JP2011185337A - Lock ring for pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock ring for a pipe joint, achieving a reduction in an insertion load and easily fitted to a fitting portion provided in the pipe joint. <P>SOLUTION: This lock ring 100 arranged in the pipe joint and preventing slipping-out of a pipe body inserted into the pipe joint includes: a cylindrical lock ring body 2 having a slit 21 formed over the whole length in a length direction in one portion in a peripheral direction; and a plurality of pipe body retaining claws (pipe body retaining claws 31 on an insertion side and pipe body retaining claws 41 on a delivery side) provided in the peripheral direction in at least one portion of an intermediate portion in the length direction of the lock ring body 2. The pipe body retaining claws 31, 41 are formed to be projected toward the inner direction of the lock ring body 2 and a pipe body delivery direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lock ring for a pipe joint. More specifically, in the present invention, the lock ring body has a slit, and the diameter can be increased when the tube is inserted, so that the load for inserting the tube is reduced, and the tube holding claw is the tube of the lock ring body. When it is provided on the insertion side and the tube delivery side, the insertion load can be further reduced, and the lock ring body can also be reduced in diameter, so it can be removed from the recess provided on the inner surface side of the joint member. The present invention relates to a lock ring for a pipe joint that can be easily fitted into a lock ring fitting portion or the like.

  Conventionally, there is known a one-touch joint including a joint body into which a pipe body is inserted, an annular receiving surface provided inside the joint body, a lock ring, a cylindrical pressing body, and the like (see, for example, Patent Document 1). ). The lock ring is engaged with the annular receiving surface, and is positioned and fixed by the pressing body in a joint formed by screwing the male thread portion of the pressing body with the female screw portion formed in the joint body. . The lock ring prevents the inserted resin pipe from coming out of the joint until it comes into contact with the contact surface provided in the joint body.

  The lock ring 34 includes a base ring 35 that is engaged with the receiving surface, and a plurality of restricting pieces 36 that protrude inward from the base ring 35 with substantially the same length (see FIG. 6). An annular base ring 35 provided in the lock ring 34 and a plurality of restricting pieces 36 protruding at a predetermined interval in the circumferential direction of the base ring 35 are formed by press molding. Furthermore, a claw having a predetermined length protrudes inwardly at the tip of each restricting piece, and protrusions projecting in the width direction of the restricting piece are provided on both sides of the restricting piece.

  In addition, when the pipe is inserted into the joint, the claw of the restriction piece provided in the lock ring bites into the pipe in the required amount, preventing the pipe from coming off from the joint, and the claw is prevented by the protrusions on both sides of the restriction piece. Biting more than necessary is prevented, and the restriction piece is prevented from penetrating the pipe wall.

JP 2000-46282 A

  However, since the lock ring described in Patent Document 1 has many restriction pieces protruding in the circumferential direction of the base ring, when an external force in the pulling direction acts on the pipe inserted into the joint, Regulating pieces can bite into many parts of the circumference, resulting in tears. Further, when the external force is larger, there is a possibility that water or hot water leaks out, or the tears spread and the pipe breaks.

  Furthermore, conventionally, two lock rings have been used to distribute the load applied to each convex piece (regulating piece) during pipe insertion, to prevent pipe tearing and to prevent pipe breakage due to the rise of the convex piece. However, in this case, the load at the time of pipe insertion becomes larger and the insertion is not easy due to the more convex pieces that are close to each other. Further, since the conventional lock ring has an annular base ring, the outer diameter is increased, the inner and outer diameters of the joint main body are increased, and there is a problem that the construction is difficult and the construction is difficult. Further, in the conventional lock ring, a pressing member for fixing is essential, and it is necessary to provide a joint body having a threaded portion, the structure of the pipe joint becomes complicated, and the installation work of the lock ring is complicated.

  The present invention has been made in view of the above-described conventional situation, and since the lock ring body has a slit and can be expanded in diameter when the tube is inserted, the load for inserting the tube can be reduced. In addition, since the lock ring body can be reduced in diameter, it can be easily fitted into a lock ring fitting portion formed of a recess provided on the inner surface side of the joint member (hereinafter referred to as “ The purpose is to provide a "lock ring".

