Year: 1887

page_text: Date of Application, 29th Mar., 1887
Complete Left, 16th Dec., 1887
Complete Accepted, 20th Jan., 1888
I, ANDREW NOBLE, a Companion of the Bath, 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 :-
The object of this invention is to provide an efficient gas check for use in the joints
of guns intended to be taken apart and for convenience of transport carried in pieces.
It has been found that the gas chocks which have acted so efficiently when employed
to retain gases in closed vessels and for certain other applications, are inefficient when
placed in the joints of guns divided as described, one reason for their failure being
that by the action of firing the joint is partially opened before the pressure of the gas
reaches the joint. To overcome this difficulty 1 form a gas check of two metal rings
of triangular section, by preference, made of manganese bronze, the diagonal face of
each bearing against one another, while the square faces press against the recess cut
in the gun. The recess is cut partly in each of the abutting faces of the two parts
which are joined together, and the gas check when expanded fills the recess. Before
the gas
check expanded the inner diameter of the ring next the bore is larger than
the inner diameter of the annular recess cut in the gun while the outside diameter of
The width of the
the outer ring is smaller than the outside diameter of the recess.
gas check before being put in position is wider than the said recess.
When the gas check is placed in the recess and the joint screwed up the outer ring
is expanded by compression and the inner ring in the same manner is contracted so
that the gas check fills the recess entirely. The action is as follows:-
When the gun is fired and the pressure of the gas reaches the inner ring it expands
it and the inclined surface pressing against that of the outer ring expands it also and
presses the surface tightly against the gun thus effectually preventing any escape of
gas. The gas check being already in a state of compression adjusts itself and the
higher the pressure the better does the gas check stop the escape of gas.
A small groove is cut round the inner diameter of the inner ring to facilitate
extraction.

page_text: COMPLETE SPECIFICATION.
Improvements in Gas Checks for the Joints of Jointed Guns.
I, ANDREW NOBLE, a Companion of the Bath, 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:
of
The object of this invention is to provide an efficient gas check for use in the joints
guns intended to be taken apart and for convenience of transport, carried in pieces.
It has been found that the gas checks which have acted so efficiently when employed
to retain gases in closed vessels and for certain other applications, are inefficient when
placed in the joints of guns divided as described, one reason for their failure being
that by the action of firing the joint is partially opened before the pressure of the gas
reaches the joint. To overcome this difficulty I form a gas check of two metal rings
of triangular section, by preference, made of steel or manganese bronze, the diagonal
face of each bearing against one another, while the square faces press against the
recess cut in the gun. The recess is cut partly in each of the abutting faces of the
two parts which are joined together-and the gas check when expanded fills the recess.
Before the gas check is expanded the inner diameter of the ring next the bore is
larger than the inner diameter of the annular recess cut in the gun while the outside
diameter of the outer ring is smaller than the outside diameter of the recess. The
width of the gas check before being put in position is wider than the said recess.
When the gas check is placed in the recess and the joint screwed up the outer ring
is expanded by compression and the inner ring in the same manner is contracted so
that the gas check fills the recess entirely. The action is as follows:-
When the gun is fired and the pressure of the gas reaches the inner ring it
expands it and the inclined surface pressing against that of the outer ring expands it
also and presses the surface tightly against the gun thus effectually preventing any
escape of gas. The gas check being already in a state of compression adjusts itself
and the higher the pressure the better does the gas check stop the escape of gas.
A small groove is cut round the inner diameter of the inner ring to facilitate
extraction.
The drawings annexed shew a joint formed in the above manner in the length of
a gun.
Figure 1 is a longitudinal section of the joint.
Figure 2 shews on an enlarged scale a cross section of the gas check rings before
compression and Figure 3 a similar view of the rings after compression.
A, B are two parts of a gun joined together in the ordinary manner by a screw
collar CD, E are the gas check rings, which are formed and act in the manner
above explained.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Forming gas checks for the joints of jointed guns substantially in the manner
above described.
2. Forming gas checks for the joints of jointed guns of two rings which are of
wedge section capable of being made to slide one within the other and are contained
in a recess formed partly in each of the two abutting lengths of the gun which are to
be joined together and which are made to completely fill such recess when the joint is
screwed up one wedge ring being then in compression and the other extended
substantially as described.