Invention Grant
US07673709B2 Earth-boring bit with shear cutting elements 有权
带切割元件的钻孔钻头

Earth-boring bit with shear cutting elements
Abstract:
An earth-boring bit has a bit body and at least one cone for rotation relative to the bit body. The cone has a gage surface and a nose area separated by a central area. A nose insert is located in the nose area. The nose insert has a barrel located within a hole in the nose area and an outer end protruding from the cone, the outer end has a perimeter that is a plane perpendicular to a barrel axis of the nose insert.
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