US PATENT SUBCLASS 417 / 477.11
.~.~.~.~.~ Adjustable backing

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}
477.9  DF  .~.~.~.~ Specific backing member for flexible wall {1}
477.11.~.~.~.~.~ Adjustable backing

DEFINITION

Classification: 417/477.11

Adjustable backing:

(under subclass 477.9) Apparatus wherein the position of the backing member of the flexible wall is changeable.

(1) Note. The change of position of the backing member accommodates different sizes of the flexible wall, or controls the degree of closure of the flexible wall, or eases the insertion or removal of the flexible wall or interposed flexible member. [figure]