JP2006183764A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint capable of regulating separation of a confirming means from the joint. <P>SOLUTION: A joint body 13 forming a cylindrical shape is formed with a tube insertion space 26 for inserting and connecting an end of a tube material 11, and it is provided with a through hole 31 communicated with the tube insertion space 26. A female thread 32 having a thread groove 32a is formed in an inner end side of the through hole 31. The confirming means is provided in the through hole 31 for confirming an inserted state of the tube material 11 by the tube material 11 inserted into the tube insertion space 26. The confirming means is composed of a cylindrical collar member 34, and a shaft member 41 fit in the collar member 34. The collar member 34 is composed such that an inner end side when attached in the through hole 31 is divided into four segments 37 by axially extending slits to allow expansion and contraction. An engagement projection 38 is provided on an outer circumferential face of each segment 37, and it can be engaged with the thread groove 32a of the female thread 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to, for example, a joint (pipe joint) for connecting ends of pipes or an end of pipes and a faucet instrument in a water supply / hot water system piping system.

  2. Description of the Related Art Conventionally, a joint having a structure in which an end portion of a pipe material such as a synthetic resin pipe is inserted and connected is provided with a confirmation means for confirming the insertion state of the pipe material (see, for example, Patent Document 1). . In other words, the joint has an insertion space that allows the end of the pipe to be inserted into the cylindrical main body, and is provided with confirmation means for confirming the insertion state of the pipe inserted into the insertion space. Yes. The confirmation means includes a cylindrical collar fitted into a through-hole formed in the main body so as to communicate with the insertion space, and a shaft fitted into the collar. The inner end of the shaft is provided with an inclined surface so as to face the end of the pipe inserted into the insertion space, and the shaft is disposed so that the inner end protrudes into the insertion space. . Then, the end of the pipe inserted into the insertion space interferes with the inclined surface to move the shaft outward, and the outer end of the shaft projects beyond the outer peripheral surface of the main body. .

Furthermore, a large-diameter portion is formed in the intermediate portion of the shaft, and a step surface that engages with the inner end surface of the large-diameter portion is formed on the inner peripheral surface of the through hole. Further, a step surface that engages with the outer end surface of the large-diameter portion of the shaft is formed on the inner peripheral surface of the collar. The shaft is configured to be movable between both step surfaces.
JP 2002-89759 A (second page and FIG. 2)

  However, in the confirmation means described in Patent Document 1, the outer peripheral surface of the collar is formed flat, and the inner peripheral surface of the through hole provided in the main body is also formed flat. On the other hand, it is slippery. Therefore, after manufacturing the joint by attaching the collar to the through-hole of the main body and before using the joint, the collar falls out of the through-hole of the main body due to vibration during transportation, etc., and drops (detaches) and is lost. There was a risk of doing so. Furthermore, after the joint is assembled in a water supply / hot water supply piping system, the collar may slide out of the through hole and fall due to an impact such as a water hammer (water hammer) caused by water flowing in the pipe material.

  Therefore, an object of the present invention is to provide a joint capable of restricting the confirmation means from being detached from the joint.

  In order to achieve the above object, the joint according to the first aspect of the present invention is to form a tube insertion space for inserting and connecting an end portion of a tube material to a tubular joint body, and to insert the tube. In the joint provided with a confirmation means for confirming an insertion state of the pipe material by a pipe material inserted into the pipe insertion space in the through hole that communicates with the space, the confirmation means includes a cylindrical collar member And a shaft member fitted into the collar member, and a confirmation means is engaged with the joint body by a concave-convex relationship between the outer peripheral portion of the collar member and the through-hole of the joint body, and the disengagement restriction The end of the pipe material interferes with the shaft member and protrudes by inserting the pipe material into the pipe insertion space, so that the insertion of the pipe material can be confirmed. It is.

  According to a second aspect of the present invention, there is provided the joint according to the first aspect, wherein the shaft member is within a certain range in the collar member due to the uneven relationship between the inner peripheral portion of the collar member and the outer peripheral portion of the shaft member. While being configured to be movable, it is characterized in that it is retained and retained.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the collar member is divided into a plurality by a notch extending in the axial direction on the inner end side when mounted in the through hole. It is characterized in that it can be expanded and contracted.

