Improvements in the Arrangement of Multiple Expansion Engines for Screw Propulsion
Year: 1889

page_text: Date of Application, 2nd July, 1889.
Complete Specification Left, 1st Apr., 1890-Accepted, 3rd May, 1890
PROVISIONAL SPECIFICATION.
Improvements in the Arrangement of Multiple Expansion Engines
for Screw Propulsion.
I, HUGH DUNSMUIR of the firm of Dunsmuir & Jackson, Govan Engine Works,
Govan, in the County of Lanark, Engineer, do hereby declare the nature of this
Invention to be as follows:-
This Invention relates to the arrangement of multiple expansion engines for screw
propulsion and it consists in placing triple quadruple or compound engines athwart-
ships and connecting the high pressure intermediate and low pressure cylinders to
separate crank shafts or to the propeller shaft or shafts of a single screw or of twin
screw or multiple screw steamers so that whilst the use of separate sets of engines
for the several propeller shafts is obviated the economy and other advantages
resulting from the employment of triple or other multiple expansion engines may be
obtained.
In adapting triple expansion engines to operate the propeller shaft in a single
screw steamer the intermediate and low pressure cylinders are directly connected
each to a crank on a short shaft whilst the high pressure cylinder is connected to a
crank on the propeller shaft or the arrangement may be varied, the two side crank
shafts and the propeller shaft being connected together either by cranks discs and
connecting rods or toothed or friction gearing or like means.
In adapting triple expansion engines to operate the propeller shafts in a twin
screw steamer the high pressure and low pressure cylinders are directly connected
each to one of the crank or propeller shafts whilst the intermediate cylinder is
connected to a separate crank shaft or the arrangement may be varied; and in
order that the power and speed of rotation of the two propeller shafts may be
equalized and economical working ensured the three crank shafts are connected
together either by cranks discs and connecting rods or toothed or friction gearing
or like means
When three screws and propeller shafts are employed the cylinders of a triple
expansion engine are directly connected each to one propeller shaft and for four
screws quadruple engines are used one cylinder of the series being connected to the
propeller shaft directly under it.
Dated this First day of July 1880
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in the Arrangement of Multiple Expansion Engines
for Screw Propulsion.
I, HUGH DUNSMUIR, of the firm of Dunsmuir & Jackson, Govan Engine Works,
Govan, in the County of Lanark, 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 :—
This Invention relates to the arrangement of multiple expansion engines for screw
propulsion and it consists in placing triple quadruple or compound engines athwart-
ships and connecting the high pressure, intermediate and low pressure cylinders to
separate crank shafts or to the propeller shaft or shafts of a single screw or of twin
screw or multiple screw steamers so that whilst the use of separate sets of engines
ונו.

page_text: for the several propeller shafts is obviated the economy and other advantages
resulting from the employment of triple or other multiple expansion engines may be
obtained.
In the accompanying drawings which illustrate my Invention figures 1 and 2 are
respectively an elevation and plan showing triple expansion engines arranged and
geared to drive a single propeller shaft. Figures 3 and 4 are similar views.of triple
expansion engines as applied for driving twin screw shafts and figures 56 and 7
the same arrangement of engines applied to drive three propeller shafts. Figures 8
and represent a set of quadruple expansion tandem engines arranged to drive two
propeller shafts. Figures 10 and 11 show an arrangement of quadruple expansion
engines driving four propeller shafts, figures 12 and 13 show two cylinder compound
engines geared to drive twin screw shafts; and figures 14 and 15 show four cylinder
quadruple expansion engines arranged to drive twin screw shafts.
In adapting triple expansion engines to operate the propeller shaft in a single
screw steamer as represented at figures 1 and 2 the intermediate and low pressure
cylinders A2, A3, are directly connected each to a crank B, on a short shaft C whilst
the high pressure cylinder A¹ is connected to a crank on the propeller shaft D, or
the arrangement may be varied the two side crank shafts C, and the propeller shaft D,
being connected together either by cranks or discs D', D', and connecting rods E,
which are preferably provided in pairs and jointed as shown to ensure rotation of the
several shafts in the same direction; or toothed or friction gearing or like means
may be employed for connecting the several shafts.
In adapting triple expansion engines to operate the propeller shafts in a twin screw
steamer as represented at figures 3 and 4 the high pressure and low pressure
cylinders A', and A³, are directly connected each to one of the crank or propeller
shafts D, whilst the intermediate cylinder is connected to a separate crank shaft C,
or the arrangement may be varied, and in order that the power and speed of
rotation of the two propeller shafts may be equalized and economical working
ensured the three crank shafts are connected together either as shown by cranks or
discs and jointed connecting rods or by toothed or friction gearing or like means.
In the case of twin screws driven by two cylinder compound engines as
represented at figures 12 and 13 one cylinder is placed directly over and connected
to each shaft, the two propeller shafts being geared or connected by cranks and
connecting rods as shown. When quadruple engines are employed to drive twin
screws as represented at figures 8 and 9 the first and third cylinders A¹ A³, of the
series may be placed tandemwise over the second and fourth cylinders A3, A4, the
propeller shafts being connected as before described or the cylinders may be
arranged in pairs side by side as represented in figures 14 and 15 each pair being
connected to one shaft whilst the shafts are connected by jointed rods as in the
examples above described.
When three screws and propeller shafts are employed as shown at figures 5, 6
and 7 the cylinders of a triple expansion engine are directly connected one to each
propeller shaft, the shafts being connected by cranks or by gearing as before
described, and for four screws quadruple engines as represented at figures 10 and 11
are used the cylinders of the series being connected each to the propeller shaft
directly under it whilst the several crank shafts are in like manner connected
together.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what I
claim is :-
1. The arrangement of multiple expansion marine engines with the cylinders placed
in line athwartships the cylinders being connected singly or in pairs to separate
shafts and the shafts connected or geared to rotate in unison substantially as
described.
2. In multiple expansion engines the combination of a series of cylinders con-

page_text: nected singly or in pairs to separate shafts and a series of connecting rods for
connecting together said shafts and transmitting the power from the several
cylinders substantially as described.
Dated this Thirty-first day of March 1890.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.