Differenze tra le versioni di "Levetta di fondo/en"
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<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''bottom lever filler'', also called ''rear lever filler'', is a special lever filling system designed by [[Aurora]] and used from around 1930 for the [[Internazionale]] model, and later used also on the [[Novum]]. There are no known variants of this system used by other manufacturers, even if there are several patents with similar mechanisms, except the [[switch filler]] of the [[Pilot]], which has some similarities, in particular with the variant of this system adopted later on the [[Superna]] model. | <noinclude>{{ReferBox|Filling systems}}</noinclude>The ''bottom lever filler'', also called ''rear lever filler'', is a special lever filling system designed by [[Aurora]] and used from around 1930 for the [[Internazionale]] model, and later used also on the [[Novum]]. There are no known variants of this system used by other manufacturers, even if there are several patents with similar mechanisms, except the [[switch filler]] of the [[Pilot]], which has some similarities, in particular with the variant of this system adopted later on the [[Superna]] model. | ||
[[Image:levetta di fondo.jpg|thumb|250px|Diagram of a pen with ''bottom lever filler'']] | [[Image:levetta di fondo.jpg|thumb|250px|Diagram of a pen with ''bottom lever filler'']] | ||
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In essence the ''bottom lever filler'' creates a sort of combination between the principle of the lever and the mechanism used in the [[button filler]]. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the [[button filler]], which arching compresses the sac. | In essence the ''bottom lever filler'' creates a sort of combination between the principle of the lever and the mechanism used in the [[button filler]]. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the [[button filler]], which arching compresses the sac. | ||
Versione delle 20:41, 10 mag 2020
| Filling systems |
The bottom lever filler, also called rear lever filler, is a special lever filling system designed by Aurora and used from around 1930 for the Internazionale model, and later used also on the Novum. There are no known variants of this system used by other manufacturers, even if there are several patents with similar mechanisms, except the switch filler of the Pilot, which has some similarities, in particular with the variant of this system adopted later on the Superna model.
In essence the bottom lever filler creates a sort of combination between the principle of the lever and the mechanism used in the button filler. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the button filler, which arching compresses the sac.
The system is rather complex and delicate (given the small size of the lever the efforts to be applied are greater), and to avoid deforming the body of the pen Aurora inserted a reinforcement inside the same (made with a thin metal cylinder of aluminum inserted on the inner surface) that further reduces the space available for the sac.
The mechanism allows to avoid the presence of the blind cap of the button filler, and the related problems of loss, at the cost of a certain mechanical complexity. Its main purpose, apart from distinguishing itself from other manufacturers, however, it is mainly to aesthetically pleasing avoiding a gap on one side of the pen.
A variant of the system, also introduced by the Aurora with the Superna model, involves the mounting of the bottom lever in a vertical position; the lever is mounted inside an aluminium structure inserted in the bottom of the pen, which takes care to absorb the stresses. The lever emerges from a hemispherical shaped dome and can be operated by means of a plastic ball placed on the external end. In this case, the mechanism is accessed by unscrewing the bottom blind cap and charging the pen by pushing the lever through the ball.
Related Patents
- Patent n° GB-273357, of 1927-06-07, requested on 1926-02-05, of Lionel Gunsberg, Emanuel Feldorf, Lang - Curzon - Summit, W. J. May and Co.. Improvements in and relating to Fountain Pens.
- Patent n° FR-628272, of 1927-06-07, requested on 1926-02-05, of Lionel Gunsberg, Emanuel Feldorf, Lang - Curzon - Summit, W. J. May and Co.. Perfectionnements apportés aux porte-plumes à réservoir ou à remplissage automatique.
- Patent n° GB-297194, of 1928-09-20, requested on 1927-08-06, of Arthur Stanley Jones, Conway Stewart. Improvements in or relating to Fountain Pens.
- Patent n° US-1733780, of 1929-10-29, requested on 1927-05-14, of Frank C. Deli, William D. Groseclose, Autopoint. Filling device for fountain pens.