Arrangement for Deadening the Report and Diminishing the Recoil at the Discharge of Firearms.
Year: 1899

page_text: Date of Application, 28th Mar., 1899-Accepted, 11th Nov., 1899
COMIDELE DIUIFICATION.
Arrangement for Deadening the Report and Diminishing the Recoil
at the Discharge of Firearms.
We, JACOB BÖRRESEN, of 90, Oscarsgade, Christiania, Norway, Admiral in the
Royal Norwegian Navy, and SIGUrd Sigbjörnsen, of Rödfos Cartridge Factory,
near Gjövik, Norway, Factory Manager, 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 is well known that attempts have been made to avoid or deaden the report
and to diminish the recoil at the discharge of fire arms by providing the barrel
with a suitably arranged automatic valve which when the projectile has passed
the spot near the muzzle of the barrel where it is placed closes the barrel, thus
forcing the gases of explosion to escape through specially arranged holes which
lead out of the barrel behind the valve in a rearward or lateral direction.
The present inventors have by experiments proved the possibility of almost
entirely avoiding the report without such a valve, which at the best is an incon-
venience. This may be done by means of a perforated sleeve shaped prolongation
of the barrel, said sleevo having a larger diameter than the barrel and fitted with
one or more deflectors or partitions having a central hole through which the
projectile can pass without hindrance. This sleeve may be in the form of a loose
sheet iron tube fitted upon the end of the barrel. It acts in this way that the
current of the powder gases which have a tendency after leaving the muzzle of the
barrel to adopt the shape of a cone or to expand laterally will be caught by the
said deflectors and distributed and made to escape through the perforated sides of
the sleeve. This natural tendency to escape laterally will to some extent be
increased by the projectile forming, when passing through the central openings,
plugs in them, thus momentarily closing the sleeve in a forward direction.
These report deadeners and recoil diminishers may be constructed in different
ways. But there must in any case be provided hindrances or deflectors which
catch that portion of the powder gases that lies outside of the path of the projectile,
and conduct the same to the side or if desired rearwards, sufficiently divided to
cause the pressure against the surrounding atmosphere to be equalized and dis-
tributed over a larger area. In this way the concussion or report will not only
be less violent but as its transmission cone becomes so much larger the sound
waves that travel in the same direction as the projectile become so much less
intense that the report cannot be heard even at a rather short distance from the
place of firing.
In the drawings we have shown three preferred constructions in which the
powder gases are respectively conducted to the side, to the side and partly
rearward, and wholly rearward.
In Fig. 1 the sleeve is in the form of a perforated tube a. The deflectors or
shields may suitably be made conical or dish shaped as shown having central
penings corresponding to the projectile, thus compelling the powder gases to
scape laterally through the holes in the sleeve a.

page_text: In Fig. 2 the deflectors care of such a form as to compel the gases to escape
partly to the side and partly rearward. The deflectors are connected to the
sleeve a by the bars h.
In Fig. 3 the sleeve a with deflectors 6 is provided with an outer hood provided
with holes e at the back to compel the gases to escape rearward. A rotatable disc
or valve f having holes corresponding to the holes e may be provided for regulating
the exit area for the gases or for closing them entirely. An advantage incidental
to this construction is that the recoil of the gun may be diminished more or less
thereby. If the holes e are left open the recoil is lessened considerably, but even
if the chamber d be quite closed behind, the recoil is lessened to some extent;
this depends also upon the extent that the length of the chamber is carried
towards the rear.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. A report deadener and recoil diminisher- for guns consisting of deflecting
devices in combination with a sleeve applied to the muzzle of the gun for the
purpose of more or less deflecting the powder gases so as to facilitate their escape
to a great extent in a lateral, part lateral and part rearward, or rearward direction
substantially as set forth.
2. The construction of report deadener and recoil diminisher described with
reference to Fig. 1.
3. The construction of report deadener and recoil diminisher described with
reference to Fig. 2.
4. The construction of report deadener and recoil diminisher described with
reference to Fig. 3.
Dated this Twenty-eighth day of March 1899.
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.