JPH1144390A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily insert a pipe into a sleeve, make the pipe hard to be pulled out, easily perform connecting work, and confirm a pipe connecting condition later. SOLUTION: Slipping-out preventive tools 15 are arranged on both ends of a sleeve 13. The slipping-out preventive tools 15 are formed in an almost C shape having a circumferential length larger than the semicircumference of the sleeve 13 and a corrugated pipe 1, and have elasticity returnable to an original condition when external force is removed even if an interval between the circumferential directional both ends is opened by applying the external force. The outward projecting edges 17 on which the slipping-out preventive tools 15 are installed, are formed on an end part outer periphery of the sleeve 13, and the inward projecting edges 19 to engage with the outward projecting edges 17 of the sleeve 13 and inward projecting strips 21 falling in an outer peripheral valley part of the corrugated pipe 1, are formed on an inner periphery of the slipping-out preventive tools 15. The sleeve 13 is made transparent or translucent so that the corrugated pipe 1 inserted into it can be visually confirmed from outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint of the type in which an end of a pipe is inserted into a sleeve for connection.

[0002]

2. Description of the Related Art Conventionally, the following types of pipe joints are known. There is a stopper that determines the position of the tube inserted into the sleeve, an annular projection is formed on the outer periphery of the end of the sleeve, and an elastic U-shaped body with a claw projecting inward is fitted to this annular projection. . When the corrugated tube is inserted into the sleeve against the elasticity of the elastic U-shaped body, the claws fall into the valleys on the outer periphery of the corrugated tube due to the elasticity of the U-shaped body, and the corrugated tube cannot be pulled out (Japanese Utility Model Publication No. 2-31851). Gazette). There is a stopper that determines the position of the tube inserted into the sleeve, a through hole is formed at the end of the sleeve, the C-shaped connector is fitted over the stopper, and the claw projecting inward from the C-shaped connector is attached to the sleeve. One that protrudes from the inner peripheral surface of the sleeve through the through hole. When the corrugated tube is inserted into the sleeve against the elasticity of the C-shaped connector, the claws fall into the valleys on the outer periphery of the corrugated tube due to the elasticity of the C-shaped connector, and the corrugated tube cannot be pulled out (actual fairness 2).
-31852 publication). A corrugated pipe having a sleeve having an inner diameter through which the pipe can pass and having a gasket attached to the outer periphery of the end is inserted into this sleeve to provide watertightness (Japanese Utility Model Laid-Open No. 6-6229).
No. 1).

[0003]

In the pipe joint described above, the rigidity of the U-shaped body or the C-shaped coupling body must be reduced (easy to spread) in order to make it easier to insert the pipe into the sleeve. The corrugated tube becomes easy to pull out. Conversely, in order to make it difficult for the corrugated pipe to be pulled out of the sleeve, it is necessary to increase the rigidity of the U-shaped body or the C-shaped coupling body (it is difficult to spread), but this causes a problem that the pipe becomes difficult to insert. Therefore, it is difficult to easily insert the tube and make it difficult to pull out the tube.

In the above-mentioned pipe joint, if a corrugated pipe having a packing attached to the outer periphery of the end is to be inserted into the sleeve, the packing may come off or be damaged by the claws. Therefore, it is difficult to obtain a connection state with good watertightness.

[0005] Further, the above pipe joint is shown in FIG.
As shown in FIG. 12, since the stopper 2 for determining the position of the pipe end is provided in the sleeve 3, a state where the stopper cannot be moved in the axial direction (or a state where it is difficult to move) as shown in FIG.
When connecting the corrugated pipes 1 and 2, the end of one corrugated pipe 1 is inserted into the sleeve 3 and then the other corrugated pipe 1 is slacked in the middle as shown in FIG. It is necessary to bend and then insert the other end of the corrugated tube 1 into the sleeve 3 as shown in FIG. However, when the rigidity of the corrugated pipe is large, such as an underground conduit, or when the distance from the pipe end to the pipe fixing portion is small, the corrugated pipe 1 may be bent so that it can be slacked in the middle. Extremely difficult and requires intensive work.

