JP2010043719A - Fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting which can perform a connection between both spiral-tube ends easily and surely, and is not seceded when impact or vibration is received in a connecting section with the spiral tube. <P>SOLUTION: The present invention, wherein: a fitting 1 connecting ends of tubes mutually is constituted from a first fitting member 2 connected to one tube, and a second fitting member 3 connected to the other tube; the first fitting member provides an outer-tube section 23, and the second fitting member includes an inner-tube section 33; the inner-tube section is slidably inserted in a direction that the first fitting member and the second fitting member are telescoped with respect to the outer-tube section; and between the outer-tube section and the inner-tube section, a falling-out proof stopper means, for regulating the inner-tube section so that it may not be fallen out from the outer-tube section, is arranged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe joint for connecting pipes used as protective pipes such as the civil engineering field, electric cable, and optical cable.

  Conventionally, electric cables and optical cables are generally embedded in the ground in a state where they are inserted into a long cylindrical protective tube. As such a protective tube, a spiral tube having a spiral concavo-convex line formed on the outer peripheral surface thereof may be used.

  At the place where the spiral tube is laid, the ends of the spiral tube cut to a predetermined length are connected by a pipe joint.

  The pipe joint includes a one-side joint portion having a threaded portion that is screwed into an end portion of one spiral tube, and an other-side joint portion having a threaded portion that is threadedly engaged with the end portion of the other spiral tube. And the connection pipe | tube provided in the other side joint part is made to closely_fit by the one side joint part (for example, refer patent document 1).

Moreover, as another pipe joint, it consists of the one side joint part which has a thread part similarly to the above, and the other joint part. And both joint parts are the structures connected by the reverse screw screwed in the reverse direction to the said thread part (for example, refer patent document 2).
Japanese Utility Model Publication No. 64-12988 JP-A-60-132200

  There may be some errors in the length of the spiral tube at the installation site of the spiral tube. However, in any of the conventional pipe joints, since the connecting parts are fixed between the two joint parts, the length of the pipe joint in the pipe longitudinal direction is constant. As a result, when the length of the spiral tube is short (when the interval between the ends of the spiral tube is slightly large), the fitting between the pipe joint and the spiral tube may be insufficient. Further, when the operator forcibly pulls the spiral tube, the impact, vibration, etc. act on the spiral tube, and there is a possibility that the end portion on the short screwing side of the spiral tube is detached from the pipe joint. .

  An object of the present invention is to solve such a problem, and it is possible to easily and surely connect the end portions of both spiral tubes, and when a connection portion with the spiral tubes is subjected to impact, vibration, or the like. A pipe joint that does not disengage is provided.

  In order to achieve the above object, the present invention provides a pipe joint for connecting ends of pipes, a first pipe joint member connected to one pipe, and a second pipe joint connected to the other pipe. The first pipe joint member includes an outer cylindrical part, the second pipe joint member includes an inner cylindrical part, and the inner cylindrical part is configured with respect to the outer cylindrical part. The first pipe joint member and the second pipe joint member are slidably inserted in an extending and contracting direction, and the inner cylindrical portion is an outer cylindrical shape between the outer cylindrical portion and the inner cylindrical portion. There is a stopper means for preventing the stopper from coming out of the part.

  Further, the present invention is a pipe joint for connecting ends of a spiral pipe having a convex shape on the outer peripheral surface, the first pipe joint member connected to one spiral pipe, and the other A second pipe joint member connected to the spiral pipe, wherein the first pipe joint member has a fitting tube portion having a recess that is screwed into the convex shape of the one spiral pipe, and the fitting An outer cylindrical portion extending from the cylindrical portion, and the second pipe joint member has a fitting cylindrical portion having a groove that is screwed into the convex shape of the other helical tube, and the fitting cylinder An inner cylindrical portion extending from the portion, and the inner cylindrical portion is slidable relative to the outer cylindrical portion in a direction in which the first pipe joint member and the second pipe joint member expand and contract. Between the outer cylindrical portion and the inner cylindrical portion that is inserted, there is provided a stopper stopper that restricts the inner cylindrical portion from coming out of the outer cylindrical portion. That.

  And since the pipe joint of this invention is a structure in which the said 1st pipe joint member and the said 2nd pipe joint member expand-contract, each pipe joint member can be screwed together to a mutual position to a predetermined position. It is possible to easily and reliably connect the ends of both spiral tubes.

  In addition, a stopper stopper means is provided between the outer cylindrical portion and the inner cylindrical portion to prevent the inner cylindrical portion from slipping out of the outer cylindrical portion. It can be prevented from falling off when subjected to shock or vibration.

