IMPROVEMENTS IN THE MEANS AND APPARATUS FOR REGULATING THE SUPPLY OF STEAM TO STEAM ENGINES
Year: 1877

page_text: LETTERS PATENT to John Edward Campbell Koch, of No. 20, Queensbury
Place, South Kensington, in the County of Middlesex, Gentleman, and
Frederick William Durham, of Clevedon Villa, Station Road, New Barnet, in
the County of Herts, Engineer, for the Invention of "IMPROVEMENTS IN THE
MEANS AND APPARATUS FOR REGULATING THE SUPPLY OF STEAM TO STEAM
ENGINES"
Sealed the 11th May 1877, and dated the 27th February 1877.
PROVISIONAL SPECIFICATION left by the said John Edward Campbell Koch
and Frederick William Durham at the Office of the Commissioners of Patents
on the 27th February 1877.
JOHN EDWARD CAMPBELL KOCH, of No. 20, Queensbury Place, South Kensington,
in the County of Middlesex, Gentleman, and FREDERICK WILLIAM DURHAM, of
Clevedon Villa, Station Road, New Barnet, in the County of Herts, Engineer.
"IMPROVEMENTS IN THE MEANS AND APPARATUS FOR REGULATING THE SUPPLY
OF STEAM TO STEAM ENGINES."
In large steam engines it frequently requires such considerable power to move the
throttle or other valve in the steam supply pipe in order to regulate the power of
the engine that a governor cannot either be employed at all for the purpose, or it
requires to be so powerful that it is not sufficiently sensitive to act efficiently under
slight variations in speed. Our present Invention has reference to means whereby
we are enabled readily to effect the regulation of the steam supply in cases such as
are above mentioned by means of a small and sensitive governor. For this purpose,
instead of connecting the governor directly to the throttle or other valve, we cause
it to act upon the slide or other valve of a small steam or hydraulic cylinder, the
piston or plunger of which is connected to the supply valve of the steam pipe,
which may either be a throttle valve or may be a simple shut-off valve, which can
be balanced by making the steam or hydranlic piston or plunger that acts on it of
suitable area. We prefer to give the slide or valve of the steam or hydraulic
cylinder a differential action by any of the known arrangements employed for that
purpose, whereby the piston or plunger is brought to rest at any part of its stroke;
for example, we work the slide or valve from a point near the middle of a lever,

page_text: one end of which is connected to the governor and the other end to the steam or
hydraulic piston or plunger, the parts being so arranged that when the governor by
acting on the one end of the lever tends to open the admission passage, and thereby
to make the piston or plunger advance, this advance movement acting on the other
end of the lever tends to close the admission passage, and so to retain the piston or
plunger in the position to which it has been moved.
The governor employed, as above described, to work the slide or valve of the
steam or hydraulic cylinder may be of any known kind, such as the various forms
of centrifugal governor or a governor of the kind described in the Specon. to Letters
Patent, granted to F. W. Durham and H. Howse, on the 19th May 1876, No. 2128,
in which governor the resistance of water or liquid to the vanes of a fan revolving
therein is applied through differential gearing to act on a regulating spindle. In
employing such a governor in combination with a steam or hydraulic cylinder for
working a throttle or stop-valve, we connect the said regulating spindle to the slide
or valve of the steam or hydraulic cylinder by a rack and pinion or pulley and
chain, or we work the slide or valve from the spindle by means of a crank, eccentric,
or cam, and we apply a volute spring to the spindle, or a helical spring to a chain or
belt attached to a pulley on the spindle, or to the slide or valve rod, making tho
spring adjustable, so that its force can be suited to any desired working speed of
the engine, and consequently that speed can be determined by proper adjustment of
the spring in relation to the resistance of the liquid,
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Edward Campbell Koch and Frederick William Durham in the
Great Seal Patent Office on the 25th August 1877.
JOHN EDWARD CAMPBELL KOCH, of No. 20, Queensbury Place, South Kensington,
in the County of Middlesex, Gentleman, and FREDERICK WILLIAM DURHAM, of
Clevedon Villa, Station Road, New Barnet, in the County of Herts, Engineer,
IMPROVEMENTS IN THE MEANS AND APPARATUS FOR REGULATING THE SUPPLY
OF STEAM TO STEAM ENGINES."
"
In large steam engines it frequently requires such considerable power to move the
throttle or other valve in the steam supply pipe in order to regulate the power of
the engine that a governor cannot either be employed at all for the purpose, or it
requires to be so powerful that it is not sufficiently sensitive to act efficiently under
slight variations in speed. Our present Invention has reference to means whereby
we are enabled readily to effect the regulation of the steam supply in cases such as
are above mentioned by means of a small and sensitive governor. For this purpose
instead of connecting the governor directly to the throttle or other valve, we cause
it to act upon the slide or other valve of a small steam or hydraulic cylinder, the
piston or plunger of which is connected to the supply valve of the steam pipe,
which may either be a throttle valve, or may be a simple shut-off valve which can
be balanced by making the steam or hydraulic piston or plunger that acts on it of
suitable area. We prefer to give the slide or valve of the steam or hydraulic
cylinder a differential action by any of the known arrangements employed for that
purpose, whereby the piston or plunger is brought to rest at any part of its stroke;
for example, we work the slide or valve from a point near the middle of a lever,
one end of which is connected to the governor and the other end to the steam or
hydraulic piston or plunger, the parts being so arranged that when the governor by
acting on the one end of the lever tends to open the admission passage, and thereby
to make the piston or plunger advance; this advance movement acting on the other
end of the lever tends to close the admission passage, and so to retain the piston or
plunger in the position to which it has been moved.
The governor employed, as above described, to work the slide or valve of the

