Improvements in Pocket Sharpeners for Lead Pencils.
Year: 1891

page_text: Date of Application, 23rd Nov., 1891
Complete Specification Left, 19th Aug., 1892-Accepted, 24th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Pocket Sharpeners for Lead Pencils.
1, ALBERT MAECKER of Elberfeld Rhenish Prussia, Germany Manufacturer do
hereby declare the nature of this invention to be as follows :-
This invention relates to an improved pocket apparatus for sharpening lead and
other pencils by means of which a fine point is obtained, without breaking the lead
or other writing material and in which the knife can be accurately adjusted to the
depth of the cut and the thickness of the shaving taken off from the wood casing of
the pencil and also for wear and tear..
the
The arrangement and construction of the improved pocket sharpener is shown on
accompanying drawing in which
Fig. 1 is a view looking at the face of the knife,
2 is a top view from the pointed side.
39
3 is a bottom view from the broad side,
22
::
4 is a section along line,
5 is a section central through the mandril,
6 is a section along line y y.
The instrument consists of a wedge shaped piece of metal A, by preference made
of aluminium on account of its lightness; at one side it is provided with a hollow
cone B. The cone is so placed with regard to the upper face F of the wedge
piece, that the surface F nearly forms the tangent plane of the cone surface and
going through the point of the cone and forming a very small acute angle with the
tangent plane. Vertically to this plane and in an axial direction the material
forming the circumference of the hollow cone is cut out, so as to form a triangular
opening, into which the adjustable knife H reaches and thus the thickness of the
cut or shaving is determined and diminishing very slightly towards the point of the
cone.
The use of the instrument is similar to that of other instruments of the kind :
the pencil to be pointed or sharpened, is inserted into the cone and whilst the
instrument is held fast in one hand, the pencil is turned round and pressed
gradually forwards by the other hand, in consequence of which operation a thin
shaving is cut off and the wood casing as well as the lead in the same receives a
nicely shaped conical form with a fine point; the shaving or thickness of the cut
being very thin towards the point. the lead is guarded from being broken off.
Dated this 10th day of November 1891.
KARL J. MAYER,
Agent for A. Maccker.
COMPLETE SPECIFICATION.
Improvements in Pocket Sharpeners for Lead Pencils.
I, ALBERT MAECKER of Elberfeld Rhenish Prussia Germany, Manufacturer 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 :-
This invention relates to an improved pocket apparatus for sharpening lead and
other pencils by means of which a fine point is obtained without breaking the lead
or other writing material and in which the knife can be accurately adjusted to the
depth of the cut and the thickness of the shaving taken off from the wood casing of
the pencil and also for wear and tear.

page_text: The arrangement and construction of the improved pocket sharpener is shown on
the drawing lodged with the Provisional Specification.
Fig. is a view looking at the face of the knife;
2 is a top view from the pointed side;
:
31
2)
3 is a bottom view from the broad side;
"
4 is a section along line
22
5 is a section central through the mandril;
"
6 is a section along line y-y.
The instrument consists of a wedge shaped piece of metal A, by preference made
of aluminium on account of its lightness; at one side it is provided with a hollow
conc or conical boring B. The cone is so placed with regard to the upper face F
of the wedge piece that the surface F nearly forms the tangent plane of the cone
surface and going through the point of the cone and forming a very small acute
angle with the tangent plane. Vertically to this plane and in an axial direction
the material forming the circumference of the hollow cone is cut out, so as to form
a triangular opening E, into which the adjustable knife H reaches, and thus the
thickness of the cut or sharing is determined and diminishing very slightly towards
the point of the cone.
The use of the instrument is similar to that of other instruments of the kind:
the pencil to be pointed or sharpened, is inserted into the cone and whilst the
instrument is held fast in one hand, the pencil is turned round and pressed
gradually forwards by the other hand, in consequence of which operation a thin
shaving is cut off and the wood casing as well as the lead in the same receives a
nicely shaped conical form with a fine point; the shaving or thickness of the cut
being very thin towards the point, the lead is guarded from being broken off.
Having now, particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what i
claim is :
In a pocket sharpener for lead pencils the combination of a wedge shaped
piece A having a hollow conical boring B at one side and a triangular opening E
with an adjustable knife H having slotted holes 1, for fixing and adjusting it
upon the piece A. so that its cutting edge reaching into the triangular opening E
forms a very small acute angle with the longitudinal tangent of the cone surface."
Dated this 16th day of August 1892.