| 摘要 |
An improved portable circular saw with a pair of semicircular discs having a rotary sawing cutter disposed therebetween, the semicircular discs being fixedly secured to the upper surface of a table and vertically extending along the rotary sawing cutter with a close clearance kept therefrom, whereby remarkably high noise reduction and dust collection are ensured with substantially reduced danger of or without any danger of injuring of a part of a human body. According to another aspect of the invention a dust collecting device is provided having a dust collecting hood arranged above the upper half of the rotary sawing cutter, an inner wall included in the dust collecting hood to surround the central part of the rotary sawing cutter and a bottom plate on the table. A pair of semicircular plates may be fixedly secured onto the longer sides of the inner wall vertically extend along the rotary sawing cutter in the same manner as the aforesaid semicircular discs.
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