US Patent 7591488 Fitting particularly for high-pressure pipes

A pipe end centered on an axis is formed with a radial outward enlargement having an axially inwardly directed face lying in a plane perpendicular to the axis. An annular reinforcement fitted in the enlargement is braced radially outwardly thereagainst and has an axially outwardly directed front end face lying in a plane perpendicular to the axis and axially outward of the inwardly directed enlargement face. A nut bears axially outwardly on the axially inwardly directed enlargement face. A connector engaged by the nut is pressed thereby axially inward against the axially outwardly directed reinforcement face.