Rotating guide boring bar

Claim 1

A BORING DEVICE INCLUDING A STATIONARY BORING BAR COMPRISING A SHAFT HAVING A FORWARD END AND A REARWARD END, MEANS AT SAID REARWARD END MOUNTING SAID SHAFT COAXIALLY WITH A ROTATIONALLY DRIVEN WORK PIECE TO BE BORED, A CUTTER HEAD CARRIED BY THE FORWARD END OF SAID SHAFT, A SLEEVE ROTATABLY MOUNTED ON SAID SHAFT REARWARDLY OF SAID CUTTER HEAD, A CIRCUMFERENTIAL SERIES OF GUIDE MEMBERS MOUNTED ON SAID SLEEVE COEXTENSIVE IN LENGTH THEREWITH AND COMPRISING FORWARDLY AND REARWARDLY EXTENDING FLEXIBLE ARM PORTIONS, ELONGATED FLEXIBLE GUIDE PADS SECURED TO THE FORWARD AND REARWARD ENDS OF SAID ARM PORTIONS FOR FRICTIONAL ENGAGEMENT WITH THE BORED DIAMETER OF THE WORK PIECE AND IN SLIDABLE LINEAL FRICTIONAL CONTACT THEREWITH AS THE BORING OPERATION PROGRESSES, A PLURALITY OF RADIALLY DISPOSED CUTTER TOOLS CARRIED BY THE CUTTER HEAD, ROTATABLE MEANS CARRIED BY THE CUTTER HEAD FOR RADIALLY EXTENDING SAID CUTTER TOOLS RELATIVE TO THE CUTTER HEAD PREPARATORY TO STARTING THE BORING OPERATION AND FOR RETRACING SAID CUTTER TOOLS RELATIVE TO THE BORED DIAMETER OF THE WORK PIECE AT THE END OF THE BORING OPERATION, SAID ROTATABLE MEANS COMPRISING A HOLLOW THREADEDLY ROTATABLE SHAFT EXTENDING INTO THE CUTTER HEAD PROVIDED AT ITS OUTER END WITH A MICROMETRIC HEAD AND AT ITS INNER END WITH CAM MEANS, RESILIENT MEANS CARRIED BY SAID CUTTER HEAD ENGAGED WITH SAID CUTTER TOOLS AND AT ALL TIMES MAINTAINING THE INNER ENDS OF SAID CUTTER TOOLS IN INTIMATE CONTACT WITH SAID CAM MEANS WHEREBY ROTATION OF SAID HOLLOW SHAFT AND CAM MEANS IN ONE DIRECTION WILL EXTEND THE CUTTER TOOLS RELATIVE TO THE CUTTER HEAD AND ROTATION IN AN OPPOSITE DIRECTION WILL RETRACT SAID CUTTER TOOLS, AND LOCKING MEANS EXTENDING THROUGH SAID HOLLOW SHAFT AND INTO SAID BORING BAR FOR LOCKING SAID HOLLOW SHAFT AND CAM MEANS AGAINST ROTATION IN EITHER DIRECTION.