JPH09280433A - Pipe fittings - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To easily and quickly perform piping work, and to confirm the insertion amount when the pipe is mounted on the pipe joint without causing deformation of the pipe during the fastening work of the pipe and the pipe joint. Thus, a relatively inexpensive pipe joint is provided. SOLUTION: A main body 10 having a tubular portion into which an inner periphery of a pipe 5 is inserted is formed at an end portion, and a tubular member that is movably held in the axial direction at the end portion of the main body. The pressed member 30 that is pressed by the end surface of the member 5 and moves toward the main body, and the positional relationship with the main body is fixed when the pressed member 30 moves to a predetermined position with respect to the main body; A chuck ring 50 that fastens and seals the tubular portion and the tube, and at least one diameter reducing means 1 that reduces the diameter of the chuck ring 50 with the movement of the pressed tool 30 toward the main body.
The pipe joint 1 having 6 and 6.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pipe joint.

[0002]

2. Description of the Related Art Resin pipes, cross-linked polyethylene pipes and the like are used for construction of buildings and the like, and metal joints are often used for these joints. As the pipe joint as described above, for example, a chuck ring for fastening the outer periphery of the pipe joint body and the pipe is inserted into the end portion of the pipe joint body, and a taper surface is formed on the inner periphery of the outer periphery of the chuck ring. A joint is known in which the formed nut is tightened and the diameter of the chuck ring is reduced by the taper surface formed on the inner circumference of the nut so that the pipe surface and the pipe joint main body are pressure-connected to each other.

[0003]

However, in the above-described pipe joint, it is troublesome to connect the pipes because the nuts need to be tightened, and when a plurality of pipes are arranged in parallel, Since adjacent pipes interfere with each other during piping work, there is a problem that workability of nut tightening is poor.

In addition, there is a problem that the chuck ring may rotate with the rotation of the nut when the nut is tightened, which may deform or damage the tube.

Further, there is a problem that it is difficult to confirm the insertion amount when the pipe is attached to the pipe joint, and it is difficult to confirm whether or not the pipe and the pipe joint are securely fastened.

Further, since metal is used as the material of the pipe joint, there is a problem that the cost of the pipe joint becomes relatively high.

The present invention has been made in view of the above-mentioned conventional problems, and the piping work can be performed easily and quickly, and the pipe is not deformed when the pipe and the pipe joint are fastened.
It is easy to check the insertion amount when the pipe is attached to the pipe joint,
An object is to provide a relatively inexpensive pipe joint.

[0008]

The pipe joint according to the present invention comprises:
Cylindrical inner core part (18) inserted in the pipe (5)
A body (10) having an end portion formed thereon, and the body (10)
A tubular member that is movably held in the axial direction at the end of the pipe, is moved by the end face of the pipe (5) in the direction of the main body (10), and has a predetermined length with respect to the main body (10). The pressed tool (30) fixed to the main body (10) when moved to the position, and the pressed tool (3)
0) moves along with the movement of the main body (10) toward the main body (10), and the diameter can be reduced. A fastening member (50) for fastening and sealing the pipe (5), and the main body (1) of the pressed tool (30).
At least one diameter reducing means (16, 48) for engaging with the tightening member (50) and reducing the diameter of the tightening member (50) with the movement in the 0) direction.

The diameter reducing means (16) includes the body (1).
0) can be integrally formed.

The diameter reducing means (48) may be formed integrally with the inner circumference of the pressed tool (30).

A first diameter reducing means (16) is integrally formed with the main body (10) on the outer periphery of the inner core portion (18) of the main body (10), and a second diameter reducing means (48). May be integrally formed on the inner circumference of the pressed tool (30).

In the pipe joint according to the present invention, when the pipe is inserted into the main body, one end surface of the pipe presses the pressed member to move it toward the main body. With the movement of the pressed tool, the tightening member and the diameter reducing means are engaged with each other, and the tightening member is reduced in diameter.
As a result, the end of the main body and the end of the pipe are fastened to the tightening member and sealed. Then, the pressed tool is fixed to the main body at a predetermined position, and at the same time, the tightening member is also fixed to the main body, and the fitting of the pipe to the pipe joint is completed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a pipe joint according to the present invention will be described below in detail with reference to the drawings.

