Vibratory type apparatus for use in rotary drilling of boreholes

Claim 1

IN A SWIVEL FOR USE IN ROTARY DRILLING WHICH INCLUDES A HOUSING, A MEANS SECURED TO THE HOUSING FOR SUSPENDING THE SWIVEL FROM A TRAVELING BLOCK, A MEANS FOR CONDUCTING DRILLING FLUID INTO THE SWIVEL, AND A STEM ROTATABLY SECURED WITHIN SAID HOUSING IN FLUID COMMUNICATION WITH SAID DRILLING FLUID CONDUCTING MEANS AND EXTENDING BELOW SAID HOUSING TO SUPPORT A KELLY, THE IMPROVEMENT WHICH COMPRISES: (A) A LOWER BEARING PLATE SECURED WITHIN SAID HOUSING AROUND SAID STEM; (B) A PLURALITY OF BEARINGS POSITIONED ON SAID LOWER BEARING PLATE; AND (C) A THRUST BLOCK SECURED TO THE UPPER END OF SAID STEM AND ROTATABLE THEREWITH, RELATIVE TO SAID LOWER BEARING PLATE, THE LOWER FACE OF SAID THRUST BLOCK RESTING ON SAID BEARING TO SUPPORT SAID STEM WITHIN SAID HOUSING, SAID LOWER FACE OF SAID THRUST BLOCK HAVING A CAM SURFACE COOPERATING WITH SAID BEARINGS TO CAUSE SAID STEM TO RECIPROCATE LONGITUDINALLY IN ACCORDANCE WITH THE CONFIGURATION OF SAID CAM SURFACE SIMULTANEOUSLY WITH THE ROTATION OF SAID DRILL STEM.