CN113167415B

CN113167415B - Pipe joint

Info

Publication number: CN113167415B
Application number: CN202080005903.2A
Authority: CN
Inventors: 寺田孝
Original assignee: Tanyuan Co ltd
Current assignee: Tanyuan Co ltd
Priority date: 2019-11-19
Filing date: 2020-09-14
Publication date: 2024-07-09
Anticipated expiration: 2040-09-14

Abstract

The pipe joint of the present invention comprises: the connector includes a connector body, a cap member, a deep side locking ring disposed on a deep side of the connector body, a near side locking ring disposed on a near side of the connector body, and a claw abutment ring, wherein the locking ring is housed in a space surrounded by a locking surface of the connector body, a pressing surface of the cap member, and an inner surface of the connector body, and is configured to restrict removal of the pipe body by the claw being locked to an outer peripheral surface of the inserted pipe body, the claw abutment ring is disposed on a near side of the claw of the deep side locking ring, and has a claw abutment surface that abuts against the claw from the near side when the claw of the deep side locking ring deforms toward the near side, the claw of the deep side locking ring extends radially inward than the claw abutment surface, and the claw abutment ring is housed in the annular space in a state in which displacement movement in a radial direction is allowed.

Description

Pipe joint

Cross-reference to related applications

The present application claims priority from japanese patent application No. 2019-208806 and japanese patent application No. 2019-208811, and is incorporated by reference into the description of the present application.

Technical Field

The present invention relates to pipe fittings and, more particularly, to pipe fittings having locking rings for limiting pull-out of an inserted pipe body.

Background

As such a pipe joint, a technique is proposed in patent document 1 below. As shown in fig. 8, the pipe joint 101 includes: a joint body 103 having a stepped surface at an inner depth portion, the stepped surface being in contact with the deepest end of the pipe body; a tubular cap member 104 that is screwed to the opening of the joint body 103; the lock ring 105 is accommodated in a lock ring accommodating portion of the joint body 103. In this pipe joint 101, the pipe bodies 2A, 2B are inserted in a state where the joint body 103 and the cap member 104 are assembled.

As shown in fig. 9A and 9B, the lock ring 105 includes: an annular flange 150 in the axial direction; an annular claw holding portion 151 formed by bending from the end of the flange 150 toward the center; a plurality of claws 152 formed by bending toward the inner surface side of the claw holding portion 151. In a state where the flange 150 is in contact with the inner surface of the lock ring housing portion and extends to the deep side with the inner diameter side of the claw 152, two lock rings 105 are arranged side by side on the deep side and the near-front side of the joint body 103, and the two lock rings 105 are sandwiched between the engagement surface of the lock ring housing portion and the pressing surface of the cap member 104 (see fig. 8). When an extraction force acts on the pipe bodies 2A, 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, 2B, so that the pipe bodies 2A, 2B can be restricted from being extracted from the pipe joint 101.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2019-90503

Summary of the invention

Problems to be solved by the invention

However, the flange of the lock ring located on the deep side is sandwiched and fixed between the flange of the lock ring located on the near side and the engagement surface of the lock ring housing. Therefore, when a pulling-out force is applied to the pipe body, not only the claws in the lock ring but also the claw holding portions themselves are deformed. Thus, the claws do not bite into the pipe body sufficiently, and the restriction of the pipe body removal becomes insufficient.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a pipe joint capable of sufficiently suppressing the removal of a pipe.

Means for solving the problems

The pipe joint of the present invention is a pipe joint for connecting pipe bodies, comprising: a tubular joint body provided with an opening into which the pipe body is inserted, the pipe body being inserted to the deep side through the opening; a tubular cap member attached to the opening; a pair of lock rings including a deep side lock ring disposed on a deep side of the joint body and a near side lock ring disposed on a near side of the joint body, each lock ring having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; a plurality of claws formed by bending from the claw holding portion to a depth side in the axial direction, wherein the pair of locking rings are housed in the joint main body side by side in the axial direction in a state in which the flange is located radially inward of an inner surface of the joint main body and the claws extend to the inner diameter side to the depth side; the joint body has a locking surface that is locked with the deep-side locking ring from the deep side, the cap member has a pressing surface that presses the near-side locking ring from the near side, the pair of locking rings are accommodated in 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 the locking rings are configured to be locked with the outer peripheral surface of the inserted pipe body to restrict the removal of the pipe body, the locking rings are disposed on the near side of the deep-side locking ring, and have a claw abutment surface that abuts against the claw when the claw of the deep-side locking ring is deformed toward the near side, the claws of the deep-side locking ring are extended radially inward from the claw abutment surface, and the claw abutment ring is accommodated in the annular space in a state of allowing the claw abutment ring to move radially upward.

In the pipe joint, the claw contact surface may be a surface perpendicular to the axial direction.

In the pipe joint, the claw contact ring may have a claw holding contact surface located on a front side of the claw holding portion of the depth side lock ring on a radial outer side of the claw contact surface.

In the pipe joint, the claw contact ring may have a deformed support surface that contacts the claw holding portion of the near-front lock ring from the deep side.

In the pipe joint, the claw contact surface may be configured to: the distance between the inner front end edge of the claw abutting surface and the axis of the joint main body is consistent with the distance between the inner front end edge of the locking surface and the axis of the joint main body.

The pipe joint of the present invention is a pipe joint for connecting pipe bodies, comprising: a tubular joint body provided with an opening into which the pipe body is inserted, the pipe body being inserted to the deep side through the opening; a tubular cap member attached to the opening; a pair of lock rings including a deep side lock ring disposed on a deep side of the joint body and a near side lock ring disposed on a near side of the joint body, each lock ring having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; a plurality of claws formed by bending from the claw holding portion to a depth side in the axial direction, wherein the pair of locking rings are housed in the joint main body side by side in the axial direction in a state in which the flange is located radially inward of an inner surface of the joint main body and the claws extend to the inner diameter side to the depth side; and a claw contact ring which is accommodated in an annular space surrounded by the flange of the front side locking ring, the claw holding portion, and the claw, wherein the cap member has a pressing surface for pressing the front side locking ring from the front side, the pair of locking rings are configured to restrict the removal of the pipe body by the claw being engaged with the outer peripheral surface of the inserted pipe body, the claw contact ring is disposed at the front side of the claw of the depth side locking ring, and has a claw contact surface which contacts the claw from the front side when the claw of the depth side locking ring is deformed to the front side, the claw of the depth side locking ring extends radially inward than the claw contact surface, and the claw contact surface extends in a direction in which the claw of the depth side locking ring extends.

In the pipe joint, the extending tip portion of the claw contact surface is disposed so as to be separated from the radially inner tip portion of the side surface of the depth-side lock ring on the front side by a predetermined distance.

In the pipe joint, the claw contact ring has a flat or curved ring bottom surface on a radially inner side than the claw contact surface, and the ring bottom surface is located radially outward of the tip end portions of the claws of the depth side lock ring.

Drawings

Fig. 1 is a partially cut-away side view of a pipe joint of the present embodiment.

Fig. 2 is an enlarged view of the area indicated by II in fig. 1.

Fig. 3A is a side view of a single locking ring of the pipe joint.

Fig. 3B is a front view of a single locking ring of the pipe joint.

Fig. 4 is a partially cut-away perspective view of the jaw abutment ring of the pipe joint.

Fig. 5 is a partially cut-away side view of a pipe joint of a modification.

Fig. 6 is an enlarged view of the area denoted by VI of fig. 5.

Fig. 7 is a partially cut-away perspective view of the jaw abutment ring of the coupling.

