US PATENT SUBCLASS 417 / 476
.~.~ Deformation by rolling or sliding engagement member

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.~.~ Deformation by rolling or sliding engagement member {1}
477.1  DF  .~.~.~> Plural spaced engagement members or member portions {6}

DEFINITION

Classification: 417/476

(under subclass 474) Apparatus in which the means for collapsing the flexible chamber wall comprises an element which either directly contacts said wall or an additional flexible material member interposed between the wall and said element, the collapsing element having a rolling or sliding

engagement with the flexible wall or interposed flexible material member in performing the wall collapsing function.