page_text: engine, and consequently that speed can be determined by proper adjustment of the
spring in relation to the resistance of the liquid.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a perspective view of a governor of the kind described in Durham
& Howse's Specon., above referred to, applied according to our Invention to work a
throttle valve, and Fig. 2 is a section of the modified form in which we apply a
governor to work a stop or shut-off valve.
Referring to Fig. 1, the arm A. of the governor which is employed to adjust and
indicate speed, has on it a pin a linked to the slide of a subsidiary steam, hydraulic,
or other fluid pressure cylinder B, the piston rod 6 of which is linked to a lever arm c
on the spindle of a throttle valve in the steam pipe C. According as the speed of the
engine to which the apparatus applied varies, the arm A is moved by the
differential gearing of the governor, and the slide of the cylinder B being thereby
shifted so as to subject the piston of that cylinder to fluid pressure on the one side
or the other; the said piston is moved and the throttle valve connected to it is partly
turned so as to check more or less the flow of steam through the pipe C. Instead
of employing a throttle valve, a stop or shut-off valve may be worked in this
manner, as shewn in Fig. 2. Here B is the subsidiary cylinder, the slide jacket of
which is connected by a pipe d with the main steam pipe C. In this pipe there is
a stop valve c connected by the rod 6 to the piston of the cylinder B, the slide of
which is worked by connecting its rod a to a moving arm of the governor. The
piston of B is made somewhat greater in its area than the valve c, so that when
steam is admitted by the slide above the piston, its pressure thereon suffices to close
the valve. As this pressure is more or less relieved by the movement of the slide in
obedience to the governor, permitting the escape of more or less steam by an exhaust
port x, so the valve c becomes more or less opened, giving passage for a larger or
smaller quantity of steam to supply the engine.
Having thus described the nature of our Invention, and in what manner the same
is to be performed, we claim, working the throttle or other regulating valve in the
steam pipe of an engine by a piston acted on by fluid pressure in a cylinder, the
admission of fluid to the said cylinder and its emission therefrom being regulated
by a slide worked by a governor, substantially as and for the purposes herein set
forth.
In witness whereof, I, the said Frederick William Durham, have hereunto set
my hand and seal, this Twenty-fourth day of August, in the year of our
Lord One thousand eight hundred and seventy-seven.