The present invention is as follows.
1. A lock ring for a pipe joint that is disposed in a pipe joint and prevents the pipe body inserted into the pipe joint from coming out,
A slit provided over the entire length of the longitudinal direction at one place in the circumferential direction, and a circumferential shape at least at one place of the cylindrical lock ring main body and the intermediate portion of the lock ring main body in the length direction. A plurality of tube-holding claws provided in a direction,
The tube coupling lock ring is characterized in that the tube body holding claw is provided so as to protrude in an inward direction of the lock ring body and in a tube body feeding direction.
2. The tube holding claws are provided at intervals over the entire circumference of the lock ring body in the circumferential direction. Lock ring for pipe joints as described in 1.
3. The insertion ring holding nail provided on the tube insertion side in the length direction of the lock ring main body, and the sending tube holding nail provided on the tube sending side. Or 2. Lock ring for pipe joints as described in 1.
4). 2. The insertion positions of the insertion-side tube holding claws and the delivery-side tube holding claws are displaced in the circumferential direction of the lock ring body. Lock ring for pipe joints as described in 1.

According to the lock ring for a pipe joint of the present invention, since the lock ring body having a slit can be expanded in diameter when the pipe body is inserted, the insertion load is reduced. In addition, when fitting into a lock ring fitting portion or the like provided on the inner surface side of a joint member made of a resin molded body, the lock ring body can be reduced in diameter so that it can be easily fitted, Other members such as a pressing member are not required. Furthermore, since it does not have a flange like a conventional lock ring, the outer diameter of the lock ring can be reduced, and the inner and outer diameters of the pipe joint can also be reduced. This is also advantageous in terms of safety. In addition, in a conventional lock ring having a collar part, if a large load is applied in the pulling direction, the collar part receives a load, and the collar part may be bent or torn. The ring body has sufficient strength and does not tear. Furthermore, since it can be manufactured by making a flat preform into a cylindrical shape, compared to a conventional lock ring that is annular and manufactured by punching the center portion, generation of end materials is generated. Few.
In addition, when the tube holding claws are provided at intervals over the entire circumference in the circumferential direction of the lock ring body, the tube body can be held more stably over the entire circumference. When a large load is applied in the direction, an excessive load is not partially applied in the circumferential direction, and the tube holding claws are not continuous in the circumferential direction, so that the tube body is prevented from being damaged, Breakage is prevented.
Furthermore, when it has an insertion side tube holding claw provided on the tube insertion side in the length direction of the lock ring body and a delivery side tube holding claw provided on the tube delivery side, when inserting the tube Since the tube holding claws that must be pressed and deformed are distributed at two locations in the length direction of the lock ring body, the insertion load can be further reduced and the tube can be more reliably prevented from coming out. be able to.
Also, if the placement positions of the insertion-side tube holding claw and the delivery-side tube holding claw are shifted in the circumferential direction of the lock ring body, the insertion-side tube holding claw and the delivery-side tube holding claw With the nail, a larger portion of the tube body in the circumferential direction can be held, the tube body can be held more stably, and slipping out can be prevented more reliably.

It is a top view of the flat-shaped preform before the nail | claw piece used as a holding | maintenance nail is bent, and before rounding into a cylindrical shape. 1 is a plan view of the lock ring of the present invention, which is formed by bending the nail piece of the preformed body of FIG. 1 to form a tube body holding claw and rounding it into a cylindrical shape in the width direction. FIG. FIG. 3 is a side view of the lock ring of FIG. 2. FIG. 3 is a partial cross-sectional view of a pipe joint in which the lock ring of the present invention is fitted into a lock ring fitting portion provided on the inner surface side of a resin joint member. It is a partial cross section figure showing a mode that the pipe body was inserted in the pipe joint of FIG. (A) is a top view of the conventional lock ring provided with a base ring and a control piece, (b) is a side view.

Hereinafter, the present invention will be described in detail with reference to the drawings.
The lock ring for a pipe joint of the present invention is disposed in the pipe joint and is used to prevent the pipe body inserted into the pipe joint from coming out.
The lock ring 100 has a slit 21 provided at one place in the circumferential direction over the entire length in the length direction, and has a cylindrical lock ring main body 2 and an intermediate portion in the length direction of the lock ring main body 2. A plurality of tube holding claws provided in the circumferential direction at least at one location and projecting toward the inner direction of the lock ring body 2 and the tube feeding direction [for example, the insertion side tube holding claw 31 and the sending side tube Body holding claws 41 (see FIGS. 2 and 3)].

[1] Pipe Joint The “pipe joint 200” (see FIGS. 4 and 5) is one joint member (for example, FIG. 4) into which the pipe body 5 used for transferring and supplying water or hot water is inserted and fixed. No. 5 resin joint member 6) is connected to the other joint member (see, for example, metal joint member 7 in FIGS. 4 and 5) and fixed. The one joint member and the other joint member include a resin-side fitting portion 61 in which an uneven portion is provided on the outer peripheral surface of the resin joint member 6, and an uneven portion on the inner peripheral surface of the metal joint member 7. Is inserted into the metal-side fitting portion 71, and then the joint-side fixing sleeve 61 having a diameter slightly larger than the inner diameter of the resin-side fitting portion 61 is fitted into the resin-side fitting portion 61 to expand the diameter. By bringing the outer peripheral surface of the resin-side fitting portion 61 and the inner peripheral surface of the metal-side fitting portion 71 into close contact, they can be fixed and connected together.

  In the pipe joint 200, the lock ring 100 can be fitted into the lock ring fitting portion 62 provided on the inner surface side of the resin joint member 6 to prevent the inserted pipe body 5 from coming out. The lock ring fitting portion 62 may be recessed in the inner surface of the resin joint member 6, but a large load may be applied in the direction in which the tubular body 5 is pulled out. It is preferable that a metal other member M having a lock ring fitting portion 62 is fitted on the inner surface side (see FIGS. 4 and 5). Thus, the end surface of the tube insertion side end portion 3 of the lock ring 100 abuts against the insertion side end surface 621 of the lock ring fitting portion 62, and the lock ring 100 is reliably prevented from coming out, and other members. Is made of metal, damage to the insertion-side end surface 621 of the lock ring fitting portion 62 due to contact of the lock ring 100 is prevented (see FIGS. 4 and 5).

  Moreover, in the pipe joint 200, the O-ring 9 that is in contact with the delivery-side end surface 622 of the lock ring fitting portion 62 and the spacer 8 that is in contact with the O-ring 9 are generally provided (see FIGS. 4 and 5). The outer surface of the tube 5 to be inserted comes into contact with the O-ring 9 (see FIG. 5), and water or warm water is prevented from leaking from the O-ring 9 to the insertion side. The material of the O-ring 9 is not particularly limited, and various rubbers, particularly silicone rubber having excellent physical properties such as excellent water repellency and water resistance and low compression set, are frequently used.

Further, the end surface of the tube body delivery side end portion 4 of the lock ring 100 abuts on the surface of the spacer 8 opposite to the side on which the O-ring 9 contacts, and the lock ring 100 is fixed. The material of the spacer 8 is not particularly limited, and may be a metal such as stainless steel. Since a large load is not applied in the insertion direction of the tube body 5, a resin such as a crosslinked polyethylene may be used in the same manner as the resin joint member 6. Good.
In addition, if the step part for latching the spacer 8 is formed in the inner surface of the resin joint member 6, and the one surface of the spacer 8 is made to contact | abut to a step part, the metal which has the lock ring insertion part 62 The spacer 8 may be pressed and fixed from the other surface by the other member M manufactured (see FIGS. 4 and 5).

[2] Tube As the tube 5, a normal tube used for transferring or supplying water or hot water can be used, and the material, inner and outer diameters, etc. of the tube 5 are not particularly limited. The pipe body 5 preferably has excellent water resistance because water or warm water flows through the inside, and since it is often used for warm water, it is also preferable to have heat resistance. Furthermore, from the viewpoint of having excellent low-temperature brittleness and the like that does not cause brittle fracture even at low temperatures such as in winter, and can be easily inserted into the pipe joint 200, usually, using crosslinked polyethylene, polybutene, or the like. A tubular body 5 is used.

[3] Lock ring for pipe joint The “lock ring 100” can be produced by a preform 1 (see FIG. 1) made of a flat belt-shaped stainless steel. The preform 1 has a circumferential direction in at least one place between the belt-like portion 11 and the lengthwise direction of the belt-like portion 11 (the direction connecting the tube insertion side end 3 and the tube delivery side end 4). A plurality of claw pieces provided [for example, a claw piece 121 to be the insertion side tube holding claw 31 and a claw piece 122 to be the delivery side tube holding claw 41 (see FIG. 1), hereinafter this lock ring body A preferred embodiment in which the tube-holding claws 31 and 41 are provided in the circumferential direction at two locations in the middle portion in the length direction of 2 will be described. ]. The nail pieces 121 and 122 can be formed by punching a predetermined portion of the preform 1 into a U shape or the like when viewed in the length direction (see FIG. 1). Further, the width of the belt-like portion 11 is rounded into a cylindrical shape so that when both end portions in the width direction are brought into contact with each other, a cylindrical shape having a predetermined diameter based on the outer diameter of the inserted tubular body is formed. Set to

  The lock ring 100 bends the claw pieces 121 and 122 that become the tube holding claws 31 and 41 in the direction of one surface of the preform 1, and then the preform 1 is brought into contact with both ends in the width direction. In addition, each of the formed pipe joint holding claws 31 and 41 can be rolled up so as to face the inner surface side. In this case, both end portions in the width direction of the preform 1 do not necessarily have to be in exact contact with each other, both end portions may overlap, and the end portions may be separated from each other. It is preferable that the contact be as accurate as possible.

