Patent ID: 7636982
Filing Date: 2009-12-29
Classification: A47L

Abstract:
1. A floor-cleaning robot, comprising: a housing including a chassis, wherein part of the chassis is configured as a deck; a powered differential wheel drive operative to propel the floor-cleaning robot for cleaning operations; a control module operative to control the floor-cleaning robot to effect the cleaning operations; a cleaning head including a dual-stage brush assembly comprising first and second asymmetric brushes mounted in combination with the deck and powered by a cleaning motor to sweep up particulates during cleaning operations, the second brush having an outer diameter greater than an outer diameter of the first brush positioned to contact a hard floor surface and to direct debris forward towards the first brush, and a dust collection bin for collecting particulates swept up by the brush assembly; wherein the first brush is positioned to not contact the hard floor surface but to redirect debris from the second brush into the dust collection bin; and wherein the first and second asymmetric brushes are counter-rotating.