Pipe joint

Abstract

To provide a pipe joint which can sufficiently regulate the withdrawal of a pipe body.SOLUTION: A pipe joint comprises a joint main body, a cap member, and a pair of lock rings including a depth-side lock ring arranged at a depth side of the joint main body in an axial core direction, and a front-side lock ring arranged at a front-side of the joint main body in the axial core direction. The pair of lock rings comprise a claw for regulating the withdrawal of a pipe body by being locked to an external peripheral face of the pipe body which is inserted into the joint main body, and also comprise a claw abutment ring which is arranged between the pair of lock rings. The claw abutment ring comprises a ring bottom face which is located inside a diameter of the claw abutment ring, and extends in the axial core direction of the joint main body. The ring bottom face is arranged between the claw of the depth-side lock ring and the claw of the front-side lock ring.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a pipe joint, and more particularly to a pipe joint provided with a lock ring that prevents an inserted pipe from being pulled out. [Background technology]

[0002] As an example of this type of pipe joint, the technology described in Patent Document 1 listed below has been proposed. As shown in Fig. 6, this pipe joint 101 includes a joint body 103 having a stepped surface at its innermost part that abuts against the innermost end of a pipe, a cylindrical cap member 104 that is assembled by screwing into an opening of the joint body 103, and a lock ring 105 that is accommodated in a lock ring accommodating portion of the joint body 103. In this pipe joint 101, the pipes 2A, 2B are inserted with the joint body 103 and the cap member 104 assembled.

[0003] As shown in Fig. 7(a) and Fig. 7(b), the lock ring 105 includes an annular flange 150 along the axial direction, an annular claw holder 151 formed by bending an end of the flange 150 toward the center, and a plurality of claws 152 formed by bending the inner surface of the claw holder 151. Two lock rings 105 are arranged side by side on the rear and front sides of the joint body 103 with the flange 150 abutting the inner surface of the lock ring accommodating part and the claws 152 extending toward the rear as they approach the inner diameter side, and are held between the engaging surface of the lock ring accommodating part and the pressing surface of the cap member 104 (see Fig. 6). When a pulling force acts on the pipe bodies 2A and 2B inserted into the pipe joint 101, the claws 152 of the lock ring 105 bite into the outer surfaces of the pipe bodies 2A and 2B, restricting the pipe bodies 2A and 2B from being pulled out from the pipe joint 101. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-90503 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the flange of the lock ring located at the back is clamped and fixed between the flange of the lock ring at the front and the engagement surface of the lock ring accommodating part, so when a pulling force is applied to the tube body, not only the claws on the lock ring but also the claw holding part itself deforms, causing the claws to not bite into the tube body sufficiently, and resulting in insufficient regulation of the tube body being pulled out.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a pipe joint that can sufficiently prevent a pipe body from being pulled out. [Means for solving the problem]

[0007] The pipe joint of the present invention is a pipe joint for connecting pipe bodies, comprising: a cylindrical joint body provided with an opening through which the pipe body is inserted and into which the pipe body is inserted to its rear side; a cylindrical cap member assembled to the opening; and a lock ring formed in an annular shape centered in the axial direction of the joint body and having claws that engage with the outer peripheral surface of the pipe body inserted into the joint body to prevent the pipe from being pulled out, the claws being formed so as to be inclined toward the rear side as they become radially inward in the annular shape, and comprising a claw abutment surface disposed on the front side of the claws and abutting against the claws from the front side when the claws are deformed toward the front side, the claw abutment surface being formed so as to be inclined toward the rear side as they become radially inward.

[0008] In the pipe joint, the claw abutment surface may be configured to face radially outer portions of the claws, and the claws may extend radially inward beyond the claw abutment surface.

[0009] The pipe joint may further include a rear connection surface extending radially inward from an inner tip edge of the pawl contact surface. Effect of the Invention

[0010] As described above, according to the present invention, it is possible to provide a pipe joint that can sufficiently restrict the pulling-out of a pipe body. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a partially cutaway side view of a pipe joint according to this embodiment. [Diagram 2] FIG. 2 is an enlarged view of the area indicated by II in FIG. [Diagram 3] FIG. 3 is a view of the lock ring of the pipe joint alone, with FIG. 3(a) being a side view and FIG. 3(b) being a front view. [Figure 4] FIG. 4 is a perspective view, partly in section, of a claw abutment ring of the pipe joint. [Diagram 5] FIG. 5 is an enlarged view of the periphery of a radially outer end portion of a claw abutment ring in a partially cutaway side view of a pipe joint according to a modified example. [Figure 6] FIG. 6 is a partially cutaway side view of a conventional pipe joint. [Figure 7] FIG. 7 is a view of the lock ring of the pipe joint alone, with FIG. 7(a) being a side view and FIG. 7(b) being a front view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A pipe fitting according to one embodiment of the present invention will be described below with reference to Figures 1 to 3. The pipe fitting 1 according to this embodiment is suitable for connecting copper pipes for medical gas, copper pipes for refrigerant gas, etc., which are examples of pipe bodies. It is known that medical gases, refrigerants (including both gas and liquid), etc., are generally under high pressure, for example, compared to the water pressure of tap water.

[0013] As shown in Fig. 1, the pipe joint 1 is a pipe joint that connects pipe bodies 2A and 2B. The pipe joint 1 also includes a joint body 3, a cap member 4, a plurality of lock rings 5, and a claw abutment ring 6. In order to connect the pipe bodies 2A and 2B to be connected, the pipe joint 1 is configured as a pair of pipe joint parts 7A and 7B that are integrally formed and have a symmetrical structure at a central position along the axial direction (longitudinal direction) of the pipe bodies 2A and 2B. For this reason, in the following description, the description of the pipe joint part 7A on one side with respect to the central position also serves to describe the configuration of the other side.

[0014] Note that the pipe joint part 7A on one side and the pipe joint part 7B on the other side have a joint body 3 that is symmetrically configured and integrated, but in the following explanation, even if the joint body 3 is symmetrically configured and integrated, when the joint body 3 is referred to as the joint body 3 in the explanation of the pipe joint part 7A on one side, it refers to the joint body 3 in the area occupied by the pipe joint part 7A on one side. Note that the reference numerals given to each part of the pipe joint part 7A are also given to the same part of the pipe joint part 7B, and the reference numerals given to each part of the pipe joint part 7B are also given to the same part of the pipe joint part 7A.

[0015] The configuration of one pipe joint part 7A will be described below. As shown in Fig. 2, the pipe joint part 7A comprises a joint body 3, a cap member 4, a pair of lock rings 5, and a claw abutment ring 6. In the pipe joint part 7A, the pair of lock rings 5 ​​include a rear lock ring 5C arranged on the rear side of the joint body 3, and a front lock ring 5D arranged side by side with the rear lock ring 5C on the front side of the joint body 3. Furthermore, the pipe joint part 7A of this embodiment comprises a seal ring 8 (see Fig. 1).

