JP2001074192A - Opening closure device for resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe opening closure device used for closing a pipe end at a terminal of a pipe line which is already laid, when interrupting underground piping work and to enable connection of a new resin pipe after detaching the opening closure device immediately without cutting and removing the pipe end. SOLUTION: This opening closure device for a resin pipe is provided with: a cylindrical body 20 externally fitted to a resin pipe end 110 for keeping the shape of the resin pipe end 110; a surface plate 10 for closing a pipe opening 120; a support body 30 arranged inside the resin pipe end 110; a coming-off preventive member 60 sandwiching retaining the resin pipe end 110 interlocking with the cylindrical body 20; a positioning mechanism M1 for positioning the coming-off preventive member 60 while preventing its axial movement. The coming-off preventive member 60 is arranged inside the resin pipe 100. The fastening (positioning) mechanism M1 is arranged on only one position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for closing a mouth of a resin tube.

[0002]

2. Description of the Related Art When a fluid pipe such as a pipe for gas or water is constructed, there is a case where the construction is temporarily interrupted by constructing only a part of the pipe. In this case, it is desirable to close the port at the end of the already installed pipe to prevent animals and foreign substances from entering the pipe. In particular, it is necessary to prevent intrusion of earth and sand and infiltration of rainwater in underground piping such as piping for gas or water to be embedded.

FIG. 7 shows a use state of a conventional port closing device used for this purpose. This port closure device
A cap 1 attached to a resin pipe 100 such as a polyethylene pipe used for pipes of gas, water, and the like, covered over a pipe port 120, and a jacket 1 a of the cap 1 and a cap 1
Member 2, a protective ring 3, and a seal member 4 made of a rubber ring disposed between the resin pipe end 110 covered with the resin pipe.
And a push ring 5 externally fitted to the resin pipe end 110, a connecting tool 6 made of a bushing connected to an opening formed in the face plate 1 b of the cap 1, and provided inside the resin pipe end 110. And a stiffener 7. The flanges 1c and 5a of the cap 1 and the pressing wheel 5 are fastened by a fastening tool 8 including a fastening bolt and a nut.
For this reason, the pressing ring 5 presses the retaining member 2, the protective ring 3, and the sealing member 4 made of a rubber ring. When the retaining member 2 and the like are pressed in this way, the retaining member 2 is pressed by the tapered surface 1d on the inner periphery of the outer jacket portion 1a to reduce the diameter, and the sealing material 4 is compressed and the outer peripheral surface of the resin tube end portion 110 is compressed. To close the gap between the resin tube end 110 and the outer jacket 1a. Since the retaining member 2 has the biting teeth 2a on its inner peripheral side, when the retaining member 2 is pressed by the pressing ring 5 as described above, the biting teeth 2a are formed.
The “a” bites into the outer peripheral portion of the resin tube end portion 110 and exerts a large retaining force. The connector 6 is used as an air supply port when performing a pressure test or air tightness inspection of the installed pipe, and when it is not necessary to perform such an inspection, a plug 9 is attached to the connector 6 and the plug 9 is attached. The passage is blocked.

[0004]

When the conventional port closing device described with reference to FIG. 7 is used, even if the resin pipe end 110 is retained from the inside by the stiffener 7, the retaining member 2 and the protection ring When the sealing member 3 and the sealing material 4 are removed, the pressing traces thereof remain on the outer peripheral surface of the resin tube end 110 as irregularities, and the biting traces of the biting teeth 2a of the retaining member 2 remain as scratches. For this reason, when the pipe construction is restarted and a new resin pipe end is to be connected to the resin pipe end 110, the pressed traces and biting traces become obstacles, and a good connection state cannot be obtained. In particular, when it is necessary to connect by adopting a connection means by electrofusion, the pressing traces and biting traces may become obstacles, and the connection may not be possible. Therefore, conventionally, the connection work is performed after cutting and removing the resin pipe end 110 on which such a pressing mark or a biting mark remains.

[0005] Further, the tooth height of the biting teeth 2a is limited in order to minimize the biting traces of the biting teeth 2a of the retaining member 2 remaining on the outer peripheral surface of the resin pipe end 110,
Since it was difficult to improve the airtight reliability at the biting portion of the biting teeth 2a, the pressure resistance and the airtightness were 0.1MPa.
There is a problem that it is suppressed to about a.

