Cutting bit and bit holder

摘要

A cutting bit for use in a heavy-duty mining, drilling or milling operation includes a generally conical body, a first end of which presents a cutting point and a second end of which presents an axially extending recess. The body has a generally convex surface portion. Locking means releasably and rotatably connect the cutting bit to a protruding part of a bit holder. The recess has an entrance portion presenting a generally conical surface portion. A corresponding bit holder is presented as well as a system using the cutting bit and bit holder.

主权项

1. A single tip cutting bit for use in a heavy-duty mining, drilling or milling operation, comprisinga generally conical body, a first end of which forming a cutting point and a second end of which forming an axially extending recess, the body having locking means for releasably and rotatably connecting the cutting bit to a protruding part of a bit holder, and a generally convex surface portion starting at the locking means and extending towards an entrance portion of the recess at the second end, wherein the entrance portion at a lowermost part of the recess forms a generally conical surface portion and the generally convex surface portion has an axially rounded convex surface, a radius of the convex surface portion being greater than or equal to ¼ of a distance from a base of the conical body to an innermost portion of the locking means.