Drilling tool

Details Drilling tool Drilling tool

2009-11-02

2011-10-25

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

C175S344000, C175S385000, C175S386000, C175S406000

Reexamination Certificate

active

08042625

ABSTRACT:
A drilling tool has a body with a main drilling region and a pilot drilling region, eccentric to the main drilling region. The main drilling region has main blades and the pilot drilling region has pilot blades. The main drilling region has a main pass-through diameter, centered upon a first axis, one of the main blades extending to the main pass-through diameter, the pilot region having a pilot gauge diameter, centered upon a second axis of rotation at least one of the pilot blades extending to the pilot gauge diameter, wherein part of a circle of diameter equal to the pilot gauge diameter and centered upon the second axis of rotation extends outside of a circle of diameter equal to the main pass-through diameter and centered upon the first axis.

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