JPH1089562A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint which has a sealing material disposed between a receiving port and an inserting port and can more surely prevent a pipe from slipping off from the receiving port and improve workability. SOLUTION: A packing 4 has a lip 4b made on the outer peripheral surface of a cylindrical part 4a and is fitted on the inserting port 3a and the assembly is inserted into a receiving port 2 and then a slip-off preventing ring 5 having a main body 6.6b facing the lip 4b in the axial direction in the receiving port 2 and a movable wall 7 elastically deformed in the radial direction is inserted into the receiving port 2. The movable wall 7 is elastically restored in the receiving port 2 from the elastically deformed state when it is inserted and is axially engaged with the engaging collar 2b of the receiving port 2. Therefore, only the simple inserting work of the slip-off preventing ring 5 can produce a connecting state in which a pipe is further surely prevented from slipping off and improve workability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint used for connecting pipes such as a drain pipe.

[0002]

2. Description of the Related Art When connecting drain pipes in a high-rise building or the like, pipes are connected at appropriate locations. Examples of pipe joints used for connecting such pipes are disclosed in, for example, JP-A-1-269787.
No., published in Japanese Unexamined Patent Publication No. As shown in FIG. 8, the pipe joint has a rubber packing (seal) having a tongue-like inwardly protruding lip portion (seal portion) 42 on the inner surface of a substantially cylindrical tubular portion 41. (Member) 43 is used. In addition,
On the outer peripheral surface of the cylindrical portion 41, a ridge portion 44 projecting in a triangular cross section
Is further provided.

As shown in FIG. 9, the packing 43 is previously fitted along an inner surface of a receiving port 45 provided at a pipe end of one pipe. In this fitted state, the projecting portion 44 is
The groove 43 is fitted in the concave groove formed on the inner surface and engages in the axial direction, thereby preventing the packing 43 from coming off from the receiving port 45. By inserting a tube end side of the other tube (hereinafter, referred to as a connection tube) 46 into the packing 43, that is, a so-called spout 46 a, the connection tube 46 is connected to the receiving port 45. With the insertion of the spigot 46a at this time, the lip portion 42 is elastically deformed and closely adheres to the outer peripheral surface of the spigot 46a, thereby imparting water stopping (sealability) between the packing 43 and the spigot 46a. You.

As described above, in the above, the packing 43 is elastically deformed by the insertion of the spigot 46a, and the elastic recovery force of the packing 43 is used.
The sealing property between the spout 46a and the spout 46a is provided, but this elastic recovery force also serves as insertion resistance when the spout 46a is inserted.
In this case, since the contact with the spigot 46a is made only by the lip portion 42 which partially protrudes from the inner surface of the cylindrical portion 41, the contact area is relatively small.
The sliding resistance when the 43 and the connection pipe 46 relatively move in the axial direction can be suppressed relatively small. As a result, the spigot 46a can be inserted into the packing 43 without requiring excessive force, and the construction can be performed easily.

Conventionally, a flange joint structure is mainly used for connecting drainage pipes and the like. However, in comparison with this structure, it is not necessary to provide a flange or the like, and a fastening operation using a bolt and a nut is unnecessary. As a result, the whole becomes more compact, and the workability can be greatly improved.

[0006]

However, in the pipe joint described in the above publication, the ridge portion 44 of the packing 43 is not provided.
Is axially engaged with the receiving port 45, and the packing from the receiving port 45 is
The structure to prevent the 43 from coming off is adopted, but the packing is
Only the sliding resistance based on the elastic recovery force of the lip portion 42 functions when the connection tube 46 is pulled out of the connection tube 43. As described above, since the sliding resistance is set in consideration of the insertion force at the time of the insertion work of the port 46a, for example, if the water pressure flowing inside becomes high, the internal pressure becomes large.
Since the connection pipe 46 acts as a force in the removal direction from the receiving port 45, the connection pipe 46 may be removed. For this reason, there is a problem that the use range is limited.

[0007] In order to ensure that such a pipe is prevented from coming off even with a greater force in the direction of coming off, for example, an engaging groove is provided on the outer peripheral surface of the spigot 46a. It is conceivable that the member fitted into the mating groove is further locked to the receptacle 45 so that the spigot 46a and the receptacle 45 are engaged in the axial direction. However, in order to adjust the length in the field, the connecting pipe 46 is generally used by appropriately cutting the front end side of the spout 46a, and therefore, as described above, it is assumed that the spout 46a is processed. Such an engaging structure requires additional work on site and greatly reduces workability.

