Improvements in Knives for Opening Tins or Receptacles.
Year: 1894

page_text: Date of Application, 6th July, 1894
Complete Specification Left, 8th Apr., 1805-Accepted, 6th July, 1895
PROVISIONAL SPECIFICATION.
Improvements in Knives for Opening Tins or Receptacles.
I CARLO ANGELO DAINESI of Milan in the Kingdom of Italy, Artisan at
present residing at No. 35 and 37, Warner Street Clerkenwell in the County of
Middlesex do hereby declare the nature of this invention to be as follows:-
1. The blade and body of the tin opener is all made entirely of one piece which
combines handle, or other handles can be substituted; when the first operation is
made I bend the blade of the knife more or less perpendicular to the plate forming
the arm lever, the clearance between the surface of the lever and the cutting edge
of the blade is about of an inch or according to the size of knife wanted.
2. In making tin opener of subtle or fine sheet metal I give to them additional
strength by either bending up or down on the opposite side of the blade, forming
more or less round or square angle or angles by bending strengthens the leverage
doubly, and then in all or partial lengths of the body of tool.
3. In every kind of the tin openers at the extremity of the front end I bend, or
I produce with any other way thereby forming a lip, so when the point of tool is
working the point clears the edge or surface of receptacles, which it serves doubly
as a guide and force to the knife when tool is working, and prevent also to slip.
I form leverage part by bending fore part and forming knife slightly to side, and
the fulcrum of lever is shaped and also acts as guide.
4. In doing sheet metalic tin openers I give to them the necessary strength in
the body by stamping the body in the form of V, T, U or by stamping one or
more ribs to come in the same width or different sizes accordingly to give all
strength.
5. At the blade of every kind of tin openers I do the blade, "curved" instead of
being straigth thereby producing a clear and proper cut without jagging anything
it opens.
Dated this 5th day of July 1894.
COMPLETE SPECIFICATION.
Improvements in Knives for Opening Tins or Receptacles.
I CARLO ANGELO DAINESI of Milan in the Kingdom of Italy, Artisan at
present residing at 15, Back Hill, Holborn, in the County of Middlesex, and
formerly of 35 and 37 Warner Street Clerkenwell, in the said county, 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 :-
The object of this my invention is :-
I. Produce cheap and efficient knives for opening tins or receptacles, of sheet
metal, steel, iron or other suitable metals, in one piece; instead of to be made from
massive piece, or having the blade fixed on by setting screw or screws, or rivetted
to the body of the said tool.

page_text: thin or fine sheet metal, by giving to them a bent angle or angles in all or partial'
length of the body of the tool.
III. Making in knives for opening tins or receptacles at the extremity of the
front end (fulcrum of lever) a lip which is shaped and also acts as a guide, and
prevent it from slipping.
IV. Obtaining in knives for opening tins or receptacles of sheet metal the
necessary strength by stamping a rib or ribs to come in the same width, or different
size accordingly to give all strength.
V. Making in knives for opening tins or receptacles, the blade "curved"
instead of straigth 'to thereby produce a clear and better cut, especially in opening
tins or receptacles with the bottom or cover of round shape.
MODE OF PERFORMING THE INVENTION.
Fig. 1. The blade and body of the knives for opening tins or receptacles, is made
of one single piece a which combines handle or handles can be attached. I bend
the blade of the knive more or less perpendicular to the plate forming the arm-
lever b. of Fig! 1, the clearance between the surface of the lever and the catting
edge of the blade is about of an inch or according to the size of knive wanted;
the knife is made by dies in the well known manner for cutting or stamping sheet
metal articles.
Fig. 2. In making knives for opening tins or receptacles, of thin or fine sheet
metal. I give to them additional strength by either bending up or down along
part of, or the whole length of the handle of tool on the opposite side to the blade,
forming more or less round or square angle or angles c, and d. Fig. 2. which
strengthens the lever; this is done by well known dies for stamping sheet metal
articles.
Fig. 3. In every kind of knives for opening tins or receptacles, at the extremity
of the front end I bend or I produce with any other way a "lip," e and f. of Fig. 3.
so when the point of tool is working the handle or tool clears the edge or surface
of the receptacle, the lip serves as a guide & falcrum 'to the knive when working,
and prevents also slipping. I form part of lever by bending fore part and forming
the knives to side slightly and the fulcrum of lever is shaped as at g & h and also
acts as guide. Those operations are made with dies for cutting and stamping sheet-
metal articles.
For making "lip-guide" (fulcrum) g. and h. of Fig. 3. for the purposes described
to the knives for opening tins or receptacles not of sheet metal in one piece, I do
said lip-guide at the forge and afterward finish by filing, or I make the knives by
casting.
Fig. 4. In making sheet metal knives for opening tins or receptacles I give to
them the necessary strength in the body by stamping the said body in the form
of V or Tor U. or by stamping one or more ribs to come in the same width or
different sizes accordingly to give all strength, i, l, m, of Fig. 4. I do these
operations by means of the well known dies for stamping in the ordinary way by
a press.
Fig. 5. The blade of every kind of knives for opening tins or receptacles, I make
"curved n. of Fig. 5. instead of straight, thereby producing a clear and better
cut without jagging anything it opens.
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 :-
Firstly. The use of knives for opening tins or receptacles; the same made in
one single piece from sheet metal, in the manuer, and for the purposes herein before
described in Fig. 1.
Secondly. The use of knives for opening tins or receptacles, of sheet-metal

page_text: being bent up or down on the oposite side of the blade for the purposes of giving
additional strenght to the body of the tool, in the manner and for the purposes
hereinbefore described in Fig. 2.
Thirdly. Forming every kind of knives for opening tins or receptacles, with a
fulcrum or lip, to act as a guide, (9 or h of Fig. 3.) as hereinbefore described.
Fourthly. In knives for opening tins or receptacles, stamping on the body oue
or more ribs, in the manner and for the purposes herein before described in Fig. 4.
Fifthly. The use in kives for opening tins or receptacles of a
" curved "blade
instead of a straight one in the manner and for the purposes hereinbefore described
in Fig. 5.
Dated this 6th day of April 1895