Improvements in Guns and Gun Mountings, and Appliances connected therewith.
Year: 1898

page_text: Date of Application, 18th Feb.,
1898
Complete Specification Left, 18th Nov., 1898-Accepted, 28th Jan., 1899
Improvements in Guns and Gun Mountings, and Appliances
connected therewith.
I, JOSIAH VAVASSEUR, a Companion of the Bath, of 8, Great George Street,
Westminster, in the County of Middlesex, do hereby declare the nature of this
invention to be as follows:-
According to this invention the trunnions are fixed to two longitudinal dovetailed
bars fitting into dovetailed recesses at the sides of the gun. A side plate is fixed to
each bar the two plates being connected beneath the gun by a forging or the like
which supports the ordinary recoil and spring cylinders. Beneath the gun is a lug
to which is pivotted a nut provided with an interrupted screw thread engaging with
a corresponding screw on the piston rod of the recoil cylinder. The nut has two arms
fixed to it the ends of which engage with the rods of the running out springs. By
turning the arms and nut therefore the gun is entirely freed from the recoil and
running out mechanism and can be removed from the mounting by moving it
rearwards to the ends of the dovetailed bars. A stand or carriage is provided for
receiving the gun when thus dismounted. This carriage has a pivotted frame with
two side bars corresponding to the dovetailed bars of the mounting and provided with
grooves rollers or the like so that the gun can readily run on them. The forward end
of the frame has a strut or support to steady it and the height of this and of the pivots
can be varied so as to bring the side bars of the frame into line with the dovetailed
bars whether the latter be elevated or depressed, the gun can therefore be run both
on and off the mounting by gravity.
The bearing of each trunnion is carried by an upright fixed to the ends of two
arms which project horizontally one above the other from the hollow pivot which is
supported as is usual on a fixed central column.
One or it may be both of the uprights has fixed to it a vertical side plate serving
as a support for the training and elevating gear and also the shield if there be
one.

page_text: invention and in what manner the same is to be perforined, to be particularly
described and ascertained in and by the following statement :-
According to this invention the trunnions are fixed to two longitudinal dovetailed
bars fitting into dovetailed recesses at the sides of the gun. A side plate is fixed
to each bar the two plates. being connected beneath the gun by a forging or the
like which supports the ordinary recoil and spring cylinders. Beneath the gun is a
lug to which is pivotted a nut provided with an interrupted screw thread engaging
with a corresponding screw on the piston rod of the recoil cylinder. The nut has
two arms fixed to it the ends of which engage with the rods of the running out
springs. By turning the arms and nut therefore the gun is entirely freed from
the recoil and running out mechanism and can be removed from the mounting by
moving it rearwards to the ends of the dovetailed bars.. A stand or carriage is
provided for receiving the gun when thus dismounted. This carriage has a pivotted
frame with two side bars corresponding to the dovetailed bars of the mounting and
provided with grooves, rollers or the like so that the gun can readily run on them.
The forward end of the frame, has a strut or support to steady it and the height
of this and of the pivots can be varied so as to bring the side bars of the frame into
line with the dovetailed bars whether the latter be elevated or depressed; the gun can
therefore be run both on and off the mounting with the assistance of gravity.
The bearing of each trunnion is carried by an upright fixed to the ends of two arms
which project horizontally one above the other from the hollow pivot which is sup-
ported as is usual on a base or deck ring.
One or it may be both of the uprights has fixed to it a vertical side plate serving
as a support for the training and elevating gear and also the shield if there be one..
Figure 1 is a side elevation and Figure 2 a plan of a gun and mounting con-
structed according to this invention. Figure 3 is a rear elevation and Figure 4 a
vertical section through the trunnions.
a is. the gun. b are the trunnions fixed to the dovetail bars c fitting into corre
sponding recesses in the sides of the gun. d d are side plates fixed to the bars c and'
connected together by the forging e. f is a lug on the gun a to which is pivotted
the nut g having an interrupted thread engaging with a corresponding thread on the
piston rod of the recoil cylinder. j are arms fixed to the nut their ends entering
recesses in the rods k of the running out springs and being secured by a screw
(Figure 2). By turning the arms j into the dotted position (Figure 3) the gun is
freed from the recoil and running out mechanism.
Figure 5 is a rear elevation and Figure 6 a side elevation of the carriage for
receiving the gun when dismounted. mm are side bars pivotted at m¹ m² to front
and rear bogies. The front bogie consists of struts n connected by right and left
screws ¹ so that their inclination and consequently the height of the pivot can be
varied. The pivots m² on the rear bogie are carried by vertical racks o gearing with
wheels o. The wheels o¹ are driven one directly and the other through a wheel. o²
on its spindle by wheels o³ on a shaft of. One of the wheels 03 also gears with a
horizontal rack 05 formed on a hydraulic cylinder o by which it can be moved to and'
fro. m³ are dovetail rollers pivotted to the bars m and fitting the dovetail grooves
in the sides of the gun. The ends of the bars m fit into recesses c in lugs at the
rear ends of the bars c on the carriage. p are the trunnion bearings carried by up-
rights.q fixed to the ends of arms projecting from the hollow pivot & supported on
the deck ring t. u is a side plate fixed to one of the uprights and supporting the
training and elevating gear.
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 The dovetailed sido have

page_text: 2. Connecting the rod of the recoil cylinder to the gun by means of an interrupted
screw.
3. The combination of an interrupted screw thread on the rod of the recoil
cylinder, a corresponding nut pivotted to the gun and arms fixed to the nut and
engaging with the rods of the running out springs.
4. The combination of two dovetailed side bars carrying the trunnions and fitting
devetailed recesses in the gun, side plates fixed to the bars and a forging or the like
connecting the side plates and carrying the recoil and spring cylinders.
5. A stand or carriage having two pivotted side bars provided with grooves, rollers
or the like to receive the gun.
6. The combination with the subject matter of the preceding claim of means for
raising and lowering the pivots.
7. Gun mountings substantially as described and illustrated in the drawings.
8. Stands or carriages substantially as described and illustrated in the drawings.
Dated this 18th day of November 1898.
CARPMAEL & CO.,
Agents for the Applicant.