Patent US3575526A successfully refreshed from Google Patents.
US3575526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ship{3 s propeller and method of changing the pitch thereof
Assignee: Lips NV
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Filing: 1969-04-08
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Granted: 1971-04-20
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Expires: 1989-04-08
Abstract
Abstract The forces necessary to change the pitch of a ship''s propeller of variable pitch are reduced by reducing the hydrodynamic torque during the pitch change. This is done by passing fluid comprising a gas or a liquid through the propeller blade and emitting it from the propeller blade on the suction side of the blade at a distance of 3 to 15 percent of the width of the suction side of the blade measured from the leading edge.
Inventors
- 👤 Leonard Anthonie Van Gunsteren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:33
CPC Classifications
B; B63; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/28; B63H3/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
67 words
A method for controlling the pitch of a bladed ship''s propeller, comprising changing the pitch of the propeller, and during the changing of the pitch of the propeller injecting a fluid through at least one side of the blades of the propeller from inside the blades into the water outside the blades at points more closely adjacent the leading edges than the trailing edges of the blades.
Claim 2
Independent Claim
67 words
A method for controlling the pitch of a bladed ship''s propeller, comprising changing the pitch of the propeller, and during the changing of the pitch of the propeller injecting a fluid through at least one side of the blades of the propeller from inside the blades into the water outside the blades at points more closely adjacent the leading edges than the trailing edges of the blades.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1, and conveying the fluid through the blades to the place of injection.
Claim 4
Dependent Claim
17 words
A method as claimed in claim 1, and injecting the fluid at the face of the blades.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 1, and injecting the fluid at the back of the blades.
Claim 6
Dependent Claim
17 words
A method as claimed in claim 1, and injecting the fluid from both sides of the blades.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 3, and injecting the fluid at a distance of 3 percent to 15 percent of the width of the blades measured from their leading edges.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1, and injecting the fluid through a multiplicity of openings through a surface of the blades.
Claim 9
Dependent Claim
11 words
A method as claimed in claim 1, said fluid being air.
Claim 10
Dependent Claim
57 words
In a variable pitch propeller for a ship, a propeller blade of variable pitch, and means for injecting fluid at at least one side of the blade from inside the blade into the surrounding water during changes in pitch of the blade, at points more closely adjacent the leading edge than the trailing edge of the blade.
Claim 11
Dependent Claim
57 words
In a variable pitch propeller for a ship, a propeller blade of variable pitch, and means for injecting fluid at at least one side of the blade from inside the blade into the surrounding water during changes in pitch of the blade, at points more closely adjacent the leading edge than the trailing edge of the blade.
Claim 12
Dependent Claim
27 words
A propeller as claimed in claim 9, the blade having a chamber recessed therein for the receptioN of said fluid, and a multiperforate plate closing the chamber.
Claim 13
Dependent Claim
22 words
A propeller as claimed in claim 10, the outer surface of the plate being flush with the adjacent surface of the blade.
Claim 14
Dependent Claim
34 words
A propeller as claimed in claim 9, said means for injecting fluid being disposed between 3 percent and 15 percent of the distance from the leading edge to the trailing edge of the blade.
Claim 15
Dependent Claim
20 words
A propeller as claimed in claim 12, said means for injecting fluid being disposed on the face of the blade.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |