Vacumatic filler

Versione del 8 set 2019 alle 23:26 di Piccardi (discussione | contributi) (Creata pagina con "This mechanism has the advantage of having a shorter bottom, which makes the appearance of the pen more pleasant, this was even more evident in the first versions of the syste...")
Filling systems

Introduced by Parker in 1933 with the launch of the Vacumatic model, it was advertised as the first rubber sacless filling system. In fact this is absolutely not true (a classic example of misleading advertising) both because at the time there were already several versions of rubber sacless filling systems, such as the plunger filler of Onoto and the piston filler of Pelikan, or because in reality the filling always relies on a flexible rubber element, the diaphragm, even if this does not perform the functions of a tank.

Among the various filling systems based on the use of a breather tube, the Vacumatic is certainly one of the most complex, but in reality it is only a reworking of the mechanism of the previous bulb filler in which instead of using a pump the compression of the air in the body of the pen is done through the movement of a rubber membrane, the diaphragm precisely. In this case the movement is made by pressing a spring button on the bottom of the pen, which acts on the mechanism that moves the membrane. Repeating the pressure several times results in the same pumping result as a normal rubber pump.

This mechanism has the advantage of having a shorter bottom, which makes the appearance of the pen more pleasant, this was even more evident in the first versions of the system, called "lockdown", in which the button, made with a metal cylinder with a lateral groove, could be kept in pressed position thanks to the presence of a "L" shaped end of the groove itself, which allowed it to be attached to the mechanism by a rotation, so then to allow the closure of the back itself (screw).

Del sistema venne prodotta, a partire dal 1937, una seconda versione denominata "speedline", in cui la realizzazione era semplificata eliminando il sistema di bloccaggio. Questo comportava un fondello più lungo, ma venne pubblicizzato per la possibilità di effettuare il riempimento con una sola mano (in realtà per svitare il fondello se ne usano comunque due). Dal 1942 circa il sistema venne ulteriormente revisionato (con la versione chiamata "wartime" dai collezionisti) usando un pulsante in celluloide anziché in alluminio.

Brevetti correlati

  • Brevetto n° US-1596811, del 1926-08-17, richiesto il 1925-05-23, di Albert Craig, Wahl Eversharp. Sistema di caricamento.
  • Brevetto n° US-1966369, del 1934-07-10, richiesto il 1934-02-13, di Steven G. Yates, David Kahn, Wearever. Sistema di caricamento.
  • Brevetto n° US-1989990, del 1935-02-05, richiesto il 1933-08-24, di Charles R. Keeran, Wahl Eversharp. Sistema di caricamento.
  • Brevetto n° US-1990441, del 1935-02-05, richiesto il 1933-04-17, di Albert H. Stenersen, Wahl Eversharp. Sistema di caricamento.
  • Brevetto n° DE-682506, del 1939-10-16, richiesto il 1937-02-12, Osmia. Sistema di caricamento.