Shaker screen

A vibrating screen apparatus comprising

• a support frame;
• a screening basket mounted on said support frame for vibratory movement and having opposite ends and sides,
• said screening basket having upright side walls;
• a screening deck on said basket;
• a pair of cross bars extending through said screening basket and having cross bar ends projecting outwardly from the sides thereof;
• means securing said cross bars to said screening basket for providing an integral vibrating unit;
• side beam means on both sides of the basket comprising a rhombus shaped central plate extending parallel to and spaced from the side wall, a peripheral wall formed integral with said central plate and extending around the periphery of said central plate and longitudinal sway braces secured between the peripheral wall and the ends of said basket;
• means securing the central plate to the projecting ends of said cross bars also in an integral vibrating unit with said cross bars and screening basket;
• a pair of tubes extending between said screen basket side walls;
• a pair of cross shafts, each shaft within one of said tubes, extending through said screening basket and projecting beyond at least one side wall of said screening basket,
• journeled support means connected to said central plate for supporting said cross shafts;
• a pair of gears on said projecting end of said pair of shafts meshing together to provide opposite rotation of said shafts;
• power means driving said shafts;
• and a disc-like weight secured to each of said shafts,
• said weights being semi-circular in shape and being of different mass to provide an oval vibrating stroke to said screening basket upon rotation of said shafts.