[0016] The joint body 3 is a cylindrical portion provided with an opening 30 through which the pipe 2A is inserted, and the pipe 2A is inserted to the rear side through the opening 30. The joint body 3 of this embodiment is formed in a cylindrical shape having a body-side insertion space 31 inside. The joint body 3 also integrally includes a main body large diameter portion 32 which is the portion on the front side (right side in FIG. 1) where the insertion of the pipe 2A begins, and a main body small diameter portion 33 which is the portion on the rear side (left side in FIG. 1) where the insertion of the pipe 2A ends.

[0017] The joint body 3 is made of metal, resin, a composite pipe body of metal and resin, etc. The pipe joint 1 of this embodiment is made of metal.

[0018] The opening 30 is a portion into which the region located at the rear side of the cap member 4 is inserted. The opening 30 is defined by the inner surface of the large diameter portion 32 of the main body.

[0019] The body-side insertion space 31 is formed in communication with the rear side of the opening 30. The rear end of the body-side insertion space 31 has a reduced diameter. The body-side insertion space 31 also has a lock ring accommodating portion 310 at the end on the opening 30 side (the front end).

[0020] Lock ring accommodating portion 310 is formed with a diameter smaller than opening 30 and larger than the inner end of main body side insertion space 31. Furthermore, the diameter of lock ring accommodating portion 310 is set slightly larger than the outer diameter of lock ring 5, so that lock ring 5 can be accommodated in lock ring accommodating portion 310. The length of lock ring accommodating portion 310 in the axial direction of joint main body 3 is set so that a pair of lock rings 5 ​​can be accommodated therein.

[0021] The main body large diameter portion 32 is formed to have a larger diameter than the main body small diameter portion 33. The main body large diameter portion 32 in this embodiment is cylindrical with the same outer diameter at any portion in the axial direction (depth direction, left-right direction in FIG. 1) of the joint main body 3. A female thread is formed on a part of the inner surface of the main body large diameter portion 32. An annular main body side large diameter seal accommodating portion 320 that accommodates a seal ring 8 (for example, a large diameter seal ring 80) is formed on the inner surface on the front side of the main body large diameter portion 32. The main body large diameter portion 32 also has a main body side first abutment surface 321 that abuts against the cap member 4. The main body side first abutment surface 321 is the end face on the front side of the main body large diameter portion 32.

[0022] The main body small diameter portion 33 is formed to have a smaller diameter than the main body large diameter portion 32. In this embodiment, the main body small diameter portion 33 includes a first main body small diameter portion 34 located on the front side and adjacent to the main body large diameter portion 32, and a second main body small diameter portion 35 located on the back side and adjacent to the first main body small diameter portion 34.

[0023] The first main body small diameter portion 34 of this embodiment is a tapered cylinder whose outer diameter becomes smaller as it is located toward the back. The first main body small diameter portion 34 has a main body side second abutment surface 340 that abuts against the cap member 4. The first main body small diameter portion 34 also has a locking surface 341 that locks with the rear lock ring 5C from the rear side. The first main body small diameter portion 34 is further located radially outside the rear lock ring 5C and the front lock ring 5D, and has a main body side opposing surface 342 that faces the rear lock ring 5C and the front lock ring 5D. The first main body small diameter portion 34 of this embodiment is a cylinder whose outer diameter is the same at any portion in the axial direction of the joint main body 3.

[0024] In the first main body small diameter portion 34 of this embodiment, the locking surface 341 and the main body side opposing surface 342 define a lock ring accommodating portion 310. The main body side second abutment surface 340 is, for example, a surface perpendicular to the axial direction of the joint main body 3. The locking surface 341 is, for example, a surface perpendicular to the axial direction of the joint main body 3. A radially inner portion of the locking surface 341 is chamfered.

[0025] The body-side opposing surface 342 extends toward the front from the radially outer end edge of the locking surface 341. Moreover, the body-side opposing surface 342 extends toward the rear from the radially inner tip edge of the body-side second abutment surface 340. Furthermore, the body-side opposing surface 342 is, for example, a surface extending in the axial direction of the joint body 3.

[0026] The second small diameter body portion 35 has an annular stepped surface 350 that abuts against the innermost end surface 20A of the pipe 2A to be inserted. The second small diameter body portion 35 also has a stepped wall 351 formed to be reduced in diameter at a central position in the axial direction of the joint body 3. The second small diameter body portion 35 also has an extending surface 352 that extends from the stepped surface 350 to the front side.

[0027] The stepped surface 350 in this embodiment is a surface perpendicular to the axial direction of the joint body 3. In addition, the stepped surface 350 is a side surface of a stepped wall 351.

[0028] The extending surface 352 is a surface that is inclined with respect to the stepped surface 350. Moreover, the extending surface 352 extends from the radially inner edge of the locking surface 341 toward the rear side. The extending surface 352 in this embodiment extends in the axial direction of the joint main body 3. Moreover, the extending surface 352 is disposed so as to be located radially outward of the outer circumferential surface of the pipe body 2A.

[0029] The cap member 4 is a cylindrical member that is assembled into the opening 30 of the joint body 3. The cap member 4 of this embodiment is assembled into the opening 30 by screw fastening. The cap member 4 is made of, for example, metal. The cap member 4 is formed into a cylindrical shape with a cap side insertion space 40 inside. The cap side insertion space 40 communicates with the body side insertion space 31 when the cap member 4 is assembled to the joint body 3.

[0030] The cap member 4 of this embodiment has a contraction portion 41 which is the end portion on the front side, a cap large diameter portion 42 which is integrally formed on the rear side of the contraction portion 41, and a cap small diameter portion 43 which is integrally formed on the rear side of the cap large diameter portion 42. The cap member 4 is made of metal or resin, and the cap member 4 of this embodiment is made of metal.

[0031] The outer surface of the reduction portion 41 is formed into a cone shape by being reduced toward the front side. An auxiliary seal receiving portion 410 for receiving a seal ring 8 (e.g., auxiliary seal ring 81) is formed on the inner surface of the reduction portion 41. The auxiliary seal ring 81 contacts the outer peripheral surface of the pipe body 2A and assists in preventing condensation occurring on the outer peripheral surface of the pipe body 2A outside the pipe fitting 1 from penetrating into the pipe fitting 1, for example.

