Patent ID: 6869257
Filing Date: 2005-03-22
Classification: B23B,Y10T

Abstract:
1. A tool for shaving burrs and rough portions from a hole edge of a borehole formed through a workpiece while preventing substantially any chamfer to the hole edge of the borehole, the tool comprising: a shaft having a first axis; a cutter pivotally mounted on the shaft to rotate about a second axis substantially orthogonal to the first axis, the cutter having a cutting edge and a workpiece-engaging portion; and a mechanism to spring-load the cutter so that the cutter is normally held in a substantially vertical position and the cutter controllably rotates about the second axis from the substantially vertical position in a first direction upon engagement of the workpiece-engaging portion with the workpiece during movement of the cutter along the first axis wherein the workpiece-engaging portion substantially prevents the cutting edge from chamfering the hole edge and wherein during further movement of the cutter along the first axis in the borehole the cutter further controllably rotates about the second axis in the first direction to expose the cutting edge so that the cutting edge shaves burrs and rough portions from the hole edge of the borehole and wherein during still further movement of the cutter along the first axis in the borehole, the cutter still further controllably rotates about the second axis in the first direction until the cutter rotates into a retracted position within the shaft and wherein the mechanism includes at least one spring within the shaft for spring-loading the cutter along the first axis and wherein the mechanism further includes at least one pin for engaging the cutter within the shaft and wherein the at least one pin is spring-loaded by the at least one spring.