JP2002098276A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint capable of easily connecting pipes, having the high locking force to a male pipe and capable of showing the stabilized seal performance even if unevenness of the outer diameter dimension of the male pipe exists. SOLUTION: This joint is provided with a female pipe 2 as a connector main body, a sleeve 4 inserted into the inner periphery of the female pipe 2, and a male pipe 3 to be inserted into the inner periphery of the sleeve 4. The inner peripheral surface of the female pipe 2 is formed with a first taper surface 2d having a diameter gradually increased toward the depth, and the sleeve 4 holds plural bead-like pieces 5 in the circumferential direction with a nearly ring-like wire 6 inserted into the piece 5. The sleeve 4 is energized outside in the axial direction in relation to the female tube 2 so that the piece 5 pressure-contact between the first taper surface 2d and the peripheral surface of the male pipe 3 so as to stop a fall of the male pipe 3 from the female pipe 2. The inner peripheral surface of the female pipe 2 on a depth side of the first taper surface 2d is formed with a second tapered surface 2e having a diameter gradually increased toward the depth. A packing 7 having the inner peripheral surface to be brought into contact with the tapered outer peripheral surface 7c brought in contact with the second tapered surface 2e and the peripheral surface of the male pipe 3 is installed in a tip of the sleeve 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint which can be used for joining water pipes and the like.

[0002]

2. Description of the Related Art Conventionally, pipe joints with female threads are generally used for joining works such as pipes buried in waterworks. That is, a male screw is formed at the end of the pipe, and the male screw is screwed into the female screw of the pipe joint to join the pipe. However, in the case of such a joining method by screwing, it is necessary to form an external thread at the end of the pipe in advance, and it takes time and effort to process and also takes a great deal of time to join on site. There were drawbacks.

To solve such a problem, as described in Japanese Patent Application Laid-Open No. 2000-179767, a female pipe serving as a pipe joint body, a sleeve inserted into the inner periphery of the female pipe, and a A male pipe inserted into the circumference, a tapered surface having a gradually increasing diameter on the inner side is formed on the inner peripheral surface of the female pipe, and a plurality of bead-like pieces are inserted through the pieces in the sleeve. It is held in the circumferential direction by a ring-shaped wire, and by urging the sleeve axially outward with respect to the female tube, the top is pressed between the tapered surface and the outer peripheral surface of the male tube, thereby turning the male tube into the female tube. On the other hand, a pipe joint that prevents the pipe from coming off has been proposed. When this pipe joint is used, there is no need to pre-process a male screw on the end of the male pipe, and it is only necessary to insert the male pipe into the female pipe at the time of joining, so that there is an advantage that the joining operation is simplified. In addition, since the bead-shaped top is inserted and supported by the wire, it can be greatly protruded from the opening of the sleeve toward the inner diameter side. Therefore, there is an advantage that a large allowance for engagement between the top and the male tube can be obtained, and the locking force with respect to the male tube increases.

[0004]

In the case of the above-described pipe joint, the sealing property between the male pipe and the female pipe is ensured by a sealing member such as an O-ring fitted on the inner surface of the female pipe. However, in general, the outer diameter of the male pipe varies, and if the male pipe varies to the small diameter side, the sealing force of the O-ring is reduced, which may cause a problem such as water leakage. For this reason, the O-ring is selected to have such a size that the sealing performance can be ensured even when a male pipe with a minimum diameter is used. However, when a male pipe with a large outer diameter is inserted, it is very difficult to insert the O-ring. O-ring is easily damaged. As described above, in the conventional pipe joint using the O-ring, it is difficult to secure stable sealing performance against variations in the outer diameter of the male pipe.

Accordingly, an object of the present invention is to provide a pipe joint which can be easily joined, has a high engaging force with respect to a male pipe, and can exhibit a stable sealing performance against variations in the outer diameter of the male pipe. It is in.