Fig. 8 is a partially cut-away side view of a prior art pipe joint.

Fig. 9A is a side view of a single locking ring of the pipe joint.

Fig. 9B is a front view of a single locking ring of the pipe joint.

Detailed Description

A pipe joint according to an embodiment of the present invention will be described below with reference to fig. 1 to 3. The pipe joint 1 of the present embodiment is preferably used for connecting medical gas copper pipes, cooling medium gas copper pipes, and the like, which are examples of pipe bodies. In general, the pressure in the case where medical gas, cooling medium (including both gas and liquid), and the like are flowed through the tube is higher than the pressure in the case where tap water is flowed through the tube, for example.

As shown in fig. 1, the pipe joint 1 is a pipe joint for connecting pipe bodies 2A, 2B. The pipe joint 1 further includes a joint body 3, a cap member 4, a plurality of lock rings 5, and a claw contact ring 6. In order to connect the connected pipe bodies 2A, 2B to each other, the pipe joint 1 is configured such that the pipe joint portions 7A, 7B having a laterally symmetrical structure are formed integrally in a pair at a central position of the pipe bodies 2A, 2B in the axial direction (longitudinal direction). Therefore, in the following description, the description of the joint portion 7A located on one side with respect to the center position will be used as the description of the other side structure.

The joint body 3 has a laterally symmetrical structure and is integrally formed with the one joint portion 7A and the other joint portion 7B. In the following description, even in the case of the joint body 3 having a laterally symmetrical structure and being integrated, the joint body 3 in the description of the one-side joint portion 7A only represents the region occupied by the one-side joint portion 7A in the joint body 3. The reference numerals for each portion of the pipe joint portion 7A are also the same as those for the pipe joint portion 7B. The reference numerals for the respective parts of the pipe joint portion 7B are also the same as those for the pipe joint portion 7A.

The structure of the one pipe joint portion 7A will be described below. As also shown in fig. 2, the joint portion 7A has a joint main body 3, a cap member 4, a pair of lock rings 5, and a claw abutment ring 6. In the joint portion 7A, the pair of lock rings 5 includes a deep side lock ring 5C disposed on the deep side of the joint body 3, and a near side lock ring 5D disposed on the near side of the joint body 3 in parallel with the deep side lock ring 5C. The joint portion 7A of the present embodiment has a seal ring 8 (see fig. 1).

The joint body 3 is provided with an opening 30 into which the pipe body 2A is inserted, and the joint body 3 is a tubular portion into which the pipe body 2A is inserted to the deep side through the opening 30. The joint body 3 of the present embodiment is formed in a cylindrical shape having a body-side insertion space 31 therein. The joint body 3 integrally has a main body large diameter portion 32 and a main body small diameter portion 33, wherein the main body large diameter portion is a portion located on the front side (right side in fig. 1) when the insertion of the pipe body 2A is started, and the main body small diameter portion 33 is a portion located on the deep side (left side in fig. 1) after the insertion of the pipe body 2A is completed. Further, the near front side refers to the central side in the extending direction of the joint main body 3. The deep side is the end edge side in the extending direction of the joint main body 3. The front side is a side closer to the opening 30 of the joint body 3, and the deep side is a side farther from the opening 30 of the joint body 3.

The joint body 3 is made of metal or resin. The joint body 3 may be formed of a combination of a metal and a resin. That is, the joint body 3 may be a composite pipe body or the like. The pipe joint 1 of the present embodiment is made of metal.

The opening 30 is a portion into which the region of the cap member 4 located on the deep side is inserted. The opening 30 is defined by the inner surface of the main body large diameter portion 32.

The main body side insertion space 31 is formed to communicate with the deep side of the opening 30. The end portion of the main body side insertion space 31 on the deep side is reduced in diameter. The main body side insertion space 31 has a lock ring housing portion 310 at an end (near front end) on the opening 30 side.

The diameter of the lock ring housing portion 310 is smaller than the opening portion 30 and larger than the end portion on the deep side of the main body side insertion space 31. The diameter of the lock ring housing 310 is set to be slightly larger than the outer diameter of the lock ring 5, so that the lock ring 5 can be housed in the lock ring housing 310. The length of the lock ring housing portion 310 in the axial direction of the joint body 3 is set so as to be able to house a pair of lock rings 5.

The main body large diameter portion 32 is formed larger in diameter than the main body small diameter portion 33. The main body large diameter portion 32 of the present embodiment is a cylindrical shape having an outer diameter equal at any portion in the axial direction (depth direction, left-right direction in fig. 1) of the joint main body 3. An internal 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 ring accommodating portion 320 accommodating the seal ring 8 (e.g., the large-diameter seal ring 80) is formed on the inner surface of the main body large-diameter portion 32 on the front side. The main body large diameter portion 32 has a main body side first contact surface 321 that contacts the cap member 4. The main body side first contact surface 321 is an end surface of the main body large diameter portion 32 on the front side.

The diameter of the main body small diameter portion 33 is formed smaller than the main body large diameter portion 32. The main body small diameter portion 33 of the present embodiment includes: a first main body small diameter portion 34 located on the near front side and adjacent to the main body large diameter portion 32; and a second main body small diameter portion 35 located on the deep side and adjacent to the first main body small diameter portion 34.

The first main body small diameter portion 34 of the present embodiment is a tapered cylindrical shape in which the outer diameter becomes smaller as the portion is located further to the depth side. The first main body small diameter portion 34 has a main body side second contact surface 340 that contacts the cap member 4. The first body small diameter portion 34 has an engagement surface 341 for engaging with the deep side lock ring 5C from the deep side. The first main body small diameter portion 34 has a main body side facing surface 342 located radially outward of the deep side lock ring 5C and the near side lock ring 5D and facing the deep side lock ring 5C and the near side lock ring 5D. The first main body small diameter portion 34 of the present embodiment is a cylindrical shape having an equal outer diameter at any portion in the axial direction of the joint main body 3.

In the first body small diameter portion 34 of the present embodiment, the locking surface 341 and the body-side opposing surface 342 define the lock ring housing portion 310. The body-side second contact surface 340 is, for example, a surface perpendicular to the axial direction of the joint body 3. The engagement surface 341 is, for example, a surface perpendicular to the axial direction of the joint body 3. The radially inner portion of the locking surface 341 is chamfered.

The main body side facing surface 342 extends from the radially outer end edge of the engagement surface 341 to the near front side. The main body side facing surface 342 extends from the radially inner front end edge of the main body side second contact surface 340 to the deep side. The main body side facing surface 342 is a surface extending in the axial direction of the joint main body 3, for example.

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

The stepped surface 350 of the present embodiment is a surface perpendicular to the axial direction of the joint body 3. In addition, the step surface 350 is constituted by a side surface of the step wall 351.

The extension surface 352 is a surface inclined with respect to the step surface 350. The extension surface 352 extends from the radially inner end edge of the engagement surface 341 to the deep side. The extension surface 352 of the present embodiment extends in the axial direction of the joint body 3. The extension surface 352 is disposed radially outward of the outer peripheral surface of the tube body 2A.

The cap member 4 is a cylindrical member assembled to the opening 30 of the joint body 3. The cap member 4 of the present embodiment is assembled to the opening 30 by screw fastening. The cap member 4 is made of, for example, metal. The cap member 4 is formed in a tubular shape with the inside thereof as a cap side insertion space 40. The cap-side insertion space 40 communicates with the body-side insertion space 31 in a state where the cap member 4 is assembled to the joint body 3.

