Improvements in Knife Sharpeners.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Knife Sharpeners.
I, WILLIAM HENRY FRANCIS JOHNSON. residing at 1287 Herkimer Street, of
Brooklyn, in the State of New York. U.S.A. do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in Knife Sharpeners; the object thereof
being to produce a device of this character which can be successfully used by
unskilled persons without danger of accident. The device is adapted for alternate
action apon both sides of the knife blade, whereby a sharp and even edge can be
supplied thereto, and it is simple in construction, inexpensive and durable.
In the practice of my invention, I provide primarily a centrally located dise which
has recesses formed upon both sides thereof. Engaging with this disc upon the two
respective sides thereof are cutting discs, supplied respectively with tapering edges,
arranged adjacent to the said recesses of the central disc, which said edges are
serrated or milled for cutting a sharp edge upon the blade to be sharpened. These
said cutting discs are located in vertical series centrally of the recessed disc, upon
each side thereof, and they are held in place by means of a spindle which
clamps them tightly together and prevents any rotary or lateral motion
thereof. This said spindle is screwed into a handle which is adapted for use
in operating the device, or the spindle may form an integral part of the handle and
it may be riveted at the outer end for fastening the discs.together.
In the operation of the device, a user will grasp the handle in the left hand, and
draw the blade between the central disc and the beveled surface of the upper disc,
until a tapering edge is formed upon the blade. The blade is then placed between
the lower surface of the central disc and the beveled edge of the lower disc and
drawn until a reverse taper is placed thereon, whereby a sharp and even cutting edge
will be supplied.
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Improvements in Knife Sharpeners.
I, WILLIAM HENRY FRANCIS JOHNSON, residing at 1287, Herkimer Street, Brooklyn,
in the County of Kings, and State of New York, United States of America. 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 improvements in Knife Sharpeners; the object thereof

page_text: being to produce a device of this character which can be successfuily used
by unskilled persons without danger of accident. The device is adapted for alternate
action upon both sides of the knife blade, whereby a sharp and even edge can be
supplied thereto, and it is simple in construction, inexpensive and durable.
The invention will be hereinafter fully described and specifically set forth in the
annexed claims.
In the accompanying drawings forming part of this specification :
Figure 1 is a vertical elevation of my improved device.
Figure 2 is a vertical sectional elevation, taken on a line x-x of Figure 1.
Figure 3 is a plan view of the device; and
Figure 4 is a plan of one the cutters forming part thereof.
In the practice of my invention, I provide a disc A; this said disc has recesses a
formed upon both sides thereof. Engaging with this disc upon the two respective
sides thereof are cutting discs B and B', supplied respectively with tapering edges, b
and 6', which said edges are serrated or millel for cutting a sharp edge upon the
blade to be sharpened. These said cutting discs are located centrally of the disc A
upon each side thereof, and they are held in place by means of a spindle C which
clamps them tightly together and prevents any rotary or lateral motion of the
discs. This said spindle is screwed into a handle D, which is adapted for use in
operating the device.
I do not confine myself to the specific means employed for assembling the parts,
as the spindle may form an integral part of the handle and it inay be riveted at its
outer end for fastening the discs together.
In the operation of the device, a user will grasp the handle B in the left hand,
and draw the blade between the disc A and the beveled surface of the disc, B, until a
tapering edge is formed upon the blade. The blade is then placed between the lower
surface of the disc A and the beveled edge of the disc B¹ and drawn until a reverse
taper is placed thereon, whereby a sharp and even cutting edge will be supplied.
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. A knife sharpener, comprising two discs having beveled serrated edges, and an
enlarged disc having annular recesses upon each side thereof located between the two
s.id beveled discs, said parts being connected to each other concentrically and means
for connecting them, substantially as shown and described.
2. In a knife sharpener, the combination of a centrally located disc, having
annular recesses on each side thereof, and two beveled discs engaging respectively
with the said annular recesses, the said discs having their beveled edges serrated,
and a spindle for connecting the parts concentrically to each other and to a handle,
substantially as shown and described.
3. The combination of a handle with two discs having serrated beveled edges and
a centrally located disc having recesses therein engaging with the said beveled
edges, and a spindle for connecting the said discs to the handle, substantially as
shown and described.