| 摘要 |
<p>The sound produced by the movement of the teeth of a circular saw or band saw blade in air is substantially reduced by providing a cover including a pair of closely spaced parallel hard-wall plates positionable on both sides of the teeth. Preferably the plates are spaced apart by a distance less than 21 mm and extend beyond the tips of the teeth by a distance several times the space between the plates. Portions of the plates may be movable to expose the teeth during the cutting operation.</p> |
