Drill bit including one piece cutting head

Details Drill bit including one piece cutting head Drill bit including one piece cutting head

2011-01-04

2011-01-04

Bomar, Shane (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S415000

Reexamination Certificate

active

07861807

ABSTRACT:
A cutting head for a drill bit has a body with an overall cruciform shape. One pair of opposing arms defines a main cutting edge. The other pair of opposing arms defines an auxiliary edge. The main cutting edge is defined by rake surfaces and relief surfaces. Each rake surface and relief surface is defined by a plurality of facets. The main cutting edge includes a chisel edge. A first pair of planar rake facets, one on each end of said chisel edge, and a first pair of planar relief facets, adjacent said chisel edge, defines a portion of the cutting edge. A remaining portion of the main cutting edge is defined at the apex of a plurality of curved rake facets and curved relief facets. The auxiliary edge is defined by a plurality of curved surfaces.

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