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DUST INDICATOR FOR A VACUUM CLEANER

  • US 20130198993A1
  • Filed: 06/28/2011
  • Published: 08/08/2013
  • Est. Priority Date: 06/29/2010
  • Status: Active Grant
First Claim
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1. A dust indicator for a vacuum cleaner, said dust indicator being arranged in a wall at least partly defining a space of the vacuum cleaner that is set under negative pressure with respect to the outside of said wall during operation of the vacuum cleaner, said dust indicator comprising:

  • an air channel having an air inlet arranged at an outer side of said wall, and an air outlet arranged at an inner side of said wall, said air channel thereby providing an airflow into said space during operation of the vacuum cleaner due to said negative pressure; and

    a sensor arranged for detecting dust by means of sending and/or receiving an electromagnetic signal transmitted through said space, wherein said air channel is arranged such that said airflow prevents dust from sticking in an area of the path of the electromagnetic signal of said sensor; and

    a transparent window behind which said sensor is arranged, thereby obtaining shielding of the sensor from dust and debris within said space.

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