US4053081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced filament-wound cut-port pressure vessel and method of making same
Assignee: United States Department of the Navy
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Filing: 1976-08-20
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Granted: 1977-10-11
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Expires: 1996-08-20
Abstract
Abstract The fabricated pressure vessel is a filament wound structure having a connt winding angle assuring maximum filament utilization efficiency and also having polar end openings of different sizes. Fabrication of the vessel includes a first step of forming a structure having filament windings and identically-sized polar openings equal to or less than the smaller of the openings dictated by the design. Identical openings permit the constant winding angle. In the winding operation, wafer-like mats formed of dimensionally-stable material are interspersed between the filament layers at each polar end. In the final step, the polar openings then are machined to the desired size. The interspersed mats encircle the polar openings and reinforce the polar regions.
Inventors
- 👤 Charles M. Minke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:45
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C53/602; B29C53/605; B01; B01J; B01J3/00; B01J3/04; B01J3/048; B65; B65H; B65H54/00; B65H54/64; F; F17; F17C; F17C2209/00; F17C2209/21; F17C2209/2154
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
A method of making a filament wound pressure vessel having a desired constant helical winding angle and having finally sized polar end openings one of which is larger than the other, comprising: windably forming an initial pressure vessel structure having a symetrical curvative formed by an elongate cylindrical body portion and ovaloid end portions having identically-sized polar end openings of a diameter no greater than the smaller of said finally sized openings, said vessel being formed by winding the filament of each layer at a constant helical angle across the length of said body portion and said end portions and said helical angle being one that constantly maintains a winding path that follows a geodesic line of the symetrically-arcuate surfaces being formed, reinforcing said polar ends of said initial vessel by interspersing a wafer-like mat between each of said filament layers, and matching at least one of said initial polar ends to enlarge its opening to the desired final size, said mats reinforceably encircling the edge portions of said finally-sized openings and being formed of material that is dimensionally stable under pressure vessel operating conditions.
Claim 2
Independent Claim
185 words
A method of making a filament wound pressure vessel having a desired constant helical winding angle and having finally sized polar end openings one of which is larger than the other, comprising: windably forming an initial pressure vessel structure having a symetrical curvative formed by an elongate cylindrical body portion and ovaloid end portions having identically-sized polar end openings of a diameter no greater than the smaller of said finally sized openings, said vessel being formed by winding the filament of each layer at a constant helical angle across the length of said body portion and said end portions and said helical angle being one that constantly maintains a winding path that follows a geodesic line of the symetrically-arcuate surfaces being formed, reinforcing said polar ends of said initial vessel by interspersing a wafer-like mat between each of said filament layers, and matching at least one of said initial polar ends to enlarge its opening to the desired final size, said mats reinforceably encircling the edge portions of said finally-sized openings and being formed of material that is dimensionally stable under pressure vessel operating conditions.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein said mat material has a modulus of elasticity of 20 × 10 6 psi.
Claim 4
Independent Claim
169 words
A method of making a plurality of filament-wound pressure vessels each having an identical constant helical winding angle and polar end openings of varying sizes, comprising: windably forming a plurality of initial pressure vessel structures each having a symetrical curvature formed by an elongate cylindrical body portion and ovaloid end portions having identically-sized polar end openings no greater than the smallest of said varying sizes, said vessels each being formed by winding the filament of each layer at a constant helical angle across the length of its body portion and its end portions and said helical angle being one that constantly maintains a winding path that follows a geodesic line of the symetrically-arcuate surfaces being formed, reinforcing said polar ends of said initial vessels by interspersing a wafer-like mat between each filament layer, and machining said initial openings to said varying sizes, said mats reinforcably encircling the edge portions of said varying sized openings and being formed of a material that is dimensionally stable under pressure vessel operating conditions.
Claim 5
Independent Claim
169 words
A method of making a plurality of filament-wound pressure vessels each having an identical constant helical winding angle and polar end openings of varying sizes, comprising: windably forming a plurality of initial pressure vessel structures each having a symetrical curvature formed by an elongate cylindrical body portion and ovaloid end portions having identically-sized polar end openings no greater than the smallest of said varying sizes, said vessels each being formed by winding the filament of each layer at a constant helical angle across the length of its body portion and its end portions and said helical angle being one that constantly maintains a winding path that follows a geodesic line of the symetrically-arcuate surfaces being formed, reinforcing said polar ends of said initial vessels by interspersing a wafer-like mat between each filament layer, and machining said initial openings to said varying sizes, said mats reinforcably encircling the edge portions of said varying sized openings and being formed of a material that is dimensionally stable under pressure vessel operating conditions.
Claim 6
Dependent Claim
123 words
A filament-wound pressure vessel comprising: an elongate symmetrically-shaped vessel structure having a cylindrical body portion and a pair of symmetrically-ovaloid polar end portions each provided with a polar opening one of which is larger in diameter than the other, said vessel structure including: a plurality of filament layers each formed of a helical filament winding extending across said length and end portions of said vessel at a constant winding angle on a winding path that follows the geodesic line of said symmetrical length and end portions, and, a wafer-like mat disposed between each filament layer in closely encircling proximity to the edge portions of said polar openings, said mats being formed of a material that is dimensionally stable under pressure vessel operating conditions.
Claim 7
Dependent Claim
123 words
A filament-wound pressure vessel comprising: an elongate symmetrically-shaped vessel structure having a cylindrical body portion and a pair of symmetrically-ovaloid polar end portions each provided with a polar opening one of which is larger in diameter than the other, said vessel structure including: a plurality of filament layers each formed of a helical filament winding extending across said length and end portions of said vessel at a constant winding angle on a winding path that follows the geodesic line of said symmetrical length and end portions, and, a wafer-like mat disposed between each filament layer in closely encircling proximity to the edge portions of said polar openings, said mats being formed of a material that is dimensionally stable under pressure vessel operating conditions.
Claim 8
Dependent Claim
27 words
The pressure vessel of claim 4 wherein said vessel is rocket motor chamber and said material has a modulus of elasticity of 20 × 10 6 psi.
Claim 9
Dependent Claim
25 words
The pressure vessel of claim 5 wherein said mat is formed of helically-wound strips of graphite tape having graphite fibers running lengthwise of said strips.
Claim 10
Dependent Claim
28 words
The pressure vessel of claim 5 wherein said mat is formed of spiral-hoop carbon fiber windings faced with glass fiber tape oriented radially to said polar end openings.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |