Patent ID: 7635168
Filing Date: 2009-12-22
Classification: A47C,B28D,E21B,E21C

Abstract:
1. A degradation assembly comprising: a shank comprising a forward end and a rearward end, the rearward end being adapted to be retained in a holder attached to a driving mechanism; an underside of a shield rotatably connected to the forward end of the shank; the shield comprising an impact tip bonded on an end opposing the underside; the shield also comprising a carbide bolster bonded to the impact tip at the end opposing the underside; a seal disposed intermediate the shield and the shank; wherein the carbide bolster is disposed axially intermediate the impact tip and a steel portion of the shield along the assemblies central axis; wherein a first and second cylindrical bearing surface on a large and smaller diameter of the forward end respectively is separated by a non-bearing, substantially conical portion of the forward end.