WO2021100291A1

WO2021100291A1 - Pipe joint

Info

Publication number: WO2021100291A1
Application number: PCT/JP2020/034619
Authority: WO
Inventors: 寺田　孝
Original assignee: 株式会社タブチ
Priority date: 2019-11-19
Filing date: 2020-09-14
Publication date: 2021-05-27
Also published as: CN113167415A

Abstract

The present invention comprises: a joint body; a cap member; a back-side lock ring disposed on the back side of the joint body, and a front-side lock ring located on the front side of the joint body; and a tine-abutment ring. The lock rings are housed 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 are configured so that the lock-ring tines lock against the outer-peripheral surface of a pipe piece pressed thereinto, restricting the pipe piece from being pulled out. The tine-abutment ring is disposed on the front side of the tines in the back-side lock ring, and has a tine-abutment surface that with the tines on the back-side lock ring having been deformed toward the front, abuts on the tines from the front side. The tines on the back-side lock ring extend radially inward of the tine-abutment surface. The tine-abutment ring is housed in a state permitting slipping movement radially within the annular space.

Description

Pipe fitting

Cross-reference of related applications

This application claims the priority of Japanese Patent Application No. 2019-208806 and Japanese Patent Application No. 2019-208811 and is incorporated in the description of the present application by citation.

The present invention relates to a pipe joint, and more particularly to a pipe joint provided with a lock ring that regulates the pulling out of the inserted pipe body.

As this type of pipe joint, the technique described in Patent Document 1 below has been proposed. As shown in FIG. 8, the pipe joint 101 has a joint body 103 having a stepped surface in the inner inner part that comes into contact with the innermost end of the pipe body, and a cylinder that is screwed to the opening of the joint body 103. The shape of the cap member 104 and the lock ring 105 housed in the lock ring accommodating portion of the joint body 103 are provided. In the pipe joint 101, the

pipe bodies

2A and 2B are inserted in a state where the joint body 103 and the cap member 104 are assembled.

As shown in FIGS. 9A and 9B, the lock ring 105 includes an annular flange 150 along the axial direction, an annular claw holding portion 151 formed by bending the flange 150 from the end to the center side, and the like. A plurality of claws 152 formed by bending on the inner surface side of the claw holding portion 151 are provided. Further, two lock rings 105 are arranged side by side on the back side and the front side of the joint body 103 in a state where the flange 150 hits the inner surface of the lock ring accommodating portion and the claw 152 extends toward the back side toward the inner diameter side. It is narrowly held by the locking surface of the lock ring accommodating portion and the pressing surface of the cap member 104 (see FIG. 8). When a pulling force acts on the

pipe bodies

2A and 2B inserted into the pipe joint 101, the claw 152 of the lock ring 105 bites into the outer surface of the

pipe bodies

2A and 2B, so that the

pipe bodies

2A and 2B from the pipe joint 101 Withdrawal is regulated.

Japanese Patent Application Laid-Open No. 2019-90503

However, the flange of the lock ring located on the back side is fixed by being sandwiched between the flange of the lock ring on the front side and the locking surface of the lock ring accommodating portion. Therefore, when the pulling force acts on the tube body, not only the claw in the lock ring but also the claw holding portion itself is deformed. As a result, the nails may not bite into the tube body sufficiently, and the regulation of pulling out the tube body may be insufficient.

Therefore, an object of the present invention is to provide a pipe joint capable of sufficiently restricting the pulling out of the pipe body.

The pipe joint of the present invention is a pipe joint for connecting a pipe body, and is provided with an opening into which the pipe body is inserted, and the pipe body is inserted into the inner side through the opening. Includes a joint body, a tubular cap member assembled to the opening, a back lock ring arranged on the back side of the joint body, and a front lock ring arranged on the front side of the joint body. A pair of lock rings, each of which is an annular flange centered on the axial direction of the joint body and an annular shape formed by bending from the end of the flange toward the center of the flange. It has a claw holding portion and a plurality of claws formed by bending from the claw holding portion to the back side in the axial direction, and the flange is located inside the inner surface of the joint body. A pair of lock rings that are housed in the joint body side by side in the axial direction with the claws extending toward the inner diameter side, and a flange, a claw holding portion, and a claw of the front side lock ring. The joint body includes a claw contact ring housed in an enclosed annular space, the joint body has a locking surface that locks from the back side to the back side lock ring, and the cap member has a locking surface. The pair of lock rings have a holding surface that presses the front side lock ring from the front side, and the pair of lock rings is a space surrounded by the locking surface of the joint body, the holding surface of the cap member, and the inner surface of the joint body. The claw is locked to the outer peripheral surface of the pipe body which is housed inside and inserted to restrict the pulling out of the pipe body, and the claw contact ring is the back side lock ring. The claw of the back side lock ring is arranged on the front side of the claw and has a claw contact surface that comes into contact with the claw from the front side when the claw of the back side lock ring is deformed to the front side. The claw contact ring extends inward in diameter from the claw contact surface, and the claw contact ring is housed in a state in which displacement movement in the radial direction is permitted in the annular space.

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

Further, in the pipe joint, the claw contact ring may be provided with a claw holding contact surface located outside the diameter of the claw contact surface and on the front side of the claw holding portion of the back lock ring. Good.

Further, in the pipe joint, the claw contact ring may be provided with a deformed support surface that contacts the claw holding portion of the front side lock ring from the back side.

Further, in the pipe joint, the distance between the inner tip edge of the claw contact surface and the axial center of the joint body is the distance between the inner tip edge of the locking surface and the joint body. It may be arranged so as to match the distance from the axis.

The pipe joint of the present invention is a pipe joint for connecting a pipe body, and is provided with an opening into which the pipe body is inserted, and the pipe body is inserted into the inner side through the opening. Includes a joint body, a tubular cap member assembled to the opening, a back lock ring arranged on the back side of the joint body, and a front lock ring arranged on the front side of the joint body. A pair of lock rings, each of which is an annular flange centered on the axial direction of the joint body and an annular shape formed by bending from the end of the flange toward the center of the flange. It has a claw holding portion and a plurality of claws formed by bending from the claw holding portion to the back side in the axial direction, and the flange is located inside the inner surface of the joint body. A pair of lock rings that are housed in the joint body side by side in the axial direction with the claws extending toward the inner diameter side, and a flange, a claw holding portion, and a claw of the front side lock ring. The cap member includes a claw contact ring housed in an enclosed annular space, the cap member has a pressing surface for pressing the front side lock ring from the front side, and the pair of lock rings are inserted. The claw is locked to the outer peripheral surface of the tubular body to restrict the withdrawal of the tubular body, and the claw contact ring is arranged on the front side of the claw of the rear lock ring. When the claw of the back side lock ring is deformed to the front side, the claw of the back side lock ring has a claw contact surface that comes into contact with the claw from the front side, and the claw of the back side lock ring is inside the diameter of the claw contact surface. The claw contact surface extends along the direction in which the claw of the back lock ring extends.

Further, in the pipe joint, the extending tip portion of the claw contact surface is arranged so as to be separated from the inner tip portion of the inner diameter of the front side surface of the claw of the inner lock ring by a predetermined distance.

Further, in the pipe joint, the claw contact ring has a flat or curved ring bottom surface inside the diameter of the claw contact surface, and the ring bottom surface is the tip end portion of the claw of the back side lock ring. It is located outside the diameter.

FIG. 1 is a partially broken side view of the pipe joint according to the present embodiment. FIG. 2 is an enlarged view of the region shown by II in FIG. FIG. 3A is a side view of a single lock ring of the pipe joint. FIG. 3B is a front view of a single lock ring of the pipe joint. FIG. 4 is a partial cross-sectional perspective view of the claw contact ring of the pipe joint. FIG. 5 is a partially broken side view of the pipe joint according to the modified example. FIG. 6 is an enlarged view of the region shown by VI in FIG. FIG. 7 is a partial cross-sectional perspective view of the claw contact ring of the pipe joint. FIG. 8 is a partially broken side view of a conventional pipe joint. FIG. 9A is a side view of a single lock ring of the pipe joint. FIG. 9B is a front view of a single lock ring of the pipe joint.

Hereinafter, the pipe joint according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. The pipe joint 1 according to the present embodiment is suitably used for connecting medical gas copper pipes, refrigerant gas copper pipes, and the like, which are examples of pipe bodies. The pressure when flowing medical gas, refrigerant (including both gas and liquid) and the like through the pipe body is generally higher than the water pressure when tap water is flown through the pipe body.

As shown in FIG. 1, the pipe joint 1 is a pipe joint that connects the

pipe bodies

2A and 2B. Further, 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. In order to connect the

pipe bodies

2A and 2B to be connected to each other, the pipe joint 1 has pipe

joint portions

7A and 7B having a symmetrical structure at the central position along the axial direction (longitudinal direction) of the

pipe bodies

2A and 2B. , It is configured as a pair and as a unit. Therefore, in the following description, the description of the pipe joint portion 7A on one side with respect to the center position also serves as the description of the configuration on the other side.

Since the joint body 3 has a pipe joint portion 7A on one side and a pipe joint portion 7B on the other side, the joint body 3 has a symmetrical structure and is integrally configured. In the following description, even if the joint body 3 has a symmetrical structure and is integrated, the joint body 3 in the description of the pipe joint portion 7A on one side is the area occupied by the pipe joint portion 7A on one side of the joint body 3. Represents. It is assumed that the reference numerals attached to each part of the pipe joint portion 7A are also attached to the same parts of the pipe joint portion 7B. Further, it is assumed that the reference numerals attached to each part of the pipe joint portion 7B are also attached to the same parts of the pipe joint portion 7A.

Hereinafter, the configuration of the pipe joint portion 7A on one side will be described. As shown in FIG. 2, the pipe joint portion 7A includes a joint body 3, a cap member 4, a pair of lock rings 5, and a claw contact ring 6. In the pipe joint portion 7A, the pair of lock rings 5 are arranged side by side with the back side lock ring 5C arranged on the back side of the joint body 3 and the back side lock ring 5C on the front side of the joint body 3. Includes ring 5D and. Further, 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 is a tubular portion into which the pipe body 2A is inserted into the back side through the opening 30. The joint main body 3 of the present embodiment is formed in a tubular shape having a main body side insertion space 31 inside. The joint body 3 is a large-diameter portion 32 of the main body, which is a portion on the front side (right side in FIG. 1) where the pipe body 2A is inserted, and a portion on the back side (left side in FIG. 1) where the pipe body 2A is inserted. The main body small diameter portion 33 is integrally provided. The front side is the central side in the stretching direction of the joint body 3. The back side is the edge side of the joint body 3 in the extending direction. The front side is the side closer to the opening 30 of the joint body 3, and the back side is the side far from the opening 30 of the joint body 3.

The joint body 3 is made of metal or resin. Further, the joint body 3 may be made of a combination of metal and resin. That is, the joint body 3 may be a composite pipe 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 located on the inner side of the cap member 4 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 so as to communicate with the back side of the opening 30. The inner end of the main body side insertion space 31 has a reduced diameter. Further, the main body side insertion space 31 has a lock ring accommodating portion 310 at an end portion (front end portion) on the opening 30 side.

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

The main body large diameter portion 32 is formed to have a larger diameter than the main body small diameter portion 33. The main body large diameter portion 32 of the present embodiment has a tubular shape having the same outer diameter at any portion in the axial direction (depth direction, left-right direction in FIG. 1) of the joint main body 3. A female screw is formed on a part of the inner surface of the large diameter portion 32 of the main body. An annular main body-side large-diameter seal accommodating portion 320 for accommodating the seal ring 8 (for example, the large-diameter seal ring 80) is formed on the inner surface of the main body large-diameter portion 32 on the front side. Further, the main body large diameter portion 32 has a main body side first contact surface 321 that comes into contact with the cap member 4. The main body side first contact surface 321 is an end surface on the front side of the main body large diameter portion 32.

The main body small diameter portion 33 is formed to have a smaller diameter than the main body large diameter portion 32. The main body small diameter portion 33 of the present embodiment is a first main body small diameter portion 34 located on the front side and adjacent to the main body large diameter portion 32, and a second main body located on the back side and adjacent to the first main body small diameter portion 34. The small diameter portion 35 and the like are included.

The small diameter portion 34 of the first main body of the present embodiment has a tapered tubular shape in which the outer diameter becomes smaller toward the portion located on the back side. The first main body small diameter portion 34 has a main body side second contact surface 340 that comes into contact with the cap member 4. Further, the first main body small diameter portion 34 has a locking surface 341 that locks from the back side to the back side lock ring 5C. Further, the first main body small diameter portion 34 is located outside the diameter of the back side lock ring 5C and the front side lock ring 5D, and has a main body side facing surface 342 facing the back side lock ring 5C and the front side lock ring 5D. Have. The small diameter portion 34 of the first main body of the present embodiment has a tubular shape having the same outer diameter at any portion in the axial direction of the joint main body 3.

In the first main body small diameter portion 34 of the present embodiment, the locking surface 341 and the main body side facing surface 342 define the lock ring accommodating portion 310. The second contact surface 340 on the main body side is, for example, a surface perpendicular to the axial direction of the joint main body 3. The locking surface 341 is, for example, a surface perpendicular to the axial direction of the joint body 3. The portion inside the diameter of the locking surface 341 is chamfered.

