Patent ID: 8689392

Claim:
A suction device to suction mop dust capable of being coupled to a hose connected to a vacuum cleaner main body, said suction device comprising: a hose coupling unit attachable to a midway of said hose; a cleaning unit having a cylindrical configuration and being attached to said hose coupling unit so as to be rotatable with respect to said hose coupling unit; wherein each of said hose coupling unit and said cleaning unit has a suction port, wherein an overlapping amount between said suction port of said cleaning unit and said suction port of said hose coupling unit is changed by a rotation of the cleaning unit with respect to said hose coupling unit, and wherein said overlapping amount between said suction port of said cleaning unit and said suction port of said hose coupling unit is gradually increased as said cleaning unit is rotated from a position where said cleaning unit is approximately parallel to said hose coupling unit to a position where said cleaning unit forms an angle of approximately 90 degrees with respect to said hose coupling unit.