| 摘要 |
<p>PURPOSE: To prevent the rotation of a tool for cutting an existing main pipe and expanding it so that a main pipe to be exchanged is passed through the existing main pipe by supporting a guide roller an a cutter by a supporting body having a guide side and a cutting side. CONSTITUTION: A tool is provided with a rod-like supporting member 11, and pulled in an existing main pipe by being pulled through a wire, etc., with one end connected to a screw eye 12. A threaded cutter ring 14 is provided on a rear end part of a supporting rod 11 to enable the coupling with an expander 95. A plurality of rectangular notches 17 are formed in an upper part of the supporting rod 11 along the longitudinal direction, and a guide roller 16 is pivotably supported thereby so as to be projected from an outer circumferential surface of the supporting rod 11. A plurality of similar notches are formed in a lower part of the supporting rod 11, and a notch wheel 22, first to third cutter wheels 25, 29, 32 with progressively increasing diameter, and a deburring member 36 are pivotably supported in this order from their forward side.</p> |