According to the present invention, the following effects can be exhibited.
In the joint according to the first aspect of the present invention, the confirmation means is constituted by the cylindrical collar member and the shaft member fitted into the collar member, and the outer periphery of the collar member and the joint body are penetrated. The confirmation means is configured to be engaged with the joint main body by the uneven relationship between the holes. Accordingly, it is possible to restrict the confirmation means from being detached from the joint. And the insertion state of a pipe material can be confirmed by the confirmation means by the end part of a pipe material interfering with a shaft member by the insertion of the pipe material to the said tube insertion space, and projecting.

  In the joint according to the second aspect of the present invention, the shaft member is configured to be movable within a certain range in the collar member by an uneven relationship between the inner peripheral portion of the collar member and the outer peripheral portion of the shaft member, and is prevented from coming off. Is retained. Therefore, in addition to the effect of the invention according to claim 1, it is possible to prevent the shaft member from falling off from the collar member before assembling the confirmation means comprising the collar member and the shaft member to the joint body, and the shaft member with respect to the collar member. Can be confirmed in advance.

  In the joint according to the third aspect of the present invention, the collar member is divided into a plurality of cuts extending in the axial direction on the inner end side when the collar member is mounted in the through hole, and is configured to be able to expand and contract. For this reason, in addition to the effect of the invention according to claim 1 or 2, when the shaft member is inserted from the inner end side of the collar member, the inner end side of the collar member is expanded, and the shaft member is inserted into the collar member. When finished, the inner end side of the collar member is reduced in diameter so that the shaft member can be easily inserted into the collar member. Moreover, when inserting the confirmation means into the through hole, the inner end side of the collar member is reduced in diameter by moving the shaft member in the collar member to the outer end side. Can be easily inserted.

(First embodiment)
Hereinafter, the first embodiment of the joint of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 3 and FIG. 4, the joint 10 is configured so that a pipe material 11 such as a resin pipe can be connected, and a substantially cylindrical joint body 13 having a cylindrical inner cylinder 12 is separated from one part. It is mainly composed of a pressing ring 14 as a tightening member having an annular shape, a washer 15 having an annular shape, and a pressing wheel 16 made of a nut. The joint body 13, the inner cylinder 12, the pressing ring 14, the washer 15, and the pressing wheel 16 are each formed of a metal material such as an alloy (brass, bronze, etc.). The tube material 11 is formed in a cylindrical shape from a synthetic resin material such as polyolefin (crosslinked polyethylene, polybutene, etc.).

  A first male screw portion 17 is threaded on the outer peripheral surface of the base end portion (left end portion in FIG. 4) of the joint body 13 so that it can be screwed into a pipe body such as a water pipe (not shown). Further, an abutment surface 18 is provided in an annular shape on the proximal inner peripheral surface of the joint body 13 so as to be orthogonal to the axis of the joint body 13. In the joint body 13, an introduction path 19 through which transport liquid can flow is formed on the base end side (left end side in FIG. 4) with respect to the contact surface 18 as a boundary. The first female threaded portion 20 is also threaded on the distal end side (the right end side in FIG. 4). The first female threaded portion 20 is formed so that a second male threaded portion 21 screwed into the base end portion of the inner cylinder 12 formed separately from the joint body 13 can be screwed together.

  A first tapered surface 22 having a diameter reduced toward the distal end of the inner cylinder 12 is formed on the outer peripheral edge of the inner cylinder 12, and an annular groove 23 is formed on the outer peripheral surface of the proximal end side of the first tapered surface 22. It is recessed. Four seal rings 24 having a circular cross section made of a rubber material are fitted into the annular groove 23. The thickness of the seal ring 24 is set to be the same as the depth of the annular groove 23, and the outer diameter of the seal ring 24 is set to be the same as the outer diameter of the inner cylinder 12. The outer peripheral surface of the inner cylinder 12 extends spirally along the circumferential direction from the proximal end of the inner cylinder 12 to the annular groove 23 and continues to the annular groove 23, and further spirals from the annular groove 23 to the first tapered surface 22. A concave groove 25 extending in the direction is formed. That is, the concave groove 25 is formed so as to extend from the distal end to the proximal end of the inner cylinder 12 across the seal ring 24 fitted in the annular groove 23.

