Patent ID: 7114620

Claim:
A screening machine comprising: a screen frame elastically supported on a fixed base and comprising a plurality of screen cheeks and screen frame crossbeams which are rigidly connected to said plurality of screen cheeks, a drive coupled to said screen frame for oscillating said screen frame; a swing frame elastically coupled to said screen frame, said swing frame comprising: a plurality of rubber blocks, a plurality of thrust rods elastically coupled to the screen cheeks via said plurality of rubber blocks, a plurality of fastening components rigidly fixed to and projecting from both sides of each of said plurality of thrust rods and extending parallel to said plurality of screen cheeks, a plurality of swing frame crossbeams rigidly fixed to each fastening component which connect said plurality of thrust rods, wherein at least one swing frame cross beam is fixed on each side of said thrust rods; and at least two screening surfaces formed by screening mats extending substantially parallel to each other, said screening mats being alternately compressed and stretched in sections wherein each of said screening mats are fastened to at least one swing frame crossbeam, which is moveably supported with respect to said screen frame, and wherein said screening mats are fastened to at least one screen frame crossbeam being rigidly fixed to said screen frame.