Patent ID: 7014216

Claim:
A joint assembly for flexible and semi-rigid piping, comprising: a) a joint end sleeve comprising first and second co-axial sections of circular cross-sections, a third section, 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 having an outer cylindrical surface with an outside constant 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 immediately axially adjacent to said cylindrical section and forming an annular face; 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 with a diameter slightly larger than the diameter of the piping, said nut pressing the piping against said truncated cone shaped end when said joint end sleeve is inserted into the piping; f) said third section including a periphery larger than said diameter of said nut such that said annular face provides a stop to said nut; and g) said throat, said stop and said internal threaded surface are spatially configured relative to each other such that a portion of said internal threaded surface overlays said throat and compresses the piping against said throat when said nut engages said stop.