Control device for a trim tab of a boat

Abstract

A control device for a trim tab of a boat, includes at least a pair of stabilizers, one for each side of the boat, formed by blades ( 2 ) and by a control actuator ( 3 ) for each blade which determines the change in angle of the blade itself compared to the ideal flat water surface, and including a joystick which, with its movement, controls the actuators, in order to determine the positioning of the stabilizers and, therefore, to obtain predetermined conditions of the trim tab.

1 . Control device for a trim tab of a boat, said trim tab comprising at least a pair of stabilizers, one for each side of the boat, formed by blades and by a control actuator for each blade which determines the change in angle of the blade itself compared to an ideal flat water surface,
 said control device comprising a joystick which, with movement thereof, controls said actuators, in order to determine the positioning of the stabilizers and, therefore, to obtain predetermined conditions of the trim tab.   
     
     
         2 . Device as by  claim 1 , wherein for each of the predetermined conditions, there corresponds a predetermined movement of the joystick which operates at least a switch. 
     
     
         3 . Device as by  claim 2 , wherein the predetermined conditions are stabilizers raised, stabilizers lowered with a bow of the boat in a low position, correction of the boat listing to starboard and correction of the boat listing to port. 
     
     
         4 . Device as by  claim 3 , wherein the movement of the joystick in each of four directions orthogonal to one another determines the control corresponding to one of the four predetermined conditions by mean of operation of at least one of the four switches. 
     
     
         5 . Device as by  claim 4 , wherein the directions orthogonal to one another refer to a dial of a clock, respectively as follows:
 stabilizers lowered with the bow in the low position, at 12 o'clock;   stabilizers raised, at 6 o'clock;   port stabilizer raised and starboard stabilizer lowered to correct a starboard angle, at 3 o'clock; and   port stabilizer lowered and starboard stabilizer raised to correct a port angle, at 9 o'clock.   
     
     
         6 . Device as by  claim 1 , further comprising:
 switches,   a control circuit,   a container body in which the switches and the control circuit are inserted, and the joystick is positioned on top of the container body in a center of a circumference which presents graphic indications relative to the predetermined conditions of the trim tab of the boat.   
     
     
         7 . Device as by  claim 6 , wherein each actuator includes a motor, and the control circuit transforms the movement of the joystick in operation of motors of each actuator. 
     
     
         8 . Device as by  claim 7 , wherein the switches are positioned to take advantage of a reverse polarity voltage for reversing rotation of DC motors of the actuators and consequently movement of the actuators.