IMPROVEMENTS IN COMPOUND TRIPLE AND QUADRUPLE EXPANSION STEAM ENGINES
Year: 1886

page_text: Steam Engines.
I JOSEPH CHAPMAN 9 London Row Leith in the County of Midlothian, N.B.
Engineer do hereby declare the nature of my invention for IMPROVEMENTS
IN COMPOUND TRIPLE AND QUADRUPLE EXPANSION STEAM ENGINES to be as
follows:-
This invention consists in forming a small or high pressure cylinder, within a
larger or low pressure cylinder, projecting up from its bottom cover, in which are
cast the steam supply ports. A second or intermediate cylinder rises from the
upper cover in a similar manner. The pistons of the three cylinders are combined
on one piston rod K. Steam regulating valves V. 1. and V. 2. are of the piston
type. The low pressure valve V. 3. is an ordinary slide, all attached to one valve
spindle M. (As Compound) the Boiler steam would be admitted to valve chests
S&D direct, the exhaust from each entering casing G. (For Triple expansion) as
shewn in plan Boiler steam enters at, S, only, for the supply of high pressure
cyl H exhaust from this passes up pipe, C, to chest, D, and cylinder I. The
exhaust from I, only entering casing G, for the supply of cylinder L. For
Quadruple Expansion, an extra cylinder acting on same shaft would be supplied
with steam from cylr L
4000

page_text: Improvements in Compound, Triple, and Quadruple Expansion
Steam Engines.
I, JOSEPH CHAPMAN, 9 London Row North Leith, in the county of Mid Lothian,
Engineer do hereby declare the nature of my invention for IMPROVEMENTS IN
COMPOUND TRIPLE & QUADRUPLE EXPANSION STEAM ENGINES and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
In order that my invention may be clearly understood I now more particularly
set forth the system, mode or manner, in which the same is, or may be particularly
carried into effect; reference being had to the Drawings accompanying Provisional
Specification, and the numbers and letters figured thereon.
Fig. 1 is a sectional elevation.
2
"
""
" "
half front view.
3 plan looking on Cylinder top.
ג
"
This invention consists in forming a small or high pressure Cylinder H, within a
larger or low pressure Cylinder L, the small Cylinder may be cast with, or attached
to, the bottom cover of the large Cylinder, and rises up within it, sufficient to allow
the piston to travel the full stroke, steam passage A, and exhaust B, are formed in
lower flange. A second or intermediate Cylinder is formed by a dome being cast
on the upper cover of Cylinder L, which is connected to steam chest D by port E.
The pistons P P P of three Cylinders are combined on one rod K. The high
pressure valve V.1 and intermediate V.2 are of the piston type, the low
pressure V.3 is an ordinary slide valve, rod M moving three valves, regulates the
steam supply to the Cylinders.
The accompanying Drawing shews the triple arrangement, Steam from the
Boiler, is admitted at S below piston valve V. 1 for the supply of the up stroke of
Cylinder H, on the down stroke this steam exhausts through port B and up pipe O,
(which may be a passage cast on side of valve chest,) to chest D, for the supply of
Cylinder I, the exhaust from this enters low press Cylinder casing G, then by
ports F F to Cylinder L.
As a compound engine the Boiler steam would be admitted to chest D´as well
as S, each exhausting into low press valve casing G.
As quadruple expansion an extra Cylinder would be placed long side those
already described, driven by the exhaust steam from Cylinder L
.
Having now described my invention I would observe in conclusion, what I con-
sider novel and original, and thereby claim as the invention secured to me by the
herein before, in part, Letters Patent, is
First. The forming on the bottom cover of any steam Cylinder, a smaller Cylinder
which is made to project into the larger one, with the steam passages all as herein-
before described and shown on the accompanying Drawing.
;

page_text: Second. The combining of the three Pistons and their connections to one Rod
substantially and for the purposes as hereinbefore described having reference to the
accompanying Drawing.
Third. The arrangement of ports, valves and their connections whereby the
steam supply and exhaust of the three Cylinders, is regulated by one Rod, as herein-
before described and shown by the accompanying Drawing.
1
1000