Shock cushioning rotary driving well tool

Claim 1

A SHOCK CUSHIONING ROTARY DRIVING WELL TOOL COMPRISING TELESCOPICALLY ENGAGED RELATIVELY AXIALLY MOVABLE AND RELATIVELY ROTATABLE TUBULAR DRIVING AND DRIVEN MEMBERS HAVING AN ANNULAR SPACE BETWEEN THEM AND A PLURALITY OF SEALING MEANS, EACH SEALING MEANS BEING ON ONE OF SAID MEMEBRS AND ROTATABLY SLIDABLY SEALINGLY ENGAGING THE OTHER, AND SAID SEALING MEANS CLOSING THE OPPOSITE ENDS OF SAID ANNULAR SPACE TO FORM A CLOSED CHAMBER OF VOLUME VARIABLE UPON RELATIVE AXIAL MOVEMENT OF SAID MEMBERS, SAID RESPECTIVE MEMBERS HAVING OPPOSED CLOSELY SPACED SURFACES BOTH EXPOSED AND FACING EACH OTHER WITHIN SAID CHAMBER, AND A LIQUID FILLING SAID CHAMBER INCLUDING THE SPACE BETWEEN SAID SURFACES, THE VISCOSITY OF SAID LIQUID AND THE SPACING BETWEEN SAID SURFACES BEING SO RELATED THAT SAID LIQUID WILL PROVIDE A FLUID COUPLING BETWEEN SAID MEMBERS WHEREBY ROTATION OF ONE OF SAID MEMBERS WILL IMPART A TORQUE TO THE OTHER THROUGH SAID FLUID COUPLING AND RELATIVE AXIAL MOVEMENT OF SAID MEMBERS WILL VARY THE PRESSURE IN SAID LIQUID AND THE TORQUE CAPACITY OF SAID FLUID COUPLING.