The present invention has been made in view of the above-mentioned conventional problems, and in a pipe joint having a sealing member interposed between a receiving port and a spigot, it is possible to prevent the pipe from coming off from the receiving port. An object of the present invention is to provide a pipe joint that can be reliably prevented and that can be easily installed.

[0009]

In order to achieve the above-mentioned object, a pipe joint according to a first aspect of the present invention comprises an inner peripheral surface of a receiving port of a first pipe and a second pipe inserted into the receiving port. A seal member made of an elastic body is interposed between the outer peripheral surface of the spigot and a locking flange protruding radially inward on the open end side of the receiving port. Is formed in a shape having a substantially cylindrical tubular portion mounted on the outer peripheral surface of the spout, and a seal portion projecting outward from the outer peripheral surface of the cylindrical portion, and the seal member is mounted. Insert the spout into the socket,
A retaining member is provided which is inserted into the receiving port through the inner space of the locking flange in a state where the seal portion is pressed against the inner peripheral surface of the receiving port on the axially inner side of the locking flange. The member includes a main body located in the receiving port on the receiving port opening end side of the seal section, and a movable section connected to the main body so as to be elastically deformable in the radial direction. It is characterized in that a catch engaging portion facing the locking flange from the back side in the axial direction is provided by a radially outward elastic return operation after passing through the inside of the locking flange in an elastically deformed state.

In the pipe joint having the above-described structure, the sealing member is provided with a desired amount of elastic deformation in the radially expanding direction to the cylindrical portion of the sealing member, and is attached to the spigot or bonded to the outer peripheral surface of the spigot. The member may be in a mounted state in which relative movement with respect to the spigot in the axial direction is prevented. Therefore, in order to prevent the second pipe from coming off from the receiving port, it is sufficient to adopt a configuration in which the removal of the sealing member from the receiving port is prevented. After the insertion into the receptacle, a retaining member is provided which is inserted into the receptacle from the receptacle opening end side.

When the stopper is inserted into the receiving port, the movable portion elastically returns from the elastically deformed state in the receiving port, and the receiving portion engaging portion faces the locking flange of the receiving port from the back side in the axial direction. In other words, a state in which the movement to the receiving port opening end side is prevented by the locking flange. In this state, since the main body portion of the retaining member is located closer to the opening end of the receiving port than the seal portion, when the second pipe is displaced in the direction of removal from the receiving port, the second pipe is displaced integrally therewith. The seal part of the seal member is
The main body is abutted and locked, and as a result, the second tube is prevented from coming off.

[0012] In this case, it is not necessary to separately perform processing for preventing the pipe from coming off in the spout, so that additional work on site is unnecessary, so that good workability can be maintained. In addition, the above-mentioned retaining member can be automatically inserted into the receptacle so that the removal from the receptacle is automatically prevented.Therefore, for example, the retaining member is fixed in the receptacle. Since there is no need to use a complicated structure such as a screwing structure, the work is further facilitated and the workability is improved.

According to a second aspect of the present invention, the movable portion is connected to the main body at a position axially deeper than the socket engaging portion, and is formed so as to be elastically deformable in the radial direction with the connecting portion as a fulcrum. It is characterized by having. According to this configuration, even if the force of the second tube from the receiving port in the direction in which the second tube comes off is greater, the second tube is more reliably prevented from coming off. In other words, the force in the pull-out direction causes a force that presses the receiving port engaging portion that is in contact with the locking flange to the axially deep side, but this force is applied to the receiving port engaging portion. , And acts to slide radially outward while maintaining contact with the locking flange.

That is, in the above configuration, the socket engaging portion is located at a position which is inclined from the fulcrum position on the inner side in the axial direction to the open end side of the socket and radially outward. The force pressing the inner side in the axial direction acts so as to further increase the inclined position of the socket engaging portion from the fulcrum position, that is, to cause the socket engaging portion to be displaced radially outward. I do. As a result, even when a greater force in the pull-out direction is applied, the movable portion does not deform such that the socket engaging portion is directed radially inward along the locking flange. The axially engaged state between the portion and the locking flange is reliably held, and the tube is prevented from coming off.

