| 摘要 |
A concrete cutting saw ( 10 ) includes a wheeled main frame ( 12 ) on which a blade support frame ( 14 ) is mounted for movement between upper idle and lower cutting positions. Low and high speed blade arbors ( 16, 18 ) are rotatably mounted on the blade support frame ( 14 ) and each has an arbor head ( 24, 26 ) for selectively and alternately mounting either a low or high speed rotary cutting blade without any blade interference with the other arbor head. A drive mechanism ( 32 ) rotatively drives the low and high speed blade arbors ( 16, 18 ) at low and high speeds such that concrete cutting can be performed at the best rotational speed for the particular job cutting to be performed.
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