Noise abatement device for a pneumatic tool

A noise-abatement device, comprising:

• a housing having a first end wall, a second end wall, an outlet in the second end wall, and a body extending between the first end wall and the second end wall, the housing defining an expansion chamber, the expansion chamber having a longitudinal axis extending along the length thereof;
• a port outlet extending through the body, the port outlet being oriented transverse to the longitudinal axis of the expansion chamber;
• and
• at least one tube located at least partially within the expansion chamber, the tube having a perforated portion and a non-perforated portion, wherein the length of the perforated portion is greater than the length of the non-perforated portion, wherein the non-perforated portion extends from the second end wall, past the port outlet, toward the first end wall, and wherein the at least one tube comprises a first end proximate the perforated portion and a second end proximate the non-perforated portion, and the first end of the at least one tube is sealed against the first end wall of the housing.

A noise-abatement device for use with a pneumatic tool, comprising:

• a housing having a first end wall, a second end wall, and a body extending from the first end wall to the second end wall, the housing defining an expansion chamber therein;
• at least one tube located at least partially within the expansion chamber, the at least one tube having
• a first end,
• an opposing second end,
• a non-perforated portion proximate the second end,
• a perforated portion proximate the first end, wherein the perforated portion includes a first set of perforations a first distance from the first end wall and at least a second set of perforations a second distance from the first end wall, wherein the second distance differs from the first distance, and wherein at least a portion of the perforated portion is located within the expansion chamber, and
• an outlet defined in the second end of the at least one tube;
• and
• a port outlet extending through the body into the expansion chamber, the port outlet being oriented transverse to a longitudinal axis of the expansion chamber.

A pneumatic tool, comprising:

• a tool body having a tool outlet fluidly coupled thereto;
• and
• a noise-abatement device fluidly coupled to the tool outlet, the noise-abatement device comprising
• a housing having a first end and a second end, the housing defining an expansion chamber,
• a port outlet coupled to the tool outlet, the port outlet extending into the expansion chamber, and
• at least one tube located at least partially within the expansion chamber, the at least one tube including a perforated portion, a non-perforated portion, and an exhaust outlet,
• wherein
• the perforated portion comprises a majority of the length of the at least one tube,
• at least a portion of the perforated portion is located within the expansion chamber, and
• the tool outlet is oriented transverse to the exhaust outlet whereby fluid directed from the tool outlet into the expansion chamber is caused to whirl within the expansion chamber around the at least one tube.