초록 ▼

The invention relates to a flexible tubular conduit having at least one tubular layer constituted by at least one molded strip of a cross section substantially in the form of an elongated S, wound helically and having a cross section formed of a first and of a second principal cylindrical coaxial sp

The invention relates to a flexible tubular conduit having at least one tubular layer constituted by at least one molded strip of a cross section substantially in the form of an elongated S, wound helically and having a cross section formed of a first and of a second principal cylindrical coaxial spans joined together by an inclined central portion, each of the first and second principal cylindrical spans being united by a first convex radial portion to a first secondary cylindrical span and by a second convex radial portion to a second secondary span. The second secondary span comprises a section connecting to the second convex radial portion (9), an end section (12) and a like intermediate section (13) whose concavity is turned away from the second principal span (6), and the second secondary span (12, 13) is arranged such that, when the strip is in the wound state, the connecting section is thrusting against the first principal span (5') of an adjacent spiral, and the end section (12) applies itself to the said first principal span (5')

대표청구항 ▼

[ We claim:] [1.] A crush resistant flexible tubular conduit capable of withstanding high external hydrostatic pressures comprising at least one tubular layer constituted by at least one profiled ban having a cross-section substantially in the shape of an elongated S, wound helically with a small pi

[ We claim:] [1.] A crush resistant flexible tubular conduit capable of withstanding high external hydrostatic pressures comprising at least one tubular layer constituted by at least one profiled ban having a cross-section substantially in the shape of an elongated S, wound helically with a small pitch and with interlocking of successive turns, the profiled band having a cross-section formed from first (5) and second (6) main portions which are cylindrical, coaxial, radially spaced and joined by a central portion (7) inclined in relation to the longitudinal axis of the conduit, each of the first and second main cylindrical portions being joined by a first convex radial portion (8) to a first cylindrical secondary portion (10) and by a second convex radial portion (9) to a second secondary portion (11, 12, 13), and the first secondary portion being radially spaced from the first main cylindrical portion by a distance such that, in the helically wound state of the profiled band, it is substantially applied over its entire length against the second main portion of an immediately adjacent turn (6"), wherein the second secondary portion comprises a section (11) connecting a discrete end section (12) to the second convex radial portion (9) through a wave-shaped intermediate section (13) which is in contact with a first secondary portion (10') of another immediately adjacent turn and which has a concavity directed away from the second main portion (6), and wherein the second secondary portion (11, 12, 13) is arranged so that in the wound state of the band said connecting section (11) bears on the first main portion (5') of the other adjacent turn, characterized in that, in the wound state of the band the discrete end section (12) bears, in face-to-face contact at its end surfaces remote from the intermediate section on the first main portion (5') of said other adjacent turn.