Improvements in Pocket Knives.
Year: 1895

page_text: Date of Application, 2ûth Aug., 1895-Accepted, 19th Oct., 1895
COMPLETE SPECIFICATION.
Improvements in Pocket Knives.
I, FRIEDRICH DETERMANN of Elberfeld in the German Empire, Breite-
strasse 39, Merchant 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 :-
My invention has for its object a pocket knife with arrangement for sharpening
pencils and the like. The cutter is formed by the blade, which in the closed state
for the sharpening purpose is held fast and which may be adjusted corresponding
to wear and tear.
13
By the arrangement used by me a special sharpening apparatus is spared.
Without opening the blade the pencil may be easy and fine sharped and the
great advantage is gained that a taking off of the blade for whetting
unnecessary which however is the case with the cutters of the known pencil
sharpening apparatus.
On the accompanying drawing my invention is shown and described hereafter.
Figure 1 is a side view of the knife
;
Figure 2 is a front view of the same;
Figure 3 is a plan;
Figures
and 5 are cross sections along line I-I, II, II of Figure 1;
Figures 6 and 7 are modifications of my invention.
By a is represented the knife which is constructed generally in a well known
manner.
Into the end of the knife opposite the rivet I cut a conical hole into
which enters the blade e in such a way that between the wall of the hole and
the blade is formed a free space corresponding to the thickness of the chip to be
cut off.
The direction of the hole 6 must be so that the point of the pencil may be
touched by the blade.
Now for sharpening the pencil the blade must be held fast which is done in the
following manner. At one side it is provided with a projection d running in an
obtuse direction to the edge of the blade.
Into the haft of the knife is cut a slot in which is placed a sliding piece that
may be moved to and fro. The inner face or head of this piece is U shaped
corresponding to the projection d and now it will easy be understood how the
sliding piece surrounding the projection with its head will hold fast the blade and
force the same to be raised or lowered when pushed for or backwards on account of
the obtuse direction of the projection. When now the blade is caught in such a
way the sharpening of the pencil may take place, for turning out the chips the
hole is provided with a slot g.
For opening the knife the sliding piece must be brought out of contact with the
projection.
In Figure 7 is shown a modification of my invention, in which an other
construction of the catching arrangement for the blade is provided for. Instead
of the projection into the blade is cut a groove which serves for taking up
the point
of a sliding piece i which is guided in the same manner as before. But the slot <<
is formed a little obtuse which is done for the purpose of getting the sliding piece
out of the groove when the knife should be opened.
By Figure 6 is represented a knife with a round haft.

page_text: The conical hole may be also, if found necessary, cut in a special metal piece
which is fixed to the knife and also an other arrangement for fixing the blade
may be provided for, for instance a ferrule as it is shown in dotted lines on
Figure 7.
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:
A pocket knife having at its end a conical hole which is provided with a slot for
entering the blade and a slot for turning out the chips, the blade being provided
with an obtuse directed projection or groove which is brought in contact with a
sliding piece guided in the haft of the knife for catching the blade during the
sharpening process and to adjust it corresponding to wear and tear.
Dated this 19th day of August 1895.
FRIEDRICH DÉTERMANN,
By A. Dáumas,
Attorney.