Metal working – Gem and jewel setting
Patent
1986-10-17
1988-06-14
Echols, P. W.
Metal working
Gem and jewel setting
408 16, 269 94, 269157, 291606, B23P 500
Patent
active
047502452
ABSTRACT:
An apparatus for mounting gemstones in prong type settings by cutting a seat in the form of an inset edge in the ends of the prongs and swaging the remaining prong material over a stone girdle, comprising a vertical support frame holding a tool driver such as a rotating chuck assembly slidably mounted thereon for sliding between first and second predetermined limits of travel. A rotary cutting tool is coupled to the tool driver for being rotated and removing predetermined portions of the prong ends. A cylindrical mandrel or vise clamp holder is mounted on a work platform attached to the frame and positions the setting under the cutting tool. The setting is held in a fixed vertical but self adjusting lateral or horizontal position which provides automatic centering of the mounting operation. A reciprocating element moves the tool driver up or down on the vertical frame with a stop being employed to control spacing between the cutting tool and the setting. A swaging element which is removably coupled to the tool driver contacts the ends of setting prongs after being cut and bends a predetermined portion of the prong ends over the girdle of the stone.
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