US3799096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transmission
Assignee: Vickers Inc
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Filing: 1972-01-17
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Granted: 1974-03-26
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Expires: 1992-01-17
Abstract
Abstract A remote control system for ship''s rudders includes a hydraulic rudder actuator and a reversible variable displacement pump connected to drive it, the pump displacement being under the control of a hydraulic bridge circuit utilizing a pair of bleed circuits controlled respectively by variable command orifices and variable response orifices. The command orifices are constituted by a pair of summing valves responsive to the algebraic sum (or difference) of the angular displacements of a command actuator on the one hand and the rudder actuator on the other hand. The command actuator is hydraulically driven and electrically controlled by a closed loop servo system including a helm control which may comprise an automatic pilot.
Inventors
- 👤 R Jeffery
- 👤 R Breeden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:22
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/08; B63H25/14; B63H25/18; B63H25/22; F; F15; F15B; F15B9/00; F15B9/02; F15B9/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A ship''s rudder control system comprising a hydraulic rudder motor and a reversible variable displacement pump for shifting the motor, means for controlling the pump displacement including a servomotor and a hydraulic bridge having a pair of bleed circuits carrying a continuous small flow of pilot control fluid, command means for varying the resistance in a first portion of the bleed circuits, response means for varying the resistance in a second portion of the bleed circuits as the pump displacement changes, said command means including a first member movable at command and a second member movable in follow-up motion responsive to shifting of the rudder motor.
Claim 2
Dependent Claim
106 words
A ship''s rudder control system comprising a hydraulic rudder motor and a reversible variable displacement pump for shifting the motor, means for controlling the pump displacement including a servomotor and a hydraulic bridge having a pair of bleed circuits carrying a continuous small flow of pilot control fluid, command means for varying the resistance in a first portion of the bleed circuits, response means for varying the resistance in a second portion of the bleed circuits as the pump displacement changes, said command means including a first member movable at command and a second member movable in follow-up motion responsive to shifting of the rudder motor.
Claim 3
Dependent Claim
32 words
A system as defined in claim 1 which includes a hydraulic actuator for the command means and a closed loop servo system connected to drive the actuator in response to helm input.
Claim 4
Dependent Claim
35 words
A system as defined in claim 2 in which the servo system includes an electrically operated directional valve hydraulically connected to control the actuator and a remotely positioned helm electrically connected to the directional valve.
Claim 5
Dependent Claim
24 words
A system as defined in claim 3 including a position responsive electrical feed-back device driven by the actuator and electrically connected to the helm.
Claim 6
Dependent Claim
25 words
A system as defined in claim 4 having a common source of pilot control fluid for the pump servomotor, the bleed circuits, and the actuator.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |