Ships – Steering mechanism – Rudders
Patent
1996-07-02
1998-07-21
Swinehart, Ed L.
Ships
Steering mechanism
Rudders
114150, B63H 2506
Patent
active
057821950
ABSTRACT:
A rudder operating apparatus is for swinging a rudder of a marine vessel through approximately one-half of a revolution about a rudder axis for braking and/or reversing the vessel. The apparatus comprises an initiating actuator, a main linear actuator and a controller responsive to position of the rudder. The initiating actuator cooperates with the rudder to initiate movement of the rudder through a switching angle when the rudder is in a straight position thereof for straight line travel. The main linear actuator cooperates with the rudder and is extensible and retractable. The controller cooperates with the actuators to actuate the initiating actuator and the main actuator in sequence. The initiating actuator is actuated first to rotate the rudder through the switching angle when reactive forces from the water are low, after which the main actuator is actuated to apply additional force at an increasing mechanical advantage to generate sufficient torque to increase the rudder angle up to approximately 90 degrees from the straight position to provide a reversing force. Preferably, the initiating actuator is an extensible and retractable hydraulic linear actuator, and both actuators cooperate with at least one tiller arm extending from a rudder stock of the rudder.
REFERENCES:
patent: 3302604 (1967-02-01), Stuteville
patent: 3335688 (1967-08-01), Leigh
patent: 3530766 (1970-09-01), Pilch
patent: 4172571 (1979-10-01), Bowdy
patent: 4836810 (1989-06-01), Entringer
patent: 5266060 (1993-11-01), Onoue
patent: 5289756 (1994-03-01), Kobelt
KOBELT Publication, Model 7174 Rudder Angle Feed Back, 1989.
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