  Between the inner peripheral surface on the distal end side of the joint main body 13 and the outer peripheral surface of the inner cylinder 12, an annular pipe insertion space 26 for inserting the pipe material 11 into the joint main body 13 is formed. An annular reduced diameter portion 27 is formed in the inner back portion of the tube insertion space 26, and an O-ring 28 made of a rubber material is fitted into the reduced diameter portion 27. A third male thread portion 29 as an external thread is threaded on the outer peripheral surface on the distal end side of the joint body 13, and a second tapered surface whose diameter increases from the inside of the joint body 13 toward the distal end side on the inner peripheral surface. 30 is formed.

  A through hole 31 having a substantially circular plane is provided at a substantially central portion of the joint body 13. A female screw 32 is formed on the inner end side of the through hole 31, and the outer end side is formed on the outer end side from the inner end side. The diameter-enlarging recess 33 is expanded. As shown in FIG. 2A, a collar member 34 formed of a synthetic resin material such as polyacetal (POM) as an engineering plastic is fitted in the through hole 31. As shown in FIG. 1 (a), the collar member 34 is formed in a substantially cylindrical shape, and a collar portion 35 having an enlarged diameter is provided on the outer end side when the collar member 34 is mounted in the through hole 31. In addition, the inner end side is equally divided into four divided pieces 37 by an incision 36 extending in the axial direction, and is configured to be able to expand and contract. Engagement protrusions 38 as two protrusions extending in the circumferential direction are provided on the outer peripheral surface of each divided piece 37, and are engaged with a thread groove 32 a as a recess of the female screw 32 by a concave-convex relationship to form a color member. 34 is configured to be restricted from being detached from the joint body 13. Further, an engaging claw 39 is formed inwardly on the inner end portion of the inner peripheral surface of each divided piece 37, and a moving recess 40 is formed on the outer end side from the engaging claw 39.

  As shown in FIGS. 2B and 1B, a shaft member 41 having a substantially cylindrical shape formed of polyacetal or the like is fitted in the collar member 34. A taper portion 42 having a diameter reduced toward the inner end is provided at the inner end portion of the shaft member 41, and the shaft member 41 moves to the outer end side by a pressing force due to interference of the end portion of the tube material 11 inserted into the tube insertion space 26. It is supposed to be. Further, an annular projection 43 as an annular convex portion is provided on the outer peripheral surface of the intermediate portion of the shaft member 41, and when the shaft member 41 is fitted into the collar member 34, the movement recess 40 of the collar member 34 is provided. Are engaged by the concavo-convex relationship.

  As shown by the solid line in FIG. 1 (c), the position of the annular protrusion 43 of the shaft member 41 engaged with the engaging claw 39 of the collar member 34 and the shaft member as shown by the two-dot chain line in FIG. The annular protrusion 43 of the collar 41 is configured to be able to take a position where the annular protrusion 43 engages with the outer end portion of the moving recess 40 of the collar member 34. That is, the shaft member 41 is configured to be movable in the direction perpendicular to the axis of the joint body 13 in the through hole 31, and the inner end of the shaft member 41 protrudes from the through hole 31 into the pipe insertion space 26 in the joint body 13. The position can be displaced between (the position in FIG. 2A) and the position where the outer end protrudes outward from the through hole 31 (the position in FIG. 2B).

  As shown in FIGS. 3 and 4, a second female screw portion 44 as an internal screw that can be screwed into the third male screw portion 29 of the joint body 13 is threaded on the inner peripheral surface of the push ring 16. . In addition, a locking surface 45 is formed in an annular shape so as to be orthogonal to the axis of the push ring 16 at the inner back portion from the second female screw portion 44. Further, an annular recess 46 is provided on the inner peripheral surface of the push ring 16, and the annular recess 46 has a cross-sectional shape made of a rubber material for preventing the tube material 11 from coming out of the joint 10. A prevention ring 47 is fitted.

  The press ring 14 is disposed between the joint body 13 and the push ring 16. The press ring 14 is formed with a slit 48 extending in the axial direction on the press ring 14. While moving forward in the inner part of 13, the diameter can be reduced. The outer peripheral surface of the pressing ring 14 is a third tapered surface 49 corresponding to the second tapered surface 30 of the joint body 13. On the other hand, on the inner peripheral surface of the pressing ring 14, an uneven surface 50 is formed over the entire surface to prevent the pipe member 11 from coming off into the joint body 13. The washer 15 is interposed between the pressing ring 14 and the locking surface 45 of the pressing wheel 16.

