发明名称 EXCAVATOR
摘要 PURPOSE: To easily drill a hole having a substantially square cross section through formation of a machining member by providing a drilling blade at each top of an equilateral triangle and its inside and by rotating and revolving this machining member in a prescribed relation. CONSTITUTION: A drilling blade 11 is provided at each top of a substantially equilateral triangle and its inside, and the downside of a drilling action surface is formed as a machining member 10. This machining member 10 is mounted to a machining-member rotating support device 14 rotatably about its center G, this machining-member rotating support device 14 is mounted to a machining- member revolving support device 13. The center G is rotated by the machining- member rotating support device 14 at a radius (1/3<1/2> -1/2) times one side length of the triangle of the machining member 10. The machining member 10 is made to revolve three times in the direction to opposite the rotating direction.
申请公布号 JPH01158196(A) 申请公布日期 1989.06.21
申请号 JP19870316650 申请日期 1987.12.14
申请人 KUBOTA LTD 发明人 SUGAWARA SAKAE
分类号 E21B7/00;E21D9/10 主分类号 E21B7/00
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