Patent ID: 6991043

Claim:
A pneumatic tool comprising: a shell comprising a chamber defined therein, a first passage communicated with the chamber and a second passage communicated with the chamber; a rotor installed in the chamber for rotation when driven by pressurized air flowing into the chamber through the first passage; a shaft extending to the exterior of the shell from the rotor; a trigger installed on the shell; a control device put in the first passage and connected with the trigger for controlling the first passage; and a muffler put in the second passage, the muffler comprising a plurality of rods arranged in at least one layer, with each of the plurality of rods including first and second ends and a periphery extending between the first and second ends, with the peripheries of the plurality of rods abutting in the at least one layer, with air flowing through the second passage being detoured around the peripheries and between the plurality of rods in the at least one layer.