Retractable front landing gear for cargo aircraft

Claim 1

IN AN AIRCRAFT HAVING AN ACCESS OPENING THEREIN TO PERMIT ON-AND-OFF LOADING OF CARGO THERETHROUGH AND A REMOVABLE CLOSURE FOR SAID OPENING DURING FLIGHT OF THE AIRCRAFT, THE COMBINATION OF A RAMP CARRIED BY THE AIRCRAFT AND EXTENSIBLE AND RETRACTABLE THROUGH SAID OPENING WHEN SAID CLOSURE IS REMOVED TO FACILITATE SAID ON-AND-OFF LOADING, A LANDING GEAR TO SUPPORT SAID AIRCRAFT DURING GROUND OPERATIONS, A HINGE CONNECTING SAID LANDING GEAR TO SAID RAMP FOR SWINGING MOVEMENT INDEPENDENT THEREOF TO AND FROM A RETRACTED POSITION WITHIN THE AIRCRAFT AND A PROTRACTED POSITION EXTERNALLY OF THE AIRCRAFT AND FOR SWINGING MOVEMENT IN UNISON THEREWITH UPON EXTENSION AND RETRACTION OF THE RAMP AS AFORESAID, A PASSAGE THROUGH SAID CLOSURE FOR SAID LANDING GEAR WHEN THE CLOSURE COVERS SAID ACCESS OPENING, AT LEAST ONE DOOR ADAPTED TO CLOSE SAID PASSAGE DURING FLIGHT OF THE AIRCRAFT, AND AN OPERATING MECHANISM CONNECTING SAID LANDING GEAR AND EACH SAID DOOR FOR THE SYNCHRONIZED MOVEMENT THEREOF WHEREBY EACH SAID DOOR MOVES TO THE OPEN POSITION PRIOR TO PROTRACTION OF THE LANDING GEAR AND TO THE CLOSED POSITION FOLLOWING RETRACTION THEREOF.