US1739325A

US1739325A - Fountain pen

Info

Publication number: US1739325A
Application number: US213657A
Authority: US
Inventors: Pearson Thomas
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-08-17
Filing date: 1927-08-17
Publication date: 1929-12-10
Anticipated expiration: 1946-12-10

Description

' Dec. 10, 1929. T. PEARSON 1,739,325

FOUNTAIN PEN Filed Aug. 1'7. 192'? g 1 IINVENTOR V 1 THOMAS PEARSON I 1 ATTORNEY Patented Dec. 10, 1929 THOMAS PEARSON, OF SYRACUSE, NEW YORK FOUNTAIN PEN Application filed August 17, 1927.

My invention relates to a fountain pen, and

has for its general object to provide a founmerely illustrative of one example of the invention.

Figure 1 is a view partly in longitudinal section and partly in elevation, showing a fountain pen embodying my invention.

Figure 2 is a similar View with the cap removed and showing the position of the parts in filling the pen.

Figure 3 is a cross section on the line 33 of Figure 1. Figure 4 is an elevation of the filling plunger.

In carrying out my invention in practice in accordance with the illustrated example,

a barrel or hollow body 10 is provided to hold ink, said barrel having any approved pen holding means 11 adapted to receive a pen nib l2. Fitting snugly in the barrel 10 is a hollow plunger 13 which is adapted to have sliding movement in said barrel, drawing in ink by suction, owing to the fitof the plunger in the barrel. and adjacent to the head external threads 15 are adapted when the plunger is 1n the forward position to engage internal threads 16 formed in the barrel 10 at the rear or upper end. A vent hole 17 is formed in the tubular plunger 13 at the threads 15 so that when the threads 15 are engaged with the threads 16, the rear end of the barrel 10 will form a closure of the vent hole 17, as when the pen is in use.

The numeral 18 indicates the usual cap on fountain pens, which fits at its forward end on the

head

14, and 19 indicates the clip for holding the pen to the pocket.

In practice, to fill the pen, the plunger 13 is turned through the medium of the head 14 until the threads 15 are disengaged from the Said plunger has a head 14,

Serial No. 213,657.

threads 16, and thereby the plunger 13 may be reciprocated in the barrel 10. In filling the pen, a finger is placed over the vent hole 17 to close the same so that as the plunger 13 1s moved outwardly in the barrel 1O suction will be produced and ink be drawn into the barrel 10. Repeated filling movements of the plunger 13 may be made in accordance with the amount of ink desired to be drawn into the barrel. In moving the plunger 13 forwardly the vent hole 17 is uncovered so that the air in the vent hole and plunger may escape. The barrel first having been filled to the desired extent, the plunger 13 is moved inwardly and the vent hole 17 being open the ink will rise in the plunger 13, as indicated in Figure 1.

As best seen in Figure 4, an annular groove 120 is formed in the plunger 13 near the inner eiid to receive a packing ring 20 to increase the tightness of the fit of the plunger in the barrel 10. Also in the plunger 13 some distance from the inner end I produce an annular groove or grooves 21 in which any slight leakage past the packing ring 20 will be trapped and collected. Again, near the inner end of the plunger 13 I produce an auxiliary second hole 22 which, it will be observed, is additional to the vent hole 17. The hole 22 acts as an indicator whereby the one filling the pen may observe that the ink has risen to the hole 22. Said hole 22 is distant sufficient from the packing ring 20 so that the closure of the barrel 10 is not disturbed while the hole 22 is exposed above the rear or upper end of the barrel.

I would state furthermore that while the illustrated example constitutes a practical embodiment of my invention, I do not limit myself strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departure from the spirit of the invention as defined in the appended claim.

I claim:

In a fountain pen, a barrel adapted to receive ink, and a hollow plunger adapted to be reciprocated in said barrel and fitting snugly therein, said plunger having a vent hole adjacent the rear end adapted to be closed fordrawing ink into the barrel by a rearward movement of the plunger, said plunger furthermore having a second hole therein a sufficient distance from the inner end to permit of said second hole showing above the rear end of the barrel while the extreme end of the plunger is still in the barrel.

Signed at Syracuse in the county of Onondaga and State of New York this 12th day of August, A. D. 1927. a g 7 THOMAS PEARSON.