Breaking or excavating tool with cemented tungsten carbide insert and ring

A method of manufacturing a breaking or excavating tool, the method comprising:

• forming a first seating surface at a working end of a body of the tool, the seating surface 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;
• forming a second seating surface radially outward of the cavity of the first seating surface;
• mounting an insert to the first seating surface, the insert including a tip at an axially forwardmost end, a tapered convex forward surface, a concave side surface, and a transition edge at an intersection of the convex forward surface and the concave side surface;
• and
• mounting a ring to the second seating surface, wherein the mounted ring is located radially outward of the projecting sidewalls and wherein the ring is 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.

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;
• an insert mounted within the cavity having a tip at an axially forwardmost end, a tapered convex 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 an axially forwardmost surface of the sidewalls are substantially the same;
• and
• wherein an axially rearwardmost surface of the insert is at an axial distance L from the tip of the insert, wherein an axially rearwardmost surface of the ring is at an axial distance d from the tip of the insert, and wherein d is less than L.