Recessing tool holder

Claim 1

A TOOL HOLDER COMPRISING A BODY MEMBER HAVING A BORE EXTENDING THERETHROUGH HAVING EXTERNAL THREADS LOCATED CENTRALLY THEREOF, A DOVETAIL SLOT EXTENDING ACROSS ONE END SAID BORE, A DOVETAIL SLIDE POSITIONED IN SAID DOVETAIL SLOT INCLUDING AN INCLINED AXIALLY EXTENDING RECESS IN THE BOTTOM THEREOF IN COMMUNICATION WITH SAID BORE EXTENDING THROUGH SAID BODY MEMBER, A PILOT BAR EXTENDING INTO THE OTHER END OF SAID BORE HAVING AN INCLINED KEY ON THE END THEREOF EXTENDING INTO SAID INCLINED RECESS FOR PRODUCING MOVEMENT OF SAID SLIDE TRANSVERSELY OF SAID BORE ON RELATIVE MOVEMENT OF SAID BODY MEMBER AND PILOT BAR AXIALLY OF SAID BORE, AN ADJUSTABLE ABUTMENT MEANS SECURED TO SAID BODY MEMBER FOR ACCURATELY LOCATING THE TOOL WITH RESPECT TO AN OPENING IN A WORKPIECE BOTH RADIALLY AND AXIALLY COMPRISING AN ANNULAR BEARING COLLAR THREADEDLY ENGAGED WITH THE THREADS ON THE EXTERIOR OF THE BODY MEMBER FOR MOVEMENT AXIALLY THEREOF, AN ANNULAR THRUST BEARING SLEEVED OVER THE BODY MEMBER AND POSITIONED WITHIN THE RECESS IN THE BEARING COLLAR, A SNAP RING WITHIN THE RECESS IN THE BEARING COLLAR EXTERIOR OF THE THRUST BEARING FOR SECURING THE THRUST BEARING WITHIN THE BEARING COLLAR, A POSITIONING FIXTURE COMPRISING A HATSHAPED MEMBER HAVING A RADIALLY OUTWARDLY EXTENDING FLANGE AT THE OPEN END THEREOF ENGAGED WITH THE THRUST BEARING WITHIN THE RECESS IN THE ANNULAR BEARING COLLAR OUTWARDLY OF THE RECESS WITH RESPECT TO THE SNAP-RING AND SURROUNDING THE SLIDE, SAID HAT-SHAPED MEMBER HAVING AN OPENING IN THE TOP THEREOF AND AN AXIALLY EXTENDING ANNULAR FLANGE AROUND SAID OPENING THROUGH WHICH A TOOL CARRIED BY THE SLIDE EXTENDS, SAID AXIALLY EXTENDING FLANGE SERVING TO RADIALLY LOCATE THE TOOL WITH THE TOP SURFACE OF THE HAT-SHAPED MEMBER SERVING TO LOCATE THE TOOL AXIALLY WITH RESPECT TO THE WORKPIECE AND MEANS EXTENDING OVER THE RADIALLY OUTWARDLY EXTENDING FLANGE ON THE POSITIONING FIXTURE SECURED TO THE ANNULAR BEARING COLLAR OUTWARDLY OF THE RADIALLY OUTWARDLY EXTENDING FLANGE OF THE POSITIONING FIXTURE WITH RESPECT TO THE RECESS IN THE ANNULAR BEARING COLLAR FOR SECURING THE POSITIONING FIXTURE WITHIN THE RECESS.