JP2000346263A - Joint for corrugated pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a corrugated pipe from falling off when a retainer breaks away from a joint body. SOLUTION: This joint is equipped with a joint body 2 having a connecting hole 10, a clamping member 4 having a through hole 42, and a retainer 6 engaging with a corrugated pipe 18. The retainer 6 has a base part, a plurality of engaging hook portions 34 provided on one end of the base part and engaged with a valley portion 18b of the corrugated pipe 18, and a engaging projecting portion 38 provided on the other end of the base part. The joint body 2 has a fitting inner surface 22 into which the engaging hook portions 34 are fitted, and a positioning protrusion 26 engaged with the engaging projection portion 38 of the retainer 6. The clamping member 4 has a pressing portion 46 acting on the base part of the retainer 6, and deformation preventing portion 45 for preventing the deformation of the engaging projection portion 38 of the retainer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a corrugated pipe joint for connecting a corrugated pipe.

[0002]

2. Description of the Related Art Corrugated pipes are widely used for passing gas, tap water and the like, and various types of joints for corrugated pipes have been proposed and put to practical use for connecting the corrugated pipes. Examples of the joint for corrugated pipe include those disclosed in, for example, Japanese Patent No. 2686237 and Japanese Patent No. 2726380. Such a known joint includes a joint body, a fastening member screwed to the joint body, and a retainer rotatably engaged with the fastening member.
A connection hole is formed in the joint body, a through hole is formed in the fastening member, and one end of the corrugated pipe to be connected is inserted into the connection hole of the joint body through the through hole in the fastening member. Further, the retainer has a plurality of engaging projections, and these engaging projections increase in diameter to climb over the peak of the corrugated pipe, and reduce in diameter to engage with the valley of the corrugated pipe.

In this known corrugated pipe joint, the corrugated pipe can be connected by inserting the corrugated pipe through the through hole of the tightening member and then tightening the tightening member. That is, when the tip of the corrugated pipe is inserted through the through-hole of the fastening member, the plurality of engaging projections of the retainer engage with the valleys that follow about one peak of the tip of the corrugated pipe. When the tightening member is tightened in such a state, the retainer moves toward the shoulder of the joint body due to the action of the tightening member, and the shoulder and the retainer of the joint body cause the corrugated pipe projecting from the retainer to move. One peak is crushed, and thus one end of the corrugated pipe is connected as required.

[0004]

In such a joint,
In order to crush about one mountain at the end of the corrugated pipe, it is important to maintain the joint body and the fastening member in a predetermined positional relationship. More specifically, the tip of the corrugated pipe inserted through the through hole of the fastening member abuts the shoulder of the joint body, and the abutment of the shoulder prevents the insertion. Therefore, by setting the distance from the shoulder of the joint body to the engaging projection of the retainer to be approximately one peak of the corrugated pipe, it is ensured that about one peak of the distal end of the corrugated pipe is projected from the engaging projection of the retainer. This makes it possible to crush and connect about one peak of the distal end of the corrugated pipe.

In order to set the distance between the shoulder of the joint body and the engaging projection of the retainer in this way, for example, it is necessary to provide a spacer between the fastening member with which the retainer engages and the joint body, In connection with this, there is a problem that the configuration of the entire joint becomes complicated and the number of components thereof increases.

In order to solve such a problem, the present applicant has proposed a new type of joint for a corrugated pipe (Japanese Patent Application No. 10-226661). The proposed joint for a corrugated pipe includes a joint body having a connection hole, a fastening member having a through hole, and a retainer having a plurality of engaging claws capable of increasing and decreasing the diameter. Are detachably disposed in the connection holes of the above. In this corrugated pipe joint, a positioning protrusion is provided on the joint body, and an engaging protrusion is provided on the retainer, and the retainer is positioned at a predetermined position with respect to the joint body by the engaging of the positioning protrusion and the engaging protrusion. , And a conventionally required spacer can be omitted.

