US3581449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reducing karman vortex street effects on a structure
Assignee: Rohde and Schwarz GmbH and Co KG
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Filing: 1968-08-21
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Granted: 1971-06-01
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Expires: 1988-08-21
Abstract
Abstract Cylindrical structure for use as an outdoor television antenna or the like, on which are formed a plurality of axially spaced embossments for reducing the oscillatory movements of the structure which may be caused by the development of a Karman vortex street due to wind currents.
Inventors
- 👤 Franz R Huber
- 👤 Rudolf Frimberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:00
CPC Classifications
E; E04; E04H; E04H12/00; F; F15; F15D; F15D1/00; F15D1/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
In a cylindrical structure normally subject to aerodynamic effects such as the mast of a television antenna or the like having a slenderness ration sufficient to cause oscillatory movement when subjected to wind forces due to the development of a Karman Vortex Street around the structure, the improvement of means forming on the outer cylindrical wall of the structure a plurality of axially spaced embossments, said embossments each comprising an outer surface which is so configured to present an axial profile a substantial portion of which extends obliquely to said outer cylindrical wall of said structure, said embossments comprising annular rings which extend circumferentially continuously around the said outer cylindrical wall.
Claim 2
Dependent Claim
111 words
In a cylindrical structure normally subject to aerodynamic effects such as the mast of a television antenna or the like having a slenderness ration sufficient to cause oscillatory movement when subjected to wind forces due to the development of a Karman Vortex Street around the structure, the improvement of means forming on the outer cylindrical wall of the structure a plurality of axially spaced embossments, said embossments each comprising an outer surface which is so configured to present an axial profile a substantial portion of which extends obliquely to said outer cylindrical wall of said structure, said embossments comprising annular rings which extend circumferentially continuously around the said outer cylindrical wall.
Claim 3
Dependent Claim
33 words
The invention as defined in claim 1 wherein said embossments project radially outwardly of said outer cylindrical wall a distance at least equal to about one-fiftieth of the diameter of said cylindrical structure.
Claim 4
Dependent Claim
30 words
The invention as defined in claim 1 wherein each of said embossments extends axially a distance equal to at least about one twenty-fifth of the diameter of said cylindrical structure.
Claim 5
Dependent Claim
22 words
The invention as defined in claim 1 wherein at least a portion of the axial profiles of said embossments are arcuately shaped.
Claim 6
Dependent Claim
17 words
The invention as defined in claim 1 wherein the axial profiles of said embossments are semicircularly shaped.
Claim 7
Dependent Claim
17 words
The invention as defined in claim 1 wherein the axial profiles of said embossments are trapezoidally shaped.
Claim 8
Dependent Claim
17 words
The invention as defined in claim 1 wherein the axial profiles of said embossments are elliptically shaped.
Claim 9
Dependent Claim
17 words
The invention as defined in claim 1 wherein the axial profiles of said embossments are pyramidally shaped.
References Cited (Backward Citations)
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Cited
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US1013578A
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Cited
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |