Year: 1886

page_text: Date of Application, 18th June, 1886.
Complete Left, 14th Mar., 1887.
Complete Accepted, 26th Apr., 1887.
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 fuses and is applicable especially
to fuses to be fixed in the base of the projectile.
Direct use is made of the pressure in the gun when fired to do the work of arming
the fuse.
According to the arrangement which I prefer for a percussion fuse a transverse
bolt is provided working within a cavity in the body of the fuse and this cavity
is closed at the end by a cup or gas check. There is a small hole in the side of
the bolt and a screw thread is cut within it. The pellet at its base is provided
with a nose and this screws into the hole in the transverse bolt. On firing the
pressure of the powder gas acting against the cup or gas check moves the bolt along
in its cavity and shears the tip off the nose of the pellet. The pellet, which carries
a patch of fulminate is then free and it is thrown forward in its cavity when the
projectile strikes; then the fulminate comes against a projecting point within the fuse
cavity, it detonates and the shell explodes.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: Improvements in Fuses.
I, THORSTEN NORDENFELT of 53 Parliament Street in the City of Westminster
Civil Engineer, do hereby 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 obect improvements in fuses and is applicable especially
to fuses to be fixed in the base of the projectile.
For a percussion fuse I employ a bolt preferably a transverse bolt working within
a cavity in the body of the fuse and this cavity is closed at its mouth by a cup
or gas check. There is a small hole in the side of the bolt and a screw thread is cut
within it. The pellet is provided with a projecting pin or nose and this screws into
the hole in the bolt. On firing the pressure of the powder gas acting against the
cup or gas check moves the bolt along in its cavity and shears the tip off the
projecting pin or nose of the pellet. The pellet which carries a patch of fulminate
is then free and it is thrown forward in its cavity when the projectile strikes; then
the fulminate comes against a projecting point within the fuse cavity, it detonates
and the shell explodes.
The drawing annexed shews a longitudinal section of a fuse formed as above
described.
A is the base of a projectile-B the body of the fuse-C a transverse cavity formed
in the bass of the fuse-D a bolt lying in the cavity-E a copper cup or gas check
for preventing the powder gases from getting past the bolt and into the fuse, Fa ring
screwed into the mouth of the cavity for retaining the cup E in place. G is
the pellet with a pin H projecting from it which at its end is screwed into a hole
in the side of the bolt D. The pellet as usual carries a patch of fulminate I which
detonates when it comes against the point J.
The action of the fuses in igniting the charge of the shell may be delayed whenever
it is desired that their action shall be comparatively slow by filling part of the passage,
by which the flash from the patch of fulminate I passes to the charge in the shell,
with powder highly compressed and which will burn comparatively slowly.
Two ways of effecting this are shewn at Figures 2 and 3.
In the arrangement shewn at Figure 2 the fulminate patch would be carried
by the pellet as in Fig. 1.

page_text: In Figure 3 the point is carried by the pellet and the fulminate patch in the end
disc of the fuse. In each figure the block of highly.compressed powder is marked K.
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. A fuse in which the pellet has to be set free by the pressure of the powder gases
in the bore of the gun forcing a bolt endwise and causing it to shear a pin which
previously retained the pellet.
2. A fuse with the pellet retained by a pin projecting from it and fixed into a bolt
which works in a cavity in the body and with a cup or gas check in the mouth
of this cavity to prevent the powder gases from passing the bolt.
3. A percussion fuse formed substantially as herein before described and illustrated
in the drawings annexed.
CARPMAEL & Co.,
Agents for the Applicant.