Patent ID: 7837277
Filing Date: 2010-11-23
Classification: E21C

Abstract:
1. A cutting pick, comprising: an elongate shank; a cutting tip mounted to one end of the shank to project from said one end, the cutting tip having a leading end, a trailing end and a mounting portion for mounting to the shank, the mounting portion being disposed adjacent said trailing end and opposite to the leading end, the tip having a shape such that it diverges outwardly in a direction from the leading end to the trailing end to a portion of maximum diameter; an annular sleeve having an inner diameter and being attached about the shank adjacent to and in non-contacting relationship with the trailing end of the cutting tip, wherein the portion of maximum diameter of the cutting tip is of greater diameter than a diameter of the inner diameter of the annular sleeve so that the portion of maximum diameter overlies the sleeve radially; and wherein the shank defines a shoulder which extends substantially perpendicular to a lengthwise axis of the shank between a generally conical section and a cylindrical section, the conical section converging towards the cylindrical section and the cylindrical section defining a recess for receipt of the mounting portion of the cutting tip, the annular sleeve being attached to the shank about the cylindrical section and being supported on the shoulder, wherein the annular sleeve includes a planar outer surface and a corner closest to the cutting tip that is bevelled such that the outer diameter of the annular sleeve is reduced at the portion closest to the cutting tip.