JP2009174598A - Tool for preventing movement of joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for preventing the movement of a joint capable of locking a lock claw of a lock portion with a peripheral surface of an insertion port without damaging the insertion port when both openings tend to move relative to each other. <P>SOLUTION: A lock portion 12 comprises a first lock claw 16a for locking the lock portion 12 with the peripheral surface of an insertion port by inclining the lock portion 12 inside of a recessed part in the case wherein both openings are being to be relatively moved in separating directions, in which both the openings are separated in the pipe axial direction, a second lock claw 16b to be locked with the peripheral surface of the insertion port when both the openings are being to be relatively moved in opposite directions each other, and an abutment portion 15 for transmitting reaction force to the first or the second lock claws 16a or 16b by abutting on the inner wall when the lock portion 12 is inclined. A cross-sectional shape of the lock portion 12 including the pipe axis is formed into a nearly symmetrical shape by arranging the abutment part 15 around a cross line D, which nearly crosses the pipe axis, on the cross line D or near there, and arranging both the claws 16a and 16b nearly symmetrically. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a pipe joint including an insertion portion that constitutes one fluid pipe and a receiving portion that constitutes the other fluid pipe into which the insertion portion is inserted, along the outer peripheral surface of the insertion portion. In addition, the present invention relates to a pipe joint movement preventing device that is provided on the receiving port side and prevents relative movement of both port portions in the tube axis direction.

  The conventional pipe joint movement preventing device is configured such that a locking portion having a locking claw is accommodated on the inner peripheral surface of a joint ring attached along the outer peripheral surface of the insertion portion. When an external force that tries to move away from each other acts, the locking claw locks against the outer peripheral surface of the insertion portion to counter this external force and prevent relative movement of both mouth portions. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 11-218276 (page 3, FIG. 5)

  However, in Patent Document 1, when a force to move relative to both mouth portions is generated, the locking claws are tilted by the tilting of the locking portion in order to counter this relative movement. In particular, in the case of both mouth portions constituting a so-called large-diameter pipe joint, the insertion portion may be damaged due to this.

  The present invention has been made paying attention to such a problem, and when the two mouth portions are going to move relative to each other, the locking claws of the locking portion can be inserted without damaging the insertion portion. It aims at providing the pipe joint movement prevention tool which can be latched to the outer peripheral surface of a mouth part.

In order to solve the above problems, a pipe joint movement preventing device according to claim 1 of the present invention is provided.
An insertion portion constituting one fluid pipe,
In a pipe joint comprising a receiving part that constitutes the other fluid pipe into which the insertion part is inserted,
A pipe joint movement preventing tool that is provided along the outer peripheral surface of the insertion portion and on the receiving portion side to prevent relative movement in the tube axis direction of the both opening portions,
A recess formed along the circumferential direction so as to face the outer peripheral surface of the insertion portion, and is accommodated along the recess, and the inner wall of the recess is used as a reaction force on the outer peripheral surface of the insertion portion. And at least a locking portion that locks,
The locking portion is
A first locking claw that tilts in the recess and locks to the outer peripheral surface of the insertion port when the two ports are about to move relative to each other in a separating direction that separates in the tube axis direction. When,
A second locking claw in which the locking portion tilts in the recess and locks to the outer peripheral surface of the insertion portion when the both mouth portions are to move relative to the direction opposite to the separation direction;
A contact portion that contacts the inner wall and transmits a reaction force to the first or second locking claw when the locking portion tilts,
The cross-sectional shape including the tube axis in the locking portion has the abutment portion disposed on or near the orthogonal line with the orthogonal line substantially orthogonal to the tube axis as the center, and the both claws are substantially symmetrical. It is characterized by a substantially symmetrical shape.
According to this feature, since the cross-sectional shape of the locking portion is arranged on or near the orthogonal line with the orthogonal line as the center, both the mouth parts are relative to the separation direction in the tube axis direction. When trying to move, and in any case of trying to move relatively in the direction opposite to the separation direction, using the inner wall of the recess as a reaction force by the contact portion arranged on the orthogonal line or in the vicinity thereof, The locking part tilts with a relatively small tilting radius, the locking claw appropriately bites into the outer peripheral surface of the insertion part, and locks into the insertion part, and the insertion opening resulting from excessive biting of the locking claw Damage to the part can be prevented. Moreover, since it is the substantially symmetrical shape which has arrange | positioned the 1st and 2nd latching claw substantially symmetrically, a latching | locking part can be tilted substantially symmetrically in any direction, and can exhibit substantially equivalent tilting force. In particular, for example, when bending occurs in a pipe joint including both mouth portions, both the mouth portions are separated from each other on the inner side where the bend is formed and the force that the both mouth portions relatively move in the separation direction on the outer side where the bending is formed. Even if the force to move relative to the direction opposite to the direction is continuously generated in the circumferential direction of both mouths, the same force is applied to both claws over the outer circumferential surface of the mouth part. By locking with force, relative movement of both mouth portions can be prevented in the circumferential direction.

