Joint

Abstract

To reduce labor needed for connection between objects to be connected even when it is difficult to adjust a distance between the objects to be connected.SOLUTION: A joint 10 includes: a cylinder part 20 forming a passage; and a cylinder connection part 22. The cylinder connection part 22 connects the cylinder part 20 to a gas meter connection port 220. The connection allows a passage of the cylinder part 20 to communicate with a space different from the passage. The cylinder part 20 has one cylinder body 30, the other cylinder body 32, and a change part 34. The one cylinder body 30 has a cylindrical shape. One end of the one cylinder body 30 may enter the other cylinder body 32. The other cylinder body 32 has a cylindrical shape. The change part 34 changes an entry amount of the one end of the one cylinder body 30 which enters the other cylinder body 32 when the one end of the one cylinder body 30 enters the other cylinder body 32. The cylinder connection part 22 is engaged with the other end of the one cylinder body 30 so as to enable movement in a direction along an axis of the one cylinder body 30 and rotation along an outer periphery of the one cylinder body 30.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a joint. [Background technology]

[0002] Patent Document 1 discloses a union joint. This union joint includes a tubular nozzle, a gas pipe, and a union nut. The nozzle protrudes upward from a gas meter. The nozzle has a male thread on its radial outer periphery. The gas pipe is located above the nozzle. The gas pipe has a flange on its radial outer periphery. The union nut has a female thread and a protrusion. The female thread can engage with the male thread of the nozzle. The protrusion protrudes toward the shaft on its radial inner periphery. The protrusion engages with the flange of the gas pipe. The nozzle and gas pipe are connected by a union nut. The flange is a C-shaped member with a cut portion. The flange is fitted into an annular groove on the outer periphery of the gas pipe. The flange can be attached and detached by elastic deformation. The minimum inner diameter of the union nut is formed to be larger than the maximum outer diameter of the gas pipe excluding the flange. A waterproof member is provided to seal the gap between the outer periphery of the gas pipe and the inner periphery of the union nut.

[0003] The union joint disclosed in Patent Document 1 can improve waterproofing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-123946 Summary of the Invention [Problem to be solved by the invention]

[0005] The union joint disclosed in Patent Document 1 has the problem that if it is difficult to adjust the distance between the objects to be connected, it requires a considerable amount of effort to connect the objects to the connected objects.

[0006] The present invention has been made to solve these problems, and its object is to provide a coupling that reduces the effort required to connect objects when it is difficult to adjust the distance between the objects to be connected. [Means for solving the problem]

[0007] The joint of the present invention will be described with reference to the drawings. The use of the reference numerals in the drawings in this section is for the purpose of aiding in the understanding of the invention. The use of the reference numerals in the drawings in this section is not intended to limit the scope of the invention to that shown in the drawings.

[0008] To achieve the above-mentioned object, according to one aspect of the present invention, a coupling 10 includes a tubular portion 20 that forms a flow path, and a tubular connecting portion 22. The tubular connecting portion 22 connects the tubular portion 20 to an object 220 that is different from the tubular portion 20. This connection allows the flow path of the tubular portion 20 to communicate with a space different from the flow path. The tubular portion 20 has a first tubular body 30, a second tubular body 32, and a transition portion 34. The first tubular body 30 is tubular. One end of the first tubular body 30 can enter the second tubular body 32. The second tubular body 32 is tubular. The transition portion 34 changes the amount of entry of the one end of the first tubular body 30 into the second tubular body 32 in a direction along the axis 110 of the second tubular body 32 when the one end of the first tubular body 30 enters the second tubular body 32. The cylinder connecting portion 22 is engaged with the other end of the one cylinder body 30 so as to be movable in a direction along the axis 80 of the one cylinder body 30 and rotatable along the outer periphery of the one cylinder body 30 .

[0009] The change portion 34 changes the amount of penetration of one end of the one cylindrical body 30 into the other cylindrical body 32 in the direction along the axis 110 of the other cylindrical body 32 when the one end of the one cylindrical body 30 penetrates into the other cylindrical body 32. This reduces the effort required to connect the objects 200, 220 to be connected, even if it is difficult to adjust the distance between the objects 200, 220 to be connected.

[0010] It is also desirable that the transition section 34 described above has a body member 50 and a connector 52. The end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters can enter the body member 50. The connector 52 connects the body member 50 to a location of the one cylindrical body 30 different from the end that enters the other cylindrical body 32. A female thread is formed on the inner periphery of one end of the body member 50. A male thread is formed on the outer periphery of the end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters. The male thread can mesh with the female thread formed on the inner periphery of one end of the body member 50.

[0011] A female thread is formed on the inner periphery of one end of the body member 50. A male thread is formed on the outer periphery of the end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters. The male thread can mesh with the female thread formed on the inner periphery of one end of the body member 50. The end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters can enter the body member 50. A connector 52 connects the body member 50 to a location of the one cylindrical body 30 that is different from the end that enters the other cylindrical body 32. As the female thread formed on the inner periphery of one end of the body member 50 engages with the male thread formed on the outer periphery of the end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters, it becomes possible to change the amount of entry of one end of the one cylindrical body 30 into the other cylindrical body 32. The above-mentioned amount of penetration can be changed by the engagement of a female thread formed on the inner circumference of one end of the body member 50 with a male thread formed on the outer circumference of the end of the other cylindrical body 32 into which one end of the one cylindrical body 30 penetrates, making it easy to fine-tune the change in the amount of penetration.

[0012] Alternatively, it is desirable that a groove be formed on the inner periphery of the above-described body member 50 at a location different from the inner periphery at one end, the groove being arranged to surround the axis 148 of the body member 50. In this case, it is desirable that a groove be formed on the outer periphery of one of the cylindrical bodies 30 at a location connected to the body member 50, the groove extending to fit along the groove arranged to surround the axis 148 of the body member 50. In this case, it is desirable that the shape of the connector 52 be the shape described below. The shape is annular so that it can fit into the groove arranged to surround the axis 148 of the body member 50 and the groove extending to fit along the groove arranged to surround the axis 148 of the body member 50.

[0013] If the connector 52 can fit into a groove arranged to surround the axis 148 of the body member 50 and a groove extending along the groove arranged to surround the axis 148 of the body member 50, the configuration for connection by the connector 52 can be simplified in both the body member 50 and the one-side cylindrical body 30.

[0014] Alternatively, it is desirable that the transition portion 34 further includes a lock nut 54. The lock nut 54 can be engaged with a male thread formed on the outer periphery of the end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters.

[0015] The transition portion 34 further includes a lock nut 54. The lock nut 54 is capable of engaging with a male thread formed on the outer periphery of the end of the other cylindrical body 32 into which one end of the one cylindrical body 30 enters. In other words, the lock nut 54 is capable of engaging with a male thread that is common to the female thread formed on the inner periphery of one end of the body member 50. This allows the lock nut 54 to function as an anti-rotation device for the body member 50. Because the lock nut 54 functions as an anti-rotation device for the body member 50, the lock nut 54 can reduce the risk of the body member 50 rotating accidentally. [Effects of the Invention]

[0016] According to the present invention, even if it is difficult to adjust the distance between the objects to be connected, the effort required to connect the objects to be connected is reduced. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram of a joint according to an embodiment of the present invention; [Figure 2] 10A and 10B are views of a one-way barrel according to an embodiment of the present invention; [Figure 3] FIG. 10 is a view of the other cylinder according to an embodiment of the present invention. [Figure 4] 1 is a view of a tube connection according to an embodiment of the present invention. [Figure 5] 1 is a diagram of a body member according to an embodiment of the present invention. [Figure 6] 1 is a diagram of a fitting during connection according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a joint according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are the same. Therefore, detailed descriptions thereof will not be repeated.

[0019] [Structure description] Fig. 1 is a diagram of a joint 10 according to this embodiment. A portion of the joint 10 is cut away in Fig. 1. The configuration of the joint 10 of this embodiment will be described based on Fig. 1.

[0020] The joint 10 according to this embodiment is connected to a known gas pipe 200 and a known gas meter connection port 220.

[0021] As shown in FIG. 1, the joint 10 includes a cylindrical portion 20, a cylindrical connection portion 22, an inter-cylinder sealant 24, and a fire-resistant sealant 26.

[0022] The cylindrical portion 20 defines a flow path through which a fluid flows, an example of which is natural gas.

[0023] In this embodiment, the tubular portion 20 has one tubular body 30, another tubular body 32, and a transitional portion .

[0024] The first cylindrical body 30 is cylindrical. The second cylindrical body 32 is also cylindrical. One end of the first cylindrical body 30 can enter the second cylindrical body 32.

[0025] The change portion 34 changes the amount of penetration of one end of the one cylindrical body 30 into the other cylindrical body 32 when the one end of the one cylindrical body 30 penetrates into the other cylindrical body 32 .

[0026] The transition section 34 according to this embodiment includes a body member 50, a connector 52, and a lock nut 54.

[0027] The end of the other cylindrical body 32 that one end of the one cylindrical body 30 can enter into the body member 50 .

[0028] The connector 52 connects the body member 50 to a location of the first cylindrical body 30 that is different from the end that enters the second cylindrical body 32. The connector 52 in this embodiment is a metal member. The shape of the connector 52 is annular with one notch cut out. The specific location of the first cylindrical body 30 that is connected to the body member 50 by the connector 52 will be described later.

[0029] The lock nut 54 is capable of engaging with a male thread formed on the other cylindrical body 32. The specific location where the male thread is formed will be described later.

[0030] The tube connecting portion 22 connects the one-side tube body 30 to the gas meter connection port 220. The specific configuration of the tube connecting portion 22 will be described later.

[0031] The inter-cylinder seal 24 has an annular shape. The cross section of the inter-cylinder seal 24 is circular. The inter-cylinder seal 24 is made of rubber. When one end of the one cylinder 30 enters the inside of the other cylinder 32, the inter-cylinder seal 24 seals between the outer peripheral surface of the one cylinder 30 and the inner peripheral surface of the other cylinder 32.

[0032] The fire-resistant sealant 26 seals between the outer peripheral surface of the one cylindrical body 30 and the inner peripheral surface of the other cylindrical body 32 when the joint 10 according to this embodiment is heated by a fire or the like.

[0033] Fig. 2 is a diagram of one cylinder body 30 according to this embodiment. A part of one cylinder body 30 is cut away in Fig. 2. The configuration of one cylinder body 30 according to this embodiment will be described with reference to Figs. 1 and 2.

[0034] The one-side cylinder body 30 in this embodiment has an entry end portion 70, a one-side cylinder side connecting groove forming portion 72, a barrel position setting step forming portion 74, an engaging protruding ring forming portion 76, and a one-side space forming portion 78.

[0035] The entry end 70 is disposed at one end of the first cylindrical body 30. The entry end 70 enters the interior of the second cylindrical body 32.

[0036] The one-side tube-side connecting groove forming portion 72 forms a groove. This groove is used for connecting with the transitional portion 34. The groove will be described later.

[0037] The cylinder position setting step forming portion 74 forms a step. This step positions the transition portion 34. This step will be described later.

[0038] The engagement protrusion ring forming portion 76 forms an annular projection, with which the tube connecting portion 22 is engaged.

[0039] The one-way space forming portion 78 forms a space through which the fluid passes. This space penetrates the one-way cylindrical body 30. This space is the internal space of the one-way cylindrical body 30. This space becomes part of the flow path of the cylindrical portion 20.

[0040] Fig. 3 is a diagram of the other cylinder body 32 according to this embodiment. A part of the other cylinder body 32 is cut away in Fig. 3. The configuration of the other cylinder body 32 according to this embodiment will be described with reference to Figs. 1 and 3.

[0041] The other cylinder body 32 according to this embodiment has a tapered thread portion 100, a male thread portion 102, an inter-cylinder seal groove forming portion 104, a fire-resistant seal groove forming portion 106, and an other space forming portion 108.

[0042] The tapered thread portion 100 is disposed at one end of the other cylindrical body 32. A tapered male thread is formed on the tapered thread portion 100. The tapered male thread is to be mated with the tapered female thread formed on the gas pipe 200 described above.

[0043] The male threaded portion 102 is disposed on the outer periphery of the other end of the second cylindrical body 32, i.e., the end into which one end of the first cylindrical body 30 enters. A male thread is formed on the male threaded portion 102. This male thread engages with a female thread formed by the lock nut 54 described above and a female threaded portion 142 described below.

[0044] The inter-cylinder seal groove forming portion 104 is disposed on the inner periphery of the other end of the other cylinder 32. The inter-cylinder seal groove forming portion 104 forms a groove. The inter-cylinder seal material 24 is housed in the groove. Furthermore, the inter-cylinder seal groove forming portion 104 forms a space through which a fluid passes.

[0045] The fireproof seal groove forming portion 106 is disposed on the inner periphery of the other end of the other cylinder 32, behind the inter-cylinder seal groove forming portion 104 when viewed from the other end. The fireproof seal groove forming portion 106 forms a groove. The fireproof seal material 26 is accommodated in the groove. Furthermore, the fireproof seal groove forming portion 106 forms a space through which a fluid passes.