  In the pipe joint, the outer cylindrical portion and the inner cylindrical portion are each provided with a screw that passes after being screwed together when the inner cylindrical shape is inserted into the outer cylindrical portion. At the end of the male screw provided in the part, a retaining part is formed in the circumferential direction of the inner cylindrical part, and the retaining part comes into contact with the female screw provided in the outer cylindrical part, thereby The part is prevented from coming out of the outer cylindrical part.

  In the pipe joint, the threaded portions of the outer cylindrical portion and the inner cylindrical portion are reverse screws formed in a direction opposite to the convex spiral direction of both the helical tubes.

  In the present invention, since the first pipe joint member and the second pipe joint member are slightly expanded and contracted, each pipe joint member can be fitted to each other to a predetermined position. Connection to the end can be performed easily and reliably.

  In addition, since a stopper stopper is provided between the outer cylindrical portion and the inner cylindrical portion to prevent the inner cylindrical portion from slipping out of the outer cylindrical portion, an impact is applied to the connection portion with the pipe. Can be prevented from falling off even when subjected to vibration or vibration.

  Hereinafter, a pipe joint according to an embodiment of the present invention will be described with reference to the drawings.

  1 to 8 show an embodiment of a pipe joint according to the present invention. 1 to 3, such a pipe joint 1 is a spiral pipe joint that connects a pipe end A <b> 1 of one spiral pipe A and a pipe end B <b> 1 of the other spiral pipe B.

  Both spiral tubes A and B are made of a synthetic resin or a metal such as aluminum, and corrugated and rectangular spiral ridges (threads) A2 and B2 are provided on the outer peripheral surfaces of the tubes A and B. It is formed with a pitch. In the present embodiment, the ridges A2 and B2 are, for example, right-handed screws.

  The pipe joint 1 includes a first pipe joint member 2 connected to the pipe end part A1 of one spiral pipe A and a second pipe joint member 3 connected to the pipe end part B1 of the other spiral pipe B. Has been. The first pipe joint member 2 and the second pipe joint member 3 are each molded from a synthetic resin.

  In the first pipe joint member 2, a fitting cylinder portion 22 having a screw (female screw) 21 screwed into the convex line A <b> 2 of the one spiral tube A from the outside and an outer cylindrical portion 23 are integrally formed. It is molded. A stopper portion 26 is provided at the end of the fitting tube portion 22.

  The stopper portion 26 is formed by forming in the circumferential direction a recess having a smaller diameter than the inner diameter of the female screw 21 of the fitting cylinder portion 22. The fitting tube portion 22 is fitted to the tube end portion A1 of the spiral tube A until it comes into contact with the stopper portion 26, so that the spiral tube A and the first pipe joint member 2 are securely screwed to a predetermined position. be able to.

  Further, a cylindrical watertight sealing sheet 25 as a seal member is provided on the inner peripheral surface of the fitting cylinder portion 22. As the water-tight sealing sheet 25, conventionally known materials such as a nonwoven fabric and a rubber material having water-tightness with the spiral tube A are used.

  The outer cylindrical portion 23 includes a small diameter cylindrical portion 23a extending from the stopper portion 26 and a large diameter cylindrical portion 23b extending from the small diameter cylindrical portion 23a. Then, a left female screw 24 composed of a left four-thread is formed on a part of the large-diameter cylindrical portion 23b in the cylinder longitudinal direction (the direction along the cylinder axis). FIG. 8A shows a developed view of the left screw 24, in which 24a denotes a screw thread. The portion of the large diameter cylindrical portion 23b where the left screw 24 is not formed has a flat cylindrical shape. As shown in FIG. 7, a space (sliding gap) S having a predetermined distance L is formed between the left screw 24 and the end surface 23a1 of the small-diameter cylindrical portion 23a.

  The second pipe joint member 3 includes a fitting cylinder part 32 having a screw (female thread) 31 that is screwed from the outside to the protrusion B2 of the pipe end part B1 of the other helical pipe B, and the outer cylindrical part 23. The inner cylindrical part 33 to be inserted into is integrally molded. A stopper portion 36 is provided at the end of the fitting cylinder portion 32.

  The stopper portion 36 is formed by forming a concave strip having a diameter smaller than the inner diameter of the female screw 31 of the fitting cylinder portion 32 in the circumferential direction. The fitting tube portion 32 is fitted to the tube end B1 of the spiral tube B until it comes into contact with the stopper portion. Thus, the helical tube B and the second pipe joint member 3 can be reliably screwed to a predetermined position.

