JP3682372B2 - Pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint of a type in which an end portion of a pipe is inserted into a sleeve and connected.
[0002]
[Prior art]
The following are known as this type of pipe joint.
1) There is a stopper that determines the position of the tube to be inserted into the sleeve. An annular protrusion is formed on the outer periphery of the end of this sleeve, and an elastic U-shaped body with claws protruding inward is fitted into this annular protrusion. What you did. When the corrugated tube is inserted into the sleeve against the elasticity of the elastic U-shaped body, the claw falls into the valley of the outer periphery of the corrugated tube due to the elasticity of the U-shaped body, and the corrugated tube cannot be pulled out (No. 2-31851) Publication).
2) There is a stopper that determines the position of the tube to be inserted into the sleeve, a through hole is formed at the end of the sleeve, and a C-type coupling body is externally fitted, and a claw projecting inwardly to the C-type coupling body Projecting to 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 connecting body, the claw falls into the valley of the outer periphery of the corrugated tube due to the elasticity of the C-shaped connecting body, and the corrugated tube cannot be pulled out (actual fairness 2 -31852 gazette).
[0003]
However, in the above-described pipe joints 1) and 2) , in order to make it easy to insert the pipe into the sleeve, it is necessary to reduce the rigidity of the U-shaped body or the C-type coupling body (easy to spread). Is easily removed, and the corrugated tube is easily pulled out. On the other hand, in order to make it difficult to pull out the corrugated tube from the sleeve, it is necessary to increase the rigidity of the U-shaped body or the C-shaped coupling body so that it is firmly fitted (hard to spread), but this makes it difficult to insert the tube. There is a problem of becoming. Therefore, it is difficult to make the tube easy to insert and difficult to pull out.
[0004]
[Problems to be solved by the invention]
In order to solve such problems, and to provide a pipe joint in which the pipe is difficult to pull out and can be easily connected, the present inventors previously proposed a pipe joint as shown in FIGS. 10 and 11. (Japanese Patent Application No. 10-30078). The pipe joint 11 includes a sleeve 13 into which the corrugated pipe 1 to be connected is inserted, an end outer periphery of the sleeve 13, and a retainer 15 attached across the outer periphery of the corrugated pipe 1 near the sleeve 13 end. It has.
[0005]
The sleeve 13 has outward protruding edges 17 on the outer periphery of both ends, and has a stopper 19 of the corrugated tube 1 on the inner periphery of the center (the stopper 19 may not be provided).
The retainer 15 is composed of a superior arc-shaped member 15A having a circumferential length greater than a half circumference of the sleeve 13 and the corrugated tube 1, and an inferior arc-shaped member 15B that complements the circumferential missing portion of the superior arc-shaped member 15A. Has been.
[0006]
The superior arc-shaped member 15A and the subarc-shaped member 15B have an inward projecting edge 21 that is hooked in the axial direction with respect to the outward projecting edge 17 of the sleeve 13, and a trough depression on the outer periphery of the corrugated tube 1 . It has an inwardly extending ridge 23 that is hooked in the axial direction with respect to the tube 1. The arcuate member 15A is elastic in such a form that even if an external force is applied and the distance between both ends is extended to the distance where the sleeve 13 and the corrugated tube 1 are inserted, the external force is removed to return to the original state. .
[0007]
Further, the superior arc member 15A and the inferior arc member 15B have concave and convex connecting portions 25A and 25B that can be inserted and removed in the radial direction and hooked to each other in the circumferential direction. In this example, the connecting portions 25A at both ends of the superior arc-shaped member 15A are T-shaped recesses (recesses with a wider width at the back), and the connecting portions 25B at both ends of the inferior arc-shaped member 15B are the T-shaped recesses. The fitting is a T-shaped convex part (a convex part having a wider tip end).
[0008]
The inner diameter of the intermediate portion of the sleeve 13 is close to the packing 3 attached to the outer periphery of the corrugated tube 1 in order to maintain waterproofness. In order to facilitate the insertion of the corrugated tube 1, the inner peripheral surfaces of both end portions of the sleeve 13 are tapered surfaces whose inner diameter gradually increases toward the opening end.
[0009]
When this pipe joint 11 is used, the corrugated pipes 1 and 1 can be easily connected as follows.
