Patent ID: 6033454
Filing Date: 2000-03-07
Classification: B01D,Y10S

Abstract:
A compact, nestable air filter comprising a generally rectangular fame having surfaces defining generally a plane, and a pair of spaced parllel side rails and a pair of spaced parallel end rails along outer edges of said plane-defining surfaces, said rails flaring outboardly at an obtuse angle from said plane-defining surfaces when said frame is unconfined, one of said rails at each corner of said rectangular frame being provide with tab means, and the other, contiguous of said rails at said corner having an open end into which said tab means extends, said tab means having a compound angled contoured outer surface including first, sharply angled section and a second, straight edge section engaging an end opening-defining inner surface of said other rail along a free edge of said other rail whereby said rails are held in flared position along said first edge section when said frame is unconfined and permitted to be moved to a position generally perpendicular to said plane-defining surfaces along said second edge section, said tab being of a length compared with the height of said open end to be held against movement clear of said open end in every position of said rails when said frame is assembled, to limit the outward flare of said rails and to ensure that the corners of said rails are substantially closed in every position of said rails.