US2448103A

US2448103A - Eraser tipped pencil

Info

Publication number: US2448103A
Application number: US611578A
Authority: US
Inventors: John F Linden
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-08-20
Filing date: 1945-08-20
Publication date: 1948-08-31
Anticipated expiration: 1965-08-31

Description

Aug. 3l, 1948. J. F. LINDEN 2,448,103

ERASER TIPPED PENCIL Filed Aug. 20, 1945 /w/ENTo/e, JHNI' fm/05N Patented Aug. 31, 1948 UNITED fsTATr-:s .PATENT oFFxcE 2,448.19? f ERASERv TIPPD PENcn.

JohnrF. Linden, Toronto, ontario, canada Application August 20, 1945, serial No. G11-,57s

l The invention relates to improvements in eraser attachments for pencils of the ordinary i kind com rronlyf known as lead pencils, and

yfrom which the eraser projects.

The major object of the present invention is the provision of a one-piece eraser adapted to project from a ferrule and to completely surround the side wall thereof so as to furnish a large and adequate eraser which will last as long as the pencil itself, and which is simple in con-,- struction and. inexpensive to manufacture.

Another object of the inventionis the provision Iof an efficient and serviceable method of firmly applying the eraser to the ferrule, and one that can be carried out at low cost in the manufacture of the pencil.

Still another object is the provision of the novel arrangement of means for fasteningthe eraser element to the ferrule so that it will be effectively secured thereto.

Having recounted the major objects andadvantages of the invention, other objects yand advantages will become apparent from'the ensuing detailed description of the invention as illustrated In `the accompanyingdrawing which forms a part thereof.

In the drawing, Fig. 1 is an elevational View partly in section of an eraser tipped pencil embodying my invention.

Fig. 2 is a cross section on line 2--2 of Fig. 1.

Fig. 3 is a similar view to Fig. 1 but showing the pencil as of a circular cross section and the eraser of a hexagonal configuration. l

Fig. 4 is a cross section on line 4--4 of Fig. 3.

Fig. .5 is a further elevational view partly in section of a. modication.

Fig. 6 is a view depicting the ferrule supplied with a different form of fastening means for the eraser.

Fig. I is a view showing the eraser and pencil of Fig. 1 before the ferrule is pressed into the eraser.

The eraser attachment of the invention is adapted to be applied to a pencil of ordinary form. In the drawing there is shown a conventional type of pencil of which the wooden sheath is denoted 9 claims. (ci. 12o-3e) at III. In proceeding in accordance with the invention there is provided a cylindrical metal ferrule II securely mounted at its inner end to the outer end ,of the pencil sheath. Conventional means are preferably used to attach the ferrule to the pencil. The inside diameter of the f errule is substantiallyequal to the cross section of the pencil, The projecting outer end I2 of the ferrule forms asocket.

The eraser element is a block of erasivematerial, generally denoted aty I3, which is made longer and wider than saidsocket portion .of the ferrule. In the application of the eraser element to the 1outer end ofthe ferrule it is fitted over thefsame to provide a distal end I'4 of solid materal and an inner end comprised of a central f tenon I5A which fits into the socket I2, and an vouter part I6 which completely surrounds the ysocket portion of the ferrule and is'axially coextensive with said tenon. Consequently ythere is supplied .a thickness br band of eraser material kextending-entirely around the outerend of the ferrule whose longitudinal extent is equal tothe portion of the eraser-material projecting into the socket. Since the cross-sectional area of the eraser element is greater than that of the ferrule, there is provided an unbroken thickness of material around the ferrule which can be advantageously used and which prolongs the life of the eraser.

The block of eraser material is applied to the pencil by pushing the open end I2 of the ferrule into the material so that it will cut its way therein and embed itself. The annular edge of said-outer' `end serves as a cutting edge in urging the ferrule into the eraser material and the ycentral portion of the material which is annularly severed, enters the socket I2 and seats itself against the adjacent end of the pencil in the lform of the central ltenon I5. 'Iihe material of the tenon is under compressive stress vand the material around the `ferrule is under expansive stress, which frictionally binds the eraser on the :requirements during the life of the pencil and is convenient of use. The eraser is of uniform angine 3 girth and the surface thereof is uninterrupted from one end to the other.

T-he eraser may be made of a circular or any other `configuration in cross section. In Figs. 1 and 2 there is illustrated an eraser of the present disclosure having a circular girth. In Figs. 3 and 4 the eraser is of a hexagonal form. The novel method of attaching the eraser to the ferrule isv advantageous in that the Wall of the socket 'gis frictionally gripped 'internally and externally, by the rough surfaces of the cut made thereby, and it is obvious that these cooperating surfaces are specially adapted to adhere to any approved adhesive materialfas maybe applied in any preferred manner to aid in securing the socket portion of .the ferrle'to the eraser. The thus providedWdualContact' sul'- faces assure of a maximum of rigidity and resistance to longitudinal withdrawal of the leraser as well as guarding against its becoming fracturedforbroken in -f use.

vf'Io' further aid in the'securing ofthe eraser to pliediwi'th claws,l grooves orv analogousy means.

v "For instancefin Fig.- 5 there -is depicted a claw- `*likeelement l ly 'formed fini the'wall of 'the ysocket f'l2 lbyfmeans of la Iprick-punch*tool after the Veraser"isapplied. 'For' purpose the pricktool can be driven through the outer "thickness 16 of 'the' eraser'material. fThehole-made inthe eraser I'by'fthef-pricktooliwill Close f on removal ofthe ftoolfduf-:l` -tol fthe' elasticity" of the 'mat'eri-al. O-ne for "more in'dents Caniof vcourse be made' in" the l ferrule to produce a-r` desired number "of fthe claws.

