JP2857337B2 - Corrugated pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint used for connecting corrugated pipes, and more particularly to a joint which can easily and reliably connect spiral corrugated pipes and has a low manufacturing cost.

[0002]

2. Description of the Related Art Recently, corrugated pipes made of plastic having excellent flexibility have been frequently used as protective pipes for electric wires and cables and culvert drain pipes. The corrugated pipe has a valley (or mountain) spiral type and a valley (or mountain)
Are formed so as to extend in parallel with the circumferential direction, so-called accordion-shaped tubes (hereinafter referred to as tubes with independent waveform waves). And the connection of these corrugated pipes
Conventionally, a cylindrical pipe joint has been used. However, the cylindrical pipe joint has a drawback that the operation of connecting the corrugated pipe using the joint and the operation of removing the corrugated pipe from the joint are troublesome.

[0003] In order to simplify the connection and disconnection work, there has been proposed a pipe joint in which two half-cylinder members covering each half circumference of a corrugated pipe are combined. However, if the two half-cylinder members have different shapes, two sets of molding dies are required, which increases the cost of the dies and the manufacturing cost of the joint. Therefore, a pipe joint in which half cylinder members having the same shape are combined with each other is known. in this case,
The two half-cylinder members can be manufactured using a common mold, so that the manufacturing cost of the joint can be reduced.

[0004] However, in this type of pipe joint,
There has not yet been provided a simple and reliable connection between tubes with spiral waves. For example, Japanese Utility Model Laid-Open No. 62-8649
No. 0 discloses a joint of a corrugated pipe composed of two half-cylinder members having the same shape. In this joint, hook-shaped projections are formed on one side of both side edges of the half-cylinder member, and holes for engaging the hook-shaped projections are formed on the opposite side. With such a structure, one pipe joint can be formed by combining two half-cylinder members having the same shape, and the cost is reduced. However, in this pipe joint, the waveform of the inner peripheral surface of the half-cylinder member is formed in a direction orthogonal to the joint longitudinal axis, and is therefore used exclusively for connection of a pipe with an independent waveform wave,
It cannot be used to connect spiral corrugated tubes.

The pipe joint disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-86940 has two half-cylinder members even if its waveform is formed obliquely so that it can be fitted to a tube with a spiral wave. When molded using a common mold, it is impossible to connect a spiral corrugated pipe using the pipe joint for the following reasons.

That is, in such a pipe joint, when the hook-shaped projections of the half-cylinder member are respectively engaged with the corresponding holes, the corrugated crest formed on the inner peripheral surface of one half-cylinder member and the other half. The peaks of the waveform formed on the inner peripheral surface of the cylindrical member are shifted from each other by a half pitch of the spiral waveform, and the waveforms of the two half cylindrical members are discontinuous as a whole. Therefore, it cannot be fitted to the spiral valley formed on the outer peripheral surface of the spiral corrugated tube.

On the contrary, the ridges of the waveform on the inner peripheral surface of one half-cylinder member are continuous with the ridges of the waveform on the inner peripheral surface of the other half-cylinder member, ie When the relative positions of the half-cylinder members are adjusted so that the waveform of the above becomes spiral as a whole, the positions of the hook-shaped projections and the positions of the holes are shifted by a half pitch of the spiral waveform. In this case, the hook-shaped projection cannot be locked in the hole, and the half-cylinder members cannot be connected to each other.

Japanese Patent Application Laid-Open No. 2-129490 discloses that
A pipe joint having two half-cylinder members used in combination with each other and having no corrugated inner peripheral surface is disclosed. If this type of pipe joint is used, the corrugated pipes can be connected to each other regardless of whether the corrugated pipe has a helical waveform or an independent waveform. However, when the waveform is not formed on the inner peripheral surface of the half-cylinder member, the half-cylinder member of the pipe joint does not mesh with the waveform of the corrugated pipe. Therefore, when a drawing force or the like is applied to the corrugated pipe, the corrugated pipe moves with respect to the pipe joint, and the connection between the corrugated pipes becomes poor. That is, this type of pipe joint has poor reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint for a corrugated pipe in which the corrugated pipes can be easily and reliably connected to each other and the production cost is low.

