US2010103A

US2010103A - Eraser

Info

Publication number: US2010103A
Application number: US2988A
Authority: US
Inventors: Hans W Maucher
Original assignee: EBERHARD FABER PENCIL Co
Current assignee: EBERHARD FABER PENCIL Co
Priority date: 1935-01-23
Filing date: 1935-01-23
Publication date: 1935-08-06
Anticipated expiration: 1952-08-06

Description

Aug. 6, 1935. H. w. MAUCHER 2,010,103

ERASER Filed Jan. 23, 1955 NVENTOR TTORNEY Patented Aug. 6, 1935 ERASER Hans W. Maucher, West Orange, N. 3., assignor to Eberhard Faber Pencil Company, a ccrpcration of New York 7 Application January 23, 1935, Serial No. 2,988

6 Claims.

This invention relates in general to erasers and more particularly to'erasers especially adapted.

for attachment to pencils or caps which areused for protecting the pointed end of a pencil.

A prime object of the invention is to provide an eraser which shall embody novel and improved features of construction whereby a thin curved and sharp edge shall be provided for making erasures so as to avoid the difficulties usually encountered in the use of the usual cylindrical eraser mounted on the end of a pencil which frequently results in obliterating or blurrlngwritten matter adjacent the point at Which erasure is being made.

It has been proposed to apply circular or disk erasers to pencils or pencil caps, but such erasers are objectionable in that only a portion of the periphery of the circular eraser can be effectually utilized; in order to use the portions of the edges of such erasers at the sides of the pencil or cap, it is necessary to hold the pencil in practically horizontal position and inconveniently close to the paper or surface on which the erasure is being made. It has also been proposed to provide erasers of tubular form, for example as shown in Patent No. 447,87 3, dated March 10, 1891, but such erasers are objectionable in that the erasing edges easily collapse'under pressure necessary to make erasures, and difficulty is encountered in securely attaching the eraser to a pencil or pencil cap due to the flexibility of the walls of the tube.

Therefore other objects of my invention are to provide an eraser of the general character described which shall embody novel and improved features of construction whereby a thin sharp annular erasing edge shall be provided and shall be capable of use conveniently throughout the circumference or perimeter thereof; to provide such an eraser the structure of which shall insure a minimum of tendency of the annular erasing flange to collapse under erasing pressure; to provide such an. eraser the structure of which shall permit it to be firmly mounted on a pencil or pencil cap; and to obtain other advantages and results as will be brought out by the following description.

Referring to the accompanying drawing in which corresponding and like parts are designated throughout the several views by the same reference characters;

Figure 1 is a side elevation on an enlarged scale of an eraser embodying my invention at- Figure 3 is a top plan view of the eraser shown in Figure 2.

For the purpose of illustrating the nature of the invention, I have shown it in combination with a lead pencil although it should be understood that the eraser may be independently of a pencil or may be connected to a cap which is utilized for protecting the sharpened end of a pencil.

Specifically describing the illustrated embodiment of the invention, the reference character A designates the eraser which is shown as comprising a solid block of erasive material such as rubber. One end portion I of the block is solid while the other end has a longitudinally projecting an- 5 nular flange 2. This flange may be formed by a recess 3 in the end of the block, and preferably the basal perimeters at the inner and outer sides 4 and 5 of the flange are less than the perimeters at the inner and outer sides 6 and 1 respectively cf the free edge of the flange. Also, the flange preferably decreases in thickness from its base to its outer edge. With this construction, it will be observed that the flange 2 flares outwardly from the solid end portion of the block. 7

The flange 2 provides a thin sharp and annular erasing edge which can be conveniently used throughout its perimeter, and in using the flange for making erasures, the eraser need be only slightly tilted with its axis inclined only a few degrees to the vertical.

In use of the eraser, the solid end portion of the block may be gripped so as to bring a portion of the free edge of the flange into engagement with the matter to be erased, and the thinness and sharpness of the edge insures against obliteration or blurring of written matter adjacent that being erased. Any portion of the free edge may be utilized for making erasures, and by successively using adjacent portions perimetral- 40 ly of the flange, a sharp edge may constantly be maintained, as indicated at 9 by dot and dash lines in Figure 2. Preferably the plane of the free edge of the flange is perpendicular to the axis of the block although this is not necessary.

For applying the eraser to a pencil B, the pencil has a ferrule C or the like secured to one end and providing a socket, and the solid end portion of the eraser has a straight reduced extension 8 coaxial with the block and snugly fitted into the socket, as clearly shown in Figure 2; The pencil serves as a rod like handle to permit convenient gripping and manipulation of the eraser.

The solid end portion 5 of the eraser provides a support for the erasing flange 2 and reenforces the flange against collapsing under pressure incident to making erasures. The tendency of the flange to collapse is also restrained by the outwardly flaring relation of the flange to the solid end portion, and by the gradually increasing thickness of the flange from its free edge to its base.

The eraser being approximately coaxial with the pencil, and the plane of the free edge of the erasing flange 2 being approximately perpendicular to the axis of the pencil, the eraser may be conveniently used throughout the perimeter of the flange 2 with a minimum of tilting of the pencil from a position perpendicular to the surface upon which the erasure is being made. The solid end portion l of the eraser also provides for a firm and secure attachment of the eraser to a pencil or the pencil cap, and it will be observed that the eraser may still be used even after the flange 2 has been worn away.

While the eraser is preferably approximately circular in plan View as shown in Figure 3, it will be understood by those skilled in the art that the shape of the eraser may be modified without departing from the spirit or scope of the invention.

Having thus described my invention, what I claim is:

1. As a new article of manufacture, an eraser comprising a solid block of erasing material having an integral annular perimetral flange projecting longitudinally from one end thereof whereby said flange forms a thin erasing edge and the other solid end portion of the block serves as a'holding means and reenforces the flange against collapse.

2. As a new article of manufacture, an eraser comprising a block of erasive material one end of which is solid and the other end of which has a coaxial recess forming an annular longitudinally projecting flange to provide a thin annular erasing edge.

3. As a new article of manufacture, an eraser comprising a block of erasive material one end of which is solid and the other end or" which has a coaxial recess forming an annular longitudinally projecting flange to provide a thin annular erasing edge, said flange also flaring outwardly toward said edge.

4. An eraser comprising a block of erasive material one end portion of which is solid while the other end has an annular longitudinally projecting flange whose inside basal perimeter is less than the perimeter of the inside of its free edge and the thickness of said flange increases from its base to its free edge.

5. An eraser comprising a block of erasive material one end portion of which is solid While the other end has an annular longitudinally projecting flange whose inside basal perimeter is less than the perimeter oi" the inside of its free edge and the thickness of said flange increases from its base to its free edge, said flange flaring outwardly from said solid end portion.

6. An eraser comprising a block of erasive material one end portion of which is solid while the other end has annular longitudinally projecting flange whose inside and outside basal perimeters are less than the perimeters of the inside and outside of its free edge respectively.

HANS W. MAUCHER.