  The lock ring 100 manufactured as described above has the “slit 21” provided over the entire length in the circumferential direction at one place in the circumferential direction, and the “lock ring body 2” is cylindrical. (See FIGS. 2 and 3). Since the lock ring body 2 can be expanded and contracted in the radial direction, for example, when the tube body 5 is inserted, the lock ring body 2 is expanded to reduce the load at the time of insertion. And the tube body 5 can be inserted more easily. Further, the lock ring 100 is not recessed in the lock ring fitting portion 62 (see FIG. 4, the inner surface of the resin joint member 6) provided on the inner surface side of the resin joint member 6. As described above, it is preferable to use another metal member.) When fitting into the other member, the diameter can be easily reduced.

  Further, at the intermediate portion in the length direction of the lock ring main body 2, as described above, the claw pieces 121 and 122 are bent in the direction of the one surface side of the preform 1, so that the insertion side tube body holding claw 31 and A delivery-side tube holding claw 41 is provided (see FIGS. 2 and 3). These tube holding claws 31 and 41 are provided so as to protrude obliquely toward the inner direction of the lock ring body 2 and the tube feeding direction, thereby preventing the inserted tube 5 from being pulled out. . The angle of the tube body holding claws 31 and 41 with respect to the lock ring body 2 is preferably 10 to 80 °, particularly preferably 30 to 70 °. If this angle is too small, the tube body 5 may not be prevented from being pulled out sufficiently. If it is too large, the load when the tube body 5 is inserted increases, and when a load in the pull-out direction is applied, The tube body holding claws 31 and 41 may bite into the tube body 5 excessively, and the tube body 5 may be damaged.

  Moreover, the angle with respect to the length direction of the lock ring main body 2 of the tube body holding claws 31 and 41 may be the same, and may differ. Furthermore, since there are various types of pipe joints having different dimensions, the number of the tube body holding claws 31 and 41 is not particularly limited, and is preferably set as appropriate according to the dimensions of the pipe joint. Further, since the number of tube holding claws 31 and 41 can be easily adjusted, the number of tubes can be increased or decreased by a load applied in the pull-out direction, and the tube 5 can be prevented from being pulled out more reliably. .

  It is preferable that a plurality of the tube holding claws 31 and 41 are provided at intervals over the entire circumference in the circumferential direction of the lock ring body 2 and are arranged more evenly without being offset in the circumferential direction. Thereby, the tubular body 5 can be hold | maintained more reliably over the perimeter. Moreover, it is more preferable that the tube holding claws 31 and 41 are respectively provided at equal intervals in the circumferential direction of the lock ring body 2. If the intervals are equal, the tube 5 is extended over the entire circumference. It can be held more stably.

  Furthermore, it is preferable that the total ratio of the dimensions in the width direction of the tube holding claws 31 and 41 to the entire circumference of the lock ring main body 2 is 30 to 70%, particularly 40 to 60%. If this ratio is 30 to 70%, the tubular body 5 can be more reliably held over the entire circumference, and damage to the tubular body 5 due to the tubular body holding claws 31 and 41 is more sufficiently suppressed. be able to. This ratio may be the same or different between the tube-holding claws 31 and 41, but does not need to be particularly different.

  In addition, the tube body holding claws 31 and 41 may be arranged at different positions in the circumferential direction, or may be displaced, but it is preferable that they are displaced. That is, when the insertion side tube holding claw 31 is projected onto the tube delivery end 4, the respective arrangement positions are the same (the tube holding claws 31 and 41 are completely overlapped when viewed in the circumferential direction). )), But it is preferably shifted in the circumferential direction. Thereby, with the tube holding nail on the insertion side and the tube holding nail on the delivery side, it is possible to hold more portions in the circumferential direction of the tube 5 and the tube 5 is held more stably. Pull-out is more reliably prevented. The degree of deviation is not particularly limited, but it is preferable that the deviation is large, and when the lock ring 100 is viewed from the end on either side, the insertion-side tube holding claw 31 and the delivery-side tube holding claw 41 are not at all. It is more preferable that they are positioned so as not to overlap but to be seen alternately in the circumferential direction.