However, this joint for corrugated pipes has the following new problem. That is, when the tightening member is tightened after inserting the corrugated pipe through the through hole of the tightening member, the tightening member acts to separate the retainer from the positioning projection of the joint body. The mating projection is deformed in the direction opposite to the insertion direction. When such deformation occurs, the diameter of the plurality of engaging claws is slightly increased due to the deformation, and when the deformation is increased, the diameter expansion amount is increased. Therefore, when a large force acts on the corrugated pipe in the pulling-out direction when the engaging projection is greatly deformed,
The engagement between the plurality of engaging claws of the retainer and the valleys of the corrugated pipe may be released, and the corrugated pipe may come off.

An object of the present invention is to provide a joint for a corrugated pipe which can reliably prevent the corrugated pipe from coming off when the retainer is detached from the joint body.

It is another object of the present invention to provide a joint for a corrugated pipe which can surely reduce the diameter of the engaging claw of the retainer whose diameter has been increased by inserting the corrugated pipe.

[0010]

SUMMARY OF THE INVENTION The present invention provides a joint body having a connection hole extending in an axial direction, a fastening member having a through hole extending in an axial direction, and inserted through the through hole of the fastening member. A joint for corrugated pipes, comprising a retainer engaged with a corrugated pipe, wherein the joint body and the fastening member are screwed to each other, wherein the retainer has an annular base portion and one end of the base portion. A plurality of engaging claw portions provided at intervals in the circumferential direction, and an engaging protrusion provided at the other end of the base portion, wherein the plurality of engaging claw portions are expanded in diameter. The joint body is provided with a shoulder facing the tightening member and provided adjacent to the shoulder, and the plurality of engagement claws of the retainer fit into the joint body. An inner surface, and a positioning projection that engages with the engagement projection of the retainer. The fastening member has a pressing portion acting on the base portion or the plurality of engaging claws of the retainer, and a deformation preventing portion for preventing deformation of the engaging protrusion of the retainer. When the corrugated pipe is inserted through the through hole of the tightening member, the plurality of engaging claws of the retainer are enlarged in diameter and climb over the corrugated pipe, and are reduced in diameter to reduce the diameter of the corrugated pipe. When engaging with the valley of the corrugated pipe and tightening the tightening member, the pressing portion of the tightening member acts on the base portion or the plurality of engaging claws of the retainer, whereby the retainer Moves relative to the joint body in the axial direction, whereby the engagement protrusion of the retainer is disengaged from the positioning protrusion of the joint body, and the retainer is attached to the fitting inner surface of the joint body. To be inserted The features.

According to the present invention, since the joint body has the positioning projection and the retainer has the engaging projection, the retainer is engaged with the positioning projection so that the retainer is moved to the joint body. Is held at a predetermined position. In such a state, when the corrugated pipe is inserted through the through hole of the tightening member, the plurality of engaging claws of the retainer expands in diameter and pass through the corrugated pipe peaks, and these engaging claws are contracted. Engage with the valley of the corrugated pipe by diameter. When the tightening member is tightened in such a state, the pressing portion of the tightening member acts on the base portion or the plurality of engaging claws of the retainer, whereby the retainer relatively moves with respect to the joint body, and The collision portion is separated from the positioning projection of the joint body. At this time, the engaging protrusion of the retainer tends to deform in the direction opposite to the moving direction, but since the deformation preventing portion is provided on the tightening member, the deformation of the engaging protrusion at the time of disengagement described above is reduced. The deformation preventing portion surely prevents the corrugated pipe from coming off, since the plurality of engaging claws at this time are prevented from increasing in diameter. When the tightening member is further tightened, the retainer is fitted into the fitting inner surface of the joint body, and thus the corrugated pipe is connected to the joint body with its ridge crushed.

In the present invention, the joint body is provided with an annular elastic member corresponding to the plurality of engaging claws of the retainer. The diameter of the plurality of engaging claws is reduced by elastically restoring the diameter of the engaging claws.

According to the present invention, since the joint body is provided with the annular elastic member, when the corrugated pipe is inserted through the through hole of the fastening member, the annular elastic member is elastically deformed, so that a plurality of retainers are provided. The engaging claw crosses over the peak of the corrugated pipe, and the annular elastic member elastically recovers, so that the engaging claw engages with the valley of the corrugated pipe and engages using the elastic recovery of the annular elastic member. The claw portion can be reduced in diameter so as to be reliably engaged with the crest portion.

