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Peristaltic pump with accommodating rollers

  • US 4,095,923 A
  • Filed: 08/16/1976
  • Issued: 06/20/1978
  • Est. Priority Date: 09/25/1975
  • Status: Expired due to Term
First Claim
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1. A peristaltic pump which is capable of pumping two tubings of different diameter and which has an arcuate race;

  • one or more peristaltic pumping tubings disposed along the length of the race and having inlet and discharge portions;

    a rotary shaft mounted to rotate about an axis coincident with the axis of said race;

    a sweep arm;

    means to adjustably mount said sweep arm on said rotary shaft;

    a spindle fixedly mounted on said sweep arm in spaced relationship with said race, the constant distance between said spindle and said race being determined by the adjustment of the mounting of said sweep arm;

    bearing means rotatable on said spindle;

    a sleeve rotating about said spindle and supported by said bearing means;

    annular elastomeric means supported by said sleeve; and

    a rigid surface roller supported by said elastomeric means concentrically about said spindle;

    said elastomeric means permitting skewing of the roller axis;

    said rigid roller being of such size as to squeeze and substantially occlude said peristaltic tubing between the surface of said roller and the race at a given adjustment of said mounting of said sweep arm;

    whereby, when said rotary shaft is rotated, the said rigid surface roller sweeps along the length of the one or more peristaltic pumping tubings in said race, thereby stripping said peristaltic pumping tubings and pumping fluid contained therein and forcing said fluid from said inlet portion to said discharge portion, andwhereby, when two peristaltic pumping tubings of different diameters are utilized, the rigid surface roller can be variably deflected as a result of deflection of the elastomeric support therefor by variable force applied to its rigid surface by two peristaltic pumping tubings, despite the said constant distance between said spindle and said race, determined by said adjustment of the mounting of said sweep arm.

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