Gemstone drill

Details Gemstone drill Gemstone drill

1976-03-29

1978-02-28

Whitehead, Harold D.

Stone working

Precious stone working

408 15, 408127, B28D 500

Patent

active

040760073

ABSTRACT:
A depressed drill assembly and vibratory work piece support for abrasive cutting in a zone immersed in liquid with or without abrasive grit, wherein vertically disposed excursions aligned with the gravitational axis of the drill assembly intermittently lifts the latter for access and entry of said grit and/or liquid into the cutting zone intermediate the drill and work piece, whereby holes are accurately cut through gemstones and the like.

REFERENCES:
patent: 1722992 (1929-08-01), Bertrand
patent: 2398250 (1946-04-01), Robbins
patent: 2402831 (1946-06-01), Moses
patent: 2474800 (1949-06-01), Nill
patent: 2622581 (1952-12-01), Peters
patent: 2792883 (1957-05-01), Pokorski
patent: 2906144 (1959-09-01), McManis
patent: 2942383 (1960-06-01), Brown
patent: 3350817 (1967-11-01), Kiso
patent: 3447528 (1969-06-01), Annen

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