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Also in this case there is an unscrewable bottom that is hooked to a metal cylinder that slides hermetically thanks to a gasket along the body of the pen, the mechanism is however much more complex to avoid the use of the ventilation hole on the bottom of the pen and allow compression only by pushing down the tube anchored to the bottom once you have extracted it.  

Also in this case there is an unscrewable bottom that is hooked to a metal cylinder that slides hermetically thanks to a gasket along the body of the pen, the mechanism is however much more complex to avoid the use of the ventilation hole on the bottom of the pen and allow compression only by pushing down the tube anchored to the bottom once you have extracted it.  

In questo caso la compressione avviene facendo passare l'aria nell'intercapedine attraverso non un foro sulla punta del cappuccio ma delle brevi scanalatura laterali alla due estremità del tubo interno. In fase di apertura le scanalature sul fondo consentono l'espansione del sacchetto, chiudendo il pistone lo scorrimento è a tenuta e l'aria interna comprime il sacchetto, a fondo corso le altre scanalature permettono all'aria di fuoriuscire e l'espansione del sacchetto carica l'inchiostro. <noinclude>

In this case, the compression takes place by passing the air in the cavity through not a hole on the tip of the cap but short lateral grooves at the two ends of the inner tube. When opening the grooves on the bottom allow the expansion of the bag, closing the piston the slide is sealed and the internal air compresses the sac, at the end of the course the other grooves allow the air to escape and the expansion of the sac loads the ink. <noinclude>

==Brevetti correlati==

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