First, from one end side of the sleeve 13, the corrugated tube 1 with the packing 3 attached to the outer periphery is inserted until the tip hits the stopper 19. Next, after arranging the arcuate member 15A 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, the arcuate member 15A is arranged in the radial direction of the sleeve 13. Push in.
[0010]
Then, both ends of the arc-shaped member 15A are expanded to the outer diameter of the sleeve 13 and the corrugated tube 1, and then restored to the original state by the elasticity of the arc-shaped member 15A itself, and the sleeve 13 and the corrugated tube 1 are held. It will be in a state to hold. In this state, the inward protruding edge 21 of the dominant arc member 15A and the outward protruding edge 17 of the sleeve 13 are hooked together in the axial direction, and the inward protrusion 23 of the dominant arc member 15A is the corrugated tube 1. One corrugated tube 1 cannot be pulled out from the sleeve 13 because it falls into the valley and is hooked in the axial direction with respect to the tube 1.
[0011]
Thereafter, one T-shaped convex portion 25B of the subarc-shaped member 15B is fitted into one T-shaped concave portion 25A of the superarc-shaped member 15A, and the other T-shaped convex portion 25B of the subarc-shaped member 15B is further superior. The arcuate member 15A is fitted into the other T-shaped recess 25A. As a result, the superior arc member 15A and the underarc member 15B are connected in an annular shape, and the connection of the one corrugated tube 1 to the sleeve 13 is completed. The other corrugated tube 1 is connected in the same manner.
[0012]
When the both ends of the superior arc member 15A are connected by the inferior arc 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 of only the arcuate member 15A, when a strong pulling force is applied to the corrugated tube 1, the distance between both ends of the arcuate member 15A is gradually increased, and the corrugated tube 1 is pulled out. When both ends of the superior arc-shaped member 15A are connected by the inferior arc-shaped member 15B, both ends of the superior arc-shaped member 15A are difficult to open even when a strong pulling force is applied to the corrugated tube 1. It will be greatly improved. According to the prototype test, it was confirmed that when the underarc-shaped member 15B is attached, the pull-out strength is improved about four times as compared with the case where it is not attached.
With such use of the pipe fitting 11 shown in FIGS. 10 and 11, it is possible to obtain a large connection of pull-out strength of the corrugated tube 1.
[0013]
However, when the connection performance of this 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 connecting portion between the superior arc member 15A and the subarc member 15B. It has been found that there is a case where a strong connection state cannot be maintained due to the disconnection. The cause is considered as follows.
[0014]
That is, the connecting portion of the T-shaped convex portion 25B of the subarc-shaped member 15B and the T-shaped concave portion 25A of the dominant arc-shaped member 15A is caught in the circumferential direction, but there is a relative shift in the radial direction. It is in a possible state. On the other hand, when the pipe joint 11 and the corrugated pipes 1 and 1 in the vicinity thereof are strongly bent, compressive stress acts on the inside of the bend and tensile stress acts on the outside as shown in FIG. The stress distribution is complex with different directions. For this reason, uneven deformation tends to occur in each member. As a result, when a stress that causes displacement of the T-shaped concave portion 25A or the T-shaped convex portion 25B from the inside to the outside occurs, a relative radial shift occurs between the T-shaped concave portion 25A and the T-shaped convex portion 25B. The connecting part will come off.
[0015]
[Means for Solving the Problems]
The pipe joint according to the present invention is
A sleeve into which the corrugated tube to be connected is inserted, and a stopper that engages the outer periphery of the end of the sleeve and the outer periphery of the corrugated tube near the sleeve end,
The retainer is composed of a superior arc-shaped member having a circumference greater than a half circumference of the sleeve and the corrugated tube, and an inferior arc-shaped member that complements the circumferential missing portion of the superior arc-shaped member,
At least the former of the arc-shaped member and the subarc-shaped member has, on the inner periphery, a portion that hooks in the axial direction with respect to the sleeve, and a portion that hooks in the axial direction with respect to the corrugated tube. And
The above-mentioned arcuate member has elasticity enough to return to its original state when the external force is removed even if the external force is applied to widen the distance between both ends to the interval where the sleeve and the corrugated tube are inserted, and no external force is applied. The inner diameter of the portion to be attached to the sleeve in a state is formed smaller than the outer diameter of the portion to which the dominant arc-shaped member of the sleeve is attached,
The superior arc-shaped member and the inferior arc-shaped member have concavo-convex connecting portions that can be inserted and removed in the radial direction and caught in the circumferential direction at both ends,
After inserting the corrugated tube into the sleeve, attach the superior arc-shaped member so as to straddle the outer periphery of the end of the sleeve and the outer periphery of the corrugated tube, and connect both ends of the superior arc-shaped member with the subarc-shaped member. , To prevent the corrugated tube from pulling out of the sleeve,
(Claim 1).
