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Patent US4403631A successfully refreshed from Google Patents.
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US4403631A Expired / Lapsed US ⏱️ 0.0 years remaining

Flexible pipe

Assignee: Individual
•
Filing: 1980-09-01
•
Granted: 1983-09-13
•
Expires: 2000-09-01
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Abstract

Abstract A flexible pipe comprises an inner supporting pipe (1) made from an elastic material, onto which inner supporting pipe a shaped strip (2) is wound. Said strip (2) has a cross-section profile formed by two stepwise conjugated quadrangular flanges (3) and (4), the height of each of the flanges being equal to a half of the height of the profile. The adjacent turns of the strip (2) partially overlap each other so that the upper flange (3) of one turn is superimposed onto the lower flange (4) of the other flange, and the ends of the flanges (3) and (4) are aligned. An interlayer (5) made from an elastic material is superimposed onto the power frame formed by the strip (2). At least one pair of reinforcing layers (6) and (7) formed by groups of power filaments (8) and (9) is disposed on said interlayer (5), said filaments being parallel to one another and wound in contrary at angles of from 0 to 20° to the axis of the pipe. A protective shell (10 made from an elastic material is superimposed onto the pair of the reinforcing layers (8) and (9). A method of manufacturing a modification of a flexible pipe having an interlayer (5) with a helical expansion (15 ) comprises the steps of: superimposing a shaped strip (2) onto the inner supporting pipe (1). Said strip (2) is fixed to the supporting pipe (1), whereupon the pipe is stretched along the axis thereof. Then the power frame formed by the strip (2) is covered with the interlayer (5) from an elastic material and fixed to the strip (2). Thereafter, the reinforcing layers (6) and (7) are wound, the protective shell is superimposed thereon, and the supporting pipe (1) is released from the action of the axial tensile load.

Inventors

  • 👤 Gasan M. B. O. Abdullaev
  • 👤 Faramaz G. O. Maxudov
  • 👤 Dzhangir A. K. O. Kasimov
  • 👤 Bakhtiyar M. R. O. Mamedov
  • 👤 Gabil G. Aliev
  • 👤 Yashar A. O. Gadzhiev
  • 👤 Rovshan I. O. Shakhmamedov
  • 👤 Alexei A. Iljushin

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 15:51
CPC Classifications
F; F16; F16L; F16L11/00; F16L11/14; F16L11/16; F16L11/04; F16L11/08; F16L11/081; F16L11/083

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 214 words
In a flexible pipe comprising an inner supporting pipe made from an elastic material; a power frame formed by a shaped strip having a Z-shaped cross-sectional profile with two stepwise conjugated flanges, the strip being wound in a spiral fashion onto the supporting pipe such that the upper flange of each turn is disposed over the lower flange of the adjacent turn, an interlayer formed of an elastic material and superimposed onto the power frame, at least one pair of reinforcing layers including an upper and a lower reinforcing layer, said reinforcing layers being formed by groups of power filaments, said filaments being parallel to one another and wound in opposed directions onto said interlayer, and an external protective shell formed of an elastic material, the improvement comprising, each of said flanges is of a quadrangular cross-section and is of a height equal to one half of the height of the profile of the strip so that the upper flange of each turn rests directly on the lower flange of the adjacent turn, and the ends of the upper flanges as well as the ends of the lower flanges are aligned, the power filaments of each reinforcing layer being wound at angles of from about 0° to 20° to the axis of the pipe.
Claim 2
Dependent Claim 214 words
In a flexible pipe comprising an inner supporting pipe made from an elastic material; a power frame formed by a shaped strip having a Z-shaped cross-sectional profile with two stepwise conjugated flanges, the strip being wound in a spiral fashion onto the supporting pipe such that the upper flange of each turn is disposed over the lower flange of the adjacent turn, an interlayer formed of an elastic material and superimposed onto the power frame, at least one pair of reinforcing layers including an upper and a lower reinforcing layer, said reinforcing layers being formed by groups of power filaments, said filaments being parallel to one another and wound in opposed directions onto said interlayer, and an external protective shell formed of an elastic material, the improvement comprising, each of said flanges is of a quadrangular cross-section and is of a height equal to one half of the height of the profile of the strip so that the upper flange of each turn rests directly on the lower flange of the adjacent turn, and the ends of the upper flanges as well as the ends of the lower flanges are aligned, the power filaments of each reinforcing layer being wound at angles of from about 0° to 20° to the axis of the pipe.
Claim 3
Dependent Claim 33 words
A flexible pipe as claimed in claim 1, wherein said interlayer has a helical expansion disposed above a gap formed between the ends of the upper flanges of the turns of the strip.
Claim 4
Dependent Claim 46 words
A flexible pipe as claimed in claim 1, wherein between the power frame and the lower reinforcing layer of the power filaments wound at an angle of 0° to 20°, there is provided at least one layer of a shaped strip wound in the opposite direction.
Claim 5
Dependent Claim 55 words
A flexible pipe as claimed in claim 1, wherein between said interlayer and the pair of reinforcing layers of the power filaments wound at an angle of 0° to 20°, there is provided a layer formed by power filaments wound at an angle of about 30° to 60° to the axis of the flexible pipe.
Claim 6
Dependent Claim 35 words
A flexible pipe as claimed in claim 4, wherein said layer formed by the power filaments wound at an angle of 30° to 60° is closed by an additional interlayer formed of an elastic material.
Claim 7
Dependent Claim 44 words
A flexible pipe as claimed in claim 4 wherein on the ends of the flanges of the shaped strip, there are provided longitudinal projections and grooves being congruent thereto, into which grooves said projections enter when the turns of the strip are brought together.
Claim 8
Dependent Claim 24 words
A flexible pipe as claimed in claim 6, wherein the flanges forming the cross-sectional profile of the shaped strip have the form of parallelograms.
Claim 9
Dependent Claim 27 words
A flexible pipe as claimed in claim 7, wherein the ends of the flanges having a form of parallelograms, are rounded and have similar radii of curvature.

References Cited (Backward Citations)

US2742931A Cited
US1068553A Cited
US1692529A Cited
FR2142764A1 Cited
US4019539A Cited
SU668625A3 Cited
FR2229538B1 Cited
NL7901298A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-09-12 1987-03-14 1987-09-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-09-12 1991-03-14 1991-09-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-09-12 1995-03-14 1995-09-13 $7700.00 Window Closed / Lapsed

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