US1437180A - Mechanical pencil - Google Patents

Description

E E. HILL- MECHANICAL PENCIL. APPLICATION HLE D 050.16. I920.

Pat ented Nov. 28, 1922.

Pa a -.1 Nov. 28, 1922'.

U-ITED STA ES- ERNEST E. HILL, OF CHICAGO, ILLINOIS, ASSIGN OB TO THE WAHL COMPANY; OF

WILMINGTON, DEL AWARE, A

CORPORATION OF DELAWARE.

M ecnAmcAr. PENCIL:

v 'n pplication filed December 1e, 1920.",'seria1n .4e1,174. i

To all whomit may concern; .-i v Be it knownthat I- Ennns'r a citizen of the'lUnited tates, and a residentof the cit of Chicago; county of' Cook and Stateof llino'is,, have invented certain new an'd 'useful Improvements in Mechanical- Pencils, of which. the following-is a specifi-f I barrel. Near the lower end of the tongue 19- cation, h v

My invention'relates to mechanical en-- cils,- or =m'ore particularly-to :a pencil in which 'an independent lead isforced into the split tip thereof and forced from the pencilby a special mechanical plunger mechanism. .1

- The object of my invention is in'the pro vision; "ofa simple 'but efficient mechanism fforfpr opelling therefrom 'an'lindependent.

leadthrust into the split .tip of the pencil.

. Another object of my invention is in the provision. of a special lunger mechanism in connection therewith or, mechanically forc ing a lead from-thepencil. v

Other ob"eo ts of v 'y invention will appear in the,following specification and claim in the: annexed drawings in I Figi l'iisa the pencil? f, Fig. 2' is alper'spective view showing-indetail the mechanical propelling; mecha y nism Y Fig. 3 isf'a, cross sectional 'viewo'n' the line- 3-3'of Fig.1-;

' Fig. 4 is across 4& of Fig.1;

din a1 Sectional viewi'pf;

sectionalview on the line Figslii; 9 and 1-Oare plan'views of barrel nuts having apertures therein to conform to the plungers in Figs; 556 and 7 respectively. Referring to the drawings, 10 is .the outer casing or pencil barrel, said barrel .being. su edas' t 'll and having. formed at itstip.

the "splitlpcrtion 12: An innerbarrel 13 is spun 'ntejthe; upper end of the. pencil-barrel 'havinggggfrictional= eng gement therewith.

' Anindentation 13 prevents the'inner barg 7 rel fromslidingtoo far into the pencil barrel and; "the. ;portion projecting above the.

pencilbarrel forms a a: seat for the frictional cap 17 The member 13 hasa borel i an'd I groove 14 formed therein. As is beStqilluS- trated; in Fig. 3, "the chamber formed between-the inner barrel 13 and the housing .-Figs.5, 6 and 7 are perspective view's'inmember 18, hereinafter to be described, is

' A- plunger housing 18, having formed thereon the ho low tongue 19, fits into the corresponding bore and groove .in the inner is aprojection 20. which abuts the lower end of the inner barreland prevents the' plunger 'ghousing from being entirely contained within the member 13.

A}barrel n'ut21' abuts .the lower end. of the plunger member,. said barrel nut being soldered-to the inner wall oflthe pencil barrel. A'iplunger, guideway 22 extends down from thebarrel nut 21 and houses a portion of the plunger. Connected to the-lower end of said'guideflway'is' a lead tunnel 23, said tunnel containing therein independent lead thrust through the split tip of the pencil. A plunger member 24, having any of the threaded portions 25 as shown in Figs'l, 5,

.6 and 7, is contained within the plunger housing, and its outwardly projecting head 26 rides within the hollow tongue 19,

the lower portion of the-plunger passing =1thf0l1gh an aperture 27 conforming to its cross section, thence/through the guideway 1" 22 and abutting at its "lower end the independent, leadjcontainedin the lead tunnel.

- The-operation of the mechanical pencil is as pfol lows:

An independent. lead is thrust into the i leadt'unne'l through the split tip. a When it is desired that lead be forced from the pen-,

ciljthe cap'17 is turned in. a clockwise man- 'ner.- The cap; having frictional engageinent with the-inner. barrel113, also turns said barrel,;-. andthe inner, barrel :having contained therein the plunger housing, also turns said housing, thus theplungerfcon- ,tai-ned :within the housing is revolved and consequently; due'to its threaded portion,-is

screweddownwardly, thereby forcing the,

lead contained .in the lead tunnel outwardly through the splittip ofthe pencil.

Whil I have illustrated anddescribed the preferred form. of, constructionfor carrying myinventioninto" effect, this is capable of variation and modification; without departing fromthe spirit ofthe inventi'om- I, 7

therefore, do'not wish to be limited to the precise details of construction set forth, but

desire to avail myself ofsuch ariations and modifications as come Within the; scope of the appended claim.- v e Having described my invention,- what I claim ,a's new and desire to secure, by Letteis Patent is An article of the class described comprising a barrel tapered and slotted at one end to form a tip; a shell having a longitudinal guide way thereinrotatably mounted in the ,relative turningof the .Way therein; a nut mounted within the barrel below the shell; a lead guide connecting the nut with the tip and means whereby a shellin' respect to the barrel Will'causealead to-be propelled from the tip.

In witness whereof I 'have hereunto sub scribed my name. e 'ERNEST E. HILL.

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