US1620236A - Pencil knife - Google Patents

Description

J. SCHICK PENCIL KNIFE March 8, 1927.

Filed Oct. 10, 1923 AT RNEY f Patented Mar. 8, 1927.

UNITED, STATES 1,620,236 PATENT OFFICE.

JACOB SCHICK, 0]? ORANGE, NEW JERSEY, ASSIGNOR TO MILLER REESE HUTCHISON,

OF WEST ORANGE, NEW JERSEY.

PENCIL KNIFE.

Application filed October 10, 1923.

This invention relates to an improved pencil knife which is of the type that embraces the pencil so as to firmly grasp it and which has a blade extending from one end to fit the pencil snugly and thus have its edge shielded so as to prevent cutting of the clothing or fingers.

The present invention is particularly designed for round pencils and the barrel portion which fits the pencil is used as a handle when the blade is to be used and the blade being narrow and sharply curved is particularly constructed so that it cuts the wood of the pencil easily in sharpening.

The invention is illustrated in the accompanying drawings in which Figure 1 is a perspective View of a pencil sharpener with my improved pencil knife attached. Figure 2 is a cross section of the knife on an enlarged scale and taken on a plane passing through the blade. Figure 3 is a back view of the blade and part of the barrel portion. Figure 4 is a View to more fully bring out the functioning of the blade and Figure 5 is a perspective view of the knife with a part struck up to form a clip.

The barrel portion 10 is made of thin spring metal to firmly embrace a pencil and is made cylindrical to fit around a round pencil and to be held thereon by friction. I usually split'the barrel portion and have cut-away portion'll so that the fingers 12 are sufficiently flexible to compensate for slight differences in size of pencils. From one end of the barrel portion and longitudinally thereof I extend the blade 13 which is the same curvature as the barrel. portion and fits against the pencil to guard the edge from being drilled and to guard fingers and clothing against being cut.

A blade of this kind to fit a pencil is only about five thirty-seconds of an inch wide and being somewhat sharply bent, the edge when sharpened and used on the wood of a pencil when the blade is held in the usual cutting position enters the wood at too sharp an angle so that it cuts too deep and is checked or when used lightly it chatters and makes a series of short jabs instead of taking off a continuous cutting. To overcome this I provide the inner radius or face of the blade with a cutting edge that is off-set from the said face and tangential thereto. This face is shown at 14 and is in a plane Serial No. 667,729.

to pass through the other edge. I usually sharpen both edges so that a grinding to make these edges in the same plane gives enough bearing and same result as a fiat blade. To illustrate what I mean, I show a flat blade relative to the dotted outline of the barrel portion and the parts 15 between the dotted circles bear the same relation thereto as the parts 14 of my knife. The absence of the interveningpart 16 in my knife also reduces friction to make the operation of the knife easy as the blade bears on the work only on its edges but these edges are tangential to the inner edges but off-set therefrom. r

This off-set edge, however, is not projected sufficiently to expose it appreciably beyond the surface of the pencil since the radius of the pencil and the thickness of the metal in the knife gives the appearance of the edge being close against the pencil. The outer face of the blade at the edges is usually tapered by grinding as at 18 to give the cutting edge but slight offset relative to the inner radius or face.

WVhen removed from the pencil for sharpening the barrel portion serves as a handle as the fingers 12 on the sides provide a firm grip on the barrel which is usually plated or highly polished and is therefore slippery.

WVhen on the pencil the knife can be used as a clip since the clip 17 struck from the barrel portion and being made of spring metal securely holds the pencil in a pocket.

I claim: N

1. A pencil knife comprising a cylindrical barrel portion to fit around a pencil and a blade of the same radius projecting from one end said blade having its edges ground on the inner face and in the same plane to' provide a substantially flat bearing for the blade when sharpening a pencil.

2. A pencil knife comprising a cylindrical split barrel portion to embrace a pencil and having an extension on one end to conform to the pencil and to form a blade the inner face of one edge being flattened in a plane passing through the other edge to form a substantially fiat bearing for the blade when cutting.

In testimony that I claim the foregoing, I have hereto set my hand, this 21st day of August, 1923.

JACOB SCHICK.

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