US3753415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrofoil-shaped stabilizing or attitude-affecting means for boats
Assignee: Individual
•
Filing: 1971-11-30
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Granted: 1973-08-21
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Expires: 1991-11-30
Abstract
Abstract A hydrofoil-shaped stabilizer or attitude-changing means for boats, having an elongated frame assembly adapted to be connected to a submerged portion of the hull of a boat with its longitudinal axis parallel to the fore-to-aft axis of the boat. A flexible curtain assembly extends about the frame assembly and is fixed thereto but free to move laterally and to a more limited extent longitudinally relative to the frame assembly. The interior of the curtain assembly communicates with the surrounding water and is deflected to one side or the other relative to the frame assembly by its displacement relative to the water caused by a change in the attitude of the boat so as to form a hydrofoil having a camber for generating forces to oppose the change in attitude to one side or the other when the boat is underway.
Inventors
- 👤 S Burtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
B; B63; B63B; B63B41/00; B63B39/00; B63B39/06; B63B35/00; B63B2035/009; B63B2039/063
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
300 words
A hydrofoil-shaped attitude-affecting means for a boat, comprising elongated mounting means, means for connecting said mounting means to the hull of a boat with the longitudinal axis of said mounting means extending substantially parallel to the fore-to-aft axis of said boat, a longitudinally extending frame assembly connected to and depending from said mounting means so as to be normally submerged in use, flexible curtain means substantially enclosing both sides of said frame assembly, means supporting said flexible curtain means so that the later is free for limited lateral displacement to either side relative to said frame assembly between two extreme positions in response to and depending upon the direction of the displacement of said frame assembly and flexible curtain means relative to the water surrounding the same, the interior of said flexible curtain means being free to communicate with the water surrounding the same when the latter is submerged, said flexible curtain means in said one of its extreme positions has one side thereof engaging one side of said frame assembly and the other side thereof spaced from the other side of said frame assembly, said flexible curtain means in said other of its extreme positions has its other side engaging the other side of said frame assemblY and said one side of said flexible curtain means is spaced from said one side of said curtain assembly, and said flexible curtain means in cooperation with said frame assembly in one of its said extreme positions having a camber for generating forces in one direction normal to the longitudinal axis thereof and in the other of its said extreme positions having a camber for generating forces in the direction opposite to said one direction, whereby said attitude-affecting means functions on a boat underway ahead to inhibit changes in the attitude thereof.
Claim 2
Dependent Claim
300 words
A hydrofoil-shaped attitude-affecting means for a boat, comprising elongated mounting means, means for connecting said mounting means to the hull of a boat with the longitudinal axis of said mounting means extending substantially parallel to the fore-to-aft axis of said boat, a longitudinally extending frame assembly connected to and depending from said mounting means so as to be normally submerged in use, flexible curtain means substantially enclosing both sides of said frame assembly, means supporting said flexible curtain means so that the later is free for limited lateral displacement to either side relative to said frame assembly between two extreme positions in response to and depending upon the direction of the displacement of said frame assembly and flexible curtain means relative to the water surrounding the same, the interior of said flexible curtain means being free to communicate with the water surrounding the same when the latter is submerged, said flexible curtain means in said one of its extreme positions has one side thereof engaging one side of said frame assembly and the other side thereof spaced from the other side of said frame assembly, said flexible curtain means in said other of its extreme positions has its other side engaging the other side of said frame assemblY and said one side of said flexible curtain means is spaced from said one side of said curtain assembly, and said flexible curtain means in cooperation with said frame assembly in one of its said extreme positions having a camber for generating forces in one direction normal to the longitudinal axis thereof and in the other of its said extreme positions having a camber for generating forces in the direction opposite to said one direction, whereby said attitude-affecting means functions on a boat underway ahead to inhibit changes in the attitude thereof.
