JPH11351475A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint wherein a pipe is less prone to be pulled out, and connecting operations are simply performable. SOLUTION: This pipe joint comprises a sleeve 13 wherein a pipe 1 to be connected is inserted, and an antislip device 15 to be installed in a range astride the sleeve 13 and the pipe 1. This sleeve 13 is provided with an outward projecting edge 17 on the double end circumference. The antislip device 15 consists of a superior circular member 15A and an inferior circular member 15B. Both these superior and inferior circular members 15A and 15B are provided with the outward projecting edge 17 of the sleeve 13, two inward projecting edges 21 being hitched on with each other in the axial direction, and two inward projecting bars 23 falling in a circumferential root part of the pipe 1, respectively. The superior circular member 15A has a T-type recess 25A at both ends while the inferior circular member 15B has a T-type salient 25B being fitted in the T-type recess 25A at both the ends. In addition, the inferior circular member 15B has a projecting piece 27 projecting in the circumferential direction at both the ends, while the superior cicular member 15A has a notch, where this projecting piece 27 comes in, at both the ends likewise.

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).

[0003] In the above-mentioned pipe joint, however, it is necessary to reduce the rigidity of the U-shaped body or the C-shaped coupling body (easy to spread) in order to make it easy to insert the pipe into the sleeve. It becomes easy to come off, and the corrugated tube becomes easy to pull out. Conversely, in order to make it difficult for the corrugated pipe to be pulled out from the sleeve, it is necessary to increase the rigidity of the U-shaped body or the C-shaped coupling body and to firmly fit (make it hard to spread). Problem. Therefore, it is difficult to easily insert the tube and make it difficult to pull out the tube.

[0004]

In order to solve such a problem and to provide a pipe joint in which the pipe is hard to be pulled out and the connection work can be easily performed, the present inventors have first shown in FIG. 10 and FIG. (Japanese Patent Application No. 10-30078). The pipe joint 11 has a sleeve 13 into which the corrugated pipe 1 to be connected is inserted.
And a stopper 15 which is attached across the outer periphery of the end of the sleeve 13 and the outer periphery of the corrugated tube 1 near the end of the sleeve 13.

[0005] The sleeve 13 has an outwardly projecting edge 17 on the outer periphery of both ends.
And a stopper 19 for the corrugated pipe 1 on the inner periphery of the central portion (the stopper 19 may not be provided). The stopper 15 includes an arc-shaped member 15A having a circumference longer than a half circumference of the sleeve 13 and the corrugated tube 1, and an arc-shaped member 15A.
And an inferior arc-shaped member 15B that complements the circumferential missing portion.

The arc-shaped member 15A and the arc-shaped member 15B are provided on the inner circumference with an inward projection 21 which is axially hooked to the outward projection 17 of the sleeve 13, and a valley on the outer circumference of the corrugated tube 1. Inwardly protruding ridges 23 which are hooked in the axial direction with respect to the falling pipe 1 in the portion. In this embodiment, the arc-shaped member 15A has elasticity enough to return to the original state when the external force is removed even if the distance between both ends is increased to the distance into which the sleeve 13 and the corrugated tube 1 enter by applying an external force. .

[0007] Also, a superior arc-shaped member 15A and a subarc-shaped member 15B
Have concave and convex connecting portions 25A and 25B which can be inserted and removed in the radial direction and are hooked to each other in the circumferential direction. In this example, the connecting portions 25A at both ends of the arc-shaped member 15A are T
A concave portion (a concave portion having a larger width at the back) is formed as a concave portion, and connecting portions 25B at both ends of the inferior arc-shaped member 15B are T-shaped convex portions (a convex portion having a wider tip portion) fitted into the T-shaped concave portion. Department).

The inner diameter of the intermediate portion of the sleeve 13 is sized to be in close contact with the packing 3 mounted on the outer periphery of the corrugated tube 1 in order to maintain waterproofness. The inner peripheral surfaces at both ends of the sleeve 13 are tapered so that the inner diameter gradually increases toward the open end in order to facilitate insertion of the corrugated tube 1.

The use of the pipe joint 11 makes it possible to easily connect the corrugated pipes 1 and 1 as follows. First, the corrugated tube 1 with the packing 3 attached to the outer periphery is inserted from one end side of the sleeve 13 until the distal end abuts against the stopper 19. Next, the arc-shaped member 15A is arranged so that both ends in the circumferential direction straddle the outer periphery of the end of the sleeve 13 and the outer periphery of the corrugated tube 1, and then the arc-shaped member 15A is moved to the diameter of the sleeve 13. Push in the direction.

