Helical drilling apparatus, systems, and methods

Details Helical drilling apparatus, systems, and methods Helical drilling apparatus, systems, and methods

2011-08-30

2011-08-30

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Processes

C175S101000, C175S273000, C175S394000, C475S011000

Reexamination Certificate

active

08006783

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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