Year: 1888

page_text: Date of Application, 7th July, 1888
Complete Specification Left, 30th Mar., 1889
Complete Specification Accepted, 18th May, 1889.
We, WILLIAM HARGREAVES, and WILLIAM INGLIS, of Soho Iron Works, Bolton, in
the County of Lancaster, Engineers, do hereby declare the nature of this Invention
to be as follows, that is to say:-
Our said Invention relates to combined arrangements of compound steam engines
and boilers of the kind described in our Patent Specification No. 6221 of 1885; and
our object is to secure a satisfactory and improved governing action in compound
engines when worked with compound boilers as described in our said Specification.
In compound engines working with steam from a single boiler or set of boilers,
when arranged to be controlled automatically by a speed governor it is a common
practice and sufficient for ordinary purposes, to make the governor mechanism act on
the steam admission valve or valves of the bigh pressure cylinder or cylinders, the
valves of the second-stage or later-stage cylinder or cylinders, whilst in many cases
adjustable by hand, not being acted on by the governor. With our improved system
of compound engines. worked with steam from compound boilers there is a com-
paratively large supply of steam available for working the second-stage or later-stage
cylinder or cylinders; and when a variation takes place in the quantity of steam
admitted to the high-pressure cylinder or cylinders a corresponding variation does
not take place in the steam admitted to the other cylinders if only the valve or
valves of the high-pressure cylinder or cylinders are controlled by the governor. The
controlling action of the ordinary governor arrangement is consequently insufficient,
or not well distributed throughout the several cylinders; and to remedy this defect
we by our present Invention apply to the second-stage cylinder or cylinders, and
10 later-stage cylinders if there are any, valves and valve gear arranged to be
automatically controlled by a speed governor just like those of the high-pressure
inder or cylinders. In such governor-controlled valve gear we apply any suitable
adjusting devices for regulating the relative proportional extents of the action of the
governor on the valves of the several cylinders, as may be found to work best in
practice

page_text: With the improved arrangements hereinbefore described, when the period of
admission to the second-stage or later-stage cylinder is by the governor action
diminished or increased (as well as that to the high-pressure cylinder or cylinders) in
consequence of a change of load which may be temporary, there results an increase
or diminution, respectively, of the store of steam in the intermediate or low-pressure
boiler which acts advantageously when the governor next alters the period of
fadmission in the opposite direction, and renders the governing action better than
when applied to the high-pressure cylinder or cylinders only.
Dated thin sixth day of Luna 1000

page_text: Improvements relating to Compound Steam Engines and Boilers.
We, WILLIAM HARGREAVES, and WILLIAM INGLIS, of Soho Iron Works, Bolton, in
the County of Lancaster, Engineers, 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 that is to say :-
Our said Invention relates to combined arrangements of compound steam engines
and boilers of the kind described in our Patent Specification No. 6221 of 1885; and
our object is to secure a satisfactory and improved governing action in compound
engines when worked with compound boilers as described in our said Specification.
In compound engines working with steam from a single boiler or set of boilers,
when arranged to be controlled automatically by a speed governor, it is a common
practice and sufficient for ordinary purposes to make the governor mechanism act on
the steam admission valve or valves of the high-pressure cylinder or cylinders, the
valves of the second-stage or later-stage cylinder or cylinders, whilst in many cases
adjustable by hand, not being acted on by the governor. With our improved system
of compound engines worked with steam from compound boilers there is com-
paratively large supply of steam available for working the second-stage or later-stage
cylinder or cylinders; and when a variation takes place in the quantity of steam
admitted to the high-pressure cylinder or cylinders a corresponding variation does not
take place in the steam admitted to the other cylinders if only the valve or valves of
the high-pressure cylinder or cylinders are controlled by the governor. The control-
ling action of the ordinary governor arrangement is consequently insufficient, or not
well distributed throughout the several cylinders; and to remedy this defect we by
our present Invention apply to the second-stage cylinder or cylinders, and to later-
stage cylinders, if there are any, valves and valve gear arranged to be automatically
controlled by a speed governor in the same manner as are those of the high-pressure
cylinder or cylinders. In such governor-controlled valve gear we apply any suitable
adjusting devices for regulating the relative proportional extents of the action of the
governor on the valves of the several cylinders as may be found to work best in
practice.
Our improvements may be practically carried out with various kinds of governors
and valve gear and no one having a knowledge of existing governors and valve
gear will have any difficulty in applying our Invention as hereinbefore described;
and what we show on an accompanying sheet of explanatory drawings is merely an
example and one of many ways of carrying out our Invention which may be adopted.
Figure, 1, on the sheet of drawings is a side elevation, figure, 2, is a plan, and
figure, 3, is a sectional elevation of some details viewed as at right angles to figure, 1.
In these drawings, which are little more than outline diagrams without various well
known details, the same reference numerals are used to mark the same or like parts
wherever they are repeated.
The drawings show two cylinders, 4, 5, of a compound horizontal steam engine,
with the high-pressure cylinder, 4, tandem or in line with the low pressure cylinder, 5.

page_text: Both cylinders are arranged for Corliss valves, those of the high-pressure cylinder, 4,
being assumed to be worked by means of a wrist plate as in some modifications of
Corliss valve gear. The releasing mechanism, 6, is shown as connected to a bell-
crank lever, 7, which is connected by a rod, 8, to a bellcrank lever, 9, connected to
the speed governor, 10).
The valve gear of the low-pressure cylinder, 5, is so far as shown, of the kind
described in our Patent Specification No. 2933 of 1881. The triggers, 28, for
effecting the release or cut-off action of the admission valves, are connected by
rods, 31, to a lever piece, 32, 33, which are loose on a regulating shaft, 34, and are
made to vibrate by eccentrics, 11, on a continuously rotating valve shaft, 12. The
regulating shaft, 34, is made with eccentric end journals, and has fixed on it a
lever, 13, connected by a link, 14, to another lever, 15, which is connected by a
link, 16, to a lever, 17, fast on the same spindle or journal as the bellcrank lever, 9,
herein before described as connected to the speed governor, 10. The link, 14, is made
in two parts connected by a coupling with right and left screw threads, and is thus
made adjustable to allow of the valve gear of the low-pressure cylinder, 5, being
adjusted in relation to that of the high-pressure cylinder, 4.
With the improved arrangements herein before described, when the period of
admission to the second-stage, or later-stage cylinder is by the governor action
diminished or increased (as well as that to the high-pressure cylinder or cylinders) in
consequence of a change of load which may be temporary, there results an increase
or diminution respectively, of the store of steam in the intermediate or low-pressure
boiler, which acts advantageously when the governor next alters the period of
admission in the opposite direction, and renders the governing action better than
when applied to the high-pressure cylinder or cylinders only. And as the initial
pressures in the several cylinders do not materially vary the strains are always main-
tained in the saine relations to each other.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that what wo
claim is :-
In compound steam engines worked with compound boilers, connecting the valve
gear of the second-stage or later-stage cylinder or cylinders with a speed governor
as well as the valve gear of the high-pressure cylinder or cylinders, substantially as
and for the purposes herein before described.
Dated this twenty-ninth day of March 1889.
EDMUND HUNT,
Applicants' Agent.