[0046] The other space forming portion 108 is disposed in a section of the inner circumference of the other cylinder body 32 from one end to the fire-resistant seal groove forming portion 106. The other space forming portion 108 forms a space through which a fluid passes.

[0047] The space formed by the inter-cylinder seal groove forming portion 104, the space formed by the fire-resistant seal groove forming portion 106, and the space formed by the other-side space forming portion 108 are all connected to each other. This allows fluid to pass through the inside of the other-side cylinder 32. The space formed by these and through which fluid can pass is the internal space of the other-side cylinder 32. This space becomes part of the flow path of the cylinder portion 20.

[0048] Fig. 4 is a diagram of the tube connecting portion 22 according to this embodiment. A part of the tube connecting portion 22 is cut away in Fig. 4. The configuration of the other tube body 32 according to this embodiment will be described with reference to Figs. 1 and 4.

[0049] The tube connecting portion 22 according to this embodiment has a flanged tube-shaped main body portion 120, an inner circumferential annular wall portion 122, and a female thread portion .

[0050] The flanged cylindrical main body 120 is cylindrical. A flange is formed at the end of the flanged cylindrical main body 120. The flanged cylindrical main body 120 forms a space in which the other end of the one cylinder 30 is disposed.

[0051] The inner annular wall portion 122 is disposed at one end of the inner circumference of the flanged cylindrical main body portion 120. The inner annular wall portion 122 is annular. The inner annular wall portion 122 protrudes from the inner circumference of the flanged cylindrical main body portion 120 toward the space formed thereby. The inner annular wall portion 122 engages with the engaging protruding ring-forming portion 76 of the one cylindrical body 30.

[0052] The female thread portion 124 is disposed at the other end of the inner circumference of the flanged cylindrical main body 120. The female thread portion 124 forms a female thread that mates with the male thread provided on the gas meter connection port 220 described above.

[0053] Fig. 5 is a diagram of a body member 50 according to this embodiment. In Fig. 5, a part of the tube connecting portion 22 is cut away. The configuration of the body member 50 according to this embodiment will be described based on Figs. 1 and 5.

[0054] The body member 50 according to this embodiment has a hexagonal columnar main body portion 140, a female thread portion 142, and a connecting groove forming portion 144.

[0055] The outer periphery of the hexagonal columnar main body 140 is shaped like a hexagonal column. The hexagonal columnar main body 140 forms a space therein for accommodating the other end of the other cylindrical body 32. As a result, the hexagonal columnar main body 140 can be said to be cylindrical.

[0056] The female threaded portion 142 is disposed at one end of the inner circumference of the hexagonal columnar main body 140. This female threaded portion 142 forms a female thread. This female thread can mesh with a male thread formed by the male threaded portion 102 of the other cylindrical body 32. When this female thread meshes with the male thread and rotates, the trunk member 50 according to this embodiment can move in a direction along the axis 110 of the other cylindrical body 32.

[0057] The connecting groove forming portion 144 is disposed at the other end of the inner circumference of the hexagonal columnar main body 140. The connecting groove forming portion 144 is annular. The connecting groove forming portion 144 protrudes from the inner circumference of the hexagonal columnar main body 140 toward the space formed thereby. A groove is formed at the protruding end of the connecting groove forming portion 144. The groove is disposed so as to surround the axis 148 of the body member 50. The connector 52 fits into the groove. Note that, to enable the connector 52 fitted into the groove to fit further, the groove formed by the one-cylinder-side connecting groove forming portion 72 of the one cylinder 30 extends so as to be able to follow the groove formed at the protruding end of the connecting groove forming portion 144.

[0058] [Assembly instructions] Next, a method for assembling the joint 10 according to this embodiment will be described. First, the worker passes the tube connecting portion 22 through the one cylinder body 30. This causes the inner peripheral annular wall portion 122 of the tube connecting portion 22 to engage with the engagement protrusion ring forming portion 76 of the one cylinder body 30. The tube connecting portion 22 also engages with the other end of the one cylinder body 30 so as to allow movement along the axis 80 of the one cylinder body 30 and rotation along the outer periphery of the one cylinder body 30. Next, the worker fits the connector 52 into the groove formed by the one-cylinder-side connecting groove forming portion 72 of the one cylinder body 30. After the connector 52 is fitted, the worker passes the body member 50 through the entry end 70 of the one cylinder body 30. As the connector 52 penetrates, it fits into the groove formed by the connecting groove forming portion 144 of the body member 50. By fitting the connector 52 into this groove, the body member 50 is connected to the one cylinder 30 so as to be able to rotate freely around the axis 80 of the one cylinder 30. Furthermore, the one cylinder 30 is connected to the body member 50 by the connector 52 at the one cylinder side connecting groove forming portion 72. Next, the worker engages the lock nut 54 with the male threads formed by the male thread portion 102 of the other cylinder 32 so that the other cylinder 32 fully passes through the lock nut 54. Next, the worker inserts the entry end 70 of the one cylinder 30 into the other space forming portion 108 of the other cylinder 32. Thereafter, the worker engages the female threads formed by the female thread portion 142 of the body member 50 with the male threads formed by the male thread portion 102 of the other cylinder 32. This completes the assembly of the joint 10 according to this embodiment.

[0059] [Connection instructions] Next, a method for connecting the gas pipe 200 and the gas meter connection port 220 to the joint 10 according to this embodiment will be described.

[0060] First, the worker connects the gas pipe 200 and the other cylindrical body 32. A tapered female thread is formed on the end of the inner circumference of the gas pipe 200. The tapered female thread engages with the male thread of the tapered thread portion 100 of the other cylindrical body 32, thereby connecting the gas pipe 200 and the other cylindrical body 32.

[0061] Next, the operator rotates the body member 50 of the transition portion 34 counterclockwise. As the body member 50 rotates with the female threads formed by the female thread portion 142 of the body member 50 meshing with the male threads formed by the male thread portion 102 of the other cylindrical body 32, the body member 50 according to this embodiment moves in a direction along the axis 110 of the other cylindrical body 32. As described above, the body member 50 is connected to the one cylindrical body 30 so as to be able to freely rotate about the axis 80 of the one cylindrical body 30. As a result, as the body member 50 rotates, the amount of penetration of one end of the one cylindrical body 30 into the other cylindrical body 32 in the direction along the axis 110 of the other cylindrical body 32 changes. The transition portion 34 changes this amount of penetration. In this case, as the body member 50 rotates counterclockwise, the one cylindrical body 30 moves in a direction away from the other cylindrical body 32. Accordingly, the other end of the one cylindrical body 30 approaches the gas meter connection port 220. The body member 50 moves away from the lock nut 54 .

[0062] When the other end of the first cylindrical body 30 is sufficiently close to the gas meter connection port 220, the worker brings the other end of the first cylindrical body 30 into contact with the portion of the gas meter connection port 220 that is connected to the other end of the first cylindrical body 30. FIG. 6 is a diagram of the fitting 10 during the connection operation according to this embodiment. A well-known gasket 240 is disposed between the other end of the first cylindrical body 30 and the portion of the gas meter connection port 220 that is connected to the other end of the first cylindrical body 30. In this embodiment, a male thread 222 is formed on the outer circumferential surface of the portion of the gas meter connection port 220 that is connected to the other end of the first cylindrical body 30. The worker engages the male thread 222 with the female thread formed by the female thread portion 124 of the tube connection portion 22. As this engagement occurs, the tube connection portion 22 moves in a direction away from the body member 50 compared to the state shown in FIG. 6. When this engagement is complete, the flow path of the tube portion 20 communicates with a space different from that flow path.

[0063] Next, the worker rotates the lock nut 54 of the transition section 34 counterclockwise. As the lock nut 54 rotates, it moves closer to the body member 50. The worker rotates the lock nut 54 until it comes into close contact with the body member 50. Once the lock nut 54 comes into close contact with the body member 50, the connection of the fitting 10 according to this embodiment to the gas pipe 200 and gas meter connection port 220 described above is then complete.

[0064] [Effects of the flexible pipe joint according to this embodiment] As is clear from the above description, the transition portion 34 according to this embodiment changes the amount of penetration of one end of the one cylindrical body 30 into the other cylindrical body 32 in the direction along the axis 110 of the other cylindrical body 32 when the one end of the one cylindrical body 30 penetrates into the other cylindrical body 32. This reduces the effort required to connect the gas pipe 200 and the gas meter connection port 220, even if it is difficult to adjust the distance between them.

[0065] In addition, a female thread is formed on the inner periphery of one end of the body member 50. A male thread is formed on the outer periphery of the end of the other cylinder 32, into which one end of the one cylinder 30 enters. This male thread can mesh with the female thread formed on the inner periphery of one end of the body member 50. The end of the other cylinder 32, into which one end of the one cylinder 30 enters, can enter the body member 50. A connector 52 connects the one cylinder 30 and the body member 50. This makes it possible to change the amount of entry of one end of the one cylinder 30 into the other cylinder 32. Furthermore, it is easy to fine-tune the change in the amount of entry.