The pipe joint movement preventing device according to claim 2 of the present invention is the pipe joint movement preventing device according to claim 1,
The contact portion is provided on the orthogonal line.
According to this feature, since the contact portion is provided on the orthogonal line located at the center of the locking portion having a substantially symmetrical shape, the tilt radius at which the locking portion tilts can be minimized. Also, when the locking part tilts in one direction when the both mouth parts try to move relatively in the separating direction, and when the locking part tilts in the opposite direction when the both mouth parts try to move relatively in the opposite direction to the separating direction In any case, an equivalent reaction force can be transmitted to the first or second locking claw by one contact portion provided on the orthogonal line.

The pipe joint movement preventing device according to claim 3 of the present invention is the pipe joint movement preventing device according to claim 1 or 2,
The contact portion becomes the center of the tilt diameter from the time when the locking portion starts tilting in the recess until the locking claw locks the outer peripheral surface of the insertion portion and finishes tilting. It is characterized by having a center point.
According to this feature, the center of the tilt diameter is not changed from when the locking portion starts tilting in the recess until the locking claw locks the outer peripheral surface of the insertion portion and finishes tilting. Since it tilts around one central point, the locking claw securely locks without damaging the outer peripheral surface of the insertion portion.

The pipe joint movement preventing device according to claim 4 of the present invention is the pipe joint movement preventing device according to any one of claims 1 to 3,
The concave portion is provided with a push screw which is screwed toward the tube axis and comes into contact with the contact portion.
According to this feature, the tilting angle of the locking portion when the push screw comes into contact with the abutment portion is adjusted by screwing the push screw provided in the recess appropriately toward the tube axis, and the insertion port The reaction force transmitted to the 1st or 2nd latching claw latched on the outer peripheral surface of a part can be adjusted.

  Examples of the present invention will be described below.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a cross-sectional view showing an overall image of a pipe joint movement preventing device in an embodiment of the present invention. FIG. 2 is a front view of the pipe joint movement preventing tool. Fig.3 (a) is a front view of a latching | locking part, (b) is a bottom view similarly. Fig.4 (a) is AA sectional drawing of Fig.3 (a), (b) is BB sectional drawing similarly. 5A to 5D are cross-sectional views sequentially showing the manner of tilting of the locking portion. 6A is a cross-sectional view of the locking portion of the present invention, FIG. 6B is a schematic view showing the same tilting magnitude of the locking portion as in FIG. It is sectional drawing of the conventional latching | locking part, (d) is the schematic which showed the magnitude | size of the tilting of the latching | locking part same as (c). FIG. 7 is a cross-sectional view showing the state of tilting of the locking portion when bending occurs in the pipe joint.

