Patent ID: 7238095
Filing Date: 2007-07-03
Classification: B24B,B25F

Abstract:
1. A pneumatic grinder with improved muffling structure primarily composed of a driving portion, a grinding wheel fixing portion provided at one end of the driving portion, an exhaust mechanism combined with the other end of the driving portion by means of a combining portion thereof, a switch positioned at one side of the driving portion which is characterized by the exhaust mechanism that further comprises: a first housing fixed at one end of the driving portion by the compressing of the combining portion, and having a plurality of first exhaust openings penetrating through the inner surface and outer surface of the first housing and a first limit segment provided at the outer surface thereof; and a second housing, which is mounted around the periphery of the first housing to form an annular space between the inner surface thereof and the outer surface of the first housing, and having a second limit segment for being mated with the first limit segment whereby the second housing can be rotated around the first housing within a predetermined range, and a plurality of second exhaust openings located at the positions not corresponding to those of the first exhaust openings of the first housing.