resin pipe 1 can be pushed thereinto to form the collar portion 1a. That is, the single collar portion 1a in the present embodiment.
When forming, it may be in a state where heating is stopped,
The heating may be continued. At this time, the annular recess 24A may be the annular recess of the auxiliary tool 40, or may be formed in both.

Therefore, with the processing jig of this embodiment, as shown in FIGS. 5 and 6, it is possible to obtain the flange 1a at the end of the synthetic resin tube 1 with a single diameter enlarged.
Further, since the rounded portion 24B is formed on the base end 21 of the inner diameter holding portion 22, the surface of the base end of the inner diameter holding portion 22 is gently curved and continuous with the surface of the base portion 21. Without partially reducing the mechanical strength,
The single collar portion can be easily formed at the end of the synthetic resin pipe.

This embodiment can be an embodiment corresponding to claims 5 to 7.

[0093]

As described above, in the connecting device for the synthetic resin pipe according to the first aspect of the present invention, the flange portion of the synthetic resin pipe covers the end face of the connected body and the cover by screwing the cover nut onto the connected body and tightening the cover nut. Since it is sandwiched between the nut and the synthetic resin pipe is connected to the connected object, the collar part of the synthetic resin pipe prevents the synthetic resin pipe from coming off, and the synthetic resin pipe is firmly connected without pulling out. Just by screwing and tightening on the connected body, the flange part of the synthetic resin pipe is sandwiched between the end surface of the connected body and the cover nut, and the flange part of the synthetic resin pipe prevents it from coming off the connected body. Once connected, the synthetic resin pipe can be reliably prevented from being pulled out, and the synthetic resin pipe can be firmly connected. Further, since it is reliably prevented from coming off, it is not necessary to pay particular attention to the tightening force of the cover nut, so that the connecting operation of the synthetic resin pipe can be easily performed.

In the connecting device for synthetic resin pipes according to the second aspect, the cover nut is screwed onto the body to be connected and tightened,
The reduced diameter portion of the sleeve is reduced in diameter and pressed against the synthetic resin pipe, and the flange portion of the synthetic resin pipe is sandwiched between the flange portion of the sleeve and the end surface of the connected body, and the synthetic resin pipe is connected to the connected body. Connected to. Therefore, the flange portion of the synthetic resin pipe serves as a stopper and the synthetic resin pipe is firmly connected without being pulled out.

Therefore, in addition to the same effect as that of the invention of claim 1, since the end portion of the synthetic resin pipe is supported and reinforced by the sleeve, even if an external force such as bending is applied to the synthetic resin pipe after piping. The stress is relieved from reaching the gripping portion of the collar portion, whereby the connecting force of the synthetic resin pipe can be maintained.

According to the third aspect of the present invention, in the synthetic resin pipe connecting device, since the synthetic resin pipe has a solid cylindrical receiving guide portion that is inserted inside the synthetic resin pipe and supports the synthetic resin pipe, The reliability of connection with the end face of the connected body can be improved.

Therefore, in addition to the effect of claim 1 or claim 2, since the end portion of the synthetic resin pipe is supported and reinforced from the inside by this receiving guide portion, it is bent to the synthetic resin pipe after the piping. Even if an external force is applied, the stress is relieved from reaching the gripping portion of the collar portion, whereby the connecting force of the synthetic resin pipe can be maintained. Further, the socket guide portion facilitates positioning when connecting the synthetic resin pipe to the connected body. Then, the end portion of the synthetic resin pipe can be supported and reinforced from the inside by this socket guide member.

According to the connecting device of the synthetic resin pipe of claim 4, in addition to the effect of any one of claims 1 to 3, an elastic material is provided between the collar portion of the synthetic resin pipe and the end face of the connected body. Since the sealing member made of is disposed, the sealing member can further enhance the sealing effect of the connecting portion between the synthetic resin pipe and the connected member.

According to a fifth aspect of the present invention, there is provided a method for processing an end portion of a synthetic resin pipe, wherein the end portion of the softened synthetic resin pipe is pressed against the surface, and the softened portion is expanded radially outward to expand the diameter of the synthetic resin pipe. Since the softened part of the pipe is molded into the collar part,
The synthetic resin pipe is always pressed perpendicularly to the surface, so that the diameter expansion is made uniform.

Therefore, the end portion of the synthetic resin pipe is heated and softened, and the softened end of the synthetic resin pipe is pressed against the flat surface perpendicular to the cylindrical surface of the synthetic resin pipe, whereby the synthetic resin pipe is Since the flange part is formed by expanding the diameter of the end part, it is possible to easily form the flange part at the piping site by simply pressing the synthetic resin pipe without requiring special skills. You can Then, this flange portion can be uniformly pressed and expanded to form a flange portion having an expanded diameter.

According to a sixth aspect of the present invention, there is provided a jig for processing an end portion of a synthetic resin pipe, wherein the end portion of the softened synthetic resin pipe is pressed against the surface, and the softened portion is pushed outward in the radial direction, thereby expanding the diameter. The flange portion can be easily formed at the end of the synthetic resin pipe by using this processing jig, and the flange portion can be formed by using the synthetic resin pipe. Since it can be supported, the synthetic resin pipe is always pressed perpendicularly to the surface, so that the diameter expansion can be made uniform.

