Pipe joint for connection of corrugated tube

A pipe joint for connecting a flexible corrugated tube, the tube having a free end and alternate ridges and valleys at its outer peripheral surface adjacent the free end, the joint comprising:

• a joint body having an axial through bore and a threaded portion;
• a sleeve received in said through bore for holding the free end of the flexible corrugated tube;
• and
• a nut threadedly fitted in said threaded portion of said joint body;
• said joint body having a shoulder formed on an inner surface of said through bore, said shoulder having a sealing surface directed toward one end of said through bore for abuttingly engaging the free end of the tube when the tube is fully inserted, a tapering surface being formed on the inner surface of said through bore in adjacent relation to said shoulder, said tapering surface being decreasing in diameter progressively toward said shoulder, and a radially inwardly-open, annular groove formed in the inner surface of said through bore in adjacent relation to said tapering surface;
• said sleeve having projections extending radially inwardly from one end thereof facing said shoulder, said sleeve having an end surface at the other end thereof, and said projections being pivotally movable resiliently relative to the remainder of said sleeve so as to be received in a predetermined one of the valleys in the outer peripheral surface of the flexible corrugated tube when the tube free end is fully inserted;
• and
• said nut having means for holding outer surfaces of said projections of said sleeve in registry with said annular groove during insertion of the tube free end, said annular groove being sized radially to accept pivoting movement of said projections during passage of at least the ridge adjacent the tube free end, said nut having a flange surface for abutment against said end surface of said sleeve, wherein when the nut is tightened following full insertion of the tube free end, said sleeve is caused to move axially relative to said joint body, said projections are caused to pivot inwardly by engagement with said tapering surface, and at least the ridge adjacent the tube free end is compressed between said sealing surface and said projections.