Sidebank excavator with rotating vertical cutter assembly

In a sidebank excavator movable in a first transverse direction along and adjacent to an embankment and in a second transverse direction substantially opposite to the first transverse direction, the excavator having a conveyor assembly for conveying particulate material deposited on a receiving portion thereof to a discharge portion thereof remote from the receiving portion, the improvement comprising:

• an elongated cutter support assembly having a lower end connected to the excavator adjacent to the receiving portion of the conveyor assembly for rotation about the longitudinal axis of the cutter support assembly, and an upper end connected to the excavator with the longitudinal axis of the cutter support assembly extending upwardly from the lower end thereof;
• means for rotating the cutter support assembly about the longitudinal axis thereof in a selected one of a first rotary direction and a second rotary direction substantially opposite to the first rotary direction;
• a cutter having an inner end pivotally connected to the periphery of the cutter support assembly and an outer end disposed radially outwardly of the inner end thereof relative to the axis of the cutter support assembly, the cutter having an earth engaging portion extending generally outwardly from the outer end thereof relative to the axis of the cutter support assembly with a first tooth extending generally orthogonal to the axes of the cutter and the cutter support assembly generally in the first rotary direction, and a second tooth extending generally orthogonal to the axis of the cutter and the cutter support assembly but substantially opposite to the first tooth, the cutter being rotatable about the inner end thereof in a first pivotal direction to decrease the radial distance between the second tooth and the cutter support assembly relative to the radial distance between the first tooth and the cutter support assembly, and in a second pivotal direction to decrease the radial distance between the first tooth and the cutter support assembly relative to the radial distance between the second tooth and the cutter support assembly;
• and
• means for preventing the introduction of particulate material into the pivotal connection between the cutter and the cutter support assembly comprising a sleeve disposed coaxially around the cutter support assembly, the cutter being provided with arcuate edges along the medial portion thereof and extending through a rectangular-shaped arcuate slot in the sleeve.