| 摘要 |
A reaming tool 20 for enlarging a borehole includes a cylindrical body 21, and a plurality of blades 22 carrying cutting elements 23, the blades 22 being circumferentially spaced around the cylindrical body 21. Each of the blades 22 is provided with at least one support 24 for maintaining the blade 22 in a reaming position. Each blade 22 and its corresponding at least one support 24 is coupled to the cylindrical body 21 such that, in use, when a force is applied to the cutting elements 23 due to rotation of the cylindrical body 21 within a borehole, the corresponding at least one support 24 is placed substantially under one of tensile or compressive stress and the blade 22 is placed substantially under the other of tensile or compressive stress. |
