Bulb filler

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Versione del 5 set 2019 alle 00:17 di Piccardi (discussione | contributi) (Creata pagina con "The filling principle derives from the dropper principle, the pen tip is immersed in the ink and the pump is pressed, its expansion causes a depression that causes the ink to...")
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Filling systems

The bulb filler is probably the progenitor of all filling systems based on the presence of a breather tubes. Its origins are uncertain, one of the oldest patents (nº US-802668 of 1905) was granted to the Aikin Lambert, but there is an earlier one (nº US-723726 of 1903) that does not seem to have been used. But beyond the precursors one of the first models to have been massively produced and marketed is certainly the one of the Postal of 1925, although the most sophisticated version probably remains that of the Stylomine 303. Later the same system was also adopted by Eversharp for the Bantam model and for the stenographer-centralist version by Doric, and by Pelikan for the Rappen.

The system involves the direct use of the pen barrel as a reservoir, also allowing, when this was made of transparent material, the visualization of the ink level. Filling is carried out by pressing a rubber pump, similar to that of a dropper, inserted directly on the bottom of the body of the pen, and which can be accessed by unscrewing the bottom of the pen. Given the need to have a pump of sufficient size, this generally involves on this type of pen a much longer blind cap than that used on other filling sistems, such as the button filler or the piston filler.

The filling principle derives from the dropper principle, the pen tip is immersed in the ink and the pump is pressed, its expansion causes a depression that causes the ink to flow into the body of the pen. The innovation created by this filling system consists of the presence of the breather tube connected to the nib unit and directly connected to a duct in the ventilation hole of the nib.

Questo fa sì che si possa ripetere la pressione sulla pompetta più volte, per effettuare diverse azioni di caricamento e riempire progressivamente la penna. In assenza dello sfiatatoio infatti, con la compressione della pompetta si farebbe fuoriuscire l'inchiostro presente nel corpo non essendovi sfogo per l'aria contenuta nello stesso, ottenendo così una capacità molto limitata; lo sfiatatoio fornisce invece una via d'uscita all'aria presente nel serbatoio che viene compressa dalla pompetta, ed una via di ingresso per l'inchiostro che viene risucchiato dalla depressione. Si può così ripetere la compressione della pompetta e continuare a caricare inchiostro fintanto che quest'ultimo non supera il livello dello sfiatatoio, riempiendo totalmente la penna.

Brevetti correlati

  • Brevetto n° US-1037660, del 1912-09-03, richiesto il 1912-01-10, di Felix Riesenberg, Unbranded. Sistema di caricamento.
  • Brevetto n° GB-191218716, del 1912-09-03, richiesto il 1912-09-12, di Felix Riesenberg, Unbranded. Sistema di caricamento.
  • Brevetto n° DE-264883, del 1913-09-29, richiesto il 1912-08-20, di Felix Riesemberg, Unbranded. Sistema di caricamento.
  • Brevetto n° FR-712327, del 1931-09-30, richiesto il 1930-06-12, di Yves Zuber, Stylomine. Sistema di caricamento.
  • Brevetto n° GB-374274, del 1932-06-09, richiesto il 1930-06-12, di Yves Zuber, Stylomine. Sistema di caricamento.
  • Brevetto n° US-2593082, del 1952-04-15, richiesto il 1947-04-15, di Fred D. Woods, Autopoint. Sistema di caricamento.