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Dual piston pump with magnetically actuated pistons

  • US 5,662,461 A
  • Filed: 05/31/1996
  • Issued: 09/02/1997
  • Est. Priority Date: 10/31/1994
  • Status: Expired due to Fees
First Claim
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1. A hydraulic pump comprising, in combination:

  • a tube, a pair of pistons comprising an upstream piston and a downstream piston, both of said pistons being formed of magnetic material and freely slidably disposed within said tube, connector means connected to said downstream piston and extending through an aperture in said upstream piston, magnetic means for selectively generating magnetic flux to urge said pistons together, each of said pistons having valve means for supporting the fluid flow in one direction through said tube, and first spring means disposed within the tube and connected said connector means for urging said downstream piston toward a downstream direction of said flow, and second spring means between said pistons for urging them apart.

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