In addition, since the above-mentioned pipe joint uses a sleeve through which the pipe can pass, unless the positional relationship between the pipe and the sleeve is sufficiently managed, the pipe end is inserted and connected to the sleeve. Or, it cannot be confirmed at which side of the sleeve the packing is located. In addition, the construction manager cannot check whether the pipes are correctly connected later, and there is a problem in reliability.

[0007] In view of the above problems, the first aspect of the present invention.
It is an object of the present invention to provide a pipe joint in which a pipe is hardly pulled out and a connection operation is easy. A second object of the present invention is to provide a pipe joint which can be connected without bending a pipe. A third object of the present invention is to provide a pipe joint capable of confirming a connection state of a pipe later.

[0008]

The pipe joint of the present invention is provided with a pipe stopper at the end of the sleeve (claim 1). The stopper is preferably configured as described below. It is desirable that the sleeve has an inside diameter that allows passage of the tube (claim 2). When connecting two pipes in such a fitting, the sleeve is first placed over one of the pipes, then the end of the other pipe is brought closer, and then about half of the sleeve is moved to the other pipe side. Then, by attaching the stopper and fixing the tube and the sleeve, a tube which is difficult to move in the axial direction can be easily connected.

The stopper in the pipe joint according to the present invention is an arc type having a circumference longer than a half circumference of the sleeve and the pipe. The distance between both ends in the circumferential direction is increased by applying an external force to the distance between the sleeve and the pipe. It is also preferable that the elastic member has elasticity enough to return to the original state when the external force is removed (claim 3). This allows the stopper to be attached across the sleeve and the tube after the tube is inserted into the sleeve, thereby facilitating the operation of connecting the tubes.

[0010] In the pipe joint of the present invention, when the pipe to be connected is a corrugated pipe, an outwardly projecting rim to which the stopper is attached is formed on the outer periphery of the end of the sleeve. It is preferable that the inner periphery of the stopper has an inward projection engaging with the outward projection of the sleeve and an inward projection which falls into a valley on the outer periphery of the corrugated tube. (Claim 4). In this way, after inserting the corrugated tube into the sleeve, it is possible to prevent the corrugated tube from being easily pulled out simply by attaching the stopper to the sleeve and the corrugated tube. It becomes possible.

At both ends in the circumferential direction of the stopper, guide notches are formed between the inward projection and the inward projection and into which the outward projection of the sleeve can enter. It is better to set it (claim 5). With this configuration, when the stopper is pushed in, the direction is guided by the guide notch and the outwardly projecting edge, so that the stopper is not detached and is easily attached.

It is preferable that the stopper in the pipe joint of the present invention be movable relative to the sleeve in the axial direction of the sleeve within a range of less than one pitch of the waveform of the corrugated pipe. Claim 6). In this way, even when the inward projection of the stopper comes into contact with the ridge on the outer periphery of the corrugated tube when the stopper is attached across the sleeve and the corrugated tube, the stopper is removed. The inward ridge can be dropped into the valley on the outer periphery of the corrugated pipe only by slightly shifting it in the axial direction. Therefore, the requirement for the positioning accuracy of the tube and the sleeve during the connection operation can be greatly reduced.

[0013] Further, the stopper in the pipe joint of the present invention is preferably configured such that chamfered portions are formed at both ends in the circumferential direction of the inward ridge formed on the inner periphery thereof. ). Providing the chamfered portion in this manner makes it difficult for the stopper to be caught by the pipe, so that the stopper can be attached smoothly. Also, especially when the pipe is a spiral corrugated pipe, the trough of the pipe extends diagonally to the mounting direction of the stopper, and the stopper is attached across the sleeve and the corrugated pipe. When doing, a very large pushing force is required because the stopper moves diagonally, but if the above chamfered part is formed, it should be attached with a relatively small pushing force. Becomes possible.

In the pipe joint according to the present invention, the stopper is formed such that an inner diameter of a portion to be attached to the sleeve is smaller than an outer diameter of a portion to which the stopper of the sleeve is attached.
Thereby, it is preferable that the retaining member tightens the sleeve when the retaining member is attached to the end of the sleeve (claim 8). By doing so, it is possible to prevent the stopper from rotating and catching foreign matter such as sand between the sleeve and the sleeve, and the connection state can be stably maintained.