According to a third aspect of the present invention, the disengagement operation portion for elastically deforming the movable portion in the socket radially inwardly projects outward from the opening end of the socket through the inner space of the locking flange. It is characterized in that it is extended to the movable part in a shape that does.
According to this configuration, the entire movable portion is deformed radially inward around the fulcrum position by pushing the disengagement operation portion protruding outward from the receptacle opening end inward in the radial direction. Then, the socket engaging portion moves to the space inside the locking flange. In this state, the retaining member can be pulled out from the receiving port. Thereafter, by applying a pulling force against the elastic recovery force of the seal portion of the seal member to the second tube, this tube can be pulled out from the receiving port together with the seal member.
Therefore, in the above, the connection state of the first and second pipes can be easily released, and therefore, workability at the time of replacement of the pipes and the like can be improved.

According to a fourth aspect of the present invention, there is provided the pipe joint, wherein a movable portion receiving surface which generates a contact sound when the movable portion abuts upon the elastic return operation in the receptacle is provided on the inner surface of the receptacle. And According to this configuration, when the retaining member is inserted into the receiving port, the receiving port engaging portion elastically returns after passing through the inside of the locking flange and is located at the axial engagement position with the locking flange. , Confirmed by sound. Therefore, after inserting the retaining member, it is not necessary to separately perform an operation of confirming whether or not a connection state in which detachment is surely prevented is obtained, thereby further improving workability.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first tube (hereinafter, referred to as a first tube).
In the socket 2 provided at the pipe end of the
A pipe end portion (hereinafter, referred to as a connection pipe) of a second pipe (hereinafter, referred to as a connection pipe) 3
Insert this tube end into the outlet 3a.
3 are coaxially connected to each other. In the case of drain pipes, these pipes 1 and 3 are, for example, JIS standard FCD50
It is formed of a cast iron tube consisting of zero. A packing (seal member) 4 made of an elastic body for providing water stoppage and a retaining ring (for preventing the connection pipe 3 from coming off from the receiving port 2) are provided between the receiving port 2 and the outlet 3a. A retaining member 5 is interposed.

As shown in FIG. 2, the receiving port 2 has a cylindrical wall 2a whose inner and outer diameters are slightly larger than those of the connecting pipe 3. The opening end side of this cylindrical wall 2a is formed in a substantially F-shaped cross section, and at the position of the opening end, a locking flange 2b is provided which projects perpendicularly to the pipe axis and projects inward from radially outward. I have.
The diameter of the inner peripheral surface of the locking flange 2b is substantially the same as the inner diameter of the cylindrical wall 2a, and the inner peripheral surface of the cylindrical wall 2a is located on the inner side (lower side in the figure) of the locking flange 2b in the axial direction. An engagement groove 2c having a substantially F-shaped cross section that is recessed radially outward from the surface is formed in an annular shape. On the other hand, the lower end of the cylindrical wall 2a is joined to the lower tube portion 2e via a step wall 2d that extends radially inward perpendicular to the tube axis.

The packing 4 is made of an elastomer such as ethylene propylene rubber, styrene butadiene rubber, chloroprene rubber or the like, and has a cylindrical portion 4a having a predetermined axial length as shown in FIG. A lip portion (seal portion) 4b having a shape that is inclined obliquely upward and protrudes outward is provided in an annular shape on the outer periphery on the lower end side in the drawing of the portion 4a. The cylindrical portion 4a is formed to have a smaller diameter than the outer diameter of the connection pipe 3, and the inner peripheral surface of the lower end portion of the cylindrical portion 4a has a diameter corresponding to the thickness of the connection pipe 3 in the radial direction. A tube receiving portion 4c protruding in the direction is formed in a step shape.

The retaining ring 5 is made of, for example, a synthetic resin material such as polypropylene or polyethylene, or a metal material having elasticity such as spring steel. As shown in FIG. It is configured.
The main body 6 is formed by circumferentially connecting four arc-shaped walls 6a... Sequentially positioned on the same circumference and flat plate walls 6b... Positioned between these arc-shaped walls 6a. . A flange 6c extending radially outward is continuously provided on the upper end surface of each arc-shaped wall 6a. On the other hand, each of the flat walls 6b has a height dimension from the lower end set to about half of the arc-shaped wall 6a, and a predetermined gap from the main body 6 in the circumferential direction is provided on each of the upper portions of the flat walls 6b. Movable walls (movable parts) 7.

