JP2000055260A - Coupler for corrugate pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a corrugate pipe as required in simple constitution. SOLUTION: This coupler is furnished with a coupler main body 2 having a through hole 8 and a female screw part 26, a nut 4 having a male screw part 38 to be screwed in the female screw part 26 of the coupler main body 2 and a spacer 6 to hold the coupler main body 2 and the nut 4 in a specified positional relation. The nut 4 is furnished with a nut main body part 30 on which a male screw part 38 is provided and a retainer part 32 integrally provided on the nut main body part 30, and the retainer part 32 has an engagement click part to be engaged with a trough part 18b of a corrugate pipe 18. When the nut 4 is fastened and large torque works between the nut main body 30 and the retainer 32, the nut main body 30 and the retainer part 32 are separated from each other, and relative rotation of both of them is allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a 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 have been proposed and put to practical use for connecting corrugated pipes. As an example of this corrugated pipe joint, for example, Japanese Patent No.
No. 86237 and Japanese Patent No. 2726380. Such a known joint includes a joint body, a nut screwed to the joint body, and a retainer rotatably engaged with the nut. A through hole is formed in the joint body, a through hole is formed in the nut, and one end of the corrugated pipe to be connected is inserted into the joint body through the through hole in the nut. The retainer has a plurality of engagement protrusions,
These engagement projections expand and climb over the peaks of the corrugated pipe, and contract to engage the valleys of the corrugated pipe. Further, a spacer is interposed between the joint body and the nut to maintain the two in a predetermined positional relationship.

In this known joint, the corrugated pipe can be connected by inserting the corrugated pipe through the through hole of the nut, removing the spacer, and tightening the nut. That is, when the distal end of the corrugated pipe is inserted through the through hole of the nut, the plurality of engaging projections of the retainer engage with the valleys that follow about one peak of the distal end of the corrugated pipe. Then, when the retainer is removed and the nut is tightened in such a state, the retainer moves toward the shoulder of the joint body by the action of the nut, 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]

This known joint comprises a joint body and a nut which are screwed together, a retainer engaged with the nut, and a spacer interposed between the joint body and the retainer. , The number of its basic components is four. Therefore, the configuration is somewhat complicated in this connection, the number of components is large, and further simplification of the configuration has been desired.

An object of the present invention is to provide a joint for a corrugated pipe capable of connecting a corrugated pipe as required with a simple structure.

[0006]

SUMMARY OF THE INVENTION The present invention has a joint body having a through hole and a thread portion extending in an axial direction, and a through hole extending in an axial direction and a thread portion screwed to the thread portion of the joint body. What is claimed is: 1. A joint for a corrugated pipe, comprising: a nut; a joint main body; and a spacer for holding the nut in a predetermined positional relationship, wherein the nut includes: a nut main body provided with the screw portion; A retainer portion provided integrally with the portion, wherein the retainer portion has a plurality of engagement claws arranged at intervals in a circumferential direction, and the plurality of engagement claws are The nut body portion and the retainer portion are provided so as to be freely expandable and contractable, and the nut body portion and the retainer portion are configured to be separated when a large torsion force acts between them, and the joint body includes a shoulder portion facing the nut side. And adjacent to the shoulder And a fitting inner surface into which the plurality of engaging claws of the retainer section are fitted. When the corrugated pipe is inserted through the through hole of the nut, the plurality of retainer sections are The engaging claws are expanded and climb over the peaks of the corrugated pipe, contracted and engaged with the valleys of the corrugated pipe, and tightened the nut to secure the nut body and the retainer. When a large torsion force acts between the nut body and the retainer, the torsion force separates the nut body and the retainer, thereby permitting relative rotation between the nut body and the retainer.

