JPH0926070A - Pipe with joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe with joint which facilitates the pipe connection work, can be connected firmly, and allows the adjustment of the length of the pipe. SOLUTION: It is a pipe with joint in which a joint planned part 100 is integrally formed at least in a part of a pipe P, and a male joint section 10 and a female joint section 20 are formed in the joint planned part 100. As for the male joint section 10, a first engaging section 11 is formed on an outer peripheral surface at a tip thereof which opposes substantially to the circumferential direction of the pipe P, and a first tapered surface 12 is formed on an outer peripheral surface at a basic end thereof. As for the female joint section 20, a second tapered surface 22 which can come into contact with the first tapered surface 12 at least at three sections in the circumferential direction of the pipe P is formed on an inner circumferential surface at a tip thereof, and a second engaging section 21 which can be engaged with the first engaging section 11 is formed on a basic end side of the second tapered surface 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to corrugated pipes and straight pipes used for cable protection pipes and the like, and more particularly to a pipe with a joint having a joint structure at predetermined intervals.

[0002]

2. Description of the Related Art As a corrugated pipe that is generally used as a cable protection pipe, a pipe having an annular concavo-convex shape and a pipe having a spiral concavo-convex shape have been known. Further, as a straight pipe generally used as a cable protection pipe, pipes made of various materials such as metal pipes and PVC pipes are known.

In this type of cable protection pipe, as a joint-integrated pipe in which a joint is formed on the pipe itself, for example, a corrugated pipe with a joint disclosed in Japanese Patent Application Laid-Open No. 2-240,494 is known. An insertion port is formed at one end of the tube, and a receiving port is formed at the other end. Then, the pipes are connected to each other by engaging an insertion port formed at one end of one pipe with a receiving port formed at one end of the other pipe.

[0004]

However, although the corrugated pipe with a joint has a structure that allows one-touch connection, when the insertion opening is pushed into the receiving opening, the projection on the inner peripheral surface of the receiving opening is inserted by the insertion opening. Since it is necessary to widen in the direction, if the joint portion has a large wall thickness, a large force is required for connection, especially in a low temperature environment, and there is a problem that workability is extremely poor. On the contrary, if the wall thickness around the protrusions is thin, cracks may occur when the protrusions are radially expanded, especially in a low temperature environment. Further, in the cable protection tube, it is necessary to remove the joint portion connected when repairing the cable, etc., but the corrugated tube has a problem that the workability of removal is poor.

In addition to such a problem, in the conventional pipe with a joint, since the joints are formed only at both ends of the pipe, a pipe having a length necessary for the construction site is prepared in advance. I had to leave. That is, it was not possible to manufacture a pipe with a joint having a required length on the spot depending on the situation of the construction site.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a joint that enables easy connection work, can be firmly connected, and can adjust the length of the pipe. Intended to provide a tube.

[0007]

In order to achieve the above object, the pipe with a joint of the present invention is cut at intervals along the longitudinal direction of the pipe so that the open end becomes a male joint portion. A first engaging portion formed at two tip-side outer peripheral surfaces facing each other by approximately 180 ° in the circumferential direction of the pipe. , A first tapered surface formed on the outer peripheral surface on the base end side, the female joint portion is formed on the inner peripheral surface on the front end side, and the first tapered surface is at least 3 in the circumferential direction of the pipe. It has a 2nd taper surface which can contact | abut at a location, and a 2nd engagement part formed in the base end side of the said 2nd taper surface and which can be engaged with the said 1st engagement part.

In the pipe with a joint of the present invention, a cable or the like is inserted into the pipe, but the pipe is cut according to the use condition to form a male joint portion and a female joint portion, so that the joint is integrated at the end portion. It can be used as a tube formed in. That is,
When the pipe is cut at the male joint part and the female joint part, one pipe becomes a pipe with a male joint part integrally formed at the tip, and the other pipe has a female joint part integrally formed at the tip. Becomes In this case, the first engaging portion is formed on the outer peripheral surface of the distal end of the male joint portion, while the second engaging member engageable with the first engaging portion is formed on the inner peripheral surface of the female joint portion. A joint is formed. Therefore, when the male joint portion formed at the tip of one pipe is inserted into the female joint portion formed at the tip of the other pipe, the first engaging portion and the second engaging portion engage with each other, Both pipes can be connected.

At this time, in the present invention, since the first engaging portion of the male joint portion is formed at a position opposed to the circumferential direction of the pipe by approximately 180 °, the male joint portion is made to be the female joint portion. Upon insertion, it is preferable that the first engaging portion of the male joint portion is inserted so as to pass through the major axis of the ellipse in a state where the tip of the female joint portion is deformed to have an elliptical cross section. This is because the first engaging portion smoothly passes through the second engaging portion, and the insertion workability is significantly improved.