  Now, as shown in FIG. 4, first, the pressing ring 14 and the washer 15 are disposed on the distal end side of the joint body 13, and the second female thread portion 44 of the push ring 16 is screwed into the third male thread portion 29 of the joint body 13. . In this state, as shown in FIG. 5, the end portion of the tube material 11 is inserted into the tube insertion space 26 in the joint body 13 through the push ring 16, and the end portion of the tube material 11 is externally fitted to the inner cylinder 12. To do. When the end portion of the tube material 11 is inserted into the tube insertion space 26, the end portion of the tube material 11 interferes with the tapered portion 42 of the inner end portion of the shaft member 41, and the shaft member 41 is moved toward the outer end side. . Accordingly, the outer end portion of the shaft member 41 is displaced from a state flush with the outer peripheral surface of the joint body 13 to a state protruding outward. As a result, the insertion depth of the end portion of the tube material 11 into the tube insertion space 26 can be visually confirmed.

  At this time, the confirmation means constituted by the collar member 34 and the shaft member 41 inserted into the collar member 34 is such that the engagement protrusion 38 on the outer peripheral surface of the collar member 34 has an uneven relationship with the thread groove 32a of the female screw 32. Since it is engaged, the confirmation means is restricted from being detached from the joint body 13. In addition, the shaft member 41 has a limited range in which the annular protrusion 43 on the outer peripheral portion thereof can move to the moving concave portion 40 on the inner peripheral portion of the collar member 34 due to the concavo-convex relationship, and is prevented from falling into the collar member 34. In addition, the shaft member 41 can be prevented from falling off from the collar member 34 before the confirmation means is assembled to the joint body 13, and the movement of the shaft member 41 in the collar member 34 can be tested in advance.

  Thereafter, as shown in FIG. 5, the second female screw portion 44 of the push ring 16 is further screwed into the third male screw portion 29 of the joint body 13 by hand. In this manual operation, since the push ring 16 is not screwed into a predetermined position of the joint main body 13, the pressure ring 14 does not reliably reduce the diameter, and the inner peripheral surface of the tube material 11 is pressed against the outer peripheral surface of the inner cylinder 12. It is not done. Therefore, each seal ring 24 is not elastically deformed and is not in surface contact with the inner surface of the annular groove 23 and the inner peripheral surface of the tube material 11. At this time, a gap extending across the seal ring 24 from the front end to the base end of the inner cylinder 12 is formed between the inner peripheral surface of the tube material 11 and the outer peripheral surface of the inner cylinder 12 by the concave groove 25.

  When the water pressure test is performed in this state, water enters directly from the first tapered surface 22 of the inner cylinder 12 into the concave groove 25 on the distal end side and further into the annular groove 23, and a predetermined water pressure is directly applied to each seal ring 24. Acts and elastically deforms due to the water pressure. Then, the sealing function between the inner peripheral surface of the pipe material 11 and the outer peripheral surface of the inner cylinder 12 is lowered, and water passes between the seal rings 24 and flows through the concave groove 25 on the proximal end side, and It reaches between the end face and the O-ring 28. Furthermore, since the water leaks out of the joint 10 from a connection portion between the joint main body 13 and the push ring 16, it is confirmed that the tightening of the tube material 11 by the press ring 14 is insufficient.

  Next, as shown in FIG. 6, when the push ring 16 is screwed to a predetermined position of the joint body 13 using a tool such as a spanner, the locking surface 45 of the push ring 16 moves to the distal end side of the joint body 13. Therefore, the pressing ring 14 is pushed into the inner back portion of the joint body 13 via the washer 15. At this time, since the end portion of the tube material 11 is pressed in the entering direction, the end surface of the tube material 11 is pressed against the O-ring 28, and the joint body 13, the inner cylinder 12, and the tube material 11 are sealed.

  Further, the third tapered surface 49 of the pressing ring 14 is engaged with the second tapered surface 30 of the joint body 13, the pressing ring 14 is reduced in diameter, and the uneven surface 50 on the inner peripheral surface of the pressing ring 14 is the outer periphery of the tube material 11. The pipe 11 is prevented from coming out of the pressing ring 14 by being pressed against the surface and biting in. As a result, the tube material 11 is firmly retained in the joint body 13 by the pressing ring 14 positioned between the joint body 13 and the push ring 16.

