JPH088384Y2 - Detachment prevention fitting - Google Patents

Description

[Detailed description of the device]

[0001]

[Field of Industrial Application] The present invention relates to a separation prevention pipe joint,
In particular, the present invention relates to a slip-on type separation prevention pipe joint in which an annular sealing material is compressed between the receiving ports when the receiving port is inserted into the receiving ports.

[0002]

2. Description of the Related Art Conventionally, a slip-on type separation prevention pipe joint in which an annular groove is formed in each of the inner periphery of the receiving port and the outer periphery of the insertion port, and an annular lock ring is fitted in both annular grooves. It has been known. The lock ring is configured so that it can be tightened in one part in the circumferential direction, and when it is fitted in both annular grooves, it is tightened in the annular groove on the insertion side.

When joining such a pipe joint, first, the diameter of the lock ring is reduced by an appropriate tool and inserted into the receiving port, and the reducing force is released at the position of the annular groove to fit into the annular groove. Next, when the insertion opening is inserted into the reception opening, the tapered surface of the outer circumference of the tip of the insertion opening pushes the lock ring open, so that the insertion opening passes through the lock ring. Then, when the annular groove of the insertion slot reaches the position of the lock ring, the lock ring fits into the annular groove and is tightened in this annular groove, and fits into both annular grooves of the receiving slot.

[0004]

However, in the above-mentioned conventional structure, the lock ring to be elastically deformed has a considerable rigidity, and a large force is required for the diameter reduction by the tool and the expansion by the tip of the insertion opening. However, there is a problem that it takes time to join the pipes.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve such problems and to make the lock ring easily elastically deformable so that the pipe joining work can be performed efficiently.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is a slip-on type detachment in which an annular sealing material is compressed between receiving openings when the insertion opening is inserted into the receiving openings. In the prevention pipe joint, a ring-shaped protrusion is formed at the tip of the insertion port inserted into the receiving port, and the inside of the receiving port at the receiving port opening end side from the protrusion of the insertion port when inserted into this receiving port An annular groove is formed on the circumference, and in this annular groove, a lock ring is formed that is divided in the circumferential direction, and a thin portion is formed at an appropriate position in the circumferential direction.
When the insertion opening is inserted into the receiving opening while being fitted in the annular groove, it is configured to be spread by the annular protrusion so as to allow the passage of the protrusion, and the protrusion passes. After that, the expanded state is released and the outer periphery of the insertion slot is tightened.

[0007]

With this structure, since the lock ring is easily elastically deformed due to the presence of the thin portion, it is possible to reduce the diameter of the lock ring with a tool when fitting it into the annular groove or when inserting the insertion hole. The spread by the insertion opening can be easily performed. In addition, this lock ring can be installed at a predetermined position between the receiving opening by simply inserting the inserting opening into the receiving opening with the lock ring fitted in the annular groove of the receiving opening. Can be easily installed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a socket for a cast iron pipe, and 2 is an insertion opening, into which an insertion opening 2 can be inserted. An annular groove 3 is formed in the inner periphery of the receiving opening 1 in the vicinity of the opening end, and an annular rubber seal member 4 that is compressed between the receiving opening is attached to the annular groove 3. There is.

Another ring-shaped groove 5 is formed on the inner circumference of the receiving port 1 on the inner side of the ring-shaped groove 3, and a lock ring 6 is fitted in the ring-shaped groove 5. A step portion 7 in the pipe radial direction is formed at the rear end of the receiving port 1 at a certain distance from the annular groove 5. An annular projection 8 is formed at the tip of the insertion slot 2, and the outer periphery of the opening of the insertion slot 2 further on the tip side than the annular projection 8 has a tapered recess continuous with the annular projection 8. A tapered surface 9 is formed. Further, a taper surface 10 capable of engaging with the taper surface 9 of the insertion opening 2 is formed on the inner periphery of the lock ring 6 on the opening side of the receiving opening.

As shown in FIG. 3, the lock ring 6 is made of cast iron and is divided into one in the circumferential direction and has a dividing portion 11. Further, the lock ring 6 is formed with a thin portion 12 in a certain range at every 90 degrees in the circumferential direction. As shown in FIGS. 3 and 4, groove portions 14 for engaging with the scissors-like diameter reducing tool 13 are formed at both end portions of the lock ring 6 in the vicinity of the dividing portion 11, respectively.

