ANORDNING FOR JORDBORRNINGSMASKIN

摘要

ASYMMETRIC GAGE INSERT FOR AN EARTH BORING APPARATUS An asymmetric gage row insert provides a larger amount of wall contacting surface thereby decreasing the wear on the gage insert and increasing the ability of the earth boring apparatus to maintain a full gage hole. The insert has a shape prior to assembly onto the earth boring apparatus that includes a base integrally joined to an asymmetric head. The base is mounted in a socket in the earth boring apparatus. The head projects from the earth boring apparatus and includes an extended gage cutting surface. The gage cutting surface is the largest plane surface on the head. The gage cutting surface contacts the wall of the hole with the majority of the length of its extended surface and with the same angle as the gage angle of the bit. -1a-