Screens

Claim 1

A PLANAR SCREEN STRUCTURE FOR SORTING AND CLASSIFYING MATERIAL WITHOUT IMPARTING DAMAGING FORCES TO SAID MATERIAL, WHICH SCREEN STRUCTURE COMPRISES A PLURALITY OF ELONGATED SCREEN FORMING RODS HAVING A PRESELECTED CROSS-SECTIONAL CONFIGURATION, A PLURALITY OF CROSS BARS, SAID CROSS BARS BEING MOUNTED IN PREDETERMINED SPACED RELATION TRANSVERSELY OF AND BENEATH SAID SCREEN FORMING RODS AND BEING SECURED TO SAID SCREEN FORMING RODS SO AS TO MAINTAIN SAID RODS IN DESIRED SPACED PARALLEL RELATION, SAID JOINED SCREEN FORMING RODS AND CROSS BARS DEFINING REGIONS OF PRESELECTED SIZE WHERETHROUGH A PORTION OF THE MATERIAL BEING SCREENED MAY PASS, AND A PLURALITY OF ELONGATED READILY REMOVABLE RESILIENT COVERINGS, EACH OF SAID COVERINGS HAVING A SLOTTED MATING PORTION ADJACENT THE LOWER SURFACE THEREOF, SAID SLOTTED MATING PORTION BEING FORMED TO COMPLEMENT THE CROSS-SECTIONAL CONFIGURATION OF THE SCREEN FORMING RODS AND HAVING GRIPPING SURFACES PROPORTIONED TO MATE WITH, ENCOMPASS, AND FRICTIONALLY GRIP ONLY THE UPPER PORTION OF SAID SCREEN FORMING RODS.