Patent US3557743A successfully refreshed from Google Patents.
US3557743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ship{3 s propulsion control system
Assignee: United States Department of the Navy
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Filing: 1968-11-27
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Granted: 1971-01-26
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Expires: 1988-11-27
Abstract
Abstract An automatic dynamic water braking reversal system for a ship''s propulsion plant comprising a water brake on the shaft connecting the prime mover and the reduction gears, enabling rapid speed reduction of the propeller shaft thereby reducing the amount of energy required to be absorbed by the clutches used with an unidirectional prime mover and a reversible drive shaft. Additionally, the water brake may be used to load the engine to obtain lower idle speed operation.
Inventors
- 👤 Casimir J Rubis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:31
CPC Classifications
B; B63; B63H; B63H23/00; B63H23/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
An automatic dynamic brake and reversal system for a ship''s propulsion unit utilizing a unidirectional prime mover connected by a main propulsion shaft to reversible reduction gears, said gears being connected to a propeller shaft comprising: a continuously operating water brake attached to the main propulsion shaft between the prime mover and the reduction gears; a forward clutch for engaging the reduction gears to the propeller shaft to produce reverse thrust on the ship; a throttle control system for sequentially controlling the throttle of the prime mover, the flow of water to and from said water brake and for engaging and disengaging said clutches, whereby said water brake provides a continuously controlled leading force on said prime mover thereby enabling said propeller shaft to be operated over a range of speeds including a lower idle speed.
Claim 2
Dependent Claim
136 words
An automatic dynamic brake and reversal system for a ship''s propulsion unit utilizing a unidirectional prime mover connected by a main propulsion shaft to reversible reduction gears, said gears being connected to a propeller shaft comprising: a continuously operating water brake attached to the main propulsion shaft between the prime mover and the reduction gears; a forward clutch for engaging the reduction gears to the propeller shaft to produce reverse thrust on the ship; a throttle control system for sequentially controlling the throttle of the prime mover, the flow of water to and from said water brake and for engaging and disengaging said clutches, whereby said water brake provides a continuously controlled leading force on said prime mover thereby enabling said propeller shaft to be operated over a range of speeds including a lower idle speed.
Claim 3
Dependent Claim
21 words
The system of claim 1, wherein the flow of water to and from said water brake is regulated by solenoid valves.
Claim 4
Dependent Claim
57 words
The system of claim 2, including means in said throttle control system for transmitting electrical signals to said solenoid valves, said throttle, and said clutches, whereby sequential control of said valves, throttle and clutches may be enabled. a reverse clutch for engaging the reduction gears to the propeller shaft to produce reverse thrust on the ship; and
References Cited (Backward Citations)
US2741351A
Cited
GB837776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |