US PATENT SUBCLASS 417 / 477.6
.~.~.~.~.~ Positively driven rollers

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
474  DF  .~ Elongated flexible chamber wall progressively deformed {2}
476  DF  .~.~ Deformation by rolling or sliding engagement member {1}
477.1  DF  .~.~.~ Plural spaced engagement members or member portions {6}
477.3  DF  .~.~.~.~ Specific rollers or slides structure {5}
477.6.~.~.~.~.~ Positively driven rollers

DEFINITION

Classification: 417/477.6

Positively driven rollers:

(under subclass 477.3) Apparatus wherein the rolling members are directly driven by a rotating drive means, such as shaft or gear for rotation.

(1) Note. The drive means causes the rolling numbers to rotate even if the flexible members were removed.

(2) Note. The arrangement can be similar to a sun gear driving planetary gears. [figure]