US 1307195 A
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J. F. GARDNER. PNEUMATIC FOUNTAIN PEN.
FILED APR.29,'I9I8. RENEWED MAY I, l9 I9- Patented June 17, 1919.
APPLICATION IIIIIIIIIIIIIIII INVEN TbR. Jcp/I Gah/nr.
- tainpens-in which the .srATEs orricn.
JOSEP F. 611mm, 1mm CITY, nussonm.
Specification of ietters'latent. l- 'atented J 11113 17 1919,
, App1ication flkdApril,2 Q, 1918, Serial No. 231,305. Renewed lay 1,1919. Serial No. 294,095.
To all 'whom it may 0mm:
Be it known'thatI, Josnrrr F. GARDNER, a citizen of'the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have inventeda new and useful Pneumatic Fountain-Pen, of which the following is a specification.
My invention relates to pneumatic founavit of the fluid is retarded by air, and t eQob ect of my invention is to. provide a simple and efiicient.
fountain pen-which shall automatically and light or heavy writing, drawing or marking, to-obtain uniform shade of ink in the writing, drawing or marking, and to provide a fountain with capacity for a body of fluid having gravity to crowd confined air to obtain high sensibility in the en.
.I attain these objects an other advantages by the mechanism and combination of parts illustrated in the accompanying drawing, in -which Figure 1, is a perspective view of a fountain en combining my invention, and shown t e fountain at the upper. end .of the pen;
ig. 2, is a sectional view of the pen, taken on the line 2--2, in Fig. 1, and showing my complete invention;
Fig. 3, is a transverse section of the same, taken on the line 33, in Fig. 1;
Fig.- 4, is a transverse section of the same,
neck 2,- hermetically' secured in a cup 3,
formed in-the upper end of a fitting 4, the
lower end portion of the fitting being reduced a little and provided with external screw threads adapted to receive the internal screw threads at the upper end of a hard rubber tube 5. A hole is bored longitudinall through the fitting and o ens through the b0 I upper end of a small flexible tube 6, is secured. The lowerend'; of the tube 5, is provided with internal screw threads adapted to receive the screw end of a hard rubber tube 1 A plug 8, is hermetically secured n the upper end of the tube 7 and a hole-1s ttom of the cup 3, in .w ich hole the .apertured through the plug, in which hole a small flexible tube 9, is secured by its upper end, The inner diameters (if the tubes 6 and 9, are dimensioned to limit their capacity, 1
so that fluid ink shall gravitate from the fountain through the same in very limited quantity. The tubes 6 and 9, are extended downwardly in theirrespective chambers to a suitable distance below the middle of the chambers, so, that when fluid ink in the chambers shall rise above the lower ends of the tubes, the air in the chambers will be confined and crowded upward by the gravityv of the fluid ink until the contending forces cple a suitable distance to support the pen point. A channel 14, is formed longitudinally in the upper'surface of the plug 13, the outer end of the channel-terminating at a point substantially below the opening in the pen point, the inner end thereof openlng into tube 7. The capacity of the channel 14, is preferably limited to the identical'capacity of the small tubes 6 and 9. All joints and connections are made absolutely air tight, so that the fountain 1, the chamber 15, in tube 5,-and the chamber 16, in tube 7 w1ll not communicate with atmosphere when the pen is operative. e
' To operate my pen, the bulb or fountain 1, is removed from the pen by unscrewing it from the tube 5, and the tube 6, immersed into a supply of fluid ink, when the bulb is pressed lnward and the pressure released the fluid will be sucked into the bulb, in the well known manner. The fountain is then air tight. The .pen is held vertical or inclined and the fluid gravitates from the fitting, through the tube 6, into the chamber it is detained by the pen point 11, when the latter is operative position. The fluid attached to the pen, the fitting being made p 15;..and thence through the tube 9, into the a chamber 16, and thence through the channel '14, in the plug 13,- in the nipple 10, where then rises in the chamber 16, to above the outlet' of tube 9, and, thereafter risesuntil the gravity of the fluid and the pressure oi the confined air in the chamber, above the fluid, are equalized. The fluid then rises in the chamber 15, above the outlet of the tube 6,'.and, thereafter, rising until the gravity .of the fluid and the pressure of the confined air in the chamber,v above the liquid, are equalized. The pen is then operative. and
may be used in the customary manner. of
fountain pens. When the pen point yields to the pressure of the operator, the fluid in the channel 14, oozes along the'pen point and wastes in the usual manner, the waste being immediately and instantaneously supplied by the fluid in 'chamber;16,the latter being replenished from the fluid in chamber -15, and it in turn replenished by the fluid in the fountain. The contending forces involved in gravitation of the fluid and the back pressure of the air in the chambers provide exe treme sensitiveness to' the waste of the fluid and automatic restoration of equilibrium in the contending forces. The fluid wasted at the pen point may be in greater or less degree, as in' the case of'light' or heavy writing, the loss being automatically and 'instantaneously supplied by the fountain in the manner described.
Having described my invention what I claim is- A pneumatic fountainpen, consisting of a. fountain having a body of fluid therein, a ventless chamber associated with said fountain and havinga fluid body therein and provided with aduct communicating with the fountain, the lower end of said duct being normally immersed in the fluid in the chamber to subject the air in the chamber to the pressure of the fluid,=a ventless chamber associated with said first mentioned chamber and having a fluid'body therein and provided with a duct communicating with the first mentioned chamber, the lower end of said duct bein normally immersed in the fluid in the chamier to subject-the air in the chamber to the pressure of the fluid in the first mentioned chamber, a nipple associated with said last mentioned chamber and hav-' ing a channel communicating with said last mentioned chamber, and 'a pen point supportingly engaged by said nipple and adapted to yield to Waste the fluid in the fountain en. p Kansas City, Mo., April 22nd, 1918.
' JOSEPH F. GARDNER. Witnesses:
A. C; MILLER.