Bottoms for Artillery Purposes.
Year: 1885

page_text: Bottoms for Artillery Purposes.
I, JOHN BERNSTRÖM of N° 11 Storkyrko-Crinken, Stockholm, Sweden, Engineer
do hereby declare the nature of my invention for "SOLID DRAWN CARTRIDGE CASES
OF SHEET-METAL WITH STRENGTHENED BOTTOMS FOR ARTILLERY PURPOSES to be
as follows
33
The object of this invention is solid drawn cartridge cases for artillery purposes
of sheet metal, the bottom of which is strengthened by a disc of suitable shape and
material soldered, pressed and fastened in some other way to the inside or the
outside of the bottom.
These cartridge cases can be made of any calibre, and the bottoms whole, or
perforated, as required by the special kind of firing device to be used.
The strengthening discs may be either flat or provided with flanges or projections,
fitting to the cartridge case proper and to the chamber of the ordnance.
The cylindrical flanges on the discs may be provided with grooves or screw
threads, into which the lower part of the case is drawn or pressed.
When the inside disc is provided with a cylindrical flange, the thin edge thereof
is pressed outwards in firing the cartridge, and makes an air tight joint against the
walls of the case.

page_text: I JOHN BERNSTRÖM of N° 11 Storkyrke Crinken, Stockholm, Sweden, Engineer
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 invention is solid drawn Cartridge cases, for artillery purposes,
of sheet metal, the bottom of which is strengthened by a disc of suitable shape and
material soldered pressed or fastened in some other way to the inside or the outside
of the bottom.
These Cartridge cases can be made up of any Calibre, and the bottoms whole or
perforated as required by the special kind of firing device to be used.
The 'strengthening discs may be either flat or provided with Flanges or pro-
jections fitting to the cartridge case proper and to the chamber of the ordnance.
The Cylindrical flanges on the discs may be provided with grooves or screw
threads, into which the lower part of the case is drawn or pressed.
When the inside disc is provided with a Cylindrical Flange, the thin edge thereof
is pressed outwards in firing the cartridge, and makes an airtight joint against the
walls of the case.
"
The accompanying drawings show some different methods in which the strength-
ening disc may be applied to the pressed or drawn bottom of the cartridge case.
Fig. 1 shows in longitudinal section a cartridge case A" with the strengthening
dise B soldered or fastened in some other way to the outside of the bottom, which
is in this figure provided with a cavity for the percussion-cap and belonging parts
or other firing device Fig. 2. (the left side) is a plan thereof.
Fig. 3. left side, shows in Section the saine method of applying the disc B but
here the percussion cap and belonging parts are placed in an opening made in the
bottom. The right side of Fig. 2 shows a plan hereof The right side of Fig. 3
shows a form somewhat modified.
In figures 4 and 5 the strengthening disc is placed on the inside of the bottom.
In figure 6, the left side, the cartridge case is near the bottom pressed into a
groove in the flange B' projecting from the strengthening disc B. In the right
side of same figure the flange B₁ is on the inside provided with screw threads into
which the Cartridge case is pressed.
Fig. 7. shows in Section two different methods of applying inside the cartridge
case a strengthening disc with projecting cylindrical flanges the edge of which in
firing the cartridge is pressed outwards by the powder gas so as to make an
airtight joint against the inside walls of the case.
The shape of the strengthening disc and the method of jointing it to the bottom
of the cartridge case may however be varied in several more ways, than those
represented in the drawings without departing from the essential part of this
invention.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
A solid drawn Cartridge case of sheet metal the bottom of which is strengthened
by a disc of suitable shape and material soldered pressed or otherwise fastened to
the inside or outside of the bottom substantially as specified.