Core sample apparatus

Claim 1

CORE TAKING APPARATUS COMPRISING A DRILL STEM, MEANS FOR ROTATING SAID DRILL STEM, MEANS FOR EXERTING A CONSTANT DOWNWARD FORCE ON SAID DRILL STEM, CASING MEANS FIXEDLY MOUNTED ON THE LOWER END OF SAID DRILL STEM SO AS TO ROTATE THEREWITH, AN ANVIL RECIPROCABLY RECEIVED IN SAID CASING MEANS, MEANS DISPOSED BETWEEN SAID ANVIL AND SAID CASING MEANS TO PREVENT RELATIVE ROTATION THEREBETWEEN AIR-PRESSURE-OPERATED MEANS IN SAID CASING INCLUDING A HAMMER FOR REPEATEDLY STRIKING AND HAMMERING SAID ANVIL DOWNWARDLY, MEANS FOR SUPPLYING AIR PRESSURE THROUGH SAID DRILL STEM TO SAID AIR-PRESSURE-OPERATED MEANS, A HOLLOW CYLINDRICAL CORE BARREL HEAD FIXED TO SAID ANVIL, PASSAGE MEANS IN SAID ANVIL SO THAT AIR FROM SAID SUPPLY MEANS ACTUATING SAID HAMMER MAY EXIT THROUGH SAID ANVIL, AN OUTER TUBE FIXED TO AND SURROUNDING SAID CORE BARREL HEAD, AN INNER TUBE ROTATABLY SECURED TO SAID CORE BARREL HEAD AND RECEIVED WITHIN SAID OUTER TUBE, A DRILL BIT CARRYING HEAD SECURED TO THE DISTAL END OF SAID OUTER TUBE AND HAVING A CENTRAL OPENING IN REGISTRY WITH SAID INNER TUBE.