CN113167415A

CN113167415A - Pipe joint

Info

Publication number: CN113167415A
Application number: CN202080005903.2A
Authority: CN
Inventors: 寺田孝
Original assignee: Tanyuan Co ltd
Current assignee: Tanyuan Co ltd; Tabuchi Corp
Priority date: 2019-11-19
Filing date: 2020-09-14
Publication date: 2021-07-23
Also published as: WO2021100291A1

Abstract

The pipe joint of the present invention comprises: the joint body, the cap member, a depth side lock ring disposed on the depth side of the joint body, a near side lock ring disposed on the near side of the joint body, and a claw contact ring, wherein the lock ring is accommodated in a space surrounded by a locking surface of the joint body, a pressing surface of the cap member, and an inner surface of the joint body, and is configured to be locked to an outer peripheral surface of an inserted pipe body by a claw to restrict the removal of the pipe body, the claw contact ring is disposed on the near side of the claw of the depth side lock ring, and has a claw contact surface which is brought into contact with the claw from the near side when the claw of the depth side lock ring is deformed to the near side, the claw of the depth side lock ring extends radially inward of the claw contact surface, and the claw contact ring is accommodated in an annular space in a state that a radially-displaced movement is permitted.

Description

Pipe joint

Cross reference to related applications

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

Technical Field

The present invention relates to a pipe joint, and more particularly, to a pipe joint having a lock ring for restricting removal of an inserted pipe body.

Background

As such a pipe joint, patent document 1 below proposes a technique. As shown in fig. 8, the pipe joint 101 includes: a joint body 103 having a stepped surface in an inner depth portion thereof, the stepped surface being in contact with a deepest end of the pipe body; a cylindrical cap member 104 attached to the opening of the joint main body 103 by screwing; and a lock ring 105 received in the lock ring receiving portion of the joint body 103. In this pipe joint 101, the

pipe bodies

2A and 2B are inserted in a state where the joint main 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 extending in the axial direction; an annular claw holding portion 151 formed by bending from an end portion of the flange 150 toward a center side; a plurality of claws 152 formed by bending toward the inner surface side of the claw holding portion 151. Further, in a state where the flange 150 is in contact with the inner surface of the lock ring housing and extends in the depth direction with the claws 152 extending toward the inner diameter side, two lock rings 105 are arranged side by side on the depth side and the front side of the joint body 103, and the two lock rings 105 are sandwiched between the locking surface of the lock ring housing and the pressing surface of the cap member 104 (see fig. 8). When a removal force acts on the

pipes

2A and 2B inserted into the pipe joint 101, the claws 152 of the lock ring 105 bite into the outer surfaces of the

pipes

2A and 2B, and thus the removal of the

pipes

2A and 2B from the pipe joint 101 can be restricted.

Documents of the prior art

Patent document

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 positioned on the deep side is sandwiched and fixed by the flange of the lock ring on the near side and the locking 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. Therefore, the claws do not sufficiently bite into the pipe body, and the restriction of the removal of the pipe body 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 body.

Means for solving the problems

The pipe joint of the present invention is a pipe joint for connecting pipe bodies, and comprises: a tubular joint body having an opening into which the pipe body is inserted, the pipe body being inserted to a depth side through the opening; a cylindrical cap member attached to the opening; a pair of lock rings including a depth side lock ring disposed on a depth side of the joint body and a front side lock ring disposed on a front side of the joint body, each lock ring including: an annular flange centered on the axial direction of the joint body; an annular claw holding portion formed by bending from an end portion of the flange toward a center side of the flange; a plurality of claws formed by bending the claw holding portion to a depth side in the axial direction, wherein the pair of lock rings are housed in the joint main body side by side in the axial direction in a state where the flange is positioned radially inward of an inner surface of the joint main body and the claws extend to a depth side to an inner diameter side; a claw abutting ring which is accommodated in an annular space surrounded by a flange of the proximal lock ring, a claw holding portion, and claws, the joint body has a locking surface which is locked with the longitudinal lock ring from a depth side, the cap member has a pressing surface which presses the proximal lock ring from the proximal side, the pair of lock rings are accommodated in a space surrounded by the locking surface of the joint body, the pressing surface of the cap member, and an inner surface of the joint body, and is configured to restrict the removal of the pipe body by locking the claws to an outer peripheral surface of the inserted pipe body, the claw abutting ring is disposed on the proximal side of the claws of the longitudinal lock ring, and has claw abutting surfaces which abut the claws from the proximal side when the claws of the longitudinal lock ring are deformed toward the proximal side, the claws of the longitudinal lock ring extending radially inward of the claw abutting surfaces, the claw abutment ring is housed in the annular space in a state where a radially displaced movement is allowed.

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

In the pipe joint, the claw abutting ring may have a claw holding abutting surface located on a front side of the claw holding portion of the deep-side lock ring on a radially outer side of the claw abutting surface.

In the above pipe joint, the claw abutting ring may have a deformable support surface which abuts against the claw holding portion of the near-side lock ring from a depth 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 clamping surface and the axis of the joint main body.

The pipe joint of the present invention is a pipe joint for connecting pipe bodies, and is characterized by comprising: a tubular joint body having an opening into which the pipe body is inserted, the pipe body being inserted to a depth side through the opening; a cylindrical cap member attached to the opening; a pair of lock rings including a depth side lock ring disposed on a depth side of the joint body and a front side lock ring disposed on a front side of the joint body, each lock ring including: an annular flange centered on the axial direction of the joint body; an annular claw holding portion formed by bending from an end portion of the flange toward a center side of the flange; a plurality of claws formed by bending the claw holding portion to a depth side in the axial direction, wherein the pair of lock rings are housed in the joint main body side by side in the axial direction in a state where the flange is positioned radially inward of an inner surface of the joint main body and the claws extend to a depth side to an inner diameter side; and a claw abutting ring which is accommodated in an annular space surrounded by the flange of the proximal side lock ring, the claw holding portion, and the claws, wherein the cap member has a pressing surface which presses the proximal side lock ring from the proximal side, the pair of lock rings are configured to restrict the removal of the pipe body by the claws being locked to the outer peripheral surface of the inserted pipe body, the claw abutting ring is disposed on the proximal side of the claws of the depth side lock ring and has claw abutting surfaces which abut against the claws from the proximal side when the claws of the depth side lock ring are deformed to the proximal side, the claws of the depth side lock ring extend radially inward of the claw abutting surfaces, and the claw abutting surfaces extend in a direction in which the claws of the depth side lock ring extend.

In the pipe joint, the extending distal end portions of the claw contact surfaces are arranged to be spaced apart from radially inner distal end portions of the proximal side surfaces of the claws of the depth-side lock ring by a predetermined distance radially outward.

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 distal end portions of the claws of the depth-side lock ring.

Drawings

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

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

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

Figure 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 side view of a pipe joint according to a modification.

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

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

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

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

Figure 9B is a front view of a single locking ring of the fitting.

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, gas copper pipes for a cooling medium, and the like, which are examples of pipe bodies. In addition, the pressure in the case where medical gas, a coolant (including both gas and liquid), and the like are flowed through the pipe body is generally higher than the water pressure in the case where tap water is flowed through the pipe body, for example.

As shown in fig. 1, a pipe joint 1 is a pipe joint for connecting

pipe bodies

2A, 2B. The pipe joint 1 includes a joint body 3, a cap member 4, a plurality of lock rings 5, and a claw contact ring 6. The pipe joint 1 is configured by integrally forming a pair of

pipe joint portions

7A and 7B having a bilaterally symmetric structure at the center position in the axial direction (longitudinal direction) of the

pipe bodies

2A and 2B in order to connect the

pipe bodies

2A and 2B to be connected to each other. Therefore, in the following description, the description of the pipe joint portion 7A located on one side with respect to the center position will be referred to as the description of the other side structure.

The joint body 3 has a laterally symmetrical structure and is integrally formed, since it has one pipe joint portion 7A and the other pipe joint portion 7B. In the following description, even in the case of the joint main body 3 having a bilaterally symmetrical structure and being integrated, the joint main body 3 in the description of the one pipe joint portion 7A indicates only the region occupied by the one pipe joint portion 7A in the joint main body 3. Note that the reference numerals for the respective portions of the pipe joint portion 7A are also those for the same portions of the pipe joint portion 7B. The reference numerals used for the respective portions of the pipe joint portion 7B are also used for the same portions of the pipe joint portion 7A.

The structure of one pipe joint portion 7A will be described below. As also shown in fig. 2, the pipe 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 pipe joint portion 7A, the pair of lock rings 5 includes a depth side lock ring 5C disposed on the depth side of the joint body 3 and a front side lock ring 5D disposed in parallel with the depth side lock ring 5C on the front side of the joint body 3. The pipe joint portion 7A of the present embodiment includes 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 depth 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 body large diameter portion 32 located on the front side (right side in fig. 1) when the insertion of the pipe body 2A is started, and a body small diameter portion 33 located on the deep side (left side in fig. 1) after the insertion of the pipe body 2A is completed. The proximal side refers to the center side in the extending direction of the joint body 3. The depth side refers to an end edge side in the extending direction of the joint main body 3. The near side is a side close to the opening 30 of the joint body 3, and the deep side is a side far 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 metal and 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 a 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 depth side of the opening 30. The end portion of the body-side insertion space 31 on the depth side is reduced in diameter. The main body side insertion space 31 has a lock ring housing 310 at an end on the opening 30 side (end on the near side).

The diameter of the lock ring housing 310 is formed smaller than the opening 30 and larger than the end portion of the body-side insertion space 31 on the depth side. Further, the diameter of the lock ring housing 310 is set slightly larger than the outer diameter of the lock ring 5, whereby the lock ring 5 can be housed in the lock ring housing 310. The length of the lock ring receiving portion 310 in the axial direction of the joint body 3 is set to be able to receive the 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 to any portion in the axial direction (depth direction, left-right direction in fig. 1) of the joint main body 3. A female screw 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 housing portion 320 that houses 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 near 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 near side.

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

The first body small diameter portion 34 of the present embodiment is a tapered tube shape having an outer diameter that decreases as the portion located on the deeper side is located. The first body small diameter portion 34 has a body side second abutment surface 340 that abuts the cap member 4. The first body small diameter portion 34 has an engagement surface 341 that engages with the depth lock ring 5C from the depth side. The first body small diameter portion 34 has a body-side facing surface 342 located radially outward of the depth-side lock ring 5C and the near-side lock ring 5D and facing the depth-side lock ring 5C and the near-side lock ring 5D. The first body small diameter portion 34 of the present embodiment is a cylindrical shape having an equal outer diameter at any position in the axial direction of the joint body 3.