Then, the arc-shaped member 15A has sleeves at both ends.
After expanding to 13 and the outer diameter of the corrugated tube 1, the arc-shaped member
15A is restored to its original state by its own elasticity, and the sleeve 13 and the corrugated tube 1 are held. In this state, the inward protruding edge 21 of the arc-shaped member 15A and the outward protruding edge 17 of the sleeve 13 are hooked to each other in the axial direction, and the arc-shaped member 15A
Of the corrugated pipe 1 falls into the valley of the corrugated pipe 1 and is caught in the axial direction with respect to the pipe 1, so that one corrugated pipe 1 cannot be pulled out of the sleeve 13.

Thereafter, one T-shaped projection of the subarc-shaped member 15B is formed.
25B is fitted into one T-shaped recess 25A of the arc-shaped member 15A, and the other T-shaped projection 25B of the arc-shaped member 15B is fitted into the other T-shaped recess 25A of the arc-shaped member 15A. . As a result, the superior arc-shaped member 15A and the inferior arc-shaped member 15B are annularly connected, and the connection of one of the corrugated tubes 1 to the sleeve 13 is completed. The connection of the other corrugated tube 1 is performed in the same manner.

When the both ends of the arc-shaped member 15A are connected by the arc-shaped member 15B as described above, the pull-out strength of the corrugated tube 1 is greatly improved. The reason is as follows. That is, in the case where only the arcuate member 15A is used, when a strong pulling force is applied to the corrugated tube 1, the gap between both ends of the arcuate member 15A gradually increases, and the corrugated tube 1 is pulled out. When both ends of the arcuate member 15A are connected by the arcuate member 15B, even if a strong pulling force is applied to the corrugated tube 1, both ends of the arcuate member 15A are difficult to open, so that the pullout strength is reduced. It is greatly improved. According to the prototype test,
It was confirmed that when the arc-shaped member 15B was attached, the pull-out strength was improved about four times as compared with the case where it was not attached. When the pipe joint 11 shown in FIGS. 10 and 12 is used, a connection portion of the corrugated pipe 1 having a high pull-out strength can be obtained.

[0013]

However, when the connection performance of the pipe joint was further checked, when a strong bending stress was applied to the pipe joint 11 and the corrugated pipes 1 and 1 in the vicinity thereof, the arc-shaped member 15A was connected. It has been found that the connection with the arc-shaped member 15B may come off, and a strong connection state may not be maintained. The cause is considered as follows.

That is, the T-shaped projection 25B of the subarc-shaped member 15B
Are connected to each other in the circumferential direction, but are relatively displaceable in the radial direction. On the other hand, when the pipe joint 11 and the corrugated pipes 1 and 1 in the vicinity thereof are strongly bent, a compressive stress acts on the inside of the bend and a tensile stress acts on the outside as shown in FIG. A complex stress distribution with different directions is obtained. For this reason, uneven deformation tends to occur in each member. As a result, the T-shaped recess 25A or T
When a stress is generated that displaces the mold projection 25B from the inside to the outside, a relative displacement occurs in the radial direction between the T-shaped recess 25A and the T-shaped projection 25B, and the connecting portion is disengaged. .

[0015]

SUMMARY OF THE INVENTION Based on the results of these studies, the present invention provides a pipe joint which can maintain a strong connection state even with bending. A sleeve to be inserted and a stopper engaging the outer periphery of the end of the sleeve and the outer periphery of the tube near the end of the sleeve, wherein the stopper has a perimeter greater than half the circumference of the sleeve and the tube. And an arc-shaped member that complements a circumferentially missing portion of the arc-shaped member. At least the former of the arc-shaped member and the arc-shaped member has an inner periphery and an axis line with respect to the sleeve. Direction, and a portion that engages in the axial direction with respect to the tube, and the arc-shaped member can be expanded by applying external force to increase the interval between both ends to the interval into which the sleeve and the tube enter. Remove external force It has elasticity enough to return to, the superior arc-shaped member and the inferior arc-shaped member have concave and convex connection portions that can be inserted and removed in the radial direction and are hooked to each other in the circumferential direction at both ends, Further, the superior arc-shaped member and the inferior arc-shaped member at both ends, when the connecting portions of both are connected to each other,
It is characterized in that the connecting portion has a radial displacement preventing portion for preventing relative displacement in the radial direction (claim 1).

In this pipe joint, by providing the above-mentioned radial stopper, it is possible to prevent the connection between the arc-shaped member and the arc-shaped member from being disconnected when the connecting portion of the pipe is bent. Things.