A joint for a corrugated pipe according to the present invention is a first pipe for covering a half circumference of one side of each of spiral pipes connected to each other.
It comprises a semi-cylindrical member, and a second half-cylinder member for covering the other side half of each of the wave with tube, the first and second half-cylinder member
When combined, the waveform on the inner peripheral surface becomes spiral
That has been formed. Side edges on both sides of the first half cylinder member and the second
Each of the side edges on both sides of the semi-cylindrical member is provided between the engaging portion and the engaged portion .
Has both . The engaging portion and the engaged portion of each half-cylinder member are provided symmetrically with respect to a plane passing through the center P in the longitudinal direction of the half-cylinder member and including the cross section of the half-cylinder member. The first and second half-cylinder members constitute a tubular member that covers the entire circumference of the corrugated tube by combining the two ends so that the directions of both ends are opposite to each other and the inner peripheral surfaces thereof are opposed to each other. When the first and second half cylinder members are combined so as to constitute the cylinder member, the engaging portion of the first half cylinder member engages with the engaged portion of the second half cylinder member, and the second half cylinder member engages with the second half cylinder member. the engagement portion of the semi-cylindrical member that match the engagement engaged portions of the first half cylinder member.

Each of the first and second half-cylinder members has an inner peripheral surface formed in a corrugated shape. This waveform is preferably such that, when viewing one end side of the half-cylinder member from the longitudinal center P of the half-cylinder member on the longitudinal axis passing through the center in the circumferential direction of the half-cylinder member, and the other end side The repetition of peaks and valleys is reversed, so that the center m of the peak width and the center n of the valley width are located at equal distances on both sides from the longitudinal center P of the half-cylinder member. Is done. When the first and second half cylinder members are combined so that the cylinder member is configured,
Waveform of the inner circumferential surfaces of the semi-cylindrical members, that make up the waveforms of complementary shape with respect to the waveform formed on the outer peripheral surface of the wave with tube.

[0012]

When each of the half-cylinder members constituting the joint is provided with an engaging portion and an engaged portion symmetrically with respect to a plane passing through the longitudinal center P of the half-cylinder member and including the transverse cross section of the half-cylinder member, When the half-cylinder members are made to have the same shape, and both the half-cylinder members are combined so that the directions of both ends are opposite to each other and their inner peripheral surfaces are opposed to each other, each engaging portion must be engaged with the corresponding engaged portion. Come together. For this reason, the first and second half-cylinder members can be manufactured using a common mold, and the manufacturing cost of the joint can be reduced.

The waveform of the inner peripheral surface of the half-cylinder member is obtained by repeating peaks and valleys when viewing one end side and the other end side of the half-cylinder member from the longitudinal center P of the half-cylinder member. Is formed in such a way that the center m of the peak width and the center n of the valley width are located at equal distances on both sides from the longitudinal center P of the half-cylinder member, When the waveform is spiral, a spiral waveform complementary to the waveform can be formed. Accordingly, when the joint is formed by two half-cylinder members having the same shape, the waveform of the joint is engaged with the waveform of the spiral wave tube, so that the connection of the corrugated tubes can be reliably performed.

This will be described more specifically with reference to FIG. FIG. 1A shows a state in which the two half-cylinder members 30 and 40 are arranged in exactly the same direction with the inner peripheral surface facing upward. As shown in (a), the first half cylindrical member 3
The waveform of 0 is a waveform on the longitudinal axis X passing through the center in the circumferential direction of the half-cylinder member when the one end and the other end are viewed from the longitudinal center P of the half-cylinder member. Mountain 3
3a and the valley (hatched portion) 33b are formed in such a manner that the repetition thereof is reversed, and the center m of the width of the peak 33a and the center n of the width of the valley 33b are located at equal distances on both sides from the longitudinal center P. (Ie, distance of mP = nP
Distance). The engaging portion (x mark) and the engaged portion (部 mark) of the first half-cylinder member 30 are provided symmetrically with respect to the transverse section P1 of the half-cylinder member passing through the longitudinal center P of the half-cylinder member. ing. Further, the shape and dimensions of the second half-cylinder member 40 are exactly the same as those of the first half-cylinder member 30, and thus the symbols are omitted.

