US2766728A - Fountain pen - Google Patents

Fountain pen Download PDF

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Publication number
US2766728A
US2766728A US233291A US23329151A US2766728A US 2766728 A US2766728 A US 2766728A US 233291 A US233291 A US 233291A US 23329151 A US23329151 A US 23329151A US 2766728 A US2766728 A US 2766728A
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US
United States
Prior art keywords
ink
hollow member
transverse
air
nib
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US233291A
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English (en)
Inventor
Kovacs Theodor
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Individual
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Individual
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Publication date
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Publication of US2766728A publication Critical patent/US2766728A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K5/00—Pens with ink reservoirs in holders, e.g. fountain-pens
    • B43K5/18—Arrangements for feeding the ink to the nibs

Definitions

  • This invention relates to writing instruments, and more particularly to a fountain pen.
  • An object of the present invention is to provide a fountain pen equipped with means for the elimination of disturbances, which might be caused by the warming up of the air present in the ink reservoir or by changes in the atmospheric pressure, so that a uniform feed of the ink to the nib is assured.
  • Another object of the present invention is to provide a fountain pen, the capacity of which is higher rthan that of customary fountain pens.
  • a further object of the present invention is to provide a fountain pen which may be safely carried and used without danger of ink leakage.
  • Another object of the present invention is to improve on the art of fountain pens as now customarily made.
  • Fig. l is a fragmentary sectional view of the writing end of a fountain pen according to the invention.
  • Fig. 2 is a sectional view taken on line lI-ll of Fig. 1
  • Fig. 3 is a sectional view taken online lll-lll of Fig. l
  • Fig. 4 is a sectional view taken on line lV-IV of Fig. 1
  • Fig. is a sectional view taken on line V-V of Fig. l and Fig. 6 is a fragmentary elevational view as seen in the direction of the arrow Vl shown in Fig. l.
  • 1 generally indicates the barrel of a fountain pen provided with an end wall 2 at its writing end.
  • a hollow member 3 inserted into the interior of the barrel 1 divides the latter into an ink reservoir 4 above said hollow member 3 and a compartment surrounding said hollow member.
  • a projecting portion 5 of said hollow member 3 is inserted into a recess of the end wall 2 without clearance, by press lit, whereby this compartment is hermetically sealed towards the pen nib 7.
  • a stepped feed bar 6 carrying the pen nib 7 is inserted into coaxial bores of the end wall 2 and the member 3. Said feed bar 6 in conjunction with the hollow member 3 surrounding same form a feed structure.
  • the outer diameter 'of the upper portion (as viewed in Fig.
  • l) of the feed bar 6 is at the most .004" smaller than the inside diameter of the corresponding bore of the hollow member 3, so that a cylindrical ⁇ space 8 of merely a few thousandths of an inch, or even less, having a Ihigh capillarity, is provided for within the bore 'of said hollow member 3 around the feed bar 6.
  • rllhe feed bar 6 provided with an axial bore or air duct 9 having a mouth of reduced cross-section. At approximately one half of the length of the compartment the air duct 9 is connected, 'oy means of a first transverse bore 10 merging into a coaxial second transverse bore 11 of the hollow member 3, with a comparatively deep and wide longitudinal groove or air distributing channel 12 arranged at the nib-side of the hollow member 3.
  • the diameter of "ice said second -transverse bore 11 is substantially larger than the diameter of the first transverse bore 10, so that the highly capillary cylindrical space 8 is interrupted over .a comparatively large area around the first transverse bore 10.
  • the air distributing channel 12 extends over the entire length of above mentioned compartment.
  • the overflow chamber of the fountain pen comprises the capillary transverse chambers 13 arranged between lamellar partitions 14. These transverse chambers 13 extend from the nib-side of the core member 3 to a longitudinally extending portion or ridge 15 arranged at the opposite side of ⁇ said core member.
  • l is approximately .006 smaller than .the inside diameter of the compartment, so that arcuate capillary spaces 16 are formed between the wall of this compartment and the narrow cylindrical surfaces of the lamellar partitions 14, said arcuate capillary spaces 16 merging at their ends into parallel longitudinal capillary spaces 17 (see Fig. 3) extending between the longitudinal ridge 15 and the wall of this compartment, and said ilongitudinally extending capillary spaces 17 connecting the arcuate capillary spaces 16 arranged at different planes with each other.
