Abstract: An apparatus for removing solids from a liquid flow stream comprising a bar screen for obstructing solids from the liquid flow stream and a reciprocal rake having a plurality of projection adapted for cooperation with the bars of the screen for removing solids accumulated thereon. The opposite sides of the rake are supported by guide rollers adapted for maintaining the rake projections in pre-determined relatively closely spaced relation to the bars during an upward raking stroke for effecting substantially complete removal of solids accumulated on the bars while preventing continued direct contact between the rake projections and the bars.

Abstract: A lift apparatus adapted for reliable, substantially maintenance-free operation in material transfer systems, including systems that are subject to considerable contamination. The lift apparatus includes an open top container, a support plate for normally supporting the container in upright position, and a ball screw drive for moving the support plate and container between a filling station in which material may be introduced into the container and a discharge station. The container is supported for relative pivotal movement with respect to the support plate, and a chain and sprocket arrangement is provided for automatically pivoting the container to a dumping position as it is raised into the discharge station and for returning the container to its normal upright position as it is lowered from the discharge station following dumping.