Autonomous surface cleaning apparatus

  • US 5,940,927 A
  • Filed: 12/23/1997
  • Issued: 08/24/1999
  • Est. Priority Date: 04/30/1996
  • Status: Expired due to Term
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First Claim
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1. An autonomous device (10) adapted to automatically move on a work surface (11) removing dirt, such as gravel, sand, dust particles and the like, from said work surface, said device (10) comprising a chassis (12) provided with wheels and with a brush roller (20) rotated by a brush roller motor (22) during said movement for the purpose of brushing up the dirt towards a suction duct (23) wherefrom, by means of a suction air stream, the dirt is conveyed to a dust container (24), an electronic control device (25) being provided for the control of the drive motor (22) of the brush roller, characterized in that if the movement of the brush roller (20) is blocked or obstructed to a predetermined extent the control device (25) is arranged to stop the brush roller motor (22) and then transitorily activate the brush roller motor (22) in the opposite direction and, finally, to reconnect the brush roller motor (22) to operate in the original direction of rotation.

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