Patent ID: 8020705

Claim:
A screen assembly for use with a vibratory separator to screen material and convey solids, comprising: a) a frame, said frame mounted in the vibratory separator; b) a set of perforated curved screen supports, said screen supports being bonded to said frame and said screen supports are aligned parallel to the direction of the conveyance of the solids; c) at least one curved screen element mounted on at least one of said screen supports; d) a blocking mechanism to block outward movement of said at least one screen element, wherein said blocking mechanism includes a screen support flange formed along the top opening of one side of the screen support, at least one ridge, said ridge lying across the opening of the screen support from the screen support flange, aligned parallel to the direction of the conveyance of the solids, and featuring at least one slot, a hold down bar oriented along said at least one ridge over a first edge of said at least one screen element, said hold down bar featuring at least one slot corresponding to the at least one slot of the at least one ridge, and at least one hold down hook inserted through said at least one slot of at least one ridge, through said at least one slot of at least one hold down bar, wherein said hold down hook is configured to rotate about a horizontal axis through a first pin attached with said frame perpendicular to the direction of the conveyance of the solids, wherein said hold down hook is rotationally operable with said frame so that said hold down hook may rotate between an open position allowing outward movement of said hold down bar and said at least one screen element and a closed position blocking outward movement of said hold down bar and said at least one screen element.