Further, in the present invention, an annular elastic member is mounted on an outer peripheral surface of the plurality of engaging claws of the retainer,
The annular elastic member is elastically deformed to allow the plurality of engaging claws to increase in diameter, and is elastically restored to reduce the diameter of the plurality of engaging claws.

According to the present invention, since the annular elastic member is mounted on the outer peripheral surface of the plurality of engaging claws of the retainer, when the corrugated pipe is inserted through the through hole of the tightening member, the annular elastic member becomes The plurality of engaging claws of the retainer climb over the corrugated tube by elastic deformation, and the engaging claw engages with the corrugated tube valley by the elastic restoration of the annular elastic member. Similarly to the above, the diameter of the engaging claw portion can be reduced so that the engaging claw portion can be securely engaged with the above-mentioned crest portion.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a joint for a corrugated pipe according to the present invention. FIG. 1 is a cross-sectional view showing an upper half of an embodiment of a corrugated pipe according to the present invention, and FIG. 2 is a half cross-sectional view showing a cross section of an upper half of a retainer of the joint for a corrugated pipe of FIG. FIG. 4 is a cross-sectional view showing a state in which an engaging claw portion of a retainer gets over a corrugated portion of a corrugated pipe in the corrugated pipe joint of FIG. 1, and FIG. 4 is a cross-sectional view of the corrugated pipe of FIG. FIG. 5 is a cross-sectional view showing a state, and FIG. 5 is a cross-sectional view showing a state in which a corrugated pipe is connected in the corrugated pipe joint of FIG. 1.

Referring to FIG. 1, the illustrated corrugated pipe joint comprises a joint body 2, a tightening member 4 screwed to the joint body 2, and a retainer 6 attached to the joint body 2. I have. A through-hole 8 extending in the axial direction (left-right direction in FIG. 1) is formed at one end side (left end side in FIG. 1) of the joint main body 2, and the axial line is formed at the other end side (right end side in FIG. 1). A connection hole 10 extending in the direction is formed, and the through hole 8 and the connection hole 10 communicate with each other. In the joint body 2, an annular shoulder portion 12 is provided at the back of the connection hole 10, and the shoulder portion 12 is provided on the fastening member 4 side, that is, toward the right side in FIG. This shoulder 1
2 is provided with an accommodating recess 14.
A ring-shaped heat-resistant gasket 16 is mounted on the corrugated pipe 18 as described later.
Between the end of the joint and the joint body 2. An annular projection 20 extending in the axial direction toward the tightening member 4 is integrally provided on the inner peripheral portion of the shoulder portion 12, and the annular projection 20 is provided at one end of the corrugated pipe 18 to be inserted. It acts on the inner peripheral surface of the part to keep it concentric.

A fitting inner surface 22 is provided in the connection hole 10 of the joint body 2 adjacent to the shoulder portion 12. The inner diameter of the fitting inner surface 22 is gradually reduced in a tapered shape in the direction of insertion of the corrugated pipe 18 indicated by the arrow 23.
An annular concave portion 24 is provided adjacent to the right side of the fitting inner surface 22. Further, an annular positioning projection 26 is provided adjacent to the right side of the annular concave portion 24. The positioning projection 26 projects inward in the radial direction, and although not shown, the tip of the annular recess 24 is formed on the inner surface (left surface in FIG. 1) of the retainer in order to facilitate the expansion of the engagement claw portion of the retainer described later. , A tapered surface extending radially outward can be formed. A female screw portion 28 is provided adjacent to the right side of the annular protrusion 26, and the female screw portion 28 is
To the other end. The outer peripheral portion 29 at the intermediate portion of the joint body 2 is formed in a hexagonal shape, and a male screw portion 30 is provided on the outer peripheral surface at one end. Such a joint body 2 is formed of a metal material such as brass, for example.

In this embodiment, an annular mounting recess 31 is provided at an axially intermediate portion of the annular recess 24 of the joint main body 2, and an elastic ring 33 as an annular elastic member is mounted in the annular mounting recess 31. This elastic ring 33
For example, it is formed from a hard synthetic rubber or the like. Note that the annular elastic member may be constituted by an elastic sleeve with a slit made of synthetic resin, a coil spring, or the like, instead of the elastic ring 33.

