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Membrane type fluid pump

  • US 5,681,152 A
  • Filed: 12/11/1995
  • Issued: 10/28/1997
  • Est. Priority Date: 04/08/1993
  • Status: Expired due to Fees
First Claim
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1. A diaphragm pump comprising:

  • a housing having an opening defined at one end;

    a diaphragm attached to the housing to extend over the opening;

    an inlet defined in the housing for receiving a fluid;

    a driving element attached to the housing, the driving element being in driving engagement with the diaphragm to vibrate the diaphragm;

    an orifice defined in the diaphragm, the orifice being adapted to permit a discharge of the fluid therethrough;

    a plunger disposed within the housing, the plunger being movable within the housing; and

    a spring disposed within the housing for biasing the plunger towards the diaphragm so that the plunger sealingly engages the diaphragm.

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