US PATENT SUBCLASS 417 / 477.1
.~.~.~ Plural spaced engagement members or member portions

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.~.~.~ Plural spaced engagement members or member portions {6}
477.2  DF  .~.~.~.~> Cassette
477.3  DF  .~.~.~.~> Specific rollers or slides structure {5}
477.9  DF  .~.~.~.~> Specific backing member for flexible wall {1}
477.12  DF  .~.~.~.~> Specific flexible wall or interposed flexible member
477.13  DF  .~.~.~.~> Flexible tube without backing member
477.14  DF  .~.~.~.~> Endless chain or belt

DEFINITION

Classification: 417/477.1

Plural spaced engagement member or member portions:

(under subclass 476) Apparatus in which there is provided two or more elements or two or more portions of a common element which directly contact the flexible wall or interposed flexible member for rolling or sliding engagement therewith at spaced locations thereon, each of said elements or element portions serving to collapse the flexible wall. [figure]