According to the present invention, the nut screwed into the joint main body has a nut main body and a retainer provided integrally with the nut main body. In addition to the nut, there are three parts: the joint body and the spacer, whereby the configuration of the entire joint can be simplified as compared with the related art. Further, the retainer portion has a plurality of engaging claws, and these engaging claws are expanded and climb over the ridges of the corrugated pipe, contracted and engaged with the valleys of the corrugated pipe. The valley at the tip of the corrugated tube can be engaged with the engaging claw through the portion. Furthermore, since a large torsion force acts between the nut body and the retainer, the two separate from each other, so that when the nut is tightened and the ridge of the corrugated pipe is crushed, the two separate, As a result, relative rotation between the two is allowed, and therefore, no excessive twisting force acts on the corrugated pipe when the ridge of the corrugated pipe is crushed.

Further, the present invention is characterized in that the nut body and the retainer of the nut are integrally connected via a thin portion which is cut when a large torsion force is applied.

According to the present invention, since the nut body and the retainer are connected via the thin portion, when a large torsion force acts between the two, the thin portion is cut, and thereby the relative position between the two is reduced. Rotation is allowed. In this case, the nut body and the retainer are integrally formed from the manufacturing stage.

Further, the present invention is characterized in that the nut body and the retainer of the nut are integrally provided via a tape or an adhesive layer which peels off when a large torsional force acts.

According to the present invention, since the nut body and the retainer are connected via a tape or an adhesive layer,
When a large torsional force acts between the two, the retainer portion peels off, thereby allowing relative rotation between the two. In this case, after the nut main body and the retainer are formed separately, they are integrally fixed by a tape or an adhesive.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a joint for a corrugated pipe according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a half sectional view showing an embodiment of a corrugated pipe joint according to the present invention in an upper half in section, and FIG. 2 is a half sectional view showing an upper half of a nut of the corrugated pipe joint in FIG. 1 in a sectional view. FIG. 3 is a half cross-sectional view showing a state in which a retainer portion is separated from a nut main body portion in a cross section of an upper half, and FIG. 4 is a half view showing a state where a corrugated pipe is connected in the corrugated pipe joint of FIG. FIG. 5 is a sectional view, and FIG.
FIG. 5 is a partially enlarged sectional view showing a part of the connection state of FIG. 4 in an enlarged manner.

The corrugated pipe joint shown in FIG.
And a nut 4 screwed to the joint body 2 and a spacer 6 interposed between the joint body 2 and the nut 4. One end side of the joint body 2 (left end side in FIG. 1)
Is formed with a through hole 8 extending in the axial direction (the left-right direction in FIG. 1), and the other end side (the right end side in FIG. 1).
Is formed with a connection hole 10 extending in the axial direction, and the through hole 8 and the connection hole 10 communicate with each other. Referring to FIG. 5 as well, in this joint body 2, an annular shoulder 12 is provided at the back of connection hole 10, and this shoulder 12 is
Side, that is, toward the right side in FIG.
An annular concave portion 14 is provided in the shoulder portion 12, and a ring-shaped heat-resistant gasket 16 is mounted on the annular concave portion 14. Seal between In addition, the nut 4 is provided in the inner peripheral portion of the shoulder portion 12 in the axial direction.
An annular projection 20 extending toward the side is provided integrally, and as can be understood from FIGS. 1, 4 and 5, the inner peripheral surface of one end of the corrugated pipe 18 to be inserted. To keep it concentric.

A connection 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 the taper shape in the direction of insertion of the corrugated pipe 18 (to the left in FIGS. 1 and 5). The nut 4 is located adjacent to the fitting inner surface 22.
An annular recess 24 is provided on the side. Further, a female screw portion 26 is provided on the nut side 4 adjacent to the annular concave portion 24, and the female screw portion 26 is provided to the other end of the joint body 2. The outer peripheral surface of the intermediate portion of the joint body 2 is formed in a hexagonal shape, and a male screw portion 28 is provided on the outer peripheral surface of one end. Such a joint body 2 is formed of a metal material such as brass, for example.

