Pivotal work holding device for grinding gemstones

Details Pivotal work holding device for grinding gemstones Pivotal work holding device for grinding gemstones

1979-12-17

1981-03-10

Whitehead, Harold D.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51124R, B24B 916

Patent

active

042545870

ABSTRACT:
This invention is a work holding device that holds a stone in contact with an abrading surface for grinding of the stone.
The stone is continuously moved across the face of the abrading surface in an arcuate path to expose the stone to fresh abrading surface and to avoid grooving of the abrading surface as would occur if the stone was held in a stationary position.
A dop-holding tong is held on a platform. The platform is pivotally mounted on a base and the platform is rotated in an alternating direction by a motor driven crank-slide that provides movement to the platform and the stone bearing dop.

REFERENCES:
patent: 231577 (1880-08-01), Hessels
patent: 1575156 (1926-03-01), Ecaybert
patent: 2368108 (1945-01-01), Bourgeois
patent: 2398628 (1946-04-01), Dykoski
patent: 2527592 (1950-10-01), Spira
patent: 3020680 (1962-02-01), Soderman

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