Sonic earth boring drill with jacket

Claim 1

IN A HIGH ENERGY SONIC WELL DRILL ADAPTED FOR ATTACHMENT TO A DRILL STRING AND HAVING AN ELASTICALLY COMPLIANT VERTICAL COLUMN OF HEAVY CROSS SECTION, A PERIODIC FORCE GENERATING OSCILLATOR COUPLED TO SAID COLUMN FOR EXERTING A VERTICALLY DIRECTED ALTERNATING FORCE THEREON AT A LONGITUDINAL RESONANT FREQUENCY OF THE COLUMN TO GENERATE A LONGITUDINAL STANDING WAVE IN THE COLUMN, WITH A VELOCITY ANTINODE AT EACH END OF THE COLUMN AND A STRESS ANTINODE AT AN INTERMEDIATE REGION THEREOF, AND A BIT CONNECTED TO THE LOWER END OF THE COLUMN, THE COMBINATION THEREWITH OF IMPROVEMENTS FOR DRILLING WITHOUT SUBSTANTIAL VIBRATION OF THE DRILL STRING AND FOR SUPPRESSION OF PARASITIC LATERAL VIBRATION OF SAID COLUMN DERIVED FROM SAID LONGITUDINAL STANDING WAVE THEREIN COMPRISING AN ELONGATED JACKET STRUCTURE ATTACHED AT ITS UPPER END TO THE DRILL STRING AND CONCENTRICALLY SURROUNDING AND EXTENDING DOWNWARDLY ALONG AN UPPER SECTION OF SAID COLUMN AT A PREDETERMINED AND FIXED SLIGHT CLEARANCE THEREFROM WHICH IS LESS THAN THE HALF-AMPLITUDE OF PARASITIC LATERAL VIBRATION TENDING TO BE SET UP IN SAID COLUMN, WHEREBY TO EFFECT LATERAL COLLISION BETWEEN THE LATERALLY VIBRATING COLUMN AND THE JACKET STRUCTURE, AND MEANS CONNECTING SAID JACKET STRUCTURE TO SAID COLUMN AT A DISTANCE DOWNWARDLY FROM THE VELOCITY ANTINODE AT THE UPPER END OF THE COLUMN EQUAL TO AT LEAST AN EIGTH WAVE LENTH DISTANCE ALONG THE COLUMN FOR THE LONGITUDINAL STANDING WAVE THEREIN, SAID BIT BEING OF LARGER DIAMETER THAN SAID JACKET STRUCTURE SO AS TO PROVIDE FOR ACCOMMODATION OF THE JACKET STRUCTURE IN THE WELL BORE.