Each of the movable walls 7 has a flat plate-like shape along the circumferential direction, similarly to the flat wall 6b, except that the outer surface of a claw 7d described later is arc-shaped. Therefore, when an external force in the radial direction acts on these movable walls 7, these movable walls 7 can be bent and deformed in the radial direction with the portion connected to the flat plate wall 6b as a fulcrum. As shown in FIG. 5, the inner surface of each flat wall 6b has an arc-shaped wall 6a.
Are connected to the circumferentially adjacent arc-shaped walls 6a via connecting portions 6d so as to be located slightly radially outward from the inner peripheral surface of the inner peripheral surface.

Each movable wall 7 is a flat wall as shown in FIG.
6b, a base inclined wall 7a inclined obliquely upward from the upper end position toward the radial direction outward, a vertical wall 7b extending upward from the upper end of the base inclined wall 7a, and further obliquely upward from the upper end of the vertical wall 7b. An upper end inclined wall (engagement release operation portion) 7c that is inclined and protrudes above the upper surface of the flange portion 6c is formed in a sequentially connected shape.

On the radially outward surface of the continuous portion between the base inclined wall 7a and the vertical wall 7b, a claw (a receiving portion engaging portion) projecting outward in a stepped manner with respect to the vertical wall 7b is formed. ) 7d is formed. Next, an operation procedure for connecting pipes using the pipe joint having the above configuration will be described with reference to FIG.

In the connecting operation, first, as shown in FIG. 3A, a retaining ring 5 is fitted over the spigot 3a of the connecting pipe 3 and held at a position appropriately separated from the pipe end. Next, the packing 4 is attached to the spigot 3a. This packing 4
As described above, the inner diameter of the cylindrical portion 4a is smaller than the outer diameter of the spigot 3a. Therefore, the cylindrical portion 4a is inserted into the spigot 3a while expanding the diameter. This insertion is performed until the tube receiving portion 4c comes into close contact with the end face of the spigot 3a as shown in FIG.

In this mounted state, the elastic characteristic of the packing 4 and its shape and dimensions are set so that the cylindrical portion 4a is brought into close contact with the spigot 3a with a sufficiently large surface pressure. by this,
Water stoppage between the packing 4 and the outlet 3a is provided.
Further, the cylindrical portion 4a having a relatively long axial dimension.
When the packing 4 and the connecting pipe 3 move relative to each other in the axial direction, a large sliding resistance is generated between the packing 3 and the connecting pipe 3 because the mounting state is such that a large surface pressure is generated between the packing 3 and the port 3a. As a result, even if an external force having a magnitude normally supposed to be applied to the connection pipe 3 in the release direction in the pipe connection state described later, the detachment of the connection pipe 3 from the packing 4 can be sufficiently performed by the above-described sliding resistance. It has been blocked.

When it is assumed that the pressure in the pipe is higher and a large force acts on the connecting pipe 3 in the pull-out direction, the cylindrical portion 4a of the packing 4 is attached to the spout 3a by an adhesive. The attachment state may be used by bonding using. In this case, in addition to the elastic recovery force of the cylindrical portion 4a, the adhesive force of the adhesive acts as a force against the release direction, whereby the packing 4 can be more firmly attached to the spout 3a. it can.

After the attachment of the packing 4 to the spout 3a is completed as described above, a lubricant such as soapy water is applied to the inner surface of the spout 2 and the surface of the lip 4b, and the spout 3a is inserted into the spout 2. insert. The packing 4 is expanded in diameter and attached to the spigot 3a.
The outer diameter of 4a is smaller than the inner diameter of the cylindrical wall 2a in the receiving port 2, and the lip portion 4b projects radially outward from the inner peripheral surface of the cylindrical wall 2a. Therefore, when inserting the spigot 3a into the receptacle 2, the outer distal end side of the lip portion 4b is bent radially inward in accordance with the inner diameter of the cylindrical wall 2a in the receptacle 2. As shown in FIG.
As shown in (c), the spigot 3a is inserted into the spout 2 until the pipe receiving portion 4c of the packing 4 is in close contact with the step wall 2d of the spout 2. In this inserted state, the above-mentioned elastic recovery force of the lip portion 4b imparts water stopping between the inner surface of the receiving port 2 and the packing 4.

