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The ''sleeve filler'', also called ''thumb filler'', is one of the many filling systems experimented at the beginning of '900, in particular it was adopted by [[Holland]] around 1905 and by [[Waterman]] that used it from 1910 to 1915. This loading system is based on the displacement of a ''sleeve'' that wraps the barrel of the pen to hide a large opening made on one side of it. Moving the sleeve, which protects the opening, gives direct access to the pressure bar (on which a relief button was usually mounted at the opening), which can be so pressed using the fingertips.  

<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''sleeve filler'', also called ''thumb filler'', is one of the many filling systems experimented at the beginning of '900, in particular it was adopted by [[Holland]] around 1905 and by [[Waterman]] that used it from 1910 to 1915. This loading system is based on the displacement of a ''sleeve'' that wraps the barrel of the pen to hide a large opening made on one side of it. Moving the sleeve, which protects the opening, gives direct access to the pressure bar (on which a relief button was usually mounted at the opening), which can be so pressed using the fingertips.  

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

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

A second version of this filling system, much more sophisticated, was adopted by [[LeBoeuf]] in 1930. In this case it didn't have a sleeve, but it was the whole barrel of the pen (made this time in celluloid) that could be unhooked from the nib group, sliding on an inner cylinder made of metal, on which there was lateral opening for the direct pressure on the sac. In this case, a uniform cylindrical shaft was obtained that had no lists, not even for the housing of the lever.  

A second version of this filling system, much more sophisticated, was adopted by [[LeBoeuf]] in 1930. In this case it didn't have a sleeve, but it was the whole barrel of the pen (made this time in celluloid) that could be unhooked from the nib group, sliding on an inner cylinder made of metal, on which there was lateral opening for the direct pressure on the sac. In this case, a uniform cylindrical shaft was obtained that had no lists, not even for the housing of the lever.  

In una forma simile, almeno sul piano estetico, questo sistema di caricamento venne adottato anche dalla [[Parker]] per l'''[[aerometric]]'' usato nella [[51]] (che però prevede pressioni multiple per la presenza di uno sfiatatoio), mentre un sistema sostanzialmente identico viene utilizzato ancora oggi da alcuni ''[[Caricamento#converter|converter]]'' (ad esempio quelli delle stilografiche [[Pilot]] di fascia bassa).<noinclude>

In a similar form, at least on an aesthetic level, this loading system was adopted also by the [[Parker]] for the ''[[aerometric]]'' used in the [[51]] (which, however, provides for multiple pressures for the presence of a breather), while a substantially identical system is still used today by some ''[[converter]]'' (for example those of the [[Pilot]] low end fountain pens).<noinclude>

==Brevetti correlati==

==Related Patents==

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{{ListsPatentsFeature|sleeve filler}}

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