The main body side facing surface 342 extends toward the front side from the outer diameter outer edge of the locking surface 341. Further, the main body side facing surface 342 extends to the inner side from the innermost tip edge of the main body side second contact surface 340. Further, the main body side facing surface 342 is, for example, a surface extending in the axial direction of the joint main body 3.

The second main body small diameter portion 35 has an annular stepped surface 350 that comes into contact with the innermost end surface 20A of the pipe body 2A to be inserted. Further, the second main body small diameter portion 35 has a stepped wall 351 formed so as to be reduced in diameter at the central position in the axial direction of the joint main body 3. Further, the second main body small diameter portion 35 has an extending surface 352 extending toward the front side from the stepped surface 350.

The stepped surface 350 of this embodiment is a surface perpendicular to the axial direction of the joint body 3. Further, the stepped surface 350 is composed of a side surface of the stepped wall 351.

The extending surface 352 is a surface inclined with respect to the stepped surface 350. Further, the extending surface 352 extends inward from the inner edge of the locking surface 341 on the inner diameter. The extending surface 352 of the present embodiment extends in the axial direction of the joint body 3. Further, the extending surface 352 is arranged so as to be located on the outer diameter side of the outer peripheral surface of the pipe body 2A.

The cap member 4 is a tubular member that is 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 screwing. The cap member 4 is made of metal, for example. The cap member 4 is formed in a tubular shape with the inside as the cap side insertion space 40. The cap-side insertion space 40 communicates with the main body-side insertion space 31 in a state where the cap member 4 is assembled to the joint main body 3.

The cap member 4 of the present embodiment has a reduction portion 41 which is an end portion on the front side, a cap large diameter portion 42 integrally formed with the reduction reduction portion 41 on the back side of the reduction reduction portion 41, and a cap large diameter portion 42. It has a cap small diameter portion 43 formed integrally with the cap large diameter portion 42 on the back side of the cap. 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 shrinking portion 41 is formed in a conical shape by being reduced toward the front side. An auxiliary seal accommodating portion 410 for accommodating the seal ring 8 (for example, the auxiliary seal ring 81) is formed on the inner surface of the shrinkage reduction portion 41. The auxiliary seal ring 81 comes into contact with the outer peripheral surface of the pipe body 2A, and assists, for example, to prevent dew condensation generated on the outer peripheral surface of the pipe joint 1 from entering the inside of the pipe joint 1 in the pipe body 2A. ..

The cap large diameter portion 42 is a portion that is gripped by a tool. The cap member 4 is screwed to the joint body 3 by gripping the cap large diameter portion 42 with a tool and rotating the cap member 4. The cap large diameter portion 42 has a cap side first contact surface 421 that comes into contact with the main body side first contact surface 321 of the main body large diameter portion 32.

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

The cap small diameter portion 43 is formed to have a smaller diameter than the cap large diameter portion 42. Further, the cap small diameter portion 43 is integrally formed with the cap large diameter portion 42 via the cap side first contact surface 421.

Further, the cap small diameter portion 43 has a small diameter portion back end surface 430 which is an end surface on the back side. The rear end surface 430 of the small diameter portion is an annular surface. Further, the end surface 430 on the back side of the small diameter portion is set to have a longer length in the radial direction than the second contact surface 340 on the main body side. Further, the rear end surface 430 of the small diameter portion is a surface substantially perpendicular to the axial direction of the joint body 3.

Specifically, the small diameter portion back end surface 430 has a pressing surface 431 that presses the front side lock ring 5D from the front side. Further, the inner end surface 430 on the back side of the small diameter portion has a second contact surface 432 on the cap side that comes into contact with the second contact surface 340 on the main body side of the joint body 3. On the back end surface 430 of the small diameter portion, an annular recess (reference numeral omitted) is formed between the pressing surface 431 and the cap side second contact surface 432.

The pressing surface 431 is arranged at a distance from the locking surface 341 of the joint body 3 in the axial direction of the joint body 3. The pressing surface 431 of the present embodiment is a surface parallel to the locking surface 341. Further, the pressing surface 431 is, for example, a surface perpendicular to the axial direction of the joint body 3. Further, the pressing surface 431 comes into contact with the front side lock ring 5D in a state where a pulling force acts on the pipe body 2A. The portion inside the diameter of the pressing surface 431 and the portion outside the diameter of the pressing surface 431 of the present embodiment are chamfered. Further, in the radial direction, the inner tip edge 433 of the pressing surface 431 is arranged at the same position as the inner tip edge 343 of the locking surface 341.

The cap side second contact surface 432 is processed into a smooth surface, for example. Further, the cap-side second contact surface 432 is arranged on the stepped surface 350 side and inside with respect to the male screw of the main body large diameter portion 32 of the joint body 3.

The cap small diameter portion 43 of the present embodiment has a guide surface 434 extending toward the front side from the inner tip edge 433 of the pressing surface 431. The guide surface 434 extends in the axial direction of the joint body 3, for example. Further, the guide surface 434 is arranged so as to be located on the outer diameter side of the outer peripheral surface of the pipe body 2A.

A cap-side large-diameter seal accommodating portion 420 for accommodating the large-diameter seal ring 80 on the inner-diameter side portion is formed at a portion on the front side of the outer surface of the cap small-diameter portion 43 of the present embodiment. On the outer surface of the cap small-diameter portion 43, a male screw screwed into the female screw of the main body large-diameter portion 32 of the joint main body 3 is formed on a portion deeper than the cap-side large-diameter seal accommodating portion 420.

An annular cap-side small-diameter seal 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 accommodating portion 435 is arranged 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 configuration is configured as a pair and an integral structure symmetrically with respect to the pipe joint portion 7B. In the pipe joint 1, the pair of lock rings 5 are arranged in the axial direction of the joint body 3 in a state where the flange 50 is located inside the diameter of the inner surface of the joint body 3 and the claw 52 extends toward the inner diameter side. They are housed side by side in the joint body 3. In the cap member 4, the small diameter seal ring 82 is attached to the cap side small diameter seal accommodating portion 435, and the large diameter seal ring 80 is attached to the cap side large diameter seal accommodating portion 420 at the inner diameter side portion thereof. In this way, with each member attached to the joint body 3 and the cap member 4, the cap small diameter portion 43 of the cap member 4 is inserted into the opening 30 of the joint body 3 and assembled by screwing the male screw and the female screw. wear. As a result, the joint main body 3 and the cap member 4 are integrated, and the main body side insertion space 31 and the cap side insertion space 40 communicate with each other to form an insertion space for the pipe body 2A.

When assembling the cap member 4 to the opening 30 of the joint body 3 by screwing a male screw and a female screw, the large diameter portion 42 of the cap is gripped by a tool, and the cap member 4 is rotated to rotate the cap member 4. Tighten the cap member 4 to 3. Then, the outer diameter side portion of the large diameter seal ring 80 is accommodated in the main body side large diameter seal accommodating portion 320.