  As shown in FIG. 1, the pipe joint movement preventing device 10 of the present invention has an insertion port 2 that constitutes one fluid pipe 1 on the left side of the figure, and the insertion port 2 is inserted with the same tube axis. In a pipe joint provided with the receiving port 4 constituting the other fluid pipe 3, for example, when an unexpected external force such as an earthquake acts, or when an unbalanced force due to the fluid flowing in the pipe acts, This prevents the relative movement of both the mouth portions 2 and 4 in the direction of the tube axis C. In the illustrated pipe joint, a sealing member 5 is provided between the outer peripheral surface 2 a of the insertion portion 2 and the inner peripheral surface of the receiving portion 4 to prevent the fluid in the pipe from overflowing.

  When the above-described force is greatly applied, the convex portion 20 formed at the tip of the insertion portion 2 and the lock ring 6 accommodated in the groove portion 4a formed in the circumferential direction on the inner surface of the receiving portion 4; Are engaged to prevent the mouth portions 2 and 4 from coming out. Further, reference numeral 7 denotes a rubber ring that holds the lock ring 6 in a centered state, and reference numeral 8 denotes a ring that backs up the seal member 5.

  As shown in FIGS. 1 and 2, the pipe joint movement preventing device 10 includes a main body 11 that is an annular shape having a vertically divided structure in the figure, a locking portion 12 that is accommodated in the main body 11, and a locking portion. The push bolt 13 which mainly presses 12 to the outer peripheral surface 2a of the insertion part 2 to radial direction is comprised mainly. The main body 11 is attached along the outer peripheral surface 2 a of the insertion portion 2 in the vicinity of the outer end of the receiving portion 4, and is inserted through the bolt hole 11 a of the main body 11 and the bolt hole 4 b of the receiving portion 4. The bolt 14 is fixedly attached to the receiving portion 4. Further, by tightening the bolt 14 in the direction of the tube axis C, the pressing portion 11b formed on the receiving portion 4 side of the main body 11 presses the seal member 5 toward the inside of the receiving portion 4 to seal the seal. The water tightness of the member 5 is enhanced and the slipping out is prevented.

  The pipe joint movement preventing tool 10 will be described in detail. On the inner peripheral surface of the main body 11 facing the outer peripheral surface 2a of the insertion portion 2, there are a plurality of concave portions 17 extending in an arc shape in the circumferential direction at a predetermined interval. The locking portions 12 are accommodated along the recesses 17. The locking portion 12 includes locking claws 16, 16 extending at an acute angle toward the outer peripheral surface 2 a of the insertion portion 2, and the locking claws 16, 16 are the outer peripheral surface 2 a of the insertion portion 2 as will be described later. It is locked to the insertion part 2 by biting into the slot. Each recess 17 is provided with a push screw 13 screwed into the tube axis C, and the tip surface 13a of the push screw 13 can adjust the contact position with the locking portion 12. An inner wall on the bottom side of the recess 17 is formed.

  As shown in FIGS. 3A and 3B and FIGS. 4A and 4B, the locking portion 12 will be described. The locking portion 12 is a locking claw disposed on the inner peripheral side thereof. 16 extends in a substantially arc shape having a curved shape along the outer peripheral surface 2a of the insertion portion 2, and the first locking claw 16a and the second locking claw 16b are substantially parallel to this locking claw. And extending in the circumferential direction. Hereinafter, the locking claw on the side close to the receiving portion 4 will be referred to as a first locking claw 16a, and the locking claw on the side away from the receiving portion 4 will be described as a second locking claw 16b. Further, on the upper surface side of the engaging portion 12 accommodated in the recessed portion 17, there is an abutting portion 15 that contacts the inner wall on the bottom side of the recessed portion 17 and transmits a reaction force to the engaging claws 16 a or 16 b. It is formed on the center side except for both ends in the circumferential direction of the portion 12. Groove portions 12a and 12a are formed at both ends in the circumferential direction of the locking portion 12, and the rubber material 18 is accommodated in each groove portion 12a. Thus, the rubber material is disposed in the groove portions 12a and 12a at both ends. By accommodating the locking portion 12 provided with 18 and 18 in the concave portion 17, it is possible to prevent the locking portion 12 from dropping from the concave portion 17 using the elastic force of the rubber material 18.

