Patent ID: 9198550
Filing Date: 2015-12-01
Classification: A47L

Abstract:
1. A window cleaning robot comprising a first cleaning unit and a second cleaning unit, which are respectively attached to and move on opposite surfaces of a window by magnetic force, the window cleaning robot comprising: a first magnetic module included in the first cleaning unit; a second magnetic module included in the second cleaning unit; and a magnetic force or tension sensing part for sensing magnetic force between the first magnetic module and the second magnetic module; and a magnetic force controller for controlling the magnetic force between the first magnetic module and the second magnetic module, wherein the first magnetic module comprises a first magnet a second magnet and a third magnet, the first magnet being rotationally mounted between the second magnet and the third magnet, and the magnetic force controller rotates the first magnet so as to control the magnetic force between the first magnetic module and the second magnetic module.