Further, the pipe joint of the present invention comprises a sleeve into which a pipe to be connected is inserted, and a stopper which engages with the outer periphery of the end of the sleeve and the outer periphery of the pipe near the end of the sleeve. The arc-shaped member having a circumference greater than half the circumference of the sleeve and the tube; and a subarc-shaped member that supplements a circumferentially missing portion of the arc-shaped member. At least the former of the members has, on the inner periphery, a portion that is axially hooked to the sleeve and a portion that is axially hooked to the tube, and the arc-shaped member has an external force. In addition, even if the distance between both ends is increased to a distance into which the sleeve and the tube can be inserted, if the external force is removed, it has elasticity enough to return to the original state. Can be inserted and removed in the direction It may have a concavo-convex type connecting portion, and the arc-shaped member and the arc-shaped member may have a circumferentially extending groove for mounting a fastening member on the outer periphery. (Claim 2).

In this pipe joint, the arc-shaped member and the arc-shaped member are connected to each other, and a clamping member such as a metal band is attached to a groove on the outer periphery thereof and tightened. Is prevented from being disconnected.

The pipe joint of the present invention can be configured to combine the above two configurations (claim 3).

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIGS. 1 to 5 show a first embodiment of the present invention. 1 to 5, the same parts as those in FIGS. 10 and 11 described above are denoted by the same reference numerals.

This pipe joint 11 is different from those shown in FIGS. 10 and 11 in that, as shown in FIGS.
At both ends of B, protruding pieces 27 projecting in the circumferential direction on the inner peripheral side from the T-shaped convex portion 25B are formed, and at both ends of the arc-shaped member 15A, on the inner peripheral side from the T-shaped concave portion 25A. The notch 29 into which the protruding piece 27 enters is formed. The protruding piece 27 of the arc-shaped member 15B is formed on the inner peripheral side of the inward ridge 23 of the arc-shaped member 15B that falls into the valley of the pipe 1. Arc-shaped member 15
The notch 29 of A is the arcuate member 15 that falls into the valley of the pipe 1.
The inwardly projecting ridge 23 of FIG.

The projecting piece 27 and the notch 29 are formed by the arc-shaped member 15.
4A, the protruding piece 27 enters the cutout portion 29 as shown in FIG. 4B, and the T-shaped projection in the connected state. The portion 25B and the T-shaped concave portion 25A are prevented from relatively shifting in the radial direction. Thus the protruding piece 27
The corner 27a on the outer peripheral end of the tip of the protruding piece 27 is chamfered into a curved surface so that the work for engaging the notch 29 with the notch 29 can be performed smoothly. In addition, a curved chamfer is also applied to a corner 29 a of the notch 29 on the outer peripheral side of the entrance. The configuration other than the above is the same as the pipe joint shown in FIGS. 10 and 11.

The sleeve 13 is preferably formed entirely of a 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 circumferential length of the arc-shaped member 15A is 2 at the central angle θ.
It is preferable to be 00 ° to 260 °. It is preferable that the arc-shaped member 15A be formed such that the inner diameter of the portion mounted on the sleeve 13 in a state where no external force is applied is slightly smaller than the outer diameter of the portion of the sleeve 13 on which the arc-shaped member 15A is mounted. Thereby, when the superior arc-shaped member 15A is attached to the end of the sleeve 13, the sleeve 13 is tightened, so that the connection state is stabilized.

On the other hand, the subarc-shaped member 15B is attached to the sleeve 13 when no external force is applied to the subarc-shaped member 15B.
Preferably, the radius of curvature is the same as 15A. Arc-shaped member
15A and the subarc-shaped member 15B can be manufactured by, for example, injection molding of ABS resin, polypropylene, or polyamide.

FIGS. 5A to 5C show a procedure for connecting the corrugated pipes 1 and 1 using the pipe joint 11 of this embodiment. FIG. 5A shows that one (left) corrugated tube 1 is inserted into the sleeve 13 and the arcuate member 15A and the subarc-shaped member 15B are attached to complete the connection of the corrugated tube 1. The other (right) corrugated tube 1 is to be inserted into the sleeve 13. Then, after inserting the other corrugated tube 1 into the sleeve 13, FIG.
As shown in (B), the arc-shaped member 15A is mounted so as to straddle the outer periphery of the end of the sleeve 13 and the outer periphery of the corrugated tube 1. This mounting can be performed simply by pushing both ends of the arc-shaped member 15A over the outer periphery of the end of the sleeve 13 and the outer periphery of the corrugated tube 1 and pushing in the radial direction of the sleeve 13.