  When a water pressure test is performed in this state, water slightly enters the concave groove 25 from the first tapered surface 22 of the inner cylinder 12, but each seal ring 24 in an elastically deformed state is not elastically deformed by the water pressure, and the pipe material 11. The inner peripheral surface of the inner cylinder 12 and the outer peripheral surface of the inner cylinder 12 are surely sealed to prevent water from entering from the annular groove 23 to the tip. Even if the water is immersed before the seal ring 24, the joint body 13, the inner cylinder 12 and the tube material 11 are sealed by the O-ring 28. As a result, it is confirmed that water does not leak out of the joint 10 from the connection portion between the joint body 13 and the push ring 16 and the tube 11 is sufficiently tightened by the pressing ring 14.

The effects exhibited by the first embodiment described in detail above will be collectively described below.
-In the joint 10 of 1st Embodiment, the confirmation means is comprised by the cylindrical collar member 34 and the shaft member 41 inserted by the collar member 34. As shown in FIG. The engagement protrusion 38 on the outer peripheral portion of the collar member 34 and the thread groove 32a of the through hole 31 of the joint body 13 are engaged by an uneven relationship. Accordingly, it is possible to restrict the confirmation means from being detached from the joint body 13. As a result, after the confirmation means is mounted on the joint body 13 and the joint 10 is manufactured, the confirmation means comes out of the through hole 31 of the joint body 13 by vibration during transportation, for example, until the joint 10 is used. There is no risk of falling and losing. In addition, after the joint 10 is assembled in a water supply / hot water supply piping system, there is no possibility that the checking means slides out of the through hole 31 and falls due to the impact of water hammer or the like caused by the water flowing in the pipe 11.

  And the insertion of the pipe material 11 can be easily confirmed by the end part of the pipe material 11 interfering with the shaft member 41 by the insertion of the pipe material 11 into the pipe insertion space 26 and the shaft member 41 protruding.

  In addition, the shaft member 41 is configured to be movable within the range of the movement recess 40 by an uneven relationship between the movement recess 40 on the inner periphery of the collar member 34 and the annular protrusion 43 on the outer periphery of the shaft member 41. The retaining claw 39 holds the retaining member. Accordingly, it is possible to prevent the shaft member 41 from falling off the collar member 34 before assembling the confirmation means including the collar member 34 and the shaft member 41 to the joint body 13 and to keep the shaft member 41 within a certain range with respect to the collar member 34. Can be confirmed in advance.

  Further, the collar member 34 is divided into four divided pieces 37 by an incision 36 extending in the axial direction on the inner end side when the collar member 34 is mounted in the through hole 31, and is configured to be able to expand and contract. For this reason, when the shaft member 41 is inserted from the inner end side of the collar member 34, the inner end side of the divided piece 37 expands, and when the shaft member 41 has been inserted into the collar member 34, the inner end side of the divided piece 37 contracts. The shaft member 41 can be easily inserted into the collar member 34. Moreover, when inserting the confirmation means into the through hole 31, the inner end side of the split piece 37 is reduced in diameter by moving the shaft member 41 in the collar member 34 to the outer end side. The confirmation means can be easily inserted into 31.

  In addition, a concave groove 25 that is continuous from the distal end of the inner cylinder 12 to the annular groove 23 and continues from the annular groove 23 to the proximal end of the inner cylinder 12 is formed. Therefore, if the push ring 16 is not screwed to the predetermined position of the joint body 13 and the water pressure test is performed in a state where the seal ring 24 has low pressure resistance, water pressure is applied from the concave groove 25 to the seal ring 24 in the annular groove 23. The seal ring 24 is elastically deformed by acting directly. Therefore, the case where water leaks from between the inner cylinder 12 and the pipe material 11 and water leaks out of the joint 10 from the concave groove 25 and the push ring 16 is not screwed to the predetermined position of the joint body 13 is reliably detected. can do.

-By separating the inner cylinder 12 from the joint body 13, the processing of the annular groove 23 can be easily performed, and the seal ring 24 can be easily attached to the annular groove 23.
(Second Embodiment)
Next, a second embodiment of the joint of the present invention will be described with reference to the drawings. In the second embodiment, the structure for preventing the pipe 11 from coming off is mainly different from that in the first embodiment, and the description will focus on that portion. In the second embodiment, the same members as those in the first embodiment will be described with the same member numbers.