page_text: Filed 19th June 1880.
In the Matter of a Patent granted to JOHN EDWARD CAMPBELL KOCH, of
No. 20, Queensbury Place, South Kensington, in the County of
Middlesex, Gentleman, and FREDERICK WILLIAM DURHAM, of Clevedon
Villa, Station Road, New Barnet, in the County of Herts, Engineer, for
the Invention of IMPROVEMENTS IN THE MEANS AND APPARATUS FOR
REGULATING THE SUPPLY OF STEAM TO STEAM ENGINES," bearing date the
Twenty seventh day of February, One thousand eight hundred and
seventy seven, No. 788.
86
DISCLAIMER proposed to be entered by the said John Edward Campbell Koch
and Frederick William Durham as such patentees as aforesaid, pursuant to the
Statutes in that case made and provided.
WHEREAS we have been advised that certain claims made in the Specification
of the said Letters Patent are of doubtful validity, and whereas the subject matter
of these claims is not of great importance, and we do not wish to retain any claim
in respect of the same.
We therefore, for these reasons desire to disclaim, and we do hereby disclaim from
the Specification by inserting after the word "governor," on page 2 line 36 of the
Specification as it is printed by Her Majesty's printer the words "of the kind herein-
after mentioned," also by substituting the word "is" for the words "may be of any
known kind, such as the various forms of centrifugal governor or a governor," on
lines 1 and 2 of page 3. Also by inserting after the word "performed," in the
claiming clause at page 3, line 41, the words "it is to be noted that no claim is made to
the use of governors generally for the purpose above referred to, but," and by inserting
after the word "governor" at line 44 of the same page the words "of the kind above
mentioned and described in the Specification of Durham and Howse as above stated."
And in order that the effect of this Disclaimer may be better understood we
annex a copy of the Specification as it will appear when such Disclaimer has been
made as aforesaid.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said John Edward Campbell Koch and Frederick William Durham in the
Great Seal Patent Office on the Twenty fifth August, One thousand eight
hundred and seventy seven.
JOHN EDWARD CAMPBELL KOCH, of No. 20, Queensbury Place, South Kensington,
in the County of Middlesex, Gentleman, and FREDERICK WILLIAM DURHAM, of
Clevedon Villa, Station Road, New Barnet, in the County of Herts, Engineer.
"IMPROVEMENTS IN THE MEANS AND APPARATUS FOR REGULATING THE SUPPLY OF
STEAM TO STEAM ENGINES."
LIA NATA to move the

page_text: of the cylinder B, the slide of which is worked by connecting its rod a to a moving
arm of the governor. The piston of B is made somewhat greater in its area
than the valve c, so that when steam is admitted by the slide above the piston
its pressure thereon suffices to close the valve. As this pressure is more or less
relieved by the movement of the slide in obedience to the governor permitting the
escape of more or less steam by an exhaust port x, so the valve c becomes more or
less opened, giving passage for a larger or smaller quantity of steam to supply the
engine.
Having thus described the nature of our Invention, and in what manner the
same is to be performed, it is to be noted that no claim is made to the use of
governors generally for the purpose above referred to, but we claim, working the
throttle or other regulating valve in the steam pipe of an engine by a piston
acted on by fluid pressure in a cylinder, the admission of fluid to the said cylinder
and its emission therefrom being regulated by a slide worked by a governor of the
kind above mentioned and described in the Specification of Durham & Howse as
above stated, substantially as and for the purposes herein set forth.
In witness whereof, I, the said Frederick William Durham, have hereunto set
my hand and seal, this Eighteenth day of May, in the year of our Lord,
One thousand eight hundred and eighty.
Signed, sealed, and delivered by
the above named Frederick
William Durham in the
presence of
HENRY LATTEY,
Clerk to Messrs. Lattey & Hart, Solrs.,
Of No. 16, Devonshire Square,
Bishopsgate Street,
FRED³. W. DURHAM. (L.S.)
In the City of London.
I hereby grant my fiat, giving leave to the above named John Edward Campbell
Koch and Frederick William Durham to file in the Great Seal Patent Office, with
the Specification to which the same relates, the above written Disclaimer and
Memorandum of Alteration.
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