<Embodiment 1> FIG. 1 is a half sectional front view showing an embodiment of a pipe joint according to the present invention. In FIG. 1, the pipe joint 1 includes a main body 10, a pressed tool 30, a chuck ring 50, and a cover 60.

2A and 2B are explanatory views showing the structure of the main body 10. FIG. 2A is a left side view and FIG. 2B is a half sectional front view. As shown in FIG. 2, the main body 10 is a cylindrical member in which a flange portion 11, a male screw portion 20, and a hexagonal nut portion 21 are formed on the outer periphery, and a conduction hole 19 is formed in the axial direction. On the left side surface of the flange portion 11 in the drawing (b), a cylindrical inner core portion 18 forming a part of the conduction hole 19 so as to project in the axial direction is formed concentrically with the conduction hole 19. Outside the inner core portion 18, a taper surface 16 as a diameter reducing means is provided on the inner peripheral side, and a plurality of (six) strip-shaped strip portions 15 extending in the axial direction are arranged at equal intervals in the circumferential direction. The conductive holes 19 are formed concentrically. further,
On the outer side of the strip-shaped portion 15, a cylindrical outer cylindrical portion 12 is concentrically formed in the conduction hole 19. A male screw portion 13 for fastening with a cover 60 described later is formed on the outer peripheral side of the outer tubular portion 12. The inner circumference of the outer tubular portion 12 is a fitting surface 14 that fits with the outer circumference of the pressed tool 30 to be described later.

3A and 3B are a left side view (FIG. 3A), a half sectional front view (FIG. 3B) and a right side view (FIG. 3C) showing the structure of the pressed tool 30. . As shown in FIG. 3, the pressed tool 30 is a member having a cylindrical shape with a bottom, and the bottom wall portion 44 forming the bottomed portion is fitted to the outer periphery of the inner core portion 18 of the main body 10. A joint hole 45 is formed. An insertion port 36 into which a pipe to be mounted on the pipe joint 1 is inserted is formed at the opening end opposite to the fitting hole 45. The inner surface of the bottom wall portion 44 serves as a pressed portion 46 that is pressed by the end surface of the tube when the tube is inserted through the insertion port 36. The main body 10 is provided outside the fitting hole 45.
Guide holes 39 into which the strip-shaped portions 15 of
Are formed corresponding to each strip-shaped portion 15.

On the other hand, a plurality of (12) slits 31 extending in the axial direction are formed at equal intervals in the circumferential direction on the outer cylindrical portion. With this slit 31, a plurality of ring support piece portions 32 for supporting a chuck ring ring 50 described later are provided.
Also, a plurality of locking arms 40 are alternately formed.

A stopper 3 which engages with the inner periphery of a cover 60, which will be described later, is attached to the outer periphery of each of the ring support pieces 32 to prevent the pushed tool 30 from coming off after the pipe joint 1 is assembled.
3 are formed. The inner periphery of the insertion opening 36 in the axial direction is stepped, and a ring holding portion 37 that holds a chuck ring 50 described later is formed by this stepped formation. The side surface of the ring holding portion 37 is a ring pressing surface portion 38 that abuts the chuck ring 50. Further, the inner peripheral surface of the ring support piece portion 32 is a fitting surface 34 with which the outer peripheral surface of each of the strip-shaped portions 15 is fitted. A locking projection 41 having a taper portion 41a and a standing wall portion 41b is formed on the outer periphery of the locking arm 40, and engages with an inner peripheral portion of a cover 60, which will be described later, to establish a positional relationship with the main body. Play a role in fixing.

