US Patent 7481860 Cyclonic separator for suction cleaner

A cyclonic separator/collector device for a suction cleaner, comprising a housing and at least one cyclonic separator disposed within the housing, the or each cyclonic separator having a cyclone body with a circumferential wall of which at least a major part is spaced from the housing; the space between the housing and wall of the cyclone body(s) receiving separated dust from the cyclonic separator(s); wherein the space between the cyclone body and the housing includes a sound-insulating material. The arrangement provides sound insulation for the cyclonic separators.