JP5421606B2 - Pipe joint and method for disconnecting pipe joint - Google Patents

Description

  The present invention relates to a pipe joint and a method for releasing connection of a pipe joint.

  Conventionally, as a hot water supply and hot water supply piping system for houses, water supply main pipes and hot water supply main pipes are connected to metal water supply headers and hot water supply headers, respectively, while water supply branch pipes and hot water supply branch pipes branched from the header in a tako-foot shape A header construction method is employed in which the connection portion of the device is connected one-to-one.

  Specifically, in the header piping system, the main pipe led to the under-floor space of the house is connected to the header main body of the header, while the branch pipe is connected to each branch connection section of the header, and each branch pipe is under the floor. It goes around the space and is connected to the connection part of each equipment.

  In such a header piping system, when connecting the main pipe and the branch pipe to the header main body section and the branch connection section of the header, respectively, connect the main pipe and the branch pipe to the pipe joint, and connect the pipe joint to the header main body section and the branch connection section. The method of screwing in and connecting is adopted from the viewpoint of exchangeability of branch pipes and the like.

  On the other hand, in recent years, a synthetic resin header has been used. However, when a screw connection is made to the synthetic resin header, a large force acts on the screw portion, which is disadvantageous in terms of strength. For this reason, when using a header made of a synthetic resin, as shown in Patent Document 1, the header main body portion, the pipe joint, the branch connection portion, and the pipe joint, which have the flanges butted together, are connected using an elastic connection fitting. A method called fastener connection is adopted.

  In addition, as shown in Patent Document 2, it is also proposed to screw a stopper provided with an expansion prevention portion to the branch connection portion, as shown in Patent Document 2, to prevent the expansion of the branch connection portion, which is a problem with a synthetic resin header. ing.

  By the way, as an elastic connection metal fitting of patent document 1, it is common to use the spring material which consists of a stainless steel plate. However, when the header body of the header and the pipe joint and the branch joint and the pipe joint are connected using such an elastic fitting, for example, when a water hammer phenomenon occurs when the water tap is suddenly closed, Pulling forces that try to separate from each other act on the connection with the pipe joint. Thereby, there exists a possibility that the flange of the resin header in which intensity | strength is insufficient compared with a metal pipe joint may be damaged.

  For this reason, in Patent Document 1, the reinforcing ring is attached to the annular groove forming the flange. However, when the thickness of the reinforcing ring is small, it is easy to attach to the annular groove, but it is deformed at the time of attachment. Or the reinforcing effect is small, and the effect of dispersing the pulling force acting on the flange is small. In particular, there is no problem when it is molded from plastics with relatively high strength at high temperatures, such as engineering plastics, but when headers are molded from general-purpose resins such as olefins and vinyl chloride, It cannot be applied to.

  On the contrary, when the thickness of the reinforcing ring is large, there is a drawback that it cannot be easily deformed and is not easily mounted. In addition, when the thickness of the reinforcing ring is large, deformation of the connecting portion between the header and the pipe joint hardly occurs, but since the outer diameter is defined by the elastic connecting fitting, the thickness of the resin of the flange is accordingly increased. It becomes thin and causes a decrease in strength.

  On the other hand, in the connection structure of Patent Document 2, although it is possible to prevent the water stoppage from being lowered due to the expansion of the branch connection portion, there is still a problem with respect to the breakage of the screw connection portion. That is, when the header is molded with a cross-linked polyethylene, which is a general-purpose resin, if the screw is tightened excessively, the screw may be damaged. On the other hand, if the screw is not tightened sufficiently, the screw will loosen due to axial pull-out force due to internal water pressure, vibration or shock due to pulsating water pressure, etc. There is a risk of getting out.

  For this reason, in Patent Document 2, as a measure to prevent the screws from loosening, the header body portion of the header is formed with an anti-rotation projection corresponding to the tip of the plug, while the anti-rotation portion is formed at the tip of the plug, The anti-rotation portion is engaged with the anti-rotation protrusion by screwing to the set position. However, the loosening torque of the screw increases as the pitch of the screw increases, and there is concern about the strength of the anti-rotation protrusion in the resin header. Conversely, if the pitch of the screw is reduced, the rotational force is reduced, but the amount of axial movement per rotation when the screw is screwed is reduced, and the height of the anti-rotation protrusion cannot be increased. Thus, the problem of strength remains in the loosening prevention structure of Patent Document 2.