  As shown in FIG. 4A, the cross-sectional shape at the center side in the circumferential direction of the locking portion 12 will be described. The cross-sectional view shape including the tube axis C in the locking portion 12 is substantially orthogonal to the tube axis C. The abutting portion 15 is disposed on the orthogonal line D with the orthogonal line D as a center, and the first locking claw 16a and the second locking claw 16b are formed in a substantially symmetrical shape on the right and left. ing. The left and right side surfaces of the locking portion 12 shown in the figure are tapered surfaces 12b, 12b that gradually bulge upward from both locking claws 16a, 16b located at the lower ends thereof. The abutting portion 15 is formed in a comparatively short, substantially horizontal straight line whose both ends are positioned in the vicinity of the orthogonal line D, and the both ends of the abutting portion 15 are locked as described later. Center points 15a and 15b which are the centers of the tilt diameters when the portion 12 tilts are arranged. Further, a taper-shaped non-contact portion 19 that gradually descends toward the end portion of the locking portion 12 is formed around the contact portion 15.

  Further, as shown in FIG. 4B, the cross-sectional shape of both ends of the locking portion 12 in the circumferential direction will be described. Both the locking claws 16a are centered on the orthogonal line D as in the above-described central side. , 16b are formed in a substantially symmetrical shape on the right and left sides, and the left and right side surfaces of the locking part 12 are tapered surfaces 12b, 12b gradually bulging upward from both locking claws 16a, 16b. It is made up. In addition, the upper surface of the locking portion 12 in the figure is formed in a substantially horizontal linear shape across the left and right ends. The abutting portion described above is not necessarily limited to the one disposed only on the center side of the locking portion, and may be disposed across both ends in the circumferential direction of the locking portion, for example.

  Next, as shown in FIGS. 5A to 5D, a manner of tilting the locking portion 12 will be described. Due to the above-described external force such as an earthquake or non-average force due to a fluid, a force that relatively moves in the direction of the tube axis C acts on the receiving portion 4 and the insertion portion 2. As an example, a case will be described in which the insertion portion 2 is about to move away from the receiving portion 4, that is, the left direction in the drawing.

  First, as shown in FIG. 5A, the locking portion 12 accommodated in the recess 17 is pressed toward the insertion portion 2 by the push bolt 13, and the locking claws 16a and 16b are inserted into the insertion portion. The outer peripheral surface 2a is locked with a predetermined pressing force. At this time, as described above, since the first locking claw 16a and the second locking claw 16b are arranged substantially symmetrically with the cross-sectional shape centering on the orthogonal line D, the locking portion 12 is inserted. The contact portion 15 and the outer peripheral surface 2a of the insertion portion 2 are positioned substantially parallel to each other without inclining to one side with respect to the outer peripheral surface 2a of the mouth portion 2. A predetermined gap is formed between the left and right tapered surfaces 12b, 12b of the locking portion 12 and the inner walls 17a, 17a on the left and right sides of the recess 17 in the figure.

  Next, as shown in FIG. 5B, in this state, the insertion portion 2 moves away from the receiving portion (not shown, but present on the right side), that is, moves to the left in the drawing. Accordingly, the locking portion 12 also moves to the left together with the insertion portion 2, and the upper portion of the left tapered surface 12 b of the locking portion 12 contacts the left inner wall 17 a of the recess 17.

  Then, as shown in FIG. 5 (c), as the insertion portion 2 moves to the left in the figure, the locking portion 12 rotates clockwise around the center point 15a at the left end of the abutment portion 15. Start tilting. Due to this tilting, the second locking claw 16 b is separated from the outer peripheral surface 2 a of the insertion portion 2, and the first locking claw 16 a is moved by the center point 15 a of the contact portion 15 that contacts the tip of the push bolt 13. The reaction force is transmitted and bites into the outer peripheral surface of the insertion portion 2, and the left tapered surface 12 b of the locking portion 12 abuts along the left inner wall 17 a of the recess 17.

