Patent ID: 7861867

Claim:
A material screening system, relating to screening coarser parts of excavated material from finer parts of such excavated material, comprising: a) at least one screen structured and arranged to screen such coarser parts of such excavated material from such finer parts of such excavated material; b) at least one vertical support, structured and arranged to vertically support said at least one screen above at least one ground surface, comprising i) at least one front wall having at least one in-side, at least one out-side, at least one left edge, at least one right edge, at least one bottom edge, and at least one top edge; ii) at least one left side wall, comprising at least one left front end and at least one left back end, wherein said at least one left front end is fixedly connected to said at least one left edge; iii) at least one right side wall, comprising at least one right front end and at least one right back end, wherein said at least one right front end is fixedly connected to said at least one right edge, iv) wherein said at least one left side wall and said at least one right side wall are substantially parallel; v) wherein said at least one left side wall comprises at least one left substantially vertical bar member extending generally upward from said at least one left back end; and vi) wherein said at least one right side wall comprises at least one right substantially vertical bar member extending generally upward from said at least one right back end; vii) wherein said at least one left side wall comprises at least one left diagonal cross-brace member structured and arranged to provide diagonal cross-brace support between said at least one front wall and said at least one left substantially vertical bar member; viii) wherein said at least one right side wall comprises at least one right diagonal cross-brace member structured and arranged to provide diagonal cross-brace support between said at least one front wall and said at least one right substantially vertical bar member; c) wherein said at least one screen is attached to said at least one vertical support; and d) wherein said at least one screen comprises: i) a plurality of screen members structured and arranged to block the passage of such coarser parts of such excavated material and to allow passage of such finer parts of such excavated material; and ii) at least one support frame structured and arranged to support said plurality of screen members; e) wherein said at least one support frame comprises at least one camber structured and arranged to compensate for at least one deflection generated within said at least one support frame under at least one operational load.