IMPROVEMENTS IN THE MANUFACTURE OF METALLIC CARTRIDGE CASES
Year: 1874

page_text: LETTERS PATENT to Edward Jones, of Birmingham, in the County of
Warwick, Engineer, for the Invention of " IMPROVEMENTS IN THE
MANUFACTURE OF METALLIC CARTRIDGE CASES."
Sealed the 10th November 1874, and dated the 12th September 1874.
PROVISIONAL SPECIFICATION left by the said Edward Jones at the
Office of the Commissioners of Patents, with his Petition, on the
12th-September 1874.
-
I,. EDWARD JONES, of Birmingham, in the County of Warwick,
Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE MANUFACTURE OF METALLIC CARTRIDGE CASES," to be as
follows:-
In drawing down the cases of metallic cartridges from solid circular
blanks of metal very considerable force is required, and unless great care
is taken there is a liability of the cartridge case being made thinner on

page_text: one side than on the other, and consequently it will be weaker on that
side, and therefore liable to burst when the charge is exploded. To
prevent these accidents, and to provide for the desired strength, an
excess of metal is required and is usually employed. This extra
quantity of metal enhances the cost of the cartridge case, and (during
its manufacture) considerably increases the strain upon the punching
tools employed for drawing down the case from the circular metal
blank.
The object of the present Invention is to manufacture metallic
cartridges in such a manner that the internal and external surfaces of
the several parts shall be concentric throughout, or in other words that
one side of the cartridge shall not be thicker or thinner than the opposite
side, or what is usually termed lopsided, or with one side heavier than
the other.
In carrying out my Invention I prepare circular blanks of the required
size and thickness, but instead of forming a cup with cylindrical sides
(as the first operation of drawing down), as is usually the case, and for
which cylindrical punches are employed, I use a punch of a conical
form, and if desired provided with a shoulder. When this conical punch
is brought down on to the blank in the die it will bring the metal blank
or disc into the form of a conical cup, the internal and external surfaces
of the sides of which are concentric. In other words the conical cup
will not be lopsided or thicker and heavier on one side than the other of
the bottom or base, as if frequently the case with the cylindrical or
closed end cups. The bottom of the die is closed by a second punch,
the end of which is rounded or made of any other form which may be
necessary to produce any particular form of cartridge case. When the
conical punch has forced the blank into the die, and has thereby formed
the cup, it retires, and the other punch advances and pushes the newly
formed conical cup out of the die. The conical cup thus made is after-
wards drawn down in the ordinary way of making metallic cartridge
cases, and the cartridge case thus produced will be of more uniform
strength and lighter, and consequently less costly than those made in
the ordinary manner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward Jones in the Great Seal Patent Office
on the 11th March 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
JONES, of Birmingham, in the County of Warwick, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of September, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Edward Jones, Her special licence
that I, the said Edward Jones, my executors, administrators, and
assigns, or such others as I, the said Edward Jones, 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 lawfully 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 MANUFACTURE OF METALLIC CARTRIDGE CASES," upon the condition
(amongst others) that I, the said Edward Jones, 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 performed, 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 Edward Jones, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement, reference being had to the Drawing hereunto
annexed and to the letters and figures marked thereon (that is to
say) :—
In drawing down the cases of metallic cartridges from solid circular
blanks of metal very considerable force is required, and unless great
care is taken there is a liability of the cartridge case being thinner on
one side than on the other, and consequently it will be weaker on that

page_text: side, and therefore liable to burst when the charge is exploded. To
prevent these accidents, and to provide for the desired strength, an
excess of metal is required, and is usually employed. This extra
quantity of metal enhances the cost of the cartridge case, and during
its manufacture considerably increases the strain upon the punching
tools employed for drawing down the case from the circular metal
blank.
The object of this Invention is to manufacture metallic cartridges in
such a manner that the internal and external surfaces of the several
parts shall be concentric throughout, or in other words that one side of
the cartridge shall not be thicker or thinner than the opposite side, or
be what is usually termed lopsided, or with one side heavier than the
other.
In carrying out my Invention I prepare circular blanks of the
required size and thickness, as shewn at Figures 1 and 2 in the Drawing,
but instead of forming a cup with cylindrical sides (as the first operation
of drawing down) as is usual, I employ a conical punch a made with or
without a shoulder, as shewn at Figures 3 and 4, which are sectional
views of the die with the punch in different positions. When this
conical punch a is brought down on to the blank b in the die it will
bring the metal blank or disc into the form of a conical cup, as shewn in
section at Fig. 5, in which it will be seen that the external and internal
surfaces of the sides are concentric. In other words the conical cup will
not be lopsided, or thicker and heavier on one side than the other, as is
frequently the case with the cylindrical cups. The bottom of the die O
is closed by a second punch d, the outer end of which is rounded or
made of any other form which may be necessary to produce any par-
ticular form of cartridge case. When the conical punch a has forced
the blank 6 into the die, as shewn at Fig. 4, and has thereby formed the
cup, it retires, and the other punch advances and pushes the newly
formed conical cup out of the die, as shewn at Fig. 5. The conical cup
thus made is afterwards drawn down in the ordinary way of making
metallic cartridge cases, and the cartridge case thus produced will be of
more uniform thickness and strength throughout, and consequently
lighter and less costly than those made in the ordinary manner.
Having now described my Invention of "Improvements in the Manu-
facture of Metallic Cartridge Cases," and having explained the manner

page_text: of carrying the same into effect, I claim as the Invention secured to me
by Letters Patent as aforesaid, bringing the metal blanks (from which
the cases of metallic cartridges are produced) into the form of a conical
cup previous to drawing the same down into the form of a thin case, as
and for the purpose herein set forth.
In witness whereof, I, the said Edward Jones, have hereunto set my
hand and seal, the Eighth day of March, in the year of our Lord
One thousand eight hundred and seventy-five.