US2548906A - Fountain pen - Google Patents

Description

April l 7, 19M

J. w. PARA FouNmN PEN Filed oct. 19, 1945 Patented pr. 17,.v 1951 FOUNTAIN PEN lohn William Para, Elizabeth, N. J., assignorto I David Kahn, Inc., North Bergen Township, Hudson County, N. J., a corporation of New Jersey Application October 19, 1945, Serial No. y623,266

This invention relates to a fountain pen and primarily to a pen having a readily replaceable point.

It is an object of the present invention to provide a fountain pen having a replaceable nib holding sleeve whereby substitution of a nib carrying a fine, coarse, or medium point, one for the other, may be readily made.

It is another object of the present invention to provide a leak-proof sealing means between the'v nib holding sleeve and the barrel of the pen.-

It is an additional object of the present invention to provide a fountain pen which will provide uniform feed of the ink from the barrel to the pen nib and will keep the pen nib moist for instantaneous use.

Another object of the present invention is to provide a cylindrical feed bar for fountain pens having a reduced semi-cylindrical portion at one end adapted to receive a pen nib, said feed bar having a pair of primary longitudinal feed grooves extending from one end towards the other, a. rib between said grooves, said rib being of lesser diameter than the feed bar itself, and capillary grooves formed as extensions of said primary feed grooves and extending towards the .outer end of the feed bar, the juncture of said grooves with the capillary grooves being anterior to the split between the nib when the pen nib is in position in the pen nib-receiving space.

Another object of the present invention is to provide a feed bar having a rear extension rod projecting beyond the rear end of the rear extension member of the insert plug and into the ink present in the ink reservoir, said extension rod preventing an accumulation of air bubbles in the ink reservoir. 1

Another object of the present invention isvto provide an insert plug having a forward exten- -sion member, the latter being adapted to be received in a counterbore of the sleeve-retaining .member, the length of the forward extension .the sleeve-retaining member to thereby facilitate the free flow of ink through the fountain pen.

Still other objects, advantages, and improve- .ments will be apparent from the following description, taken in connection with the accompanying drawings, in which:

Fig. 1 is a Side elevation view, partly in section, of a fountain pen having the improved point holding sleeve;

Fig. 2 is a sectional view on an enlarged scale section through the nib holding sleeve and vthe insert Pen;

which secures same in the barrel of the 14 claims. (ol. 12o-5o) Fig. 3 is a transverse vertical section taken-on the section line 3-3 of Fig. 2 showing in particular the dual ink feeding grooves;

Fig. 4 is a view similar lto-Fig. 3 taken on the section line 4-4 of Fig. 2 but on an enlarged scale;

Fig. 5 is a view on an enlarged scale through the nib and the feed bar, taken on the section line 5-5 of Fig. 2;

Fig. 6 is a view on an enlarged scale taken on the section line 6-6 of Fig. 2; and

Fig. 7 is a topplan view of the feed bar;

Fig. 8 is a side elevation thereof; and

Fig. 9 is av transverse vertical section taken on line 9-9 of Fig. 8.

Referring now to the drawings, andV more particularly to Fig. 1, the fountain pen of the present invention comprises -a cylindrical barrel I0 having a longitudinal bore II therethrough, said barrel having an ink reservoir therein. The upper end-of the barrel is closed by a capv l2 Vwhich may be screw threaded or otherwise suitably fitted thereon. -At the lower end of the barrel a counterbore I3 is formed for a purpose which will hereinafter beset forth.

