Positioning device for cleaning unit for cleaning basin, has interior column and exterior column, where interior column and exterior column are arranged to each other in movable manner

摘要

The positioning device has an interior column (26) and an exterior column (24), where the interior column and the exterior column are arranged to each other in a movable manner. One of the two columns carries a cleaning unit (16). An independent claim is also included for a method for cleaning the basin by positioning device.