Further, the large-diameter seal ring 80 is sandwiched and compressed between the outer surface of the cap-side large-diameter seal accommodating portion 420 and the inner surface of the main body-side large-diameter seal accommodating portion 320. As a result, 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 outward 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 side by side with the lock ring accommodating portion 310 so as to come into contact with each other in the axial direction of the joint body 3. Since the pair of lock rings 5 have the same configuration, the description of the configuration of one lock ring 5 is also used as the description 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 and an annular shape formed by bending the end portion 500 of the flange 50 toward the center side of the flange 50. The claw holding portion 51 is provided, and a plurality of claws 52 formed by bending the joint body 3 in the axial direction on the inner surface side of the claw holding portion 51. Further, the lock ring 5 is provided with a flange 50, a claw holding portion 51, and an annular space 53 surrounded by the claws 52.

The thickness of the lock ring 5 of this embodiment is the same at any part. Further, the lock ring 5 of the present embodiment is made of metal.

The flange 50 of this embodiment extends in the axial direction of the joint body 3. The flange outer surface 501 located outside the diameter of the flange 50 is, for example, a plane extending in the axial direction. The flange inner surface 502 located inside the diameter of the flange 50 is, for example, a plane extending in the axial direction. Both the flange outer surface 501 and the flange inner surface 502 are chamfered on the front side.

The claw holding portion 51 of the present embodiment extends in a direction perpendicular to the axial direction of the joint body 3. The claw holding back side surface 510 located on the back side of the claw holding portion 51 is, for example, a flat surface extending in a direction perpendicular to the axial direction. The claw holding front side surface 511 located on the front side of the claw holding portion 51 is, for example, a flat surface extending in a direction perpendicular to the axial direction. The inner diameter of the claw holding back side surface 510 and the claw holding front side surface 511 are both chamfered.

In the lock ring 5 of the present embodiment, the claws 52 are arranged on the inner peripheral surface of the claw holding portion 51 at equal intervals in the circumferential direction. Further, each claw 52 is bent so as to be inclined toward the insertion direction (back side) of the tube body 2A. The claw 52 is formed by bending from the claw holding portion 51 toward the back side of the joint body 3 in the axial direction. As shown in FIG. 3, the outer diameter line of the claw 52 is formed in an arc shape. As shown in FIG. 3B, the virtual circle C connecting the tip portions 520 of the claw 52 has a diameter slightly smaller than the outer diameter of the tubular body 2A. That is, the tip portion 520 of the claw 52 is located inside the diameter of the extending surface 352 and the guide surface 434 (see FIG. 2).

The claw outer surface 521 located outside the diameter of the claw 52 (located on the front side) is, for example, a flat surface. The claw inner surface 522 located inside the diameter of the claw 52 (located on the back side) is, for example, a flat surface.

The pair of lock rings 5 are housed in a space surrounded by the locking surface 341 of the joint body 3, the holding surface 431 of the cap member 4, and the inner surface of the joint body 3 (for example, the main body side facing surface 342). Moreover, the claw 52 is locked on the outer peripheral surface of the inserted pipe body 2A to restrict the withdrawal of the pipe body 2A.

Further, in the pair of lock rings 5, when a pulling force acts on the pipe body 2A, the front side lock ring 5D comes into contact with the holding surface 431 of the cap member 4, so that the movement to the front side is restricted.

The claw contact ring 6 is housed in the annular space 53 of the lock ring 5. Further, the claw contact ring 6 is housed in the annular space 53 in a state where the displacement movement in the radial direction is allowed. The claw contact ring 6 of the present embodiment is made of metal.

Further, the claw contact ring 6 is arranged on the front side of the claw 52 of the back lock ring 5C, and when the claw 52 of the back lock ring 5C is deformed to the front side, the claw contact ring 6 comes into contact with the claw 52 from the front side. It has a claw contact surface 60. The claw contact ring 6 of the present embodiment includes a claw holding contact surface 61 located outside the diameter of the claw contact surface 60 and located on the front side of the claw holding portion 51 of the back lock ring 5C. Further, the claw contact ring 6 includes a deformed support surface 62 that contacts the claw holding portion 51 of the front side lock ring 5D from the back side.

The claw contact ring 6 of the present embodiment includes a ring bottom surface 63, which is a surface located inside the diameter of the claw contact ring 6, and a ring top surface 64, which is a surface located outside the diameter of the claw contact ring 6. Has. Further, the claw contact ring 6 has a connecting surface 65 that connects the inner tip edge of the deformed support surface 62 and the front end edge of the ring bottom surface 63.

The claw contact surface 60 is, for example, a surface of the claw 52 of the back lock ring 5C that abuts on a portion other than the tip portion 520. The claw contact surface 60 is a surface located inside and behind the diameter of the claw contact ring 6. The claw contact surface 60 of the present embodiment is arranged between the claw 52 of the back lock ring 5C and the claw 52 of the front lock ring 5D. That is, the claw 52 of the back lock ring 5C, the claw contact surface 60, and the claw 52 of the front lock ring 5D are arranged in this order from the back side to the front side of the joint body 3.

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

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

Further, in the claw contact ring 6 of the present embodiment, 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 the inner tip edge of the locking surface 341 of the joint body 3. It is arranged so as to match the distance between the 343 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 between the inner tip edge 433 of the holding surface 431 of the cap member 4 and the axial center α of the joint body 3. It also matches the distance of. As the inner tip edge of the chamfered part such as the locking surface 341 and the holding surface 431, the inner tip edge before the chamfering of this part is performed (assuming that the chamfering is not performed). Is used.

In this claw contact ring 6, the claw 52 of the back lock ring 5C extends inward in diameter from the claw contact surface 60. Further, the claw 52 of the front side lock ring 5D of the present embodiment extends inward in diameter from the claw contact surface 60.

The claw holding contact surface 61 is, for example, a surface that contacts the claw holding portion 51 of the back lock ring 5C. Specifically, the claw holding contact surface 61 abuts on the claw holding front side surface 511 of the back side lock ring 5C. The claw holding contact surface 61 is a surface located on the outer diameter side and the inner side of the claw contact ring 6. The claw holding contact surface 61 extends further outward from the outer diameter edge of the claw contact surface 60.

The claw holding contact surface 61 of the present embodiment is arranged between the claw holding portion 51 of the back lock ring 5C and the claw holding portion 51 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw holding portion 51 of the back lock ring 5C, the claw holding contact surface 61, and the claw holding portion 51 of the front lock ring 5D are arranged in this order. ing.

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

The deformed support surface 62 abuts on the claw holding back side surface 510 of the front side lock ring 5D. The deformed support surface 62 is a surface located on the outer diameter side and the front side of the claw contact ring 6. The deformed support surface 62 of the present embodiment is arranged between the claw holding portion 51 of the back lock ring 5C and the claw holding portion 51 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw holding portion 51 of the back lock ring 5C, the deformation support surface 62, and the claw holding portion 51 of the front lock ring 5D are arranged in this order. ..

