US1435302A - Eraser holder for pencils - Google Patents

Description

C. C. ISAACSON.

ERAsEn HOLDER FOR PENcl'Ls.

` APPLICATION FILED FEB. 24, 1921. 4 1,435,302, mallteam. 14,1922...

-Patented l1922.5; I

mit?

ycani. c. Isaacson, OFCHICAGO, 'ILI I1\ToIs.v j

r es [sans an orsi vnnnsnn HOLDER Fon' PENcILs,

l Application filed February 24, 1921. Serial No. IJIILZEWG.v

'Be it'known that I, CARL IsAncsoN, a citizen of the United States,`res1d1ng at Chicago, in the county of Cook and lStateof' Illinois, have invented certain new and. useful Improvements in'Eraser Holders for Pencils,.of which the following is a specification.

My invention relates to eraser holders and comprises an improved mounting for rubber erasers adapted to form a pencil holder,

. to be applied to a pen holder' or a pencil,

or to form an integral part of a pen holder or a pencil. f

The main object of my invention 1s to construct an improved holder which may be used as an accessoryA for an ordinary pencil or pen holder with or without anv eraser fixed thereon, or which may be used as an integral part of one of the more complicated magazine pencils, no w on the market, which are generally of metal construction and in which lconservation of space is an important factor.

The use and flexibility of rubber -erasers require them to be firmly held within a short distance from their erasing end, a distance which is soon diminished as the eraser wears,

' whereupon the eraser is rendered useless unless lit can be 'replaced or ca n be extended to provide a new wearing portion, and anaddimeans' for securelfy `near its end 'and o .35

lcil of the ma azine'type referred v to above.- s The Ieraser older comprises an exteriorly threaded base 1 and an" lnteriorly threaded.v barrel 2. Base 1 is shownas a cap havingl pencil but may be threadedthereon or provided with'al common ring clamping means, if: desired. yBarrel. 2

tional object o'f my invention is to provide holding the pencil eraser a slip t on the screwed on to the'threaded end of base 1 and contains a cylindrical' eraser 3.. '.ih'el outerend of barrel .2 is crimped or breached to form .an inwardlyturned lipe, whiehbitesv extended r feeding the eraser from enamel.

into .theferaser to hold it against unwanted longitudinal movement.

The threads on the interior surfacefof bari rel 2 do not extend up to the outer, breached end of the barrel but leave asubstantial unthreaded portion 4a adjacent lip 4. The eraser contacts with thisl unthreaded portion and4 Vis held thereby against the alternate lateral movement which would otherwise result when the eraser is used, and which would produce an alternate' bending of the eraser, which would tend to Work Vit out of its holder and. also tend tol tear 0E thel projecting part. If the threads clear up to lip ,4, -almost all of the metal of portion 4a, .which nowv contacts with the eraser, would be re-.

moved and the eraser would only bear upon the points of thethreads. This bearing would be `1nsuiicient tov securely hold the eraser.

When the projectin portion of the eraser is worn down, either a l the way or only part way, it may be forced outwardly .by screw'- ingvbarrel 2 to the rlght on basel.

. h1le base 1r may be threaded far enough to permit barrel 2 to have a threaded en gagement therewith throughout -the length of the barrel, when screwed all. the ;.way

down, I prefer to thread' base 1 aishort distance only', as `clearly shown inv Fig. 2,'and

leave the remainder of the basey unthreaded and smooth, to

be finished with polishjor l l magazine 5 corresponds to base 1 and barrel 6 corresponds to barrel 2. The eraser 7 pro-V jects beyond the upper endof barrel 6'an1d `when worn. is, fed outwardl in 'the same is providedwith al'lip Scorresponding tolip` -j '-45 on barrel and withfasmooth-.eraser contacting portion 8*? correspondingto 'portioi'i I; f reel Whilelipstandsecurelyhold the eraser against such longitudinal. movement as re" sults from the-'use of the eraser, their grip wil-I not befsucientto resist the feeding of the eraser'by'l the relati'vey longitudinal movesponding bases.- Theif'pfgshownin forms an ornamental protector for theeraser and forms no'partof my'invention.

l am aware that eraserv holders have been threaded ontopencils andflthat various devices have heretofore used which per.

mit projection of an eraser from its holder,

upon a base which bears against the rear of the eraser and pushes it out ofthe holder as the screwing on operation is continued.

I regard the unthreaded portion of the in-I terior ofthe barrel adjacent Ithe holding lip as'an importantfeature of my invention, as I have found'that its presence renders my device much more useful and efficient than a similar device ,in which the threads are continued allthe way to the lip. With my holder, practically all of the eraser may be utilized, and the slight amount of eraser which remains unused, when the`barrel has been advanced upon its base as far as the threads permit, does not materially affect the value of thedevice. ,f

I am awarethat changes in the formj and construction of parts and details of con- -lar eraser-carrier internally screw threaded at the inner end thereof and havlng an inwardly projecting annular flange at the outer. end thereof and an intermediate plane or unthreaded portionbetween` said flange and threads and being of a diameter at least as small as theI diameter of the threads;

a compressing member having a screwv threaded inner end seated 1n the screwv threaded end of the eraser-carrier .and formed with an abutment to engage` the eraser; and an eraser having .'a cylindrical portion within the carrier of uniform diameter.

'cant c. rsAAosoN.4

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