Touch Down

Filling systems

The loading system called Touch Down by the company itself was introduced by Sheaffer in 1949 for the homonymous models, and is nothing more than a more sophisticated reworking, carried out after twenty-five years (patent nº US-2610612), of the Chilton pneumatic filler system (whose patent, nº US-1528379, is mentioned explicitly). In fact, the operating principle is essentially identical, what changes is the way in which the pneumatic compression of the rubber sac inside the pen is carried out.

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.

Brevetti correlati

• Brevetto n° US-1607048, del 1926-11-16, richiesto il 1925-07-18, di Edward Bergquist, Unbranded. Sistema di caricamento.

• Brevetto n° US-2610612, del 1952-09-16, richiesto il 1949-03-11, di Lynn P. Martin, W. A. Sheaffer Pen Company. Caricamento Touch Down.