Further, the pipe joint of the present invention further comprises a sub-arc-type retaining aid for complementing the circumferential missing portion of the arc-type retaining device, wherein the retaining device and the retaining device are respectively provided. It is preferable to have a configuration having connecting portions with the other party at both ends in the circumferential direction (claim 9). When the ends of the retaining device are connected with the retaining aid in this way,
Since it is difficult for both ends of the stopper to open, the pull-out strength of the tube is greatly improved.

Preferably, the connecting portions at both ends of the retaining member are T-shaped concave portions, and the connecting portions at both ends of the retaining aid are T-shaped convex portions fitted into the T-shaped concave portions.
0). Thereby, high connection strength can be obtained with a simple structure. Further, both the T-shaped concave portion and the notch portion for guide can be provided without difficulty. Further, the elastic deformation of the T-shaped protrusion allows smooth engagement with the T-shaped recess.

When the T-shaped concave portion and the T-shaped convex portion are engaged with each other and the stopper is connected to the retaining aid,
It is preferable that a gap is formed between the back wall of the mold concave portion and the tip end surface of the T-shaped convex portion so that a gap into which a minus screwdriver can enter is formed. In this way, when it is necessary to release the connection after connecting the retaining member and the retaining aid, when the T-shaped convex portion is scooped up by inserting a flathead screwdriver into the gap, the connection can be easily performed. Can be canceled.

It is preferable that the retaining aid has the same sectional shape as that of the retaining member except for the connecting portion. Thereby, the pull-out strength of the tube can be further increased.

The sleeve in the pipe joint of the present invention is
The inner diameter of the middle part is the size that the packing mounted on the outer circumference of the pipe is in close contact with, and the inner diameter of the sleeve end is tapered so that the inner diameter gradually increases as it approaches the open end. It is preferable to perform (claim 11). This makes it easy to insert the end of the tube with the packing attached into the sleeve.

In the pipe joint of the present invention, it is preferable that at least a part of the sleeve can be visually recognized from the outside through the peripheral wall (claim 12). This makes it possible to confirm the position of the pipe end or the position of the packing in the sleeve after connection. To make the inside of the sleeve visible from the outside through the peripheral wall of the sleeve, the entire sleeve or a part of the sleeve along the axial direction may be formed of a transparent or translucent material.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIGS. 1 to 3 show a first embodiment of the present invention. The pipe joint 11 includes a sleeve 13 and stoppers 15 attached to both ends thereof. The tubes 1 and 1 to be connected are corrugated tubes having an annular waveform.

The sleeve 13 has an outwardly projecting edge 1 on the outer periphery of both ends.
7. The inner diameter of the intermediate portion of the sleeve 13 is such that the packing 5 mounted on the outer periphery of the corrugated tube 1 is in close contact, and the inner peripheral surfaces of both ends of the sleeve 13 gradually increase in diameter as approaching the open end. (The inner diameter of the open end is larger than the outer diameter of the packing 5). The corrugated tube 1 on which the packing 5 is mounted is the sleeve 1
3 can be passed through. Also sleeve 13
Is entirely made of transparent or translucent plastic so that the corrugated tube 1 and the packing 5 inserted therein can be visually recognized from the outside. The sleeve 13 can be manufactured by, for example, blow molding of high-density polyethylene.

The retaining member 15 is in the form of a superior arc having a circumference longer than half the circumference of the sleeve 13 and the corrugated tube 1. It is preferable that the peripheral length of the stopper 15 be 200 ° to 260 ° as the central angle θ as shown in FIG. The outer protruding edge 1 of the sleeve 13 is provided on the inner periphery of the stopper 15.
An inward ridge 19 that engages with the ridge 7 and an inward ridge 21 that falls into a valley on the outer periphery of the corrugated tube 1 are formed.
In this embodiment, the stopper 15 has an elasticity enough to return to the original state when the external force is removed even when the external space is removed by applying an external force to the space between both ends in the circumferential direction to open the space between the sleeve 13 and the corrugated tubes 1, 1. Have. Such a stopper 15 can be manufactured by, for example, injection molding of ABS resin, polypropylene, or polyamide.