The retainer 6 is connected to the connection hole 1 of the joint body 2.
It is mounted in advance within 0. Referring to FIG. 2 as well, the retainer 6 includes a plurality of annularly continuous base portions 32 and one end portion (left end portion in FIG. 1) of the annular base portion 32 provided at intervals in the circumferential direction. And six engaging claws 34 in the illustrated form, and a slit 35 extending in the axial direction is formed between the adjacent engaging claws 34. Each engagement claw portion 34 extends axially from one end of the base portion 32,
The tip has a claw 36 projecting inward in the radial direction. The circle defined by the tips of the claws 36 of the engaging claws 34 is set smaller than the outer diameter of the peak 18a of the corrugated pipe 18 to be inserted and larger than the outer diameter of the valley 18b. Since the engagement claw portions 34 are separated by the slits 35, the base portions,
That is, the diameter can be increased outward in the radial direction and reduced inward in the radial direction with the connection point with the base portion 32 as a fulcrum.

Such a retainer 6 can be formed from a metal material such as brass, a synthetic resin material, or the like. The retainer 6 is a composite material using the engaging claw portion 34 as a metal material and the base portion 32 as a synthetic resin material. It can also be formed from a material.

The retainer 6 is mounted in the joint body 2 as shown in FIG. The other end of the base portion 32 of the retainer 6 is integrally provided with an annular engaging projection 38 projecting outward in the radial direction. When the retainer 6 is inserted into the connection hole 10 of the joint body 2, the base portion 32 is held radially inward of the positioning protrusion 26, and the engagement protrusion 38 abuts on the positioning protrusion 26. The joint body 2 is positioned in a predetermined positional relationship. In this mounted state, as shown in FIG. 1, the pawls 36 of the engaging pawls 34 of the retainer 6 are located radially inward facing the annular recess 24 of the joint body 2, so that these pawls 36 are located outside the radial direction. Is allowed to move to the
Can be enlarged. In this embodiment, the joint body 2 is provided with the annular concave portion 24 to allow the engaging claw portion 34 of the retainer 6 to increase in diameter. However, in order to have the same function as the annular concave portion 24, the joint body 2 The inner diameter of the connection hole 10 may be increased over the entire length.

In this embodiment, the distal end surface of the positioning projection 26 is formed in a short cylindrical shape. With this configuration, the outer peripheral surface of the base portion 32 of the retainer 6 is mounted on the peripheral surface of the distal end surface, and both peripheral surfaces come into contact with each other over a predetermined range in the axial direction. Can be held concentrically with respect to.

The retainer 6 has a small pressing force (for example, a force acting when the tightening member 4 is manually tightened, since the annular engaging protrusion 38 abuts the positioning protrusion 26 of the joint body 2). Even if a force acting when the corrugated pipe 18 is inserted acts on the joint body 2, it does not separate from the joint body 2, but when a large pressing force is applied (for example, when the tightening member 4 is tightened using a tightening tool). When a force to the extent that it acts is applied, the annular engaging projection 38 of the retainer 6 and / or the positioning projection 26 of the joint main body 2 elastically deform (or plastically deform) to cross over the annular projection 26 of the joint main body 2, thus When it gets over, it separates from the joint body 2.

Referring again to FIG. 1, the tightening member 4 is formed of, for example, a nut, and the through-hole 42 extends through the tightening member 4 in the axial direction (the left-right direction in FIG. 1). Corrugated pipe 18 which is formed and to be connected
Is connected to the connection hole 10 of the joint body 2 through the through hole 42.
Is inserted into. A male screw portion 44 is provided on the outer peripheral surface near one end of the fastening member 4. Male thread 4 of tightening member 4
4 is screwed into the female screw portion 28 of the joint body 2,
And the fastening member 4 are screwed together. Also, the fastening member 4
Is provided at one end portion thereof with a pressing portion 46 projecting toward the joint body 2 in the axial direction. The pressing portion 46 is provided in a ring shape in this embodiment, but a plurality of pressing portions 46 may be provided at intervals in the circumferential direction. This pressing portion 46
Is provided corresponding to the base portion 32 of the retainer 6, and acts on the end face of the base portion 32 of the retainer 6 when the fastening member 4 is tightened as described later.

