IMPROVED EXHAUST REGULATING APPARATUS FOR OBTAINING A CONTINUOUS BLAST AND INCREASING THE DRAFT IN LOCOMOTIVE AND OTHER ENGINES.
Year: 1874

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane;
in the County of Middlesex, Patent Agent, for the Invention of
"IMPROVED EXHAUST REGULATING APPARATUS FOR OBTAINING A CONTINUOUS
BLAST AND INCREASING THE DRAFT IN LOCOMOTIVE AND OTHER ENGINES.".
A communication from abroad by Charles Currie Gregory, of
Fredericton, in the Province of New Brunswick.
Sealed the 10th November 1874, and dated the 23rd September 1874.
COMPLETE SPECIFICATION filed by the said Alexander Melville Clark
at the Office of the Commissioners of Patents, with his Petition
and Declaration, on the 23rd September 1874, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXANDER
MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent, send greeting.
:

page_text: {
THE DRAFT IN LOCOMOTIVE AND OTHER ENGINES," and have petitioned Her
Majesty to grant unto me, my executors, administrators, and assigns,
Her Royal Letters Patent for the same, and have made solemn Declara-
tion that it has been communicated to me from abroad by Charles Curric
Gregory, of Fredericton, in the Province of New Brunswick.
NOW KNOW YE, that I, the said Alexander Melville Clark, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention,
and in what manner the same is to be performed in and by the
following statement, reference being had to the accompanying Sheet
of Drawings, and to the letters and figures marked thereon (that is to
say) :-
This Invention consists of an expanding pressure regulating apparatus
as a weighted or spring pressed piston in a cylinder or bellows or other
like contrivance combined with the exhaust of a locomotive or other
engine to receive the steam before it escapes through the nozzle by
which it is discharged into the smoke pipe for increasing the draft of
the furnace, the object being to convert the intermittent violent puffs.
into a continuous blast by which the draft will be stronger in the
aggregate besides being uniform, and will make stronger fires without
as much waste of fuel, and the engine will be relieved of much back
pressure due to forcing the exhaust through the contracted nozzle in
short puffs.
The Invention also consists of an automatic valve at the nozzle of
the exhaust pipe, in combination with the exhaust and the regulating
apparatus to increase the opening when the pressure is greatest, and
gradually close it as the pressure decreases as a further means of effecting
a uniform blast.
The Invention also consists of an automatic relief valve in combina-
tion with the regulator to allow a direct escape of the steam without
passing through the smoke pipe in case of an excess of pressure above
the range or control of the regulating apparatus.
In the accompanying Drawings Figure 1 is a sectional elevation of
the improved exhaust regulators taken on the line x, x, of Figure 3;
Figure 2 is a side elevation; Figure 3 is a plan view with a part in
horizontal section; and Figure 4 is a detail view of the relief valve.
Similar letters of reference indicate corresponding parts.

page_text: A is a steami cylinder open at the top and containing a piston B which
is pressed down by a spring C, the tension of which may be varied by.
an adjusting device if required; D is the exhaast pipe of the engine
discharging into the cylinder under the piston; E is the pipe discharging
the steam from under the piston into the smoke pipe F of a locomotive
boiler G for increasing the draft; I is a slide valve in the pipe E near
the mouth, the stem of which has the curved bar I attached to the
piston rod J passing through a slot in it, the said curved rod being so
shaped that when the piston is raised against the spring and the
> pressure is greatest the valve will be drawn out and the exbaust
opening increased, and when the piston falls as the pressure diminishes
it will close the valve; K is a direct escape pipe for the steam when
there is an excess of pressure; it contains a relief valve L which is to be
opened when the piston rises to a certain height, to let off the excess.
5 It is a rotary valve, and is operated by the toothed bar M gearing with
the valve spindle, the rod being lifted by a block O on a rod P attached
to the piston B acting on arm Q when the piston arrives at such height
as to make it necessary to afford relief to the regulator.
The block O may be shifted up or down on the rod P at will to open
) the relief sooner or later, according to the pressure wanted.
Having described the nature of the Invention, and the manner of
performing the same, I declare that what I claim as new and desire to
secure by Letters Patent is,-
1st. The combination of an expansion receiver and pressure regulator
5 with the exhaust of a locomotive or other engine to effect a continuous
blast for increasing the draft of the furnace, substantially as specified.
)
2ndly. The combination of an automatic regulating valve with the
exhaust valve of a locomotive or other engine to effect a continuous blast
for increasing the draft of the furnace, substantially as specified.
3rdly. The combination of an expansion receiver, and pressure regu.
lator, and a regulating valve with the exhaust of a locomotive or othe
engine for increasing the draft of the furnace, substantially as specified.
4thly. The combination of the relief valve with the expansion receiver
and pressure regulator, substantially as specified.
5thly. The curved bar I combined with the piston of the expansion

page_text: receiver and the stems of the regulating valves, substantially as
specified.
6thly. The adjustable block O, rod P, and toothed bar M, combined
with the piston B and relief valve L, substantially as specified.
In witness whereof, I, the said Alexander Melville Clark, have here- 5
unto set my hand and seal, this Twenty-third day of September,
in the year of our Lord One thousand eight hundred and seventy-
four.
Witness,
HENRY SWALES,
53, Chancery Lanc,
London.
A. M. CLARK. (L.S.)