US2469049A

US2469049A - Pencil with body of convolutely wound paper

Info

Publication number: US2469049A
Application number: US733735A
Authority: US
Inventors: Miller Kay
Original assignee: Joseph Dixon Crucible Co
Current assignee: Joseph Dixon Crucible Co
Priority date: 1947-03-11
Filing date: 1947-03-11
Publication date: 1949-05-03
Anticipated expiration: 1966-05-03

Description

y 1949- K. MILLER 2,469,049

PENCIL WITH BODY OF CONVOLUTELY WOUND PAPER Filed March 11, 1947 Patented May 3, 1949 UNITED STATES PATENT OFFICE PENCIL WITH BODY OF CQNVOLUTELY WOUND PAPER Application March 11, 1947, Serial No. 733,735

2 Claims. 1

This invention relates to pencils or marking instruments and, more particularly, to a pencil having a core of suitable marking material, such as a graphite composition or crayon commonly known as lead, encased in a sheath formed of sheet material Wound or coiled around the core.

One of the difiiculties encountered with such a pencil is to obtain a composition sheath which will have the required transverse strength, will tightly grip the core or lead, and can be readily sharpened by a knife or other sharpening tool.

This invention has for its salient object to provide a pencil having a sheath of such composition that it will have the required transverse strength, will tightly grip the core, and can be readily sharpened by a knife or other suitable sharpening tools, such as a rotary sharpening device.

Further objects of the invention will appear from the following specification taken in connection with the drawings which form a part of this application, and in which Fig. 1 is a perspective view showing a blank adapted for use in forming the pencil embodying the invention;

Fig. 2 is an end elevation of the blank, partially coiled to form a sheath; and

Fig. 3 is a transverse sectional elevation, on an enlarged scale, of the pencil embodying the invention.

The pencil is preferably formed from a sheet or strip formed of paper pulp and cut to the desired length and width. Fig. 1 illustrates somewhat diagrammatically a blank ll] of paper formed from paper pulp and it should be noted that the pulp fibers l l have been oriented so that they are disposed in substantially parallel relation. This is accomplished and in the paper forming machine, the major portion of the fibers being oriented in substantially parallel relation,

and the paper sheet or strip as it is formed on the Fourdrinier machine travels in the direction of the arrow X in Fig. 1. The blank N], therefore, is cut transversely of the strip.

This sheet, in order to be suitable for use in forming a pencil sheath, may be treated or aged to partially char the paper. Various methods of accomplishing this may be employed, as, for instance, those shown in my Patents Nos. 2,352,444 and 2,375,696. The blank it having the fibers ll arranged substantially as shown in Fig. l is wound in any suitable manner around the core 12 of marking material, such as a graphite core, commonly termed a lead core.

The arrangement of the fibers I I in the manner described disposes the majority of the fibers substantially parallel to the axis of the pencil, thereby giving the desired transverse strength.

This arrangement has a further advantage in that when the paper sheet is wrapped around the core under some tension, as disclosed in my Patent No. 2,259,959, it is wetted with a suitable adhesive, and when subsequently drying, a considerably greater shrinkage takes place transversely than longitudinally, thus obtaining a tight grip on the core throughout its length, and at the same time the longitudinal shrinkage is not enough to disturb this tight grip in drying.

In order to further facilitate the sharpening of the pencil and to provide a sheath that can be easily sharpened, the sheet or blank It! is impregnated with a suitable lubricant which may be applied in any suitable manner, as by spraying from a nozzle, as shown in Fig. 1. If desired, the lubricant can be added to the pulp solution before the paper pulp is disposed on the Fourdrinier wire. The lubricant may consist of paraflin, oils, greases, waxes, paraffin being preferred.

It will be understood that before the blank is coiled around the core l2, a suitable adhesive is applied, such, for instance, as sodium silicate, in order that the successive convolutions may be secured together.

Although one specific embodiment of the invention has been particularly shown and described it will be understood that the invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made without dcparting from the spirit or scope of the invention, as expressed in the following claims.

What I claim is:

1. A pencil comprising a core of marking material and a sheath enclosing the core consisting of flexible paper pulp material wound around the core and having the fibers of the sheet material disposed substantially parallel to the longitudinal axis of the sheath, the convolutions being secured together by a suitable adhesive, the paper pulp material of said sheath being impregnated with a lubricant.

2. The method of forming a pencil which consists of winding a sheet of paper pulp material, impregnated with a lubricant, into a sheath around a core of marking material, with the fibers disposed substantially parallel to the core axis, and securing successive convolutions by a suitable adhesive.

KAY MILLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,595,856 Clark Aug. 10, 1926 2,272,126 Miller May 8, 1945