In this embodiment, the base 32 of the retainer 6
By slightly increasing the inside diameter of the other end of the
Are formed, and the annular pressing portion 46 of the fastening member 4 acts on the step portion 47. With this configuration, the retainer 6 can be held concentrically with respect to the tightening member 4 by the pressing portion 46, and the peak portion 18a of the corrugated pipe 18 can be reliably crushed as described later. it can.

The deformation preventing portion 45 is provided on the outer periphery of the pressing portion 46.
Are provided integrally. The outer diameter of the deformation preventing portion 45 is substantially equal to or slightly smaller than the outer diameter of the engaging projection 38 of the retainer 6, and its distal end surface is somewhat axially inward of the distal end portion of the pressing portion 46. 1 and the rear end surface of the engagement protruding portion 38 of the retainer 6 and the front end surface of the deformation preventing portion 45 in a state where the front end surface of the pressing portion 45 acts on the step portion 47 of the retainer 6 (FIG. 1). At the right end face). By providing such a small gap, a slight elastic deformation of the engagement protrusion 38 is allowed, and thereby the diameter of the plurality of engagement claws 34 can be easily increased. If the diameter of the engaging claw is allowed to increase,
The gap described above may be substantially eliminated, and the front end surface of the deformation preventing portion 45 may be brought into contact with the rear end surface of the engaging projection 38 of the retainer 6.

The outer peripheral surface of the other end portion 49 of the tightening member 4 is formed in a hexagonal shape, and an inner side of the hexagonal end portion 49 of the tightening member 4 is formed with an annular concave portion. A rectangular selectively permeable seal member 48 is mounted. The permselective seal member 48 is made of, for example, porous polyethylene, and prevents water or the like from entering the inside of the joint from the outside. When gas leaks from between the tube 54 and the corrugated pipe 18, the leaked gas is
8 is allowed to leak to the outside. The latter leak occurs when a hole is made in a part of the corrugated pipe 18 or the like. The soundness of the piping system can be confirmed by checking that there is no leak from the leak portion to the outside with a leak detecting means such as a soapy water application or a gas detector. Further, an annular concave portion 50 is formed on the inner peripheral surface of the other end portion 49 of the fastening member 4, and an annular seal 52 having a substantially T-shaped cross section is mounted in the annular concave portion 50. This annular seal 52
Seals the space between the protection tube 54 covering the corrugated pipe 18 and the fastening member 4. This fastening member 4 can be formed of, for example, brass.

Next, a method for connecting the corrugated pipe 18 using the above-described corrugated pipe joint will be described with reference to FIGS. As shown in FIG. 1, the corrugated pipe 18 is formed in a wave shape, and peaks 18a and valleys 18b are provided alternately. The corrugated pipe 18 is covered by a synthetic resin protective tube 54 over its entire length.

When connecting the corrugated pipe 18, first, a part of the protective tube 54 covering one end of the corrugated pipe 18 is removed, and several peaks, for example, four to six peaks, are exposed from one end of the corrugated pipe 18. . Further, a state in which the joint body 2 and the fastening member 4 are screwed in advance, for example, the fastening member 4
Is screwed until the pressing portion 46 of the retainer 6 contacts the step portion 47 of the retainer 6. In this embodiment, since the retainer 6 is attached to the joint main body 2, a spacer for holding both at a predetermined position is not required.

Next, when the joint body 2 and the fastening member 4 are screwed together, one end of the corrugated pipe 18 (the end from which the protective tube 54 has been removed) is passed through the through-hole 42 of the fastening member 4 to the left in FIG. In the direction indicated by arrow 23. When inserted, as shown in FIG. 3, the crests 18 a of the corrugated pipe 18 become the claw 36 of the engagement claw 34 of the retainer 6.
, These engaging claws 34 expand in diameter and climb over the ridges 18a. At this time, the elastic ring 33 attached to the joint body 2 is elastically deformed, and thus elastically deformed, so that the diameter of the engaging claw portion 34 can be increased. When the valleys 18b of the corrugated pipe 18 are located at the claws 36 of the engaging claws 34, the engaging claws 34 are reduced in diameter and engage with the valleys 18b. At this time, the elastic ring 33 elastically deformed by the diameter expansion of the engaging claw portion 34 returns to the original state, and the diameter of the engaging claw portion 34 is reliably reduced by the elastic restoring action.