In the first body small diameter portion 34 of the present embodiment, the locking surface 341 and the body side facing 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 locking surface 341 is, for example, a surface perpendicular to the axial direction of the joint body 3. A radially inner portion of the locking surface 341 is chamfered.

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

The second 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 body small diameter portion 35 has a stepped wall 351 formed by reducing the diameter at the center in the axial direction of the joint body 3. Further, the second body small diameter portion 35 has an extension surface 352 extending from the step surface 350 to the near side.

The step surface 350 of the present embodiment is a surface perpendicular to the axial direction of the joint body 3. The step surface 350 is formed 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 locking surface 341 to the depth 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 pipe body 2A.

Cap member 4 is a cylindrical member assembled to opening 30 of 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 cylindrical shape with the inside thereof being 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 reduced portion 41 as an end portion on the front side; a cap large diameter portion 42 formed integrally with the reduced portion 41 on the depth side of the reduced portion 41; and a cap small diameter portion 43 formed integrally 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 conical shape by being reduced toward the front side. An auxiliary seal ring housing 410 for housing the seal ring 8 (e.g., the auxiliary seal ring 81) is formed on an 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 to assist in preventing, for example, dew condensation formed on the outer peripheral surface of the pipe joint 1 in the outside of the pipe joint 1 in the pipe body 2A from entering the inside of the pipe joint 1.

The cap large diameter portion 42 is a portion to be gripped by a tool. The cap large-diameter portion 42 is held with a tool and rotated, 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 abutment surface 421 that abuts against the main body side first abutment surface 321 of the main body large diameter portion 32.

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

The cap small diameter portion 43 is formed to be smaller in diameter than the cap large diameter portion 42. Further, the cap small-diameter portion 43 is formed integrally 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 depth side end surface 430 is an annular surface. Further, the small-diameter portion depth side end surface 430 is set to have a longer length in the radial direction than the main body side second contact surface 340. The small-diameter portion depth-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 front side lock ring 5D from the front 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. In the small-diameter portion depth-side end surface 430, an annular recess (reference numeral omitted) is formed between the pressing surface 431 and the cap-side second abutment surface 432.

The pressing surface 431 and the locking surface 341 of the joint body 3 are arranged at a distance 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. In addition, when the pulling-out force acts on the tube body 2A, the pressing surface 431 abuts against the front side lock ring 5D. The pressing surface 431 and the pressing surface 431 of the present embodiment are chamfered at a radially inner portion and a radially outer portion. Further, the inner front end edge 433 of the pressing surface 431 and the inner front end edge 343 of the locking surface 341 are arranged at the same position in the radial direction.

The cap-side second abutment surface 432 is machined to be 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 screw 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 side. The guide surface 434 extends, for example, in the axial direction of the joint main body 3. The guide surface 434 is disposed radially outward of the outer peripheral surface of the pipe body 2A.

A cap-side large-diameter seal ring housing portion 420 is formed in a portion on the front side of the outer surface of the cap small-diameter portion 43 of the present embodiment, and the cap-side large-diameter seal ring housing portion 420 houses the large-diameter seal ring 80 through an inner diameter side portion. A male screw to be screwed with the female screw 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 located on the deeper side than the cap side large diameter seal ring housing portion 420.

An annular cap-side small-diameter seal ring housing 435 for housing the seal ring 8 (e.g., 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 435 is disposed so as to be separated in the axial direction of the joint main body 3.

In the pipe joint 1 of the present embodiment, the pipe joint portion 7A having the above-described configuration is a pair of right and left symmetrical with respect to the pipe joint portion 7B and is configured as an integral structure. 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 where the flange 50 is located radially inside the inner surface of the joint body 3 and the claws 52 extend radially inward to the deep side. In the cap member 4, the small-diameter seal ring 82 is mounted in the cap-side small-diameter seal ring housing 435, and the large-diameter seal ring 80 is mounted in the cap-side large-diameter seal ring housing 420 through the inner diameter side portion thereof. In this way, in a state where the respective members are 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 portion 30 of the joint body 3, and the joint is assembled by screwing the male screw and the female screw. Thus, 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 communicate with each other, 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 screwing the male screw and the female screw, the cap member 4 is fastened to the joint body 3 by holding the cap large-diameter portion 42 with a tool and rotating the cap member 4. In this way, the outer diameter side portion of the large diameter seal ring 80 is received in the main body side large diameter seal ring receiving portion 320.

The large-diameter seal ring 80 is compressed by being sandwiched between the outer surface of the cap-side large-diameter seal ring housing portion 420 and the inner surface of the main-body-side large-diameter seal ring housing portion 320. 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 in the axial outer side with respect to the threaded portion of the male thread and the female thread.

The pair of lock rings 5 are arranged in parallel in the lock ring housing 310 so as to contact with each other in the axial direction of the joint body 3. Since the pair of lock rings 5 have the same structure, the description of the structure of the one-side lock ring 5 will be used as the description of the other-side 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 by bending from an end portion 500 of the flange 50 toward the center side of the flange 50; a plurality of claws 52 formed to be bent toward the axial direction of the joint main 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 claws 52.

