| 摘要 |
<p>The present invention provides a power tool comprising: a working head (14) for holding a working element; a motor (16) having a motor output shaft (18) for driving said working head (14); a duct (26) having an inlet (28) locatable in proximity to a point of contact between the working element and a workpiece; a dust collection chamber (30) having an inlet (32) in fluid communication with an outlet from said duct (26), and an outlet (34) in fluid communication with atmospheric air; and a fan (48) operable to transport air from the inlet (28) of said duct (26) to the inlet (32) of said dust collection chamber (30); wherein the dust collection chamber (30) has a substantially circular cross section about an axis, the inlet (32) to the dust collection chamber being at the perimeter of said circle and the outlet (34) of said dust collection chamber being drawn from within said circle, in the region of said axis; the power tool further comprising: a first, drive wheel (40) mounted on the motor output shaft (18); a second, driven wheel (42) mounted on a second shaft (44); and a drive belt (50) connecting the first, drive wheel (40) to the second, driven wheel (42), for transmitting power from the motor output shaft (18) to the second shaft (44); wherein the fan (48) is also mounted on the second shaft (44).
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