JPS643900Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe joint adapter for a plastic pipe, particularly for a drainage pipe for rainwater, underground water, etc.

As is well known, drainage pipes are pipes with many holes on the pipe surface that allow water to pass through but do not allow sand or stones to pass through (for example, pipes made of cloth, foam sheets with burst bubbles, or covered pipes). ) is buried in the soil of fields and grounds to drain rainwater and groundwater. Since these drainage pipes must be laid over a wide area, multiple pipes are usually installed in parallel. One end of these pipes must therefore be connected to the main drain.

In addition, such drainage pipes are provided with a spiral or axially spaced ring-shaped reinforcing material (hereinafter simply referred to as outer periphery reinforcing material) formed of relatively thick and strong strands on the outer periphery for both reinforcement and water permeability. in many cases.

The present invention provides a suitable pipe fitting adapter for connecting such a drain pipe to a main drain pipe, for example.

First, in order to better understand the present invention, the prior art will be explained with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, a branch pipe 1 branches off from a pipe joint A, into which a fitting portion 2 of an adapter, generally designated by reference numeral B, is inserted. This branch pipe 1 constitutes a pipe connection part. A pipe fitting part 3 is provided on the opposite side of the fitting part 2, and a second pipe fitting part 3 is provided on the opposite side of the fitting part 2.
As shown in the figure, a drainage pipe C having a reinforcing material 6 (in the illustrated embodiment, a spiral reinforcing material) on the outer periphery is fitted. This adapter B is provided with a discontinuous rib-shaped projection 5 on the inner peripheral surface of the fitting part 3, and this projection 5 engages with a reinforcing material 6 on the outer periphery, so that the drain pipe C does not come off from the adapter B. It's like this. This protrusion 5 has a spiral shape that engages with the reinforcing material 6 on the outer periphery if it is spiral, and the drain pipe C can be screwed onto the adapter B by rotating the drain pipe C around its axis. Further, when the outer circumferential reinforcing member 6 is ring-shaped and spaced apart in the axial direction, the drain pipe C may be pushed into the adapter B in the axial direction while elastically deforming the protrusion 5 and the reinforcing member 6.

However, in the above-mentioned conventional technology, when the drain pipe C is connected to the pipe joint A, the pipe joint A is fixed to the main drain pipe. The problem was that the drain pipe C was twisted, and as a result, the drain pipe C was damaged.

It is generally known to provide a T-shaped joint for branching pipes, as described in, for example, Japanese Utility Model Application No. 5814/1983. However, when installing a drain pipe, unlike the mechanical device described in the above-mentioned publication, the dimensional accuracy is relatively loose, and rather its workability and durability become problems.

In addition, the technique of providing a protrusion at the tip of the insertion part in order to connect the connecting pipe to the main body is, for example,
It is described in Publication No. 31959.

However, in the case of plastic drainage pipes, the pipe fittings installed on the main pipe are, for example, buried underground and therefore immovable, making it easy for workers to install the drainage pipe to be connected on site. You have to make sure that you get it. Regarding this point, the techniques of the above-mentioned Japanese Utility Model Application Publication No. 54-5814 and Japanese Utility Model Application Publication No. 56-31959 are not considered at all.

Further, as other prior art related to the present invention, there are Japanese Utility Model Publication No. 53-119022 and Japanese Utility Model Publication No. 42-515. However, these prior art techniques do not disclose any means for preventing the drain pipe from coming off after it has been installed.

The present invention was proposed in view of the problems of the conventional technology described above, and is a plastic pipe joint that does not apply torsional force to the drain pipe during installation work and that allows drain pipes to be easily and easily connected on site. The purpose is to provide an adapter.

According to the present invention, in a plastic pipe joint adapter for connecting a drainage pipe having a reinforcing material on the outer periphery to a branch pipe branching from a pipe joint, a cylindrical insert inserted into the connecting part of the branch pipe is provided. and a pipe fitting part into which a drainage pipe is fitted, a flange expanding radially outward is formed at the distal end of the insertion part, and a shoulder part connected to the fitting part is formed at the other end of the insertion part. The fitting ring interposed between the flange and the shoulder is frictionally engaged with the inner circumferential surface of the connection part of the branch pipe, and the insertion part is fitted between the flange and the shoulder. It is held so as to be rotatable relative to the ring, and the pipe fitting part is provided with a serrated protrusion that engages with the reinforcing material of the drain pipe. A taper is formed radially inward.

