Method of making reinforced corrugated hose

Claim 1

THE METHOD OF MAKING A REINFORCED CORRUGATED HOSE WHICH COMPRISES POSITIONING A REINFORCEMENT COMPRISING A HELICAL WIRE COVERED WITH A LAYER OF ELASTOMERIC MATERIAL OVER THE CREST OF THE CORRUGATIONS OF A MANDREL HAVING A RIGID CORRUGATED MOLDING SURFACE SO THAT SAID REINFORCEMENT IS ENGAGED BY THE CRESTS AND RETAINED IN POSITION THEREBY, POSITIONING OVER SAID REINFORCEMENT AND OVER SAID MANDREL A TUBULAR LAYER OF AT LEAST PARTIALLY INCURED ELASTOMERIC MATERIAL, SAID MANDREL HAVING A HOLLOW BORE AND HAVING PASSAGES EXTENDING THEREFROM TO THE CORRUGATED SURFACE THEREOF, SUBJECTING THE RESULTING ASSEMBLY TO HEAT TO EFFECT CURING OF THE ELASTOMERIC MATERIAL WHILE AT THE SAME TIME CREATING A DIFFERENTIAL PRESSURE AROUND THE MANDREL TO FORCE THE LAYER OF ELASTOMERIC MATERIAL INTO SURFACE CONTACT THEREWITH AND WITH SAID REINFORCEMENT, CONTINUING THE APPLICATING OF HEAT AND DIFFERENTIAL PRESSURE UNTIL CURING OF THE ELASTOMERIC MATERIAL IS EFFECTED, AND THEREAFTER REMOVING THE FINISHED HOSE FROM THE MANDREL.