With such a construction, when joining the pipes, the diameter of the lock ring 6 is first reduced by the diameter reducing tool 13 and inserted into the receiving port 1 and then fitted into the annular groove 5. At this time, since the lock ring 6 has the thin-walled portion 12, the thin-walled portion 12 is easily elastically deformed. Therefore, when the diameter is reduced by the diameter-reducing tool 13, too much force is required, and the inside of the receiving port 1 It is possible to easily perform the insertion work into and the fitting work into the annular groove 5.

Next, the insertion slot 2 is inserted into the receiving slot 1. Then, guided by the tapered surface 9, the sealing material 4 is first compressed between the receiving opening. After that, the insertion slot 2 reaches the position of the lock ring 6, and the taper surface 9 thereof becomes the taper surface 10 of the lock ring 6.
Engage with and push open this lock ring 6. Also at this time, since the lock ring 6 has the thin portion 12, its elastic deformation is easy, and the annular projection 8 of the insertion slot 2 easily passes the position of the lock ring 6. Then, after that, the lock ring 6 is tightened in the insertion opening 2, and the joining of the pipes is completed.

As shown in FIG. 3, the thin portion of the lock ring 6
Since 12 is formed over a relatively wide width, stress concentration does not occur during elastic deformation. In FIG. 3, the inner peripheral side of the lock ring 6 is cut out to form the thin wall portion 12 on the outer peripheral side, but the outer peripheral side may be cut out to form the thin wall portion on the inner peripheral side. Further, both the inner and outer circumferences may be cut out to form a thin portion in the central portion of the lock ring 6. Further, the number of thin portions 12 in the circumferential direction is arbitrary.

Since a certain distance is provided between the lock ring 6 and the step portion 7 as shown in FIG. 1, as long as the annular projection 8 reciprocates within that range, the joint portion expands and contracts. Is possible. Further, since the lock ring 6 and the annular projection 8 can be engaged with each other, the joint portion can be provided with a seismic resistant separation prevention function.

FIG. 2 shows another example of the annular projection 8 of the insertion slot 2. In FIG. 1, the annular protrusion 8 is formed integrally with the insertion port 2, but in the case of FIG. 2, the ring 16 is fitted into the annular groove 15 formed in the insertion port 2 and the ring 16 is welded.
Is fixed to the insertion slot 2. In this case, the tapered surface 9 is constituted by both the tip portion of the insertion opening 2 and the welded portion 17.

[0016]

As described above, according to the present invention, since the lock ring can be easily elastically deformed due to the provision of the thin portion, it is possible to reduce the diameter of the lock ring by a tool into the receiving annular groove of the lock ring. It is possible to easily fit the lock ring and spread the lock ring by the insertion opening when inserting the insertion opening. Further, the lock ring is configured so that when the insertion opening is inserted into the receiving port in a state where the lock ring is fitted in the annular groove, the lock ring is expanded by the annular protrusion to allow passage of the protrusion. In addition, after the protrusion has passed, the expanded state is released and it is tightened on the outer periphery of the insertion slot, so the receiving ring with the lock ring fitted in the annular groove of the receiving slot The lock ring can be easily attached at a predetermined position between the receiving opening and the inserting opening by simply inserting the inserting opening into the receiving opening. Therefore, the pipes can be joined to each other in a short time with a simple operation.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a main part showing another example of the annular protrusion of the insertion slot in FIG.

FIG. 3 is an overall view of a lock ring according to the present invention.

FIG. 4 is a diagram illustrating a work of reducing the diameter of the lock ring.

[Explanation of symbols]

 1 Receptacle 2 Inlet 5 Annular groove 6 Lock ring 8 Annular protrusion 12 Thin part

Claims (1)

[Scope of utility model registration request] 1. A slip-on type separation prevention pipe joint in which an annular sealing material is compressed between the receiving openings when the insertion opening is inserted into the receiving opening, An annular projection is formed at the tip, and an annular groove is formed on the inner circumference of the receiving opening at the receiving opening end side of the insertion opening when inserted into this receiving opening. Fitted with a lock ring that is formed in one direction and has a thin portion formed at an appropriate position in the circumferential direction.
Insert the insertion slot into the socket while it is fitted in the annular groove.
When it is pressed, it is pushed out by the annular protrusion.
Is configured to allow the passage of the protrusion of
The extended state is released after the protrusion of the
A disconnection prevention pipe joint, which is configured to be tightened around the outer periphery of the insertion opening .