Thus, the arcuate member 15A holds the sleeve 13 and the corrugated tube 1, and the inwardly projecting edge of the arcuate member 15A.
Since the outwardly projecting edge 17 of the sleeve 13 and the outwardly projecting edge 17 of the sleeve 13 are axially hooked to each other, and the inwardly projecting ridge 23 of the arcuate member 15A falls into the valley of the corrugated tube 1, the corrugated tube 1 is
Cannot be pulled out of

Thereafter, as shown in FIG.
B, and a T-shaped projection 25B at one end of the subarc-shaped member 15B.
Is fitted into the T-shaped recess 25A at one end of the superior arc-shaped member 15A as shown in FIG.
The mold projection 25B is fitted into the T-shaped recess 25A at the other end of the arc-shaped member 15A as shown in FIG. In some cases, it is smoother to perform these fittings simultaneously at both ends. This is the arc-shaped member 15A
And the inferior arc-shaped member 15B are connected in a ring shape, and a connection state as shown in FIG. 1 is obtained.

In the connection state shown in FIG. 1, first, the outwardly projecting edge 17 of the sleeve 13 and the inwardly projecting edges 21 of the arc-shaped member 15A and the arc-shaped member 15B are mutually caught in the axial direction to form an arc-shaped member. Since the inward ridges 23 of the member 15A and the arc-shaped member 15B fall into the valley of the corrugated tube 1, the corrugated tube 1 is prevented from being pulled out. Second, since both ends of the arcuate member 15A are connected by the inferior arcuate member 15B, both ends of the arcuate member 15A are difficult to open even if a strong pulling force is applied to the corrugated tube 1.
For this reason, the pull-out strength of the corrugated tube 1 is greatly improved.
Third, the protruding pieces 27 at both ends of the inferior arc-shaped member 15B are
The T-shaped recesses which enter the notches 29 at both ends of A and are connected
25A and the T-shaped recess 25B are prevented from shifting in the radial direction. For this reason, even if the connection portion is forcibly bent, the T-shaped concave portion 25A and the T-shaped concave portion 25B do not come off, and the connection state can be stably maintained.

[Embodiment 2] FIGS. 6 and 7 show a second embodiment of the present invention. This pipe joint 11 is different from that of the first embodiment in that the protruding piece 27 and the notch 29 in the first embodiment are omitted, and the superior arc-shaped member 15A and the inferior arc-shaped member 15 are provided.
Circumferentially extending groove 31 for attaching a tightening band to the outer periphery of B
Is formed.

After connecting the corrugated pipes 1 and 1 in the same manner as the pipe joint of the first embodiment, the pipe joint 11 is provided with a groove 31 on the outer periphery of the connected arcuate member 15A and subarc member 15B. A steel band 33 is wound along and tightened to prevent radial displacement of the T-shaped concave portion 25A and the T-shaped convex portion 25B when the connecting portion is bent. Other configurations, methods of use, and operational effects are the same as those of the first embodiment, and the same portions are denoted by the same reference characters and description thereof will be omitted.

[Embodiment 3] FIGS. 8 and 9 show a third embodiment of the present invention. This pipe joint 11 is a combination of the first and second embodiments. That is, the subarc-shaped member 15
B, protruding pieces 27 are provided at both ends, and notches 29 are provided at both ends of the arc-shaped member 15A.
A groove 31 for mounting a tightening band is formed on the outer periphery of 15B. Other configurations, usage methods, and operational effects are the same as those of the first and second embodiments, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

[Other Embodiments] The present invention relates to a sleeve 13
The engagement of the stopper 15 with the tube and the tube 1 can also be applied to a structure different from the above embodiment. For example, real fair 2-
As disclosed in Japanese Patent Publication No. 31852, a through hole is formed in the sleeve 13, and a claw that protrudes inward through the through hole and is provided on the stopper 15 is provided at the valley portion of the tube 1. The present invention can also be applied to a joint that connects to a pipe by engaging with a pipe.

[0034]

As described above, in the pipe joint according to the present invention, the pipe can be easily connected, the pull-out strength of the pipe after connection is extremely high, and the pipe joint is bent. Has an effect that the connection state can be maintained stably.

[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. 2 (A) is a view of a stopper for the pipe joint of FIG. 1;
Is a side view, and (B) is a partially cutaway front view.

FIG. 3 is a perspective view showing a connecting portion of the stopper of FIG. 2;

FIGS. 4A and 4B are front views showing a procedure for connecting the stoppers of FIG. 2;

5 (A) to 5 (C) are partially cutaway side views showing a procedure for connecting a corrugated pipe using the pipe joint of FIG. 1;

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

FIG. 7 (A) is a view of the stopper for the pipe joint of FIG. 6;
Is a side view, and (B) is a partially cutaway front view.

