Boring or penetrating the earth – Bit or bit element – With bit guide or bore wall compacting device
Reexamination Certificate
2008-08-07
2010-12-14
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Bit or bit element
With bit guide or bore wall compacting device
C175S073000
Reexamination Certificate
active
07849939
ABSTRACT:
The present invention recites a drill bit comprising a main body having an axis about which it is rotated in use, a cutting face, a connecting means for attaching the bit to a source of rotary motion, a gauge region intermediate said cutting face and the connecting means. Additionally the gauge region comprises at least one member movable between a first position in which the gauge region is bounded by an imaginary tubular surface of constant cross-section co-axial to the axis of rotation and a second position in which a portion of the member is located radially inwards, with respect to the axis of rotation, of its position when said member is in said first position. In accordance with the present invention, the gauge region whilst said member is in said second position being bound by an imaginary three dimensional conical sectional surface; and at least one actuator.
REFERENCES:
patent: 1667155 (1928-04-01), Higdon
patent: 7318492 (2008-01-01), Watson et al.
patent: 2002/0100618 (2002-08-01), Watson et al.
patent: 2007012858 (2007-02-01), None
Downton Geoffrey C.
Harmer Richard
Echols Brigitte L.
Gay Jennifer H
Loccisano Vincent
Ro Yong-Suk
Schlumberger Technology Corporation
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