An Improvement in Forming the Cutting Edge of Knives, Cutting Tools and Cutting Instruments.
Year: 1899

page_text: Date of Application, 7th June, 1899-Accepted, 2nd Sept., 1899
COMPLETE SPECIFICATION.
An Improvement in Forming the Cutting Edge of Knives, Cutting
Tools and Cutting Instruments.
I, WILLIAM THOMPSON, of Ivy Cottage, Stratford upon Avon, in the County of
Warwick, Architect and Surveyor, 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 an improvement in forming the cutting edge
of knives, cutting tools and cutting instruments. The sharp cutting edge of
knives, cutting tools and cutting instruments are much more efficient for most
purposes when formed with a serrated edge, in order to simplify the method of
converting a sharp cutting edge into a serrated, cutting edge I use a short tube
of steel or other suitable metal I cut the tube lengthwise file-like and finish the
same similar to a file, the cut tube is secured by screws to a core of wood or
metal turned to fit the tube having a spindle to mount the same in a convenient
manner for use.
In order that my invention may be more readily understood and carried into
effect I append hereunto a sheet of drawings upon which I have illustrated my
invention.
Figure 1, is a view of my invention for converting the sharp cutting edge
of a knife into a serrated cutting edge. A, is a tube cut lengthwise file-like
and finished similar to a file. a, is a screw for securing the tube to core.
B, core of wood or metal. C, spindle. D, metal bracket secured by screws or
otherwise to a wood or metal block. E, wood or metal block. d, screw.
Figure 2, shows a tube cut lengthwise file-like mounted between two handles.
A, is the cut tube. a, screw for securing tube to core. B, core. C, C, spindle.
E, E, handles.
Figure 3, shows another method of mounting the tube. A, is the tube.
a, screw for securing tube to core. B, core. C, spindle. D, bracket secured to
handle. E, handle.
I do not limit myself to the method of mounting the tube as shown and
described by the drawing, in some cases, it is obvious that the device should be
mounted to suit the shape or form of the tool or instrument to which it is desired
to give a serrated cutting edge.
In using the device as shown by Figure 1, supposing it to be a carving knife
to which it is desired to give a serrated cutting edge, the knife having previously
been sharpened in the usual and customary manner, I hold the knife as shown
by the drawing in one hand and place the cutting edge on the tube cut file-like
at a point of the blade about farthest from the handle and with a pressure on
the tube push forward the knife which causes the tube to revolve and give a
serrated cutting edge to the knife.
The device mounted as shown by Figure 2, is supposed to be held in both hands
and the cutting tool or instrument to be of large size and secured in a vice or
otherwise, to give to the same a serrated cutting edge the tube cut file-like is
pushed forward or drawn with pressure on the cutting edge of the tool or
instrument.

page_text: The device as shown by Figure 3, is supposed to be held in one hand and a
cutting tool or instrument to which it is desired to give a serrated cutting edge
being held in the other hand the tube cut file-like is placed on the cutting edge
of the tool or instrument and pushed forward or drawn with pressure the length
of the cutting edge desired to be serrated.
It must be understood that a knife, cutting tool or instrument must have a
sharp edge given to it previous to using the device for converting it into a
serrated cutting edge.
It will of course be obvious that I can make the tube, of any size and that the
file cut-shape or form may be varied so long as it achieves the object in view.
Having now particularly described and ascertained the nature of my invention
and in what manner the same is to be performed, I declare that what I
claim is:-
An improvement in forming the cutting edge of knives, cutting tools and cut-
ting instruments consisting of a tube cut lengthwise file-like and finished similar
to a file secured to a core having a spindle substantially as and for the purposes
herein set forth and described.
Dated this 6th day of June 1890