JP2007303533A - Joint structure of pipe joint and pipe body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of preventing a nut from being loosened at each pipe joint. <P>SOLUTION: The nut 2 is provided on the outer peripheral face of the lower end of a joint body 1 so as to rotate in a state for preventing the nut 2 from coming off. A shielding member 3 is movably provided in the joint main body 1 so as to be turnable. The shielding member 3 is formed to shield the whole nut 2 when it is positioned at a shielding position where its annular protruding part 3a is butted on the upper end face of the nut 2. A stopper member 4 for maintaining the shielding member 3 at the shielding position is detachably provided in the joint body 1 on the upper side of the shielding member 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint for connecting a pipe body such as a gas pipe and a pipe joint structure for connecting first and second pipe bodies.

  In general, when the primary side gas pipe and the secondary side gas pipe are connected to the inlet and outlet of the gas meter, respectively, between the primary side gas pipe and the inlet of the gas meter, and between the secondary side gas pipe and the gas meter. The outlet is connected to each other via a joint. The joint has a joint main body having a male threaded portion at one end and a nut rotatably provided at the other end of the joint main body. The male thread portion of the joint body is screwed to the downstream end portion of the primary side gas pipe. The nut is screwed into the inlet of the gas meter. As a result, the primary gas pipe is connected to the inlet of the gas meter. Similarly, the secondary gas pipe is connected to the outlet of the gas meter.

  By the way, during various operations such as a gas piping operation, tools may be accidentally hit against the outer peripheral surface of the nut. In this case, if the nut has a circular cross-section, it will hardly be rotated by the impact when the tools are hit, but the outer periphery of the nut is a spanner hook for engaging the spanner when tightening the nut. The spanner hanging portion has a plurality of flat portions. When tools collide with this plane, the impact may cause the nut to rotate and loosen.

  Therefore, the following Patent Document 1 proposes a joint loosening prevention structure. This loosening prevention structure has a band provided with two engaging portions that engage non-rotatably with the spanner hanging portion of each joint. This band is hung between two joints in a state where each engaging portion is engaged with the spanner hooking portion. As a result, the rotation of each joint is prevented and the occurrence of looseness is prevented.

Japanese Patent Laid-Open No. 9-53626

  The above-described loosening prevention structure cannot be used unless two joints are arranged adjacent to each other, and there is a problem that loosening cannot be prevented when there is only one joint. This is because when there is only one joint, even if the band is wound around the joint, the band rotates together with the joint.

In order to solve the above problem, a first aspect of the present invention includes a cylindrical joint body having a threaded portion formed at least at one end thereof, and a tool hook portion having a flat surface on the outer peripheral portion of the joint body. In the provided pipe joint, on the outer peripheral surface of the joint body, there is a space between a shield position where the shield member is rotatable and the tool hook portion is shielded and an exposed position where the tool hook portion is exposed to the outside. A stopper member that is provided so as to be movable in the axial direction of the joint body and that prevents the shielding member from moving from the shielding position to the exposed position side is detachably provided, and the shielding member serves as the tool hook portion. It is characterized by being able to rotate with respect to.
In this case, it is desirable that a nut is rotatably provided on the outer periphery of the other end of the joint body, and the tool hook is formed on the outer peripheral surface of the nut.
The stopper member is formed in a substantially “C” shape, and the stopper member is elastically deformed by itself to expand the open portion thereof, so that the outer peripheral surface of the joint body has one radial direction. It is desirable to be detachable from the side. It is desirable that the stopper member is formed with a protruding portion that protrudes radially outward on an outer peripheral portion opposite to the opening portion. It is desirable that a weakened portion is provided at a base end portion of the protruding portion, and the protruding portion can be broken at the weakened portion.
The stopper member has first and second stopper pieces that are rotatably connected to each other at one end, and the first and second stopper pieces are arranged on the outer peripheral surface of the joint body in the radial direction. It is desirable to be able to rotate between an open position that can be inserted / removed from the side and a closed position that engages with the outer peripheral surface of the joint body so as not to move in the axial direction of the joint body. It is desirable that the first and second stopper pieces are fixed at the closed position by connecting the other end portions of the first and second stopper pieces so as to be detachable by a lock member.

In order to solve the above-described problem, the second aspect of the present invention includes a first and second tubular body in which ends adjacent to each other are arranged in a straight line, and the first of the first tubular body. A nut provided rotatably at one end of the two-pipe body side, and a tool-hanging portion having a flat surface is formed on the outer peripheral surface of the nut, and the nut is formed on the first pipe side of the second pipe body. In the joint structure of the tubular body in which the first and second tubular bodies are connected to each other by being screwed to one end, a shielding member is rotatable on the outer peripheral surface of the second tubular body and the nut. Between the shield position where the tool hook portion is shielded and the exposed position where the tool hook portion is exposed to the outside, is provided so as to be movable in the axial direction of the joint body, and the shield member is moved from the shield position to the above position. Stopper member that prevents movement to the exposed position side Detachably provided, the shielding member is characterized in that is rotatable relative to the tool-engaging portion.
In this case, the stopper member is formed in a substantially “C” shape, and the stopper member is elastically deformed by itself and expands the open portion thereof, whereby the outer peripheral surface of the second tubular body. In addition, it is desirable to be detachable from one side in the radial direction. It is desirable that the stopper member is formed with a protruding portion that protrudes radially outward on an outer peripheral portion opposite to the opening portion. It is desirable that a weakened portion is provided at a base end portion of the protruding portion, and the protruding portion can be broken at the weakened portion.
The stopper member has first and second stopper pieces that are pivotally connected to each other at one end, and the first and second stopper pieces are arranged radially on the outer peripheral surface of the second tubular body. It is possible to rotate between an open position that can be inserted / removed from one side portion and a closed position that engages with the outer peripheral surface of the second tubular body in the axial direction of the second tubular body. It is desirable. It is desirable that the first and second stopper pieces are fixed in the closed position by connecting the other end portions of the first and second stopper pieces so as to be detachable by a lock member.

  According to this invention which has the said structure, when the shielding member is located in the shielding position, the plane of a tool hanging part is shielded by the shielding member. Therefore, during piping work or the like, various tools do not hit the plane of the tool hanging portion, and the tools hit the shielding member. Since the shielding member can be rotated with respect to the tool hanging portion, the tool hanging portion is not rotated even if the shielding member is turned by the tools hitting the shielding member. Therefore, it is possible to reliably prevent looseness between the joint and the pipe connected thereto or between the connected pipes.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 6 show a first embodiment of the invention according to the first aspect. As shown in FIGS. 1 to 3, the pipe joint A of this embodiment includes a joint body 1, a nut 2, a shielding member 3, and a stopper member 4 as main components.

  The joint body 1 has a cylindrical shape with both ends opened, and a tapered male thread portion is provided at one end portion of the outer peripheral surface (the upper end portion in FIG. 3; 1a is formed. Instead of the taper male screw portion 1a, a straight male screw portion or a female screw portion may be formed on the inner peripheral surface of the upper end portion of the joint body 1. A first annular groove 1 b is formed at the lower end of the joint body 1. A metal retaining ring 5 is fitted in the first annular groove 1 b so as not to move in the axial direction of the joint body 1. A second annular groove 1c is formed on the outer peripheral surface of the joint body 1 at a predetermined distance above the first annular groove 1b.

  The nut 2 has a cylindrical shape, and the length thereof is shorter than that of the joint body 1. An annular protrusion 2 a is formed at the upper end of the inner peripheral surface of the nut 2. The annular protrusion 2 a is fitted to the outer peripheral surface of the joint body 1 so as to be rotatable and movable in the axial direction of the joint body 1. However, when the annular projecting portion 2 a hits the retaining ring 5, it can no longer move downward. Thereby, the nut 2 is prevented from coming off from the joint body 1 downward. Hereinafter, the position of the nut 2 at this time is referred to as a locking position. As is apparent from this, a retaining mechanism is constituted by the retaining ring 5 and the annular projecting portion 2a. The nut 2 can be inserted into the outer periphery of the joint body 1 from either the upper end or the lower end before the retaining ring 5 is mounted, and can be inserted from the upper end after the retaining ring 5 is mounted. is there.

  A female thread portion 2b is formed on the inner peripheral surface of the nut 2 on the lower end side from the annular projecting portion 2a. The female screw portion 2b is a straight screw having a constant diameter, but a tapered female screw portion may be formed instead. When the nut 2 is positioned at the locking position, at least the lower end portion of the female screw portion 2 b is positioned below the joint body 1.

  As shown in FIGS. 5 and 6, a spanner hook (tool hook) 2 c is formed on the outer peripheral surface of the nut 2. The spanner hanging portion 2 c has a regular hexagonal cross section and has six planes 2 d parallel to the axis of the nut 2. When the nut 2 is tightened with a spanner (not shown), the spanner is engaged with any two planes 2d, 2d spaced 180 ° in the circumferential direction of the nut 2. Then, the nut 2 is tightened by turning the spanner. The spanner hook 2c may have an octagonal cross section, or may have only two planes parallel to each other, and the two planes may be arranged 180 degrees apart in the circumferential direction of the nut 2. . Further, when a special tool is used instead of a spanner as a tool for rotating and tightening the nut 2, only one plane 2d may be formed.

  The shielding member 3 has a cylindrical shape, and an annular protrusion 3a is formed at the upper end portion of the inner peripheral surface thereof. The annular protrusion 3a is fitted on the outer peripheral surface of the joint body 1 so as to be rotatable and movable in the vertical direction. Therefore, the shielding member 3 is rotatable and movable with respect to the joint body 1. However, when the annular projecting portion 3a hits the upper end surface of the nut 2 positioned at the locking position, the shielding member 3 can no longer move downward. The position of the shielding member 3 at this time is the shielding position.

  The inner diameter of the lower part of the shielding member 3 from the annular protrusion 3 a is larger than the outer diameter of the nut 2, and the length of the lower part is longer than the entire length of the nut 2. Accordingly, when the shielding member 3 is located at the shielding position, the whole nut 2 is shielded. Moreover, the shielding member 3 is rotatable with respect to the nut 2.

  The stopper member 4 is made of a metal flat plate. As shown in FIG. 2, the stopper portion 4 has a "C" -shaped fitting portion 4a in plan view and an outer periphery opposite to the opening portion 4b of the fitting portion 4a. And a projecting portion 4c projecting radially outward from the surface.

  The fitting portion 4a can be elastically deformed so that its diameter increases until the width of the opening portion 4b becomes substantially equal to or larger than the inner diameter of the second annular groove 1c. Therefore, the fitting part 4a can be fitted into the second annular groove 1c from one side in the radial direction toward the other side by expanding the diameter, and moves vertically in the second annular groove 1c. It is impossible to fit. In this state, the lower surface of the fitting portion 4a is substantially in contact with the upper end surface of the shielding member 3 located at the shielding position. As a result, the shielding member 3 and the nut 2 are fixed by the stopper member 4 and the retaining ring 5 so as to be substantially immovable at the shielding position and the locking position, respectively.

  The fitting portion 4a can be removed from the second annular groove 1c in the radial direction by expanding the diameter. When the protruding portion 4c is pulled outward in the radial direction of the fitting portion 4a, the fitting portion 4a is The diameter is increased by the bottom surface of the second annular groove 1c, and the fitting portion 4a can be detached from the second annular groove 1c. When the fitting portion 4a is removed, that is, when the stopper member 4 is removed from the second annular groove 1c, the shielding member 3 can move upward from the shielding position. When the shielding member 3 is moved upward by a predetermined distance or more from the locking position, the spanner hanging portion 2c is exposed to the outside. The position of the shielding member 3 at this time is an exposure position. In a state where the shielding member 3 is located at the exposed position, the nut 2 can be rotated by hooking the spanner hooking portion 2c with the spanner. When the stopper member 4 is removed from the second annular groove 1c, the nut 2 can be moved upward from the locking position.

  As shown in FIG. 2, a weakening line (weakening portion) 4 d that crosses the protrusion 4 c in the width direction is formed at the base end portion of the protrusion 4 c. The weakening line 4d is made of a slit or the like, and the protrusion 4c can be broken from the weakening line 4d by bending the protrusion 4c from the weakening line 4d. The protrusion 4c can be easily bent by hand from the weakening line 4d. When the protruding portion 4c is broken from the weakening line 4d, the protruding amount of each portion of the stopper portion 4 from the second annular groove 1c becomes small, so that the stopper member 4 cannot be removed from the second annular groove 1c by hand. , Will be removed with a dedicated tool. Therefore, the mischief which removes the stopper member 4 can be prevented by fracture | rupturing the protrusion part 4c.

