Principles and appliances for the cutting of spherical-faceted g

Details Principles and appliances for the cutting of spherical-faceted g Principles and appliances for the cutting of spherical-faceted g

1987-06-09

1991-04-02

Dorner, Kenneth J.

Jewelry

Gem

A44C 1700

Patent

active

050037919

ABSTRACT:
An introductory outline expounds the visual effects produced when gems are cut with spherical facets, rather than with the conventionally flat ones. An indication follows of some kinematic principles and devices which enable the manufacture of this type of facet. In particular, sphere-shaped abrasive covers or bowls are foreseen on which will be fixed the gem-carrying terminal of a conventional tripodal faceter whose two other terminals of support are guided in such a way as to make gem-carrying terminal (C) describe a sphere, maintaining a constant angle between the axis of the gem and the normal to the abrasive cover at the point of contact.

REFERENCES:
patent: 946939 (1910-01-01), Gonard
patent: 1987357 (1935-01-01), Bergen et al.
patent: 3286486 (1966-11-01), Huisman et al.
patent: 3875760 (1975-04-01), Jones

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