Patent ID: 7247180

Claim:
In combination, a dust collection system and a removable drop-in silencer device therefor, said silencer device being adapted for use with said dust collection system, the latter comprising a dust separator including an air inlet pipe which receives from a dust conduit an air stream containing entrained dust particles, a drum disposed beneath said separator and into which said dust particles descend, a discharge pipe on said separator from which the air stream emerges after said dust particles have been separated therefrom, a cylindrical air filter disposed on a vertical axis and having an annular top surface and a round opening of a predetermined diameter leading down into said filter; a fitting connecting the discharge pipe to the top surface of the cylindrical air filter; and a clamp for removably securing said fitting to said cylindrical filter with said silencer device in place and depending within said cylindrical filter; the silencer device comprising a sleeve of an acoustic foam material having a diameter to fit into said round opening, and an open bottom end situated within said cylindrical air filter, and a flat transverse flange ring extending radially out from said sleeve at an upper end thereof to be secured by said clamp between said fitting and the annular top surface of said filter.