US3955527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine propulsion trim tab with anti ventilation means
Assignee: Outboard Marine Corp
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Filing: 1974-07-08
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Granted: 1976-05-11
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Expires: 1994-07-08
Abstract
Abstract Disclosed herein is a marine propulsion device including a lower unit comprising a laterally extending anti-cavitation plate extending from the lower unit above a propeller and including a trailing portion, together with a trim tab extending downwardly from the trailing portion of the anti-cavitation plate aft of the propeller, and a deflector located aft of the propeller and extending from the trailing portion of the anti-cavitation plate and rearwardly of the trim tab for pressurizing the water forwardly thereof and below the anti-cavitation plate and in the region of the trim tab during forward movement of the lower unit through the water.
Inventors
- 👤 Theodore J. Holtermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:58
CPC Classifications
B; B63; B63B; B63B39/00; B63B39/06; B63B39/061; B63H; B63H20/00; B63H20/32; B63H20/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
A marine propulsion device including a propulsion unit comprising means adapted to be connected to a boat hull for mounting said propulsion unit from the boat hull for steering movement relative to the boat hull, and a lower unit including a gear box normally submerged in water, a propeller shaft rotatably mounted by said lower unit gear box and carrying a propeller, a laterally extending anti-cavitation plate extending above said propeller and including a trailing portion, a trim tab extending downwardly from said trailing portion of said anti-cavitation plate aft of said propeller, and deflector means fixedly located aft of said propeller and solely extending downwardly from said trailing portion of said anti-cavitation plate and rearwardly of said trim tab for pressurizing the water forwardly thereof and below said anti-cavitation plate and in the region of said trim tab during forward movement of said gear box through the water, said deflector means having a lowermost surface above said propeller shaft.
Claim 2
Dependent Claim
160 words
A marine propulsion device including a propulsion unit comprising means adapted to be connected to a boat hull for mounting said propulsion unit from the boat hull for steering movement relative to the boat hull, and a lower unit including a gear box normally submerged in water, a propeller shaft rotatably mounted by said lower unit gear box and carrying a propeller, a laterally extending anti-cavitation plate extending above said propeller and including a trailing portion, a trim tab extending downwardly from said trailing portion of said anti-cavitation plate aft of said propeller, and deflector means fixedly located aft of said propeller and solely extending downwardly from said trailing portion of said anti-cavitation plate and rearwardly of said trim tab for pressurizing the water forwardly thereof and below said anti-cavitation plate and in the region of said trim tab during forward movement of said gear box through the water, said deflector means having a lowermost surface above said propeller shaft.
Claim 3
Dependent Claim
20 words
A marine propulsion device in accordance with claim 1 wherein said deflector means includes a forward surface which is concave.
Claim 4
Dependent Claim
20 words
A marine propulsion device in accordance with claim 1 wherein said deflector means includes a forward surface which in convex.
Claim 5
Dependent Claim
24 words
A marine propulsion device in accordance with claim 1 wherein said deflector means includes a forwardly located surface extending downwardly from said anti-cavitation plate.
Claim 6
Dependent Claim
26 words
A marine propulsion device in accordance with claim 1 wherein said deflector means includes a forwardly located surface extending downwardly and rearwardly from said anti-cavitation plate.
Claim 7
Dependent Claim
34 words
A marine propulsion device in accordance with claim 1 wherein said trailing portion of said anti-cavitation plate includes a straight trailing edge which extends transversely of the direction of travel of said lower unit.
Claim 8
Dependent Claim
32 words
A marine propulsion device in accordance with claim 1 wherein said trailing portion of said anti-cavitation plate includes a pair of angularly related trailing edge portions extending from a rearwardly located junction.
Claim 9
Dependent Claim
25 words
A marine propulsion device in accordance with claim 1 wherein said trailing portion of said anti-cavitation plates includes a trailing edge which is rearwardly convex.
Claim 10
Dependent Claim
25 words
A marine propulsion device in accordance with claim 1 wherein said deflector means extends downwardly from said anti-cavitation plate forwardly of the trailing edge thereof.
Claim 11
Dependent Claim
32 words
A marine propulsion device in accordance with claim 1 wherein said deflector means has a width greater than said trim tab and extends laterally outwardly beyond the sides of said trim tab.
References Cited (Backward Citations)
US1716962A
Cited
US1980685A
Cited
US2256831A
Cited
US2998795A
Cited
US3516378A
Cited
US3537419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |