JP2002122277A - Coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupler capable of eliminating deficiency caused on a water stopping member such as projection of the water stopping member from a storage groove in accordance with insertion of a pipe into an insertion space, damage of the water stopping member, etc. SOLUTION: The storage groove 26 an inner bottom surface of which is inclined so as to increase the depth toward the outside is formed on an outer peripheral surface of an inside cylinder part 25. Thereafter, a pair of ring sealants 19a and the water stopping member 19 formed by connecting each of the sealants 19a to each other by a connecting member 19b is stored in the storage groove 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a resin pipe used in a piping system of a water supply system and a hot water supply system, for example.

[0002]

2. Description of the Related Art As a conventional joint of this type, the following is known. That is, the conventional joint mainly includes a main body having an insertion space that allows insertion of the end of the resin pipe, a split ring fitted into one end of the main body, and a nut screwed into one end of the main body. ing. An inner cylindrical portion protruding into the insertion space is protruded from the inside of the main body,
A receiving groove is formed in the outer peripheral surface of the distal end of the inner cylindrical portion.
Further, a sealing material as a water-stopping member formed in a ring shape from a rubber material is fitted in the accommodation groove.

When connecting a resin pipe to the above joint, first insert the end of the resin pipe into the insertion space, insert the inner cylinder into the resin pipe, and then tighten the nut screwed to the main body. Tighten further. When the nut is tightened, the split ring is pushed inward into the joint. The outer peripheral surface of the split ring is engaged with the inner peripheral surface of the main body, and the split ring is reduced in diameter. The part is retained in the insertion space. At the same time, the sealing material comes into close contact with the inner peripheral surface of the pipe, and water is stopped between the outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the pipe.

[0004]

However, in the above-mentioned conventional joint, the end of the resin pipe is cut obliquely, and when the cut side is inserted into the insertion space, the cut surface becomes oblique. Of these, the protruding portion first contacts the sealing material. Further, the sealing material is pressed by the inner peripheral surface of the protruding portion, and the sealing material is sandwiched between the inner peripheral surface of the resin pipe and the accommodation groove. At this time, on the end face of the resin pipe, a portion substantially opposite to the protruding portion has not reached the sealing material, and the sealing material is not suppressed on the inner peripheral surface of the pipe. Therefore, the pressing force of the projecting portion of the resin pipe against the sealing material is transmitted to the portion not pressed by the resin pipe, and the sealing material projects from the housing groove.

[0005] When the resin pipe is further inserted into the insertion space in a state where the sealing material protrudes from the housing groove, the end face of the resin pipe reaches the sealing material protruding from the housing groove,
The sealing material is pushed out to the back of the main body. At this time, since the sealing material located on the opposite side of the portion protruding from the accommodation groove is sandwiched between the inner peripheral surface of the resin pipe and the accommodation groove, the sealing material cannot move in the accommodation groove, and the sealing material pushed to the back is There is a problem that the resin pipe may be cut or damaged by insertion.

The present invention has been made by focusing on the problems existing in the prior art as described above. It is an object of the present invention to provide a joint that can eliminate problems caused by a water-stopping member such as protrusion of a water-stopping member from an accommodation groove due to insertion of a pipe into an insertion space and damage to the water-stopping member. It is in.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises a main body having a cylindrical shape and having an insertion space inside which allows an end of a pipe to be inserted,
An inner cylindrical portion that is protruded inside the main body and is internally fitted into a pipe inserted into the insertion space, a nut screwed to one end of the main body, and a space between the main body and the nut. A fitting provided with a retaining member for preventing an end of the pipe from being inserted into the insertion space, wherein a receiving groove is formed in the outer peripheral surface of the inner cylindrical portion, and the receiving groove is inserted into the receiving space. A water-stopping member made of an elastic material that presses against the inner peripheral surface of the pipe is accommodated, and the water-stopping member is formed by connecting at least two ring-shaped seal materials to form the water-stopping member. It is characterized in that the water stop member is prevented from protruding from the accommodation groove when the pipe is inserted.

According to a second aspect of the present invention, in the joint according to the first aspect, the water-stopping member is formed by connecting at least two seal members by connecting members obliquely intersecting the respective seal members. They are connected to form an oblique lattice.

According to a third aspect of the present invention, in the joint according to the first or second aspect, a lubricating auxiliary agent is accommodated from a gap formed between the seal members. According to a fourth aspect of the present invention, in the joint according to any one of the first to third aspects, the housing groove is recessed such that the depth increases toward the distal end side of the inner cylindrical portion. Things.

According to a fifth aspect of the present invention, in the joint according to any one of the first to fourth aspects, the retaining member is formed in a ring shape and projects inward from an inner periphery thereof. Formed by a lock ring with a regulating piece of
The pipe is inserted into the insertion space of the main body through the nut screwed into one end of the main body, and the pipe is prevented from falling out of the insertion space by engaging the restriction piece of the lock ring with the outer surface of the pipe. It was done.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention is described by using an end of a pipe constituting a water supply pipe and a polyolefin (crosslinked polyethylene,
An embodiment embodied in a joint for connecting an end of a resin pipe formed of a synthetic resin material such as polybutene will be described in detail with reference to the drawings. In addition, up, down, left and right in the following description correspond to up, down, left and right in FIG.

As shown in FIG. 1, the joint 11 has a pipe connecting portion 12 at the left end to which an end of the pipe (not shown) is connected, and a resin pipe 10 (see FIGS. 3 to 5). ) Has a pipe connection portion 13 to the right end. The resin pipe 10 is connected to the joint 11 by inserting an end thereof into the joint 11 from the pipe connection portion 13, and the pipe body (not shown) is connected to the joint 11 by fitting the end portion to the pipe connection portion 12. It has become. As shown in FIGS. 1 and 3, the joint 11 includes a cylindrical main body 14, a nut 15, a split ring 16, a washer 17, a water blocking member 19, an O-ring 18, a collar 20, which are assembled to the main body 14. And a shaft 21. The main body 14, the nut 15, the split ring 16 and the washer 17 are made of brass, the O-ring 18 and the water blocking member 19 are made of an ethylene-propylene-diene copolymer as an elastic material, and the collar 20 and the shaft 21 are made of polyacetal. ing.

The main body 14 is provided with two thread
2,23. The nut 15 is screwed to the right end of the main body 14, and the tube (not shown) is screwed to the left end of the main body 14. Further, as shown in FIG. 1, the inner peripheral surface at the right end of the main body 14 is a tapered surface 24 that approaches the outer peripheral surface of the main body 14 toward the right side. Further, inside the main body 14, a cylindrical inner cylinder portion 2 is provided.
5 are protrudingly provided. The inner cylindrical portion 25 extends rightward from an inner peripheral surface of an intermediate portion of the main body 14 in the axial direction.

An accommodation groove 26 for accommodating the water-stopping member 19 is provided at the right end of the inner cylindrical portion 25. This accommodation groove 2
6 is formed over the entire circumference in the circumferential direction of the inner cylindrical portion 25. The accommodation groove 26 is formed by inclining the inner bottom surface so that the depth increases toward the front end side (right side). There is an annular gap between the inner cylindrical portion 25 and the main body 14, and this gap is an insertion space 27 that allows the insertion of the resin pipe 10 inserted into the joint 11 from the pipe connection portion 13.

The water-stopping member 19 made of an elastic material and housed in the housing groove 26 will be described. As shown in the development views of the water-stopping member 19 in FIGS. 1 and 2, the water-stopping member 19 has two ring-shaped sealing members 19a having the same inner diameter, and a connecting member having the same diameter as each sealing member 19a. The sealing members 19a are connected to each other so as to be parallel to each other by 19b. The length in the width direction of the water blocking member 19 is set to 8 mm.

The water-stopping member 19 will be described in detail. When the water-stopping member 19 is in an unfolded state, a plurality of linear connecting members 19b obliquely intersect a pair of sealing members 19a, respectively. The connecting members 19b are connected so as to be parallel and perpendicular to each other at a certain interval, and the connecting members 19b are perpendicular to each other. As a result, the connection members 19b are arranged so as to cross each other between the pair of seal members 19a to form an oblique lattice, and a gap 19c is formed between the pair of seal members 19a and the connection member 19b. I have.

In a state where the water stopping member 19 having the above configuration is fitted in the housing groove 26, the outer peripheral surface of the water stopping member 19
Regardless of the position in the accommodation groove 26,
Slightly protruding from The amount of protrusion increases from the right side to the left side of the inner cylindrical portion 25, that is, from the distal end side of the inner cylindrical portion 25 toward the insertion space 27. Further, although the pair of seal members 19a have the same inner diameter, the left-side seal member 19a has a larger diameter than the right-side seal member 19a. The force is increasing.

The water-stopping member 19 is pressed against the inner peripheral surface of the resin pipe 10 externally fitted to the inner cylindrical portion 25, whereby the space between the resin pipe 10 and the inner cylindrical portion 25 is sealed. ing. Grease as a lubricating aid is stored in the gap 19c, and grease is applied to the outer surface of the water stopping member 19 by passing the resin pipe 10 over the water stopping member 19.

As shown in FIGS. 1 and 3, the nut 1
5 has an annular locking portion 29 having a screw thread 28 on the inner peripheral surface and extending radially inward from the right end.
have. The split ring 16 is fitted into the right end of the main body 14. The split ring 16 is formed in a substantially C-shape, and has a configuration in which the diameter can be reduced when a force is applied from the outside toward the radial inside. Further, the outer peripheral surface of the split ring 16 is closer to the inner peripheral surface of the split ring 16 toward the left side, and the tapered surface 1 coincides with the inner peripheral surface at the left end.
6a. The washer 17 is formed in a ring shape, and is interposed between the split ring 16 and the locking portion 29 of the nut 15.

The O-ring 18 is disposed inside the insertion space 27. The inner wall of the insertion space 27 and the end of the resin pipe 10 inserted into the insertion space 27 are in close contact with each other to seal between them.

The collar 20 is fitted in a through hole 30 formed in a radial direction at an intermediate portion of the main body 14.
The through hole 30 is formed so as to communicate with the insertion space 27 at a position corresponding to the inner part of the insertion space 27.
On the other hand, the shaft 21 is formed in a substantially columnar shape. The lower end of the shaft 21 has a conical shape whose diameter decreases toward the bottom, and a tapered surface 31 as an inclined surface is formed at the lower end. The shaft 21 is disposed in the through hole 30 in a state of being fitted into the collar 20, and is configured to be able to move up and down in the through hole 30.

Next, the operation of the joint 11 configured as described above will be described. When connecting the resin pipe 10 whose end face is cut obliquely to the pipe connection portion 13 of the joint 11, first, as shown in FIG. The resin pipe 10 is pushed outward toward the inside of the insertion space 27 of the joint 11 in this state. When the resin pipe 10 is pushed inward, the resin pipe 1
0, the inner peripheral surface of the protruding side and the accommodation groove 26
A part of the water stopping member 19 is sandwiched between
Is pressed toward the accommodation groove 26 side.

At this time, since the water stopping member 19 is constituted by the pair of sealing members 19a and the plurality of connecting members 19b, the water stopping member 19 is compared with the case where the water stopping member 19 is constituted by one sealing member 19a. The tightening force on the inner bottom surface of the housing groove 26 is increased. The tightening force of the left seal member 19a of the pair of seal members 19a is larger than that of the right seal member 19a. Further, the pressing force of the water stopping member 19 by the inner peripheral surface of the resin pipe 10 is reduced by the sealing material 1.
9a and the connecting member 19b. In addition, since the connecting member 19b obliquely intersects the pair of sealing members 19a, the axial direction of the connecting member 19b is smaller than when the connecting member 19b is orthogonal to the pair of sealing members 19a. The length to is longer.

Therefore, the water blocking member 19 is made of one sealing material 1.
9a, the resistance of the inner peripheral surface of the resin pipe 10 against the pressing of the water-stopping member 19 is increased, and the force transmitted to the portion substantially opposite to the pressed portion is transmitted. The pressing force decreases. as a result,
As compared with the case where the water-stopping member 19 is formed by a single sealing material 19a, the water-stopping member 19 located substantially opposite to the portion pressed by the inner peripheral surface of the resin pipe 10 projects from the housing groove 26. Is regulated.

Further, when the resin pipe 10 is externally fitted to the inner cylindrical portion 25 while being twisted, the connecting member 19b of the water stopping member 19 extends obliquely substantially along the twisting direction. The resin pipe 1 of the water stopping member 19 is compared with a case where the resin pipe 1 is orthogonal to the pair of sealing members 19a.
0 The resistance to the inner peripheral surface is reduced.

The accommodation groove 26 is deeper toward the right side of the inner cylinder 25, and the water blocking member 19 from the accommodation groove 26 is moved toward the right end of the inner cylinder 25, that is, toward the side where the resin pipe 10 is inserted. Has a reduced height. Therefore, the contact area between the end face of the resin pipe 10 and the end face of the water blocking member 19 is reduced, and the resistance when the end face of the resin pipe 10 gets over the water blocking member 19 is reduced. In addition, since grease is applied to the gap 19c of the water stopping member 19 and the outer surface of the water stopping member 19, the friction between the inner peripheral surface of the resin pipe 10 and the outer surface of the water stopping member 19 is reduced, and the inner periphery of the resin pipe 10 is reduced. The passage of the surface over the water stop member 19 is performed smoothly.

[0027] As shown in FIG.
When the resin pipe 10 is pushed inward, the end of the resin pipe 10 hits the tapered surface 31 at the lower end of the shaft 21, and the shaft 21 gradually moves upward as the resin pipe 10 is pushed. When the resin pipe 10 is pushed in until the end comes into contact with the O-ring 18, the amount of protrusion of the upper end of the shaft 21 becomes maximum.

The resin pipe 10 is connected to the joint 1 as described above.
1 and confirms that the upper end of the shaft 21 protrudes outward, and then tightens the nut 15 to complete the connection of the resin pipe 10. When the nut 15 is tightened, the washer 17 is
The split ring 16 is pushed to the left through the tapered surface 16, and the tapered surface 16 a of the split ring 16 engages with the tapered surface 24 of the main body 14 to reduce the diameter of the split ring 16. Thereby, split ring 1
6 is pressed against and engaged with the outer peripheral surface of the resin pipe 10 to prevent the resin pipe 10 from being inadvertently dropped. At the same time, the end of the resin pipe 10 is further pressed into the inside of the joint 11 while being pinched by the split ring 16, so that the end of the resin pipe 10 is pressed against the O-ring 18 to exhibit the sealing property. .

According to the above-described embodiment, the following effects can be obtained. -Because the water blocking member 19 is formed by connecting the pair of sealing members 19a and the connecting member 19b,
The tightening force of the water stopping member 19 on the housing groove 26, that is, the resistance force against the pressing of the resin pipe 10 can be increased as compared with the case where the water stopping member 19 is formed of one sealing material 19a. . Therefore, when the resin pipe 10 having an inclined end surface is inserted into the insertion space 27, the resin pipe 10
The water stop member 19, which is located on the substantially opposite side of the pressed portion, is restricted from protruding from the housing groove 26, and the end face of the resin pipe 10 comes into contact with the projecting portion of the water stop member 19. Can be prevented from being damaged or cut.

[0030] While twisting the resin pipe 10, the inner cylinder 2
5, the connecting member 19b extends obliquely along the twisting direction of the resin pipe 10, so that the connecting member 19b is connected as compared with the case where the connecting member 19b is orthogonal to the pair of seal members 19a. The torsional stress acting on the member 19b can be reduced. Therefore, it is possible to eliminate the troubles caused when the water blocking member 19 is damaged or cut.

