US 5,293,858 AGranted

Apparatus and method for cone shaping the crown and pavilion of gemstones

OwnerNizam U. Petersinventor

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Abstract

Apparatus and methods for simultaneously cone cutting of crown portions and pavilions of gemstones are provided by the present invention. Each of the gemstones to be simultaneously cut are individually mounted in a motor rotating collet which is mounted on a base plate. One of the base plates is provided with additional motor-driven apparatus to move the plate at an angle of approximately 45.degree. to the axial center line of the gemstone. The second gemstone is rotated by a motor attached to the collet by a support plate. The support plate moves in a direction toward the first gemstone at an angle approximately 45.degree. to the axial center line of the second gemstone and, such that, it is perpendicular to the back and forth motion provided by the motor apparatus of the first gemstone. In this manner, each of the gemstones are simultaneously coned shaped at first its crown portion and then at its pavilion portion or visa versa.

An apparatus for shaping first and second diamonds, each having a girdle, comprising:

a first pair of fixed elongated guide tracks disposed in parallel relation to one another in a horizontal plane;
a plane base plate operatively associated with said first guide tracks having two side edges and two ends, the ends of said first base plate slidable between a first and a second position along said first guide tracks;
means for oscillating said first base plate between said first pair of guide tracks;
at least one first elongated rotatable clamping device coupled to said first base plate, said first clamping device arcuately rotatable along a first arcuate guide track;
first means for locking said first clamping device about a first arcuate guide track for locking said first clamping device in a predetermined position;
at least one means for grasping the girdle of a first rough diamond operatively associated with said first clamping device;
a second pair of fixed elongated guide tracks disposed in parallel relation to one another in a horizontal plane perpendicular to said first pair of tracks;
a second base plate operatively associated with said second guide tracks having two side edges and two ends, the ends of said second base plate slidable between a first and a second position along said second guide tracks;
means for micro-adjustment of said second base plate between the first and second position of said second guide tracks;
at least one second elongated rotatable clamping device coupled to said second base plate, said second clamping device arcuately rotatable along a second arcuate guide track;
second means for locking said second clamping device about said second arcuate guide track for locking said second clamping device in a predetermined position;
and
at least one second means for grasping the girdle of a second rough diamond operatively associated with said second clamping device;
whereby said first and second diamonds are rotatably contacted together for purposes of simultaneous cone formation.

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Abstract

Claims1