US3982494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auxiliary rudder for a jet propulsion unit
Assignee: Individual
•
Filing: 1975-03-24
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Granted: 1976-09-28
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Expires: 1995-03-24
Abstract
Abstract Auxiliary rudder apparatus for a water craft having a jet propulsion pump comprising an auxiliary rudder element coupled to the craft for movement between a raised inoperative position and a lowered operative position. A hydraulic cylinder operated by water pressure is coupled to the rudder element to move the same automatically to inoperative position when the craft is driven at sufficiently high speed that the water pressure of the pump is adequate to operate the hydraulic cylinder. The hydraulic cylinder is inoperative to move the rudder element to raised position both in forward and reverse travel of the craft below this high speed.
Inventors
- 👤 Jouko Juhani Posti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:37
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/10; B63H11/107; B63H11/11; B63H11/117; B63H25/00; B63H25/06; B63H25/38; B63H25/382
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
Auxiliary rudder apparatus for a water craft having a jet propulsion pump with a housing and a nozzle pivotably mounted on the housing for discharge of a propulsion jet, said apparatus comprising an auxiliary rudder element pivotably mounted on the nozzle for movement between a raised inoperative position and a lowered operative position, and a hydraulic cylinder coupled to the pump and the rudder element and operated by water pressure delivered by the pump to move the rudder automatically in inoperative position when the craft is driven at sufficiently high speed that the water pressure of the pump is adequate to operate the hydraulic cylinder.
Claim 2
Dependent Claim
105 words
Auxiliary rudder apparatus for a water craft having a jet propulsion pump with a housing and a nozzle pivotably mounted on the housing for discharge of a propulsion jet, said apparatus comprising an auxiliary rudder element pivotably mounted on the nozzle for movement between a raised inoperative position and a lowered operative position, and a hydraulic cylinder coupled to the pump and the rudder element and operated by water pressure delivered by the pump to move the rudder automatically in inoperative position when the craft is driven at sufficiently high speed that the water pressure of the pump is adequate to operate the hydraulic cylinder.
Claim 3
Dependent Claim
43 words
Auxiliary rudder apparatus as claimed in claim 1 wherein said hydraulic cylinder has a retracted position in which it is inoperative to move the rudder element to raised position both in forward and reverse travel of the craft below said sufficiently high speed.
Claim 4
Dependent Claim
23 words
Auxiliary rudder apparatus as claimed in claim 1 comprising means on said rudder element for manually effecting raising thereof to said inoperative position.
Claim 5
Dependent Claim
19 words
Auxiliary rudder apparatus as claimed in claim 3 wherein said means comprises a rod fixed to said rudder element.
Claim 6
Dependent Claim
24 words
Auxiliary rudder apparatus as claimed in claim 1 comprising means for locking said hydraulic cylinder to lock said rudder element in the raised position.
Claim 7
Dependent Claim
26 words
Auxiliary rudder apparatus as claimed in claim 5 wherein the locking means comprises a valve means coupled to the hydraulic cylinder for controlling water discharge therefrom.
Claim 8
Dependent Claim
54 words
Auxiliary rudder apparatus as claimed in claim 1 comprising a scoop member mounted on the nozzle and movable between an inoperative position out of the path of jet discharge from the nozzle, and an operative position in which it deflects the water jet from the nozzle forwardly to reverse the direction of the craft.
Claim 9
Dependent Claim
39 words
Auxiliary rudder apparatus as claimed in claim 7 comprising pins supporting said scoop member for pivotal movement, said hydraulic cylinder being connected at one end to said rudder element and at its other end to one of said pins.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |