US2283107A - Eraser for pencils and holding tips therefor - Google Patents

Description

K M 9 m 9 mm a .lv w W 3 $1M. m% A May 12, 1942. H. B. VAN DORN ERASER FOR PENCIL AND HOLDING TIP THEREFOR Filed May 22, 1941 Patented May 12, 1942 ERASER FOR PENCILS AND HOLDING TIPS THEREFOR Horace B. Van Dorn,

Maplewood, N. J., assigncr to Joseph Dixon Crucible Company, Jersey City, N. J a corporation of New Jersey Application May 22, 1941,"Serial-No. 394,586 1 Claims; (o1.'120 s8) The invention relates to an improvement in pencil erasers and in holding means therefor by which the eraser is mounted on the end of the sheath enclosing the marking material of the pencil. The sheath of the pencil, of which the marking material may be graphite, crayon or the like, is commonly composed of wood or paper and in form may be either cylindrical or polygonal. The means for holding the eraser on one end of the pencil is commonly a metallic ferrule,

although ferrules composed of a phenolic compound are also used. The eraser itself may take a variety of forms, as cylindrical, fiat-rectangular or other polygonal forms.

One object of the present invention is to provide a pencil with an improved eraser element of which the ferrule is preferably composed of a phenolic compound and the eraser is rectangular in front elevation and relatively thin in side elevation, a form of eraser which has proved satisfactory in use, as giving relatively long and convenient service. A further object of the invention is to improve upon the form of the pencil eraser and the eraser holding tip so that they can be produced more cheaply than articles of similar manufacture have heretofore been produced. To the accomplishment of these ends the invention consists in the improved eraser and holding tip therefor fully described hereinafter and particularly pointed out in theappended claims.

In the accompanying drawing illustrating the preferred form of the invention, Fig. 1 is a front elevation of a pencil having at one end the improved eraser and holding tip therefor; Fig. 2

is a side elevation on an enlarged scale of the upper end of the pencil shown in Fig. 1; Fig. 3 is a section taken on the line 3-3 of Fig. 1; Fig. 4 is a top plan View of the pencil shown in Fig. 2 Fig. 5 is a transverse sectiontaken on the line 5-5 of Fig. 1; and Fig. 6 is a view similar to Fig. 5 of a modified form of the invention.

The improved eraser and holding tip therefor is adapted to be mounted on one end of any usual or preferred form of pencil having an elongated core of marking material 8 enclosed in a sheath-9 composed of wood or similar casing material. The sheath 9 may be cylindrical, hexagonal as shown, or of other contour in cross section.

The improved eraser holding tip is indicated generally at I!) in Fig. 1 and is composed of a synthetic resin or molded phenolic or other plastic material, although it may conveniently be composed of metal, such as brass. The eraser .tion ll of the eraser holding holding tip comprises a tubular inner end or.

neck portion l I which may be cylindrical in gen-' eral outline and is provided with an axial bore I 2' adapting it for mounting upon one end.l3

of the pencil. The bore l2 in the tubular portip and the end I3 of the pencil may be of any preferred contour in cross section, and various'means may be employed, as an adhesive or screw threading, or driven or tension fit, for securing the tip on the end of the pencil so that it will not be accidentally dislodged therefrom. I

The outer end of the tip constitutes the eraser holding portion of the tip and is' a bifurcated formationv consisting of the jaws or walls [4 and I5 formed integrally at the middle portion I9 of their inner ends with the neck portion ll of the tip. Axially the inner surfaces l6 of the walls l4 and [5 are straight, whereas in cross section they are preferably concave, as clearly indicated in Figs. 4 and 5, although they may be parallelly arranged transversely. I prefer to make the inner surfaces iii of the .eraser holding portion of the .tip somewhat concave as shown so that the lateral end portions ll of the walls l4 and I5 will be closer part thereof, by which I8 is prevented from moving laterally. The Walls l4 and 15 of the eraser holding portion of the tip are at the inner-ends [9 thereof, as stated, integrally connected with the outer end of the tubular portion ll of the tip, but since the neck portion H ofthe tip is cylindrical whereas the eraser holding portion is shaped as two jaws or walls the wing portions ll of the walls l4 and I5 are separated from the neck portion II by the line of demarcation indicated at 29.

The eraser I8 is an elongated rectangle in front elevation, as shown in Fig. l, and in plan or transverse section is preferably an elongated oval, as shown in Figs. 4 and 5, although, it may be flat;v The convex sides 22 of the eraser are ficient, even with excessive use, to last throughout the life of the pencil to which the improved eraser and holding tip may be applied.

To assist in holding the eraser in the end of the tip l0 each of the inner surfaces of the walls l4 and 15 of the tip is provided with one or more together than the middle arrangement the eraser edges 25 of the walls side, whereas in Fig. 6

axially extending inwardly projecting ribs 28 which are received in longitudinally extending grooves 29 formed in the outer surfaces of the eraser. In Figs. 4 and the eraser and the holding tip are shown as being provided with one cooperating rib and groove on each cooperating the cooperating sides of the eraser and holding tip are provided such ribs and grooves, indicated at 30. It is obvious that the cooperating sides of the holding tip and eraser may have any preferred number of ribs and grooves.

The ribs 28 formed on the inner surfaces of the walls l4 and I5 of the eraser holding tip are.

only as long as the walls l4 and I5, whereas the grooves 29 in the outer faces of the eraser extend throughout the length of the eraser, as indicated in Fig. 3. This is because it is convenient to produce the erasers by an extrusion process. The ribs 28 and 3!! together with the concaving of the walls l4 and I5 of the eraser holding tip serve the doublepurpose of preventing the eraser from axial and lateral movement in the tip and of strengtheningthe walls [4 and I5. In order to give the holding tip still greater strength, especially at of the walls l4 and i5 meet with the; outer end of the tubular portion II of the tip,the outer faces of the tip are provided with longitudinally extending ridges 32, which as indicated in Figs. 2 and 3, are thicker at their middle portions, that is to say, at the point l9 wherethey cover the junction of the walls I l-and with the tubular portion I l of the tip. Fromthis point the ridges slope curvingly to the outer end of the walls 14 and I5, and to the inner end of the tubular portion II ofthe tip. Theeraser is-firmly anchored in the jaws or walls l4 and I5 by reason of the peculiar formation'of the cooperating grooved and ribbed concavo-convex surfaces of the eraser holding walls and the eraser. To decrease the possibility of accidental dislodgement, however, adhesive may be applied to these contacting surfaces.

Having thus described the invention, what I claim as new is: 1

1. The combination of an eraser and an eraser holding tip adapted for attachment to one end of a pencil, said eraser holding tip being composed of a synthetic resinous material comprising a tubular inner end adapted'for mounting over one end of a pencil and an outer'eraser holding end consisting of two-walls spaced apart and integrally connected at the middle portion of their inner ends with the outer end of the tubular portion'of the tip, the inner surfaces of said walls being concave laterally but straight longitudinally and each of said walls having at least oneinwardly projecting longitudinally extending rib, and-said eraser being of general rectangular outline in front elevation'and of elongated oval shape in transverse section, the convex surfaces adapted to be embraced by the concave inner surfaces of the walls of the tip, each convex outer surface of the eraser having at least one longitudinally extending groove adapted to I receive the longitudinally extending rib on the corresponding inner surface of the walls of the tip. i

2. The combination of an eraser which is of general rectangular outline in front elevation and of elongated oval form in transverse section each of the convex-outer surfaces of the eraser having with two the point H! where the inner ends at least one longitudinally extending groove therein, and an eraser holding tip adapted for attachment to one end of a pencil, said eraser holding tip being composed of a synthetic resinous material comprising a tubular inner end adapted for mounting over one end of a pencil and an outer eraser holding end consisting of two walls integrally connected at at least a portion of their inner ends with the outer end of the tubular portion of the tip, said walls being spaced apart and their inner surfaces being concave-transversely and straight axially to receive between them the convex outer faces of the eraser, said inner surfaces of the concave walls of the tip having at least one inwardly projecting longitudinally extending rib adapted to be received within the corresponding longitudinally extending groove in the eraser.

3. The combination of an eraser and an eraser holding tip adapted for attachment to one end of a pencil, said eraser holding tip being a unitary structurecomprising a tubular inner end adapted for mounting on one end of the pencil eraser being of general rectangular outline in front elevation and of. a thickness filling the space between the walls of the eraser holding tip, at least one of the outer surfaces of the sides of the eraser having a longitudinally extending groove adapted to fit over the inwardly extending rib on one of the walls of the eraser holding tip.v

4. The combination of an eraser relatively long, wide and thin, each of the side surfaces of the eraser having at least one longitudinally extending groove, and an eraser holding tip adapted for attachment to one end of a pencil, said. eraser holding tip being a unitary structure comprising a tubular inner end adapted for mounting on one end of the pencil and an outer eraser holding end consisting of two walls spaced apart to receive between them the eraser, the inner surface of each of the walls being provided with at least one inwardly projecting longitudinally extending rib adapted to be received within the corresponding groove on the outer side surface of the eraser. 1

5'. The combination of an eraser relatively long and wide and relatively thin, and an eraser holding tip adapted for attachment to one end of a pencil, said eraser holding tip being a unitary structure comprising a tubular inner end adapted for mounting on one end of the pencil and an outer eraser holding end consisting of two walls connected at their inner ends with the outer end of the'tubular portion of the tip, said walls being spaced apart to receive the eraser snugly between them and being of less length and width than the eraser, the inner surface of at least one of said walls having an inwardly projecting longitudinally extending rib throughout its length, and said eraser having on the outer surface of one of its sides a longitudinally extending groove adapted to receive the inwardly extending rib on one of the walls of the eraser holding tip.

HORACE B. VAN DORN.

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