[0006]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 provides a female pipe as a pipe joint body, a sleeve inserted into the inner circumference of the female pipe, and an inner circumference of the sleeve. A first tapered surface having a gradually increasing diameter on the inner side is formed on the inner peripheral surface of the female tube, and a plurality of bead-like pieces are inserted through the pieces in the sleeve. The sleeve is held in the circumferential direction by a substantially ring-shaped wire, and the sleeve is urged axially outward with respect to the female pipe, whereby the top is pressed between the first tapered surface and the outer peripheral surface of the male pipe. In the pipe joint for retaining the male pipe from the female pipe with respect to the female pipe, a second tapered surface having a gradually increasing diameter on the deep side is formed on the inner peripheral surface on the deep side of the first tapered surface of the female pipe. And a tapered outer peripheral surface that is formed and is in contact with the second tapered surface at a tip end of the sleeve. To provide a pipe joint, characterized in that packing having an inner peripheral surface in contact with the outer peripheral surface of Kieu tube is mounted.

[0007] In the present invention, the bead-shaped top is inserted into the wire, and the wire is engaged with the outer or inner circumference of the sleeve, thereby holding the top in the circumferential direction with respect to the sleeve. When the sleeve is inserted into the female tube and the male tube is inserted therein, the top comes into contact with the first tapered surface of the female tube and the outer peripheral surface of the male tube. Here, when the sleeve is urged outward in the axial direction of the female tube, the top is pressed in the inner diameter direction by the first tapered surface, and the top comes into pressure contact with the outer peripheral surface of the male tube. Since the top is inserted and supported by the wire, the top can protrude greatly from the sleeve toward the inner diameter side. for that reason,
A large allowance for engagement between the top and the male pipe is obtained, and the locking force on the male pipe increases. Also, by urging the sleeve outward in the axial direction, the top comes into pressure contact between the first tapered surface and the outer peripheral surface of the male pipe, and at the same time, the packing attached to the tip of the sleeve has the second tapered surface. As a result, it can be pressed against the outer peripheral surface of the male pipe. Therefore, the inner diameter of the packing can be set to a size corresponding to the maximum diameter male pipe, and the insertion of the male pipe is easy, and the gap between the male pipe and the female pipe can be reliably sealed.

As means for urging the sleeve outward in the axial direction of the female tube, a spring may be used, or a flange portion is provided at a portion protruding outside the sleeve, and the flange portion and the end portion of the female tube are provided. And a jack mechanism using a screw or a rotary lock mechanism may be provided. When a jack mechanism using a screw is used, a large pulling force is applied to the sleeve by the pushing force of the screw, so that the top is securely inserted between the first tapered surface and the outer peripheral surface of the male pipe. It can be pressed. That is, even if some external force acts on the sleeve inward, the sleeve does not move, and the top does not separate from the first tapered surface. Therefore, the male pipe can be strongly locked.

It is desirable that the packing be mounted on the distal end of the sleeve so as to be movable in the axial direction by a predetermined distance. That is, when the sleeve is moved outward in the axial direction to lock the female pipe and the male pipe, the top is moved to the first position.
Although the pressure contact is made between the tapered surface and the male pipe, the position of the sleeve at that time is not constant due to variations in the outer diameter of the male pipe. When the packing is fixed to the sleeve, the packing is pressed against the second tapered surface more strongly than necessary to reduce the durability of the packing, or conversely, the pressing force between the packing and the second tapered surface is insufficient. There is a possibility that the sealing property is reduced. Therefore, by mounting the packing so that it can move in the axial direction with respect to the sleeve, even if the position of the sleeve changes due to variations in the outer diameter of the male pipe, the packing contacts the second tapered surface with an appropriate pressure contact force. Stable at the position where you do.
Then, since the packing is pushed in the direction of the second tapered surface of the female pipe by the water pressure of the water flowing in the male pipe, the packing reliably seals the gap between the female pipe and the male pipe, thereby preventing water leakage.