The thickness of the locking ring 5 of the present embodiment is the same at any position. 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 a flat surface extending in the axial direction, for example. The flange inner surface 502 located radially inward of the flange 50 is a flat surface extending in the axial direction, for example. The flange outer surface 501 and the flange inner surface 502 are chamfered at the 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 claw holding deep-side surface 510 located on the deep side of the claw holding portion 51 is a plane extending in a direction perpendicular to the axial center direction, for example. The claw holding proximal surface 511 located on the proximal side of the claw holding portion 51 is a flat surface extending in a direction perpendicular to the axial center direction, for example. The claw holding deep side surface 510 and the claw holding near-front side surface 511 are chamfered at radially inner portions thereof.

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

The radially outer (proximally facing) jaw outer surface 521 of the jaw 52 is, for example, a flat surface. The radially inner (depth-side) claw inner surface 522 of the claw 52 is, for example, a flat surface.

The pair of lock rings 5 are accommodated in a space surrounded by the locking surface 341 of the joint body 3, the pressing surface 431 of the cap member 4, and the inner surface (for example, the body-side opposed surface 342) of the joint body 3, and the claws 52 are locked to the outer peripheral surface of the inserted pipe body 2A to restrict the removal of the pipe body 2A.

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

The pawl abutment ring 6 is received in the annular space 53 of the locking ring 5. The claw abutment ring 6 is accommodated in the annular space 53 in a state where displacement in the radial direction is allowed. The claw contact ring 6 of the present embodiment is made of metal.

The claw abutment ring 6 has a claw abutment surface 60, and the claw abutment surface 60 is disposed on the front side of the claws 52 of the depth side lock ring 5C, and when the claws 52 of the depth side lock ring 5C are deformed to the front side, the claw abutment surface 60 abuts against the claws 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 proximal lock ring 5D from the depth side.

The claw contact ring 6 of the present embodiment includes: a ring bottom surface 63 which is a radially inner surface of the claw abutment ring 6; the face radially outside the claw abutment ring 6 is the ring top face 64. The claw contact ring 6 has a connection surface 65 connecting the inner front end edge of the deformation support surface 62 and the near front end edge of the ring bottom surface 63.

The claw abutment surface 60 is, for example, a surface that abuts against a portion of the depth-side lock ring 5C other than the distal end portion 520 of the claw 52. The claw contact surface 60 is a surface located radially inward and on the depth side of the claw contact ring 6. The claw contact surface 60 of the present embodiment is disposed between the claws 52 of the depth side lock ring 5C and the claws 52 of the near side lock ring 5D. That is, the claws 52 of the depth side lock ring 5C, the claw abutment surfaces 60, and the claws 52 of the front side lock ring 5D are arranged in this order from the depth side toward the front side of the joint body 3.

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

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

The claw contact ring 6 of the present embodiment is arranged as follows: the distance between the inner distal edge 600 of the claw contact surface 60 and the axial center α of the joint body 3 is equal to the distance between the inner distal edge 343 of the locking surface 341 of the joint body 3 and the axial center α of the joint body 3. Further, the distance between the inner front end edge 600 of the claw contact surface 60 and the axial center α of the joint main body 3 is also equal to the distance between the inner front end edge 433 of the pressing surface 431 of the cap member 4 and the axial center α of the joint main body 3. Further, as the inner front end edge of the portion chamfered like the locking surface 341 or the pressing surface 431, an inner front end edge before chamfering (when it is assumed that chamfering is not performed) is used for the portion.

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

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

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

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 main body 3. A radially outer portion of the claw holding contact surface 61 is chamfered.

The deformation support surface 62 abuts the claw holding deep side surface 510 of the proximal lock ring 5D. The deformation support surface 62 is a surface located radially outward and forward of the claw contact ring 6. The deformation support surface 62 of the present embodiment is disposed between the claw holding portion 51 of the depth 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 depth-side lock ring 5C, the deformable support surface 62, and the claw holding portion 51 of the front-side lock ring 5D are arranged in this order from the depth side toward the front 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 contact surface 60 or the claw holding contact surface 61. The deformation support surface 62 is disposed in a state separated in the depth direction from the claw holding contact surface 61.

The radially outer portion of the deformation support surface 62 is chamfered. The distance (dimension) between the deformable support surface 62 and the claw holding abutment surface 61 in the axial direction of the joint body 3 may be set to a degree that allows the claw abutment ring 6 to be clamped by the pair of lock rings 5 while allowing the radial displacement movement. For example, in the axial direction of the joint body 3, the distance between the deformation support surface 62 and the claw holding abutment surface 61 coincides with the distance between the claw holding deep side surface 510 of the near side lock ring 5D and the claw holding near side surface 511 of the deep side lock ring 5C.

The ring bottom surface 63 extends from the inner front end edge of the claw contact surface 60 toward the front side. 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 front end portions 520 of the claws 52 of the lock ring 5.

As shown in fig. 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. Further, the distance between the ring bottom surface 63 of the claw contact ring 6 and the axis α of the joint body 3 coincides with the distance between the extension surface 352 of the joint body 3 and the axis α of the joint body 3 (see fig. 2).

The ring top surface 64 extends between an outer end edge of the claw holding abutment surface 61 and an outer end 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. Further, the ring top face 64 extends in parallel with the flange inner face 502 of the proximal lock ring 5D. The ring top surface 64 of the present embodiment is chamfered at a depth side portion and a front side portion.