FIG. 4 is a side view (FIG. 4A) showing a structure of the chuck ring 50 and a front view of a half section (FIG. 4).
(B)). As shown in FIG. 4, the chuck ring 5
Reference numeral 0 is an annular member having a cutout portion 53 in the circumferential direction.
The outer periphery has a held surface 52 held by the ring holding portion 37 of the pressed tool 30 described above, and a taper as a diameter reducing means formed on the strip portion 15 of the main body 10 at one end. A tapered surface 51 that engages the surface 16 is formed. A pipe is inserted in the inner circumference, and when the diameter is reduced, a crease surface 54 is formed that bites the outer circumference of the pipe. The crease surface 54 is formed with irregularities that repeat in the axial direction.

FIG. 5 is a half sectional front view (FIG. 5A) and side view (FIG. 5B) showing the structure of the cover 60. As shown in FIG. 5, the cover 60 is a cylindrical member, and is formed on the outer periphery of the outer tubular portion 12 of the main body 10 at the opening of the inner periphery 61 on the right side of FIG. 5A. A female screw portion 65 that is fastened to the male screw portion 13 is formed. Further, a guide wall 62 having a diameter smaller than that of the inner circumference 61 is formed in the opening portion on the left side of FIG. The inner peripheral surface of the guide wall 62 serves as a guide hole 63 for guiding the outer periphery of the pressed tool 30. The inner side surface of the guide wall 62 has a standing wall portion 41b of a locking projection 41 formed on the outer circumference of the locking arm 40 of the pressed tool 30 and a stopper 33 formed on the outer circumference of the ring support piece portion 32. Is a locking surface 64 that restricts the movement of the pressed tool 30 in the axial direction.

As described above, the main body 10, the pressed member 30,
The pipe joint 1 including the chuck ring 50 and the cover 60 is assembled as follows. Pressed tool 3
The pressed tool 30 is fitted to the main body 10 while the chuck ring 50 is held by the zero ring holding portion 37. At this time, the strip-shaped portion 15 of the main body is inserted into the guide hole 39 of the pressed tool 30 in such a state that the strip-shaped portion 15 is fitted. As a result, the pressed tool 30 does not rotate with respect to the main body 10. In such a state, the cover 60 is mounted so that the outer circumference of the pressed tool 30 is inserted into the guide hole 63 of the cover 60, and the cover 60 is appropriately rotated to form a female member formed on the inner circumference of the cover 60. By fastening the screw portion 65 and the male screw portion 13 formed on the outer circumference of the outer cylindrical portion 12 of the main body 10, the cover 60 is fixed to the main body 10 and the assembly is completed.

Here, FIG. 1 shows a state where no pipe is attached to the pipe joint 1. In this state, the pressed tool 30 is axially guided by the guide hole 63 of the cover 60 and the strip-shaped portion 15 of the main body 10 inserted into its own guide hole 39, and is in a state of being movable in the axial direction. ing. When the pressed tool 30 is moved away from the main body 10, the stopper 33 of the pressed tool 30 causes the guide wall 6 of the cover 60 to move.
The contacting surface 64, which is the inner surface of the second member 2, comes into contact with the locking surface 64, so that the pressed tool 30 is prevented from coming off. On the other hand, when the pressed tool 30 is moved toward the main body 10 (more specifically,
When moved in the direction of the male screw portion 20 of the main body 10),
As shown in FIG. 6, among the locking projections 41 having the tapered portion 41 a and the standing wall portion 41 b formed on the outer periphery of the locking arm 40 of the pressed tool 30, the tapered portion 41 a is the guide wall of the cover 60. The inner peripheral corner portion 62a of 62 abuts. As a result, the movement of the pressed tool 30 toward the main body 10 is restricted. In addition, the to-be-pressed tool 3 is in a state where the pipe is not attached.
In order to move 0 toward the main body 10, the tapered surface 16 of the main body 10 and the tapered surface 51 of the chuck ring 50 engage with each other to reduce the diameter of the chuck ring 50. Axial pressing force is required.

