JPH041432Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a synthetic resin pipe connection portion in which a synthetic resin pipe socket is inserted into a synthetic resin pipe socket via a sealing gasket.

[Conventional technology]

Conventionally, in the connection of synthetic resin pipes where the synthetic resin pipe socket was inserted into the synthetic resin pipe socket via a sealing gasket, measures were taken to prevent the socket from coming off from the socket, for example. As described in Japanese Patent Publication No. 86814/1983, a lock ring is known that is engaged with a groove provided on the inner surface of the receptacle and the outer surface of the receptacle.

[Problem that the invention attempts to solve]

However, in such conventional synthetic resin pipe connections, the processing to form the groove on the inner surface of the socket is not easy because it is long, and the dimensional accuracy of the groove cannot be expected to be very high. , Therefore, the engagement of the locking ring is easy,
There was a drawback that the socket easily fell out.

Furthermore, since a concave groove is formed in the socket, the thickness of the socket becomes thinner, which poses a problem in terms of strength.

[Means for solving problems]

The present invention solves the above-mentioned drawbacks of the conventional synthetic resin pipe connections, and the concave groove for lock ring engagement has high dimensional accuracy, lock ring engagement is tight, and the socket can be easily removed from the socket. Without a doubt,
The purpose is to provide a connection part for synthetic resin pipes that does not cause the wall thickness of the socket to become thin. At the connection part of the inserted synthetic resin pipe, a synthetic resin lock ring locking split tube is inserted between the inner surface of the parallel part on the back side of the sealing gasket attachment part of the socket and the outer surface of the socket, and the split tube is inserted. A synthetic resin pipe connecting portion is characterized in that a synthetic resin lock ring is engaged with the synthetic resin lock ring spanning a concave groove provided on the inner surface of the pipe and the outer surface of the insertion port.

Hereinafter, the present invention will be explained in more detail based on the embodiments shown in FIGS. 1 and 2.

In Figures 1 and 2, reference numeral 1 designates one of the two synthetic resin pipes to be connected, which is made of synthetic resin such as hard vinyl chloride resin, and has a socket 11 formed at one end. ing. Reference numeral 2 designates the other synthetic resin pipe, which is made of synthetic resin such as hard vinyl chloride resin, and one end of which is a socket 21, the tip of which is chamfered. It has been inserted.

A portion near the end of the socket 11 is bulged outward to form a groove 21 on the inner surface, and a sealing gasket 3 made of rubber is attached to this groove 12. The packing 3 is compressed between the groove 12 and the insertion port 21 and maintains watertightness. Groove 12 where packing 3 is installed
The inner surface of the socket 11 on the deeper side is substantially parallel.

Reference numeral 4 denotes a split cylinder for locking the lock ring inserted deep into the packing 3, and as shown in FIG. 2, a part of the cylinder wall is cut out parallel to the center axis. The split tube 4 is made of the same hard vinyl chloride resin as the synthetic resin pipes 1 and 2, and a groove 41 is bored in the inner surface of the split tube 4.

5 is a lock ring, which is made of the same hard vinyl chloride resin or polyethylene as the synthetic resin pipes 1 and 2. The lock ring 5 is engaged so as to straddle between a groove 41 on the inner surface of the split tube 4 and a groove 22 formed near the tip of the socket 21.

To assemble such a connecting part of the present invention, the diameter of the split tube 4 is reduced, and the split tube 4 is inserted deep into the socket 11.
The sealing gasket 3 is fitted into the groove 12, the lock ring 5 is deformed and fitted into the groove 41 of the split tube 4, and the insertion port 21 is inserted into the socket 11. The lock ring 5 is engaged across the groove 22 of the insertion port 21.

[Effect]

In the present invention, a synthetic resin split tube for lock ring is inserted between the inner surface of the parallel part on the back side of the sealing gasket attachment part of the socket and the outer surface of the socket, and the inner surface of the split tube and the outer surface of the socket are inserted. Since the synthetic resin lock ring is engaged across the concave groove provided in the pipe, even if internal pressure is applied to remove the socket in the direction of the pipe axis, the socket will not move in the direction of the socket opening together with the lock ring and split tube. As it moves, the end face of the split tube hits the sealing gasket, and the force of trying to pull out the socket is alleviated by the elasticity of the sealing gasket, and the socket does not easily come out from the socket.

Watertightness between the socket and the socket is maintained by the seal.

[Effect of idea]

In the present invention, the groove for locking the lock ring is provided on the inner surface of the split tube, and since the split tube is made of synthetic resin, this groove can be easily formed with a lathe or the like with good dimensional accuracy. can. or,
Since it is a split tube, the split tube can be inserted between the inner surface of the socket and the outer surface of the socket even after processing the socket (that is, before connection). Therefore, the conventional socket processing mold can be used as is, and the wall thickness of the socket does not change at all, so there are no problems with strength.

Furthermore, since the split tube is inserted between the inner surface of the parallel part on the back side of the sealing gasket attachment part and the outer surface of the socket, a pull-out force (internal pressure or external load) may be applied to the socket. Also, the socket moves along the inner surface of the parallel part of the socket to the socket opening side together with the locking ring and the split tube, and the end surface of the split tube hits the sealing gasket, and the pulling force acting on the socket is applied to the seal. The elasticity of the gasket prevents the socket from coming off.

Furthermore, since both the lock ring and the split tube are made of synthetic resin, the socket and insertion port of the synthetic resin pipe will not be damaged.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a partially cutaway perspective view showing an example of a split tube used in the connecting portion of the present invention. 1, 2...Synthetic resin pipe, 11...Socket, 12...
... Socket, 3... Seal gasket, 4... Split tube,
5...Rock Ring.

Claims (1)

[Scope of utility model registration request] At the connection part of the synthetic resin pipe where the synthetic resin pipe socket is inserted into the synthetic resin pipe socket via the sealing gasket, the inner surface of the parallel part on the back side from the sealing gasket attachment part of the socket and the external surface of the socket. A synthetic resin lock ring locking split tube is inserted between the split tube and the groove provided on the inner surface of the split tube and the outer surface of the insertion opening, and the synthetic resin lock ring is engaged with the split tube. Connection part of synthetic resin pipe.