Machine for grinding and polishing facets of precious stones

Claim 1

IN A MACHINE FOR GRINDING AND POLISHING THE FACETS OF A PRECIOUS STONE, A MAIN BODY MOUNTED ON A BASE, A VERTICAL SHAFT JOURNALLED IN SAID MAIN BODY, A UNIVERSAL SWIVEL BLOCK PIVOTALLY MOUNTED ON SAID VERTICAL SHAFT, A HORIZONTAL SHAFT MOUNTED IN THE FORWARD PART OF SAID SWIVEL BLOCK, A TWO ARM FORK PIVOTALLY MOUNTED UPON THE ENDS OF SAID HORIZONTAL SHAFT, A CYLINDRICAL HOUSING CARRIED BY THE FORWARD PORTION OF SAID FORK, AND A PRECIOUS STONEHOLDING DOP STICK ADJUSTABLY SECURED WITHIN SAID HOUSING, FOR PERMITTING ANY DESIRED FACET OF SAID PRECIOUS STONE TO BE HELD MANUALLY AGAINST A HORIZONTAL GRINDING WHEEL LOCATED BENEATH IT, SAID FORK CARRYING A SMALL INCLINED SHAFT IN ALIGNMENT WITH AND BEHIND SAID DOP STICK, A CIRCULAR INDEXING PLATE SECURED AT RIGHT ANGLES ON THE REAR END OF SAID SMALL SHAFT AND PROVIDED WITH A ROW OF SPACED HOLES AT ITS PERIMETER, AND A SPRING-PRESSED SLIDING PIN MOUNTED IN SAID FORK FOR SELECTIVELY ENGAGING WITHIN ANY ONE OF SAID HOLES, SAID SPRING-PRESSED SLIDING PIN BEING PARALLEL TO SAID SMALL SHAFT.