Patent ID: 6508188
Filing Date: 2003-01-21
Classification: B63B,B63G,B63H,F42B,Y02T

Abstract:
A marine vessel unit comprising:a plurality of leading rollers and a plurality of trailing rollers; an internal framework for connecting said leading rollers to said trailing rollers so as to form a substantially tubular structure; and an endless revolving belt covering said rollers and said framework such that said endless revolving belt defines an outer tubular surface on the outer portion of said tubular structure and an inner tubular surface on the inner portion of said tubular structure, said endless revolving belt being movable about said rollers and framework such that the outer tubular surface moves from said leading roller toward said trailing rollers and said inner tubular surface moves from said trailing rollers toward said leading rollers and said inner tubular surface defining a center tube chamber; said endless revolving belt further defining a substantially fluid-tight inner chamber housing said tubular structure; and a forward and rear sealing skirt in slidable contact with the outer tubular surface of said endless revolving belt.