A removablepoint holding sleeve I4 has its inner end of the same diameter as the barrel I0 and is tapered inwardly towards its outer end, terminating in a, flange I5. The sleeve I4 has a central bore I6V therethrough, a rst counterbore I1, extending from the outer-end, and a second Ycounterbore I8 formed concentrically with and as -a continuation of the counterbore I1 but of rethrough of approximately the same diameter as `the central bore I6 through the point holding sleeve I4. The outer diameter of the main body portion of the insert plug 24 is approximately' the same as the diameter of the counterbore I3 in the barrel I0, so that the plug will have a snug fit in the counterbore. The main body of the plug is provided with parallel annular grooves 26-26. The plug has a forward extension 21 provided with external threads 28 adapted to lmate'with the threads '23 in the wall of the counterbore 22 in the sleeve I4. A gasket re-A ceiving groove 29 is formed around the extension intermediate the main body portion and the threaded portion of the'plug, The length of 3 the threaded extension 2l is considerably less than thegdepth of thecounterbore 22in the sleeve I4 into which-'the extension nts inthe assembled relationship, there being formed therebetween the space S. Similarly, the plug 24 has a rear extension 30 which likewise has parallel annular grooves 3 I-3I formed therein. The diameter of the extension 30 is approximately-,the sameias that of the counterbore I3;in ..thev barrelttl into which the extension fits ini-"assembledEVV relation- Ship'.

The feed bar 33 which isgshoivn jin Figures?, '7, 8, and 9 is of generally cylindrical shape and is provided with a slanted end 34 asfshown in- Figs. 1, 2 and 8. As shown in Fig. 8, the slanted .xpOltiOn 3,rpllodvices.anointedv end which under- .,lies; the pen nih aiTheforward cylindrical section of the feed bar, from approximatelywtheymidsection toithe outer-.slanted'aend.`Y 34, is of greater diam'eter than Y'the rear --cylindrical section,

thereby making the two sections eccentric -to eachiother, as shown in'Figrll.V A shoulderi35 is thus; formed-.at the'juncture ofthe;` forward Vcylindrical section with the cylindrical rear-portion.

l'lwo parallelaprimary feed grooves 36-36 are formed inr the feed 'bar 33- extendingu longitudinally from the inner end toward the outer slanted end 34. These grooves'V are separated by ay partition 1or`ribS3'I,..-this rib'- being reduced in height,

nan overea'll connecting feed duct.

as by milling up to the point31a,so :as to form Anterior to the'diametrical plane through the inner edgeior gintermediatefthe inner and outer edges of the rslantedendt34of thefeed bar, the rib' 31 merges into the main body ofthe *feed bar, thereby terminating thefoverall feed duct, and the feed 4grooves36-3Imergerby rounded bottoms into 1 continuation vcapillary .grooves T38-38,'.respectively. Further,:whenI the feed barf33and nib40 are assembled with thesleeve I4,` the.point\31a,

is approximately in the same'diametrical plane as theendof the sleevef'l4.l Thekpoint :31a thus occurs. at the point 'at which the nib .-40 is'free to nieve awayfrornlthe feed under Lwriting pressure.

these groovesare .010 inch-wide;they'should be i.0l inch deep. `It is desirable that the seconda-ry capillary grooves have-a depth of about one-half .of that ofthe-primary feed grooves. Thecapillary grooves 38'-3B-.extend to-.approximately the edgelof-the slanted end 34 of the feed bar`33, as

wshownin- Fig. 7,#wheretheyare terminateddue to progressively decreasing depth. The-width-of thev capillarygrooves-3838 is the same as that ofthe main feed grooves-36`35 and the depth of the grooves `38--38 is approximatelyonehalf that of the feed grooves-36-"35,-that` it, 'if the latter grooves are .015 inch deep, the capillary grooves should be approximately .0075 inch deep.

The foregoing relationship of the primary feed and capillary grooves is correct if the depth of th'e capillary and primary feed grooves is measured from the outside of the grooves. It will be noted,however, that if the depth'of the feed grooves is measured from the divided bridge3'l,

they are identical both underneath the nib 4D and within the barrel proper. The difference, therefore, in the effective depth of the feed grooves is caused by the increase in height of the bridge 3l, shown in Fig. 5, as compared to 'the height of the bridge 31, as shown in Fig. 6,

this increase in height being consideredl in the relationship of the -'bridge 31 to the over-all' diV ameter of the feed barrel. The height of the ,bridge 31. is lower where; the bridge isifcontiguous -with the grooves 36-36. lThe bridge 3'Iis higher where it is contiguous with the grooves 38-38. ,515.The bridge 3l is therefore higher at the front end starting from the point 31a. Stated differently, the capillary grooves over the slanted end 341 ofthe feed' barare of the same depth as the primary feed grooves 36-38 in the main body lo 7section *of thevfeed bar 33, measured from the top of the ribor bridge 31. V