The cap member 4 of the present embodiment includes: a reduction portion 41 as a near-front end portion; a cap large diameter portion 42 formed integrally with the reduced portion 41 on the deep side of the reduced portion 41; a cap small diameter portion 43 integrally formed with the cap large diameter portion 42 on the deep side of the cap large diameter portion 42. The cap member 4 is made of metal or resin, and the cap member 4 of the present embodiment is made of metal.

The outer surface of the reduced portion 41 is formed in a cone shape by being reduced toward the near front side. An auxiliary seal ring accommodating portion 410 for accommodating the seal ring 8 (for example, the auxiliary seal ring 81) is formed on the inner surface of the reduced portion 41. The auxiliary seal ring 81 is in contact with the outer peripheral surface of the pipe body 2A and assists so as not to allow condensation formed on the outer peripheral surface of the pipe joint 1 in the pipe body 2A to intrude into the interior of the pipe joint 1, for example.

The cap large diameter portion 42 is a portion to be gripped by a tool. The cap large diameter portion 42 is held and rotated by a tool, whereby the cap member 4 is screw-mounted on the joint main body 3. The cap large diameter portion 42 has a cap side first contact surface 421 that contacts the body side first contact surface 321 of the body large diameter portion 32.

The cap-side first contact surface 421 is a surface perpendicular to the axial direction of the joint body 3. The cap-side first contact surface 421 is an annular surface.

The cap small diameter portion 43 is formed smaller in diameter than the cap large diameter portion 42. The cap small diameter portion 43 is integrally formed with the cap large diameter portion 42 via the cap side first contact surface 421.

The cap small diameter portion 43 has a small diameter portion depth side end surface 430 as a depth side end surface. The small diameter portion deep side end surface 430 is an annular surface. The small-diameter portion depth side end surface 430 is set longer in the radial direction than the main body side second contact surface 340. The small diameter portion deep side end surface 430 is a surface substantially perpendicular to the axial direction of the joint body 3.

Specifically, the small diameter portion depth side end surface 430 has a pressing surface 431 that presses the proximal lock ring 5D from the proximal side. The small-diameter portion depth side end surface 430 has a cap side second contact surface 432 that contacts the body side second contact surface 340 of the joint body 3. An annular concave portion (reference numeral omitted) is formed between the pressing surface 431 and the cap-side second contact surface 432 in the small-diameter portion deep-side end surface 430.

The pressing surface 431 is disposed at a distance from the engagement surface 341 of the joint body 3 in the axial direction of the joint body 3. The pressing surface 431 of the present 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. Then, in a state where an extraction force acts on the tube body 2A, the pressing surface 431 is in contact with the near-front lock ring 5D. The radially inner portion of the pressing surface 431 and the radially outer portion of the pressing surface 431 are chamfered in this embodiment. The inner front edge 433 of the pressing surface 431 and the inner front edge 343 of the locking surface 341 are disposed at the same position in the radial direction.

The cap side second abutment surface 432 is machined, for example, as a smooth surface. The cap-side second contact surface 432 is disposed on the stepped surface 350 side and on the inner side with respect to the external thread of the main body large diameter portion 32 of the joint main body 3.

The cap small diameter portion 43 of the present embodiment has a guide surface 434 extending from an inner front end edge 433 of the pressing surface 431 to the near front side. The guide surface 434 extends in, for example, the axial direction of the joint main body 3. In addition, the guide surface 434 is disposed radially outward of the outer peripheral surface of the tube body 2A.

A cap-side large-diameter seal ring accommodating portion 420 is formed at a portion near the outer surface of the cap small-diameter portion 43 in the present embodiment, and the cap-side large-diameter seal ring accommodating portion 420 accommodates the large-diameter seal ring 80 through an inner diameter side portion. An external thread that is screwed with the internal thread of the main body large diameter portion 32 of the joint main body 3 is formed on the outer surface of the cap small diameter portion 43 at a position on the deeper side than the cap side large diameter seal ring housing portion 420.

An annular cap-side small-diameter seal ring accommodating portion 435 for accommodating the seal ring 8 (for example, the small-diameter seal ring 82) is formed on the inner surface of the cap small-diameter portion 43. The cap-side small-diameter seal ring housing portion 435 is disposed so as to be separated from each other in the axial direction of the joint body 3.

In the pipe joint 1 of the present embodiment, the pipe joint portion 7A having the above-described structure is formed as a pair of laterally symmetrical pipe joint portions 7B and is integrally formed. In the pipe joint 1, the pair of lock rings 5 are housed in the joint body 3 side by side in the axial direction of the joint body 3 in a state in which the flange 50 is located radially inward of the inner surface of the joint body 3 and the claws 52 extend toward the inner diameter side to the depth side. In the cap member 4, the small diameter seal ring 82 is attached to the cap side small diameter seal ring housing 435, and the large diameter seal ring 80 is attached to the cap side large diameter seal ring housing 420 through the inner diameter side portion thereof. In this way, the cap small diameter portion 43 of the cap member 4 is inserted into the opening portion 30 of the joint body 3 in a state where the respective members are mounted in the joint body 3 and the cap member 4, respectively, and assembled by screw fastening of the male screw and the female screw. Thereby, the joint body 3 and the cap member 4 are integrated, and the body-side insertion space 31 communicates with the cap-side insertion space 40, thereby forming an insertion space for the pipe body 2A.

When the cap member 4 is assembled to the opening 30 of the joint body 3 by screw tightening of the male screw and the female screw, the cap large diameter portion 42 is gripped with a tool, and the cap member 4 is rotated, thereby tightening the cap member 4 to the joint body 3. In this way, the outer diameter side portion of the large diameter seal ring 80 is accommodated in the main body side large diameter seal ring accommodating portion 320.

The large-diameter seal ring 80 is clamped between the outer surface of the cap-side large-diameter seal ring housing 420 and the inner surface of the body-side large-diameter seal ring housing 320, and is compressed. Thus, the gap between the inner surface of the main body large diameter portion 32 and the outer surface of the cap small diameter portion 43 is sealed on the outer side in the axial direction with respect to the screwed portion of the male screw and the female screw.

The pair of lock rings 5 are arranged in parallel in the lock ring housing 310 so as to contact each other in the axial direction of the joint body 3. Since the pair of lock rings 5 have the same structure, the explanation of the structure of one lock ring 5 will be made as the explanation of the other lock ring 5.

As shown in fig. 2, the lock ring 5 has: an annular flange 50 centered on the axial direction of the joint body 3; an annular claw holding portion 51 formed to be bent from an end 500 of the flange 50 toward the center of the flange 50; a plurality of claws 52 formed to be bent toward the axial direction of the joint body 3 toward the inner surface side of the claw holding portion 51. The lock ring 5 is provided with an annular space 53 surrounded by the flange 50, the claw holding portion 51, and the claw 52.

The thickness of the lock ring 5 of the present embodiment is the same at any portion. The lock ring 5 of the present embodiment is made of metal.

The flange 50 of the present embodiment extends in the axial direction of the joint body 3. The flange outer surface 501 located radially outward of the flange 50 is, for example, a plane extending in the axial direction. The flange inner surface 502 located radially inward of the flange 50 is, for example, a plane extending in the axial direction. Chamfering is performed on both the flange outer surface 501 and the flange inner surface 502 at the proximal front side.

The claw holding portion 51 of the present embodiment extends in a direction perpendicular to the axial direction of the joint main body 3. The pawl holding depth side surface 510 located on the depth side of the pawl holding portion 51 is a plane extending in a direction perpendicular to the axial direction, for example. The jaw retaining proximal side surface 511 located on the proximal side of the jaw retaining portion 51 is a plane extending in a direction perpendicular to the axial direction, for example. Chamfering is performed to the radially inner portion of the claw holding depth side surface 510 and the claw holding proximal front side surface 511.

