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Controlled pumping system

  • US 4,089,624 A
  • Filed: 06/04/1976
  • Issued: 05/16/1978
  • Est. Priority Date: 06/04/1976
  • Status: Expired due to Term
First Claim
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1. A pumping system for dispensing controlled variable amounts of pumpable material comprising:

  • means forming a support housing,a pump cylinder assembly mounted on said housing and including pump cylinder means forming a pump chamber, said pump cylinder assembly including inlet and outlet means for the material being pumped,a pump piston and lead screw assembly mounted on said support housing for generally axial movement of the pump piston into and out of said pump chamber,driven nut means rotatably mounted in said support housing and receiving said lead screw,stationary seal means positioned at one end of said pump cylinder assembly and forming a fluid tight seal between said piston and pump cylinder means preventing leakage between said piston and pump chamber,said seal means being a distance from said drive nut which remains fixed during movement of said pump piston whereby the geometry between the seal means and said pump piston is maintained the same during movement of said pump piston relative to said seal means,said pump piston including an outer peripheral surface spaced from the opposing surface of said pump chamber and movable in sealing contact relative to said stationary seal means,means mounted on said pump piston and lead screw assembly to prevent rotation thereof, andmotor means connected to effect rotation of said driven nut means whereby said pump piston is reciprocated relative to said pump cylinder assembly for pumping and filling said pump chamber.

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