  A cylindrical watertight sealing sheet 35 as a seal member is provided on the inner peripheral surface of the fitting cylinder portion 32. As the watertight sealing sheet 35, conventionally known materials such as a nonwoven fabric and a rubber material having watertightness with the spiral tube B are employed.

  The inner cylindrical portion 33 extends from the stopper portion 36, and extends from the large diameter cylindrical portion 33b. The large diameter cylindrical portion 33b extends from the distal end side of the large diameter cylindrical portion 23b of the first pipe joint member 2. The small-diameter cylindrical portion 33a.

  The small-diameter cylindrical portion 33a is inserted into the large-diameter cylindrical portion 23b of the first pipe joint member 2, and a small-diameter cylindrical portion is included in a part of the small-diameter cylindrical portion 33a in the cylinder longitudinal direction (the direction along the cylinder axis). When inserting 33a into the large diameter cylindrical portion 23b, a left male screw 34 is formed which is screwed into the left female screw 24 provided in the large diameter cylindrical portion 23b.

  The left male screw 34 passes through the left female screw 24 and is positioned in the sliding space S. The left male screw 34 is slidable in the sliding space S, and the first pipe joint member 2 and the second pipe joint member 3 are configured to expand and contract in the cylinder longitudinal direction by a predetermined distance L. Yes.

  Further, as shown in FIG. 8 (b), the end of the thread 34a of the left male screw 34 (the end when the small diameter cylindrical portion 33a is inserted into the large diameter cylindrical portion 33b) is annular so as to be a non-threaded portion. The retaining portion 37 is continuously formed in the circumferential direction of the small diameter cylindrical portion 33a.

  As shown in FIG. 8C, the outer diameter of the retaining portion 37 is set to be larger than the inner diameter of the left female screw 24 and smaller than the outer diameter of the left male screw 34. The end surface 37a of the retaining portion 37 is a flat surface. Moreover, the outer peripheral surface 37b of the retaining portion 37 is an inclined surface that gradually protrudes toward the end surface 37a.

  Therefore, when the first pipe joint member 2 and the second pipe joint member 3 are rotated relative to each other and screwed together, the left female screw 24 of the first pipe joint member 2 is prevented from coming off by the retaining portion 37 of the second pipe joint member 3. The outer peripheral surface 37b is slid and the retaining portion 37 is overcome.

  Thus, the retaining portion 37 allows the first pipe joint member 2 and the second pipe joint member 3 to be connected. However, once the left female screw 24 passes through the outer peripheral surface 37b of the retaining portion 37, the left female screw 24 has an end surface 37a from the direction in which the first pipe joint member 2 and the second pipe joint member 3 extend (the direction to exit). Lock to. For this reason, even if the 1st pipe joint member 2 and the 2nd pipe joint member 3 rotate relatively in the direction opposite to the time of insertion, the 1st pipe joint member 2 and the 2nd pipe joint member 3 come out carelessly. Can be prevented.

  The first pipe joint member 2 and the second pipe joint member 3 can be molded by known molding means such as blow molding means or injection molding means. First, the second pipe joint member 3 is molded and cooled to room temperature. On the other hand, the first pipe joint member 2 is screwed together with the first pipe joint member 2 and the cooled second pipe joint member 3 in a state where the residual heat during molding remains.

  As described above, the second pipe joint member 3 has the resin contracted by cooling, and the outer diameters of the left male screw 34 and the retaining portion 37 are the smallest. On the other hand, since the first pipe joint member 2 is in a state where the residual heat during molding remains, the resin is not contracted, and the inner diameter of the left female screw 24 is slightly increased.

  Therefore, in this state, when the left female male screws 24, 34 of the first pipe joint member 2 and the second pipe joint member 3 are screwed together, the left female screw 24 slides on the outer peripheral surface 37b of the retaining portion 37, It becomes easy to get over the retaining portion 37. As a result, the first pipe joint member 2 and the second pipe joint member 3 can be easily and quickly connected by relatively rotating.

  The retaining portion 37 of the second pipe joint member 3 and the left female screw 24 of the first pipe joint member 2 constitute a retaining stopper means. Further, between the first pipe joint member 2 and the second pipe joint member 3, a seal member 40 made of an O-ring or a nonwoven fabric is appropriately interposed.

  Next, the case where the spiral pipes A and B are connected to each other using the pipe joint 1 having the above-described configuration will be described.

  First, the fitting tube portion 22 of the first pipe joint member 2 is screwed and connected to the tube end portion A1 of one spiral tube A to a predetermined position. Moreover, the fitting cylinder part 32 of the 2nd pipe joint member 3 is screwed and connected to pipe end part B1 of the other spiral pipe B to a predetermined position. When the second pipe joint member 3 is screwed into the spiral pipe B, a play that can expand and contract in the longitudinal direction of the pipe is provided between the first pipe joint member and the second pipe joint member.