In this embodiment, as shown in FIG. 1, the distance from the shoulder 12 of the joint body 2 to the pawl 36 of the engaging pawl 34 of the retainer 6 is set to the length of about one peak of the corrugated pipe 18. ing. Therefore, when the corrugated pipe 18 is inserted as described above, the first crest 18a from the tip of the corrugated pipe 18 passes through the claw 36 of the retainer 6, but the second crest 18a from the tip is corrugated. Since the distal end of the pipe 18 abuts on the shoulder 12 of the joint body 2, it cannot pass through the pawl 36, and the pawl 36 of the engaging pawl 34 of the retainer 6
It engages with the valley 18b next to the first peak 18a from the tip. In this way, by configuring the engaging claw portion 34 to engage with the valley portion 18b next to the first peak portion 18a from the tip of the corrugated pipe 18, the insertion confirmation function can be provided. That is, when the corrugated pipe 18 is inserted as required, the engaging claws 34 of the retainer 6 are engaged with the valleys 18 b of the corrugated pipe 18, and thus the corrugated pipe 18 is pulled out even if it is to be pulled out. Can not do. Particularly, the engagement claw 3 is formed by the action of the elastic ring 33.
Since the diameter of 4 is reduced, the claw 36 of the engagement claw portion 34 is securely engaged with the valley portion 18b of the corrugated pipe 18, and the above-described disengagement is prevented. On the other hand, when the corrugated pipe 18 is not inserted as required, the engaging claw 3 of the retainer 6
4 is not engaged with the valley 18b of the corrugated pipe 18,
Therefore, if the corrugated pipe 18 is to be pulled out, it can be easily pulled out. Therefore, the corrugated pipe 1
Whether or not the corrugated pipe 8 can be pulled out can be confirmed to be inserted into the corrugated pipe 18. Further, by projecting one ridge of the corrugated pipe 18 from the engaging claw portion 34 of the retainer 6 in this manner, the number of crushed ridges of the corrugated pipe 18 is reduced, and the axial length of the entire joint is reduced. be able to. In this embodiment, the pawl 3 of the engaging pawl 34 of the retainer 6 is moved from the shoulder 12 of the joint main body 2.
Although the distance up to 6 is set to the length of about one peak of the corrugated pipe 18, this distance can be set to the length of a plurality of peaks of the corrugated pipe 18, for example, 2 to 5 peaks, The number of peaks corresponds to the number of peaks to be crushed.

Thereafter, the tightening member 4 is tightened using a tightening tool (not shown). When the tightening member 4 is tightened using a tightening tool, the pressing portion 46 of the tightening member 4 acts on the base portion 32 of the retainer 6, and a large pressing force by the tightening tool acts to cause the retainer 6 to move the joint body 2. Break away from At this time, as shown in FIG. 4, the engaging projection 38 of the retainer 6 attempts to deform in the direction opposite to the insertion direction, but since the fastening member 4 has the deformation preventing The deformation of the portion 38 is reliably prevented by the deformation preventing portion 45, the diameter of the engaging claw portion 34 is prevented from expanding at the time of disengagement from the joint body 2, and the corrugated pipe 18 is pulled out (opposite to the direction indicated by the arrow 23). Direction), the corrugated pipe 18 does not come off from the pawl 36 of the engaging pawl of the retainer 6.
The retainer 6 is detached mainly by deforming the positioning projection 26 of the joint body 2 as shown in FIG.

When the tightening member 4 is further tightened, the tightening member 4
The pressing portion 46 moves the retainer 6 engaged with the valley 18 b of the corrugated pipe 18 toward the shoulder 12 of the joint body 2, and the outer peripheral portion of the distal end of the engaging claw 36 of the retainer 6 is Of the engaging claw 34 of the retainer 6 is reliably prevented from being expanded, and the claws 36 of the engaging claw 34 are
8 acts so as to bite into the valley portion 18 b of the corrugated tube 8, so that the peak portion 18 a of the corrugated pipe 18 protruding from the retainer 6 can be reliably moved toward the shoulder portion 12 of the joint body 2. In addition,
As can be easily understood, the inner diameter of the fitting inner surface 22 of the joint body 2 is gradually reduced in the axial direction in a tapered shape, but the inner diameter may be the same in the axial direction.

