Patent ID: 6428590
Filing Date: 2002-08-06
Classification: E01H,Y10S

Abstract:
A mobile debris collection machine having an improved filter system including a chassis, a debris collection pickup on said chassis, a debris container on said chassis, a vacuum system for carrying dust and debris from said pickup to said container,said vacuum system including a housing associated with said container and having a dust and debris inlet opening therein above said container, an outlet in said housing, a vacuum fan for creating an air stream that moves dust and debris into said housing and moves dust out of said housing, and a filter system for removing dust from said air stream and depositing debris into said container, said filter system including a first filter stage having a rotating filter element that separates debris from said air stream and is located upstream of said vacuum fan, a second filter stage that is located downstream of said vacuum fan, and a third filter stage downstream of said second filter stage and positioned outside of said housing.