Cutting element having enhanced cutting geometry

Details Cutting element having enhanced cutting geometry Cutting element having enhanced cutting geometry

2006-08-08

2006-08-08

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S426000

Reexamination Certificate

active

07086488

ABSTRACT:
A drill bit that includes a bit body, at least one roller cone attached to the bit body and able to rotate with respect to the bit body, a plurality of cutting elements disposed on the at least one roller cone, and a barrel axis is disclosed. At least one of the plurality of cutting elements includes a first area defining a secondary wear surface, wherein the first area is formed as a convex surface on the trailing edge, a second area proximate the first area defining a main wear surface, wherein the second area is formed as a convex curved surface having a radius of curvature substantially equal to a radius of a borehole, and a third area defining a spherical cutting surface. Further, at least one of the plurality of cutting elements includes a non-spherical transition zone disposed between the third area and the first and second areas, wherein the barrel axis intersects the transition zone.

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Official Action issued in corresponding Canadian Appl. No. 2,447,747; Dated Feb. 3, 2006; 2 pages.

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