According to a third aspect of the present invention, an engagement groove is formed on the inner peripheral surface of the packing, and the engaging groove is formed on the outer peripheral surface of the distal end portion of the sleeve to prevent the packing from coming off in the axial direction. It is desirable to form pawls. That is, by making the packing detachable from the sleeve, when the packing is deteriorated, only the packing can be replaced. Further, since the locking claw of the sleeve is engaged with the inner circumferential engagement groove of the packing, the pressing force between the tapered outer peripheral surface of the packing and the second tapered surface does not decrease.

[0011] According to a fourth aspect of the present invention, a stopper surface is formed on the inner peripheral surface of the female pipe at a position deeper than the second tapered surface to limit the movement of the packing to the rear, and the packing is formed on the inner peripheral surface of the female pipe. It is desirable that the engagement claw be automatically engageable with the engagement groove of the packing by inserting the sleeve into the female pipe in the fitted state. In other words, when trying to insert the sleeve into the female tube with the packing attached to the distal end of the sleeve, the packing may not bend inward and the sleeve may not be inserted smoothly into the female tube. There is. On the other hand, if only the packing is fitted in the female tube in advance, and the sleeve is later inserted to engage the locking claw of the sleeve with the engaging groove of the packing, the assembly can be easily performed. . When the sleeve is inserted, there is a possibility that the packing moves to the back and the engaging claw and the engaging groove do not properly engage. For this reason, by forming a stopper surface on the inner peripheral surface of the female tube at a position deeper than the second tapered surface, movement of the packing toward the rear is restricted, and the locking claw and the engaging groove are properly engaged. Can be done.

[0012]

1 to 7 show a first embodiment of a pipe joint according to the present invention. The pipe joint 1 of this embodiment includes a female female pipe 2 serving as a pipe joint main body, and is used to connect two male pipes 3. Since the female tube 2 has a symmetrical structure, only the structure at one end will be described below.

The inner surface of the female pipe 2 has two concave grooves 2a, 2b.
Are formed. The outer first groove 2a and the inner second groove 2b are formed adjacent to each other with a partition wall 2c therebetween. At the outer end of the first groove 2a, there is formed a first tapered surface 2d having a gradually increasing diameter on the inner side, and at the outer end of the second groove 2b, a second taper having a gradually increasing diameter on the inner side. The surface 2e is formed. A stopper surface 2f that restricts the later-described movement of the packing 7 is formed behind the second tapered surface 2e of the second groove 2b.

A sleeve 4 is inserted into the inner circumference of the female pipe 2 so as to be movable in the axial direction. As shown in FIGS. 3 to 5, the sleeve 4 is formed of a material having a hardness such as a metal material or a resin and is formed in a cylindrical shape. A peripheral groove 4a is formed. At the bottom of the peripheral groove 4a, a plurality of openings 4b penetrating the inner and outer peripheries are formed at equal intervals in the circumferential direction (8 in this embodiment).
Pieces) are formed. The circumferential length of the opening 4b is longer than the axial length of the top 5 described later, and the radial depth (thickness of the sleeve 4) of the opening 4b is set smaller than the diameter of the top 5. At one end of the sleeve 4, an outward locking claw 4c is formed all around.
Is detachably engaged with an engagement groove 7b formed on the inner peripheral surface of the packing 7. The other end of the sleeve 4 is a female tube 2
And a flange portion 4d projecting in the outer diameter direction is formed on the projecting portion.

