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Pump with inlet and outlet simultaneously exposed to pump chamber and method of operating same

  • US 5,639,220 A
  • Filed: 08/17/1995
  • Issued: 06/17/1997
  • Est. Priority Date: 09/09/1994
  • Status: Expired due to Term
First Claim
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1. A pump comprising:

  • a cylindrical pump body;

    a first moving member and a second moving member slidably fitted in the pump body in a liquid-tight fashion and in an axially opposite arrangement, the first moving member and the second moving member forming a pump chamber therebetween;

    a suction port and a discharge port formed in the pump body, said suction port and said discharge port being controllably opened and closed by the first moving member and the second moving member;

    a first cam member located proximate the first moving member; and

    a second cam member located proximate the second moving member such that the first cam member and second cam member cause the first moving member and the second moving member to move at substantially equal speeds when the pump chamber is open to both the suction port and the discharge port.

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