Patent US3952680A successfully refreshed from Google Patents.
US3952680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll stabilizer for vessels at rest
Assignee: Individual
•
Filing: 1974-09-30
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Granted: 1976-04-27
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Expires: 1994-09-30
Abstract
Abstract A stabilizer for reducing the amount of roll motion induced by ocean swells in a vessel drifting or at anchor. A stabilizer arm is pivotally mounted about a horizontal axis on the deck of the vessel and supports a stabilizer disc at its outer end. The disc has sufficient buoyancy so that it is self positioning at the surface of the water, but at the same time is sufficiently submerged to be fully effective. The disc constantly adjusts its relative angular position to the vessel through the pivotal interconnection. As the vessel is exposed to the force of a swell that would tend to cause the vessel to roll, the disc is pushed or pulled through the water. The drag force on the disc is in opposition to the force tending to cause the vessel to roll.
Inventors
- 👤 Edward N. Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:08
CPC Classifications
B; B63; B63B; B63B39/00; B63B39/06; B63B39/062; B63B2039/067
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
119 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water comprising: a stabilizer disc means comprising a generally planer disc having a net buoyancy for floating said planer disc on a water surface and maintaining a major portion of said planar disc submerged, pivot means secured to the vessel at a point spaced above the nominal water line of said vessel, stabilizer arm means connected between said stabilizer disc and said pivot means for pivotal movement of said stabilizer disc about a generally horizontal axis in response to the passage of a swell, one of said stabilizer disc means being secured on each of the two opposite sides of the vessel.
Claim 2
Dependent Claim
119 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water comprising: a stabilizer disc means comprising a generally planer disc having a net buoyancy for floating said planer disc on a water surface and maintaining a major portion of said planar disc submerged, pivot means secured to the vessel at a point spaced above the nominal water line of said vessel, stabilizer arm means connected between said stabilizer disc and said pivot means for pivotal movement of said stabilizer disc about a generally horizontal axis in response to the passage of a swell, one of said stabilizer disc means being secured on each of the two opposite sides of the vessel.
Claim 3
Dependent Claim
47 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 1 wherein; the distance between said pivot axis and said disc means is substantially twice the distance of the pivot means above said nominal water line.
Claim 4
Dependent Claim
36 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 1 wherein; said disc is secured at substantially a right angle to said stabilizer arm.
Claim 5
Dependent Claim
35 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 1 wherein; said stabilizer disc is substantially at the amidships point of said vessel.
Claim 6
Dependent Claim
37 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 4, further including: a line extending from said disc means to the bow of said vessel.
Claim 7
Dependent Claim
32 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 1, wherein; said planar disc is substantially circular in planar configuration.
Claim 8
Dependent Claim
130 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water comprising: a stabilizer disc means comprising first and second planar discs having a net buoyancy for floating said planar discs on a water surface and maintaining a major portion of said planar discs submerged, pivot means secured to the vessel at a point spaced above the nominal water line of the vessel, stabilizer arm means connected between said stabilizer disc means and said pivot means for pivotal movement of said stabilizer disc means about a generally horizontal axis in response to the passage of a swell, said second planar disc is supported spaced from said first planar disc forming a volume between said discs that is open for the admission of water.
Claim 9
Dependent Claim
130 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water comprising: a stabilizer disc means comprising first and second planar discs having a net buoyancy for floating said planar discs on a water surface and maintaining a major portion of said planar discs submerged, pivot means secured to the vessel at a point spaced above the nominal water line of the vessel, stabilizer arm means connected between said stabilizer disc means and said pivot means for pivotal movement of said stabilizer disc means about a generally horizontal axis in response to the passage of a swell, said second planar disc is supported spaced from said first planar disc forming a volume between said discs that is open for the admission of water.
Claim 10
Dependent Claim
48 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 7 wherein: the distance between said pivot means and said disc means is substantially twice the distance that said pivot means is above said nominal water line.
Claim 11
Dependent Claim
37 words
A roll stabilizer for reducing the swell inducing rolling motion of a vessel in a body of water according to claim 7 wherein: said disc means is secured at substantially a right angle to said stabilizer arm.
Claim 12
Dependent Claim
33 words
A roll stabilizer for reducing the swell inducing rolling motion in a body of water according to claim 7 wherein: said stabilizer disc means is substantially at the midships point of said vessel.
Claim 13
Dependent Claim
37 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 10 further including: the line extending from said disc means into the bow of said vessel.
Claim 14
Dependent Claim
35 words
A roll stabilizer for reducing the swell induced rolling motion of a vessel in a body of water according to claim 7 wherein: said first and second planar discs are substantially circular in planar configuration.
Claim 15
Dependent Claim
48 words
A roll stabilizer for reducing the roll induced rolling motion of a vessel in a body of water according to claim 7 wherein: said second planar disc is supported by a plurality of longitudinal spacers extending generally parallel to the fore and aft center line of the vessel.
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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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |