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Vacuum cleaner with power control in dependence on a mode of operation of an electrical brush

  • US 5,881,430 A
  • Filed: 02/24/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 08/25/1995
  • Status: Expired due to Term
First Claim
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1. A vacuum cleaner comprising a housing, a suction unit comprising a vacuum chamber accommodated in the housing and drivable by means of a first electric motor, a suction attachment having a rotatable brush which is adapted to be driven in a mode of operation selected from multiple modes of operation by the user and which is drivable by means of a second electric motor, a control unit for controlling an electric current through the first motor, and means in operative association with said rotatable brush and said control unit for enabling the user to select a mode of operation of the rotatable brush,wherein the current through the first motor is controllable by means of the control unit as a function of the mode of operation of the brush that is selected by a user of the vacuum cleaner, andwherein the control unit comprises means for controlling the current through the first motor in such a manner that an air pressure in the suction attachment does not decrease below a first limit value, a measurement of an air flow in the vacuum cleaner does not exceed a second limit value, and at least one of the two limit values is reached, the control unit determining at least one of the two limit values in dependence upon the mode of operation selected for the brush by the user.

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