Patent ID: 8042705

Claim:
A cap ( 4 ) for safely filling and closing an engine oil tank ( 1 ), the cap ( 4 ) comprising an elongated tubular oil feed body ( 6 ) having a first end portion ( 8 ) fitted in a fluidtight manner to an inlet ( 3 ) of an engine oil tank ( 1 ); a removable cover body ( 25 ) for closing said first end portion ( 8 ); an oil feed valve ( 23 ) fitted to the tubular body ( 6 ) and movable between an open position, allowing oil flow into the tank, and a closed position, preventing oil outflow from the tank; and a dipstick ( 26 ) for measuring the oil level in the tank, and which is housed in said tubular body ( 6 ) and carried by said removable cover body ( 25 ); wherein said feed valve is located close to said first end portion, said cap also comprising a monostable valve ( 27 ) controlled by said dipstick ( 26 ), wherein said feed valve comprises a lateral opening ( 13 ) formed through said tubular body, said opening ( 13 ) extending in such a position as to have a passage portion unaffected by the oil and located above the maximum oil level ( 21 ) in the tank, said feed valve further comprises a movable flap ( 15 ) closing said opening, said movable flap is hinged to said tubular body to rotate about a hinge axis ( 18 ) perpendicular to an axis ( 7 ) of said tubular body, and said hinge axis extends above the oil level in said tank.