After the spigot 3a is inserted into the receptacle 2, the retaining ring 5 held above the port 3a is moved along the connecting pipe 3 and inserted into the receptacle 2. With the operation of inserting the retaining ring 5, first, the main body 6
Enters the space between the cylindrical portion 4a of the packing 4 and the inner surface of the receptacle 2. During this insertion operation, the movable wall 7
In the process in which the base inclined wall 7a contacts the inner peripheral edge of the locking flange 2b at the upper end of the receiving port 2 and the insertion is further continued from this point,
While the movable wall 7 bends radially inward, the base inclined wall 7a and the claw 7d above the base inclined wall 7a sequentially pass between the locking flange 2b and the cylindrical portion 4a of the packing 4. .

Then, as shown in FIG. 1, the stopper ring 5 is pushed until the flange 6c at the upper end of the main body 6 comes into contact with the upper end surface of the receptacle 2, thereby completing the pipe connection operation. Immediately before this work is completed, the claw portion 7d is positioned below the locking flange 2b, and at this time, the pressing force of the locking flange 2b against the movable wall 7 inward in the radial direction is released. As a result, the movable wall 7 elastically returns instantaneously to the state shown in FIG.

When the movable wall 7 is elastically restored in this manner, the claw 7d is fitted into the engagement groove 2c of the receiving port 2, so that the retaining ring 5 is connected to the claw 7d and the locking flange.
Withdrawal from the inside of the socket 2 is prevented by the axial engagement with 2b. On the other hand, the main body 6 of the retaining ring 5
The lower end is located above and close to the lip 4b of the packing 4. Therefore, when the connecting pipe 3 moves in the direction of withdrawal from the receiving port 2, the packing 4 fixed to the spigot 3 a also moves integrally, and the lip portion 4 b moves downward to the main body 6 of the retaining ring 5. Contact from the side. As a result, further connection is prevented, and the connection pipe 3 is prevented from coming off.

When the movable wall 7 is elastically restored at the time of insertion into the receptacle 2 and the claw portion 7d is fitted into the engagement groove 2c, the outer surface of the vertical wall 7b instantaneously contacts the locking flange 2b from inside. The position of the vertical wall 7b is set to the locking flange 2b so that a clicking sound is generated upon contact.
It is set according to the inner surface dimensions. Therefore, in this case, the inner peripheral surface of the locking flange 2b is formed as a movable portion receiving surface that generates a contact sound when the movable wall 7 elastically returns. The generation of the contact sound as described above allows the operator to confirm by sound that the connection state has been established in which insertion of the retaining ring 5 reliably prevents the pipe from coming off.

As described above, the packing 4 in the present embodiment has the lip portion 4b provided on the outer peripheral surface of the cylindrical portion 4a, and the packing 4 is previously mounted on the spigot 3a of the connection pipe 3. Then, it is inserted into the socket 2. Due to the elastic recovery force based on the elastic deformation of the lip portion 4b accompanying this insertion, the waterproofness between the packing 4 and the inner surface of the receiving port 2 is given. The elastic recovery force of the lip portion 4b also serves as insertion resistance during the insertion operation, but since the contact area of the lip portion 4b with the receptacle 2 is relatively small, the insertion operation can be performed with a smaller force.

On the other hand, the water stoppage between the inner surface of the packing 4 and the spout 3a is given by the elastic recovery force of the tubular part 4a when the tubular part 4a is expanded and mounted on the spout 3a. The cylindrical portion 4a has a larger contact area with the outer surface of the spigot 3a than the lip portion 4b which needs to set a contact area in consideration of resistance during insertion work. Even if the surface is rough, such as a cast iron pipe, it is possible to provide a stable water stopping property with the spout 3a by the elastic recovery force of the cylindrical portion 4a.

In this embodiment, the pipe 4 is prevented from coming off by inserting the packing 4 into the spigot 3a, inserting it into the receptacle 2 and then inserting the retaining ring 5 into the receptacle 2. A connected state is obtained. In this case, it is not necessary to separately perform processing for preventing the pipe from coming off in the spout 3a, and therefore, additional work on site is unnecessary, so that good workability can be maintained. In addition, since the retaining ring 5 has the movable wall 7 which is elastically restored from the elastically deformed state upon insertion into the receiving port 2 and is in an axially engaged state with the locking flange 2b of the receiving port 2. The state where the removal from the inside of the receiving port 2 is automatically prevented is obtained only by the operation of inserting the receiving ring into the receiving port 2. Therefore, in order to fix the retaining ring in the receiving port, for example, a screwing structure or the like is used. There is no need to have a complicated structure. This further facilitates the work and improves workability.

