IMPROVEMENT IN PENCIL SHARPENERS
Year: 1885

page_text: J, OTTO BUSSLER, Jeweller, of Nürnberg, in the kingdom of Bavaria, do hereby
declare the nature of said Invention for "IMPROVEMENT IN PENCIL SHARPENERS,"
to be as follows:-
In pencil sharpeners hitherto known the blade serving to sharpen the lead is
rapidly worn, becomes blunt and choked, and is not easily cleaned or replaced.
The present invention illustrated in the annexed drawings, Figs. 1 to 4, relates
specially to improved means for producing an accurate point, while the cutting of
the wood is effected in the usual manner by oblique blades m.
The improvement chiefly consists in a scraping cone 8, which forms the
prolongation of the blades serving to cut the wood.
This cone is made of lardstone, emery or similar hard material which remains
constantly hard and which produces the point of the lead by scraping, instead of
cutting, as has hitherto been the case with steel blades. The improved apparatus
further comprises a pusherr made movable in the longitudinal axis of the
apparatus, and serving to remove the broken points of the lead and to clean
the sharpening cone 8.
The effect of the sharpening device 8-which may consist of separate scraping
surfaces or edges or of a hollow cone made of one piece,--considerably differs from
the effects of steel blades hitherto used.
The natural hardness and the more granular nature of the scraping cone
guarantees a constant sharpness in contradistinction to the metallic blades, which
are rapidly blunted. The pusher serving for cleaning and removing may be
connected with and controlled by a spring; or it may be mounted loosely, as
represented in the drawing.
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I, OTTO BUSSLER Jeweller of Nürnberg in the kingdom of Bavaria, do hereby
declare the nature of this invention, and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
In pencil sharpeners hitherto known the blade serving to sharpen them is
rapidly worn, becomes blunt and choked and is not easily cleaned or replaced.
The present invention, illustrated in the drawings filed with the provisional
an elevation, Fig. 3 a
specification, in which Fig. 1 is a longitudinal section, Fig.
sectional plan and Fig. 4 details, relates to improved means for producing an
accurate point, while the cutting of the wood is effected in the usual manner by
oblique blades m.
The improvement chiefly consists in a scraping cone s which forms the prolonga-
tion of the blades serving to cut the wood. This cone is preferably made of emery
or similar hard material, which remains constantly hard and which produces the
point of the lead by scraping instead of cutting as hitherto. The improved
apparatus further comprises a pusher made movable in the longitudinal axis
of the apparatus and serving to remove the broken points of the lead and to clean
the sharpening cone 8.
The effect of the sharpening device 8, which may consist of separate scraping
surfaces or edges or of a hollow cone made in one piece, considerably differs from
the effects of steel blades hitherto used. The natural hardness and the mere
granular nature of the scraping cone guarantees a constant sharpness in contra-
distinction to the metallic blades, which are rapidly blunted.
The pusher serving for cleaning and removing may be connected with and
controlled by a spring, or it may be mounted loosely as represented in the
drawing.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
1.) The combination of the knife or blade m, serving to cut the wood, with the
scraper or scrapers 8, made of or furnished with hard grinding material for
sharpening the point, substantially as described and illustrated.
2.) The movable pusher r, passing through the scraper for removing the broken
points and cleaning the apparatus, substantially as described and illustrated.