Composite tubing

Claim 1

A flexible composite tubing for high-pressure fluid media of uniform construction and properties which effectively absorbs shock during high-pressure fluid transmission by internal movement of its components to provide improved fatigue resistance in high-pressure usage comprising, a thermoplastic, extruded, polymeric inner cope tube; a nonwoven reinforcement sleeve unit overlying said inner core tube comprised of at least two circumferentially superposed layers of helically wound, laterally contiguous strands of synthetic polymeric fibers, each of said layers generally defining an annular layer which is generally free of interweaving and interwining both with respect to itself and with respect to its adjacent associated layer. The strands of one layer being oppositely wound with respect to the strands of the other layer, the strands within each layer being bonded to each other with a synthetic elastomeric polymeric material, and the two layers being interfacially bonded to each other with a synthetic elastomeric polymeric material to substantially preclude slippage therebetween; A thermoplastic, polymeric outer sheath generally interfacially bonded to the reinforcement sleeve with a synthetic elastomeric polymeric material to substantially preclude slippage between said outer sheath and said reinforcement sleeve; and the inner core tube being generally free of bonded securement to the reinforcement sleeve to provide slippage between said reinforcement sleeve unit and said inner core tube along the outer face of the inner core tube only, thereby improving resistance to fatigue from flexing during high-pressure fluid transmission.