However, when the taper portion 41a comes into contact with the inner peripheral corner portion 62a of the guide wall 62 and thereafter the pushed tool 30 is pushed toward the main body 10 with a further strong pressing force, the taper portion 41a of the locking arm 40 is formed. By engaging with the inner peripheral corner portion 62a of the guide wall 62 of the cover 60 and bending the locking arm 40, the pressed tool 30 can be further moved toward the main body 10.

Although FIG. 1 shows a state in which no pipe is attached to the pipe joint 1, FIGS. 7 and 8 show a state in which the pipe 5 is attached to the pipe joint 1. From the state of the pipe joint 1 shown in FIG. 1, a pipe 5 whose inner diameter matches the outer diameter of the inner core portion 18 of the main body 10 and whose outer diameter matches the inner diameter of the insertion port 36 of the pressed tool 30.
Insert When the tube 5 is inserted between the outer periphery of the inner core portion 18 of the main body 10 and the insertion opening 36 of the pressed tool 30, the end surface 5 a of the tube 5 contacts the pressed section 46 of the pressed tool 30. When the tube 5 is further pushed toward the main body 10, the pressed tool 30 also moves toward the main body 10. The chuck ring 50 held by the ring holding portion 37 of the pressed tool 30 moves along with the movement of the pressed tool 30.
Move toward 0. By this movement of the chuck ring 50, the tapered surface 51 formed on the outer peripheral end of the chuck ring 50 contacts the tapered surface 16 formed on the strip-shaped portion 15 of the main body 10.

When the tapered surface 51 of the chuck ring 50 and the tapered surface 16 of the strip-shaped portion 15 are in contact with each other and the chuck ring 50 is further moved toward the main body 10, the tapered surface 5
1 and the taper surface 16 are engaged with each other, the chuck ring 50
Gradually decreases in diameter. Due to the reduced diameter of the chuck ring 50, the outer circumference of the tube 5 is tightened by the chuck ring 50 and fastened to the outer circumference of the inner core portion 18 of the main body 10. At this time, the axial movement of the tube 5 (movement with respect to the inner core portion 18) is gradually regulated by the radial tightening due to the reduced diameter of the chuck ring 50, and is completely regulated by a predetermined movement amount. At this time, since the crease surface 54 is formed on the inner periphery of the chuck ring 50, the crease surface 54 is engaged with the outer peripheral portion of the tube 5, and the regulation force of the axial movement of the tube 5 is further strengthened.
At the same time, the tube 5 is fastened to the inner core portion 18, so that the tube 5 and the inner core portion 18 are also sealed.

On the other hand, when the pipe 5 is inserted in the direction of the main body 10, the tapered portion 41a formed on the outer periphery of the locking arm 40 of the pressed tool 30 described above has an inner peripheral corner portion 62a of the guide wall 62 of the cover 60. Abut. When the pressed tool 30 further moves toward the main body 10 in this state, the taper portion 41a of the locking projection 41 formed on the outer periphery of the locking arm 40 and the inner peripheral corner portion 62a of the guide wall 62 of the cover 60 are formed. Are engaged with each other to bend the locking arm 40, the locking projection 41 enters the inside of the guide wall 62, and the standing wall 41b of the locking projection 41 engages with the cover 60 as shown in FIG. It is locked by the stop surface 64. A gap is formed between the inner surface of the locking arm 40 and the outer surface of the tube 5 or the chuck ring 50 to allow the locking arm 40 to enter inside as described above. At this time, the to-be-pressed tool 30 has a chuck ring 5 whose ring pressing surface portion 38 is engaged with the tube 5.
0, and since the standing wall portion 41b of the locking projection 41 is locked by the locking surface 64 of the cover 60,
Axial movement is not possible. This completes the mounting of the pipe 5 on the pipe joint 1. As can be seen from FIGS. 7 and 8, when the mounting is completed, the pressed tool 30 and the cover 6 are
The one end surfaces 30a and 60a in the axial direction of 0 are located on the same plane.

Further, in the pipe joint 1 to which the pipe 5 is attached as described above, the pipe 5 is removed from the pipe joint 1 by rotating the cover 60 and separating it from the main body 10.