Further, there is a problem that not only the outer jacket 1a of the cap 1 and the like protrudes largely outside the resin tube end portion 110, but also the size at the time of mounting becomes large and the weight becomes considerably heavy.

In addition, since there are a plurality of places to be tightened by the fasteners 8 around the cap 1 and the pressing ring 5, the number of places for fastening the bolts used as the fasteners 8 is increased and the work is troublesome. there were.

The present invention has been made in view of the above situation and problems, and a main element for retaining the resin tube is set inside the end of the resin tube so that the resin tube can be removed after the resin tube is removed. It is an object of the present invention to provide a resin tube port closing device which can be immediately connected to another resin tube end without cutting the end.

Another object of the present invention is to provide a device for closing a mouth of a resin tube which does not become large when mounted.

It is a further object of the present invention to provide a device for closing a mouth of a resin pipe, which requires only one tightening operation while using a tightening mechanism.

A further object of the present invention is to provide a device for closing a mouth of a resin tube which can improve pressure resistance and airtightness as compared with the prior art.

[0012]

According to a first aspect of the present invention, there is provided a tube closing device for a resin tube, which is fitted over a resin tube end portion 110 so as to overlap with the resin tube end portion 110 to keep the resin tube end portion 110 in an initial shape. Body 2
0, the face plate 10 that closes the opening 120 of the resin pipe, the support 30 provided inside the resin pipe end 110, and the resin pipe end 110 provided inside the resin pipe end 110. A retaining member 60 which cooperates with the cylindrical body 20 to hold the pressure;
The retaining member 60 is connected to the face plate 10 and the support 30.
And a positioning mechanism M2 for positioning so as not to move in the axial direction of the motor.

According to this tube closing device, the main elements such as the support and the retaining member are provided inside the resin tube end, and the retaining member provided inside the resin tube end is provided outside the resin tube end. It cooperates with the cylindrical body which is fitted over the outside so as to pinch and hold the end of the resin pipe, so even after removing this device,
A situation in which a pressing mark remains as unevenness on the outer peripheral surface of the resin tube end does not occur. For this reason, it is possible to immediately connect to another resin pipe end without cutting the resin pipe end after removing this device. Nevertheless, since the retaining member is positioned by the positioning mechanism so as not to move in the axial direction of the face plate or the support, the end of the resin pipe may be misaligned with respect to the device or fall out of the device. There is no.

Further, when the retaining member is provided with the biting teeth 61 biting into the inner peripheral portion of the resin tube end 110, even if the tooth height of the biting teeth 61 is increased, the resin tube end is not affected. Part 110
Only remains on the inner peripheral surface of the resin tube, and no engraving remains on the outer peripheral surface of the resin tube end where flatness is required for connection of the resin tube. Therefore, by increasing the tooth height of the biting teeth, it is possible to increase the contact area between the biting teeth and the resin layer of the resin tube, thereby improving the pressure resistance and airtightness.

The apparatus for closing a mouth of a resin pipe according to the present invention comprises a ring-shaped member 5 which is axially movably fitted to the support 30 and faces the face plate 10 with the retaining member 60 interposed therebetween.
0, and a tightening mechanism M1 for tightening the support 30 and the face plate 10 in a direction in which they approach each other,
The support 30 is provided with an engaging portion 34 for locking and positioning the annular member 50 externally fitted to the support 30, and the annular member 50 is attached to the annular portion 50 by the engaging portion 34. It is possible to adopt a configuration in which an action portion 53 is provided which cooperates with the receiving portion 11 provided on the face plate 10 to pinch the retaining member 60 when locked. In that case, the positioning mechanism M2
Is formed by the tightening mechanism M1, the engaging portion 34 provided on the support 30, the annular member 50 having the action portion 53, and the face plate 10.

Further, the retaining member 60 is formed of a cylindrical member having elasticity and capable of expanding and contracting the diameter, and an action portion 53 of the ring-shaped member 50 to which one end of the retaining member 60 comes into contact. And the receiving portion 11 of the face plate 10 against which the other end of the retaining member 60 abuts is provided with an outwardly extending inclined surface, and when the annular member 50 is moved closer to the face plate 10. It is desirable that the retaining member 60 sandwiched between the receiving portion 11 and the inclined surface of the action portion 53 expands in diameter against its elasticity.

