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Automatic filter cartridge

  • US 6,152,998 A
  • Filed: 03/09/1999
  • Issued: 11/28/2000
  • Est. Priority Date: 03/09/1999
  • Status: Expired due to Term
First Claim
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1. A filter cartridge for removing dust and airborne particulates from an airflow that is flowing through a ducting of an air conditioning system which comprises:

  • a frame formed with an aperture, said frame being positioned in said ducting for receiving the airflow in said ducting through said aperture, said airflow having airflow characteristics;

    a supply roller;

    a first container fixedly mounted on said frame for holding said supply roller;

    a take-up roller;

    a second container fixedly mounted on said frame opposite said aperture from said first container for holding said take-up roller;

    an elongated strip of filter medium having a first end attached to said supply roller and a second end attached to said take-up roller to extend said filter medium across said frame to cover said aperture;

    a computer means for analyzing said airflow characteristics in said ducting to generate a control signal when said airflow characteristics indicate said filter medium in said aperture is dirty; and

    a means mounted on said second container for rotating said take-up roller in response to said control signal to advance said filter medium from said supply roller to said take-up roller.

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