As shown in FIG. 1, the stopper 15 is attached to the end of the sleeve 13 so that the outward projection 17 is located between the inward projection 19 and the inward projection 21. . The distance between the inward projection 19 and the inward projection 21 is the outward projection 17.
The thickness of the stopper 1
Numeral 5 is movable in the axial direction of the sleeve 13 within a range smaller than one pitch of the waveform of the corrugated tubes 1 and 1.

As shown in FIG. 2, the retaining member 15 has an inner diameter (2R ₁ ) of a portion mounted on the sleeve 13 in a state where no external force is applied, and the retaining member 15 of the sleeve 13
It is preferable that the outer diameter is slightly smaller than the outer diameter (2R ₂ ) of the portion to which is attached. As a result, when the stopper 15 is attached to the end of the sleeve 13, the stopper 13 is in a state of tightening the sleeve 13.
The risk of biting foreign matter such as sand between 3 is reduced,
The connection status becomes stable.

Next, a method of connecting the corrugated pipes 1 and 1 with the pipe joint 11 configured as described above will be described. First, as shown in FIG. 3, the corrugated tube 1 with the packing 5 attached to the outer periphery is inserted from one end side of the sleeve 13. Sleeve 1
Since the inner circumference of the end portion 3 is a tapered surface 18 (see FIG. 1), this insertion work is easy. When the end of the corrugated pipe 1 is positioned substantially at the center of the sleeve 13, the packing 5 is pressed by the inner peripheral surface of the sleeve 13 and
3 and the corrugated tube 1. Corrugated tube 1
Since the sleeve 13 is transparent or translucent, whether or not has been inserted to a predetermined position can be visually recognized from the outside.

When the corrugated tube 1 is set at a predetermined position, the stopper 15 is arranged as shown in FIG. At this time, the inward ridge 19 and the inward ridge 2
In order to make sure that the outwardly projecting edge 17 of the sleeve 13 is inserted into the groove between the grooves 1 and that the position is not shifted when the sleeve 13 is pushed in, the stoppers 15 correspond to the grooves at both circumferential ends. In addition, it is desirable to form a cutout portion 23 into which the outwardly projecting edge 17 of the sleeve 13 enters. When both ends of the inward projection 21 hit the ridges of the corrugated tube 1 when the retaining device 15 starts to be pushed, the inward projection is moved slightly by moving the retaining device 15 in the axial direction. Both ends of 21 can be matched to the valleys of the corrugated tube 1.

When the stopper 15 is pushed in the direction of arrow A, both ends of the stopper 15 in the circumferential direction are
After spreading to the outer diameter of the corrugated tube 3 and the corrugated tube 1 once, they are restored to the original state by the elasticity of the stopper 15 itself. With this, the inward ridge 21 is the corrugated tube 1
Of the corrugated pipe 1, and the stopper 15 holds the sleeve 13 and the corrugated pipe 1.
Connection is terminated. The connection of the other corrugated tube 1 can be performed in the same manner as described above. While the stopper 15 is pushed in, the outwardly protruding edge 17 of the sleeve 13 enters the notch 23 of the stopper 15 and guides the same.
Does not come off the outwardly projecting edge 17 of the sleeve 13.

The pipe joint 11 is provided with a stopper 15 after the corrugated pipe 1 is inserted into the sleeve 13 and the corrugated pipe 1 is attached thereto.
Is fixed to the sleeve 13 so that the corrugated pipe 1
Is inserted, the packing 5 is not damaged even if the packing 5 is attached to the outer periphery of the corrugated pipe 1. In addition, the pipe joint 11 cannot insert the corrugated pipe 1 into the sleeve 13 when the stopper 15 is attached to the end of the sleeve 13. In other words, it is not necessary to consider the ease of insertion of the corrugated pipe 1 in a state where the stopper 15 is attached to the sleeve 13, so that it is easy to design so that the corrugated pipe 1 can be firmly fixed.

Further, in this pipe joint 11, since the packing 5 in the pipe 13 can be visually recognized through the peripheral wall of the sleeve 13, it is determined whether or not the two corrugated pipes 1, 1 are connected at the center of the sleeve 13. That is, the person in charge can easily visually inspect whether or not the sleeve 13 straddles the two corrugated pipes 1 and 1 almost evenly after the construction is completed, and the reliability of the construction can be guaranteed.

