Air-hydraulic ram

Claim 1

A HYDRAULIC PRESS INCORPORATING A DOUBLE-ACTING RAM, A POWER CYLINDER IN WHICH THE RAM IS SLIDABLE IN FLUIDTIGHT SLIDING RELATION, AN AXILIARY CYLINDER DISPOSED ABOVE SAID POWER CYLINDER, AN INTENSIFIER CYLINDER DISPOSED ABOVE SAID AUXILIARY CYLINDER, AN INTENSIFIER PISTON SLIDABLE IN SAID INTENSIFIER CYLINDER IN FLUID-TIGHT SLIDING RELATION, A FREE PISTON SLIDABLE IN SAID AUXILIARY CYLINDER IN FLUID-TIGHT SLIDING RELATION A PLUNGER ATTACHED TO SAID INTENSIFIER PISTON, AN OPENING IN SAID FREE PISTON THROUGH WHICH SAID PLUNGER PASSES, AN OPENING BEING IN COMMUNICATION WITH A CYLINDER THROUGH WHICH SAID PLUNGER CAN ENTER SAID POWDER CYLINDER, SAID OPENING BEING IN COMMUNICATION WITH A FIRST END OF SAID AUXILIARY CYLINDER AND WITH SAID FIRST END OF SAID POWER CYLINDER WHEN SAID PLUNGER IS IN ITS UPPERMOST POSITION, SAID COMMUNICATION BEING BLOCKED BY SAID PLUNGER WHEN SAID PLUNGER IS MOVED DOWNWARDLY A GIVEN AMOUNT FROM ITS UPPERMOST POSITION, MEANS FOR ADMITTING A CHARGE OF OPERATING LIQUID TO SAID FIRST END OF THE POWER CYLINDER AND TO SAID FIRST END OF THE AUXILIARY CYLINDER, VALVE MEANS HAVING AN INLET FOR PRESSURE AIR AND A PLURALITY OF VALVE PORTS, MEANS CONTROLLING COMMUNICATION BETWEEN SAID PRESSURE AIR INLET AND SAID VALVE PORTS, A FIRST DUCT STRUCTURE CONNECTING A FIRST ONE OF SAID VALVE PORTS TO A SECOND END<OF THE AUXILIARY CYLINDER AND TO A FIRST END OF THE INTENSIFIER CYLINDER, A SECOND DUCT STRUCTURE CONNECTING A SECOND ONE OF SAID VALVE PORTS TO A SECOND END OF THE INTENSIFIER CYLINDER, A THIRD DUCT STRUCTURE CONNECTING A THIRD ONE OF SAID VALVE PORTS TO A SECOND END OF THE POWER CYLINDER, SAID COMMUNICATION CONTROLLING MEANS BEING OPERATIVE INTO A CONDITION ALLOWING ADMISSION OF PRESSURE AIR THROUGH SAID FIRST PORT AND FIRST DUCT STRUCTURE TO THE SECOND END OF THE AUXILIARY CYLINDER AND THE FIRST END OF THE INTENSIFIER CYLINDER, TO CAUSE THE PLUNGER TO ENTER THE POWER CYLINDER, TO PERMIT AIR TO EXHAUST FROM THE SECOND END OF THE INTENSIFIER CYLINDER THROUGH SAID SECOND DUCT STRUCTURE AND SAID SECOND PORT AND TO PERMIT AIR TO EXHAUST FROM THE SECOND END OF THE POWER CYLINDER THROUGH SAID THIRD DUCT STRUCTURE AND SAID THIRD PORT, AND SAID COMMUNICATION CONTROLLING MEANS BEING OPERATIVE INTO AN ALTERNATIVE CONDITION ALLOWING ADMISSION OF PRESSURE AIR THROUGH SAID SECOND PORT AND SECOND DUCT STRUCTURE TO THE SECOND END OF THE INTENSIFIER CYLINDER AND THROUGH SAID THIRD PORT AND THIRD DUCT STRUCTURE TO SAID SECOND END OF THE POWER CYLINDER, AND TO PERMIT AIR TO EXHAUST THROUGH SAID FIRST DUCT STRUCTURE AND SAID FIRST PORT FROM SAID SECOND END OF THE AUXILIARY CYLINDER AND SAID FIRST END OF THE INTENSIFIER CYLINDER.