Means for Preventing the Escape of Gases at the Breech End of Breech Loading Bolt Guns.
Year: 1895

page_text: Date of Application, 13th Aug., :895-Accepted, 12th Oct., 1895
COMPLETE SPECIFICATION.
Means for Preventing the Escape of Gases at the Breech End of
Breech Loading Bolt Guns.
I, PAUL MAUSER, of Oberndorf on the Neckar, in the Kingdom of
Württemberg and 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 :-
The present invention relates to improvements in breech loading bolt guns so as
to prevent, in case of the cartridge becoming torn, the escape of gases and the
esulting damage to the arm and to the person using the same.
Notwithstanding the many improvements introduced into the manufacture of
cartridge cases it sometimes happens that some of the latter are not strong enough
for the high pressure of gases in modern arms and they burst during firing, the
consequence of which is that a large amount of the gases of explosion escapes
through the breech and forms not only a danger to the person using the arm but
also causes more or less damage to the weapon.
In order to obviate these faults or to reduce to a minimum these injurious
occurrences so far as to remove all danger to the weapon and to the person using
same I have adopted the arrangement represented in the accompanying
drawings, in which
the
Fig. 1 is a longitudinal section of some of the breech parts of a breech loading
bolt gun,
Fig. 2 is a cross section drawn on the line I. I of Fig. 1 and
Fig. 3 is a cross section drawn on the line II. Il of Fig. 1.
In carrying my invention into effect I have found it advantageous to cause the
ring-formed part a, in the interior of the breech end A immediately behind the
cartridge holder within which enters the breech bolt head B, to fit tightly around
the latter and to have only a recess b in which is located the claw of the empty
cartridge extractor which latter fits the said recess which, in case the cartridge case
becomes torn, prevents the gases from freely passing through the small open spaces
around these parts. Any small quantity of gases of explosion that may escape
passes out in the direction indicated by the arrows and can no longer produce the
dangerous effect of a rear flame; a further advantage of the present arrangement
consists firstly in enabling the left hand locking nipple c of the extractor to be left
full at its rear end instead of being cut through so that here also the former passage
for escape of gases is blocked; and secondly in not requiring the groove in the
lower bearing of the gun barrel for the passage of the right hand locking nipple
thereby not only enlarging the bearing surface of the locking nipple and bringing
it nearer the axis of the breech bolt, but at the same time blocking the passage
of the gases to the magazine of the rifle and thus securing the latter against
damage.
Having now particularly described and ascertained the nature of my said inveu-
tion and in what manner the same is to be performed I declare that what I
claim is :--
1. In breech loading bolt guns the arrangement for preventing the escape of
gases at the breech consisting of a ring formed part a in the breech end A, between
The cartrides holder and the area
the lacking ninala which

page_text: fits tightly around the breech bolt head B so as to prevent the escape of gases;
the ring formed part a having only a recess 6 toward the open end of the barrel
for the reception of the claw of the extractor, substantially as herein shown and
described.
2. In breech loading bolt guns the improved construction and arrangement of ♬
parts substantially as herein shown and described and for the purpose stated.
Dated August 13th 1895
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.
HARRIS & MILLS,
23 Southampton Buildings, London, W.C., Agents.