Since the pipe joint 11 has the above-described structure, it is easy to connect a corrugated pipe that cannot move in the axial direction. Figure 4 shows the connection method in that case.
(A) to (D). That is, when connecting the corrugated pipes 1 and 1 that cannot be moved in the axial direction as shown in (A), first, as shown in (B), one corrugated pipe 1 is bent and the other corrugated pipe 1 is bent. The sleeve 13 is inserted through the tube 1. Since a large force is not required to deflect the corrugated tube 1, the operation is much easier than in the case where the corrugated tube 1 is bent so that it can be slacked in the middle as shown in FIG. Next, after returning the other corrugated tube 1 to a state without bending, the sleeve 13 is pulled back so as to straddle the ends of the corrugated tubes 1 and 1 as shown in FIG. Thereafter, the stoppers 15 may be attached to both ends of the sleeve 13 as shown in FIG.
Such an advantage is also preferable when connecting a heavy flexible tube in a wound state.

[Embodiment 2] FIG. 5 shows a second embodiment of the present invention. The pipe joint 11 connects the corrugated pipe 1 and the bell mouth 25. The sleeve 13 of the pipe joint 11 has an insertion portion of the corrugated pipe 1 on one end side and a bell mouth 25 integrally formed on the other end side. The sleeve 13 is transparent or translucent, the sleeve 13 has an outwardly projecting edge 17 at the insertion end of the corrugated tube, and the stopper 13 is attached with the corrugated tube 1 inserted into the sleeve 13. This embodiment is the same as the first embodiment in that the stopper 15 has an inwardly projecting edge and an inwardly projecting ridge.

[Embodiment 3] FIGS. 6 and 7 show a third embodiment of the present invention. This pipe joint 11 is for connecting the corrugated pipes 1 having a spiral waveform. The configuration of the sleeve 13 of the pipe joint 11 is the same as that of the first embodiment. The point that this pipe joint 11 is different from that of the first embodiment is that an inward ridge 21 that falls into a valley of the corrugated pipe 1.
Are formed in the spiral direction in accordance with the valleys of the corrugated tube 1. The other parts are the same as in the first embodiment, and the same parts are denoted by the same reference numerals.

When the pipes 1 and 1 with spiral waves are connected in a watertight manner by the pipe joint 11, it is necessary to mount a packing 5 on the outer circumference of the pipes 1 and 1 with spiral waves as in the first embodiment. In this case, the packing 5 needs to continuously cover the valleys and peaks of the waveform over one pitch or more.

The method of connecting the tubes with spiral waves 1 and 1 is the same as in the first embodiment. However, in the case of a tube with a spiral wave,
At the beginning of mounting the stopper 15, the inward ridge 21
Even if the circumferential end of the groove is aligned with the valley of the corrugated tube 1, the retaining member 15 is also pushed obliquely because the valley extends obliquely with respect to the pushing direction. For this reason, a strong pushing force is required. In order to improve the workability by reducing the pushing force at this time, it is effective to form chamfers 27 at both ends in the circumferential direction of the inward projection 21 as shown in FIG. is there.

[Embodiment 4] FIGS. 8 and 9 show a fourth embodiment of the present invention. 8 and 9, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. This embodiment is different from the first embodiment in that a sub-arc-type retaining aid 2 for complementing the missing portion of the circumference of the superior-arc-type retaining member 15.
9 is used. Each of the retaining member 15 and the retaining auxiliary member 29 has a connecting portion with a counterpart at both ends in the circumferential direction. In this embodiment, a T-shaped concave portion (a concave portion having a larger width at the back) 31 is formed as a connecting portion at both ends of the stopper 15 as shown in FIGS. 9 (A) and 9 (B). As shown in FIGS. 3C and 3D, T-shaped protrusions (protrusions having a wider end) are formed at both ends of 29. The T-shaped protrusion 33 is sized to fit into the T-shaped recess 31.

When the T-shaped concave portion 31 and the T-shaped convex portion 33 are fitted to each other and the retaining member 15 and the retaining auxiliary member 31 are connected, an annular shape is formed, as shown in FIG. 13 covers the entire circumference. The retainer 29 has the same radius of curvature as the retainer 15 attached to the sleeve 13 when no external force is applied.

