Patent ID: 8215719
Filing Date: 2012-07-10
Classification: E21C

Abstract:
1. A rotatable cutting tool for use in impinging earth strata, the rotatable cutting tool comprising: a cutting tool body; a hard tip affixed to the cutting tool body; the cutting tool body having an axial forward end for receiving the hard tip and an axial rearward end, a head portion axially rearward of the axial forward end, a collar portion axially rearward of the head portion, and a shank portion axially rearward of the collar portion and axially forward of the axial rearward end; the head portion including a base portion affixed to the collar portion and a nose portion movably connected to the base portion, wherein the base portion defines a pocket for receiving at least a part of the nose portion; the cutting tool body defining an internal coolant channel extending axially from the axial rearward end through the shank portion, the collar portion and at least part of the base portion of the head portion, wherein the nose portion of the head portion is positioned adjacent to the internal coolant channel that extends through the base portion of the head portion; and a mounting clip attached to the nose portion and a groove formed in the base portion circumferentially about the pocket, wherein the mounting clip cooperates with the groove to provide the movable connection between the nose portion and the base portion.