With this arrangement, if the ring-shaped member and the face plate are kept away from each other, the retaining member sandwiched between the action portion and the receiving portion is reduced in diameter by its elasticity. A wide space between the retaining member and the tubular body is ensured. Therefore, even when the end of the resin pipe is inserted between the tubular body and the retaining member, when the support or the retaining member is inserted inside the end of the resin pipe to which the tubular body is fitted. However, the insertion work can be easily and easily performed without being hindered by the retaining member. In order to move the annular member closer to the face plate, a tightening mechanism for tightening the support and the face plate in a direction in which they approach each other is used. That is, when the support and the face plate are tightened by the tightening mechanism, the ring-shaped member is locked to the engaging portion provided on the support, so that the ring-shaped member comes close to the face plate together with the support.

The cylindrical body 20 and the face plate 10 are integrally formed, and the face plate 10 has an opening 12 through which a shaft 40 provided integrally with the support 30 is inserted. It is desirable. Further, the tightening mechanism M1
However, it is desirable that the nut is formed by a male screw 41 formed on the shaft body 40 and a nut body 42 screwed into the male screw 41 to press the face plate 10 and close the opening 12.

With this configuration, the tubular body, the face plate, and the support can be integrally treated only by passing the shaft through the opening of the face plate and screwing the nut into the male screw. Become. In this case, if the retaining member is externally fitted to the support so as to be movable in the axial direction, the retaining member can also be handled integrally with the face plate, the support, and the like.

The face plate 10 is provided with an opening 12 through which a shaft 40 provided integrally with the support 30 is inserted. The shaft 40 and the support 30 are provided with an internal passage of a resin pipe. A fluid passage 43 communicating with the end of the resin tube 1 is formed. A plug 45 for closing the fluid passage 43 is detachable from the shaft 40, and the resin tube end 1 with the tubular body 20 fitted externally.
A seal member 70 for closing a gap between the support 10 and the support 30 may be provided.

According to this configuration, by using the fluid passage formed in the shaft and the support to supply air to the internal passage of the resin tube, it is possible to perform a pressure resistance test and an air tightness test. In addition, if the fluid passage is closed with the plug, no earth and sand, animals and foreign matter enter the resin pipe, and no groundwater enters.

The support 30 is provided with a rising surface 36 which is inclined in a tapered shape, and is fitted to the support 30 when the support 50 is moved closer to the face plate 10. Annular sealing material 70
It is preferable that a pressing surface 54 is provided to increase the diameter by back-pressing and sliding along the riding surface 36.

In this device, if the seal member is positioned on the small diameter side of the riding surface by keeping the ring-shaped member and the face plate apart from each other, the seal member is reduced in diameter, and the seal member and the cylindrical body are reduced. And the interval between them is widened. Therefore, even when the end of the resin pipe is inserted between the tubular body and the retaining member, the support or the sealing material is inserted inside the end of the resin pipe in which the tubular body is fitted. Even if they do, they can be easily and easily performed without being obstructed by the sealing material.

In the present invention, the tightening mechanism M1 is provided between the male screw 41 formed on the shaft body 40, the nut body 42 screwed into the male screw 41, and the face plate 10 and the nut body 42. The nut body 42 is preferably formed by a spring body 80 that resiliently urges the nut body 42 in a direction away from the face plate 10. In that case,
The spring body 80 is a coil spring, and washers 81, 82 are provided between the coil spring and the face plate 10 and the nut body 42.
Is desirably interposed.

According to this structure, a fixed tightening torque can be obtained by the elastic urging force of the spring body only by screwing the nut body into the vicinity of the specified position of the male screw of the shaft body. Therefore, management of the tightening torque of the nut body when attaching the device to the end of the resin pipe (torque management)
Is easier to do. Further, it becomes easy to temporarily hold the elements such as the support, the ring-shaped member, and the retaining member integrally. Further, even if the face plate or the like once expands due to the internal pressure of the resin pipe during the pressure test of the resin pipe and then returns to the original shape, the situation where the nut body is loosened does not occur.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial longitudinal sectional side view showing a use state of a resin pipe closing device according to the present invention, FIG. 2 is an enlarged sectional view of a main part of FIG. 1, and FIG. FIG. 4 is an enlarged sectional view showing the position of the retaining member 60 before the M1 is tightened, and FIG. 4 is a partial vertical sectional side view of the device before being attached to the end of the resin pipe.