When the tightening member 4 is tightened as required in this way, as shown in FIG.
The ridge 18a of the corrugated pipe 18 protruding from the joint 4 is crushed by being sandwiched between the shoulder 12 and the retainer 6, and the tip of the crushed ridge 18a is connected to the heat-resistant gasket 16 of the shoulder 12 of the joint body 2. It is press-contacted, and the space between the distal end of the corrugated pipe 18 and the joint body 2 is reliably sealed by the heat-resistant gasket 16.

As described above, when the joint body 2 and the fastening member 4 are screwed together, one end of the corrugated pipe 18 is inserted through the through hole 42 of the fastening member 4, and then the fastening member 4 is removed. The corrugated pipe 18 can be connected by a simple operation of tightening using a tightening tool.

FIG. 6 is a sectional view showing a part of a modified form of the joint for a corrugated pipe. In this modified form, the fastening member is modified. In the following description, substantially the same members as those in the above-described embodiment are denoted by the same reference numerals,
The description is omitted.

Referring to FIG. 6, in this modification, the deformation preventing portion of the tightening member 4A is composed of the pressing portion 46 and a separate sleeve member 61.
Are mounted on the outer peripheral surface of the pressing portion 46. Even if the deformation preventing portion is formed of the separate sleeve member 61, the deformation of the engaging projection 38 of the retainer 6 at the time of disengagement from the joint main body 2 is prevented, as described above.
8 can be prevented. The other configuration of this modified embodiment is substantially the same as the above-described embodiment.

FIG. 7 is a cross-sectional view showing a part of another modification of the corrugated pipe joint. In this modification, an annular elastic member for reducing the diameter of the engaging claw of the retainer is attached to the retainer. ing.

Referring to FIG. 7, in this modified embodiment, the annular elastic member is constituted by a substantially C-shaped leaf spring 63, and this leaf spring 63 is formed by a plurality of engaging claws 34 of the retainer 6. It is mounted on the outer peripheral surface. Note that, in order to prevent the leaf spring 63 from being detached, an annular concave portion may be provided on the outer peripheral surface of the plurality of engaging claws 34, and the leaf spring 63 may be attached to the annular concave portion. Further, the outer diameter of the base portion 32 of the retainer 6 is formed to be slightly smaller than the inner diameter of the positioning projection 26 of the joint body 2, and the nut 4 is screwed into the annular engagement projection 38 of the retainer 6 to position the joint body 2. By contacting the projection 26, the retainer 6 is held at the position shown in FIG. 7 (sandwiched between the joint main body 2 and the nut 4), and the spacer can be omitted in this case. Other configurations of this modification are substantially the same as those of the above embodiment.

Even when the leaf spring 63 is mounted on the retainer 6, the diameter of the plurality of engaging claws 34 is allowed to increase due to the elastic deformation of the leaf spring 63, and the elastically deformed leaf spring 63 returns to its original shape. By returning to the state, the plurality of engagement claws 3
4 is reduced in diameter, so that the same effect as provided in the joint body 2 is achieved. In addition, instead of the leaf spring 63, the annular elastic member to be mounted on the retainer 6 may be constituted by, for example, an elastic sleeve.

While the embodiments and modifications of the joint for corrugated pipes according to the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and corrections can be made without departing from the scope of the present invention. Is possible.

For example, in the illustrated embodiment, the base portion 32 of the retainer 6 is formed in a continuous annular shape. However, the present invention is not limited to this. The base portion 32 may be formed in a substantially C-shape with a portion cut away. In such a configuration, the base portion itself is also expanded in diameter,
Reduce diameter.

In the illustrated embodiment, the pressing portion 46 of the fastening member 4 acts on the base portion 32 of the retainer 6. It can be configured to act on the engagement claw portion 34.

Further, in the illustrated embodiment, an annular elastic member for reducing the diameter of the plurality of engaging claws 34 of the retainer 6 is mounted on the joint body 4 (or the retainer 6). When the diameter of the claw portion 34 is sufficiently reduced, the annular elastic member can be omitted.

