US2136371A - Fountain pen - Google Patents

Description

. Nov. 15, 1938. L A, R KE 2,136,371

FOUNTAIN PEN Filed Oct. 2, 1936 Patented Nov. 15, 1938 UNITED TATES- PATENT OFFICE- i 2,136,371 FOUNTAIN- PEN Lloyd A. l3rooke, Washington, D. C; lapplication october 2, 1936, Serial No. 103,760

' f4 Claims. (01. 120- 50) The invention relates to a new and unique method or principle in the construction and op-' eration in the simplest form possible, of an operatable, perfectly performing fountain pen, carrying a very large volume ofink. I

' The means by which this new and unique methd 'of controlling a very much larger volume of ink in the ink chamber of a fountain pen than has been here-to-fore possible, consists generally of:

A feed plug, the-drum like shaped head of which is cylindrical with'a fiat or concave top; theheight and diameter of which, in its proper relation to the side wall of the barrel ink chamher is such, that it provides around the cylindrical head of the feed plug, a circular canal open at the top, and continuously'filled with ink by the ink chamber; but so stably controlled by the height and diameter of the cylindrical feed plug head in its relation to the side wall of the barrel ink chamber, that the air pressure and the head of the very large volume of liquid in the ink chamber is so controlled by the canal mentioned as to provide and allow a steady flow of inkat a low pressure to the longitudinal feed duct, in the feed plug, leading from this canal through the cylindrical wall of the feed plug to the pen point, and may be used to the last drop of ink in the ink chamber without flooding.

By this proper adjusted construction of the height and diameter of the cylindrical head of the feed plug to the side wall of the barrel ink chamber, any practical large body of ink can be perfectly controlled so as to prevent flooding. The practical limit is that ink volume that does not make the pen tooheavy for the writer to use comfortably.

The invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a sectional elevation of the pen, in the closed position.

Fig. 2 is a cross section of the pen with cap removed, the section being taken on the line 2-2 of Fig. 1.

A practical embodiment of the invention is disclosed in the drawing, in which similar numerals of reference indicate corresponding parts throughout the several views as follows:-|

The barrel I, ink chamber, may or may not be formed of a transparent material. The writing end of the barrel l is externally threaded to receive the cap 2 and is internally threaded to receive the connection 6 or, the joint may be made by friction and secured by any suitable means.

The connection 6 is, in general, of the usual form and carries the feed-plug which acts in the usual manner to support and carry the pen point nib '8 and is of the usual shapeadjacent to the nib. The feed-plug I is fitted with the conventional rectangular ink feed-duct 9 having two or more narrow canals ID, as required, ending at the'nib end in the usual manner at l2. The duct 9 at its upper end terminates in the vertical wall at I3 of an enlarged cylindrical head l4 on the upperend of the feed-plug I. The head [4 is seated on the connection 6 at I5-and is of a diameter such as to form a canal [6 with the inside of the barrel or ink chamber, of comparatively small surface area. The head l4 must be designed of the proper height and diameter in l5 relation to the side wall of the barrel, ink chambar, to meet the desired conditions and is fitted with-a flat or concaved top at IT. As an example for a pen designed to hold an ink column of five inches in height the height of the head should be about five-sixteenths of an inch from shoulder 13 to top of head; the canal l6 between the head [4 and the wall of the barrel I may vary from about one and one-half hundredths of an inch up to about three hundredths of an inch in width with satisfactory results.

The arrangement thus formed, creates a method whereby larger ink volumes, here-to-fore found impossible to provide and operate properly, can be supplied, supported, and give 'a smooth continuous perfect performance. This method of control of the large volume of ink is unique in that it allows the handling of a head up to (5) five inches in height with a capacity of at least (6) six cubic centimeters, more ink than could be carried in the largest practical sized pen, as well as allowing the use of the last drop of ink with perfect'performance. The friction set up in the small canal of liquid at IS; the arrangement of the duct end at l3; the 40 enlarged properly designed head l4, and the capillary attraction in the rigid side walls of the barrel or ink chamber, combined, react and overcome sufliciently the action of the ink head and the pressure due to the necessary air space 45 above the maximum ink height, including any increase in air pressure due to the warmth of the writers hand.

From the foregoing description taken in connection with the accompanying drawing it is 50 thought the construction, operation and advantages of the invention over those of the prior art will be apparent to those, skilled in the art.

What I claim is:

1. In a fountain pen, a barrel having an ink 65 chamber, a feed plug immovably held in one end of said barrel, a pen nib held in place by said plug, said plug having a cylindrical head of a greater diameter than that of the body of the plug and being located within the barrel the side wall of which head is approximately parallel to the adjacent wall of the barrel and spaced slightly therefrom to leave an annular capillary space between the plug and the barrel, said plug having a duct with canals, the outer end of which duct terminates adjacent said nib and the inner end of which duct opens through the side only of said head into said capillary space below the top of said head.

2. In a fountain pen, a barrel having an ink chamber, a feed plug immovably held in one end of said barrel, a pen nib held in place by said plug, said plug being composed of a body having a cylindrical head located in the ink chamber, the adjacent wall of the barrel surrounding said head being also cylindrical and being spaced from the adjacent wall of the head a relatively slight distance thereby forming with the head an annular capillary space alongside the head from one end thereof to the other, said plug having a duct along its upper side with canals whose outer end terminates adjacent said nib and whose inner end terminates in an opening through the top side of the head only adjacent the outer end of the head.

3. In a fountain pen, a barrel having an ink chamber of relatively large capacity, a tubular member having a bore of lesser diameter than that of the barrel and having one end shouldered and threaded into the outer end of the barrel, a feed plug comprising a body of two diameters, that part of lesser diameter constituting a shank fitted immovably in said tubular member and that part of greater diameter constituting a head the side wall of which is cylindrical and extends into the outer end of the barrel in close proximity thereto throughout the length of said head thereby to provide an annular capillary space, a pen nib held in place by said plug, said plug having a duct along its top side, with canals, whose outer end terminates adjacent said nib and whose inner end terminates at the commencement of said head, said head having a side opening only adjacent the inner end of said portion of lesser diameter and registering with said duct.

4. In a fountain pen, a barrel having an ink chamber of relatively large capacity, a tubular member having a bore of lesser diameter than that of the barrel and having one end shouldered and threaded into the outer end of the barrel, 2, feed plug comprising a body of two diameters, that part of lesser diameter constituting a shank fitted immovably in said tubular member and that part of greater diameter constituting a head the side Wall of which is cylindrical and extends into the outer end of the barrel in close proximity thereto throughout the length of said head thereby to provide an annular capillary space, a pen nib held in place by said plug, said plug having a duct along its top side, with canals, whose outer end terminates adjacent said nib and whose inner end terminates at the commencement of said head, said head having a side opening only adjacent the inner end of said portion of lesser diameter and registering with said duct, the crosssectional area of said duct being greater than the width of the capillary space measured from the outside of the head to the adjacent inside surface of said barrel.

LLOYD A. BROOKE.

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