US1927142A - Eraser and holding tip therefor - Google Patents

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p 1933- H. B. VAN DORN ET A1, 4 1,

ERASER AND HOLDING TIP 'IjHEREFOR Filed Jun 18. 1952 FREDERICK A. /7/x ATTORNEYS I Patented Sept. 19, 1933 Q UNITEDSTATES PATENT OFFICE ERASER AND HOLDING TIP THEREFOR Horace B. Van Dorn, Maplewood, N. J., and Frederick H. Mix, Brooklyn, N. Y., assignors to Joseph Dixon Crucible Company, Jersey City, N. J., a corporation of New Jersey Application June 18, 1932. Serial No. 617,924 2 Claims. (01. 120- 38) This invention relates to erasers intended for of the eraser taken at rig t angles a Of attachment to pencils or pencil caps, and to a Fig. 3; Fig. 5 is a sectional view on the line 5-5 holding means for securing the erasers to the of Fig. 1, looking in the direction of the arrows; pencil or cap. Fig. 6 is a front view of a pencil cap, showing the 5 The object of the invention is to provide a novel eraser held therein, and Fig. 7 is a view taken at 60 form of eraser intended for attachment to pencils right angles to t at Of 6- or to pencil caps in which the desirable features In t e Co struct on S ow i F t0 5 of the so-called circular or disc eraser are elusive, 8 indicates a pencil of conventional form present. It is well known that an eraser of thin pr v d d at one of its ends with a tubular metal r fiat o t ur, provided ith urv d, sharp or ferrule or socket 9 for the reception of the eraser knife edge about its periphery, is more suitable 10. The tubular ferrule or socket 9 is secured to for some erasing purposes than the usual cylint p l y any f h m h d generally drical eraser mounted on the end of a pencil. p as for instance, y Perforating the metal The flat type of eraser, presenting a sharp or thin of the ferrule and forcing the displaced metal incurved edge, enables erasures to be made within Wardly t penetrate t Wooden Sh at of the 70 a very small area, without marring or disturbing P adjacent or surrounding writing. The eraser 10 is of rubber and is formed with In the past, efforts have been made to attach a central cylindrical reinforcing portion 11 which erasers of the flat type to pencils or pencil caps, fits within the corrugated part 12 of the ferrule but without material success. The failure of 9 and is held thereby. Additional fastening such prior devices was due primarily to the shapes means for holding the eraser in the ferrule 9 may of the erasers employed and to the manner in be employed, as by perforating the ferrule 9 and which it was attempted to secure the erasers in forcing the displaced metal inwardly to penetrate position. In most cases the thickness of the the eraser, as indicated at 13. The cylindrical eraser used was such that the eraser did not portion 11 of the eraser has its upper end formed possess the required stiffness to enable it to with a conical portion 14. Extending laterally satisfactorily perform its intended erasing funcfrom the cylindrical part of the eraser is a disktion. In other cases, the means provided on the shaped or flat portion indicated at 15, this pencil for holding the eraser did not grip or part of the eraser being in the same plane as the hold the eraser with sufficient force to resist the axis of the pencil to which it is attached. The strain imposed upon it during the erasing action opposing faces16 and 17 of the portion 15 conso that the eraser became easily dislodged from verge from the cylindrical reinforcing portion 11 its position on the pencil or pencil cover. of the eraser to the peripheral edgeslg of the disc, This invention contemplates a structure in this edge being relatively thin and sharp to enwhich these and other defects of prior er'asers able erasing to be performed by it within a small are'remedie'd and in which the form of eraser area. employed and the means for attaching it in place The cylindrical reinforcing portion 11 of the result in a very satisfactory.structure wherein all eraser extends below the disc-like portion 15 and of the advantages of the flat or circular eraser enters into. the ferrule 9 wherein it is held as 9 may be utilized. previously described. The opposite sides ofthe Specifically, the invention comprises an eraser ferrule 9 are formed-with V-s'naped slots 19 withbody of flat characteristics and preferably of disc in which the lower edge portion of the disc 15 shape, provided with a curved, thin, sharp or fits and by which rotative movement of the eraser r knife edge and formed witha' central conical in the ferrule 9 is prevented. I or cylindrical reinforcement which is either re- While the portion 15 of the eraser is herein movably received or securely fastened in the usual shown as being relatively disc-shaped, it will be tubular metal pencil ferrule or in a tubular pencil understood that the same need not necessarily be cap. formed in this particular shape since many other In the accompanying drawing, wherein sevforms may be used with satisfactory results, the eral embodiments of the invention are shown, Fig. primary requirement of the shape employed be- 1 is a front elevation of a pencil provided with an ing that it be substantially flat and thin to proeraser made in accordance with this invention; vide a-sharp and preferably curved erasing edge. Fig. 2 is a view at right angles to that of Fig. 1; These requirements are more satisfactorily met Fig. 3 is a face view of the eraser as it appears by an eraser of disc shape although other forms when detached from the pencil; Fig. 4 is a view may be employed with success.

The central cylindrical reinforcement 11 conforming to and tightly fitting the ferrule 9 securely holds the eraser in the ferrule and since its upper conical terminal 14 extends nearly to the peripheral edge 18, it is of sufficient size to add. body and strength to the eraser and acts as a reinforcement where the bending strain is imposed by the act of erasing.- This serves to prevent breakage of the eraser, which was one of the primary defects of prior structures.

In Figs. 6 and 7, the eraser is shown attached to a pencil cover or cap 20. This cap or cover is of conventional construction and is provided at one of its ends with the usual corrugated portion 21 into which the cylindrical part 21 of the eraser is received. In this construction the eraser may either be permanently fastened in the cap or may be removably held therein so that a new eraser may be substituted when that in position becomes worn from use. The cap or cover member 20 is provided with the V-shaped slots 22 fitting the disc portion of the eraser as previously described with reference to the construction of Figs. 1 to 5.

What we claim is:-

l. An eraser attachment for pencils comprising, a fiat rubber disc provided with an integral central conical reinforcement formed with a lower cylindrical part, said reinforcement having its upper end extending relatively close to the periphery of the disc, a pencil ferrule or cap into which the cylindrical part of the reinforcement is fitted, said ferrule having its wall slotted at diametrically opposite points to form the ferrule into jaws which embrace the opposite faces of the disc and prevent rotative movement of the eraser in the ferrule.

2. An eraser attachment for pencils comprising a disc-shaped section of rubber provided with a central cylindrical reinforcement, the edges of said disc-shaped section being substantially V- shaped in cross section, a pencil ferrule into which the reinforcement is fitted, the wall of said ferrule being provided with V-shaped slots which divide the ferrule into jaws embracing portions of the disc adjacent the central reinforcement and preventing rotative movement of the eraser in the ferrule.

HORACE B. VAN DORN. FREDERICK H. MIX.

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