Patent ID: 7377485
Filing Date: 2008-05-27
Classification: B66D

Abstract:
1. A boat lifting system for placement onto an existing boat lift winch drive shaft having; a first drive coupling element on the winch drive shaft, the winch drive shaft normally being driven by a manual wheel on the shaft, the boat lifting system comprising a gear box, a powered drive motor having three phases of operation, a converter mounted to the boat lifting system and electrically coupled to said powered drive motor and an alternating current power source having a single phase of operation, said converter configured to convert single-phase alternating current power from said direct power source to three-phase power and provide said three-phase power to said powered drive motor, said gear box including a first gear driven by the powered drive motor, and a second gear, an output shaft, the second gear being mounted on the output shaft, said output shaft being tubular and slidable over a winch shaft, a second drive coupling element fixed on one end of the tubular shaft on an exterior of the gear box, the second drive coupling element adapted to mate with a first drive coupling element on an existing boat lift winch drive shaft to drive such winch drive shaft, and a fastener to hold the tubular shaft onto an existing winch drive shaft with the second coupling element on the tubular shaft in driving engagement with a first drive coupling element on such winch drive shaft.