Mancuso

Claim 1

A TOOL HOLDER INCLUDING: A MASTER BASE ADAPTED TO BE ADJUSTABLY SECURED TO A LATHE COMPOUND REST, SAID MASTER BASE HAVING A PLANE BASE SURFACE, A TOP, AND AN END SURFACE PROVIDED WITH A PAIR OF SPACED APART RAILS NORMAL TO THE BASE SURFACE, SAID MASTER BASE PROVIDED WITH A SMOOTH BORE EXTENDING BETWEEN THE BASE AND TOP AND PROVIDED WITH A SECOND SMOOTH BORE WHICH INTERSECTS THE FIRST NAMED BORE AT RIGHT ANGLES THERETO AND EXTENDING OUTWARDLY OF THE END BETWEEN THE PAIR OF PARALLEL RAILS; AN ADAPTER FOR TOOL BITS FORMED AT ONE END WITH A PAIR OF PARALLEL SPACED APART WAYS FOR RECEIVING THE PAIR OF RAILS THEREIN, SAID ADAPTER HAVING TOP AND BASE SURFACES AND PROVIDED WITH A T-SLOT EXTENDING TRANSVERSELY BETWEEN THE TOP AND BASE SURFACES, A T-TYPE DRAW PLATE AND ARBOR WITHIN THE T-SLOT OF THE ADAPTER, THE ARBOR EXTENDING BEYOND AN END OF THE ADAPTER FOR RECEPTION IN THE SECOND NAMED BORE OF THE MASTER BASE, THE DRAW PLATE HAVING A WIDTH SUFFICIENT TO BRIDGE THE PAIR OF RAILS, A LOCKING SHAFT IN THE FIRST NAMED BORE OF THE MASTER BASE, SAID ARBOR PROVIDED WITH A TRANSVERSE TAPERED BORE AND SAID LOCKING SHAFT HAVING AN UPPER PORTION ADAPTED TO RECEIVE AT ITS TOP A HANDLE TO ROTATE THE SHAFT, BELOW THAT A SMOOTH CYLINDRICAL PORTION IN SAID FIRST NAMED BORE AND BELOW THE CYLINDRICAL PORTION AN INTERMEDIATE TAPERED PORTION POSITIONED WITHIN SAID TAPERED BORE AND A LOWER PORTION IN SAID FIRST NAMED BORE HAVING MEANS FOR CAUSING AXIAL TRAVEL OF THE LOCKING SHAFT WHEN THE LOCKING SHAFT IS ROTATED TO CAUSE MOVEMENT OF THE ARBOR AND DRAW PLATE TO LOCK THE RAILS IN THE WAYS.