As described above, according to this embodiment, the pipe 5
When the fitting of the pipe 5 to the pipe joint 1 is completed, the axial one end surfaces 30a and 60a of the pressed tool 30 and the cover 60 are located on the same plane, so that the attachment of the pipe 5 to the pipe joint 1 is confirmed. It is possible to check the insertion amount of the tube 5 as well.

In addition, in this embodiment, the inner core portion 18 is formed on the main body 10 and the chuck ring 5 is formed.
Since the inner core portion 18 and the pipe 5 are fastened and sealed by 0, the pipe joint 1 does not require a seal member,
The cost can be reduced and the structure can be simplified. Since the structure is simple, airtightness or watertightness is improved when the pipe 5 is attached to the pipe joint 1.

Further, according to this embodiment, if the pipe 5 is inserted into the pipe joint 1 without being rotated, the attachment of the pipe 5 to the pipe joint 1 is completed. It is possible to prevent co-rotation of the chuck ring.

Further, the chuck ring 50 is the pressed member 30.
Along with the mounting of the tube 5, the relative positional relationship between the chuck ring 50 and the pressed tool 30 does not change. From this, the tube 5 is inserted, and the end surface 5a of the tube 5 is pushed.
At the time of contact with the pressed portion 46 of 0, the chuck ring 5
The relative positional relationship between 0 and the tube 5 is determined. Therefore, even if the diameter of the chuck ring 50 is reduced, the chuck ring 5
Almost no frictional force is generated in the axial direction between the inner peripheral surface 0 of the groove 0 and the pipe 5. Therefore, the outer peripheral surface of the tube 5 is not damaged.

The pipe joint 1 according to the present invention can be manufactured from a resin material, a metal material or the like, and when manufactured from a resin material, the product cost can be reduced.

<Embodiment 2> FIG. 9 is a half sectional front view showing another embodiment of the pipe joint according to the present invention. 9 and 1
The difference from the pipe joint 1 shown in and is that the pipe joint 1 shown in FIG.
As shown in FIG. 11, the pressed tool 30 has a tapered surface 48 as a diameter reducing means for reducing the diameter of the chuck ring 50 between the insertion hole 36 on the inner circumference of the ring supporting piece portion 32 and the ring holding portion 37. That is what I formed. Further, as shown in FIG. 10, in order to engage the chuck ring 50 with the tapered surface 48 formed on the pressed tool 30, in addition to the tapered surface 51 formed on one end of the outer periphery, A tapered surface 55 is formed at the other end of the outer circumference.

That is, in the pipe joint 1 of FIG. 9, the diameter of the chuck ring 50 is reduced by the two diameter reducing means of the tapered surface 48 and the tapered surface 16 formed on the strip-shaped portion 15 of the main body 10.

When the pipe 5 is inserted into the inner core portion 18 of the main body 10 and pressed in the state shown in FIG.
Moves toward the main body, and the ring holding portion 37 of the pressed tool 30 is moved.
The chuck ring 50 held by the pressing tool 30
Together with this, it moves in the direction of the body 10. Chuck ring 50
When the tapered surface 51 of the above-mentioned contacts the tapered surface 16 of the main body 10, the relative positional relationship between the pressed tool 30 and the chuck ring 50 starts to change. Then, the pressed object 30
The tapered surface 48 and the tapered surface 55 of the chuck ring 50 contact each other. From this state, when the pressed tool 30 is further pressed by the tube 5 toward the main body 10, the chuck ring 5
The taper surface 51 of 0, the taper surface 16 of the main body 10, the taper surface 48 of the pressed tool 30, and the taper surface 55 of the chuck ring 50 are engaged with each other to reduce the diameter of the chuck ring 50.

