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PULSEFREE PERISTALTIC PUMP

  • US 3,726,613 A
  • Filed: 10/12/1970
  • Issued: 04/10/1973
  • Est. Priority Date: 10/12/1970
  • Status: Expired due to Term
First Claim
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1. A peristaltic pump comprising:

  • a tube provided with a flexible wall having an inlet for a fluid to be conveyed, an outlet for said fluid and an operating zone between said inlet and outlet;

    driving means periodically engageable with said tube along said operating zone for deforming the wall thereof to advance said fluid toward said outlet in a series of recurrent operating cycles, said driving means comprising a set of driving elements and shaft means for intermittently moving each driving element into contact with said tube to obstruct same completely at a point advancing from said inlet toward said outlet in the course of an operating cycle;

    a pusher movable substantially at right angles to the wall of said tube at a location downstream of said zone, said pusher being capable of only a partial blocking effect; and

    cam means synchronized with said driving means for actuating said pusher to constrict said tube upstream of said outlet at a stage of each operatinc cycle in which the driving element closest to said pusher is substantially fully withdrawn from said wall for progressively allowing the tube to expand at said location during the remainder of an operating cycle, thereby smoothing the flow of said fluid through said outlet.

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