Improvements in the Construction or a Duplex al pomer Steel for Knives and other Sharp Instruments of similar Description.
Year: 1885

page_text: Improvements in the Construction or a Duplex al pomer
Steel for Knives and other Sharp Instruments of similar
Description.
I JOHN FREDERICK LASHBROOKE of Number 89 County Road Walton in the
County of Lancaster Butcher, do hereby declare the nature of my invention for
IMPROVEMENTS IN THE CONSTRUCTION OF A DUPLEX SHARPENER OR STEEL FOR
KNIVES AND OTHER SHARP INSTRUMENTS OF SIMILAR DESCRIPTION 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 certain improvements in the construction of a
duplex sharpener or steel for knives and other sharp instruments of a similar
description and is so constructed that it will sharpen both sides of the sharp edge
of a knife or other sharp, instruments of similar description at the same time and
my invention also enables an unskilled person, to sharpen a knife or other sharp
instrument without fear of spoiling the edge or failing to effectually sharpen
such instruments aforesaid and to bring my invention into practical effect,
I construct it as follows:
The aforesaid Duplex Sharpener is made in two parts, one part forming an
oblong box or its equivalent and which part is made of any suitable metal or
substance with one end open and the other a V which is in the centre of the other
end leaving a sufficiently large opening at the top of the V and which forms a
point at the other end of the aforesaid V also sufficiently long to suit the purpose..
A piece of india rubber or its equivalent is made to form a spring inside the box
and the V is cut out of the piece of india rubber to fit the V in the box; four
pieces of steel wire or their equivalent are then placed on the face of each side of
the india rubber V the wires and india rubber being then forced into the box until
the wire presses tightly against the top of the V and the top of the box so that one
half of the diameter of the wire will be laying on the india rubber and the other
half outside of the V for the purpose of sharpening the aforesaid knives and other
sharp instruments the steel wires being made a little longer than the india rubber,

page_text: One end of each of the steel wires is bevelled so as to fit between the india
rubber and the top of the box, the other ends of the wires are made to fit in holes
made in the other half of the construction, namely, the part which fits in the
bottom of the box and so formed that a handle of suitable design can be attached
thereto. This part is made with a projection to slip in the bottom of the box and
a flange is made to project outside such box, two holes being made in the aforesaid
flange with countersunk holes for receiving the necessary screws and which screws
when placed therein run right through the box and india rubber and are tapped at
the other end of such box so as to fasten the said flange and the handle to the box
or sharpener. When the two parts of this construction are screwed together by the
aid of the screws the end that slips into the box will be made with holes to receive
the bottom of the steel wires.
The above being a general description of my invention that the same may be
more readily understood I will now proceed to describe with the aid of the drawings
hereto annexed and which form a part of this description how my invention may
be carried into practical effect by others skilled in the art to which it appertains
like letters and figures in the drawings being used to denote like or corresponding
parts throughout.
Figure 1 is a three quarter elevation of my invention of a Duplex Sharpener or
Steel for knives and other sharp instruments of similar description with a knife in
position for sharpening.
Figure 2 is a sectional elevation of figure 3 showing the parts that are inside
figure 1.
Figure 3. is a front view elevation showing front part of V where the knife
edge is placed for sharpening.
Figure 4 is a sectional elevation of piece of india rubber showing the V cut out
of the holes placed therein for the purpose of the screws passing through and
fastening the two parts of the invention together showing two of the steel wires.
Also a plan drawing of same.
Figure 5 represents oblong box with V cut through which fits over figure 4.
Figure 6. represents handle and flanged piece and screws which run through
figure 4 and which fit inside figure 5.
A in figure 1 represents the screw bottoms projecting through the top of oblong
box which fasten figure 6 to figure 5. B steel wires in position. C oblong casing
of box. D ordinary knife in position for sharpening. E flange. F ordinary
handle. 7 a V made in oblong box.
A in figure 2 represents section of oblong box. B india rubber which fits inside
of A and acts as a spring. C screws which fasten oblong box to the second part of
handle F and flange E and G. D and H two pieces of steel wire crossed the top
part fitting against the top of V in oblong box and the other end fitting in holes C
on figure 6, india rubber supporting same in position.
A and E in figure 3 represent top and bottom of screws which run through
oblong box. B front elevation of box. C shows steel wires in position. D and F
handle and flange.
A in figure 4 represents steel wires. B sectional view of india rubber with holes
running through C. D bottom part of steel wires projecting through to fit in C in
figure 6. B plan view of bottom of figure 4. C holes for screws. E holes
where D in figure 4 fits in.
A in figure 5 represents three quarter elevation of oblong box which fits on
figure 6.
B in figure 6 represents screws which fasten figure 5 on figure 6. D and E
second part of D fitting inside figure 5. C holes which receive Ď in figure 4.

page_text: 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
First. In the construction of a Duplex Sharpener or Steel for sharpening knives
and other instruments of similar description as herein described and fully set
forth.
Second. Four pieces of steel wire or their equivalent crossed such as A in figure 4
and fitted as D and H in figure 2 as herein described.
Third. In the construction of a piece of india rubber or its equivalent for the
purpose herein described such as B in figure 4 with holes C for screws and to act
as a spring supporter for steel wires D and H in figure 2 and to fit inside oblong
box such as A in figure 5.
Fourth. Handle and flange such as described in figure 6 with flange D and
screws B and holes for the purpose herein described.
Dated this 22nd day of Tul., 100
JOSEPH BENJAMIN ADAMS,
Agent for the said John F. Lashbrooke,