Improvements in the Manufacture of Twisted Gun and Pistol Barrels.
Year: 1885

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Twisted Gun and Pistol
Barrels.
I WILLIAM JAMES of No 32 Legge Street Birmingham in the County of
Warwick Gun Barrel Manufacturer do hereby declare the nature of the said
Invention for "
IMPROVEMENTS IN THE MANUFACTURE OF TWISTED GUN AND
PISTOL BARRELS" to be as follows:-
:―
My invention consists in manufacturing twisted gun and pistol barrels in the
following manner. I take rods of iron square in cross section and heating them to
a red heat twist them in the ordinary way. I roll these twisted rods into flat bars
preferably broader on one surface than on the other. I take two of these bars
preferably twisted in opposite directions that is one having a right handed twist
and the other a left handed twist and I coil the said flat bars side by side around
a mandril the broader faces of the bars being outside. The convolutions of the
bars thus coiled have the figure of a double threaded screw. The coil being
heated to a welding heat the coils are welded into a barrel by the ordinary
process.
Although I prefer to employ only two of the coils described yet three or more of
the said coils coiled side by side on the mandril may be employed and although
I prefer to roll the twisted rods broader on one face than on the other that is with
their edges inclined as a sounder welding is obtained with the said bars than is
obtained with bars whose adjacent sides are at right angles yet I do not limit
myself thereto as the said twisted bars may be rolled into bars having their
adjacent sides at right angles and the advantages of my invention may be for the
most part secured by the use of bars of the last described kind.
By manufacturing twisted gun and pistol barrels according to my invention a
sounder welding is obtained than in the ordinary method of manufacture and
consequently fewer wasters are produced. One welding process is saved and the
loss of iron by oxidation when a second welding is resorted to as in the ordinary
method of manufacture is wholly avoided.
Dated this fourteenth day of January 188”
W. T. WHITEMAN,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
.
Improvements in the Manufacture of Twisted Gun and Pistol
Barrels.
I WILLIAM JAMES of N° 32 Legge Street, Birmingham in the County of
Warwick, Gun Barrel Manufacturer, do hereby declare the nature of my Inven-
tion for "IMPROVEMENTS IN THE MANUFACTURE OF TWISTED. GUN AND PISTOL
BARRELS," and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :—
My invention consists in manufacturing twisted gun and pistol barrels in the
following manner. I take rods of iron square or of other figure in cross section
and heating them to a red heat twist them in the ordinary way I roll these
twisted rods into flat bars preferably broader on one surface than on the other:
I take two of these bars preferably twisted in opposite directions, that is, one
having a right handed twist and the other a left handed twist, and I coil the
said flat bars side by side around a mandril the broader faces of the bars being
outside. The convolutions of the bars thus coiled have the figure of a double
threaded screw. The compound coil being heated to a welding heat the individual
coils are welded into a barrel by the ordinary process.
Although I prefer to employ only two of the coils described yet three or more of
the said coils coiled side by side on the mandril may be employed and although
I prefer to roll the twisted rods broader on one face than on the other, that is,
with their edges inclined as a sounder welding is obtained with the said bars than
is obtained with bars whose adjacent sides are at right angles yet I do not limit
myself thereto as the said twisted bars may be rolled into bars having their
adjacent sides at right angles and the advantages of my invention may be for the
most part secured by the use of bars of the last described kind.
Figure 1 of the accompanying Drawing represents a rod of iron square (or of
other figure) in cross section before twisting and Figure 2 represents the said rod
after it has been twisted; Figure 3 represents a flat bar produced by rolling the
twisted rod Figure 2. The bar Figure 3 is made preferably broader on one surface
than on the other as represented in the cross section, but twisted rods of the kind
represented in Figure 2 may be rolled into bars having the adjacent sides at right
angles as represented in Figure 4; Figure 5 represents in side elevation a compound
coil made according to my invention the said compound coil being produced by
coiling three rolled bars either of the kind represented in Figure 3 or of the kind
represented in Figure 4 side by side around a mandril, the broader faces of the bars,
when bars of the kind represented in Figure 3 are used, being outside. The three
flat bars coiled side by side upon the mandril are marked respectively a, b, c in
Figure 5, the convolutions of the coiled bars a, b, c having the figure of a treble
threaded screw.
The compound coil Figure 5 being heated to a welding heat the
individual coils are welded together into a gun or pistol barrel by the ordinary
process.
The flat bars a, c are made from twisted rods having, say, a right handed twist,
while the middle flat bar b is made from a twisted rod having a left handed twist.

page_text: When two of the flat bars Figure 3 or Figure 4 are used to form the
compound coil, the said bars are made from rods which have been twisted in
opposite directions.
When more than three flat bars are used to form the compound coil the said
bars are arranged side by side so that adjacent bars have a different twist but I do
not limit myself thereto as the several flat bars from which the compound coil is to
be made may have the same twist given to them.
By manufacturing twisted gun and pistol barrels according to my invention a
sounder welding is obtained than in the ordinary method of manufacture and
consequently fewer wasters are produced. One welding process is saved and loss
of iron by oxidation when a second welding is resorted to as in the ordinary
method of manufacture is wholly avoided.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what
I claim is
Manufacturing twisted gun and pistol barrels by coiling two or more rolled flat
bars side by side upon a mandril and afterwards welding the compound coil into a
barrel by the ordinary process, the said flat bars being produced from twisted rods
of iron substantially as hereinbefore described and illustrated in the accompanying
Drawing.