Expansible chamfering attachment for a rotatable reamer

Claim 1

IN COMBINATION WITH A PIPE REAMER OF THE TYPE INCLUDING AN ELONGATED SHANK HAVING ONE END PORTION ADAPTED TO BE GRIPPED BY A ROTATABLE CHUCK AND A REAMER BODY ON THE OTHER END ADAPTED TO REAM THE INTERNAL SURFACES OF A PIPE SECTION, AN EXPANSIBLE CHAMFERING ATTACHMENT COMPRISING A DISK-SHAPED BODY MEMBER HAVING A BORE FORMED THERETHROUGH THROUGH WHICH SAID SHANK IS RECEIVED WITH SAID BODY MEMBER DISPOSED ADJACENT SAID REAMER BODY, SAID BODY MEMBER INCLUDING MEANS REMOVABLY SECURING SAID BODY MEMBER TO SAID SHANK, A PLURALITY OF ELONGATED ARM MEMBERS, MEANS PIVOTALLY SECURING CORRESPONDING ENDS OF SAID ARM MEMBERS TO SAID BODY MEMBER ABOUT AXES EXTENDING TRANSVERSELY OF SAID BORE AND ARM MEMBERS WITH THE FREE ENDS OF SAID ARM MEMBERS EXTENDING LONGITUDINALLY OF SAID SHANK DISPOSED ABOUT SAID REAMER BODY AND MOUNTED FOR GENERALLY RADIAL MOVEMENT RELATIVE TO SAID REAMER BODY, THE CONFRONTING SIDES OF SAID ARM MEMBERS INCLUDING CUTTING EDGES ADAPTED TO CHAMFER THE OUTER SURFACES OF THE END OF A PIPE OR THE LIKE INTO WHICH SAID REAMER BODY IS INSERTED, MEANS SUPPORTED SOLELY FROM SAID ARM MEMBERS AND YIELDINGLY URGING THE FREE ENDS OF SAID ARM MEMBERS RADIALLY INWARDLY.