The jig for processing the end portion of the synthetic resin pipe according to claim 7 presses the end portion of the softened synthetic resin pipe against the surface by heating and pushes the softened portion outward in the radial direction,
As a result, a flange portion having an enlarged diameter is formed. In addition, since the collar portion can be formed while supporting the synthetic resin pipe, the synthetic resin pipe is always pressed vertically against the flat surface, whereby the diameter expansion can be uniformly formed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a synthetic resin pipe connecting device of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the synthetic resin pipe connecting device of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the synthetic resin pipe connecting device of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the synthetic resin pipe connecting device of the present invention.

FIG. 5 is a perspective view showing a first embodiment of a method of processing an end portion of a synthetic resin pipe and a processing jig of the present invention.

FIG. 6 is a sectional view of FIG.

FIG. 7 is a perspective view showing a second embodiment of a method for processing an end portion of a synthetic resin pipe and a processing jig of the present invention.

FIG. 8 is a sectional view of FIG. 7.

FIG. 9 is a cross-sectional view of a processing jig body in a heated state showing a third embodiment of the processing method and the processing jig of the end portion of the synthetic resin pipe of the present invention.

FIG. 10 is a cross-sectional view of a processing jig main body and an auxiliary tool in a preheated state of a synthetic resin pipe showing a third embodiment of the processing method and the processing jig of the end portion of the synthetic resin pipe of the present invention. is there.

FIG. 11 is a cross-sectional view of a processing jig main body and an auxiliary tool in a diameter-expanded processing state of a synthetic resin pipe showing a third embodiment of the processing method and the processing jig of the end portion of the synthetic resin pipe of the present invention. It is a figure.

FIG. 12 is a cross-sectional view of a jig main body for processing a synthetic resin pipe and an auxiliary tool showing a third embodiment of the method for processing the end portion of the synthetic resin pipe and the processing jig of the present invention. is there.

FIG. 13 is a cross-sectional view of a jig body for processing a synthetic resin pipe and an auxiliary tool showing a fourth embodiment of a method for processing an end portion of a synthetic resin pipe and a processing jig of the present invention. is there.

FIG. 14 is a cross-sectional view showing a conventional synthetic resin pipe connecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 synthetic resin pipe 1a collar part 2 connected body 2a male screw 2c socket guide part 3 cover nut 3a female screw 3b inner hole 4 sleeve 4a reduced diameter part 5 seal member 6 socket guide member 10 processing jig 11 base part 12 Inner diameter holding part 13 R part 14 Annular recess 20 Processing jig body 40 Auxiliary tool

Claims (7)

[Claims] 1. A synthetic resin pipe having a flange formed at an end thereof, a connected body having a male screw, and a female screw screwed into the male screw of the connected body, and the female screw is tightened. Thus, a cover nut for sandwiching the flange portion of the inserted synthetic resin pipe with the end face of the connected body and connecting the synthetic resin pipe to the connected body is provided. Connection device for synthetic resin pipes. 2. A synthetic resin pipe having a flange portion at its end, a connected body having a male screw, a sleeve having a tapered reduced diameter portion, and a male screw of the connected body. By forming a female screw and tightening the female screw, the reduced diameter portion of the sleeve is reduced in diameter and pressed against the synthetic resin pipe, and the flange portion of the inserted synthetic resin pipe is attached to the end surface of the connected body. And a cover nut which is sandwiched between the cover nut and the cover nut for connecting the synthetic resin pipe to the connected body. 3. The connection target body has a tubular socket guide portion that is inserted inside the synthetic resin pipe and supports the synthetic resin pipe. Connection device for synthetic resin pipes. 4. A seal member made of an elastic material is arranged between the collar portion of the synthetic resin pipe and the end surface of the connected body, and the sealing member is arranged in the seal member. The connection device for synthetic resin pipes according to item 1. 5. A step of heating an end portion of a synthetic resin pipe to soften it, wherein the softened synthetic resin pipe is fitted to an inner diameter holding portion for holding the inner diameter thereof and is perpendicular to the inner diameter holding portion. End of the synthetic resin pipe, which comprises pressing the surface of the synthetic resin pipe to expand the diameter of the softened part of the synthetic resin pipe, and molding the softened part of the expanded synthetic resin pipe into a collar portion. Part processing method. 6. A synthetic resin pipe, in which an end portion of the synthetic resin pipe is partially heated and softened, is fitted in an inner diameter holding portion for holding the inner diameter thereof, and is perpendicular to the inner diameter holding portion. Of the synthetic resin pipe, and means for expanding the softened portion of the synthetic resin pipe to form a flange portion on the softened portion of the expanded synthetic resin pipe. End processing jig. 7. A means for partially heating an end portion of a synthetic resin pipe to soften it, and the inner diameter holding portion with the softened synthetic resin pipe fitted to an inner diameter holding portion for holding the inner diameter thereof. And a means for expanding the softened portion of the synthetic resin pipe into a flange portion, and a means for molding the softened portion of the expanded synthetic resin pipe into a collar portion. A jig for processing the end of a synthetic resin pipe.