.As-shown in thedrawing, and particularly Fig. 5,V the bridge or rib'31 is higher with regard to the bottom of the capillary grooves 38-38 under l5 the nib than it is to the rear of the nib within fthe barrel; as -shown-infFig. ,Ing-otherfw'ords, 'until fa pressure is placedvupontherpointyor;nib 46, relatively srnall unconnected channels fori-ink are provided under the nib. These channels may, l2o ftherefore, -be` said tobe shallow or capillary,` 'in action. "Whenpressure is, howevenplacedupon thenibythenibitends to move awayl fromzglthe raised portion of;v the bridge 31 and.; allows free ilowof ink. gnaeifect, therefore, duri-ng writing :the capillaryv channels become increased Finv size and a continuous channelfis then established lfromthe ink supplyvin` the ibarrel to theLpoint. No comb grooves are'thereforefnecessary and :this feature not only resultsVA in increased:smoothness of feedand write-ability;but also ypreventsleakage when the pen is not in use.

The feed bar133 has a; reduced .cylindrical end member 39 extending beyond the :end 30a ofthe `rearextension ymernberil of the inner plug 24. Preferably,the member 3.9 should extend Ybeyond 'the end'a, `a-distancegequivalent to twicefiits diameter. The; projection of the-trod"V beyond ,the end-T39m acts as abreakerfor .the ink'andkeeps the inklowing steadily `tothe feed-bar 33 re- 40 'gardless of the presence ofi-.air bubbles.

,In assembly, the grooves 2li-+26l and: 3 I-.3 I'lare filled with adhesive or cement, and the insertplug 1.24 is forced into the'counterbore I3V of the barrel I8, thefrear extensionfentering the main .bore 5 II of the'barrel `Different :adhesives maybe used in the grooves :Z6-426 and 3 I-'3 I according y'toi the. differentfunctions-to be performed, ifdevsired. 'The feed bar`33 is next fitted inthe central bore 25 ofthe insert plug, the longitudinal .50 contactgof the feed barV insuring a snug fit of the feedbar inthis bore. "The pen point 43 is placed around the lower end ofthe feedA barwith Vthe splitbetween-the'nibs of the point-properly centered-with respect to the longitudinal rib'` 31 55. of the latter. The' sleeve is thenvplaced around Athe feed'bar33and thepoint 43 and'screwed rhome by the coaction of the threads 23 inthe vcounterbore 22 of the sleeve with the threads"28 on the forward extension 27 of the insert plug 0 2,4. 'The central bore 1 5 inthe sleeve I4 willpass over thefeedbarj33 due tothe ecoentricityrand longitudinal taper of the feed "bar 1 serves vto wedge' the pen pointY lirmlybetween the feed bar and the wall of the counterbore I'Sjinthe sleeve. As the sleevel4is screwedjinwardlygthe shoulder I9 intermediate the ycentra-l boreland -the fcounterbore "l'through Ythe sleeve `passes over andf engages 'with the shoulder'35 at .the juncture of the cylindrical forward section'with thecylindrical rear portion ofjthei feed' bar, thereby securing the feed bar againstV inward finovement The gasket 32willbe compressed be- 'tweenthe bottom wall of the oounterboreil in the sleeve VI4 and theshoulder formed'between the forward extension 2l and the main body por` tion of the insert plug 24 to form a liquid proof seal between the insert plug 24, and the counterbore 22 through the sleeve I4. Since the depth ;of the counterbore 22 in the sleeve I4 is greater vthan the length of the forward extension 21 on y theinsert plug 24, the extension cannot abut the bottom of the counterbore and prevent compression of the gasket 32.

In the operation of the pen, the rear cylindrical extension 39 on the insert plug 24 partially lls Aupthe lower part of the ink well in the barrel I0 and the counterbore 25 in the insert plug, thereby Aforcing the last remaining ink in the ink well toward the circumference of the latter `where it may more readily flow through the main feed grooves 36-36. Thel grooves 3ft-36 l are feed grooves in the sense that the flow of the ink A through these grooves is unrestricted. In the assembled relationship, the portion of the pen point 40 or nib directly above the split section overlies *the juncture of the main feed grooves 36-36 with the capillary grooves 38-38, as shown in f Fig. 2. The free flow of ink through the feed grooves 36--36 is therefore terminated at this point, the flow through the continuation channels 38-38 being by capillary action.

u If it is desired to replace one point 4i) with another, such as a coarse-point with a fine, or vice all times with ink.

6 rear body portion of the sleeve and the main body portion of the insert plug, a gasket in said groove, the length of the Vforward extension Amember of the insert plug being l less than the second counterbore of said retaining-sleeve to thereby facilitate the free flow of ink through the fountain pen, means for uniting the insert plugto the retaining-sleeve, a feed bar extending through said insert plug in said retaining-sleeve 'and aligning said members, said feed bar having a pair of primary longitudinal feed grooves extending from one end towards the other end, and capillary grooves forming extensions of Ythe primary grooves, and a pen nib overlying said grooves, said capillary grooves carrying the ink to the point of the pen nib and keeping the latter supplied at 3. In a fountain pen having a barrel, an ink reservoir therein, a bore through the barrel,a counterbore extending from one end of the barrel, an insert plug having a main body portion and rear and forward extension members thereon, said forward extension member having va gasket-receiving groove therein, means for securingthe versa, it is only necessary to unscrew the sleeve I4, remove the old point, place the new point around the forward cylindrical portion of the feed bar 33, and replace the sleeve I4. Since the l gasket 32 is not acted upon by the threads 23 in thersleeve I4, it will not become worn due to continued removal and replacement of the sleeve I4.

I claim:

l. In a fountain pen having a barrel, an ink reservoir therein, a bore through the barrel, a counterbore extending from one end of the barrel, an insert plug having a main body portion and rear and forward extension members thereon, said forward extension member having a gasliet-'receiving groove therein, means for securing the insert plug to the barrel, a pen nib retainingsleeve having a bore therethrough and a counterbore extending from the outer end of said sleeve,

a second counterbore extending from adjacent i the inner end of said sleeve, said forward extension plug member extending into the retainingsleeve counterbore, a gasket in the groove of the insert plug at the juncture of the rear body portion of the sleeve and the main body portion of the insert plug, means for uniting the insert plug to the pen nib retaining-sleeve, a feed bar extending through said insert plug in said retaining-sleeve and aligning said members, said feed bar having a pair of primary longitudinal feed grooves extending from one end towards the l, other end, capillary grooves forming extensions of the primary grooves, and a pen nib overlying .said grooves, said capillary grooves carrying the ink to the point of the pen nib and keeping the latter supplied at all times with ink. i, 2. In a fountain pen having a barrel, an ink @reservoir therein, a bore through the barrel, a

Ycounterbore extending form Yone end of the barrel, an insert plug having a main body portion and rear and forward extension members, means l for securing the insert plug to the barrel, a pen nib retaining-sleeve having rear and forward body portions and having a bore therethrough and acounterbore extending from the outer end of said sleeve, and a second counterbore extending from the end ofthe rear body portion, a vgasket-receiving groove at the juncture of the insert plug to the barrel, a pen nib retaining sleeve having va bore therethrough and a counterbore extending from the outer end of said sleeve, and a second counterbore extending from adjacent the inner end of said sleeve, said forward extension plug. member extending intol the retain-- ing-sleeve counterbore, a gasket in the groove of the insert plug at the juncture of the rear body portion of the sleeve and the mainf body portionv of the insert plug, means for uniting the insert; plug to the pen nib-retaining sleeve, a feed barv extending through said insert plug in said retaining-sleeve and aligning said members, said'. feed bar having a pair of primary longitudinal feed grooves extending from one end towards the other end, a pair of secondary capillary grooves: forming extensions of said primary grooves, a rib between said `primary and secondary pairs of grooves, said rib being of reduced height throughout that part of its length which Vis contiguous to the primary feed grooves, and a pen nib overlying said grooves and having a portion withinsaid sleeve, the juncture of the primary feed. grooves with the capillary feed grooves being approximately at the point where the nib enters the sleeve, said capillary grooves carrying the ink to the point of the pen nib and keeping the latter supplied atall times with ink.

4. Ina fountain pen having a barrel, an ink reservoir therein, a bore through the barrel, a. counterbore extending from one end of the barrel, an insert plug having a main body portion and rear and forward extension members, a pen nib retaining-sleeve having rear and forward body portions and having a bore therethrough, and a counterbore extending from the outer end. of Vsaid sleeve, and a second counterbore extending from the end of the rear body portion,r a gasket-receiving groove at the juncture of the v rear body portion of the sleeve and the main body portion of the insert plug, a gasket in said groove,

'lll said n iembers` saidfeed bar having a pair of pri- Ar-7 Vz-`n`1aryf longitudinalafeed groovesextending :from [Y one end towards :the .other;,end;.a pair ofA secondary: capillary grooves forming extensionsof Isaid .primary grooves; a rib between saidprimary and secondary Ypairs of,` grooves-said-f rib being-ofrei -duoed height throughout that .part :of: .its .length which iscontiguous to the uprimary-'feedgrooves, anda pen nibY overlying.; said groovesfsaid capillary` grooves carrying-the ink to theipoint of-the =pen nib and keeping the latter supplied-Latsall times:V with ink.

2.5." In i a fountainpenl having a f-barrel, an yink `reservoir therein, a' Abore through the-,barrelf a counterbore extending fromroneiendzof the barrel,- an insert plugfhaving--a main .body v.portion and'- rear andl forwardY extension members thereon, said forward extension.=member .havinga gasket-receiving-groove therein; a pen nib retaining-sleeve having a-bore therethrough. and acoun- "-terbore extending fromv the-outervendofwsaid sleeve, and a second-oounterbore extendingV from f adjacentthe inner end Vof.- saidv sleeve,f.said .forward extension plug member extending intofthe retaining-sleeve Voounterbore, .as-.gasket in .the .groove of the insert plugiatfthe juncture, of' the rear body portion of the sleeveandlthe main body Lportion of the insert plug, means foruniting Ythe insert .plug to thepennib retaining-sleeve, means *for securing the insert'plug .to the'barrel, a feed` bar: extending through .said insert plug in` ,saidY retaining-sleeve and aligning said members, said -feed=bar .havingd a pair?. ofi primary longitudinal feed grooves extending from one end towards the .other end, a pair of secondaryy capillaryv grooves f forming extensionsof said-primary grooves,a rib ibetween said primary. and @secondary pairs -of grooves; said rib being ofreduced height throughoutthat part of its-,length which'is .contiguous to .theprimary feed grooves,. said'ffeed barbeing provided with a rear extension rod projecting beyond I the reargendzof `the rear extensionimemberiof the insert plug and into.I the presentizin. the.. ink

.reservoir,v said extension rodapreventing accumulation of air bubbles -in theink reservoirpand` a v pen nib overlyingfsaid grooves and having aportion` within saidisleeve, the juncture jof. the pri- 1 v`mary feed. groovesandithe capillarysfeed grooves vbeing .approximately at :the .-point where the nib .enters the sleeve;l said capillary; grooves carrying the inkN to the zpoint .of the, .pen nib Vand ,keeping 'the latter supplied at allv timesfwith y ink.

6. In a fountain Apen having a barreL: an ink reservoir therein, a` bore through .the barrel, a counterbore extending from oneendzof the barrel, an insert plug-having a mainsbodyf.portiony and rear and forward extension membersameansffor securing. the insert plug to the barrel, a` pennib retaining-sleeve having rear-.andi forward .body

portions and having agbore therethroughand a.

feed.. bar extending through said .insert5 plnugain said retaining-sleeveand aligning said members, sa'id, feed bar having at pairhof primary longitudinal feed grooves rextendirlgfrorri ,oneenlrt 'wards' the other end, a pairof secondary capillary grooves forming extensions of lsaid primary grooves, arib` betweensaid primary` and second- A-ary pairs ofgrooves,l saidrib being -of reduced height throughout that part of itslength which 4is contiguous-to the primaryfeed groovesf said feed barbeing--provided with a rear extension'rod projecting beyond the `rear end of the extension pen nib-andY keeping thelatter supplied at all times Y with ink.

'7. Ina fountain pen, theacombinationof apen Vnib and a feed bar having extending longitudinally thereof a paii` of vprimaryffeedgrooves `andas continuations thereof a pair of capillary grooves,- a

vrib between said pairsvof grooves,'theidepthofthe the capillary` grooves measured from the top ofthe Yribbeing substantially` the same, said capillary grooves carrying --therink"to the point ofthe pen nib whereby-ink is supplied toA the point, at? all times, said-capillary grooves being loeatedat the extreme end of thefeed-barwliich is adaptedto underlie the pen nib.

`8. In a fountain pen, a combination of a pen "nib and a feed bar,l having extending"longi,

tudinally thereof a pair ofL-prirnaryff'eed grooves and continuous therewith va pair of Vcapillary grooves, said pen nib overlying said grcoveay the bottoms of the capillary gr'oovesfromthejuncture point between the primary and capillarygrooves being at a higher level with respectto the lower surface of-ther said feed b ar than the bottons ofthe primary grooves, a rib between lsaid pairs of primary` and secondary grooves, said rib from said juncture point to adjacent thefOrWard'end of the feed bar being higher with regardto'the f lower surface ofthe feedbar than the portion of vthe rib extending'from the juncture point to the rear end of the'V feed bar;A the depthfof said pairs g of v grooves measured from the top surface of -the Arib-being substantiallythe same. Y

Vprimary feed grooves and continuousrtherewit'h a pair of capillary grooves, said pennib overlying said grooves, the bottoms ofthe capillary grooves from the juncture point between the primary and -capillarygrooves being at a higher level withv respeot to'the lower surface of the said feed bar than the bottoms of-'therprimary grooves, a-rib -between said; pairs of primary and secondary grooves, said-rib from said juncture point to adjacent theV forward-end of the-feedbar being higher with regard to--the lower surface `of the feed bar thanv the portionof the rib extending v from the junzrture` point tothe rear end of the I feed'bar, the ,depthofsaidwpairs ofgrooves `measured from the` top surface of V therib b substantially Lthe same, ythe juncture of lith Vmary feed grooves with the capillary grooves Vapproximately at therpoint of ,encl os ureofthe ,niby when the pen nibis in operativeassembled positionwith thefeedbar. l0.- In a fountain penz.;h avr ing agl barre1,a bo re throughthe barrel, a counterbore extendingff'rom oneendof vthe-barrel, an. insert plughaving a nain portion and reduced rearand forward, xt ens ns thereon and a bore of substantially vunif"orufliefmeter therethrough, the rear extension being received, with a squeeze t in the bore through the barrel and the main body portion with a squeeze t in the counterbore, the forward extension being threaded and having a gasket receiving groove therein at the shoulder p-rovided by the main body portion and the reduced forward extension, a feed bar positioned in the bore of the insert plug, longitudinal grooves in the feed bar, a threaded sleeve encompassing the feed bar and adapted to hold a pen nib in place, and having an internally chamfered end to encompass a gasket in the groove in the insert plug between the main body of the insert plug and the sleeve.