  For this reason, even if there is a slight error in the interval between the pipe end portions A1 and B1 of the spiral pipes A and B, the first pipe joint member 2 and the second pipe joint member 3 are extendable. Therefore, the error can be absorbed. When the first pipe joint member 2 and the second pipe joint member 3 are extended from each other, the retaining portion 37 abuts on the left female screw 24, so the first pipe joint member 2 and the second pipe joint member 3 Withdrawal is prevented.

  Moreover, since the 1st pipe joint member 2 and the 2nd pipe joint member 3 are not screwed in the connected state, they are relatively rotatable and can be easily and quickly screwed into the spiral pipes A and B. Yes.

  As a result, the connection between the spiral tubes A and B is ensured, and the connection between the spiral tubes A and B and the pipe joint 1 is not inadvertently disconnected.

  When the first pipe joint member 2 and the second pipe joint member 3 are extended to each other, the retaining portion 37 abuts against the guide tube portion 25, so that separation is prevented.

  Further, the screwing of the first pipe joint member 2 and the second pipe joint member 3 can be performed in a separate process from the manufacturing process of the first pipe joint member 2 and the second pipe joint member 3. That is, even after both the joint members 2 and 3 are cooled, it is possible to heat only the first pipe joint member 2 and then screw both the joint members 2 and 3 together.

  Further, both the joint members 2 and 3 are forcibly screwed together by utilizing the elastic deformation of the first pipe joint member 2 and the second pipe joint member 3 (with the left female screw 24 and the retaining portion 37). It is also possible.

  Further, after the first pipe joint member 2 is screwed into one spiral pipe A and the second pipe joint member 3 is screwed into the other spiral pipe B, the first pipe joint member 2 and the second pipe joint member 3 are joined. Can also be connected. In such a case, the first pipe joint member 2 and the second pipe joint member 3 are screwed into the spiral pipes A and B in a separate state. Further, the first pipe joint member 2 and the second pipe joint member 3 are screwed together. When the first pipe joint member 2 and the second pipe joint member 3 are screwed together, the left female screw 24 and the left male screw 34 are the reverse threads of the convex strips A1 and B2 of the helical tubes A and B. The first pipe joint member 2 and the second pipe joint member 3 and both the spiral pipes A and B are rotated in a direction in which the connection is strengthened.

  In addition, the screw of the 1st pipe joint member 2 and the 2nd pipe joint member 3 is not restricted to a left-hand thread, A right-hand thread may be sufficient. Moreover, the ridges A1 and B2 of the spiral tubes A and B may be left-handed screws.

  The present invention is not limited to the embodiment described above. For example, FIGS. 9 and 10 show another embodiment of the present invention. In FIG. 9 and FIG. 10, the same members as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the present embodiment, the fitting tubular portion 22 and the outer tubular portion 23 of the first pipe joint member 2 are formed of separate members. Moreover, the outer cylindrical portion 23 has a two-divided structure by the half members 23C and 23D.

  A connecting tube portion 28 extends from the stopper portion 26, and an annular locking portion 28 a projects from the outer peripheral surface of the connecting tube portion 28. Locking recesses 23C1 and 23D1 that are respectively fitted on the locking portions 28a are provided at the ends of the half-split members 23C and 23D in the circumferential direction of the half-split members 23C and 23D. Flange portions 23C2 and 23D2 are respectively provided on the outer peripheral surfaces of the half members 23C and 23D, and both flange portions 23C2 and 23D2 are fastened and fixed by bolts (not shown).

  In addition, annular ridges 24A and 24B project from the inner peripheral surfaces of the half members 23C and 23D in place of the left female screw 24.

  In addition, an annular retaining portion 37 protrudes from the small diameter cylindrical portion 33 a of the inner cylindrical portion 33 of the second pipe joint member 3. The protruding strips 24A and 24B and the retaining portion 37 constitute a retaining stopper means.

  In the pipe joint 1 according to the other embodiment, similarly to the pipe joint 1, the connection between both the spiral pipes A and B is ensured, and the connection between the spiral pipes A and B and the pipe joint 1 is inadvertent. It will not come off.

  Moreover, when the 1st pipe joint member 2 and the 2nd pipe joint member 3 are mutually extended | stretched, since the retaining part 37 contact | abuts to the protruding item | line 24A, 24B, detachment | leave is prevented.

