The filler neck of a fuel tank with an arrangement for preventing
incorrect fueling has a rotatable ring and closing elements which are
actuated by said ring, with a transmission device having the following
features being arranged between the movable part and the rotatable ring:
there are two slides which are situated opposite one another and which
have run-on faces which face toward one another in the support body, the
two slides are connected to one another by means of a rigid bar, which
rigid bar is movably articulatedly connected with its first end to the
first slide and with its second end to the second slide, the second end
of the bar is a bolt which engages into a first slot of the second slide
and into a second slot of the rotatable ring.