[0016]
Since this pipe joint is in a state in which the sleeve is tightened when the superior arc-shaped member is attached to the end of the sleeve, the connection state is stabilized.
[0017]
In addition, the pipe joint of the present invention has a diameter that prevents relative displacement of the connecting portions when the super arc member and the sub arc member are connected to both ends and the connecting portions are connected to each other. It is preferable to have a direction deviation prevention part (Claim 2).
[0018]
By providing the radial displacement stopper as described above, it is possible to prevent the connecting portion between the superior arc member and the inferior arc member from being disconnected when the connecting portion of the pipe is bent.
[0019]
Delete [0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1
1 to 5 show a first embodiment of the present invention. 1 to 5, the same parts as those shown in FIGS. 10 and 11 described above are denoted by the same reference numerals.
[0021]
The pipe joint 11, as different from 10 and 11, the major arc-shaped member 15 A, the inner diameter of the portion 21 to be attached to the sleeve 13 in a state not applied external force (see FIGS. 1 and 2) but a possible major arc-shaped member 15 a of the sleeve 13 is slightly smaller than the outer diameter of the portion to be mounted, at both ends of the minor arc-shaped member 15B as shown in FIG. 2 and FIG. 3, T-shaped convex The protrusions 27 projecting in the circumferential direction on the inner peripheral side from the portion 25B are formed, and notches where the protrusions 27 enter the inner peripheral side from the T-shaped recess 25A at both ends of the dominant arc-shaped member 15A 29 is formed. The projecting piece 27 of the inferior arc-shaped member 15B is formed on the inner peripheral side portion of the inward projecting ridge 23 of the inferior arc-shaped member 15B that falls into the trough portion of the pipe 1. The cutout portion 29 of the superior arc-shaped member 15A is formed by notching the inner peripheral side portion of the inwardly extending ridge 23 of the superior arc-shaped member 15A that falls into the trough portion of the pipe 1.
[0022]
The major arc-shaped member 15 A, the portion 21 (see FIGS. 1 and 2) mounted on the sleeve 13 in a state not applied external force the inner diameter of the outer portion major arc-shaped member 15 A of the sleeve 13 is mounted when is slightly smaller rather form than the diameter, major arc-shaped member 15 a is, since a state of tightening the sleeve 13 when mounted on the end of the sleeve 13, the connection state is stabilized. The projecting piece 27 and the notch 29 are cut off when the superior arc-shaped member 15A and the inferior arc-shaped member 15B are connected as shown in FIG. 4 (A). The T-shaped convex portion 25B and the T-shaped concave portion 25A that enter the notch 29 and are in a connected state are prevented from being relatively displaced in the radial direction. Thus, in order to smoothly perform the operation of engaging the projecting piece 27 with the notch 29, the corner 27a on the outer peripheral side of the distal end of the projecting piece 27 is chamfered into a curved surface. The corner 29a on the outer peripheral side of the entrance of the notch 29 is also chamfered with a curved surface.
The configuration other than the above is the same as the pipe joint shown in FIGS.
[0023]
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 seen from the outside. The sleeve 13 can be manufactured by, for example, high-density polyethylene blow molding.
[0024]
Further, it is preferable that the perimeter of the arc-shaped member 15A is 200 ° to 260 ° with a central angle θ .
[0025]
On the other hand, it is preferable that the inferior arc-shaped member 15B has the same radius of curvature as that of the superior arc-shaped member 15A when attached to the sleeve 13 with no external force applied.
The superior arc member 15A and the inferior arc member 15B can be manufactured, for example, by injection molding of ABS resin, polypropylene, polyamide, or the like.
