Patent ID: 6149354
Filing Date: 2000-11-21
Classification: B23C,Y10T

Abstract:
A tool for cutting a seat in the setting of jewelry for receiving a gemstone, said gemstone having a crown, a girdle, and a pavilion, the tool comprising a cylindrical shank portion and a bur cutting portion attached to said shank portion at one end for conjoint rotation therewith, said bur cutting portion having Cutting surfaces disposed for rotation about a longitudinal axis of the shank portion, said bur cutting portion including first and second generally conical cutting surfaces and a generally cylindrical cutting surface located between the first and second cutting surfaces, the first cutting surface extending radially inward from the generally cylindrical surface toward the longitudinal axis of the shank portion and generally forming an acute angle with respect to a reference plane extending transversely to the longitudinal axis of the shank portion through the generally cylindrical cutting surface, the second cutting surface extending radially inward from the generally cylindrical surface toward the longitudinal axis of the shank portion and generally forming an acute angle with respect to said reference plane, said angle generally formed by the first cutting surface being substantially greater than said angle generally formed by the second cutting surface, the cutting surfaces each being constructed to cut into the setting of the jewelry upon rotation of the tool about the longitudinal axis of the shank portion to form the seat in the setting.