Improvements in Fluid-pressure Engines.
Year: 1890

page_text: Date of Application, 16th Jan., 1890
Complete Specification Left, 16th Oct., 1890-Accepted, 22nd Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in Fluid-pressure Engines.
I, ROBERT MUDGEMARCHANT of 26 Wellington Street, Upper Street, Islington in
the County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
My invention has reference to engines worked by steam or other fluid pressure and
consists in constructing them in such manner that the high pressure steam (or other
fluid) after having done its work in a cylinder on one side of the piston is divided
into two portions the one of which goes to the other end of the same cylinder so as
to act against the other side of the piston after which it is condensed in the ordinary
manner while the other portion is delivered to another cylinder so as to operate the
piston of same. The capacity of the first cylinder at the end to which the steam is
first admitted is considerably reduced by enlarging the diameter of the piston rod,
and this can conveniently be effected by fitting a concentric sleeve thereto.
For the purpose of my invention I provide between the high pressure steam supply
pipe and the first cylinder a valve box and valve with ports or passages communi-
cating respectively with the two ends of this cylinder; and on the other side or at
another part of this cylinder I provide another valve box and valve having ports or
passages communicating also respectively with the two ends of this cylinder, and
other ports or passages communicating respectively with a second cylinder and with
a condenser. The high pressure steam is admitted by the first named valve to one
end of the first cylinder and causes the piston to make its forward stroke. Then this
valve having cut off the supply one portion of the steam passes through the box of
this valve to the other end of the cylinder so as to cause the piston to make its
return stroke while the other portion of the steam passes through the valve and valve
box at the other side of the cylinder to the second cylinder so as to operate the piston
of same. The delivery of these two portions should be such that the two cylinders
shall work with equal expansion of the original steam charge.
On the completion of the return stroke of the piston of the first cylinder the
valve in the second valve box is in such a position that the steam which has just
acted in this return stroke exhausts through a suitable pipe or passage to a condenser
where it is condensed. The steam which has expanded in the second cylinder is
mixed with the condensation water and with air and returned to the boiler in the
form of vapor, and this can be effected in the manner described in the Specification
of my Patent No. 16525 of 1884.
The engine is fitted with ordinary excentrics and rods set so as to work the valves
in the required manner and at the necessary periods for carrying out the operations
above described.
1
2000
ມ
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Fluid-pressure Engines.
I, ROBERT MUDGEMARCHANT of 26 Wellington Street, Upper Street, Islington in
the County of Middlesex, Civil 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 :-
My invention has reference to engines worked by steam or other fluid pressure
and which are constructed in such manner that the high pressure steam or other fluid

page_text: after having done its work in a cylinder on one side of the piston is divided into two
portions, the one of which goes to the other end of the same cylinder, so as to act
against the other side of the piston after which it is condensed in the ordinary manner
while the other portion is delivered to another cylinder so as to operate the piston of
same. The capacity of the first cylinder at the end to which the steam is first
admitted is considerably reduced by enlarging the diameter of the piston rod and
this can conveniently be effected by fitting a concentric sleeve thereto.
For the purpose of my invention I provide between the high pressure steam supply
pipe and the first cylinder, a valve box and valve with ports or passages communi-
cating respectively with the two ends of this cylinder and on the other side or at
another part of this cylinder I provide another valve box and valve having ports or
passages communicating also respectively with the two ends of this cylinder and other
ports or passages communicating respectively with a second cylinder and with a
condenser. The high pressure steam is admitted by the first named valve to one end
of the first cylinder and causes the pistor to make its forward stroke. Then the valve
having cut off the supply, one portion of the steam passes through the box of this
valve to the other end of the cylinder, so as to cause the piston to make its return
stroke, while the other portion of the steam passes through the valve and valve box at
the other side of the cylinder to the second cylinder, so as to operate the piston of
same. The delivery of these two portions should be such that the two cylinders
shall work with equal expansion of the original steam charge.
On the completion of the return stroke of the piston of the first cylinder, the
valve in the second valve box is in such a position that the steam which has just acted
in this return stroke exhausts through a suitable pipe or passage to a condenser where
it is condensed. The steam which has expanded in the second cylinder can be mixed
with the condensation water and with air, and returned to the boiler in the form of
vapour, and this can be effected in the manner described in the Specification of my
Patent No. 16525 of 1884.
Figure 1 of the accompanying drawings is a vertical section and
Figure 2 a plan of an engine constructed in accordance with this invention.
A is the cylinder to which the steam or other fluid is first admitted. B is the
piston of this cylinder shown at the upper part of its stroke. The capacity of the
cylinder A at the lower end, that is to say the end to which the steam is first admitted
is considerably reduced by fitting a concentric sleeve ( around the piston rod D, so
as to enlarge its diameter. E is the high pressure steam supply pipe communicating
between the boiler and the valve box F. In this valve box is a valve G and an
adjustable check valve H, which latter valve is kept in equilibrium by means of a
passage, either formed through it or carried outside the valve box as shewn at I.
The valve box has two ports or passages K and L, communicating respectively with
the two ends of the cylinder A.
At the other side of the cylinder A is another valve box M and valve N, this valve
box having two ports or passages P and Q also communicating respectively with the
two ends of the cylinder A. The valve box M has also ports or passages R and S
communicating respectively with a second cylinder and with a condenser. The high
pressure steam supplied at E and entering the valve box F passes through the port or
passage K which is then in communication with E, to the lower end of the
cylinder A and causes the piston B to make its forward or upward stroke. Then the
steam supply being cut off one portion of the steam in the lower end of A passes
through port K, valve box F and port L to the other end of the cylinder, so as to
cause the piston B to make its return stroke, and the rest of the steam in the lower
end of A passes through the port P, valve box M and port R to the second cylinder
so as to operate the piston of same.
At any determined point in the return stroke of the piston B, the valve N is in
such a position that the steam above the piston B exhausts through port Q, valve
box M, and port S to a condenser where it is condensed. The steam which has
expanded and produced power in the second cylinder can after its expansion be
supplied with the condensation water and with air, and returned to the boiler in the

page_text: form of vapour by the means and in the manner described in my former Specification
already herein referred to.
The engine is fitted with ordinary excentrics and rods set so as to work the valves
in the required manner, and at the necessary periods for carrying out the operations
above described.
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. In fluid pressure engines in which the motive fluid after having done its work
in a cylinder on one side of the piston is divided into two portions which go
respectively to the other end of the same cylinder and to another cylinder, an
arrangement of valve boxes, valves and ports or passages, substantially as herein-
before described whereby the fluid is first admitted through the first valve box to the
one end of the first cylinder and after having done its work therein is then divided
part of it passing through the same valve box to the other end of the same cylinder,
and part of it through a second valve box to another cylinder this second valve box
also serving to exhaust the second end of the first cylinder as set forth.
2. Constructing fluid pressure engines as hereinbefore described and represented in
the accompanying drawings.
Dated this 13th day of Octahan 1800.
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.