JP5800975B1 - Pipe fitting - Google Patents

Abstract

The present invention reliably notifies the operator of whether or not the connection work with the pipe has been completed even though it has a simple internal structure, and prevents an accidental external leakage of fluid due to insufficient pipe insertion or forgetting to insert. In a pipe joint provided with a pipe pull-out prevention member 1; an outer diameter taper surface 33A on the outer periphery and an outer diameter smaller than the outer diameter of the outer end of the taper surface. A ring body 33 that has a surface 33C, is pressed against the tip end surface 28 of the inserted pipe, and moves to the back; elastically deformable having a plurality of slits in the axial direction from the inner end 30A A cylindrical interior body 30 that is held inside the pipe joint, and the ring body moves to the back as the pipe is inserted, and the taper surface extends to the inner end of the petal piece. It is elastically deformed so that it expands, and the inner end of the petal piece whirls the surface of the ring body by the radial biasing force in the radial direction accompanying the elastic deformation of the petal piece. To occur. [Selection] Figure 6

Description

  The present invention relates to a pipe joint.

The present applicant has proposed the pipe joint shown in FIG. 14 in the past (see Patent Document 1).
That is, the joint main body 42 having the insertion cylinder portion 43 inserted into the end portion of the pipe 41 to be connected, and the end portion of the pipe 41 externally fitted to the insertion cylinder portion 43 (from FIG. 14A ( B)) A tightening ring 45 with a slit 51 for tightening with a resilient tightening force, and the diameter of the tightening ring 45 is increased against the resilient force of the tightening ring 45 Thus, the diameter-enlarging piece 46 sandwiched between the slits 51 is provided, and the diameter-enlarging piece 46 is released by coming into contact with the distal end portion of the pipe 41 inserted as shown by an arrow A. By this separation, as shown in FIG. 14B, the tightening ring 45 strongly tightens the pipe 41 in the radial inward direction by its elastic force, and the insertion tube portion 43 and the pipe 41 are strongly integrated. This is a configuration that exerts a function of preventing the withdrawal of the pipe.

  Since a clicking sound is generated when the diameter-expanding piece 46 is detached, the operator can confirm that the pipe 41 has been inserted to the normal depth. However, it is very difficult to visually check the small diameter-expanded piece 46 made of metal from the outside. In particular, even if the outer enclosure 47 is transparent, it is difficult to determine where the small metal-made enlarged diameter piece 46 exists in the internal space 48. It was difficult to find it by moving to a lower position (inside the body) of the body 47, and it was difficult to understand whether or not the pipe connection work was completed.

Japanese Patent No. 3405966

The pipe joint of the above-mentioned patent document 1 is a product that is highly trusted in the market because of its extremely high pull-out resistance and stability. However, the structure is somewhat complicated, and there is also a problem that the assembly of the tightening ring 45 and the enlarged diameter piece 46, which has a strong elasticity, is dangerous and the work efficiency is low. There are also voices in the market saying that cheap fittings that are easy to do are sufficient.
Therefore, when developing such a new pipe joint, depending on the internal mechanism, it is often difficult for the operator to know whether or not the pipe tip is sufficiently inserted into the pipe joint (no sound is generated). In particular, the inventor has noticed. In particular, the level of skill and ability of workers has recently become extremely variable, and it may be judged that the connection has been completed without inserting the pipe to the normal depth, and subsequent fluid leakage may occur. It is growing.

  Therefore, the present invention makes it possible to reliably notify the operator whether or not the connection work with the pipe has been completed even though it has a simple internal structure. The purpose is to prevent external leakage accidents.

  The present invention relates to a pipe joint provided with a pipe drawing prevention member; on the outer periphery thereof, an inner diameter-reduced tapered surface, and a coated surface having an outer diameter smaller than the outer diameter of the outer end of the tapered surface A ring body that is pressed in contact with the distal end surface of the pipe that is inserted and moves to the back; and an elasticity that is formed by forming a plurality of slits in the axial direction from the inner end A cylindrical interior body having a plurality of deformable petal pieces and held inside the pipe joint; as the pipe P is inserted, the ring body moves to the back, and the tapered surface is The ring-shaped inner body is elastically deformed so as to expand the inner end of the petal piece, and the ring body is covered by the elastic biasing force in the radial inward direction accompanying the elastic deformation of the petal piece. The pipe is configured such that the inner end of the petal piece is rolled and a connection completion notification sound is generated. Hand is.

