US840485A - Eraser. - Google Patents

Description

PATENTED JAN; 8, 1907. RFABBR.

BRASER. APPLICATION FILED SEPTQ29, 1906 WITNESSE To all whom it may cancer-1t:

dle of bristles, b

' EBERHARD FABER, of NEW YORK, Ni Y.

ERAS-ER.

, Specification of Letters-Patent.

Patented Jan. 8, 1907.

Application tiled September 29, 1906. Serial No- 336.778.

Be it known that I, EnERnARp FABER, a citizen of the United States, residin in the city of New'York, in the county'and tate of New York, have invented a certain new and useful Improvement in Erasers, of which the following is a specification.

This invention concerns erasers, and has reference more particularly to erasers for re-. moving type-written matter,

and which consist of adisk of rubber mounted for rotation between two sheet-metal plates. Preferably, though not necessarily, the plates may be extended beyond the periphery of the rubber disk, and have secured between them a bun which the particles removed from the s eet can be brushed away.

The object of the invention'is to efiect certain improve rents in the construction of erasers of this ty e, the improvements being directed at lengt ening the period of usefulness of the eraser without increasing its cost. These features, which I believe to be characteristic of my invention, will be more fully set forth in the following descri tion, which is to be taken in connection wit the accompanying drawings. In the drawings, Figure 1 is an elevation of the eraser. Fig.-2 is a central section thereof on line 2 2 of Fig. 1, and Fig. 3 is a section online 3 3 of Fig. 2. 7

Referri to the drawings, A indicates a disk of r iibber specially prepared for the erasure of type-written matter.

B B indicate two sheet-metal plates lying one on either side of the disk A, and in the ends ofwhicho enings are form: ed to receive an eyelet C, whic extends through these open- I ings and also through a central opening in the disk A. The ends of the eyelet are turned over, so as to hold the parts firmly together but permit rotation of the disk A thereon. The plates B B are extended on one side of the eyelet 0 beyond the periphery of the disk A, and a bundle of bristles l) is secured be tween then in the manner hereinafter de axis of the disk than the other.

scribed. The ends of the plates B B, between which the disk A is secured, are each so shaped as to provide two ortions, one extending a greater distance Tom the pivotal I The greater portion of each late may include the part' of the plate exten ing beyond the periphery of the disk to holdthe bristles when a brush is provided and preferably extends about one undred and eighty degrees around the piv- 'This portion, except as to the extension for (an axis of the disk-that is, it ineludes sub stantiallyall that portion lying below the horizontal diameter of the disk in Fig. 1'.

extends about e center to the holding the bristles, preferabl one-half the distance from t peri her'y of the disk.

T e remaining or lesser portion of theend of each of the plates B B is cut away, so as to overlie a much smaller part of the disk A. For this reason the portions of the ends of the plates B B which extend the greater distance from the center serve to stiffen the parts of the disk A adjacent thereto, so that when the eraser is new the part thereof adjacent to these larger portions may be used, and in doing so the disk will not flex to such extent as to render the operation of erasing slow and diilicultfHowever, when the eraser has been used-and worn away so much that the periphery er the disk lies c ose to the periphery of these larger portions the part adjacent to the portion 0 the endsof the plates which extends a less distance from the center can then be used. If this portion of the ends of plates B B were formed on an unbroken curve, the flexure ofthe'disk A when the eraser is being used would press the disk against this curved edge witlr'such. force as to cut into it. In accordance with my invention I avoid this cutting ofthe disk by scalloping the ends of the plates, so as to provide a series of discrete pro'eetions thereon. In this way the flexure of the rubber brings it into engagement with a series of curved edges, each separated from adjacent onesby substantial spaces, and if the edges of these curved projections should cut into the rubber the parts thereof} ting between the curved projections a d w ich would not be cut would hold the peripheral portion of the-disk. v to the central portion and permit of usin the eraser until it was worn own flush wit the edge of the plates.

In securing t tween the outer ends of the platesBB, I rovide a sheet-metal band (I, wrapped tig itly around the inner ends of the brist es, so as to hold them firmly, and with the band thereonis then inserted between the outer ends of the plates B B. A rivet d is then passed through openings in the bites and the band d and through the bum le of bristles andits ends turned over so no 10o 1e bundle of bristles D bethis end of the bristlesr05 serrated and the serrations turned inwardly, somewhat as shown. By this construction the bundles of bristles, each held together by its band (1, may be prepared in a preliminary operation, and the pressure of the band'on the bristles at one end thereof causes the other end to spread, as illustrated in the drawings. Also the single rivet shown serves to hold the parts firmly together, and when the ends of the plates B B are drawn together by this rivet the inwardly-turned serrations on the ends of the plates are carried 1 in among the bristles and assist in spreading them at their free ends.

. Having now described my invention, what I claim as new therein, and desire to secure by Letters Patent, is as follows:

1. An eraser having a pair of metallic plates, and a disk of rubber pivotally mounted between said plates, a portion of said plates about the pivotal axis of said disk extending a less distance from said axis than the remainingportion-and said portion exl tending the less distance from the axis being provided with discrete projections, substantially as set forth. i

2. An eraser having a pair of metallic plates, a disk of rubber pivotally mounted between said plates adjacen tto one end thereof, and a bundle of bristles secured between said plates at the other end thereof and beyond the periphery of the disk, the ends of said plates between which the disk is supported having a portion about the pivotal axis of the disk extending a less distance from said axis than the remaining portion and said portion extending the less distance from the axis being provided with discrete projections, substantially as set forth.

This specification signed and witnessed this 27th day of September, 1906.

EBERHARD FABER.

Witnesses:

W. E. EDGERLEY. C. C. FLEMING.

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