[0032] The cap large diameter portion 42 is a portion that is gripped with a tool. The cap member 4 is screwed to the joint body 3 by gripping the cap large diameter portion 42 with a tool and rotating it. The cap large diameter portion 42 has a cap side first abutment surface 421 that abuts against the body side first abutment surface 321 of the body large diameter portion 32.

[0033] The cap side first abutment surface 421 is a surface perpendicular to the axial direction of the joint body 3. In addition, the cap side first abutment surface 421 is an annular surface.

[0034] The cap small diameter portion 43 is formed to have a smaller diameter than the cap large diameter portion 42. In addition, the cap small diameter portion 43 is formed integrally with the cap large diameter portion 42 via a cap side first abutment surface 421.

[0035] Furthermore, the cap small diameter portion 43 has a small diameter portion inner end face 430 which is an end face on the inner side. The small diameter portion inner end face 430 is an annular surface. The small diameter portion inner end face 430 is set to have a longer length in the radial direction than the main body side second abutment surface 340. The small diameter portion inner end face 430 is a surface which is approximately perpendicular to the axial direction of the joint main body 3.

[0036] Specifically, small diameter portion rear end face 430 has a pressing surface 431 that presses front side lock ring 5D from the front side. In addition, small diameter portion rear end face 430 has a cap side second abutment surface 432 that abuts against main body side second abutment surface 340 of joint main body 3. In small diameter portion rear end face 430, an annular recess (reference number omitted) is formed between pressing surface 431 and cap side second abutment surface 432.

[0037] The pressing surface 431 is disposed at a distance from the locking surface 341 of the joint body 3 in the axial direction of the joint body 3. The pressing surface 431 of this embodiment is a surface parallel to the locking surface 341. The pressing surface 431 is, for example, a surface perpendicular to the axial direction of the joint body 3. The pressing surface 431 contacts the front lock ring 5D when a pulling force is applied to the tube 2A. The pressing surface 431 of this embodiment has a chamfered radially inner portion and a radially outer portion. In addition, the inner end edge 433 of the pressing surface 431 is disposed at the same position as the inner end edge 343 of the locking surface 341 in the radial direction.

[0038] The cap side second abutment surface 432 is processed to have a smooth surface, for example. The cap side second abutment surface 432 is disposed on the stepped surface 350 side and on the inner side with respect to the male thread of the main body large diameter portion 32 of the joint main body 3.

[0039] The cap small diameter portion 43 of the present embodiment has a guide surface 434 extending forward from an inner tip edge 433 of the pressing surface 431. The guide surface 434 extends, for example, in the axial direction of the joint body 3. In addition, the guide surface 434 is disposed so as to be located radially outward of the outer circumferential surface of the tubular body 2A.

[0040] In this embodiment, a cap side large diameter seal accommodating portion 420 that accommodates the large diameter seal ring 80 at its inner diameter side portion is formed in a front portion of the outer surface of the cap small diameter portion 43. A male thread that screws into the female thread of the main body large diameter portion 32 of the joint main body 3 is formed in a portion of the outer surface of the cap small diameter portion 43 that is deeper than the cap side large diameter seal accommodating portion 420.

[0041] An annular cap side small diameter seal receiving portion 435 for receiving a seal ring 8 (for example, a small diameter seal ring 82) is formed on the inner surface of the cap small diameter portion 43. The cap side small diameter seal receiving portion 435 is disposed in the axial direction of the joint body 3 at a distance.

[0042] In the pipe joint 1 of this embodiment, a pair of pipe joint parts 7A having the above-mentioned configuration are configured as an integral structure, symmetrically on the left and right. In the pipe joint 1, the pair of lock rings 5 ​​are accommodated in the joint body 3 in a line in the axial direction of the joint body 3, with the flange 50 located on the radially inner side of the inner surface of the joint body 3 and the claws 52 extending toward the inner diameter side. In the cap member 4, the small diameter seal ring 82 is attached to the cap side small diameter seal accommodating portion 435, and the large diameter seal ring 80 is attached to the cap side large diameter seal accommodating portion 420 at its inner diameter side portion. In this manner, with each member attached to the joint body 3 and the cap member 4, the cap small diameter portion 43 of the cap member 4 is inserted into the opening 30 of the joint body 3, and assembled by screwing the male thread and the female thread. As a result, the joint body 3 and the cap member 4 are integrated, and the body side insertion space 31 and the cap side insertion space 40 are communicated with each other to form an insertion space for the pipe 2A.

[0043] When assembling the cap member 4 to the opening 30 of the joint body 3 by screwing the male thread and the female thread, the cap large diameter portion 42 is gripped with a tool, and the cap member 4 is rotated to tighten the cap member 4 to the joint body 3. Then, the outer diameter side portion of the large diameter seal ring 80 is accommodated in the body side large diameter seal accommodating portion 320.

[0044] Furthermore, the large diameter seal ring 80 is sandwiched and compressed between the outer surface of the cap side large diameter seal receiving portion 420 and the inner surface of the body side large diameter seal receiving portion 320. This seals the gap between the inner surface of the body large diameter portion 32 and the outer surface of the cap small diameter portion 43 on the outer side in the axial direction with respect to the threaded portion of the male thread and the female thread.

[0045] The pair of lock rings 5 ​​are arranged side by side in the lock ring receiving portion 310 so as to be in contact with each other in the axial direction of the joint body 3. Since the pair of lock rings 5 ​​have the same configuration, the description of the configuration of one lock ring 5 also applies to the description of the other lock ring 5.

[0046] 2, the lock ring 5 has an annular flange 50 centered in the axial direction of the joint body 3, an annular claw holder 51 formed by bending an end of the flange 50 toward the center, and a plurality of claws 52 formed on the inner surface side of the claw holder 51 by bending in the axial direction of the joint body 3. In addition, the lock ring 5 has an annular space 53 surrounded by the flange 50, the claw holder 51, and the claws 52.

[0047] The thickness of the lock ring 5 of this embodiment is uniform throughout the entirety. The lock ring 5 of this embodiment is made of metal.

[0048] The flange 50 of this embodiment extends in the axial direction of the joint body 3. A flange outer surface 501 located on the radially outer side of the flange 50 is, for example, a flat surface extending in this axial direction. A flange inner surface 502 located on the radially inner side of the flange 50 is, for example, a flat surface extending in this axial direction. Both the flange outer surface 501 and the flange inner surface 502 are chamfered at their front portions.

[0049] The claw holder portion 51 of this embodiment extends in a direction perpendicular to the axial direction of the joint body 3. A claw holder rear side surface 510 located on the rear side of the claw holder portion 51 is, for example, a plane extending in a direction perpendicular to the axial direction. A claw holder front side surface 511 located on the front side of the claw holder portion 51 is, for example, a plane extending in a direction perpendicular to the axial direction. Both the claw holder rear side surface 510 and the claw holder front side surface 511 are chamfered at their radially inner portions.

