Extrusion devices

Claim 1

A METAL EXTRUSION PRESS COMPRISING, IN COMBINATION, A BILLET CONTAINER HAVING A BILLET RECEIVING PASSAGE WITH AN INNER DIAMETER GREATER THAN THAT OF A BILLET TO BE EXTRUDED; A RAM RECIPROCABLE AXIALLY INTO END OUT OF SAID CONTAINER PASSAGE; A SEAL ON THE END OF SAID RAM ENGAGEABLE WITH THE INNER SURFACE OF SAID PASSAGE TO SEAL THE ENTRY END THEREOF WHEN A BILLET IN THE CONTAINER IS ENGAGED BY SAID RAM PRIOR TO EXTRUSION; A RELATIVELY SMALL DIAMETER RADIAL VENTING BORE FORMED THROUGH THE CONTAINER WALL AXIALLY INWARDLY OF THE INITIAL POSITION OF SAID SEAL AND COMMUNICATING WITH THE BILLET PASSAGE; A RELATIVELY LARGE DIAMETER SECOND BORE COMMUNICATING WITH THE OUTER END OF SAID VENTING BORE AND COAXIAL THEREWITH; A VENTING PASSAGE COMMUNICATING LATERALLY WITH SAID SECOND BORE ADJACENT ITS JUNCTION WITH SAID VENTING BORE; A PLUNGER RECIPROCABLE AXIALLY OF SAID BORES AND HAVING A REDUCED DIAMETER EXTENSION WHICH, IN ONE POSITION OF SAID PLUNGER, ENTERS AND CONFORMINGLY SEALS SAID VENTING BORE, IN THE INNER END OF SAID REDUCED DIAMETER EXTENSION BEING FORMED TO CONFORM TO THE INNER SURFACE OF THE BILLET PASSAGE; SAID PLUNGER BEING MOVABLE TO A SECOND POSITION ESTABLISHING COMMUNICATION BETWEEN SAID VENTING BORE AND SAID VENTING PASSAGE; DOUBLE ACTING PISTON AND CYLINDER MEANS OPERABLE TO MOVE SAID PLUNGER BETWEEN ITS TWO SAID POSITIONS; AND AN ELECTRICALLY ENERGIZED VALVE CONTROLLING CONNECTIONS OF OPPOSITE SIDES OF THE PISTON OF SAID PISTON AND CYLINDER MEANS TO EXHAUST AND TO A SOURCE OF FLUID UNDER PRESSURE, SAID VALVE, WHEN DE-ENERGIZED, BEING BIASED TO A POSITION CONTROLLING THE CONNECTIONS OF SAID PISTON AND CYLINDER MEANS TO MOVE SAID PLUNGER TO SAID ONE VENT BORE SEALING POSITION; AN ELECTRIC MOTOR DRIVEN VACUUM PUMP CONNECTED TO SAID VENTING PASSAGE; MEANS OPERABLE RESPONSIVE TO MOVEMENT OF SAID RAM INTO THE BILLET PASSAGE TO ENGAGE A BILLET THEREIN PRIOR TO EXTRUSION, TO ENERGIZE SAID VALVE TO REVERSE THE CONNECTIONS TO SAID PISTON AND CYLINDER MEANS TO MOVE SAID PLUNGER TO ITS RETRACTED SECOND POSITION; AND MEANS OPERABLE BY SAID DOUBLE ACTING PISTON AND CYLINDER MEANS, RESPONSIVE TO MOVEMENT OF SAID PLUNGER TO ITS RETRACTED SECOND POSITION, TO CLOSE AN ENERGIZING CIRCUIT FOR THE MOTOR OF SAID VACUUM PUMP.