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Variable displacement sealed pump

  • US 3,884,125 A
  • Filed: 11/20/1972
  • Issued: 05/20/1975
  • Est. Priority Date: 02/08/1971
  • Status: Expired due to Term
First Claim
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1. A sealed pump comprising:

  • a cylinder having a magnetically actuatable piston therein, the ends of the cylinder being closed and the piston being free from mechanical connections to the exterior of the cylinder;

    magnetic core means associated with the piston and cylinder;

    means for magnetically coupling the piston with said magnetic core means, and electrical winding means disposed to produce a magnetic field for reciprocating the piston, said pump having means forming a head in one end of the cylinder, said head means being longitudinally adjustable relative to the cylinder to vary the volume thereof, and means in which the head is mounted, said last means and head having threads comprising helical grooves positioned opposite each other forming a helical channel and means comprising a helical flexible sealing element positioned in the oppositely facing grooves forming the channel.

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