Clamping arrangement for pressure casting apparatus

Claim 1

IN A PRESSURE CASTING ARRANGEMENT, THE COMBINATION OF: A PRESSURE TANK OPEN AT THE TOP, A DETACHABLE COVER FOR CLOSING THE OPEN TOP OF SAID TANK, A PLURALITY OF DOWNWARDLY DEPENDING CLAMPING ARMS SECURED TO SAID COVER AND SPACED GENERALLY CIRCUMFERENTIALLY THEREABOUT, EACH OF SAID CLAMPING ARMS COMPRISING AN ELONGATED BODY PORTION, A GENERALLY UPWARDLY DIRECTED ABUTMENT SURFACE FORMED ON SAID BODY PORTION NEAR THE LOWER END THEREOF, ROLLER MEANS PIVOTALLY SECURED TO SAID BODY PORTION NEAR SAID LOWER END, A PLURALITY OF DOWNWARDLY DIRECTED MOUNTING BRACKETS CONTINUOUSLY SECURED TO SAID COVER, A PIVOT MEMBER PIVOTALLY SECURING EACH OF SAID CLAMPING ARMS NEAR THEIR RESPECTIVE UPPER ENDS TO SAID MOUNTING BRACKETS, A PLURALITY OF LATERALLY EXTENDING SUPPORT ASSEMBLIES SECURED TO SAID TANK IN A MANNER RADIATING GENERALLY OUTWARDLY THEREFROM, A PRESSURE RESPONSIVE PISTON AND CYLINDER ASSEMBLY RECEIVED AND RETAINED BY EACH OF SAID SUPPORT ASSEMBLIES, A SOURCE OF PRESSURE FLUID CONNECTED TO EACH OF SAID PRESSURE RESPONSIVE PISTON AND CYLINDER ASSEMBLIES, SAID PRESSURE RESPONSIVE ASSEMBLIES BEING RECEIVED BY SAID SUPPORT ASSEMBLIES IN A MANNER ENABLING DOWNWARD MOVEMENT OF SAID PISTON IN A DIRECTION SLIGHTLY INCLINED FROM THE VERTICAL AND TOWARD SAID TANK WHENEVER ACTUATED BY SAID SOURCE OF PRESSURE FLUID, AND A PLURALITY OF GUIDE STRUCTURES FORMED ON SAID TANK EXTERNALLY THEREOF AND ARRANGED SO AS TO BE GENERALLY IN JUXTAPOSITION WITH SAID SUPPORT ASSEMBLIES, EACH OF SAID GUIDE STRUCTURES COMPRISING AN INCLINED GUIDE SURFACE EXTENDING BOTH DOWNWARDLY AND AWAY FROM SAID TANK, A VERTICALLY EXTENDING AND DOWNWARDLY DIRECTED ABUTMENT SURFACE FORMED AT THE LOWERMOST END OF SAID GUIDE SURFACE, SAID GUIDE SURFACES AND ROLLER MEANS BEING EFFECTIVE TO CONTINUOUSLY POSITION SAID LOWER ENDS OF SAID CLAMPING ARMS AS SAID COVER IS BEING LOWERED ONTO THE TANK IN ORDER TO PLACE SAID UPWARDLY DIRECTED ABUTMENT SURFACE IN THE NORMAL PATH OF TRAVEL OF SAID PISTON, AND SAID VERTICALLY EXTENDING ABUTMENT SURFACES AND SAID ROLLER MEANS BEING EFFECTIVE TO LIMIT LATERAL MOVEMENT OF SAID LOWER ENDS OF SAID CLAMPING ARMS WHEN SAID PISTON IS URGED AGAINST SAID UPWARDLY DIRECTED ABUTMENT SURFACE UPON ACTUATION BY SAID SOURCE OF FLUID PRESSURE.