US2427852A - Typewriter erasing guard - Google Patents

Description

M. GOLOMB TYPEWRITER ERASING GUARD Filed Feb. 8, 1946 Sept. 23, 1947.

Patented Sept. 23, 1947 UNlTED STAT-ES PATENT OFFICE TYPEWRITER ERASING GUARD Mary Golomb, Washington, D. 0.

Application February 8, 1946, Serial No. 646,244

3 Claims.

This invention relates to typewriter erasing shields or guards, and more particularly to an erasing shield device to protect carbon copies from being smudged or defaced during the erasing process.

An object of the invention is to provide an improved typewriter erasing guard device which embodies a friction surface element for preventing slippage of the guard device during erasing operations, said friction surface element being also employed as a means for removing smudge adhering to the surface of the eraser.

A further object of the invention is to provide an improved typewriter erasing guard device which may be made of very inexpensive materials, said device being adapted to facilitate rapid and clean erasing of typewritten material without causing marking up of the underlying carbon copies.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is a perspective view of a typewriter erasing guard device constructed in accordance with the present invention.

Figure 2 is a detail cross-sectional view of a portion of the guard device taken on line 22 of Figure 1.

Figure 3 is a detail view in cross-section, similar to Figure 2, but illustrating a modification of the erasing guard device of the present invention.

Figure 4 is a cross-section view taken through a portion of a conventional typewriter illustrating the use of the typewriter erasing guard device of the present invention.

Figure 5 is a view illustrating the employment of the guard device of the present invention to remove smudge from the periphery of a typewriter eraser.

Referring to the drawings, H designates the body portion of a typewriter erasing guard device according to my invention, said body portion being of flexible sheet material such as celluloid or the like, and being preferably rectangular, although other desired shapes may be employed within the spirit of this invention. Along one edge of body portion l l a band of abrasive material is adherently secured to the surfaceof body portion ll, said band being of substantial width. Abrasive band I2 may be painted on, glued on, or may take the form of a flexible flat strip or sheet abrasive such as emery cloth or rubber impregnated with abrasive particles which is typewriter.

glued on to the surface of body portion l2 and has the form and shape shown in Figure 1.

As an alternative, the abrasive strip may be formed integrally with and indented directly into the surface of body portion H by knurling or serrating said body portion over a band thereof adjacent one edge, as shown at l3 in Figure 3.

The use of the erasing guard device is illustrated in Figure 4, wherein l4 represents the platen roll of a conventional typewriter and I5 represents a conventional paper clamping roll, or the usual equivalent thereof in a conventional The top written sheet is designated at IS, a sheet of carbon paper is designated at I! and a carbon copy sheet is designated at l8.

When material is to be erased from top sheet Hi, the guard device H is interposed between top sheet I6 and carbon paper I! with the lower friction band l2 (or I3) of the guard device in contact with the rear surface of top sheet l6 below the material to be erased. The platen roll I4 is then rotated in a counterclockwise direction, as viewed in Figure 4, causing the friction band to be wedged between sheet l6 and carbon paper l'l adjacent the clamping member IS. The guard device is thus held rigidly in position with respect to the paper l6 and. provides firm backing for the erasure of material therefrom. When the erasing operation is completed platen roll I4 is rotated clockwise, as viewed in Figure 4, thus releasing the guard device. The same procedure may be employed where multiple carbon copies are being made, the guard device being inserted behind each sheet to be erased in turn, the friction band engagingthe rear surface of the sheet below the erasure and being rigidly wedged with respect thereto during the erasing operation, thus providing a firm backing for each erasure.

To remove smudge from the eraser after the erasing operation has been completed, or before an erasing operation, the periphery of the eraser, shown at IS in Figure 5, is drawn over the friction band l2 (or I3) of the guard device and the smudge or dirt is thus abraded off the eraser rubbing surface. The eraser can then be employed with the guard device positioned behind the sheet being corrected, as described above.

It is readily apparent that by use of a guard device constructed as disclosed herein, rapid and clean erasing operations may be accomplished.

The smooth guard surface above the friction band may be perfectly clear, or may be alternatively employed to carry advertising data, calendar information, ruling scales, or other useful information.

While certain specific embodiments of a typewriter erasing guard device have been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore it is intended that no limitations be placed on the invention other than as defined by the scope of the appended claims.

What I claim is:

1. An erasing guard device comprising a cardlike member of flexible material having a smooth main body portion, said body portion being roughened over a band of substantial width.

2. An erasing guard device comprising a substantially rectangular member of stiff flexible material having a smooth main body portion, said main body portion being knurled along a band of substantial width adjacent one edge thereof to provide a friction surface.

3. An erasing guard device comprising a substantially rectangular member of stiff flexible material having a smooth main body portion, said body portion having abrasive material secured thereto over a band of substantial width adjacent one edge thereof to provide a friction surface.

MARY GOLOMB.

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