Centrifugal separators

Claim 1

IN A CENTRIFUGAL SEPARATOR HAVING A STATIONARY HOUSING WITHIN WHICH A ROTATABLE BASKET IS MOUNTED, A CLOSED HYDRAULIC CIRCUIT INCLUDING AN HYDRAULIC PUMP AND MOTOR MEANS FOR ROTATING AS WELL AS STOPPING THE ROTATION OF SAID BASKET; AN ELECTRIC MOTOR FOR OPERATING SAID PUMP AND MOTOR MEANS; A COVER PLATE ADAPTED TO PROVIDE ACCESS TO THE INTERIOR OF SAID SEPARATOR; SWITCH MEANS WITHIN THE CIRCUIT FOR SAID ELECTRIC MOTOR FOR DE-ENERGIZING SAID ELECTRIC MOTOR WHEN SAID COVER PLATE IS OPENED; AN INTERLOCKING ELEMENT; A CYLINDER MOUNTED ON THE TOP OF SAID HOUSING; INTER-COMMUNICATING AXIALLY ALIGNED RELATIVELY SMALL AND LARGE CYLINDRICAL PASSAGES WITHIN SAID CYLINDER; A PISTON WITHIN SAID RELATIVELY LARGE CYLINDRICAL PASSAGE; A ROD CONNECTED TO SAID INTERLOCK WITH SAID COVER PLATE TO PREVENT ITS OPENING; A PAIR OF FREELY FLOATING PISTONS WITHIN SAID RELATIVELY SMALL PASSAGE, ALL OF SAID PISTONS BEING IN SUCCESSIVE AXIAL ABUTTING RELATION WHEN THE PISTON IN SAID LARGE CYLINDRICAL PASSAGE IS IN RETRACTED POSITION; MEANS FOR CONNECTING THE ONE SIDE OF SAID HYDAULIC PUMP AND MOTOR MEANS TO THE END OF SAID CYLINDER AT A PORT SUCH THAT A HYDRAULIC FORCE IS APPLIED IN LINE WITH SAID PISTONS; MEANS FOR CONNECTING THE OPPOSITE SIDE OF SAID PUMP AND MOTOR MEANS TO SAID CYLINDER AT A PORT IN POSITION TO ACT ON BOTH OF THE PISTONS IN SAID SMALL PASSAGE WHEN THEY ARE IN THEIR RETRACTED POSITIONS; AND A COMPRESSION SPRING WITHIN SAID LARGE PASSAGE AND ACTING ON THE PISTON THEREIN TENDING TO MOVE IT TO ITS RETRACTED POSITION.