Connectors for plastic hose

Claim 1

A COUPLING FORM MECHANICALLY LOCKING A HOSE OF SYNTHETIC RESINOUS PLASTIC MATERIAL THERETO WHEREIN SAID PLASTIC MATERIAL HAS INHERT COLD FLOW PROPERTIES AND SAID COUPLING PREVENTS COLD FLOW OF THE HOSE RELATIVE THERETO WHEN THE COUPLING IS COMPLETELY ASSEMBLED ON THE HOSE, SAID COUPLING COMPRISING A CONNECTOR MEMBER, A HOLLOW TAIL MEMBER EXTENDING FROM SAID CONNECTOE MEMBER AND IN SERTED INTO AN END OF THE HOSE, AND A FERRULE ENCIRCLING THE END OF THE HOSE AND CLAMPING SAME ON THE TAIL MEMBER, SAID TAIL MEMBER HAVING AN INSIDE DIAMETER SUBSTANTIALLY EQUAL TO THE NORMAL INSIDE DIAMETER OF THE HOSE WHEREUPON THE END OF THE HOSE MUST BE STRETCHED TO AN INCREASED DIAMETER FOR INSERTION OF THE TAIL MEMBER THEREIN, SAID TAIL MEMBER HAVING AT LEAST ONE RAZOR-SHAPED CIRCUMFERENTIAL EDGE EXTENDING OUTWARDLY THEREFROM GRIPING THE STRETCHED END OF THE HOSE, SAID CIRCUMFERENTIAL RIDGE BEING TRIANGULAR IN CROSS-SECTION WITH A FORWARD SIDE THEROF FACING THE END OF THE HOSE BEING STEEPLY SLOPED SUBSTANTIALLY NORMAL TO THE LONGITUDIANL AXIS OF SAID COUPLING AND WITH A REARWARD SIDE THEREOF REMOTE FROM THE END OF THE HOSE BEING SHALLOWLY SLOPED, SAID CIRCUMFERENTIAL RIDGE HAVING A RADICAL THICKNESS EQUAL TO SUBSTANTIALLY ONE-THIRD THE WALL THICKNESS OF SAID HOSE, CYLINDRICAL SURFACES JOINING THE INNER ENDS OF SAID FORWARD AND REWARD SIDES OF SAID RIDGE, SAID CYLINDRICAL SURFACES HAVING AN AXIAL WIDTH AT LEAST AS GREAT AS THE AXIAL WIDTH OF SAID CIRCUMFERENTIAL RIDGE, MEANS PROJECTING OUTWARDLY FROM SAID CYLINDRICAL SURFACES ENGAGING THE HOSE AND PREVENTING