IMPROVEMENTS IN STEAM AND OTHER ENGINES DRIVEN BY FLUID PRESSURE OR OTHER POWER
Year: 1884

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'I WILLIAM Ross of 60 Trinity Square Borough in the County of Surrey
Engineer do hereby declare the nature of my invention for, IMPROVEMENTS IN
STEAM AND OTHER ENGINES DRIVEN BY FLUID PRESSURE OR OTHER POWER to be
as follows:
I first provide a Cylinder of proper length and diameter to meet the requirements
of power and length of stroke. I then provide three pistons the outer two being
connected, and the inner piston moving in perfect independence of the other two.
I then provide a crank, as in the ordinary engine, and connect it with the inner
piston at any angle I form another crank or other cranks on the shaft to the
ordinary crank, and couple this or these with the outer pistons, so that when the
steam or power is let into the Cylinder at the end or commencement of each stroke
(whilst the ordinary crank is using, no power, the auxiliary crank or cranks is and
are in power from the commencement, and the ordinary crank is in power to the
finish of the stroke.
£1

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I, WILLIAM Ross, of N° 60, Trinity Square, in the County of Surrey, Engineer,
do hereby declare the nature of my invention for "IMPROVEMENTS IN STEAM AND
OTHER ENGINES DRIVEN BY FLUID PRESSURE OR OTHER POWER" and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
My invention relates to improvements in steam and other engines driven by
fluid pressure or other power.
In, putting it into practice, I provide a proper cylinder of a length and diameter
to give the necessary power. In this cylinder are three pistons, the outer two of
which are connected to a piston-rod common to them both, and which is necessarily
longer than the one next mentioned by about half the distance separating its two
pistons aforesaid. The third piston is carried on the end of a second piston-rod,
and works between the last mentioned pair of pistons.
The longer piston rod passes through the centre piston, and the shorter rod
passes through that piston on the longer rod which is nearest to the crank, shaft.
Each of the pistons through which a piston-rod passes is fitted with a suitable
double stuffing box. The two rods are placed side by side as closely as possible,
the cover of the cylinder through which they work being fitted with a duplex
stuffing box. The crank shaft, to which these are connected,. has necessarily two
throws which may be opposite each other, or at any angle the particular
circumstances of the case may render desirable.
The slide valve used for controlling the supply and exhaust is of the ordinary:
and well known type.
In order that my invention and the means by which it is to be carried into
successful operation may be thoroughly understood, I will proceed to describe it in
detail, referring in so doing to the accompanying drawings which are to be taken
as part of this specification and read therewith, and in which corresponding parts
are marked with the same reference letters throughout the figures in which they
occur.
رہا
Figure 1 is a sectional side elevation, and Figure 2 a sectional plau, illustrating
my invention adapted for being driven by steam.
I would have it distinctly understood that, in applying my invention, I may set
the cranks. at any angle to each other which may be desirable. In the figures they
are set at an angle of 130°.
Figure 3 is an elevation of the cylinder cover, shewing the duplex stuffing box,
A is the cylinder; B, B³ are the two outer pistons on the longer piston rod B¹;
C is the inner piston on the shorter piston rod C¹; D is the crank shaft, and
B, C, its throws. E is the duplex stuffing box in the cylinder cover F. G is a
steam jacket; H is a valve box, and I the slide valve, preferably driven from the
crank shaft in the ordinary way. J, J are the connecting rods, and K, K, the
guide bars.
The cycle of motions in an engine constructed according to my invention is as
follows, when the relative positions of the pistons and crank throws are as in the
figure, i.e. with the throw of the longer piston rod at the angle of maximum effect,
and that of the shorter piston about to pass under.
On the steam, or other equivalent elastic fluid, being admitted to the valve box,
it flows through the port j into the cylinder between the pistons B and C connected,
respectively, to the rods B¹ and C¹. The inner piston C is driven towards the back

page_text: end of the cylinder just past the port k, while the outer pistons B, B³ are driven
towards the fore end, until the latter piston meets the piston C opposite the port k,
both stopping short of touching each other by the width of the port. The exhaust
is now open, and fresh steam flowing from the steam chest through the port k
between the pistons C and B³, the latter are returned to the position they occupy
in the figures, thus completing one revolution of the fly wheel.
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 of a piston rod B¹ carrying two pistons B, B³, with a second
piston rod C¹ carrying one piston C working between the two former and in the
same cylinder, as described,with reference to the accompanying drawings.
2. The cylinder, with ports and duplex stuffing box on its cover, to be used
in combination with the two piston rods and three pistons as the latter are defined
in the preceding claim, as described with reference to the accompanying drawings.
Dated this 15th dow of De
1004
PHILLIPS & LEIGH,
Patent Agents,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.