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Constant pressure pump

  • US 3,951,571 A
  • Filed: 08/26/1974
  • Issued: 04/20/1976
  • Est. Priority Date: 08/26/1974
  • Status: Expired due to Term
First Claim
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1. A constant-pressure liquid pump including:

  • an anvil;

    a ram mounted for movement in a path toward and away from the anvil;

    a deformable, resilient container having an exit port and positioned between the anvil and the ram;

    means for substantially constraining the liquid leaving the container to flow only through the exit port;

    the anvil and the ram so shaped as to present, perpendicular to the path of movement of the ram, a substantially constant area of contact with the resilient container;

    means for applying substantially a constant-force to the ram including a constant-force spring; and

    said applying means further comprises means for moving the ram and anvil together against the urging of the spring and means for releasing the ram for movement toward the anvil under the urging of the spring.

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