The use of the retaining aid 31 is as follows. First, as shown in FIG. 8, the stopper 15 is attached so as to straddle the end of the sleeve 13 and the outer periphery of the corrugated tube 1. The mounting method is the same as that of the first embodiment. after this,
One of the T-shaped protrusions 33 of the retaining aid 31 is fitted into one of the T-shaped recesses 31 of the stopper 15, and then the other T-shaped convex 33 of the retaining aid 31 is connected to the stopper 15. What is necessary is just to fit in the other T-shaped recessed part 31.

When the ends of the stopper 15 are connected by the stopper 31 in this manner, the pull-out strength of the corrugated tube 1 is greatly improved. The reason is as follows.
That is, in a state where there is no retaining aid 31 (the state shown in FIG. 1), when a strong pulling force is applied to the corrugated tube 1, the interval between both ends of the retaining member 15 gradually increases, and the corrugated tube 1 is pulled. When the corrugated tube 1 is applied with a strong pulling force, both ends of the retainer 15 are difficult to open in a state where both ends of the retainer 15 are connected by the retainer aids 31. For this reason, the pull-out strength is greatly improved. According to the prototype test, it was confirmed that when the retaining aid 31 was attached, the pull-out strength was improved about four times as compared with the case where it was not attached.

Note that the retaining aid 31 is a retaining device 1.
5 is required to be slightly elastically deformed when it is connected, so that the same Young's modulus as the stopper 15 (10000 kgf / c
It is preferably formed of a plastic material having a m ^{2 to} 35000 kgf / cm ² ).

Further, the retaining aid 31 is provided with the inward protruding edge 1.
9 and an inwardly projecting ridge 21, and the cross-sectional shape other than the connecting portions at both ends is the same as that of the stopper 15. This is to improve the pull-out strength as much as possible. However, the retaining aid may have a different cross-sectional shape from that of the retaining aid (for example, the inward projection 19 and the inward projection 21 may be omitted). If the retaining aid has a structure that connects both ends of the retaining tool, it has an effect of improving the pull-out strength.

The T-shaped concave portion 31 and the T-shaped convex portion 33 are
As shown, the retaining device 15 and the retaining aid 2
It is effective to increase the pull-out strength of the corrugated tube by forming the corrugated tube at a position deviated from the central portion in the axial direction toward the inward protruding edge 19 (sleeve 13 side) from the central portion in the axial direction.

The T-shaped concave portion 31 and the T-shaped convex portion 33 are engaged with each other when the retaining member 15 and the retaining auxiliary member 29 are connected to each other as shown in FIG. It is preferable to form a gap G between the rear wall and the tip end surface of the T-shaped projection 33 so that a minus driver can be inserted. In this way, when it becomes necessary to release the connection between the retaining member 15 and the retaining assisting device 29, the connection can be easily performed by inserting a flathead screwdriver into the gap G and scooping up the T-shaped convex portion 33. Can be canceled.

[Fifth Embodiment] FIG. 10 shows a fifth embodiment of the present invention. 10, the same parts as those in FIG. 8 are denoted by the same reference numerals. This embodiment differs from the fourth embodiment in that a stopper 35 is formed on the inner surface of the sleeve 13 at the center in the axial direction so that the end of the corrugated tube 1 abuts. The present invention is also applicable to the type of pipe joint having the stopper 35 in the sleeve 13 as described above. In this example, the packing 5 has an inner diameter reaching the bottom of the trough of the corrugated tube 1 and has a thin and long triangular cross section.

[Other Embodiments] In the first and second embodiments, the case where the inward projection 21 of the stopper 15 is not chamfered has been described. It is preferable that the inward protrusion 21 of the stopper 15 of the first and second embodiments be chamfered. In the first and third embodiments, the case where the packing 5 is attached to the outer periphery of the corrugated pipe 1 to obtain a connection state of a watertight structure has been described. However, when watertightness is not required, the packing is not required.
Alternatively, the inner peripheral surface of the sleeve may be straightened without the tapered surface 18 on the inner peripheral surface at both ends of the sleeve 13.