As shown in FIGS. 1 and 4, the pipe mouth closing device is formed by joining a circular face plate 10 having substantially the same diameter as the outer diameter of the resin pipe end 110 to the outer peripheral edge of the face plate 10 by welding or the like. And a cylindrical tubular body 20 which is integrated. An opening 12 is formed at the center of the face plate 10. The inner peripheral surface of the tubular body 20 is smooth. For this reason, as shown in FIG.
10, the outer peripheral portion of the face plate 10 is brought into contact with the end surface of the resin tube end 110 to close the tube opening 120, and the force for pushing and expanding the resin tube end 110 is obtained. Is added, the end portion 110 of the resin tube is kept in the initial shape of a circle by the tubular body 20. An annular receiving portion 11 is provided on the back surface of the face plate 10. The receiving portion 11 is formed by a tapered inclined surface 11a that spreads forward and an inner surface 11b of the face plate outside the inclined surface 11a (see FIG. 3). The inner diameter of the cylindrical body 20 is set to such a size that the cylindrical body 20 can be easily fitted to the resin tube end 110, and that when the outer fitting is performed, a large play is not formed between the two. Have.

The support 30 integrally has a disk-shaped front plate portion 31 and a cylindrical portion 32 projecting rearward from the outer peripheral portion of the front plate portion 31. The shaft body 40 protruding forward is fixed integrally. The support 30 is inserted into the resin tube end 110 and is provided inside the resin tube end 110.
As shown in FIG. 2 and FIG. 3 in an enlarged manner, the outer peripheral surface of the cylindrical portion 32 sequentially extends from the front side to the rear side and a straight surface 33 parallel to the axis and a right angle from the straight surface 33. An engagement portion 34 formed of an annular stepped surface, and a straight surface 3 parallel to an axis protruding from the outer periphery of the engagement portion 34.
5 and a rising surface 36 that extends from the straight surface 35 and then expands and is inclined in a tapered shape.
At the rear end of the climbing surface 36, a flange portion 37 for preventing a sealing material 70 described later from falling out is provided. Also,
The shaft body 40 has a male screw 41 on its outer peripheral surface,
The nut body 42 can be screwed into the male screw 41, and the opening 12
The nut body 42
Has a size to close the opening 12. Further, the shaft body 40 has a through passage, and a fluid passage 43 is formed by the through passage and the internal space of the tubular portion 32. Further, a female screw 44 is provided on the shaft body 40, and a plug 45 for closing the fluid passage 43 can be detachably mounted using the female screw 44.

The annular member 50 is externally fitted to the cylindrical portion 32 of the support 30. Specifically, an annular convex portion 51 protruding inward is provided on the inner peripheral portion front side of the ring-shaped member 50,
The convex portion 51 is slidably fitted on the straight surface 33 provided on the cylindrical portion 32 of the support 30.
The rear surface 52 of the convex portion 51 can be engaged with the engaging portion 34 of the tubular portion 32. When the rear surface 52 is locked to the engaging portion 34 as shown in FIG. Is not retracted backward from the engagement position. Further, the ring-shaped member 50 is provided with an action portion 53. The acting portion 53 is formed by a tapered inclined surface that extends rearward as shown in FIG. For this reason, when the shaft body 40 of the support 30 to which the ring-shaped member 50 is fitted is inserted into the opening 12 of the face plate 10, as shown in FIG. The tapered front-spreading inclined surface forming the receiving portion 11 cooperates to form an outwardly-spreading inclined surface. Further, an annular rear end surface of the ring-shaped member 50 is formed as a pressing surface 54 for pushing a sealing material 70 described later.

The retaining member 60 is formed of a metal tubular member having elasticity and capable of expanding and reducing the diameter.
Specifically, it is formed in a cylindrical shape with a metal having elasticity in which one portion in the circumferential direction is omitted, and as shown in FIG. At the same time, a tapered sliding surface 62 is provided at the front end on the inner peripheral side, and one end surface thereof is formed as a contact surface 63.

A ring-shaped rubber ring is used as the seal member 70, and an annular recess 71 is provided on the rear surface side of the seal member 70 in the illustrated example.

Next, an example of a procedure for attaching the above-described pipe opening closing device to the resin pipe end 110 will be described.