The ring top face 64 extends juxtaposed with, for example, the flange inner face 502 of the proximal locking ring 5D. The ring top surface 64 is disposed radially inwardly apart from the flange inner surface 502 of the proximal lock ring 5D. The distance in the radial direction between the ring top surface 64 and the flange inner surface 502 of the present 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 pawl contact 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 a radially outer portion of the claw holding portion 51 of the depth side lock ring 5C and a radially outer portion of the claw 52 and the claw holding portion 51 of the front side lock ring 5D and the claw 52. The connection surface 65 is disposed in a state of being radially inwardly separated from the claw inner surface 522 of the proximal lock ring 5D.

In the above pipe joint 1, 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 near side acts on the claws 52 of the depth side lock ring 5C to deform the claws 52 toward the near side, the claws 52 come into contact with the claw contact surface 60. At this time, the claw abutment ring 6 is allowed to move in the radial direction in the annular space 53. 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 abuts against the pressing surface 431 to be restricted from moving to the near side. In the depth side lock ring 5C and the near side lock 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 claws 52 of the depth side lock ring 5C, and thus the axial center of the claw contact ring 6 is aligned with the axial center of the pipe body 2A. Thereby, the claws 52 provided on the depth-side lock ring 5C are uniformly contacted with the claw contact surfaces 60.

Further, as the pipe body 2A is further pulled out, 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 pipe body 2A, so that the pulling out of the pipe body 2A 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 main body, that is, a surface extending in a direction orthogonal to the pulling-out direction of the pipe body 2A. Therefore, even if the pipe body 2A is further pulled out and a force is applied to the claw contact surface 60, the claw contact 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 claw holding abutment surface 61 is located radially outward of the claw abutment surface 60 and in front of the claw holding portion 51 of the depth-side lock ring 5C. Thus, when the pulling-out force is generated in the pipe body 2A, the claw holding abutment surface 61 abuts against the claw holding portion 51 of the depth 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 abuts against the claw holding portion 51 of the near-side lock ring 5D from the depth side. Therefore, even if a pulling-out force is generated in the pipe body 2A and the claws 52 of the depth side lock ring 5C are deformed, and a 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 surface 60 and the claw holding contact surface 61 so as not to be displaced to the depth side in the claw contact ring 6.

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 locking 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 contact ring 6 is disposed apart from the axial center α of the joint body 3 to the same extent as the inner front end edge 343 of the locking surface 341 of the joint body 3. Therefore, when the pipe body 2A is inserted into the joint body 3, the claw abutment ring 6 can be prevented from interfering with the pipe body 2A, and when a pulling-out force acts on the pipe body 2A, the claws 52 of the depth side lock ring 5C can be brought into abutment with the claw abutment surfaces 60 to the maximum extent, and the claws 52 can be caused to bite 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 not have the claw holding abutment surface 61. Further, the claw abutment ring 6 may not have the deformation support surface 62.

The claw contact surface 60 of the above embodiment is a surface perpendicular to the axial direction of the joint body 3, but may be a surface inclined with respect to the axial direction. For example, the claw abutment surface 60 may also extend in the direction in which the claws 52 of the depth-side lock ring 5C extend. The embodiment having the claw contact ring 6 configured as described above 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 the annular space 53 in a state where the claw contact ring 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 depth-side lock ring 5C on the radially 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 proximal lock ring 5D from the depth 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 contact ring 6 has a proximal connection surface 65 connecting the inner distal end edge of the deformation support surface 62 and the proximal end edge of the ring bottom surface 63. The claw contact ring 6 has a depth side connection surface 66 that connects an inner front end edge of the claw contact surface 60 and a depth side end edge of the ring bottom surface 63.

The claw abutment surface 60 is a surface that abuts against a portion other than the distal end portion 520 of the claw 52 of the depth-side lock ring 5C, for example. Specifically, the claw abutment surface 60 faces a radially outer portion of the claw 52 of the depth-side lock ring 5C (e.g., a portion equal to or less than a radially outer half of the claw 52). The claw contact surface 60 is separated from a radially outer portion of the claw 52 of the depth side lock ring 5C.

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

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

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

Further, the claw abutment ring 6 of the present embodiment is arranged such that: the distance between the inner distal edge 600 of the claw contact surface 60 and the axial center α of the joint body 3 is greater than the distance between the inner distal edge 343 of the locking surface 341 of the joint body 3 and the axial center α of the joint body 3. Further, the distance between the inner front end edge 600 of the claw contact surface 60 and the axial center α of the joint main body 3 is larger than the distance between the inner front end edge 433 of the pressing surface 431 of the cap member 4 and the axial center α of the joint main body 3. Further, as the inner front end edge of the portion chamfered like the locking surface 341 or the pressing surface 431, the inner front end edge of the portion chamfered before (assuming that chamfering is not performed) is used.

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

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

The claw holding contact 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 main body 3. A radially outer portion of the claw holding contact surface 61 is chamfered.

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

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 contact surface 60 and the claw holding contact surface 61. The deformation support surface 62 is disposed in a state separated in the depth direction from the claw holding contact surface 61.