Referring to FIG. 1 and FIGS. 2 and 3, the nut 4 includes a nut main body 30 and a retainer 32 provided integrally with the nut main body 30. Are connected via a thin portion 34. The nut 4, that is, the nut body 30 and the retainer 32, are formed with through holes 36 extending therethrough in the axial direction (left and right directions in FIGS. 1 and 2). Is the through hole 3
6 is inserted into the connection hole 10 of the joint body 2.

An external thread 38 is provided on the outer peripheral surface of one end of the nut body 30. The external thread 38 of the nut body 32 is screwed into the female thread 26 of the joint body 2, and the joint body 2 and the nut 4 are mutually screwed. The outer peripheral surface of the other end of the nut body 30 is formed in a hexagonal shape.
An annular recess is formed on the inner surface of the hexagonal end of the nut body 30, and a selectively permeable seal member 40 having a rectangular cross section is mounted in the annular recess as shown in FIG. The permselective sealing member 40 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 18, the gas is allowed to pass through this seal member 40 and leak to the outside. The latter leak occurs when a hole is made in a part of the corrugated pipe 18 or the like. It is possible to confirm the soundness of the piping system by confirming that there is no leak from the seal portion to the outside with a leak detecting means such as soapy water application and a gas detector. Although not shown, an annular seal for sealing between the protection tube 42 covering the corrugated pipe 18 and the nut main body 30 can be provided on the inner peripheral surface of the nut main body 30.

The retainer portion 32 is integrally provided at one end of the nut body 30 with a thin portion 34 interposed therebetween. When the retainer portion 32 is provided via the thin portion 34 in this manner, both are formed integrally from the manufacturing stage, and the number of parts can be reduced from the manufacturing stage. Retainer part 3
2 is an annular base portion 44 connected to the thin portion 34
And a plurality (six in the illustrated embodiment) of engagement pawls 46 provided at one end (the left end in FIGS. 1 to 3) of the annular base 44 at intervals in the circumferential direction. A slit extending in the axial direction is formed between the adjacent engaging claws 46. Each engaging claw portion 46 extends in the axial direction from one end of the base portion 44, and has a claw 48 protruding radially inward at a distal end portion thereof. The circle defined by the tips of the claws 48 of the engaging claws 46 is the corrugated pipe 18 to be inserted.
Is smaller than the outer diameter of the valley portion 18a and larger than the outer diameter of the valley portion 18b. Since the engaging claw portions 46 are separated by slits, the elastic portions have their own elasticity,
The base portion, that is, the connection portion with the base portion 44 can be used as a fulcrum to expand radially outward and contract radially inward. Therefore, the peak 18a of the corrugated pipe 18
When they pass through the pawls 48 of the engaging pawls 46, the engaging pawls 46 expand and climb over the peaks 18a, and the valleys 18b of the corrugated pipe 18 move the pawls 48 of the engaging pawls 46 over. When passing, the engaging claws 46 are reduced to reduce the valleys 18.
b.

By configuring the nut 4 in this manner, when a small torsion force (for example, a force acting when the nut 4 is turned by hand) acts between the retainer portion 32 and the nut body portion 30, The thin portion 34 is not cut, but when a large break-in force (for example, a force acting when the nut 4 is turned by using a tightening tool) acts between the two, the thin portion 34 becomes Disconnected
This allows the relative rotation between the two. The thin portion 34 is not cut when the corrugated pipe 18 is inserted. The nut 4 is formed from a metal material such as brass, for example.

In this joint, the joint body 2 and the nut 4 are screwed in advance, and a spacer 6 is used to hold the two in a predetermined positional relationship. As shown in FIG.
Is attached between the other end surface of the joint main body 2 and the inner surface of the hexagonal end of the nut main body 30 of the nut 4 by tightening the nut 4 by hand, for example. keep. The spacer 6 is formed of, for example, a synthetic resin material and is formed of a substantially C-shaped member that can be elastically deformed.

