Improvements in Cartridge Cases.
Year: 1894

page_text: Date of Application, 2nd June, 1894-Accepted, 14th July, 1894
COMPLETE SPECIFICATION.
Improvements in Cartridge Cases.
I, AXEL THEODOR HOLGERSON, Engineer, of Nygard near Borgholm, in the
Kingdom of Sweden, 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 :-
It has been found that cartridges made of paper are rather weak and at the
firing partly burst close to the bottom of the cartridge which is surrounded with a
metallic case or cap whereby powder gas escapes and is lost. Apparently this
inconvenience arises partly from the different expansion of the paper tube and the
metallic case when firing and partly from the fracture of the paper tube when the
metallic case is pinched on the same. Furthermore the said case is comparatively
expensive.
The present invention has for its object to remove this inconvenience by manu-
facturing cartridge cases so far as possible of one single material, for instance
paper, by which an almost uniforin expansion is obtained in addition to a reduced
cost of material.
The accompanying drawing shows in longitudinal-sections the different stages of
the manufacture of a cartridge case in accordance with my invention.
Figure 1 represents the first stage, a tube A, made, in any convenient way, of
paper or similar material. From Figure 2 it is further seen that one end of A is
shaped to form a central smaller tube a extending inwards into the tube A. Into
the annular space thus formed between A and a is now placed a filling which
conveniently consists of a hollow cylinder B, Figure 3, made of a paper strip,
paper pulp or such like, and in Figure 4 is shown how this is placed between a
and A and how the free end of the smaller tube a is turned or flanged outwards
over the filling. This turning outwards of the tube a is however not indispensable,
and said tube a may be of the same length or shorter than the filling B, but owing
to certain advantages the arrangement shown in Figure 4 is preferable. Neither
is it necessary, for obtaining the above filling in the tube to introduce a special
body. For example, provided the tube a is made sufficiently long the desired
filling may be effected by plaiting, folding or doubling the said tube successively
b in Figure 5
in opposite directions or simply by pressing the same down.
represents such a filling.
The filling having thus in one way or other been placed around the tube a,
Figures 4 and 5, the tube A is introduced in a press-mould made for the purpose.
and then subjected to strong pressure with the aid of a plunger or mandrel,
introduced from the mouth of the tube, this pressure being directed upon the filling
and the tube. In this way the bottom or end of the cartridge is formed to the
required shape and of the necessary strength. Figure 6 represents such a presse l
As will be
cartridge constructed as before described and illustrated in Figure 4.
seen this is a cartridge with so-called central firing provided with a seat c for the
percussion cap and a rim d. Cartridge cases for other than central firing may be
produced according to this invention by employing a mandrel and mould of suitably
modified forms.
In order to further strengthen the bottom of the cartridge or parts thereof the
material, before or after the pressure may be treated with a solution of animal glue
or shellac or in any and other desired way.
As an extra reinforcement of the rim d Figure 6 it may as shown in Figure 7 on
an enlarged scale, be surrounded by a cape of sheet metal or other hard material.
The cartridge cases made in the before-described manner may if desired be

page_text: provided with interior or exterior metallic coverings such as those employed in
cartridge cases hitherto used.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed; I declare that what I
claim is ;-
1. A cartridge case comprising a tube made of paper or other suitable material
one end of which is formed into a central smaller tube such as a extending inwards
into and made in the same piece with the larger tube the smaller tube a forming
the end or bottom or part of the end or bottom of the cartridge case being pressed
together with a filling such as B of suitable material introduced between the
smaller and larger tubes substantially as described and illustrated in the accom-
panying drawings.
2. In a cartridge case such as indicated in the preceding claim the substitution
for the independent filling B between the tubes a and A of successive plaits folds
or layers of the smaller tube a substantially as described and illustrated in the
accompanying drawings.
3. The combination with a cartridge case such as indicated in the first and
second claims of a cap such as e of metal or other suitable material substantially
- as described and illustrated in the accompanying drawings.
Dated this and dox of Tu1001
W. P. THOMPSON & BOULT,
Agents for the Applicant.
W. P. THOMPSON & BOULT,
Agents for the Applicant.