CPC F01N 1/023 (2013.01) [B25D 17/12 (2013.01); G10K 11/172 (2013.01); F01N 2590/06 (2013.01)] | 17 Claims |
1. A high pass muffler disposed in an air exhaust passage of a pneumatic tool, the high pass muffler comprising: an outer body having an inner surface; an inner body that is substantially hollow disposed within the outer body and including an aperture, wherein the inner body is adapted to allow for substantially unrestricted airflow through the air exhaust passage; and a channel formed in the inner surface and having a first terminal end disposed proximate to the aperture, a second terminal end disposed distal to the aperture, and a curved portion or an angular corner disposed between the first and second terminal ends to collectively create a Helmholtz type resonator.
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