Powered boat lift mechanism

A boat lift comprising:

• a frame;
• an elevator operable on the frame to raise and lower a boat hull supported on the elevator;
• a main operating mechanism for operating the elevator;
• the main operating mechanism comprising a gear box which is mounted on the frame and has an output shaft, an input shaft, and a torque multiplication mechanism through which the input shaft is coupled with the output shaft;
• a coupling system which couples the output shaft with the elevator;
• a large diameter wheel which turns by turning the input shaft;
• an auxiliary operating mechanism for operating the elevator comprising a bar on the frame, a small diameter wheel, an axle shaft supporting the small diameter wheel for rotation about an axis on a part which can slide along a length of the bar to a location which places a circumference of the small diameter wheel in tangential contact with a circumference of the large diameter wheel for applying tractive force to turn the large diameter wheel and operate the elevator when the small diameter wheel rotates about the axis;
• and
• an electric motor drive for rotating the small diameter wheel to cause the smaller diameter wheel to apply tractive force to turn the large diameter wheel, the electric motor drive having a pistol-grip handle containing a finger-operable trigger for controlling operation of the electric motor drive.