US1776645A - Self-filling reservoir drawing pen - Google Patents

Description

Sept. 23, i930. E. F. WHITE SEL]ld` FILLING RESERVOIR DRAWING PEN Filed March 20, 1929 PatentedV Sept. v23, 1.930

UNITED vSTATES ELLIS FOULKES WHITE, OF COLWYN BAY;,ENt'rLAIN'D SELF-FILLING Resum/'0in DRAWING PEN,

Application med March 20,1929, sei-iai No. 348,605, @afmeren Britain August 17, 192s.

This invention refers to self-fillingl reservoir drawing or ruling ,pens of the kind havingmeans for varying the thickness of the line to be drawn, the .invention being primarily intended for use by draftsmen,

tracers, and the like, to save the time and effort now taken by the frequent re-lling of the ordinary ruling pen.

It is well known that the india ink used by m draftsmen,` etc., very quickly dries and congeals on the instruments, and it has hitherto been a great drawback in reservoir drawing pens that they do not permit a steady and continuous flow of ink.

The object of the invention is to provide an improved constructional form of pen of the type referred to, wherein the ink is caused to flow more readily and continuously from the container or reservoir into the nib, thus overcoming the before mentioned drawback.

v Other advantages will hereinafter appear.

According to the invention, the improved drawing pen comprises a hollow cylindrical body part, a hollow nipple secured to one end of the body part and carrying a compressiblc reservoir or container within the body part, means to lill and empty the reservoir, a cap i or cover, and an adjustable, interchangeable metal nib secured to the nipple. Said nib has a hollow parallel-sided shank part with bifurcated end, which end is conical on its exterior and forms what are hereinafter called the legs of the pen. Secured within the hollow shank and extending both downwardly between the legs and upwardly into the reservoir is a feed wire, while screwing on to the shank and embracing the legs is a `conical nut, with conical bore, by means of which the legs may be caused to approach fo each other to any desired degreeV within their normal limits.

Upon the accompanying drawing Fig. l is an exterior view vof the improved drawing pen,`the cap being shown in dotted lines in its closed position.

2 is a sectional elevation of one form of nib, and Figs. 3 and 4 are further sectional elevations, on planes at right angles to each other, of a modified form of the nib.

As shown, a is the hollow body of the pen closed at" one end, "and screwed exteriorly at the other end."l In the open end of the body a issecured a hollow nipple Z) which on its inner endcarries a compressible 4container or reservoir (not shown). c `is a pivotedle- `ver for the filling and emptying of thereserf voir in theknown manner, andd is a cap adapted to screw on to the screwed end of v the body a, or to't theother and tapered end, the parts a., Yc and al in all material respects, resembling a `sel`f-illing reservoir writing Fitting into the axial hole in theY nipple isone ef aseriesA of interchangeable nibs, the nibs 'beingofdifl'erentsizes lto suit the taste of the user,` or the nature of the work Y to bedone.' Each nib A'comprises a hollow parallel-sided shank e, bifurcated at one end u to forni two'legs-f, the ends ofwhich are foiz'inedto a'knife edge, and constitute the working edges of" the` pen. V'l`ilieslia1r1k e is. screwthreaded'` 'on "its exterior, to* receive the screwedY partofl a conical nut g, 'a `lock-nut h, and to screw into the nipple thelock-nut tbeing screwed against the end of the nipple' to prevent the turning ofthe nib `when i the nut g is turned; The inner faces of the legs f are normally parallel, i, e., when the t nut g is removed, but 1.their outerv faces taper towards each-'other from the shank to their working edges,rso that ongthe nut g being" screwed onto proff the shank the legs-may beset atmanyrequired distance apart and within the limits of their springiness, `and thus lines of differentthicknesses may he drawn. The ,upper end ofthe nut g is flanged',` and kn urled toallow of the adjustments being made by the finger and thumb of the hand in which the pen is carried.

vTo prevent ink reaching the nut g and then getting on to the backs of the legs f, the latter-are made to a width which is less than the smallest internal diameter of the nut, as clearly seen in Fig. 4. The nut bears only on the backs of the legs f. Y

The bore of the shank e is made to two diameters, and secured within the larger bore is a feed wire z', the wire being coiled at 1, and retained in position by friction. The upper end of the wire extends within the container, and the lower end eXtends to a point between the legs f about l from their ends. The lower end of the wire may be free as shownV in Fig. 2, but is preferably secured Vto one of the legs as shown in Figs. 3 and 4. Further, the wire maybe of wavy form as in Fig. 2 or'mayv bestraight. Tlieprovision of the wire promotes andensuresfa.ready'low' of ink into'the nib of the pen, and being attached to the nib, it remains in position when the nib is removed for cleaning. rori'other purposes.

The lock nut 7L may hav'e'aknurled edge I or may be slotted so as to bemanipulated by.

a key, andi will preferablybeof'smaller di# ameter than the vadjusting nut so as not normally toengage tliengers when: .theadjust-4 ing nut' g is beingnmoved.

l.. Ina selfflling reservoir drawinglspen. an adjustable interchangeable metal vnib. comprising a parallel-sided shank,'screw threaded orthe whole ofvitslength and-.having acentral internal bore, a bifurcatedy extension on oneend o f the shank shaped toform the legs ofthe pen, saidlegs tapering ontheir outer faces from. the shank to their ends, a conical nut with conicalV borejscrewing` on to the shank andembracingithe.legs at its lower endionly, a lock-nuten theshankwand a feed wire securedwithin the bore/.of the shank and extending; upwardlyv into thereservoir and'downwardlybetween the legsto a point near theirworking edges, thelegs of thepen being made .to a width .less thanthesmallest. Y

internal diameter of. theconicalnut, so that the nut bearslonly on the back ofleach leg, and the diameter offthe nut at its` lower' end being only slightly. greater than that of the contiguous part ofthe nib, as set forth.

2. In a self-filling reservoir drawingpen according, to` claim:1,.arshank vhaving. a central `internal bore oftwo` diametersv and Aa feed wire securedv friction within the .larger boreof'the shank, its upperendextending into thereservoir, and itslower'end passing through vthe smaller boreand'being secured tooneof the legs offthepen, asset forth.

In testimony whereof havesigned, my*

name to this specification.

ELLIS 11o "KES WHITE.

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