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Helically actuated positive-displacement pump and method

  • US 7,883,325 B2
  • Filed: 03/24/2006
  • Issued: 02/08/2011
  • Est. Priority Date: 03/25/2005
  • Status: Active Grant
First Claim
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1. A fluid-characteristic changing structure, comprising:

  • first and second structures, each of which is movable relative to the other by being rotatable relative to the other, such that they rotate in opposite directions and wherein when rotated in opposite directions relative to one another, said first and second structures are movable in an axial direction, which extends between said structures, relative to the other; and

    a plurality of spring-biased connecting parts, connecting said first and second structures, moving to change a fluidic characteristic of a chamber defined between said connecting parts from a first state to a second state, wherein said spring biased connecting parts assume a helical shape in at least one of the two states, and wherein said change in fluidic characteristic comprises a fluid pump operation.

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