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Household appliance having plural coaxially rotatable or parallel linearly movable heads or tools

  • US 6,032,313 A
  • Filed: 05/06/1997
  • Issued: 03/07/2000
  • Est. Priority Date: 05/26/1995
  • Status: Expired due to Fees
First Claim
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1. A household appliance including a rotating head divided into a number n of coaxially rotatable members having respective contact areas for contacting a surface, where n is an integer greater than 1 and further comprising means for driving at least two of said n members at mutually different velocities, said velocities and contact areas of said coaxially rotatable members being selected such that a sum of torques resulting from rotation of said members in a first direction approximately equals a sum of torques resulting from rotation of said members in a second direction opposite the first direction when said heads contact said surface to balance said appliance and thereby minimize an effort needed to utilize the device.

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