Engine

Claim 1

AN INTERNAL COMBUSTION ENGINE COMPRISING A CYLINDER HAVING AN OPENING AT THE HEAD END THEREOF, A HOLLOW EXTENSION PROJECTING FROM SAID CYLINDER HEAD, A CRANKCASE COMMUNICATING WITH THE OTHER END OF SAID CYLINDER, A PISTON MOVABLE AXIALLY WITHIN SAID CYLINDER BETWEEN A TOP DEAD CENTER POSITION ADJACENT TO SAID CYLINDER HEAD END AND A BOTTOM DEAD CENTER POSITION TO DEFINE A COMBUSTION CHAMBER OF VARIABLE VOLUME, SAID PISTON HAVING A FACE WITH A BORE THERETHROUGH, A HOLLOW NECK PROJECTING FROM SAID PISTON FACE IN COMMUNICATION WITH SAID BORE AND PASSING THROUGH SAID OPENING AT THE HEAD END OF SAID CYLINDER IN FLUID-TIGHT RELATION THERETO AND IN TELESCOPIC RELATION TO SAID HOLLOW EXTENSION, SAID NECK HAVING IN SPACED RELATION TO SAID PISTON FACE MEANS DEFINING A SUPPLY PORT LOCATED SO AS TO BE IN COMMUNICATION WITH SAID COMBUSTION CHAMBER WHEN SAID PISTON IS ADJACENT TO SAID BOTTOM DEAD CENTER POSITION, AND TO BE OUT OF COMMUNICATION WITH SAID COMBUSTION CHAMBER WHEN SAID PISTON IS SUBSTANTIALLY SPACED FROM SAID BOTTOM DEAD CENTER POSITION, MEANS ON ONE OF SAID NECK AND SAID EXTENSION AND IN COMMUNICATION WITH SAID CRANKCASE FOR ADMITTING COMBUSTION AIR TO SAID CRANKCASE, SAID MEANS ADMITTING COMBUSTION AIR TO SAID CRANKCASE INCLUDING A REED VALVE PREVENTING ESCAPE OF COMBUSTION AIR FROM SAID CRANKCASE DURING TRAVEL OF SAID PISTON TOWARD BOTTOM DEAD CENTER AND PERMITTING ENTRY OF AIR INTO SAID CRANKCASE DURING TRAVEL OF SAID PISTON TOWARD TOP DEAD CENTER, AND MEANS IN THE SIDE OF SAID CYLINDER DEFINING AN EXHAUST PORT SPACED FROM THE HEAD END OF SAID COMBUSTION CHAMBER WHEN SAID COMMUNICATION WITH SAID COMBUSTION CHAMBER WHEN SAID PISTON IS ADJACENT TO SAID BOTTOM DEAD CENTER POSITION, AND TO BE CLOSED WHEN SAID PISTON IS SUBSTANTIALLY SPACED FROM SAID BOTTOM DEAD CENTER POSITION.