Patent ID: 8539639

Claim:
A dust cup comprising: a dust cup housing encompassing a dust cup chamber, said dust cup housing further comprising an air inlet and an air outlet defining a path for a dust laden air-stream to flow through said dust cup chamber, and which air outlet is arranged to be connectable to an air suction element, to which said path is in fluid communication; a filter assembly having a first end which is removably arranged at said air outlet for filtering said dust-laden air-stream; said filter assembly comprising an outer filter and an inner filter, wherein said outer filter and said inner filter are formed as receptacles which are concentrically and unidirectionally arranged with a respective receptacle opening directed towards said first end of the filter assembly, and wherein said inner filter is slidably insertable into said outer filter, and wherein in a mounted position said inner filter is arranged to be substantially fully inserted into said outer filter; characterized in that said filter assembly further comprising a fixing member which is arranged to retain the inner filter in a predetermined displacement position relative to said mounted position, in response to said inner filter being subjected to an extraction force for detaching said filter assembly from said dust cup housing.