The joint body 2 and the nut 4 using the spacer 6
Is held in a predetermined positional relationship, as shown in FIG. 1, the pawls 48 of the retainer portion 32 of the nut 4 are located opposite to the annular concave portion 24 of the joint body 2, and therefore, these pawls 48 are located outside of the radial direction. The engagement claw portion 46 can be expanded. In this embodiment, the joint body 2 is provided with the annular concave portion 24 to allow the engaging claw portion 46 of the retainer portion 32 to expand, but in order to have the same function as the annular concave portion 24, the joint body 2 is provided. The inner diameter of the second connection hole 10 may be increased over the entire length.

Referring mainly to FIGS. 1, 4 and 5,
A method of connecting the corrugated pipe 18 will be described. 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,
As shown in FIG. 1, a part of the protective tube 54 covering one end of the corrugated pipe 18 is removed, and the corrugated pipe 1 is removed.
A few peaks, for example, 4 to 6 peaks, are exposed from one end of 8. Further, the joint body 2 and the nut 4 are screwed together, and the two are held in a predetermined positional relationship via the spacer 6 in advance.

Then, in such a threaded state, one end of the corrugated pipe 18 (the end from which the protective tube 54 has been removed) is inserted through the through hole 36 of the nut 4 to the left in FIG. When inserted in this manner, when the peaks 18a of the corrugated pipe 18 pass through the claws 48 of the engaging claws 46 of the retainer portion 32, these engaging claws 46 expand and climb over the peaks 18a, and The valley portion 18b is engaged with the engagement claw portion 46.
When passing through the claw 48, these engagement claw portions 46 contract and engage with the valley portions 18b.

In this embodiment, when the joint body 2 and the nut 4 are held in the predetermined positional relationship shown in FIG. 1 via the retainer 6, from the shoulder portion 12 of the joint body 2 to the claw 48 of the retainer portion 32 of the nut 4. Is set to a length of about one peak of the corrugated pipe 18. 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 48 of the retainer portion 32, but the second crest 18a from the tip is Since the tip of the corrugated pipe 18 is in contact with the shoulder 12 of the joint body 2, it cannot pass through the claw 48, and the claw 48 of the engaging claw 46 of the retainer 32 has the first peak from the tip. Part 1
Engage with the valley 18b next to 8a. Thus, the valley 1 next to the first peak 18a from the tip of the corrugated pipe 18
By configuring the engaging claw portion 46 to engage with the engaging claw 8b, an insertion confirmation function can be provided. That is, when the corrugated pipe 18 is inserted as required, the engaging claws 46 of the retainer 32 are engaged with the valleys 18 b of the corrugated pipe 18, so that even if the corrugated pipe 18 is to be pulled out, it is pulled out. I can't pull it out. On the other hand, when the corrugated pipe 18 is not inserted as required, the engaging claw 46 of the retainer 32 is
Therefore, if the corrugated tube 18 is to be pulled out, it can be easily pulled out. Thus, the insertion of the corrugated pipe 18 can be confirmed based on whether or not the corrugated pipe 18 can be pulled out. Further, as described above, by projecting one ridge of the corrugated pipe 18 from the engaging claw portion 46 of the retainer part 32, the number of crushed ridges of the corrugated pipe 18 is reduced, and the axial length of the entire joint is reduced. can do. In addition,
In this embodiment, the distance from the shoulder 12 of the joint main body 2 to the claw 48 of the engaging claw 46 of the retainer 32 is set to be approximately one mountain of the corrugated pipe 18. The length of the corrugated pipe 18 can be set to a plurality of ridges, for example, 2 to 5 ridges, and the number of ridges corresponds to the number of crushed peaks.

