US3802800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch propeller with emergency control
Assignee: Lips NV
•
Filing: 1972-08-23
•
Granted: 1974-04-09
•
Expires: 1992-08-23
Abstract
Abstract A variable-pitch propeller has a pair of fixed pistons in the hub thereof, and a cylinder hydraulically movable on these fixed pistons and connected to the blades to vary the pitch of the blades. One of the fixed pistons is hollow and contains an auxiliary piston movable under the influence of a separate hydraulic system into engagement with the cylinder so that if the first hydraulic system fails, the auxiliary system can at least get the ship to port. The auxiliary hydraulic system can include a separate passage through the propeller shaft, or a branch from the lubricant passage through the propeller shaft.
Inventors
- 👤 A Merkx
- 👤 Spijk H Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:08
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/06; B63H3/08; B63H3/081; B63H3/082; B63H2003/088
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A variable-pitch propeller comprising a hub, a plurality of blades carried by the hub, at least one piston in the hub fixed relative to the hub, a hydraulic cylinder in the hub movable on said at least one piston relative to the hub, means for supplying medium to the cylinder to move the cylinder on said at least one piston relative to the hub, means interconnecting the cylinder and the blades to change the pitch of the blades upon movement of the cylinder relative to the hub, a said piston being hollow, an auxiliary piston in said hub movable coaxially within and relative to said hollow piston, and means independent of the first-mentioned medium-supplying means for supplying medium to said auxiliary piston to move said auxiliary piston into contact with said cylinder.
Claim 2
Dependent Claim
132 words
A variable-pitch propeller comprising a hub, a plurality of blades carried by the hub, at least one piston in the hub fixed relative to the hub, a hydraulic cylinder in the hub movable on said at least one piston relative to the hub, means for supplying medium to the cylinder to move the cylinder on said at least one piston relative to the hub, means interconnecting the cylinder and the blades to change the pitch of the blades upon movement of the cylinder relative to the hub, a said piston being hollow, an auxiliary piston in said hub movable coaxially within and relative to said hollow piston, and means independent of the first-mentioned medium-supplying means for supplying medium to said auxiliary piston to move said auxiliary piston into contact with said cylinder.
Claim 3
Dependent Claim
73 words
A variable-pitch propeller as claimed in claim 1, and a propeller shaft to which the hub is secured, said propeller shaft having a passageway therethrough for supplying and discharging lubrication oil from a supply tank to and from said interconnecting means, said passageway comprising said independent medium-supplying means, a manually operated valve adjacent the end of said passageway remote from the hub, and an automatically operated valve in said passageway adjacent the hub.
Claim 4
Dependent Claim
44 words
A variable-pitch propeller as claimed in claim 1, and a propeller shaft to which the hub is secured, said independent medium-supplying means comprising a separate passageway through said shaft with a supply opening in the outer wall of said shaft remote from said hub.
Claim 5
Dependent Claim
20 words
A variable-pitch propeller as claimed in claim 3, and a separate medium-supply sleeve about the shaft and said supply opening.
References Cited (Backward Citations)
US2693243A
Cited
US3034584A
Cited
US3501251A
Cited
DE1810492A1
Cited
US3640644A
Cited
DE2000203A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-08 | 1977-10-08 | 1978-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-08 | 1981-10-08 | 1982-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-08 | 1985-10-08 | 1986-04-09 | $7700.00 | Window Closed / Lapsed |