Patent ID: RE43942

Claim:
Reinforced flexible hose, comprising: at least one inner tubular layer ( 2 ) of plastic or rubber which has an outside (φ e ) diameter and a longitudinal axis (Y); a chain knitted-type reinforcement layer ( 3 ), which has rows ( 4 ) of substantially parallel stitches and lines ( 5 ) of substantially parallel stitches, with respective stitch counts per unit length (N m , N r ) in a longitudinal direction; said knitted reinforcement layer ( 3 ) being provided in the form of a single tubular layer and being formed on the outer surface of said inner tubular layer ( 2 ) coaxially thereto; said rows ( 4 ) of stitches and said lines ( 5 ) of stitches being substantially helical with respective longitudinal pitches (P m , P r ) and inclinations (α, β) which are mutually opposite with respect to the longitudinal axis (Y), so as to eliminate the torque applied by-the pressure of the fluid inside it; and an outer layer ( 6 ) which is superimposed on said reinforcement layer ( 3 ) to protect it; characterized in that the longitudinal pitch (P r ) of said lines ( 5 ) of stitches is substantially proportional to the square of the outside diameter (φ o ) of said inner layer ( 2 ).