As a result, the inner core portion 1 of the main body 10
8 and the pipe 5 are fastened and sealed, and the axially one end surfaces 30a and 60a of the pressed tool 30 and the cover 60 are located on the same plane as in the pipe joint 1 of FIG. The state is set and the mounting is completed. In addition,
The ring pressing surface portion 38 of the inner circumference of the pressed tool 30 in a state where the mounting is completed can be formed so as to abut one end portion of the chuck ring 50, and when formed in this manner, the ring pressing surface portion 38 in the axial direction of the chuck ring 50 can be formed. Restrictions on movement will be tightened.

As described above, the two diameter reducing means, the tapered surface 48 and the tapered surface 16 formed on the strip-shaped portion 15 of the main body 10, are used to reduce the diameter at both ends of the outer periphery of the chuck ring 50. Therefore, the diameter of the chuck ring 50 is made uniform in the axial direction. Therefore, the fastening force between the pipe 5 and the main body 10 is increased, and the sealing becomes more reliable.

FIG. 12 is a half sectional front view showing still another embodiment of the pipe joint according to the present invention. The pipe joint 1 shown in FIG. 12 differs from the pipe joint 1 shown in FIG. 1 in that a tapered surface as a diameter reducing means is formed only on the inner circumference of the pressed tool 30. Therefore, as shown in FIG.
A taper surface is not formed at the tip of the inner periphery of the strip-shaped portion 15 of the main body 10, and the front end surface 15a of the strip-shaped portion 15 contacts the end surface of the chuck ring 50 and the axial direction of the chuck ring 50 (main body). It is a surface that regulates movement in 10 directions).

With the pipe joint 1 having such a structure, substantially the same operation and effect as the pipe joint 1 shown in FIG. 1 can be obtained.

<Embodiment 3> FIG. 14 is a front view of a half section showing a pipe joint according to still another embodiment of the present invention. The pipe joint 1 shown in FIG. 14 is different from the pipe joint 1 shown in FIG. 1 in that a member having a diameter reducing means for reducing the diameter of the chuck ring 50 is newly provided. That is, neither the main body 10 nor the pressed tool 30 is formed with a tapered surface which is a diameter reducing means, and the tubular member 70 having the tapered surface 70 formed on the inner circumference as shown in FIG. 15 is pressed. It is provided on the inner circumference of. The tubular member 70 is in contact with the end surface of the strip-shaped portion 15 of the main body 10. With such a structure, substantially the same operation and effect as the pipe joint 1 shown in FIG. 1 can be obtained.

Further, generally, it is troublesome to process the tapered surface on the inner periphery of the pressed tool 30 and the inner periphery of the strip-shaped portion 15 of the main body, which leads to an increase in product cost. However, since the tubular member 70 having the tapered surface on the inner periphery as shown in FIG. 15 is relatively easy to manufacture, the number of parts is increased, but the product cost can be reduced as a result. In the pipe joints shown in FIGS. 9 and 12, the tapered surfaces 16 and 48 can be formed by separate members.

[0042]

As described above, according to the pipe joint of the present invention, when the pressed tool moves to a predetermined position with respect to the main body when the pipe is inserted into the pipe joint, the pressed tool and the main body. Since the fitting of the pipe to the pipe joint is completed in a state where the positional relationship between and is fixed, it is easy to confirm the completion of the fitting, and the insertion amount can also be confirmed easily.

Further, since the pipe can be mounted on the pipe joint by inserting the pipe in the axial direction of the pipe joint and pressing the pipe joint, the ring-shaped tightening member does not rotate and the outer circumference of the pipe is damaged,
It can be prevented from being deformed.

Since the pipe is fastened to the main body by the ring-shaped fastening member and the pipe and the pipe joint main body are simultaneously sealed, the pipe can be attached to the main body in a highly airtight or watertight state. it can.

Further, as described above, since the pipe is fastened to the main body by the ring-shaped fastening member and the sealing of the pipe and the pipe joint main body is performed at the same time, a new seal member is not required and the structure is improved. It is simplified and the product cost can be suppressed. In addition, in the pipe joint in which the diameter reducing means is arranged on both sides in the axial direction of the chuck ring,
The diameter of the chuck ring is made uniform in the axial direction,
There is an advantage that the sealing is more reliable.

