Patent ID: 7419348

Claim:
An incremental material urging system comprising: (a) a container structure having a rear end and a forward end and side wall substructures, (b) a material urging structure, (c) each side wall substructure of said container structure is provided with a slot extending substantially along the length of said side wall substructure, (d) material urging structure activating means for incrementally advancing said material urging structure from a retracted position at said rear end of said container structure, to a fully advanced position at said forward end of said container structure, where said forward end is a discharge end, wherein said material urging structure is incrementally advanced and retracted by engagement with reciprocating beams acting along each side of said container structure; said reciprocating beams provided with a plurality of thrust assemblies disposed at substantially equal intervals along the length of said beams, and wherein each of said slots in said side wall substructure is co-linear with a rail system; said rail system adapted to support and guide a said reciprocating beam.