Patent ID: 7810207

Claim:
An assembly of at least one inner tubular member displaceable in an outer tubular member, a surface of the inner tubular member being made of a hardened material, comprising: at least one blade having a sharp cutting edge, said blade being mounted between said inner tubular member and said outer tubular member, and said blade being made in a hardened material able to cut away cooked contaminants and defects of the hardened material of said inner tubular member while maintaining a surface finish of the inner tubular member; and a compressive joint, said compressive joint supporting said at least one blade in contact with said surface of said inner tubular member; wherein said at least one blade contacts said surface at an angle and exerts thereon a pressure of at least 10 lb/in 2 , said angle and said pressure being adjustable through said compressive joint, and said at least one blade thoroughly cleaning the surface of the inner tubular member.