When the male joint portion is inserted into the female joint portion, the grip of the female joint portion is released to firmly engage the first engaging portion and the second engaging portion. At this time, in the present invention, the first tapered surface is formed on the outer peripheral surface of the base end of the male joint portion, and the second inner surface of the female joint portion that can contact the first tapered surface is formed. Since the tapered surface is formed, the first and second tapered surfaces come into contact with each other, and thereafter, the elliptical deformation of the female joint portion is prevented. Therefore, the engagement between the first engaging portion and the second engaging portion becomes stronger and the disengagement can be prevented. At the same time, the axial centers of both pipes coincide with each other, and rattling at the joint can be prevented.

In the present invention, it is preferable that the first taper surface and the second taper surface can be brought into contact with each other at least at three positions in the circumferential direction of the pipe, particularly at equal intervals in the circumferential direction. First
By setting the contact points of the second taper surface to at least three points, the cross section of the female joint section becomes a perfect circle, whereby the engagement of the first and second engaging sections becomes stronger. is there. Therefore, it is most preferable that the first tapered surface and the second tapered surface are in contact with each other over the entire circumference.

In the present invention, the outer diameter of the first engaging portion is provided at the position on the base end side of the second tapered surface of the female joint portion, which is in phase with the second engaging portion by about 90 °. It is more preferable to form the cut groove portion having an inner diameter that is substantially equal to or larger than that. If the cutout groove is formed, the male joint portion and the female joint portion can be easily removed by relatively rotating both joint portions by approximately 90 ° in the repair work of the cable or the like.

Further, according to the present invention, by forming the male joint portion and the female joint portion having the above-mentioned structures in the pipe at a predetermined interval, a pipe with a joint having a required length depending on the situation of the construction site. Can be made on the spot. Therefore, it is possible to provide a pipe whose length can be adjusted on the spot without preparing a plurality of types of pipes having a required length at the construction site or preliminarily preparing them.

In the present invention, the portion other than the joint portion may be a corrugated pipe or a straight pipe. In the present invention, the male joint portion and the female joint portion are provided via the planned cutting portion,
It is good to set it as a joint planned part. It suffices that at least the male joint portion and the female joint portion are formed in the planned joint portion, and for example, a connecting portion may be formed between the male joint portion and the female joint portion. At this time, it is particularly preferable to form the connecting portion in a corrugated manner to make it flexible so as to be used as a pipe without cutting the planned joint portion.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view showing a pipe with a joint according to an embodiment of the present invention, FIGS. 2 and 3 are perspective views showing a state in which the pipe with a joint according to the embodiment of the present invention is cut, and FIG. Sectional drawing which shows the state which cut | disconnected the pipe with a joint which is embodiment of invention, FIG. 5 shows the state which connected the male joint part and the female joint part after cutting the pipe with a joint which is embodiment of this invention, and It is sectional drawing which shows the state at the time of removal.

First, in the pipe P with a joint according to the present embodiment, as shown in FIG.
Is formed. The planned joint portions 100 are formed on the pipe P at predetermined equal intervals or unequal intervals. In use, this joint planned part 100 may be cut and used as a joint, or may be used as a part of the pipe P as it is. The pipe portion 200 may be a corrugated pipe having annular irregularities or spiral irregularities, or may be a straight pipe as it is. Further, the pipe P can be formed of metal or plastic such as PVC, and it is more preferable that the pipe P be formed by using an elastic material.

The joint portion 100 has a male joint portion 10 and a female joint portion 20 formed on both sides of the joint portion 30. The male joint portion 10 has a tip portion having a diameter smaller than that of the pipe portion 200, and a portion connecting the tip portion and the pipe portion 200, and the outer peripheral surface of the tip portion is circumferentially arranged. The first engaging portions 11 are formed at positions facing each other by approximately 180 °. In the present embodiment, the first engaging portion 11 is composed of a protrusion protruding outward, and the first engaging portion 1
1 is formed with a phase of about 180 °. However,
The first engaging portion 11 in the present invention is not limited to the protrusion. Further, one of the first engaging portions 11 in the present embodiment may be a continuous protrusion or an intermittent protrusion. A first tapered surface 12 is formed between the tip portion of the male joint portion 10 and the pipe portion 200, and a stopper surface 13 is formed with a step. The first tapered surface 12 formed on the male joint portion 10 is
The size is such that it comes into contact with the second tapered surface 22 formed on the inner peripheral surface of the female joint portion 20 described later. Further, the stopper surface 13 abuts on the tip end edge of the female joint portion 20 and controls the positioning function when the male joint portion 10 and the female joint portion 20 are connected. In this example, the stopper surface 13 is provided over the entire circumference, but it may be provided intermittently in the circumferential direction. In this case, it is desirable to provide the stopper surface 13 at three equally divided portions in the circumferential direction.

The female joint portion 20 in the present embodiment is formed such that its open end is expanded in diameter so that the tip end of the male joint portion 10 described above is inserted, and the inner peripheral surface of the male joint portion 10 is formed.
A second tapered surface 22 is formed on which the first tapered surface 12 comes into contact. Further, a second engaging portion 21 with which the first engaging portion 11 of the male joint portion 10 can engage is formed on the base end side of the second tapered surface 22. This second engaging portion 21
Is formed all around.

On the rear end side of the second taper surface 22, the inner diameter of the first engagement portion 11 is approximately 90 ° in the circumferential direction, and the inner diameter thereof is the outer diameter of the first engagement portion 11. And the same or more than the above-mentioned groove 23 is formed. When the male joint portion 10 and the female joint portion 20 are connected to each other, when the joint portions 10 and 20 are relatively rotated by approximately 90 °, the first engaging portion 11 of the male joint portion 10 causes the female joint portion to move. It is adapted to be located in the punched groove portion 23 of 20. In this way,
Both joints 1 by pulling out both joints 10 and 20
The engagement of 0 and 20 can be easily released.

An annular convex portion 24 and an annular concave portion 25 are formed at the base end of the female joint portion 20 in order to increase the rigidity of the female joint portion 20. The annular recess 25 is the male joint portion 10.
It also has the function of preventing excessive intrusion. Also, a connecting portion 30 formed between the male joint portion 10 and the female joint portion 20.
Is provided for connecting these because the tip diameter of the male joint portion 10 is smaller than the tip diameter of the female joint portion 20,
In the present invention, there is no problem even if the connecting portion 30 is omitted. On the contrary, when the connecting portion 30 is formed between the male joint portion 10 and the female joint portion 20, the connecting portion 30 may be formed in a wavy shape. By doing so, when the planned joint portion 100 is used as a part of the pipe P, the flexible function of the connecting portion 3 is exerted, so that the pipe P becomes more preferable.

Next, the operation will be described. In the pipe P with a joint according to the present embodiment, the joint planned part 100 is formed in the pipe at a predetermined interval, and the joint planned part 100 is used as it is as a part of the pipe P without being cut. In addition, it can be used to cut the joint planned portion 100 and connect it to another pipe P.

In this case, the positions L ₁ and L ₂ shown in FIG.
The planned joint portion 100 is cut with, and the joint portion 30 is discarded.
When the planned joint portion 100 is cut at the positions L ₁ and L ₂ , one pipe P becomes a pipe having a male joint portion 10 at its tip and can be connected to another pipe P having a female joint portion 20 at its tip. .
Further, since the other pipe P that has been cut is a pipe having the female joint portion 20 at the tip, it can be connected to another pipe P having the male joint portion 10 at the tip.

When connecting the male joint portion 10 and the female joint portion 20, as shown in FIGS. 2 to 4, the male joint portion 1 is connected.
No. 1 first engaging portion 11 and female engaging portion 20 second engaging portion 2
The phases of the joint portions 10 and 20 in the circumferential direction are adjusted so that the joint portions 1 and 1 can be engaged with each other. In this state, the male joint portion 10 is inserted into the female joint portion 20, but in order to facilitate the engagement between the first engaging portion 11 and the second engaging portion 21, the female joint portion 20 is inserted.
The female joint portion 20 is gripped in advance so that the opposing position where the second engaging portion 21 is formed has an elliptical major axis.
The tip may be deformed to have an elliptical cross section. As a result, the distance between the facing second engaging portions 21 becomes larger than the distance between the facing first engaging portions 11, so that the male joint portion 10 can be easily inserted into the female joint portion 20. You can

When the tip end edge of the female joint portion 20 comes into contact with the stopper surface 13 of the male joint portion 10, the female joint portion 20 is released to release the elliptical deformation. As a result, as shown in the upper half of FIG. 5, the first engaging portion 11 of the male joint portion 10 is moved to the female joint portion 2.
The second engaging portion 21 of 0 will be engaged. Simultaneously with this engagement, the first tapered surface 12 of the male joint portion 10 comes into contact with the second tapered surface 22 of the female joint portion 20, so that in addition to the elastic return of the pipe itself, the first tapered surface The female joint portion 20 is also affected by the force of 12 pressing the second tapered surface 22.
The cross section of the tip of will return to a perfect circle. Thereby, the engagement between the first and second engaging portions 11 and 21 becomes stronger. Moreover, as shown in the upper half of FIG.
When the first tapered surface 12 of 0 and the second tapered surface 22 of the female joint portion 20 abut on the entire circumference, both joint portions 10,
20 rattling can be prevented.