The two half-cylinder members 3 from the state shown in FIG.
When 0 and 40 are combined, one half-cylinder member, for example, 30 is turned over, as shown in FIG.
The inner peripheral surface is made to face the inner peripheral surface of the other half cylindrical member 40 as shown in (c). Then, the engagement part (×
Mark) and the engaged portion (○ mark) can be engaged with each other. Then, when they are engaged, the waveforms of both half-cylinder members become continuous (note that in (c), the half-cylinder member 30 is turned over, so that the valley 33b is hatched, the circle mark of the engagement portion and The crosses of the engaged portions are indicated by broken lines). Therefore, the tube with the spiral wave can be connected in a state where the waveform on the inner peripheral surface is engaged with the waveform on the outer peripheral surface of the tube with the spiral wave.

On the other hand, based on the teaching of Japanese Utility Model Application Laid-Open No. 62-86490, as shown in FIG. 2A, an engaging portion (x mark) is provided on one side edge of the first half cylindrical member 30. If an engaged portion (被) is formed on the other side edge and a spiral waveform is formed on the inner peripheral surface (the second half cylindrical member 40 is also formed in the same shape and size), The two half-cylinder members 30 and 40 (b)
When the engagement portion (○ mark) and the engaged portion (x mark) are combined so as to match with each other, the waveforms of the two half-cylinder members become discontinuous. Further, if an attempt is made to combine the two half-cylinder members so that the waveforms are continuous, the engaging portion and the engaged portion do not match. Therefore, a tube with a spiral wave cannot be connected.

The example of FIG. 1 shows the width of the peak 33a and the valley 33b of the waveform.
Is the same, but even if the width of the peak 33a and the width of the valley 33b are different as shown in FIG. 3, it is possible to connect a tube with a spiral wave by employing the configuration of the present invention. That is, the repetition of the center of the peak width and the center of the valley width when the one end side and the other end side of the half cylindrical member are viewed from the longitudinal center P of the half cylindrical member is opposite. For example, a tube with a spiral wave can be connected.

[0018]

【Example】

[Embodiment 1] Referring to FIGS. 4 to 6, a pipe joint according to a first embodiment of the present invention includes two spiral wave tubes 10,
A first half-cylinder member 30 for covering one half circumference, for example, an upper half circumference of a connection-side end of the corrugated pipes 10 and 20, and a second half circumference of the other end of the corrugated pipe, for example, used for connection of the corrugated pipes 10 and 20. A second half-cylinder member 40 for covering a half circumference.
The half-cylinder members 30 and 40 have the same dimensions and shape, for example, formed by plastic injection molding using the same mold. Further, the outer peripheral surface of the corrugated pipe 10 has a peak 10a.
Is formed in a spiral shape, and peaks 10a and valleys 10b are formed in a waveform that alternately appear in the longitudinal direction of the corrugated tube 10. The outer peripheral surface of the corrugated pipe 20 also has peaks 20a and valleys 20b.
Is formed in a spiral waveform.

More specifically, the first and second half cylinder members 30,
40 includes semi-cylindrical main bodies 31 and 41, respectively, and the main bodies 31 and 41 each have a hollow part 32 for accommodating one half-peripheral part and the other half-peripheral part of the connection-side end of the corrugated pipes 10 and 20. , 42 (see FIG. 5). The inner peripheral surfaces 33 and 43 are provided with the corrugated tube 1.
Waveforms 10a, 10b, 20a, 20 on the outer peripheral surface of 0, 20
It is formed in a shape complementary to b. That is, the first
The inner peripheral surface 33 of the half-cylinder member 30 has a valley 1 on the outer peripheral surface of the corrugated pipe.
0b and 20b, and a valley 33b having a complementary shape with respect to the peaks 10a and 20a on the outer peripheral surface of the corrugated pipe.
It is formed in a spiral shape. Similarly, the second half cylindrical member 4
A peak 43a and a valley 43b are also formed on the inner peripheral surface 43 of the zero.