Further, the deformation support surface 62 may be a flat surface or a curved surface, but is, for example, a flat surface. Further, the deformation support surface 62 is a surface perpendicular to the axial direction of the joint body 3. The deformed support surface 62 is a surface parallel to the claw contact surface 60 and the claw holding contact surface 61. Further, the deformation support surface 62 is arranged in a state of being separated from the claw holding contact surface 61 on the back side.

The portion outside the diameter of the deformed support surface 62 is chamfered. In the axial direction of the joint body 3, the distance (dimensions) between the deformed support surface 62 and the claw holding contact surface 61 is paired in a state in which the claw contact ring 6 is allowed to move in the radial direction. It suffices as long as it is sandwiched between the lock rings 5 of. For example, in the axial direction of the joint body 3, the distance between the deformed support surface 62 and the claw holding contact surface 61 is such that the claw holding back side surface 510 of the front side lock ring 5D and the claw holding front side of the back side lock ring 5C. It corresponds to the distance to the side surface 511.

The ring bottom surface 63 extends toward the front side from the inner tip edge of the claw contact surface 60. Specifically, the ring bottom surface 63 extends in the axial direction of the joint body 3. Further, the ring bottom surface 63 is located outside the diameter of the tip portion 520 of the claw 52 of the lock ring 5.

Further, 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, and is, for example, a flat surface. Further, 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 extending 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 the outer edge of the claw holding contact surface 61 and the outer edge of the deformed support surface 62. Further, the ring top surface 64 may be a flat surface or a curved surface, but is, for example, a flat surface. The ring top surface 64 extends in parallel with the flange inner surface 502 of the front side lock ring 5D. The portion on the back side and the portion on the front side of the ring top surface 64 of the present embodiment are chamfered.

The ring top surface 64 extends in parallel with the flange inner surface 502 of the front side lock ring 5D, for example. Further, the ring top surface 64 is arranged in a state of being separated from the flange inner surface 502 of the front side lock ring 5D inward in diameter. The radial distance between the ring top surface 64 and the flange inner surface 502 of the present embodiment is the same at any portion in the axial direction of the joint body 3 except for the chamfered portion of the ring top surface 64.

The connection surface 65 is arranged on the front side of the claw contact surface 60. Further, the connecting surface 65 may be a flat surface or a curved surface, and is, for example, a flat surface. Further, the connection surface 65 is arranged between the outer diameter portion and the claw 52 of the claw holding portion 51 of the back side lock ring 5C and the outer diameter portion and the claw 52 of the claw holding portion 51 of the front side lock ring 5D. Has been done. The connecting surface 65 is arranged in a state of being separated from the inner surface 522 of the claw of the front side lock ring 5D inward in diameter.

In the pipe joint 1 described above, since the claw contact surface 60 is provided on the claw contact ring 6, a pulling force acts on the pipe body 2A, and a force toward the front side is applied to the claw 52 of the back lock ring 5C. Even if the claw 52 is deformed toward the front side, the claw 52 abuts on the claw contact surface 60. At this time, the claw contact ring 6 is allowed to move in the radial direction in the annular space 53. Specifically, the back side lock ring 5C and the front side lock ring 5D are surrounded by the flange 50 in the radial direction, and the front side lock ring 5D abuts on the pressing surface 431 to regulate the movement to the front side. ing. Among such a back lock ring 5C and a front lock ring 5D, the claw contact ring 6 is allowed to be displaced in the radial direction, so that the claw contact ring 6 is a claw 52 of the back lock ring 5C. By centering by contact with the claw contact ring 6, the axial center of the claw contact ring 6 and the axial center of the tube body 2A are aligned with each other. Therefore, each claw 52 provided on the back lock ring 5C evenly hits the claw contact surface 60.

Then, when the pipe body 2A is further pulled out, the claw 52 of the back lock ring 5C has a diameter of the claw contact surface 60 of the claw 52 along the claw contact surface 60 of the claw contact ring 6. Since the portion located inside bites into the tube body 2A, the withdrawal of the tube body 2A is sufficiently regulated.

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 orthogonal to the pull-out direction of the pipe body 2A. Therefore, even if the tube body 2A is pulled out and a force is applied to the claw contact surface 60, the claw contact surface 60 can efficiently support the claw 52 of the back lock ring 5C.

Further, in the pipe joint 1 of the above embodiment, the claw holding contact surface 61 is located outside the diameter of the claw contact surface 60 and is located on the front side of the claw holding portion 51 of the back lock ring 5C. As a result, when a pulling force is generated in the tubular body 2A, the claw holding contact surface 61 comes into contact with the claw holding portion 51 of the back lock ring 5C from the front side, so that the claw holding portion 51 is deformed. Can be reliably regulated.

Further, in the pipe joint 1 of the above embodiment, the deformed support surface 62 comes into contact with the claw holding portion 51 of the front side lock ring 5D from the back side. Therefore, even if a pulling force is generated in the tubular body 2A, the claw 52 of the back lock ring 5C is deformed, and pressure is applied to the claw contact surface 60 and the claw holding contact surface 61, the claw contact ring 6 is used. The deformed support surface 62 can support the claw contact surface 60 and the claw holding contact surface 61 so as not to shift to the back side.

In the pipe joint 1 of the above embodiment, the distance between the ring bottom surface 63 of the claw contact ring 6 and the axial center α of the joint body 3 is the inner tip edge 343 of the locking surface 341 of the joint body 3 and the joint body 3. The claw contact ring 6 is arranged so that the distance from the axis α of the claw is the same. As a result, the ring bottom surface 63 of the claw contact ring 6 is arranged as far as the inner tip edge 343 of the locking surface 341 of the joint body 3 from the axis α of the joint body 3. Therefore, when the pipe body 2A is inserted into the joint body 3, it is possible to prevent the claw contact ring 6 from interfering with the pipe body 2A, and when a pulling force acts on the pipe body 2A, the back side. The claw 52 of the lock ring 5C abuts on the claw contact surface 60 as widely as possible, and the claw 52 can be made to bite into the tube body 2A.

Although the present invention has been described by taking up one embodiment, the present invention is not limited to the above-described embodiment.

The claw contact ring 6 of the above embodiment includes a claw holding contact surface 61, a deformed support surface 62, and the like in addition to the claw contact surface 60, but at least the claw contact surface 60 may be provided. .. For example, it is conceivable that the claw contact ring 6 does not include the claw holding contact surface 61. It is also conceivable that the claw contact ring 6 does not include the deformed 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 contact surface 60 may extend along the direction in which the claw 52 of the back lock ring 5C extends. An embodiment including the claw contact ring 6 having such a configuration will be described in detail below with reference to FIGS. 5 to 7. The configuration other than the claw contact ring 6 is the same as the above configuration.

