Earth-boring bit with negative offset and inverted gage cutting

Details Earth-boring bit with negative offset and inverted gage cutting Earth-boring bit with negative offset and inverted gage cutting

1995-09-13

1997-12-09

Taylor, Dennis L.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175374, 175353, F21B 936

Patent

active

056950187

ABSTRACT:
An earth-boring bit has a bit body and at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a gage surface and an adjacent cutter backface. The cutter has negative offset with respect to the axis and direction of rotation of the bit. A plurality of cutting elements are arranged on the cutter including a plurality of gage cutting elements on the gage surface of the cutter. At least one of the gage cutting elements projects beyond the gage surface and defines a cutting surface facing the backface of the cutter for engaging the sidewall of the borehole being drilled as the gage cutting element moves up the sidewall.

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