JPS5851489Y2 - Fittings for oval pipes - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint for an oblong tube made of hard plastic.

A hard plastic pipe with an oval cross-section, especially an oval-shaped pipe, has a lower water flow rate than a circular pipe when the long axis of the cross section is vertical, even for the same amount of water. It is used in drainage pipes and the like because it can strengthen the force of solid matter and is therefore effective in preventing solid matter from accumulating in pipes.

Pipe joints are generally used to connect the above-mentioned oval pipes for piping, and these pipe joints are
In its cross section, the inner contour is made almost equal to the outer contour of the oval tube section fitted therein, and
The joint socket is tapered at the same angle of inclination over the entire circumference of the joint socket so that the pipe socket fits tightly into the joint socket.

However, when connecting a conventional oval pipe and its joint as described above, the resistance during insertion is unexpectedly strong, and if the size and wall thickness of the pipe are slightly larger, it becomes difficult for the operator to manually insert the pipe. It turns out that there is a problem.

The present invention was made with the aim of solving the above-mentioned problems and providing a joint that can easily connect hard plastic oval pipes by hand. A taper is provided on the inner surface of the fitting socket for a hard plastic oval pipe which is made into an oval shape and is in contact with the outer surface of the oval pipe to be inserted. The inclination is changed in the circumferential direction, and the inclination is large in the part that contacts the small diameter side of the elliptical tube, and the inclination is small or the inclination is made small in the part that contacts the large diameter side of the elliptical tube. A fitting for an oval tube made of hard plastic, characterized by the fact that it is not

The joint of the present invention will be explained below with reference to the drawings.

FIG. 1 is a perspective view showing an example of the joint of the present invention, and 1.1
'' is a socket of a hard plastic joint, and this joint socket has an egg-shaped cross section so that a similarly shaped hard plastic pipe can be inserted and connected thereto.

FIG. 2 is a sectional view taken along the line A-A of the joint shown in FIG. It is possible to connect pipes of the same size.

FIG. 2 shows an annular protrusion provided in the circumferential direction of the joint, and is for regulating the position of the inserted tube end.

3 is a sectional view taken along the line B-B of the joint shown in FIG. 1, and the joint is provided with sockets 1, 1' and an annular protrusion 2 in the same manner as in FIG. 2. .

3 is a taper provided on the inner surface of the socket which contacts the outer surface of the oval tube to be inserted.

In this embodiment, as shown in Fig. 3, the taper 3 is provided on the inner surface of the socket that contacts the small diameter side of the oval pipe, but as shown in Fig. 2, the taper 3 is provided on the large diameter side of the oval pipe. It is not provided in the part that touches the.

In addition, in the present invention, a taper may also be provided in the portion in contact with the larger diameter side, but in that case, the slope of the taper must be smaller than the inclination of the taper provided in the portion in contact with the small diameter side. is necessary.

As mentioned above, in the joint of the present invention, the inner surface of the joint socket, which is in contact with the outer surface of the hard plastic oval tube to be inserted into the socket, has a taper whose inclination changes in the circumferential direction as described above. This makes it possible to easily manually insert the oblong tube into the joint.

That is, the taper of the socket part that contacts the small diameter side of the pipe is large, and the taper of the part that contacts the large diameter side of the pipe is small or has no slope. When a circular tube is inserted, the small diameter side of the tube is inserted so that it is reduced by a taper, but the tube is made of plastic and can be deformed, and the small diameter side of the oval tube is relatively small. Since it can be deformed by force, it deforms along the taper.

On the other hand, reducing and deforming the large diameter side of an elliptical tube requires approximately twice the deformation force as when deforming the small diameter side, but the taper on the large diameter side is small or there is no taper. Therefore, when inserting the pipe into the joint socket, the deformation of the larger diameter side of the pipe insertion port is small, and the increase in insertion force is small.

In this way, the joint of the present invention cleverly utilizes the ease of deformation on the large diameter side and small diameter side of the hard plastic oval pipe to firmly insert the pipe into the joint socket with a small insertion force. They can be fitted together.

On the other hand, in a tube with the same taper in the circumferential direction, the deformation on the small diameter side and the deformation on the large diameter side are at the same rate, so the insertion force is large, 3.5 mm), but it was not possible to insert it all the way to the back of the socket by hand.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of the joint of the present invention, Fig. 2 is a cross-sectional view taken along the line A-A of the joint shown in Fig. 1, and Fig. 3 is a cross-sectional view taken along the line B-B of the joint shown in Fig. 1. It is. 1.1'...Socket, 2...Annular protrusion, 3...Taper.

Claims (1)

[Claims for Utility Model Registration] 1. A joint socket for an elliptical tube made of hard plastic having an elliptical cross section, the inner surface of which is in contact with the outer surface of the elliptical tube to be inserted into the joint socket is tapered. is provided, the taper has an inclination that changes in the circumferential direction of the socket,
A hard plastic characterized in that a portion in contact with the small diameter side of the oval tube has a large inclination, and a portion in contact with the large diameter side of the oval tube has a small inclination or no inclination. Fittings for manufactured oval pipes. 2. The joint according to item 1, wherein the oval tube has an egg-shaped cross section.