  FIG. 7 is a half vertical sectional view showing the joint 10 of the second embodiment. As shown in the figure, the joint 10 includes a joint body 13 having a substantially cylindrical shape, and a first male screw portion 17 is provided on the outer periphery of the base end (left end in FIG. 7), and the distal end (right end in FIG. 7). A female screw part 51 is provided on the inner periphery of the screw ring, and a male screw part 52 of the push ring 16 is screwed and connected.

  In the joint body 13, a cylindrical inner cylinder 12 is provided that extends from the axial intermediate portion toward the distal end side of the joint body 13. In the inner cylinder 12, a second male screw portion 21 provided on the outer periphery of the base end is screwed to a first female screw portion 20 provided on the inner periphery of the joint body 13 on the base end side in the axial direction of the joint body 13. It is integrated. An O-ring 28 is interposed between the inner cylinder 12 and the joint body 13, thereby sealing between the two. An annular tube insertion space 26 is formed between the outer periphery of the inner cylinder 12 and the inner periphery of the joint body 13 and the push ring 16, and the end of the tube 11 is connected to the tube as shown in FIG. It is inserted into the insertion space 26. When the tube material 11 is inserted into the tube insertion space 26, the inner cylinder 12 is fitted into the tube material 11.

  Two lock rings 53 for preventing the pipe member 11 from coming off are disposed on the inner peripheral portion on the distal end side of the joint body 13. These lock rings 53 are arranged side by side along the axial direction of the joint body 13 by spacers 54 interposed between the lock rings 53. The lock ring 53 does not come out of the joint body 13 when the pusher wheel 16 is screwed into the tip of the joint body 13. Further, each lock ring 53 has a plurality of claws 53a extending radially inward. Then, when a pulling-direction force is applied to the tube material 11 inserted into the tube insertion space 26, the claws 53 a of both lock rings 53 bite into the outer peripheral surface of the tube material 11 and become immovable within the joint 10. As a result, the pipe material 11 is prevented from coming off from the joint 10.

  A through hole 31 having a substantially circular plane is provided in a substantially central portion of the joint body 13, and a confirmation for enabling the pipe 11 to be inserted into the pipe insertion space 26 is confirmed in the through hole 31. Means are provided. The through-hole 31 is formed with a female screw 32 on the inner end side, and has a diameter-enlarged recess 33 whose diameter is larger than that on the inner end side. The confirmation means includes a collar member 34 fitted into the through hole 31 and a shaft member 41 fitted into the collar member 34. The collar member 34 is provided with a flange 35 having an enlarged diameter on the outer end side, fitted into the enlarged diameter concave portion 33 of the through hole 31, and 4 on the inner end side by a notch 36 extending in the axial direction thereof. It is equally divided into two divided pieces 37 and can be enlarged or reduced. On the outer peripheral surface of each divided piece 37, two engaging protrusions 38 extending in the circumferential direction are provided, and the collar member 34 is restricted from being detached from the joint body 13 by engaging with the thread groove 32 a of the female screw 32 due to an uneven relationship. It is configured to be. Further, an engaging claw 39 is formed inwardly on the inner end portion of the inner peripheral surface of each divided piece 37, and a moving recess 40 is formed on the outer end side from the engaging claw 39.

  A shaft member 41 is fitted into the collar member 34, and a tapered portion 42 having a diameter reduced toward the inner end is provided at the inner end portion of the shaft member 41, and interference of the tube material 11 inserted into the tube insertion space 26. The shaft member 41 is moved to the outer end side by the pressing force. Further, an annular protrusion 43 having an annular shape is provided on the outer peripheral surface of the intermediate portion of the shaft member 41. When the shaft member 41 is fitted into the collar member 34, the movement recess 40 of the collar member 34 has an uneven relationship. It is designed to be engaged.

  As shown in FIG. 7, the outer end of the shaft member 41 is flush with the outer peripheral surface of the joint body 13 when the pipe 11 is not connected to the joint body 13. On the other hand, as shown in FIG. 8, in a state where the tube material 11 is inserted to the inner depth of the tube insertion space 26, the end portion of the tube material 11 is pushed up by interfering with the taper portion 42 of the shaft member 41. The outer end of the shaft member 41 protrudes outward from the through hole 31 by moving 41 toward the radially outer side of the joint body 13.

