Patent ID: 6336558
Filing Date: 2002-01-08
Classification: B62D

Abstract:
A combination of a tractor unit and a mobile screening plant which are detachably coupled together, and in which:the tractor unit comprises a tracked unit which is short in length relative to the length of the screening plant, and having a set of endless tracks which are operative to propel the combination, and a pivotable coupling detachably coupled with the screening plant and which is adjustable in height to facilitate coupling and uncoupling of the screening plant; and the screening plant comprises a screen box for screening bulk material into different size ranges, at least one discharge conveyor operative to discharge screened material to a discharge position spaced from the plant, and a connection at a forward end of the plant which is detachably coupled with the coupling on the tractor unit, and a wheel set supporting a rear end of the plant, whereby the combination is highly maneuverable via the pivotable coupling and relatively short length of the tractor unit so that progressively increasing stockpiles of screened material can be formed adjacent to the screening plant (a) by forward movement of the combination so as to move the discharge position of the discharge conveyor forwardly or (b) by causing the plant to pivot about an upright axis passing generally in the region of the wheel set so as to rotate the discharge position of the discharge conveyor.