Tank cap

In combination, a cap for an oil tank mounted in an aircraft having an access door mounted in proximity to the cap and retractable to allow access to the cap, said cap having a circular body adapted to fit into the neck of the tank, a seal around the periphery of said circular body engaging the wall of the neck for sealing the fluid contained by the tank, a hub having lug elements extending radially and fitting complimentary recesses formed in a lip in said neck, a plunger rod extending through said circular body connected to said hub for rotating said lugs and positioning said lugs relative to said circular body, a handle mounted on one end of said plunger rod remote from said lugs for rotating and positioning said lugs, said cap being hingedly connected to said neck, said hinge connection including a pair of tandem mounted hinges, one of said hinges being connected to said neck and the other of said hinges being connected to said cap, a hinge element disposed between said neck and cap hingedly supporting said cap to said neck for obtaining relative parallel movement of said seal relative to the wall of said neck when said cap is being placed in an open and closed position, an extension element on said handle, a cooperating cam therefor extending from said neck for limiting rotation of said handle in a given direction when the cap is in the fully retracted position, and means on said handle preventing closure of said access door when said cap is in the unsecured condition.