  An annular groove 23 extending in an annular shape along the circumferential direction is provided on the outer peripheral surface of the inner cylinder 12 side by side at regular intervals in the axial direction. A seal ring 24 for sealing between the tube material 11 inserted into the tube insertion space 26 and the inner cylinder 12 fitted in the tube material 11 is mounted in the annular grooves 23. A projecting portion 24a that projects radially outward from the outer peripheral surface of the inner cylinder 12 is formed on the outer peripheral surface of the proximal end of the seal ring 24, and the outer peripheral surface of the inner cylinder 12 is located behind the projecting portion 24a. A flat portion 24b that is substantially flush is formed. Between the protrusion 24a and the flat portion 24b of the seal ring 24, a recess 24c that is recessed inward in the radial direction from the outer peripheral surface of the inner cylinder 12 is provided. The inner diameter of the seal ring 24 is set to be, for example, 1-2 mm smaller than the diameter of the inner bottom surface 23a of the annular groove 23. When the seal ring 24 is attached to the annular groove 23, the seal ring 24 is fitted in an expanded state. The elastic groove (restoring force) is in close contact with the annular groove 23. The seal ring 24 is configured to be rotatable in the annular groove 23 so that the seal ring 24 is not damaged when the tube material 11 inserted into the tube insertion space 26 rotates.

  As shown in FIG. 7, first, a pair of lock rings 53 are disposed on the distal end side of the joint body 13 with a spacer 54 interposed therebetween, and the male threaded portion 52 of the push ring 16 is screwed onto the female threaded portion 51 of the joint body 13. Match. In this state, as shown in FIG. 8, the end portion of the tube material 11 is inserted into the tube insertion space 26 in the joint body 13 through the push ring 16, and the end portion of the tube material 11 is externally fitted to the inner cylinder 12. To do. When the end portion of the tube material 11 is inserted into the tube insertion space 26, the end portion of the tube material 11 interferes and presses against the tapered portion 42 of the inner end portion of the shaft member 41, and the shaft member 41 moves toward the outer end side. Is done. Accordingly, the outer end portion of the shaft member 41 is displaced from a state flush with the outer peripheral surface of the joint body 13 to a state protruding outward. As a result, the insertion depth of the end portion of the tube material 11 into the tube insertion space 26 can be visually confirmed.

  At this time, since the engagement protrusions 38 on the outer peripheral surface of the collar member 34 are engaged with the thread groove 32a of the female screw 32 by the concave-convex relationship, the confirmation means is restricted from being separated from the joint body 13. . Moreover, the annular protrusion 43 on the outer peripheral portion of the shaft member 41 can move to the moving concave portion 40 on the inner peripheral portion of the collar member 34 due to the concavo-convex relationship, and at the same time, the shaft member 41 is prevented from coming off into the collar member 34 by the engaging claw 39. Yes. In addition, the shaft member 41 can be prevented from falling off from the collar member 34 before the confirmation means is assembled to the joint body 13, and the movement of the shaft member 41 in the collar member 34 can be tested in advance.

  Further, by arranging two seal rings 24 side by side along the axial direction of the joint body 13, it is possible to double seal between the inner cylinder 12 and the pipe material 11, and the joint 10 has high sealing performance. It can be demonstrated. Furthermore, the concave strip 24c provided in the intermediate portion of the outer peripheral surface of the seal ring 24 effectively functions as a relief of the projecting portion 24a that is pressed radially inward by the tube material 11 and compressively deforms. Therefore, the protruding portion 24a can be easily compressed and deformed when pressed radially inward by the tube material 11. Therefore, the ease of inserting the pipe material 11 into the pipe insertion space 26 can be improved.

It should be noted that both the above embodiments can be modified as follows.
A male screw may be formed on the outer peripheral surface of the collar member 34, the thread may be a convex portion, and may be configured to engage with a thread groove 32a as a concave portion of the female screw 32 of the joint body 13.

It is possible to make the engagement protrusion 38 of the collar member 34 one or a short protrusion.
-It can replace with the internal thread 32 of the coupling main body 13, and can also provide recessed parts, such as cross-sectional semicircle shape and cross-sectional arc shape.

The confirmation means can be provided at a plurality of locations on the peripheral surface of the joint body 13.
As the engineering plastic for forming the collar member 34 and the shaft member 41, polyamide (PA), polycarbonate (PC), polyphenylene ether (PPE), or the like can be used.

