US2177466A - Pencil eraser - Google Patents

Description

Oct. 24, 1939. H. K. STEMPEL 7, 6

PENCIL ERASER Filed Nov. 12, 1938 Patented Oct. 24, 1939 UNITED STATES PATENT OFFICE PENCIL ERASER Herman K. Stempel, Fort Madison, Iowa, assignor to W. A. Sheafier- Pen Company, Fort Madison, Iowa, a corporation of Delaware Application November 12, 1938, Serial No. 239,987

'- V 4 Claims. (01. 120-38) This invention relates to a pencil eraser and has special reference to an eraser adapted to. be reversibly housed in a holder of a mechanical pencil or the like and which may be extended from the holder as the eraser is worn through use.

More particularly, this invention relates to a device of the class described comprising the come bination' with a holder having an extensionandl a bore," of an open-ended shell having an end-- 10 for detachably engaging the extension and, a"

backing member for movably engaging the bore of theholder for extension therefrom to desired lengths, there, being an eraser reversibly housed by the shell and having one end, thereof en.-

extending beyond the shell as predetermined by the position of the backing member in the bore. Mechanical pencils of the usual type on the market today are provided with an eraser which 20 projects from the end of the holder andis either openly exposed or covered by a removable cap, the

eraser being replaceable when worn; The amount of eraser available for use on the end of a mechanical pencil is comparatively small and is limited in length by the character of the mateout becoming too flexible I for use. In other words, the length of the eraser must not be so long that when in use it will become too flexible. 30 I The present invention contemplates the use of a substantially elongated eraser housed in a shell for the support of a major portion of. the

length thereof, the extending portion being p'-re,

natural oil from the hand is likely to come into contact with the exposed eraser which would produce-a soiled spot on the paper whenfthe 30 eraser is used.

In-"order to protect the eraserand to prevent the eraser from detracting from theappearance of the pencil, a great number of themechanical pencils'now on the market are equipped with a removable cap which is adapted to house the gaging the backing member and the other ,enolv rial and the extent to which it may project withwear in use. In adjusting the pencil for use, the

eraserandconceal and protect it. Such'an ar-. rangement is inconvenient because ofthe fact that when the cap is removed in order to use the .eraser it is inconvenient to hold the cap or, if it is laid down, loss is liable to occur. Then, 5

f again, when the pencil is being used continuously ,in writing it is inconvenient to remove and replace the cap every time an erasure must be made. v I

The present invention contemplates the provision of an extensible eraser which is provided on one end with an attractive metal cap which may be extended from the shell when the pencil is being carried on the person, the eraser being,

reversible and having the other end project from Y the shell when thepencil is used for writing.

Thus, in removing the pencil from the pocket of the person for adjustment to use and in carrying the pencil, the eraser is not subject to contact with the oils from the hand and after ad- 2 justment to'use' the eraser is available continuously for use without removal of a cap. The appearance of the pencil is always attractive in the carrying of the instrument, and .when in use the eraser iscontinuously available.

One of the objects of this invention is to providea pencil] eraser of the character indicated above which is simple and convenient in operation, iscomparatively inexpensive to manuiacture, and isattractive.

Another object of this invention is to providev a pencil eraser of the hereinabove mentioned type I in which the eraser is extensible from the holder as the eraser becomes worn requiring a minimum amount of replacement.

' It isalso an object of this .invention to provide a pencil eraser of the type hereinabove noted in which the eraser is reversibly housed in a shell for appearance and for the prevention of soiling. 40 Other objects and advantages of this invention will hereinafter be more particularly pointed out and for a more complete understanding of the characteristic features of this invention, reference may now be had to. the following de scription when taken together with the accompanyingdrawingin which latter:

I Figure 1 is a front elevational view of a mechanical pencil embodying a pencil eraser incorporating the features of this invention;

Fig. 2 is a fragmentary elevational view partially in section of the pencil eraser of Fig. 1 showing the eraser in position when the pencil is carried; 5. a Fig. '3 is a view similar to Fig. 2 showing the of a lead pencil of the mechanical type, the forward end of the pencil being pointed and having a bore through which the usual lead is projected. The rear end of the pencil is provided with a plug II having a reduced threaded extension I2 and an internally threaded bore I3. The holder I is preferably split substantially midway thereof, the forward portion Illa housing the lead-operating mechanism and the rear portion Illb being hollow to house extra leads, erasers or the like.

