Aug. 22, 1944.	н. schmeisser	2,356,538
. BLANK AMMUNITION FIRING ATTACHMENT FOR AUTOMATIC GUNS
Filed Oct. 14, 1940

Jnventer:
^ck-mausef
>4 ttor-rre.yj
Patented Aug. 22, 1944
2,356,538
UNITED STATES PATENT OFFICE
2,356,538
BLANK AMMUNITION FIRING ATTACHMENT
FOB AUTOMATIC GUNS
Hugo Schmeisser, Suhl, Germany; vested in the
Alien Property Custodian
Application October 14,1940, Serial No. 361,184
In Germany November 22, 1939
2 Claims.
The invention relates to automatic guns and
particularly to a device for controlling the gas
pressure in automatic blank cartridge firing
with such automatic guns.
It is an object of the present invention to pro-
vide a device or an arrangement of this kind
which is simple in construction and able to offer
resistance in use and which may be easily
manipulated especially for cleaning purposes.
The invention consists therein that the gas
throttling is effected by means of a loosely fitting
core-bar or stem adapted to be inserted into the
barrel of the gun and having a smaller diameter
than the bore of the said barrel.
It is a further object of the invention to pro-
vide a loosely Atting core-bar or stem which ex-
tends substantially over the entire length of the
barrel of the gun.
A further object of the invention is to provide
a Atting core-bar or stem which is rigidly con-
nected with a silencer-funnel in such a manner
that both parts form a practical unit for use.
The means for securing the said unit to the au-
tomatic gun as for instance a screw thread are
arranged preferably on the said silencer-funnel.
In the preferred form of the present invention
the Atting core-bar or stem and the silencer-fun-
nel are rigidly connected by riveting a reduced
end of the core-bar to a portion of the silencer-
funnel.
To these ends my invention consists in the
novel construction and arrangement of parts to
attain the ends above speciAed and in the de-
tails of construction and mechanism for other
purposes, as will hereinafter more fully appear
and which are deffned in the claims at the end
of this speciffcation.
My invention in its preferred form or approx-
imately such form is illustrated in the accom-
panying drawing, in which
Fig. 1 is a central longitudinal section of a
portion of an automatic gun constructed in ac-
cordance with the present invention, only so
much of the barrel being shown as is necessary
for the purpose of explanation, and
Fig. 2 is a sectional view through the silencer,
taken on the line 2—2 of Fig. 1.
In the drawing ( designates the front part
of the barrel of an automatic gun and 2 a
loosely Atting core-bar or stem inserted into the
bore of the barrel and having a little smaller
diameter than the bore of the barrel. On the
muzzle of the gun is Axed by means of screw
thread 3b a silencer or casing funnel 3 provided
with the gas channels 3a offset laterally from
(Cl. 42—1)
the bore of the barrel and secured to the
front end of the Atting core-bar 2 so that both
parts, viz., the Atting core-bar 2 and the silencer-
funnel 3 form a unit. In the example shown
6 the front end 2a of the Atting core-bar or stem
projecting from the muzzle of the gun is reduced
or stepped and riveted to the central portion
of the silencer-funnel as indicated at 2b. In-
stead of the use of a screw thread other suitable
Ю means may be used for connecting the silencer-
funnel with the muzzle of the barrel.
If in operation an automatic gun arranged
for loaded or bulleted cartridge Aring is to revert
into an automatic gun arranged for blank car-
15 tridge Aring, i. e., with the usual and known
cartridges without bullets, it is only necessary
to insert the Atting core-bar 2 provided with
the silencer-funnel 3 into the barrel of the auto-
matic gun and to screw up the silencer funnel
20 3 with its screw thread upon the screw thread
on the front end of the barrel.
It is obvious that the device according to the
present invention is simple in its construction
and cheap to manufacture and permits an easy
25 and quick changing of an automatic gun from
one kind of Aring to another one.
A further advantage of the device according
to the present invention consists in its high
capacity of resistance and in the convenient pos-
30 sibility for cleaning.
It will be understood that I do not limit my-
self to the details of construction above set forth,
but, on the contrary, that many mcdiAcations
may be made within the broad scope of my
36 invention.
What I claim and desire to secure by Letters
Patent of the United States is as follows:
1. In an automatic gun a barrel, a silencer
casing having openings at both ends in line
40 with said barrel, removably secured to the muz-
zle of the barrel, said casing having a central
portion extending across the same intermediate
its ends, and a core rod secured to said central
portion, extending into the bore of the barrel
45 and spaced from the wall of the bore, and said
central portion being formed with a plurality of
openings eccentric to the barrel axis, each of
said last named openings forming a communi-
cation between said Arst named openings.
50	2. The gun as claimed in claim 1 wherein
the rod extends substantially the length of the
barrel and the eccentric openings are spaced lat-
erally from the space in the barrel between the
rod and the wall of the bore.
55	HUGO SCHMEISSER.