Cutter shank tightener

Claim 1

THE COMBINATION OF, A HOLLOW ROTARY SPINDLE HAVING AN OUTWARDLY OPENING RECESS IN ONE END, A SHANK FITTING INTO SAID RECESS AND PROJECTING BEYOND THE END OF SAID SPINDLE TO SUPPORT A CUTTER, A HOLE IN SAID SPINDLE EXTENDING INWARDLY ALONG THE SPINDLE AXIS WHILE CONVERGING TOWARD THE AXIS WITH ITS INNER END INTERSECTING SAID RECESS SHORT OF THE INNER END THEREOF, AN ANNULAR GROOVE AROUND THE SAID SHANK SHORT OF THE INNER END THEREOF AND IN THE PLANE OF THE INNER END OF SAID HOLE, SAID GROOVE BEING DEFINED BY AXIALLY SPACED AND OPPOSITELY FACING FIRST AND SECOND WALLS, A ROD JOURNALED IN AND SLIDABLE ALONG SAID HOLE, A HEAD ON THE INNER END OF SAID ROD HAVING OPPOSITELY AND AXIALLY FACING ANNULAR END SURFACES WITH ARCUATE SIDE PORTIONS THEREOF PROJECTING WITHIN SAID GROOVE FOR ABUTMENT WITH SAID FIRST AND SECOND WALLS, SAID END SURFACES BEING AXIALLY SPACED APART A DISTANCE SOMEWHAT LESS THAN SAID GROOVE WALLS, AND MEANS COUPLING THE OUTER ENDS OF SAID ROD AND SPINDLE AND SELECTIVELY OPERABLE TO ADVANCE SAID ROD AND PUSH ONE END SURFACE OF SAID HEAD AGAINST SAID FIRST WALL TO DRAW SAID SHANK INWARDLY OR ALTERNATIVELY RETRACT THE ROD TO PULL THE OTHER END SURFACE OF SAID HEAD AGAINST SAID SECOND WALL AND PULL THE SHANK OUTWARDLY RELATIVE TO THE SPINDLE.