Soil sampling device

Claim 1

A SOIL SAMPLING DRILL COMPRISING A DRILL SHAFT HAVING AN AXIS AND MEANS AT ONE END THEREOF FOR FRICTIONALLY SECURING SAID SHAFT INA DRILL CHUCK, AN EARTH ELEVATOR HAVING A CONTINUOUSLY EXTENDING HELICAL SURFACE GENERALLY FACING SAID ONE END AND EXTENDING LONGITUDINALLY OF SAID SHAFT FROM A POSITION ADJACENT TO SAID ONE END TO A POSITION ADJACENT TO THE OPPOSITE END OF SAID SHAFT, SAID EARTH ELEVATOR HAVING AN INNER AND OUTER BOUNDARY AND BEING COAXIALLY SECURED TO SAID SHAFT ADJACENT TO SAID INNER BOUNDARY, SAID SURFACE EXTENDING LATERALLY OF SAID SHAFT BETWEEN SAID BOUNDARIES, SAID OUTER BOUNDARY GENERALLY DEFINING THE EXTERIOR DIAMETRAL DRILL DIMENSION INTERMEDIATE THE ENDS OF SAID SHAFT, SAID EARTH ELEVATOR HAVING ADJACENT SAID OTHER SHAFT END IN END PORTION WITH A FLAT SURFACE PARALLEL TO AND SPACED FROM SAID AXIS, AND A DRILL TIP HAVING A GENERALLY PRISMATIC SHAPE INCLUDING AN APEX AND TWO GENERALLY PARALLEL BASE SURFASCES WHICH FACE IN OPPOSITE DIRECTIONS, SAID TIP BEING SECURED TO SAID SHAFT WITH SAID FLAT SURFACE ADJACENT TO ONE OF SAID BASE SURFACES, SAID AXIS WHEN EXTENDED PASSING THROUGH SAID APEX, EACH OF SAID BASE SURFACES HAVING A FLAT SURFACE PORTION AND A CURVED SURFACE PORTION, SAID FLAT SURFACE PORTIONS BEING PARALLEL AND ON OPPOSITE SIDES OF SAID AXIS, RESPECTIVELY, SAID CURVED SURFACE PORTIONG BEING CONCAVELY CURVED ABOUT AXES OF CURVATURE WHICH ARE INCLINED TO SAID AXIS AND WHICH DIVERGE FROM SAID APEX, SAID CURVED SURFACE PORTIONS BEING ON OPPOSITE SIDES OF SAID AXIS, RESPECTIVELY, SAID CURVED SURFACES BEING THE LEADING SURFACES OF SAID