US703967A - Pencil-sharpener. - Google Patents

Description

No. 703,967. Patented July I, l902..

W. DBYRNE.

PENCIL SHABPENER. (Application filed Aug. 21, 1901!) (No Mudel.)

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UNITED STATES \VILLIAM OBYRNE, OF NEWV YORK,

N. Y., ASSIGNOR OF ONE-HALF TO WILLIAM WINTERS, OF NEW YORK, N. Y.

PENClL-SHARPEN ER.

SPECIFICATION forming part of Letters Patent No. 703,967, dated July 1, 1902. Application filed August 21, 1901. Serial No. 72,838. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM OBYRNE, a citizen of the United States-residing at and whose post-office address is New York, in the county of New York and State of New York, have invented new and useful Improvements in Pencil-Sharpeners, of which the following is a specification.

My invention relates to Sharpeners especially designed for sharpening lead-pencils, but also adapted for use inpointing skewers, toys, and other articles.

The primary object of the invention is to provide a pencil-sharpener which will be so constructed as to cut the wood of the pencil with the grain thereof instead of directly against the grain, thus avoiding the breaking or splitting of the wood and permitting a free shearing cut of the wood and an easy rotary movement of the sharpener.

A further object of the invention is to provide a sharpener which will avoid the too-abrupt pointing of the lead of the pencil and leave a lead point of a substantial and durable character, the angle of inclination of which will be less than that of the wooden portion of the point.

A further object is to provide a sharpener which will be self-adjusting to adapt it to pencils of varying size.

Another characteristic of the present invention is that it is so constructed as to be inclosed by a tubular cover or casing fitting over the sharpener when the latter is not in use and serving also as a support for a rubber eraser.

The construction of the improvement will be fully described hereinafter in connection with the accompanying drawings, which form part of this specification, and its novel features will be defined in the appended claims.

In the drawings, Figure 1 is a side elevation of a sharpener embodying the invention. Fig. 2 is a similar view of the sharpener with its inclosing casing in position thereon. Fig. 3 shows the sharpener in elevation and the casing in longitudinal section.

The reference-numeral 1 designates a hollow metallic cone formed witha spiral slot 2, extending throughout the length of the cone. The wall 3 of this slot is slightly depressed and sharpened to serve as the cutting edge of the device, andthe oppositewall 4 is beveled on its outer surface to guide the shavings as they pass through the slot. From the point 5 to its apex .the cone is inclined at a less acute angle than from said point 5 to the base of the cone, the purpose of this construction being to correspondingly reduce the angle of inclination of the finished lead point relatively to the wooden'portion of the point, and thus leave a lead point of increased thickness, insuring greater resistance to breakage.

From the base of the cone 1 depends a hollow cylindrical extension 6, formed integral with the cone and connecting the latter with a circumferentially-enlarged hollow portion 7, also formed integral with the cone and its cylindrical extension and having an annular shoulder 8, serving as a seat for the lower end of a tubular cover or casing 9, which is adapted to inclose the cone, as shown in Figs. 2 and 3, and extends above the cone a sufficient dis tance to adapt it to receive an eraser 10, inserted into its upper end. The cover or casingiis retained in position by the frictional engagement of its lower end with the cylindrical extension 6 of the cone.

. The portion 7 of the sharpener is milled or roughened, as shown at 11,- to afford a firm grasping surface for the thumb and fingers,

thus facilitating the manipulation of the device.

To adapt the sharpener to pencils of varying size, the extension 6 and finger-piece 7 are formed with a longitudinal slit 12, the upper end of which communicates with or intersects a horizontal slit 13, formed at the juncture of the base of the cone with the extension 6 and extending only part way around the base of the cone, thereby providing a yielding cylindrical extension.

The utility and operation of the implement will be readily understood. The spiralcu'tting edge operates in line with the grain of the wood, as distinguished fromthecut of a straight cutting edge against the grain, and the variation of the angle of inclination of that portion of the cone which operates upon the lead of the pencil I regard as an important feature of the invention.

The adj nstability of the sharpener to adapt it to pencils of larger diameter than that of the base of the cone is also an obvious advantage of the improved sharpener.

I claim A pencil-sharpener comprising a hollow cone, the angle of inclination thereof being less at its upper portion than that of the remainder thereof and formed with a spiral slot continuously extending throughout the length of the cone, including said upper portion, whereby a cutting edge is provided, a

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