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Another noteworthy variant of the system is the one of [[Carter]], derived from a patent ({{Cite patent|US|1209978}}) of the [[De Witt-La France]], which has a sort of "leash" attached to the lever that prevents it from tipping over once it has reached the vertical position, in order to avoid damage to the pen and the system.

Another noteworthy variant of the system is the one of [[Carter]], derived from a patent ({{Cite patent|US|1209978}}) of the [[De Witt-La France]], which has a sort of "leash" attached to the lever that prevents it from tipping over once it has reached the vertical position, in order to avoid damage to the pen and the system.

Infine una particolare versione di riempimento a levetta è quello della [[Skyline]] della [[Eversharp]], che potrebbe essere classificato anche fra i [[Caricamento#Caricamento a sfiatatoio|caricamenti a sfiatatoio]]. In tal caso infatti all'interno del serbatoio in gomma si ha uno sfiatatoio, e la ''[[spring bar]]'' è molto corta e volta a comprimere soltanto la parte finale del sacchetto. La penna viene caricata ripetendo più volte l'azione di pressione con la levetta, usando il principio classico dello sfiatatoio. Analogo a questo, anche se realizzato in maniera completamente diversa, è l'''[[Ink-Vue]]'' della [[Waterman]].<noinclude>

Finally, a particular version is the one of the [[Eversharp]] [[Skyline]], which could also be classified as a [[Filling systems#Breather_tube_fillers|breather tube filler]]. In this case, in fact, inside the rubber sac there is a breather tube, and the ''[[spring bar]]'' is very short and aimed at compressing only the final part of the bag. The pen is loaded by repeating the pressure action several times with the lever, using the classic principle of the breather tube filler. Similar to this, even if realized in a completely different way, is the  [[Waterman]] ''[[Ink-Vue]]''.<noinclude>

==Brevetti correlati==

==Related Patents==

{{ListaBrevettiFeature|lever filler}}

{{ListsPatentsFeature|lever filler}}

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