Patent ID: 7090431
Filing Date: 2006-08-15
Classification: B63C

Abstract:
1. An integrated lifting system for a boat cradle which automatically compensates for the variable distance between a fixed support and the surface of a body of water having a fluctuating depth over time wherein the cradle is raised and lowered by motors on the fixed support and the boat is carried by the cradle, said system comprising a level sensing module and a motor control module operatively interconnected, said level sensing module comparing the water line of the boat and the surface of the water, said level sensing module mounted on the cradle to determine the relative position of the water line of the boat and the surface of the water, said motor control module determining the direction of the cradle movement, said motor control module connected to the motors whereby said motor control module energizes the motors to move the cradle and said level sensing module signals said motor control module to stop the motors when the water line and the surface of the water reach a predetermined distance.