Earth boring bit

Details Earth boring bit Earth boring bit

2011-02-08

2011-02-08

Neuder, William P (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

C175S413000

Reexamination Certificate

active

07882907

ABSTRACT:
The earth boring bit10is designed to bore an angular non-vertical hole into underlying strata. The bit10includes a plurality of steeply inclined cutting faces or edges22that define a relatively narrow included angle A therebetween. The bit's design ensures that the apex of the bit10will contact the surface S and/or other hard strata before the radially outwardly disposed gauge portion of the bit10.This design reduces or obviates drill chattering or “walking” when the bit10is used to drill a hole at an angle that is not vertical relative to the surface or strata S. The bit10also includes an interchangeable flow control restrictor that optimizes the velocity of fluid pumped through the bit10and thus efficiently flushes debris from the hole as the hole is being drilled.

REFERENCES:
patent: 2044303 (1936-06-01), Howard
patent: 4386422 (1983-05-01), Mumby et al.
patent: 5735360 (1998-04-01), Engstrom
patent: 5880382 (1999-03-01), Fang et al.
patent: 6918455 (2005-07-01), Meyers et al.
patent: 2005/0145417 (2005-07-01), Radford et al.
patent: 2009/0057030 (2009-03-01), Didericksen et al.

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