Patent ID: 7875094

Claim:
A dust filter device, in particular for hand-guided power tools ( 12 ), comprising: a plate filter ( 18 ) with filter folds ( 16 ) and a sealing frame ( 66 ); and at least one spreader ( 14 ) configured for spreading the filter folds ( 16 ) of the plate filter ( 18 ), wherein the spreader ( 14 ) has at least one spreading means ( 24 , 28 ) configured to be placed onto sides of the filter folds ( 16 ) of the plate filter ( 18 ) that are oriented away from the sealing frame ( 66 ) of the plate filter ( 18 ), wherein the spreading means ( 24 ) is embodied as a spreading comb comprising a receiving region ( 70 ) provided with evenly spaced groove-like recesses ( 72 ), wherein the evenly spaced groove-like recesses ( 72 ) have a trapezoidal cross section, wherein parallel lateral lengths of the trapezoidal cross section have unequal lengths.