The connecting member 19 b is made of a pair of sealing materials 19
It crosses obliquely with respect to a. Therefore, the connecting member 1
The length in the axial direction is longer than that in the case where 9b is orthogonal to the pair of seal members 19a, and the resistance to pressing of the resin pipe 10 can be increased. Therefore, the resistance against the pressing force is increased as compared with the case where the water stopping member 19 is formed by one sealing material 19a, and the stop located on the side opposite to the portion pressed by the inner peripheral surface of the resin pipe 10 is provided. The protrusion of the water member 19 from the accommodation groove 26 can be further restricted.

Grease is stored in the gap 19c of the water stopping member 19, and grease is applied to the outer surface of the water stopping member 19, so that the water stopping member 19 on the inner peripheral surface of the resin pipe 10 is provided.
The resin pipe 10 to the joint 11
Can be quickly performed.

Since the accommodation groove 26 is deeper toward the right side of the inner cylindrical portion 25, unlike the case where the accommodation groove 26 is formed at the same depth, the accommodation groove 26 moves toward the right end of the accommodation groove 26. The projecting height of the water stop member 19 from the outside is reduced. Therefore, the contact area between the cut surface of the resin pipe 10 and the water-stopping member 19 is reduced, and the pressing force of the water-stopping member 19 by the resin pipe 10 is reduced to reduce the water-stopping member 1 on the opposite side.
9 can be reduced.

Similarly, the end face of the resin pipe 10 can smoothly pass over the water blocking member 19, and the insertion space 2
The work of inserting the resin pipe 10 into the inside 7 can be performed quickly.

The above embodiment can be modified as follows. In the embodiment, the split ring 16 is used as a retaining member, but the joint 1 shown in FIG.
1 and a lock ring 33 may be used as a retaining member instead of the split ring 16.

Referring to the joint 11 shown in FIG.
The tapered surface 24 on the inner peripheral surface at the right end of the main body 14 is omitted, and an annular portion of the lock ring 33 is formed at the right end of the main body 14 so as to be engageable. The accommodation groove 26 is formed in three steps with different diameters of the inner bottom surface so that the depth increases toward the right side.
A concave groove capable of accommodating the sealing material 19a is formed between the inner groove 6 and the inner bottom surface. The water blocking member 19 is formed by joining three seal members 19a having the same inner diameter so that the annular portions are parallel to each other, and each seal member 19a is fitted into each concave groove of the accommodation groove 26. I have. As shown by the broken line in FIG. 6, the lock ring 33 has a ring shape made of stainless steel and projects inward at the same length on the inner peripheral portion thereof and can be engaged with the outer peripheral surface of the resin pipe 10. Is formed.

The two lock rings 33 are attached to the main body 1 with an annular spacer 34 interposed therebetween.
4 is disposed on the right end face. When the nut 15 is screwed into the main body 14, the lock ring 33 is positioned and fixed in the joint 11 with the spacer 34 interposed between the main body 14 and the nut 15.

When the joint 11 is used, the insertion space 2 of the main body 14 is inserted through the nut 15 from the nut 15 side.
7. Push the resin pipe 10 deep inside. Then, on the cut surface of the resin pipe 10, a part of the water stopping member 19 is sandwiched between the inner peripheral surface on the protruding side and the housing groove 26, and the water stopping member 19 is pressed toward the housing groove 26.

At this time, since the water-stopping member 19 is constituted by three sealing members 19a, the tightening of the water-stopping member 19 with respect to the accommodation groove 26 is compared with the case where the water-stopping member 19 is constituted by one sealing member 19a. The force is increasing. Further, when the sealing material 19a is pulled backward by the end face of the resin pipe 10, each sealing material 19a comes into contact with the wall surface of the concave groove, so that a resistance force against the tension acts and the left sealing material 19a is moved to the right. A pulling force acts.