FIG. 11 shows an embodiment in which the circumference of the stopper 15 is set to a half circumference (semicircle). Stopper 1
5 is formed into a semicircle, a T-shaped concave portion 31 is formed at one end thereof, and a T-shaped convex portion 33 is formed at the other end.
The two stoppers 15 can be used to cover the entire circumference of the sleeve and the corrugated tube. Reference numeral 19 denotes an inward protrusion engaging with the outward protrusion 17 of the sleeve 13 (see FIG. 1), and reference numeral 21 denotes an inward protrusion which falls into a valley on the outer periphery of the corrugated tube 1.

[0047]

As described above, the use of the pipe joint according to the present invention makes it difficult for the pipe after connection to be pulled out,
Connection work can be easily performed. In addition, if a pipe joint that allows the inside of the sleeve to be visually recognized is used, the position of the pipe in the sleeve can be confirmed from the outside when connecting the pipe and after the connection, so that a highly reliable connection state is guaranteed. be able to.

[Brief description of the drawings]

FIG. 1 is a partially cut-away side view showing a first embodiment of a pipe joint according to the present invention.

FIG. 2A is a front view of a half-cut of a stopper, and FIG. 2B is a front view of a half-cut of a sleeve.

FIG. 3 is a partially cut-away side view showing a pipe connection method using the pipe joint of FIG. 1;

4 (A) to 4 (D) are explanatory views showing a method of connecting a pipe which cannot be moved in the axial direction by the pipe joint of FIG. 1;

FIG. 5 is a partially cutaway side view showing a second embodiment of the pipe joint according to the present invention.

FIG. 6 is a partially cutaway side view showing a third embodiment of the pipe joint according to the present invention.

7A is a front view of a stopper, and FIG. 7B is a front view of a half-cut sleeve.

FIG. 8 is a partially cutaway side view showing a fourth embodiment of the pipe joint according to the present invention.

9A is a half-cut front view of a retaining device, FIG. 9B is a side view of the same, FIG. 8C is a half-cut front view of a retaining aid, and FIG. FIG.

FIG. 10 is a partially cutaway side view showing a fifth embodiment of the pipe joint according to the present invention.

11A and 11B show another embodiment of the stopper used for the pipe joint of the present invention, wherein FIG. 11A is a half-cut front view, and FIG.
Is a right side view, and (C) is a left side view.

12 (A) to 12 (C) are explanatory views showing a connection method of a pipe which cannot be moved in an axial direction by a conventional pipe joint.

[Explanation of symbols]

 1: Corrugated pipe 5: Packing 11: Fitting 13: Sleeve 15: Retaining member 17: Outward ridge 19: Inward ridge 21: Inward ridge 23: Notch 27: Chamfered part 29: Retainer Auxiliary tool 31: T-shaped concave part 33: T-shaped convex part

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 22, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

When the T-shaped concave portion 31 and the T-shaped convex portion 33 are fitted to each other and the retaining member 15 and the retaining auxiliary member 29 are connected to each other, they form an annular shape, as shown in FIG. 13 covers the entire circumference. The retainer 29 has the same radius of curvature as the retainer 15 attached to the sleeve 13 when no external force is applied.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

The usage of the retaining aid 29 is as follows. First, as shown in FIG. 8, the stopper 15 is attached so as to straddle the end of the sleeve 13 and the outer periphery of the corrugated tube 1. The mounting method is the same as that of the first embodiment. after this,
Retaining one of the T-shaped convex portion 33 is fitted to one of the T-type recess 31 of the stopper 15 coming off aid 29, and then exits retaining the other T-shaped convex portion 33 of the aid 29 of stop 15 What is necessary is just to fit in the other T-shaped recessed part 31.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction contents]

When the ends of the stopper 15 are connected by the stopper 29 in this manner, the pull-out strength of the corrugated tube 1 is greatly improved. The reason is as follows.
That is, in a state where the retaining stopper 29 is not provided (the state shown in FIG. 1), when a strong pulling force is applied to the corrugated tube 1, the gap between both ends of the corrugated stopper 15 gradually increases and the corrugated tube 1 is pulled. Although the detachment occurs, in a state where both ends of the stopper 15 are connected by the retaining aid 29 , both ends of the stopper 15 are difficult to open even when a strong pulling force is applied to the corrugated tube 1. For this reason, the pull-out strength is greatly improved. According to the trial production test, it was confirmed that when the retaining aid 29 was attached, the pull-out strength was improved about four times as compared with the case where it was not attached.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

Note that the retaining aid 29 is a retaining device 1.
5 is required to be slightly elastically deformed when it is connected, so that the same Young's modulus as the stopper 15 (10000 kgf / c
It is preferably formed of a plastic material having a m ^{2 to} 35000 kgf / cm ² ).