  If the anti-rotation part is strongly engaged with the anti-rotation protrusion in consideration of strength, it will be difficult to remove the plug from the header, or the anti-rotation protrusion will be damaged beyond the elastic limit and the header will be replaced. There is a risk of a situation that must be done.

JP 2005-188682 A Japanese Patent No. 3578696

  The present invention has been made in view of such problems, and can be connected to a joint connection portion of a piping material such as a resin header by screw coupling, and can reliably prevent loosening and breakage of a screw. And it aims at providing the pipe joint which can be removed from piping materials, without damaging as needed, and the connection release method of this pipe joint.

In order to achieve the above object, a pipe joint according to claim 1 of the present invention (hereinafter referred to as “pipe joint of claim 1”) has a male threaded cylinder at the tip of the joint connecting part, and a male threaded cylinder. A flange having a locking projection having a tapered surface that protrudes radially outward of the flange body gradually toward the screw tightening direction on a part of the outer peripheral surface of the flange body on the base end side of the flange A joint body that is connected to a piping material made of a synthetic resin and has an end portion that can be inserted into the male threaded cylinder portion at one end; A pipe joint comprising a cap nut body portion having a female screw cylinder portion screwed into the male screw cylinder portion of the material from the outside, and a cap nut provided with a rotation prevention portion, the rotation prevention portion having one end portion movable portion integrally connected to the outer peripheral side of the cap nut body portion And consists extending portion which extends in the axial direction beyond the end face of the cap nut body portion from the movable portion, the movable portion is a circular arc shape with an inner diameter slightly larger diameter than the outer circumference of the cap nut body portion If you are, the difference port of the fitting body is inserted to the male screw cylindrical portion, with the screwing of the male screw cylindrical portion of the cap nut body portion, the movable portion while the extending portion is received in the tapered surface Is elastically deformed toward the radially outer side of the cap nut main body, and when the extending portion gets over the locking protrusion, the movable portion is elastically restored to the flange main body side, and the extending portion is locked. The cap nut is locked by the end face of the cap nut to prevent the screw in the loosening direction of the cap nut, and a force is applied to the extending portion radially outward of the flange main body to lock the extending portion. bags nut while elastically deforming said movable part so as to deviate from It is characterized by being detent releasably formed by rotating in the loosening direction body portion.

The pipe joint according to claim 2 of the present invention (hereinafter referred to as "the pipe joint of claim 2") is the pipe joint according to claim 1, wherein the joint body has two locking projections at 180 degree symmetrical positions. And the cap nut is provided with a rotation preventing portion at a position corresponding to the locking projection .

In the pipe joint of the present invention, the material of the joint body may be metal or resin.
As the resin for the joint body, for example, when the use temperature is low such as for water supply, polyvinyl chloride, polybutene, cross-linked polyethylene, polyethylene, etc. may be used, but when the use temperature such as hot water supply is high, engineering plastics such as Polyacetal, polyethersulfone, polyphenylene sulfide, polysulfone, polyphenylsulfone and the like are preferable.
Although it does not specifically limit as a structure of a coupling main body, For example, a socket type | mold, an elbow type | mold, a cap type | mold, a joint type | mold etc. which have both opening parts are mentioned.
Further, the structure of the tube insertion portion of the joint body is not particularly limited, but for example, just by inserting the pipe to be connected into the tube insertion portion, the diameter-expanding piece in the diameter-expanded state of the tightening ring will fly, and the tightening ring Is a known one-touch connection structure (for example, Sekisui Chemical Co., Ltd., trade name “Esrocatit”) that is elastically shrunk and tightened between the nozzle-shaped inner cylinder inserted into the tube and prevented from coming off and water-stopping. Structure, a structure described in JP-A-2001-295974).

  On the other hand, the cap nut is preferably made of synthetic resin. As the synthetic resin constituting the cap nut, it is desirable to use cross-linked polyethylene, engineering plastics such as polyacetal, polyethersulfone, polyphenylene sulfide, polysulfone, and polyphenylsulfone when the temperature becomes high, such as for hot water supply. . On the other hand, when the temperature is not high, such as for water supply, general-purpose resins such as vinyl chloride, polybutene, and polyethylene can be employed.