The ring body has a tapered surface with chamfered corners on the inner peripheral back side, and when the pipe is inserted, the seal material is pressed to prevent the seal material from being damaged by the edge of the end surface of the pipe. It is equipped with a pipe guiding function that guides and guides.
In addition, when the pipe is not inserted, the petal piece of the cylindrical interior body is free from external force that causes elastic deformation.
In addition, the tubular member surrounding the ring body is transparent at the back position where the ring body is hit by the petal piece and generates the connection completion notification sound. or the outer peripheral surface has a chromatic for alerting, at a the deeper position, that is visibly constituting the chromatic for the alert from the outside.

According to the present invention, simple components are sufficient, and the components can be easily assembled. The ring body is moved lightly and smoothly to the back, and an impact sound (and vibration) is generated from the inside of the pipe joint. The pipe operator is surely inserted to the normal depth (pipe connection complete or construction) (Also called completion). Thereby, subsequent fluid external leakage can be prevented.

It is sectional drawing which shows one Embodiment of this invention and shows a pipe uninserted state. It is one Embodiment of this invention, Comprising: It is sectional drawing which shows a pipe connection completion state. It is a front view of main components. It is an EE cross-section end view of FIG. It is an action (operation) explanatory view. It is an action (operation) explanatory view. It is sectional drawing which shows a reference example . It is an effect | action (operation | movement) explanatory drawing of a reference example . It is sectional drawing which shows a reference example . It is an effect | action (operation | movement) explanatory drawing of a reference example . It is an effect | action (operation | movement) explanatory drawing of a reference example . It is a cross-sectional explanatory drawing of the elastic C ring of a reference example . It is a figure which shows an example of a pipe drawing-out prevention member. It is sectional drawing which shows a prior art example.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
1 and 2 show an embodiment of the present invention. The pipe joint and pipe P according to the present invention are used for water supply, hot water supply, and other various fluids. Reference numeral 2 denotes a joint body having an insertion cylinder portion 3 to be inserted into an end portion of the pipe P. In addition, two seal grooves (in the illustrated example) are recessed in the insertion tube portion 3, and two seal materials (O-rings) 4 and 5 are fitted therein. This pipe joint includes a simple pipe pull-out preventing member 1.
In FIG. 1, the joint body 2 integrally includes a male screw 6, a hexagonal portion 7 for hanging a work tool, a medium diameter cylindrical portion 8, and a small outer flange portion 9. The insertion cylinder part 3 is continuously provided in a protruding shape with one end face thereof as a stepped surface 10.

Reference numeral 11 denotes a transparent cylindrical member, which is attached to the middle-diameter cylindrical portion 8 of the joint body 2 in a close fitting manner, and is secured to the outer flange portion 9 in a locking manner. The transparent cylindrical member 11 has a male threaded portion 12 on the distal end side (right end portion in FIG. 1 ), and a cap nut 13 is screwed thereon.
Further, in the transparent cylindrical member 11, the male screw portion 12 is provided on the distal end side in the axial center direction, and the proximal end side in the axial center direction has a fitting portion 14, and the fitting portion 14 is a medium diameter cylinder. Part 8 is attached.
Then, a large-diameter fitting hole 16 and a tapered surface 29 (having a reduced diameter toward the back) are formed from the tip opening of the hole inside the transparent cylindrical member 11, and this fitting hole 16 A non-transparent packaged inner body 30 is fitted into the inner wall.

Further, the transparent cylindrical member 11 has a mounting hole portion 18 to be fitted into the medium diameter cylindrical portion 8.
The pipe pull-out prevention member 1 will be described below. As illustrated in FIGS. 1, 2, 2, 5, 6, and 13, the pipe pull-out prevention member 1 is made of a thin metal plate material, and is an annular flat plate that is radially formed from the inner peripheral edge. A large number of slits 19 are formed, and a large number of locking tooth pieces 21 are provided. The pipe pull-out prevention member 1 is attached between the distal end surface of the transparent cylindrical member 11 and the inner surface of the inner flange portion of the cap nut 13. In the free state, the tooth piece 21 is inclined inward of the pipe joint. Then, after the pipe P is inserted in the direction of the arrow A, when a pulling force acts on the pipe P, the tooth piece 21 bites into the outer peripheral surface of the pipe P and is locked. It includes a tooth piece 21 and is provided in the pipe joint in a plane orthogonal to the axial center, and is inclined inward in the pipe joint as the pipe P is inserted (in the direction of arrow A). It is also desirable to make a sliding contact (contact) and to engage with the outer peripheral surface of the pipe P (not shown).
In order to allow the locking tooth piece 21 to be elastically deformed inward in the pipe joint with insertion of the pipe P (giving relief), an inner peripheral corner portion on the distal end side of the cylindrical interior body 30 Further, a chamfered (inclined) cutout 22 is formed.

Reference numeral 33 denotes a ring body that is held by the outer peripheral surface near the tip of the insertion tube portion 3 and the inner end edge of the pipe pull-out prevention member 1 in a state where the pipe is not inserted. In the surface, it is a one-sided type having a taper surface 33A with an inner diameter reduction and a surface 33C having a smaller outer diameter than the outer dimension of the outer end of the taper surface 33A. The ring body 33 is in contact with the distal end surface 28 of the pipe P to be inserted, and is shown in FIGS. 5 (A) to 5 (B), and FIG. 6 (A) to FIG. 6 (B) (FIG. 2). ) Move to the back as shown in order.
As shown in FIGS. 1 to 6, the tubular interior body 30 has a plurality of slits 30 </ b> B (six in FIG. 3) in the axial direction from the inner end 30 </ b> A, thereby allowing elastic deformation of the petals. A piece 30C is formed. That is, in FIG. 3, six petal pieces 30C are formed, and the cross-sectional shape of the petal pieces 30C is an arc shape. In addition, at the tip of the petal piece 30C, there is a continuous protruding convex portion 31 bent in the radial inward direction as an inner collar shape.

As shown in the order of FIG. 1 → FIG. 5 (A) → FIG. 5 (B) → FIG. 6 (A), the ring body is pressed while being pushed by the pipe tip surface 28 as the pipe P is inserted (see arrow A). In the middle of the movement, the taper surface 33A expands the inner end of the petal piece 30C of the tubular interior body 30 as shown by the arrow F in FIG. 6A. To be elastically deformed. Specifically, the petals 30C are elastically deformed in an expanded shape by the taper surface 33A while being in sliding contact with the whirling convex portion 31 at the inner end of the petal piece 30C. As shown in FIG. 6 (B), the inward end 30A of the petal piece 30C--the whirling convex portion 31 --- is caused by the elastic urging force in the radial direction accompanying the elastic deformation of the petal piece 30C. The surface 33C of the ring body 33 is strongly struck to generate a loud sound such as “buzz” or “bang”, that is, a connection completion notification sound H. When the operator listens to the notification sound H with his / her ear, the pipe P is inserted to the inside of the tube insertion to the proper depth, and the normal work completion can be confirmed (FIG. 6B). Moreover, you can feel intense vibrations with your hands.
In FIG. 6B, an arrow G indicates an instantaneous movement in the closing leg direction in which the petal piece 30C elastically deformed elastically into an arcuate shape (see FIG. 6A) is restored by its elastic urging force. An arrow K in FIG. 6B indicates an instantaneous vector in which the whirling convex portion 31 whirls the surface to be scrubbed 33C.

By the way, in the pipe non-insertion state shown in FIG. 1, the petal piece 30C of the cylindrical interior body 30 is kept free from any external force that causes elastic deformation. Therefore, when the pipe joint according to the present invention is stored in a warehouse, a factory, a construction site, etc. for a long time, or is unused for a long-distance transportation and a long time elapses, the tubular inner body 30 Even if it is made of plastic, there is an advantage that permanent deformation due to creep does not occur.
Moreover, the ring body 33 shown in FIGS. 1-6 has the taper surface 33D which chamfered the inner peripheral back side corner | angular part. In order to prevent the sealing materials 4 and 5 from being damaged by the edge 28A of the front end surface 28 of the pipe P when the pipe P is inserted, a pipe guiding function for pressing and guiding the sealing materials 4 and 5 is provided. The ring body 33 is exhibited by the tapered surface 33D.

  The ring body 33 surrounds the ring body 33 at a back position (see FIGS. 6B and 6C) where the ring body 33 is hit by the petal piece 30C of the cylindrical interior body 30 and generates the connection completion notification sound H. The cylindrical member 11 is transparent, and the ring body 33 has an entire or outer peripheral surface 33Z having a chromatic color for alerting, and is located at the above-mentioned back position (see FIGS. 6B and 6C). However, the chromatic color for alerting can be visually observed from the outside (FIG. 6C). Since the cylindrical interior body 30 is opaque, the ring body 33 is hidden in FIG. 5A, but the ring body 33 can be reliably seen in FIG. 6C. Moreover, the ring body 33 has a closed annular shape, and as shown in FIG. 6C, the ring body 33 can be surely viewed from any radial direction of 360 °.

Next, a reference example will be described. In FIGS. 7 and 8, reference numeral 11 denotes a transparent cylindrical member, which is attached to the middle-diameter cylindrical portion 8 of the joint body 2 in a close fitting manner, and has an outer flange portion. At 9, it is retained in a locking manner. The transparent cylindrical member 11 has a male threaded portion 12 on the distal end side, and a cap nut 13 is screwed thereon.
Further, the transparent cylindrical member 11 has an axially middle portion formed in a large diameter, the male screw portion 12 is provided with a slightly small diameter on the distal end side in the axial center direction, and the proximal end side in the axial center direction is gradually contracted. A fitting portion 14 having a diameter is provided, and the fitting portion 14 is attached to the medium diameter cylindrical portion 8.
Then, a large-diameter fitting hole portion 16 is formed through an intermediate stepped portion 15 from the axial center direction intermediate position of the hole portion inside the transparent cylindrical member 11 to the tip opening portion, and this fitting hole The opaque cylinder 20 is fitted to the portion 16.

Further, the transparent cylindrical member 11 includes a basic hole portion 17 having an inner diameter dimension substantially equal to the outer diameter dimension of the outer flange portion 9 of the joint body 2 and a medium diameter cylindrical portion on the proximal end side from the intermediate stepped portion 15. 8 has a mounting hole portion 18 having an inner diameter dimension substantially equal to the outer diameter dimension of eight.
The wall thickness of the opaque cylinder 20, than the level difference of the stepped portion 15, is set large, the inner diameter D ₂₀ of the inner peripheral surface of the opaque cylinder 20, than the inner diameter D ₁₇ of the basic opening 17 Also set it small.
The pipe drawing prevention member 1 will be described below. As shown in FIGS. 7 and 13, the pipe drawing prevention member 1 is made of a thin metal plate material, is an annular flat plate body, and has a large number of slits 19 formed radially from the inner periphery. A locking tooth piece 21 is provided. As shown in FIG. 7, the pipe pull-out prevention member 1 is attached between the transparent cylindrical member 11, the distal end surface of the opaque cylindrical body 20, and the inner flange portion inner surface of the cap nut 13. In a free state, the tooth piece 21 is inclined inward of the pipe joint as shown in FIG. Then, after the pipe P is inserted in the direction of the arrow A, when a pulling force acts on the pipe P, the tooth piece 21 bites into the outer peripheral surface of the pipe P and is locked. It includes a tooth piece 21 and is provided in the pipe joint in a plane orthogonal to the axial center, and is inclined inward in the pipe joint as the pipe P is inserted (in the direction of arrow A). It is also desirable to make a sliding contact (contact) and to engage with the outer peripheral surface of the pipe P (not shown).
In addition, in order to allow the locking tooth piece 21 to be elastically deformed inwardly in the pipe joint with insertion of the pipe P (giving relief), an inner peripheral corner portion on the distal end side of the opaque cylinder 20 is provided. A notch 22 is formed.

Then, 25 is an elastic C-ring which exerts a constantly elastic urging force in the radial outer direction in a state of FIG. 7 and FIG. 8 (A). When the pipe is not inserted, the elastic C-ring 25 is in pressure contact with the inner peripheral surface 23 of the opaque cylindrical body 20 that forms a part of the pipe joint internal space S with a radially outward elastic urging force. In other words, the inner peripheral surface 23 of the opaque cylindrical body 20 forms a part of the outer peripheral surface side of the pipe joint internal space S and is an inner peripheral surface for holding on which the elastic C-ring 25 in a pipe non-inserted state is pressed and held. It can be said that there is.

This elastic C-ring 25 has a square or rectangular cross section. Then, as shown in FIG. 7 to FIG. 8 (A), as indicated by an arrow A, the vector G is shown in contact with the distal end surface 28 of the pipe P inserted into the pipe joint internal space S from the outside. It is received and pressed as shown in FIG. 8 (A), and moves to the back (inward of the pipe joint).

Incidentally, the basic hole portion 17 constitutes a part of the internal space, and as described above, the inner diameter dimension D ₁₇ of the basic hole portion ₁₇ is larger than the inner diameter dimension D ₂₀ of the inner peripheral surface of the opaque cylindrical body 20. Also set to great. In other words, the inner diameter of the holding inner peripheral surface 23 is D _20, further basic hole 17 adjacently provided on the deeper side --- pipe joint inner side --- the holding inner peripheral surface 23 The inner diameter dimension D ₁₇ is larger than the inner diameter dimension D ₂₀ . Accordingly, as shown in FIGS. 8A to 8B, the elastic C-ring 25 is basically arranged adjacent to the inner side of the holding inner peripheral surface 23 while being elastically deformed in the diameter increasing direction by its own elastic urging force. The diameter 17 collides with the large-diameter inner peripheral surface 27 of the hole 17. An arrow C in FIG. 8B indicates the movement of the C-ring 25 at this time.

At the same time that the outer peripheral surface of the elastic C ring 25 collides with the large inner peripheral surface 27, a loud sound such as “buzz” or “bang” —that is, a connection completion notification sound H— is generated. . If the operator listens to the connection completion notification sound H with his / her ear, the pipe P can be inserted into the pipe joint to the proper depth, and the normal work completion can be confirmed (see FIG. 8B). In addition, according to this reference example , it is possible to feel intense instantaneous vibrations in the hand, so that it is possible to confirm the completion of the work more reliably.

The holding inner peripheral surface 23 for holding the elastic C-ring 25 in the pipe non-inserted state is constituted by the opaque cylindrical body 20 as described above. In the state in which the pipe is not inserted, in FIG. The C-ring 25 cannot be confirmed (visually).
However, the large-diameter inner peripheral surface 27 is constituted by the transparent cylindrical member 11 as described above, and after the diameter-expanding collision, as shown in FIG. It is visible across.
Here, the elastic C-ring 25 has a square (or rectangular) cross-sectional shape, and the outer peripheral surface of the C-ring 25 is in close contact with the large-diameter inner peripheral surface 27 as shown in FIG. Thus, even if there is a water drop film or the like on the large-diameter inner peripheral surface 27, the C-ring 25 can be clearly seen from any direction of approximately 360 °.
Desirably, the C-ring 25 is formed with a chromatic color for alerting such as red or yellow on the outer peripheral surface or the whole--that is, at least the outer peripheral surface--and collided with the large-diameter inner peripheral surface 27 in a diameter expansion manner. After that, it is preferable that the outer peripheral surface 26 of the C-ring 25 is visible through the transparent cylindrical member 11 from the outside for the chromatic color for alerting.

To make the outer surface of the C-ring 25 chromatic, it is manufactured by chromatic painting or chromatic film adhesion. To make the entire chromatic color, chromatic color is used up to the inside of the cross section when molded with plastic. Or, paint chromatic color on the outer surface.
Since it is a C-ring 25, the chromatic color can be easily seen from any direction over approximately 360 °, and the outer peripheral surface 26 of the C-ring 25 is elastically applied to the large-diameter inner peripheral surface 27. The close contact ensures reliable and easy visual inspection.

Next, FIGS. 9 to 12 show other reference examples . 9 is a schematic diagram corresponding to FIG. 7, FIG. 10 is a schematic diagram corresponding to FIG. 8A, and FIG. 11 is a schematic diagram corresponding to FIGS. Since the same reference numerals indicate the same configuration, repeated description is omitted, but the features of other reference examples shown in FIGS. 9 to 12 are as follows.
In other words, the elastic C-ring 25 has a tapered surface 35 with chamfered inner corners on the inner side. In order to prevent the sealing materials 4 and 5 from being damaged by the edge 28A of the distal end surface 28 of the pipe P when the pipe P is inserted, the sealing materials 4 and 5 are pressed in the depth direction of the sealing groove, A pipe guiding function for guiding the pipe tip is provided. In FIG. 10A, the inner peripheral edge 28A of the pipe P is sealed (O-ring) by pressing the outer seal material (O-ring) 4 of the two inward in the radial direction. The pipe guide and guide function is provided so that the pipe tip can get over the seal material (O-ring) 4 without contacting the pipe 4. The same applies to the other sealing materials (O-rings) 5.

Under the pipe is not inserted state, the standby position of the C-ring 25, and compared in Figure 7, are different. That is, the C-ring 25 is disposed closer to the opening of the distal end than in FIG. 7, and is disposed at a position where the sealing material 4 on the distal end side is slightly pressed. In addition, if there is a margin in terms of dimensions, it is preferable to move it slightly toward the tip. Further, FIG. 12A shows the C-ring 25 shown in FIGS. 9 to 11, but as shown in FIG. 12B, a rectangular shape is formed to make the taper surface 35 long and smoothly sealed. It is also preferable to press the materials 4 and 5 into the seal groove side. Alternatively, as shown in FIG. 12C, it is also preferable that the tapered surface 35 has a round shape.
Further, the C-ring 25 is preferably closed lightly in the state shown in FIGS. That is, since both ends of the cut of the C-ring 25 are in light contact with each other and the cut is closed, the seal materials 4 and 5 are not damaged when the seal materials 4 and 5 are moved over.

By the way, in FIGS. 1 to 6 (and FIGS . 7 to 12 of the reference example) and FIG. 13, the pipe pull-out prevention member 1 is an annular flat plate made of a thin metal plate as shown in FIG. However, in the present invention, the pull-out prevention member 1 is free to be other than this, and has a locking claw portion on the inner peripheral surface. It is also preferable to use a wedge-shaped member in which the locking claw portion bites into the outer peripheral surface of the pipe P when the pipe P is about to be pulled out with the inner peripheral surface at the tip of the cap nut 13 being a tapered diameter surface.
Also, as pipe joints, the right half structure of FIGS. 1 and 2 is arranged at both ends, or three right half structures of FIGS. 1 and 2 are arranged on a T-shaped joint body. It is free even if it is set up. Alternatively, an elbow type is also possible. Further, the holding inner peripheral surface 23 and the large-diameter inner peripheral surface 27 can be freely configured with parts having shapes and structures other than those illustrated.

  As described in detail above, the present invention provides a pipe joint provided with the pipe drawing-out preventing member 1; on the outer periphery, on the inner diameter-reduced tapered surface 33A, and on the outer diameter of the outer end of the tapered surface 33A. A ring body 33 having a small outer diameter surface 33C, pressed in contact with the distal end surface 28 of the inserted pipe P, and moved to the back; axial direction from the inner end 30A A plurality of elastically deformable petal pieces 30C formed by forming a plurality of slits 30B in the tube, and a cylindrical inner body 30 held inside the pipe joint; Then, the ring body 33 moves to the back, and the taper surface 33A is elastically deformed so as to expand the inner end of the petal piece 30C of the tubular interior body 30, so that the elasticity of the petal piece 30C is increased. Due to the elastic biasing force in the radial inward direction accompanying the deformation, Since the inner end of the petal piece 30C is rolled and generates a connection completion notification sound H, the operator inserts the pipe deeply into the normal position and completes the connection (construction completion). You can confirm by listening with your ears. In addition, when the pipe is not inserted into the petal piece 30C, the plastic is prevented from creeping in a free state (not causing elastic deformation), and the work is completed as if it were new even when the pipe is not used for a long period of time. ) Is generated with a loud notification sound H.

  Further, the ring body 33 has a tapered surface 33D having a chamfered inner corner on the inner peripheral side, and when the pipe P is inserted, the sealing members 4 and 5 are damaged by the edge 28A of the distal end surface 28 of the pipe P. In order to prevent this, a pipe guiding function for pressing and guiding the sealing materials 4 and 5 is provided, so that the ring body 33 functions as two birds with one stone and requires fewer internal components. In particular, while the pipe P is cut, the sealing material 4 and 5 is pressed toward the seal groove immediately before the edge 28A of the cut end where the square protrusion or the thin protruding piece protrudes over the sealing material 4 or 5. Therefore, the sealing materials 4 and 5 can be prevented from being damaged during the connection work.

  Further, when the pipe is not inserted, the petal piece 30C of the cylindrical interior body 30 is not subjected to an external force that causes elastic deformation, and is kept in a free state. Therefore, the cylindrical interior body 30 can be easily manufactured at low cost. Can be plastic. That is, the occurrence of the creep phenomenon peculiar to plastics can be prevented, and even after a long period of non-use, a large notification sound H is stably emitted with a resilience that is the same as that of a new product.

In addition, the tubular member 11 surrounding the ring body 33 is made transparent at the back position where the ring body 33 is hit by the petal piece 30C and generates the connection completion notification sound H. Since the ring body 33 has a chromatic color for alerting as a whole or an outer peripheral surface 33Z, and the chromatic color for alerting is visible from the outside at the back position, it can be easily and reliably. Can detect connection completion (construction completion). This is particularly effective at sites with noise .

1 Pipe withdrawal prevention member 4, 5 Sealing material (O-ring)
11 transparent tubular member
26 outer peripheral surface
28 Tip surface
28A edge
30 Tubular interior
30A inner end
30B slit
30C petal pieces
33 Ring body
33A Inner diameter taper surface
33C surface to be covered
33D Tapered surface
33Z outer peripheral surface
H connection completion notification sound P pie-flops

Claims (4)

In the pipe joint provided with the pipe withdrawal prevention member (1),
On the outer periphery, the taper surface (33A) having an inwardly reduced diameter and a surface to be polished (33C) having an outer diameter smaller than the outer diameter of the outer end of the taper surface (33A) are inserted. A ring body (33) that is pressed in contact with the tip surface (28) of the round pipe (P) and moves to the back;
A cylindrical shape having a plurality of elastically deformable petal pieces (30C) configured by forming a plurality of slits (30B) in the axial direction from the inner end (30A) and held inside the pipe joint An interior body (30),
As the pipe (P) is inserted, the ring body (33) moves to the back, and the tapered surface (33A) moves the inner end of the petal piece (30C) of the cylindrical interior body (30). The surface to be scraped (33C) of the ring body (33) is elastically deformed so that the petal piece (30C) is elastically energized in the radial direction along with the elastic deformation of the petal piece (30C). A pipe joint characterized in that the inner end of the petal piece (30C) is rolled and generates a connection completion notification sound (H).   The ring body (33) has a tapered surface (33D) having a chamfered inner corner on the inner peripheral side. When the pipe (P) is inserted, the edge (28A) of the tip surface (28) of the pipe (P) is inserted. The pipe joint according to claim 1, further comprising a pipe guiding function for pressing and guiding the sealing materials (4) and (5) in order to prevent the sealing materials (4) and (5) from being damaged by the above.   2. The pipe joint according to claim 1, wherein the petal piece (30 </ b> C) of the cylindrical interior body (30) is not subjected to an external force that causes elastic deformation when the pipe is not inserted. A cylindrical member (11) surrounding the ring body (33) at a back position where the ring body (33) is hit by the petal piece (30C) and generates the connection completion notification sound (H). ) Is transparent, and the ring body (33) has a chromatic color for alerting the whole or outer peripheral surface (33Z), and the chromatic color for alerting can be visually observed from the outside at the back position. claim 1, 2 or 3 pipe joint according is configured.

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