Patent ID: 6905040

Claim:
A filler device having a filler neck ( 23 ) and a closure cap ( 1 ), the closure cap ( 1 ) having an engagement segment ( 4 ), the engagement segment ( 4 ) and filler neck ( 23 ) each having complementary engagement elements ( 7 , 8 , 25 , 26 ), which can be brought, by movement of the closure cap ( 1 ) with respect to the filler neck ( 23 ), from an initial position into a final position, a locking device ( 13 , 14 ) operably associated with and preventing the closure cap ( 1 ) from falling off which generates a resistance to movement in a movement region of the closure cap ( 1 ), the movement region comprising an axial path for the closure cap ( 1 ) to the initial position, and from the initial position a circumferential path to the final position, characterized in that the locking device ( 13 , 14 ) is effective at a region of transition from the axial path to the circumferential path, said locking device increasing the resistance to movement of the closure cap when said engagement elements are within said region of transition when bringing said closure cap with respect to said filler neck from either the initial position into the final position or the final position into the initial position.