As shown in FIG. 4, the annular member 50 is fitted into the cylindrical portion 32 of the support 30 and a seal member 70 is fitted between the annular member 50 and the riding surface 36 of the cylindrical portion 32. Leave. Next, the support 30 is inserted into the opening 12 of the face plate 10.
The nut body 42 is slightly screwed into the male screw 41 of the shaft body 40 through the shaft body 40 on the side. In this way, the ring-shaped member 50 having the action portion 53 and the face plate 10 having the receiving portion 11 face each other in the axial direction thereof, and thus the action portion 53 of the ring-shaped member 50 and the receiving portion of the face plate 10 facing each other. The retaining member 60 is fitted into the space 11. When the retaining member 60 is fitted in this way, one end of the retaining member 60 comes into contact with the action portion 53 and the sliding surface 62 at the other end (front end) comes into contact with the receiving portion 11. 60 is positioned in a centered state.

In this way, the ring-shaped member 50 and the sealing material 70 are held by the support 30, and the face plate 10 having the cylindrical body 20 and the support 30 are integrally formed via the shaft 40 and the nut 42. After being assembled, the retaining member 60 is assembled between the ring-shaped member 50 and the face plate 10, so that the entirety of the port closing device can be handled as a single unit. Further, in the pipe mouth closing device assembled in this manner, the distance a between the cylindrical body 20 and the retaining member 60 shown in FIG.
Is equal to or slightly wider than the pipe wall thickness b.
Similarly, the distance between the sealing member 70 and the flange 37 of the support 30 and the cylindrical body 20 is equal to or slightly larger than the tube wall thickness b of the resin tube end 110. Therefore, the resin tube end 110 can be easily inserted between the tubular body 20 and the retaining member 60 without being hindered by the ring-shaped member 50, the seal member 70, the flange 37, and the like.

After inserting the resin tube end 110 in this way,
When the nut body 42 is tightened while maintaining the state in which the face plate 10 is pressed against the end face of the pipe port 120, the nut body 4
2 pulls out the shaft body 40 from the opening 12 while pressing the face plate 10, so that the support 30 gradually approaches the face plate 10. When the support 30 approaches the face plate 10 in this manner, one end of the retaining ring 60 is in contact with the action portion 53 of the ring 50, so that the ring 50 is relatively positioned with respect to the support 30. And the convex portion 51 is locked by the engaging portion 34 on the support 30 side. Thereafter, when the nut body 42 is further tightened, the support 30 moves closer to the face plate 10 together with the ring-shaped member 50, and the inclined surface 11 a of the receiving portion 11 of the face plate 10 and the action portion 53 of the ring-shaped member 50 are moved.
The retaining member 60 sandwiched by the
While maintaining the centripetal state with the first inclined surface 11a and the acting portion 53, the diameter is increased against its elasticity while sliding. Therefore, as shown in FIG. 1, the biting teeth 61 of the retaining member 60 eventually bite into the inner peripheral surface of the resin tube end 110, and the retaining member 60 is connected to the cylindrical body 20. Cooperate with resin pipe end 1
10 is clamped and held. In this state, since the retaining member 60 is positioned so as not to move in the axial direction, the resin pipe end 110 does not come out of the port closing device. Further, since the mouth 120 is closed by the face plate 10 and the nut body 42, there is no possibility that animals and earth and sand enter the inside of the tube from the mouth 120.

Here, a tightening mechanism M1 for tightening the support 30 and the face plate 10 in a direction in which they approach each other is formed by the male screw 41 and the nut body 42 of the shaft body 40 described above. Further, a positioning mechanism M2 for positioning the retaining member 60 so as not to move in the axial direction by the tightening mechanism M1, the engaging portion 34 of the support 30, the annular member 50 having the action portion 53, and the face plate 10 is provided. Is formed.

On the other hand, by tightening the nut body 42,
When the ring-shaped member 50 retreats relatively to the support 30 as described above, the pressing surface 54 of the ring-shaped member 50 pushes the sealing material 70, so that the sealing material 70 is a riding surface of the support 30. Sliding along 36 gradually increases the diameter. As a result, the sealing material 70 is lifted from the riding surface 36.
And the resin pipe end 110 in close contact with each other in a compressed state to close the gap therebetween.

