A cyclone dust-collecting apparatus comprises an upper casing having an air suction port formed thereon, a lower casing connected to the upper casing to form a cyclone chamber, a guide unit disposed between the upper and the lower casing, and having a first channel for swirling a dirt-laden air drawn...http://www.google.co.uk/patents/US6977003?utm_source=gb-gplus-sharePatent US6977003 - Cyclone dust-collecting apparatus of vacuum cleaner
