Spherical universal pipe joint made of synthetic resin

Abstract

A spherical universal pipe joint made of synthetic resin can freely rotatably connect a sleeve and a plug, wherein, the universal pipe joint comprises a sleeve joint of the sleeve which one end has a partly spherical inner surface, and a plug joint of the plug which one end has a partly spherical outer surface consistent with the spherical inner surface of the sleeve. The spherical universal pipe joint consists of an annular inner side wall part disposed inside a joint connecting part to maintain that the inner side section of the joint connecting part surrounded by the sleeve and the plug is substantially same as that of a joint straight pipe part, and the annular inner side wall part can freely rotate together with the rotation of the sleeve and the plug. Accordingly, sewage is prevented from detaining and the pipe line can be made smooth even the direction of the joint is freely changed.

Description

technical field [0001] The present invention relates to a universal joint (hereinafter referred to as "spherical universal joint") having a partially spherical surface as a sliding surface. Background technique [0002] In general, to connect synthetic resin pipe bodies, that is, polyvinyl chloride (hereinafter referred to as "PVC") pipes, or to connect PVC pipes to synthetic resin drainage buckets, that is, to connect PVC buckets. to the pipe fitting. [0003] The universal joint is generally known to be roughly divided into a spherical universal joint similar to a spherical joint (refer to Unexamined Publication No. 63-24484), and a joint of oblique flanges and two PVC pipes having a flexible connection angle. , The so-called flange-shaped universal joint (refer to the official publication No. 57-34391 and the official publication No. 6-80092). [0004] The advantages and disadvantages of these universal pipe joints are described below. [0005] The former can have flex...

AI Technical Summary

Problems solved by technology

[0017] However, with these conventional ball universal joints, there are steps or bends on the bottom of the pipe used before making its direction freely changeable, such as these ball universal joints, since not only for connecting angles or directionality It is also sometimes used to deal with piping errors or complex piping projects, so sometimes it is desirable to have no such steps or bends after the piping is completed, and sometimes it is not desirable to insert cleaning tools from the downstream side

[0018] In addition, any of the universal pipe joints of the above classification will produce unevenness on the inner surface of the pipe when the direction is freely changed, and the cross-sectional area of ​​the pipe will also change accordingly. When one connection part of the pipe joint is angularly displaced upward from the horizontal state, there is a problem that dirt is accumulated on the bottom side of the pipe and the narrow part of the pipe such as the core protrudes toward the top side of the pipe.

Images