  Even if the spiral tubes A and B exemplified in the present embodiment have the spiral ridges A2 and B2 over the entire length, the ridges A2 and B2 are partially formed in the connection portion with the pipe joint 1. It may have.

  In addition, the pipes A and B are not spiral pipes, but are provided with independent ridges (single or multiple ridges formed in the pipe circumferential direction) or without ridges. It may be. In such a case, it is not necessary to provide female threads in the fitting tube portions 22 and 23 of the first pipe joint member 2 and the second tube joint member 3, and the fitting tube portions A1 and A2 of the tubes A and B are fitted tube portions. 22 and 23 are forcibly fitted.

  Further, for the seal between the pipes A and B and the first pipe joint member 2 and the second pipe joint member 3, a seal member (not shown) is provided on the end surfaces 26a and 36a of the stopper portions 26 and 36, and this seal member is attached to the pipe. It is also possible to contact the end surfaces of the end portions A1 and B1. The shape and position of the seal member can be arbitrarily set. Depending on the use of the pipes A and B, a seal member between the pipes A and B and the pipe joint 1 and a seal member between the first pipe joint member 2 and the second pipe joint member 3 are not necessarily provided. There is no need.

It is sectional drawing of the state which the pipe joint which concerns on one embodiment of this invention extended | stretched. It is sectional drawing of the state which the pipe joint contracted. It is a front view of the state which connected the spiral pipe with the pipe joint. It is the front view which decomposed | disassembled the pipe joint. It is a perspective view of the 1st pipe joint member of the pipe joint. It is a perspective view of the 2nd pipe joint member of the pipe joint. It is sectional drawing which decomposed | disassembled the pipe joint. (A) is a development view of the left female thread of the first pipe joint member, (b) is a development view of the left male thread of the second pipe joint member, and (c) is a cross-sectional view taken along line AA of (b). It is the front view which decomposed | disassembled the pipe joint which concerns on other embodiment of this invention. It is sectional drawing of the state which the pipe joint extended.

Explanation of symbols

A One spiral tube A1 Pipe end A2 Convex B The other spiral tube B1 Pipe end B2 Convex 1 Pipe joint 2 First pipe joint member 3 Second pipe joint member 21 Female thread (screw)
22 Fitting cylinder part 23 Outer cylindrical part 24 Left female screw (screw)
26 Stopper part 31 Right female thread 32 Fitting cylinder part 33 Inner cylindrical part 34 Left male thread 36 Stopper part 37 Retaining part

Claims (4)

A pipe joint for connecting ends of pipes,
A first pipe joint member connected to one pipe and a second pipe joint member connected to the other pipe;
The first pipe joint member includes an outer cylindrical part, and the second pipe joint member includes an inner cylindrical part,
The inner tubular part is slidably inserted in the direction in which the first pipe joint member and the second pipe joint member expand and contract with respect to the outer tubular part,
A pipe joint characterized in that a stopper stopper means is provided between the outer cylindrical part and the inner cylindrical part to restrict the inner cylindrical part from coming out of the outer cylindrical part. A pipe joint that connects the ends of a spiral pipe having a convex shape on the outer peripheral surface,
A first pipe joint member connected to one spiral pipe and a second pipe joint member connected to the other spiral pipe;
The first pipe joint member includes a fitting cylinder portion having a recess that is screwed into the convex shape of the one helical tube, and an outer cylinder portion extending from the fitting cylinder portion,
The second pipe joint member includes a fitting cylinder portion having a recess that is screwed into the convex shape of the other helical tube, and an inner cylinder portion extending from the fitting cylinder portion,
The inner tubular part is slidably inserted in the direction in which the first pipe joint member and the second pipe joint member expand and contract with respect to the outer tubular part,
A pipe joint characterized in that a stopper stopper means is provided between the outer cylindrical part and the inner cylindrical part to restrict the inner cylindrical part from coming out of the outer cylindrical part.   3. The pipe joint according to claim 1, wherein the outer cylindrical portion and the inner cylindrical portion have screws that pass after being screwed together when the inner cylindrical shape is inserted into the outer cylindrical portion. A retaining portion is formed in the circumferential direction of the inner cylindrical portion at the end of the male thread provided in each of the inner cylindrical portions, and the retaining portion is formed on the female screw provided in the outer cylindrical portion. A pipe joint characterized by restricting the inner cylindrical portion from coming out of the outer cylindrical portion by contacting.   4. The pipe joint according to claim 3, wherein the threads of the outer cylindrical portion and the inner cylindrical portion are reverse screws formed in a direction opposite to the convex spiral direction of both the spiral tubes. Pipe fittings.

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