Rotary impact mechanism

Claim 1

AN IMPROVED IMPACT MECHANISM FOR USE IN ROTARY IMPACT TOOLS AND ADAPTED TO BE ROTABLY DRIVEN BY A PRIME MOVER TO DELIVER TORQUE IMPACT TO A DRIVEN TOOL ELEMENT COMPRISING IN COMBINATION, A ROTATABLY SUPPORTED HAMMER FRAME HAVING DRIVING CONNECTION WITH THE PRIMER MOVER AND FORMED WTIH AN AXIAL CUP BORE OPENING CENTRALLY INWARDLY OF ITS ONE END AND INCLUDING DIAMETRICALLY OPPOSED RECESSES IN ITS ONE END, HAMMER MEANS HAVING RADIALLY EXTENDING ARM PORTIONS, EACH WITH A STRIKING SEGMENT, NESTED IN THE SAID RECESSES OF THE HAMMER FRAME FOR COAXIAL ROTATION THEREWITH, A SPINDLE MEMBER EXTENDING COAXIALLY INTO SAID CUP BORE AND THROUGH SAID HAMMER MEANS AND HAVINE ONE END PORTION PROJECTING AXIALLY OUTWARDLY OF SAID HAMMER FRAME AND HAMMER MEANS ANVIL MEANS MOUNTED ON THE SAID ONE END PORTION OF SAID SPINDLE MEANS FOR CONNECTION WITH TOOL ELEMENTS TO BE DRIVEN AND INCLUDING RADIALLY EXTENDING ARM PORTIONS DISPOSED ADJACENT SAID HAMMER MEANS AND PRESENTING STRIKING SURFACES FOR IMPACT ENGAGEMENT BY THE SAID STRIKING SEGMENTS OF SAID HAMMER MEANS, SPRING MEANS NORMALLY BIASING SAID HAMMER MEAN AXIALLY AWAY FROM SAID ANVIL MEANS, AND CAM MEANS MOUNTED BETWEEN THE BOTTOM OF SAID CUP BORE AND SAID HAMMER AND COMPRISING A PLURALITY OF ANNULAR CAM ELEMTNTS ARRANGED CONCENTRICALLY OF SAID SPINDLE MEANS AND INCLUDING COOPERATING CAM PORTIONS FOR EFFECTING PERIODIC AXIAL DISPLACEMENT OF CERTAIN OF SAID ELEMTNTS AND SAID HAMMER MEANS AGAINST THE FORCE OF SAID SPRING MEANS IN RESPONSE TO PREDETERMINED RELATIVE ROTATION BETWEEN SAID CAM ELEMENTS, LOST MOTION CONNECTOR MEANS CONNECTING ONE OF SAID CAM ELEMENTS TO SAID HAMMER MEANS FOR PERIODIC RELATIVE AND CONJOINT ROTATIONAL MOVEMENT THEREWITH AND MEANS POSITIVELY CONNECTING ANOTHER OF SAID CAM ELEMENTS TO SAID SPINDLE MEANS FOR CONJOINT ROTATIONAL MOVEMENT THEREWITH THEREBY TO EFFECT THE SAID RELATIVE ROTATION.