An Improved Knife Blade.
Year: 1893

page_text: Date of Application, 9th Aug., 1893-Accepted, 9th Sept., 1893
COMPLETE SPECIFICATION.
An Improved Knife Blade.
I, JOHN EDWARD EVANS-JACKSON of 45 Holborn Viaduct, London, Engineer
and Patent Agent, do hereby declare the nature of this invention (communicated
to me by Russ Jackson Christy, Robert H. Rice, and Leonidas H. Cress of
Fremont, Ohio, U.S.A.) and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
The object of my invention is to provide an improved knife blade which I effect
in the following manner :-
The drawings lodged herewith and the following description set forth in detail
one mechanical form embodying the invention; such detail construction being but
one of various mechanical forms in which the principle of the invention may
be used.
In the said drawings—
Figure I represents a side view of my improved knife blade showing the sinusoid
bevel a.
Figure II a view of the opposite side of the knife blade; showing the straight
bevel a¹.
The knife blade A. has its cutting edge formed to describe a waved line, a
succession of curves, a series of angles, or a partly curved and partly angled line,
although I prefer to form the edge, similar to the edge of the knife for which
Letters Patent No. 16817 were obtained by the said Russ Jackson Christy on the
3rd day of October, A.D. 1891.
In said knife the edge is formed to describe a waved or sinusoid line. The waved
cutting edge of the above mentioned knife, as well as of this my present knife, is
formed with a bevel, a, upon one side of the blade; said bevel describing a line
similar to the line of the edge, so that all teeth, and interdental spaces, are equally
sharpened.
The cutting edge of the knife is, however, thrown to one side of the central line
of the knife edge, by forming the bevel on one side of ti ife blade only; and,
for the purpose of avoiding the obliquity of cut, which is caused by unless
the person using the knife exercises special caution, I have found it de
also form a bevel upon the opposite side of the blade. It is almost actical
impossibility to form such bevel as following the waved edge line would form, since
too great care and exactitude of adjustment of the grinding apparatus would be
required for the purpose of bringing both bevels to register, to be practical or
economical, and I therefore form a straight bevel, a', upon the side of the blade
opposite the sinusoid bevel a.
By thus forming a bevel on both sides of the blade, I bring the cutting edge in
the central line of the blade, and the blade may be sharpened upon an ordinary flat
grindstone by grinding upon the straight bevel, exactly in the same manner as my
former knife blade is sharpened by being ground from the flat side.
Other modes of applying the principle of my invention may be employed for the
mode herein explained. Change may therefore be made as regards the mechanism
thus disclosed provided the principles of construction set forth respectively in the
following claims are employed.
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
A knife having a sinusoid or waved cutting edge, formed by a correspondingly

page_text: sinusoid or waved bevel on one side of the said edge, and by a straight bevel on
the opposite side of the said edge, substantially as set forth.
Dated this 5th day of August 1893.
J. E. EVANS-JACKSON & Co.,
Patent Agents,
45, Holborn Viaduct, London, Agents for the Applicant.