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The ''button filler'' was introduced by [[Parker]] in 1913.<ref>at least as reported on [http://www.parkerpens.org/luckycurve.html this story] of the initial [[Parker]] models, the first [[Parker]] patents related to loading, {{Cite patent|US|1346045}} and {{Cite patent|US|1486246}}, are respectively from 1919 and 1922, certainly after the introduction, since the [[Duofold]] is also from 1922 and the system also appears in this 1916 [[:File:1916-11-Parker-LuckyCurve.jpg|advertising]], in [http://www.fountainpennetwork.com/forum/index.php/topic/250375-walker-davison-eyedropper/ this discussion] however is reported the purchase by the [[Parker]] of the patent {{Cite patent|US|787152}}, which is from 1905.</ref> The system was born from the need to find an alternative to the [[Sheaffer]] [[lever filler]] not copying the design thus avoiding all possible legal problems due to patents.

<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''button filler'' was introduced by [[Parker]] in 1913.<ref>at least as reported on [http://www.parkerpens.org/luckycurve.html this story] of the initial [[Parker]] models, the first [[Parker]] patents related to loading, {{Cite patent|US|1346045}} and {{Cite patent|US|1486246}}, are respectively from 1919 and 1922, certainly after the introduction, since the [[Duofold]] is also from 1922 and the system also appears in this 1916 [[:File:1916-11-Parker-LuckyCurve.jpg|advertising]], in [http://www.fountainpennetwork.com/forum/index.php/topic/250375-walker-davison-eyedropper/ this discussion] however is reported the purchase by the [[Parker]] of the patent {{Cite patent|US|787152}}, which is from 1905.</ref> The system was born from the need to find an alternative to the [[Sheaffer]] [[lever filler]] not copying the design thus avoiding all possible legal problems due to patents.

[[Image:ButtonFillerSchema.svg|center|500px|Diagram of a pen with ''button filler'']]

[[Image:ButtonFillerSchema.svg|center|500px|Diagram of a pen with ''button filler'']]

Nevertheless, the system was quite successful and was reused by various European manufacturers. In particular, an interesting variant is the ''[[push-knob]]'' made by [[Montblanc]], in which the blind cap itself serves as a button. In fact, it can be partially unscrewed until it is brought into a position where the internal button on which the metal spring is anchored is hooked, pressing the blind cap compresses the spring and loads the pen. Once filling is complete, the blind cap can be returned to the locked position to avoid accidental pressure.

Nevertheless, the system was quite successful and was reused by various European manufacturers. In particular, an interesting variant is the ''[[push-knob]]'' made by [[Montblanc]], in which the blind cap itself serves as a button. In fact, it can be partially unscrewed until it is brought into a position where the internal button on which the metal spring is anchored is hooked, pressing the blind cap compresses the spring and loads the pen. Once filling is complete, the blind cap can be returned to the locked position to avoid accidental pressure.

Un'altra variante è quella brevettata dalla [[Soennecken]] nel 1930, che prevede un pulsante di ebanite nascosto da un guscio ruotando il quale si può raggiungere il pulsante di caricamento ed azionarlo, mentre ruotandolo in direzione inversa questo viene riportato nella posizione originale, bloccando l'accesso al pulsante. Entrambe le varianti consentono di ovviare ad un altro non trascurabile problema della versione classica, che è la non trascurabile probabilità di perdere il fondellino svitabile.<noinclude>

Another variant is the one patented by [[Soennecken]] in 1930, which provides for an ebonite button hidden by a shell by rotating which you can reach the loading button and operate it, while rotating it in the reverse direction this is returned to the original position, blocking access to the button. Both variants make it possible to overcome another not insignificant problem of the classic version, which is the not insignificant probability of losing the blind cap.<noinclude>

==Note==

==Notes==

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==Brevetti correlati==

==Related Patents==

{{ListaBrevettiFeature|Button filler}}

{{ListsPatentsFeature|Button filler}}

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