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

Further, the retaining aid 29 is provided with the inward protruding edge 1.
9 and an inwardly projecting ridge 21, and the cross-sectional shape other than the connecting portions at both ends is the same as that of the stopper 15. This is to improve the pull-out strength as much as possible. However, the retaining aid may have a different cross-sectional shape from that of the retaining aid (for example, the inward projection 19 and the inward projection 21 may be omitted). If the retaining aid has a structure that connects both ends of the retaining tool, it has an effect of improving the pull-out strength.

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidemi Nishiyama 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Takashi Kinoshita 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (12)

[Claims] A pipe joint having a sleeve (13) into which a pipe (1) to be connected is inserted.
A pipe joint characterized in that a pipe stopper (15) is provided at the end of (3). 2. The pipe joint according to claim 1, wherein the sleeve has an inner diameter through which the pipe can pass. The stopper (15) is provided on the sleeve (13).
And an arc type having a circumference longer than a half circumference of the pipe (1). Even if the gap between both ends in the circumferential direction is increased to an interval where the sleeve and the pipe enter by applying an external force, only the original state is restored when the external force is removed. It has elasticity, so that the stopper (15) can be attached across the sleeve (13) and the tube (1) after the tube (1) is inserted into the sleeve (13). The pipe joint according to claim 1, wherein: 4. A pipe (1) to be connected is a corrugated pipe, and said stopper (15) is provided on an outer periphery of an end of a sleeve (13).
An outwardly projecting edge (17) is formed on the inner periphery of the stopper (15), and an inwardly projecting edge (19) engaging with the outwardly projecting edge (17) of the sleeve (13). ) And an inward ridge (21) which falls into a valley on the outer periphery of the corrugated pipe (1).
The pipe joint according to claim 3, wherein 5. A stopper (15) is located between the inwardly projecting edge (19) and the inwardly projecting ridge (21) at both ends in the circumferential direction, and the outwardly projecting projection of the sleeve (13). 5. The pipe joint according to claim 4, wherein a notch (23) for the guide is formed in which the edge (17) can enter. 6. The stopper (15) is movable relative to the sleeve (13) in the axial direction of the sleeve (13) within a range smaller than one pitch of the waveform of the corrugated tube (1). The pipe joint according to claim 4 or 5, wherein: 7. An inward ridge (21) formed on a retaining member (15) having chamfers (27) formed at both circumferential ends. The pipe joint according to any one of the above. 8. An inner diameter of a portion of the stopper (15) to be attached to the sleeve (13) is formed smaller than an outer diameter of a portion of the sleeve (13) to which the stopper (15) is attached. The stopper (15) with the sleeve (13)
8. The pipe joint according to claim 3, wherein the stopper (15) tightens the sleeve (13) when the sleeve (13) is attached to the end of the pipe joint. 9. A sub-arc-type retaining aid (29) for complementing a missing circular part of the superior arc-type retaining member (15), wherein the retaining member (15) and the retaining auxiliary ( 29)
The pipe joint according to any one of claims 3 to 8, wherein each has a connecting portion with a counterpart at both ends in a circumferential direction. 10. The connecting portion at both ends of the stopper (15) is T
10. The mold recess (31), wherein the connecting portions at both ends of the retaining aid (29) are T-shaped protrusions (33) fitted into the T-shaped recess (31). Pipe fittings. 11. The inner diameter of the intermediate portion of the sleeve (13) is such that the packing (5) mounted on the outer periphery of the tube (1) is in close contact with the inner surface of the end of the sleeve (13). The pipe joint according to any one of claims 1 to 12, wherein the pipe joint has a tapered surface (18) whose inner diameter gradually increases toward the open end. 12. The pipe joint according to claim 1, wherein at least a part of the sleeve (13) is made visible from the outside through the peripheral wall.