Patent ID: 8707973

Claim:
A dishwasher, comprising: a rack positioned in a washing space and a nozzle that disperses washing fluid into the washing space; a sump that collects washing fluid supplied to the washing space; a plurality of filters provided in the sump, the plurality of filters comprising a first filter and a second filter, wherein the first and second filters are each substantially cylindrical, with the first filter positioned concentrically within the second filter; and a cleaning device to clean the second filter, the cleaning device comprising: a rotatable shaft; a frame coupled to the shaft, the frame being disposed inside the second filter so as to surround the first filter, at least one blade coupled to the frame, the at least one blade protruding from the frame towards the second filter to scrape the second filter; and a holder to hold the at least one blade, the holder being movably positioned inside the second filter, wherein a movement of the holder causes the at least one blade to scrape the second filter, which dislodges foreign materials from the second filter.