When connecting drain pipes using the pipe joint adapter of the present invention, the fitting ring is fitted into the insertion portion and then inserted into the inner circumferential surface of the branch pipe for frictional engagement. The mating ring will then fit tightly against the branch pipe, but the adapter will be held between the flange and the shoulder and will not move longitudinally, but will still be able to rotate. When the drain pipe is inserted into the fitting part, the reinforcing material provided on the outer peripheral surface of the drain pipe slides on the tapered surface of the protrusion and is inserted while slightly elastically deforming the protrusion, and is engaged by the claw action of the protrusion. . If twisting occurs in the drain pipe at that time, the twist in the drain pipe can be absorbed by rotating the adapter. In addition, a serrated projection is provided, and the taper of the projection is radially inward in the direction in which the pipe is inserted, so that the drainage pipe is elastically deformed together with the reinforcing material when the pipe is inserted. Therefore, it is easy to pull out the pipe, but if a force is applied in the direction of pulling out the pipe, the vertical part of the sawtooth (the part that vertically connects the end and start end of the taper) comes into contact with the reinforcing material of the drain pipe and drains the pipe. This prevents the pipe from coming off.

As described above, according to the present invention, drain pipes can be connected only by inserting an adapter and a drain pipe, so the work is simple and easy, and the twist that tends to occur in long drain pipes can be removed after connection. can. In addition, the present invention prevents the drain pipe from being accidentally removed.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 and 4.

The adapter B has a cylindrical insertion part 7 that is inserted into the inner circumference of the branch pipe 1 of the pipe fitting A, and a pipe fitting part 8 that fits the drain pipe C having a reinforcing material 6 on the outer circumference. Since the diameter of the insertion part 7 is smaller than the diameter of the fitting part 8, a shoulder part 11 is formed at the connecting part. A flange 9 that expands radially outward is formed at the tip of the insertion portion 7, and a shoulder portion 1
A fitting ring 10 is rotatably fitted on the outside of the insertion portion 7 between the insertion portion 1 and the flange 9. This flange 9 does not need to be provided on the entire circumference of the tip of the insertion portion 7, but may be provided partially, and its cross-sectional shape simply expands outward in the radial direction as shown in the lower part of Fig. 4. Alternatively, as shown in the upper part of FIG. 4, a tapered portion 9a may be provided to facilitate insertion of the fitting ring 10.

The outer peripheral surface of this fitting ring 10 is the pipe connecting portion 1
Therefore, when inserted, the pipe connecting portion 1 and the fitting ring 10 come into close contact with each other. For this reason, it is preferable that the fitting ring 10 be made slightly tapered. However, since the adapter B can rotate relative to the fitting ring 10, the drain pipe C attached to the adapter B can rotate relative to the pipe connection 1. Therefore, even if the drain pipe C is twisted, it can be untwisted by its rotation, making it easier to bury it in the soil. Furthermore, the connecting portion between the adapter and the pipe connecting portion is not damaged due to torsional force, and the drain pipe can be prevented from falling off or leaking.

Particularly when installing a drain pipe with a helical reinforcement, the drain pipe can be installed by rotating the adapter.

The protrusion 5 provided on the fitting part of the adapter B and protruding inward in the radial direction is tapered in the direction of insertion of the drain pipe C as shown in the figure, and the drain pipe C is elastically deformed.
to prevent it from coming off from adapter B.

Usually, the pipe fitting A, the adapter B and the drain pipe C are all made of plastic products. However, the material is not particularly limited to plastic; for example, the fitting ring can also be partially made of metal.

Furthermore, the drainage pipe C is not limited to the illustrated embodiment, and the reinforcing material 6 may be made by corrugating a part of the pipe and bulging outward in the radial direction. It is sufficient that it continuously and partially protrudes outward in the radial direction. Furthermore, instead of the strands constituting the reinforcing material, a mesh-like hole may be provided in a thick pipe, and the protrusion 5 may be engaged with the hole. That is, any drainage pipe C can be used as long as it can engage with the protrusion 5.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a pipe joint adapter according to the prior art, FIG. 2 is a sectional view thereof, FIG. 3 is an exploded perspective view showing an embodiment of the present invention, and FIG. 4 is a sectional view thereof. A... Pipe fitting, B... Adapter, C... Drain pipe, 1... Pipe connection part, 5... Protrusion, 6
... Reinforcement material, 7 ... Insertion part, 8 ... Pipe fitting part, 9 ... Flange, 10 ... Fitting ring.

Claims (1)

[Scope of utility model registration request] A plastic pipe fitting adapter for connecting a drainage pipe with a reinforcing material on the outer periphery to a branch pipe branching from a pipe fitting, which includes a cylindrical insertion part inserted into the connection part of the branch pipe, and a drainage pipe that connects the drainage pipe. A flange that extends outward in the radial direction is formed at the tip of the insertion part, and a shoulder part that connects with the fitting part is provided at the other end of the insertion part. The fitting ring interposed between the shoulder part is frictionally engaged with the inner circumferential surface of the connecting part of the branch pipe, and the insertion part is freely rotatable with respect to the fitting ring between the flange and the shoulder part. The pipe fitting part is provided with a serrated protrusion that engages with the reinforcing material of the drain pipe, and the protrusion tapers radially inward in the direction in which the drain pipe is inserted. A plastic pipe fitting adapter characterized by being formed with.