Double acting two stroke cycle internal combustion engines

Claim 1

IN A DOUBLE ACTING TWO STROKE CYCLE INTERNAL COMBUSTION ENGINE, THE COMBUSTION OF A CRANKCASE, A CRANKSHAFT ROTATABLY MOUNTED IN SAID CRANKCASE, A WORKING CYLINDER FASTENER TO SAID CRANKCASE, A FRONT VALVE CYLINDER AND A BACK VALVE CYLINDER FASTENED TO SAID WORKING CYLINDER, SAID VALVE CYLINDERS BEING SMALLER IN DIAMETER THAN SAID WORKING CYLINDERS BEING SMALLER IN DIAMETER THAN SAID SAID VALVE CYLINDERS BEING SMALLER IN DIAMETER THAN SAID WORKING CYLINDER, A DOUBLE ACTING WORKING PISTON RECIPROCABLE IN SAID WORKING CYLINDER, A FRONT VALVE PISTON RECIPROCABLE IN SAID FRONT VALVE CYLINDER, A BACK VALVE PISTON RECIPROCABLE IN SAID BACK VALVE CYLINDER, SAID VALVE PISTONS BEING FASTENED TO SAID WORKING PISTON SO AS TO FORM A RECIPROCATING PISTON ASSEMBLY, A CONNECTING ROD INTERCONNECTING SAID CRANKSHAFT AND SAID PISTON ASSEMBLY, SAID WORKING CYLINDER HAVING A FRONT WORKING CHAMBER AND A BACK WORKING CHAMBER INSIDE IT, SAID WORKING CYLINDER HAVNG EXHAUST PORTS LOCATED IN ITS WALL, SAID WORKING PISTION BEING ADAPTED TO CONTROL SAID EXHAUST PORTS, MEANS FOR SUPPLYING SCAVENGE AIR TO SAID ENGINE WHILE RUNNING DOUBLE ACTING, EACH VALVE PISTON BEING ADAPTED TO ADMIT SCAVENGE AIR TO ITS RESPECTIVE WORKING CHAMBER, EACH WORKING CHAMBER HAVING A UNIFLOW TYPE SCAVENGING OPERATION EXHAUSTING THROUGH SAID EXHAUST PORTS, SAID ENGINE BEING ADAPTED TO OPERATE SINGLE ACTING DURING STARTING AND LOW POWER OPERATION, ONE OF SAID WORKING CHAMBERS BEING HEREBY DESIGNATED CHAMBER A AND THE OTHER SAID WORKING CHAMBER BEING HEREBY DESIGNED CHAMBER B, CHAMBER A SERVING INITIALLY AS A SCAVENGE PUMP FOR SUPPLYING SCAVENGE AIR TO CHAMBER B DURING STARTING AND LOW POWER OPERATION OF THE ENGINE, A FIRST VALVE IN COMMUNICATION WITH CHAMBER A, SAID FIRST VALVE BEING CLOSED DURING DOUBLE ACTING OPERATION OF THE ENGINE, MEANS FOR HOLDING SAID FRIST VALVE OPEN DURING STARTING AND LOW POWER OPERATION OF THE ENGINE, PASSAGE MEANS FOR CONDUCTING SCAVENGE AIR FROM SAID FIRST VALVE TO CHAMBER B, A SECOND VALVE ADAPTED TO ADMIT AIR TO THE INTERIOR OF CHAMBER A DURING A STROKE OF SAID PISTON ASSEMBLY, AND SAID SECOND VALVE SERVING TO PERVENT THE ESCAPE OF SCAVENGE AIR (TO THE ATMOSPHERE) DURING A REVERSE STROKE OF SAID PISTON ASSEMBLY.