  Further, the insertion-side tube holding claw 31 and the delivery-side tube holding claw 41 are provided at intervals in the circumferential direction of the lock ring main body 2 but overlap each other in the length direction of the lock ring main body 2 (sideways). It means that they appear to overlap each other when viewed from the side). The interval in the length direction of the lock ring main body 2 between the tube body holding claws 31 and 41 is not particularly limited. For example, the end surface of the tube insertion side end portion 3 of the lock ring main body 2 and the base of the insertion side tube body holding claw 31 are used. The distance from the end (bending portion), the distance between the distal end surface of the insertion side tube holding claw 31 and the proximal end portion (bending member) of the sending side tube holding claw 41, and the tip of the sending side tube holding claw 41 It can arrange | position so that the distance of a surface and the end surface of the pipe body delivery side edge part 4 of the lock ring main body 2 may become the same distance, respectively.

  The tube holding claws 31 and 41 are the distance between the end surface of the tube insertion side end 3 of the lock ring main body 2 and the base end portion (folded portion) of the insertion side tube holding claw 31 and the delivery side tube. The distance between the distal end surface of the holding claw 41 and the end surface of the tube delivery side end 4 of the lock ring body 2 is such that the distal end surface of the insertion side tube holding claw 31 and the proximal end of the delivery side tube holding claw 41 (bending It is preferable that the arrangement is smaller than the distance to the portion. That is, the tube holding claws 31 and 41 are disposed near the end surface of the tube insertion side end portion 3 of the lock ring main body 2 and the end surface of the tube body delivery side end portion 4, respectively. It is preferable that the distance between the distal end surface of the tube and the proximal end portion (folded portion) of the delivery-side tube holding claw 41 is large. Thus, if the tube body holding claws 31 and 41 are arranged sufficiently apart from each other, the tube body 5 can be inserted more easily, and the tube body 5 can be held more stably, and The tube body 5 is more reliably prevented from coming out.

  As described above, it is preferable that the tube body holding claws 31 and 41 are provided at an appropriate distance, but the insertion side tube body holding claw 31 is disposed on the end surface of the tube body insertion side end portion 3. When the delivery-side tube holding claw 41 is provided too close to the end surface of the tube delivery-side end 4, the tube-insertion-side end 3 and the tube delivery-side end 4 of the lock ring body 2 are provided. The lock ring 100 may be deformed when the strength is reduced, and particularly when a large load is applied in the direction in which the tubular body 5 is pulled out. Therefore, the arrangement positions of the tubular body holding claws 31 and 41 are determined in consideration of this point. Must be set.

  The lengths of the plurality of insertion-side tube-holding claws 31 may be the same or different, but it is not preferable to make them different, and they are usually the same. As described above, the insertion-side tube-holding claw 31 is formed by bending the claw piece 121 of the preformed body 1 in the direction of the one surface side of the preforming body 1. Is the shortest dimension from the proximal end portion of the bent portion to the distal end surface of the insertion-side tube body holding claw 31. Further, the same length means that the dimensions can be processed within the accuracy of punching and bending.

  Further, the lengths of the plurality of delivery-side tube holding claws 41 may be the same or different, but it is not preferable to make them different, and they are usually the same. As described above, the delivery-side tube holding nail 41 is formed by bending the nail piece 122 of the preform 1 in the direction of one surface of the preform 1. Is the shortest dimension from the proximal end portion of the bent portion to the distal end surface of the delivery-side tube body holding claw 41. The same length means the same as in the case of the insertion side tube holding claw 31 described above.

  The dimension of each part of the lock ring 100 is not particularly limited, and can be set according to the outer diameter of the inserted tube 5 or the like. Moreover, the width | variety of each tube body holding nail may be the same over the full length, and may become narrow from the base end part to the front end surface side.

  In the configuration in which the tube holding claws 31 and 41 provided adjacent to each other in the circumferential direction are connected in a slit shape between them, when an impact is applied to the lock ring 100 by a water hammer or the like. Moreover, since a tear may arise from the base end part of the tube body holding claws 31 and 41, it is preferable that it is spaced apart. As described above, the nail pieces 121 and 122 provided by punching a predetermined portion of the preform 1 in a U shape when viewed in the length direction are bent in the direction of the one surface side of the preform 1 to obtain a tube. When the body holding claws 31 and 41 are formed, a certain amount of space is required between the punched portions, and the thickness of the punching blade is also present, so that the tube holding claws 31 and 41 adjacent to each other in the circumferential direction are necessarily separated from each other. Provided.

