Patent ID: 8668032
Filing Date: 2014-03-11
Classification: B28D

Abstract:
1. An abrasive core drill bit comprising: a hollow tubular body having a rotation axis and being configured to be rotated by a drill at a relatively constant rate about the rotation axis; and a plurality of teeth disposed around the periphery of a distal end of the tubular body and extending distally from the tubular body, each of the plurality of teeth supporting a drilling abrasive, wherein the abrasive core drill bit is designed to cut material primarily through abrasive action wherein the plurality of teeth rotate at the same rate as the drill, wherein the distal extension of the teeth relative to each other varies cyclically along the periphery of the distal end of the tubular body such that when the drill bit is rotated about the rotation axis and advanced along the rotation axis into a surface of a drilled material, at least one distal-most tooth maintains contact with the surface and at least one least distally extending tooth does not contact the surface.