As shown in FIGS. 5 and 6, the claw contact ring 6 is housed 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 displacement movement in the radial direction is allowed (see FIG. 6). Further, the claw contact ring 6 of the present embodiment is made of metal.

Further, the claw contact ring 6 is arranged on the front side of the claw 52 of the back lock ring 5C, and when the claw 52 of the back lock ring 5C is deformed to the front side, the claw contact ring 6 comes into contact with the claw 52 from the front side. It has a claw contact surface 60. The claw contact ring 6 of the present embodiment includes a claw holding contact surface 61 located on the outer diameter of the claw contact surface 60 and on the front side of the claw holding portion 51 of the back lock ring 5C. Further, the claw contact ring 6 includes a deformed support surface 62 that contacts the claw holding portion 51 of the front side lock ring 5D from the back side.

The claw contact ring 6 of the present embodiment has a ring bottom surface 63 as a ring bottom surface portion located inside the diameter of the claw contact surface 60. Further, the claw contact ring 6 has a ring top surface 64 located on the outer diameter. Further, the claw contact ring 6 has a front side connecting surface 65 that connects the inner tip edge of the deformed support surface 62 and the front side end edge of the ring bottom surface 63. The claw contact ring 6 has a back connection surface 66 that connects the inner tip edge of the claw contact surface 60 and the back end edge of the ring bottom surface 63.

The claw contact surface 60 is, for example, a surface of the claw 52 of the back lock ring 5C that abuts on a portion other than the tip portion 520. Specifically, the claw contact surface 60 faces a portion of the claw 52 of the back lock ring 5C that is outside the diameter (for example, a portion that is half or less of the outside diameter of the claw 52). Further, the claw contact surface 60 is separated from the outer diameter portion of the claw 52 of the back lock ring 5C.

The claw contact surface 60 is a surface located inside and behind the diameter of the claw contact ring 6. The claw contact surface 60 of the present embodiment is arranged between the claw 52 of the back lock ring 5C and the claw 52 of the front lock ring 5D. That is, from the back side to the front side of the joint body 3, the claw 52 of the back lock ring 5C, the claw contact surface 60, and the claw 52 of the front lock ring 5D are arranged in this order.

Further, the claw contact surface 60 extends along the direction in which the claw 52 of the back lock ring 5C extends. For example, the claw contact surface 60 extends in a direction different from that of the claw holding contact surface 61. The claw contact surface 60 of the present embodiment is radially continuous with the claw holding contact surface 61.

The claw contact surface 60 has an extension tip portion 601. The extending tip portion 601 is arranged so as to be separated from the inner diameter tip edge of the claw outer surface 521, which is the front side surface of the claw 52 of the back lock ring 5C, by a predetermined distance. The claw contact surface 60 may be a flat surface or a curved surface, and is, for example, a flat surface.

Further, in the claw contact ring 6 of the present embodiment, 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 the inner tip edge of the locking surface 341 of the joint body 3. It is arranged so as to be larger than the distance between the 343 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 between the inner tip edge 433 of the holding surface 431 of the cap member 4 and the axial center α of the joint body 3. Greater than the distance. As the inner tip edge of the chamfered part such as the locking surface 341 and the holding surface 431, the inner tip edge before the chamfering of this part is performed (assuming that the chamfering is not performed). Is used.

The portion outside the diameter of the deformed support surface 62 is chamfered. The distance (dimensions) between the deformed support surface 62 and the claw holding contact surface 61 in the axial direction of the joint body 3 is a pair in a state in which the claw contact ring 6 is allowed to move in the radial direction. It suffices to be sandwiched between the lock rings 5 of the above, and for example, the distance between the claw holding back side surface 510 of the front side lock ring 5D and the claw holding front side surface 511 of the back side lock ring 5C is the same.

Further, as shown in FIG. 7, 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, and is, for example, a flat surface. Further, 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 extending surface 352 of the joint body 3 and the axis α of the joint body 3 ( (See FIG. 6).

Further, the ring top surface 64 extends in parallel with the flange inner surface 502 of the front side lock ring 5D, for example. Further, the ring top surface 64 is arranged in a state of being separated from the flange inner surface 502 of the front side lock ring 5D inward in diameter. The radial distance between the ring top surface 64 and the flange inner surface 502 of the present embodiment is the same at any portion in the axial direction of the joint body 3 except for the chamfered portion of the ring top surface 64.

The front side connecting surface 65 is arranged on the front side of the claw contact surface 60. Further, the front side connecting surface 65 may be a flat surface or a curved surface, and is, for example, a flat surface. Further, the front side connecting surface 65 is between the outer diameter portion and the claw 52 of the claw holding portion 51 of the back side lock ring 5C and the outer diameter portion and the claw 52 of the claw holding portion 51 of the front side lock ring 5D. Is located in. The front side connecting surface 65 is arranged in a state of being separated inward from the claw inner surface 522 of the front side lock ring 5D.

The back side connecting surface 66 is arranged on the back side of the claw contact surface 60. Further, the back side connecting surface 66 may be a flat surface or a curved surface, and is, for example, a flat surface. The back connection surface 66 is a surface perpendicular to the axial direction of the joint body 3. Further, the back side connecting surface 66 extends inward in diameter from the inner tip edge 600 of the claw contact surface 60.

The back side connecting surface 66 is arranged between the claw 52 of the back side lock ring 5C and the claw 52 of the front side lock ring 5D. The back side connecting surface 66 is arranged in a state of being separated from the claw outer surface 521 of the front side lock ring 5D on the front side. The inner tip edge 660 of the back connecting surface 66 of the present embodiment is located on the outer diameter of the inner tip edge of the claw 52 of the back lock ring 5C and the front lock ring 5D.

Further, in the claw contact ring 6 of the present embodiment, the distance between the inner tip edge 660 of the back connection surface 66 and the axial center α of the joint body 3 is the inner tip edge of the locking surface 341 of the joint body 3. It is arranged so as to match the distance between the 343 and the axial center α of the joint body 3. The distance between the inner tip edge 660 of the back connection surface 66 and the axial center α of the joint body 3 is between the inner tip edge 433 of the holding surface 431 of the cap member 4 and the axial center α of the joint body 3. Matches the distance of.

In the pipe joint 1 described above, the claw contact ring 6 is provided with the claw contact surface 60 extending in the direction in which the claw 52 of the lock ring 5 extends, so that a pulling force acts on the pipe body 2A. Even if the claw 52 of the back lock ring 5C is deformed toward the front side, the claw 52 abuts on the claw contact surface 60. At this time, since the deformation of the claw 52 of the back lock ring 5C is restricted by the claw contact surface 60, a portion of the claw 52 located inside the diameter of the claw contact surface 60 (for example, the tip portion 520). ) Firmly bites into the tube 2A, so that the withdrawal of the tube 2A is sufficiently regulated.

