Apparatus and method for directional drilling of holes

Details Apparatus and method for directional drilling of holes Apparatus and method for directional drilling of holes

2005-04-19

2005-04-19

Walker, Zakiya (Department: 3672)

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

C175S090000, C175S291000

Reexamination Certificate

active

06880649

ABSTRACT:
An apparatus for the directional drilling of a 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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