US PATENT SUBCLASS 198 / 661
.~.~ Having axially varying capacity

Current as of: June, 1999
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198 /   HD   CONVEYORS: POWER-DRIVEN

618  DF  CONVEYOR SECTION {26}
657  DF  .~ Screw {11}
661.~.~ Having axially varying capacity

DEFINITION

Classification: 198/661

(under subclass 657) Apparatus wherein the conveyor section comprises one or more helical surface formations and which, by virtue of a changing pitch, diameter (overall or core), number of threads, etc., has a capacity which varies along its length.