Drill bit

Details Drill bit Drill bit

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

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