As described above, a plurality of pipes P can be connected by cutting the joint planned portion 100. However, depending on the situation such as when some pipes P are to be taken out, the joint portion 10 once connected can be obtained. Sometimes, I want to remove 20. In such a case, since the first engaging portion 11 of the male joint portion 10 and the second engaging portion 21 of the female joint portion 20 are firmly engaged with each other, they cannot be pulled out as they are. However, for example, one of the tube portions 200 is cut to make the tip portion rotatable, and this is rotated by about 90 °. Then, as shown in the lower half of FIG. 5, the engagement of the first and second engaging portions 11 and 21 which has been engaged until then is released, and the first engaging portion 11 is connected to the female joint. It will be located in the cutout groove portion 23 of the portion 20. Therefore, when both joint portions 10 and 20 are pulled out at this position, the engagement of the joint portions can be easily released. When connecting the pipes, the first engaging portion 11 of the male joint portion 10 and the cutout groove portion 23 of the female joint portion 20 are fitted to each other and then fitted together, and then the male joint portion 10 side is rotated. It seems to be good, but it is very difficult to rotate the long pipe P. Therefore, the connection work according to the above procedure is realistic.

Next, a method of manufacturing the above-mentioned pipe with a joint will be described. FIG. 6 is a schematic diagram for explaining a method for manufacturing the pipe P with a joint which is an embodiment of the present invention. The pipe P with a joint according to the present embodiment is a molding machine 52 for extruding a parison 51, which is the original shape of the pipe, and a molding die 53 for molding the parison 51 extruded from the molding machine 52 into a predetermined corrugated pipe P. , 54 can be manufactured by the blow molding method. The molding dies 53 and 54 are the parison 51.
The first die 53 and the second die 54 are continuously conveyed by the caterpillar 55 so as to sandwich them. The first and second molding dies 53 and 54 include dies 53a and 54a for molding the corrugated pipe section 200 and dies 53b and 54b for molding the above-described joint planned portion 100 at predetermined intervals.
There is. When the first and second molding dies 53 and 54 sandwich the parison 51, the space formed thereby is evacuated, whereby the parison 51 expands and the first and second molding dies 53 and 54 are expanded. Is shaped according to the inner peripheral surface of the.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention.
For example, the manufacturing method shown in FIG. 6 is an embodiment for manufacturing the pipe with a joint of the present invention, and can be manufactured by other methods.

[0028]

As described above, according to the present invention, it is possible to provide a pipe with a joint in which the connecting work can be easily performed, the connection can be made firmly, and the length of the pipe can be adjusted. .

[Brief description of drawings]

FIG. 1 is a half sectional view showing a pipe with a joint which is an embodiment of the present invention.

FIG. 2 is a perspective view showing a cut state of a pipe with a joint which is an embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which a pipe with a joint, which is an embodiment of the present invention, is cut.

FIG. 4 is a cross-sectional view showing a state in which a pipe with a joint, which is an embodiment of the present invention, is cut.

FIG. 5 is a cross-sectional view showing a state in which the male joint portion and the female joint portion are connected and disconnected after cutting the pipe with a joint according to the embodiment of the present invention.

FIG. 6 is a schematic diagram for explaining a method for manufacturing a pipe with a joint which is an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Male joint part 11 ... 1st engaging part 12 ... 1st taper surface 13 ... Stopper surface 20 ... Female joint part 21 ... 2nd engaging part 22 ... 2nd taper surface 23 ... Ditch | groove part 30 ... with connecting portions 100 ... joint 200 ... pipe portion P ... joint pipe L _1, L ₂ ... cutting portion

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[Procedure amendment]

[Submission date] August 3, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 4

FIG.

[Fig. 2]

[Figure 5]

[Figure 3]

FIG. 6

Claims (1)

[Claims] 1. A pipe (P) is cut at intervals along a longitudinal direction thereof so that the open end becomes a male joint part (10) and the open end becomes a female joint part (20). And a male joint portion (10) having a diameter of about 18 in the circumferential direction of the pipe (P).
A female joint portion having a first engagement portion (11) formed at two locations on the tip side outer circumferential surface facing each other at 0 ° and a first taper surface (12) formed on the base end side outer circumferential surface. (20) is formed on the inner peripheral surface on the distal end side, and the first tapered surface (12) is capable of contacting at least three circumferential positions of the pipe (P). )
And a second engaging portion (21) formed on the base end side of the second tapered surface (22) and capable of engaging with the first engaging portion (11). And a pipe with a fitting.