[0066] Furthermore, if the connector 52 can fit into a groove arranged to surround the axis 148 of the body member 50 and a groove extending along the groove arranged to surround the axis 148 of the body member 50, the structure for connection by the connector 52 can be simplified in both the body member 50 and the one cylindrical body 30. In addition, the one cylindrical body 30 is prevented from rotating in conjunction with the rotation of the body member 50.

[0067] Furthermore, the lock nut 54 can engage with a male thread formed on the outer periphery of the end of the other cylinder 32 into which one end of the one cylinder 30 enters. In this case, the anti-rotation function of the lock nut 54 reduces the risk of accidental rotation of the body member 50.

[0068] In addition, the tube connecting portion 22 according to this embodiment connects the one cylindrical body 30 to the gas meter connection port 220. The tube connecting portion 22 is engaged with the other end of the one cylindrical body 30 so as to be movable in a direction along the axis 80 of the one cylindrical body 30 and rotatable along the outer periphery of the one cylindrical body 30. This reduces the effort required to connect the gas pipe 200 and the gas meter connection port 220 even when the gas meter connection port 220 is fixed. As a result, the effort required to connect the gas pipe 200 and the gas meter connection port 220 is reduced when the gas meter connection port 220 is fixed.

[0069] <Description of Modifications> The embodiments disclosed herein are illustrative in all respects, and the scope of the present invention is not limited to the above-described embodiments, and various design changes may be made without departing from the spirit of the present invention.

[0070] For example, the configuration of the transition portion 34 is not limited to that described above. Therefore, the transition portion 34 does not have to have a lock nut 54. Furthermore, instead of the lock nut 54, the transition portion 34 may be configured to stop the rotation of the body member 50 using other well-known configurations, such as a pin and a hole into which the pin fits. [Explanation of symbols]

[0071] 10...Joint 20...Cylinder part 22...Cylinder connection part 24...Cylinder seal material 26...Fireproof sealant 30...One cylinder body 32...Other cylindrical body 34...Change section 50...Body member 52...Connection body 54...Lock nut 70…Entry end 72...One cylinder side connection groove forming part 74...Body position setting step forming section 76...Protruding ring forming part for engagement 78...One side space forming part 80,110,148…axis line 100...Tapered thread 102...Male thread 104...Inter-cylinder seal groove forming portion 106...Fire-resistant seal groove forming portion 108...Other space forming part 120...Cylindrical main body with flange 122...inner annular wall 124, 142... Female thread 140...Hexagonal columnar body part 144...Connection groove forming part 200...Gas pipe 220...Gas meter connection port

Claims

1. a cylindrical portion that forms a flow path; a tube connecting portion that connects the tube portion to an object other than the tube portion so that the flow path of the tube portion communicates with a space other than the flow path, The cylindrical portion is a cylindrical one-sided cylinder; One end of the one cylindrical body is insertable into another cylindrical body; a change portion that changes the amount of penetration of one end of the one cylindrical body into the other cylindrical body in a direction along the axis of the other cylindrical body when the one end of the one cylindrical body penetrates into the other cylindrical body, A joint characterized in that the tube connecting portion is engaged with the other end of one of the tubes so as to be movable in a direction along the axis of the one of the tubes and rotatable along the outer periphery of the one of the tubes.

2. The change portion is a body member into which an end of the other cylindrical body into which one end of the one cylindrical body can enter; a connector that connects the one cylindrical body to the body member at a location different from the one end that enters the other cylindrical body, A female thread is formed on the inner periphery of one end of the body member, 2. A joint as described in claim 1, characterized in that the outer periphery of the other cylindrical body at the end into which the one end of the one cylindrical body enters is formed with a male thread that can engage with the female thread formed on the inner periphery of one end of the body member.

3. a groove is formed in an inner periphery of the body member at a location different from the inner periphery of the one end so as to surround the axis of the body member; a groove is formed on the outer periphery of the one cylindrical body at a location connected to the body member, the groove extending along the groove arranged to surround the axis of the body member; 3. The joint according to claim 2, wherein the shape of the connecting body is annular and can be fitted into a groove arranged to surround the axis of the body member and a groove extending along the groove arranged to surround the axis of the body member.

4. the transition portion further comprises a lock nut; 3. A joint according to claim 2, wherein the lock nut is engageable with the male thread formed on the outer periphery of the end of the other cylindrical body into which the one end of the one cylindrical body enters.

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