Year: 1886

page_text: :
I, JOSIAH VAVASSEUR of the London Ordnance Works, Southwark in the County
of Surrey, Engineer do hereby declare the nature of this invention to be as
follows:-
My invention relates to gun mountings in which the recoil of the gun is
controlled by hydraulic compressors, and in which the running out of the gun
after recoil is checked by the same compressors in consequence of liquid being
admitted to the compressor cylinders during recoil whilst the escape passage is
throttled as the gun runs out.
I provide auxiliary cylinders and pistons or rams in connection with the
compressor cylinders. These are mechanically connected with the gun carriage
(or part which recoils with the gun) so that during recoil liquid is forced out of
the auxiliary cylinders into the compressor cylinders. The quantity of liquid so
made to pass into the compressor cylinders is such as just to fill the space vacated
by the piston rods. By thus forcing liquid into the compressor cylinders by the
movement of the gun itself in recoil the action in checking running out is rendered
certain and reliable.

page_text: At the commencement of the recoil the plunger is at the upper part of the
cylinder and it descends progressively as the recoil proceeds. The diameter and
the stroke of the plunger are so proportioned that during recoil the plunger forces
into the compressor cylinder e as much liquid as is required to keep it full and this
liquid enters the compressor cylinder past the valve m A light spring n tends to
keep this valve to its seat. At the end of the recoil the gun tends to run out
reversing the flow past the valve m but the valve then at once closes and the gun
is held in.
.
To allow the gun to run out when desired the valve m is forced from its seat by
means of the screw o and the liquid then passes back into the plunger cylinder h
whilst the gun runs out by gravity. If the valve m be held off its seat by the
screw o when the gun is fired, the gun will run out again automatically.
Instead
of employing the screw o and acting on the valve m a small connecting passage
may be made between the chambers above and below the valve m, and this passage
may be fitted with a plug or small valve which is opened and closed to control the
run out of the gun; the larger valve m acting automatically without requiring
any attention. I prefer to fit plungers and auxiliary cylinders to both compressor.
cylinders but it is not necessary to fit the control valve m and regulating screw o
on more than one.
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 combination with a gun and gun carriage of a plunger or equivalent
instrument moved by the gun when it recoils and then forcing liquid into an
hydraulic cylinder where its presence impedes the return or running out of the
gun substantially as described.
2. The combination consisting of a gun slide, a gun carriage traversing along
the slide; an hydraulic compressor connecting the slide with the carriage, and a
plunger moved by the gun carriage and forcing liquid past a non return valve into
the compressor cylinder when the gun recoils and so preventing the running out
of the gun until by opening a valve the liquid is released substantially as described.
8. My hydraulic controlling gear for controlling the running out of guns substan-
tially as described.
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