Thereafter, the spacer 6 is removed, and the nut 4 is tightened using a tightening tool (not shown). When the nut body 30 of the nut 4 is tightened by using a tightening tool, the engaging claw 46 of the retainer 32 is engaged with the valley 18 of the corrugated pipe 18.
In the state of engagement with the engaging claw portion 46 of the retainer portion 32, the crest portion 18a is moved toward the shoulder portion 12 of the joint body 2.
Of the engaging claw 46 of the retainer portion 32 is reliably prevented from being expanded by fitting into the fitting inner surface 22 of the joint body 2. 36 acts so as to bite into the valley 18 b of the corrugated pipe 18. 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.

Thus, the peak 1 of the corrugated pipe 18
When the portion 8a is somewhat crushed, the corrugated pipe 18 pressed against the shoulder portion 12 of the joint body 2 exerts a frictional force on the retainer portion 32 to prevent the rotation thereof. When the frictional force acting on the retainer portion 32 increases,
A large torsional force acts between the nut body 30 which is being tightened by a tightening tool (not shown) and the retainer portion 32 where the frictional force acts.
Is cut off. By this cutting, the relative rotation between the retainer portion 32 and the nut body portion 30 is allowed,
Thereafter, when the nut body 30 is further tightened, one end face of the nut body 30 contacts and presses the end face of the base section 44 of the retainer section 32, and the retainer section 32 does not substantially rotate, and the joint body 2 does not substantially rotate. In the axial direction toward the shoulder portion 12 of the corrugated pipe 18, thereby preventing a large torsion force from acting on the corrugated pipe 18.

When the nut 4 is tightened as required in this manner, as shown in FIGS. 4 and 5, the peaks 18 of the corrugated pipe 18 projecting from the engaging claws 46 of the retainer 32.
a is pressed and squeezed between the shoulder portion 12 and the retainer portion 32, and the tip of the crushed crest portion 18 a is pressed against the heat-resistant gasket 16 of the shoulder portion 12 of the joint body 2, and the corrugated pipe 1 is pressed.
8 is securely sealed by the heat-resistant gasket 16 between the joint body 2 and the distal end.

As described above, when the joint body 2 and the nut 4 are in a predetermined screwed state, the corrugated pipe 18
Is inserted through the through hole 36 of the nut 4,
The corrugated pipe 18 can be connected by a simple operation of removing the spacer 6 and tightening the nut 4 with a tightening tool.

Although the embodiment of the joint for a corrugated pipe according to the present invention has been described above, the present invention is not limited to such an embodiment, and various modifications and corrections can be made without departing from the scope of the present invention. It is.

For example, in the illustrated embodiment, the nut body 30 of the nut 4 and the retainer 32 are connected via the thin portion 34, but may be configured as shown in FIG. 6, for example. In this embodiment, the nut body 30A and the retainer 32A of the nut 4A are formed separately. The nut main body 30A and the retainer 32A themselves are substantially the same as the configuration shown in FIGS. 1 to 5, and one end face of the nut main body 30A (the left end face in FIG. 6 and the end face facing the retainer section 32A). And the end surface of the base portion 44 of the retainer portion 32A (the right end surface in FIG. 6, which is the end surface facing the nut body portion 30A), and the adhesive tape 62 is attached to the inner peripheral surface thereof. Are integrally connected via a tape 62. Instead of using the adhesive tape 62, an adhesive can be used and both can be connected via an adhesive layer. Thus, the nut body 30A and the retainer 32A
When the retainer portion 32A is formed separately, the retainer portion 32A can be formed of, for example, a synthetic resin material, a metal material such as brass, or a composite material of a synthetic resin and a metal (at least the nail 48 is preferably a metal material). In this modified nut 4A, the retainer portion 32A and the nut body portion 30 are also provided.
When a small torsion force (for example, a force that acts when the nut 4A is turned by hand) acts on the retainer portion 32A, the retainer portion 32A does not peel off from the adhesive tape 62, but there is a large break between the two. Force (eg nut 4A
When a force is applied which is applied when the screw is turned using a tightening tool, the retainer portion 32A is peeled off from the adhesive tape 62, thereby allowing relative rotation between the two.
Thus, the same effect as the nut 4 shown in FIGS. 1 to 5 is achieved.