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 abutment surface 61 in the axial direction of the joint body 3 may be set to a degree that allows the claw abutment ring 6 to be sandwiched by the pair of lock rings 5 while allowing the radial misalignment movement, and may be, for example, equal to the distance between the claw holding deep side surface 510 of the near side lock ring 5D and the claw holding near front side surface 511 of the deep side lock ring 5C.

The ring bottom surface 63 extends from the inner front end edge of the claw contact surface 60 toward the front side. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. Further, the ring bottom surface 63 is located radially outward of the front end portions 520 of the claws 52 of the lock ring 5.

As shown in fig. 7, the ring bottom surface 63 is, for example, a ring-shaped 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. Further, the distance between the ring bottom surface 63 of the claw contact ring 6 and the axis α of the joint body 3 coincides with the distance between the extension surface 352 of the joint body 3 and the axis α of the joint body 3 (see fig. 6).

Also, the ring top surface 64 extends alongside, for example, the flange inner surface 502 of the proximal locking ring 5D. The ring top surface 64 is disposed in a state of being radially separated from the flange inner surface 502 of the proximal locking ring 5D. The distance in the radial direction between the ring top surface 64 and the flange inner surface 502 of the present embodiment is equal at any position in the axial direction of the joint body 3 except for the chamfered portion of the ring top surface 64.

The proximal connection surface 65 is disposed more proximal than the pawl contact surface 60. The proximal connection surface 65 may be a flat surface or a curved surface, but is, for example, a flat surface. The proximal connection surface 65 is disposed between a radially outer portion of the claw holding portion 51 of the depth lock ring 5C and a radially outer portion of the claw 52 and the claw 52 of the claw holding portion 51 of the proximal lock ring 5D. The proximal connection surface 65 is disposed in a state of being radially inwardly separated from the claw inner surface 522 of the proximal lock ring 5D.

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

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

The claw contact ring 6 of the present embodiment is disposed such that the distance between the inner front end edge 660 of the depth-side connection surface 66 and the axial center α of the joint body 3 coincides with the distance between the inner front end edge 343 of the locking surface 341 of the joint body 3 and the axial center α of the joint body 3. Further, the distance between the inner front end edge 660 of the depth side connection surface 66 and the axial center α of the connector body 3 coincides with the distance between the inner front end edge 433 of the pressing surface 431 of the cap member 4 and the axial center α of the connector body 3.

In the above pipe joint 1, 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 a pulling-out force acts on the pipe body 2A and the claws 52 of the depth side lock ring 5C are deformed to the front side, the claws 52 come into contact with the claw contact surface 60. At this time, since the deformation of the claws 52 of the depth-side lock ring 5C is restricted by the claw contact surfaces 60, the portions (for example, the distal end portions 520) of the claws 52 located radially inward of the claw contact surfaces 60 bite into the pipe body 2A sufficiently, and therefore, the removal of the pipe body 2A can be restricted sufficiently.

In the pipe joint 1 of the above embodiment, since the extended distal end portions of the claw contact surfaces 60 are separated from the radially inner distal end portions of the proximal side surfaces of the claws 52 of the deep side lock ring 5C by a predetermined distance to the radially outer side and the distal end portions 520 of the claws 52 of the deep side lock ring 5C are separated from the claw contact surfaces 60, when a pulling-out force is generated in the pipe body 2A, the distal end portions 530 of the claws 52 of the deep side lock ring 5C are reliably deformed and bite into the pipe body 2A, and thus the pulling-out of the pipe body 2A can be reliably restricted.

In the pipe joint 1 of the above embodiment, since the ring bottom surface 63 is flat, the ring bottom surface 63 does not damage the pipe body 2A even if the ring bottom surface 63 contacts the pipe body 2A. Further, since the ring bottom surface 63 is flat, the strength of the portion of the claw contact ring 6 on the ring bottom surface 63 side is ensured, and therefore, even if the pulling-out force is generated in the pipe body 2A and the claws 52 of the depth side lock ring 5C are deformed, the ring bottom surface 63 can support the claw contact surface 60 so as not to be displaced 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 where the radial misalignment movement is allowed, 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, for example, so as to extend alongside the flange inner surface 502 of the proximal lock ring 5D and to be in a state of abutting against the flange inner surface 502 of the proximal lock ring 5D.

The extended distal end portion 601 of the claw contact surface 60 of the above embodiment is disposed so as to be separated from the radially inner distal end portion of the claw outer surface 521 of the depth side lock ring 5C by a predetermined distance to the radially outer side. For example, the extended distal end 601 of the claw abutment surface 60 may abut against the radially inner distal end of the claw outer surface 521 of the depth-side lock ring 5C.

The ring bottom surface 63 of the claw contact ring 6 of 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 radially 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 body 3 by screw fastening, but may be assembled by another method such as fitting.