In the lock ring 5 of the present embodiment, the claws 52 are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the claw holding portion 51. Each claw 52 is bent so as to be inclined toward the insertion direction (deep side) of the pipe body 2A. The claw 52 is formed by bending from the claw holding portion 51 to the deep side in the axial direction of the joint body 3. As shown in fig. 3, the outer diameter of the claw 52 is formed in an arc shape. As shown in fig. 3 (b), the diameter of the virtual circle C of the distal ends 520 of the coupling claws 52 is slightly smaller than the outer diameter of the pipe body 2A. That is, the tip 520 of the claw 52 is located radially inward of the extension surface 352 and the guide surface 434 (see fig. 2).

The radially outer (proximal) jaw outer surface 521 of the jaw 52 is, for example, planar. The radially inner (deep side) jaw inner surface 522 of the jaw 52 is, for example, a plane.

The pair of lock rings 5 are accommodated 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 (e.g., the body-side facing surface 342) of the joint body 3, and are configured such that the claws 52 engage with the outer peripheral surface of the inserted pipe body 2A to restrict the removal of the pipe body 2A.

In addition, when a pulling-out force acts on the tube body 2A in the pair of lock rings 5, the proximal lock ring 5D abuts on the pressing surface 431 of the cap member 4, thereby restricting the movement thereof toward the proximal side.

The pawl abutment ring 6 is received in the annular space 53 of the lock ring 5. The claw contact ring 6 is accommodated in the annular space 53 in a state that allows displacement movement in the radial direction. The claw contact ring 6 of the present embodiment is made of metal.

The claw contact ring 6 has a claw contact surface 60, and the claw contact surface 60 is disposed on the front side of the claw 52 of the depth side lock ring 5C, and when the claw 52 of the depth side lock ring 5C is deformed toward the front side, the claw contact surface 60 contacts the claw 52 from the front side. The claw contact ring 6 of the present embodiment has a claw holding contact surface 61, and the claw holding contact surface 61 is located radially outward of the claw contact surface 60 and in front of the claw holding portion 51 of the depth side lock ring 5C. The pawl contact ring 6 has a deformation support surface 62, and the deformation support surface 62 contacts the pawl holding portion 51 of the near-front lock ring 5D from the deep side.

The claw contact ring 6 of the present embodiment includes: a ring bottom surface 63 located radially inward of the claw abutment ring 6; the surface located radially outward of the pawl abutment ring 6 is the ring top surface 64. The claw contact ring 6 has a connection surface 65 that connects the inner front end edge of the deformation support surface 62 and the proximal front end edge of the ring bottom surface 63.

The pawl contact surface 60 is, for example, a surface that contacts a portion of the depth-side lock ring 5C other than the tip portion 520 of the pawl 52. The claw contact surface 60 is a surface located radially inward and further toward the depth side of the claw contact ring 6. The claw contact surface 60 of the present embodiment is disposed between the claw 52 of the deep side lock ring 5C and the claw 52 of the near side lock ring 5D. That is, the claws 52 of the deep side lock ring 5C, the claw contact surface 60, and the claws 52 of the near side lock ring 5D are arranged in this order from the deep side toward the near side of the joint body 3.

Further, the claw abutment surface 60 extends parallel to the claw holding abutment surface 61. The pawl abutment surface 60 may be planar or curved, but is planar, for example. The claw contact surface 60 is a surface perpendicular to the axial direction of the joint body 3.

The claw contact surface 60 of the present embodiment is continuous with the claw holding contact surface 61 in the radial direction. In addition, the claw abutment surface 60 of the present embodiment is flush with the claw holding abutment surface 61.

The claw contact ring 6 of the present embodiment is arranged as follows: the distance between the inner tip edge 600 of the claw contact surface 60 and the axial center α of the joint body 3 coincides with the distance between the inner tip edge 343 of the engagement surface 341 of the joint body 3 and the axial center α of the joint body 3. The distance between the inner tip edge 600 of the claw contact surface 60 and the axial center α of the joint body 3 is also equal to the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axial center α of the joint body 3. As the inner front edge of the portion where chamfering is performed like the locking surface 341 or the pressing surface 431, the inner front edge before chamfering (in the case where chamfering is not performed) is used.

In the claw contact ring 6, the claws 52 of the deep side lock ring 5C extend radially inward from the claw contact surface 60. The claws 52 of the proximal lock ring 5D of the present embodiment extend radially inward from the claw contact surface 60.

The pawl holding contact surface 61 is, for example, a surface that contacts the pawl holding portion 51 of the deep side lock ring 5C. Specifically, the pawl holding abutment surface 61 abuts against the pawl holding proximal surface 511 of the depth side lock ring 5C. The pawl holding contact surface 61 is a surface located radially outward and deep from the pawl contact ring 6. The claw holding abutment surface 61 extends further radially outward from the radially outer end edge of the claw abutment surface 60.

The pawl holding abutment surface 61 of the present embodiment is disposed between the pawl holding portion 51 of the deep side lock ring 5C and the pawl holding portion 51 of the near side lock ring 5D. That is, the claw holding portion 51 of the depth-side lock ring 5C, the claw holding abutment surface 61, and the claw holding portion 51 of the near-side lock ring 5D are arranged in this order from the depth side toward the near-front side of the joint main body 3.

In addition, the pawl holding abutment surface 61 may be a flat surface or a curved surface, but is, for example, a flat surface. The pawl holding contact surface 61 is a surface perpendicular to the axial direction of the joint body 3. The radially outer portion of the claw holding contact surface 61 is chamfered.

The deformation support surface 62 abuts against the claw retaining depth side surface 510 of the near-front side lock ring 5D. The deformation support surface 62 is a surface located radially outward and forward of the claw abutment ring 6. The deformation support surface 62 of the present embodiment is disposed between the claw holding portion 51 of the deep side lock ring 5C and the claw holding portion 51 of the near side lock ring 5D. That is, the claw holding portion 51 of the deep side lock ring 5C, the deformation support surface 62, and the claw holding portion 51 of the near side lock ring 5D are arranged in this order from the deep side toward the near side of the joint body 3.

In addition, 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 or the claw holding abutment surface 61. The deformation support surface 62 is disposed so as to be separated from the jaw retaining contact surface 61 toward the depth side.

The radially outer portion of the deformation support surface 62 is chamfered. The distance (dimension) between the deformation support surface 62 and the claw holding contact surface 61 in the axial direction of the joint body 3 may be such that the claw contact ring 6 is held by the pair of lock rings 5 while being allowed to move in a misalignment in the radial direction. For example, in the axial direction of the joint main body 3, the distance between the deformation support surface 62 and the pawl holding abutment surface 61 coincides with the distance between the pawl holding depth side surface 510 of the near-front side lock ring 5D and the pawl holding near-front side surface 511 of the deep side lock ring 5C.

The ring bottom surface 63 extends proximally and frontward from the inner front end edge of the claw abutment surface 60. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. The ring bottom surface 63 is located radially outward of the tip 520 of the claw 52 of the lock ring 5.

As shown in fig. 4, the ring bottom 63 is, for example, an annular surface. The ring bottom 63 may be a flat or curved surface, but is, for example, a flat surface. The ring bottom surface 63 extends 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 is equal to 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).

