A barrena to remove nucleos. (Machine-translation by Google Translate, not legally binding)

摘要

An auger for removing cores having a cylindrical diamond shoe for cutting the bottom of a bore hole to define a core, characterized in that the radial thickness of the shoe is less than the radial thickness of the annular duct to be cut , the shoe being formed with recesses where rotary bearing cone cutters are supported by the auger to remove cores, the cutters projecting from the shoe to cut the rest of the annular conduit not cut by means of the shoe and having its internal ends truncated and placed inside the recesses. (Machine-translation by Google Translate, not legally binding)