Head for fuel filler pipe provided with an obturating assembly

A head for a fuel filler pipe of a vehicle tank provided with an obturating assembly comprising:

• a body having an aperture for passage to said pipe, of a fuel supply spout;
• and
• an obturator pivoting relative to said body between an obturating position in which it conceals said passage aperture and a freeing position in which it does not conceal said passage aperture, said obturator being elastically biased towards said obturating position by spring means, said obturator being adapted to be driven by said spout from the obturating position to the freeing position when said spout meets said obturator (during a thrusting movement of said spout into said head, said obturator comprising a seal disposed, in said obturating position, between said obturator and a sealing seat that said body comprises, said head comprising a hinge for pivotally mounting said obturator on said body, characterized in that the relative positioning between said seat and the pivotal axis defined by said hinge is fixed, said seat being flat and said obturator comprising a plug provided with said seal and a flap mounted on said body by means of said hinge and biased by said spring means with said plug which is mounted on said flap by virtue of ball joint means.