The ring top surface 64 extends between the outer end edge of the pawl holding abutment surface 61 and the outer end edge of the deformation support surface 62. The ring top surface 64 may be a flat surface or a curved surface, but may be a flat surface, for example. In addition, the ring top surface 64 extends parallel to the flange inner surface 502 of the proximal locking ring 5D. The deep side portion and the near front side portion of the ring top surface 64 of the present embodiment are chamfered.

The ring top surface 64 extends juxtaposed with the flange inner surface 502 of the proximal locking ring 5D, for example. The ring top surface 64 is disposed so as to be radially inward apart from the flange inner surface 502 of the proximal lock ring 5D. The distance between the ring top surface 64 and the flange inner surface 502 in the radial direction in this embodiment is equal at any position in the axial direction of the joint body 3 except for the position where the ring top surface 64 is chamfered.

The connection surface 65 is disposed on the front side of the claw contact surface 60. The connection surface 65 may be a flat surface or a curved surface, but may be a flat surface, for example. The connection surface 65 is disposed between the radially outer portion of the claw holding portion 51 and the claw 52 of the deep side lock ring 5C and the radially outer portion of the claw holding portion 51 and the claw 52 of the near side lock ring 5D. The connection surface 65 is disposed so as to be separated radially inward from the claw inner surface 522 of the proximal lock ring 5D.

In the pipe joint 1 described above, since the claw contact surface 60 is provided on the claw contact ring 6, even if the pulling-out force acts on the pipe body 2A and the force toward the front side acts on the claw 52 of the depth-side lock ring 5C, the claw 52 deforms toward the front side, and the claw 52 comes into contact with the claw contact surface 60. At this time, the claw abutment ring 6 is allowed to move in the annular space 53 in a radially displaced manner. Specifically, the deep side lock ring 5C and the near side lock ring 5D are surrounded by the flange 50 in the radial direction, and the near side lock ring 5D is restricted from moving toward the near side by abutting against the pressing surface 431. In such a deep side locking ring 5C and a near side locking ring 5D, since the claw contact ring 6 is allowed to be displaced in the radial direction, the claw contact ring 6 is centered by contact with the claw 52 of the deep side locking ring 5C, and thus, the axial center of the claw contact ring 6 and the axial center of the tube body 2A are arranged in agreement. Thus, the claws 52 provided on the deep side lock ring 5C are uniformly in contact with the claw contact surfaces 60.

Further, with further advancement of the tube body 2A removal, in a state where the claws 52 of the depth side lock ring 5C are along the claw contact surfaces 60 of the claw contact ring 6, the portions of the claws 52 located radially inward of the claw contact surfaces 60 bite into the tube body 2A, so that the tube body 2A removal can be sufficiently restricted.

In the pipe joint 1 of the above embodiment, the claw contact surface 60 is a surface perpendicular to the axial direction of the joint body, that is, a surface extending in a direction perpendicular to the pull-out direction of the pipe body 2A. Therefore, even if the pipe body 2A is further pulled out to exert a force on the claw abutment surface 60, the claw abutment surface 60 can effectively support the claws 52 of the depth side lock ring 5C.

In the pipe joint 1 of the above embodiment, the pawl holding contact surface 61 is located radially outward of the pawl contact surface 60 and is located on the front side of the pawl holding portion 51 of the deep side lock ring 5C. Accordingly, when the pulling-out force is generated on the pipe body 2A, the claw holding contact surface 61 contacts the claw holding portion 51 of the deep side lock ring 5C from the near side, and therefore, the deformation of the claw holding portion 51 can be reliably restricted.

In the pipe joint 1 of the above embodiment, the deformation support surface 62 is in contact with the claw holding portion 51 of the near-front lock ring 5D from the deep side. Therefore, even if the pulling-out force is generated in the pipe body 2A, the claws 52 of the depth-side lock ring 5C are deformed, and pressure is applied to the claw contact surface 60 and the claw holding contact surface 61, the deformed support surface 62 can support the claw contact ring 6 without shifting the claw contact surface 60 and the claw holding contact surface 61 to the depth side.

In the pipe joint 1 of the above embodiment, the claw contact ring 6 is disposed so that the distance between the ring bottom surface 63 of the claw contact ring 6 and the axial center α of the joint body 3 coincides with the distance between the inner front end edge 343 of the engagement surface 341 of the joint body 3 and the axial center α of the joint body 3. Thus, the ring bottom surface 63 of the claw abutment ring 6 is arranged to be separated from the axial center α of the joint body 3 to the same extent as the inner front end edge 343 of the engagement surface 341 of the joint body 3. Therefore, when the pipe body 2A is inserted into the joint body 3, the claw contact ring 6 is prevented from interfering with the pipe body 2A, and when the pipe body 2A is subjected to the pulling-out force, the claw 52 of the deep-side lock ring 5C can be brought into contact with the claw contact surface 60 at the maximum range, and the claw 52 can be bitten into the pipe body 2A.

The present invention has been described with reference to one embodiment, but the present invention is not limited to the embodiment.

The claw contact ring 6 of the above embodiment has the claw holding contact surface 61, the deformation support surface 62, and the like in addition to the claw contact surface 60, but may have at least the claw contact surface 60. For example, the claw abutment ring 6 may also have no claw holding abutment surface 61. The pawl abutment ring 6 may not have the deformation support surface 62.

The claw contact surface 60 in the above embodiment is a surface perpendicular to the axial direction of the joint body 3, but may be a surface inclined to the axial direction. For example, the claw abutment surface 60 may also extend in the direction in which the claws 52 of the deep side lock ring 5C extend. The embodiment of the claw contact ring 6 having such a structure will be described in detail below with reference to fig. 5 to 7. The structure other than the claw contact ring 6 is the same as that described above.

As shown in fig. 5 and 6, the claw contact ring 6 is accommodated in the annular space 53 of the lock ring 5. The claw contact ring 6 of the present embodiment is housed in a state in which the annular space 53 is allowed to move in a radially displaced manner (see fig. 6). The claw contact ring 6 of the present embodiment is made of metal.

The pawl contact ring 6 is disposed on the front side of the pawl 52 of the depth side lock ring 5C, and has a pawl contact surface 60 that contacts the pawl 52 from the front side when the pawl 52 of the depth side lock ring 5C is deformed toward the front side. The claw contact ring 6 of the present embodiment has a claw holding contact surface 61 located on the front side of the claw holding portion 51 of the deep side lock ring 5C on the radial outer side of the claw contact surface 60. The pawl contact ring 6 has a deformation support surface 62 that contacts the pawl holding portion 51 of the near-front lock ring 5D from the deep side.

The claw contact ring 6 of the present embodiment has a ring bottom surface 63 as a ring bottom surface portion located radially inward of the claw contact surface 60. In addition, the claw abutment ring 6 has a ring top surface 64 located radially outward. The claw abutment ring 6 has a near-front connection surface 65 connecting the inner front edge of the deformation support surface 62 and the near-front edge of the ring bottom surface 63. The claw contact ring 6 has a deep-side connecting surface 66 connecting the inner front end edge of the claw contact surface 60 and the deep-side end edge of the ring bottom surface 63.

The pawl contact surface 60 is, for example, a surface that contacts a portion of the pawl 52 of the depth-side lock ring 5C other than the tip 520. Specifically, the claw contact surface 60 faces a radially outer portion (for example, a portion less than half of a radially outer portion of the claw 52) of the depth-side lock ring 5C. Further, the claw contact surface 60 is separated from a radially outer portion of the claws 52 of the depth-side lock ring 5C.

