Patent CH100631A successfully refreshed from Google Patents.
US4058076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hull foils with hydrodynamic righting forces
Assignee: Individual
•
Filing: 1976-09-02
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Granted: 1977-11-15
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Expires: 1996-09-02
Abstract
Abstract A boat is provided having front and rear ends, a bottom and upwardly projecting sides extending upwardly to an elevation spaced above the static water line of the boat. A depending central strut (fixed or upwardly retractable) projects downwardly from the bottom and a pair of elongated downwardly convergent opposite side flexible foils including leading and trailing longitudinal edges facing in front and rear directions, respectively, of the boat are provided and have their lower ends anchored to the lower end portion of the strut. The upper end portions of the foils are anchored relative to upper portions of the corresponding sides of the boat above the static water line thereof outwardly of the boat sides and the foils are free of support from the boat intermediate the upper and lower ends of the foils.
Inventors
- 👤 Philip J. Danahy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:38
CPC Classifications
B; B63; B63B; B63B1/00; B63B1/16; B63B1/24; B63B1/28; B63B1/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
154 words
In combination with a boat having front and rear ends, a bottom and upwardly projecting sides extending upwardly to an elevation spaced above the static water line of said boat, a depending central strut projecting downwardly from said bottom, a pair of elongated, longitudinally straight and downwardly convergent opposite side flexible foils including leading and trailing longitudinal edges facing in front and rear directions, respectively, of said boat, first anchor means anchoring the lower ends of said foils to the lower end portion of said strut, and second anchor means anchoring the upper end portions of said foils to upper portions of the corresponding sides of said boat above said static waterline, said foils extending lengthwise along generally straight paths and being free of support from said boat and each other intermediate said first and second anchor means and thereby being free to twist and bow, slightly, between said first and second anchor means.
Claim 2
Dependent Claim
154 words
In combination with a boat having front and rear ends, a bottom and upwardly projecting sides extending upwardly to an elevation spaced above the static water line of said boat, a depending central strut projecting downwardly from said bottom, a pair of elongated, longitudinally straight and downwardly convergent opposite side flexible foils including leading and trailing longitudinal edges facing in front and rear directions, respectively, of said boat, first anchor means anchoring the lower ends of said foils to the lower end portion of said strut, and second anchor means anchoring the upper end portions of said foils to upper portions of the corresponding sides of said boat above said static waterline, said foils extending lengthwise along generally straight paths and being free of support from said boat and each other intermediate said first and second anchor means and thereby being free to twist and bow, slightly, between said first and second anchor means.
Claim 3
Dependent Claim
28 words
The combination of claim 1 wherein said second anchor means includes adjustment means operative to adjustably angularly displace said upper end portion of said foils about upstanding axes.
Claim 4
Dependent Claim
27 words
The combination of claim 2 wherein said adjustment means includes means operative to simultaneously equally and oppositely angularly displace said upper end portions about said upstanding axes.
Claim 5
Dependent Claim
100 words
The combination of claim 1 including means supporting a said strut from said boat for upward retraction relative thereto with the lower end portion of said strut adjacent the bottom of said boat, said foils being stiff but bendable, said second anchor means including means operative to upwardly retract said upper end portions theretoward and said foils being bendable to conform to at least the transverse lower portions of the outline of said boat on opposite sides of said strut for overlying at least those portions of the outer surfaces of said hull opposing the lower portions of said foils.
Claim 6
Dependent Claim
22 words
The combination of claim 1 wherein said boat includes front and rear pairs of opposite side foils spaced longitudinally of said boat.
Claim 7
Dependent Claim
29 words
The combination of claim 5 wherein said boat includes a center pair of opposite side foils spaced longitudinally of said boat between said front and rear pairs of foils.
Claim 8
Dependent Claim
20 words
The combination of claim 1 wherein each of said foils comprises a pair of spaced leading and trailing foil elements.
Claim 9
Dependent Claim
20 words
The combination of claim 1 wherein the leading and trailing edges of each of said foils generally parallel each other.
Claim 10
Dependent Claim
25 words
The combination of claim 1 wherein the leading and trailing edges of each of said foils are convergent toward one pair of corresponding ends thereof.
Claim 11
Dependent Claim
17 words
The combination of claim 1 wherein the leading and trailing edges of each foil are downwardly convergent.
Claim 12
Dependent Claim
10 words
The combination of claim 1 wherein said strut is fixed.
Claim 13
Dependent Claim
23 words
The combination of claim 1 wherein each of said foils comprises a single strip member including generally parallel and planar opposite sides faces.
Claim 14
Dependent Claim
21 words
The combination of claim 1 wherein each of said foils comprises a single strip member having an airfoil cross sectional shape.
Claim 15
Dependent Claim
26 words
The combination of claim 1 wherein each of said foils includes a plurality of strip members enclosed within a body having an airfoil cross sectional shape.
Claim 16
Dependent Claim
37 words
The combination of claim 1 wherein each of said foils includes a main body portion having an airfoil cross sectional shape and including elongated tension members embedded therein extending along the leading and trailing edge portions thereof.
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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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |