US2386948A - Typewriter eraser - Google Patents

Description

j 0a. v16, 1945.

TYREWRITER ERASER Filed vJune 19, 1945 MM VM ATTORNEYS B. w; HANLE 2,386,948l

l Patented Oct. 16, 1945 TYPEWRITER ERASERV Benjamin W. Hanle, Elizabeth, N. J., assignor to Eagle Pencil Company, a corporation of Dela- Ware Application J une 19, 1943, Serial N o. 491,569

2 Claims. (Cl. 1Z0-36) The present invention relates to typewriter erasers, more particularly of the type combining in a unitary structure the eraser and a brush for removing the erasure detritus.

Among the objects of the invention are to provide an eraser of the above type of simple, compact, rugged, inexpensive and attractive construction which is easy to package, well balanced for facility of use and which admits of ready replacement of the eraser disk and of re-use of the brush and the associated holder structure.

In the accompanying drawing, in which is shown one of Various possible embodiments of the several features of the invention:

Fig. 1 is a plan View of the brush, viewed from one face thereof,

Fig. 2 is a View similar to Fig. 1 showing the opposite face of the unit,

Fig. 3 is a transverse sectional View taken on line 3 3 of Fig. 1 and upon a somewhat larger scale,

Fig. 4 is a perspective View of the lbundle of brush bristles prior to assembly with the eraser, and

Fig. 5 is a sectional view similar to Fig. 3, but on a smaller scale, showing the operation of installing a replacement eraser disk.

Referring now to the drawing, the conventional disk IB of suitable eraser material is centrally perforated as at I I and is clamped between a pair of coacting clamp heads I2 and I3, preferablyl concave at their outer faces as atl I4 for convenience of gripping by the thumb and index finger. The clamp heads are provided with unitary central studs. The clamp head I2 has a cylindrical axial stud I5 which is telescoped snugly and frictionally into a correspondingly larger hollow cylindrical stud I6 on the companion clamp head I3 that fits the central perforation l I of the disk. Desirably the clamp head I3 has a short inner stud I'I coaxial with the hollow stud IB to afford an annular trough I8 therebetween for secure frictional clamping of the rim of stud I5 on the companion head.

Brush holder I9 has a wide carrying extension radially along the eraser disk and integral at its root end with clamp head I3. The brush holder has opposite faces parallel to the faces of the eraser, face 2I being desirably substantially in* the plane of eraser face IU. The end walls of the eraser holder are at right angles tothe faces of the eraser. The holder presents a rectangular socket which has an inner end wall 22 against which the eraser root abuts, as best shown in Fig.

3. Desirably the brush holder is molded with a 55 head pressed bevelled base 23 that extends along an arc contiguous to the periphery of the eraser disk.

The brush is made of a bundle of bristles 24 centrally Ibent as at 25 into a hair-pin turn and bound together at said bend by a suitable cord or wire 26. The lateral walls of the brush holder I bring the bundle of bristles, shown in Fig. 4, together into the brush formation shown in Figs. 1 to 3'. A transverse pin 21 is introduced through the face walls of the brush holder to be straddled by the hair-pin turns of the bristles and thereby to anchor the brush firmly in position, as best shown in Fig. 3.

The .brush and eraser holder are preferably ofplastic material, desirably of cellulose acetate, of light weight and attractive appearance.

In use the frictionally coacting eraser clamp heads I2 and I3 retain the eraser disk securely against movement relative thereto even under vigorous eraser pressure. The brush extends substantially in the plane of the eraser proper, nearly midway between the planes of the clamp heads I2 and I3 so that the structure is Well balanced in the brushing operation.

When the eraser has been used up, it may readily be replaced by simply introducing a letter opener or similar dull tool between one of the clamp heads I2 or I3 and the eraser disk I0, thereby releasing the remnant of the rubber disk which may be replaced by a fresh eraser disk in the manner best shown in Fig. 5. 'I'he clamp heads I2 and I3 are readily introduced through opposite ends of the eraser perforation II and the two clamp heads are securely assembled together by pressure against the clamp heads, which snaps the studs into frictional coaction.

The relatively unperishable holder for the eraser and the relatively unperishable brush may thus be re-used indefinitely with fresh replacements of the eraser.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. A typewriter eraser'comprising a centrally perforated eraser disk, and a two-part holder clamp, comprising .an imperforate clamp disk against one face of the disk, having stud, the other head'having a short central stud 10 encompassed by the rim of said cylindrical stud and an outer cylindrical stud concentric therewith, snugly and frictionally encompassing the length of the stud on the first head and fitting in the perforation of said disk, whereby the rim of the rst stud is snugly lodged in the trough dened between the encompassed and encompassing Stud Qf the other clamp head.

BENJAMIN W. HANLE.

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