In the pipe joint 1 of the above embodiment, the extending tip portion of the claw contact surface 60 is separated from the inner tip portion of the inner diameter of the front side surface of the claw 52 of the back lock ring 5C by a predetermined distance. Therefore, since the tip portion 520 of the claw 52 of the back lock ring 5C and the claw contact surface 60 are separated from each other, the tip of the claw 52 of the back lock ring 5C when a pulling force is generated in the tubular body 2A. Since the portion 530 is surely deformed and bites into the pipe body 2A, the withdrawal of the pipe body 2A can be surely regulated.

Further, in the pipe joint 1 of the above embodiment, since the ring bottom surface 63 is flat, even if the ring bottom surface 63 hits the pipe body 2A, the pipe body 2A is not damaged by the ring bottom surface 63. 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 secured, so that a pulling force is generated in the tube body 2A and the claw 52 of the back side lock ring 5C is generated. Even if the ring is deformed, the ring bottom surface 63 can support the claw contact surface 60 so as not to shift to the back side.

The claw contact ring 6 of the above embodiment includes a claw holding contact surface 61, a deformed support surface 62, and the like in addition to the claw contact surface 60, but at least the claw contact surface 60 may be provided. .. For example, it is conceivable that the claw contact ring 6 does not include the claw holding contact surface 61 or the deformed support surface 62. It is also conceivable that the claw contact ring 6 does not include the ring bottom surface 63.

The claw contact ring 6 of the above embodiment is housed in the annular space 53 in a state where the displacement movement in the radial direction is permitted, but the present invention is not limited to this. For example, it is conceivable that the claw contact ring 6 is accommodated in the annular space 53 in a state of being fixed in the radial direction. In this case, it is conceivable that the ring top surface 64 is arranged in a state of extending in parallel with the flange inner surface 502 of the front side lock ring 5D and in contact with the flange inner surface 502 of the front side lock ring 5D, for example.

The extending tip portion 601 of the claw contact surface 60 of the above embodiment is arranged so as to be separated from the inner diameter tip portion of the claw outer surface 521 of the back lock ring 5C by a predetermined distance to the outer diameter, but the present invention is limited to this. Absent. For example, the extending tip portion 601 of the claw contact surface 60 may be in contact with the inner diameter tip portion of the claw outer surface 521 of the back lock ring 5C.

The ring bottom surface 63 of the claw contact ring 6 of the above embodiment was a flat surface, but it may be a curved surface. For example, the ring bottom surface 63 may be a curved surface having a convex shape toward the inside of the diameter.

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 was assembled to the joint body 3 by screw fastening, but it may be assembled by another method such as fitting.

According to this configuration, since the claw contact surface is provided on the claw contact ring, even if a pulling force acts on the tube body and the claw of the back lock ring is deformed to the front side, this claw is clawed. Contact the contact surface. At this time, since the claw contact ring is allowed to shift in the radial direction in the annular space, the claw contact ring is centered by contact with the claw of the back lock ring, so that the claw contact ring The axis of the tangent ring and the axis of the inserted tube are aligned. Therefore, each claw provided on the back lock ring evenly hits the claw contact surface. Then, when the tube body is pulled out further, the claw of the back lock ring is in a state along the claw contact surface of the claw contact ring, and the portion located inside the diameter of the claw contact surface of this claw is the tube. Since it bites into the body, the pulling out of the tube is sufficiently regulated.

According to this configuration, since the claw contact surface is a surface that spreads in a direction orthogonal to the pulling direction of the tube, even if the pulling of the tube progresses and a force is applied to the claw contact surface, the claw contact surface. The surface can efficiently support the claws of the back lock ring.

According to this configuration, when a pulling force is applied to the tubular body, the claw holding contact surface comes into contact with the claw holding portion of the back lock ring from the front side, so that the claw holding portion is surely deformed. Can be regulated to.

According to this configuration, even if the claw of the back lock ring is deformed due to the pulling force generated in the tube body, the deformed support surface of the claw contact ring is on the back side of the claw contact surface and the claw holding contact surface. It can be supported so that it does not slip.

According to this configuration, the inner tip edge of the claw contact ring is arranged as far as the inner tip edge of the holding surface of the cap member from the axis of the joint body. Therefore, when the pipe body is inserted into the joint body, it is possible to prevent the claw contact ring from interfering with the pipe body. Further, when a pulling force is generated in the tube body, the claw of the back lock ring can abut on the claw contact surface as widely as possible, and the claw can be made to bite into the tube body.

From the above, according to the present invention, it is possible to provide a pipe joint capable of sufficiently restricting the pulling out of the pipe body.

According to this configuration, since the claw contact surface is provided on the claw contact ring, even if a pulling force acts on the tube body and the claw of the back lock ring is deformed to the front side, this claw is clawed. Contact the contact surface. At this time, since the deformation of the claw of the back lock ring is regulated by the claw contact surface, the portion of the claw located inside the diameter of the claw contact surface firmly bites into the tube body, so that the tube body Sufficient regulation of withdrawal.

According to this configuration, since the inner tip of the claw of the back lock ring and the claw contact surface are separated from each other, the tip of the claw of the back lock ring is separated when a pulling force is applied to the tube body. Is surely deformed and bites into the tube body, so that the withdrawal of the tube body can be surely regulated.

According to this configuration, the bottom surface of the ring is flat or curved, so even if the bottom surface of the ring hits the tube body, the bottom surface of the ring will not damage the tube body.

The pipe joint of the present invention is a pipe joint for connecting a pipe body, and is provided with an opening into which the pipe body is inserted, and the pipe body is inserted into the inner side through the opening. It is formed by bending a joint body, a tubular cap member to be assembled to the opening, an annular flange centered on the axial direction of the joint body, and the end portion of the flange toward the center side. It has an annular claw holding portion and a plurality of claws formed by bending in the axial direction on the inner surface side of the claw holding portion, and the flange is inside the diameter of the inner surface of the joint body. A pair of lock rings that are positioned and accommodated in the joint body side by side in the axial direction in a state where the claws extend toward the inner diameter side, and are arranged on the back side of the joint body. The cap member includes a pair of lock rings including a lock ring and a front side lock ring arranged on the front side of the joint body, and the cap member has a pressing surface for pressing the front side lock ring from the front side. The pair of lock rings are configured such that the claws are locked to the outer peripheral surface of the inserted tubular body to restrict the pulling out of the tubular body, and the flange, the claw holding portion, etc. of the front side lock ring. Further, a claw contact ring accommodated in an annular space surrounded by a claw is further provided, and the claw contact ring is arranged on the front side of the claw of the back side lock ring, and the back side lock ring is provided. Has a claw contact surface that comes into contact with the claw from the front side when the claw is deformed to the front side, and the claw of the back lock ring extends inward in diameter from the claw contact surface and comes into contact with the claw. The surface extends along the direction in which the claws of the back lock ring extend.