  Although it does not specifically limit as a piping material to which the pipe joint of this invention is connected, For example, the header which has a some branch connection part in the side surface of a header main-body part is mentioned.

  Here, the synthetic resin constituting the piping material is not particularly limited. For example, when high temperature strength is required, engineering plastics such as cross-linked polyethylene, polyether sulfone, and polyphenyl sulfone are used. Is preferred. On the other hand, olefin-based resins such as vinyl chloride, polypropylene, and polybutene may be used when water strength is not particularly required at high temperatures. Cross-linked polyethylene is most preferred because it satisfies both quality and cost.

  In the present invention, it is preferable that the flange of the tubular connecting member is formed in a substantially elliptical shape, and each engaging recess or locking protrusion is formed in the major axis direction. As a result, the engaging claw of the detent member or the extended portion of the detent member can be run on the outer peripheral surface from the short axis direction side of the flange of the branch connection portion. Can be easily guided to the surface.

  In the present invention, it is preferable that the movable part of the detent member has an arc shape or an arm shape in which one end is integrally connected to the cap nut.

  In the present invention, the piping material made of synthetic resin is not particularly limited. For example, a header including a header main body portion having an end connection portion and a plurality of branch connection portions connected to the side surface of the header main body portion. Is mentioned.

  On the other hand, in the pipe joint connection release method according to the present invention, the cap nut portion of the pipe joint according to claim 2 or 3 connected in a non-rotating state by two anti-rotation portions is formed into an arc shape of a tool. Two locking release claws that are arranged so as to be included in the action portion and are point-symmetrically provided with respect to the rotation center of the action portion so as to extend from the action portion respectively correspond to the extension , Face the gap between the flange and the flange body from the tightening direction side of the cap nut body, hold the tool handle connected to the action portion, and rotate the action portion in the screw nut release direction. Then, the lock release claw that has entered the gap between the extension part and the flange body part pushes the extension part outward in the radial direction of the bag nut body part to release the detent, while releasing the bag nut in the screw release direction. It is characterized by rotating.

The tool used in the connection release method of the present invention is not particularly limited, but a metal or synthetic resin tool can be used.
From the viewpoint of strength, a metal one is excellent, but a synthetic resin one may be used in consideration of productivity and workability (light weight, thickness of unlocking claw).
Moreover, the said tool is good also as a structure which equips the both ends of a handle | steering-wheel part with the action part of a different magnitude | size so that connection of the pipe joint from which a diameter differs can be cancelled | released.

  In the present invention, the arc shape means a semicircular arc shape, a semi-elliptical arc shape, a bow shape, or the like, and the arc may not be symmetric with respect to the central axis.

Since the pipe joint according to the present invention is configured as described above, it can be connected to a joint connection portion of a piping material such as a resin header by screw connection and reliably prevents loosening and breakage of the screw. And can be removed from the piping material as needed without being damaged.
That is, when the female screw cylinder part of the cap nut main body part is screwed into the male screw cylinder part after inserting the joint part of the joint body into the male screw cylinder part provided at the joint connection part of the piping material, The protruding portion contacts the tapered surface of the locking projection. As the screw is further screwed in, it is elastically deformed so as to expand the movable part and rides on the tapered surface. Then, when the extension portion is screwed to the position over the locking projection, the elastic deformation of the rotation preventing portion is eliminated and the original shape is restored.

  As a result, the male screw cylinder part is expanded by water pressure by inserting the female screw cylinder part of the cap nut main body part from the outside while inserting the joint part of the joint main body into the male screw cylinder part of the piping material. In addition, the water stoppage can be prevented from decreasing. In addition, even if the cap nut body portion is about to rotate in the screw loosening direction, the extension portion of the rotation prevention portion is locked to the end face of the locking projection formed on the flange of the piping material, so that the male screw cylinder portion and the female screw cylinder Rotation is prevented in the screwing release direction with the part. Therefore, the cap nut does not rotate and loosen due to the axial pull-out force of the joint body due to internal water pressure, vibration or impact due to pulsating water pressure, and the joint body can be reliably prevented from coming off or leaking. .