Therefore, the water stopping member 19 is made of one sealing material 1.
9a, the resistance to the force of turning up the water blocking member 19 generated by the pressing of the water blocking member 19 by the inner peripheral surface of the resin pipe 10 is increased, and the pressed portion is The pressing force transmitted to the portion located on the substantially opposite side is reduced. As a result, as compared with the case where the water-stopping member 19 is formed by a single sealing material 19a, the water-stopping member 19 located substantially opposite to the portion pressed by the inner peripheral surface of the resin pipe 10 has the accommodation groove 26. Is restricted.

Further, the regulating pieces 33a of the pair of lock rings 33 are engaged with the outer surface of the resin pipe 10. As a result, the resin pipe 10 is prevented from falling out of the insertion space 27. Further, after the nut 15 is screwed into the main body 14, the resin pipe 10 is connected to the joint 11 simply by inserting the resin pipe 10, so that the operation of tightening the nut 15 can be omitted, and the joint 11 of the resin pipe 10 can be omitted. Can be performed quickly.

The housing groove 26 may not be formed in a step shape, but may be formed so as to be inclined obliquely, and the water stopping member 19 used in the embodiment may be used. Further, the concave groove located on the left side may be formed in a linear shape in the side section, and the other concave grooves may be formed in an arc shape in the side section so that the side sectional shape corresponds to the outer surface shape of the sealing material 19a.

In the embodiment, the housing groove 26 is
Although the inner bottom surface is formed so as to be inclined so that the depth becomes deeper toward the right side, the accommodation groove 26 may be formed at the same depth without being inclined. When the accommodation groove 26 is formed at the same depth, the outer diameter of the sealing member 19 a is reduced toward the right side of the inner cylindrical portion 25, and the accommodation groove 2 of the water blocking member 19 is formed.
6 may be reduced. Also in the case of such a configuration, the contact area between the end face of the resin pipe 10 and the water blocking member 19 can be reduced, and the operation of inserting the resin pipe 10 into the insertion space 27 can be performed smoothly.

In the embodiment, the gap 19 between the water blocking members 19
Although grease is applied to c and the outer surface of the water blocking member 19, grease may not be applied. Further, instead of grease, wax or the like may be applied to the outer surface of the water blocking member 19 as a lubricating aid.

In the embodiment, the water blocking member 19 is formed such that the connecting member 19b crosses the pair of sealing members 19a obliquely. However, as shown in FIG. The seal members 19a may be connected to each other by the connection members 19b such that the connection members 19b are orthogonal to each other.
The seal members 19a are connected to each other so that the connecting members 19b are orthogonal to the pair of seal members 19a.
You may connect by b.

In the embodiment, the joint 11 connecting the end of the pipe constituting the water supply pipe and the end of the resin pipe 10 is embodied. However, the drain pipe, the oil supply pipe, the header and the resin pipe 10 or copper or the like is used. The joint 11 may be used when connecting the end of the pipe made of a soft metal material.

Further, the technical ideas that can be grasped from the above embodiment will be described below. (1) A main body having a cylindrical shape and having an insertion space therein for permitting insertion of an end of the pipe, and a pipe protruding from the main body and being fitted inside the pipe inserted into the insertion space. An inner cylinder portion, a nut screwed to one end of the main body, and a retaining member disposed between the main body and the nut to prevent an end of the pipe from falling into the insertion space. A water stopping member made of an elastic material, which is housed in a housing groove recessed in the outer peripheral surface of the inner cylindrical portion and pressed against the inner peripheral surface of the pipe inserted into the insertion space, wherein at least two ring-shaped members are provided. A water stopping member formed by connecting a sealing material, and being capable of restricting projection from the accommodation groove when the pipe is inserted into the insertion space. With this configuration, it is possible to eliminate problems caused by the water stopping member, such as protrusion of the water stopping member from the accommodation groove and damage to the water stopping member due to insertion of the pipe into the insertion space.

