Silencer for Air-Blasting Gun

Author:  Ted A. Arnold
Source:  US Patent 3,628,627
Doc ID:  1970040
Year of Publication:  1970
Abstract:  
A silencer adapted to be attached to an abrasive blasting gun comprises a tapered end portion and a straight barrel portion. The end portion forms an annular tapered airspace around the outlet of the blast-gun exit opening which helps to absorb energy from the air-abrasive stream and suppresses the sound produced at the exit end of the silencer.