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Filter sensor and indicator for vacuum cleaners

  • US 7,303,613 B2
  • Filed: 12/11/2003
  • Issued: 12/04/2007
  • Est. Priority Date: 12/11/2003
  • Status: Expired due to Term
First Claim
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1. A vacuum cleaner having a monitor for sensing the pressure in the flow chamber, comprising:

  • a housing having an inlet and an outlet;

    a motor mounted in the housing;

    a nozzle for receiving an intake device;

    a filter disposed between the nozzle and the motor to form a flow chamber between the filter and the motor;

    an indicator means for indicating a need to service the filter; and

    circuitry connecting the indicator means to a power source including a pressure actuated switch operatively connected to the flow chamber;

    the pressure actuated switch closing the circuit between the power source and the indicator when the pressure in the flow chamber is below a pre-determined minimum pressure threshold thereby indicating that the filter requires cleaning or replacement.

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