  • An air channel 1S is arranged in the longitudinal ridge 15 at the side 'of the hollow member 3 opposite to the nib-side of the latte-r, said air channel 18 extending from an annular channel 19, arranged at the lower end (as viewed in Fig. l) of the overflow chamber and connected with the -air ⁇ distributing channel 12, to ra seo-ond annular channel 20 arranged beyond the overflow chamber in a rear portion All of the hollow member 3 .adjoining the rear end portion of the latter engaged with the barrel 1.
  • the annular channel 20 is connected by a 'short connecting channel 21 with the ink reservoir 4.
  • the cr-osssection of the air channel 18 is gradually reduced towards the upper end thereof (as viewed in Fig. 1).
  • the annular channel 20 being arranged eccentrically is reduced in size from the air channel 18 towards the connecting channel 21.
  • the capillary potential at the vertex of the annular channel 20 is larger than the potential lof the transverse chambers 13 in whatever position ⁇ the fountain pen may be.
  • Ink fissures 22 made as fine as possible are arranged at the bottom of the air channel 18. Unlike air channel 18, said ink fissures 22 extend to the ink reservoir 4.
  • These ink fissures 22 are connected with the capillary space 17 :and through the latter with the capillary spaces 16 by means of transverse ⁇ slits 23 lof the longitudinal ridge 15.
  • Transverse slits 23 are impermeable to air when they are in wet condition.
  • a capillary transverse slit 24 arranged above the overflow chamber at the nib-side of the hollow member 3 connects the spaces 16, 17 with the cylindrical space 8 of high capillarity.
  • the very fine ink fissures 22, transverse slits 23, 24 and :spaces 16, 17 are permanently filled with ink whereby a capillary ink-net extending over the entire overflow chamber is formed. Excess ink may flow from the ink-net along the corners 'always lled with some ink into the transverse chambers 13.
  • the cylindrical space 8 is connected with the nib-slit 26 of the pen nib 7 by means of feed fissures 25 (see Figs.
  • the ink flows from the ink reservoir 4 through the cylindricai space 8 of high capillarity and the tine ink fissures directly to the pen nib 7.
  • the entire ink conduit 8, 25 is of such a shape and design that the ink does not trickle out at any place and, consequently, there is no increase in the wetted cross-section of the conduit.
  • the capilllary potential of the ink conduit remains substantially at a constant maximum in the range of the overflow chamber.
  • the portion of the feed bar 6 projecting from the barrel 1 fills the arch of the nib, snugly resting on the feed bar, up to the chord of said arch, with the exception of slight lateral recesses 17 (see Fig. 6) at the point of said projecting portion.
  • the mouth of the air duct 9 at the Writing end of the fountain pen- may be considerably reduced in size, so that an escape of vapors from the chamber is almost entirely eliminated.
  • This amount of ink is sucked up into the ink ⁇ reservoir during the Writing or during the cooling olf of the air present in this ink reservoir.
  • 4the capillary potential at the vertex of the annular channel 2G is smaller than the capillary potential of the transverse chambers, the latter are safely drained during the writing or a cooling off of the air, in whatever position the fountain pen may be.
  • the ink-net of lthe chamber above the overflowy chamber is connected with the cylindrical space 8 of high capillarity by the transverse slit 24.
  • the Ilimit bounding the intensity of feed i-s determined by the'capillary'potential of thek ink conduit 8, 25 and the meni'scus-resistance at the vertex of the: eccentric annular channel Z0.
  • the limit bounding the intersity of feed is determined by the capillary potential of the ink conduit 8, ZS prevailing lat times and the rneniscus-resistance inthe transverse chambers 13.
  • transverse chambers may be of comparatively great width.
  • a comparatively great number of transverse chambers may be arranged, one above the other.
  • overow chambers may be designed for a capacity .of .024 cu. inch.
  • the size lof the transverse chambers is somewhat reduced towards the upper portion (as viewed in Fig. l) ot' the overow chamber.
  • the transverse chambers 1 may have a width of .028, and at a distance of 1.4 from the point of the nib the ltransverse chambers may have a width of .02".
  • the walls of the transverse chambers always remain in wet condition, so that at all times the readiness of ythe overflow chamber to receive ink is assured.
  • the feed bar 6 together with the pen nib 7 may be readily pulled out, for cleaning purposes for example.
  • the arrangement of the overflow chamber formed by the insertion of the hollow member 3 into the barrel 1 and connected with the atmosphere through the air duct 9 assures a uniform feed of the ink to the pen nib without disturbances by a warming up of the air in the ink reservoir 4 or by changes in the atmospheric pressure.
