Flexible tubular device

Claim 1

An improved high pressure flexible, metal tube effective for internal and external high pressure, comprising: (a) A liquid impervious metal, convoluted, flexible circular tube, constructed and arranged to withstand high pressure fluid therein, and presenting a continuous and unbroken exterior surface. (b) End connectors integrally attached in liquid tight relation to the ends of said metal convoluted tube, including a straight heavier wall pipe section adjacent to each end of said convoluted tube and extending outwardly with a generally smooth tubular exterior surface at least about the distance equivalent to the distance of three convolutes. (c) an integral body of soft, flexible non-porous elastomeric material completely filling the exterior space between the convolutes of the convoluted tube and sealed and bonded to substantially the complete exterior surface of said circular tube, said integral body of soft, flexible elastomeric material extending radially outwardly a substantial distance beyond the outer diameter of the convolutes to provide a relatively thick scuff coating over the metal convoluted tube, and (d) said integral body of soft, flexible elastomeric material further including end portions extending axially in both directions from said convoluted tube along said pipe sections for a distance of from 2-10 convolutes, said end portions of said body of elastomer material circumferentially enclosing said pipe sections, having a thickness approximately equal to said scuff coat over said convolutes, and being securely bonded to said pipe sections over the complete exterior surface thereof engaged by said end portions, whereby said integral body of elastomeric material permits flexing of the convoluted tube while distributing the produced stresses over the entire area of the convolutes and into said pipe sections.