Dental handpiece and collet wrench therefor

Claim 1

A TURBINE-DRIVEN DENTAL HANDPIECE COMPRISING A HEAD HOUSING, A TURBINE ROTOR ROTATABLY MOUNTED WITHIN SAID HOUSING AND HAVING A BORE EXTENDING THERETHROUGH, SAID BORE BEING TAPERED AT ONE END THEREOF AND BEING INTERNALLY THREADED AT ITS OPPOSITE END, A COLLECT CHUCK THREADEDLY MOUNTED WITHIN SAID BORE AND HAVING A PLURALITY OF FLEXIBLE JAWS ENGAGEABLE WITH THE INTERNAL SURFACES OF SAID ROTOR AT SAID TAPERED END OF SAID BORE, SAID CHUCK HAVING A FIRST BORE EXTENDING INWARDLY FROM SAID JAWS FOR RECEIVING A DENTAL BUR AND HAVING A SECOND BORE OF NONCIRCULAR CROSS SECTION EXTENDING INWARDLY FROM ITS OPPOSITE END, SAID ROTOR HAVING AT LEAST ONE SOCKET EXTENDING INWARDLY IN AN AXIAL DIRECTION FROM THE END THEREOF ADJACENT THE NON-CIRCULAR BORE OF SAID CHUCK AND SPACED LATERALLY FROM THE ROTATIONAL AXIS OF SAID ROTOR, AND OPENING MEANS IN AN END WALL OF SAID HOUSING FOR ACCESS TO SAID NONCIRCULAR BORE OF SAID CHUCK AND TO SAID SOCKET OF SAID ROTOR, WHEREBY, A WRENCH HAVING A LOCKING PIN RECEIVABLE IN SAID SOCKET AND AN INDEPENDENTLY ROTATABLE NON-CIRCULAR SHAFT RECEIVABLE IN THE NON-CIRCULAR BORE OF SAID CHUCK MAY BE COUPLED TO SAID HANDPIECE FOR ADJUSTMENT OF SAID COLLET CHUCK WITHIN SAID ROTOR.