Year: 1887

page_text: We, ARMAND MIEG of Leipzig, Officer, and HUGO BISCHOFF of 5 Cornelius Street,
Berlin, Doctor of Natural Science both in the German Empire 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 an improved method of manufacturing so-called cased
projectiles particularly designed for small arins, and it refers especially to that class
of projectiles the cases of which are made of very strong sheet metal such as steel,
iron or other similar material. It would be inconvenient to provide such projectiles
with a very strong case of hard metal as thereby the grooves of the small arms would
rapidly be damaged and worn out.
In order to provide on one hand the cased projectile with a sufficient guidance in
the grooves and to avoid on the other hand that the grooves may be worn out
too rapidly it is advantageous to surround the hard cases of the projectiles with
a guiding surface of soft metal such as copper, brass, and the like. This invention
consists in the construction of the cased projectile itself with a soft metal guiding
surface forced or pressed into it and in the method of applying this soft metal
guiding surface, which is formed with a suitable configuration. For this purpose we
proceed in the following manner.
Upon the finished cased projectile shewn at Fig. 1 of the accompanying drawings
which is provided with a case made of very strong material and charged with lead,
wolf ram or other suitable material b, we push a suitably large and thick tubular
piece c made of soft metal such as copper brass and the like (Fig. 2). In lieu of only
one tubular piece, two, three or more may be pushed upon the projectile (see Figs. 3
and 4) each of which in this case is treated in the manner hereinafter described.
In all the figures of the accompanying drawing a is the shell or case of the
projectile, is the core and c the soft metal guiding surface. The closely fitting
tubular pieces are pushed upon the case projectile and after they have been brought
by hand or by means of any special mechanical device to the place which they will
occupy in the finished projectile, the whole is placed under a press and the cased
projectile provided with the tubular pieces (Fig. 2 to 4) is now exposed to a

page_text: sufficiently high pressure during a time long enough for pressing the case made of a
very strong material so as to bring the outer surface of the soft material flush or
nearly so with the surface of the case, by this operation the projectile will be some-
what deformed and stretched. When withdrawn from the press the case projectile
has the form shewn in the figures 5-10 of the accompanying drawing. Fig: 5
shews the soft metal guiding ring not completely forced in. As shewn in these
figures the side cheeks of the press may have such a form that by applying the
pressure not only the soft metal guiding ring may be forced into the case of the
projectile but that at the same it is provided with one or more guiding fillets.
The figures 6 to 10), by way of example, shew only one guiding fillet, on each guiding
.ring.
According to the profile given to the side cheeks of the press the guiding
fillets may have a semi cylindrical cross section as illustrated in the figures 68
or a conical cross section or any other suitable shape. In addition to the advantage
that by this arrangement the grooves of the barrel are not injured at all, the above
described operation of applying the soft metal guiding rings offers the particular
advantage that a very solid and reliable connection between the case of the projectile
with its core, attained by choking the former into the latter by means of the soft
metal guiding rings, the core is prevented from bursting the shell when the projectile
,strikes against a solid and hard target. When in manufacturing the projectile it is
found that by the herein before described operation an intermediate space has been
formed as shewn in figure 11, it is only necessary to exert further pressure against
the bottom of the projectile to close this space. The finished cased projectile provided
with the soft metal guiding ring or rings may have for instance the form shewn in the
figures 12-17 of the accompanying drawings. The projectiles made in accordance
with our invention allow of a much longer use of the small arms than the projectiles
provided with metal cases, and our projectiles have furthermore the most valuable
advantage that an excellent connection between the core of the projectile and the
surrounding casing is attained.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we declare that what we claim is :-
1. A method of manufacturing cased projectiles having an external case of very strong
material and one or more soft metal guiding rings forced therein, such method con-
sisting in pushing well fitting tubular pieces upon the case of the projectile and foreing
or pressing the same by means of suitably profiled side checks of a press into the case
of the projectile, whereby a solid and reliable connection between the core of the
projectile and the case and also between the case and the soft metal guiding ring or
rings is attained substantially as herein described and shown in the drawing.
2. In manufacturing projectiles as set forth in the preceding claim the application
of a supplemental pressure upon the bottom of the case projectile when, after the first
pressure, intermediate spaces have been formed between the soft metal guiding ring
or rings and the case of the projectile as represented in Fig. 11, by which operation
a close connection between the case and the soft metal guiding ring will be attained.
3. A cased projectile for small arms having a soft metal guiding ring pressed or
forced into it, the exterior surface of which guiding ring may be smooth as shewn in
the figure 5 or provided with projections such as illnstrated in the figures 6-10
and 13-17 or of any other suitable shape.
ABEL & IMRAY,
Agents for the Applicants.