Sleeve filler

The sleeve filler, also called thumb filler, is one of the many filling systems experimented at the beginning of '900, in particular it was adopted by Holland around 1905 and by Waterman that used it from 1910 to 1915. This loading system is based on the displacement of a sleeve that wraps the barrel of the pen to hide a large opening made on one side of it. Moving the sleeve, which protects the opening, gives direct access to the pressure bar (on which a relief button was usually mounted at the opening), which can be so pressed using the fingertips.

The presence of the sleeve that wraps around the barrel at the opening, however, makes the size of the body of the pen uneven, which are therefore often unpleasant from an aesthetic point of view. Moreover, the mechanical complexity of the pen and its general fragility are greatly increased, since the pens of that period were made from hard rubber, a material not particularly resistant to mechanical stress. For this reason this filling system had a reduced diffusion and was soon abandoned.

A second version of this filling system, much more sophisticated, was adopted by LeBoeuf in 1930. In this case it didn't have a sleeve, but it was the whole barrel of the pen (made this time in celluloid) that could be unhooked from the nib group, sliding on an inner cylinder made of metal, on which there was lateral opening for the direct pressure on the sac. In this case, a uniform cylindrical shaft was obtained that had no lists, not even for the housing of the lever.

In una forma simile, almeno sul piano estetico, questo sistema di caricamento venne adottato anche dalla Parker per l'aerometric usato nella 51 (che però prevede pressioni multiple per la presenza di uno sfiatatoio), mentre un sistema sostanzialmente identico viene utilizzato ancora oggi da alcuni converter (ad esempio quelli delle stilografiche Pilot di fascia bassa).

Brevetti correlati

• Brevetto n° US-428969, del 1890-05-27, richiesto il 1889-04-29, di Norman C. Stiles, Unbranded. Sistema di caricamento.

• Brevetto n° US-781649, del 1905-02-07, richiesto il 1904-05-20, di Robert H. Hamilton, Eclipse. Caricamento sleeve filler.

• Brevetto n° US-784528, del 1905-03-14, richiesto il 1903-12-24, di Thomas P. Ambrose, Hicks. Caricamento sleeve filler.

• Brevetto n° US-794836, del 1905-07-18, richiesto il 1905-04-01, di Thomas P. Ambrose, Hicks. Caricamento sleeve filler.

• Brevetto n° US-799897, del 1905-09-19, richiesto il 1905-03-24, di William I. Ferris, Waterman. Caricamento sleeve filler.

• Brevetto n° US-800129, del 1905-09-19, richiesto il 1905-01-18, di Robert W. Gorham, Good Pen Co. Caricamento sleeve filler.

• Brevetto n° US-807500, del 1905-12-19, richiesto il 1905-05-09, di William W. Sanford, Sanford and Bennet. Caricamento sleeve filler.

• Brevetto n° US-818803, del 1906-04-24, richiesto il 1905-06-08, di Otto E. Weidlich, Weidlich. Sistema di caricamento.

• Brevetto n° US-821940, del 1906-05-29, richiesto il 1906-02-17, di John A. Holland, John Holland Pen Company. Caricamento sleeve filler.

• Brevetto n° US-828973, del 1906-08-21, richiesto il 1905-10-10, di William W. Sanford, Sanford and Bennet. Caricamento sleeve filler.

• Brevetto n° US-879296, del 1908-02-18, richiesto il 1907-08-19, di Frank H. Mooney, C. E. Barret & Company, Mooney. Caricamento sleeve filler.

• Brevetto n° US-950817, del 1910-03-01, richiesto il 1909-08-23, di William I. Ferris, Waterman. Caricamento sleeve filler.

• Brevetto n° US-1019930, del 1912-03-12, richiesto il 1911-06-16, di Francis W. Vaughn Jr., Henry J. Upton, Vaughn-Upton. Caricamento sleeve filler.

• Brevetto n° US-1038068, del 1912-09-10, richiesto il 1912-02-16, di George F. Barrett, Unbranded. Caricamento sleeve filler.

• Brevetto n° US-1042695, del 1912-10-29, richiesto il 1912-04-20, di James W. Laughlin, Laughlin. Caricamento sleeve filler.

• Brevetto n° US-1042804, del 1912-10-29, richiesto il 1912-02-09, di James W. Laughlin, Laughlin. Caricamento sleeve filler.

• Brevetto n° US-1051670, del 1913-01-28, richiesto il 1912-06-10, di Claes W. Boman, Eagle. Caricamento sleeve filler.

• Brevetto n° US-1078513, del 1913-11-11, richiesto il 1911-07-08, di George S. Parker, The Parker Pen Company. Caricamento sleeve filler.

• Brevetto n° US-1124592, del 1915-01-12, richiesto il 1913-11-17, di Henry R. Coit, Coit Ready Fill Pen Company. Caricamento sleeve filler.

• Brevetto n° US-1169603, del 1916-01-25, richiesto il 1911-11-04, di David W. Beaumel, Beaumel. Caricamento sleeve filler.

• Brevetto n° GB-191516665, del 1916-10-12, richiesto il 1915-11-25, di Cecil Bristow, Swan. Sistema di caricamento.

• Brevetto n° US-1247169, del 1917-11-20, richiesto il 1917-02-16, di Frederic E. Storer, Sterling Fountain Pen. Caricamento sleeve filler.

• Brevetto n° US-1307630, del 1919-06-24, richiesto il 1916-11-14, di William A. Haskins, Unbranded. Caricamento sleeve filler.

• Brevetto n° US-1804522, del 1931-05-12, richiesto il 1929-07-03, di Frank T. Walsh, LeBoeuf. Caricamento sleeve filler.

• Brevetto n° US-1851257, del 1932-03-29, richiesto il 1930-05-03, di Eugene Le Boeuf, LeBoeuf. Caricamento sleeve filler.

• Brevetto n° US-2148853, del 1939-02-28, richiesto il 1938-04-26, di Homer J. Bessette, LeBoeuf. Caricamento sleeve filler.

• Brevetto n° FR-1020261, del 1953-02-04, richiesto il 1950-06-15, di George Shey, Unbranded. Sistema di caricamento.