Patent ID: 7841422

Claim:
Apparatus comprising: a) at least one mobile housing assembly having at least one set of wheels and capable of being towed; b) at least one separator screen to separate at least one selected soil from at least one unselected soil on the basis of at least one selected particle-size of soil; c) wherein said at least one separator screen comprises apertures adapted to permit at least one selected particle size of soil to pass through said at least one separator screen; d) wherein said at least one separator screen is carried by said at least one mobile housing; e) wherein said at least one separator screen is fixed relative to said at least one mobile housing assembly; f) at least one unprocessed soil collector adapted to collect at least one unprocessed soil onto said at least one separator screen; g) at least one soil pusher adapted to push the at least one unprocessed soil over said at least one separator screen; h) wherein said at least one soil pusher is freely moveable about exactly one axis positioned relatively distally from said at least one unprocessed soil collector; i) wherein said at least one soil pusher comprises at least one powered pusher to provide powered pushing movement of at least one unprocessed soil over said at least one separator screen; j) wherein said at least one powered pusher comprises a plurality of paddles structured and arranged to assist pushing at least one unprocessed soil over said at least one separator screen; k) at least one automatic jamming reducer to automatically adjust the angle of incline of said at least one soil pusher about said axis to reduce jamming between said at least one powered pusher and said at least one separator screen during separation of the at least one unprocessed soil; l) at least one pin retainer structured and arranged to movably guide motion of said at least one soil pusher relative to said mobile housing assembly; m) wherein said at least one pin retainer is affixed to said mobile housing assembly; and n) wherein said at least one soil pusher further comprises at least one aperture-containing support member which receives said at least one pin retainer.