[Brief description of drawings]

FIG. 1 is a front view in half section showing an embodiment of a pipe joint according to the present invention.

2 is a side view (FIG. 2 (a)) and a half-section front view (FIG. 2 (b)) showing the structure of the main body of the pipe joint shown in FIG.
It is.

FIG. 3 is a left side view (FIG. 3 (a)) showing a structure of a pressed tool in the pipe joint shown in FIG.
(B)) It is a right view (FIG.3 (c)).

4A and 4B are a side view (FIG. 4A) and a half sectional front view (FIG. 4B) showing a structure of a chuck ring in the pipe joint shown in FIG.

5 is a front view (FIG. 5A) and a side view (FIG. 5) of a half section showing a structure of a cover in the pipe joint shown in FIG.
(B)).

FIG. 6 is a front view in half section showing the relationship between the cover and the locking projections in the pipe joint shown in FIG.

7 is a front view in half section showing a state in which a pipe is attached to the pipe joint shown in FIG.

FIG. 8 is a front view in half section showing a state in which a pipe is attached to the pipe joint shown in FIG.

FIG. 9 is a front view in half section showing another embodiment of the pipe joint according to the present invention.

10 is a front view in half section showing the structure of a chuck ring in the pipe joint shown in FIG.

FIG. 11 is a front view, in half section, showing the structure of the pressed tool in the pipe joint shown in FIG. 9.

FIG. 12 is a front view in half section showing another embodiment of the pipe joint according to the present invention.

13 is a front view in half section showing the structure of the main body of the pipe joint shown in FIG.

FIG. 14 is a front view in half section showing another embodiment of the pipe joint according to the present invention.

15 is a side view (FIG. 15 (a)) and a half-section front view (FIG. 15 (a)) showing a structure of a tubular member in the pipe joint shown in FIG.

[Explanation of Codes] 1 Pipe joint 5 Pipe 10 Main body 11 Flange portion 12 Outer cylinder portion 13 Male screw portion 14 Fitting portion 15 Strip portion 16 Tapered surface 18 Inner core portion 19 Conducting hole 20 Male screw portion 21 Hexagon nut portion 30 Pressed tool 30a End surface 31 Slit 32 Ring support piece 33 Stopper 34 Fitting part 36 Insertion hole 37 Ring holding part 38 Ring pressing surface part 39 Guide hole 40 Locking arm 41 Locking protrusion 41a Tapered part 41b Standing wall part 44 Bottom wall portion 45 Fitting hole 46 Pressed portion 50 Chuck ring 51, 55 Tapered surface 52 Outer peripheral surface 53 Notch portion 54 Streak surface 60 Cover 60a End surface 61 Inner periphery 62 Guide wall 63 Guide hole 64 Locking surface 65 Female screw portion 70 Cylindrical member 70a Tapered surface

Claims (2)

[Claims] 1. A main body (10) having a tubular inner core portion (18) inserted into a pipe (5) at an end thereof, and axially movable at the end of the main body (10). A tubular member held by the body (5), which is pressed by an end surface of the pipe (5) to move in the direction of the body (10) and moves to a predetermined position with respect to the body (10). The pressed member (30) fixed to (10) and the pressed member (30) move along with the movement of the pressed member (30) in the direction of the main body (10), and the diameter can be reduced, and A tightening member (50) for tightening the outer periphery of the tube (5) to tighten and seal the inner core portion (18) of the body (10) and the tube (5), and the body of the pressed tool (30). Engages with the tightening member (50) as it moves in the (10) direction. The clamping pipe joint having at least one reduced diameter section (16,48) for reducing the diameter of the member (50). 2. A first diameter reducing means (16) is provided on the main body (1).
0) around the inner core portion (18) of the main body (1
0) The pipe fitting according to claim 1, wherein the second diameter reducing means (48) is integrally formed with the inner circumference of the pressed tool (30).