The pipe joint of the present invention is a pipe joint for connecting pipes, and includes: a tubular joint body having an opening portion into which the pipe body is inserted, the pipe body being inserted to a depth side through the opening portion, a tubular cap member assembled to the opening portion, a pair of lock rings including a depth side lock ring disposed on the depth side of the joint body and a near side lock ring disposed on a near side of the joint body, and a claw contact ring, each lock ring including: an annular flange centered on the axial direction of the joint body; an annular claw holding portion formed by bending from an end portion of the flange toward a center side of the flange; a plurality of claws formed by bending the claw holding portion to a depth side in the axial direction, wherein the claw contact rings are accommodated in the joint body in parallel in the axial direction in a state where the flange is positioned radially inward of an inner surface of the joint body and the claws extend to an inner diameter side to the depth side, wherein the claw contact rings are accommodated in an annular space surrounded by the flange of the front-side lock ring, the claw holding portion, and the claws, wherein the joint body has a locking surface which locks with the depth-side lock ring from the depth side, wherein the cap has a pressing surface which presses the front-side lock ring from the front side, wherein the pair of lock rings are accommodated in a space surrounded by the locking surface of the joint body, the pressing surface of the cap, and the inner surface of the joint body, and wherein the claws are locked to an outer peripheral surface of the inserted pipe body to restrict the pull-out of the pipe body, the claw abutting ring is disposed on a proximal side of the claw of the depth side lock ring and has a claw abutting surface that abuts the claw from the proximal side when the claw of the depth side lock ring is deformed to the proximal side, the claw of the depth side lock ring extends radially inward from the claw abutting surface, and the claw abutting ring is housed in the annular space in a state where a radially displaced movement is permitted.

According to this configuration, since the claw abutting surface is provided on the claw abutting ring, even if the pulling-out force acts on the pipe body and the claw of the depth-side lock ring is deformed to the front side, the claw abuts against the claw abutting surface. At this time, since the claw contact ring is displaced in the radial direction in the annular space, the claw contact ring is centered by contact with the claws of the depth side lock ring, and thus the axial center of the claw contact ring is aligned with the axial center of the inserted pipe body. Therefore, the pawls provided on the depth-side lock ring are uniformly in contact with the pawl contact surfaces, respectively. Further, when the pipe body is further pulled out, the portions of the claws of the depth-side lock ring located radially inward of the claw abutment surfaces bite into the pipe body in a state where the claws are along the claw abutment surfaces of the claw abutment 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 expands in the direction orthogonal to the extraction direction of the pipe body, even if a force acts on the claw contact surface as the extraction of the pipe body progresses, the claw contact surface can effectively support the claws of the depth side lock ring.

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

According to this configuration, when the pulling-out force is generated in the pipe body, the claw holding abutment surface abuts against the claw holding portion of the depth-side lock ring from the front side, so that the deformation of the claw holding portion can be reliably restricted.

In the pipe joint, the claw abutment ring may have a deformation support surface which abuts against the claw holding portion of the front-side lock ring from a depth side.

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

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 clamping surface and the axis of the joint main body.

According to this configuration, the inner front end edge of the claw contact ring is disposed apart from the axial center of the joint body to the same extent as the inner front end edge of the pressing surface of the cap member. Therefore, when the pipe body is inserted into the joint body, the claw contact ring can be prevented from interfering with the pipe body. Further, when a pulling-out force is generated in the pipe body, the claws of the depth-side lock ring can be brought into contact with the claw contact surfaces to the maximum extent, and the claws bite into the pipe body.

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

The pipe joint of the present invention is a pipe joint for connecting pipes, and includes: a tubular joint body having an opening portion into which the pipe body is inserted, the pipe body being inserted to a depth side through the opening portion, a tubular cap member assembled to the opening portion, a pair of lock rings including a depth side lock ring disposed on the depth side of the joint body and a near side lock ring disposed on a near side of the joint body, and a claw contact ring, each lock ring including: an annular flange centered on the axial direction of the joint body; an annular claw holding portion formed by bending from an end portion of the flange toward a center side of the flange; a plurality of claws formed by bending the claw holding portion to a depth side in the axial direction, wherein the locking rings are accommodated in the joint body side by side in the axial direction in a state where the flange is positioned radially inside an inner surface of the joint body and the claws extend to an inner diameter side to a depth side, the claw contact ring is accommodated in an annular space surrounded by the flange of the front side lock ring, the claw holding portion, and the claws, the cap member has a pressing surface that presses the front side lock ring from the front side, the pair of lock rings are configured to restrict the removal of the pipe body by locking the claws to an outer peripheral surface of the inserted pipe body, the claw contact ring is disposed on the front side of the claws of the depth side lock ring and has claw contact surfaces that come into contact with the claws from the front side when the claws of the depth side lock ring are deformed to the front side, the pawls of the depth-side lock ring extend radially inward than the pawl abutment surfaces, and the pawl abutment surfaces extend in a direction in which the pawls of the depth-side lock ring extend.

According to this configuration, since the claw contact surface is provided on the claw contact ring, even if a pulling-out force acts on the pipe body and the claws of the depth-side lock ring are deformed to the front side, the claws are brought into contact with the claw contact surface. At this time, since the deformation of the claws of the depth 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 removal of the pipe body can be restricted sufficiently.

According to this configuration, since the radially inner distal end portions of the claws of the depth side lock ring are separated from the claw abutment surfaces, when the pulling-out force is generated in the pipe body, the distal end 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 radially inward of the claw contact surface, and the ring bottom surface is located radially outward of the distal end portions of the claws of the deep-side lock ring.

