Rotary drill bit for stone or the like

Claim 1

A ROTARY DRILL BIT FOR STONE OR THE LIKE, SAID BIT COMPRISING A SHANK FOR COUPLING SAID BIT TO A DRILL, SAID SHANK MERGING INTO AN ENLARGED HEAD HAVING A MAXIMUM TRANSVERSE DIMENSION SUBSTANTIALLY EQUAL TO THE DIAMETER OF A HOLE TO BE DRILLED BY SAID BIT AND A MINIMUM TRANSVERSE DIMENSION SUBSTANTIALLY LESS THAN SUCH DIAMETER, A PAIR OF OPPOSED, LONGITUDINALLY EXTENDING STRAIGHT FLUTES IN SAID HEAD DIVIDING THE SAME INTO OPPOSITE TRANSVERSE LOBES, THE ENDS OF SAID LOBES REMOTE FROM SAID SHANK BEING BEVELED OUTWARDLY FROM THE AXIS OF SAID HEAD, SAID HEAD HAVING A TRANSVERSE SLOT EXTENDING THROUGH SAID LOBES FROM THE POINT OF MAXIMUM TRANSVERSE DIMENSION TO THE END REMOTE FROM SAID SHANK, A HARD METAL CUTTING MEMBER SECURED IN SAID SLOT, SAID CUTTING MEMBER BEING FORMED TO PROVIDE A LONG CUTTING EDGE EXTENDING FROM THE AXIS OF SAID HEAD TO THE OUTER EDGE OF ONE LOBE, AN AXIALLY EXTENDING NOTCH IN THE OTHER LOBE AND CUTTING MEMBER EXTENDING FROM THE OUTER EDGE OF SAID OTHER LOBE INWARDLY TO A POINT SPACED FROM THE AXIS OF SAID HEAD, SAID CUTTING MEMBER BEING FORMED TO PROVIDE A SHORT CUTTING EDGE EXTENDING FROM THE AXIS OF SAID HEAD TO THE EDGE OF SAID NOTCH, WHEREBY UPON ROTATION OF SAID BIT THE UNEQUAL LOAD RESULTING FROM SAID LONG AND SHORT CUTTING EDGES WILL CAUSE SAID BIT TO WOBBLE, THEREBY REMOVING STONE OR THE LIKE IN THE FORM OF RELATIVELY LARGE PARTICLES.