Improvements in Cartridge Cases.
Year: 1890

page_text: Improvements in Cartridge Cases.
I, EMIL MÜLLER of Hohenzollernring No. 19, Cologne, in the Empire of Germany,
Manufacturer, 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 :-
This invention relates to cartridge cases and has for its purpose to effect economy in
manufacture and obviate tearing of the cases.
The metal cartridge cases which are now also employed for smokeless powder have
a rearwardly widened shape and a narrowed space for the shot. These cases have
been hitherto produced by drawing in ("calibrating") the metal tube. This manipu-
lation very frequently occasions folds and rents which, on the one hand, increase the
cost of manufacture owing to the larger quantity of faulty or inapplicable cases, on
the other hand lead to cracking, by cases with invisible rents getting amongst those
ascertained as fit for use.
To obviate the above drawbacks, that is to say to facilitate manufacture and avoid
the said cause of cracking, I make these conic cartridge cases by giving the rear
portion (powder chamber) of a cylindric cartridge case produced in the known manner
and having the width of the shot space, such an external shape as to cause it to com-
pletely fill out the cartridge chamber, by pressing or drawing over of a stiffening ring.
With this method of producing the cartridge case out of an inner smooth cylindric
tube with jacket ring also the important advantage is gained that the explosion
vapours do not meet a resistant surface in the longitudinal direction as is formed in
the method, hitherto applied, of producing the cases owing to the transition from the
powder to the shot chamber, which resistance frequently causes tearing and stretching
of the cartridge case.
Referring to the accompanying drawing showing longitudinal sections of various
cartridge cases made after the improved method
Figs. 1 and 2 represent cases the bottom and cylinder of which are made separately
and connected by bendings.
Fig. 3 shows a case drawn from thin sheet metal with its rim worked out.
Fig. 4 is a case with a solid flange as rim.
Fig. 5 illustrates a case made like that shown by Fig. 4 except that the rim
projects over the conic portion, which extends as far as the flange, in order to afford
hold for the extractor, such hold being provided in cases shown by Figs. 1 to 4 and 7
by means of free spaces or grooves left between the conic portion and the rim of the
cartridge case.
Fig. 6 illustrates the inner cylindric without the conic jacket shown in Fig. 5.
Fig. 7 represents a cartridge case in which the inner tube is pressed from one
piece.
As shown in the drawings all modifications of the improved cartridge case have the
peculiarity of consisting of a smooth cylindric inner metal mantle or tube a, in which
the bottom c with priming cap is secured either by bending round or by pressing or
in any other suitable or known manner; a ring-shaped conical body 6 of metal, paper
pulp or vegetable fibre is shifted over the said thin-sided metal tube and connected
with the cylindric inner tube by pressure, cementing or glueing; or the conic part is
produced by rolling paper or cloth saturated with glue or other agglutinant round the
cylindric tube.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
A contriddere
with all
chamban

page_text: consisting of an internally smooth cylindric metal tube which is given the shape of a
drawn-in metal tube by placing a ring shaped cone in the described manner on the
powder chamber for the purpose of dispensing with the work of drawing-in and of
obviating the cracking of cartridge cases occasioned thereby, substantially as set
forth.
T
ALL of Candamba 1900
EMIL MÜLLER.
By Huelser & Co.,
Temple Chambers, London, his Attorneys.