US1916889A - Pencil sharpener - Google Patents

Description

July 4, 1933. H. A. MouLToN ET AL.

PENCIL SHARPENER Filed NOV. 5, 1932 Patented July 4, 1933 UNTED STATES Parent orties HERBERT A. IVIOULTON AND EVELYN L. MOULTON, OF PLYMOUTH, NEW HAMPSHIRE PENCIL SHARPENER Application filed. November 5, 1932. Serial N'o. 641,429.

rFhis invention relates to a pencil sharpener adapted to receive one end of a pencil and serve as an eraser holder', and to receive the pointed end of the pencil and serve as a point protector.

The invention is embodied in apencil sharpener which includes a one-piece cylindrical sheet metal tube having an end portion constituting a pencil socketI in which a v1.0 pencil may be rotated, an opposite end portion constituting an eraser socket, and an intermediate portion originally cylindrical and deformed to provide a knife holding rib projecting outwardly from the intermediate 5 portion, and a sharpening knife fixed in said rib and having a cutting edge projecting into said intermediate portion, the arrangement being such that the knife is adapted to sharpen a pencil rotated in said socket, the

2@ rib being formed and arranged to be grasped by digits of a hand holding the Sharpener and enable said digits to prevent the turning of the Sharpener with the pencil.

Of the accompanying drawing forming a g5 part of this speciication,-

Figure 1 is a perspective view showing the cylindrical tube before the deformation of its intermediate portion.

Figure 2 is a plan view, and Figure 3 a ,59 side view showing the Sharpener and a pencil inserted therein.

Figure 4 is a section on line 4 4 of Figure 2.

Figure 5 is a side view of the Sharpener 135 looking toward the side opposite that shown cludes a cylindrical end portion 12 constituting a socket adapted to receive and permit the rotation of a pencil 13, a cylindrical end portion 14 constituting a socket which may receive an eraser 15, and an intermediate portion 1G, coaxial with the end portions, and having an integral deformation constituting a hollow knife-holding rib. Said deformation may be formed by suitable instrumentalities changing the form of a portion of the tube shown by Figure 1 by inwardly displacing opposite sides of the tube as shown by Figure 2, and outwardly displacing other portions of the tube, to form a hollow rib composed of fiat parallel sides 17, a longitudinal neck portion 18 connecting the outer portions of the sides 17, and a transverse neck portion 18, substantially at right angles with the tube axis, connecting the pori4ons of the sides adjacent the tube portion 19 designates a sharpening knife having a back edge seated on the longitudinal rib neck 18, a relatively long end edge seated in the transverse neck portion 1Sa flat sides contacting with rib sides 17, and a cutting edge 2O projecting from the rib into the intermediate portion and inclined relative to the tube axis, as shown by Figures t and 5.

The rib is obliquely arranged relative to the axis of the tube, and to the axis of a pencil therein. The sides 17 of the rib are tangentially arranged as shown by Figures 6 and 7, so that the knife is tangential to the inserted pencil and adapted to sharpen the same when it is rotated.

The rib is formed and arranged to be grasped by digits 22 of a hand holding the sharpener, to prevent the Sharpener from turning with a pencil rotated by the other han-d.

The end portion, or pencil socket 12, may be provided with a slot 23 rendering said portion yieldingly expansibl-e, and the tube may be provided with the usual securing clip 24.

An opening 25 for the escape of shavings removed from the pencil by the knife is shown by Figures 5 and 6.

The metal of the tube displaced in forming the hollow rib is so disposed that the neck portion 18 is inclined outwardly froni its 'unction with the socket portion 12, as shown y Figures 3, 4 and 5. The back and cutting edge of the approximately triangular knife are oppositely inclined, as shown by Figure 8.

It will be seen that when the back edge and the wider end edge of the knife are seated as described on the longitudinal neck portion 18, and the transverse neck portion 18 of the rib, the knife is positively supported by said neck portions against force tending to displace it outward from the axis of the tube and endwise toward the socket 14. The knife may therefore be secured in its operative position wholly by the thrust. of its back and wider end edges against said neck portions, and by the frictional contact between the sides of the knife and the sides of the rib. The knife may be additionally secured to the rib by solder, or otherwise.

It will also be seen that the device is very simple, its only ess-ential parts being the deformed one-piece tube and the knife.

The seamless tube characterized as shown and described, rendersl the Sharpener strong and durable, the portion of the tube engag ing the knife being inexpansible so that the We claim:

As an article of manufacture, a two-piece pencil Sharpener composed of a seamless sheet metal tube having cylindrical end portions constituting socket-s in axial alignment with each other, and an intermediate portion having a deformation constituting a hollow' knife-holding rib projecting outward from one side of the axis of the tube, said rib including fiat parallel sides tangentially and obliquely arranged relative to the tube axis, a longitudinal neck portion connecting the outer portions of the rib sides and inclined relative to said axis, and a transverse neck portion substantially at right angles with the tube axis, said tube and rib being integral with each other, and a substantially triangular sharpening knife having a back edge seated on the longitudinal neck portion, a relatively wide end edge seated on the transverse neck portion, flat sides bearing on the sides of the rib, and a cutting edge projecting from the rib into the intermedi ate portion of the tube, the portion of the tube having said rib being inexpansible.

In testimony whereof we have aixed our signatures.

HERBERT A. MOULTON. EVELYN L. MOULTON.

knife cannot be accidentally displaced from its operative position.

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