ing
Year: 1888

page_text: I, ANDREW NOBLE, Companion of the Bath and late Captain in the Royal Artillery
of Jesmonddene House, Newcastle-upon-Tyne, Manufacturing Engineer, do hereby
declare the nature of this invention to be as follows :-
In the Specification of a Patent granted to me No. 4470 dated the 8th of April
1885 I described a system of breech loading ordnance According to the present
invention I adopt this system for the conversion of muzzle loading or breech loading
guns into quick firing guns-1 cut away the metal at the rear of the bore of such
guns in a conical form and on the innor surface of this cone I make the dividod screw
thread for receiving the conical divided screw upon the breech block. At the rear of
the cone I cut the metal to a cylindrical form-upon the inner surface of this cylinder
I make the divided screw thread to receive the divided cylindrical screw upon the
rear of the breech block-Outside the rear of the gun I shrink on a strengthening
hoop which also carries the hinge joint of the breech block.
For firing metallic cartridges no obturator is required, the base of the cartridge
resting directly on the breech block. For firing ordinary charges I either employ
an obturator in the form of a short metallic cartridge case with electrical or other
firing mechanism or else a special obturator which I will proceed to describe :-It
consists of a mushroom head upon a stem which is received in an axial hole in the
breech block. This stem has a hole through it for firing the charge either electrically
or otherwise-Gas is prevented from passing between the stem and the breech block
by means of a split ring which is received in grooves around the stem at the front of
the breech block and at the rear of the mushroom head. The edges of the mushroom
head rest upon the face of a metallic ring whose outer edge is in contact with the
cone at the rear of the bore of the gun-behind this metallic ring there is another
ring of asbestos or similar material. Both these rings fit in a recess in the faço
of the breech block. When the charge is fired the pressure of the gas upon the
mushroom head and upon the metallic ring tends to compress the asbestos ring, thereby
spreading it out and pressing it all round against the cone at the rear of the bore of
the gun, thereby making a gas tight joint.

page_text: 1, ANDREW NOBLE, Companion of the Bath and late Captain in the Royal Artillery
of Jesmonddene House, Newcastle-upon-Tyne, Manufacturing 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 :-
In the Specification of a Patent granted to me No. 4470 dated the 8th day of
April 1885 I described a system of breech loading ordnance. According to the
present invention I adopt this system for the conversion of muzzle loading or breech
loading guns into quick firing guns. I cut away the metal at the rear of the bore
of such guns in a conical form and on the innor surface of this cono I make the
divided screw thread for receiving the conical divided screw upon the breech block.
At the rear of the cone I cut the metal to a cylindrical or conical form-upon the
inner surface of this cylinder I make the divided screw thread to receive the divided
screw upon the rear of the breech block. Outside the rear of the gun I shrink on
a strengthening hoop which also carries the hinge joint of the breech block.
For firing metallic cartridges no obturator is required, the base of the cartridge
resting directly on the breech block. For firing ordinary charges I either employ
an obturator in the form of a short metallic cartridge case with electrical or other
firing mechanism or else a special obturator which I will proceed to describe :-It
consists of a mushroom hond upon a stem which is received in an axial hole in the
breech block. This stom has a hole through it for firing the charge either electrically
or otherwise. Gas is prevented from passing between the stem and the breech
block by means of a split ring which is received in grooves around the stem at the
front of the breech block and at the rear of the mushroom head. The edges of the
mushroom head rest upon the face of a metallic ring whose outer edge is in contact
with the cono at the rear of the bore of the gun-behind this metallic ring there
is another ring of asbestos or similar material. Both these rings fit in a recess in
the face of the breech block. When the charge is fired the pressure of the gas
upon the mushroom head and upon the metallic ring tends to compress the asbestos
ring, thereby spreading out and pressing it all round against the cone at the rear
of the bore of the gun, thereby making a gas tight joint.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shows a longitudinal section of a gun which has been converted according
to this invention. As is shown, the metal at the rear of the bore has been cut away
at a to a conical form and on this conical surface a divided screw thread is formed
as described in my Specification show feed
AL tha
the

page_text: с
cylinder another divided screw is formed. The breech block e is provided with similar
divided screws to enter the divided screws in the breech, as is well understood. On
the rear end of the gun a strengthening hoop d is shrunk. This hoop carries the pin e
upon which the breech block is hinged. is the form of obturator I employ for
firing ordinary charges, it is in the form of a short metallic cartridge case.
The charge
is fired by the pin g, but other firing mechanism may be employed.
Figure 2 shows a longitudinal section of another gun converted in a similar manner
and provided with a special obturator which I employ for firing ordinary charges.
This obturator consists of a mushroom head h upon the stem; which is received in an
axial hole in the breech block. This stem has a hole ¹ through it for firing the
charge. The edges of the mushroom head rest upon the metallic ring k which is
supported by a ring 1 of asbestos or other similar material. m is the split ring around
the stem of the obturator.
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. The method of converting guns by cutting away the metal at the rear of the
bore to a conical form and behind this cone to a cylindrical or conical form and
making divided screw threads upon the inner surface of the cone and cylinder to
receive similar divided screws upon the broech block and shrinking or otherwise fixing
a metal strengthening ring upon the outside of the rear of the gun to carry the hinged
joint of the breech block substantially as described.
2. The employment in this and other breech loading guns of an obturator made
in the form of a short metallic cartridge case substantially as described.
3. The mushroom headod obturator resting upon rings in a recess at the rear of the
bore substantially as described.
4. My various improvements in breech loading guns substantially as described.