Abstract: A conveyor apparatus has a pair of inclined, parallel, adjacent upwardly facing semicylindrical troughs, an elongated helical flight rotatably disposed in each trough, and a drive mechanism for effecting rotation of the helical flights. The lower ends of the troughs are received in a tank having spaced side walls and having spaced baffle walls between the side walls which are parallel to the side walls and extend above at least a portion of the top edge of each side wall. These top edge portions of the side walls are each adjustable about an axis normal to the side wall to a substantially horizontal position and are releasably fixable in such position. Solids introduced between the baffle walls are conveyed by the rotating flights to the upper ends of the troughs, and liquid so introduced passes under said baffle walls and over the adjustable edge portions of the side walls.

Abstract: A harpoon or chip conveyor having an arcuate trough fitted with material retaining members or barbs on its inner sides and a plurality of interconnected plows driven in backward and forward or reciprocal motion by a reciprocating hydraulic or air operated power unit. The material retaining members are so oriented that a small vertical portion faces the direction of travel of the material being conveyed. The arcuate trough is generally greater than 90.degree. and less than a complete 360.degree.. An outlet is provided at least at one end of the arcuate trough for discharging the material collected in the trough in response to the reciprocal motion of the plows.