Pencil sharpener

Details Pencil sharpener Pencil sharpener

1987-11-06

1988-07-26

Schmidt, Frederick R.

Cutlery

Static pencil sharpener

Plural, sequentially engaged cutters

30453, 144 286, B21D 3900, B43L 2302

Patent

active

047591293

ABSTRACT:
Disclosed herein is an improved pencil sharpener specifically designed to sharpen the end of a carpenter's pencil. As is well known, a carpenter's pencil has a substantially rectangular cross-section and as such can not be sharpened in a conventional pencil sharpener since conventional pencil sharpeners are designed to be used to sharpen pencils of circular cross-section. The inventive pencil sharpener is able to sharpen a carpenter's pencil by virtue of four cutter heads each of which having a cross-section subtending only a portion of the circumference of a circle and interconnected through gearing so that opposed cutter heads engage the pencil surface while the other cutter heads are spaced away from the pencil surfaces. As the first mentioned cutter heads move away from the pencil surface, the latter mentioned cutter heads rotate into position engaging the pencil surface so that a carpenter's pencil with a rectangular cross-section may be sharpened.

REFERENCES:
patent: 2853053 (1958-09-01), Hamilton

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