AN IM- PROVED STEAM ENGINE GOVERNOR
Year: 1871

page_text: LETTERS PATENT to Stillman Boyd Allen, of the State of Massachusetts,
of the United States of America, for the Invention of "AN IM-
PROVED STEAM ENGINE GOVERNOR."-A communication from Reuben
Kidder Huntoon, of the State aforesaid.
Sealed the 30th June 1871, and dated the 9th May 1871.
COMPLETE SPECIFICATION filed by the said Stillman Boyd Allen at
the Office of the Commissioners of Patents, with his Petition and
Declaration, on the 9th May 1871, pursuant to the 9th Section
of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS MAY COME, I, STILLMAN
BOYD ALLEN, of the State of Massachusetts, of the United States of
America, send greeting.
WHEREAS I am in possession of an Invention of "AN IMPROVED
STEAM ENGINE GOVERNOR," (such Invention having been communicated
to me by Reuben Kidder Huntoon, of the State aforesaid) and have
petitioned Her Majesty to grant unto me, and my executors, adminis-
trators, and assigns, Her Royal Letters Patent for the same.

page_text: NOW KNOW YE, that I, the said Stillman Boyd Allen, 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 it is to be performed, reference being had to the
accompanying Drawings, making part of this Specification :-
The nature of the said Invention consists in an improved steam
engine governor, as composed of a paddle wheel or rotary series of
paddles, two separate shafts, and a rotary closed case, and a series of
ribs or wings projected from the inner periphery of such case, all
being arranged so as to operate substantially in manner as herein-after
explained.
The nature of the said Invention further consists in the combination
of a scroll or fusee and a weight suspended from the periphery thereof
with the steam engine governor as described, and the valve case, valve
or valves thereof, and the operative mechanism of the latter, all being
essentially as herein-after specified.
The nature of the said Invention further consists in an arm and
shaft as arranged and combined with the balanced valve stem of the
valve case, and its induct as explained. Of the said Drawing Figure
1 is a front elevation; Figure 2, a vertical and longitudinal section;
Figure 3, a transverse section; and Figure 4, a side view of one of my
improved governors.
In such Drawings A denotes a cylindrical drum provided on its inner
periphery with a series of flanges or ribs a, a, arranged at or about at
equal distances apart. This drum is mounted on and so as to turn on a
shaft b, there being another shaft c, to which the drum is fixed or
fastened. The said shaft b extends into the drum from one head d
thereof, the shaft c being extended from the other head e of the drum
as shown. To the shaft b, and within the drum, a series of paddle or
flat wings 9, 9, is fastened, each of such paddles or wings being made
to radiate from the shaft in manner as shown in Figure 3. The two
shafts are supported in bearings h, h, in a standard B, erected on a valve
case C, all being as shown. On the shaft c there is fixed a volute scroll
or fusee D having a chain or rope / fastened at one end to its periphery
and extended partially around such and to a weight or series 1 of
weights applied to the lower end or part of such chain or rope. A small
gear wheel or pinion m fixed on the shaft c engages with a toothed
sector fixed on a shaft o that enters one head of the valve case C

page_text: through a stuffing box p, and passes into the induct E. An arm q, carry-
ing a friction wheel ", projects from that part of the shaft o which
is within the induct E of the valve case and enters a slot or
passage made in the shanks that connects two valves t, u. The
said valves are arranged in manner as slŕown with ports or openings v, v,
made in the opposite sides of the tubular induct E, projected within
the case C, the said induct being closed at its inner end. An educt
F leads out of the lower part of the case C. If we suppose a driving
belt from a pulley or drum on a shaft of a steam engine to run upon
a pulley or wheel w, fixed on the shaft b, the series of paddles or floats
g will be put in revolution within the case A. Such case is to be filled
or supplied with water or a fluid which by the action of the paddles
or floats will be put in revolution and thrown against the flanges or
ribs a of the case A, thereby causing the said case to revolve in the
same direction. As a consequence the pinion m will be revolved so as
to put the toothed sector n in movement, so as to turn the shaft o
and thereby effect a movement of the valves or what may be termed
the "double balanced valve" of the induct E of the valve case C.
The rotary movement of the case A will be resisted by the weight
suspended from the scroll or fusee D, which as it revolves will increase
the leverage of the weight on the shaft of the case. An arm projecting
from the shaft c, and provided with an adjustable weight is not so effective
as the scroll or fusce with its line and weight, for with the former the
effect of the weight is diminished as the arm moves out of a horizontal
position, but with the fusee or scroll the effect or resistance of the weight
constantly increases as its rope is wound up by the scroll or fusee.
Thus it will be seen that with the scroll or fusce there is an element in
action not incident to the arm and weight as ordinarily used, such
clement and the functions performed by it being specially useful or
advantageous with the governor and other mechanism as described.
By having the valves operated by the arm q applied to their con-
nections there will be no pressure on the valves such as would result
were their stem extended through a stuffing box and out of the case C.
Consequently the compound valve becomes a "balanced valve" easily
put in operation by the governor.
Applying the fusee or scroll with its suspended weight directly to the
shaft c is far preferable to applying it or an arm and adjustable weight
thereon to the shaft o, for in the latter case the weight has to be very

page_text: materially increased to produce the necessary.result, as it has to operate
through the sectoral levia andits, pinion, and consequently has all the
leverage of such to overcome in order to move the case A.
I claim the improved governor as composed of the paddle wheel or
rotary series of paddles g, the separate shafts b, c, and the rotary closed 5
casc A. and its series of ribs or wings a, all arranged and applied together
substantially in manner and so as to operate as described.
I also claim the combination of the scroll or fusce D and weight/
suspended therefrom as set forth, with the engine governor as described,
the valve case C, valve or valves thereof, and the operative mechanism 1
of the latter, all being substantially as specified.
I also claim the arm q and shaft o as arranged and combined with
the valve stem s, the case C, and the induct E thercof, substantially as
explained.
In witness whereof I have hereto set my signature and seal, this 1
STILLMAN BOYD ALLEN. (L.S.)