Piping Fittings

Abstract

To provide a joint for a pipeline which can omit work of attaching a socket to a nipple by swaging.SOLUTION: Coupling wall parts 1806 are provided on a coupling outer peripheral surface 1804 formed at a base part 12 side end of a nipple 18. Portions, which exclude the coupling wall parts 1806, in a circumferential direction of the coupling outer peripheral surface 1804 passing through the coupling wall parts 1806 are formed as coupling recessed parts 1808. Portions, which exclude annular wall parts 2004, in a circumferential direction of an inner peripheral surface of an end of a socket 20 passing through the annular wall parts 2004 provided at the end of the socket 20 are formed as insertion / removal missing parts 2006. A joint for a pipeline is provided with engagement pieces 2204 each of which is inserted into a space between the insertion / removal missing part 2006 and the coupling recessed part 1808 to prevent rotation of the socket 20 relative to the nipple 18 in a state that each coupling wall part 1806 enters from the insertion / removal missing part 2006 into the socket 20 and is located on a back surface 2004B of the annular wall part 2004.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a pipe joint having a nipple and a socket. [Background technology]

[0002] A piping joint having a nipple and a socket is connected to an end of a hose, and serves to supply the fluid flowing through the hose to an appropriate device or to discharge the fluid from the device. Conventionally, when connecting a piping joint having a nipple and a socket to the end of a hose in a factory, the nipple is first inserted into the socket and then a special crimping machine is used to crimp the end of the socket into the annular recess in the end of the nipple to attach it. Next, the end of the hose is inserted into the annular space between the outer peripheral surface of the nipple and the inner peripheral surface of the socket, and the socket is crimped using a crimping machine to integrate the end of the hose with the socket and nipple. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-278975 A Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, with conventional piping joints, it was necessary to use a special crimping machine to attach the socket to the nipple, which meant that the piping joints could not be manufactured easily and was disadvantageous in terms of improving the efficiency of the work of connecting the piping joint to the hose. Furthermore, if the socket is attached to the nipple in advance, inventory management is required, which is disadvantageous in terms of reducing costs. The present invention has been devised in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a piping fitting which can be easily manufactured by eliminating the need for the work of crimping a socket to a nipple to attach it, thereby eliminating the need to maintain a stock of piping fittings with sockets already attached to nipples, and which further allows the inner and outer diameters of the socket to be reduced, thereby being advantageous in terms of improving the efficiency and reducing the costs of the work of connecting the piping fitting to a hose. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, one embodiment of the present invention is a piping joint comprising a mouthpiece portion and a hose coupling portion, the hose coupling portion comprising a nipple having a hose insertion portion, and a socket surrounding the periphery of the hose insertion portion, the end of the nipple on the mouthpiece portion side is formed as a coupling outer circumferential surface having the same axis as the hose insertion portion, and a coupling wall portion is provided at the end of the coupling outer circumferential surface on the hose insertion portion side, the coupling wall portion being spaced from the end of the coupling outer circumferential surface on the mouthpiece portion side and projecting radially outwardly from the outer circumferential surface, and a portion of the coupling outer circumferential surface passing through the coupling wall portion, excluding the coupling wall portion, is a coupling recess. the end of the socket located on the nozzle portion side is provided with an annular wall portion which extends along the inner peripheral surface of the end of the socket with an inner diameter into which the outer peripheral surface for connection is inserted and has a back surface facing in the direction of the tip of the hose insertion portion, and the portion of the inner peripheral surface of the end of the socket that passes through the annular wall portion in the circumferential direction thereof excluding the annular wall portion forms an insertion / removal notch, and with the connection wall portion entering the inside of the socket from the insertion / removal notch and positioned on the back surface of the annular wall portion, a locking piece is provided which is inserted across the insertion / removal notch and the connection recess to prevent rotation of the socket relative to the nipple. In addition, one embodiment of the present invention is characterized in that the connecting wall portions and the connecting recesses are provided in a plurality of positions spaced apart in the circumferential direction of the connecting outer peripheral surface, the annular wall portions and the insertion / removal recesses are provided in a plurality of positions spaced apart in the circumferential direction of the inner peripheral surface of the end portion of the socket, and the locking pieces are provided in a plurality of positions so as to be inserted across the plurality of insertion / removal recesses and the plurality of connecting recesses. In addition, one embodiment of the present invention is characterized in that the multiple locking pieces are integrally formed on an annular body that can move in the axial direction of the socket through the annular space formed by the outer peripheral surface of the nipple and the inner peripheral surface of the socket. In one embodiment of the present invention, the connecting wall portion has a front surface facing the base portion, and a locking portion is provided on the front surface and the rear surface of the annular wall portion to lock them together. In addition, one embodiment of the present invention is characterized in that the width of the connecting wall portion along the circumferential direction of the connecting outer peripheral surface and the width of the annular wall portion along the circumferential direction of the inner peripheral surface of the end of the socket are approximately equal. In one embodiment of the present invention, the locking piece is attached to the joining recess. Effect of the Invention