The claw contact surface 60 is a surface located radially inward and further toward the depth side of the claw contact ring 6. The claw contact surface 60 of the present embodiment is disposed between the claw 52 of the deep side lock ring 5C and the claw 52 of the near side lock ring 5D. That is, the claws 52 of the deep side lock ring 5C, the claw contact surface 60, and the claws 52 of the near side lock ring 5D are arranged in this order from the deep side toward the near side of the joint body 3.

Further, the claw abutment surface 60 extends in the direction in which the claws 52 of the depth side lock ring 5C extend. For example, the pawl abutment surface 60 extends in a different direction than the pawl holding abutment surface 61. The claw abutment surface 60 and the claw holding abutment surface 61 of the present embodiment are continuous in the radial direction.

The jaw abutment surface 60 has an extended front end 601. The extending distal end portion 601 is disposed so as to be separated from the proximal side surface of the claws 52 of the depth-side lock ring 5C, that is, the radially inner distal end edge of the claw outer surface 521, by a predetermined distance radially outward. The pawl abutment surface 60 may be planar or curved, but is planar, for example.

The claw contact ring 6 of the present embodiment is configured to: the distance between the inner tip edge 600 of the claw contact surface 60 and the axial center α of the joint body 3 is larger than the distance between the inner tip edge 343 of the engagement surface 341 of the joint body 3 and the axial center α of the joint body 3. Further, the distance between the inner tip edge 600 of the claw contact surface 60 and the axial center α of the joint body 3 is larger than the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axial center α of the joint body 3. As the inner distal end edge of the portion where chamfering is performed like the locking surface 341 or the pressing surface 431, the inner distal end edge before chamfering (if chamfering is not performed) of the portion is used.

In the claw contact ring 6, the claws 52 of the deep side lock ring 5C extend radially inward of the claw contact surface 60. The claws 52 of the proximal lock ring 5D of the present embodiment extend radially inward of the claw contact surface 60.

The pawl holding abutment surface 61 of the present embodiment is arranged between the pawl holding portion 51 of the deep side lock ring 5C and the pawl holding portion 51 of the near side lock ring 5D. That is, the claw holding portion 51 of the depth-side lock ring 5C, the claw holding abutment surface 61, and the claw holding portion 51 of the near-side lock ring 5D are arranged in this order from the depth side toward the near-front side of the joint main body 3.

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

The deformation support surface 62 may be a flat surface or a curved surface, but may be a flat surface, for example. The deformation support surface 62 is a surface perpendicular to the axial direction of the joint body 3. The deformation support surface 62 is parallel to the claw abutment surface 60 and the claw holding abutment surface 61. The deformation support surface 62 is disposed so as to be separated from the jaw retaining contact surface 61 toward the depth side.

The radially outer portion of the deformation support surface 62 is chamfered. The distance (dimension) between the deformation support surface 62 and the pawl holding contact surface 61 in the axial direction of the joint body 3 may be such that the pawl holding contact surface is sandwiched between the pair of lock rings 5 while allowing the pawl contact ring 6 to move in a radial direction, and may be, for example, equal to the distance between the pawl holding deep side surface 510 of the near-front lock ring 5D and the pawl holding near-front side surface 511 of the near-front lock ring 5C.

As shown in fig. 7, the ring bottom 63 is, for example, an annular surface. The ring bottom 63 may be a flat or curved surface, but is, for example, a flat surface. The ring bottom surface 63 extends 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 is equal to the distance between the extension surface 352 of the joint body 3 and the axial center α of the joint body 3 (see fig. 6).

Moreover, the ring top surface 64 extends side by side with the flange inner surface 502 of the proximal locking ring 5D, for example. The ring top surface 64 is disposed so as to be separated radially inward from the flange inner surface 502 of the proximal lock ring 5D. The distance between the ring top surface 64 and the flange inner surface 502 in the radial direction in this embodiment is equal at any position in the axial direction of the joint body 3 except for the chamfered position of the ring top surface 64.

The front-side connecting surface 65 is disposed on the front side of the jaw abutment surface 60. The proximal connecting surface 65 may be a flat surface or a curved surface, but may be a flat surface, for example. The front-side connecting surface 65 is disposed between the radially outer portions of the claw holding portions 51 of the deep-side lock ring 5C and the claws 52, and between the radially outer portions of the claw holding portions 51 of the front-side lock ring 5D and the claws 52. The proximal connecting surface 65 is disposed in a state of being separated radially inward with respect to the claw inner surface 522 of the proximal lock ring 5D.

The deep-side connecting surface 66 is disposed on the deep side of the claw contact surface 60. The deep-side connecting surface 66 may be a flat surface or a curved surface, but may be a flat surface, for example. The deep-side connection surface 66 is a surface perpendicular to the axial direction of the joint body 3. The deep-side connecting surface 66 extends radially inward from the inner front end edge 600 of the claw contact surface 60.

The depth-side connecting surface 66 is arranged between the claw 52 of the depth-side lock ring 5C and the claw 52 of the near-front-side lock ring 5D. The deep-side connecting surface 66 is arranged in a state of being separated toward the proximal side with respect to the claw outer surface 521 of the proximal-side lock ring 5D. The inner distal end 660 of the depth-side connecting surface 66 of the present embodiment is located radially outward of the inner distal ends of the claws 52 of the depth-side lock ring 5C and the claws 52 of the near-front lock ring 5D.

The claw contact ring 6 of the present embodiment is arranged such that the distance between the inner distal end 660 of the deep-side connecting surface 66 and the axial center α of the joint body 3 coincides with the distance between the inner distal end 343 of the locking surface 341 of the joint body 3 and the axial center α of the joint body 3. The distance between the inner tip edge 660 of the deep-side connecting surface 66 and the axial center α of the joint body 3 coincides with the distance between the inner tip edge 433 of the pressing surface 431 of the cap member 4 and the axial center α of the joint body 3.

In the pipe joint 1 described above, the claw contact surface 60 extending in the direction in which the claws 52 of the lock ring 5 extend is provided on the claw contact ring 6, and therefore, even if an extraction force acts on the pipe body 2A, the claws 52 of the deep-side lock ring 5C deform toward the front side, and the claws 52 come into contact with the claw contact surface 60. At this time, since deformation of the claws 52 of the deep-side lock ring 5C is regulated by the claw contact surface 60, a portion (for example, the distal end portion 520) of the claws 52 located radially inward of the claw contact surface 60 sufficiently bites into the pipe body 2A, and hence, removal of the pipe body 2A can be sufficiently regulated.

In the pipe joint 1 of the above embodiment, since the extending distal end portion of the claw contact surface 60 is separated from the radially inner distal end portion of the proximal side surface of the claws 52 of the depth-side lock ring 5C by a predetermined distance radially outward, and since the distal end portion 520 of the claws 52 of the depth-side lock ring 5C is separated from the claw contact surface 60, when the pulling-out force is generated on the pipe body 2A, the distal end portion 530 of the claws 52 of the depth-side lock ring 5C is reliably deformed and bites into the pipe body 2A, and thus the pulling-out of the pipe body 2A can be reliably restricted.

In the pipe joint 1 according to the above embodiment, since the ring bottom surface 63 is planar, even if the ring bottom surface 63 contacts the pipe body 2A, the ring bottom surface 63 does not damage the pipe body 2A. Further, since the ring bottom surface 63 is planar, strength of the claw contact ring 6 at the side of the ring bottom surface 63 is ensured, and even if the claw 52 of the depth side lock ring 5C is deformed by the pulling-out force generated in the pipe body 2A, the ring bottom surface 63 can support the claw contact surface 60 so as not to be deviated to the depth side.