FIG. 8 is a partially cut-away side view showing a third embodiment of the pipe joint according to the present invention.

FIG. 9 (A) of the stopper for the pipe joint of FIG. 8;
Is a side view, and (B) is a partially cutaway front view.

FIG. 10 is a partially cut-away side view of a pipe joint on which the present invention is based.

11 (A) of the stopper for the pipe joint of FIG. 10
Is a half-cut front view, and (B) is a side view.

FIG. 12 is an explanatory diagram of stress generated when a pipe is bent.

[Explanation of symbols]

 1: corrugated pipe 3: packing 11: fitting 13: sleeve 15: stopper 15A: arc-shaped member 15B: arc-shaped member 17: outward projection 21: inward projection 23: inward projection 25A: T-shaped concave 25B: T-shaped convex 27: protruding piece 29: notch 31: groove 33: band

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

Claims (5)

[Claims] A sleeve (13) into which a pipe (1) to be connected is inserted, and a stopper which engages the outer circumference of the end of the sleeve (13) and the outer circumference of the pipe (1) near the sleeve end. 15), wherein the stopper (15) is an arc-shaped member (15) having a circumference longer than half the circumference of the sleeve (13) and the pipe (1).
A) and an inferior arc-shaped member (15B) that complements the circumferential missing portion of the arc-shaped member (15A), and at least one of the arc-shaped member (15A) and the arc-shaped member (15B). The former has a portion (21) axially hooked to the sleeve (13) and a portion (23) axially hooked to the pipe (1) on the inner periphery. The arcuate member (15A) has elasticity enough to return to the original state if the external force is removed, even if the distance between the both ends is increased to the distance where the sleeve (13) and the tube (1) enter by applying an external force. The arc-shaped member (15A) and the arc-shaped member (15B) have concave and convex connecting portions (25A, 25B) at both ends which can be inserted and removed in the radial direction and are hooked to each other in the circumferential direction. In addition, the arc-shaped member (15A) and the arc-shaped member (15B) are connected to both ends by connecting portions (25 , 25B) have radial displacement preventing portions (27, 29) that prevent the connecting portions (25A, 25B) from relatively displacing in the radial direction when they are coupled to each other. Characteristic pipe joint. 2. A sleeve (13) into which the pipe (1) to be connected is inserted, and a stopper (3) which engages with the outer circumference of the end of the sleeve (13) and the outer circumference of the pipe (1) near the sleeve end. 15), wherein the stopper (15) is an arc-shaped member (15) having a circumference longer than half the circumference of the sleeve (13) and the pipe (1).
A) and an inferior arc-shaped member (15B) that complements the circumferential missing portion of the arc-shaped member (15A), and at least one of the arc-shaped member (15A) and the arc-shaped member (15B). The former has a portion (21) axially hooked to the sleeve (13) and a portion (23) axially hooked to the pipe (1) on the inner periphery. The arcuate member (15A) has elasticity enough to return to the original state if the external force is removed, even if the distance between the both ends is increased to the distance where the sleeve (13) and the tube (1) enter by applying an external force. The arc-shaped member (15A) and the arc-shaped member (15B) have concave and convex connecting portions (25A, 25B) at both ends which can be inserted and removed in the radial direction and are hooked to each other in the circumferential direction. Further, the arc-shaped member (15A) and the arc-shaped member (15B) are provided on the outer periphery with a tightening member (33). It has a groove (31) extending in the circumferential direction for mounting, pipe joint, characterized in that. 3. An arc-shaped member (15A) and a sub-arc-shaped member (15A).
2. The pipe joint according to claim 1, wherein B) has a circumferentially extending groove (31) for mounting the fastening member (33) on the outer periphery. 4. A connecting portion (25) at both ends of the arcuate member (15A).
A) is a T-shaped concave portion, and the connecting portions (25B) at both ends of the arc-shaped member (15B) are T-shaped convex portions fitted into the T-shaped concave portion. The pipe joint according to any one of the above. 5. A connecting portion at both ends of the superior arc-shaped member (15A) is a T-shaped recess (25A), and a connecting portion at both ends of the inferior arc-shaped member (15B) is fitted into the T-shaped recess (25A). T-shaped convex part (25B)
And the radial stoppers at both ends of the arc-shaped member (15B) are projecting pieces (27) formed to project inward from the T-shaped projection (25B) in the circumferential direction, Arc-shaped member (15
The radial stoppers at both ends of A) are the T-shaped recesses (25A)
The pipe joint according to claim 1 or 3, wherein the notch (29) is formed on the inner peripheral side and into which the protruding piece (27) enters.