[0006] According to one embodiment of the present invention, there is no longer a need to use a dedicated crimping machine to crimp the end of the socket into the annular recess at the end of the nipple, as was previously required, and the piping fitting can be easily manufactured, which is advantageous in improving the efficiency of the work of connecting the piping fitting to the hose. In addition, since the process of using a crimping machine to crimp the socket to the nipple to connect them can be omitted, inventory management that was required in the past when the socket was attached to the nipple in advance is also unnecessary, which is advantageous in reducing the cost of piping fittings. Furthermore, in one embodiment of the piping joint of the present invention, the socket has a uniform outer diameter when attached to the nipple, which is advantageous in reducing the diameter of the socket and is advantageous in reducing the weight and cost of the piping joint. Furthermore, providing a plurality of coupling walls, coupling recesses, annular walls, insertion / removal notches, and locking pieces is advantageous in preventing rotation of the socket relative to the nipple in a stable manner. Furthermore, providing a plurality of locking pieces integrally with the annular body is advantageous in that the piping joint can be easily manufactured, and is also advantageous in that the efficiency of the work of connecting the piping joint and the hose can be improved. Furthermore, by providing locking portions on the front surface of the connecting wall and the back surface of the annular wall, it is possible to easily align the connecting wall with respect to the annular wall, thereby improving the efficiency of the assembly work of the socket to the nipple. This is therefore advantageous in reducing the cost of the piping fitting and in improving the efficiency of the connection work between the piping fitting and the hose. Furthermore, by forming the width of the connecting wall portion along the circumferential direction of the connecting outer peripheral surface and the width of the annular wall portion along the circumferential direction of the inner peripheral surface of the end of the socket to be approximately equal, it is advantageous for easily aligning the multiple connecting wall portions with the multiple annular wall portions when the multiple connecting wall portions are inserted into the interior of the socket through the insertion / removal notches and the nipple and socket are rotated relative to one another, which is advantageous for easily manufacturing the piping fitting and for improving the efficiency of the work of connecting the piping fitting and the hose. Also, a locking piece may be attached to the joining recess so that the piping joint according to one embodiment of the present invention can be distributed on the market. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of a joint body according to the embodiment. [Diagram 2] FIG. 2 is a perspective view of a joint body according to the embodiment. [Diagram 3] FIG. 2 is a front view of a joint body according to the embodiment. [Figure 4] FIG. 2 is a perspective view of a socket according to an embodiment. [Diagram 5] FIG. 2 is a perspective view of a socket according to an embodiment. [Figure 6] FIG. 2 is a cross-sectional front view of a socket according to an embodiment. [Figure 7] FIG. 1A is a perspective view of a locking member according to an embodiment, and FIG. 1B is a perspective view of three locking pieces. [Figure 8] FIG. 2 is a perspective view of the state in which the nipple is inserted into the socket. [Figure 9] 13 is a perspective view of a state in which the coupling wall portion is inserted into the inside of the socket through the insertion / removal notch. FIG. [Figure 10]13 is a perspective view showing how the insertion / detachment notch and the coupling recess are aligned and the locking member is inserted into the socket. FIG. [Figure 11] are not cross-sectional views, but are hatched to clarify the relative positions of the nipple, socket, and locking member. (A) is a view from the end of the socket showing the state where the coupling wall portion is aligned with the insertion / removal notch, (B) is a view from the end of the socket showing the state where the insertion / removal notch and the coupling recess are aligned after the socket has been rotated, and (C) is a view from the end of the socket showing the state where the locking member has been inserted into the socket. [Figure 12] 11A is a cross-sectional view taken along X1-X1 in FIG. 11A, (B) is a cross-sectional view taken along X2-X2 in FIG. 11B, and (C) is a cross-sectional view taken along X3-X3 in FIG. 11C. [Figure 13] 13(A) to 13(D) are perspective views of modified examples of the joint body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 10, the piping joint 10 comprises a nozzle portion 12 and a hose joint portion 14, and a fluid passage 16 is formed penetrating the inside of the nozzle portion 12 and the hose joint portion 14, as shown in FIG. 12(A). As shown in FIG. 12(A), the base portion 12 includes a hexagonal portion 1202, an annular recess 1204 connected to the hexagonal portion 1202, a large diameter portion 1206 connected to the annular recess 1204, and a nut 1208 rotatably connected to the annular recess 1204. It should be noted that the nozzle portion 12 is not limited to the structure of this embodiment, and various conventionally known structures can be applied, such as a structure that is simply constituted by a male thread, a structure that is constituted by a cylindrical body that is brazed to the mating fluid passage, or a structure that is constituted by a hose coupling portion 14.