  Then, as shown in FIG. 5D, as the insertion portion 2 further moves to the left in the drawing, the locking portion 12 tilts further clockwise around the center point 15a. By this tilting, the upper portion of the left tapered surface 12 b of the locking portion 12 is separated from the left inner wall 17 a of the recess 17, and the first locking claw 16 a to which the reaction force is further transmitted is the outer periphery of the insertion portion 2. The surface 2a further bites into and firmly locks, and the upper portion of the taper surface 12b on the right side of the locking portion 12 comes into contact with the inner wall 17a on the right side of the concave portion 17, and the tilting of the locking portion 12 ends.

  Thus, from the time when the locking portion 12 starts to tilt in the recess 17 (FIGS. 5B to 5C), the first locking claw 16a engages the outer peripheral surface 2a of the insertion portion 2. Until it stops and completes the tilting (FIG. 5 (d)), it tilts around one center point 15a without changing the center of the tilting diameter. Securely locks to the outer surface without damaging the surface.

  In addition, although not particularly illustrated, when the insertion portion 2 is to be further inserted inward of the receiving portion 4, that is, in a direction opposite to the above-described separation direction, the locking portion 12 is With the center point 15b at the right end of the contact portion 15 as the center, it tilts counterclockwise opposite to the clockwise direction shown in FIG. It bites into the outer peripheral surface of and locks.

  And the locking part when the pressing screw 13 and the contact part 15 contact | abut by adjusting the position of the front end surface 13a by screwing the pressing screw 13 provided in the recessed part 17 toward the pipe axis C suitably. The reaction force transmitted to the 1st or 2nd latching claw 16a, 16b latched to the outer peripheral surface 2a of the insertion part 2 can be adjusted by adjusting the inclination angle of 12.

  Further, the contact portion 15 is arranged on the orthogonal line D shown in FIG. 4A, and the center points 15a and 15b, which are the tilting centers of the locking portion 12, are located in the vicinity of the orthogonal line D. The locking portion 12 tilts with a relatively small tilt radius. Here, when the latching portion 12 according to the present invention is compared with the conventional latching portion, as shown in FIGS. 6C and 6D, the conventional latching portion 112 has the contact portion 115 engaged. The center point 115a, 115a ′, which is the center of tilting in the drawing, is the left end side of the top surface of the locking portion 112 and the tilting radius becomes large. The locking portion 112 (dotted line in the drawing) tilts and the locking claw 116a (shown solid line) bites into the outer peripheral surface of the insertion portion 2 to an excessive depth (depth in the drawing 2c). Further, the center point of the tilting of the locking portion 112 is further tilted from the center point 115a at the tilted position of the two-dot chain line in the drawing of the locking portion 112 with the magnitude of the tilt of the locking portion 112. The center of the tilt is moved to the center point 115a ′ at the tilted position of the solid line in FIG. 6, and the locking claw 116a greatly damages the outer peripheral surface of the slot 2 by the movement of the tilt center. 2 will be damaged.

  On the other hand, as shown in FIGS. 6 (a) and 6 (b), the locking portion 12 according to the present invention tilts with a relatively small tilt radius as described above. The portion 12 (dotted line in the figure) is tilted so that the locking claw 16a (solid line in the figure) bites into the outer peripheral surface of the insertion portion 2 to an appropriate depth (depth of 2b in the figure). The center point 15a of the tilt of 12 does not vary with the magnitude of the inclination of the locking part 12, and the locking claw 16a does not unnecessarily damage the outer peripheral surface of the insertion part 2, and firmly attaches to the insertion part 2. And lock.