  In addition, it is possible to connect to the joint connection part of the piping material by a simple operation such as inserting the outlet part of the joint body into the tubular connection member and rotating the cap nut at a set angle without using a tool or the like. It can be done easily. In addition, there is no occurrence of damage to the male screw cylinder part and the female screw cylinder part due to excessive screwing of the cap nut, and the locking of the locking protrusion and the extension part can be confirmed by visual observation, and the anti-rotation member It can also be confirmed by the seating sound when the extended portion is seated on the wall surface of the flange main body when recovering from the elastically deformed state, and insufficient screwing does not occur.

On the other hand, in such a connection state of the pipe joint piping material, if a force is applied to the extended portion radially outward of the flange main body, the anti-rotation portion is elastically deformed so that the extended portion is disengaged from the locking projection. The rotation preventing state is released by rotating the cap nut main body portion in the loosening direction.
The pipe joint can be easily removed from the piping material by further rotating the cap nut in the loosening direction to completely release the screwing of the male threaded cylindrical portion between the female screw cylindrical portion and the piping material.
That is, the pipe joint and the pipe connected to the pipe insertion portion can be easily replaced and inspected.

  Further, if the pipe joint structure of claim 2 is used, the detents are made at a plurality of locations, so that a more decent state of rotation can be secured and a deterrent state with a small number of rotations of the cap nut can be secured. It can be secured, and the connection work to the piping material becomes easier.

  Since the pipe joint connection releasing method according to the present invention is configured as described above, the pipe joint can be easily detached from the piping material even in a narrow work site.

It is a front view of a 1st embodiment of a pipe joint concerning the present invention. It is an A direction arrow directional view of FIG. It is the BB sectional view taken on the line of FIG. FIG. 2 is a plan view showing an example of a header to which the pipe joint of FIG. 1 is connected. It is a C direction arrow directional view of FIG. It is sectional drawing of the header of FIG. It is a front view of the state which connected the pipe joint shown in FIG. 1 to the header. It is a perspective view showing an example of the tool for connection cancellation. It is a figure explaining the connection release method using the tool of FIG. It is a front view of 2nd Embodiment of the pipe joint concerning this invention. It is sectional drawing of the pipe joint of FIG. It is a front view of 3rd Embodiment of the pipe joint concerning this invention. It is sectional drawing of the pipe joint of FIG. It is a front view of 4th Embodiment of the pipe joint concerning this invention. It is sectional drawing of the pipe joint of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a first embodiment of a pipe joint according to the present invention.
As shown in FIGS. 1 to 3, the pipe joint 1 a (1 b) includes a joint body 2 a and a cap nut 3.

The joint body 2a is provided with a difference port portion 21 at one end and a pipe mounting portion 22 at the other end.
The insertion port 21 is inserted into a male screw cylinder 45 provided in a joint connecting portion of a piping material such as the header 4 described later, and an O-ring 21a is fitted around the periphery.
The tube attachment portion 22 communicates with the outlet portion 21 and has a nozzle-like inner cylinder portion 22a inserted into an end portion of a tube such as a cross-linked polyethylene pipe connected to the tube attachment portion 22, and the inner cylinder portion. An outer cylinder portion 22b that forms an insertion space for a tubular tube between 22a.

As shown in FIG. 3, an O-ring 22 c that fits water tightly on the inner wall surface of the tube inserted into the tube mounting portion 22 is fitted around the inner cylinder portion 22 a.
Moreover, as shown in FIG. 3, the fastening ring 23, the diameter-expanding piece 24, and the retaining ring 25 are accommodated inside the outer cylinder part 22b.

  The tightening ring 23 has a ring shape with a part thereof cut off, and before the tube is inserted, the diameter-expanding piece 24 is inserted between the cut surfaces, and the inner diameter is larger than the outer diameter of the tube. When the diameter-expanding piece 24 is pushed and removed at the end of the pipe by inserting the pipe, the diameter is reduced by the elastic force so that the pipe wall is tightened to the inner cylindrical portion 22a side.

The retaining ring 25 is designed to bite into the outer wall surface of the tube and prevent the tube from coming off when a force in the withdrawal direction is applied to the inserted tube.
That is, when the tube is inserted to a predetermined position (position where the diameter-expanded piece 24 is removed), the tube attachment portion 22 connects the tube in a watertight and firm manner with one touch by the action of the tightening ring 23 and the retaining ring 25. It can be done.

