US1997424A - Pencil - Google Patents

Description

J. P. LYNN April 9, 1935.

PENCIL Filed Sept. 29, 1955 cerned particularlywith meansfor "frictionally' Patented pr. 9, 11935 .'Iohnl?. Sycamore, assig'nortojDur-O- .j LtePelicl Company, Sycamore, Ill., a corporaf` Applicatnsteihieigea iosasei-iaiuo. 691,422

" i'vciitiagwol. 12in-1n] fj .This invention #relates ,generally v.to mechanical pencils havingya lead propelling means adapti ed to be actuated byrotation of ai tip relative to the body. The presentgimprovements: arefconholding the tip in coop'erative relationwith the body; and with meansxfor `steadyingfthe utip relative to the body. 1 `1 f 1- These and `other objects, `as will hereinafter appear, are attained in a pencil having a iconstruction of which ,certain suggestive :embodiments are setforth inthe accompanyingL drawing, whereiny l Figure l is an enlarged longitudinal sectional View through, the pencil;

Fig.` 2 is an enlarged fragmentarysectional View of the tip endof theupencil;

Fig. 3 is an enlarged. transverse sectional View, taken online 3-.3 of Fig. 1; Fig. 4 isa View in perspective of the coupling sleeve per se; H 'l .1 I Fig. 5 shows partly in section and partlyin elevation a modified pencil construction; andl Fig. 6 is an enlarged transverse sectional view, taken on line 6 6 of Fig. 5. Y i

Referring to Figs. 1 to #l` inclusiveJ' haveshown therein `a pencil `having a body `A madev desirably 0f a suitable composition material, and provided with an axial chamber 2 0 whichjmay vextend'for l the entire length of the body.` Afradial groove 2| in which may track the; feed pin of thelead propelling mechanism is formed in the'chamber throughout its length. `At its head, the exterior surface' ofthe body Vis slightly'rece'ssed to receive in flush relation a cap 22 whichfforms a closure forthe'chamber atthat end.

grip portion 29 -of bakelite or other appropriate material. This grip which starts from the shoul` der 26 extends upwardly in cone fashion as "a continuation of the lower cone walls of the tip.

In its upper region, the grip portionproceeds cylindrically as at 30, its diameter, inside and out, being Vsuch as to coincide with the corresponding surfaces of the body when fitted in abutting relation thereto. The connection between the tip tube 25 and grip portion 29 may :beof any approved kind,;stee

ppitched threads 3|4 being suggested for the purpose. Fitted within the tube 25` of the vtip is one end. of a spiral Vtube C. This tube may be brazed or otherwise Ysecurely anchored Within,` the tip s o as to extend upwardly therefrom through the axial chamber of the pencil bodyfor the full length thereof'. `The spiral tube may conveniently be.

formed Vfrom -a ilat, ribbon of metal which is `rolled about a suitablemandrel, the convolutions of the tube being separated to leavev an open spiral' slot 35 which continues without interruption for the -full lengthof the tube. y A

To connectthe' tip removably and ialso rotat,` ably to the body, whereby itfrnay` serve Aaslgan operating medium for the Vlead propelling mechanism, .I utilize a coupling sleeve D Y(see Fig. 4). which, in the form shown, consistsV of asmall metal plate bent into cylindrical form with its proximate edges suiliciently separated toprovide an open sloti31. A slit `3B may also be providedl i through the walls of the sleeve for perhaps onef half its length on the side thereof which is preferably opposite the slot 31. The `sleeve end `re'-` mote `from theslit 38 is desirably` provided on its Vex-teriorwith steep pitched threads 39 which have l `'sleeve within the body, the axial chamber'theref` within is `desrably enlarged 'somewhat at the the chamber which extends longitudinally 'of the body. VWhen the sleeve is anchored in place, it is positioned rotatively so that the slot 3l aligns with the groove 2| inthe chamber.

The threaded end of the coupling sleevemay be permanently` and immovably embedded within the enlarged chamber` at the' lower end of the pencilbody. The remaining portion of the sleeve, however, viz., the end `wherein the. slit 38' is formed, remainsprotruded beyond theend ofthe pencilbody. Byreason of the slot 31 and slit 38, the walls of the sleeveare divided into spring sections which tend normally to` expand. When 'lower end` of the pencil, whereby the inner sur.- faceof the sleeve is disposed in` coincidence with;

theltip, together'with its helical tube, is applied `to the pencil body, the tubeis extended through the couplingsleeve, free of contact therewith; theinner surface of thegrip portion of the tip,

however, is engagedby the outer surface of the coupling sleeve spring sections which are free tion of the tip to the body requires that these `for `radial expansion. .Accordinglyg the applica-

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