For this reason, when a fluid (pressure gas) is sent to the internal passage of the resin pipe 100 by using the fluid passage 43 provided in the shaft 40 and the support 30 as an air supply port,
It is possible to perform a pressure resistance test and an air tightness test on already installed pipes. In the pressure resistance test and the airtightness test, since the seal member 70 has the annular concave portion 71 facing the internal passage of the resin tube 100, the seal member 70 rides on the rising surface 36 and the end of the resin tube due to the internal pressure of the resin tube 100. It acts so as to be pressed against the inner peripheral surface of the portion 110. For this reason, the sealing property at the contact portion of the sealing material 70 is improved. The fluid passage 43 is closed by the plug 45 after the inspection is completed.

When detaching the pipe closing device from the resin pipe end 110, the nut body 42 is loosened to move the support 30 away from the face plate 10. By doing so, the gap between the ring-shaped member 50 and the face plate 10 is widened, so that the biting teeth 61 of the retaining member 60 come out of the inner peripheral portion of the resin tube end 110, and the retaining member 60 is reduced in diameter by its elasticity. I do. Therefore, the distance between the retaining member 60 and the tubular body 20 is increased, and the port closing device can be pulled out from the resin pipe end 110.

When the tube closing device is mounted, the flat inner surface of the tubular body 110 only contacts the outer surface of the resin tube end 110. Even after the device is removed, there is no pressing trace or biting trace remaining on the outer peripheral surface of the resin tube end 110 as an obstacle to connecting another resin tube. Therefore, it is possible to connect to another resin pipe end without cutting the resin pipe end after removing this device. The biting teeth 61 of the retaining member 60 are provided on the inner peripheral surface of the resin pipe end 110.
However, since they remain only on the inner peripheral surface of the resin tube end 110 and do not remain on the outer peripheral surface thereof, the engraving traces and the pressing The trace does not become an obstacle when connecting another resin tube. Also, even if the tooth height of the biting teeth 61 of the retaining member 60 is increased to improve the pressure resistance and airtightness of the biting portion, the biting marks remain on the inner peripheral surface of the resin pipe end 110. Therefore, there is no inconvenience when connecting the other resin tube ends.

In this embodiment, the cylindrical body 20 and the face plate 10
However, in this regard, the tubular body 20 and the face plate 10 may be provided as separate members. Also,
The tightening mechanism M1 is not limited to the illustrated example, and for example, a clamp mechanism may be used.

FIGS. 5 and 6 show a fastening mechanism M according to a modification.
1 shows a port closure device using No. 1. The tightening mechanism M1 includes a male screw 41 formed on the shaft body 40, a nut body 42 screwed into the male screw 41, and the nut body 42 interposed between the face plate 10 and the nut body 42 to connect the nut body 42 to the face plate 1.
And a spring body 80 that resiliently urges in a direction away from zero. Further, a coil spring is used as the spring body 80, and washers (flat washers in the illustrated example) 81 and 82 are interposed between the coil spring and the face plate 10 and the nut body 42.

When this tightening mechanism M1 is used, a certain tightening torque can be obtained by the elastic urging force of the spring body 80 only by screwing the nut body 42 close to the specified position of the male screw 41 of the shaft body 40. become. Therefore, when attaching the device to the resin pipe end 110, the nut 4
2. Tightening torque management (torque management) becomes easier. In addition, elements such as the face plate 10, the support 30, the ring-shaped member 50, the retaining member 60, and the sealing material 70 are temporarily held integrally, so that it is easy to handle as an integrated object. Furthermore, even if it is assumed that the face plate 10 and the like once expanded due to the internal pressure of the resin tube during the pressure test of the resin tube and then returned to the original shape,
The situation that the nut body 42 becomes loose does not occur. In particular, the torsional stress when the nut body 42 is screwed in by the action of the washers 81 and 82 is less likely to remain in the coil spring, and the nut body 42 is less likely to be loosened.

In the mouthpiece closing device shown in FIGS. 5 and 6, the structure and operation other than the tightening mechanism M1 are the same as those described with reference to FIGS. Or, corresponding parts are denoted by the same reference numerals, and detailed description is omitted.

[0045]

According to the pipe mouth closing device of the present invention, it is possible to immediately connect with another resin pipe end without cutting the resin pipe end after removing the apparatus, and the shape at the time of mounting can be obtained. However, unlike the conventional case, the size is not increased, and furthermore, since the tightening operation only needs to be performed at one place, the attachment and detachment can be performed quickly and easily. Further, the pressure resistance and the airtightness can be improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional side view showing a use state of a device for closing a mouth of a resin pipe according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an enlarged cross-sectional view showing a position of a retaining member before a tightening mechanism is tightened.