[0046]

According to the joint for a corrugated pipe of the first aspect of the present invention, the deformation preventing portion is provided on the fastening member, so that the deformation of the engaging projection of the retainer at the time of disengagement from the joint main body is reduced. This is prevented by the deformation preventing portion, whereby the plurality of engaging claws are prevented from increasing in diameter, and the corrugated tube can be reliably prevented from coming off.

Further, according to the joint for a corrugated pipe of the second or third aspect of the present invention, since the annular elastic member is provided in the joint body or the retainer, the diameter of the retainer expanded by the elastic restoring action of the annular elastic member. The dowel portion can be reliably reduced in diameter and engaged with the valley portion of the corrugated pipe.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an upper half of an embodiment of a joint for a corrugated pipe according to the present invention.

FIG. 2 is a half sectional view showing an upper half of a retainer of the corrugated pipe joint of FIG. 1 in a sectional view.

FIG. 3 is a partial cross-sectional view showing a state in which an engaging claw portion of a retainer gets over a corrugated portion of a corrugated pipe in the joint for a corrugated pipe of FIG. 1;

FIG. 4 is a partial cross-sectional view showing a state when the retainer is separated from the joint body in the joint for a corrugated pipe of FIG. 1;

FIG. 5 is a partial cross-sectional view showing a state where a corrugated pipe is connected in the corrugated pipe joint of FIG. 1;

FIG. 6 is a partial sectional view showing a part of a modified form of the joint for a corrugated pipe.

FIG. 7 is a partial sectional view showing a main part of another modification of the joint for a corrugated pipe.

[Explanation of symbols]

 2 Joint body 4, 4A Tightening member 6 Retainer 10 Connection hole 12 Shoulder 18 Corrugated tube 18a Crest 18b Valley 22 Fitting inner surface 24 Fitting recess 26 Positioning protrusion 28 Female thread 32 Base 33 Elastic ring 34 Engagement claw Part 36 Claw 38 Engagement protrusion 42 Through hole 44 Male screw part 46 Pressing part 61 Sleeve member 63 Leaf spring

Claims (3)

[Claims] 1. A joint body having a connection hole extending in an axial direction, a fastening member having a through hole extending in an axial direction, and a retainer engaging with a corrugated pipe inserted through the through hole of the fastening member. A joint for a corrugated pipe in which the joint body and the tightening member are screwed to each other, wherein the retainer is provided at an annular base portion and at one end of the base portion at intervals in a circumferential direction. A plurality of engaging claws provided, and an engaging protrusion provided at the other end of the base portion, wherein the plurality of engaging claws are capable of expanding and reducing in diameter; The joint body includes a shoulder facing the fastening member, a fitting inner surface provided adjacent to the shoulder, into which the plurality of engaging claws of the retainer fit, and the coupling of the retainer. And a positioning projection that engages with the projection. A pressing portion acting on the base portion or the plurality of engaging claws of the retainer, and a deformation preventing portion for preventing deformation of the engaging protrusion of the retainer; When inserted through the through hole of the tightening member, the plurality of engaging claw portions of the retainer,
When the diameter is increased to get over the peak of the corrugated pipe, the diameter is reduced to engage the valley of the corrugated pipe, and when the tightening member is tightened, the pressing portion of the tightening member causes the base of the retainer to move. Or the plurality of engaging claws, whereby the retainer moves in the axial direction relatively to the joint body, whereby the engaging protrusion of the retainer causes the engaging protrusion of the joint body to move. The corrugated pipe joint, wherein the retainer is detached from the positioning protrusion, and the retainer is fitted into the fitting inner surface of the joint body. 2. The joint body is provided with an annular elastic member corresponding to the plurality of engaging claws of the retainer,
2. The annular elastic member according to claim 1, wherein the annular elastic member is elastically deformed to allow the plurality of engaging claws to increase in diameter, and is elastically restored to reduce the diameter of the plurality of engaging claws. Fitting for corrugated pipe. 3. An annular elastic member is mounted on an outer peripheral surface of the plurality of engaging claws of the retainer, and the annular elastic member is elastically deformed to allow the plurality of engaging claws to increase in diameter. And
2. The joint for a corrugated pipe according to claim 1, wherein the plurality of engagement claws are reduced in diameter by elastic recovery.