1 ... Pipe fitting, 2A, 2B ... Pipe body, 3 ... Joint body, 4 ... Cap member, 5 ... Lock ring, 5C ... Back side lock ring, 5D ... Front side lock ring, 6 ... Claw contact ring, 7A, 7B ... Pipe fitting, 8 ... Seal ring, 20A ... Deepest end face, 30 ... Opening, 31 ... Main body side insertion space, 32 ... Main body large diameter part, 33 ... Main body small diameter part, 34 ... First main body small diameter part, 35 ... Second main body small diameter part, 40 ... Cap side insertion space, 41 ... Reduction part, 42 ... Cap large diameter part, 43 ... Cap small diameter part, 50 ... Flange, 51 ... Claw holding part, 52 ... Claw, 53 ... Circular Space, 60 ... Claw contact surface, 61 ... Claw holding contact surface, 62 ... Deformation support surface, 63 ... Ring bottom surface, 64 ... Ring top surface, 65 ... Connection surface (front side connection surface), 66 ... Back side connection Surface, 80 ... Large diameter seal ring, 81 ... Auxiliary seal ring, 82 ... Small diameter seal ring, 101 ... Pipe fitting, 103 ... Joint body, 104 ... Cap member, 105 ... Lock ring, 150 ... Flange, 151 ... Claw holder , 152 ... Claw, 310 ... Lock ring accommodating part, 320 ... Main body side large diameter seal accommodating part, 321 ... Main body side first contact surface, 340 ... Main body side second contact surface, 341 ... Locking surface, 342 ... Main body side facing surface, 343 ... Inner tip edge, 350 ... Stepped surface, 351 ... Stepped wall, 352 ... Extended surface, 410 ... Auxiliary seal accommodating part, 420 ... Cap side large diameter seal accommodating part, 421 ... Cap side first One contact surface, 430 ... Small diameter portion back end surface, 431 ... Pressing surface, 432 ... Cap side second contact surface, 433 ... Inner tip edge, 434 ... Guide surface, 435 ... Cap side small diameter seal accommodating portion, 500 ... End, 501 ... Flange outer surface, 502 ... Flange inner surface, 510 ... Claw holding back side surface 511 ... Claw holding front side surface, 520 ... Tip part 521 ... Claw outer surface, 522 ... Claw inner surface, 600 ... Inner tip edge, 601 ... Extension tip, 660 ... inner tip edge, α ... axis, C ... virtual circle

Claims

A pipe joint that connects pipes
An opening into which the pipe body is inserted is provided, and a tubular joint body into which the pipe body is inserted to the back side through the opening, and a tubular joint body.
A tubular cap member assembled to the opening and
A pair of lock rings including a back side lock ring arranged on the back side of the joint body and a front side lock ring arranged on the front side of the joint body, and each lock ring is a shaft of the joint body. An annular flange centered on the central direction, an annular claw holding portion formed by bending from the end of the flange toward the center of the flange, and from the claw holding portion to the inner side in the axial direction. The joint body has a plurality of bent claws, respectively, and the flange is located inside the diameter of the inner surface of the joint body, and the claws extend toward the inner side toward the inner surface. A pair of lock rings that are housed side by side in the axial direction.
A flange of the front lock ring, a claw holding portion, and a claw contact ring housed in an annular space surrounded by claws are provided.
The joint body has a locking surface that locks from the back side to the back side lock ring.
The cap member has a pressing surface that presses the front side lock ring from the front side.
The pair of lock rings are housed in a space surrounded by a locking surface of the joint body, a holding surface of the cap member, and an inner surface of the joint body, and the outer periphery of the pipe body inserted. The claws are locked to the surface to regulate the withdrawal of the tube body.
The claw contact ring is arranged on the front side of the claw of the back lock ring, and when the claw of the back lock ring is deformed to the front side, the claw contact surface that comes into contact with the claw from the front side is provided. Have and
The claw of the back lock ring extends inward in diameter from the claw contact surface.
The claw contact ring is a pipe joint characterized in that it is housed in a state in which displacement movement in the radial direction is permitted in the annular space.
The pipe joint according to claim 1, wherein the claw contact surface is a surface perpendicular to the axial direction.
The first or second aspect of the present invention, wherein the claw contact ring is provided with a claw holding contact surface located outside the diameter of the claw contact surface and located on the front side of the claw holding portion of the back lock ring. The described pipe joint.
The pipe joint according to any one of claims 1 to 3, wherein the claw contact ring includes a deformed support surface that contacts the claw holding portion of the front lock ring from the back side.
In the claw contact surface, the distance between the inner tip edge of the claw contact surface and the axial center of the joint body is the distance between the inner tip edge of the locking surface and the axial center of the joint body. The pipe fitting according to any one of claims 1 to 4, which is arranged so as to match the above.
A pipe joint that connects pipes
An opening into which the pipe body is inserted is provided, and a tubular joint body into which the pipe body is inserted to the back side through the opening, and a tubular joint body.
A tubular cap member assembled to the opening and
A pair of lock rings including a back side lock ring arranged on the back side of the joint body and a front side lock ring arranged on the front side of the joint body, and each lock ring is a shaft of the joint body. An annular flange centered on the central direction, an annular claw holding portion formed by bending from the end of the flange toward the center of the flange, and an annular claw holding portion formed from the claw holding portion to the inner side in the axial direction. The joint body has a plurality of bent claws, respectively, and the flange is located inside the diameter of the inner surface of the joint body, and the claws extend toward the inner side toward the inner surface. A pair of lock rings that are housed side by side in the axial direction,
A flange of the front lock ring, a claw holding portion, and a claw contact ring housed in an annular space surrounded by claws are provided.
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 so that the claws are locked to the outer peripheral surface of the inserted tube body to restrict the withdrawal of the tube body.
The claw contact ring is arranged on the front side of the claw of the back lock ring, and when the claw of the back lock ring is deformed to the front side, the claw contact surface that comes into contact with the claw from the front side is provided. Have and
The claw of the back lock ring extends inward in diameter from the claw contact surface.
A pipe joint characterized in that the claw contact surface extends along a direction in which the claw of the back lock ring extends.
The pipe according to claim 6, wherein the extending tip portion of the claw contact surface is arranged so as to be separated from the inner tip portion of the inner diameter of the front side surface of the claw of the inner lock ring by a predetermined distance. Fittings.
The claw contact ring has a flat or curved ring bottom surface inside the diameter of the claw contact surface.
The pipe joint according to claim 6 or 7, wherein the bottom surface of the ring is located outside the diameter of the tip of the claw of the back lock ring.