The waveform of the inner peripheral surface 33 of the first half-cylinder member 30 is shown on the longitudinal axis X passing through the center of the half-cylinder member 30 in the circumferential direction in FIG.
Peaks 33a and valleys 33b on the left and right with respect to the longitudinal center P of
Are formed in such a way that the repetition is reversed. That is, on the right side of the longitudinal center P on the longitudinal axis X of the half-cylinder member 30, the valley 3 extends in a direction away from P.
3b, peaks 33a, valleys 33b, peaks 33a,..., While on the left side of the longitudinal center P, P
33a, valley 33b, and peak 33 in the direction away from
a, valleys 33b,... And mountain 3
The valleys 3a and the valleys 33b are formed such that the center m of the width of the peak 33a and the center n of the width of 33b are located at an equal distance on both sides from the longitudinal center P.

Similarly, the waveform of the inner peripheral surface 43 of the second half-cylinder member 40 is also determined on the longitudinal axis X passing through the center of the half-cylinder member 40 in the circumferential direction. The peak 43a and the valley 43b are formed so that the repetition of the peaks 43a and the valleys 43b is opposite on the left and right.

The first half-cylinder member 30 extends along one side edge of the main body 31 and has a plate-like first extension 34 protruding outward in the radial direction of the main body 31; , And a plate-shaped second extension 35 that projects radially outward of the main body 31. Second half cylindrical member 40
Are a main body 41, a hollow portion 42, an inner peripheral surface 43, and a first extension portion 4 corresponding to the elements 31 to 35 of the first half-cylinder member 30, respectively.
4 and a second extension 45. First and second
The half-cylinder members 30 and 40 are formed by extending the third half-cylinder member 30.
As shown in FIG. 6, the opposed surfaces 34 a, 35 a, 44 a, 45 a of the extension portions 44, 45 of the second half-cylinder member 4, 35 abut against each other as shown in FIG. A cylindrical member that covers the entire circumference is configured.

Further, the longitudinal center P of the first half cylindrical member 30
At a first and a second longitudinal position separated by a first and a second predetermined distance from the cross section P1 passing through the first direction toward the one end S1, a radially outer end of the first extension 34 has a hook-shaped projection ( More generally, engaging portions 36a and 36b are extended portions 3
4 and at the first and second longitudinal positions of the half-cylinder member 30, hook-shaped projections 36 c and 36 d are integrally formed at the radially outer end of the second extension 35. I have. The hook-shaped projections 36a to 36d are
Extends almost upright.

In the third and fourth longitudinal positions separated by the first and second predetermined distances from the center transverse section P1 of the first half-cylinder member 30 toward the other end T1, the first extension 3
4 are formed with holes 37a and 37b, and at the third and fourth longitudinal positions of the member 30, the second extension 35
Are formed with holes 37c and 37d.

Hook-shaped projections 36a, 36b and holes 37a, 37
b are symmetrically arranged with respect to the center cross section P1 of the half-cylinder member 30, and are aligned with each other in the radial direction of the half-cylinder member 30. The hook-shaped projections 36c, 36d and the holes 37c, 37d are formed similarly.

Similarly, the second half-cylinder member 40 is formed with hook-shaped projections 46a to 46d and holes 47a to 47d. And when combining the half-cylinder members 30 and 40 with both ends facing each other, the hook-shaped projections 36a to 36d,
46a to 46d are adapted to insert corresponding holes 47a to 47d and 37a to 37d.

The corrugated pipes 10 and 2 are
When connecting 0, both corrugated pipes 10 and 20 are arranged on the same axis, and the opposing end faces are brought close to or in contact with each other. Next, in a state where one end T2 of the second half-cylinder member 40 faces the corrugated tube 10 side, the half-cylinder member 40 is positioned so that the center in the longitudinal direction of the second half-cylinder member 40 is substantially located at the end face opposing portion of the corrugated tube. The tubular member 40 is disposed below the connection-side end of the double-wavy tube. Then, the inner peripheral surface of the second half cylindrical member 40 is fitted to the lower half peripheral surface of the corrugated tubes 10 and 20. At this time, the corrugated pipes 10 and 20
Is finely adjusted, so that the waveforms 10a, 10b, 20a, and 20b on the outer peripheral surfaces of the two-wave pipes are substantially continuous.