[0026]
5A to 5C show a procedure for connecting the corrugated pipes 1 and 1 using the pipe joint 11 of this embodiment. FIG. 5 (A) shows that one (left side) corrugated tube 1 is inserted into the sleeve 13 and a superior arc-shaped member 15A and an inferior arc-shaped member 15B are attached, and the connection of one corrugated tube 1 is completed. The other (right side) corrugated tube 1 is inserted into the sleeve 13. After that, after inserting the other corrugated tube 1 into the sleeve 13, as shown in FIG. 5 (B), the superior arc-shaped member 15 A 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. To do. For this mounting, it is only necessary to push in the radial direction of the sleeve 13 with both ends of the superior arc-shaped member 15A straddling the outer periphery of the end portion of the sleeve 13 and the outer periphery of the corrugated tube 1.
[0027]
As a result, the dominant arc-shaped member 15A holds the sleeve 13 and the corrugated tube 1, and the inward protruding edge 21 of the dominant arc-shaped member 15A and the outward protruding edge 17 of the sleeve 13 are hooked together in the axial direction. Since the inwardly protruding ridge 23 of the arc-shaped member 15 </ b> A falls into the valley of the corrugated tube 1, the corrugated tube 1 cannot be pulled out from the sleeve 13.
[0028]
Thereafter, the subarc-shaped member 15B is disposed as shown in FIG. 5C, and first, the T-shaped convex portion 25B at one end of the subarc-shaped member 15B is formed as shown in FIG. Fit into the T-shaped recess 25A at one end, and then fit the T-shaped projection 25B at the other end of the inferior arc-shaped member 15B into the T-shaped recess 25A at the other end of the dominant arc-shaped member 15A as shown in FIG. Combine. It may be smoother to perform these fittings at both ends simultaneously. As a result, the superior arc-shaped member 15A and the inferior arc-shaped member 15B are connected in an annular shape, and a connection state as shown in FIG. 1 is obtained.
[0029]
In the connected state of FIG. 1, first, the outward projecting edge 17 of the sleeve 13, the arcuate member 15A, and the inward projecting edge 21 of the inferior arc member 15B are hooked together in the axial direction, and the arcuate member 15A and Since the inwardly extending ridge 23 of the subarc shaped member 15B falls into the valley of the corrugated tube 1, the corrugated tube 1 is prevented from being pulled out.
Second, since both ends of the superior arc member 15A are connected by the inferior arc member 15B, both ends of the superior arc member 15A are difficult to open even if a strong pulling force is applied to the corrugated tube 1. For this reason, the pullout strength of the corrugated tube 1 is significantly greater than the arc.
Third, the protrusions 27 at both ends of the inferior arc-shaped member 15B enter the notch portions 29 at both ends of the superior arc-shaped member 15A, and the connected T-shaped concave portion 25A and T-shaped convex portion 25B are displaced in the radial direction. To prevent. For this reason, even if the connecting portion is forcibly bent, the T-shaped concave portion 25A and the T-shaped convex portion 25B are not easily detached, and the connected state can be stably maintained.
[0030]
[ Related Technology 1 ]
6 and 7 show related techniques of the present invention. This pipe joint 11 is different from that of the first embodiment in that the projecting piece 27 and the notch 29 in the first embodiment are omitted, and the fastening band is attached to the outer periphery of the superior arc member 15A and the inferior arc member 15B. The groove 31 extending in the circumferential direction is formed.
[0031]
This pipe joint 11 is connected to the outer circumferences of the connected major arc shaped member 15A and the subarc shaped member 15B along the groove 31 after connecting the corrugated pipes 1 and 1 in the same manner as the pipe joint of the first embodiment. The steel band 33 is wound and tightened to prevent radial displacement between the T-shaped concave portion 25A and the T-shaped convex portion 25B when the connecting portion is bent. Since other configurations, usage methods, and operational effects are the same as those of the first embodiment, the same parts are denoted by the same reference numerals and description thereof is omitted.
[0032]
[Embodiment 2 ]
8 and 9 show a second embodiment of the present invention. This pipe joint 11 is a combination of the first embodiment and the related technique 1 . That is, the protrusion 27 provided at both ends of Retsukogata member 15B, provided with a notch 29 at both ends of the major arc-shaped member 15A, a clamping band fitted on the outer periphery of the major arc-shaped members 15A and Retsukogata member 15B The groove 31 is formed. Since other configurations, usage methods, and operational effects are the same as those of the first embodiment and the related art 1, the same portions are denoted by the same reference numerals and description thereof is omitted.
