Eccentric boring head

Claim 1

A METAL WORKING TOOL COMPRISING, A HUB MEMBER HAVING A THROUGH BORE EXTENDING FROM A WORK END TO A MOUNTING END, SAID HUB MEMBER HAVING A RADIALLY PROJECTING MOUNTING FLANGE AT SAID MOUNTING END, SAID HUB MEMBER HAVING A COUNTERBORE AT SAID MOUNTING END, A PILOT FLANGE DISPOSED IN SAID COUNTERBORE AND INCLUDING LOCATING MEANS PROJECTING REARWARDLY THEREFROM AND DISPOSED ECCENTRICALLY WITH RESPECT TO SAID BORE, A BORING BAR SUPPORT MEMBER HAVING AN OUTER SUPPORT END AND A SHANK PORTION DISPOSED IN THE BORE AND TERMINATING AT AN INNER ADJUSTMENT END, SAID SHANK PORTION HAVING A PLURALITY OF LONGITUDINALLY DISPOSED GEAR TEETH GROOVES EXTENDING FROM THE INNER ADJUSTMENT END FORWARDLY TOWARD THE SUPPORT END AND DEFINING A PLURALITY OF GEAR TEETH THEREBETWEEN, A WORM JOURNALED IN THE HUB MEMBER AND IN LONGITUDINALLY SLIDABLE ENGAGEMENT WITH THE GEAR TEETH, AN ANTIFRICTION BEARING INTERPOSED BETWEEN SAID SHANK PORTION AND SAID BORE AND DISPOSED FORWARDLY OF SAID WORM, ONE OF SAID MEMBERS INCLUDING AN ANNULAR SEALING SHOULDER BETWEEN SAID BEARING AND SAID OUTER END AND OVERLYING THE BEARING IN SEALING, SLIDING ABUTMENT WITH THE OTHER MEMBER, SAID MEMBERS BEING FIRST AND SECOND MEMBERS, A RETENTION SHAFT SECURED TO THE FIRST MEMBER AND HAVING AN ENLARGED HEAD, ANNULAR THRUST MEANS DISPOSED AROUND SAID SHAFT, BIASING MEANS INTERPOSED BETWEEN THE THRUST MEANS AND THE HEAD AND URGING THE THRUST MEANS INTO ENGAGEMENT WITH THE SECOND MEMBER, AND A BORING BAR CARRIED BY THE BORING BAR SUPPORT MEMBER.