JP5268100B2 - Pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent the come-off of a male member from a female member. <P>SOLUTION: One of the female member 1 and the male member 2 has an expansive portion 3 to be elastically deformed in the radial direction during insertion, and the other has a locking portion 4 for engaging with the expansive portion 3 in the axial direction and a sliding portion 5 opposed to the front end of the expansive portion 3 reciprocatively in the axial direction. The sliding portion 5 is arranged so as to be moved in the axial direction while abutting on the expansive portion 3 during the insertion of the male member 2 into the female member 1 and to be moved in opposition thereto during the engagement of the locking portion 4 with the expansive portion 3 to hold the expansive portion 3 between the sliding portion 5 and the locking portion 4 in the radial direction. Thus, in the state of connecting the female member 1 to the male member 2, the expansive portion 3 is held between the sliding portion 5 and the locking portion 4 in the radial direction, and so the expansive portion 3 is prohibited from being deformed with its diameter enlarged/shrunk and prevented from coming off from the locking portion 4. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a tool-free one-touch type pipe joint that can be connected by simply inserting a tube such as a tube or hose made of an elastic material such as synthetic resin or rubber, or a pipe made of a hard material.
Specifically, the present invention relates to a pipe joint that connects and connects a joint body and a conduit to each other by inserting a cylindrical female member attached thereto and a male member in the axial direction.

  Conventionally, as a pipe joint of this type, a male member to which a hose is connected is inserted into a socket fitting of a female member, and an engaging portion of a lock ring attached to the male member is connected to the inner periphery of the socket fitting. By contacting the chamfered portion of the locked portion formed on the surface, the outer diameter of the lock ring is reduced, and when the locking portion gets over the locked portion of the socket metal fitting, Due to the elasticity of the lock ring, the diameter of the lock ring is restored, the locking portion and the locked portion of the socket fitting are locked, and the male member is connected to the female member in a state in which the male member is prevented from coming off. In order to remove the male member, there is a member that can be pulled out by pressing the lock ring from both sides to reduce the outer diameter in reverse to the above (for example, see Patent Document 1).

JP 2008-25804 A (page 4-6, FIGS. 1, 4, 6 and 7)

However, in such a conventional pipe joint, the male member can be easily attached to and detached from the female member by the diameter reduction operation of the lock ring, but the lock ring is unexpectedly contracted when the female member and the male member are connected. When a force is applied in the diameter direction, the male member may come out of the female member.
By the way, a tool-free one-touch type pipe joint is particularly effective in places where connection work is difficult, such as the back of a ceiling, but if there is a risk that it will come off when an unexpected force is applied in a connected state as described above, There was a problem that it could not be used because it could develop into a large-scale accident such as leakage of water.

The first invention of the present invention aims to reliably prevent the male member from coming off from the female member.
Furthermore , it aims at flowing the fluid smoothly without resistance in the pipe.
Further , it is intended to realize a reliable locking operation with a single slide part.
The second invention is, in addition to the first inventions of interest is intended to check the connection state of the conduit visually.

To achieve the above object, the first invention of the present invention, and the fitting body, the tube, a conduit comprising a hose or a pipe, a tubular female member that is attached to the conduit, said fitting body A male member that is attached and fitted to the female member by insertion in the axial direction; and an expansion / contraction portion that is provided on the female member and elastically deforms in the radial direction as the male member is inserted into the female member ; wherein a locking portion provided on the male member engages to the scaling unit and the axial direction, and a slide portion that is provided to freely reciprocate in the axial direction to face the front end of the male member to the scaling unit, the A nipple connected to the male member so as to face the inner peripheral surface of the connection end of the conduit; and a sleeve connected to the female member so as to cover the outer peripheral surface of the connection end of the conduit; The slide part is formed in a cylindrical shape for expansion and contraction. Opened helically slit in the axial direction, the moving the relative female member in contact with the scaling unit due to the insertion of the male member those in the axial direction, opposite movement with the engagement of the locking portion and the scaling unit and, with sandwiching the radial direction the scaling unit between the locking portion and the sliding portion, characterized in that sandwich the connection end of the conduit to radially between said nipple sleeve Is .
The second invention, the first inventions of configuration, before Symbol scaling unit and the sleeve, and wherein the addition of structure forming notch a reduced diameter contouring slit extending in the axial direction.
A third invention is a tube or hose in which the conduit is made of an elastic material in the configuration of the first invention or the second invention, and a fastening member is attached to the outer periphery of the conduit with the sleeve interposed therebetween, The sleeve is reduced in diameter by a tightening force of a tightening member.
According to a fourth aspect of the present invention, in the configuration of the third aspect of the present invention, a cap that is detachably inserted into the opening of the conduit is provided.