(2) The water stoppage according to (1), wherein the at least two sealing members are connected to each of the sealing members by connecting members crossing obliquely and formed in an oblique lattice shape. Element. In the case of such a configuration, the waterproofing member located on the opposite side to the portion pressed by the pipe inner peripheral surface by increasing the resistance force against the pressing by the inner peripheral surface of the pipe to the waterproof member protrudes from the accommodation groove. Can be more regulated.

(3) The joint according to any one of claims 1 to 5, wherein the water blocking member projects from the accommodation groove at any position in the accommodation groove. With such a configuration, it is possible to reliably exhibit the sealing property between the inner peripheral surface of the pipe and the outer peripheral surface of the inner cylindrical portion.

[0050]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, it is possible to eliminate problems caused by the water stopping member such as protrusion of the water stopping member from the accommodation groove and damage to the water stopping member due to insertion of the pipe into the insertion space. .

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in the above, the waterproofing member located on the opposite side to the portion pressed by the pipe inner peripheral surface by increasing the resistance force against the pressing by the inner peripheral surface of the pipe to the waterproof member protrudes from the accommodation groove. Can be more regulated.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effects of the invention described in claim 2, the pipe can be quickly inserted into the insertion space. According to the invention described in claim 4, in addition to the effect of the invention described in any one of claims 1 to 3, the contact area between the end face of the pipe and the water stopping member is reduced, and the pipe is stopped. By reducing the pressing force of the water member, the amount of protrusion of the water stopping member can be reduced.

According to the invention described in claim 5, claim 1 is provided.
In addition to the effects of the invention according to any one of claims 4 to 4,
Connection work between a pipe and a joint can be performed quickly and easily.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a joint according to an embodiment.

FIG. 2 is an exploded view showing the water stopping member of the embodiment.

FIG. 3 is an exploded perspective view showing a joint.

FIG. 4 is an essential part cross-sectional view showing a state where a resin pipe is inserted into a joint.

FIG. 5 is a half sectional view showing a state where a resin pipe is inserted into a joint.

FIG. 6 is a half sectional view showing another example of a joint.

FIG. 7 is a development view showing another example of the water stopping member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Resin pipe, 11 ... Coupling, 14 ... Main body, 15 ... Nut, 16 ... Split ring as a retaining member, 19 ... Water stop member, 19a ... Seal material, 19b ... Connection member, 19c
... Gap, 25 ... Inner cylinder part, 26 ... Accommodation groove, 27 ... Insertion space, 33 ... Lock ring as retaining member, 33a
... Regulatory pieces.

Claims (5)

[Claims] 1. A main body having a cylindrical shape and having an insertion space therein for allowing an end of a pipe to be inserted therein, and a pipe protruding into the main body and inserted into the insertion space. An inner tubular portion to be fitted, a nut screwed to one end of the main body, and a retaining member disposed between the main body and the nut to prevent an end of the pipe from falling into the insertion space. In the joint, a housing groove is recessed on the outer peripheral surface of the inner cylindrical portion, and a water stopping member made of an elastic material that presses against the inner peripheral surface of the pipe inserted into the insertion space is housed in the housing groove. The water-stopping member is formed by connecting at least two ring-shaped sealing members to restrict the water-stopping member from projecting from the accommodation groove when the pipe is inserted into the insertion space. A joint characterized by the above-mentioned. 2. The joint according to claim 1, wherein the water-stopping member is formed in an oblique lattice shape by connecting at least two seal members by a connecting member that crosses the seal members obliquely. . 3. The joint according to claim 1, wherein a lubricating auxiliary agent is accommodated from a gap formed between the sealing members. 4. The joint according to claim 1, wherein the housing groove is recessed so as to be deeper toward the distal end of the inner cylindrical portion. 5. The locking member is formed by a lock ring having a ring shape and a plurality of restricting pieces protruding inward from an inner periphery thereof, and formed through a nut screwed to one end of the main body. The pipe is inserted into the insertion space of the main body by means of a lever, and the pipe is prevented from falling out of the insertion space by engagement of the restricting piece of the lock ring with the outer surface of the pipe. The joint described in the above.