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

The pipe joint of the present invention is a pipe joint for connecting pipes, and includes: a cylindrical joint body provided with an opening portion into which the pipe body is inserted, the pipe body being inserted to a deep side through the opening portion, a cylindrical cap member assembled to the opening portion, and a pair of lock rings each having: an annular flange centered on the axial direction of the joint body; an annular claw holding portion formed by bending from an end portion of the flange toward a center side of the flange; a plurality of claws formed by bending in the axial direction on the inner surface side of the claw holding portion, each of the lock rings being accommodated in the joint body in parallel in the axial direction in a state where the flange is positioned radially inside the inner surface of the joint body and the claw extends to the inner diameter side in the depth direction, the pair of lock rings including a depth side lock ring disposed on the depth side of the joint body and a front side lock ring disposed on the front side of the joint body, the cap member having a pressing surface pressing the front side lock ring from the front side, the pair of lock rings being 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 pipe joint of the present invention further having a claw abutting ring accommodated in an annular space surrounded by the flange of the front side lock ring, the claw holding portion, and the claw, the claw abutting ring is disposed on a proximal side of the claw of the depth side lock ring and has a claw abutting surface that abuts the claw from the proximal side when the claw of the depth side lock ring is deformed to the proximal side, the claw of the depth side lock ring extends radially inward from the claw abutting surface, and the claw abutting surface extends in a direction in which the claw of the depth side lock ring extends.

Description of the reference numerals

1 … pipe joint, 2A, 2B … pipe body, 3 … joint body, 4 … hat part, 5 … lock ring, 5C … deep side lock ring, 5D … near front side lock ring, 6 … claw abutment ring, 7A, 7B … pipe joint part, 8 … seal ring, 20a … deepest end face, 30 … opening part, 31 … body side insertion space, 32 … body large diameter part, 33 … body small diameter part, 34 … first body small diameter part, 35 … second body small diameter part, 40 … side insertion space, 41 … reduced part, 42 … cap large diameter part, 43 … cap small diameter part, 50 … flange, 51 … claw retaining part, 52 … claw, 53 … annular space, 60 … claw abutment face, 61 … claw retaining face, 62 … deformation support face, 3663 ring bottom face, … ring, 64 … ring top face, near front side … connecting face (… connecting face), … face … connecting face … face, 81 … auxiliary seal ring, 82 … minor diameter seal ring, 101 … pipe joint, 103 … joint body, 104 … cap piece, 105 … lock ring, 150 … flange, 151 … claw holding portion, 152 … claw, 310 … lock ring receiving portion, 320 … main body side major diameter seal ring receiving portion, 321 … main body side first abutment surface, 340 … main body side second abutment surface, 341 … engagement surface, 342 … main body side opposed surface, 343 … inner side front end edge, 350 … step surface, … step wall, 352 … extension surface, 410 … auxiliary seal ring receiving portion, 420 … cap side major diameter seal ring receiving portion, 421 … cap side first abutment surface, 430 … minor diameter portion depth side end surface, 431 … pushing surface, 432 … cap side second abutment surface, … inner side front end edge, 434 cap 72 guide surface, … side seal ring 435, 500 … end receiving portion, … end portion, 36501 outer surface, …, 36510 longitudinal depth side flange, 36510 side inner surface of … holding portion, the 511 … jaw holds the proximal face, 520 … tip, 521 … jaw outer face, 522 … jaw inner face, 600 … inner front end edge, 601 … extension tip, 660 … inner front end edge, α … axle center, C … imaginary circle.

Claims

1. A pipe joint for connecting pipe bodies, comprising:

a tubular joint body having an opening into which the pipe body is inserted, the pipe body being inserted to a depth side through the opening;

a cylindrical cap member attached to the opening;

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

a claw abutting ring housed in an annular space surrounded by the flange of the proximal lock ring, the claw holding portion, and the claws,

the joint body has an engagement surface that engages with the depth-side lock ring from the depth side,

the cap member has a pressing surface that presses the proximal lock ring from the proximal side,

the pair of lock 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 are configured to be locked to the outer circumferential surface of the inserted pipe body by the claws to restrict the pipe body from being pulled out,

the claw abutting ring is arranged on the front side of the claw of the depth side locking ring and has a claw abutting surface which abuts against the claw from the front side when the claw of the depth side locking ring deforms to the front side,

the pawls of the depth-side lock ring extend radially inward than the pawl abutment surfaces,

the claw abutment ring is housed in the annular space in a state where a radially displaced movement is allowed.

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

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

4. The pipe joint according to any one of claims 1 to 3, the claw abutment ring having a deformation bearing surface which abuts with a claw holding portion of the proximal side lock ring from a depth side.

5. The pipe joint according to any one of claims 1 to 4, the pawl 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 clamping surface and the axis of the joint main body.

6. A pipe joint for connecting pipe bodies, comprising:

a cylindrical cap member attached to the opening;

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

the pair of lock rings are configured to restrict the removal of the pipe body by the claws being locked to the outer peripheral surface of the inserted pipe body,

the pawl abutment surface extends in a direction in which the pawl of the depth-side lock ring extends.

7. The pipe joint according to claim 6, wherein the extended front end portions of the claw abutment surfaces are arranged to be separated from radially inner front end portions of the proximal side surfaces of the claws of the depth-side lock ring by a predetermined distance radially outward.

8. The pipe joint according to claim 6 or 7, the claw abutment ring having a planar or curved ring bottom surface on a radially inner side than the claw abutment surface,

the ring bottom surface and the front end portions of the claws of the depth side lock ring are located radially outward.