Equipment for drilling vertical boreholes
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United States of America Patent
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Oct 18, 2005
Grant Date -
Aug 14, 2003
app pub date -
Nov 20, 2002
filing date -
Nov 20, 2001
priority date (Note) -
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Abstract
The invention relates to equipment for drilling a vertical borehole in hard ground, the equipment comprising: casing put successively into place in the borehole; a drilling machine having a rotary cutting head and presenting a structural frame; torque and thrust transmission means having a first end secured to the structural frame of the drilling machine; and securing means for securing the second end of the torque and thrust transmission means in translation and in rotation to said casing.
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