Patent ID: 7488009

Claim:
A pipe joint, comprising: a joint main body having a joining hole with an inside surface configured to receive a pipe and a threaded part formed on an outer surface; a nut threaded onto said threaded part in a threaded slate; and a sleeve dimensioned to be received in said joining hole to a specific position when the nut is in the threaded state and said pipe is inserted in said joining hole such that said nut retains said pipe in said joining hole via said sleeve tightly engaging said pipe and said joint main body by the threading of said nut onto said threaded part to the threaded state, with the sleeve being deformed to expand radially outward, and to prevent subsequent insertion of said sleeve into said joining hole to the specific position in a subsequent unthreaded state in which said pipe and said sleeve have been pulled out from said joining hole after said nut has been threaded onto said threaded part to reach the threaded state in which the sleeve has been deformed, said sleeve having a radially external portion with a split-level part, with said split-level part being engageable on said joint main body such that insertion of said sleeve into said joining hole to the specific position is prevented after said sleeve has been deformed by said nut being in said threaded state, said joint main body having a split part that engages said split-level part of said sleeve when said sleeve is reinserted after said sleeve has been deformed by said nut being in said threaded state.