Tool assembly for a metal working press

Claim 1

A TOOL ASSEMBLY FOR A METAL EXTRUSION PRESS, COMPRISING A HOLLOW, PRESSURE APPLYING STEM; A MANDREL HAVING A METAL ENGAGING FRONT END AND A REAR END CARRYING INTERNAL THREADS; A GENERALLY PLUG-SHAPED ADAPTER CONSISTING OF RELATIVELY EASILY MACHINABLE MATERIAL AND INCLUDING AN EXTERNALLY THREADED END FOR ENGAGING SAID THREADS OF THE MANDREL, AND A BAYONET END HAVING A PLURALITY OF EXTERNAL GROOVES AND PROJECTIONS EXTENDING PARALLEL TO THE AXIS OF SAID GENERALLY PLUG-SHAPED ADAPTER, THE TERMINAL FACE OF SAID BAYONET END BEING PROVIDED WITH A CIRCULAR GROOVE; A PAIR OF SPACED ABUTMENTS POSITIONED IN SAID CIRCULAR GROOVE AND SECURED TO SAID ADAPTER; A MANDREL HOLDER MOVABLE WITHIN SAID HOLLOW STEM AND HAVING A BAYONET SOCKET PROVIDED WITH AXIALLY EXTENDING GROOVES AND PROJECTIONS TO ACCOMMODATE SAID BAYONET END OF THE ADAPTER; AND AN ABUTMENT SECURED TO THE BOTTOM OF SAID BAYONET SOCKET, THE LAST-NAMED ABUTMENT BEING ARRANGED TO PROTRUDE INTO SAID CIRCULAR GROOVE OF THE ADAPTER SO AS TO BE ENGAGED BY ONE OF THE ABUTMENTS OF THE ADAPTER WHEN SAID PROJECTIONS OF THE ADAPTER AND MANDREL HOLDER ARE IN ALIGNMENT WITH EACH OTHER TO LOCK THE ADAPTER IN SAID HOLDER, SAID ADAPTER WHEN IN OPERATIVE POSITION BEING RECEIVED SUBSTANTIALLY ENTIRELY WITHIN SAID INTERNALLY THREADED REAR END OF THE MANDREL AND SAID BAYONET SOCKET OF THE MANDREL HOLDER, WHEREBY THE INTERIOR WALL OF SAID HOLLOW STEM IS PROTECTED FROM CONTACT WITH SAID ADAPTER.