IMPROVEMENTS IN THE CONSTRUCTION OF KNIVES OR CUTTERS
Year: 1855

page_text: LETTERS PATENT to Jean Daniel Pfeiffer, of 1, Rue Princesse, Paris,
for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF KNIVES OR
CUTTERS."
Sealed the 18th March 1856, and dated the 5th October 1855.
PROVISIONAL SPECIFICATION left by the said Jean Daniel Pfeiffer
at the Office of the Commissioners of Patents, with his Petition, on the
5th October 1855.
I, JEAN DANIEL PFEIFFER, of 1, Rue Princesse, Paris, do hereby declare
the nature of the Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF KNIVES
OR CUTTERS" to be as follows:-
This Invention is applicable to the construction of the knives of paper-
cutting machines and of other cutting blades. It consists in forming the body
of the knife of two pieces of iron, which are kept together by screws, and hold
between them a plate of steel, which forms the cutting edge of the knife. This
plate of steel is set up by screws pressing on its back edge, so as to project it
a short distance beyond the pieces of iron forming the body of the knife, and
as it wears away by use and sharpening, it is protruded further and further
forward by the set screws. The plate of steel is so set between the pieces of
iron that the bevilled edge of the plate is on a straight line with the forward
surface of the holder.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Jean Daniel Pfeiffer in the Great Seal Patent Office on the
31st March 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JEAN
DANIEL PFEIFFER, of 1, Rue Princesse, Paris, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifth day of October, in the year of our Lord
One thousand eight hundred and fifty-five, in the nineteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Jean Daniel Pfeiffer, Her special licence that 1, the said Jean
Daniel Pfeiffer, my executors, administrators, and assigns, or such others as
I, the said Jean Daniel Pfeiffer, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at
all times thereafter during the term therein expressed, should and law-
fully might make, use, exercise, and vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF KNIVES OR CUTTErs,”
upon the condition (amongst others) that 1, the said Jean Daniel Pfeiffer,
my executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Jean Daniel Pfeiffer, do hereby
declare the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
This Invention is applicable to the construction of the knives of paper-
cutting machines and of other cutting blades. It consists in forming the body
of the knife of two pieces of iron, which are kept together by screws, and hold
between them a plate of steel, which forms the cutting edge of the knife. This
plate of steel is set up by screws pressing on its back edge, so as to project it a
short distance beyond the pieces of iron forming the body of the knife, and as
it wears away by use and sharpening, it is protruded further and further
forward by the set screws. The plate of steel is so set between the pieces of
iron that the bevilled edge of the plate is on a straight line with the forward
surface of the holder.

page_text: And in order that my said Invention may be most fully understood and
readily carried into effect, I will proceed to describe the Drawing hereunto
annexed.
DESCRIPTION OF THE DRAWING.
Figure 1 shows a transverse section, and Figure 2 is a side view, of a knife
arranged according to my Invention, and suitable for a paper-cutting machine.
A and B are two pieces of iron, which are kept together by screws a, a¹, and
which hold between them a plate of steel C, which forms the cutting edge of
the knife; D, D', D", are the set screws, which press on the back edge of this
plate, and project it a short distance beyond the pieces of iron A and B.
In witness whereof, I, the said Jean Daniel Pfeiffer, have hereunto set
my hand and seal, this Twentieth day of March, in the year of our
Lord One thousand eight hundred and fifty-six.
5 Witness,
T. BASSET,
of Paris, 2, Rue Drouot.
J. D. PFEIFFER. (L.S.)