  Next, for example, as shown in FIG. 7, the case where bending is about to occur in the pipe joint will be described. On the outer side (the upper side in the drawing) where the bending is formed, both the mouth portions 2 and 4 are relatively moved in the separation direction. Force to be generated is generated, and on the inner side (lower side in the drawing) forming the bend, a force is generated to relatively move both the mouth portions 2 and 4 in the direction opposite to the separating direction. In this case, on the upper side in the drawing, the first locking claw 16a of the locking portion 12 tilts clockwise in the drawing to prevent the relative movement in the separating direction of both the mouth portions 2 and 4, and on the lower side in the drawing. The second locking claw 16b of the locking part 12 tilts clockwise in the figure to prevent relative movement in the direction opposite to the separating direction of the two mouth parts 2 and 4. Here, the direction in which the two mouth portions 2 and 4 try to move relative to each other and the magnitude of the force to move relative to each other gradually vary along the circumferential direction of the both mouth portions 2 and 4, but along the circumferential direction. The plurality of locking portions 12 are tilted in such a manner that the direction of tilting and the magnitude of the tilting angle are appropriately changed, and both locking claws 16a and 16b are applied to any force. Is engaged with the same force over the outer peripheral surface of the insertion portion 2, thereby preventing relative movement of both the opening portions 2 and 4 in the circumferential direction.

  Note that the abutting portion of the locking portion is not necessarily limited to the one arranged on the orthogonal line D shown in FIG. 4A as in the present embodiment, but is arranged in the vicinity of the orthogonal line D. May be. For example, a pair of contact portions are arranged on both the left and right sides with an orthogonal line interposed therebetween, and a non-contact portion that is recessed more concavely than the contact portion is disposed between these contact portions, that is, on the orthogonal line. It may be.

  As described above, the contact portion 15 is arranged on or near the orthogonal line D with the orthogonal view D shown in FIG. For this reason, both the mouth portions 2 and 4 are arranged on the orthogonal line D in either case of relative movement in the separation direction in the tube axis C direction and in the case of relative movement in the direction opposite to the separation direction. The locking portion 12 is tilted with a relatively small tilt radius by using the inner wall on the bottom side of the recess 17 as a reaction force by the abutting portion 15, and the locking claws 16 a and 16 b are outer peripheral surfaces of the insertion portion 2. Therefore, the biting portion 2 is moderately bitten and locked to the insertion portion 2, and damage to the insertion portion 2 due to excessive biting of the locking claws can be prevented. Further, since the first and second locking claws 16a and 16b are substantially symmetrically arranged, the locking portion 12 tilts almost symmetrically in any direction, and substantially the same tilting force is obtained. Can demonstrate.

  Furthermore, since the contact part 15 is provided on the orthogonal line D located at the center of the substantially symmetrical locking part 12 as in the present embodiment, the tilt radius at which the locking part 12 tilts is set. Can be minimized. Further, when the locking portion 12 tilts in one direction as the both mouth portions 2 and 4 try to move relative to each other in the separating direction, the locking portion 12 tries to move relative to the both mouth portions 2 and 4 in the direction opposite to the separating direction. In either case of tilting in the opposite direction, the same reaction force can be transmitted to the first or second locking claws 16a, 16b by the one contact portion 15 provided on the orthogonal line D.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the taper-shaped non-contact portion 19 that gradually descends toward the end of the locking portion 12 is formed around the contact portion 15. However, the present invention is not necessarily limited to this. For example, a flat non-contact portion that is one step lower than the contact portion may be formed.

  Moreover, in the said Example, the push bolt 13 provided with the front end surface 13a which comprises the inner wall of the bottom side of the recessed part 17 is provided so that it can be suitably screwed in toward a pipe axis, and the function which adjusts the position of the front end surface 13a. However, the configuration of the inner wall on the bottom side of the recess is not necessarily limited to this, and may be formed in advance in a predetermined shape without having a push bolt, for example.

  In the above-described embodiment, the contact portion 15 is formed in a cross-sectional view line shape in which center points 15a and 15b serving as tilt centers are arranged at both ends, but the cross-sectional view shape of the contact portion is not necessarily the same. For example, it may be formed in a cross-sectional viewpoint including only the center point.

  Furthermore, in the above embodiment, the contact portion 15 is formed in a straight line shape in cross section, but the cross sectional view shape of the contact portion is not necessarily limited to this, for example, a convex shape that bulges outward, or It may be in the shape of a cross-sectional curve having a concave shape recessed inward.

  Moreover, in the said Example, although the recessed part 17 and the latching | locking part 12 were provided and the pipe joint movement prevention tool 10 separate from the receiving part 4 was attached with respect to the receiving part 4, a pipe joint movement The preventive tool is not necessarily limited to a separate body from the receiving part, and for example, a recess may be formed along the circumferential direction on the inner peripheral surface of the receiving part, and the engaging part may be accommodated in the recessed part. .

It is sectional drawing which shows the whole image of the pipe joint movement prevention tool in the Example of this invention. It is a front view of a pipe joint movement prevention tool. (A) is a front view of a latching | locking part, (b) is a bottom view similarly. (A) is AA sectional drawing of Fig.3 (a), (b) is BB sectional drawing similarly. (A)-(d) is sectional drawing which showed the aspect of the inclination of a latching | locking part one by one. (A) is sectional drawing of the latching | locking part of this invention, (b) is the schematic which showed the magnitude | size of the tilting of the latching | locking part same as (a), (c) is the conventional It is sectional drawing of a latching | locking part, (d) is the schematic which showed the magnitude | size of the tilting of the latching | locking part same as (c). It is sectional drawing which showed the condition of the inclination of the latching | locking part when bending generate | occur | produces in a pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 One fluid pipe 2 Insertion part 2a Outer peripheral surface 3 Other fluid pipe 4 Receiving part 10 Pipe joint movement prevention tool 12 Locking part 13 Push screw 13a Tip surface (inner wall)
15 Contact portions 15a, 15b Center point 16a First locking claw 16b Second locking claw 17 Recessed portion 17a Inner wall

Claims (4)

An insertion portion constituting one fluid pipe,
In a pipe joint comprising a receiving part that constitutes the other fluid pipe into which the insertion part is inserted,
A pipe joint movement preventing tool that is provided along the outer peripheral surface of the insertion portion and on the receiving portion side to prevent relative movement in the tube axis direction of the both opening portions,
A recess formed along the circumferential direction so as to face the outer peripheral surface of the insertion portion, and is accommodated along the recess, and the inner wall of the recess is used as a reaction force on the outer peripheral surface of the insertion portion. And at least a locking portion that locks,
The locking portion is
A first locking claw that tilts in the recess and locks to the outer peripheral surface of the insertion port when the two ports are about to move relative to each other in a separating direction that separates in the tube axis direction. When,
A second locking claw in which the locking portion tilts in the recess and locks to the outer peripheral surface of the insertion portion when the both mouth portions are to move relative to the direction opposite to the separation direction;
A contact portion that contacts the inner wall and transmits a reaction force to the first or second locking claw when the locking portion tilts,
The cross-sectional shape including the tube axis in the locking portion has the abutment portion disposed on or near the orthogonal line with the orthogonal line substantially orthogonal to the tube axis as the center, and the both claws are substantially symmetrical. A pipe joint movement preventing device having a substantially symmetrical shape.   The pipe joint movement preventing tool according to claim 1, wherein the contact portion is provided on the orthogonal line.   The contact portion becomes the center of the tilt diameter from the time when the locking portion starts tilting in the recess until the locking claw locks the outer peripheral surface of the insertion portion and finishes tilting. The pipe joint movement preventing device according to claim 1 or 2, characterized by having a center point.   The pipe joint movement preventing device according to any one of claims 1 to 3, wherein the concave portion is provided with a push screw which is screwed toward the tube axis and comes into contact with the contact portion.

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