| 摘要 |
PROBLEM TO BE SOLVED: To provide an over-cutter device compact in size, easy to handle, and capable of withstanding a large excavation load. SOLUTION: This over-cutter device is provided with a jack case 7 having a cylindrical guide part 11 and a semi-circular fitting part 12, a hydraulic jack 8 provided with a jack tube 20 and a piston rod 21, and a cutter 9, the jack tube 20 is slidably fitted to the guide part 11, the piston rod 21 is fixed to the fitting part 12, and the cutter 9 is fixed to the jack tube 20. The over-cutter device compact in size and easy to handle is capable of withstanding a large excavation load by supporting an excavation load of the cutter 9 by the guide 11 through the jack tube 20. |