According to the first aspect of the present invention, either the female member or the male member is provided with an expanding / contracting portion that elastically deforms in the radial direction upon insertion thereof, and the other is engaged with the expanding / contracting portion in the axial direction. And a sliding portion facing the tip of the expanding / contracting portion is provided so as to freely reciprocate in the axial direction, and the sliding portion abuts on the expanding / contracting portion as the male member is inserted into the female member. To move in the axial direction, and reversely move with the engagement of the expansion / contraction portion and the locking portion, so that the expansion / contraction portion is sandwiched in the radial direction between the slide portion and the locking portion. Thus, in the connected state of the female member and the male member, the expanding / contracting portion is sandwiched in the radial direction between the slide portion and the locking portion, and the expanding / contracting portion cannot be enlarged or deformed and detached from the locking portion. Absent.
Therefore, the male member can be reliably prevented from coming off from the female member.
As a result, accidents such as fluid leakage do not occur compared to the conventional one in which the male member is pulled out from the female member when a force is applied in the direction in which the diameter of the lock ring is unexpectedly reduced in the connected state of the female member and the male member, It is safe and is particularly effective in places where connection work is difficult, such as behind the ceiling.

In addition to the further, the scaling unit is arranged in the female member, by disposing the engaging portion and the sliding portion to the male member, the projections on the inner peripheral surface of the male member through which the fluid is formed smooth possible without.
Therefore, the fluid can flow smoothly without any resistance in the pipe.

In addition to the further, by opening the expansion slit formed in the cylindrical slide portion in the axial direction in a spiral shape, with the entire the slide portion is compressed and deformed in the axial direction with the abutment of the expansion portion, When the expansion / contraction portion engages with the locking portion and the contact with the slide portion is released, the slide portion expands and deforms, and the expansion / contraction portion is sandwiched in the radial direction between the expansion portion and the locking portion.
Therefore, a reliable locking operation can be realized with a single slide part.
As a result, the number of parts can be reduced, the entire structure can be simplified, and the manufacturing cost can be reduced.

The second invention is, in addition to the first inventions effects, the nipple is continuously provided on one of the female member and the male member, and continuously provided the scaling unit and the sleeve to the other, and these nipple and the sleeve By sandwiching the conduit between them and forming a slit for diameter reduction extending in the axial direction in the expansion / contraction part and the sleeve, the conduit becomes visible from the outside through the slit for diameter reduction.
Therefore, the connection state of the conduit can be visually confirmed.
As a result, even in places where it is difficult to perform piping work such as the ceiling, the pipe connection state can be easily confirmed by visual observation, which is very convenient.

  1 to 6, the embodiment of the pipe joint of the present invention includes a large-diameter cylindrical female member 1 attached to one of a joint body A or a conduit B such as a tube, a hose, or a pipe, A small-diameter cylindrical male member 2 attached to the other of the joint body A or the conduit B, an expansion / contraction portion 3 that is elastically deformable in a radial direction, provided on one of the female member 1 and the male member 2, and the female The expansion / contraction part 3 provided in the other of the member 1 and the male member 2 is provided with a locking part 4 that engages in the axial direction and a slide part 5 that can reciprocate in the axial direction.

  When the joint body A and the conduit B are connected to the pipe, the male member 2 is inserted into the female member 1 in the axial direction so that the expansion / contraction portion 3 is first elastically expanded or contracted in the radial direction. However, the front end abuts on the slide portion 5 to move the slide portion 5 in the insertion direction of the male member 2.

  Next, when the expanding / contracting portion 3 reaches a position facing the locking portion 4, the expanding / contracting portion 3 is restored by being contracted or expanded in diameter in the opposite direction in the radial direction, whereby at least the locking portion 4 and the male portion are restored. By engaging the female member 1 and the male member 2 in an opposite direction to the insertion direction of the member 2, the joint body A and the conduit B are connected to each other, and the expansion / contraction portion 3 is deformed in the radial direction. The slide portion 5 moves in the direction opposite to the insertion direction of the male member 2 so that the expansion / contraction portion 3 is sandwiched in the radial direction between the slide portion 5 and the male member 2 and the locking portion 4.

Further, either one of the female member 1 and the male member 2 is provided with a cylindrical nipple 6 having an outer diameter substantially the same as or slightly larger than the inner diameter of the conduit B, and the other is connected to the conduit. A cylindrical sleeve 7 having an inner diameter substantially the same as or slightly larger than the outer diameter of B is provided continuously, and the conduit B is sandwiched between the nipple 6 and the sleeve 7 so as to be immovable in the axial direction. It is preferable to do.
Embodiments of the present invention will be described below with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1 to 3, the male member 2 and the nipple 6 are connected to only one end side in the axial direction of the joint body A, and a locking portion is provided on the outer peripheral surface of the male member 2. 4, the slide portion 5 is provided so as to reciprocate in the axial direction so as to cover a part of the outer periphery of the male member 2 and the locking portion 4, and the expansion / contraction portion 3 and the sleeve 7 are provided on the female member 1. The sleeve 7 is inserted into the outer periphery of the connection end of the conduit B, and is attached so as not to move in the axial direction by an annular fastening member 8. The female member 1 and the expansion / contraction part 3 are arranged at the tip (referred to as “insertion direction”), and the other end in the axial direction of the joint body A is connected to a pipe connection port (not shown) of another device. The case where 9 is connected is shown.

  In the illustrated example, as shown in FIGS. 1B and 3A, the male member 2 and the nipple 6 are sequentially formed in the joint body A in the direction opposite to the tube insertion direction (hereinafter referred to as “anti-insertion direction”). On the outer peripheral surface of the male member 2, a concave locking portion 4 smaller than the outer diameter of the nipple 6 is formed in an inclined shape in which the outer diameter gradually increases toward the tube insertion direction. A cylindrical slide portion 5 is formed so as to be able to expand and contract in the tube insertion direction and the anti-insertion direction so as to face the male member 2 and the locking portion 4, and is inserted into the outer periphery of the joint body A.

  Further, as shown in FIGS. 1B and 3A, a fastening member 8 is attached to the outer periphery of the connection end of the conduit B with the sleeve 7 interposed therebetween. 7, the inner peripheral surface of the sleeve 7 is brought into close contact with the outer peripheral surface of the connecting end portion of the conduit B and is immovably assembled. The inner peripheral surfaces of the female member 1 and the expanding / contracting portion 3 are connected to the nipple. A convex portion 1a that is smaller than the outer diameter of 6 and fits with the concave locking portion 4 of the male member 2 is integrally formed in an inclined shape so that the inner diameter gradually increases toward the tube insertion direction.

  Although not shown as another example, the engaging portion 4 is formed on the outer peripheral surface of the male member 2 in a convex shape with the outer diameter gradually increasing toward the tube insertion direction, and the female member 1 and On the inner peripheral surface of the expansion / contraction part 3, it is also possible to form an inclined concave part having an inner diameter that gradually increases in the tube insertion direction so as to fit with the locking part 4.

  As shown in FIGS. 1 (b) and 3 (a), the slide portion 5 disposed so as to face the male member 2 and the locking portion 4 is made of, for example, polyacetal resin or other surface slipperiness and heat resistance. An elastically deformable material such as a synthetic resin having excellent properties, and is formed into a cylindrical shape having an inner diameter that fits the outer diameter of the expansion / contraction portion 3 when the diameter of the expansion / contraction portion 3 is reduced. As a result, it is possible to expand and contract in the axial direction as a whole.

  As another example of the slide portion 5, although not shown, an elastic body such as a spring spring is interposed between a plurality of cylindrical bodies so as to be able to expand and contract in the axial direction as a whole, or on the outer periphery of the joint body A. It is also possible to support the cylindrical body so that it can be reciprocated and pressed toward the female member 1 with an elastic body such as a spring.

  As a method of attaching the slide portion 5 to the joint body A, after the protrusion 5b and the groove 5c are formed in advance on the outer peripheral surface of the joint body A and the inner periphery of the slide portion 5 is inserted into the outer periphery of the joint body A, By mounting a stopper 5d such as a retaining ring in the concave groove 5c, the protrusion 5b and the stopper 5d are assembled so that the slide portion 5 is sandwiched and positioned in the axial direction.

