Patent ID: 7293521

Claim:
A lifting device for raising and lowering water crafts, comprising: a frame attached to a support; a rotatable crank member attached to the frame; a fluid operated actuator having one end attached to the frame and an another end attached to the crank member; an arm having a first end attached to the crank member and a second end; and a cradle supporting a watercraft which is attached to the second end of the arm, wherein the fluid actuator lowers and raises the cradle with the supported watercraft; a carriage; at least one upper roller attached to the carriage, the upper roller for riding on an upper surface of the cradle; and at least one lower roller attached to the carriage, the lower roller for riding against a lower surface of the cradle, the upper and the lower rollers allowing the carriage to roll relative to the cradle and allow the carriage to support a watercraft thereon in a substantial level position while the arm and the attached cradle are being raised and lowered by the arm.