[0050] In the lock ring 5 of this embodiment, the claws 52 are disposed at equal intervals in the circumferential direction on the inner peripheral surface of the claw holder 51. Each claw 52 is bent so as to be inclined toward the insertion direction (rearward side) of the tubular body 2A. The outer diameter line of the claws 52 is formed in an arc shape as shown in FIG. 3. The imaginary circle C connecting the tips 520 of the claws 52 has a diameter slightly smaller than the outer diameter of the tubular body 2A as shown in FIG. 3(b). That is, the tips 520 of the claws 52 are located radially inward of the extension surface 352 and the guide surface 434 (see FIG. 2).

[0051] An outer surface 521 located on the radially outer side of the claw 52 is, for example, a flat surface. An inner surface 522 located on the radially inner side of the claw 52 is, for example, a flat surface.

[0052] The pair of lock rings 5 ​​described above are housed in a space surrounded by the engagement surface 341 of the joint body 3, the pressing surface 431 of the cap member 4, and the inner surface of the joint body 3 (e.g., the body-side opposing surface 342), and are configured so that the claws 52 engage with the outer peripheral surface of the inserted tube body 2A to prevent the tube body 2A from being pulled out.

[0053] Moreover, when a pulling force acts on the tube 2A, the front lock ring 5D comes into contact with the pressing surface 431 of the cap member 4, thereby restricting movement of the pair of lock rings 5 ​​toward the front side.

[0054] The pawl abutment ring 6 is housed in the annular space 53 of the lock ring 5. The pawl abutment ring 6 is housed in the annular space 53 in a state in which radial displacement of the pawl abutment ring 6 is permitted. The pawl abutment ring 6 of the present embodiment is made of metal.

[0055] Furthermore, the claw abutment ring 6 has a claw abutment surface 60 that is disposed in front of the claws 52 of the rear lock ring 5C and abuts against the claws 52 from the front side when the claws 52 of the rear lock ring 5C are deformed toward the front side. The claw abutment ring 6 of this embodiment has a claw holding abutment surface 61 that is radially outside the claw abutment surface 60 and located in front of the claw holding portion 51 of the rear lock ring 5C. The claw abutment ring 6 also has a deformation support surface 62 that abuts against the claw holding portion 51 of the front lock ring 5D from the rear side.

[0056] The claw abutment ring 6 of this embodiment has a ring bottom surface 63 which is a surface located on the radially inner side of the claw abutment ring 6, and a ring top surface 64 which is a surface located on the radially outer side of the claw abutment ring 6. Furthermore, the claw abutment ring 6 has a connection surface 65 which connects the inner tip edge of the deformation support surface 62 and the front end edge of the ring bottom surface 63.

[0057] The claw abutment surface 60 is, for example, a surface that abuts against the claws 52 of the rear lock ring 5C except for the tip portions 520. The claw abutment surface 60 is a surface that is located radially inward and at the rear side of the claw abutment ring 6. The claw abutment surface 60 in this embodiment is disposed between the claws 52 of the rear lock ring 5C and the claws 52 of the front lock ring 5D. That is, from the rear side to the front side of the joint body 3, the claws 52 of the rear lock ring 5C, the claw abutment surface 60, and the claws 52 of the front lock ring 5D are disposed in this order.

[0058] The claw abutment surface 60 extends parallel to the claw holding abutment surface 61. The claw abutment surface 60 may be a flat surface or a curved surface, but is, for example, a flat surface. Furthermore, the claw abutment surface 60 is a surface perpendicular to the axial direction of the joint body 3.

[0059] The pawl abutment surface 60 of this embodiment is radially continuous with the pawl holding abutment surface 61. Moreover, the pawl abutment surface 60 of this embodiment is flush with the pawl holding abutment surface 61.

[0060] Furthermore, the claw abutment ring 6 of this embodiment is disposed so that the distance between the inner tip edge 600 of the claw abutment surface 60 and the axis α of the joint body 3 coincides with the distance between the inner tip edge 343 of the locking surface 341 of the joint body 3 and the axis α of the joint body 3. The distance between the inner tip edge 600 of the claw abutment surface 60 and the axis α of the joint body 3 also coincides with the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axis α of the joint body 3. Note that, as the inner tip edge of a chamfered portion such as the locking surface 341 or the pressing surface 431, the inner tip edge of this portion before being chamfered (assuming that the chamfering is not performed) is used.

[0061] In this pawl abutment ring 6, the pawls 52 of the rear lock ring 5C extend radially inward beyond the pawl abutment surface 60. The pawls 52 of the front lock ring 5D of this embodiment extend radially inward beyond the pawl abutment surface 60.

[0062] The claw holding abutment surface 61 is a surface that abuts against, for example, the claw holding portion 51 of the rear lock ring 5C. Specifically, the claw holding abutment surface 61 abuts against the claw holding front side surface 511 of the rear lock ring 5C. The claw holding abutment surface 61 is a surface that is located radially outward and at the rear side of the claw abutment ring 6. The claw holding abutment surface 61 extends radially outward from the radially outer edge of the claw abutment surface 60.

[0063] The claw retaining abutment surface 61 in this embodiment is disposed between the claw retaining portion 51 of the rear lock ring 5C and the claw retaining portion 51 of the front lock ring 5D. That is, from the rear side to the front side of the joint body 3, the claw retaining portion 51 of the rear lock ring 5C, the claw retaining abutment surface 61, and the claw retaining portion 51 of the front lock ring 5D are disposed in this order.

[0064] The claw holding abutment surface 61 may be a flat surface or a curved surface, but is, for example, a flat surface. The claw holding abutment surface 61 is a surface perpendicular to the axial direction of the joint body 3. A radially outer portion of the claw holding abutment surface 61 is chamfered.

[0065] The deformation support surface 62 abuts against the claw holding rear surface 510 of the front lock ring 5D. The deformation support surface 62 is a surface located radially outward and on the front side of the claw abutment ring 6. The deformation support surface 62 in this embodiment is disposed between the claw holding portion 51 of the rear lock ring 5C and the claw holding portion 51 of the front lock ring 5D. That is, from the rear side to the front side of the joint body 3, the claw holding portion 51 of the rear lock ring 5C, the deformation support surface 62, and the claw holding portion 51 of the front lock ring 5D are disposed in this order.

[0066] The deformation support surface 62 may be a flat surface or a curved surface, but is, for example, a flat surface. The deformation support surface 62 is a surface perpendicular to the axial direction of the joint body 3. The deformation support surface 62 is a surface parallel to the claw abutment surface 60 and the claw retaining abutment surface 61. The deformation support surface 62 is disposed at a distance from the claw retaining abutment surface 61 toward the rear side.