A bead-shaped top 5 is fitted into each of the openings 4b of the sleeve 4, and movement in the axial direction and the circumferential direction is restricted. A part of the top 5 projects in the radial direction of the opening 4b. The top 5 is formed of a metal material having a high hardness, and has a through hole 5a penetrating in the axial direction as shown in FIG. The shape of the top 5 may be spherical, but in this embodiment, the top 5 is formed in a barrel shape to increase the contact area with the first tapered surface 2d. It is desirable to provide knurls 5b parallel to the axial direction on the outer surface. A substantially ring-shaped metal wire 6 is inserted into the through hole 5a.
Is inserted, and the wire 6 is fitted in the circumferential groove 4 a of the sleeve 4. The top 5 is rotatable with respect to the wire 6 and is slidable in the circumferential direction. Note that the wire 6 may have an endless circular shape, but the wire 6 of this embodiment is formed in a substantially C-shape with both end portions overlapping (see FIG. 3). In the case of a C-shape, both ends may be bent and locked to the sleeve 4 without overlapping both ends. In this embodiment, the inner diameter of the wire 6 is formed smaller than the outer diameter of the groove bottom of the peripheral groove 4a of the sleeve 4 in the free state, and the wire 6 is supported on the groove bottom of the peripheral groove 4a of the sleeve 4.

A packing 7 having a sectional shape shown in FIG. 7 is attached to the distal end of the sleeve 4. The packing 7 is formed in a ring shape by elastic rubber.
In the second groove 2b. A seal 7a having a circular cross section is formed at one end of the packing 7, and an engagement groove 7b that engages with the locking claw 4c of the sleeve 4 is formed at the inner periphery of the other end. The locking claw 4c and the engagement groove 7b are movably engaged in the axial direction by a predetermined distance S (see FIG. 2). The outer periphery of the other end of the packing 7 is provided with a tapered outer peripheral surface 7 c that can make surface contact with the second tapered surface 2 e of the female pipe 2. The inner diameter of the seal portion 7a is preferably set to a size that allows insertion even if the outer diameter of the male pipe 3 varies to the maximum size.
This can prevent the seal portion 7a from being damaged when the male pipe 3 is inserted.

In this embodiment, the seal portion 7a has a substantially circular cross section, but may have a Y-shaped or V-shaped cross section as shown in FIG. As shown in FIG. 7, the sealing portion 7a has a circular cross section.
When the male pipe 3 is inserted into the female pipe 2, the male pipe 3 can be inserted smoothly from either of the left and right directions. When the male pipe 3 is inserted from the right side in FIG. 8, the case where the seal portion 7a having the Y-shaped cross section is provided as shown in FIG.

A fixing screw 8 for urging the sleeve 4 outward in the axial direction of the female pipe 2 is provided on the flange portion 4d of the sleeve 4.
Is formed with a screw hole 4e. In this example,
Two screw holes 4e are provided at 180-degree symmetric positions.
When the fixing screw 8 is screwed in the female pipe direction, the distal end face of the fixing screw 8 comes into contact with the end face of the female pipe 2, and the flange portion 4 d and the female pipe 2
The distance L from the end surface of the sleeve 4 increases, and the sleeve 4 is urged outward in the axial direction.

Here, a method of locking the male pipe 3 with respect to the female pipe 2 will be described. First, the top 5 and the wire 6 are integrally assembled with the sleeve 4. Therefore, first, the wire 6 is inserted into the top 5, and the wire 6 is fitted into the circumferential groove 4 a of the sleeve 4, and the top 5 is fitted into the opening 4 b of the sleeve 4. Since the inner diameter of the wire 6 is equal to or smaller than the outer diameter of the groove bottom of the peripheral groove 4a of the sleeve 4 in the free state, the wire 6 is stably supported on the groove bottom of the peripheral groove 4a of the sleeve 4. . In this way, since the sleeve 4, the top 5 and the wire 6 are integrally assembled, the top 5 is
It is easy to handle without falling off.