  As described above, when the insertion-side tube holding claw 31 and the delivery-side tube holding claw 41 are provided apart from each other, the tube holding claw is applied when an impact is applied to the lock ring 100 by a water hammer or the like. It is possible to provide a lock ring 100 in which tears are prevented from being generated from the base end portions of 31 and 41 and the tubular body 5 is stably held for a long period of time. Further, the punching blade itself does not have an acute angle portion in the cross-sectional shape, and for example, as shown in FIG. 1, it is preferable that the corner portions of the nail pieces 121 and 122 have an arc shape. Also by this, when an impact is applied, it is possible to prevent a tear from occurring from the base end portion of the tube body holding claws 31 and 41 and the like.

As described above, the lock ring 100 can be manufactured using the preform 1 made of stainless steel, but the claw pieces 121 and 122 are formed by punching a stainless steel sheet with a punching blade. The corners in the thickness direction of the nail pieces 121 and 122 may be acute and burrs may occur. Therefore, the corners in the thickness direction of the insertion-side tube holding claw 31 and the delivery-side tube holding claw 41 using the nail pieces 121 and 122 are also acute, and burrs may remain. Will be easily damaged. Therefore, it is preferable to round off corners such as the nail pieces 121 and 122 of the preform 1 and remove burrs by barrel processing, shot peening, sandblasting, or the like.
The rounding of the corners and the removal of burrs may be performed after the preform 1 is processed into the lock ring 100 form.

  Note that the present invention is not limited to the description of the above-described embodiments, and various modifications can be made within the scope of the present invention depending on the purpose, application, and the like. For example, the tube holding claws may be provided only at one place in the middle portion in the length direction of the lock ring main body 2 or may be provided at three places. In addition, the tube holding claws are usually not required to be provided at four or more locations, and are preferably provided at 1 to 3 locations from the viewpoint of the strength of the lock ring 100, and more preferably at 2 locations as described above. preferable.

  When the tube body holding claw is provided only in one place, it may be on either end side in the length direction of the lock ring main body 2 and may be on the center portion in the length direction, but it is not necessary to be provided on the end side in particular. What is necessary is just to provide in a center part. Further, when the tube holding claws are provided at three locations, they may be provided at both ends and the center of the tube insertion side and the tube delivery side.

  INDUSTRIAL APPLICABILITY The present invention can be used in the technical field of a pipe joint that connects a pipe used for transferring water or hot water to a supply source or destination such as water or hot water with one touch by hand. For example, it is useful in the technical field of preventing end portions of resin pipes used for hot water pipes such as water pipes, floor heating and load heating from coming out of pipe joints.

  DESCRIPTION OF SYMBOLS 1; Preliminary body, 11; Strip | belt-shaped part, 121; Nail piece used as insertion side tube holding nail, 122; Nail piece used as sending side tube holding nail, 100; Lock ring, 2; Lock ring main body, 21; slit, 3; tube insertion side end, 31; insertion side tube holding claw, 4; tube delivery side end, 41; delivery side tube holding claw, 5; tube, 200; 6; resin joint member, 61; resin side fitting portion, 62; lock ring fitting portion, M; other metal member having a lock ring fitting portion, 621; insertion side end surface, 622; 7; Metal joint member, 71; Metal side fitting portion, 8; Spacer, 9; O-ring.

Claims (4)

A lock ring for a pipe joint that is disposed in a pipe joint and prevents the pipe body inserted into the pipe joint from coming out,
A lock ring body having a cylindrical shape having a slit provided over the entire length in the longitudinal direction at one place in the circumferential direction;
A plurality of tube-holding claws provided in the circumferential direction at at least one intermediate portion in the length direction of the lock ring body,
The tube coupling lock ring is characterized in that the tube body holding claw is provided so as to protrude in an inward direction of the lock ring body and in a tube body feeding direction.   2. The lock ring for a pipe joint according to claim 1, wherein the tube body holding claws are provided at intervals over the entire circumference in the circumferential direction of the lock ring body.   The insertion-side tube holding claw provided on the tube insertion side in the length direction of the lock ring body, and a delivery-side tube holding claw provided on the tube delivery side. Lock ring for pipe fittings.   The lock ring for a pipe joint according to claim 3, wherein the insertion positions of the insertion-side tube holding claws and the delivery-side tube holding claws are displaced in the circumferential direction of the lock ring body.

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