发明名称 EXCAVATING TOOL
摘要 PROBLEM TO BE SOLVED: To provide an excavating tool capable of decentering the axis of a tool body surely in drawing out, in such an excavating tool that its axis meets the center axis of a casing pipe so that excavating holes may be formed in excavating, and that the axis is decentered to the center axis so that the tool may be drawn from the casing pipe after excavation. SOLUTION: A front cutting-blade 3 is mounted on the front end of a tool body 1 which rotates around an axis of O so that the axis O may be centered, and a pair of protruding cutting-blade parts 2, 2 protruding toward the side of the outer periphery of the tool are mounted on the more rearward side than the front cutting-blade part 3 of the outer periphery of the tool body 1 so that the protruding cutting-blade parts 2, 2 may be adjacent to each other in the peripheral direction. A pair of rear end surfaces 12B, 12B facing the tool rear end side of the protruding cutting-blade parts 2, 2 are inclined so as to face the rear end side of the tool as it approaches the inner peripheral side of the tool.
申请公布号 JP2000186485(A) 申请公布日期 2000.07.04
申请号 JP19980365699 申请日期 1998.12.22
申请人 MITSUBISHI MATERIALS CORP;KAJIMA CORP 发明人 HAYASHI TAKESHI;YOSHIDA KAZUYOSHI;TAKAGI KAZUHIRO;FUKUDA HIROYUKI;MUTA JUN;SONODA TAKEO
分类号 E21B10/64;E21B10/26;(IPC1-7):E21B10/64 主分类号 E21B10/64
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