Next, with one end S1 of the first half-cylinder member 30 being located on the side where the other end T2 of the second half-cylinder member 40 is located,
The half-cylinder member 30 is arranged on the upper side of the double-waved pipe. Thereby, both ends S1 and T1 of the first half-cylinder member 30 coincide with both ends T2 and S2 of the second half-cylinder member 40 in the longitudinal direction of the corrugated tube, and the hook-shaped projections 36a to 36 of the first half-cylinder member 30
d faces the holes 47a to 47d of the second half-cylinder member 40, and the projections 46a to 46d of the second half-cylinder member 40 face the holes 37a to 37d of the first half-cylinder member 30, respectively. When the first half-cylinder member 30 is pressed against the corrugated pipes 10 and 20 and the second half-cylinder member 40, the inner peripheral surface of the first half-cylinder member 30 and the upper outer peripheral surface of the corrugated pipes 10 and 20 are separated. At the same time as the fitting starts, the holes 47a-4
The protrusions 36a to 36d of the first half-cylinder member 30 start to be inserted into 7d, and the protrusions 46a to 46d of the second half-cylinder member 40 start to be inserted into the holes 37a to 37d of the first half-cylinder member 30 at the same time.

When the first half-cylinder member 30 is pressed until the inner peripheral surface of the first half-cylinder member 30 and the outer peripheral surface of the corrugated pipe are completely fitted, as shown in FIG. The hook-shaped projections 36a to 36d of the member 30 are
47d, the engagement surface of the tip hook portion of the projection is locked to the outer surfaces of the extension portions 44 and 45 of the member 40, and at the same time, the second
The hook-shaped projections 46a to 46d of the half-cylinder member 40 pass through the holes 37a to 37d of the first half-cylinder member 30, and the engagement surfaces of the hooks at the distal end of the projections extend from the extension portion 34 of the first half-cylinder member 30, 35 is locked to the outer surface. As a result, the two half-cylinder members 30 and 40 are connected to each other. As a result, the corrugated tubes 10 and 20 have the waveforms 10a, 10b, 20a and 20b on the outer peripheral surface of the corrugated tubes.
Are complementary waveforms 33 on the inner peripheral surfaces of both half-cylinder members 30, 40.
a, 34b, 43a, 43b and are firmly connected to each other by the joints 30, 40.

[Embodiment 2] Next, a joint for a tube with a spiral wave according to a second embodiment of the present invention will be described with reference to FIGS. The joint of this embodiment has basically the same configuration, operation and effect as those of the first embodiment, and the elements corresponding to the elements of the first embodiment are indicated by the corresponding reference numerals (for example, the first embodiment). The first half-cylinder member of the second embodiment corresponding to the first half-cylinder member 30 of the example is denoted by reference numeral 130), and detailed description of various joint elements is omitted.

However, in the first embodiment, the half cylindrical members 30, 4
The hook-shaped projections 36a to the extension portions 34, 35, 44, 45
36d, 46a-46d and holes 37a-37d, 47
Compared with the case where a to 47d are formed as an engaging portion and an engaged portion, the joint of this embodiment is different in the configuration of the engaging portion and the engaged portion.

That is, as shown in FIGS. 7 and 8, the first extension portion 134 of the first half-cylinder member 130 of the pipe joint extends along the outer edge from the vicinity of the center transverse section P11 of the member 130 to the same member 130. And a hook-shaped ridge 136a as an engaging portion extending to one end S11 is formed integrally with the extended portion.
An outer edge of the first extension 134 opposite to the hook-shaped ridge 136a with respect to the center cross section P11 is formed as a flat ridge 137a as an engaged portion.
From the vicinity of the center cross section P11 to the other end T11 of the half cylindrical member 130
Extending to The second extension 1 of the half-cylinder member 130
35, a hook-shaped ridge 136b similar to the hook-shaped ridge 136a is formed on one end S11 side with respect to the center cross section P11.
On the other end T11 side, a flat ridge 1 similar to the flat ridge 137a
37b are formed.

Further, the second half-cylinder member 140 is
30 are formed in the same size and shape as
145, hook-shaped protrusions 146a and 146b are formed on one end S12 side with respect to the center transverse section P12, and flat protrusions 147a and 147b are formed on the other end T12 side.

