Helical drilling apparatus, systems, and methods
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 31, 2013
Grant Date -
Jun 2, 2011
app pub date -
Feb 9, 2011
filing date -
Mar 26, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A down-the-hole assembly includes a housing having a central axis and a mechanical gear box positioned within the housing. The mechanical gear box is coupled to the housing such that rotation of the housing at a first rotational rate provides a rotary input to the mechanical gear box. A rotary cutting bit is coupled to the mechanical gear box. The mechanical gear box is configured to rotate said rotary cutting bit at a second rotational rate in response to that rotary input from the housing. The second rotational rate is greater than the first rotational rate. The mechanical gear box is also further configured to cause the rotary cutting bit to orbit about the central axis of the housing.
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