US PATENT SUBCLASS 417 / 477.7
.~.~.~.~.~ Biased rollers or slides

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}
477.7.~.~.~.~.~ Biased rollers or slides

DEFINITION

Classification: 417/477.7

Biased rollers or slides:

(under subclass 477.3) Apparatus wherein the rolling or sliding elements are biased to engage or to disengage the flexible wall or interposed flexible member.

(1) Note. The biasing can be caused by means such as a spring or weight or fluid pressure. [figure]