[0009] As shown in FIGS. 1, 10 and 12, the hose coupling portion 14 includes a nipple 18, a socket 20 and a locking member 22. As shown in FIG. 12(A), the nipple 18 is provided coaxially with the base portion 12 . As shown in FIGS. 1 to 3, the nipple 18 includes a hose insertion portion 1802, a coupling outer circumferential surface 1804, a coupling wall portion 1806, and a coupling recess 1808. As shown in FIG. Hose insertion portion 1802 is the portion that is inserted into the inside of the hose, and has projections and recesses 1810 on its surface for coupling with the hose. The outer circumferential surface for connection 1804 has the same axis as the hose insertion portion 1802 , and is provided at the end of the nipple 18 on the side of the mouthpiece 12 with an outer diameter larger than the outer diameter of the hose insertion portion 1802 . The coupling wall portion 1806 is provided at an end portion of the coupling outer peripheral surface 1804 on the hose insertion portion 1802 side and at a location spaced from the end portion of the coupling outer peripheral surface 1804 on the mouthpiece portion 12 side. The coupling walls 1806 are provided in a plurality at equally spaced locations in the circumferential direction of the coupling outer circumferential surface 1804 so as to protrude radially outward from the coupling outer circumferential surface 1804 . In this embodiment, a plurality of these are provided at locations on the outer circumferential surface 1804 for coupling spaced apart from the end face of the hexagonal portion 1202 and spaced at equal intervals in the circumferential direction of the outer circumferential surface. The multiple coupling walls 1806 are formed in the same shape. The dimension between the hexagonal portion 1202 and the connecting wall portion 1806 on the connecting outer surface 1804 is formed to allow the annular wall portion 2004 described later to rotate in the axial direction of the socket 20 without rattling, thereby shortening the nipple 18.

[0010] Further, in the circumferential direction of the coupling outer peripheral surface 1804 passing through the coupling wall portion 1806, the portion excluding the coupling wall portion 1806 forms a coupling recess 1808. In other words, the portions of the coupling wall portions 1806 adjacent to each other in the circumferential direction of the coupling outer peripheral surface 1804 form coupling recesses 1808. Each of the coupling walls 1806 has a front surface 1806A facing the base 12 side, and a locking recess 24A recessed in a direction away from the base 12 is provided as the locking portion 24 on the front surface 1806A. In this embodiment, the large diameter portion 1206, the annular recess 1204, the hexagonal portion 1202, the outer circumferential surface 1804 for connection, the wall portion 1806 for connection, the recess 1808 for connection, and the hose insertion portion 1802 form the joint body 26.

[0011] As shown in FIGS. 4 to 6, socket 20 has a socket body 2002 with a uniform outer diameter, and an annular wall portion 2004 and a notch 2006 for insertion and removal provided at the end of socket body 2002 located on the base portion 12 side. The socket body 2002 has an inner peripheral surface provided with a projection 2008 for coupling with a hose. The annular wall portion 2004 extends annularly along the inner circumferential surface of the end portion of the socket 20 at an inner diameter into which the outer circumferential coupling surface 1804 is inserted. The annular wall portion 2004 has a front surface 2004 A facing toward the ferrule portion 12 and a back surface 2004 B facing toward the tip of the hose insertion portion 1802 . The rear surface 2004B is provided with a locking protrusion 24B as the locking portion 24, which can be locked in the locking recess 24A. Further, the portion of the inner circumferential surface of the end of the socket 20 passing through the annular wall portion 2004 in the circumferential direction, excluding the annular wall portion 2004 , forms a cutout portion 2006 for insertion / removal. In this embodiment, the width of the connecting wall portion 1806 along the circumferential direction of the connecting outer peripheral surface 1804 and the width of the annular wall portion 2004 along the circumferential direction of the inner peripheral surface of the end of the socket 20 are formed to be approximately the same dimension. In addition, the width of the coupling recess 1808 along the circumferential direction of the coupling outer peripheral surface 1804 and the width of the insertion / removal recess 2006 along the circumferential direction of the inner peripheral surface of the end of the socket 20 are also formed to be approximately the same dimension. The width of the coupling wall portion 1806 along the circumferential direction of the coupling outer peripheral surface 1804, the width of the annular wall portion 2004 along the circumferential direction of the inner peripheral surface of the end portion of the socket 20, the width of the coupling recess 1808 along the circumferential direction of the coupling outer peripheral surface 1804, and the width of the insertion / removal recess 2006 along the circumferential direction of the inner peripheral surface of the end portion of the socket 20 are all formed to be approximately the same dimensions.

[0012] As shown in FIG. 7(A), the locking member 22 includes an annular body 2202 that is movable in the axial direction of the socket 20 in the annular space formed by the outer peripheral surface of the nipple 18 and the inner peripheral surface of the socket 20, and a plurality of locking pieces 2204 that are integrally formed with the annular body 2202 and protrude from equally spaced locations around the circumference of the annular body 2202. When the coupling wall portion 1806 enters the inside of the socket 20 through the insertion / removal recess 2006 and is positioned at the back surface 2004B of the annular wall portion 2004, the locking piece 2204 is inserted from the inside of the socket 20 across the insertion / removal recess 2006 and the coupling recess 1808, thereby preventing rotation of the socket 20 relative to the nipple 18.

[0013] Next, a method of using the piping joint 10 will be described. First, as shown in Figs. 1 to 3, the joint body 26 on which the nut 1208 is rotatably provided, and the socket 20 shown in Figs. 4 to 6 are prepared. Next, the worker inserts the nipple 18 into the socket 20 so that the nipple 18 is inside the socket 20, as shown in Figure 8, and then inserts the multiple connecting wall portions 1806 into the interior of the socket 20 through the insertion / removal recesses 2006, as shown in Figures 9, 11(A), and 12(A). Then, the operator rotates the nipple 18 and the socket 20 relative to each other, and when the front faces 1806A of the ends of the extending directions of the multiple connecting wall portions 1806 are positioned on the rear faces 2004B of the annular wall portions 2004, the operator rotates the nipple 18 and the socket 20 relative to each other while moving them apart in their axial directions. When the nipple 18 and the socket 20 are rotated relative to each other while moving them apart in their axial direction, as shown in Figures 11(B) and 12(B), the locking protrusion 24B engages with the locking recess 24A with the locking protrusion 24B positioned on the locking recess 24A, so that the operator can see that the nipple 18 and the socket 20 have been positioned circumferentially on the inner surface of the socket 20. In this state, the entire front surfaces 1806A of the multiple coupling walls 1806 are positioned over the entire rear surfaces 2004B of the multiple annular walls 2004, respectively, and the coupling recesses 1808 and the insertion / removal cutouts 2006 match.

[0014] Next, as shown in Figures 10, 11(C), and 12(C), the worker inserts the locking member 22, starting with the multiple locking pieces 2204 at the front, into the annular space between the outer peripheral surface of the hose insertion portion 1802 and the inner peripheral surface of the socket 20, and inserts the multiple locking pieces 2204 into the insertion / removal recess 2006 and the coupling recess 1808, respectively. As a result, the joint body 26 and the socket 20 are prevented from rotating relative to each other in the circumferential direction. In other words, the multiple coupling walls 1806 are located on the rear surface 2004B of the annular wall 2004, and the coupling recesses 1808 and the insertion / removal cutouts 2006 are kept aligned. After the multiple locking pieces 2204 have been inserted into the insertion / removal notch 2006 and the coupling recess 1808, respectively, a hose is inserted into the annular space between the outer peripheral surface of the hose insertion portion 1802 and the inner peripheral surface of the socket 20, and the socket 20 is crimped with a crimping machine to integrally couple the hose, socket 20, and nipple 18.

[0015] Therefore, according to the piping joint 10 of this embodiment, there is no longer any need to use a dedicated crimping machine to crimp the end of the socket 20 into the annular recess at the end of the nipple 18, as was done in the conventional case. The piping joint 10 is constructed by inserting the nipple 18 inside the socket 20 and rotating it relatively, and inserting the locking piece 2204 into the insertion / removal recess 2006 and the coupling recess 1808, respectively, so that the piping joint 10 can be easily manufactured, which is advantageous in improving the efficiency of the work of connecting the piping joint 10 to a hose. In addition, since the process of crimping the end of the socket 20 into the annular recess at the end of the nipple 18 to connect the socket 20 to the nipple 18 can be omitted, inventory management which was required in the conventional method of attaching the socket 20 to the nipple 18 in advance is also unnecessary, which is advantageous in reducing the cost of the piping fitting 10. Furthermore, in conventional piping joints in which the end of the socket 20 is crimped into the annular recess at the end of the nipple 18 to connect the socket 20 to the nipple 18, the inner diameter of the socket 20 on the annular recess side gradually becomes smaller as it approaches the annular recess because the end of the socket 20 is crimped into the annular recess at the end of the nipple 18. Therefore, in many cases, the inner and outer diameters of the socket 20 are made larger to allow the end of the hose to fit up to a specified point inside the socket 20. In contrast, in the piping joint 10 of the present embodiment, there is no need to crimp the end of the socket 20 into the annular recess at the end of the nipple 18 as in the conventional case, and the socket 20 has a uniform outer diameter when attached to the nipple 18, which is advantageous in reducing the diameter of the socket 20 and in reducing the weight and cost of the piping joint 10.

[0016] It is to be noted that the locking recess 24A provided on the front surface 1806A of the connecting wall portion 1806 and the locking protrusion 24B provided on the back surface 2004B of the annular wall portion 2004 may be omitted, but providing the locking portion 24 as in this embodiment makes it possible to easily align the connecting wall portion 1806 with the annular wall portion 2004 and improves the efficiency of the assembly work of the socket 20 to the nipple 18, which is advantageous in reducing the cost of the piping fitting 10 and in improving the efficiency of the connection work between the piping fitting 10 and the hose. Also, in this embodiment, the case where three each of the coupling wall portion 1806, coupling recess 1808, annular wall portion 2004, insertion / removal notch 2006, and locking piece 2204 are provided has been described, but it is also possible to provide one each of the coupling wall portion 1806, coupling recess 1808, annular wall portion 2004, insertion / removal notch 2006, and locking piece 2204. However, providing a plurality of the coupling wall portion 1806, coupling recess 1808, annular wall portion 2004, insertion / removal notch 2006, and locking piece 2204 as in the embodiment is advantageous in preventing rotation of the socket 20 relative to the nipple 18 in a stable manner. Figure 13(A) shows a case where two each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of the nipple 18, Figure 13(B) shows a case where four each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of the nipple 18, Figure 13(C) shows a case where five each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of the nipple 18, and Figure 13(D) shows a case where six each of coupling walls 1806 and coupling recesses 1808 are provided on the coupling outer peripheral surface 1804 of the nipple 18.

[0017] In addition, in this embodiment, as shown in FIG. 7(A), a locking member 22 is used in which a plurality of locking pieces 2204 are integrally formed with an annular body 2202. However, as shown in FIG. 7(B), the annular body 2202 may be omitted and the plurality of locking pieces 2204 may be inserted into the coupling recess 1808 from the insertion / removal recess 2006. However, when a locking member 22 having a plurality of locking pieces 2204 integrally formed with the annular body 2202 is used as in the embodiment, the plurality of locking pieces 2204 can be easily inserted from the insertion / detachment notch 2006 into the coupling recess 1808, which is advantageous in easily manufacturing the piping joint 10 and in improving the efficiency of the work of connecting the piping joint 10 to the hose. In addition, in this embodiment, the width of the connecting wall portion 1806 along the circumferential direction of the connecting outer peripheral surface 1804 and the width of the annular wall portion 2004 along the circumferential direction of the inner peripheral surface of the end of the socket 20 are formed to be approximately equal. Therefore, when the multiple connecting wall portions 1806 are inserted into the inside of the socket 20 from the insertion / removal notches 2006 and the nipple 18 and the socket 20 are rotated relatively to align the multiple connecting wall portions 1806 with the multiple annular wall portions 2004, this is advantageous in easily aligning the multiple connecting wall portions 1806 with the multiple annular wall portions 2004, which is advantageous in easily manufacturing the piping joint 10, and which is advantageous in improving the efficiency of the work of connecting the piping joint 10 to the hose.