  Further, when the joint body A, the male member 2 and the nipple 6 are integrated, as shown in FIGS. 1B and 3A, the whole is made of a cylindrical material made of metal or the like by, for example, cutting. It is formed into a thin cylindrical body by cutting it out or pressing a plate material made of a deformable rigid material such as stainless steel or other molding.

On the outer peripheral surface 6a of the nipple 6, a plurality or a single annular recess 6b extending in the circumferential direction is formed in the axial direction, and an annular seal material 6c that can be elastically deformed is fitted into the annular recess 6b so that it cannot move in the axial direction. While holding, the outer peripheral end of the annular sealing material 6 c is arranged to protrude from the outer peripheral surface 6 a of the nipple 6.
As another example, although not shown, it is also possible to form a plurality of annular protrusions and annular grooves in the shape of a bamboo slab that is alternately arranged in the axial direction.

  It is preferable to form a tapered surface 6d on the outer periphery of the tip of the nipple 6 so that its outer diameter gradually increases in the tube insertion direction so that the conduit B can be inserted easily.

  Further, when the female member 1, the expansion / contraction part 3 and the sleeve 7 are integrated, as shown in FIGS. 1 (b) and 3 (a), the whole is made to have, for example, polyacetal resin or other surface slipperiness. It is integrally molded with an elastically deformable material such as a synthetic resin having excellent heat resistance, and a plurality of diameter-reducing slits 3a extending in the axial direction from the opening end thereof are formed in the circumferential direction so as to be elastically deformed in the overall radial direction. It is easy to do.

  A concave groove portion 7a for positioning a fastening member 8 to be described later is formed in the outer peripheral surface of the sleeve 7, and the fastening member 8 is, for example, a spring as shown in FIG. Uses a so-called hose clamp that is elastically deformed in the radial direction while having an urging force to reduce the diameter by turning into an annular shape after cutting out an elastic material such as steel by punching or the like doing.

  The hose clamp 8 includes a clamp body 8a that is bent in an annular shape, and standing pieces 8b that are bent up at both ends of the clamp body 8a radially outward. By turning the upright pieces 8b at both ends so as to intersect in the circumferential direction, and by holding these upright pieces 8b with, for example, a tool or a finger, the clamp body 8a is expanded in diameter, The clamp body 8a is reduced in diameter by an elastic force from the expanded diameter state, and the upright pieces 8 are separated from each other.

  When such a hose clamp 8 is attached to the outer periphery of a tube or hose made of an elastic material as a conduit B, the deformable tube or hose peripheral wall is reduced in diameter by its elastic tightening force, so that the joint body In the state before the pipe connection to A, as shown in FIGS. 1A and 2A, the cap C is detachably inserted into the opening B1 of the tube or hose so as not to be crushed and deformed. It is preferable.

On the other hand, when the connecting tool 9 connected to the other axial end of the joint body A is provided with an internal threaded portion on the inner peripheral surface of the pipe connection port of another device connected to the pipe joint. The external screw portion 9a corresponding to this is engraved, and when the external screw portion is engraved on the outer peripheral surface of the pipe connection port, the corresponding internal screw portion is engraved.
In the case of the illustrated example, as shown in FIG. 3A, a nut having an external threaded portion 9a formed as the connection tool 9 is integrally formed at the end of the joint body A on the tube insertion direction side. .

Next, the pipe connection method of such a pipe joint will be described in the order of steps, and the effects obtained thereby will also be described.
First, as shown in FIGS. 1 (b) and 2 (b), the conduit B in which the sleeve 7 is assembled with the fastening member 8 to the male member 2 and the nipple 6 of the joint body A to which the slide portion 5 is assembled. When the connecting end portion is inserted, as shown in the solid line of FIG. 1C and FIG. 2C, the female member 1 connected to the sleeve 7 on the conduit B side and the convex portion 1a of the expansion / contraction portion 3 are The female member 1 and the expansion / contraction part 3 are expanded and deformed by abutting against the outer peripheral surface 6a of the nipple 6.

  If the conduit B is continuously inserted as it is, the tip of the expansion / contraction part 3 comes into contact with the slide part 5 as shown by a two-dot chain line in FIG. 1 (c), and thereafter, as shown by a solid line in FIG. 1 (d). The slide portion 5 is compressed and deformed in the tube insertion direction by the pressing by the tip of the expansion / contraction portion 3.