The cap nut 3 is provided with the cap nut main-body part 31 and the two rotation prevention parts 32, as shown in FIG.
As shown in FIGS. 2 and 3, the cap nut body 31 includes a female threaded cylinder part 31a, and cannot be detached from the joint body 2a so that the opening end of the female threaded cylinder part 31a faces the tip of the differential part 21. And it is rotatably mounted.

As shown in FIG. 3, the female screw cylinder portion 31 a is provided with two spiral grooves 31 b each having a pitch of approximately 1 pitch (360 degrees) each having a start end shifted by 180 degrees on the inner peripheral surface.
The two detent portions 32 are provided point-symmetrically with the center axis of the cap nut main body portion 31 as the center of symmetry, and include a movable portion 32a and an extending portion 32b.

The movable portion 32 a has an arc shape having an inner diameter slightly larger than the outer peripheral surface of the cap nut main body portion 31, and one end is concentric with the outer wall surface of the cap nut main body portion 31 on the wall surface of the cap nut main body portion 31. It is fixed to become. In addition, the movable portion 32a is fixed when a gap having a substantially uniform width is formed between the movable nut 32a and the outer wall surface of the cap nut body 31 in the no-load state, and when a force is applied in the radial direction of the cap nut main body 31. It is designed to be elastically deformed in the direction in which force is applied around the part.
The extending portion 32 b is provided so as to extend from the open end of the movable portion 32 a in parallel to the central axis of the cap nut main body portion 31 and outward from the end edge of the cap nut main body portion 31.

  And this pipe joint 1a (1b) is connected as shown in FIG. 7 to the synthetic resin header 4 as a piping material shown in FIGS.

That is, the header 4 includes a header main body portion 41 and six branch connection portions 42.
The header main body 41 has a cylindrical shape with one end closed and the other end opened, and a main pipe fitting joint 43 at the other end.
As shown in FIG. 6, each branch connection part 42 protrudes in parallel from one side of the header body 41, communicates with the header body 41, and has a branch pipe fitting connection 44 at the tip. I have.

As shown in FIG. 7, the main pipe fitting joint 43 is connected to a pipe joint 1a having a large diameter (for example, a nominal diameter 20A), and the branch pipe fitting joint 44 has a small diameter (for example, a nominal diameter 13A). The pipe joint 1b is connected, and as shown in FIG. 4 or FIG. 5, a male threaded cylinder 45 and a flange 46 each having a size corresponding to the pipe joint 1a or the pipe joint 1b to be connected are provided. ing.
As shown in FIGS. 4 to 6, the male threaded cylinder portion 45 has a double thread structure composed of two spiral protrusions 45 a each having a pitch of approximately 1 pitch, each having a start end shifted by 180 degrees, and the pipe joint 1 a ( Or the internal thread cylinder part 31a provided in the cap nut main-body part 31 of the pipe joint 1b) is screwed together.
As shown in FIGS. 4 to 6, the flange 46 includes an elliptical flange body 46 a that is slightly larger than the outer diameter of the cap nut body 31, and two locking protrusions 46 b provided at symmetrical positions. I have.

  Each of the locking projections 46b has a locking surface 46c at a position deviated from the major axis of the ellipse of the flange main body 46a by approximately 45 degrees, and the screw of the male screw cylinder 45 is tightened from the tip of the locking surface 46c. A taper surface 46d provided so as to gradually approach the flange main body 46a on the opposite side to the direction and be flush with the flange main body 46a at the terminal end is provided. That is, the height of the locking protrusion 46b from the flange body 46a gradually increases in the screw tightening direction.

  The flange 46 has an elliptical flange main body 46 a whose major axis is perpendicular to the tube axis of the header main body 41.

Next, the construction procedure of the pipe joint 1a (1b) to the main pipe joint joint 43 (branch pipe joint joint 44) and the movement of each part during construction will be described.
In connection, first, after inserting the front-end | tip part of the port part 21 of the pipe joint 1a (1b) in the corresponding external thread cylinder part 45 of the header 4, the spiral groove 31b of the internal thread cylinder part 31a of the cap nut main-body part 31 is carried out. Then, the cap nut 3 is screwed by screwing together the spiral protrusion 45a of the male screw cylinder 45.

Along with this screwing, the differential port portion 21 enters toward the inside of the male screw tube portion 45. Further, when the cap nut main body 31 is screwed in until it is rotated by about 90 degrees, the extended portion 32b is an edge of the flange main body 46a on the male screw cylinder portion 45 side in the vicinity of the short axis of the ellipse. And moves in the direction of the flange 46 to a position substantially coinciding with the leading edge of the extending portion 32b.
When the cap nut 3 is further screwed in, the extension portion 32b is first received by the taper surface 46d of the locking projection 46b, and along the taper surface 46d due to elastic deformation of the movable portion 32a as the screwing progresses. And gradually move outward in the radial direction of the flange 46.

Then, when the cap nut main body portion 31 is screwed in until it rotates approximately 180 degrees, the extension portion 32b gets over the locking projection 46b, and the anti-rotation portion 32 of the cap nut main body portion 31 by the elastic restoring force of the movable portion 32a. The original shape along the outer peripheral surface is restored. Therefore, as shown in FIG. 7, even if the cap nut 3 tries to rotate in the loosening direction of the screw, the extended portion 32b comes into contact with the locking surface 46c of the locking projection 46b and is prevented from rotating in the loosening direction. The
At the same time, the end face of the cap nut main body 31 is received by the flange 46, and further screwing is impossible.

  The pipe joint 1a (1b) is connected to the header 4 as described above, and is not shown, but one end of the main pipe is connected to the pipe attachment portion 22 of the pipe joint 1a, and the pipe of the pipe joint 1b is connected. One end of the branch pipe is connected to the attachment portion 22.

  According to this connection structure, the male screw tube portion 45 is inserted into the male screw tube portion 45 by the water pressure in the header 4 by inserting the cap 21 of the joint body 2 a and screwing the cap nut 3. It is possible to prevent the water stoppage from being lowered. That is, the cap nut main body portion 31 abuts against the flange 46 to prevent further screwing, while the extension portions 32b of the rotation preventing portion 32 are respectively formed on the locking projections 46b formed 180 degrees apart. By locking and preventing movement in the loosening direction, the rotation of the cap nut 3 is prevented, and the cap nut 3 is also rotated and loosened by an axial pull-out force due to internal water pressure, vibration or impact due to pulsating water pressure, and the like. It is possible to reliably prevent the joint body 2a from coming off or water leakage.

  In addition, the pipe joint 1a (1b) can be attached to the header 4 by a simple operation by inserting the insertion port 21 of the joint body 2a into the male screw cylinder 45 and rotating the cap nut 3 by about 180 degrees without using a tool. ) Can be connected, so that the connection work can be performed very easily and reliably. In addition to not causing damage to the spiral protrusion 45a and the spiral groove 31b due to excessive screwing of the cap nut 3, the locking of the locking protrusion 46b and the extending portion 32b can be confirmed by visual observation, The rotation stopper 32 can be restored from the elastically deformed state and can be confirmed by a clicking sound when seated on the cap nut 3, and there is no occurrence of insufficient screwing.

Further, when the cap nut 3 is formed, the anti-rotation portion 32 can be integrally formed, and can be manufactured at a low cost, and the anti-rotation portion is compared with the case where the anti-rotation portion 32 is provided separately. There is no construction error such as forgetting to wear 32.
It is supposed to be attached.

Normally, the pipe joint 1a (1b) once attached to the header 4 is hardly necessary to be removed, but the pipe end processing of the pipe connected to the pipe mounting portion 22 by an unskilled worker is insufficient. Before the tube end portion is sufficiently inserted into the tube mounting portion 22, the diameter-expanding piece 24 is detached and the fastening ring 23 is reduced in diameter so that a good connection cannot be obtained. It is not necessary to replace the pipe fitting 1a with a new pipe fitting 1a. Also,
In such a case, the pipe joint 1a (1b) once connected to the header 4 can be removed by using a connection release tool 5 as shown in FIGS.

That is, the tool 5 is a synthetic resin molded product such as ABS resin, and is provided with an action part 52 for the pipe joint 1a at one end of the handle part 51 and an action part 53 for the pipe joint 1b at the other end.
The action portion 52 has an arc shape that is large enough to contain the cap nut 3 of the pipe joint 1a, and one end side of the arc is integrated with the handle portion 51. 55 is provided integrally.

The unlocking claw 54 is provided so as to protrude outward from the end of the action portion 52 on the handle portion 51 side.
The unlocking claw 55 has a rotational center of the action part 52 (a rotation center of the cap nut main body 31 of the pipe joint 1a in the use state) from a connecting part 56 extending from the open end of the action part 52 as a center of symmetry. It is provided so as to be point-symmetric with the unlocking claw 54.

The virtual circle passing through the tip of the unlocking claw 54 and the tip of the unlocking claw 55 around the rotation center of the action part 52 is substantially the same as or slightly the same as the virtual circle along the inner wall surfaces of the two extending parts. It has a small diameter.
The connecting portion 56 is provided so that the gap between the unlocking claw 55 and the action portion 52 is slightly larger than the thickness of the extending portion 32b so that the extending portion 32b enters.

The action portion 53 is the same as the action portion 52 except that the action portion 53 has an arc shape that is large enough to contain the cap nut 3 of the pipe joint 1b.
Further, the lock release claw 54 and the lock release claw 55 provided integrally with the action portion 53 are symmetrical with respect to the rotation center of the action portion 53 (the rotation center of the cap nut main body portion 31 of the pipe joint 1b in use). It is provided so as to be point-symmetric with respect to the center.

Next, a method for releasing the connection between the pipe joint 1a and the pipe joint 1b using the tool 5 will be described taking the case of the pipe joint 1b as an example.
That is, first, as shown in FIG. 9 (a), the action portion 53 includes the cap nut 3 in the action portion 53, and the lock release claw 54 and the lock release claw 55 have the tips at the cap nuts. The tool 5 is arranged so as to face between the extension part 32b and the flange main body part 46a in a state facing the direction opposite to the tightening direction 3.
Then, holding the handle portion 51, the action portion 53 is rotated in the screw release direction (counterclockwise as viewed in FIG. 9) so that the center of rotation coincides with the central axis of the cap nut body portion 31. .

As described above, the virtual circle passing through the distal end of the locking release claw 54 and the distal end of the locking release claw 55 around the rotation center of the action portion 53 is substantially the same as the virtual circle along the inner wall surfaces of the two extending portions 32b. Since the diameter is slightly smaller, as shown in FIG. 9 (b), the lock release claw 54 and the lock release claw 55 enter between the corresponding extension part 32b and the flange main body part 46a by this rotation. The extending portion 32b moves in the diameter increasing direction while the movable portion 32a is elastically deformed by the tapered surfaces of the locking release claw 54 and the locking release claw 55.
Then, when the extending portion 32b moves above the locking protrusion 46b and the locking surface 46c, rides on the top of the tapered surface 46d and is received by the tapered surface 46d, the extending portion 32b is caused by the elastic restoring force of the movable portion 32a. Is pressed against the tapered surface 46d to receive a drag force in the loosening direction from the tapered surface 46d, and the cap nut 3 rotates in the direction in which the screwing is released without rotating the action portion 53.
Then, if the tool 5 is removed, the cap nut 3 is further loosened by hand, and the screwing of the male screw cylinder part 45 and the female screw cylinder part 31a is completely released, as the screwing is released, the opening 21 is By retreating in the outlet direction of the male screw cylinder 45, the fitting of the outlet 21 to the male screw cylinder 45 is also released, and the pipe joint 1 b can be removed from the header 4.
Further, the pipe joint 1a can be detached from the header 4 in the same manner as described above using the action portion 52 side.

The advantages of using the tool 5 are as follows.
That is, the cap nut 3 is configured to turn the cap nut body 31 by hand while applying a finger to each of the extending portions 32b and jumping up so that the extending portions 32b are outside the locking projections 46b. Can also be disconnected.

However, the header 4 is provided along the wall surface or the floor surface, and there is no space for putting a hand or a finger on the back side of the header 4, or there is no connection between the branch pipe fitting joint 44 and the branch pipe fitting joint 44. In some cases, the gap is so narrow that a hand or finger cannot be inserted into the back side of the header 4.
Therefore, if the tool 5 is used as described above, the pipe joint 1a (1b) can be easily detached from the header 4 even in a narrow work space where a hand or a finger cannot be inserted into the back side of the header 4. .

10 and 11 show a second embodiment of the pipe joint according to the present invention.
As shown in FIGS. 10 and 11, the pipe joint 1c is the same as the pipe joint 1a except that the joint body 2b has an elbow shape.

