Internal combustion engines, and in particular free piston engines, of the gaseous fuel injection type

Claim 1

IN COMBINATION A FREE PISTON GENERATOR, FIRST MEANS FOR FEEDING A LIQUID FUEL TO SID FREE PISTON GENERATOR, SECOND MEND FOR FEEDING A GASEOUS FUEL TO SAID FREE PISTON GENERATOR, BOTH OF SID FIRST AND SECOND MEANS BEING OPERATIVE BY A REGULATING PRESSURE, A FIRST CIRCUIT FOR SUPPLY SAID REGULATING PRESSURE TO SAID FIRST MEANS, FIRST SAFETY DEVICES WITHIN SAID FIRST CIRCUIT CONTROLLED BY FIRST FACTORS OF OPERATION OF SAID FREE PISTON GENERATOR AND ADAPTED TO CUT OFF THE DOWNSTREAM PORTION OF SAID FIRST CIRCUIT FROM ITS UPSTREAM PORTION AND TO CONNECT THE FORMER PORTION WITH THE ATMOSPHERE WHEN SAID FIRST FACTORS OF OPERATION COME OUT FROM A PREDETERMINED RANGE OF VALUES, A SECOND CIRCUIT FOR SUPPLYING SAID REGULATING PRESSURE TO SAID SECOND MEANS, SECOND SAFETY DEVICES WITHIN SAID SECOND CIRCUIT CONTROLLED BY SECOND FACTORS OF OPERATION OF SAID FREE PISTON GENERATOR ADAPTED TO CUT OFF THE DOWNSTREAM PORTION OF SAID SECOND CIRCUIT FROM ITS UPSTREAM PORTION AND TO CONNECT THE FORMER PORTION WITH THE ATMOSPHERE HEN SAID SECOND FACTORS OF OPERATION COME OUT FROM A PREDETERMINED RANGE OF VALUES, SAID SECOND CIRCUIT BRANCHING OFF FROM SAID FIRST CIRCUIT DOWNSTREAM FROM SAID FIRST SAFETY DEVICES, WHEREBY OPERATION OF SAID FIRST SAFETY DEVICES CUTS OFF BOTH THE LIQUID AND GASEOUS FUEL FEEDING TO SAID FREE PISTON GENERATOR WHEREAS OPERATION OF SAID SECOND SAFETY DEVICES CUTS OFF ONLY THE GASEOUS FUEL FEEDING TO SAID FREE PISTON GENERTOR.