Mobile screening apparatus

A self-propelled screening apparatus which is capable of screening material while it is moving comprising:

• a support frame having a longitudinal axis and a pair of opposed sides;
• a pair of driven endless tracks each supporting a respective one of said opposed sides of said frame such that said endless tracks move the apparatus over the ground, each track extending substantially throughout the length of the respective frame side;
• a screening device of substantially the same length as said endless tracks and overlaying said endless tracks and fixedly mounted on said support frame, said screening device having a sloping screen extending in a direction between said opposed sides of the support frame and generally perpendicular to said longitudinal axis for the support frame;
• a hopper mounted above the screening device and arranged to receive a supply of bulk material and to discharge the material to said screen so that the latter can separate the bulk material into separate portions which comprise non-screened material which is too large to pass through the screen and screened material which passes through the screen, in which the screen is arranged to discharge the non-screened material onto the ground adjacent one of the sides of the support frame;
• and
• a discharge conveyor mounted on said support frame and projecting therefrom in a direction generally parallel to the longitudinal axis thereof, said conveyor having a discharge end and a receiving end which is arranged to receive material which has passed through the screen, and said conveyor being operable to discharge such material via the discharge end in a direction longitudinally of the support frame.