Patent ID: 7850147
Filing Date: 2010-12-14
Classification: B63B,B63C,B66D,F16H

Abstract:
1. A boat lift drive system for raising and lowering a boat, the system comprising: a drive motor having a drive shaft; a first shaft connected to the motor drive shaft, the first shaft including a first worm; a first worm wheel engageable by the first worm, the first worm wheel rotating a second shaft, a second worm on the second shaft, at least one of said first and second worms being of copper alloy secured to its associated shaft; a second worm wheel rotated by the second worm; the second worm wheel being operatively connected to a spool having a cable disposed thereabout and operatively disposed for lifting a boat; the second worm wheel being ferrous and the second worm being copper alloy.