  Next, the procedure in the case of connecting the primary side gas pipe G1 and the inlet Ma of the gas meter M using the joint A having the above configuration will be described. The secondary side gas pipe G2 (see FIG. 17) and the outlet Mb of the gas meter M can be connected by the same procedure by the joint A.

  When connecting the primary side gas pipe G1 and the introduction port Ma of the gas meter M using the joint A, first, as shown in FIG. 4, the joint main body is connected to the downstream end facing the lower side of the primary side gas pipe G1. One male screw portion 1a is screwed and fixed. In this case, the joint body 1 can be rotated by engaging a wrench with an intermediate portion between the male screw portion 1 a and the shielding member 3.

  Next, the stopper member 4 is removed from the joint body 1, and the shielding member 3 is moved to the exposed position as shown in FIG. Thereafter, the stopper member 4 is fitted into the second annular groove 1c. Here, the outer diameter of the fitting portion 4 a of the stopper member 4 is smaller than the inner diameter of the lower portion of the shielding member 3 than the annular projecting portion 3 a, but the projecting portion 4 c hits the lower end surface of the shielding member 3. Therefore, the shielding member 3 is held at the exposed position by the stopper member 4.

  When the shielding member 3 is positioned at the exposed position, the spanner hook 2c of the nut 2 is exposed. Therefore, after the nut 2 is screwed into the introduction port Ma of the gas meter M by hand, the spanner is engaged with the spanner hook 2c and the nut 2 is tightened, and the joint body 1 and the introduction port Ma are connected via the nut 2. Connecting.

  Next, the stopper member 4 is removed from the second annular groove 1c again, and as shown in FIG. 6, the shielding member 3 is moved downward until the annular protrusion 3a hits the upper end surface of the nut 2, that is, to the shielding position. . Thereafter, the stopper member 4 is fitted into the second annular groove 1c. As a result, the shielding member 3 is fixed to the shielding position. Thereafter, the protrusion 4c is broken from the weakening line 4d.

  In the connection state shown in FIG. 6, the spanner hooking portion 2 c of the nut 2 is shielded by the shielding member 3, so that tools do not hit the flat surface 2 d of the spanner hooking portion 2 c. Therefore, the nut 2 is not rotated thereby. Of course, tools may come into contact with the shielding member 3 and thereby the shielding member 3 may be rotated. However, since the shielding member 3 can rotate with respect to the nut 2, even if the shielding member 3 rotates. The nut 2 does not rotate. Therefore, it is possible to reliably prevent the nut 2 from loosening. Moreover, since the shielding member 3 shields the nut 2 and rotates with respect to the nut 2 to prevent the rotation of the nut 2, the rotation of the nut 2 can be prevented independently.

  Next, another embodiment of the present invention will be described. In addition, regarding the following embodiment, only a different structure from the said embodiment is demonstrated, the same code | symbol is attached | subjected to the structure similar to the said embodiment, and the description is abbreviate | omitted.

  7 to 11 show a second embodiment of the invention according to the first aspect. In the pipe joint B of this embodiment, a stopper member 4A is used instead of the stopper member 4. The stopper member 4A is made of a resin that is relatively hard but is more easily elastically deformed than metal, and the width of the opening 4b of the fitting portion 4a is narrower than that of the opening 4b of the stopper member 4. Arm portions 4e and 4f are formed at both ends of the fitting portion 4a desired for the opening portion 4b and project outward in parallel to each other in the radial direction. At the tip of one arm 4e, an overlapping portion 4g that overlaps with the tip of the other arm 4f is formed. Through holes 4h and 4i having the same axis line are formed in the overlapping portion 4g and the tip of the arm portion 4f, respectively.

  The stopper member 4A can expand the diameter of the fitting portion 4a by separating the pair of arm portions 4e and 4f from each other. In this state, the fitting portion 4a can be attached to and detached from the second annular groove 1c. After the fitting portion 4a is mounted in the second annular groove 1c, the stopper member 4A is inserted into the through holes 4h, 4i by inserting a metal wire (lock member) or a resin wire (lock member) W and binding them. The two annular grooves 1c can be made non-removable. In addition, a lock can be used instead of the resin wire W.

12 to 16 show a third embodiment of the invention according to the first aspect. In the pipe joint C of this embodiment, a stopper member 4B is used instead of the stopper member 4. In this stopper member 4B, the fitting portion 4a is composed of _first and second fitting portion halves 4a ₁ and 4a ₂ that are separate from each other, and the first and second fitting portion halves 4a _{1 are included.} , 4a ₂ are connected so that ends located on the opposite side of the opening 4b can be rotated. In this stopper member 4C, as shown in FIG. 16, the opening portion 4b is made larger than the inner diameter of the second annular groove 1c by rotating the first and second fitting portion halves 4a ₁ and 4a ₂ to the open position. Since it can be opened, the stopper member 4 can be easily attached to and detached from the second annular groove 1c. Of course, as shown in FIG. 15, by turning the first and second fitting portion halves 4a ₁ and 4a ₂ to the closed position, the first and second fitting portion halves 4a ₁ and 4a ₂ are moved. The second annular groove 1c can be fitted so as not to move in the axial direction of the joint body 1. In this embodiment, a first stopper piece is constituted by the first fitting part half body 4a ₁ and the arm part 4e, and a second stopper piece is constituted by the second fitting part half body 4a ₂ and the arm part 4f. Has been.

  17 to 19 show a fourth embodiment of the invention according to the first aspect. In the pipe joint D of this embodiment, a stopper member 4C common to the two pipe joints D and D is used. That is, as shown in FIG. 17, a pipe joint D for connecting the primary side gas pipe G1 and the inlet port Ma of the gas meter M and a secondary side gas pipe G2 and the outlet port Mb of the gas meter M are connected. One stopper member 4C is shared by the pipe joint D. In the stopper member 4C, the arm portions 4e and 4f are elongated, and semi-fitting portions 4j and 4k each having a substantially semicircular shape are formed at an intermediate portion thereof. The fitting portion 4a is fitted into the second annular groove 1c of the pipe joint D connected to the outlet port Ma, and the semi-fitting portions 4j and 4k are the second of the pipe joint D connected to the outlet port Mb. It is made to fit in the annular groove 1c. In this pipe joint D, since the two pipe joints D and D share one stopper member 4C, the number of parts can be reduced, and thereby the manufacturing cost of the pipe joint D can be reduced.

  20 and 21 show an embodiment of the invention according to the second aspect. In the joint structure of a tubular body of this embodiment, two tubular bodies 11 and 12 arranged in a straight line are connected by a nut 13, and the nut 13 is shielded to prevent the nut 13 from rotating. It is made to shield by.

  One end portion of the outer peripheral surface of one tube body 11 spaced from the tube body 12 (left end portion in FIGS. 20 and 21; hereinafter, left and right mean left and right in FIGS. 20 and 21) is tapered. A male screw portion 11a is formed. A straight male screw part or female screw part may be formed instead of the taper male screw part 11a. A retaining ring 15 is fitted and fixed to the right end portion of the outer peripheral surface of the tubular body 11, and a nut 13 is fitted. An annular protrusion 13 a is formed at the left end of the nut 13. The annular protrusion 13a is fitted to the outer peripheral surface of the tube body 11 so as to be rotatable and movable in the left-right direction. As a result, the nut 13 is rotatable and movable with respect to the tube body 11. However, the nut 13 cannot move further to the right when the annular protrusion 13a hits the retaining ring 15. The position of the nut 13 at this time is a locking position. Accordingly, in this embodiment, the annular protrusion 13a and the retaining ring 15 constitute a retaining mechanism. On the outer peripheral surface of the nut 13, a spanner hook (tool hook) 13 b is formed. The spanner hanging portion 13b is formed in a hexagonal cross section, an octagonal cross section, or a shape having two parallel surfaces, as in the spanner hanging portion 2c of the above-described embodiment.

  A tapered male screw portion 12 a is formed at the right end portion of the other tube body 12. A straight male screw part or female screw part may be formed instead of the taper male screw part 12a. A tapered male screw portion (male screw portion) 12 b is formed at the left end portion of the tube body 12. The first and second tubular bodies 11 and 12 are connected via the nut 13 by screwing and tightening the nut 13 to the tapered male screw portion 12 b. A straight male screw portion may be formed instead of the tapered male screw portion 12b. In that case, when the nut 13 is screwed into the male screw portion and tightened, the adjacent end portions of the tubular bodies 11 and 12 abut each other via a packing (not shown).

  A cylindrical shielding member 14 is fitted to the left end portion of the tube body 12. An annular protrusion 14 a is formed at the right end of the shielding member 14. The annular protrusion 14 a is fitted on the outer peripheral surface of the tube body 12 so as to be rotatable and movable in the axial direction of the tube body 12. Thereby, the shielding member 14 is rotatable and movable with respect to the tube body 12. However, when the shielding member 14 hits the annular protrusion 12c formed at the left end portion of the outer peripheral surface of the tubular body 12, it cannot move further to the left. The position of the shielding member 14 at this time is the shielding position. When the shielding member 14 is located at the shielding position, the shielding member 14 covers the entire nut 13 located at the locking position. Therefore, in the state where the nut 13 is located at the locking position and the shielding member 14 is located at the shielding position, the spanner hook 13b is not exposed to the outside.

  An annular groove 12 d is formed in the middle portion of the outer peripheral surface of the tube body 12. A stopper member 16 is detachably fitted in the annular groove 12d and cannot move in the left-right direction. As the stopper member 16, any of the stopper members 4, 4A, 4B, and 4C of the above-described embodiments can be used. The stopper member 16 is substantially in contact with the right end surface of the shielding member 14 located at the shielding position. Therefore, in a state where the stopper member 16 is fitted in the annular groove 12d, the shielding member 14 is fixed to the shielding position so as to be hardly movable. Conversely, when the stopper member 16 is removed from the annular groove 12d, the shielding member 14 can be moved to the right from the shielding position, and can be moved to the exposed position where the spanner hooking portion 13b of the nut 13 is exposed to the outside. .

  In the joint structure of the tubular body described above, when the two tubular bodies 11 and 12 are connected, the stopper member 16 is removed from the tubular body 12 and the shielding member 14 is positioned at the exposed position. First, the tubular bodies 11 and 12 are connected by the nut 13. Next, the shielding member 14 is moved to the shielding position. Thereafter, the stopper member 16 is fitted into the annular groove 12d. Thereby, the shielding member 14 is maintained in the shielding position.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the joints A to D of the above-described embodiment, the nut 2 is provided in the joint body 1 and the spanner hanging portion 2 c is formed on the nut 2. While forming the external thread part instead of a part, you may form a spanner hook part in the outer peripheral surface of the coupling main body 1 adjacent to the other end side with respect to this external thread part.

It is a front view which shows 1st Embodiment of the invention which concerns on a 1st aspect. It is a top view of the embodiment. It is a front sectional view of the same embodiment. It is a front view which shows the state by which the coupling main body of the embodiment was connected to the primary side gas pipe. It is a front view which shows a state when screwing the nut of the same embodiment into the inlet of a gas meter. It is a front view which shows the state which connected the primary side gas pipe and the inlet port of the gas meter using the coupling of the embodiment. It is a front sectional view showing a 2nd embodiment of the invention concerning the 1st mode. It is a top view which shows the stopper member used in the same embodiment. It is a front view which shows the stopper member. It is a bottom view which shows the stopper member. It is a front view which shows the state which connected the primary side gas pipe and the inlet port of the gas meter using the coupling of the embodiment. It is a front view which shows 3rd Embodiment of the invention which concerns on a 1st aspect. It is a top view which shows the same embodiment. It is a front sectional view showing the same embodiment. It is a top view which shows the stopper member used in the embodiment in the state which closed the open part. It is a top view which shows the stopper member in the state which opened the open part. It is a front view which shows 4th Embodiment of the invention which concerns on a 1st aspect. It is a top view which shows the stopper member used in the embodiment in the state which closed the open part. It is a top view which shows the stopper member in the state which opened the open part. It is a front view which shows one Embodiment of the invention which concerns on a 2nd aspect. It is a front sectional view showing the same embodiment.

Explanation of symbols

A Pipe joint B Pipe joint C Pipe joint D Pipe joint W Resin wire (locking member)
1 Joint body 2 Nut 2a Annular protrusion 2c Spanner hook (tool hook)
2d Plane 3 Shielding member 4 Stopper member 4b Opening portion 4c Protruding portion 4d Weak line (weakening portion)
11 1st pipe body 12 2nd pipe body 12b Taper male thread part (male thread part)
13 Nut 13b Spanner hook (tool hook)
14 shielding member 14a annular protrusion 16 stopper member

Claims (13)

In a pipe joint provided with a cylindrical joint body formed with a threaded portion at least at one end, and provided with a tool hook portion having a flat surface on the outer periphery of the joint body,
On the outer peripheral surface of the joint body, an axis between the shield position where the shield member is rotatable and the tool hook portion is shielded and the exposed position where the tool hook portion is exposed to the outside is provided in the axial direction of the joint body. A stopper member that is provided so as to be movable and prevents the shielding member from moving from the shielding position to the exposed position side is detachably provided, and the shielding member is rotatable with respect to the tool hooking portion. A pipe joint characterized by being. The pipe joint according to claim 1, wherein a nut is rotatably provided on an outer periphery of the other end of the joint body, and the tool hook is formed on an outer peripheral surface of the nut. The stopper member is formed in a substantially “C” shape, and the stopper member is elastically deformed by itself to expand the open portion thereof, so that the outer peripheral surface of the joint body has one radial direction. The pipe joint according to claim 1, wherein the pipe joint is detachable from a side part.   4. The pipe joint according to claim 3, wherein the stopper member is formed with a projecting portion projecting radially outward at an outer peripheral portion opposite to the open portion. 5. The pipe joint according to claim 4, wherein a weakened portion is provided at a base end portion of the protruding portion, and the protruding portion can be broken at the weakened portion. The stopper member has first and second stopper pieces that are rotatably connected to each other at one end, and the first and second stopper pieces are arranged on the outer peripheral surface of the joint body in the radial direction. It is possible to rotate between an open position that can be inserted / removed from a side portion and a closed position that engages with the outer peripheral surface of the joint body so as not to move in the axial direction of the joint body. The pipe joint according to 1 or 2. The other end portions of the first and second stopper pieces are detachably connected by a lock member, whereby the first and second stopper pieces are fixed at the closed position. Item 7. The pipe joint according to Item 6. A first and a second tubular body in which ends adjacent to each other are arranged in a straight line, and a nut rotatably provided at one end of the first tubular body on the second tubular body side, A tool hooking portion having a flat surface is formed on the outer peripheral surface of the nut, and the first and second tubes are connected to each other by screwing the nut into one end of the second tube on the first tube side. In the joint structure of connected pipes,
On the outer peripheral surface of the second tubular body, the shielding member is rotatable and between the shield position where the tool hook portion of the nut is shielded and the exposed position where the tool hook portion is exposed to the outside. A stopper member is provided to be movable in the axial direction of the joint body, and a stopper member that prevents the shielding member from moving from the shielding position to the exposed position side is detachable, and the shielding member is attached to the tool hook portion. A tubular joint structure characterized by being rotatable relative to the tube. The stopper member is formed in a substantially “C” shape, and the stopper member elastically deforms itself and expands an opening portion thereof, whereby the diameter of the stopper member is increased on the outer peripheral surface of the second tubular body. 9. The tubular joint structure according to claim 8, wherein the tubular joint structure is removable from one side of the direction. 10. The tubular joint structure according to claim 9, wherein the stopper member has a projecting portion projecting radially outward at an outer peripheral portion opposite to the open portion. 11. The tubular joint structure according to claim 10, wherein a weakened portion is provided at a base end portion of the protruding portion, and the protruding portion can be broken at the weakened portion. The stopper member has first and second stopper pieces that are pivotally connected to each other at one end, and the first and second stopper pieces are arranged radially on the outer peripheral surface of the second tubular body. It is possible to rotate between an open position that can be inserted / removed from one side portion and a closed position that engages with the outer peripheral surface of the second tubular body in the axial direction of the second tubular body. The pipe joint structure according to claim 8. The other ends of the first and second stopper pieces are detachably connected by a lock member, whereby the first and second stopper pieces are fixed in the closed position. The joint structure for a tubular body according to claim 12.

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