Patent ID: 8141628

Claim:
A downhole deburring tool comprising: a madrel; a carriage moveable in an axial direction on the mandrel between a first position and a second position; a retractable cutter carrier having cutters on an outer surface thereof and connected to the carriage which is moveable from a first position wherein the tool has a first, smaller outside diameter to a second position in which the tool has a second, larger outside diameter; a first cam surface adjacent the cutters on the exterior surface of the carrier configured to urge the retractable carrier towards the first position when the cam surface contacts a section of reduced inside diameter in a wellbore during withdrawal of the tool from a wellbore; a housing attached to the mandrel and having an outer wall spaced apart from the mandrel which defines an annular space into which at least a portion of the cutter carrier moves when the tool is in the first position; and, a tapered surface on the inner side of the outer wall of the housing which contacts the first cam surface on the exterior surface of the carrier such that axial movement of the carrier changes the point of contact on the tapered surface.