11. In a fountain pen, the combination of a barrel having an ink reservoir therein, a plug insert member mounted in the ink reservoir end of the barrel, said member having a main body portion and rear and forward extension members, a

pen nib-retaining sleeve member, means to unite said members, a pen nib, and a feed bar having a main body portion, a pen nib-retaining portion and a rear rod-like extension member extending into the ink in the ink reservoir and beyond the rear end of the rear extension member of the insert plug, thereby preventing admission of air bubbles in, to the pen nib-retaining portion, the pen nib-retaining portion of the feed bar having longitudinally thereof a pair of primary feed grooves, and as continuations thereof a pair of capillary grooves, and a rib separating said pair of grooves, the depth of the primary feed grooves being greater than the capillary grooves as measured from the top of the feed bar and the depth of the grooves measured from the top of the rib being substantially the same, said capillary grooves carrying the ink to the point of the pen nib whereby ink is supplied to the point at all times, said capillary grooves being located at the extreme end of the feed bar which is adapted to underlie the pen nib.

12. In a fountain pen having a barrel, an ink reservoir therein, a bore through the barrel, a counterbore extending from one end of the barrel, an insert plug having a main body portion and rst and second reduced cross sectional portions thereof, and having an aperture of uniform cross section axially-therethrough, said rst reduced portion having a gasket receiving groove at the junction of said main body portion and said ff rst reduced portion, means for securing the insert plug to the barrel, a pen nib retaining sleeve having a bore therethrough and a counterbore extending from the outer end of said sleeve, a

second counterbore extending from adjacent the inner end of said sleeve, said plug first reduced portion exending into the retaining sleeve counterbore, a gasket in the groove of said first reduced portion, means for uniting the insert plug to the pen nib retaining sleeve, a feed bar having a main portion with a slant end and a diametrically reduced extension portion, the juntion of said main portion and said extension portion providing a shoulder of diameter equal substantially longitudinal feed grooves extending from said shoulder toward the slant end, and capillary grooves forming extensions of the primary grooves at said slant end, said feed bar rear extension projecting beyond the rear end of the second reduced portion of the insert plug and into the ink reservoir, said extension portion preventing the trapping of air in the ink reservoir adjacent the shoulder portion of the feed bar, and said capillary grooves providing ducts between the primary feed ,grooves and the point of the pen.

13. In a, fluid writing pen having a uid reservoir, a writing nib, and means for supplying fluid from said reservoir t0 said nib, said means comprising an insert plug, a sleeve and a feed bar, said insert plug having an aperture of uniform cross section extending axially therethrough, and having a generally cylindrical outer surface having a first and a second reduced portion, said first reduced portion being adapted for insertion into a barrel, and said second reduced portion being adapted to internally engage said sleeve, said feed bar having feed grooves therein and having a main portion, and a diametrically reduced extension portion, the junction of said main portion and saidv extension portion providing an annular shoulder the outer diameter of which is substantially equal to the diameter of said insert plug aperture, thereby providing a closure, except for said feed grooves, for said insert plug and said barrel, said reduced extension portion extending through and projecting outwardly from the said first reduced portion of said insert plug.

14. In a fountain pen, a feed bar comprising a main cylindrical portion, a first end tapered portion and a second end reduced cylindrical portion, a pair of parallel primary grooves separated by a rib in said main cylindrical portion, said feed grooves having a uniform depth substantially one and one-half times their width, and a pair of capillary grooves in said rst end tapered section having a depth equal substantially to one half the depth of said primary feed grooves, said capillary grooves being located at the extreme end of the feed bar which is adapted to underlie the pen nib.

. J OI-IN WILLIAM PARA.

REFERENCES CITED The following references are of record in the file of this patent:

to the diameter of the aperture in the insert plug and said extension portion forming an annular space with said insert plug, said feed bar extending through said insert plug, and having primary UNITED` STATES PATENTS Number Name Date 467,785 Walke Jan. 26, 1892 834,541 vWelty Oct. 30, 1906 1,107,641 Badini Aug. 18, 1914 1,574,930 Pollock Mar. 2, 1926 1,938,314 Bromer Dec. 5, 1933 2,292,381 Klagges Aug. 11, 1942 2,337,343 Para Dec. 21, 1943 2,375,770 Dahlberg May 15, 1945 2,380,763 Juelss July 31, 1945 FOREIGN PATENTS Number r Country Date 412,610 Great Britain 1934 473,175 Great Britain 1937

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