12 and 13 show a third embodiment of the pipe joint according to the present invention.
As shown in FIGS. 12 and 13, the pipe joint 1 d is provided with the opening portions 21 on both sides of the joint body 2 c, and the cap nuts 3 are provided at both the opening portions 21, respectively. It is the same as that of the said pipe joint 1a except becoming a joint type which connects material.

14 and 15 show a fourth embodiment of the pipe joint according to the present invention.
As shown in FIGS. 14 and 15, the pipe joint 1 e is the same as the pipe joint 1 a except that the joint body 2 d is an end cap type including only the closed portion 28 in the closed state. .

The present invention is not limited to the above embodiment. In the above embodiment, there are two rotation stoppers, but there may be one, or three or more. The flange shape may also be a shape that matches the number of rotation stoppers.
In the above embodiment, one end of the header main body is closed, but pipe joint connecting portions may be provided on both sides.

1a, 1b, 1c, 1d, 1e Fittings 2a, 2b, 2c, 2d Fitting main bodies 21, 28 Fittings 22 Pipe mounting part 3 Cap nut 31 Cap nut main body 31a Female thread cylinder 31b Spiral groove 32 Non-rotating portion 32a Movable part 32b Extension part 4 Header (piping material)
43 Main Pipe Joint Connection 44 44 Branch Pipe Joint 45 45 Male Threaded Cylinder 45a Spiral Projection 46 Flange 46a Flange Body 46b Locking Projection 46c Locking Surface 46d Tapered Surface

Claims (4)

It has a male threaded cylinder at the tip of the joint connection, and gradually protrudes radially outward of the flange body toward the screw tightening direction on a part of the outer peripheral surface of the flange body at the proximal end of the male threaded cylinder And connected to a piping material made of synthetic resin having a flange formed with a locking projection having a tapered surface,
A joint body having at one end a differential opening that can be inserted into the male screw cylinder;
A cap nut body portion having a female screw cylinder portion that is attached to the joint main body so as not to be detached and is rotatable and is screwed into the male screw cylinder portion of the piping material from the outside, and a cap nut having a rotation preventing portion. A pipe joint comprising:
The anti-rotation portion includes a movable portion whose one end portion is integrally connected to the outer peripheral side of the cap nut body portion, and an extending portion that extends from the movable portion beyond the end surface of the cap nut body portion in the axial direction. ,
The movable part has an arc shape having an inner diameter slightly larger than the outer periphery of the cap nut body part,
Is inserted a difference port of the joint body to the male screw cylindrical portion, with the screwing of the male screw cylindrical portion of the cap nut body portion, the extending portion is the movable part is cap nut body while being received in the tapered surface When the extended portion gets over the locking projection, the movable portion is elastically restored to the flange main body side, and the extended portion is engaged by the end surface of the locking projection. It is stopped and the screw nut main body is screwed in the loosening direction,
By applying a force to the extension part radially outward of the flange body part, rotating the cap nut body part in the loosening direction while elastically deforming the movable part so that the extension part is removed from the locking projection. A pipe joint characterized in that it is formed so as to be capable of releasing rotation.
2. The pipe joint according to claim 1, wherein the joint body has two locking protrusions at a 180-degree symmetrical position, and the cap nut includes a rotation stopper at a position corresponding to the locking protrusion .
  The pipe joint according to claim 1 or 2, wherein the piping material is a header including a header main body portion having an end connection portion and a plurality of branch connection portions connected to a side surface of the header main body portion.   The cap nut portion of the pipe joint according to claim 2 or 3 connected in a detent state by two detent portions is disposed so as to be included in the arc-shaped act portion of the tool, and the act portion Two locking release claws having a wedge-shaped cross section provided symmetrically with respect to the center of rotation of the action portion so as to extend from the gap nut between the corresponding extension portion and the flange main body portion, respectively. Facing from the tightening direction side, hold the tool handle part connected to the action part, rotate the action part in the screw release direction of the cap nut body part, and enter the gap between the extension part and the flange body part A connection release method for a pipe joint, characterized in that the extension portion is pushed outwardly in the radial direction of the cap nut main body portion by the lock release claw and the cap nut is rotated in the screwing release direction while releasing the locking.

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