  As a result, the outer peripheral surface 6 a of the nipple 6 and the annular sealing material 6 c come into contact with the inner peripheral surface B 2 of the conduit B, and the inner peripheral surface B 2 of the conduit B passes through the sleeve 7 with the tightening force of the tightening member 8. The outer peripheral surface 6a and the annular sealing material 6c are in close contact with each other, and the space between them is sealed.

And when the convex part 1a of the female member 1 and the expansion / contraction part 3 reaches | attains the position which opposes the concave-shaped latching | locking part 4 of the male member 2 by the side of the coupling main body A as shown to the dashed-dotted line of FIG.1 (d), As shown in the solid line in FIG. 1D and FIG. 2D, the shape of the expansion / contraction portion 3 is reduced in diameter so as to return to the original shape before the expansion, and the concave engagement portion 4 of the male member 2 Engage in the anti-insertion direction.
Thereby, the female member 1 and the male member 2 are fitted to each other, the joint body A and the conduit B are connected, and both are prevented from coming off in the anti-insertion direction.

At substantially the same time, the contact with the slide portion 5 is released as the diameter of the expansion / contraction portion 3 is reduced, and the compression source of the slide portion 5 disappears. Therefore, as shown in FIGS. 1 (e) and 2 (e). The slide portion 5 is stretched and deformed in the anti-insertion direction, and the expansion / contraction portion 3 is sandwiched in the radial direction between the slide portion 5 and the male member 2 and the concave locking portion 4.
Thereby, since the expansion / contraction part 3 becomes impossible to expand the diameter, it does not come off from the concave locking part 4, and the male member 2 can be reliably prevented from coming off from the female member 1.
In addition, the completion of the connection between the female member 1 and the male member 2 can be visually confirmed by the extension deformation of the slide portion 5.

  Furthermore, in this embodiment, the expansion / contraction part 3 is disposed on the female member 1, the locking part 4 is provided on the outer peripheral surface of the male member 2, and the slide part 5 is disposed, so that the fluid is passed through the inner peripheral surface of the male member 2. Has the advantage that it can be formed smoothly without projections and the fluid flows smoothly without resistance in the tube.

  In addition, since the slit 5a for expansion and contraction extending spirally in the axial direction is opened in the cylindrical slide portion 5 and the entire slide portion 5 is compressed and deformed in the axial direction in accordance with the contact of the expansion and contraction portion 3, the slide The part 5 can be made into one component, and there is an advantage that the number of components can be reduced accordingly.

  Furthermore, the nipple 6 is connected to the male member 2, the expansion / contraction part 3 and the sleeve 7 are connected to the female member 1, and the conduit B is sandwiched between the nipple 6 and the sleeve 7, so that the female member 1 Since the diameter-reducing slit 3a extending in the axial direction is notched in the portion 3 and the sleeve 7, the conduit B can be viewed from the outside through the diameter-reducing slit 3a, and the connection state of the conduit B can be visually confirmed. .

  In the second embodiment, as shown in FIGS. 4 to 6, instead of providing the connector 7 at the other axial end of the joint body A, the male member 2 and the locking portion 4 are provided on both sides in the axial direction. Unlike the first embodiment shown in FIGS. 1 to 3, the configuration of the intermediate joint for connecting the two conduits B is different from that of the first embodiment shown in FIG. Is the same as that of the first embodiment shown in FIGS.

In the illustrated example, only one slide portion 5 is provided on the joint body A so as to reciprocate in the axial direction so as to cover a part of the outer periphery of the pair of male members 2 and the locking portion 4. One slide portion 5 sandwiches the pair of expansion / contraction portions 3 in the radial direction between the pair of male members 2 and the concave locking portion 4.
Although not shown as another example, it is also possible to provide the slide portion 5 so as to cover the pair of male members 2 and the locking portion 4.
Therefore, the second embodiment shown in FIGS. 4 to 6 can obtain the same operational effects as the first embodiment.

