Free piston motor

Claim 1

A FREE PISTON MOTOR COMPRISING, IN COMBINATION, A MOTOR CYLINDER HAVING OPPOSITE CLOSED ENDS; A PAIR OF MOTOR PISTONS ARRANGED IN SAID MOTOR CYLINDER MOVABLE ALONG A COMPRESSION STROKE TOWARD EACH OTHER TO AN INNER DEAD CENTER POSITION AND AN OPPOSITE COMBUSTION STROKE TOWARD AN OUTER DEAD CENTER POSITION, EACH OF SAID MOTOR PISTONS HAVING A REAR FACE AND DEFINING WITH THE RESPECTIVE CLOSED END OF SAID MOTOR CYLINDER A PRESSURE CHAMBER ADAPTED TO BE FILLED WITH AIR AND CONSTITUTING A FIRST PENUMATIC SPRING TENDING TO MOVE THE RESPECTIVE MOTOR PISTON TOWARD SAID INNER DEAD CENTER POSITION; A PAIR OF ADDITIONAL CYLINDERS HAVING AT LEAST ONE CLOSED END; A PAIR OF ADDITIONAL PISTONS RESPECTIVELY MOVABLY ARRANGED IN SAID ADDITIONAL CYLINDERS AND EACH DEFINING WITH SAID ONE CLOSED END OF THE LATTER A CHAMBER ADAPTED TO BE FILLED WITH AIR AND CONSTITUTING A SECOND PNEUMATIC SPRING; CONNECTING MEANS CONNECTING EACH OF SAID ADDITIONAL PISTONS WITH A RESPECTIVE ONE OF SAID MOTOR PISTONS FOR SIMULTANEOUS MOVEMENT; INJECTOR MEANS FOR INJECTING FUEL INTO THE SPACE BETWEEN SAID WORKING PISTONS; STARTER MEANS FOR FEEDING COMPRESSED AIR INTO SAID PRESSURE CHAMBER FOR MOVING SAID WORKING PISTONS TOWARD EACH OTHER END FOR MOVING SAID ADDITIONAL PISTONS WITH SAID WORKING PISTONS CAUSING THEREBY COMBUSTION OF FUEL INJECTED IN SAID SPACE AND SUBSEQUENT MOVEMENT OF SAID PISTONS IN THE OPPOSITE DIRECTION, COMPRESSING THE AIR IN SAID PRESSURE CHAMBER OF SAID WORKING CYLINDER AND IN SAID CHAMBERS OF SAID ADDITIONAL CYLINDERS; AND MEANS CONTROLLED BY SAID PISTONS DURING SUBSEQUENT STROKES THEREOF FOR DISCHARGING EXCESS AIR FROM SAID PRESSURE CHAMBERS OF SAID MOTOR CYLINDER AND FOR SUCKING AIR INTO SAID CHAMBERS OF SAID ADDITIONAL CYLINDERS TO GRADUALLY EQUALIZE THE PRESSURE IN SAID CHAMBERS.