The Afastening means lon' thersocket' 312 may also Linclude' a" groove as represented' atE I 8- J in Fig. 5. The' groove is? shown .as *af *peripheral 'indentation mayA extend partlyfor completely around the Fig.' 6 1 a different' fform 'ofVVA groove 4is' "shown "f'whichfisf of a spiral formi and'ofia co'arsepitch.

This groove,which is denoted'at I9,Ipreferably has its 'ends tapered as' shown. The' spiral groove `4`is fashionedbyldeformingE the'socketwall and' thus provides a "ridgei interiorlly' 'th'ereof; which due 1 to'- the steep' pitch -freadilyepenetrates the *eraser lblock in forcing #the ferrule Ytherein. `'When' the eraser ismountedionthe ferrule the ridge offers effective resistance "against axial displacement of the eraser.

1'It""willfbef manifest fthat 'my4v invention pro- "vides" a'f-highly eicient and serviceable Yeraser'for a pencil and-that su'ch` changes and modifications *of thesecuring means-on the :Eerr'ule maybe' re-` 'lsa'idllouter Zend` 'of the l'ierrule vand to Jprovide Ian Mehdorn-passingband-like thicknessfof erasive :'Fmateri'al ex-tending completely around said outer end and tightly ffiicti'onally tted "thereon, 'said block-being of greaterwidth-than' the' diameter of i 'i `said ferrule. i

25" An eraser lattaclmlent for; pencils comprisv'fingann eraserelementf-of: a substantially hex- "agorlal fformation having: a' 'greaterflength than 'sive withsaid inner partand integral therewith at the outer end of the'eraser element.

3. An eraser attachment `for pencils comprising an eraser element of a block formation havlv'ing an-inner end, and a hollow cylindrical ferrule ofy a substantially uniform diameter having yits outer end adapted to project from the pencil, said` outer end thereof being press tted into said inner end of the eraser element to out its way'therein and to provide an inner central portion of erasive material tightly iriotionally en- -fl'gaged-with-'Vthe interior surface of said outer end 'fandto providean outer uninterrupted portion 'of` erasive material extending completely around `'said outer end-and tightly frictionally engaged l With `the louter surface thereof.

l 4. An eraser attachment as set forth in claim l, in which the ferrule fis `provided with positive fffasteningimeans for `securing the'block thereon. 15.1' `An 'eraser attachmentas set forth in claim'l,

gofinfwhich the `ferrule is deformed to form ythereonprojecting elements for securing the block i' f thereon.

6. An eraser attachment as set forth in claim 1, vnii-which"the ferruleis prick punched subsequent a'tothemountingof the block of erasive material soj-y as 'toprov'ide claws' for'f positively retaining Ikfthe? block lthereon.

f 7. 4An erasiveattachment as dei-ined in claim 3, iri'which theouterend of lthe :ferrule isf supplied llo with? aLl-spiral. groove ofia coarse pitch for 'aiding in fret'aining the' eraser element thereon.

BHAnMeraserattachment for pencils compris-- -Ying-aiiblo'ck'of erasive'mat'erial, and a ferrule adapted'to Abe secured on one end of a pencil,

the outer end of the fer-rule yadapted to project *beyond* theend of the pencil being implanted in said'blockin a mannerto provide a central tenori xfof: Eerasive `material .tightlyZ frictionally tted in said outer end of the" ferrule and-toprovide an 'encompassing'band-like thickness of erasive ma- "of erasive material 'tightly frictionally fitted' in`65 "terialfext'ending completely around said outer Tend ancltightly frictionally tted thereon, said block`terminating.at its outer eend with a section ."of"solidand-uncutmaterial integrally projecting beyond the outer end of the Feirule, and said "'blockbeing of greater width'than thefdiameter foi-the ferrule.. f

9. An eraser attachmentffor'fpencils comprising v.lander-aser'element of a block formation having a *section constituting an iouter `end `of solid and ldiner-t"material'integrally with a section constituting an inner-vend'carried byA an axially holf'low'cylindrical' ferrule having its outer end adapt- .v-'ed'to'project from the'pencil,v said outer end of the ferrule being pressilittedin said Vinner end erft-heeraserfelement. to provide an inner` cen- --tral yportion of eraser material-'tightly frictionally engaged with the inner face of said outer vend 'Ilot the ferrule and f to provide van outer uninterrupted portion :ofl eraseiw-materialf completely surrounding said outer end of the ferrule and vtightly lfrictionally engagedf with the outer ,face ft'hereof. i

f vJOHN F. LINDEN.`