In the embodiment shown above, the male member 2 is attached to the joint body A, the locking portion 4 is provided on the outer periphery thereof, and the slide portion 5 is provided so as to cover a part of the outer periphery of the male member 2 and the locking portion 4. Is provided so as to be capable of reciprocating in the axial direction, and the female member 1 is attached to the outer periphery of the connecting end portion of the conduit B, and the expanding / contracting portion 3 is provided at the distal end of the female member 1 in the tube insertion direction. The male member 2 is attached to the connection end of the conduit B while the female member 1 is attached to the joint body A, or the locking portion 4 and the slide portion 5 are provided to the female member 1 while the expansion / contraction portion 3 is provided on the male member 2. Any other structural arrangement may be adopted as long as the expansion / contraction portion 3 is sandwiched in the radial direction between the slide portion 5 and the locking portion 4 in the connected state of the female member 1 and the male member 2.
Further, the sleeve 7 is inserted into the outer periphery of the connection end of the conduit B and is attached so as to be immovable in the axial direction by the annular fastening member 8. However, the present invention is not limited to this. The sleeve 7 may be integrally attached to the conduit B by means, and the tightening member 8 is not limited to the illustrated hose clamp, and other well-known tightening tools may be used.

It is a vertical side view which shows one Example of the pipe joint of this invention, (a) shows the time of insertion of a cap, (b) shows the state before insertion of a conduit | pipe, (c) is immediately after insertion of a conduit | pipe. The state is shown, (d) shows the state before the slide part is reversely moved, and (e) shows the connection state of the conduit. In the perspective view, (a) shows when the cap is inserted, (b) shows a state before insertion of the conduit, (c) shows a state immediately after insertion of the conduit, and (d) shows the state of the slide portion. The state before reverse movement is shown, and (e) shows the connection state of the conduit. (A) is the whole exploded perspective view, (b) is the perspective view which looked at the sleeve simple substance from the reverse direction. It is a vertical side view which shows the other Example of the pipe joint of this invention, (a) shows the state before insertion of a conduit | pipe, (b) shows the state immediately after insertion of a conduit | pipe, (c) is a slide part. The state before reverse movement is shown, and (d) shows the connection state of the conduit. In the perspective view, (a) shows a state before insertion of the conduit, (b) shows a state immediately after the insertion of the conduit, (c) shows a state before the slide portion is reversely moved, (d) shows The connection state of the conduit is shown. It is a whole exploded perspective view.

Explanation of symbols

A Joint body 1 Female member 1a Convex part 2 Male member 3 Expansion / contraction part 3a Diameter reduction slit 4 Locking part 5 Slide part 5a Expansion / contraction slit 5b Projection 5c Concave groove 5d Stopper 6 Nipple 6a Outer peripheral surface 6b Annular recess 6c Annular Sealing material 6d Tapered surface 7 Sleeve 7a Concave groove portion 8 Tightening member 8a Clamp body 8b Standing piece 9 Connection tool 9a External threaded portion B Conduit B1 Opening portion B2 Inner peripheral surface C Cap

Claims (4)

The fitting body ;
A conduit consisting of a tube, hose or pipe ;
A tubular female member that is attached to the conduit,
A male member attached to the joint body and fitted into the female member by insertion in the axial direction ;
An expansion / contraction part provided on the female member and elastically deforming in the radial direction along with the insertion of the male member into the female member ;
A locking portion provided on the male member and engaged with the expansion / contraction portion in the axial direction ;
A slide portion that is provided to freely reciprocate in the axial direction to face the front end of the male member to the scaling unit,
A nipple continuously connected to the male member so as to face the inner peripheral surface of the connecting end of the conduit;
A sleeve connected to the female member so as to cover the outer peripheral surface of the connection end of the conduit; and
The sliding portion is formed in a cylindrical shape stretching slit opened in the axial direction in a spiral shape, and the gain related the scaling unit and the contact with the insertion of the male member relative to the female member to move in the axial direction, the scaling parts and inversely moved with the engagement of the locking portion, together with the sandwich radially the scaling unit between the locking portion and the sliding portion, said conduit between said nipple sleeve A pipe joint characterized by sandwiching the connecting end portion in the radial direction . Before Symbol the scaling unit and the sleeve, according to claim 1 Symbol mounting tube joint, characterized in that the notches form a condensed diameter contouring slit extending in the axial direction. The conduit is a tube or a hose made of an elastic material, and a fastening member is attached to an outer periphery of the conduit with the sleeve interposed therebetween, and the sleeve is reduced in diameter by a fastening force of the fastening member. Item 3. A pipe joint according to item 1 or 2. The pipe joint according to claim 3, further comprising a cap that is detachably inserted into the opening of the conduit.

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