| 摘要 |
<p>PROBLEM TO BE SOLVED: To extend an outer diameter of a tool with simple structure, and realize an optional tool length by preventing polishing from generating unevenness, in a kind of tools for polishing an inner diameter of a work. SOLUTION: A cylindrical mandrel 2 around which an abrasive cloth 7 is wrapped is attached to a tip of a rotation shaft 5, and a pull rod 3 is inserted to the mandrel 2 to be slidable in an axial direction. The mandrel 2 is cut at predetermined intervals, whereby at least two or more slant surfaces 21b, 22b, 23b whose extensions of adjacent cross sections intersect are formed. The pull rod 3 is provided with a locking member 33 which locks with the mandrel 2, and the pull rod 3 is pulled toward the rotation shaft 5 whereby the mandrel 2 is moved along the slant surfaces 21b, 22b, 23b. Accordingly, the outer diameter of the mandrel 2 is extended.</p> |
