Patent ID: 8007048

Claim:
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 convex tapered forward surface, a concave side surface, and a transition edge at an intersection of the convex forward surface and the concave 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 an axial position of the transition edge and an axial position of the axially forwardmost surface of the sidewalls are substantially the same.