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US3785587A Expired / Lapsed US ⏱️ 0.0 years remaining

Coil of continuous elongated material

Assignee: Republic Steel Corp
•
Filing: 1971-06-24
•
Granted: 1974-01-15
•
Expires: 1991-06-24
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Abstract

Abstract A coil made of a continuous piece of elongated material such as tubing, prebent into pancake-like spirals called radial layers, each radial layer made up of several concentric and coplanar convolutions, with several radial layers stacked axially, and method and apparatus for making such coils. The material is bent prior to coiling at predetermined bending radii which are different for different convolutions within a radial layer. One or more of the convolutions within each radial layer may be bent at constant bending radius; the rest may be bent at gradually changing radii. The bending radius is controlled by an electric and hydraulic network employing both timed and feedback controls. The coil may be built either upwardly, with the most recently made radial layer always at the bottom of the coil, or it can be built downwardly, with the most recently made radial layer always on the top of the coil.

Inventors

  • 👤 H Meyfarth
  • 👤 J Crosby

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 00:07
CPC Classifications
B; B21; B21C; B21C47/00; B21C47/02; B21C47/08; B65; B65H; B65H49/00; B65H49/18; B65H54/00; B65H54/76

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 109 words
A coil of continuous elongated material comprising a plurality of axially stacked radial layers, each radial layer comprising a plurality of coplanar convolutions, each convolution within each radial layer being continuous with each immediately adjacent convolution of that radial layer, each convolution being prebent prior to coiling, wherein the length of material making up at least one of the outermost and innermost convolutions in each of a plurality of layers is prebent to a constant radius of curvature, and wherein the length of material making up at least one of the convolutions in that layer between the outermost and innermost convolutions is prebent to a non-constant radius of curvature.
Claim 2
Dependent Claim 109 words
A coil of continuous elongated material comprising a plurality of axially stacked radial layers, each radial layer comprising a plurality of coplanar convolutions, each convolution within each radial layer being continuous with each immediately adjacent convolution of that radial layer, each convolution being prebent prior to coiling, wherein the length of material making up at least one of the outermost and innermost convolutions in each of a plurality of layers is prebent to a constant radius of curvature, and wherein the length of material making up at least one of the convolutions in that layer between the outermost and innermost convolutions is prebent to a non-constant radius of curvature.
Claim 3
Dependent Claim 34 words
A coil as defined in claim 1 wherein, within a radial layer, the length of material making up only one of the innermost and outermost convolutions is prebent to a constant radius of curvature.
Claim 4
Dependent Claim 33 words
A coil as defined in claim 1 wherein, within a radial layer, the lengths of material making up the innermost and the outermost convolutions are prebent to different but constant radii of curvature.
Claim 5
Dependent Claim 49 words
A coil as defined in claim 1 wherein, in each pair of axially adjacent radial layers, the two convolutions that are continuous with each other are prebent such that one is prebent to a constant radius of curvature while the other is prebent to a non-constant radius of curvature.
Claim 6
Dependent Claim 44 words
A coil as defined in claim 1 wherein one of the outermost and innermost convolutions of each radial layer, except the end layers, is substantially nested inside the adjacent outermost or innermost convolutions, as the case may be, of the two adjacent radial layers.

References Cited (Backward Citations)

US918235A Cited
US1992430A Cited
US3145760A Cited
US3236467A Cited
US3337154A Cited
US3445077A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-01-14 1977-07-16 1978-01-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-01-14 1981-07-16 1982-01-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-01-14 1985-07-16 1986-01-15 $7700.00 Window Closed / Lapsed

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