Patent ID: 7341284

Claim:
A joint assembly for flexible and semi-rigid piping, comprising: a) a joint end sleeve comprising first, second and third co-axial sections of circular cross-sections and a fourth section for connection to a piping system, said joint end sleeve including a passing duct; b) said first section including a truncated-cone shaped end having a narrower external end of an outside diameter slightly smaller than the inside diameter of the piping; c) said second section being axially adjacent to a larger diameter base of said truncated-cone shaped end, said second section including a cylindrical section with an outside diameter smaller than the outside diameter of said larger diameter base, resulting in the rise of a throat between said larger diameter base and said cylindrical section; d) said third section being axially adjacent to said cylindrical section, said third section including a threaded section, said third section forming an annular radial surface next to said cylindrical section; and e) a nut made of a material harder than one used in the piping and with a higher or equal hardness than one used in said joint end sleeve, said nut having an internal threaded surface complementary to said threaded section, said nut including an internal cylindrical surface of a diameter slightly larger than the outside diameter of the piping, said internal threaded surface having an average diameter slightly larger than the diameter of said internal cylindrical surface, said nut including an annular radial surface formed between said internal threaded surface and said internal cylindrical surface, said internal cylindrical surface for compressing the piping when said joint end sleeve is inserted into the piping and said nut is tightened until said annular radial surface of said nut contacts said annular radial surface of said third section.