Next, the sleeve 4 on which the top 5 is mounted is inserted into the female tube 2, but before that, the packing 7 is inserted.
Into the second concave groove 2b of the female pipe 2. Packing 7
Is made of elastic rubber, so that it can be easily fitted. When the sleeve 4 is inserted into the female tube 2 in which the packing 7 is fitted, the top 5 projecting from the sleeve 4 in the outer diameter direction hits the inner peripheral edge of the female tube 2. Here, when the sleeve 4 is strongly pushed, a part of the wire 6 is bent and the
Is displaced toward the inner diameter side, so that the top 5 can sink into the inner peripheral side of the female pipe 2 and the sleeve 4 can be inserted. When the sleeve 4 is further pushed in, the top 5 gets over the entrance of the female pipe 2 and fits into the first groove 2a. Here, since the top 5 projects in the outer diameter direction due to the elasticity of the wire 6, the top 5
Is in contact with the first tapered surface 2d, and the sleeve 4 is prevented from coming off. When the sleeve 4 is inserted all the way, the locking claw 4c provided at the tip of the sleeve 4 automatically engages with the inner circumferential engagement groove 7b of the packing 7, and the packing 7 is mounted on the sleeve 4. At this time, the packing 7 is pushed by the sleeve 4 and attempts to escape to the back. However, since the stopper surface 2f is formed in the back of the second concave groove 2b of the female pipe 2, the escape of the packing 7 is restricted. Thus, the locking claw 4c can be reliably engaged with the engagement groove 7b.

When the male tube 3 is inserted into the female tube 2 to which the sleeve 4 has been assembled as described above, the diameter of an envelope circle connecting the inner peripheral surfaces of the plurality of pieces 5 is smaller than the outer diameter of the male tube 3. Then, the outer peripheral surface of the male pipe 3 comes into contact with the top 5 projecting in the inner diameter direction from the inner peripheral surface of the sleeve 4. Then, as the male tube 3 is inserted, the wire 6 that has inserted and supported the top 5 is slightly expanded. However, since the top 5 rotates while contacting the male tube 3, the male tube 3 is inserted smoothly. Also, sleeve 4
The packing 7 attached to the tip of the sleeve 7 is movable in the axial direction by a predetermined distance S with respect to the sleeve 4, so that even if the packing 7 comes into strong contact with the Since the male pipe 3 escapes to the large diameter side of the tapered surface 2e, the male pipe 3 can be inserted smoothly.

After the male tube 3 is inserted to the end, the fixing screw 8 screwed to the flange portion 4d of the sleeve 4 is turned in the tightening direction, and the tip surface of the fixing screw 8 is brought into contact with the end surface of the female tube 2. The distance L between the flange 4d and the end face of the female pipe 2 increases, and the sleeve 4 is pulled outward in the axial direction. Therefore, the top 5 is also pulled outward in the axial direction integrally with the sleeve 4, and the top 5 is pushed in the inner diameter direction by the first tapered surface 2 d of the female pipe 2. As a result, the top 5 bites into the outer peripheral surface of the male pipe 3 and the female pipe 2 and the male pipe 3 can be strongly locked. In particular, the outer peripheral surface of the top 5 is formed in a barrel shape,
If the knurls 5b in the axial direction are formed on the peripheral surface, the locking force is further increased. Therefore, even if a large tensile force acts on the male pipe 3, the male pipe 3 can be reliably prevented from coming off.

When the sleeve 4 is moved outward in the axial direction by the fixing screw 8, the packing 7 attached to the distal end of the sleeve 4 is also pulled outward in the axial direction, and the tapered outer peripheral surface 7c becomes the second outer surface. It contacts the tapered surface 2e. Therefore, the seal portion 7 a of the packing 7 is pressed and shrunk in the inner diameter direction, and the inner peripheral surface of the seal portion 7 a is strongly pressed against the outer peripheral surface of the male pipe 3. As a result, the gap between the female pipe 2 and the male pipe 3 can be reliably sealed, and even if high-pressure tap water flows through the male pipe 3, water leakage can be reliably prevented. When the sleeve 4 is moved in the locking direction (outward in the axial direction), the packing 7 is pressed against the second tapered surface 2e more strongly than necessary or the pressing force is insufficient due to variation in the outer diameter of the male pipe 3. The engagement groove 7b of the packing 7 and the locking claw 4 of the sleeve 4
Since c is movable by a fixed distance S in the axial direction, the packing 7 automatically moves to the small diameter side of the second tapered surface 2e by the water pressure of the water flowing through the male pipe 3 (indicated by a broken line in FIG. 2). ), The tapered outer peripheral surface 7c can be pressed against the second tapered surface 2e with an appropriate force. For this reason, an unnecessary load does not act on the packing 7, and an appropriate sealing force can be exhibited.

When it is necessary to remove the male pipe 3 from the female pipe 2, first, the fixing screw 8 screwed to the flange portion 4 d of the sleeve 4 is loosened, and the sleeve 4 is pushed into the female pipe 2. As a result, the top 5 held by the sleeve 4 also moves to the inner side of the female tube 2 and separates from the first tapered surface 2d, and at the same time, the packing 7 attached to the distal end of the sleeve 4 moves.
Also moves away from the second tapered surface 2e. Therefore, the lock between the top 5 and the male pipe 3 is released, and the pressure contact of the packing 7 is also released. When the male tube 3 is pulled in this state, the male tube 3 can be easily pulled out.

FIG. 9 shows a second embodiment of the pipe joint according to the present invention. In the first embodiment, in order to urge the sleeve 4 outward in the axial direction of the female tube 2, the distal end surface of the fixing screw 8 is brought into contact with the end surface of the female tube 2. The screw 10 is inserted into the flange portion 4d of the above, and an adjusting nut 11 is screwed into the screw 10, and the tip of the screw 10 is screwed and fixed to the screw hole 12 of the female pipe 2. In this case, by turning the adjusting nut 11 by hand without using a tool or the like, the distance L between the flange portion 4d and the end face of the female pipe 2 is enlarged, and the sleeve 4 is moved outward in the axial direction of the female pipe 2. Can be moved to

FIGS. 10 and 11 show a third embodiment of the pipe joint according to the present invention. In this embodiment, as in the second embodiment, a screw 20 is inserted through the flange 4 d of the sleeve 4, a U-shaped lock member 21 is inserted through the screw 20, and the distal end of the screw 20 is connected to the female tube 2. Screw holes 22. Spherical first and second protrusions 21a and 21b are provided at different positions on the front and back sides of the lock member 21, respectively. When the lock member 21 is rotated counterclockwise, the protrusion shown in FIG. As described above, the first protrusion 21a is press-fitted between the back surface of the flange portion 4d and the end surface of the female pipe 2, and the sleeve 4 is pulled outward. Therefore, the top 5 is pressed against the first tapered surface 2d, and the female pipe 2 and the male pipe 3 are locked.
In the locked state, in order to prevent the lock member 21 from coming off, for example, a first
The protrusion 21a may be provided with a recess for engagement.
Conversely, when the lock member 21 is turned clockwise, the second protrusion 21b comes into pressure contact with the surface of the flange portion 4d to urge the sleeve 4 inward as shown in FIG. it can. Therefore, the top 5 comes off the first tapered surface 2d, and the lock between the female pipe 2 and the male pipe 3 is released. The springs 23 and 24 are provided between the end of the female pipe 2 and the lock member 21 and between the head of the screw 20 and the lock member 21, respectively.
Is advantageous in that the position of the lock member 21 is stabilized during locking and unlocking.

In the above embodiment, the female pipe 2 constituting the pipe joint body is of a socket type open in two directions. However, it is also possible to form a screw at one end and screw it to the pipe. . Further, it is needless to say that the female pipe may be provided with a connection port in three directions or four directions. A stopper wall for defining the insertion depth of the male pipe 3 may be provided inside the female pipe 2. The pipe joint of the present invention can be used not only for connecting a metal pipe such as a steel pipe, but also for connecting a resin pipe. Further, the pipe joint body (female pipe) and the sleeve are not limited to being formed of a metal material, but may be formed of a resin material. The opening of the sleeve does not need to be a hole, and may be, for example, a cutout opening at one end in the axial direction. In the above embodiment, the wire 6 is engaged and held in the peripheral groove 4a formed on the outer peripheral surface of the sleeve 4. However, a peripheral groove is formed on the inner peripheral surface of the sleeve 4, and the wire 6 is engaged with the peripheral groove from the inner diameter side. They may be combined.

[0028]

As is apparent from the above description, according to the present invention, the inner peripheral surface of the female pipe, which is located deeper than the first tapered surface that is in pressure contact with the top, has 2 and a packing having a tapered outer peripheral surface that is in contact with the second tapered surface is attached to the distal end of the sleeve. As the sleeve moves outward in the axial direction, the packing becomes the second tapered surface. As a result, the packing is pressed in the inner diameter direction, and the packing can be in close contact with the outer peripheral surface of the male pipe. Therefore, the conventional O
Compared to a seal structure using a ring, it is possible to cope with variations in the outer diameter of the male pipe, and to reliably seal between the female pipe and the male pipe. Further, since the bead-shaped top is held and attached to the sleeve by the wire, the top does not fall off the sleeve, and the top can be largely protruded from the sleeve toward the inner diameter side. Therefore, there is an effect that a large allowance for engagement between the top and the male tube is obtained, and the locking force with respect to the male tube is increased.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a first embodiment of a pipe joint according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is an exploded perspective view of a sleeve, a top, a wire, and a packing.

FIG. 4 is a half sectional side view of a sleeve.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a front view of the top and a cross-sectional view taken along line BB.

FIG. 7 is an enlarged sectional view of an example of a packing.

FIG. 8 is an enlarged sectional view of another example of the packing.

FIG. 9 is a partial sectional view of a second embodiment of the pipe joint according to the present invention.

FIG. 10 is a partial sectional view of a pipe joint according to a third embodiment of the present invention.

FIG. 11 is a front view when the lock member is operated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Female pipe (pipe joint main body) 2d 1st taper surface 2e 2nd taper surface 3 Male tube 4 Sleeve 4c Locking claw 5 Top 6 Wire 7 Packing 7a Seal part 7b Engagement groove 7c Tapered outer peripheral surface

Claims (4)

[Claims] A female pipe serving as a pipe joint body, a sleeve inserted into the inner circumference of the female pipe, and a male pipe inserted into the inner circumference of the sleeve; A first tapered surface having a gradually increasing diameter on the part side is formed, and a plurality of bead-like pieces are held in the sleeve in a circumferential direction by a substantially ring-shaped wire inserted through the pieces, and the sleeve is moved with respect to the female pipe. In the pipe joint for urging the top piece between the first tapered surface and the outer peripheral face of the male pipe by urging the top piece in the axial direction to prevent the male pipe from coming off with respect to the female pipe, A second tapered surface having a gradually increasing diameter on the deep side is formed on the inner peripheral surface on the deeper side than the first tapered surface, and a taper that contacts the second tapered surface on the distal end of the sleeve. Packing having an outer peripheral surface and an inner peripheral surface in contact with the outer peripheral surface of the male pipe is mounted. Pipe joint characterized by and. 2. The pipe joint according to claim 1, wherein said packing is mounted on a distal end portion of said sleeve so as to be movable in an axial direction by a predetermined distance. 3. An engaging groove is formed on an inner peripheral surface of the packing, and a locking claw is formed on an outer peripheral surface of a distal end portion of the sleeve to engage the engaging groove of the packing to prevent the packing from coming off in the axial direction. The pipe joint according to claim 1, wherein the pipe joint is formed. 4. A stopper surface is formed on the inner peripheral surface of the female pipe at a position deeper than the second tapered surface to limit the movement of the packing toward the back, and the packing is fitted on the inner peripheral surface of the female pipe. By inserting the sleeve into the female tube while
4. The pipe joint according to claim 3, wherein the locking claw can automatically engage with an engagement groove of the packing.