The corrugated pipes 10 and 2 are
In the case where 0 is connected, when the connection side ends of the pipes with both waves are sandwiched from above and below by the half cylinder members 130 and 140, the waveforms of the inner peripheral surfaces of the first half cylinder member 130 and the second half cylinder member 140 become wavelike. The hooked ridges 136a and 136b are engaged with the corrugated pipes, and the flat ridges 147a and 147b
And the hook-shaped ridges 146a, 146
b engages the outer edges of the flat ridges 137a, 137b.
As a result, the two half-cylinder members 130 and 140 are connected to each other, and the corrugated tubes 10 and 20 are connected to each other.

[Embodiment 3] Next, a joint for a tube with a spiral wave according to a third embodiment of the present invention will be described with reference to FIGS. The joint of this embodiment has basically the same configuration, operation and effect as those of the second embodiment, and the corresponding elements are denoted by the same reference numerals and will not be described in detail. Compared with the joint of the second embodiment, the joint of the present embodiment has hook-shaped ridges and flat ridges formed at different positions.

That is, a hook-shaped ridge 236a is formed at one end S21 side with respect to the center transverse section P21 of the first half cylindrical member 230 at the first extension portion 234, and the other end T
A flat ridge 237a is formed on the 21 side. In the second extension portion 235 of the member 230, a flat ridge 237b is formed on one end S21 side with respect to the center cross section P21, and a hook-shaped ridge 236b is formed on the other end T21 side.

The second half-cylinder member 240 having the same size and shape as the first half-cylinder member 230 has a hook-shaped ridge 246a on one end S22 side of the first extension 244 with respect to the center transverse section P22.
Is formed, and a flat ridge 247a is formed on the other end T22 side. Also, the center cross section P22 of the second extension 245
A flat ridge 247b is formed on one end S22 side, and a hook-shaped ridge 246b is formed on the other end T22 side.

The corrugated pipes 10 and 2 are
0 is connected, as shown in FIG.
a and 236b engage with the outer edges of the flat ridges 247a and 247b, and the hook-shaped ridges 246a and 246b engage with the outer edges of the flat ridges 237a and 237b. As a result, the two half-cylinder members 130 and 140 are connected to each other, and the corrugated tubes 10 and 20 are connected to each other.

The corrugated pipe joint of the present invention is not limited to the first to third embodiments, and various modifications are possible. For example, in the above-described embodiment, the case where the present invention is applied to the joint of the tube with the spiral wave is described, but the present invention is also applicable to the joint of the tube with the independent waveform wave. in this case,
A waveform complementary to the waveform on the outer peripheral surface of the tube with the independent waveform wave is formed on the inner peripheral surface of the half-cylinder member. Further, in the embodiment, the joint which is suitable for the corrugated pipe having the circular cross section has been described. However, the present invention can be applied to the joint of the corrugated pipe having a circular cross section.

Further, in the present invention, the corresponding engagement portion and engaged portion of each half-cylinder member of the joint may be arranged symmetrically with respect to the center transverse section of the half-cylinder member. That is, when each half-cylinder member has two extended portions on both edges as in the above-described embodiment, the engaging portion and the engaged portion provided on each extended portion are positioned with respect to the center transverse section of the half-cylinder member. What is necessary is just to arrange symmetrically. Therefore, as in the case of the first embodiment, it is possible to provide only an engaging portion at one longitudinal end of the half-cylinder member and provide only an engaged portion at the other end side with respect to the center transverse section of the half-cylinder member. It is not essential, as in the third embodiment, at one extension of the half-cylinder member, an engaging portion is provided at one end side with respect to the center transverse section of the half-cylinder member, and an engaged portion is provided at the other end side. With respect to the extension portion, the engaged portion may be provided on one end side with respect to the center cross section, and the engaging portion may be provided on the other end side.

Therefore, for example, the engaging portion in the first embodiment
The arrangement of the engaged portions can be modified like the arrangement in the third embodiment. However, when the arrangement of the first embodiment in which all the engaging portions are provided at one end in the longitudinal direction of the half-cylinder member and all the engaged portions are provided at the other end thereof, two half-cylinder members are used. When combining the tubular members, there is an advantage that the two half tubular members naturally become a correct combination.

