Patent ID: 7861807
Filing Date: 2011-01-04
Classification: B23B,B28D,E21B,Y10T

Abstract:
1. A cutting head comprising: a body having an overall cruciform shape, one pair of opposing arms defining a main cutting edge and another pair of opposing arms defining an auxiliary surface, said main cutting edge defined by rake surfaces and relief surfaces, each rake surface and relief surface defined by a plurality of facets, said main cutting edge including a chisel edge, a first pair of planar rake facets are positioned, one on each end of said chisel edge, a first pair of planar relief facets are adjacent said chisel edge and define a portion of the cutting edge with said pair of planar rake facets, a remaining portion of the main cutting edge defined by a plurality of curved rake facets and curved relief facets and said auxiliary surface defined by a plurality of curved surfaces, wherein said plurality of curved rake facets include at least one convex rake facet.