[0033]
Delete [0034]
【The invention's effect】
Pipe joint according to the present invention described above, it is possible to connect the tube easily, pull-out strength of the pipe after the connection is very large, deer also there is an effect that the connection state can be maintained stably.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing a first embodiment of a pipe joint according to the present invention.
2A is a side view, and FIG. 2B is a partially cut front view of a retainer in the pipe joint of FIG. 1;
3 is a perspective view showing a connecting portion of the retainer in FIG. 2. FIG.
FIGS. 4A and 4B are front views showing a procedure for connecting the retainer of FIG.
5A to 5C are partially cutaway side views showing a procedure for connecting corrugated pipes using the pipe joint of FIG.
FIG. 6 is a partially cutaway side view showing a related technique of the pipe joint according to the present invention.
7A is a side view, and FIG. 7B is a partially cut front view of a retainer in the pipe joint of FIG.
FIG. 8 is a partially cutaway side view showing a second embodiment of the pipe joint according to the present invention.
9A is a side view, and FIG. 9B is a partially cutaway front view of a retainer in the pipe joint of FIG. 8;
FIG. 10 is a partially cutaway side view of a pipe joint that is the basis of the present invention.
11A is a half-cut front view, and FIG. 11B is a side view of the retainer in the pipe joint of FIG.
FIG. 12 is an explanatory diagram of stress generated when a tube is bent.

Claims (4)

A sleeve (13) into which the corrugated tube (1) to be connected is inserted, and a stopper (15) that engages the outer periphery of the end of the sleeve (13) and the outer periphery of the corrugated tube (1) near the sleeve end. )
The retainer (15) includes a dominant arc-shaped member (15A) having a circumferential length larger than a half circumference of the sleeve (13) and the corrugated tube (1), and a circumferentially missing portion of the dominant arc-shaped member (15A). Consisting of a subarc-shaped member (15B) that complements
Of the above-mentioned arcuate member (15A) and underarc-shaped member (15B), at least the former is on the inner periphery, a portion (21) that is axially hooked to the sleeve (13), and the corrugated tube (1 ) And a portion (23) that is hooked in the axial direction with respect to
The arcuate member (15A) is elastic enough to return to its original state when the external force is removed even if the external force is applied and the distance between both ends is extended to the distance where the sleeve (13) and the corrugated tube (1) are inserted. the inner diameter of the portion to be attached to the sleeve (13) of which, and in a state in which external force is not applied has found major arc-shaped member (15 a) is formed smaller than the outer diameter of the portion to be mounted in the sleeve (13) And
The superior arc-shaped member (15A) and the subarc-shaped member (15B) have concavo-convex connecting portions (25A, 25B) that can be inserted and removed in the radial direction and hooked to each other in the circumferential direction.
After inserting the corrugated tube (1) into the sleeve (13), equipped with a major arc-shaped member (15 A), so as to straddle the outer periphery of an end portion outer periphery corrugated tube sleeves (13) (1), further both ends of the major arc-shaped member (15 a) coupled with minor arc-shaped member (15 B), the corrugated tube (1) to not withdrawn from the sleeve (13),
Pipe fittings characterized by   Excellent arc shape member ( 15 A) and underarc-shaped members (15 B ) On both ends, the connecting part ( twenty five A, twenty five When B) is connected to each other, the connecting part ( twenty five A, twenty five B) A radial deviation preventing portion (for preventing relative displacement in the radial direction) 27 , 29 The pipe joint according to claim 1, characterized in that   The connecting portions (25A) at both ends of the arc-shaped member (15A) are T-shaped concave portions, and the connecting portions (25B) at both ends of the inferior arc-shaped member (15B) are T-shaped convex portions that fit into the T-shaped concave portions. The pipe joint according to claim 1, wherein:   The connecting parts at both ends of the arc-shaped member (15A) are T-shaped recesses (25A), and the connecting parts at both ends of the inferior arc-shaped member (15B) are T-shaped protrusions that fit into the T-shaped recesses (25B). (25B) and the projecting piece (27) formed so that the radial displacement preventing portions at both ends of the inferior arc-shaped member (15B) protrude in the circumferential direction from the T-shaped convex portion (25B) to the inner peripheral side. And the radial displacement preventing portions at both ends of the superior arc-shaped member (15A) are notched portions (29) into which the protruding pieces (27) formed on the inner peripheral side from the T-shaped concave portion (25A) are inserted. The pipe joint according to claim 1.

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