Rake classifier

A rake classifier comprising a tank having side and end walls, a rake structure, an electric motor having a motor shaft and motor-driven means for imparting raking movement to said rake structure, said rake structure positioned in said tank and having two pairs of upstanding hanger elements spaced along the length of said rake structure, said motor driven means comprising a driven slot in each hanger element with the slots of each pair aligned, a plurality of supporting guide surfaces provided on the walls of said tank with one of said guide surfaces adjacent each hanger element, wheel means at the upper end of each hanger element for contacting said supporting guide surfaces, a drive shaft for each pair of hanger elements passing through said aligned driven slots of the paired hanger elements, rollers mounted on said drive shafts and positioned in said driven slots, a crank element provided on each end of said driven shafts, a plurality of bearing shafts fixed in said side walls, one of said crank elements joining a first of said drive shafts to said motor shaft with the crank element at the other end thereof joining said first drive shaft to a bearing shaft, the second of said drive shafts connected at both ends thereof to crank elements which are connected to bearing shafts mounted in said side walls, and means for driving said drive shafts in synchronism comprising a first sprocket on said motor shaft, a second sprocket mounted on one of said bearing shafts associated with said second drive shaft and a drive chain engaging said sprockets.