The claw contact ring 6 of the above embodiment has the claw holding contact surface 61, the deformation support surface 62, and the like in addition to the claw contact surface 60, but may have at least the claw contact surface 60. For example, the claw contact ring 6 may not have the claw holding contact surface 61 and the deformation support surface 62. The claw abutment ring 6 may not have the ring bottom surface 63.

The claw contact ring 6 of the above embodiment is accommodated in the annular space 53 in a state that allows displacement movement in the radial direction, but is not limited thereto. For example, the claw abutment ring 6 may be housed in the annular space 53 in a radially fixed state. In this case, the ring top surface 64 is arranged to extend, for example, side by side with the flange inner surface 502 of the near-front side locking ring 5D and in a state of abutting against the flange inner surface 502 of the near-front side locking ring 5D.

The extending tip 601 of the claw contact surface 60 of the above embodiment is disposed apart from the radially inner tip of the claw outer surface 521 of the depth-side lock ring 5C by a predetermined distance to the radially outer side, but is not limited thereto. For example, the extended tip 601 of the claw contact surface 60 may also contact the radially inner tip of the claw outer surface 521 of the depth-side lock ring 5C.

The ring bottom surface 63 of the claw abutment ring 6 in the above embodiment is a flat surface, but may be a curved surface. For example, the ring bottom surface 63 may be a curved surface having a convex shape toward the radial inner side.

The plurality of claws 52 of the lock ring 5 of the above embodiment are arranged at equal intervals in the circumferential direction, but may be arranged at different intervals in the circumferential direction.

The cap member 4 of the above embodiment is assembled to the joint main body 3 by screw fastening, but may be assembled by other methods such as fitting.

The pipe joint of the present invention is a pipe joint for connecting a pipe body, comprising: a tubular joint body provided with an opening through which the pipe body is inserted, the pipe body being inserted to a deep side through the opening, a tubular cap member assembled to the opening, a pair of locking rings including a deep side locking ring disposed on the deep side of the joint body and a near side locking ring disposed on the near side of the joint body, each locking ring having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; the present invention provides a pipe joint including a joint body having a plurality of radially inner surfaces, a plurality of radially outer surfaces, and a plurality of radially inner surfaces, the plurality of radially outer surfaces being formed by bending the plurality of radially outer surfaces of the plurality of radially outer surfaces, the plurality of radially inner surfaces being formed by bending the plurality of radially outer surfaces of the plurality of radially outer surfaces, the plurality of radially outer surfaces being formed by bending the plurality of radially outer surfaces of the plurality of radially outer surfaces, and the plurality of radially inner surfaces being formed by bending the plurality of radially outer surfaces of the plurality of radially inner surfaces.

According to this structure, since the claw contact surface is provided on the claw contact ring, even if the pulling-out force acts on the pipe body, the claw of the deep-side lock ring deforms toward the front side, and the claw comes into contact with the claw contact surface. At this time, since the claw contact ring moves in the annular space with a displacement in the radial direction, the claw contact ring is centered by contact with the claw of the deep side lock ring, and the axis of the claw contact ring is aligned with the axis of the inserted pipe body. Therefore, the claws provided on the deep-side lock ring are uniformly brought into contact with the claw contact surfaces, respectively. Further, when the pipe body is further pulled out, the claw of the deep-side lock ring bites into the pipe body in a state along the claw contact surface of the claw contact ring, and therefore, the pulling out of the pipe body can be sufficiently restricted.

According to this configuration, since the claw contact surface is a surface that extends in the direction perpendicular to the pulling-out direction of the pipe body, the claw contact surface can effectively support the claw of the deep-side lock ring even if a force acts on the claw contact surface as the pipe body is pulled out.

In the pipe joint, the claw contact ring may further include a claw holding contact surface located on a front side of the claw holding portion of the depth side lock ring in a radial direction outside of the claw contact surface.

According to this configuration, when the pulling-out force is generated on the pipe body, the claw holding contact surface contacts the claw holding portion of the deep-side lock ring from the near side, so that the deformation of the claw holding portion can be reliably restricted.

In the pipe joint, the claw contact ring may further have a deformation support surface that contacts the claw holding portion of the near-front lock ring from the deep side.

According to this configuration, even if the claw of the depth-side lock ring is deformed by the pulling-out force generated on the pipe body, the deformed support surface can support the claw contact ring so as not to shift the claw contact surface and the claw holding contact surface toward the depth side.

In addition, in the pipe joint, the claw abutment surface may be further configured to: the distance between the inner front end edge of the claw abutting surface and the axis of the joint main body is consistent with the distance between the inner front end edge of the locking surface and the axis of the joint main body.

According to this configuration, the inner distal end edge of the claw abutment ring is disposed apart from the axial center of the joint body to the same extent as the inner distal end edge of the pressing surface of the cap member. Therefore, the claw contact ring can be prevented from interfering with the pipe body when the pipe body is inserted into the joint body. In addition, when the pulling-out force is generated on the pipe body, the claw of the deep-side locking ring can be maximally abutted against the claw abutment surface, so that the claw bites into the pipe body.

The present invention can provide a pipe joint capable of sufficiently restricting the removal of a pipe.

The pipe joint of the present invention is a pipe joint for connecting a pipe body, comprising: a tubular joint body provided with an opening through which the pipe body is inserted, the pipe body being inserted to a deep side through the opening, a tubular cap member assembled to the opening, a pair of locking rings including a deep side locking ring disposed on the deep side of the joint body and a near side locking ring disposed on the near side of the joint body, each locking ring having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; and a plurality of claws formed by bending from the claw holding portion to the deep side in the axial direction, wherein each of the locking rings is housed in the joint body side by side in the axial direction in a state in which the flange is located radially inside the inner surface of the joint body and the claws extend to the inner diameter side, wherein the claw contact ring is housed in an annular space surrounded by the flange of the near-front locking ring, the claw holding portion, and the claws, wherein the cap member has a pressing surface that presses the near-front locking ring from the near-front side, wherein the pair of locking rings are configured to restrict removal of the pipe body by the claws being locked to the outer peripheral surface of the inserted pipe body, wherein the claw contact ring is disposed at the near-front side of the claws of the deep side locking ring, and has a claw contact surface that contacts the claws from the near-front side when the claws of the deep side locking ring deform to the near-front side, wherein the claws of the deep side locking ring extend to the inside than the claw contact surface, and wherein the claw contact surface extends in the depth direction.

According to this configuration, since the claw contact surface is provided on the claw contact ring, even if the pulling-out force acts on the pipe body, the claw of the deep-side lock ring deforms toward the front side, and the claw comes into contact with the claw contact surface. At this time, since the deformation of the claws of the deep-side lock ring is restricted by the claw contact surfaces, the portions of the claws located radially inward of the claw contact surfaces bite into the pipe body sufficiently, and the pipe body can be pulled out sufficiently.

According to this configuration, since the radially inner tip portions of the claws of the depth-side lock ring are separated from the claw contact surface, when the pulling-out force is generated on the pipe body, the tip portions of the claws of the depth-side lock ring are reliably deformed and bite into the pipe body, and therefore, the pulling-out of the pipe body can be reliably restricted.

In the pipe joint, the claw contact ring has a planar or curved ring bottom surface on a radially inner side of the claw contact surface, and the ring bottom surface is located radially outward of a tip end portion of the claw of the depth side lock ring.

According to this structure, since the ring bottom surface is flat or curved, the ring bottom surface does not damage the pipe body even if the ring bottom surface contacts the pipe body.