[0018] Furthermore, the piping fitting 10 may be distributed on the market in a separate form without assembling the fitting body 26, socket 20, and locking member 22 or locking piece 2204, but it may also be distributed on the market with the fitting body 26, socket 20, and locking member 22 assembled. In this case, in order to prevent the locking member 22 or the locking piece 2204 from slipping out of the connecting recess 1808, the multiple connecting wall portions 1806 are inserted into the interior of the socket 20 through the insertion / removal notches 2006, the nipple 18 and the socket 20 are rotated relative to one another to position the multiple connecting wall portions 1806 on the back surface 2004B of the annular wall portion 2004, and when the multiple locking pieces 2204 are inserted into the insertion / removal notches 2006 and the connecting recess 1808, the locking pieces 2204 are pressed into the connecting recess 1808 or the locking pieces 2204 are adhered to the connecting recess 1808 using an adhesive, and the product can be distributed on the market in a state in which the locking pieces 2204 are attached to the connecting recess 1808. [Explanation of symbols]

[0019] 10. Piping joints 12 Cap part 1202 Hexagonal part 1204 Circular recess 1206 Large diameter section 1208 Nut 14 Hose joint 16 Fluid passage 18 Nipples 1802 Hose insertion part 1804 Outer surface for coupling 1806 Joining wall 1806A Front 1808 Joint recess 1810 Uneven part 20 Sockets 2002 Socket body 2004 Annular wall 2004A front 2004B back 2006 Notch for insertion / removal 2008 protrusion 22 Locking member 2202 Circular body 2204 Locking piece 24 Locking part 24A Locking recess 24B Locking protrusion 26 Fitting body

Claims

1. A piping joint comprising a mouthpiece and a hose joint, the hose joint comprising a nipple having a hose insertion portion and a socket surrounding the periphery of the hose insertion portion, The end of the nipple on the side of the nozzle portion is formed as an outer circumferential surface for connection having the same axis as the hose insertion portion, and a connection wall portion is provided at the end of the outer circumferential surface for connection on the side of the hose insertion portion, the connection wall portion being spaced from the end of the outer circumferential surface for connection on the side of the nozzle portion and protruding radially outward from the outer circumferential surface for connection, A portion of the outer circumferential surface passing through the connecting wall portion in a circumferential direction thereof except for the connecting wall portion is a connecting recess portion, an annular wall portion is provided at an end of the socket located on the side of the mouth portion, the wall portion having an inner diameter into which the outer circumferential surface for coupling is inserted and extending along the inner circumferential surface of the end of the socket and having a back surface facing the tip direction of the hose insertion portion; a portion of an inner peripheral surface of an end portion of the socket that passes through the annular wall portion in a circumferential direction, except for the annular wall portion, that is a notch for insertion and removal; a locking piece is provided which is inserted across the insertion / removal notch and the coupling recess in a state where the coupling wall portion enters the inside of the socket through the insertion / removal notch and is positioned on the back surface of the annular wall portion, and which prevents the socket from rotating relative to the nipple; The coupling wall has a front surface facing the base portion, A locking portion is provided on the front surface and the rear surface of the annular wall portion to lock with each other. A piping joint characterized by:

2. The coupling wall portion and the coupling recess portion are provided at intervals in a circumferential direction of the coupling outer peripheral surface, the annular wall portion and the insertion / removal notch portion are provided at intervals in the circumferential direction of the inner circumferential surface of the end portion of the socket, The locking pieces are provided in a plurality of pieces so as to be inserted across the plurality of insertion / removal notches and the plurality of coupling recesses, 2. The piping joint according to claim 1.

3. the plurality of locking pieces are integrally provided on an annular body that is movable in an axial direction of the socket within an annular space formed by an outer circumferential surface of the nipple and an inner circumferential surface of the socket; 3. The piping joint according to claim 2.

4. a width of the coupling wall along the circumferential direction of the coupling outer peripheral surface and a width of the annular wall along the circumferential direction of the inner peripheral surface of the end of the socket are substantially equal; 4. The piping joint according to claim 1, wherein the piping joint is a pipe joint.

5. The locking piece is attached to the coupling recess.

5. A piping joint according to claim 1, wherein the piping joint is a pipe joint.

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