  • the arrangement of the end wall 2 hermetically sealing the overow chamber prevents the ink from evaporation and from an undesired discharge from said chamber, so that the fountain pen may be safely handled.
  • the cylindrical space 8 between the hollow member 3 and the feed bar 6 is extremely narrow, yetowing to its comparatively large diameter in relation to the total cross-section-said space 8 is of suicient width so as to permit a satisfactory feed of the ink to the pen nib.
  • a fountain pen comprising, in combination, a barrel having an ink reservoir in its rear portion and an aperture at its front end, a hollow member in the front portion of said barrel, the front end portion of said hollow member being in tight connection with the wall of said aperture, the rear end portion of said hollow member beingA in engagement with the inner surface of said barrel, a pen nib in said aperture at one side thereof, the portion of said hollow member intermediate said end portions having .arcuate cuts lin its outer surface-extending partly therearound leaving a longitudinal portion at the side opposite the nib, said cuts forming in conjunction with theinner sui'face of said'barrel an overow chamber,
  • said hollow member having a rear portion located beyond said overflow chamber adjacent to said rear end portion, the outer diameter f said rear portion and of said portion of said hollow member intermediate said end portions being slightly smaller than the inner diameter of said barrel so as to form a capillary space between the inner surface of said barrel and the outer surface of said hollow member including said rear portion beyond said overflow chamber, said space being impermeable to air in wet condition and forming an ink net, said longitudinal portion of the hollow member having ink iissures extending from the front end portion to the rear end of said hollow member and connecting said ink net with said ink reservoir, said hollow member having a longitudinal bore from end to end thereof, a feed bar within said longitudinal bore, said pen nib being arranged on the front portion of said feed bar, the portion of said feed bar in said longitudinal bore having a diameter slightly smaller than that of said longitudinal bore, thereby forming an ink conduit in the shape of an annular capillary space, said ink conduit connecting said ink reservoir with said pen nib, said rear portion of the hollow member located beyond said
  • a fountainpen as claimed in claim l said longitudinal portion of the hollow member being provided with a longitudinal air channel tapered from the front to the rear, said hollow member having at the nib side a wide longitudinal slot extending from said front end portion of the hollow member to the rear end of said overflow chamber, said longitudinal slot being connected with said air duct, said front end portion of the hollow member forming in conjunction with the inner surface of said barrel a first annular air channel having a capillary potential like the capillary potential of said overow chamber, the rear end portion of said hollow member having a second annular air channel tapered in transverse direction toward the nib side and having a capillary potential higher than the capillary potential of said overow chamber, said first annular air channel connecting said longitudinal slot with said longitudinal air channel, said longitudinal air channel communicating with said second annular air channel, the rear end portion of said hollow member having at the nib side a short longitudinal air channel connecting said second annular air channel with said ink reservoir,
  • a fountain pen comprising, in combination, a barrel having an ink reservoir in its rear portion and an aperture at its front end, a hollow member inserted into the front portion of said barrel, the front end portion of said hollow member being in tight connection with the Wall of said aperture, the rear end portion of said hollow member being in engagement with the inner surface of said barrel, said hollow member in conjunction with the inner surface of said barrel forming in the front portion of said barrel an overflow chamber, a longitudinal portion of said hollow member extending from the front end portion to the rear end portion of said hollow member, said hollow member having transverse arcuate cuts on the outside thereof and extending from one side to the other side of said longitudinal portion and forming said over ilow chamber, said cuts being separated by partitions between themselves, said hollow member having a rear portion located beyond said overow chamber adjacent to said rear end portion of said hollow member, the outer diameter of said hollow member between its front end portion and its rear end portion being slightly smaller than the inner diameter of said barrel so as to form capillary spaces between the inner surface of said barrel and the cylindrical surfaces of said partition

