Vacuum cleaner with device for adjusting sensitivity of dust sensor

  • US 5,136,750 A
  • Filed: 06/28/1991
  • Issued: 08/11/1992
  • Est. Priority Date: 11/07/1988
  • Status: Expired due to Term
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First Claim
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1. A vacuum cleaner with a rotatable cleaning member driven by a motor and housed in a suction nozzle which contacts an object to be cleaned, the motor being turned on upon closing of a first switch, the vacuum cleaner comprising:

  • dust sensor means for detecting dust in air drawn through the suction nozzle;

    shortable resistance means connected to the dust sensor means for adjusting the dust detection sensitivity of said dust sensor means;

    means for coupling the resistance means to the first switch for decreasing the sensor sensitivity upon closing of the first switch; and

    means connected to the output of the sensor means for indicating the presence of intake dust.

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