  -The number of cuts 36 in the color member 34 is set to two to make the divided pieces 37, the number of the cuts 36 is set to three and the divided pieces 37 are set to three, or the number of the cuts 36 is set to five or more. Thus, the number of divided pieces 37 can be increased to five or more. By increasing the number of the divided pieces 37, the division pieces 37 can be more easily expanded or reduced.

The joint body 13 and the inner cylinder 12 may be integrally formed so that the inner cylinder 12 cannot be separated from the joint body 13.
-As the pipe material 11, it is also possible to use metal pipes, such as brass and copper.

  In both embodiments, the joint 10 and the pipe of the water supply pipe are connected to circulate water as a liquid, but the joint 10 is connected to the pipe of the hot water pipe to supply hot water, floor heating, load Oil, ethylene glycol or the like may be circulated for heating.

Furthermore, the technical idea grasped from the embodiment will be described below.
A female screw is provided in the through hole of the joint body, and a concave portion is formed by the thread groove, and a convex portion is provided in the collar member, and the color member is formed by a concave-convex relationship between the collar member and the joint body. The joint according to any one of claims 1 to 3, wherein the joint body is configured to be restricted from being detached from the joint body. When comprised in this way, the detachment | leave regulation with a collar member and a coupling main body can be performed with a simple structure.

  The joint according to any one of claims 1 to 3, wherein the collar member and the shaft member constituting the confirmation unit are formed of engineering plastic. When comprised in this way, the intensity | strength and heat resistance of a collar member and a shaft member can be improved.

  The inner end portion of the shaft member has a taper portion, and the end portion of the pipe material is configured to project by interfering with the taper portion. The joint according to claim 1. When comprised in this way, the insertion state of a pipe material can be confirmed with a simple structure.

(A) is a perspective view which shows the collar member which comprises the confirmation means of the coupling in 1st Embodiment, (b) is a perspective view which shows a shaft member, (c) shows the state which inserted the shaft member in the collar member. FIG. (A) And (b) is sectional drawing which shows the effect | action of a confirmation means, (a) is an expanded sectional view which shows the state before inserting a pipe material in a pipe insertion space, (b) is inserting a pipe material in a pipe insertion space. The expanded sectional view which shows the state after having performed. The disassembled perspective view which shows a coupling. It is a figure which shows the effect | action of a joint, Comprising: The semi-longitudinal sectional view which shows the state before inserting a pipe material in pipe insertion space. It is a figure which shows the effect | action of a joint, Comprising: The half longitudinal cross-sectional view which shows the state after inserting a pipe material in pipe insertion space. It is a figure which shows the effect | action of a coupling | joint, Comprising: After inserting a pipe material in a pipe insertion space, it is a semi-longitudinal sectional view which shows a state when a push ring is further tightened. The half longitudinal cross-sectional view which shows the coupling of 2nd Embodiment. It is a figure which shows the effect | action of a joint, Comprising: The half longitudinal cross-sectional view which shows the state after inserting a pipe material in pipe insertion space.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Pipe material, 13 ... Joint main body, 26 ... Pipe insertion space, 31 ... Through-hole, 34 ... Collar member, 36 ... Cut, 37 ... Divided piece, 41 ... Shaft member.

Claims (3)

The tubular joint body has a tube insertion space for inserting and connecting the end portion of the pipe material, and a through hole communicating with the tube insertion space is provided. The through hole is inserted into the tube insertion space. In a joint provided with a confirmation means for confirming the insertion state of the pipe material by the pipe material,
The confirmation means includes a cylindrical collar member and a shaft member fitted into the collar member, and the confirmation means has an uneven relationship between the outer periphery of the collar member and the through hole of the joint body. It is configured to be engaged and disengaged with respect to the joint body, so that the insertion of the pipe material can be confirmed by inserting the pipe material into the pipe insertion space and projecting the end of the pipe material by interfering with the shaft member A joint characterized in that it is configured. The shaft member is configured to be movable within a certain range in the collar member by an uneven relationship between the inner peripheral portion of the collar member and the outer peripheral portion of the shaft member, and is held out. Item 10. The joint according to Item 1. The said collar member is divided | segmented into plurality by the notch which extends in an axial direction when the inner end side is mounted | worn in a through-hole, and is comprised so that expansion / contraction is possible. Fittings.

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