The pipe joint of the present invention is a pipe joint for connecting a pipe body, comprising: a tubular joint body provided with an opening into which the pipe body is inserted, the pipe body being inserted to the deep side through the opening, a tubular cap member assembled to the opening, and a pair of lock rings each having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; the present invention provides a pipe joint including a joint body, a plurality of claws formed by bending in the axial direction on the inner surface side of the joint body, each of the locking rings being housed in the joint body side by side in the axial direction in a state in which the flange is located radially inside the inner surface of the joint body and the claws extend to the inner diameter side, the pair of locking rings including a deep side locking ring disposed on the deep side of the joint body and a near side locking ring disposed on the near side of the joint body, the cap member having a pressing surface for pressing the near side locking ring from the near side, the pair of locking rings being configured so that the claws are engaged with the outer circumferential surface of the pipe body to be inserted to restrict the removal of the pipe body, the pipe joint further including a claw abutment ring housed in the flange of the near side locking ring, the claw holding portion, and an annular space surrounded by the claws, the claw abutment ring being disposed on the near side of the claw of the deep side locking ring and having a contact surface for radially extending the claw from the near side of the deep side locking ring when the near side locking ring is deformed from the near side of the near side.

According to this configuration, since the radially inner tip portions of the claws of the depth-side lock ring are separated from the claw abutment surface, when the pulling-out force is generated on the pipe body, the tip portions of the claws of the depth-side lock ring are reliably deformed and bite into the pipe body, and therefore, the pulling-out of the pipe body can be reliably restricted.

Description of the reference numerals

1 Pipe joint, 2A, 2B pipe body, 3 joint main body, 4 cap member, 5 lock ring, 5C deep side lock ring, 5D near front side lock ring, 6 claw abutment ring, 7A, 7B pipe joint head, 8 seal ring, 20A deepest end face, 30 opening portion, 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 reduced portion, 42 cap large diameter portion, 43 cap small diameter portion, 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 (near front side connection surface), 66 deep side connection surface, 80 large diameter seal ring, 81 auxiliary seal ring, 82 small diameter seal ring, 101 a pipe joint, 103 a joint main body, 104 a cap member, 105 a locking ring, 150A flange, 151 a claw holding portion, 152A claw, 310A locking ring receiving portion, 320A main body side large diameter seal ring receiving portion, 321 a main body side first abutment surface, 340A main body side second abutment surface, 341 a locking surface, 342A main body side opposing surface, 343 an inner side front end edge, 350A stepped surface, 351 a stepped wall, 352 an extension surface, 410 an auxiliary seal ring receiving portion, 420A cap side large diameter seal ring receiving portion, 421 a cap side first abutment surface, 430A small diameter portion deep side end surface, 431 a pressing surface, 432A cap side second abutment surface, 433 an inner side front end edge, 434 a guide surface, 435 a cap side small diameter seal ring receiving portion, 500 an end portion, 501 a flange outer surface, 502A flange inner surface, 510A claw holding deep side, 511 … claw holding near front side, 520 … front end, 521 … claw outer surface, 522 … claw inner surface, 600 … inner front end edge, 601 … extending front end, 660 … inner front end edge, a … axis, C … imaginary circle.

Claims

1. A pipe joint, which is a pipe joint for connecting pipe bodies, comprising:

A tubular joint body provided with an opening into which the pipe body is inserted, the pipe body being inserted to the deep side through the opening;

A tubular cap member attached to the opening;

A pair of lock rings including a deep side lock ring disposed on a deep side of the joint body and a near side lock ring disposed on a near side of the joint body, each lock ring having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; a plurality of claws formed by bending from the claw holding portion to a depth side in the axial direction, wherein the pair of locking rings are housed in the joint main body side by side in the axial direction in a state in which the flange is located radially inward of an inner surface of the joint main body and the claws extend to the inner diameter side to the depth side; and

A claw contact ring accommodated in an annular space surrounded by the flange of the proximal lock ring, the claw holding portion, and the claw,

The joint body has a locking surface for locking with the deep side locking ring from the deep side,

The cap member has a pressing surface for pressing the proximal lock ring from the proximal side,

The pair of locking rings are accommodated in a space surrounded by the engagement surface of the joint main body, the pressing surface of the cap member, and the inner surface of the joint main body, and are configured to restrict the removal of the pipe body by the engagement of the claws on the outer peripheral surface of the pipe body to be inserted,

The claw contact ring is disposed on a front side of the claw of the depth side locking ring, and has a claw contact surface that contacts the claw from the front side when the claw of the depth side locking ring is deformed toward the front side,

The claws of the deep-side lock ring extend radially inward than the claw abutment faces,

The claw abutment ring is accommodated in the annular space in a state that allows displacement movement in the radial direction.

2. The pipe joint according to claim 1, wherein the claw abutment surface is a surface perpendicular to the axial direction.

3. The pipe joint according to claim 1 or 2, the claw abutment ring having a claw holding abutment surface located on a proximal front side of a claw holding portion of the depth side lock ring radially outside the claw abutment surface.

4. The pipe joint according to claim 1 or 2, the claw abutment ring having a deformed support surface that abuts the claw holding portion of the near-front side locking ring from the deep side.

5. The pipe joint according to claim 3, wherein the claw abutment ring has a deformed support surface that abuts the claw holding portion of the near-front side locking ring from the deep side.

6. The pipe joint according to claim 1 or 2, the claw abutment surface being configured to: the distance between the inner front end edge of the claw abutting surface and the axis of the joint main body is consistent with the distance between the inner front end edge of the locking surface and the axis of the joint main body.

7. The pipe joint according to claim 3, the pawl abutment surface configured to: the distance between the inner front end edge of the claw abutting surface and the axis of the joint main body is consistent with the distance between the inner front end edge of the locking surface and the axis of the joint main body.

8. The pipe joint according to claim 4, the pawl abutment surface configured to: the distance between the inner front end edge of the claw abutting surface and the axis of the joint main body is consistent with the distance between the inner front end edge of the locking surface and the axis of the joint main body.

9. The pipe joint according to claim 5, the pawl abutment surface configured to: the distance between the inner front end edge of the claw abutting surface and the axis of the joint main body is consistent with the distance between the inner front end edge of the locking surface and the axis of the joint main body.

10. A pipe joint, which is a pipe joint for connecting pipe bodies, comprising:

A tubular cap member attached to the opening;

A pair of lock rings including a deep side lock ring disposed on a deep side of the joint body and a near side lock ring disposed on a near side of the joint body, each lock ring having: an annular flange centered in an axial direction of the joint body; an annular claw holding portion formed by bending from the end of the flange to the center side of the flange; a plurality of claws formed by bending from the claw holding portion to a depth side in the axial direction, wherein the pair of locking rings are housed in the joint main body side by side in the axial direction in a state in which the flange is located radially inward of an inner surface of the joint main body and the claws extend to the inner diameter side to the depth side;

The pair of locking rings are configured to restrict the removal of the pipe body by the engagement of the claws on the outer peripheral surface of the pipe body to be inserted,

The pawl abutment surface extends in a direction in which the pawl of the deep side lock ring extends.

11. The pipe joint according to claim 10, wherein the extending tip portion of the claw abutment surface is disposed so as to be separated from a radially inner tip portion of a side surface of the depth-side lock ring on a proximal side by a predetermined distance to a radially outer side.

12. The pipe joint according to claim 10 or 11, wherein the claw abutment ring has a flat or curved ring bottom surface on a radially inner side than the claw abutment surface,

The ring bottom surface is located radially outward of the tip ends of the claws of the depth-side lock ring.