Patent ID: 9388927
Filing Date: 2016-07-12
CPC Classification: F16L

Claim Text:
1. A polymer pipe joint assembly comprising a fitting positioned inside of the polymer pipe, and a coupling over the pipe and fitting, the coupling comprising several cylindrical sections of different inside diameter, decreasing from a front towards an opposite end part of the coupling, coupled to each other with conical sections, wherein a lead-in chamfer is formed on an inside surface of a front cylindrical section of the several cylindrical sections, wherein the assembly has a sleeve positioned between the pipe and the coupling and comprises several cylindrical sections with different outside diameter, decreasing from a front towards an opposite end part of the sleeve, coupled to each other with conical sections, wherein there is a chamfer on the outside surface of the end part, wherein the sleeve is made of hard polymer materials and a plurality of cuts and grooves included along a sleeve axis, providing a change of at least one of geometric dimensions or shape of the sleeve, the fitting having a shoulder on its outside surface, which restricts movement of the pipe and sleeve.