An Improved Engine Governor
Year: 1897

page_text: Date of Application, 27th July, 1897--Accepted, 11th Dec., 1897
COMPLETE SPECIFICATION.
"An Improved Engine Governor."
I, ANDREW SIMPSON WYLIE of 26 Ardgour Street, Parkhead, in the County of
the City of Glasgow, Engineer, 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.-
The invention consists of an air-tight chamber of box configuration containing
a pair of cylinders provided with pistons and piston rods. The latter work through
the casing with the usual stuffing box and gland fittings.
The medium for controlling the governor and maintaining the engine at a
uniform or more or less constant rate of speed is a liquid such as water or oil-
and the apparatus is so arranged that when the engine is working at a normal
rate of speed this medium is injected into the cylindens in a much less quantity
without exerting any appreciable action on the rod which operates the throttle
valve of the engine. But when racing of the engine takes place the rod is acted
upon so effectively that the steam is almost entirely cut off from the slide valve
wing to the incompressibility of the liquid contained within the cylinders
between the two pair of pistons. The said chamber (which is formed of metal)
is filled or partly filled with this liquid, which is pumped or drawn into the
cylinders by the pistons through suitable ports or passages.
In order that my said invention may be readily understood and easily carried
into effect, I will now proceed to describe the drawing hereunto annexed.
Figure 1 is a longitudinal section, and Figure 2, is a transverse section of a
governor embodying my invention.
The two cylinders marked A, and B, respectively are provided with two sets of
pistons C, D, E, F. The lower set D, and F, are attached to the piston rods G, G,
and are pivotally mounted on a rocking bar or lever H, which receives its motion
from the valve spindle or other movable part of the engine not shewn on the
drawings. The rocking bar H, being pivoted to the arm H', which depends from
the framework of the vessel or chamber, it will, therefore, be understood from
Figure 1, which illustrates the mid stroke position, that whilst the piston D, is
making the up stroke, the piston F, is making the down stroke which corresponds
to the up and down stroke of the engine it is intended to govern. The down stroke
alternately of either the pistons D, and F, will open the ports I, J, of the upper
pistons, C, E, by drawing down the valves K, and L, from their seats, which opera-
tion allows the liquid to escape into the cylinders aforesaid. The lower pistons are
similarly provided with ports and valves as illustrated in the drawings,
So that the liquid also flows in through the ports or passages at
the bottom of the cylinder. The liquid with the return stroke is
forced out from the cylinders by a port or outlet M, formed in the side, or other
part of each cylinder, and as seen in Figure 2. The said port or outlet M, is pro-
vided with a valve, N, capable of being screwed up or down, and which regulates
the quantity of liquid to be discharged from the cylinder in order to determine
the speed of the engine.
In the event of any undue quantity of liquid accumulating in the cylinder

page_text: between the pistons than could be ejected through the discharge outlet M, in
consequence of the nacing of the engine, the rod Q, which is in communication
with the throttle valve (not shewn on the drawings) would be acted upon to such
an extent that the quantity of steam necessary for operating the slide valve, as
previously referred to, would be so diminished as to speedily bring the engine to
its normal working speed. The rod Q is operated by the arms R, and S, keyed
or otherwise rigidly secured to the upper ends of the upper piston rods, which arms
engage the projections T, and U. Instead of the springs O, and P, a dead weight
may be placed on the top of the piston rods. The rod Q, which connects the
governor with the throttle valve may also be connected with a valve on condenser
or condenser connections, so that the same motion which shuts the throttle valve
will also break the vacuum.—
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 I
claim is.
-
In governors of steam or other fluid pressure engines the method and means of
operating these substantially in the manner and for the purposes as hereinbefore
described and shewn in the accompanying sheet of drawings.―
D
' 1 O of Tule 1807
ANDREW SIMPSON WYLIE,
Applicant.