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pens And Brushes (AREA)
US233291A 1950-07-15 1951-06-25 Fountain pen Expired - Lifetime US2766728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE307024X 1950-07-15

Publications (1)

Publication Number Publication Date
US2766728A true US2766728A (en) 1956-10-16

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US (1) US2766728A (de)
CH (1) CH307024A (de)
DE (1) DE920051C (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871825A (en) * 1956-01-18 1959-02-03 Pairotto Man Nen Hitsu Kabushi Fountain pen
US2935044A (en) * 1955-10-24 1960-05-03 Parker Pen Co Fountain pen
US3154055A (en) * 1960-12-07 1964-10-27 Parker Pen Co Fountain pen
US3459486A (en) * 1966-08-05 1969-08-05 Staedtler J S Kg Writing utensil
US4556336A (en) * 1983-06-03 1985-12-03 Pilot Man-Nen Hitsu Kabushiki Kaisha Pen core for writing instrument
US4712937A (en) * 1984-04-28 1987-12-15 Schmidt Feintechnik Gmbh Plotter stylus with cap covered vent

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178325B (de) * 1957-09-21 1964-09-17 Ernst Rodenhaeuser Jun Tintenleiter fuer Fuellfederhalter mit zwei Ausgleichskammern

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US634398A (en) * 1899-08-04 1899-10-03 Eagle Pencil Co Fountain-pen.
US677008A (en) * 1900-10-26 1901-06-25 Walter W Winton Fountain-pen.
GB270915A (en) * 1925-07-13 1927-05-19 Theodor Kovacs Improvements in reservoir pens
US2223541A (en) * 1939-01-06 1940-12-03 Parker Pen Co Fountain pen
US2241865A (en) * 1939-12-28 1941-05-13 Sheaffer W A Pen Co Fountain pen
US2375770A (en) * 1943-11-19 1945-05-15 Arthur O Dahiberg Fountain pen
FR922825A (fr) * 1946-01-08 1947-06-19 J Maillocheau Ets Conduit perfectionné pour porte-plumes à réservoir
US2432112A (en) * 1945-04-12 1947-12-09 Moore Pen Company Fountain pen
US2512004A (en) * 1945-03-05 1950-06-20 Russell T Wing Fountain pen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US634398A (en) * 1899-08-04 1899-10-03 Eagle Pencil Co Fountain-pen.
US677008A (en) * 1900-10-26 1901-06-25 Walter W Winton Fountain-pen.
GB270915A (en) * 1925-07-13 1927-05-19 Theodor Kovacs Improvements in reservoir pens
US2223541A (en) * 1939-01-06 1940-12-03 Parker Pen Co Fountain pen
US2241865A (en) * 1939-12-28 1941-05-13 Sheaffer W A Pen Co Fountain pen
US2375770A (en) * 1943-11-19 1945-05-15 Arthur O Dahiberg Fountain pen
US2512004A (en) * 1945-03-05 1950-06-20 Russell T Wing Fountain pen
US2432112A (en) * 1945-04-12 1947-12-09 Moore Pen Company Fountain pen
FR922825A (fr) * 1946-01-08 1947-06-19 J Maillocheau Ets Conduit perfectionné pour porte-plumes à réservoir

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935044A (en) * 1955-10-24 1960-05-03 Parker Pen Co Fountain pen
US2871825A (en) * 1956-01-18 1959-02-03 Pairotto Man Nen Hitsu Kabushi Fountain pen
US3154055A (en) * 1960-12-07 1964-10-27 Parker Pen Co Fountain pen
US3459486A (en) * 1966-08-05 1969-08-05 Staedtler J S Kg Writing utensil
US4556336A (en) * 1983-06-03 1985-12-03 Pilot Man-Nen Hitsu Kabushiki Kaisha Pen core for writing instrument
US4712937A (en) * 1984-04-28 1987-12-15 Schmidt Feintechnik Gmbh Plotter stylus with cap covered vent

Also Published As

Publication number Publication date
CH307024A (de) 1955-05-15
DE920051C (de) 1954-11-22

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