| 摘要 |
<p>A general purpose circular spherical surface cutting device coping with various manhole diameters has a device body (1) provided with a drive means for attaching an arcuate cutter having a plurality of different curvatures depending on the diameter of a manhole M removably to the rotating shaft of a drive source, and a board (3) for mounting the drive means. The frame equipped with a pulley for mounting the mounting board (3) is provided with two right and left arm rods (9, 9) on which a pair of right and left shaft holes (10, 10) for supporting many manholes of different diameter on an aligned central axis are provided. An adjusting rod having a pivot (15) matching the shaft holes (10, 10) is provided removably in the insertion hole (18) of the mounting board (3) such that the length can be adjusted, and the mounting board (3) pivoted at the pivot (15) is rotated vertically through a tiltable adjusting rod (20) provided between the mounting board (3) and the frame (2).</p> |