[0067] A chamfer is applied to a radially outer portion of the deformation support surface 62. In the axial direction of the joint body 3, the distance (dimension) between the deformation support surface 62 and the claw retaining abutment surface 61 may be such that the claw abutment ring 6 is sandwiched between the pair of lock rings 5 ​​in a state in which radial displacement of the claw abutment ring 6 is permitted, and for example, corresponds to the distance between the claw retaining rear side surface 510 of the front lock ring 5D and the claw retaining front side surface 511 of the rear lock ring 5C.

[0068] The ring bottom surface 63 extends forward from the inner tip edge of the claw abutment surface 60. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. In addition, the ring bottom surface 63 is located radially outward of the tip portions 520 of the claws 52 of the lock ring 5.

[0069] 4, the ring bottom surface 63 is, for example, an annular surface. The ring bottom surface 63 may be a flat surface or a curved surface, but is, for example, a flat surface. The ring bottom surface 63 is a surface extending in the axial direction of the joint body 3. The distance between the ring bottom surface 63 of the claw abutment ring 6 and the axial center α of the joint body 3 coincides with the distance between the extension surface 352 of the joint body 3 and the axial center α of the joint body 3 (see FIG. 2).

[0070] The ring top surface 64 extends between the outer edge of the claw holding contact surface 61 and the outer edge of the deformation support surface 62. The ring top surface 64 may be a flat surface or a curved surface, but is, for example, a flat surface. The ring top surface 64 extends parallel to the flange inner surface 502 of the front lock ring 5D. In this embodiment, the rear and front portions of the ring top surface 64 are chamfered.

[0071] The ring top surface 64 extends, for example, parallel to the flange inner surface 502 of the front lock ring 5D. Moreover, the ring top surface 64 is disposed in a state spaced apart radially inward from the flange inner surface 502 of the front lock ring 5D. In this embodiment, the radial distance between the ring top surface 64 and the flange inner surface 502 is equal at every portion in the axial direction of the joint body 3, except for the chamfered portion of the ring top surface 64.

[0072] The connection surface 65 is disposed on the front side of the claw abutment surface 60. The connection surface 65 may be a flat surface or a curved surface, but is, for example, a flat surface. The connection surface 65 is disposed between the radially outer portion and the claws 52 of the claw holder 51 of the rear lock ring 5C and the radially outer portion and the claws 52 of the claw holder 51 of the front lock ring 5D. The connection surface 65 is disposed radially inwardly and spaced apart from the claw inner surface 522 of the front lock ring 5D.

[0073] In the above pipe joint 1, since the claw abutment ring 6 is provided with the claw abutment surface 60, even if a pull-out force acts on the pipe body 2A and a force toward the front side is applied to the claw 52 of the rear lock ring 5C, causing the claw 52 to deform toward the front side, the claw 52 abuts against the claw abutment surface 60. At this time, the claw abutment ring 6 is allowed to move radially in the annular space 53. Specifically, the rear lock ring 5C and the front lock ring 5D are surrounded by the flange 50 in the radial direction, and the front lock ring 5D abuts against the pressing surface 431, restricting the movement toward the front side. Since the claw abutment ring 6 is allowed to move radially within the rear lock ring 5C and the front lock ring 5D, the claw abutment ring 6 is centered by abutment with the claw 52 of the rear lock ring 5C, and is disposed so that the axis of the claw abutment ring 6 coincides with the axis of the pipe body 2A. Therefore, each of the claws 52 provided on the rear lock ring 5C comes into contact with the claw contact surface 60 evenly.

[0074] Then, as the tube body 2A is further pulled out, the claws 52 of the rear lock ring 5C are aligned with the claw abutment surface 60 of the claw abutment ring 6, and the portions of the claws 52 located radially inward from the claw abutment surface 60 bite into the tube body 2A, thereby sufficiently regulating the pulling-out of the tube body 2A.

[0075] In the pipe fitting 1 of the above embodiment, the claw abutment surface 60 is a surface perpendicular to the axial direction of the fitting body, i.e., a surface that extends in a direction perpendicular to the direction in which the pipe body 2A is pulled out. Therefore, even if force is applied to the claw abutment surface 60 as the pipe body 2A progresses in being pulled out, the claw abutment surface 60 can efficiently support the claws 52 of the rear lock ring 5C.

[0076] Furthermore, in the pipe fitting 1 of the above embodiment, the claw retaining abutment surface 61 is located radially outward of the claw abutment surface 60 and in front of the claw retaining portion 51 of the rear locking ring 5C. Therefore, when a pulling-out force is generated in the pipe body 2A, the claw retaining abutment surface 61 abuts against the claw retaining portion 51 of the rear locking ring 5C from the front side, thereby reliably restricting deformation of the claw retaining portion 51.

[0077] Furthermore, in the pipe fitting 1 of the above embodiment, the deformed support surface 62 abuts against the claw retaining portion 51 of the front lock ring 5D from the rear side, so that even if a pulling force is generated in the pipe body 2A, causing the claw 52 of the rear lock ring 5C to deform and pressure to be applied to the claw abutment surface 60 and the claw retaining abutment surface 61, the deformed support surface 62 in the claw abutment ring 6 can support the claw abutment surface 60 and the claw retaining abutment surface 61 so that they do not shift toward the rear side.

[0078] In the pipe fitting 1 of the above embodiment, the claw abutment ring 6 is positioned so that the distance between the ring bottom surface 63 of the claw abutment ring 6 and the axial center α of the joint body 3 matches the distance between the inner tip edge 343 of the locking surface 341 of the joint body 3 and the axial center α of the joint body 3. Therefore, the ring bottom surface 63 of the claw abutment ring 6 is positioned the same distance from the axial center α of the joint body 3 as the inner tip edge 343 of the locking surface 341 of the joint body 3. This prevents the claw abutment ring 6 from interfering with the pipe 2A when the pipe 2A is inserted into the joint body 3, and when a pulling force is applied to the pipe 2A, the claws 52 of the rear lock ring 5C can abut against the claw abutment surface 60 to the widest extent possible, allowing the claws 52 to bite into the pipe 2A.

[0079] Although the present invention has been described with reference to one embodiment, the present invention is not limited to the embodiment.

[0080] Although the claw abutment ring 6 in the above embodiment has the claw abutment surface 60 as well as the claw abutment surface 61, the deformation support surface 62, etc., it is sufficient that the claw abutment ring 6 has at least the claw abutment surface 60. For example, it is conceivable that the claw abutment ring 6 does not have the claw abutment surface 61. It is also conceivable that the claw abutment ring 6 does not have the deformation support surface 62.

[0081] Although the claw abutment surface 60 in the above embodiment is a surface perpendicular to the axial direction of the joint body 3, it may be a surface inclined with respect to this axial direction. For example, the claw abutment surface 60 may extend along the extending direction of the claws 52 of the rear lock ring 5C. An example of a claw abutment ring 6 having such a configuration will be described in detail below with reference to FIG. 5.

[0082] The claw abutment ring 6 has a ring bottom surface 63 located radially inward of the claw abutment surface 60. The claw abutment ring 6 also has a ring top surface 64 located radially outward. The claw abutment ring 6 also has a front connecting surface 65 that connects the inner tip edge of the deformation support surface 62 and the front edge of the ring bottom surface 63. The claw abutment ring 6 has a rear connecting surface 66 that connects the inner tip edge of the claw abutment surface 60 and the rear edge of the ring bottom surface 63.

[0083] The claw abutment surface 60 is, for example, a surface that abuts against a portion of the claw 52 of the rear lock ring 5C excluding the tip portion 520. Specifically, the claw abutment surface 60 faces a radially outer portion of the claw 52 of the rear lock ring 5C (for example, a portion that is equal to or less than half of the radially outer side of the claw 52). In addition, the claw abutment surface 60 is separated from the radially outer portion of the claw 52 of the rear lock ring 5C.

[0084] Moreover, the claw abutment surface 60 is a surface located radially inward and at the rear side of the claw abutment ring 6. The claw abutment surface 60 in this embodiment is disposed between the claws 52 of the rear lock ring 5C and the claws 52 of the front lock ring 5D. That is, from the rear side to the front side of the joint body 3, the claws 52 of the rear lock ring 5C, the claw abutment surface 60, and the claws 52 of the front lock ring 5D are disposed in this order.

[0085] In addition, the claw abutment surface 60 extends along the direction in which the claws 52 of the rear lock ring 5C extend. For example, the claw abutment surface 60 extends in a different direction from the claw retaining abutment surface 61. In this embodiment, the claw abutment surface 60 is continuous with the claw retaining abutment surface 61 in the radial direction.

[0086] The claw abutment surface 60 has an extended tip portion 601. The extended tip portion 601 is disposed at a predetermined distance radially outwardly spaced from the radially inner tip edge of the claw outer surface 521, which is the front side surface of the claw 52 of the rear lock ring 5C. The claw abutment surface 60 may be a flat surface or a curved surface, but is, for example, a flat surface.

[0087] Furthermore, the claw abutment ring 6 of this embodiment is disposed so that the distance between the inner tip edge 600 of the claw abutment surface 60 and the axis α of the joint body 3 is greater than the distance between the inner tip edge 343 of the locking surface 341 of the joint body 3 and the axis α of the joint body 3. The distance between the inner tip edge 600 of the claw abutment surface 60 and the axis α of the joint body 3 is greater than the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axis α of the joint body 3. Note that, as the inner tip edge of a chamfered portion such as the locking surface 341 or the pressing surface 431, the inner tip edge of this portion before being chamfered (assuming that the chamfering is not performed) is used.

[0088] In this pawl abutment ring 6, the pawls 52 of the rear lock ring 5C extend radially inward beyond the pawl abutment surface 60. The pawls 52 of the front lock ring 5D of this embodiment extend radially inward beyond the pawl abutment surface 60.

[0089] The claw holding abutment surface 61 is a surface that abuts against, for example, the claw holding portion 51 of the rear lock ring 5C. Specifically, the claw holding abutment surface 61 abuts against the claw holding front side surface 511 of the rear lock ring 5C. The claw holding abutment surface 61 is a surface that is located radially outward and at the rear side of the claw abutment ring 6. The claw holding abutment surface 61 extends radially outward from the radially outer edge of the claw abutment surface 60.

[0090] The claw retaining abutment surface 61 in this embodiment is disposed between the claw retaining portion 51 of the rear lock ring 5C and the claw retaining portion 51 of the front lock ring 5D. That is, from the rear side to the front side of the joint body 3, the claw retaining portion 51 of the rear lock ring 5C, the claw retaining abutment surface 61, and the claw retaining portion 51 of the front lock ring 5D are disposed in this order.

[0091] The claw holding abutment surface 61 may be a flat surface or a curved surface, but is, for example, a flat surface. The claw holding abutment surface 61 is a surface perpendicular to the axial direction of the joint body 3. A radially outer portion of the claw holding abutment surface 61 is chamfered.

[0092] The deformation support surface 62 abuts against the claw holding rear surface 510 of the front lock ring 5D. The deformation support surface 62 is a surface located radially outward and on the front side of the claw abutment ring 6. The deformation support surface 62 in this embodiment is disposed between the claw holding portion 51 of the rear lock ring 5C and the claw holding portion 51 of the front lock ring 5D. That is, from the rear side to the front side of the joint body 3, the claw holding portion 51 of the rear lock ring 5C, the deformation support surface 62, and the claw holding portion 51 of the front lock ring 5D are disposed in this order.

[0093] The deformation support surface 62 may be a flat surface or a curved surface, but is, for example, a flat surface. The deformation support surface 62 is a surface perpendicular to the axial direction of the joint body 3. The deformation support surface 62 is a surface parallel to the claw abutment surface 60 and the claw retaining abutment surface 61. The deformation support surface 62 is disposed at a distance from the claw retaining abutment surface 61 toward the rear side.

[0094] A chamfer is applied to a radially outer portion of the deformation support surface 62. In the axial direction of the joint body 3, the distance (dimension) between the deformation support surface 62 and the claw retaining abutment surface 61 may be such that the claw abutment ring 6 is sandwiched between the pair of lock rings 5 ​​in a state in which radial displacement of the claw abutment ring 6 is permitted, and for example, corresponds to the distance between the claw retaining rear side surface 510 of the front lock ring 5D and the claw retaining front side surface 511 of the rear lock ring 5C.

[0095] The ring bottom surface 63 extends forward from the inner tip edge of the claw abutment surface 60. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. In addition, the ring bottom surface 63 is located radially outward of the tip portions 520 of the claws 52 of the lock ring 5.

[0096] Moreover, the ring bottom surface 63 is, for example, an annular surface. The ring bottom surface 63 may be a flat surface or a curved surface, but is, for example, a flat surface. Furthermore, the ring bottom surface 63 is a surface extending in the axial direction of the joint body 3. Furthermore, the distance between the ring bottom surface 63 of the claw abutment ring 6 and the axial center α of the joint body 3 coincides with the distance between the extension surface 352 of the joint body 3 and the axial center α of the joint body 3.

[0097] The ring top surface 64 extends between the outer edge of the claw holding contact surface 61 and the outer edge of the deformation support surface 62. The ring top surface 64 may be a flat surface or a curved surface, but is, for example, a flat surface. The ring top surface 64 extends parallel to the flange inner surface 502 of the front lock ring 5D. In this embodiment, the rear and front portions of the ring top surface 64 are chamfered.

[0098] Furthermore, the ring top surface 64 extends, for example, parallel to the flange inner surface 502 of the front lock ring 5D. Moreover, the ring top surface 64 is disposed in a state spaced apart radially inward from the flange inner surface 502 of the front lock ring 5D. In this embodiment, the radial distance between the ring top surface 64 and the flange inner surface 502 is equal at every portion in the axial direction of the joint body 3, except for the chamfered portion of the ring top surface 64.

[0099] The front connection surface 65 is disposed closer to the front than the claw abutment surface 60. The front connection surface 65 may be a flat surface or a curved surface, but is, for example, a flat surface. The front connection surface 65 is disposed between the radially outer portion and the claws 52 of the claw holding portion 51 of the rear lock ring 5C and the radially outer portion and the claws 52 of the claw holding portion 51 of the front lock ring 5D. The front connection surface 65 is disposed radially inwardly spaced from the claw inner surface 522 of the front lock ring 5D.

[0100] The rear connection surface 66 is disposed on the rear side of the claw abutment surface 60. The rear connection surface 66 may be a flat surface or a curved surface, but is, for example, a flat surface. The rear connection surface 66 is a surface perpendicular to the axial direction of the joint body 3. Furthermore, the rear connection surface 66 extends radially inward from the inner tip edge 600 of the claw abutment surface 60.

[0101] The rear connection surface 66 is disposed between the claws 52 of the rear lock ring 5C and the claws 52 of the front lock ring 5D. The rear connection surface 66 is disposed in a state spaced apart toward the front side from the claw outer surface 521 of the front lock ring 5D. An inner tip edge 660 of the rear connection surface 66 in this embodiment is located radially outward of the inner tip edges of the claws 52 of the rear lock ring 5C and the front lock ring 5D.

[0102] Furthermore, the claw abutment ring 6 of this embodiment is disposed so that the distance between the inner tip edge 660 of the rear connection surface 66 and the axis α of the joint body 3 matches the distance between the inner tip edge 343 of the locking surface 341 of the joint body 3 and the axis α of the joint body 3. In addition, the distance between the inner tip edge 660 of the rear connection surface 66 and the axis α of the joint body 3 is greater than the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axis α of the joint body 3.

[0103] In the above pipe joint 1, the claw abutment ring 6 is provided with a claw abutment surface 60 that extends in the direction in which the claws 52 of the lock ring 5 extend, so that even if a pull-out force acts on the tubular body 2A and the claws 52 of the rear lock ring 5C are deformed toward the front, the claws 52 abut against the claw abutment surface 60. At this time, the claw abutment surface 60 restricts the deformation of the claws 52 of the rear lock ring 5C, so that a portion of the claws 52 located radially inward from the claw abutment surface 60 (for example, the tip portion 520) firmly bites into the tubular body 2A, sufficiently restricting the pull-out of the tubular body 2A.

[0104] In the pipe fitting 1 of the above embodiment, the extended tip portion of the claw abutment surface 60 is spaced radially outward a predetermined distance from the radially inner tip portion of the front side surface of the claw 52 of the rear locking ring 5C. Therefore, since the tip portion 520 of the claw 52 of the rear locking ring 5C is spaced apart from the claw abutment surface 60, when a pulling-out force is generated on the pipe body 2A, the tip portion 530 of the claw 52 of the rear locking ring 5C reliably deforms and bites into the pipe body 2A, thereby reliably restricting the pulling-out of the pipe body 2A.

[0105] Also, in the pipe fitting 1 of the above embodiment, because the ring bottom surface 63 is flat, even if the ring bottom surface 63 hits the pipe 2A, the pipe 2A will not be damaged by the ring bottom surface 63. Furthermore, because the ring bottom surface 63 is flat, the strength of the portion of the claw abutment ring 6 on the ring bottom surface 63 side is ensured, so that even if a pull-out force is generated in the pipe 2A and the claws 52 of the rear lock ring 5C are deformed, the ring bottom surface 63 can support the claw abutment surface 60 so that it does not shift to the rear side.

[0106] Although the ring bottom surface 63 of the claw abutment ring 6 in the above embodiment is a flat surface, it may be a curved surface. For example, the ring bottom surface 63 may be a curved surface having a convex shape facing radially inward.

[0107] Although the multiple claws 52 of the lock ring 5 in the above embodiment are arranged at equal intervals in the circumferential direction, they may be arranged at different intervals in the circumferential direction.

[0108] Although the cap member 4 in the above embodiment is assembled to the joint body 3 by screw fastening, it may be assembled by other methods such as fitting.

[0109] a cylindrical joint body provided with an opening through which the pipe body is inserted and into which the pipe body is inserted to its rear side; a cylindrical cap member assembled to the opening; an annular flange centered in the axial direction of the joint body; an annular claw holding portion formed by bending an end of the flange toward the center; and a plurality of claws formed on an inner surface side of the claw holding portion by bending in the axial direction, the flange being positioned radially inward relative to the inner surface of the joint body and the claws extending toward the rear as they approach the inner diameter side, the pair of lock rings being accommodated in the joint body side by side in the axial direction with the flange located radially inward relative to the inner surface of the joint body and the claws extending toward the rear as they reach the inner diameter side, the pair of lock rings including a rear-side lock ring arranged on the rear side of the joint body and a front-side lock ring arranged on the front side of the joint body, the cap member has a pressing surface that presses the front-side lock ring from the front side, the pair of lock rings are contained within a space surrounded by the locking surface of the joint body, the pressing surface of the cap member, and the inner surface of the joint body, and are configured so that the claws engage with the outer peripheral surface of the inserted tube body to regulate withdrawal of the tube body, and further includes a claw abutment ring contained within an annular space surrounded by the flange, claw holding portion, and claws of the front-side lock ring, the claw abutment ring is disposed on the front side of the claws of the rear lock ring and has claw abutment surfaces that abut against the claws from the front side when the claws of the rear lock ring are deformed toward the front side, the claws of the rear lock ring extend radially inward beyond the claw abutment surfaces, and the claw abutment ring is contained within the annular space in a state in which radial displacement is permitted.

[0110] According to this configuration, since the claw abutment surface is provided on the claw abutment ring, even if a pulling force acts on the tube and the claw of the rear lock ring is deformed toward the front, the claw abuts on the claw abutment surface. At this time, the claw abutment ring is allowed to move radially in the annular space, so that the axis of the claw abutment ring coincides with the axis of the inserted tube by being centered by the abutment with the claw of the rear lock ring. Therefore, each claw provided on the rear lock ring evenly abuts on the claw abutment surface. Then, when the tube is further pulled out, the claw of the rear lock ring is aligned with the claw abutment surface of the claw, and the part of the claw located radially inward from the claw abutment surface of the claw abutment ring bites into the tube, so that the pulling out of the tube is sufficiently restricted.

[0111] In the pipe joint, the claw abutment surface may be a surface perpendicular to the axial direction.

[0112] With this configuration, the claw abutment surface is a surface that extends in a direction perpendicular to the direction in which the tube is pulled out, so that even if force is applied to the claw abutment surface as the tube progresses in being pulled out, the claw abutment surface can efficiently support the claws of the rear lock ring.

[0113] In the pipe joint, the pawl abutment ring may be provided with a pawl retaining abutment surface located radially outward of the pawl abutment surface and in front of the pawl retaining portion of the rear lock ring.

[0114] According to this configuration, when a pulling force is applied to the tube body, the claw holding abutment surface abuts against the claw holding portion of the rear lock ring from the front side, thereby reliably restricting deformation of this claw holding portion.

[0115] In the pipe joint, the pawl abutment ring may be provided with a deformed support surface that abuts against the pawl holding portion of the front lock ring from a rear side.

[0116] With this configuration, even if a pulling force is generated in the tube body and the claws of the rear lock ring are deformed, the deformation support surface of the claw abutment ring can support the claw abutment surface and the claw retention abutment surface so that they do not shift toward the rear side.

[0117] In addition, in the pipe joint, the claw abutment surface may be arranged so that the distance between the inner tip edge of the claw abutment surface and the axis of the joint body matches the distance between the inner tip edge of the locking surface and the axis of the joint body.

[0118] With this configuration, the inner tip edge of the claw abutment ring is positioned away from the axis of the joint body by the same distance as the inner tip edge of the pressing surface of the cap member, thereby preventing the claw abutment ring from interfering with the tube when it is inserted into the joint body, and in the event that a pulling force is generated on the tube, the claws of the rear lock ring can abut against the claw abutment surface as widely as possible, allowing the claws to dig into the tube.

[0119] The pipe joint of the present invention is a pipe joint for connecting pipe bodies, and comprises: a cylindrical joint body provided with an opening through which the pipe body is inserted, and into which the pipe body is inserted to its rear side; a cylindrical cap member assembled to the opening; and a pair of lock rings including a rear lock ring disposed at the rear side in the axial direction of the joint body and a front lock ring disposed at the front side in the axial direction of the joint body, the pair of lock rings having claws that engage with the outer peripheral surface of the pipe body inserted into the joint body to restrict withdrawal of the pipe, and further comprising a claw abutment ring disposed between the pair of lock rings, the claw abutment ring being located radially inward of the claw abutment ring and having a ring bottom surface extending in the axial direction of the joint body, the ring bottom surface being disposed between the claws of the rear lock ring and the claws of the front lock ring.

[0120] Moreover, in the pipe joint, the joint body may have a locking surface that locks with the rear lock ring from the rear side, and the ring bottom surface may be positioned so that the distance between the ring bottom surface and the axis of the joint body matches the distance between an inner tip edge of the locking surface and the axis of the joint body.

[0121] In addition, in the pipe joint, the joint body may have a stepped surface against which the innermost end surface of the inserted pipe abuts, and an extending surface extending forward from the stepped surface, and the ring bottom surface may be positioned so that the distance between the ring bottom surface and an axis of the joint body matches the distance between the extending surface and the axis of the joint body. [Explanation of symbols]

[0122] 1...pipe joint, 2A, 2B...pipe body, 3...joint body, 4...cap member, 5...lock ring, 5C...rear lock ring, 5D...front lock ring, 6...claw abutment ring, 7A, 7B...pipe joint portion, 8...seal ring, 20A...innermost end surface, 30...opening, 31...main body side insertion space, 32...main body large diameter portion, 33...main body small diameter portion, 34...first main body small diameter portion, 35...second main body small diameter portion, 40...cap side insertion space, 41...reducing portion, 42...cap Large diameter portion, 43...small diameter portion of cap, 50...flange, 51...claw holding portion, 52...claw, 53...annular space, 60...claw abutment surface, 61...claw holding abutment surface, 62...deformation support surface, 63...ring bottom surface, 64...ring top surface, 65...connection surface (front connection surface), 66...rear connection surface, 80...large diameter seal ring, 81...auxiliary seal ring, 82...small diameter seal ring, 101...pipe joint, 103...joint body, 104...cap member, 105...lock ring, 150... flange, 151... claw holder, 152... claw, 310... lock ring accommodating portion, 320... main body side large diameter seal accommodating portion, 320... main body side large diameter seal accommodating portion, 321... main body side first abutting surface, 340... main body side second abutting surface, 341... locking surface, 342... main body side opposing surface, 343... inner tip edge, 350... stepped surface, 351... stepped wall, 352... extension surface, 410... auxiliary seal accommodating portion, 420... cap side large diameter seal accommodating portion, 421... cap side first abutment surface, 430... small diameter portion rear end surface, 431... pressing surface, 432... cap side second abutment surface, 433... inner tip edge, 434... guide surface, 435... cap side small diameter seal accommodating portion, 501... flange outer surface, 502... flange inner surface, 510... jaw holding rear side surface, 511... jaw holding front side surface, 520... tip portion, 521... jaw outer surface, 522... jaw inner surface, 600... inner tip edge, 601... extended tip portion, 660... inner tip edge, α... axis, C... imaginary circle

Claims

1. A pipe joint for connecting pipe bodies, a cylindrical joint body having an opening into which the pipe is inserted, the pipe being inserted into the inner side through the opening; A cylindrical cap member that is assembled to the opening; a lock ring having a ring shape centered in the axial direction of the joint body and having a claw that engages with an outer peripheral surface of the pipe inserted into the joint body to restrict pulling out of the pipe, The claws are formed to be inclined toward the inner side of the diameter of the annular shape, a claw contact surface that is disposed on a front side of the claw and contacts the claw from the front side when the claw is deformed toward the front side; The claw abutment surface is formed to be inclined toward the inner side toward the back side. Pipe fittings.

2. The claw abutment surface is configured to face a radially outer portion of the claw, The claws extend radially inward beyond the claw abutment surface.

2. The pipe fitting of claim 1.

3. a rear connection surface extending radially inward from an inner tip edge of the claw abutment surface, A pipe joint according to claim 1 or 2.

Images