Locomotive Steam tugines.
Year: 1885

page_text: .
Locomotive Steam tugines.
I EDWIN FODEN of Sandbach in the County of Chester Engineer do hereby
declare the nature of my invention for IMPROVEMENTS IN TRACTION
APPLICABLE ALSO TO OTHER LOCOMOTIVE STEAM ENGINES to be as follows:-
་་
ENGINES
This invention relates to that class of traction engines or other locomotive
steam engines known as compound engines" wherein the steam is first passed
through a high pressure steam cylinder (or cylinders) and then through
pressure steam cylinder before being finally exhausted.
a low
The object of my invention is to obtain an increase of power on first starting
the engine so as to overcome the vis-inertia of the weight of the engine and
its load.
This I propose to effect by temporarily suspending the compound action of the
high and low pressure steam cylinders, by causing each cylinder to receive its steam
direct from the boiler, and to exhaust its own steam direct or independently so
that the low pressure steam cylinder does not take the exhaust steam from the
high pressure steam cylinder but becomes for the time being a second high pressure
steam cylinder without creating any back pressure on the first high pressure
steam cylinder or cylinders, and thus the power of the engine becomes greatly
increased.
This I effect by providing the steam and exhaust pipe with a three way cock
or valve so arranged as to direct the steam temporarily in the way desired, and this
three way cock or valve may be provided with a separate handle or lever, or it
may be so arranged that it may be actuated by the starting lever.
In order to prevent undue strain upon the working parts of the engine
I provide the steam box of the larger or low pressure steam cylinder with a
reducing or relief valve so as to reduce the pressure therein until it is equivalent
only (or nearly so) to that in the smaller or bigh pressure steam cylinder or
cylinders and they will then work harmoniously together.
I propose also so to arrange the starting lever that when moved only a certain
distance (or "half stroke") it shall cause both cylinders so take steam direct from
the boiler and upon moving it further (or "full stroke") the compound character of
the engine shall be restored by shutting off the steam from the low pressure
cylinder and admitting it to the high pressure steam cylinder only.
GEORGE DAVIES,
Agent for the Applicant.

page_text: improvements in Traction Engines, Applicable also to other
Locomotive Steam Engines.
I EDWIN FODEN of Sandbach in the County of Chester, Engineer, do hereby
declare the nature of my invention for IMPROVEMENTS IN TRACTION ENGINES
APPLICABLE ALSO TO OTHER LOCOMOTIVE STEAM ENGINES 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 that class of traction engines or other locomotive
steam engines known as "compound engines" wherein the steam is first passed
through a high pressure ateam cylinder (or cylinders) and then through a low
pressure steam cylinder before being finally exhausted.
The object of my invention is to obtain an increase of power on first starting
the engine so as to overcome the vis-inertiae of the weight of the engine and
its load.
The nature of my improvements and the manner in which the same are to be
performed or carried into practical effect will be readily understood on reference to
the accompanying drawings and the following explanation thereof.
Fig. 1 on the drawing is a transverse section and Fig. 2, a longitudinal section of
so much of cylinders, steam-chest, and passages of a compound engine as is
necessary to illustrate my invention.
I propose to effect the above object by temporarily suspending the compound
action of the high pressure steam cylinder a, a and the low pressure steam
cylinder b, b by causing each cylinder to receive its steam direct from the boiler,
and to exhaust its own steam direct to the funnel or independly so that the
low pressure steam cylinder b, b does not take the exhaust steam from the
high pressure steam cylinder a, a but becomes for the time being an additional
high pressure steam cylinder without creating any back pressure on the first high
pressure steam cylinder or cylinders a, a and thus the power of the engine becomes
greatly increased.
This I effect by providing the steam and exhaust pipe with a three way cock
or valve c, o so arranged as to direct the steam temporarily in the way desired;
and this three way cock or valve c, c may be provided with a separate handle or
lever, or it may be so arranged that it may be actuated by the starting lever.
e, e is the exhaust passage from the three way cock to the funuel, f, f is the
exhaust passage from the high pressure cylinder a, a-g, g is the exhaust passage
from the three way cock c, c to the low pressure cylinder b, b, and h, h is the
exhaust passage from the latter to the funnel.
I propose also so to arrange the starting lever and valve that when moved only
a certain distance (or "half stroke") it shall cause both cylinders to take steam
direct from the boiler and upon moving it further (or "full stroke"") the compound
character of the engine shall be restored by shutting off the steam from the low
pressure cylinder and admitting it to the high pressure steam cylinder a, a only.
i, i is the starting valve (see also detached view Fig. 3) The opening k, k in
this valve admits steam through the passage 1, 1 to the low pressure cylinder, and

page_text: the opening m, m admits the steam through the passage n, n to the high pressure
cylinder so that upon first moving the valve the steam is admitted direct to both,
but upon moving the valve still further, both of these passages are closed and the
lip of the valve at the same time, uncovers the port o, o and admits the steam to
the high pressure cylinder only.
In order to prevent undue strain upon the working parts of the engine I prefer
to provide the. steam box of the larger or low pressure steam cylinder with a
reducing or relief valve so as to reduce the pressure therein until it is equivalent
only (or nearly so) to that in the smaller or high pressure steam cylinder or
cylinders and they will then work harmoniously together, but I do not make any
claim to this reducing or relief valve as forming any part of my invention.
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
1 claim is
In compound engines of the class herein before referred to, and having either one
or more high pressure steam cylinders in combination with one or more low
pressure steam cylinders, the use of a three way cock, or its equivalent, for the
purpose of temporarily suspending the compound action of the high pressure steam
cylinder or cylinders and the low pressure steam cylinder or cylinders, so as to
cause each cylinder to receive its steam direct from the boiler and to exhaust its
own steam direct to the funnel, or independently, so that the low pressure cylinder
does not then take the exhaust steam from the high pressure steam cylinder or
cylinders but becomes for the time being an additional high pressure steam
cylinder substantially as and for the purposes hereinbefore more particularly set
forth and described.
GEORGE DAVIES,
Agent for the Applicant.