Drill bit and system for drilling a borehole

Details Drill bit and system for drilling a borehole Drill bit and system for drilling a borehole

2004-05-18

2008-12-16

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

Reexamination Certificate

active

07464774

ABSTRACT:
A drill bit for drilling a borehole in an object, the drill bit having a central longitudinal axis and comprising:a pilot section for drilling a pilot bore section of the borehole in the object;an under-reaming section in a following position with respect to the pilot section, the cutting diameter Duof the under-reaming section being larger than the cutting diameter Dpof the pilot section;a connecting shaft extending between the pilot section and the under-reaming section; anda stabilising section located between the pilot section and the under-reaming section, wherein the stabilising section fits inside the pilot bore section and is capable of laterally stabilising the drill bit relative to the object while allowing rotation of at least the pilot section relative to the object.

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patent: 03/004824 (2003-01-01), None
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Intl Search Report dated Nov. 12, 2004 (PCT/EP2004/050834).
Intl Preliminary Report on Patentability (PCT/EP2004/050856).

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