A backing member comprising an enlarged head I4 and an integrally formed reduced threaded shank I is utilized for the purpose of maintaining an extended position of an eraser I6 from an open ended shell IT. The threaded shank I5 of the backing member threadedly engages the internally threaded bore I3 of the plug II, the shank being extensible out of the bore for projecting the head I4 to desired distances within the shell IT.

The shell I! is provided with internal threads atone end thereof for engaging the threaded extension I2 and is adapted therefore to be removable from the reduced extension when desired. As shown more particularly in Fig. 12, the inside diameter of the shell I! is such as to snugly engage the periphery of the eraser I6 and to prevent thereby accidental displacement of the eraser therefrom. The material of the shell I I as well as that of the holder is preferably of a plastic composition material and forms with the rubber of the eraser a more or less frictional fit.

The eraser I6 comprises preferably an elongated piece of rubber of the same cross sectional area as that of the bore of the shell, that is to say, the eraser may be round, polygonal, oval or of any desired shape to conform to the bore of the shell. One end of the eraser is preferably provided with a metal cap I8 which preferably fully encloses the end of the eraser and may be provided with surface ornamentation for enhancing the appearance of the pencil. The open end of the metal cap is pinched to extend into the eraser so as to be held against displacement therefrom or it may be held in any usual manner. 7

Referring now more particularly to Fig. 2 of the drawing, the eraser is shown in position in the shell on the holder for carrying in the pocket of the wearer, the metal cap extending outwardly beyond the end of the shell IT. The rubber of the eraser is protected against soil and is concealed from sight so as to prevent the usual unsightliness of a, misshapen eraser extending from the end of the holder.

Referring now more particularly to Fig. 3 of the drawing, the eraser is reversed in position from that shown in Fig. 2 with the rubber portion of the eraser extending beyond the end of the shell I! and is in condition for use in erasing. The eraser may be held in this position during the entire use of the pencil in writing with the eraser being continuously available for erasing and when writing has been completed the eraser may be reversed into the position shown in Fig. 2 for carrying in the pocket.

It is obvious that due to the .flexibility of the rubber, the full length of the eraser could not be extended out of the shell without the eraser buckling in use. Therefore, but a small portion of the eraser normally extends out of the end of the shell and as this becomes used up from wear in erasing it is necessary to project the eraser forwardly out of the end of the shell. The shell is unscrewed from the reduced threaded extension and the head I4 of the backing member is rotated in one direction so that the threads of the shank I5 engaging the threads of the bore of the extension II will project the head I4 forwardly out of the pencil. The shell I! is then screwed onto the threads of the reduced extension I I with the eraser being moved outwardly of the shell to an extent predetermined by the position of the backing member with respect to the reduced extension. When used in erasing the eraser is prevented from movement inwardly of the shell by the head I4 of the backing member and the eraser is reversible when worn, in the same manner as before an initial use. 7

While but a single embodiment of this invention is herein shown and described, it is to be understood that various modifications thereof may be apparent to those skilled in the art without departing from the spirit and scope of this invention and, therefore, the same is only to be limited by the scope of the appended claims.

I claim: 7

1. A device of the class described comprising the combination with a holder having an extension and a borev in the extension, of an open ended shell having an end for detachably engaging said extension, and a backing member for movably engaging the bore'of said extension for extension out of the bore to desired lengths, said shell being adapted to reversibly house an eraser having one end thereof enclosed by a cap, one end of the eraser engaging said backing member and the other end thereof extending beyond the other end of the shell as predetermined by the position of said backing member in said bore.

2. A device of the class described comprising 7 the combination with a holder having an extening one end thereof enclosed by a metal cap,

one end of the eraser engaging said backing member and the other end thereof extending beyond the other end of the shell as predetermined 2y the positionof said backing member in said ore.

3. A device of the class described comprising the combination with a holder having a threaded extension and a threaded bore in the extension, of an open ended shell having a threaded end for engaging said threaded extension, and a backing screw for threadedly engaging the threaded bore of said extension for extension out of the bore to desired lengths, said shell being adapted to house an eraser with one end thereof engaging said backing member. and the other end thereof extending beyond the other end of the shell as predetermined by the position of said backing screw in said bore.

4. A device of the class described comprising the combination with a holder having a threaded extensionand a threaded bore in the extension, of an open ended shell having a threaded end for detachably engaging said threaded extension, and

a backing member comprising an enlarged head disposed in said shell and a threaded shank for threadedly engaging the threaded bore of said extension for extension therefrom to project said head to desired distances within said shell, said shell being adapted to house an eraser with one HERMAN K. STEMPEL.

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