Patent ID: 8746298

Claim:
A cap-free closeable neck for a filler neck of a tank of a motor vehicle, comprising: a pipe section; a lower sealing flap arranged in the pipe section; a closing mechanism arranged above the lower sealing flap, wherein the closing mechanism comprises: an upper filling opening; and an upper cover, which in a closed state at least partially covers the upper filling opening and being embodied in such a manner that the upper cover is displaced by inserting an outlet pipe of a fuel nozzle into the upper entry space for releasing the upper filling opening so as to allow for the insertion of the outlet pipe through the upper filling opening and the lower sealing flap and wherein for forming a protection against a filling with unsuitable fuel, the upper cover, in its closed state, is blocked by at least a first locking element and a second locking element and wherein the first locking element and the second locking element are embodied in such a manner that they are unlocked as a function of a type-specific shape of the outlet pine of the fuel nozzle, only when the tank is filled with suitable fuel, whereby the first locking element and the second locking element are formed by blocking devices, which are mounted in such a manner that the blocking devices are displaced by the outlet pipe for unlocking the upper cover out of a blocking position; and wherein the first locking element and the second locking element are arranged at a distance (a) to one another, wherein the distance (a) is so large that the first locking element and the second locking element are unlocked by the outlet pipe of the fuel nozzle comprising a first diameter, in particular a fuel nozzle for diesel fuel, while at most the first locking element is unlocked by a second fuel nozzle comprising a second diameter, which is smaller relative to the first diameter, and wherein each of the first locking element and the second locking element comprises a locking pin that engages with a recess in the upper cover in a positive manner and which is displaced laterally or downward against a force of a safety spring through a free end of the outlet pipe, wherein, upon completion of displacement of the locking pin, engagement of the locking pin with the recess of the upper cover is overridden.