Claim 3
Dependent Claim
297 words
A hydrofoil-shaped boat stabilizer, comprising elongated mounting means, means for connecting said mounting means to the normally submerged portion of the hull of a boat with the longitudinal axis of said mounting means extending substantially parallel to the fore-to-aft axis of said boat, a longitudinally extending frame assembly connected to and depending from said mounting means, flexible curtain means substantially enclosing both sides of said frame assembly, means supporting said flexible curtain means so that the later is free for limited lateral displacement to either side relative to said frame assembly between two extreme positions in response to and depending upon the direction of the displacement of (a) said frame assembly and flexible curtain means relative to (b) the water surrounding the same, the interior of said flexible curtain means being free to communicate with the water surrounding the stabilizer when the latter is submerged, said flexible curtain means in said one of its extreme positions has one side thereof engaging one side of said frame assembly and the other side thereof spaced from the other side of said frame assembly, said flexible curtain means in said other of its extreme positions has its other side engaging the other side of said frame assembly and said one side of said flexible curtain means is spaced from said one side of said curtain assembly, and said flexible curtain means in cooperation with said frame assembly in one of its said extreme positions having a camber for generating forces in one direction normal to the longitudinal axis thereof and in the other of its said extreme positions having a camber for generating forces in the direction opposite to said one direction, whereby said stabilizer functions on a boat underway ahead to inhibit rolling thereof and thereby stabilize the same.
Claim 4
Dependent Claim
297 words
A hydrofoil-shaped boat stabilizer, comprising elongated mounting means, means for connecting said mounting means to the normally submerged portion of the hull of a boat with the longitudinal axis of said mounting means extending substantially parallel to the fore-to-aft axis of said boat, a longitudinally extending frame assembly connected to and depending from said mounting means, flexible curtain means substantially enclosing both sides of said frame assembly, means supporting said flexible curtain means so that the later is free for limited lateral displacement to either side relative to said frame assembly between two extreme positions in response to and depending upon the direction of the displacement of (a) said frame assembly and flexible curtain means relative to (b) the water surrounding the same, the interior of said flexible curtain means being free to communicate with the water surrounding the stabilizer when the latter is submerged, said flexible curtain means in said one of its extreme positions has one side thereof engaging one side of said frame assembly and the other side thereof spaced from the other side of said frame assembly, said flexible curtain means in said other of its extreme positions has its other side engaging the other side of said frame assembly and said one side of said flexible curtain means is spaced from said one side of said curtain assembly, and said flexible curtain means in cooperation with said frame assembly in one of its said extreme positions having a camber for generating forces in one direction normal to the longitudinal axis thereof and in the other of its said extreme positions having a camber for generating forces in the direction opposite to said one direction, whereby said stabilizer functions on a boat underway ahead to inhibit rolling thereof and thereby stabilize the same.
Claim 5
Dependent Claim
43 words
A stabilizer as set forth in claim 2 wherein means are provided for inhibiting the movement of water from along one side of said curtain means into the interior thereof while said curtain means is in each of its said two extreme positions.
Claim 6
Dependent Claim
55 words
A stabilizer as set forth in claim 3 wherein said means for inhibiting the movement of water comprises a pair of auxiliary plates for engaging the upper and lower peripheral portions of said curtain means along one side of said curtain means depending upon which of said extreme positions is occupied by said curtain means.
Claim 7
Dependent Claim
38 words
A stabilizer as set forth in claim 2 wherein said curtain means comprises two water-impervious courses one extending along each side of said frame assembly, and a plurality of cross-members extending between and pivotally connected to said courses.
Claim 8
Dependent Claim
28 words
A stabilizer as set forth in claim 5 wherein said curtain means is fixed to said frame assembly substantially only along the forwardly presented vertical center line thereof.
Claim 9
Dependent Claim
38 words
A stabilizer as set forth in claim 5 wherein said frame assembly comprises a plurality of spaced frame members depending from said mounting means and aligned along said longitudinal axis, and said cross-members extend between said frame members.
Claim 10
Dependent Claim
59 words
A stabilizer as set forth in claim 7 wherein said curtain means is fixed to the forward one of said frame members substantially along the vertical center line thereof, and the rearward end portion of said curtain means is movably connected to the rearmost one of said frame members and is free for limited longitudinal movement with respect Thereto.
References Cited (Backward Citations)
US3118639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |