Patent ID: 8007049
Filing Date: 2011-08-30
Classification: B28D,E21C

Abstract:
1. A breaking or excavating tool, comprising: a body having a mounting end and a working end; a seating surface at the working end including a cavity and axially projecting sidewalls formed integral to the body, the sidewalls having an axially forwardmost surface oriented perpendicular to an axis of the tool adjoining a radially outermost surface oriented parallel to the axis of the tool; an insert mounted within the cavity having a tip at an axially forwardmost end, a tapered forward surface, a side surface and a transition edge at an intersection of the forward surface and the side surface; and a ring located radially outward of the projecting sidewalls, the ring formed of a material harder than the body of the tool, wherein the transition edge and an axially forwardmost surface of each of the sidewalls and the ring are arranged in an axially rearwardly extending stepped configuration; wherein the axially forwardmost surface of the ring is at an axial distance D from the tip of the insert and an axially rearwardmost surface of the ring is at an axial distance d from the tip of the insert; and wherein in the interval D to d, the ring is the radially outermost portion of the tool.