JPS5831028Y2 - Disengagement prevention pipe fitting - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint that prevents separation using a lock ring.

As a conventional separation prevention pipe joint, for example, Utility Model Publication 27-613
There is something like the one described in Publication No. 9.

This pipe joint has a lock ring that is fitted between the socket and the socket, and a lock ring that is brought into contact with this to form a wedge insertion gap, and the lock ring is inserted into the gap. Apply a wedge formed slightly longer than the width of the pipe and press the fitting piece in the direction of the tube axis, move the fitting piece inward to compress the backing tightly, and the fitting piece comes to the position of the top groove. At this time, the wedge is pressed to expand the fitting piece and fit it into the blow-stop area of the socket.

In this case, the pressing force of the fitting piece required to compress and seal the backing is extremely large, and this is an inappropriate structure especially when a hard backing is used.

Furthermore, simply fitting a wedge into the gap between the fitting pieces will cause complex forces to act on the joint underground.
For example, if a force such as twisting is applied to the fitting piece, there is a risk that the wedge may come off unexpectedly, and the reliability cannot be said to be sufficient.

The object of the present invention is to provide a separation-preventing pipe joint that allows easy joint joining work and provides a reliable separation-prevention function.

In order to achieve the above object, the present invention has a sealing material interposed between the inner surface of the socket at an intermediate position on the back side of the socket from the opening end of the socket and the outer surface of the socket, and A lock ring that is split in the circumferential direction to be fitted into an annular groove provided, and a distal end portion formed in a tapered shape with both sides tapered to the tip intervenes between the split ends of the lock ring from the opening end of the socket. and a fixing piece whose other end is fixed to the socket opening end face with a bolt, and a protrusion provided on the outer surface of the socket between the sealing material and the lock ring so as to be engageable with the lock ring. This is what I did.

An embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a socket, and 2 a socket. A rubber annular sealing material 3 is attached to the inner surface of the deep part of the socket 1, and the inner surface of the sealing material 3 is pressed against the outer surface of the socket 2.

Reference numeral 4 denotes a protrusion that protrudes from the inner surface of the socket 1 and engages with the sealing material 3.

An annular protrusion 5 is provided on the outer surface of the socket 2 at a position closer to the opening of the socket 1 than the sealing material 3, and a lock ring 6 that engages with the projection 5 is attached to the open end of the socket 1. It is fitted into an annular groove 7 provided on the inner surface nearby.

The lock ring 6 is formed into one piece in the circumferential direction, and has a biasing force for expanding the diameter.

A guide groove 8 provided on the inner surface of the socket 1 opens into the annular groove 7 from the open end surface 9 of the socket 1, and the tip 10a of the fixing piece 10 fitted into the guide groove 8 separates the lock ring 6. It is interposed between the ends 6a and 6b.

Both side surfaces of the tip 10a of the fixing piece 10 are formed into a tapered shape.

Further, a protruding wall portion 10b is provided at the end of the fixed piece 10 that protrudes from the socket opening end surface 9, and a bolt 12 that is implanted in a screw hole 11 of the socket opening end surface 9 and inserted through the projecting wall portion 10b. The fixing piece 10 is fixed with a nut 13 screwed onto the bolt 12.

To explain the joining operation, first, the sealing material 3 is attached to the intermediate position of the socket 10, and the insertion port 2 is inserted into the socket 1.

Thereafter, the lock ring 6 is pushed into the gap between the socket 1 and the socket 2 from the outside of the socket 1, and the lock ring 6 is inserted into the annular groove 7.

At this time, if the lock ring 6 has a diameter expansion biasing force, the lock ring 6 expands due to the diameter expansion bias force and enters the annular groove T.

Note that the lock ring 6 is placed on the outer surface of the socket 2 in advance before the socket 2 is inserted into the socket 1.

After arranging the lock ring 6 in this way,
Insert the fixing piece 10 into the guide groove 8 and push the tip 10a of the fixing piece 10 between the split ends 6a and 6b of the lock ring 6, thereby expanding the diameter of the lock song 6 until it comes into contact with the bottom surface of the annular groove 7. and fix the fixing piece 10 with the nut 13.

The fixing piece 10 may be pushed in by threading the nut 13, or the nut 130 may be tightened after the fixing piece 10 is pushed in with an appropriate jig.

In this way, by pushing the tip 10a of the fixing piece 10 between the split ends 6at6b of the lock ring 6, the lock ring 6 can be easily fitted into the annular groove 7 to a predetermined depth, and the lock ring 6 can be easily fitted. Separation of the annular groove 7 due to the predetermined diameter reduction is prevented. Therefore, separation between the sockets 1 and 2 can be reliably prevented by engagement between the lock ring 6 and the protrusion 5 of the sockets 2. .

Further, since the fixing piece 10 is inserted from the socket opening end face 9 and fixed to the opening end face 9, the fixing piece 10 can be easily attached, and the fixing piece 10 does not come off accidentally, and the lock ring It is certain that the expanded diameter of 6 is maintained.

FIG. 5 shows another embodiment, in which instead of providing the guide groove 8 of the above embodiment, a fixing piece 10 is fixed in contact with the inner surface of the socket 1, and in this case, the same method as above is used. Each effect can be obtained.

As described above, according to the present invention, the sealing material is interposed between the inner surface at the intermediate position of the receptacle and the outer surface of the receptacle, so installation of the sealing material is completed by inserting the receptacle, and the fitting of the sealing material into the annular groove of the lock ring is completed. This is easy because it can be done regardless of the sealant.

Moreover, since the tip of the fixing piece is tapered on both sides, it is easy to push it between the split ends of the lock ring, and the other end of the fixing piece can be received easily. Since it is fixed to the end face of the mouth opening with bolts, the fixing piece will not come off unexpectedly from the lock ring due to its tapered tip, and the diameter of the lock ring will be reliably maintained.

Furthermore, there is an advantage that the fixing piece can be easily pushed into the space between the divided ends of the lock ring by using the bolt.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of a pipe joint, Fig. 2 is a partial front view of the same, Fig. 3 is a partial sectional view taken along line I-I in Fig. FIG. 5, which is a diagram showing the relationship between the fixing piece and the inner surface of the socket, is a partial vertical sectional view of a pipe joint in another embodiment. 1... socket, 2... insertion, 3...
... Seal material, 5 ... Protrusion, 6 ... Lock ring, 7 ... Annular groove, 8 ... Guide groove, 9 ... ...Opening end face, 10...Fixing piece, 12...Bolt.

Claims (1)

[Scope of utility model registration request] A sealing material interposed between the inner surface of the socket at an intermediate position on the back side of the socket from the opening end of the socket and the outer surface of the socket, and a circumferential direction 1 that is fitted into an annular groove provided on the inner surface near the opening end of the socket. A split lock ring and a tapered tip with both sides tapered are inserted between the divided ends of the lock ring from the socket opening end side, and the other end is bolted to the socket opening end face. A detachment prevention pipe joint characterized in that it has a fixing piece that is fixed to the lock ring, and a protrusion that is provided on the outer surface of the insertion port between the sealing material and the lock ring so as to be able to be secured to the lock ring.