Control device for adjusting a variablepitch marine propeller

Claim 1

A CONTROL DEVICE FOR ADJUSTING A VARIABLE-PITCH MARINE PROPELLER AND AT LEAST ONE ENGINE DRIVING THE PROPELLER, COMPRISING SERVO ACTUATED MEANS FOR ADJUSTING THE PROPELLER PITCH; MEANS FOR VARYING THE SUPPLY OF POWER MEDIUM TO THE ENGINE DRIVING THE PROPELLER; A FIRST SPEED GOVERNOR OPERATIVELY CONNECTED WITH SAID MEANS FOR VARYING THE POWER MEDIUM SUPPLY SO AS TO INCREASE THE MEDIUM SUPPLY WHEN THE ENGINE SPEED DECREASES AND TO REDUCE THE MEDIUM SUPPLY WHEN THE ENGINE SPEED INCREASES, THE FIRST SPEED GOVERNOR BEING DESIGNED TO OPERATE WITH A RELATIVELY LARGE PERMANENT SPEED DROOP; A SECOND SPEED GOVERNOR OPERATIVELY CONNECTED WITH THE SERVO ACTUATED MEANS FOR ADJUSTING THE PROPELLER PITCH SO AS TO INCREASE THE PROPELLER PITCH WHEN THE PROPELLER SPEED INCREASE AND TO REDUCE THE PROPELLER PITCH WHEN THE PROPELLER SPEED DECREASES, THE SECOND SPEED GOVERNOR BEING DESIGNED TO OPERATE AT LEAST APPROXIMATELY WITH CONSTANT SPEED REGULATION AT A PREDETERMINED SPEED VALUE BETWEEN THE LIMITS OF SAID PERMANENT SPEED DROOP OF THE FIRST SPEED GOVERNOR; AND TWO ADJUSTING MEMBERS OPERATIVELY CONNECTED WITH SAID SPEED GOVERNORS, ONE SERVING TO ADJUST THE SPEED RANGE OF THE FIRST SPEED GOVERNOR AND THE OTHER SERVING TO SHIFT THE PREDETERMINED VALUE OF THE SPEED TO BE REGULATED BY THE SECOND SPEED GOVERNOR WITHIN THE LIMITS OF SAID PERMANENT SPEED DROOP OF THE FIRST SPEED GOVERNOR.