Further, since the engaging groove 2c of the receiving port 2 is formed over the entire circumference, when the retaining ring 5 is inserted, any angular position in the circumferential direction with respect to the receiving port 2 may be used. Therefore, since there is no directivity, the work of inserting the retaining ring 5 can be performed very easily. On the other hand, the retaining ring 5 has a position where the movable wall 7 is connected to the main body 6 in the axially deeper side than the claw portion 7d, and the connection portion is used as a fulcrum to radially move the claw portion 7d side. It is configured to be capable of elastic deformation. This allows
Even in the case where the force of the connection pipe 3 from the receiving port 2 in the removal direction is larger, the removal is more reliably prevented.

That is, the force in the pulling-out direction generates a force for pressing the claw 7d, which is in contact with the locking flange 2b of the receiving port 2, toward the inner side in the axial direction. At this time, the claw 7d is located at a position that is inclined from the fulcrum position on the back side in the axial direction to the receiving port opening end side and radially outward, so that the claw 7d is pressed toward the back side in the axial direction. The force to be applied is to further increase the inclined position of the claw 7d from the fulcrum position, that is, the claw 7d
Act to slide radially outward along the locking flange 2b.

As a result, even when a greater force in the pull-out direction acts, the movable wall 7 is not deformed such that the claw portion 7d moves radially inward along the locking flange 2b. The axial engagement state between the portion 7d and the locking flange 2b is reliably maintained, and the tube is prevented from coming off. Further, in the above configuration, the connection state can be easily released when the connection pipe 3 is replaced or the like. That is, the movable wall 7 of the retaining ring 5 has an upper end inclined wall 7c that protrudes upward from the flange 6c.
Are provided integrally. Therefore, when this is pressed inward in the radial direction, the claw portion 7d is located inside the inner surface of the locking flange 2b. In this state, the retaining ring 5 can be pulled out from the receiving port 2. Thereafter, by applying a pull-out force against the elastic recovery force of the lip portion 4b of the packing 4, the connection pipe 3 can be pulled out from the receiving port 2 together with the packing 4. The new connecting pipe 3 has the packing 4 attached to the spout 3a in the same manner as described above, and is connected to the receiving port 2 in the same operation procedure as described above.

In this embodiment, the main body 6 of the retaining ring 5 also functions as a steadying portion of the spigot 3a. That is, the main body 6 is inserted into the space between the inner peripheral surface of the receiving port 2 and the cylindrical portion 4a of the packing 4,
This space is configured to be as small as possible over the entire circumference. Thereby, the run-out of the spigot 3a is suppressed, and concentricity between the lip portion 4b and the receiving port 2 is maintained, so that the pressed state of the lip portion 4b against the inner peripheral surface of the receiving port 2 is more uniform over the entire circumference. Is secured. As a result,
Further, good water stopping properties can be maintained.

The above embodiment does not limit the present invention, and various changes can be made within the scope of the present invention. For example, in the above-described embodiment, an example in which the retaining member 5 is formed in a ring shape has been described, but a structure in which a cut is provided at one location in the circumferential direction so that the inner diameter can be changed according to a variation in the pipe diameter or the like. Or other structures such as a structure further divided into a plurality in the circumferential direction.
Further, in the above embodiment, an example in which the pipe joint of the present invention is applied to a drain pipe has been described, but the present invention can be applied to connection of any other pipe.

[0040]

As described above, in the pipe joint according to the first aspect of the present invention, a seal member formed by providing a seal portion on the outer peripheral surface of a substantially cylindrical tubular portion is attached to the spigot, After this is inserted into the receiving port, the main body is provided in the receiving port so as to face the seal portion in the axial direction, and a retaining member axially engaging with the receiving port is further inserted into the receiving port, thereby forming the pipe. A connected state in which the detachment is prevented is obtained.

In this case, it is not necessary to separately perform processing for preventing the pipe from coming off at the spout, and therefore, no additional work on site is required, so that good workability can be maintained. Moreover, since the above-mentioned retaining member has a movable portion which is elastically restored from the elastically deformed state and is axially engaged with the locking flange of the receiving port upon insertion into the receiving port, it is inserted into the receiving port. By simply performing the work, it is possible to obtain a state in which the removal from the inside of the receptacle is automatically prevented, so that it is not necessary to use a complicated structure such as a screwing structure for fixing the retaining member in the receptacle. . This further facilitates the work and improves workability.

[0042] In the pipe joint according to the second aspect, the movable portion is connected to the main body portion at a position axially deeper than the socket engaging portion, and is formed so as to be elastically deformable in the radial direction with the connection portion as a fulcrum. Therefore, the force for pressing the socket engaging portion from the locking flange to the back side in the axial direction is such that the inclination angle from the fulcrum position to the socket engaging portion is further increased, that is, It acts to cause a radial outward displacement. As a result, even when a larger force in the pull-out direction acts on the second tube, the movable portion does not deform such that the socket engaging portion goes radially inward along the locking flange. In addition, the axial engagement state between the socket engaging portion and the locking flange is reliably maintained, and the pipe is prevented from coming off.

In the pipe joint according to the third aspect, since the engagement release operating portion having a shape protruding outward from the opening end of the receiving port through the space inside the locking flange in the receiving port is extended to the movable portion, By pushing the disengagement operation part inward in the radial direction, the axial engagement positional relationship between the receiving part engaging part and the locking flange can be released and the retaining member can be pulled out from the receiving part. Then, the second tube together with the sealing member can be withdrawn from the receptacle. That is, the connection state of the first and second pipes can be easily released, and therefore, the workability at the time of replacement of the pipes and the like can be improved.

In the pipe joint according to the fourth aspect, a contact sound is generated when the movable portion resiliently returns in the receiving port, so that the connection state in which the retaining member is prevented from being detached after the stopper member is inserted can be reliably obtained. It is not necessary to separately perform a work of checking whether or not the work has been performed, thereby further improving workability.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a connected state of pipes using a pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a shape of a pipe on a receiving port side of the pipe joint.

FIG. 3 is a partially cutaway front view showing a shape of a packing in the pipe joint.

FIG. 4 is a perspective view showing a shape of a retaining ring in the pipe joint.

FIG. 5 is a plan view of the retaining ring.

FIG. 6 is a sectional view taken along line X-O′-O-Y in FIG. 5;

FIG. 7 is an explanatory view showing an operation procedure of pipe connection using the pipe joint.

FIG. 8 is a cross-sectional view showing a shape of a packing used for a conventional pipe joint.

FIG. 9 is a cross-sectional view showing a connected state of pipes by a pipe joint in which the packing shown in FIG. 8 is interposed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint pipe (1st pipe) 2 Reception port 2b Locking flange 3 Connection pipe (2nd pipe) 3a Spout 4 Packing (seal member) 4a Tubular part 4b Lip part (seal part) 5 Retaining ring ( 6 Main part 7 Movable wall (movable part) 7c Upper inclined wall (disengagement operation part) 7d Claw part (receptacle engaging part)

Claims (4)

[Claims] 1. A pipe joint in which a seal member made of an elastic body is interposed between an inner peripheral surface of a receiving port of a first pipe and an outer peripheral face of a port of a second pipe inserted into the receiving port. A locking flange is provided on the opening end side of the receiving port so as to protrude inward in the radial direction, while the seal member is provided with a substantially cylindrical tubular portion mounted on the outer peripheral surface of the spout, and A seal having a seal portion protruding outward from the outer peripheral surface is formed, and the spigot provided with the seal member is inserted into a socket, and the seal portion is located on the back side in the axial direction with respect to the locking flange. A retaining member is provided which is inserted into the receiving port through the inner space of the locking flange in a state of being pressed against the inner peripheral surface of the receiving port. And a movable part connected to the main body so as to be elastically deformable in a radial direction.
It is characterized in that a receiving port engaging portion facing from the locking flange and the back side in the axial direction is provided by a radially outward elastic return operation after passing through the inside of the locking flange in an elastically deformed state. Pipe fittings. 2. The method according to claim 1, wherein the movable portion is connected to the main body at a position axially deeper than the socket engaging portion, and is formed so as to be elastically deformable in a radial direction with the connection portion as a fulcrum. The pipe joint according to claim 1. 3. An engagement release operation portion for elastically deforming the movable portion in the receiving port radially inwardly has a shape projecting outward from the receiving opening opening end through the inner space of the locking flange. The pipe joint according to claim 2, wherein the pipe joint is extended. 4. A movable portion receiving surface which generates a contact sound when the movable portion abuts upon an elastic return operation in the receptacle is provided on the inner surface of the receptacle. 4. The pipe joint according to 2 or 3.