Year: 1886

page_text: '
Date of Application, 23rd July, 1886.
Complete Left, 22nd Apr., 1887.
Complete Accepted, 24th May, 1887.
DECEDI
I THORSTEN NORDENFELT of 53 Parliament Street in the City of Westminster
Civil Engineer do hereby declare the nature of this invention to be as follows:-
This invention has for its object improvements in apparatus to facilitate drill and
practice with heavy ordnance.
The apparatus is applicable to ordnance in which the breech is closed by a block
locked in place by divided screw threads and in which the joint is rendered gastight
by an "obturateur" or gas check having a stem in which is the vent passing through
the breech block.
I remove the "obturateur" or gas check and I fit into the gun a tubular metallic
lining which is held centrally in place by a disc at its fore end fitted to the bore and a
flange in rear adapted to the seating which is provided at the breech end of the bore
for the obturateur or gas check.
This lining is locked in place by a screw.
Within the lining a barrel, conveniently of about one inch bore is provided, it is so
held that its axis is coincident with that of the gun or piece of ordnance. The
barrel can turn freely in the lining but with sufficient friction to prevent accidental
movement.
Into the breech block to occupy the place of the stem of the "obturateur" or, gas
check I fit a bolt or part containing within it a firing pin and spring; its fore end is
adapted to close the breech end of the inner barrel, it is also armed with an extractor
and with a fork which engages with recesses in a collar at the breech end of the
barrel.

page_text: The drill and practice with the gun is conducted as when firing the heavy projectile
and powder charge with the single exception that in place of employing these the
smaller cartridge is inserted into the inner barrel. In advancing the breech block
the fork on the bolt engages with the collar on the barrel and the extractor passes in
front of the flange of the cartridge. Then on turning the breech block to lock it the
barrel turns within the lining.
The gun is fired as when fully loaded usually by a hammer operated by a lanyard.
The shot can be observed upon a target at ordinary practice ranges.
In opening the breech after firing when the breech block is turned the barrel again
turns with it in the lining and when the breech block is withdrawn the extractor
removes the cartridge case from the barrel.
CARPMAEL & Co.,.
Agents for the Applicant.

page_text: Improvements in Apparatus to Facilitate Drill and Practice with
Heavy Ordnance.
1, THORSTEN NORDENFELT of 53 Parliament Street in the City of Westminster,
Civil Engineer, 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 :-
This invention has for its object improvements in apparatus to facilitate drill and
practice with heavy ordnance.
The apparatus is applicable to ordnance in which the breech is closed by a block
locked in place by divided screw threads and in which the joint is rendered gastight,
by an "obturateur" or gas check having a stem in which is the vent passing through
the breech block.
I remove the "obturateur" or gas check and I fit into the gun a tubular metallic
lining which is held centrally in place by a disc at its fore end fitted to the bore and a
flange in rear adapted to the seating which is provided at the breech end of the bore
for the obturateur or gas check.
This lining is locked in place by a screw.
Within the lining a barrel conveniently of about one inch bore is provided, it is so
held that its axis is coincident with that of the gun or piece of ordnance. The barrel
can turn freely in the lining but with sufficient friction to prevent accidental
movement.
Into the breech block to occupy the place of the stem of the "obturateur" or gas
check I fit a bolt or part containing within it a firing pin and spring; its fore end is
adapted to close the breech end of the inner barrel, it is also armed with an extractor
and with a fork which engages with recesses in a collar at the breech end of the
barrel.
The drill and practice with the gun is conducted as when firing the heavy projectile
and powder charge with the single exception that in place of employing these the
smaller cartridge is inserted into the inner barrel. In advancing the breech block the
fork on the bolt engages with the collar on the barrel and the extractor passes in front
of the flange of the cartridge. Then on turning the breech block to lock it the barrel
turns within the lining.
The gun is fired as when fully loaded usually by a hammer operated by a lanyard.
The shot can be observed upon a target at ordinary practice ranges.
In opening the breech after firing when the breech block is turned the barrel again
turns with it in the lining-and when the breech block is withdrawn the extractor
removes the cartridge case from the barrel.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section of the breech end of a gun fitted with a tubo
constructed according to my invention. Figure 2 is a front view, figure 3 a plan and
figure 4 a longitudinal section of the fore end of the bolt (to a larger scale) and
figure 5 is a rear view of the small barrel.
a is the tubular lining which is held centrally within the large barrel by means of
the disc at its fore end and by the flange c at the rear end, which abuts against the
shoulder provided for the obturator. The lining is locked in place by means of the
screw d.
e is a barrel which can turn freely within the lining. f is a bolt occupying
the place of the stem of the obturator. It contains within it a firing pin 9 and
spring h. Its fore end closes the opening of the small barrel e and it is provided
with an extractor j. The bolt is also provided with a fork k which engages with
recesses in the collar m at the breech end of the barrel e.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. Apparatus to facilitate drill and practise with heavy ordnance consisting of a
small barrel to be fitted inside the larger barrel, and a small breech block to be
attached to the larger breech block so as to move with it substantially as described.
2. The arrangement of liner to receive the small barrel substantially as described.
3. A bolt containing a firing pin and extractor which occupies the place of the
obturator substantially as described.
4. Mounting the small barrel so that it turns with the breech blocks substantially
as described.
5. The apparatus substantially as described and shown in the drawings.