[0030]

According to the joint for a corrugated pipe according to the first aspect of the present invention, three basic components are a nut, a joint body and a spacer, and the structure of the entire joint is simplified as compared with the related art. be able to. In addition, the engaging claw of the retainer is expanded and climbs over the peak of the corrugated pipe, contracts and engages with the valley of the corrugated pipe, so that the valley at the tip of the corrugated pipe is engaged through the retainer. It can be engaged with the dowel portion. Furthermore, when the nut is tightened to crush the corrugated pipe ridge, the nut body and the retainer are separated from each other, which allows relative rotation between the two. Therefore, an excessive torsion force acts on the corrugated pipe. Not even.

According to the joint for a corrugated pipe of the second aspect of the present invention, when a large torsion force acts between the nut body and the retainer, the thin portion connecting the two is cut off, whereby the two are cut off. Relative rotation is allowed. Further, according to the joint for a corrugated pipe of claim 3 of the present invention,
When a large torsion force acts between the nut main body and the retainer, the retainer separates from the nut main body, thereby permitting relative rotation between the two.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing one embodiment of a half section of a corrugated pipe joint according to the present invention.

FIG. 2 is a half sectional view showing a half of one side of a nut of the corrugated pipe joint of FIG. 1;

FIG. 3 is a half sectional view showing a state in which a retainer portion is separated from a nut main body portion in the nut shown in FIG.

FIG. 4 is a half sectional view showing a state where a corrugated pipe is connected in the joint for a corrugated pipe of FIG. 1;

5 is a partially enlarged cross-sectional view showing a part of the connection state of FIG. 4 in an enlarged manner.

FIG. 6 is a half sectional view showing a modified form of the nut in a half on one side.

[Explanation of symbols]

 2 Joint main body 4, 4A Nut 6 Spacer 8 Through hole 10 Connection hole 12 Shoulder portion 18 Corrugated tube 18a Crest portion 18b Valley portion 22 Fitting inner surface 24 Annular concave portion 26 Female thread portion 30, 30A Nut main body portion 32, 32A Retainer portion 34 Thin wall Part 36 Through hole 38 Male thread part 44 Base part 46 Engagement claw part 48 Claw 62 Adhesive tape

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinsuke Takahashi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Inventor Takeshi Hashimoto 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Osaka Gas Co., Ltd. F-term (reference) 3H017 CA05

Claims (3)

[Claims] A joint body having an axially extending through hole and a threaded portion; a nut having an axially extending through hole and a threaded portion screwed to the threaded portion of the joint body; What is claimed is: 1. A joint for a corrugated pipe comprising a spacer for holding a nut in a predetermined positional relationship, wherein the nut is provided integrally with the nut body provided with the screw portion and the nut body. A retainer portion, wherein the retainer portion has a plurality of engaging claws arranged at intervals in a circumferential direction, and the plurality of engaging claws are provided to be able to expand and contract freely. The nut body and the retainer are configured to separate when a large torsion force acts between them, and the joint body is adjacent to the shoulder facing the nut and adjacent to the shoulder. The retainer is provided And a fitting inner surface into which the plurality of engaging claws of the portion are fitted. When the corrugated tube is inserted through the through hole of the nut, the plurality of engaging claws of the retainer portion are provided. Is
Expanding and climbing over the peak of the corrugated pipe, contracting and engaging with the valley of the corrugated pipe, tightening the nut and applying a large torsion force between the nut body and the retainer. The torsion force separates the nut body and the retainer, thereby permitting relative rotation between the nut body and the retainer. 2. The nut body according to claim 1, wherein the nut body and the retainer of the nut are integrally connected via a thin wall portion that is cut when a large torsion force is applied. Fitting for corrugated pipe. 3. The nut body according to claim 1, wherein the nut body and the retainer are integrally provided via a tape or an adhesive layer which peels off when a large torsion force is applied. Fitting for corrugated pipe.