Patent ID: 7735603

Claim:
A noise reducing device for a pneumatic tool, comprising: a single expansion chamber having a first end, an opposing second end, an outlet formed in the second end, and a longitudinal axis along the length thereof between the first and second ends of the expansion chamber; a tool port coupled to and in fluid communication with the expansion chamber, the tool port being located between the first and second ends of the expansion chamber and being oriented transverse to the longitudinal axis of the expansion chamber in such a manner as to cause fluid entering the expansion chamber from the tool port to whirl within the expansion chamber; and a tube located within the expansion chamber, the tube having a length extending along the longitudinal axis of the expansion chamber from the first end to the second end of the expansion chamber, the tube having a non-perforated portion and a perforated portion, wherein the non-perforated portion of the tube extends from the first end of the expansion chamber past the tool port, and wherein the non-perforated portion of the tube comprises a minority of the length of the tube.