The number, shape, and the like of elements such as hook-shaped projections and holes forming the engaging portion and the engaged portion are not limited to those in the above-described embodiment, and various modifications are possible. Further, in the joint according to the second aspect, the engaging portion and the engaged portion may be constituted by components different from the main body. In the first to third embodiments, the half-cylinder member is made of a single material. However, the half-cylinder member is made of, for example, a hard material for the outer peripheral surface side and the engaging portion, the engaged portion, and the like. The side may be made of a soft material.

[0043]

As described above, according to the present invention, a corrugated pipe can be connected by combining two half-cylinder members having the same shape, so that the corrugated pipe can be connected easily and reliably. be able to. Further, since two half-cylinder members forming a pair can be manufactured with the same mold, there is an effect that the manufacturing cost of the pipe joint can be reduced.

[Brief description of the drawings]

FIG. 1 shows two half-cylinder members constituting a pipe joint of the present invention, in which (a) is in the same direction, (b) is in a state in which both ends are opposite to each other, and (c) is further. Explanatory drawing which shows the state which combined the inner peripheral surface facing.

FIG. 2 shows two half-cylinder members constituting a conventional pipe joint,
(A) is an explanatory view showing the same orientation, and (B) is an explanatory view showing a state in which the inner peripheral surfaces are combined to face each other.

FIG. 3 is an explanatory view when two half-cylinder members constituting another example of the pipe joint of the present invention are oriented in the same direction.

FIG. 4 is a development view showing a pipe joint according to an embodiment of the present invention together with a pipe with a spiral wave.

FIG. 5 is a transverse sectional view taken along line AA of FIG. 1;

FIG. 6 is a cross-sectional view showing a state in which a pipe with a spiral wave is connected by the pipe joint of FIG. 1;

FIG. 7 is a developed view showing a pipe joint according to another embodiment of the present invention, together with a pipe with a spiral wave.

FIG. 8 is a transverse sectional view taken along line BB of FIG. 7;

9 is a cross-sectional view showing a state in which a pipe with a spiral wave is connected by the pipe joint of FIG. 7;

FIG. 10 is a developed view showing a pipe joint according to still another embodiment of the present invention, together with a tube with a spiral wave.

FIG. 11 is a transverse sectional view taken along line CC of FIG. 10;

FIG. 12 is a cross-sectional view showing a state in which a pipe with a spiral wave is connected by the pipe joint of FIG. 10;

[Explanation of symbols]

 10, 20: Spiral wave tube 30: First half cylindrical member 33a: Wave peak 33b: Wave valley 36a, 36b, 36c, 36d: Hook-shaped protrusion 37a, 37b, 37c, 37d: Hole 40: Second half Cylinder member 43a: Wave peak 43b: Wave trough 46a, 46b, 46c, 46d: Hook-shaped projection 47a, 47b, 47c, 47d: Hole X: Longitudinal axis passing through the center in the circumferential direction of the half cylinder member P: Half Centers in the longitudinal direction of the tubular member P1, P2: cross sections passing through the longitudinal center P of the half tubular member

Claims (1)

(57) [Claims] 1. A first half-cylinder member for covering one half of a spiral corrugated tube connected to each other, and a second half-cylinder member for covering another one half of each spiral corrugated tube. When the first and second half cylinder members are combined, the waveform of the inner peripheral surface is
Spiral pipe fittings formed in a spiral shape
A is, on both sides of both sides of the side edges and a second half cylinder member of the first half cylinder member
Each of the side edges has both an engaging portion and an engaged portion, and the engaging portion and the engaged portion of each half-cylinder member pass through the longitudinal center P of the half-cylinder member and have a half cylinder shape. The first and second half-cylinder members are provided symmetrically with respect to a plane including a cross section of the member, and the first and second half-cylinder members are combined so that the directions of both ends thereof are opposite to each other and the inner peripheral surfaces thereof are opposed to each other to form the entire circumference of the corrugated tube. When the first and second half-cylinder members are combined so as to constitute the cylindrical member, the engaging portion of the first half-cylinder member is engaged with the engaged portion of the second half-cylinder member. A fitting for a corrugated pipe, wherein the fitting portion of the second half-cylinder member is engaged with the engaged portion of the first half-cylinder member.