FIG. 4 is a partial vertical sectional side view of the device before being attached to an end of a resin pipe.

FIG. 5 is a partial longitudinal side view showing a use state of a mouthpiece closing device using a fastening mechanism according to a modification.

6 is a partial vertical sectional side view of the apparatus for closing the mouthpiece of FIG. 5 before being attached to an end of a resin pipe.

FIG. 7 is a partial vertical sectional side view showing a state of use of a conventional resin tube opening closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Face plate 11 Receiving part 20 Cylindrical body 21 Opening 30 Support body 34 Engaging part 36 Riding surface 40 Shaft 41 Male screw 42 Nut body 43 Fluid passage 45 Plug 50 Ring member 53 Working part 54 Pressing surface 60 Detachment member 61 False teeth 70 Sealing material 80 Spring body 81, 82 Washer 100 Resin tube 110 Resin tube end 120 Port M1 Tightening mechanism M2 Positioning mechanism

Claims (9)

[Claims] 1. A tubular body which is externally fitted to an end of a resin pipe so as to keep the end of the resin pipe in an initial shape, a face plate for closing a mouth of the resin pipe, and an inside of the end of the resin pipe. A retaining member disposed inside the end of the resin tube, the retaining member holding the end of the resin tube in cooperation with the cylindrical body and holding the end of the resin tube. And a positioning mechanism for positioning the support so as not to move in the axial direction of the support. 2. A ring-shaped member which is axially movably fitted to the support and is opposed to the face plate with the retaining member interposed therebetween, and the support and the face plate are fastened in a direction in which they approach each other. An engagement portion for locking and positioning the annular member externally fitted to the support is provided on the support, and the annular member is attached to the annular member by the engagement portion. An actuating portion for holding the retaining member in cooperation with a receiving portion provided on the face plate when the retaining member is locked to the support plate; and the positioning mechanism is provided on the tightening mechanism and the support. The said engagement part, the said ring-shaped member which has the said effect | action part, and the said face plate, It is formed.
A device for closing a mouth of a resin tube according to the above item. 3. The operating portion of the ring-shaped member to which one end of the retaining member is abutted, and the retaining member is formed of a tubular member having elasticity that can be expanded and reduced in diameter. Both the receiving portion of the face plate with which the other end of the member abuts are provided with an outwardly extending inclined surface, and when the annular member is moved closer to the face plate, the receiving portion and the action portion 3. The apparatus for closing a mouth of a resin pipe according to claim 2, wherein the retaining member sandwiched between the inclined surfaces expands in diameter against its elasticity. 4. The cylindrical body and the face plate are integrally formed, and the face plate has an opening through which a shaft body provided integrally with the support is inserted. 4. The mechanism according to claim 1, wherein the mechanism is formed by a male screw formed in the shaft body and a nut body screwed into the male screw to press the face plate and close the opening. The described device for closing a mouth of a resin tube. 5. The retaining member according to claim 1, wherein said retaining member has a biting tooth biting into an inner peripheral portion of an end portion of said resin tube.
The port closing device for a resin pipe according to claim 3. 6. An opening through which a shaft integrally provided with the support is inserted is formed in the face plate, and the shaft and the support communicate with an internal passage of a resin pipe. A fluid passage is formed, a plug for closing the fluid passage is detachable from the shaft, and a seal member for closing a gap between the end of the resin tube in which the tubular body is fitted and the support. The apparatus for closing a mouth of a resin pipe according to any one of claims 1, 2, 3, 4, and 5. 7. The support member is provided with a climbing surface inclined in a tapered shape, and the annular member is externally fitted to the support member when the annular member is moved closer to the face plate. 7. The apparatus for closing a mouth of a resin pipe according to claim 6, further comprising a pressing surface for enlarging the diameter by back-pressing the sealing material and sliding along the riding surface. 8. The tightening mechanism includes a male screw formed in the shaft, a nut body screwed into the male screw, and a nut body interposed between the face plate and the nut body, the nut body being separated from the face plate. And a spring body which resiliently urges in a direction in which the springs are separated from each other.
The port closing device for a resin pipe according to any one of claims 5, 6, and 7. 9. The apparatus according to claim 8, wherein the spring body is a coil spring, and a washer is interposed between the coil spring and the face plate and the nut body.