Firearm Page: 2 of 3
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UNITED STATESPATENTOFFICE.
JOSEPH H. BURNAMAN, OF BEAUMONT, TEXAS.
FIREARM.1,180,760.
Specification of Letters Patent.
Patented Apr. 25,1916.
Application filed July 21, 1915. Serial No. 41,142.
To all whom it may concern:
Be it known that I, JosEPH H. BUENA-
MAN, a citizen of the United States, resid-
ing at Beaumont, in the county of Jeffer-
5 son and State of Texas, have invented cer-
tain new and useful Improvements in Fire-
arms; and I do hereby declare the follow-
ing to be a full, clear, and exact descrip-
tion of the invention, such as will enable
10 others skilled in the art to which it apper-
tains to make and use the same.
My invention relates to firearms, and more
particularly to guns having interchangeable
barrels.
15 My object is to furnish a means whereby
a gun may be changed from a shot gun to a
rifle at the pleasure of the user, one stock
and loading mechanism being used for both
shotgun and rifle barrels.
2o In the accompanying drawings which are
made a part of this application, Figure 1 is
a central, longitudinal, sectional view of
the front end of a shot gun stock and the
breech end of a rifle barrel showing the
5 manner of connecting the two parts, Fig. 2
is a longitudinal, central, sectional view of
the breech end of a rifle barrel showing the
barrel chamber and shoulders, Fig. 3 is a
longitudinal, central, sectional view of a de-
o tachable firing chamber, Fig. 4 is a rear or
butt view of Fig. 3, and Fig. 5 is a view of
the front or muzzle end of Fig. 3.
In the detailed description of the draw-
ings, figures will be used to designate the
5 various parts, the same figure indicating the
same part throughout the different views.
In attaining the object of my invention, a
shotgun is used in which loaded shells are
operated through a magazine, to repeat the
0 firing of the gun. The front end of the
stock thereof is shown at 1, the barrel being
connected to the stock by screw threads as at
2 or by other means, according to the differ-
ent makes of shotguns. When it is desired
5 to convert the shotgun into a rifle the barrel
is removed from the stock and a rifle barrel
3 having screw threads 4 at the breech end
thereof, or other means adapted to the make
of shotgun used, is inserted in the stock of
the shotgun 1 in lieu of the shot gun barrel,
said rifle barrel being made identical with
the shot gun barrel as to means for attach-
ing to said stock. The said rifle barrel has
a tapered chamber 5 at the breech end there-
of into which is inserted a detachable fir-
ing chamber 6 from the magazine of thegun, said firing chamber carrying a rifle
cartridge. The rifle barrel at the outer end
of the chamber 5, is formed with an annular
shoulder 5', forming an abutment for the 60
end of the firing chamber 6. The said fir-
ing chamber 6 constitutes the means which
enables the user of the gun to operate the
rifle cartridges through the loading mecha-
nism intended for and adapted to the use 65
of shotgun shells by increasing the size of
the rifle cartridges to that of shotgun shells.
The firing chamber 6 fits snugly into the
tapering chamber 5 and carries the rifle
cartridge 7. The rim 8 of the firing cham- 70
ber 6 is of the same diameter as the rim
of a shotgun shell, so that it can be operated
by the automatic loading device connected
with the magazine of the shotgun stock.
In construction the firing chamber 6 is 75
made longer than the rifle cartridges to be
used, so that the end thereof projects be-
yond the bullet 10 carried by the cartridge
for the purpose of protecting it from being
damaged in any way while being manipu- 80
lated by the loading mechanism. The fir-
ing chamber 6 fits the tapered chamber 5.
This tapered shape prevents the use of a
shotgun shell by mistake, as the size of the
shell at its front end would prevent the 85
shell from entering the tapered chamber 5
far enough to be exploded, thus preventing
an accident arising from using a shotgun
shell with a rifle barrel. The said firing
chamber is provided with a rim 8 at its 9o
rear end whereby it is extracted from the
barrel by the shell extractor of the shot-
gun in the same manner that a shell is ex-
tracted. By providing the chamber 5 with
an annular abutment, it is obvious that the 95
firing chamber will not bind in the barrel,
as would be the case if a tapering firing
chamber was inserted into a tapering cham-
ber without an abutment. Where the cham-
ber is not provided with an abutment, a fir- loo
ing chamber is liable to jam, requiring the
reaming of the same from the chamber, a
dangerous as well as expensive and difficult
operation, especially the former if the bullet
contained in the firing chamber could not be 105
extracted prior to the reaming operation.
Perforations 9 are provided on opposite
sides adjacent the rear end of the firing
chamber slanting downwardly and rear-
wardly to provide a means for removing tii
the cartridge from the firing chamber, when
it is desired to do so, by pushing a wire
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Burnaman, Joseph H. Firearm, patent, April 25, 1916; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth858937/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.