Carpenter's pencil sharpener

Details Carpenter's pencil sharpener Carpenter's pencil sharpener

2000-04-24

2001-07-10

Watts, Douglas D (Department: 3724)

Cutlery

Static pencil sharpener

Work piece drawn over transverse, single edge cutter

C030S451000

Reexamination Certificate

active

06256892

ABSTRACT:

TECHNICAL FIELD
This invention relates to pencil sharpeners and, more particularly, pencil sharpeners adapted to sharpen the oval profile of a carpenter's pencil.
BACKGROUND OF THE INVENTION
Carpenter's pencils are used widely by carpenters, art students and any other persons who prefer to make very wide lines or shadings when making pencil drawings or markings. A standard carpenter's pencil presents a generally oval or rounded rectangular cross section. The pencils are made with a graphite lead core (of various hardness levels) surrounded by a wood covering.
While the carpenter's pencil is widely used, the problem remains how to sharpen such a pencil. The most common method is to whittle the pencil to form a rough point and then sandpaper same to the desired sharpness. In addition, differing manufacturers of carpenter's pencils may manufacture products having slightly different sizes. Thus, any device used to sharpen carpenter's pencils must be able to accommodate those variations in size.
There are a number of devices conceived to sharpen carpenter's pencils, ranging from the simple mechanism of placing a knife edge blade on a flat surface to very complex devices which sharpen all four sides simultaneously.
U. S. Pat. No. 5,077,903 entitled “Carpenter's Pencil Sharpener” which issued on Jan. 7, 1992 to Kreim discloses a motor operated carpenter's pencil sharpener having two rectangularly shaped openings, one a longitudinal opening the other a transverse opening. Two large diameter cylindrical cutting heads receive the long sides of the pencil, two small diameter cutting heads receive the short sides of the carpenter's pencil for sharpening.
U. S. Pat. No. 4,081,010 entitled “Pencil Sharpener For Non-Circular Section Pencils” which issued on Mar. 28, 1978 to Galli discloses a pencil sharpener for non-circular section pencils. A single cutting blade
9
is employed along with a series of cams.
U. S. Pat. No. 3,851,687 entitled “Pencil Sharpener” which issued on Dec. 3, 1974 to Jones discloses a pencil sharpener having spring biased cutting blades.
None of the known prior art disclose the device set forth herein.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a simple, rugged, easy to use pencil sharpener for carpenter's pencils.
It is a further object of this invention to provide a simple carpenter's pencil sharpener which can acconmodate different sizes of carpenter's pencils.
Further objects and advantages of the invention will become apparent as the following description proceeds and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.


REFERENCES:
patent: 741857 (1903-10-01), Welker
patent: 841391 (1907-01-01), Hall
patent: 1051658 (1913-01-01), Alkire
patent: 1531738 (1925-03-01), Davis
patent: 2642044 (1953-06-01), Mussguller
patent: 2982253 (1961-05-01), Herbold
patent: 3851687 (1974-12-01), Jones
patent: 4081010 (1978-03-01), Galli
patent: 4759129 (1988-07-01), Alpha
patent: 4918816 (1990-04-01), Alpha
patent: 4961451 (1990-10-01), Bucci
patent: 5077903 (1992-01-01), Kreim

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