An Improved Knife Sharpener.
Year: 1894

page_text: Date of Application, 22nd June, 1894
Complete Specification Left. 4th Feb., 1895-Accepted, 9th Mar.. 1895
PROVISIONAL STPCINICATIVA
An Improved Knife Sharpener.
I, FIDELIUS TSCHOFEN, of Rother Hof No. 8 Piaristengasse, Vienna, Austria,
Lieutenant, do hereby declare the nature of this invention to be as follows:-
According to my invention I construct a knife sharpener of two slabs or blocks
of unglazed porcelain, emery, or other suitable hard material that will have a
grinding or abrading effect upon steel, which slabs or blocks are held in a frame in
such a position as to form a more or less acute angle between them, the lower
edges being in close contact, so that the edge of a knife being introduced into the
angular recess between the blocks and pressed down into the apex thereof, each
block will on moving the knife to and fro, exercise a grinding effect on either side
of the edge such as to effectually sharpen the same. By preference I form the
faces of the slabs forming the angular recess with ribs or corrugations in the
direction from the outer end to the apex, and so arranged that the ribs of the one
slab fit into the grooves of the other one at the apex. The slabs are by preference
made with dove tailed side edges sliding into corresponding dovetail grooves of
the shaped frame, so as to be held by the latter in such manner as to be readily
removeable for reversing their position when worn or for being replaced by
new ones.
The frame may either be fixed to a handle or to a stand. The two inclined sides
of the frame may either be rigidly fixed or be adjustable so as to increase or decrease
the angle formed between them.
Dated this 22nd day of June 1894.
ABEL & IMRAY,
Agents for the Applicant.
I, FIDELIUS TSCHOFEN, of Rother Hof No. S Piaristengasse, Vienna, Austria,
Lieutenant, 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 :-
According to my invention I construct a knife sharpener of two slabs or blocks
of unglazed porcelain, emery, or other suitable hard material that will have a
grinding or abrading effect upon steel, which slabs or blocks are held in a frame in
such a position as to form a more or less acute angle between them, the lower
edges being in close contact, so that the edge of a knife being introduced into the
angular recess between the blocks and pressed down into the apex thereof, each
block will on moving the knife to and fro, exercise a grinding effect on either side
of the edge such as to effectually sharpen the same. By preference form the
faces of the slabs forming the angular recess with ribs or corrugations in the
direction from the outer end to the apex, and so arranged that the ribs of the one
slab fit into the grooves of the other one at the apex. The slabs are by preference
made with dovetailed side edges sliding into corresponding dovetail grooves of
3 Price sil

page_text: the V shaped frame, so as to be held by the latter in such manner as to be readily
removeable for reversing their position when worn or for being replaced by
new once.
The frame may either be fixed to a handle or to a stand. The two inclined sides
of the frame may either be rigidly fixed or be adjustable so as to increase or
decrease the angle formed between them.
Fig. of the accompanying drawing shews by way of example a perspective
view of a knife sharpener of the above described construction fitted with a handle.
Fig. 2 shews a plan of the saine.
A A are two slabs of suitable hard grinding material, the sides of which are
formed with a bevil, while the inner faces are formed with corrugations a a. These
slabs are secured in inclined dovetail grooves in a metal frame Beo that they can
be slid in and out of the same, the corrugations of the slabs being so arranged that
the ridges of the one slab fit into the hollows of the other slab at the lower end, so
that on introducing a knife between the slabs as shewn in dotted lines, the cutting
edge thereof will rest upon the intersecting ridges of the two slabs, and consequently
on drawing the knife backwards and forwards, the acute angle formed by the
intersecting ridges will have a sharpening effect on the edge of the knife.
The frame is secured in a handle C, and it has projecting wings 13 that serve
as a guard for the hand. The slabs A can be withdrawn and inserted in the
inverted position, should the lower parts become defective, or they can be replaced
by new ones. The faces of the slabs A might also be made without corrugations,
and with rounded lower edges, meeting each other.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim.is:-
1. A knife sharpener consisting of two slabs of hand grinding material having
corrugated faces nid held at an angle to each other in such manner that the
corrugations engage with each other at the bottom, substantially as described.
2. A knife sharpener consisting of two flat slabs of hard grinding material
removeably fitted with bevilled sides into the dovetail angular grooves of a frame
so that their lower rounded edges meet at an acute angle, substantially as
described.
3. A knife sharpener consisting of two slabs A A of hard grinding material
having corrugations a a and bevilled sides, and fitted into the dovetail augular
grooves of a frame B so that the corrugations engage with each other, substantially
as described.
Dated this 4th day of Fobruary 1895.
ABEL & IMRAY,
Agents for the Applicant.