Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2005-04-19
2005-04-19
Walker, Zakiya (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S385000
Reexamination Certificate
active
06880648
ABSTRACT:
An apparatus for the directional drilling of bore hole through a solid substrate includes a main bore head mounted for rotation on a flexible drive shaft and a pilot bore head for weakening a region of substrate in advance of the main bore head, the weakened region being eccentrically located relative to the main bore head. The apparatus further includes structure for enabling the drilling access of the main bore head, during subsequent drilling of the bore hole, to become substantially aligned with the weakened region of substrate.
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Smith-Hill and Bedell
Walker Zakiya
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